Commit 38a9a621 authored by James Bottomley's avatar James Bottomley

Merge HEAD from ../scsi-misc-2.6-old

parents 27d1097d e75d5176
...@@ -229,7 +229,7 @@ config SCSI_FC_ATTRS ...@@ -229,7 +229,7 @@ config SCSI_FC_ATTRS
config SCSI_ISCSI_ATTRS config SCSI_ISCSI_ATTRS
tristate "iSCSI Transport Attributes" tristate "iSCSI Transport Attributes"
depends on SCSI depends on SCSI && NET
help help
If you wish to export transport-specific information about If you wish to export transport-specific information about
each attached iSCSI device to sysfs, say Y. each attached iSCSI device to sysfs, say Y.
...@@ -247,6 +247,30 @@ endmenu ...@@ -247,6 +247,30 @@ endmenu
menu "SCSI low-level drivers" menu "SCSI low-level drivers"
depends on SCSI!=n depends on SCSI!=n
config ISCSI_TCP
tristate "iSCSI Initiator over TCP/IP"
depends on SCSI && INET
select CRYPTO
select CRYPTO_MD5
select CRYPTO_CRC32C
select SCSI_ISCSI_ATTRS
help
The iSCSI Driver provides a host with the ability to access storage
through an IP network. The driver uses the iSCSI protocol to transport
SCSI requests and responses over a TCP/IP network between the host
(the "initiator") and "targets". Architecturally, the iSCSI driver
combines with the host's TCP/IP stack, network drivers, and Network
Interface Card (NIC) to provide the same functions as a SCSI or a
Fibre Channel (FC) adapter driver with a Host Bus Adapter (HBA).
To compile this driver as a module, choose M here: the
module will be called iscsi_tcp.
The userspace component needed to initialize the driver, documentation,
and sample configuration files can be found here:
http://linux-iscsi.sf.net
config SGIWD93_SCSI config SGIWD93_SCSI
tristate "SGI WD93C93 SCSI Driver" tristate "SGI WD93C93 SCSI Driver"
depends on SGI_IP22 && SCSI depends on SGI_IP22 && SCSI
......
...@@ -33,6 +33,7 @@ obj-$(CONFIG_SCSI_FC_ATTRS) += scsi_transport_fc.o ...@@ -33,6 +33,7 @@ obj-$(CONFIG_SCSI_FC_ATTRS) += scsi_transport_fc.o
obj-$(CONFIG_SCSI_ISCSI_ATTRS) += scsi_transport_iscsi.o obj-$(CONFIG_SCSI_ISCSI_ATTRS) += scsi_transport_iscsi.o
obj-$(CONFIG_SCSI_SAS_ATTRS) += scsi_transport_sas.o obj-$(CONFIG_SCSI_SAS_ATTRS) += scsi_transport_sas.o
obj-$(CONFIG_ISCSI_TCP) += iscsi_tcp.o
obj-$(CONFIG_SCSI_AMIGA7XX) += amiga7xx.o 53c7xx.o obj-$(CONFIG_SCSI_AMIGA7XX) += amiga7xx.o 53c7xx.o
obj-$(CONFIG_A3000_SCSI) += a3000.o wd33c93.o obj-$(CONFIG_A3000_SCSI) += a3000.o wd33c93.o
obj-$(CONFIG_A2091_SCSI) += a2091.o wd33c93.o obj-$(CONFIG_A2091_SCSI) += a2091.o wd33c93.o
......
...@@ -608,17 +608,43 @@ static char *container_types[] = { ...@@ -608,17 +608,43 @@ static char *container_types[] = {
* files instead of in OS dependant driver source. * files instead of in OS dependant driver source.
*/ */
static void setinqstr(int devtype, void *data, int tindex) static void setinqstr(struct aac_dev *dev, void *data, int tindex)
{ {
struct scsi_inq *str; struct scsi_inq *str;
struct aac_driver_ident *mp;
mp = aac_get_driver_ident(devtype);
str = (struct scsi_inq *)(data); /* cast data to scsi inq block */ str = (struct scsi_inq *)(data); /* cast data to scsi inq block */
memset(str, ' ', sizeof(*str));
inqstrcpy (mp->vname, str->vid);
inqstrcpy (mp->model, str->pid); /* last six chars reserved for vol type */ if (dev->supplement_adapter_info.AdapterTypeText[0]) {
char * cp = dev->supplement_adapter_info.AdapterTypeText;
int c = sizeof(str->vid);
while (*cp && *cp != ' ' && --c)
++cp;
c = *cp;
*cp = '\0';
inqstrcpy (dev->supplement_adapter_info.AdapterTypeText,
str->vid);
*cp = c;
while (*cp && *cp != ' ')
++cp;
while (*cp == ' ')
++cp;
/* last six chars reserved for vol type */
c = 0;
if (strlen(cp) > sizeof(str->pid)) {
c = cp[sizeof(str->pid)];
cp[sizeof(str->pid)] = '\0';
}
inqstrcpy (cp, str->pid);
if (c)
cp[sizeof(str->pid)] = c;
} else {
struct aac_driver_ident *mp = aac_get_driver_ident(dev->cardtype);
inqstrcpy (mp->vname, str->vid);
/* last six chars reserved for vol type */
inqstrcpy (mp->model, str->pid);
}
if (tindex < (sizeof(container_types)/sizeof(char *))){ if (tindex < (sizeof(container_types)/sizeof(char *))){
char *findit = str->pid; char *findit = str->pid;
...@@ -627,7 +653,9 @@ static void setinqstr(int devtype, void *data, int tindex) ...@@ -627,7 +653,9 @@ static void setinqstr(int devtype, void *data, int tindex)
/* RAID is superfluous in the context of a RAID device */ /* RAID is superfluous in the context of a RAID device */
if (memcmp(findit-4, "RAID", 4) == 0) if (memcmp(findit-4, "RAID", 4) == 0)
*(findit -= 4) = ' '; *(findit -= 4) = ' ';
inqstrcpy (container_types[tindex], findit + 1); if (((findit - str->pid) + strlen(container_types[tindex]))
< (sizeof(str->pid) + sizeof(str->prl)))
inqstrcpy (container_types[tindex], findit + 1);
} }
inqstrcpy ("V1.0", str->prl); inqstrcpy ("V1.0", str->prl);
} }
...@@ -822,12 +850,12 @@ int aac_get_adapter_info(struct aac_dev* dev) ...@@ -822,12 +850,12 @@ int aac_get_adapter_info(struct aac_dev* dev)
dev->dac_support = (dacmode!=0); dev->dac_support = (dacmode!=0);
} }
if(dev->dac_support != 0) { if(dev->dac_support != 0) {
if (!pci_set_dma_mask(dev->pdev, 0xFFFFFFFFFFFFFFFFULL) && if (!pci_set_dma_mask(dev->pdev, DMA_64BIT_MASK) &&
!pci_set_consistent_dma_mask(dev->pdev, 0xFFFFFFFFFFFFFFFFULL)) { !pci_set_consistent_dma_mask(dev->pdev, DMA_64BIT_MASK)) {
printk(KERN_INFO"%s%d: 64 Bit DAC enabled\n", printk(KERN_INFO"%s%d: 64 Bit DAC enabled\n",
dev->name, dev->id); dev->name, dev->id);
} else if (!pci_set_dma_mask(dev->pdev, 0xFFFFFFFFULL) && } else if (!pci_set_dma_mask(dev->pdev, DMA_32BIT_MASK) &&
!pci_set_consistent_dma_mask(dev->pdev, 0xFFFFFFFFULL)) { !pci_set_consistent_dma_mask(dev->pdev, DMA_32BIT_MASK)) {
printk(KERN_INFO"%s%d: DMA mask set failed, 64 Bit DAC disabled\n", printk(KERN_INFO"%s%d: DMA mask set failed, 64 Bit DAC disabled\n",
dev->name, dev->id); dev->name, dev->id);
dev->dac_support = 0; dev->dac_support = 0;
...@@ -1438,7 +1466,6 @@ int aac_scsi_cmd(struct scsi_cmnd * scsicmd) ...@@ -1438,7 +1466,6 @@ int aac_scsi_cmd(struct scsi_cmnd * scsicmd)
struct Scsi_Host *host = scsicmd->device->host; struct Scsi_Host *host = scsicmd->device->host;
struct aac_dev *dev = (struct aac_dev *)host->hostdata; struct aac_dev *dev = (struct aac_dev *)host->hostdata;
struct fsa_dev_info *fsa_dev_ptr = dev->fsa_dev; struct fsa_dev_info *fsa_dev_ptr = dev->fsa_dev;
int cardtype = dev->cardtype;
int ret; int ret;
/* /*
...@@ -1542,14 +1569,14 @@ int aac_scsi_cmd(struct scsi_cmnd * scsicmd) ...@@ -1542,14 +1569,14 @@ int aac_scsi_cmd(struct scsi_cmnd * scsicmd)
* see: <vendor>.c i.e. aac.c * see: <vendor>.c i.e. aac.c
*/ */
if (scsicmd->device->id == host->this_id) { if (scsicmd->device->id == host->this_id) {
setinqstr(cardtype, (void *) (inq_data.inqd_vid), (sizeof(container_types)/sizeof(char *))); setinqstr(dev, (void *) (inq_data.inqd_vid), (sizeof(container_types)/sizeof(char *)));
inq_data.inqd_pdt = INQD_PDT_PROC; /* Processor device */ inq_data.inqd_pdt = INQD_PDT_PROC; /* Processor device */
aac_internal_transfer(scsicmd, &inq_data, 0, sizeof(inq_data)); aac_internal_transfer(scsicmd, &inq_data, 0, sizeof(inq_data));
scsicmd->result = DID_OK << 16 | COMMAND_COMPLETE << 8 | SAM_STAT_GOOD; scsicmd->result = DID_OK << 16 | COMMAND_COMPLETE << 8 | SAM_STAT_GOOD;
scsicmd->scsi_done(scsicmd); scsicmd->scsi_done(scsicmd);
return 0; return 0;
} }
setinqstr(cardtype, (void *) (inq_data.inqd_vid), fsa_dev_ptr[cid].type); setinqstr(dev, (void *) (inq_data.inqd_vid), fsa_dev_ptr[cid].type);
inq_data.inqd_pdt = INQD_PDT_DA; /* Direct/random access device */ inq_data.inqd_pdt = INQD_PDT_DA; /* Direct/random access device */
aac_internal_transfer(scsicmd, &inq_data, 0, sizeof(inq_data)); aac_internal_transfer(scsicmd, &inq_data, 0, sizeof(inq_data));
return aac_get_container_name(scsicmd, cid); return aac_get_container_name(scsicmd, cid);
......
...@@ -1560,7 +1560,7 @@ struct fib_ioctl ...@@ -1560,7 +1560,7 @@ struct fib_ioctl
struct revision struct revision
{ {
__le32 compat; u32 compat;
__le32 version; __le32 version;
__le32 build; __le32 build;
}; };
......
...@@ -408,7 +408,7 @@ static int check_revision(struct aac_dev *dev, void __user *arg) ...@@ -408,7 +408,7 @@ static int check_revision(struct aac_dev *dev, void __user *arg)
char *driver_version = aac_driver_version; char *driver_version = aac_driver_version;
u32 version; u32 version;
response.compat = cpu_to_le32(1); response.compat = 1;
version = (simple_strtol(driver_version, version = (simple_strtol(driver_version,
&driver_version, 10) << 24) | 0x00000400; &driver_version, 10) << 24) | 0x00000400;
version += simple_strtol(driver_version + 1, &driver_version, 10) << 16; version += simple_strtol(driver_version + 1, &driver_version, 10) << 16;
...@@ -574,7 +574,7 @@ static int aac_send_raw_srb(struct aac_dev* dev, void __user * arg) ...@@ -574,7 +574,7 @@ static int aac_send_raw_srb(struct aac_dev* dev, void __user * arg)
rcode = -ENOMEM; rcode = -ENOMEM;
goto cleanup; goto cleanup;
} }
sg_user[i] = (void __user *)usg->sg[i].addr; sg_user[i] = (void __user *)(long)usg->sg[i].addr;
sg_list[i] = p; // save so we can clean up later sg_list[i] = p; // save so we can clean up later
sg_indx = i; sg_indx = i;
...@@ -624,7 +624,7 @@ static int aac_send_raw_srb(struct aac_dev* dev, void __user * arg) ...@@ -624,7 +624,7 @@ static int aac_send_raw_srb(struct aac_dev* dev, void __user * arg)
rcode = -ENOMEM; rcode = -ENOMEM;
goto cleanup; goto cleanup;
} }
sg_user[i] = (void __user *)upsg->sg[i].addr; sg_user[i] = (void __user *)(long)upsg->sg[i].addr;
sg_list[i] = p; // save so we can clean up later sg_list[i] = p; // save so we can clean up later
sg_indx = i; sg_indx = i;
......
...@@ -752,8 +752,8 @@ static int __devinit aac_probe_one(struct pci_dev *pdev, ...@@ -752,8 +752,8 @@ static int __devinit aac_probe_one(struct pci_dev *pdev,
if (error) if (error)
goto out; goto out;
if (pci_set_dma_mask(pdev, 0xFFFFFFFFULL) || if (pci_set_dma_mask(pdev, DMA_32BIT_MASK) ||
pci_set_consistent_dma_mask(pdev, 0xFFFFFFFFULL)) pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK))
goto out; goto out;
/* /*
* If the quirk31 bit is set, the adapter needs adapter * If the quirk31 bit is set, the adapter needs adapter
...@@ -797,9 +797,9 @@ static int __devinit aac_probe_one(struct pci_dev *pdev, ...@@ -797,9 +797,9 @@ static int __devinit aac_probe_one(struct pci_dev *pdev,
* address space. * address space.
*/ */
if (aac_drivers[index].quirks & AAC_QUIRK_31BIT) if (aac_drivers[index].quirks & AAC_QUIRK_31BIT)
if (pci_set_dma_mask(pdev, 0xFFFFFFFFULL)) if (pci_set_dma_mask(pdev, DMA_32BIT_MASK))
goto out_free_fibs; goto out_deinit;
aac->maximum_num_channels = aac_drivers[index].channels; aac->maximum_num_channels = aac_drivers[index].channels;
error = aac_get_adapter_info(aac); error = aac_get_adapter_info(aac);
if (error < 0) if (error < 0)
......
...@@ -976,6 +976,16 @@ static void send_srb(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb) ...@@ -976,6 +976,16 @@ static void send_srb(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb)
} }
} }
static inline void pio_trigger(void)
{
static int feedback_requested;
if (!feedback_requested) {
feedback_requested = 1;
printk(KERN_WARNING "%s: Please, contact <linux-scsi@vger.kernel.org> "
"to help improve support for your system.\n", __FILE__);
}
}
/* Prepare SRB for being sent to Device DCB w/ command *cmd */ /* Prepare SRB for being sent to Device DCB w/ command *cmd */
static void build_srb(struct scsi_cmnd *cmd, struct DeviceCtlBlk *dcb, static void build_srb(struct scsi_cmnd *cmd, struct DeviceCtlBlk *dcb,
...@@ -2320,6 +2330,7 @@ static void data_in_phase0(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb, ...@@ -2320,6 +2330,7 @@ static void data_in_phase0(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb,
CFG2_WIDEFIFO); CFG2_WIDEFIFO);
while (DC395x_read8(acb, TRM_S1040_SCSI_FIFOCNT) != 0x40) { while (DC395x_read8(acb, TRM_S1040_SCSI_FIFOCNT) != 0x40) {
u8 byte = DC395x_read8(acb, TRM_S1040_SCSI_FIFO); u8 byte = DC395x_read8(acb, TRM_S1040_SCSI_FIFO);
pio_trigger();
*(srb->virt_addr)++ = byte; *(srb->virt_addr)++ = byte;
if (debug_enabled(DBG_PIO)) if (debug_enabled(DBG_PIO))
printk(" %02x", byte); printk(" %02x", byte);
...@@ -2331,6 +2342,7 @@ static void data_in_phase0(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb, ...@@ -2331,6 +2342,7 @@ static void data_in_phase0(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb,
/* Read the last byte ... */ /* Read the last byte ... */
if (srb->total_xfer_length > 0) { if (srb->total_xfer_length > 0) {
u8 byte = DC395x_read8(acb, TRM_S1040_SCSI_FIFO); u8 byte = DC395x_read8(acb, TRM_S1040_SCSI_FIFO);
pio_trigger();
*(srb->virt_addr)++ = byte; *(srb->virt_addr)++ = byte;
srb->total_xfer_length--; srb->total_xfer_length--;
if (debug_enabled(DBG_PIO)) if (debug_enabled(DBG_PIO))
...@@ -2507,6 +2519,7 @@ static void data_io_transfer(struct AdapterCtlBlk *acb, ...@@ -2507,6 +2519,7 @@ static void data_io_transfer(struct AdapterCtlBlk *acb,
if (debug_enabled(DBG_PIO)) if (debug_enabled(DBG_PIO))
printk(" %02x", (unsigned char) *(srb->virt_addr)); printk(" %02x", (unsigned char) *(srb->virt_addr));
pio_trigger();
DC395x_write8(acb, TRM_S1040_SCSI_FIFO, DC395x_write8(acb, TRM_S1040_SCSI_FIFO,
*(srb->virt_addr)++); *(srb->virt_addr)++);
......
/*
* iSCSI Initiator over TCP/IP Data-Path
*
* Copyright (C) 2004 Dmitry Yusupov
* Copyright (C) 2004 Alex Aizman
* Copyright (C) 2005 Mike Christie
* maintained by open-iscsi@googlegroups.com
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published
* by the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* See the file COPYING included with this distribution for more details.
*
* Credits:
* Christoph Hellwig
* FUJITA Tomonori
* Arne Redlich
* Zhenyu Wang
*/
#include <linux/types.h>
#include <linux/list.h>
#include <linux/inet.h>
#include <linux/blkdev.h>
#include <linux/crypto.h>
#include <linux/delay.h>
#include <linux/kfifo.h>
#include <linux/scatterlist.h>
#include <net/tcp.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_eh.h>
#include <scsi/scsi_request.h>
#include <scsi/scsi_tcq.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi.h>
#include <scsi/scsi_transport_iscsi.h>
#include "iscsi_tcp.h"
MODULE_AUTHOR("Dmitry Yusupov <dmitry_yus@yahoo.com>, "
"Alex Aizman <itn780@yahoo.com>");
MODULE_DESCRIPTION("iSCSI/TCP data-path");
MODULE_LICENSE("GPL");
MODULE_VERSION("0:4.409");
/* #define DEBUG_TCP */
/* #define DEBUG_SCSI */
#define DEBUG_ASSERT
#ifdef DEBUG_TCP
#define debug_tcp(fmt...) printk(KERN_DEBUG "tcp: " fmt)
#else
#define debug_tcp(fmt...)
#endif
#ifdef DEBUG_SCSI
#define debug_scsi(fmt...) printk(KERN_DEBUG "scsi: " fmt)
#else
#define debug_scsi(fmt...)
#endif
#ifndef DEBUG_ASSERT
#ifdef BUG_ON
#undef BUG_ON
#endif
#define BUG_ON(expr)
#endif
#define INVALID_SN_DELTA 0xffff
static unsigned int iscsi_max_lun = 512;
module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO);
/* global data */
static kmem_cache_t *taskcache;
static inline void
iscsi_buf_init_virt(struct iscsi_buf *ibuf, char *vbuf, int size)
{
sg_init_one(&ibuf->sg, (u8 *)vbuf, size);
ibuf->sent = 0;
}
static inline void
iscsi_buf_init_iov(struct iscsi_buf *ibuf, char *vbuf, int size)
{
ibuf->sg.page = (void*)vbuf;
ibuf->sg.offset = (unsigned int)-1;
ibuf->sg.length = size;
ibuf->sent = 0;
}
static inline void*
iscsi_buf_iov_base(struct iscsi_buf *ibuf)
{
return (char*)ibuf->sg.page + ibuf->sent;
}
static inline void
iscsi_buf_init_sg(struct iscsi_buf *ibuf, struct scatterlist *sg)
{
/*
* Fastpath: sg element fits into single page
*/
if (sg->length + sg->offset <= PAGE_SIZE && page_count(sg->page) >= 2) {
ibuf->sg.page = sg->page;
ibuf->sg.offset = sg->offset;
ibuf->sg.length = sg->length;
} else
iscsi_buf_init_iov(ibuf, page_address(sg->page), sg->length);
ibuf->sent = 0;
}
static inline int
iscsi_buf_left(struct iscsi_buf *ibuf)
{
int rc;
rc = ibuf->sg.length - ibuf->sent;
BUG_ON(rc < 0);
return rc;
}
static inline void
iscsi_hdr_digest(struct iscsi_conn *conn, struct iscsi_buf *buf,
u8* crc)
{
crypto_digest_digest(conn->tx_tfm, &buf->sg, 1, crc);
buf->sg.length += sizeof(uint32_t);
}
static void
iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err)
{
struct iscsi_session *session = conn->session;
unsigned long flags;
spin_lock_irqsave(&session->lock, flags);
if (session->conn_cnt == 1 || session->leadconn == conn)
session->state = ISCSI_STATE_FAILED;
spin_unlock_irqrestore(&session->lock, flags);
set_bit(SUSPEND_BIT, &conn->suspend_tx);
set_bit(SUSPEND_BIT, &conn->suspend_rx);
iscsi_conn_error(iscsi_handle(conn), err);
}
static inline int
iscsi_check_assign_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr)
{
uint32_t max_cmdsn = be32_to_cpu(hdr->max_cmdsn);
uint32_t exp_cmdsn = be32_to_cpu(hdr->exp_cmdsn);
if (max_cmdsn < exp_cmdsn -1 &&
max_cmdsn > exp_cmdsn - INVALID_SN_DELTA)
return ISCSI_ERR_MAX_CMDSN;
if (max_cmdsn > session->max_cmdsn ||
max_cmdsn < session->max_cmdsn - INVALID_SN_DELTA)
session->max_cmdsn = max_cmdsn;
if (exp_cmdsn > session->exp_cmdsn ||
exp_cmdsn < session->exp_cmdsn - INVALID_SN_DELTA)
session->exp_cmdsn = exp_cmdsn;
return 0;
}
static inline int
iscsi_hdr_extract(struct iscsi_conn *conn)
{
struct sk_buff *skb = conn->in.skb;
if (conn->in.copy >= conn->hdr_size &&
conn->in_progress == IN_PROGRESS_WAIT_HEADER) {
/*
* Zero-copy PDU Header: using connection context
* to store header pointer.
*/
if (skb_shinfo(skb)->frag_list == NULL &&
!skb_shinfo(skb)->nr_frags)
conn->in.hdr = (struct iscsi_hdr *)
((char*)skb->data + conn->in.offset);
else {
/* ignoring return code since we checked
* in.copy before */
skb_copy_bits(skb, conn->in.offset,
&conn->hdr, conn->hdr_size);
conn->in.hdr = &conn->hdr;
}
conn->in.offset += conn->hdr_size;
conn->in.copy -= conn->hdr_size;
} else {
int hdr_remains;
int copylen;
/*
* PDU header scattered across SKB's,
* copying it... This'll happen quite rarely.
*/
if (conn->in_progress == IN_PROGRESS_WAIT_HEADER)
conn->in.hdr_offset = 0;
hdr_remains = conn->hdr_size - conn->in.hdr_offset;
BUG_ON(hdr_remains <= 0);
copylen = min(conn->in.copy, hdr_remains);
skb_copy_bits(skb, conn->in.offset,
(char*)&conn->hdr + conn->in.hdr_offset, copylen);
debug_tcp("PDU gather offset %d bytes %d in.offset %d "
"in.copy %d\n", conn->in.hdr_offset, copylen,
conn->in.offset, conn->in.copy);
conn->in.offset += copylen;
conn->in.copy -= copylen;
if (copylen < hdr_remains) {
conn->in_progress = IN_PROGRESS_HEADER_GATHER;
conn->in.hdr_offset += copylen;
return -EAGAIN;
}
conn->in.hdr = &conn->hdr;
conn->discontiguous_hdr_cnt++;
conn->in_progress = IN_PROGRESS_WAIT_HEADER;
}
return 0;
}
static inline void
iscsi_ctask_cleanup(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
{
struct scsi_cmnd *sc = ctask->sc;
struct iscsi_session *session = conn->session;
spin_lock(&session->lock);
if (unlikely(!sc)) {
spin_unlock(&session->lock);
return;
}
if (sc->sc_data_direction == DMA_TO_DEVICE) {
struct iscsi_data_task *dtask, *n;
/* WRITE: cleanup Data-Out's if any */
spin_lock(&conn->lock);
list_for_each_entry_safe(dtask, n, &ctask->dataqueue, item) {
list_del(&dtask->item);
mempool_free(dtask, ctask->datapool);
}
spin_unlock(&conn->lock);
}
ctask->xmstate = XMSTATE_IDLE;
ctask->r2t = NULL;
ctask->sc = NULL;
__kfifo_put(session->cmdpool.queue, (void*)&ctask, sizeof(void*));
spin_unlock(&session->lock);
}
/**
* iscsi_cmd_rsp - SCSI Command Response processing
* @conn: iscsi connection
* @ctask: scsi command task
**/
static int
iscsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
{
int rc;
struct iscsi_cmd_rsp *rhdr = (struct iscsi_cmd_rsp *)conn->in.hdr;
struct iscsi_session *session = conn->session;
struct scsi_cmnd *sc = ctask->sc;
rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr);
if (rc) {
sc->result = (DID_ERROR << 16);
goto out;
}
conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
sc->result = (DID_OK << 16) | rhdr->cmd_status;
if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) {
sc->result = (DID_ERROR << 16);
goto out;
}
if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION && conn->senselen) {
int sensecopy = min(conn->senselen, SCSI_SENSE_BUFFERSIZE);
memcpy(sc->sense_buffer, conn->data + 2, sensecopy);
debug_scsi("copied %d bytes of sense\n", sensecopy);
}
if (sc->sc_data_direction == DMA_TO_DEVICE)
goto out;
if (rhdr->flags & ISCSI_FLAG_CMD_UNDERFLOW) {
int res_count = be32_to_cpu(rhdr->residual_count);
if (res_count > 0 && res_count <= sc->request_bufflen)
sc->resid = res_count;
else
sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
} else if (rhdr->flags & ISCSI_FLAG_CMD_BIDI_UNDERFLOW)
sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
else if (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW)
sc->resid = be32_to_cpu(rhdr->residual_count);
out:
debug_scsi("done [sc %lx res %d itt 0x%x]\n",
(long)sc, sc->result, ctask->itt);
conn->scsirsp_pdus_cnt++;
iscsi_ctask_cleanup(conn, ctask);
sc->scsi_done(sc);
return rc;
}
/**
* iscsi_data_rsp - SCSI Data-In Response processing
* @conn: iscsi connection
* @ctask: scsi command task
**/
static int
iscsi_data_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
{
int rc;
struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)conn->in.hdr;
struct iscsi_session *session = conn->session;
int datasn = be32_to_cpu(rhdr->datasn);
rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr);
if (rc)
return rc;
/*
* setup Data-In byte counter (gets decremented..)
*/
ctask->data_count = conn->in.datalen;
if (conn->in.datalen == 0)
return 0;
if (ctask->datasn != datasn)
return ISCSI_ERR_DATASN;
ctask->datasn++;
ctask->data_offset = be32_to_cpu(rhdr->offset);
if (ctask->data_offset + conn->in.datalen > ctask->total_length)
return ISCSI_ERR_DATA_OFFSET;
if (rhdr->flags & ISCSI_FLAG_DATA_STATUS) {
struct scsi_cmnd *sc = ctask->sc;
conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
if (rhdr->flags & ISCSI_FLAG_CMD_UNDERFLOW) {
int res_count = be32_to_cpu(rhdr->residual_count);
if (res_count > 0 &&
res_count <= sc->request_bufflen) {
sc->resid = res_count;
sc->result = (DID_OK << 16) | rhdr->cmd_status;
} else
sc->result = (DID_BAD_TARGET << 16) |
rhdr->cmd_status;
} else if (rhdr->flags & ISCSI_FLAG_CMD_BIDI_UNDERFLOW)
sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
else if (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW) {
sc->resid = be32_to_cpu(rhdr->residual_count);
sc->result = (DID_OK << 16) | rhdr->cmd_status;
} else
sc->result = (DID_OK << 16) | rhdr->cmd_status;
}
conn->datain_pdus_cnt++;
return 0;
}
/**
* iscsi_solicit_data_init - initialize first Data-Out
* @conn: iscsi connection
* @ctask: scsi command task
* @r2t: R2T info
*
* Notes:
* Initialize first Data-Out within this R2T sequence and finds
* proper data_offset within this SCSI command.
*
* This function is called with connection lock taken.
**/
static void
iscsi_solicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
struct iscsi_r2t_info *r2t)
{
struct iscsi_data *hdr;
struct iscsi_data_task *dtask;
struct scsi_cmnd *sc = ctask->sc;
dtask = mempool_alloc(ctask->datapool, GFP_ATOMIC);
BUG_ON(!dtask);
hdr = &dtask->hdr;
memset(hdr, 0, sizeof(struct iscsi_data));
hdr->ttt = r2t->ttt;
hdr->datasn = cpu_to_be32(r2t->solicit_datasn);
r2t->solicit_datasn++;
hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
memcpy(hdr->lun, ctask->hdr.lun, sizeof(hdr->lun));
hdr->itt = ctask->hdr.itt;
hdr->exp_statsn = r2t->exp_statsn;
hdr->offset = cpu_to_be32(r2t->data_offset);
if (r2t->data_length > conn->max_xmit_dlength) {
hton24(hdr->dlength, conn->max_xmit_dlength);
r2t->data_count = conn->max_xmit_dlength;
hdr->flags = 0;
} else {
hton24(hdr->dlength, r2t->data_length);
r2t->data_count = r2t->data_length;
hdr->flags = ISCSI_FLAG_CMD_FINAL;
}
conn->dataout_pdus_cnt++;
r2t->sent = 0;
iscsi_buf_init_virt(&r2t->headbuf, (char*)hdr,
sizeof(struct iscsi_hdr));
r2t->dtask = dtask;
if (sc->use_sg) {
int i, sg_count = 0;
struct scatterlist *sg = sc->request_buffer;
r2t->sg = NULL;
for (i = 0; i < sc->use_sg; i++, sg += 1) {
/* FIXME: prefetch ? */
if (sg_count + sg->length > r2t->data_offset) {
int page_offset;
/* sg page found! */
/* offset within this page */
page_offset = r2t->data_offset - sg_count;
/* fill in this buffer */
iscsi_buf_init_sg(&r2t->sendbuf, sg);
r2t->sendbuf.sg.offset += page_offset;
r2t->sendbuf.sg.length -= page_offset;
/* xmit logic will continue with next one */
r2t->sg = sg + 1;
break;
}
sg_count += sg->length;
}
BUG_ON(r2t->sg == NULL);
} else
iscsi_buf_init_iov(&ctask->sendbuf,
(char*)sc->request_buffer + r2t->data_offset,
r2t->data_count);
list_add(&dtask->item, &ctask->dataqueue);
}
/**
* iscsi_r2t_rsp - iSCSI R2T Response processing
* @conn: iscsi connection
* @ctask: scsi command task
**/
static int
iscsi_r2t_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
{
struct iscsi_r2t_info *r2t;
struct iscsi_session *session = conn->session;
struct iscsi_r2t_rsp *rhdr = (struct iscsi_r2t_rsp *)conn->in.hdr;
int r2tsn = be32_to_cpu(rhdr->r2tsn);
int rc;
if (conn->in.ahslen)
return ISCSI_ERR_AHSLEN;
if (conn->in.datalen)
return ISCSI_ERR_DATALEN;
if (ctask->exp_r2tsn && ctask->exp_r2tsn != r2tsn)
return ISCSI_ERR_R2TSN;
rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr);
if (rc)
return rc;
/* FIXME: use R2TSN to detect missing R2T */
/* fill-in new R2T associated with the task */
spin_lock(&session->lock);
if (!ctask->sc || ctask->mtask ||
session->state != ISCSI_STATE_LOGGED_IN) {
printk(KERN_INFO "iscsi_tcp: dropping R2T itt %d in "
"recovery...\n", ctask->itt);
spin_unlock(&session->lock);
return 0;
}
rc = __kfifo_get(ctask->r2tpool.queue, (void*)&r2t, sizeof(void*));
BUG_ON(!rc);
r2t->exp_statsn = rhdr->statsn;
r2t->data_length = be32_to_cpu(rhdr->data_length);
if (r2t->data_length == 0 ||
r2t->data_length > session->max_burst) {
spin_unlock(&session->lock);
return ISCSI_ERR_DATALEN;
}
r2t->data_offset = be32_to_cpu(rhdr->data_offset);
if (r2t->data_offset + r2t->data_length > ctask->total_length) {
spin_unlock(&session->lock);
return ISCSI_ERR_DATALEN;
}
r2t->ttt = rhdr->ttt; /* no flip */
r2t->solicit_datasn = 0;
iscsi_solicit_data_init(conn, ctask, r2t);
ctask->exp_r2tsn = r2tsn + 1;
ctask->xmstate |= XMSTATE_SOL_HDR;
__kfifo_put(ctask->r2tqueue, (void*)&r2t, sizeof(void*));
__kfifo_put(conn->writequeue, (void*)&ctask, sizeof(void*));
schedule_work(&conn->xmitwork);
conn->r2t_pdus_cnt++;
spin_unlock(&session->lock);
return 0;
}
static int
iscsi_hdr_recv(struct iscsi_conn *conn)
{
int rc = 0;
struct iscsi_hdr *hdr;
struct iscsi_cmd_task *ctask;
struct iscsi_session *session = conn->session;
uint32_t cdgst, rdgst = 0;
hdr = conn->in.hdr;
/* verify PDU length */
conn->in.datalen = ntoh24(hdr->dlength);
if (conn->in.datalen > conn->max_recv_dlength) {
printk(KERN_ERR "iscsi_tcp: datalen %d > %d\n",
conn->in.datalen, conn->max_recv_dlength);
return ISCSI_ERR_DATALEN;
}
conn->data_copied = 0;
/* read AHS */
conn->in.ahslen = hdr->hlength * 4;
conn->in.offset += conn->in.ahslen;
conn->in.copy -= conn->in.ahslen;
if (conn->in.copy < 0) {
printk(KERN_ERR "iscsi_tcp: can't handle AHS with length "
"%d bytes\n", conn->in.ahslen);
return ISCSI_ERR_AHSLEN;
}
/* calculate read padding */
conn->in.padding = conn->in.datalen & (ISCSI_PAD_LEN-1);
if (conn->in.padding) {
conn->in.padding = ISCSI_PAD_LEN - conn->in.padding;
debug_scsi("read padding %d bytes\n", conn->in.padding);
}
if (conn->hdrdgst_en) {
struct scatterlist sg;
sg_init_one(&sg, (u8 *)hdr,
sizeof(struct iscsi_hdr) + conn->in.ahslen);
crypto_digest_digest(conn->rx_tfm, &sg, 1, (u8 *)&cdgst);
rdgst = *(uint32_t*)((char*)hdr + sizeof(struct iscsi_hdr) +
conn->in.ahslen);
}
/* save opcode for later */
conn->in.opcode = hdr->opcode;
/* verify itt (itt encoding: age+cid+itt) */
if (hdr->itt != cpu_to_be32(ISCSI_RESERVED_TAG)) {
if ((hdr->itt & AGE_MASK) !=
(session->age << AGE_SHIFT)) {
printk(KERN_ERR "iscsi_tcp: received itt %x expected "
"session age (%x)\n", hdr->itt,
session->age & AGE_MASK);
return ISCSI_ERR_BAD_ITT;
}
if ((hdr->itt & CID_MASK) != (conn->id << CID_SHIFT)) {
printk(KERN_ERR "iscsi_tcp: received itt %x, expected "
"CID (%x)\n", hdr->itt, conn->id);
return ISCSI_ERR_BAD_ITT;
}
conn->in.itt = hdr->itt & ITT_MASK;
} else
conn->in.itt = hdr->itt;
debug_tcp("opcode 0x%x offset %d copy %d ahslen %d datalen %d\n",
hdr->opcode, conn->in.offset, conn->in.copy,
conn->in.ahslen, conn->in.datalen);
if (conn->in.itt < session->cmds_max) {
if (conn->hdrdgst_en && cdgst != rdgst) {
printk(KERN_ERR "iscsi_tcp: itt %x: hdrdgst error "
"recv 0x%x calc 0x%x\n", conn->in.itt, rdgst,
cdgst);
return ISCSI_ERR_HDR_DGST;
}
ctask = (struct iscsi_cmd_task *)session->cmds[conn->in.itt];
if (!ctask->sc) {
printk(KERN_INFO "iscsi_tcp: dropping ctask with "
"itt 0x%x\n", ctask->itt);
conn->in.datalen = 0; /* force drop */
return 0;
}
if (ctask->sc->SCp.phase != session->age) {
printk(KERN_ERR "iscsi_tcp: ctask's session age %d, "
"expected %d\n", ctask->sc->SCp.phase,
session->age);
return ISCSI_ERR_SESSION_FAILED;
}
conn->in.ctask = ctask;
debug_scsi("rsp [op 0x%x cid %d sc %lx itt 0x%x len %d]\n",
hdr->opcode, conn->id, (long)ctask->sc,
ctask->itt, conn->in.datalen);
switch(conn->in.opcode) {
case ISCSI_OP_SCSI_CMD_RSP:
BUG_ON((void*)ctask != ctask->sc->SCp.ptr);
if (ctask->hdr.flags & ISCSI_FLAG_CMD_WRITE)
rc = iscsi_cmd_rsp(conn, ctask);
else if (!conn->in.datalen)
rc = iscsi_cmd_rsp(conn, ctask);
else
/*
* got sense or response data; copying PDU
* Header to the connection's header
* placeholder
*/
memcpy(&conn->hdr, hdr,
sizeof(struct iscsi_hdr));
break;
case ISCSI_OP_SCSI_DATA_IN:
BUG_ON((void*)ctask != ctask->sc->SCp.ptr);
/* save flags for non-exceptional status */
conn->in.flags = hdr->flags;
/* save cmd_status for sense data */
conn->in.cmd_status =
((struct iscsi_data_rsp*)hdr)->cmd_status;
rc = iscsi_data_rsp(conn, ctask);
break;
case ISCSI_OP_R2T:
BUG_ON((void*)ctask != ctask->sc->SCp.ptr);
if (ctask->hdr.flags & ISCSI_FLAG_CMD_WRITE &&
ctask->sc->sc_data_direction == DMA_TO_DEVICE)
rc = iscsi_r2t_rsp(conn, ctask);
else
rc = ISCSI_ERR_PROTO;
break;
default:
rc = ISCSI_ERR_BAD_OPCODE;
break;
}
} else if (conn->in.itt >= ISCSI_MGMT_ITT_OFFSET &&
conn->in.itt < ISCSI_MGMT_ITT_OFFSET +
session->mgmtpool_max) {
struct iscsi_mgmt_task *mtask = (struct iscsi_mgmt_task *)
session->mgmt_cmds[conn->in.itt -
ISCSI_MGMT_ITT_OFFSET];
debug_scsi("immrsp [op 0x%x cid %d itt 0x%x len %d]\n",
conn->in.opcode, conn->id, mtask->itt,
conn->in.datalen);
switch(conn->in.opcode) {
case ISCSI_OP_LOGIN_RSP:
case ISCSI_OP_TEXT_RSP:
case ISCSI_OP_LOGOUT_RSP:
rc = iscsi_check_assign_cmdsn(session,
(struct iscsi_nopin*)hdr);
if (rc)
break;
if (!conn->in.datalen) {
rc = iscsi_recv_pdu(iscsi_handle(conn), hdr,
NULL, 0);
if (conn->login_mtask != mtask) {
spin_lock(&session->lock);
__kfifo_put(session->mgmtpool.queue,
(void*)&mtask, sizeof(void*));
spin_unlock(&session->lock);
}
}
break;
case ISCSI_OP_SCSI_TMFUNC_RSP:
rc = iscsi_check_assign_cmdsn(session,
(struct iscsi_nopin*)hdr);
if (rc)
break;
if (conn->in.datalen || conn->in.ahslen) {
rc = ISCSI_ERR_PROTO;
break;
}
conn->tmfrsp_pdus_cnt++;
spin_lock(&session->lock);
if (conn->tmabort_state == TMABORT_INITIAL) {
__kfifo_put(session->mgmtpool.queue,
(void*)&mtask, sizeof(void*));
conn->tmabort_state =
((struct iscsi_tm_rsp *)hdr)->
response == ISCSI_TMF_RSP_COMPLETE ?
TMABORT_SUCCESS:TMABORT_FAILED;
/* unblock eh_abort() */
wake_up(&conn->ehwait);
}
spin_unlock(&session->lock);
break;
case ISCSI_OP_NOOP_IN:
if (hdr->ttt != ISCSI_RESERVED_TAG) {
rc = ISCSI_ERR_PROTO;
break;
}
rc = iscsi_check_assign_cmdsn(session,
(struct iscsi_nopin*)hdr);
if (rc)
break;
conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
if (!conn->in.datalen) {
struct iscsi_mgmt_task *mtask;
rc = iscsi_recv_pdu(iscsi_handle(conn), hdr,
NULL, 0);
mtask = (struct iscsi_mgmt_task *)
session->mgmt_cmds[conn->in.itt -
ISCSI_MGMT_ITT_OFFSET];
if (conn->login_mtask != mtask) {
spin_lock(&session->lock);
__kfifo_put(session->mgmtpool.queue,
(void*)&mtask, sizeof(void*));
spin_unlock(&session->lock);
}
}
break;
default:
rc = ISCSI_ERR_BAD_OPCODE;
break;
}
} else if (conn->in.itt == ISCSI_RESERVED_TAG) {
switch(conn->in.opcode) {
case ISCSI_OP_NOOP_IN:
if (!conn->in.datalen) {
rc = iscsi_check_assign_cmdsn(session,
(struct iscsi_nopin*)hdr);
if (!rc && hdr->ttt != ISCSI_RESERVED_TAG)
rc = iscsi_recv_pdu(iscsi_handle(conn),
hdr, NULL, 0);
} else
rc = ISCSI_ERR_PROTO;
break;
case ISCSI_OP_REJECT:
/* we need sth like iscsi_reject_rsp()*/
case ISCSI_OP_ASYNC_EVENT:
/* we need sth like iscsi_async_event_rsp() */
rc = ISCSI_ERR_BAD_OPCODE;
break;
default:
rc = ISCSI_ERR_BAD_OPCODE;
break;
}
} else
rc = ISCSI_ERR_BAD_ITT;
return rc;
}
/**
* iscsi_ctask_copy - copy skb bits to the destanation cmd task
* @conn: iscsi connection
* @ctask: scsi command task
* @buf: buffer to copy to
* @buf_size: size of buffer
* @offset: offset within the buffer
*
* Notes:
* The function calls skb_copy_bits() and updates per-connection and
* per-cmd byte counters.
*
* Read counters (in bytes):
*
* conn->in.offset offset within in progress SKB
* conn->in.copy left to copy from in progress SKB
* including padding
* conn->in.copied copied already from in progress SKB
* conn->data_copied copied already from in progress buffer
* ctask->sent total bytes sent up to the MidLayer
* ctask->data_count left to copy from in progress Data-In
* buf_left left to copy from in progress buffer
**/
static inline int
iscsi_ctask_copy(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
void *buf, int buf_size, int offset)
{
int buf_left = buf_size - (conn->data_copied + offset);
int size = min(conn->in.copy, buf_left);
int rc;
size = min(size, ctask->data_count);
debug_tcp("ctask_copy %d bytes at offset %d copied %d\n",
size, conn->in.offset, conn->in.copied);
BUG_ON(size <= 0);
BUG_ON(ctask->sent + size > ctask->total_length);
rc = skb_copy_bits(conn->in.skb, conn->in.offset,
(char*)buf + (offset + conn->data_copied), size);
/* must fit into skb->len */
BUG_ON(rc);
conn->in.offset += size;
conn->in.copy -= size;
conn->in.copied += size;
conn->data_copied += size;
ctask->sent += size;
ctask->data_count -= size;
BUG_ON(conn->in.copy < 0);
BUG_ON(ctask->data_count < 0);
if (buf_size != (conn->data_copied + offset)) {
if (!ctask->data_count) {
BUG_ON(buf_size - conn->data_copied < 0);
/* done with this PDU */
return buf_size - conn->data_copied;
}
return -EAGAIN;
}
/* done with this buffer or with both - PDU and buffer */
conn->data_copied = 0;
return 0;
}
/**
* iscsi_tcp_copy - copy skb bits to the destanation buffer
* @conn: iscsi connection
* @buf: buffer to copy to
* @buf_size: number of bytes to copy
*
* Notes:
* The function calls skb_copy_bits() and updates per-connection
* byte counters.
**/
static inline int
iscsi_tcp_copy(struct iscsi_conn *conn, void *buf, int buf_size)
{
int buf_left = buf_size - conn->data_copied;
int size = min(conn->in.copy, buf_left);
int rc;
debug_tcp("tcp_copy %d bytes at offset %d copied %d\n",
size, conn->in.offset, conn->data_copied);
BUG_ON(size <= 0);
rc = skb_copy_bits(conn->in.skb, conn->in.offset,
(char*)buf + conn->data_copied, size);
BUG_ON(rc);
conn->in.offset += size;
conn->in.copy -= size;
conn->in.copied += size;
conn->data_copied += size;
if (buf_size != conn->data_copied)
return -EAGAIN;
return 0;
}
static inline void
partial_sg_digest_update(struct iscsi_conn *conn, struct scatterlist *sg,
int offset, int length)
{
struct scatterlist temp;
memcpy(&temp, sg, sizeof(struct scatterlist));
temp.offset = offset;
temp.length = length;
crypto_digest_update(conn->data_rx_tfm, &temp, 1);
}
static int iscsi_scsi_data_in(struct iscsi_conn *conn)
{
struct iscsi_cmd_task *ctask = conn->in.ctask;
struct scsi_cmnd *sc = ctask->sc;
struct scatterlist tmp, *sg;
int i, offset, rc = 0;
BUG_ON((void*)ctask != sc->SCp.ptr);
/*
* copying Data-In into the Scsi_Cmnd
*/
if (!sc->use_sg) {
i = ctask->data_count;
rc = iscsi_ctask_copy(conn, ctask, sc->request_buffer,
sc->request_bufflen, ctask->data_offset);
if (rc == -EAGAIN)
return rc;
if (conn->datadgst_en) {
sg_init_one(&tmp, sc->request_buffer, i);
crypto_digest_update(conn->data_rx_tfm, &tmp, 1);
}
rc = 0;
goto done;
}
offset = ctask->data_offset;
sg = sc->request_buffer;
if (ctask->data_offset)
for (i = 0; i < ctask->sg_count; i++)
offset -= sg[i].length;
/* we've passed through partial sg*/
if (offset < 0)
offset = 0;
for (i = ctask->sg_count; i < sc->use_sg; i++) {
char *dest;
dest = kmap_atomic(sg[i].page, KM_SOFTIRQ0);
rc = iscsi_ctask_copy(conn, ctask, dest + sg[i].offset,
sg[i].length, offset);
kunmap_atomic(dest, KM_SOFTIRQ0);
if (rc == -EAGAIN)
/* continue with the next SKB/PDU */
return rc;
if (!rc) {
if (conn->datadgst_en) {
if (!offset)
crypto_digest_update(conn->data_rx_tfm,
&sg[i], 1);
else
partial_sg_digest_update(conn, &sg[i],
sg[i].offset + offset,
sg[i].length - offset);
}
offset = 0;
ctask->sg_count++;
}
if (!ctask->data_count) {
if (rc && conn->datadgst_en)
/*
* data-in is complete, but buffer not...
*/
partial_sg_digest_update(conn, &sg[i],
sg[i].offset, sg[i].length-rc);
rc = 0;
break;
}
if (!conn->in.copy)
return -EAGAIN;
}
BUG_ON(ctask->data_count);
done:
/* check for non-exceptional status */
if (conn->in.flags & ISCSI_FLAG_DATA_STATUS) {
debug_scsi("done [sc %lx res %d itt 0x%x]\n",
(long)sc, sc->result, ctask->itt);
conn->scsirsp_pdus_cnt++;
iscsi_ctask_cleanup(conn, ctask);
sc->scsi_done(sc);
}
return rc;
}
static int
iscsi_data_recv(struct iscsi_conn *conn)
{
struct iscsi_session *session = conn->session;
int rc = 0;
switch(conn->in.opcode) {
case ISCSI_OP_SCSI_DATA_IN:
rc = iscsi_scsi_data_in(conn);
break;
case ISCSI_OP_SCSI_CMD_RSP: {
/*
* SCSI Sense Data:
* copying the entire Data Segment.
*/
if (iscsi_tcp_copy(conn, conn->data, conn->in.datalen)) {
rc = -EAGAIN;
goto exit;
}
/*
* check for sense
*/
conn->in.hdr = &conn->hdr;
conn->senselen = (conn->data[0] << 8) | conn->data[1];
rc = iscsi_cmd_rsp(conn, conn->in.ctask);
}
break;
case ISCSI_OP_TEXT_RSP:
case ISCSI_OP_LOGIN_RSP:
case ISCSI_OP_NOOP_IN: {
struct iscsi_mgmt_task *mtask = NULL;
if (conn->in.itt != ISCSI_RESERVED_TAG)
mtask = (struct iscsi_mgmt_task *)
session->mgmt_cmds[conn->in.itt -
ISCSI_MGMT_ITT_OFFSET];
/*
* Collect data segment to the connection's data
* placeholder
*/
if (iscsi_tcp_copy(conn, conn->data, conn->in.datalen)) {
rc = -EAGAIN;
goto exit;
}
rc = iscsi_recv_pdu(iscsi_handle(conn), conn->in.hdr,
conn->data, conn->in.datalen);
if (mtask && conn->login_mtask != mtask) {
spin_lock(&session->lock);
__kfifo_put(session->mgmtpool.queue, (void*)&mtask,
sizeof(void*));
spin_unlock(&session->lock);
}
}
break;
default:
BUG_ON(1);
}
exit:
return rc;
}
/**
* iscsi_tcp_data_recv - TCP receive in sendfile fashion
* @rd_desc: read descriptor
* @skb: socket buffer
* @offset: offset in skb
* @len: skb->len - offset
**/
static int
iscsi_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb,
unsigned int offset, size_t len)
{
int rc;
struct iscsi_conn *conn = rd_desc->arg.data;
int processed;
char pad[ISCSI_PAD_LEN];
struct scatterlist sg;
/*
* Save current SKB and its offset in the corresponding
* connection context.
*/
conn->in.copy = skb->len - offset;
conn->in.offset = offset;
conn->in.skb = skb;
conn->in.len = conn->in.copy;
BUG_ON(conn->in.copy <= 0);
debug_tcp("in %d bytes\n", conn->in.copy);
more:
conn->in.copied = 0;
rc = 0;
if (unlikely(conn->suspend_rx)) {
debug_tcp("conn %d Rx suspended!\n", conn->id);
return 0;
}
if (conn->in_progress == IN_PROGRESS_WAIT_HEADER ||
conn->in_progress == IN_PROGRESS_HEADER_GATHER) {
rc = iscsi_hdr_extract(conn);
if (rc) {
if (rc == -EAGAIN)
goto nomore;
else {
iscsi_conn_failure(conn, rc);
return 0;
}
}
/*
* Verify and process incoming PDU header.
*/
rc = iscsi_hdr_recv(conn);
if (!rc && conn->in.datalen) {
if (conn->datadgst_en &&
conn->in.opcode == ISCSI_OP_SCSI_DATA_IN) {
BUG_ON(!conn->data_rx_tfm);
crypto_digest_init(conn->data_rx_tfm);
}
conn->in_progress = IN_PROGRESS_DATA_RECV;
} else if (rc) {
iscsi_conn_failure(conn, rc);
return 0;
}
}
if (conn->in_progress == IN_PROGRESS_DDIGEST_RECV) {
debug_tcp("extra data_recv offset %d copy %d\n",
conn->in.offset, conn->in.copy);
if (conn->in.opcode == ISCSI_OP_SCSI_DATA_IN) {
uint32_t recv_digest;
skb_copy_bits(conn->in.skb, conn->in.offset,
&recv_digest, 4);
conn->in.offset += 4;
conn->in.copy -= 4;
if (recv_digest != conn->in.datadgst) {
debug_tcp("iscsi_tcp: data digest error!"
"0x%x != 0x%x\n", recv_digest,
conn->in.datadgst);
iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
return 0;
} else {
debug_tcp("iscsi_tcp: data digest match!"
"0x%x == 0x%x\n", recv_digest,
conn->in.datadgst);
conn->in_progress = IN_PROGRESS_WAIT_HEADER;
}
}
}
if (conn->in_progress == IN_PROGRESS_DATA_RECV && conn->in.copy) {
debug_tcp("data_recv offset %d copy %d\n",
conn->in.offset, conn->in.copy);
rc = iscsi_data_recv(conn);
if (rc) {
if (rc == -EAGAIN) {
rd_desc->count = conn->in.datalen -
conn->in.ctask->data_count;
goto again;
}
iscsi_conn_failure(conn, rc);
return 0;
}
conn->in.copy -= conn->in.padding;
conn->in.offset += conn->in.padding;
if (conn->datadgst_en &&
conn->in.opcode == ISCSI_OP_SCSI_DATA_IN) {
if (conn->in.padding) {
debug_tcp("padding -> %d\n", conn->in.padding);
memset(pad, 0, conn->in.padding);
sg_init_one(&sg, pad, conn->in.padding);
crypto_digest_update(conn->data_rx_tfm, &sg, 1);
}
crypto_digest_final(conn->data_rx_tfm,
(u8 *) & conn->in.datadgst);
debug_tcp("rx digest 0x%x\n", conn->in.datadgst);
conn->in_progress = IN_PROGRESS_DDIGEST_RECV;
} else
conn->in_progress = IN_PROGRESS_WAIT_HEADER;
}
debug_tcp("f, processed %d from out of %d padding %d\n",
conn->in.offset - offset, (int)len, conn->in.padding);
BUG_ON(conn->in.offset - offset > len);
if (conn->in.offset - offset != len) {
debug_tcp("continue to process %d bytes\n",
(int)len - (conn->in.offset - offset));
goto more;
}
nomore:
processed = conn->in.offset - offset;
BUG_ON(processed == 0);
return processed;
again:
processed = conn->in.offset - offset;
debug_tcp("c, processed %d from out of %d rd_desc_cnt %d\n",
processed, (int)len, (int)rd_desc->count);
BUG_ON(processed == 0);
BUG_ON(processed > len);
conn->rxdata_octets += processed;
return processed;
}
static void
iscsi_tcp_data_ready(struct sock *sk, int flag)
{
struct iscsi_conn *conn = sk->sk_user_data;
read_descriptor_t rd_desc;
read_lock(&sk->sk_callback_lock);
/* use rd_desc to pass 'conn' to iscsi_tcp_data_recv */
rd_desc.arg.data = conn;
rd_desc.count = 0;
tcp_read_sock(sk, &rd_desc, iscsi_tcp_data_recv);
read_unlock(&sk->sk_callback_lock);
}
static void
iscsi_tcp_state_change(struct sock *sk)
{
struct iscsi_conn *conn;
struct iscsi_session *session;
void (*old_state_change)(struct sock *);
read_lock(&sk->sk_callback_lock);
conn = (struct iscsi_conn*)sk->sk_user_data;
session = conn->session;
if (sk->sk_state == TCP_CLOSE_WAIT ||
sk->sk_state == TCP_CLOSE) {
debug_tcp("iscsi_tcp_state_change: TCP_CLOSE|TCP_CLOSE_WAIT\n");
iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
}
old_state_change = conn->old_state_change;
read_unlock(&sk->sk_callback_lock);
old_state_change(sk);
}
/**
* iscsi_write_space - Called when more output buffer space is available
* @sk: socket space is available for
**/
static void
iscsi_write_space(struct sock *sk)
{
struct iscsi_conn *conn = (struct iscsi_conn*)sk->sk_user_data;
conn->old_write_space(sk);
debug_tcp("iscsi_write_space: cid %d\n", conn->id);
clear_bit(SUSPEND_BIT, &conn->suspend_tx);
schedule_work(&conn->xmitwork);
}
static void
iscsi_conn_set_callbacks(struct iscsi_conn *conn)
{
struct sock *sk = conn->sock->sk;
/* assign new callbacks */
write_lock_bh(&sk->sk_callback_lock);
sk->sk_user_data = conn;
conn->old_data_ready = sk->sk_data_ready;
conn->old_state_change = sk->sk_state_change;
conn->old_write_space = sk->sk_write_space;
sk->sk_data_ready = iscsi_tcp_data_ready;
sk->sk_state_change = iscsi_tcp_state_change;
sk->sk_write_space = iscsi_write_space;
write_unlock_bh(&sk->sk_callback_lock);
}
static void
iscsi_conn_restore_callbacks(struct iscsi_conn *conn)
{
struct sock *sk = conn->sock->sk;
/* restore socket callbacks, see also: iscsi_conn_set_callbacks() */
write_lock_bh(&sk->sk_callback_lock);
sk->sk_user_data = NULL;
sk->sk_data_ready = conn->old_data_ready;
sk->sk_state_change = conn->old_state_change;
sk->sk_write_space = conn->old_write_space;
sk->sk_no_check = 0;
write_unlock_bh(&sk->sk_callback_lock);
}
/**
* iscsi_send - generic send routine
* @sk: kernel's socket
* @buf: buffer to write from
* @size: actual size to write
* @flags: socket's flags
*
* Notes:
* depending on buffer will use tcp_sendpage() or tcp_sendmsg().
* buf->sg.offset == -1 tells us that buffer is non S/G and forces
* to use tcp_sendmsg().
*/
static inline int
iscsi_send(struct socket *sk, struct iscsi_buf *buf, int size, int flags)
{
int res;
if ((int)buf->sg.offset >= 0) {
int offset = buf->sg.offset + buf->sent;
/* tcp_sendpage */
res = sk->ops->sendpage(sk, buf->sg.page, offset, size, flags);
} else {
struct msghdr msg;
buf->iov.iov_base = iscsi_buf_iov_base(buf);
buf->iov.iov_len = size;
memset(&msg, 0, sizeof(struct msghdr));
/* tcp_sendmsg */
res = kernel_sendmsg(sk, &msg, &buf->iov, 1, size);
}
return res;
}
/**
* iscsi_sendhdr - send PDU Header via tcp_sendpage()
* @conn: iscsi connection
* @buf: buffer to write from
* @datalen: lenght of data to be sent after the header
*
* Notes:
* (Tx, Fast Path)
**/
static inline int
iscsi_sendhdr(struct iscsi_conn *conn, struct iscsi_buf *buf, int datalen)
{
struct socket *sk = conn->sock;
int flags = 0; /* MSG_DONTWAIT; */
int res, size;
size = buf->sg.length - buf->sent;
BUG_ON(buf->sent + size > buf->sg.length);
if (buf->sent + size != buf->sg.length || datalen)
flags |= MSG_MORE;
res = iscsi_send(sk, buf, size, flags);
debug_tcp("sendhdr %d bytes, sent %d res %d\n", size, buf->sent, res);
if (res >= 0) {
conn->txdata_octets += res;
buf->sent += res;
if (size != res)
return -EAGAIN;
return 0;
} else if (res == -EAGAIN) {
conn->sendpage_failures_cnt++;
set_bit(SUSPEND_BIT, &conn->suspend_tx);
} else if (res == -EPIPE)
iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
return res;
}
/**
* iscsi_sendpage - send one page of iSCSI Data-Out.
* @conn: iscsi connection
* @buf: buffer to write from
* @count: remaining data
* @sent: number of bytes sent
*
* Notes:
* (Tx, Fast Path)
**/
static inline int
iscsi_sendpage(struct iscsi_conn *conn, struct iscsi_buf *buf,
int *count, int *sent)
{
struct socket *sk = conn->sock;
int flags = 0; /* MSG_DONTWAIT; */
int res, size;
size = buf->sg.length - buf->sent;
BUG_ON(buf->sent + size > buf->sg.length);
if (size > *count)
size = *count;
if (buf->sent + size != buf->sg.length || *count != size)
flags |= MSG_MORE;
res = iscsi_send(sk, buf, size, flags);
debug_tcp("sendpage: %d bytes, sent %d left %d sent %d res %d\n",
size, buf->sent, *count, *sent, res);
if (res >= 0) {
conn->txdata_octets += res;
buf->sent += res;
*count -= res;
*sent += res;
if (size != res)
return -EAGAIN;
return 0;
} else if (res == -EAGAIN) {
conn->sendpage_failures_cnt++;
set_bit(SUSPEND_BIT, &conn->suspend_tx);
} else if (res == -EPIPE)
iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
return res;
}
static inline void
iscsi_data_digest_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
{
BUG_ON(!conn->data_tx_tfm);
crypto_digest_init(conn->data_tx_tfm);
ctask->digest_count = 4;
}
static inline void
iscsi_buf_data_digest_update(struct iscsi_conn *conn, struct iscsi_buf *buf)
{
struct scatterlist sg;
if (buf->sg.offset != -1)
crypto_digest_update(conn->data_tx_tfm, &buf->sg, 1);
else {
sg_init_one(&sg, (char *)buf->sg.page, buf->sg.length);
crypto_digest_update(conn->data_tx_tfm, &sg, 1);
}
}
static inline int
iscsi_digest_final_send(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
struct iscsi_buf *buf, uint32_t *digest, int final)
{
int rc = 0;
int sent = 0;
if (final)
crypto_digest_final(conn->data_tx_tfm, (u8*)digest);
iscsi_buf_init_virt(buf, (char*)digest, 4);
rc = iscsi_sendpage(conn, buf, &ctask->digest_count, &sent);
if (rc) {
ctask->datadigest = *digest;
ctask->xmstate |= XMSTATE_DATA_DIGEST;
} else
ctask->digest_count = 4;
return rc;
}
/**
* iscsi_solicit_data_cont - initialize next Data-Out
* @conn: iscsi connection
* @ctask: scsi command task
* @r2t: R2T info
* @left: bytes left to transfer
*
* Notes:
* Initialize next Data-Out within this R2T sequence and continue
* to process next Scatter-Gather element(if any) of this SCSI command.
*
* Called under connection lock.
**/
static void
iscsi_solicit_data_cont(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
struct iscsi_r2t_info *r2t, int left)
{
struct iscsi_data *hdr;
struct iscsi_data_task *dtask;
struct scsi_cmnd *sc = ctask->sc;
int new_offset;
dtask = mempool_alloc(ctask->datapool, GFP_ATOMIC);
BUG_ON(!dtask);
hdr = &dtask->hdr;
memset(hdr, 0, sizeof(struct iscsi_data));
hdr->ttt = r2t->ttt;
hdr->datasn = cpu_to_be32(r2t->solicit_datasn);
r2t->solicit_datasn++;
hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
memcpy(hdr->lun, ctask->hdr.lun, sizeof(hdr->lun));
hdr->itt = ctask->hdr.itt;
hdr->exp_statsn = r2t->exp_statsn;
new_offset = r2t->data_offset + r2t->sent;
hdr->offset = cpu_to_be32(new_offset);
if (left > conn->max_xmit_dlength) {
hton24(hdr->dlength, conn->max_xmit_dlength);
r2t->data_count = conn->max_xmit_dlength;
} else {
hton24(hdr->dlength, left);
r2t->data_count = left;
hdr->flags = ISCSI_FLAG_CMD_FINAL;
}
conn->dataout_pdus_cnt++;
iscsi_buf_init_virt(&r2t->headbuf, (char*)hdr,
sizeof(struct iscsi_hdr));
r2t->dtask = dtask;
if (sc->use_sg && !iscsi_buf_left(&r2t->sendbuf)) {
BUG_ON(ctask->bad_sg == r2t->sg);
iscsi_buf_init_sg(&r2t->sendbuf, r2t->sg);
r2t->sg += 1;
} else
iscsi_buf_init_iov(&ctask->sendbuf,
(char*)sc->request_buffer + new_offset,
r2t->data_count);
list_add(&dtask->item, &ctask->dataqueue);
}
static void
iscsi_unsolicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
{
struct iscsi_data *hdr;
struct iscsi_data_task *dtask;
dtask = mempool_alloc(ctask->datapool, GFP_ATOMIC);
BUG_ON(!dtask);
hdr = &dtask->hdr;
memset(hdr, 0, sizeof(struct iscsi_data));
hdr->ttt = cpu_to_be32(ISCSI_RESERVED_TAG);
hdr->datasn = cpu_to_be32(ctask->unsol_datasn);
ctask->unsol_datasn++;
hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
memcpy(hdr->lun, ctask->hdr.lun, sizeof(hdr->lun));
hdr->itt = ctask->hdr.itt;
hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
hdr->offset = cpu_to_be32(ctask->total_length -
ctask->r2t_data_count -
ctask->unsol_count);
if (ctask->unsol_count > conn->max_xmit_dlength) {
hton24(hdr->dlength, conn->max_xmit_dlength);
ctask->data_count = conn->max_xmit_dlength;
hdr->flags = 0;
} else {
hton24(hdr->dlength, ctask->unsol_count);
ctask->data_count = ctask->unsol_count;
hdr->flags = ISCSI_FLAG_CMD_FINAL;
}
iscsi_buf_init_virt(&ctask->headbuf, (char*)hdr,
sizeof(struct iscsi_hdr));
list_add(&dtask->item, &ctask->dataqueue);
ctask->dtask = dtask;
}
/**
* iscsi_cmd_init - Initialize iSCSI SCSI_READ or SCSI_WRITE commands
* @conn: iscsi connection
* @ctask: scsi command task
* @sc: scsi command
**/
static void
iscsi_cmd_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
struct scsi_cmnd *sc)
{
struct iscsi_session *session = conn->session;
BUG_ON(__kfifo_len(ctask->r2tqueue));
ctask->sc = sc;
ctask->conn = conn;
ctask->hdr.opcode = ISCSI_OP_SCSI_CMD;
ctask->hdr.flags = ISCSI_ATTR_SIMPLE;
int_to_scsilun(sc->device->lun, (struct scsi_lun *)ctask->hdr.lun);
ctask->hdr.itt = ctask->itt | (conn->id << CID_SHIFT) |
(session->age << AGE_SHIFT);
ctask->hdr.data_length = cpu_to_be32(sc->request_bufflen);
ctask->hdr.cmdsn = cpu_to_be32(session->cmdsn); session->cmdsn++;
ctask->hdr.exp_statsn = cpu_to_be32(conn->exp_statsn);
memcpy(ctask->hdr.cdb, sc->cmnd, sc->cmd_len);
memset(&ctask->hdr.cdb[sc->cmd_len], 0, MAX_COMMAND_SIZE - sc->cmd_len);
ctask->mtask = NULL;
ctask->sent = 0;
ctask->sg_count = 0;
ctask->total_length = sc->request_bufflen;
if (sc->sc_data_direction == DMA_TO_DEVICE) {
ctask->exp_r2tsn = 0;
ctask->hdr.flags |= ISCSI_FLAG_CMD_WRITE;
BUG_ON(ctask->total_length == 0);
if (sc->use_sg) {
struct scatterlist *sg = sc->request_buffer;
iscsi_buf_init_sg(&ctask->sendbuf,
&sg[ctask->sg_count++]);
ctask->sg = sg;
ctask->bad_sg = sg + sc->use_sg;
} else {
iscsi_buf_init_iov(&ctask->sendbuf, sc->request_buffer,
sc->request_bufflen);
}
/*
* Write counters:
*
* imm_count bytes to be sent right after
* SCSI PDU Header
*
* unsol_count bytes(as Data-Out) to be sent
* without R2T ack right after
* immediate data
*
* r2t_data_count bytes to be sent via R2T ack's
*
* pad_count bytes to be sent as zero-padding
*/
ctask->imm_count = 0;
ctask->unsol_count = 0;
ctask->unsol_datasn = 0;
ctask->xmstate = XMSTATE_W_HDR;
/* calculate write padding */
ctask->pad_count = ctask->total_length & (ISCSI_PAD_LEN-1);
if (ctask->pad_count) {
ctask->pad_count = ISCSI_PAD_LEN - ctask->pad_count;
debug_scsi("write padding %d bytes\n",
ctask->pad_count);
ctask->xmstate |= XMSTATE_W_PAD;
}
if (session->imm_data_en) {
if (ctask->total_length >= session->first_burst)
ctask->imm_count = min(session->first_burst,
conn->max_xmit_dlength);
else
ctask->imm_count = min(ctask->total_length,
conn->max_xmit_dlength);
hton24(ctask->hdr.dlength, ctask->imm_count);
ctask->xmstate |= XMSTATE_IMM_DATA;
} else
zero_data(ctask->hdr.dlength);
if (!session->initial_r2t_en)
ctask->unsol_count = min(session->first_burst,
ctask->total_length) - ctask->imm_count;
if (!ctask->unsol_count)
/* No unsolicit Data-Out's */
ctask->hdr.flags |= ISCSI_FLAG_CMD_FINAL;
else
ctask->xmstate |= XMSTATE_UNS_HDR | XMSTATE_UNS_INIT;
ctask->r2t_data_count = ctask->total_length -
ctask->imm_count -
ctask->unsol_count;
debug_scsi("cmd [itt %x total %d imm %d imm_data %d "
"r2t_data %d]\n",
ctask->itt, ctask->total_length, ctask->imm_count,
ctask->unsol_count, ctask->r2t_data_count);
} else {
ctask->hdr.flags |= ISCSI_FLAG_CMD_FINAL;
if (sc->sc_data_direction == DMA_FROM_DEVICE)
ctask->hdr.flags |= ISCSI_FLAG_CMD_READ;
ctask->datasn = 0;
ctask->xmstate = XMSTATE_R_HDR;
zero_data(ctask->hdr.dlength);
}
iscsi_buf_init_virt(&ctask->headbuf, (char*)&ctask->hdr,
sizeof(struct iscsi_hdr));
conn->scsicmd_pdus_cnt++;
}
/**
* iscsi_mtask_xmit - xmit management(immediate) task
* @conn: iscsi connection
* @mtask: task management task
*
* Notes:
* The function can return -EAGAIN in which case caller must
* call it again later, or recover. '0' return code means successful
* xmit.
*
* Management xmit state machine consists of two states:
* IN_PROGRESS_IMM_HEAD - PDU Header xmit in progress
* IN_PROGRESS_IMM_DATA - PDU Data xmit in progress
**/
static int
iscsi_mtask_xmit(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask)
{
debug_scsi("mtask deq [cid %d state %x itt 0x%x]\n",
conn->id, mtask->xmstate, mtask->itt);
if (mtask->xmstate & XMSTATE_IMM_HDR) {
mtask->xmstate &= ~XMSTATE_IMM_HDR;
if (mtask->data_count)
mtask->xmstate |= XMSTATE_IMM_DATA;
if (conn->c_stage != ISCSI_CONN_INITIAL_STAGE &&
conn->stop_stage != STOP_CONN_RECOVER &&
conn->hdrdgst_en)
iscsi_hdr_digest(conn, &mtask->headbuf,
(u8*)mtask->hdrext);
if (iscsi_sendhdr(conn, &mtask->headbuf, mtask->data_count)) {
mtask->xmstate |= XMSTATE_IMM_HDR;
if (mtask->data_count)
mtask->xmstate &= ~XMSTATE_IMM_DATA;
return -EAGAIN;
}
}
if (mtask->xmstate & XMSTATE_IMM_DATA) {
BUG_ON(!mtask->data_count);
mtask->xmstate &= ~XMSTATE_IMM_DATA;
/* FIXME: implement.
* Virtual buffer could be spreaded across multiple pages...
*/
do {
if (iscsi_sendpage(conn, &mtask->sendbuf,
&mtask->data_count, &mtask->sent)) {
mtask->xmstate |= XMSTATE_IMM_DATA;
return -EAGAIN;
}
} while (mtask->data_count);
}
BUG_ON(mtask->xmstate != XMSTATE_IDLE);
return 0;
}
static inline int
handle_xmstate_r_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
{
ctask->xmstate &= ~XMSTATE_R_HDR;
if (conn->hdrdgst_en)
iscsi_hdr_digest(conn, &ctask->headbuf, (u8*)ctask->hdrext);
if (!iscsi_sendhdr(conn, &ctask->headbuf, 0)) {
BUG_ON(ctask->xmstate != XMSTATE_IDLE);
return 0; /* wait for Data-In */
}
ctask->xmstate |= XMSTATE_R_HDR;
return -EAGAIN;
}
static inline int
handle_xmstate_w_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
{
ctask->xmstate &= ~XMSTATE_W_HDR;
if (conn->hdrdgst_en)
iscsi_hdr_digest(conn, &ctask->headbuf, (u8*)ctask->hdrext);
if (iscsi_sendhdr(conn, &ctask->headbuf, ctask->imm_count)) {
ctask->xmstate |= XMSTATE_W_HDR;
return -EAGAIN;
}
return 0;
}
static inline int
handle_xmstate_data_digest(struct iscsi_conn *conn,
struct iscsi_cmd_task *ctask)
{
ctask->xmstate &= ~XMSTATE_DATA_DIGEST;
debug_tcp("resent data digest 0x%x\n", ctask->datadigest);
if (iscsi_digest_final_send(conn, ctask, &ctask->immbuf,
&ctask->datadigest, 0)) {
ctask->xmstate |= XMSTATE_DATA_DIGEST;
debug_tcp("resent data digest 0x%x fail!\n",
ctask->datadigest);
return -EAGAIN;
}
return 0;
}
static inline int
handle_xmstate_imm_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
{
BUG_ON(!ctask->imm_count);
ctask->xmstate &= ~XMSTATE_IMM_DATA;
if (conn->datadgst_en) {
iscsi_data_digest_init(conn, ctask);
ctask->immdigest = 0;
}
for (;;) {
if (iscsi_sendpage(conn, &ctask->sendbuf, &ctask->imm_count,
&ctask->sent)) {
ctask->xmstate |= XMSTATE_IMM_DATA;
if (conn->datadgst_en) {
crypto_digest_final(conn->data_tx_tfm,
(u8*)&ctask->immdigest);
debug_tcp("tx imm sendpage fail 0x%x\n",
ctask->datadigest);
}
return -EAGAIN;
}
if (conn->datadgst_en)
iscsi_buf_data_digest_update(conn, &ctask->sendbuf);
if (!ctask->imm_count)
break;
iscsi_buf_init_sg(&ctask->sendbuf,
&ctask->sg[ctask->sg_count++]);
}
if (conn->datadgst_en && !(ctask->xmstate & XMSTATE_W_PAD)) {
if (iscsi_digest_final_send(conn, ctask, &ctask->immbuf,
&ctask->immdigest, 1)) {
debug_tcp("sending imm digest 0x%x fail!\n",
ctask->immdigest);
return -EAGAIN;
}
debug_tcp("sending imm digest 0x%x\n", ctask->immdigest);
}
return 0;
}
static inline int
handle_xmstate_uns_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
{
struct iscsi_data_task *dtask;
ctask->xmstate |= XMSTATE_UNS_DATA;
if (ctask->xmstate & XMSTATE_UNS_INIT) {
iscsi_unsolicit_data_init(conn, ctask);
BUG_ON(!ctask->dtask);
dtask = ctask->dtask;
if (conn->hdrdgst_en)
iscsi_hdr_digest(conn, &ctask->headbuf,
(u8*)dtask->hdrext);
ctask->xmstate &= ~XMSTATE_UNS_INIT;
}
if (iscsi_sendhdr(conn, &ctask->headbuf, ctask->data_count)) {
ctask->xmstate &= ~XMSTATE_UNS_DATA;
ctask->xmstate |= XMSTATE_UNS_HDR;
return -EAGAIN;
}
debug_scsi("uns dout [itt 0x%x dlen %d sent %d]\n",
ctask->itt, ctask->unsol_count, ctask->sent);
return 0;
}
static inline int
handle_xmstate_uns_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
{
struct iscsi_data_task *dtask = ctask->dtask;
BUG_ON(!ctask->data_count);
ctask->xmstate &= ~XMSTATE_UNS_DATA;
if (conn->datadgst_en) {
iscsi_data_digest_init(conn, ctask);
dtask->digest = 0;
}
for (;;) {
int start = ctask->sent;
if (iscsi_sendpage(conn, &ctask->sendbuf, &ctask->data_count,
&ctask->sent)) {
ctask->unsol_count -= ctask->sent - start;
ctask->xmstate |= XMSTATE_UNS_DATA;
/* will continue with this ctask later.. */
if (conn->datadgst_en) {
crypto_digest_final(conn->data_tx_tfm,
(u8 *)&dtask->digest);
debug_tcp("tx uns data fail 0x%x\n",
dtask->digest);
}
return -EAGAIN;
}
BUG_ON(ctask->sent > ctask->total_length);
ctask->unsol_count -= ctask->sent - start;
/*
* XXX:we may run here with un-initial sendbuf.
* so pass it
*/
if (conn->datadgst_en && ctask->sent - start > 0)
iscsi_buf_data_digest_update(conn, &ctask->sendbuf);
if (!ctask->data_count)
break;
iscsi_buf_init_sg(&ctask->sendbuf,
&ctask->sg[ctask->sg_count++]);
}
BUG_ON(ctask->unsol_count < 0);
/*
* Done with the Data-Out. Next, check if we need
* to send another unsolicited Data-Out.
*/
if (ctask->unsol_count) {
if (conn->datadgst_en) {
if (iscsi_digest_final_send(conn, ctask,
&dtask->digestbuf,
&dtask->digest, 1)) {
debug_tcp("send uns digest 0x%x fail\n",
dtask->digest);
return -EAGAIN;
}
debug_tcp("sending uns digest 0x%x, more uns\n",
dtask->digest);
}
ctask->xmstate |= XMSTATE_UNS_INIT;
return 1;
}
if (conn->datadgst_en && !(ctask->xmstate & XMSTATE_W_PAD)) {
if (iscsi_digest_final_send(conn, ctask,
&dtask->digestbuf,
&dtask->digest, 1)) {
debug_tcp("send last uns digest 0x%x fail\n",
dtask->digest);
return -EAGAIN;
}
debug_tcp("sending uns digest 0x%x\n",dtask->digest);
}
return 0;
}
static inline int
handle_xmstate_sol_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
{
struct iscsi_session *session = conn->session;
struct iscsi_r2t_info *r2t = ctask->r2t;
struct iscsi_data_task *dtask = r2t->dtask;
int left;
ctask->xmstate &= ~XMSTATE_SOL_DATA;
ctask->dtask = dtask;
if (conn->datadgst_en) {
iscsi_data_digest_init(conn, ctask);
dtask->digest = 0;
}
solicit_again:
/*
* send Data-Out whitnin this R2T sequence.
*/
if (!r2t->data_count)
goto data_out_done;
if (iscsi_sendpage(conn, &r2t->sendbuf, &r2t->data_count, &r2t->sent)) {
ctask->xmstate |= XMSTATE_SOL_DATA;
/* will continue with this ctask later.. */
if (conn->datadgst_en) {
crypto_digest_final(conn->data_tx_tfm,
(u8 *)&dtask->digest);
debug_tcp("r2t data send fail 0x%x\n", dtask->digest);
}
return -EAGAIN;
}
BUG_ON(r2t->data_count < 0);
if (conn->datadgst_en)
iscsi_buf_data_digest_update(conn, &r2t->sendbuf);
if (r2t->data_count) {
BUG_ON(ctask->sc->use_sg == 0);
if (!iscsi_buf_left(&r2t->sendbuf)) {
BUG_ON(ctask->bad_sg == r2t->sg);
iscsi_buf_init_sg(&r2t->sendbuf, r2t->sg);
r2t->sg += 1;
}
goto solicit_again;
}
data_out_done:
/*
* Done with this Data-Out. Next, check if we have
* to send another Data-Out for this R2T.
*/
BUG_ON(r2t->data_length - r2t->sent < 0);
left = r2t->data_length - r2t->sent;
if (left) {
if (conn->datadgst_en) {
if (iscsi_digest_final_send(conn, ctask,
&dtask->digestbuf,
&dtask->digest, 1)) {
debug_tcp("send r2t data digest 0x%x"
"fail\n", dtask->digest);
return -EAGAIN;
}
debug_tcp("r2t data send digest 0x%x\n",
dtask->digest);
}
iscsi_solicit_data_cont(conn, ctask, r2t, left);
ctask->xmstate |= XMSTATE_SOL_DATA;
ctask->xmstate &= ~XMSTATE_SOL_HDR;
return 1;
}
/*
* Done with this R2T. Check if there are more
* outstanding R2Ts ready to be processed.
*/
BUG_ON(ctask->r2t_data_count - r2t->data_length < 0);
if (conn->datadgst_en) {
if (iscsi_digest_final_send(conn, ctask, &dtask->digestbuf,
&dtask->digest, 1)) {
debug_tcp("send last r2t data digest 0x%x"
"fail\n", dtask->digest);
return -EAGAIN;
}
debug_tcp("r2t done dout digest 0x%x\n", dtask->digest);
}
ctask->r2t_data_count -= r2t->data_length;
ctask->r2t = NULL;
spin_lock_bh(&session->lock);
__kfifo_put(ctask->r2tpool.queue, (void*)&r2t, sizeof(void*));
spin_unlock_bh(&session->lock);
if (__kfifo_get(ctask->r2tqueue, (void*)&r2t, sizeof(void*))) {
ctask->r2t = r2t;
ctask->xmstate |= XMSTATE_SOL_DATA;
ctask->xmstate &= ~XMSTATE_SOL_HDR;
return 1;
}
return 0;
}
static inline int
handle_xmstate_w_pad(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
{
struct iscsi_data_task *dtask = ctask->dtask;
int sent;
ctask->xmstate &= ~XMSTATE_W_PAD;
iscsi_buf_init_virt(&ctask->sendbuf, (char*)&ctask->pad,
ctask->pad_count);
if (iscsi_sendpage(conn, &ctask->sendbuf, &ctask->pad_count, &sent)) {
ctask->xmstate |= XMSTATE_W_PAD;
return -EAGAIN;
}
if (conn->datadgst_en) {
iscsi_buf_data_digest_update(conn, &ctask->sendbuf);
/* imm data? */
if (!dtask) {
if (iscsi_digest_final_send(conn, ctask, &ctask->immbuf,
&ctask->immdigest, 1)) {
debug_tcp("send padding digest 0x%x"
"fail!\n", ctask->immdigest);
return -EAGAIN;
}
debug_tcp("done with padding, digest 0x%x\n",
ctask->datadigest);
} else {
if (iscsi_digest_final_send(conn, ctask,
&dtask->digestbuf,
&dtask->digest, 1)) {
debug_tcp("send padding digest 0x%x"
"fail\n", dtask->digest);
return -EAGAIN;
}
debug_tcp("done with padding, digest 0x%x\n",
dtask->digest);
}
}
return 0;
}
static int
iscsi_ctask_xmit(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
{
int rc = 0;
debug_scsi("ctask deq [cid %d xmstate %x itt 0x%x]\n",
conn->id, ctask->xmstate, ctask->itt);
/*
* serialize with TMF AbortTask
*/
if (ctask->mtask)
return rc;
if (ctask->xmstate & XMSTATE_R_HDR) {
rc = handle_xmstate_r_hdr(conn, ctask);
return rc;
}
if (ctask->xmstate & XMSTATE_W_HDR) {
rc = handle_xmstate_w_hdr(conn, ctask);
if (rc)
return rc;
}
/* XXX: for data digest xmit recover */
if (ctask->xmstate & XMSTATE_DATA_DIGEST) {
rc = handle_xmstate_data_digest(conn, ctask);
if (rc)
return rc;
}
if (ctask->xmstate & XMSTATE_IMM_DATA) {
rc = handle_xmstate_imm_data(conn, ctask);
if (rc)
return rc;
}
if (ctask->xmstate & XMSTATE_UNS_HDR) {
BUG_ON(!ctask->unsol_count);
ctask->xmstate &= ~XMSTATE_UNS_HDR;
unsolicit_head_again:
rc = handle_xmstate_uns_hdr(conn, ctask);
if (rc)
return rc;
}
if (ctask->xmstate & XMSTATE_UNS_DATA) {
rc = handle_xmstate_uns_data(conn, ctask);
if (rc == 1)
goto unsolicit_head_again;
else if (rc)
return rc;
goto done;
}
if (ctask->xmstate & XMSTATE_SOL_HDR) {
struct iscsi_r2t_info *r2t;
ctask->xmstate &= ~XMSTATE_SOL_HDR;
ctask->xmstate |= XMSTATE_SOL_DATA;
if (!ctask->r2t)
__kfifo_get(ctask->r2tqueue, (void*)&ctask->r2t,
sizeof(void*));
solicit_head_again:
r2t = ctask->r2t;
if (conn->hdrdgst_en)
iscsi_hdr_digest(conn, &r2t->headbuf,
(u8*)r2t->dtask->hdrext);
if (iscsi_sendhdr(conn, &r2t->headbuf, r2t->data_count)) {
ctask->xmstate &= ~XMSTATE_SOL_DATA;
ctask->xmstate |= XMSTATE_SOL_HDR;
return -EAGAIN;
}
debug_scsi("sol dout [dsn %d itt 0x%x dlen %d sent %d]\n",
r2t->solicit_datasn - 1, ctask->itt, r2t->data_count,
r2t->sent);
}
if (ctask->xmstate & XMSTATE_SOL_DATA) {
rc = handle_xmstate_sol_data(conn, ctask);
if (rc == 1)
goto solicit_head_again;
if (rc)
return rc;
}
done:
/*
* Last thing to check is whether we need to send write
* padding. Note that we check for xmstate equality, not just the bit.
*/
if (ctask->xmstate == XMSTATE_W_PAD)
rc = handle_xmstate_w_pad(conn, ctask);
return rc;
}
/**
* iscsi_data_xmit - xmit any command into the scheduled connection
* @conn: iscsi connection
*
* Notes:
* The function can return -EAGAIN in which case the caller must
* re-schedule it again later or recover. '0' return code means
* successful xmit.
**/
static int
iscsi_data_xmit(struct iscsi_conn *conn)
{
if (unlikely(conn->suspend_tx)) {
debug_tcp("conn %d Tx suspended!\n", conn->id);
return 0;
}
/*
* Transmit in the following order:
*
* 1) un-finished xmit (ctask or mtask)
* 2) immediate control PDUs
* 3) write data
* 4) SCSI commands
* 5) non-immediate control PDUs
*
* No need to lock around __kfifo_get as long as
* there's one producer and one consumer.
*/
BUG_ON(conn->ctask && conn->mtask);
if (conn->ctask) {
if (iscsi_ctask_xmit(conn, conn->ctask))
goto again;
/* done with this in-progress ctask */
conn->ctask = NULL;
}
if (conn->mtask) {
if (iscsi_mtask_xmit(conn, conn->mtask))
goto again;
/* done with this in-progress mtask */
conn->mtask = NULL;
}
/* process immediate first */
if (unlikely(__kfifo_len(conn->immqueue))) {
struct iscsi_session *session = conn->session;
while (__kfifo_get(conn->immqueue, (void*)&conn->mtask,
sizeof(void*))) {
if (iscsi_mtask_xmit(conn, conn->mtask))
goto again;
if (conn->mtask->hdr.itt ==
cpu_to_be32(ISCSI_RESERVED_TAG)) {
spin_lock_bh(&session->lock);
__kfifo_put(session->mgmtpool.queue,
(void*)&conn->mtask, sizeof(void*));
spin_unlock_bh(&session->lock);
}
}
/* done with this mtask */
conn->mtask = NULL;
}
/* process write queue */
while (__kfifo_get(conn->writequeue, (void*)&conn->ctask,
sizeof(void*))) {
if (iscsi_ctask_xmit(conn, conn->ctask))
goto again;
}
/* process command queue */
while (__kfifo_get(conn->xmitqueue, (void*)&conn->ctask,
sizeof(void*))) {
if (iscsi_ctask_xmit(conn, conn->ctask))
goto again;
}
/* done with this ctask */
conn->ctask = NULL;
/* process the rest control plane PDUs, if any */
if (unlikely(__kfifo_len(conn->mgmtqueue))) {
struct iscsi_session *session = conn->session;
while (__kfifo_get(conn->mgmtqueue, (void*)&conn->mtask,
sizeof(void*))) {
if (iscsi_mtask_xmit(conn, conn->mtask))
goto again;
if (conn->mtask->hdr.itt ==
cpu_to_be32(ISCSI_RESERVED_TAG)) {
spin_lock_bh(&session->lock);
__kfifo_put(session->mgmtpool.queue,
(void*)&conn->mtask,
sizeof(void*));
spin_unlock_bh(&session->lock);
}
}
/* done with this mtask */
conn->mtask = NULL;
}
return 0;
again:
if (unlikely(conn->suspend_tx))
return 0;
return -EAGAIN;
}
static void
iscsi_xmitworker(void *data)
{
struct iscsi_conn *conn = data;
/*
* serialize Xmit worker on a per-connection basis.
*/
down(&conn->xmitsema);
if (iscsi_data_xmit(conn))
schedule_work(&conn->xmitwork);
up(&conn->xmitsema);
}
#define FAILURE_BAD_HOST 1
#define FAILURE_SESSION_FAILED 2
#define FAILURE_SESSION_FREED 3
#define FAILURE_WINDOW_CLOSED 4
#define FAILURE_SESSION_TERMINATE 5
static int
iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
{
struct Scsi_Host *host;
int reason = 0;
struct iscsi_session *session;
struct iscsi_conn *conn = NULL;
struct iscsi_cmd_task *ctask = NULL;
sc->scsi_done = done;
sc->result = 0;
host = sc->device->host;
session = iscsi_hostdata(host->hostdata);
BUG_ON(host != session->host);
spin_lock(&session->lock);
if (session->state != ISCSI_STATE_LOGGED_IN) {
if (session->state == ISCSI_STATE_FAILED) {
reason = FAILURE_SESSION_FAILED;
goto reject;
} else if (session->state == ISCSI_STATE_TERMINATE) {
reason = FAILURE_SESSION_TERMINATE;
goto fault;
}
reason = FAILURE_SESSION_FREED;
goto fault;
}
/*
* Check for iSCSI window and take care of CmdSN wrap-around
*/
if ((int)(session->max_cmdsn - session->cmdsn) < 0) {
reason = FAILURE_WINDOW_CLOSED;
goto reject;
}
conn = session->leadconn;
__kfifo_get(session->cmdpool.queue, (void*)&ctask, sizeof(void*));
BUG_ON(ctask->sc);
sc->SCp.phase = session->age;
sc->SCp.ptr = (char*)ctask;
iscsi_cmd_init(conn, ctask, sc);
__kfifo_put(conn->xmitqueue, (void*)&ctask, sizeof(void*));
debug_scsi(
"ctask enq [%s cid %d sc %lx itt 0x%x len %d cmdsn %d win %d]\n",
sc->sc_data_direction == DMA_TO_DEVICE ? "write" : "read",
conn->id, (long)sc, ctask->itt, sc->request_bufflen,
session->cmdsn, session->max_cmdsn - session->exp_cmdsn + 1);
spin_unlock(&session->lock);
if (!in_interrupt() && !down_trylock(&conn->xmitsema)) {
spin_unlock_irq(host->host_lock);
if (iscsi_data_xmit(conn))
schedule_work(&conn->xmitwork);
up(&conn->xmitsema);
spin_lock_irq(host->host_lock);
} else
schedule_work(&conn->xmitwork);
return 0;
reject:
spin_unlock(&session->lock);
debug_scsi("cmd 0x%x rejected (%d)\n", sc->cmnd[0], reason);
return SCSI_MLQUEUE_HOST_BUSY;
fault:
spin_unlock(&session->lock);
printk(KERN_ERR "iscsi_tcp: cmd 0x%x is not queued (%d)\n",
sc->cmnd[0], reason);
sc->sense_buffer[0] = 0x70;
sc->sense_buffer[2] = NOT_READY;
sc->sense_buffer[7] = 0x6;
sc->sense_buffer[12] = 0x08;
sc->sense_buffer[13] = 0x00;
sc->result = (DID_NO_CONNECT << 16);
sc->resid = sc->request_bufflen;
sc->scsi_done(sc);
return 0;
}
static int
iscsi_pool_init(struct iscsi_queue *q, int max, void ***items, int item_size)
{
int i;
*items = kmalloc(max * sizeof(void*), GFP_KERNEL);
if (*items == NULL)
return -ENOMEM;
q->max = max;
q->pool = kmalloc(max * sizeof(void*), GFP_KERNEL);
if (q->pool == NULL) {
kfree(*items);
return -ENOMEM;
}
q->queue = kfifo_init((void*)q->pool, max * sizeof(void*),
GFP_KERNEL, NULL);
if (q->queue == ERR_PTR(-ENOMEM)) {
kfree(q->pool);
kfree(*items);
return -ENOMEM;
}
for (i = 0; i < max; i++) {
q->pool[i] = kmalloc(item_size, GFP_KERNEL);
if (q->pool[i] == NULL) {
int j;
for (j = 0; j < i; j++)
kfree(q->pool[j]);
kfifo_free(q->queue);
kfree(q->pool);
kfree(*items);
return -ENOMEM;
}
memset(q->pool[i], 0, item_size);
(*items)[i] = q->pool[i];
__kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*));
}
return 0;
}
static void
iscsi_pool_free(struct iscsi_queue *q, void **items)
{
int i;
for (i = 0; i < q->max; i++)
kfree(items[i]);
kfree(q->pool);
kfree(items);
}
static iscsi_connh_t
iscsi_conn_create(iscsi_sessionh_t sessionh, uint32_t conn_idx)
{
struct iscsi_session *session = iscsi_ptr(sessionh);
struct iscsi_conn *conn = NULL;
conn = kmalloc(sizeof(struct iscsi_conn), GFP_KERNEL);
if (conn == NULL)
goto conn_alloc_fail;
memset(conn, 0, sizeof(struct iscsi_conn));
conn->c_stage = ISCSI_CONN_INITIAL_STAGE;
conn->in_progress = IN_PROGRESS_WAIT_HEADER;
conn->id = conn_idx;
conn->exp_statsn = 0;
conn->tmabort_state = TMABORT_INITIAL;
/* initial operational parameters */
conn->hdr_size = sizeof(struct iscsi_hdr);
conn->data_size = DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH;
conn->max_recv_dlength = DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH;
spin_lock_init(&conn->lock);
/* initialize general xmit PDU commands queue */
conn->xmitqueue = kfifo_alloc(session->cmds_max * sizeof(void*),
GFP_KERNEL, NULL);
if (conn->xmitqueue == ERR_PTR(-ENOMEM))
goto xmitqueue_alloc_fail;
/* initialize write response PDU commands queue */
conn->writequeue = kfifo_alloc(session->cmds_max * sizeof(void*),
GFP_KERNEL, NULL);
if (conn->writequeue == ERR_PTR(-ENOMEM))
goto writequeue_alloc_fail;
/* initialize general immediate & non-immediate PDU commands queue */
conn->immqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*),
GFP_KERNEL, NULL);
if (conn->immqueue == ERR_PTR(-ENOMEM))
goto immqueue_alloc_fail;
conn->mgmtqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*),
GFP_KERNEL, NULL);
if (conn->mgmtqueue == ERR_PTR(-ENOMEM))
goto mgmtqueue_alloc_fail;
INIT_WORK(&conn->xmitwork, iscsi_xmitworker, conn);
/* allocate login_mtask used for the login/text sequences */
spin_lock_bh(&session->lock);
if (!__kfifo_get(session->mgmtpool.queue,
(void*)&conn->login_mtask,
sizeof(void*))) {
spin_unlock_bh(&session->lock);
goto login_mtask_alloc_fail;
}
spin_unlock_bh(&session->lock);
/* allocate initial PDU receive place holder */
if (conn->data_size <= PAGE_SIZE)
conn->data = kmalloc(conn->data_size, GFP_KERNEL);
else
conn->data = (void*)__get_free_pages(GFP_KERNEL,
get_order(conn->data_size));
if (!conn->data)
goto max_recv_dlenght_alloc_fail;
init_timer(&conn->tmabort_timer);
init_MUTEX(&conn->xmitsema);
init_waitqueue_head(&conn->ehwait);
return iscsi_handle(conn);
max_recv_dlenght_alloc_fail:
spin_lock_bh(&session->lock);
__kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
sizeof(void*));
spin_unlock_bh(&session->lock);
login_mtask_alloc_fail:
kfifo_free(conn->mgmtqueue);
mgmtqueue_alloc_fail:
kfifo_free(conn->immqueue);
immqueue_alloc_fail:
kfifo_free(conn->writequeue);
writequeue_alloc_fail:
kfifo_free(conn->xmitqueue);
xmitqueue_alloc_fail:
kfree(conn);
conn_alloc_fail:
return iscsi_handle(NULL);
}
static void
iscsi_conn_destroy(iscsi_connh_t connh)
{
struct iscsi_conn *conn = iscsi_ptr(connh);
struct iscsi_session *session = conn->session;
down(&conn->xmitsema);
set_bit(SUSPEND_BIT, &conn->suspend_tx);
if (conn->c_stage == ISCSI_CONN_INITIAL_STAGE && conn->sock) {
struct sock *sk = conn->sock->sk;
/*
* conn_start() has never been called!
* need to cleanup the socket.
*/
write_lock_bh(&sk->sk_callback_lock);
set_bit(SUSPEND_BIT, &conn->suspend_rx);
write_unlock_bh(&sk->sk_callback_lock);
sock_hold(conn->sock->sk);
iscsi_conn_restore_callbacks(conn);
sock_put(conn->sock->sk);
sock_release(conn->sock);
conn->sock = NULL;
}
spin_lock_bh(&session->lock);
conn->c_stage = ISCSI_CONN_CLEANUP_WAIT;
if (session->leadconn == conn) {
/*
* leading connection? then give up on recovery.
*/
session->state = ISCSI_STATE_TERMINATE;
wake_up(&conn->ehwait);
}
spin_unlock_bh(&session->lock);
up(&conn->xmitsema);
/*
* Block until all in-progress commands for this connection
* time out or fail.
*/
for (;;) {
spin_lock_bh(&conn->lock);
if (!session->host->host_busy) { /* OK for ERL == 0 */
spin_unlock_bh(&conn->lock);
break;
}
spin_unlock_bh(&conn->lock);
msleep_interruptible(500);
printk("conn_destroy(): host_busy %d host_failed %d\n",
session->host->host_busy, session->host->host_failed);
/*
* force eh_abort() to unblock
*/
wake_up(&conn->ehwait);
}
/* now free crypto */
if (conn->hdrdgst_en || conn->datadgst_en) {
if (conn->tx_tfm)
crypto_free_tfm(conn->tx_tfm);
if (conn->rx_tfm)
crypto_free_tfm(conn->rx_tfm);
if (conn->data_tx_tfm)
crypto_free_tfm(conn->data_tx_tfm);
if (conn->data_rx_tfm)
crypto_free_tfm(conn->data_rx_tfm);
}
/* free conn->data, size = MaxRecvDataSegmentLength */
if (conn->data_size <= PAGE_SIZE)
kfree(conn->data);
else
free_pages((unsigned long)conn->data,
get_order(conn->data_size));
spin_lock_bh(&session->lock);
__kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
sizeof(void*));
list_del(&conn->item);
if (list_empty(&session->connections))
session->leadconn = NULL;
if (session->leadconn && session->leadconn == conn)
session->leadconn = container_of(session->connections.next,
struct iscsi_conn, item);
if (session->leadconn == NULL)
/* none connections exits.. reset sequencing */
session->cmdsn = session->max_cmdsn = session->exp_cmdsn = 1;
spin_unlock_bh(&session->lock);
kfifo_free(conn->xmitqueue);
kfifo_free(conn->writequeue);
kfifo_free(conn->immqueue);
kfifo_free(conn->mgmtqueue);
kfree(conn);
}
static int
iscsi_conn_bind(iscsi_sessionh_t sessionh, iscsi_connh_t connh,
uint32_t transport_fd, int is_leading)
{
struct iscsi_session *session = iscsi_ptr(sessionh);
struct iscsi_conn *tmp = ERR_PTR(-EEXIST), *conn = iscsi_ptr(connh);
struct sock *sk;
struct socket *sock;
int err;
/* lookup for existing socket */
sock = sockfd_lookup(transport_fd, &err);
if (!sock) {
printk(KERN_ERR "iscsi_tcp: sockfd_lookup failed %d\n", err);
return -EEXIST;
}
/* lookup for existing connection */
spin_lock_bh(&session->lock);
list_for_each_entry(tmp, &session->connections, item) {
if (tmp == conn) {
if (conn->c_stage != ISCSI_CONN_STOPPED ||
conn->stop_stage == STOP_CONN_TERM) {
printk(KERN_ERR "iscsi_tcp: can't bind "
"non-stopped connection (%d:%d)\n",
conn->c_stage, conn->stop_stage);
spin_unlock_bh(&session->lock);
return -EIO;
}
break;
}
}
if (tmp != conn) {
/* bind new iSCSI connection to session */
conn->session = session;
list_add(&conn->item, &session->connections);
}
spin_unlock_bh(&session->lock);
if (conn->stop_stage != STOP_CONN_SUSPEND) {
/* bind iSCSI connection and socket */
conn->sock = sock;
/* setup Socket parameters */
sk = sock->sk;
sk->sk_reuse = 1;
sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */
sk->sk_allocation = GFP_ATOMIC;
/* FIXME: disable Nagle's algorithm */
/*
* Intercept TCP callbacks for sendfile like receive
* processing.
*/
iscsi_conn_set_callbacks(conn);
/*
* set receive state machine into initial state
*/
conn->in_progress = IN_PROGRESS_WAIT_HEADER;
}
if (is_leading)
session->leadconn = conn;
/*
* Unblock xmitworker(), Login Phase will pass through.
*/
clear_bit(SUSPEND_BIT, &conn->suspend_rx);
clear_bit(SUSPEND_BIT, &conn->suspend_tx);
return 0;
}
static int
iscsi_conn_start(iscsi_connh_t connh)
{
struct iscsi_conn *conn = iscsi_ptr(connh);
struct iscsi_session *session = conn->session;
struct sock *sk;
/* FF phase warming up... */
if (session == NULL) {
printk(KERN_ERR "iscsi_tcp: can't start unbound connection\n");
return -EPERM;
}
sk = conn->sock->sk;
write_lock_bh(&sk->sk_callback_lock);
spin_lock_bh(&session->lock);
conn->c_stage = ISCSI_CONN_STARTED;
session->state = ISCSI_STATE_LOGGED_IN;
switch(conn->stop_stage) {
case STOP_CONN_RECOVER:
/*
* unblock eh_abort() if it is blocked. re-try all
* commands after successful recovery
*/
session->conn_cnt++;
conn->stop_stage = 0;
conn->tmabort_state = TMABORT_INITIAL;
session->age++;
wake_up(&conn->ehwait);
break;
case STOP_CONN_TERM:
session->conn_cnt++;
conn->stop_stage = 0;
break;
case STOP_CONN_SUSPEND:
conn->stop_stage = 0;
clear_bit(SUSPEND_BIT, &conn->suspend_rx);
clear_bit(SUSPEND_BIT, &conn->suspend_tx);
break;
default:
break;
}
spin_unlock_bh(&session->lock);
write_unlock_bh(&sk->sk_callback_lock);
return 0;
}
static void
iscsi_conn_stop(iscsi_connh_t connh, int flag)
{
struct iscsi_conn *conn = iscsi_ptr(connh);
struct iscsi_session *session = conn->session;
struct sock *sk;
unsigned long flags;
BUG_ON(!conn->sock);
sk = conn->sock->sk;
write_lock_bh(&sk->sk_callback_lock);
set_bit(SUSPEND_BIT, &conn->suspend_rx);
write_unlock_bh(&sk->sk_callback_lock);
down(&conn->xmitsema);
spin_lock_irqsave(session->host->host_lock, flags);
spin_lock(&session->lock);
conn->stop_stage = flag;
conn->c_stage = ISCSI_CONN_STOPPED;
set_bit(SUSPEND_BIT, &conn->suspend_tx);
if (flag != STOP_CONN_SUSPEND)
session->conn_cnt--;
if (session->conn_cnt == 0 || session->leadconn == conn)
session->state = ISCSI_STATE_FAILED;
spin_unlock(&session->lock);
spin_unlock_irqrestore(session->host->host_lock, flags);
if (flag == STOP_CONN_TERM || flag == STOP_CONN_RECOVER) {
struct iscsi_cmd_task *ctask;
struct iscsi_mgmt_task *mtask;
/*
* Socket must go now.
*/
sock_hold(conn->sock->sk);
iscsi_conn_restore_callbacks(conn);
sock_put(conn->sock->sk);
/*
* flush xmit queues.
*/
spin_lock_bh(&session->lock);
while (__kfifo_get(conn->writequeue, (void*)&ctask,
sizeof(void*)) ||
__kfifo_get(conn->xmitqueue, (void*)&ctask,
sizeof(void*))) {
struct iscsi_r2t_info *r2t;
/*
* flush ctask's r2t queues
*/
while (__kfifo_get(ctask->r2tqueue, (void*)&r2t,
sizeof(void*)))
__kfifo_put(ctask->r2tpool.queue, (void*)&r2t,
sizeof(void*));
spin_unlock_bh(&session->lock);
local_bh_disable();
iscsi_ctask_cleanup(conn, ctask);
local_bh_enable();
spin_lock_bh(&session->lock);
}
conn->ctask = NULL;
while (__kfifo_get(conn->immqueue, (void*)&mtask,
sizeof(void*)) ||
__kfifo_get(conn->mgmtqueue, (void*)&mtask,
sizeof(void*))) {
__kfifo_put(session->mgmtpool.queue,
(void*)&mtask, sizeof(void*));
}
conn->mtask = NULL;
spin_unlock_bh(&session->lock);
/*
* release socket only after we stopped data_xmit()
* activity and flushed all outstandings
*/
sock_release(conn->sock);
conn->sock = NULL;
/*
* for connection level recovery we should not calculate
* header digest. conn->hdr_size used for optimization
* in hdr_extract() and will be re-negotiated at
* set_param() time.
*/
if (flag == STOP_CONN_RECOVER)
conn->hdr_size = sizeof(struct iscsi_hdr);
}
up(&conn->xmitsema);
}
static int
iscsi_conn_send_generic(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
char *data, uint32_t data_size)
{
struct iscsi_session *session = conn->session;
struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr;
struct iscsi_mgmt_task *mtask;
spin_lock_bh(&session->lock);
if (session->state == ISCSI_STATE_TERMINATE) {
spin_unlock_bh(&session->lock);
return -EPERM;
}
if (hdr->opcode == (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) ||
hdr->opcode == (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE))
/*
* Login and Text are sent serially, in
* request-followed-by-response sequence.
* Same mtask can be used. Same ITT must be used.
* Note that login_mtask is preallocated at conn_create().
*/
mtask = conn->login_mtask;
else {
BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE);
BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED);
if (!__kfifo_get(session->mgmtpool.queue,
(void*)&mtask, sizeof(void*))) {
spin_unlock_bh(&session->lock);
return -ENOSPC;
}
}
/*
* pre-format CmdSN and ExpStatSN for outgoing PDU.
*/
if (hdr->itt != cpu_to_be32(ISCSI_RESERVED_TAG)) {
hdr->itt = mtask->itt | (conn->id << CID_SHIFT) |
(session->age << AGE_SHIFT);
nop->cmdsn = cpu_to_be32(session->cmdsn);
if (conn->c_stage == ISCSI_CONN_STARTED &&
!(hdr->opcode & ISCSI_OP_IMMEDIATE))
session->cmdsn++;
} else
/* do not advance CmdSN */
nop->cmdsn = cpu_to_be32(session->cmdsn);
nop->exp_statsn = cpu_to_be32(conn->exp_statsn);
memcpy(&mtask->hdr, hdr, sizeof(struct iscsi_hdr));
iscsi_buf_init_virt(&mtask->headbuf, (char*)&mtask->hdr,
sizeof(struct iscsi_hdr));
spin_unlock_bh(&session->lock);
if (data_size) {
memcpy(mtask->data, data, data_size);
mtask->data_count = data_size;
} else
mtask->data_count = 0;
mtask->xmstate = XMSTATE_IMM_HDR;
if (mtask->data_count) {
iscsi_buf_init_iov(&mtask->sendbuf, (char*)mtask->data,
mtask->data_count);
}
debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n",
hdr->opcode, hdr->itt, data_size);
/*
* since send_pdu() could be called at least from two contexts,
* we need to serialize __kfifo_put, so we don't have to take
* additional lock on fast data-path
*/
if (hdr->opcode & ISCSI_OP_IMMEDIATE)
__kfifo_put(conn->immqueue, (void*)&mtask, sizeof(void*));
else
__kfifo_put(conn->mgmtqueue, (void*)&mtask, sizeof(void*));
schedule_work(&conn->xmitwork);
return 0;
}
static int
iscsi_eh_host_reset(struct scsi_cmnd *sc)
{
struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)sc->SCp.ptr;
struct iscsi_conn *conn = ctask->conn;
struct iscsi_session *session = conn->session;
spin_lock_bh(&session->lock);
if (session->state == ISCSI_STATE_TERMINATE) {
debug_scsi("failing host reset: session terminated "
"[CID %d age %d]", conn->id, session->age);
spin_unlock_bh(&session->lock);
return FAILED;
}
spin_unlock_bh(&session->lock);
debug_scsi("failing connection CID %d due to SCSI host reset "
"[itt 0x%x age %d]", conn->id, ctask->itt,
session->age);
iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
return SUCCESS;
}
static void
iscsi_tmabort_timedout(unsigned long data)
{
struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)data;
struct iscsi_conn *conn = ctask->conn;
struct iscsi_session *session = conn->session;
spin_lock(&session->lock);
if (conn->tmabort_state == TMABORT_INITIAL) {
__kfifo_put(session->mgmtpool.queue,
(void*)&ctask->mtask, sizeof(void*));
conn->tmabort_state = TMABORT_TIMEDOUT;
debug_scsi("tmabort timedout [sc %lx itt 0x%x]\n",
(long)ctask->sc, ctask->itt);
/* unblock eh_abort() */
wake_up(&conn->ehwait);
}
spin_unlock(&session->lock);
}
static int
iscsi_eh_abort(struct scsi_cmnd *sc)
{
int rc;
struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)sc->SCp.ptr;
struct iscsi_conn *conn = ctask->conn;
struct iscsi_session *session = conn->session;
conn->eh_abort_cnt++;
debug_scsi("aborting [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
/*
* two cases for ERL=0 here:
*
* 1) connection-level failure;
* 2) recovery due protocol error;
*/
down(&conn->xmitsema);
spin_lock_bh(&session->lock);
if (session->state != ISCSI_STATE_LOGGED_IN) {
if (session->state == ISCSI_STATE_TERMINATE) {
spin_unlock_bh(&session->lock);
up(&conn->xmitsema);
goto failed;
}
spin_unlock_bh(&session->lock);
} else {
struct iscsi_tm *hdr = &conn->tmhdr;
/*
* Still LOGGED_IN...
*/
if (!ctask->sc || sc->SCp.phase != session->age) {
/*
* 1) ctask completed before time out. But session
* is still ok => Happy Retry.
* 2) session was re-open during time out of ctask.
*/
spin_unlock_bh(&session->lock);
up(&conn->xmitsema);
goto success;
}
conn->tmabort_state = TMABORT_INITIAL;
spin_unlock_bh(&session->lock);
/*
* ctask timed out but session is OK
* ERL=0 requires task mgmt abort to be issued on each
* failed command. requests must be serialized.
*/
memset(hdr, 0, sizeof(struct iscsi_tm));
hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
hdr->flags = ISCSI_TM_FUNC_ABORT_TASK;
hdr->flags |= ISCSI_FLAG_CMD_FINAL;
memcpy(hdr->lun, ctask->hdr.lun, sizeof(hdr->lun));
hdr->rtt = ctask->hdr.itt;
hdr->refcmdsn = ctask->hdr.cmdsn;
rc = iscsi_conn_send_generic(conn, (struct iscsi_hdr *)hdr,
NULL, 0);
if (rc) {
iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
debug_scsi("abort sent failure [itt 0x%x]", ctask->itt);
} else {
struct iscsi_r2t_info *r2t;
/*
* TMF abort vs. TMF response race logic
*/
spin_lock_bh(&session->lock);
ctask->mtask = (struct iscsi_mgmt_task *)
session->mgmt_cmds[(hdr->itt & ITT_MASK) -
ISCSI_MGMT_ITT_OFFSET];
/*
* have to flush r2tqueue to avoid r2t leaks
*/
while (__kfifo_get(ctask->r2tqueue, (void*)&r2t,
sizeof(void*))) {
__kfifo_put(ctask->r2tpool.queue, (void*)&r2t,
sizeof(void*));
}
if (conn->tmabort_state == TMABORT_INITIAL) {
conn->tmfcmd_pdus_cnt++;
conn->tmabort_timer.expires = 3*HZ + jiffies;
conn->tmabort_timer.function =
iscsi_tmabort_timedout;
conn->tmabort_timer.data = (unsigned long)ctask;
add_timer(&conn->tmabort_timer);
debug_scsi("abort sent [itt 0x%x]", ctask->itt);
} else {
if (!ctask->sc ||
conn->tmabort_state == TMABORT_SUCCESS) {
conn->tmabort_state = TMABORT_INITIAL;
spin_unlock_bh(&session->lock);
up(&conn->xmitsema);
goto success;
}
conn->tmabort_state = TMABORT_INITIAL;
iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
}
spin_unlock_bh(&session->lock);
}
}
up(&conn->xmitsema);
/*
* block eh thread until:
*
* 1) abort response;
* 2) abort timeout;
* 3) session re-opened;
* 4) session terminated;
*/
for (;;) {
int p_state = session->state;
rc = wait_event_interruptible(conn->ehwait,
(p_state == ISCSI_STATE_LOGGED_IN ?
(session->state == ISCSI_STATE_TERMINATE ||
conn->tmabort_state != TMABORT_INITIAL) :
(session->state == ISCSI_STATE_TERMINATE ||
session->state == ISCSI_STATE_LOGGED_IN)));
if (rc) {
/* shutdown.. */
session->state = ISCSI_STATE_TERMINATE;
goto failed;
}
if (signal_pending(current))
flush_signals(current);
if (session->state == ISCSI_STATE_TERMINATE)
goto failed;
spin_lock_bh(&session->lock);
if (sc->SCp.phase == session->age &&
(conn->tmabort_state == TMABORT_TIMEDOUT ||
conn->tmabort_state == TMABORT_FAILED)) {
conn->tmabort_state = TMABORT_INITIAL;
if (!ctask->sc) {
/*
* ctask completed before tmf abort response or
* time out.
* But session is still ok => Happy Retry.
*/
spin_unlock_bh(&session->lock);
break;
}
spin_unlock_bh(&session->lock);
iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
continue;
}
spin_unlock_bh(&session->lock);
break;
}
success:
debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
rc = SUCCESS;
goto exit;
failed:
debug_scsi("abort failed [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
rc = FAILED;
exit:
del_timer_sync(&conn->tmabort_timer);
down(&conn->xmitsema);
if (conn->sock) {
struct sock *sk = conn->sock->sk;
write_lock_bh(&sk->sk_callback_lock);
iscsi_ctask_cleanup(conn, ctask);
write_unlock_bh(&sk->sk_callback_lock);
}
up(&conn->xmitsema);
return rc;
}
static int
iscsi_r2tpool_alloc(struct iscsi_session *session)
{
int i;
int cmd_i;
/*
* initialize per-task: R2T pool and xmit queue
*/
for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
/*
* pre-allocated x4 as much r2ts to handle race when
* target acks DataOut faster than we data_xmit() queues
* could replenish r2tqueue.
*/
/* R2T pool */
if (iscsi_pool_init(&ctask->r2tpool, session->max_r2t * 4,
(void***)&ctask->r2ts, sizeof(struct iscsi_r2t_info))) {
goto r2t_alloc_fail;
}
/* R2T xmit queue */
ctask->r2tqueue = kfifo_alloc(
session->max_r2t * 4 * sizeof(void*), GFP_KERNEL, NULL);
if (ctask->r2tqueue == ERR_PTR(-ENOMEM)) {
iscsi_pool_free(&ctask->r2tpool, (void**)ctask->r2ts);
goto r2t_alloc_fail;
}
/*
* number of
* Data-Out PDU's within R2T-sequence can be quite big;
* using mempool
*/
ctask->datapool = mempool_create(ISCSI_DTASK_DEFAULT_MAX,
mempool_alloc_slab, mempool_free_slab, taskcache);
if (ctask->datapool == NULL) {
kfifo_free(ctask->r2tqueue);
iscsi_pool_free(&ctask->r2tpool, (void**)ctask->r2ts);
goto r2t_alloc_fail;
}
INIT_LIST_HEAD(&ctask->dataqueue);
}
return 0;
r2t_alloc_fail:
for (i = 0; i < cmd_i; i++) {
mempool_destroy(session->cmds[i]->datapool);
kfifo_free(session->cmds[i]->r2tqueue);
iscsi_pool_free(&session->cmds[i]->r2tpool,
(void**)session->cmds[i]->r2ts);
}
return -ENOMEM;
}
static void
iscsi_r2tpool_free(struct iscsi_session *session)
{
int i;
for (i = 0; i < session->cmds_max; i++) {
mempool_destroy(session->cmds[i]->datapool);
kfifo_free(session->cmds[i]->r2tqueue);
iscsi_pool_free(&session->cmds[i]->r2tpool,
(void**)session->cmds[i]->r2ts);
}
}
static struct scsi_host_template iscsi_sht = {
.name = "iSCSI Initiator over TCP/IP, v."
ISCSI_VERSION_STR,
.queuecommand = iscsi_queuecommand,
.can_queue = ISCSI_XMIT_CMDS_MAX - 1,
.sg_tablesize = ISCSI_SG_TABLESIZE,
.cmd_per_lun = ISCSI_CMD_PER_LUN,
.eh_abort_handler = iscsi_eh_abort,
.eh_host_reset_handler = iscsi_eh_host_reset,
.use_clustering = DISABLE_CLUSTERING,
.proc_name = "iscsi_tcp",
.this_id = -1,
};
static iscsi_sessionh_t
iscsi_session_create(uint32_t initial_cmdsn, struct Scsi_Host *host)
{
int cmd_i;
struct iscsi_session *session;
session = iscsi_hostdata(host->hostdata);
memset(session, 0, sizeof(struct iscsi_session));
session->host = host;
session->id = host->host_no;
session->state = ISCSI_STATE_LOGGED_IN;
session->mgmtpool_max = ISCSI_MGMT_CMDS_MAX;
session->cmds_max = ISCSI_XMIT_CMDS_MAX;
session->cmdsn = initial_cmdsn;
session->exp_cmdsn = initial_cmdsn + 1;
session->max_cmdsn = initial_cmdsn + 1;
session->max_r2t = 1;
/* initialize SCSI PDU commands pool */
if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
(void***)&session->cmds, sizeof(struct iscsi_cmd_task)))
goto cmdpool_alloc_fail;
/* pre-format cmds pool with ITT */
for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++)
session->cmds[cmd_i]->itt = cmd_i;
spin_lock_init(&session->lock);
INIT_LIST_HEAD(&session->connections);
/* initialize immediate command pool */
if (iscsi_pool_init(&session->mgmtpool, session->mgmtpool_max,
(void***)&session->mgmt_cmds, sizeof(struct iscsi_mgmt_task)))
goto mgmtpool_alloc_fail;
/* pre-format immediate cmds pool with ITT */
for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) {
session->mgmt_cmds[cmd_i]->itt = ISCSI_MGMT_ITT_OFFSET + cmd_i;
session->mgmt_cmds[cmd_i]->data = kmalloc(
DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH, GFP_KERNEL);
if (!session->mgmt_cmds[cmd_i]->data) {
int j;
for (j = 0; j < cmd_i; j++)
kfree(session->mgmt_cmds[j]->data);
goto immdata_alloc_fail;
}
}
if (iscsi_r2tpool_alloc(session))
goto r2tpool_alloc_fail;
return iscsi_handle(session);
r2tpool_alloc_fail:
for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++)
kfree(session->mgmt_cmds[cmd_i]->data);
iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds);
immdata_alloc_fail:
mgmtpool_alloc_fail:
iscsi_pool_free(&session->cmdpool, (void**)session->cmds);
cmdpool_alloc_fail:
return iscsi_handle(NULL);
}
static void
iscsi_session_destroy(iscsi_sessionh_t sessionh)
{
int cmd_i;
struct iscsi_data_task *dtask, *n;
struct iscsi_session *session = iscsi_ptr(sessionh);
for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
list_for_each_entry_safe(dtask, n, &ctask->dataqueue, item) {
list_del(&dtask->item);
mempool_free(dtask, ctask->datapool);
}
}
for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++)
kfree(session->mgmt_cmds[cmd_i]->data);
iscsi_r2tpool_free(session);
iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds);
iscsi_pool_free(&session->cmdpool, (void**)session->cmds);
}
static int
iscsi_conn_set_param(iscsi_connh_t connh, enum iscsi_param param,
uint32_t value)
{
struct iscsi_conn *conn = iscsi_ptr(connh);
struct iscsi_session *session = conn->session;
spin_lock_bh(&session->lock);
if (conn->c_stage != ISCSI_CONN_INITIAL_STAGE &&
conn->stop_stage != STOP_CONN_RECOVER) {
printk(KERN_ERR "iscsi_tcp: can not change parameter [%d]\n",
param);
spin_unlock_bh(&session->lock);
return 0;
}
spin_unlock_bh(&session->lock);
switch(param) {
case ISCSI_PARAM_MAX_RECV_DLENGTH: {
char *saveptr = conn->data;
int flags = GFP_KERNEL;
if (conn->data_size >= value) {
conn->max_recv_dlength = value;
break;
}
spin_lock_bh(&session->lock);
if (conn->stop_stage == STOP_CONN_RECOVER)
flags = GFP_ATOMIC;
spin_unlock_bh(&session->lock);
if (value <= PAGE_SIZE)
conn->data = kmalloc(value, flags);
else
conn->data = (void*)__get_free_pages(flags,
get_order(value));
if (conn->data == NULL) {
conn->data = saveptr;
return -ENOMEM;
}
if (conn->data_size <= PAGE_SIZE)
kfree(saveptr);
else
free_pages((unsigned long)saveptr,
get_order(conn->data_size));
conn->max_recv_dlength = value;
conn->data_size = value;
}
break;
case ISCSI_PARAM_MAX_XMIT_DLENGTH:
conn->max_xmit_dlength = value;
break;
case ISCSI_PARAM_HDRDGST_EN:
conn->hdrdgst_en = value;
conn->hdr_size = sizeof(struct iscsi_hdr);
if (conn->hdrdgst_en) {
conn->hdr_size += sizeof(__u32);
if (!conn->tx_tfm)
conn->tx_tfm = crypto_alloc_tfm("crc32c", 0);
if (!conn->tx_tfm)
return -ENOMEM;
if (!conn->rx_tfm)
conn->rx_tfm = crypto_alloc_tfm("crc32c", 0);
if (!conn->rx_tfm) {
crypto_free_tfm(conn->tx_tfm);
return -ENOMEM;
}
} else {
if (conn->tx_tfm)
crypto_free_tfm(conn->tx_tfm);
if (conn->rx_tfm)
crypto_free_tfm(conn->rx_tfm);
}
break;
case ISCSI_PARAM_DATADGST_EN:
conn->datadgst_en = value;
if (conn->datadgst_en) {
if (!conn->data_tx_tfm)
conn->data_tx_tfm =
crypto_alloc_tfm("crc32c", 0);
if (!conn->data_tx_tfm)
return -ENOMEM;
if (!conn->data_rx_tfm)
conn->data_rx_tfm =
crypto_alloc_tfm("crc32c", 0);
if (!conn->data_rx_tfm) {
crypto_free_tfm(conn->data_tx_tfm);
return -ENOMEM;
}
} else {
if (conn->data_tx_tfm)
crypto_free_tfm(conn->data_tx_tfm);
if (conn->data_rx_tfm)
crypto_free_tfm(conn->data_rx_tfm);
}
break;
case ISCSI_PARAM_INITIAL_R2T_EN:
session->initial_r2t_en = value;
break;
case ISCSI_PARAM_MAX_R2T:
if (session->max_r2t == roundup_pow_of_two(value))
break;
iscsi_r2tpool_free(session);
session->max_r2t = value;
if (session->max_r2t & (session->max_r2t - 1))
session->max_r2t = roundup_pow_of_two(session->max_r2t);
if (iscsi_r2tpool_alloc(session))
return -ENOMEM;
break;
case ISCSI_PARAM_IMM_DATA_EN:
session->imm_data_en = value;
break;
case ISCSI_PARAM_FIRST_BURST:
session->first_burst = value;
break;
case ISCSI_PARAM_MAX_BURST:
session->max_burst = value;
break;
case ISCSI_PARAM_PDU_INORDER_EN:
session->pdu_inorder_en = value;
break;
case ISCSI_PARAM_DATASEQ_INORDER_EN:
session->dataseq_inorder_en = value;
break;
case ISCSI_PARAM_ERL:
session->erl = value;
break;
case ISCSI_PARAM_IFMARKER_EN:
BUG_ON(value);
session->ifmarker_en = value;
break;
case ISCSI_PARAM_OFMARKER_EN:
BUG_ON(value);
session->ofmarker_en = value;
break;
default:
break;
}
return 0;
}
static int
iscsi_conn_get_param(iscsi_connh_t connh, enum iscsi_param param,
uint32_t *value)
{
struct iscsi_conn *conn = iscsi_ptr(connh);
struct iscsi_session *session = conn->session;
switch(param) {
case ISCSI_PARAM_MAX_RECV_DLENGTH:
*value = conn->max_recv_dlength;
break;
case ISCSI_PARAM_MAX_XMIT_DLENGTH:
*value = conn->max_xmit_dlength;
break;
case ISCSI_PARAM_HDRDGST_EN:
*value = conn->hdrdgst_en;
break;
case ISCSI_PARAM_DATADGST_EN:
*value = conn->datadgst_en;
break;
case ISCSI_PARAM_INITIAL_R2T_EN:
*value = session->initial_r2t_en;
break;
case ISCSI_PARAM_MAX_R2T:
*value = session->max_r2t;
break;
case ISCSI_PARAM_IMM_DATA_EN:
*value = session->imm_data_en;
break;
case ISCSI_PARAM_FIRST_BURST:
*value = session->first_burst;
break;
case ISCSI_PARAM_MAX_BURST:
*value = session->max_burst;
break;
case ISCSI_PARAM_PDU_INORDER_EN:
*value = session->pdu_inorder_en;
break;
case ISCSI_PARAM_DATASEQ_INORDER_EN:
*value = session->dataseq_inorder_en;
break;
case ISCSI_PARAM_ERL:
*value = session->erl;
break;
case ISCSI_PARAM_IFMARKER_EN:
*value = session->ifmarker_en;
break;
case ISCSI_PARAM_OFMARKER_EN:
*value = session->ofmarker_en;
break;
default:
return ISCSI_ERR_PARAM_NOT_FOUND;
}
return 0;
}
static void
iscsi_conn_get_stats(iscsi_connh_t connh, struct iscsi_stats *stats)
{
struct iscsi_conn *conn = iscsi_ptr(connh);
stats->txdata_octets = conn->txdata_octets;
stats->rxdata_octets = conn->rxdata_octets;
stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
stats->dataout_pdus = conn->dataout_pdus_cnt;
stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
stats->datain_pdus = conn->datain_pdus_cnt;
stats->r2t_pdus = conn->r2t_pdus_cnt;
stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
stats->custom_length = 3;
strcpy(stats->custom[0].desc, "tx_sendpage_failures");
stats->custom[0].value = conn->sendpage_failures_cnt;
strcpy(stats->custom[1].desc, "rx_discontiguous_hdr");
stats->custom[1].value = conn->discontiguous_hdr_cnt;
strcpy(stats->custom[2].desc, "eh_abort_cnt");
stats->custom[2].value = conn->eh_abort_cnt;
}
static int
iscsi_conn_send_pdu(iscsi_connh_t connh, struct iscsi_hdr *hdr, char *data,
uint32_t data_size)
{
struct iscsi_conn *conn = iscsi_ptr(connh);
int rc;
down(&conn->xmitsema);
rc = iscsi_conn_send_generic(conn, hdr, data, data_size);
up(&conn->xmitsema);
return rc;
}
static struct iscsi_transport iscsi_tcp_transport = {
.owner = THIS_MODULE,
.name = "tcp",
.caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST
| CAP_DATADGST,
.host_template = &iscsi_sht,
.hostdata_size = sizeof(struct iscsi_session),
.max_conn = 1,
.max_cmd_len = ISCSI_TCP_MAX_CMD_LEN,
.create_session = iscsi_session_create,
.destroy_session = iscsi_session_destroy,
.create_conn = iscsi_conn_create,
.bind_conn = iscsi_conn_bind,
.destroy_conn = iscsi_conn_destroy,
.set_param = iscsi_conn_set_param,
.get_param = iscsi_conn_get_param,
.start_conn = iscsi_conn_start,
.stop_conn = iscsi_conn_stop,
.send_pdu = iscsi_conn_send_pdu,
.get_stats = iscsi_conn_get_stats,
};
static int __init
iscsi_tcp_init(void)
{
int error;
if (iscsi_max_lun < 1) {
printk(KERN_ERR "Invalid max_lun value of %u\n", iscsi_max_lun);
return -EINVAL;
}
iscsi_tcp_transport.max_lun = iscsi_max_lun;
taskcache = kmem_cache_create("iscsi_taskcache",
sizeof(struct iscsi_data_task), 0,
SLAB_HWCACHE_ALIGN | SLAB_NO_REAP, NULL, NULL);
if (!taskcache)
return -ENOMEM;
error = iscsi_register_transport(&iscsi_tcp_transport);
if (error)
kmem_cache_destroy(taskcache);
return error;
}
static void __exit
iscsi_tcp_exit(void)
{
iscsi_unregister_transport(&iscsi_tcp_transport);
kmem_cache_destroy(taskcache);
}
module_init(iscsi_tcp_init);
module_exit(iscsi_tcp_exit);
/*
* iSCSI Initiator TCP Transport
* Copyright (C) 2004 Dmitry Yusupov
* Copyright (C) 2004 Alex Aizman
* Copyright (C) 2005 Mike Christie
* maintained by open-iscsi@googlegroups.com
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published
* by the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* See the file COPYING included with this distribution for more details.
*/
#ifndef ISCSI_TCP_H
#define ISCSI_TCP_H
/* Session's states */
#define ISCSI_STATE_FREE 1
#define ISCSI_STATE_LOGGED_IN 2
#define ISCSI_STATE_FAILED 3
#define ISCSI_STATE_TERMINATE 4
/* Connection's states */
#define ISCSI_CONN_INITIAL_STAGE 0
#define ISCSI_CONN_STARTED 1
#define ISCSI_CONN_STOPPED 2
#define ISCSI_CONN_CLEANUP_WAIT 3
/* Connection suspend "bit" */
#define SUSPEND_BIT 1
/* Socket's Receive state machine */
#define IN_PROGRESS_WAIT_HEADER 0x0
#define IN_PROGRESS_HEADER_GATHER 0x1
#define IN_PROGRESS_DATA_RECV 0x2
#define IN_PROGRESS_DDIGEST_RECV 0x3
/* Task Mgmt states */
#define TMABORT_INITIAL 0x0
#define TMABORT_SUCCESS 0x1
#define TMABORT_FAILED 0x2
#define TMABORT_TIMEDOUT 0x3
/* xmit state machine */
#define XMSTATE_IDLE 0x0
#define XMSTATE_R_HDR 0x1
#define XMSTATE_W_HDR 0x2
#define XMSTATE_IMM_HDR 0x4
#define XMSTATE_IMM_DATA 0x8
#define XMSTATE_UNS_INIT 0x10
#define XMSTATE_UNS_HDR 0x20
#define XMSTATE_UNS_DATA 0x40
#define XMSTATE_SOL_HDR 0x80
#define XMSTATE_SOL_DATA 0x100
#define XMSTATE_W_PAD 0x200
#define XMSTATE_DATA_DIGEST 0x400
#define ISCSI_CONN_MAX 1
#define ISCSI_CONN_RCVBUF_MIN 262144
#define ISCSI_CONN_SNDBUF_MIN 262144
#define ISCSI_PAD_LEN 4
#define ISCSI_R2T_MAX 16
#define ISCSI_XMIT_CMDS_MAX 128 /* must be power of 2 */
#define ISCSI_MGMT_CMDS_MAX 32 /* must be power of 2 */
#define ISCSI_MGMT_ITT_OFFSET 0xa00
#define ISCSI_SG_TABLESIZE SG_ALL
#define ISCSI_CMD_PER_LUN 128
#define ISCSI_TCP_MAX_CMD_LEN 16
#define ITT_MASK (0xfff)
#define CID_SHIFT 12
#define CID_MASK (0xffff<<CID_SHIFT)
#define AGE_SHIFT 28
#define AGE_MASK (0xf<<AGE_SHIFT)
struct iscsi_queue {
struct kfifo *queue; /* FIFO Queue */
void **pool; /* Pool of elements */
int max; /* Max number of elements */
};
struct iscsi_session;
struct iscsi_cmd_task;
struct iscsi_mgmt_task;
/* Socket connection recieve helper */
struct iscsi_tcp_recv {
struct iscsi_hdr *hdr;
struct sk_buff *skb;
int offset;
int len;
int hdr_offset;
int copy;
int copied;
int padding;
struct iscsi_cmd_task *ctask; /* current cmd in progress */
/* copied and flipped values */
int opcode;
int flags;
int cmd_status;
int ahslen;
int datalen;
uint32_t itt;
int datadgst;
};
struct iscsi_conn {
struct iscsi_hdr hdr; /* header placeholder */
char hdrext[4*sizeof(__u16) +
sizeof(__u32)];
int data_copied;
char *data; /* data placeholder */
struct socket *sock; /* TCP socket */
int data_size; /* actual recv_dlength */
int stop_stage; /* conn_stop() flag: *
* stop to recover, *
* stop to terminate */
/* iSCSI connection-wide sequencing */
uint32_t exp_statsn;
int hdr_size; /* PDU header size */
unsigned long suspend_rx; /* suspend Rx */
struct crypto_tfm *rx_tfm; /* CRC32C (Rx) */
struct crypto_tfm *data_rx_tfm; /* CRC32C (Rx) for data */
/* control data */
int senselen; /* scsi sense length */
int id; /* CID */
struct iscsi_tcp_recv in; /* TCP receive context */
struct iscsi_session *session; /* parent session */
struct list_head item; /* maintains list of conns */
int in_progress; /* connection state machine */
int c_stage; /* connection state */
struct iscsi_mgmt_task *login_mtask; /* mtask used for login/text */
struct iscsi_mgmt_task *mtask; /* xmit mtask in progress */
struct iscsi_cmd_task *ctask; /* xmit ctask in progress */
spinlock_t lock; /* FIXME: to be removed */
/* old values for socket callbacks */
void (*old_data_ready)(struct sock *, int);
void (*old_state_change)(struct sock *);
void (*old_write_space)(struct sock *);
/* xmit */
struct crypto_tfm *tx_tfm; /* CRC32C (Tx) */
struct crypto_tfm *data_tx_tfm; /* CRC32C (Tx) for data */
struct kfifo *writequeue; /* write cmds for Data-Outs */
struct kfifo *immqueue; /* immediate xmit queue */
struct kfifo *mgmtqueue; /* mgmt (control) xmit queue */
struct kfifo *xmitqueue; /* data-path cmd queue */
struct work_struct xmitwork; /* per-conn. xmit workqueue */
struct semaphore xmitsema; /* serializes connection xmit,
* access to kfifos: *
* xmitqueue, writequeue, *
* immqueue, mgmtqueue */
unsigned long suspend_tx; /* suspend Tx */
/* abort */
wait_queue_head_t ehwait; /* used in eh_abort() */
struct iscsi_tm tmhdr;
struct timer_list tmabort_timer; /* abort timer */
int tmabort_state; /* see TMABORT_INITIAL, etc.*/
/* negotiated params */
int max_recv_dlength;
int max_xmit_dlength;
int hdrdgst_en;
int datadgst_en;
/* MIB-statistics */
uint64_t txdata_octets;
uint64_t rxdata_octets;
uint32_t scsicmd_pdus_cnt;
uint32_t dataout_pdus_cnt;
uint32_t scsirsp_pdus_cnt;
uint32_t datain_pdus_cnt;
uint32_t r2t_pdus_cnt;
uint32_t tmfcmd_pdus_cnt;
int32_t tmfrsp_pdus_cnt;
/* custom statistics */
uint32_t sendpage_failures_cnt;
uint32_t discontiguous_hdr_cnt;
uint32_t eh_abort_cnt;
};
struct iscsi_session {
/* iSCSI session-wide sequencing */
uint32_t cmdsn;
uint32_t exp_cmdsn;
uint32_t max_cmdsn;
/* configuration */
int initial_r2t_en;
int max_r2t;
int imm_data_en;
int first_burst;
int max_burst;
int time2wait;
int time2retain;
int pdu_inorder_en;
int dataseq_inorder_en;
int erl;
int ifmarker_en;
int ofmarker_en;
/* control data */
struct Scsi_Host *host;
int id;
struct iscsi_conn *leadconn; /* leading connection */
spinlock_t lock; /* protects session state, *
* sequence numbers, *
* session resources: *
* - cmdpool, *
* - mgmtpool, *
* - r2tpool */
int state; /* session state */
struct list_head item;
void *auth_client;
int conn_cnt;
int age; /* counts session re-opens */
struct list_head connections; /* list of connections */
int cmds_max; /* size of cmds array */
struct iscsi_cmd_task **cmds; /* Original Cmds arr */
struct iscsi_queue cmdpool; /* PDU's pool */
int mgmtpool_max; /* size of mgmt array */
struct iscsi_mgmt_task **mgmt_cmds; /* Original mgmt arr */
struct iscsi_queue mgmtpool; /* Mgmt PDU's pool */
};
struct iscsi_buf {
struct scatterlist sg;
struct kvec iov;
unsigned int sent;
};
struct iscsi_data_task {
struct iscsi_data hdr; /* PDU */
char hdrext[sizeof(__u32)]; /* Header-Digest */
struct list_head item; /* data queue item */
struct iscsi_buf digestbuf; /* digest buffer */
uint32_t digest; /* data digest */
};
#define ISCSI_DTASK_DEFAULT_MAX ISCSI_SG_TABLESIZE * PAGE_SIZE / 512
struct iscsi_mgmt_task {
struct iscsi_hdr hdr; /* mgmt. PDU */
char hdrext[sizeof(__u32)]; /* Header-Digest */
char *data; /* mgmt payload */
int xmstate; /* mgmt xmit progress */
int data_count; /* counts data to be sent */
struct iscsi_buf headbuf; /* header buffer */
struct iscsi_buf sendbuf; /* in progress buffer */
int sent;
uint32_t itt; /* this ITT */
};
struct iscsi_r2t_info {
__be32 ttt; /* copied from R2T */
__be32 exp_statsn; /* copied from R2T */
uint32_t data_length; /* copied from R2T */
uint32_t data_offset; /* copied from R2T */
struct iscsi_buf headbuf; /* Data-Out Header Buffer */
struct iscsi_buf sendbuf; /* Data-Out in progress buffer*/
int sent; /* R2T sequence progress */
int data_count; /* DATA-Out payload progress */
struct scatterlist *sg; /* per-R2T SG list */
int solicit_datasn;
struct iscsi_data_task *dtask; /* which data task */
};
struct iscsi_cmd_task {
struct iscsi_cmd hdr; /* iSCSI PDU header */
char hdrext[4*sizeof(__u16)+ /* AHS */
sizeof(__u32)]; /* HeaderDigest */
char pad[ISCSI_PAD_LEN];
int itt; /* this ITT */
int datasn; /* DataSN */
struct iscsi_buf headbuf; /* header buf (xmit) */
struct iscsi_buf sendbuf; /* in progress buffer*/
int sent;
struct scatterlist *sg; /* per-cmd SG list */
struct scatterlist *bad_sg; /* assert statement */
int sg_count; /* SG's to process */
uint32_t unsol_datasn;
uint32_t exp_r2tsn;
int xmstate; /* xmit xtate machine */
int imm_count; /* imm-data (bytes) */
int unsol_count; /* unsolicited (bytes)*/
int r2t_data_count; /* R2T Data-Out bytes */
int data_count; /* remaining Data-Out */
int pad_count; /* padded bytes */
struct scsi_cmnd *sc; /* associated SCSI cmd*/
int total_length;
int data_offset;
struct iscsi_conn *conn; /* used connection */
struct iscsi_mgmt_task *mtask; /* tmf mtask in progr */
struct iscsi_r2t_info *r2t; /* in progress R2T */
struct iscsi_queue r2tpool;
struct kfifo *r2tqueue;
struct iscsi_r2t_info **r2ts;
struct list_head dataqueue; /* Data-Out dataqueue */
mempool_t *datapool;
uint32_t datadigest; /* for recover digest */
int digest_count;
uint32_t immdigest; /* for imm data */
struct iscsi_buf immbuf; /* for imm data digest */
struct iscsi_data_task *dtask; /* data task in progress*/
int digest_offset; /* for partial buff digest */
};
#endif /* ISCSI_H */
...@@ -3481,8 +3481,8 @@ static int ncr_queue_command (struct ncb *np, struct scsi_cmnd *cmd) ...@@ -3481,8 +3481,8 @@ static int ncr_queue_command (struct ncb *np, struct scsi_cmnd *cmd)
**---------------------------------------------------- **----------------------------------------------------
*/ */
if (np->settle_time && cmd->timeout_per_command >= HZ) { if (np->settle_time && cmd->timeout_per_command >= HZ) {
u_long tlimit = ktime_get(cmd->timeout_per_command - HZ); u_long tlimit = jiffies + cmd->timeout_per_command - HZ;
if (ktime_dif(np->settle_time, tlimit) > 0) if (time_after(np->settle_time, tlimit))
np->settle_time = tlimit; np->settle_time = tlimit;
} }
...@@ -3516,7 +3516,7 @@ static int ncr_queue_command (struct ncb *np, struct scsi_cmnd *cmd) ...@@ -3516,7 +3516,7 @@ static int ncr_queue_command (struct ncb *np, struct scsi_cmnd *cmd)
** Force ordered tag if necessary to avoid timeouts ** Force ordered tag if necessary to avoid timeouts
** and to preserve interactivity. ** and to preserve interactivity.
*/ */
if (lp && ktime_exp(lp->tags_stime)) { if (lp && time_after(jiffies, lp->tags_stime)) {
if (lp->tags_smap) { if (lp->tags_smap) {
order = M_ORDERED_TAG; order = M_ORDERED_TAG;
if ((DEBUG_FLAGS & DEBUG_TAGS)||bootverbose>2){ if ((DEBUG_FLAGS & DEBUG_TAGS)||bootverbose>2){
...@@ -3524,7 +3524,7 @@ static int ncr_queue_command (struct ncb *np, struct scsi_cmnd *cmd) ...@@ -3524,7 +3524,7 @@ static int ncr_queue_command (struct ncb *np, struct scsi_cmnd *cmd)
"ordered tag forced.\n"); "ordered tag forced.\n");
} }
} }
lp->tags_stime = ktime_get(3*HZ); lp->tags_stime = jiffies + 3*HZ;
lp->tags_smap = lp->tags_umap; lp->tags_smap = lp->tags_umap;
} }
...@@ -3792,7 +3792,7 @@ static int ncr_reset_scsi_bus(struct ncb *np, int enab_int, int settle_delay) ...@@ -3792,7 +3792,7 @@ static int ncr_reset_scsi_bus(struct ncb *np, int enab_int, int settle_delay)
u32 term; u32 term;
int retv = 0; int retv = 0;
np->settle_time = ktime_get(settle_delay * HZ); np->settle_time = jiffies + settle_delay * HZ;
if (bootverbose > 1) if (bootverbose > 1)
printk("%s: resetting, " printk("%s: resetting, "
...@@ -5044,7 +5044,7 @@ static void ncr_setup_tags (struct ncb *np, struct scsi_device *sdev) ...@@ -5044,7 +5044,7 @@ static void ncr_setup_tags (struct ncb *np, struct scsi_device *sdev)
static void ncr_timeout (struct ncb *np) static void ncr_timeout (struct ncb *np)
{ {
u_long thistime = ktime_get(0); u_long thistime = jiffies;
/* /*
** If release process in progress, let's go ** If release process in progress, let's go
...@@ -5057,7 +5057,7 @@ static void ncr_timeout (struct ncb *np) ...@@ -5057,7 +5057,7 @@ static void ncr_timeout (struct ncb *np)
return; return;
} }
np->timer.expires = ktime_get(SCSI_NCR_TIMER_INTERVAL); np->timer.expires = jiffies + SCSI_NCR_TIMER_INTERVAL;
add_timer(&np->timer); add_timer(&np->timer);
/* /*
...@@ -5336,8 +5336,8 @@ void ncr_exception (struct ncb *np) ...@@ -5336,8 +5336,8 @@ void ncr_exception (struct ncb *np)
**========================================================= **=========================================================
*/ */
if (ktime_exp(np->regtime)) { if (time_after(jiffies, np->regtime)) {
np->regtime = ktime_get(10*HZ); np->regtime = jiffies + 10*HZ;
for (i = 0; i<sizeof(np->regdump); i++) for (i = 0; i<sizeof(np->regdump); i++)
((char*)&np->regdump)[i] = INB_OFF(i); ((char*)&np->regdump)[i] = INB_OFF(i);
np->regdump.nc_dstat = dstat; np->regdump.nc_dstat = dstat;
...@@ -5453,7 +5453,7 @@ static int ncr_int_sbmc (struct ncb *np) ...@@ -5453,7 +5453,7 @@ static int ncr_int_sbmc (struct ncb *np)
** Suspend command processing for 1 second and ** Suspend command processing for 1 second and
** reinitialize all except the chip. ** reinitialize all except the chip.
*/ */
np->settle_time = ktime_get(1*HZ); np->settle_time = jiffies + HZ;
ncr_init (np, 0, bootverbose ? "scsi mode change" : NULL, HS_RESET); ncr_init (np, 0, bootverbose ? "scsi mode change" : NULL, HS_RESET);
return 1; return 1;
} }
...@@ -6923,7 +6923,7 @@ static struct lcb *ncr_setup_lcb (struct ncb *np, struct scsi_device *sdev) ...@@ -6923,7 +6923,7 @@ static struct lcb *ncr_setup_lcb (struct ncb *np, struct scsi_device *sdev)
for (i = 0 ; i < MAX_TAGS ; i++) for (i = 0 ; i < MAX_TAGS ; i++)
lp->cb_tags[i] = i; lp->cb_tags[i] = i;
lp->maxnxs = MAX_TAGS; lp->maxnxs = MAX_TAGS;
lp->tags_stime = ktime_get(3*HZ); lp->tags_stime = jiffies + 3*HZ;
ncr_setup_tags (np, sdev); ncr_setup_tags (np, sdev);
} }
......
/* /*
* iSCSI transport class definitions * iSCSI transport class definitions
* *
* Copyright (C) IBM Corporation, 2004 * Copyright (C) IBM Corporation, 2004
* Copyright (C) Mike Christie, 2004 * Copyright (C) Mike Christie, 2004 - 2005
* Copyright (C) Dmitry Yusupov, 2004 - 2005
* Copyright (C) Alex Aizman, 2004 - 2005
* *
* This program is free software; you can redistribute it and/or modify * This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by * it under the terms of the GNU General Public License as published by
...@@ -19,370 +21,1254 @@ ...@@ -19,370 +21,1254 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/ */
#include <linux/module.h> #include <linux/module.h>
#include <linux/mempool.h>
#include <net/tcp.h>
#include <scsi/scsi.h> #include <scsi/scsi.h>
#include <scsi/scsi_host.h> #include <scsi/scsi_host.h>
#include <scsi/scsi_device.h> #include <scsi/scsi_device.h>
#include <scsi/scsi_transport.h> #include <scsi/scsi_transport.h>
#include <scsi/scsi_transport_iscsi.h> #include <scsi/scsi_transport_iscsi.h>
#include <scsi/iscsi_if.h>
#define ISCSI_SESSION_ATTRS 20 #define ISCSI_SESSION_ATTRS 8
#define ISCSI_HOST_ATTRS 2 #define ISCSI_CONN_ATTRS 6
struct iscsi_internal { struct iscsi_internal {
struct scsi_transport_template t; struct scsi_transport_template t;
struct iscsi_function_template *fnt; struct iscsi_transport *iscsi_transport;
struct list_head list;
/*
* List of sessions for this transport
*/
struct list_head sessions;
/*
* lock to serialize access to the sessions list which must
* be taken after the rx_queue_sema
*/
spinlock_t session_lock;
/*
* based on transport capabilities, at register time we set these
* bits to tell the transport class it wants attributes displayed
* in sysfs or that it can support different iSCSI Data-Path
* capabilities
*/
uint32_t param_mask;
struct class_device cdev;
/* /*
* We do not have any private or other attrs. * We do not have any private or other attrs.
*/ */
struct transport_container conn_cont;
struct class_device_attribute *conn_attrs[ISCSI_CONN_ATTRS + 1];
struct transport_container session_cont;
struct class_device_attribute *session_attrs[ISCSI_SESSION_ATTRS + 1]; struct class_device_attribute *session_attrs[ISCSI_SESSION_ATTRS + 1];
struct class_device_attribute *host_attrs[ISCSI_HOST_ATTRS + 1];
}; };
#define to_iscsi_internal(tmpl) container_of(tmpl, struct iscsi_internal, t) /*
* list of registered transports and lock that must
* be held while accessing list. The iscsi_transport_lock must
* be acquired after the rx_queue_sema.
*/
static LIST_HEAD(iscsi_transports);
static DEFINE_SPINLOCK(iscsi_transport_lock);
#define to_iscsi_internal(tmpl) \
container_of(tmpl, struct iscsi_internal, t)
#define cdev_to_iscsi_internal(_cdev) \
container_of(_cdev, struct iscsi_internal, cdev)
static void iscsi_transport_release(struct class_device *cdev)
{
struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev);
kfree(priv);
}
static DECLARE_TRANSPORT_CLASS(iscsi_transport_class, /*
"iscsi_transport", * iscsi_transport_class represents the iscsi_transports that are
* registered.
*/
static struct class iscsi_transport_class = {
.name = "iscsi_transport",
.release = iscsi_transport_release,
};
static ssize_t
show_transport_handle(struct class_device *cdev, char *buf)
{
struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev);
return sprintf(buf, "%llu\n", (unsigned long long)iscsi_handle(priv->iscsi_transport));
}
static CLASS_DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL);
#define show_transport_attr(name, format) \
static ssize_t \
show_transport_##name(struct class_device *cdev, char *buf) \
{ \
struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev); \
return sprintf(buf, format"\n", priv->iscsi_transport->name); \
} \
static CLASS_DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
show_transport_attr(caps, "0x%x");
show_transport_attr(max_lun, "%d");
show_transport_attr(max_conn, "%d");
show_transport_attr(max_cmd_len, "%d");
static struct attribute *iscsi_transport_attrs[] = {
&class_device_attr_handle.attr,
&class_device_attr_caps.attr,
&class_device_attr_max_lun.attr,
&class_device_attr_max_conn.attr,
&class_device_attr_max_cmd_len.attr,
NULL,
};
static struct attribute_group iscsi_transport_group = {
.attrs = iscsi_transport_attrs,
};
static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
"iscsi_session",
NULL, NULL,
NULL, NULL,
NULL); NULL);
static DECLARE_TRANSPORT_CLASS(iscsi_host_class, static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
"iscsi_host", "iscsi_connection",
NULL, NULL,
NULL, NULL,
NULL); NULL);
static struct sock *nls;
static int daemon_pid;
static DECLARE_MUTEX(rx_queue_sema);
struct mempool_zone {
mempool_t *pool;
atomic_t allocated;
int size;
int hiwat;
struct list_head freequeue;
spinlock_t freelock;
};
static struct mempool_zone z_reply;
/* /*
* iSCSI target and session attrs * Z_MAX_* - actual mempool size allocated at the mempool_zone_init() time
* Z_HIWAT_* - zone's high watermark when if_error bit will be set to -ENOMEM
* so daemon will notice OOM on NETLINK tranposrt level and will
* be able to predict or change operational behavior
*/ */
#define iscsi_session_show_fn(field, format) \ #define Z_MAX_REPLY 8
\ #define Z_HIWAT_REPLY 6
static ssize_t \ #define Z_MAX_PDU 8
show_session_##field(struct class_device *cdev, char *buf) \ #define Z_HIWAT_PDU 6
{ \ #define Z_MAX_ERROR 16
struct scsi_target *starget = transport_class_to_starget(cdev); \ #define Z_HIWAT_ERROR 12
struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \
struct iscsi_internal *i = to_iscsi_internal(shost->transportt); \ struct iscsi_if_conn {
\ struct list_head conn_list; /* item in connlist */
if (i->fnt->get_##field) \ struct list_head session_list; /* item in session->connections */
i->fnt->get_##field(starget); \ iscsi_connh_t connh;
return snprintf(buf, 20, format"\n", iscsi_##field(starget)); \ int active; /* must be accessed with the connlock */
struct Scsi_Host *host; /* originated shost */
struct device dev; /* sysfs transport/container device */
struct iscsi_transport *transport;
struct mempool_zone z_error;
struct mempool_zone z_pdu;
struct list_head freequeue;
};
#define iscsi_dev_to_if_conn(_dev) \
container_of(_dev, struct iscsi_if_conn, dev)
#define iscsi_cdev_to_if_conn(_cdev) \
iscsi_dev_to_if_conn(_cdev->dev)
static LIST_HEAD(connlist);
static DEFINE_SPINLOCK(connlock);
struct iscsi_if_session {
struct list_head list; /* item in session_list */
struct list_head connections;
iscsi_sessionh_t sessionh;
struct iscsi_transport *transport;
struct device dev; /* sysfs transport/container device */
};
#define iscsi_dev_to_if_session(_dev) \
container_of(_dev, struct iscsi_if_session, dev)
#define iscsi_cdev_to_if_session(_cdev) \
iscsi_dev_to_if_session(_cdev->dev)
#define iscsi_if_session_to_shost(_session) \
dev_to_shost(_session->dev.parent)
static struct iscsi_if_conn*
iscsi_if_find_conn(uint64_t key)
{
unsigned long flags;
struct iscsi_if_conn *conn;
spin_lock_irqsave(&connlock, flags);
list_for_each_entry(conn, &connlist, conn_list)
if (conn->connh == key) {
spin_unlock_irqrestore(&connlock, flags);
return conn;
}
spin_unlock_irqrestore(&connlock, flags);
return NULL;
} }
#define iscsi_session_rd_attr(field, format) \ static struct iscsi_internal *
iscsi_session_show_fn(field, format) \ iscsi_if_transport_lookup(struct iscsi_transport *tt)
static CLASS_DEVICE_ATTR(field, S_IRUGO, show_session_##field, NULL); {
struct iscsi_internal *priv;
unsigned long flags;
spin_lock_irqsave(&iscsi_transport_lock, flags);
list_for_each_entry(priv, &iscsi_transports, list) {
if (tt == priv->iscsi_transport) {
spin_unlock_irqrestore(&iscsi_transport_lock, flags);
return priv;
}
}
spin_unlock_irqrestore(&iscsi_transport_lock, flags);
return NULL;
}
iscsi_session_rd_attr(tpgt, "%hu"); static inline struct list_head *skb_to_lh(struct sk_buff *skb)
iscsi_session_rd_attr(tsih, "%2x"); {
iscsi_session_rd_attr(max_recv_data_segment_len, "%u"); return (struct list_head *)&skb->cb;
iscsi_session_rd_attr(max_burst_len, "%u"); }
iscsi_session_rd_attr(first_burst_len, "%u");
iscsi_session_rd_attr(def_time2wait, "%hu");
iscsi_session_rd_attr(def_time2retain, "%hu");
iscsi_session_rd_attr(max_outstanding_r2t, "%hu");
iscsi_session_rd_attr(erl, "%d");
static void*
mempool_zone_alloc_skb(unsigned int gfp_mask, void *pool_data)
{
struct mempool_zone *zone = pool_data;
#define iscsi_session_show_bool_fn(field) \ return alloc_skb(zone->size, gfp_mask);
\
static ssize_t \
show_session_bool_##field(struct class_device *cdev, char *buf) \
{ \
struct scsi_target *starget = transport_class_to_starget(cdev); \
struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \
struct iscsi_internal *i = to_iscsi_internal(shost->transportt); \
\
if (i->fnt->get_##field) \
i->fnt->get_##field(starget); \
\
if (iscsi_##field(starget)) \
return sprintf(buf, "Yes\n"); \
return sprintf(buf, "No\n"); \
} }
#define iscsi_session_rd_bool_attr(field) \ static void
iscsi_session_show_bool_fn(field) \ mempool_zone_free_skb(void *element, void *pool_data)
static CLASS_DEVICE_ATTR(field, S_IRUGO, show_session_bool_##field, NULL); {
kfree_skb(element);
}
iscsi_session_rd_bool_attr(initial_r2t); static void
iscsi_session_rd_bool_attr(immediate_data); mempool_zone_complete(struct mempool_zone *zone)
iscsi_session_rd_bool_attr(data_pdu_in_order); {
iscsi_session_rd_bool_attr(data_sequence_in_order); unsigned long flags;
struct list_head *lh, *n;
#define iscsi_session_show_digest_fn(field) \ spin_lock_irqsave(&zone->freelock, flags);
\ list_for_each_safe(lh, n, &zone->freequeue) {
static ssize_t \ struct sk_buff *skb = (struct sk_buff *)((char *)lh -
show_##field(struct class_device *cdev, char *buf) \ offsetof(struct sk_buff, cb));
{ \ if (!skb_shared(skb)) {
struct scsi_target *starget = transport_class_to_starget(cdev); \ list_del(skb_to_lh(skb));
struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \ mempool_free(skb, zone->pool);
struct iscsi_internal *i = to_iscsi_internal(shost->transportt); \ atomic_dec(&zone->allocated);
\ }
if (i->fnt->get_##field) \ }
i->fnt->get_##field(starget); \ spin_unlock_irqrestore(&zone->freelock, flags);
\
if (iscsi_##field(starget)) \
return sprintf(buf, "CRC32C\n"); \
return sprintf(buf, "None\n"); \
} }
#define iscsi_session_rd_digest_attr(field) \ static int
iscsi_session_show_digest_fn(field) \ mempool_zone_init(struct mempool_zone *zp, unsigned max, unsigned size,
static CLASS_DEVICE_ATTR(field, S_IRUGO, show_##field, NULL); unsigned hiwat)
{
zp->pool = mempool_create(max, mempool_zone_alloc_skb,
mempool_zone_free_skb, zp);
if (!zp->pool)
return -ENOMEM;
iscsi_session_rd_digest_attr(header_digest); zp->size = size;
iscsi_session_rd_digest_attr(data_digest); zp->hiwat = hiwat;
static ssize_t INIT_LIST_HEAD(&zp->freequeue);
show_port(struct class_device *cdev, char *buf) spin_lock_init(&zp->freelock);
atomic_set(&zp->allocated, 0);
return 0;
}
static struct sk_buff*
mempool_zone_get_skb(struct mempool_zone *zone)
{ {
struct scsi_target *starget = transport_class_to_starget(cdev); struct sk_buff *skb;
struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
struct iscsi_internal *i = to_iscsi_internal(shost->transportt); skb = mempool_alloc(zone->pool, GFP_ATOMIC);
if (skb)
atomic_inc(&zone->allocated);
return skb;
}
if (i->fnt->get_port) static int
i->fnt->get_port(starget); iscsi_unicast_skb(struct mempool_zone *zone, struct sk_buff *skb)
{
unsigned long flags;
int rc;
return snprintf(buf, 20, "%hu\n", ntohs(iscsi_port(starget))); skb_get(skb);
rc = netlink_unicast(nls, skb, daemon_pid, MSG_DONTWAIT);
if (rc < 0) {
mempool_free(skb, zone->pool);
printk(KERN_ERR "iscsi: can not unicast skb (%d)\n", rc);
return rc;
}
spin_lock_irqsave(&zone->freelock, flags);
list_add(skb_to_lh(skb), &zone->freequeue);
spin_unlock_irqrestore(&zone->freelock, flags);
return 0;
} }
static CLASS_DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
static ssize_t int iscsi_recv_pdu(iscsi_connh_t connh, struct iscsi_hdr *hdr,
show_ip_address(struct class_device *cdev, char *buf) char *data, uint32_t data_size)
{ {
struct scsi_target *starget = transport_class_to_starget(cdev); struct nlmsghdr *nlh;
struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); struct sk_buff *skb;
struct iscsi_internal *i = to_iscsi_internal(shost->transportt); struct iscsi_uevent *ev;
struct iscsi_if_conn *conn;
char *pdu;
int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) +
data_size);
conn = iscsi_if_find_conn(connh);
BUG_ON(!conn);
mempool_zone_complete(&conn->z_pdu);
skb = mempool_zone_get_skb(&conn->z_pdu);
if (!skb) {
iscsi_conn_error(connh, ISCSI_ERR_CONN_FAILED);
printk(KERN_ERR "iscsi%d: can not deliver control PDU: OOM\n",
conn->host->host_no);
return -ENOMEM;
}
if (i->fnt->get_ip_address) nlh = __nlmsg_put(skb, daemon_pid, 0, 0, (len - sizeof(*nlh)), 0);
i->fnt->get_ip_address(starget); ev = NLMSG_DATA(nlh);
memset(ev, 0, sizeof(*ev));
ev->transport_handle = iscsi_handle(conn->transport);
ev->type = ISCSI_KEVENT_RECV_PDU;
if (atomic_read(&conn->z_pdu.allocated) >= conn->z_pdu.hiwat)
ev->iferror = -ENOMEM;
ev->r.recv_req.conn_handle = connh;
pdu = (char*)ev + sizeof(*ev);
memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
if (iscsi_addr_type(starget) == AF_INET) return iscsi_unicast_skb(&conn->z_pdu, skb);
return sprintf(buf, "%u.%u.%u.%u\n",
NIPQUAD(iscsi_sin_addr(starget)));
else if(iscsi_addr_type(starget) == AF_INET6)
return sprintf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
NIP6(iscsi_sin6_addr(starget)));
return -EINVAL;
} }
static CLASS_DEVICE_ATTR(ip_address, S_IRUGO, show_ip_address, NULL); EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
static ssize_t void iscsi_conn_error(iscsi_connh_t connh, enum iscsi_err error)
show_isid(struct class_device *cdev, char *buf)
{ {
struct scsi_target *starget = transport_class_to_starget(cdev); struct nlmsghdr *nlh;
struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); struct sk_buff *skb;
struct iscsi_internal *i = to_iscsi_internal(shost->transportt); struct iscsi_uevent *ev;
struct iscsi_if_conn *conn;
int len = NLMSG_SPACE(sizeof(*ev));
conn = iscsi_if_find_conn(connh);
BUG_ON(!conn);
mempool_zone_complete(&conn->z_error);
skb = mempool_zone_get_skb(&conn->z_error);
if (!skb) {
printk(KERN_ERR "iscsi%d: gracefully ignored conn error (%d)\n",
conn->host->host_no, error);
return;
}
nlh = __nlmsg_put(skb, daemon_pid, 0, 0, (len - sizeof(*nlh)), 0);
ev = NLMSG_DATA(nlh);
ev->transport_handle = iscsi_handle(conn->transport);
ev->type = ISCSI_KEVENT_CONN_ERROR;
if (atomic_read(&conn->z_error.allocated) >= conn->z_error.hiwat)
ev->iferror = -ENOMEM;
ev->r.connerror.error = error;
ev->r.connerror.conn_handle = connh;
if (i->fnt->get_isid) iscsi_unicast_skb(&conn->z_error, skb);
i->fnt->get_isid(starget);
return sprintf(buf, "%02x%02x%02x%02x%02x%02x\n", printk(KERN_INFO "iscsi%d: detected conn error (%d)\n",
iscsi_isid(starget)[0], iscsi_isid(starget)[1], conn->host->host_no, error);
iscsi_isid(starget)[2], iscsi_isid(starget)[3], }
iscsi_isid(starget)[4], iscsi_isid(starget)[5]); EXPORT_SYMBOL_GPL(iscsi_conn_error);
static int
iscsi_if_send_reply(int pid, int seq, int type, int done, int multi,
void *payload, int size)
{
struct sk_buff *skb;
struct nlmsghdr *nlh;
int len = NLMSG_SPACE(size);
int flags = multi ? NLM_F_MULTI : 0;
int t = done ? NLMSG_DONE : type;
mempool_zone_complete(&z_reply);
skb = mempool_zone_get_skb(&z_reply);
/*
* FIXME:
* user is supposed to react on iferror == -ENOMEM;
* see iscsi_if_rx().
*/
BUG_ON(!skb);
nlh = __nlmsg_put(skb, pid, seq, t, (len - sizeof(*nlh)), 0);
nlh->nlmsg_flags = flags;
memcpy(NLMSG_DATA(nlh), payload, size);
return iscsi_unicast_skb(&z_reply, skb);
} }
static CLASS_DEVICE_ATTR(isid, S_IRUGO, show_isid, NULL);
/* /*
* This is used for iSCSI names. Normally, we follow * iSCSI Session's hostdata organization:
* the transport class convention of having the lld *
* set the field, but in these cases the value is * *------------------* <== host->hostdata
* too large. * | transport |
* |------------------| <== iscsi_hostdata(host->hostdata)
* | transport's data |
* |------------------| <== hostdata_session(host->hostdata)
* | interface's data |
* *------------------*
*/ */
#define iscsi_session_show_str_fn(field) \
\ #define hostdata_privsize(_t) (sizeof(unsigned long) + _t->hostdata_size + \
static ssize_t \ _t->hostdata_size % sizeof(unsigned long) + \
show_session_str_##field(struct class_device *cdev, char *buf) \ sizeof(struct iscsi_if_session))
{ \
ssize_t ret = 0; \ #define hostdata_session(_hostdata) ((void*)_hostdata + sizeof(unsigned long) + \
struct scsi_target *starget = transport_class_to_starget(cdev); \ ((struct iscsi_transport *) \
struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \ iscsi_ptr(*(uint64_t *)_hostdata))->hostdata_size)
struct iscsi_internal *i = to_iscsi_internal(shost->transportt); \
\ static void iscsi_if_session_dev_release(struct device *dev)
if (i->fnt->get_##field) \ {
ret = i->fnt->get_##field(starget, buf, PAGE_SIZE); \ struct iscsi_if_session *session = iscsi_dev_to_if_session(dev);
return ret; \ struct iscsi_transport *transport = session->transport;
struct Scsi_Host *shost = iscsi_if_session_to_shost(session);
struct iscsi_if_conn *conn, *tmp;
unsigned long flags;
/* now free connections */
spin_lock_irqsave(&connlock, flags);
list_for_each_entry_safe(conn, tmp, &session->connections,
session_list) {
list_del(&conn->session_list);
mempool_destroy(conn->z_pdu.pool);
mempool_destroy(conn->z_error.pool);
kfree(conn);
}
spin_unlock_irqrestore(&connlock, flags);
scsi_host_put(shost);
module_put(transport->owner);
}
static int
iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_uevent *ev)
{
struct iscsi_transport *transport = priv->iscsi_transport;
struct iscsi_if_session *session;
struct Scsi_Host *shost;
unsigned long flags;
int error;
if (!try_module_get(transport->owner))
return -EPERM;
shost = scsi_host_alloc(transport->host_template,
hostdata_privsize(transport));
if (!shost) {
ev->r.c_session_ret.session_handle = iscsi_handle(NULL);
printk(KERN_ERR "iscsi: can not allocate SCSI host for "
"session\n");
error = -ENOMEM;
goto out_module_put;
}
shost->max_id = 1;
shost->max_channel = 0;
shost->max_lun = transport->max_lun;
shost->max_cmd_len = transport->max_cmd_len;
shost->transportt = &priv->t;
/* store struct iscsi_transport in hostdata */
*(uint64_t*)shost->hostdata = ev->transport_handle;
ev->r.c_session_ret.session_handle = transport->create_session(
ev->u.c_session.initial_cmdsn, shost);
if (ev->r.c_session_ret.session_handle == iscsi_handle(NULL)) {
error = 0;
goto out_host_put;
}
/* host_no becomes assigned SID */
ev->r.c_session_ret.sid = shost->host_no;
/* initialize session */
session = hostdata_session(shost->hostdata);
INIT_LIST_HEAD(&session->connections);
INIT_LIST_HEAD(&session->list);
session->sessionh = ev->r.c_session_ret.session_handle;
session->transport = transport;
error = scsi_add_host(shost, NULL);
if (error)
goto out_destroy_session;
/*
* this is released in the dev's release function)
*/
scsi_host_get(shost);
snprintf(session->dev.bus_id, BUS_ID_SIZE, "session%u", shost->host_no);
session->dev.parent = &shost->shost_gendev;
session->dev.release = iscsi_if_session_dev_release;
error = device_register(&session->dev);
if (error) {
printk(KERN_ERR "iscsi: could not register session%d's dev\n",
shost->host_no);
goto out_remove_host;
}
transport_register_device(&session->dev);
/* add this session to the list of active sessions */
spin_lock_irqsave(&priv->session_lock, flags);
list_add(&session->list, &priv->sessions);
spin_unlock_irqrestore(&priv->session_lock, flags);
return 0;
out_remove_host:
scsi_remove_host(shost);
out_destroy_session:
transport->destroy_session(ev->r.c_session_ret.session_handle);
ev->r.c_session_ret.session_handle = iscsi_handle(NULL);
out_host_put:
scsi_host_put(shost);
out_module_put:
module_put(transport->owner);
return error;
}
static int
iscsi_if_destroy_session(struct iscsi_internal *priv, struct iscsi_uevent *ev)
{
struct iscsi_transport *transport = priv->iscsi_transport;
struct Scsi_Host *shost;
struct iscsi_if_session *session;
unsigned long flags;
struct iscsi_if_conn *conn;
int error = 0;
shost = scsi_host_lookup(ev->u.d_session.sid);
if (shost == ERR_PTR(-ENXIO))
return -EEXIST;
session = hostdata_session(shost->hostdata);
/* check if we have active connections */
spin_lock_irqsave(&connlock, flags);
list_for_each_entry(conn, &session->connections, session_list) {
if (conn->active) {
printk(KERN_ERR "iscsi%d: can not destroy session: "
"has active connection (%p)\n",
shost->host_no, iscsi_ptr(conn->connh));
spin_unlock_irqrestore(&connlock, flags);
error = EIO;
goto out_release_ref;
}
}
spin_unlock_irqrestore(&connlock, flags);
scsi_remove_host(shost);
transport->destroy_session(ev->u.d_session.session_handle);
transport_unregister_device(&session->dev);
device_unregister(&session->dev);
/* remove this session from the list of active sessions */
spin_lock_irqsave(&priv->session_lock, flags);
list_del(&session->list);
spin_unlock_irqrestore(&priv->session_lock, flags);
/* ref from host alloc */
scsi_host_put(shost);
out_release_ref:
/* ref from host lookup */
scsi_host_put(shost);
return error;
}
static void iscsi_if_conn_dev_release(struct device *dev)
{
struct iscsi_if_conn *conn = iscsi_dev_to_if_conn(dev);
struct Scsi_Host *shost = conn->host;
scsi_host_put(shost);
}
static int
iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
{
struct iscsi_if_session *session;
struct Scsi_Host *shost;
struct iscsi_if_conn *conn;
unsigned long flags;
int error;
shost = scsi_host_lookup(ev->u.c_conn.sid);
if (shost == ERR_PTR(-ENXIO))
return -EEXIST;
session = hostdata_session(shost->hostdata);
conn = kmalloc(sizeof(struct iscsi_if_conn), GFP_KERNEL);
if (!conn) {
error = -ENOMEM;
goto out_release_ref;
}
memset(conn, 0, sizeof(struct iscsi_if_conn));
INIT_LIST_HEAD(&conn->session_list);
INIT_LIST_HEAD(&conn->conn_list);
conn->host = shost;
conn->transport = transport;
error = mempool_zone_init(&conn->z_pdu, Z_MAX_PDU,
NLMSG_SPACE(sizeof(struct iscsi_uevent) +
sizeof(struct iscsi_hdr) +
DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH),
Z_HIWAT_PDU);
if (error) {
printk(KERN_ERR "iscsi%d: can not allocate pdu zone for new "
"conn\n", shost->host_no);
goto out_free_conn;
}
error = mempool_zone_init(&conn->z_error, Z_MAX_ERROR,
NLMSG_SPACE(sizeof(struct iscsi_uevent)),
Z_HIWAT_ERROR);
if (error) {
printk(KERN_ERR "iscsi%d: can not allocate error zone for "
"new conn\n", shost->host_no);
goto out_free_pdu_pool;
}
ev->r.handle = transport->create_conn(ev->u.c_conn.session_handle,
ev->u.c_conn.cid);
if (!ev->r.handle) {
error = -ENODEV;
goto out_free_error_pool;
}
conn->connh = ev->r.handle;
/*
* this is released in the dev's release function
*/
if (!scsi_host_get(shost))
goto out_destroy_conn;
snprintf(conn->dev.bus_id, BUS_ID_SIZE, "connection%d:%u",
shost->host_no, ev->u.c_conn.cid);
conn->dev.parent = &session->dev;
conn->dev.release = iscsi_if_conn_dev_release;
error = device_register(&conn->dev);
if (error) {
printk(KERN_ERR "iscsi%d: could not register connections%u "
"dev\n", shost->host_no, ev->u.c_conn.cid);
goto out_release_parent_ref;
}
transport_register_device(&conn->dev);
spin_lock_irqsave(&connlock, flags);
list_add(&conn->conn_list, &connlist);
list_add(&conn->session_list, &session->connections);
conn->active = 1;
spin_unlock_irqrestore(&connlock, flags);
scsi_host_put(shost);
return 0;
out_release_parent_ref:
scsi_host_put(shost);
out_destroy_conn:
transport->destroy_conn(ev->r.handle);
out_free_error_pool:
mempool_destroy(conn->z_error.pool);
out_free_pdu_pool:
mempool_destroy(conn->z_pdu.pool);
out_free_conn:
kfree(conn);
out_release_ref:
scsi_host_put(shost);
return error;
} }
#define iscsi_session_rd_str_attr(field) \ static int
iscsi_session_show_str_fn(field) \ iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
static CLASS_DEVICE_ATTR(field, S_IRUGO, show_session_str_##field, NULL); {
unsigned long flags;
struct iscsi_if_conn *conn;
conn = iscsi_if_find_conn(ev->u.d_conn.conn_handle);
if (!conn)
return -EEXIST;
transport->destroy_conn(ev->u.d_conn.conn_handle);
spin_lock_irqsave(&connlock, flags);
conn->active = 0;
list_del(&conn->conn_list);
spin_unlock_irqrestore(&connlock, flags);
transport_unregister_device(&conn->dev);
device_unregister(&conn->dev);
return 0;
}
static int
iscsi_if_get_stats(struct iscsi_transport *transport, struct sk_buff *skb,
struct nlmsghdr *nlh)
{
struct iscsi_uevent *ev = NLMSG_DATA(nlh);
struct iscsi_stats *stats;
struct sk_buff *skbstat;
struct iscsi_if_conn *conn;
struct nlmsghdr *nlhstat;
struct iscsi_uevent *evstat;
int len = NLMSG_SPACE(sizeof(*ev) +
sizeof(struct iscsi_stats) +
sizeof(struct iscsi_stats_custom) *
ISCSI_STATS_CUSTOM_MAX);
int err = 0;
conn = iscsi_if_find_conn(ev->u.get_stats.conn_handle);
if (!conn)
return -EEXIST;
do {
int actual_size;
mempool_zone_complete(&conn->z_pdu);
skbstat = mempool_zone_get_skb(&conn->z_pdu);
if (!skbstat) {
printk(KERN_ERR "iscsi%d: can not deliver stats: OOM\n",
conn->host->host_no);
return -ENOMEM;
}
nlhstat = __nlmsg_put(skbstat, daemon_pid, 0, 0,
(len - sizeof(*nlhstat)), 0);
evstat = NLMSG_DATA(nlhstat);
memset(evstat, 0, sizeof(*evstat));
evstat->transport_handle = iscsi_handle(conn->transport);
evstat->type = nlh->nlmsg_type;
if (atomic_read(&conn->z_pdu.allocated) >= conn->z_pdu.hiwat)
evstat->iferror = -ENOMEM;
evstat->u.get_stats.conn_handle =
ev->u.get_stats.conn_handle;
stats = (struct iscsi_stats *)
((char*)evstat + sizeof(*evstat));
memset(stats, 0, sizeof(*stats));
transport->get_stats(ev->u.get_stats.conn_handle, stats);
actual_size = NLMSG_SPACE(sizeof(struct iscsi_uevent) +
sizeof(struct iscsi_stats) +
sizeof(struct iscsi_stats_custom) *
stats->custom_length);
actual_size -= sizeof(*nlhstat);
actual_size = NLMSG_LENGTH(actual_size);
skb_trim(skb, NLMSG_ALIGN(actual_size));
nlhstat->nlmsg_len = actual_size;
err = iscsi_unicast_skb(&conn->z_pdu, skbstat);
} while (err < 0 && err != -ECONNREFUSED);
return err;
}
static int
iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
{
int err = 0;
struct iscsi_uevent *ev = NLMSG_DATA(nlh);
struct iscsi_transport *transport = NULL;
struct iscsi_internal *priv;
if (NETLINK_CREDS(skb)->uid)
return -EPERM;
priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
if (!priv)
return -EINVAL;
transport = priv->iscsi_transport;
daemon_pid = NETLINK_CREDS(skb)->pid;
switch (nlh->nlmsg_type) {
case ISCSI_UEVENT_CREATE_SESSION:
err = iscsi_if_create_session(priv, ev);
break;
case ISCSI_UEVENT_DESTROY_SESSION:
err = iscsi_if_destroy_session(priv, ev);
break;
case ISCSI_UEVENT_CREATE_CONN:
err = iscsi_if_create_conn(transport, ev);
break;
case ISCSI_UEVENT_DESTROY_CONN:
err = iscsi_if_destroy_conn(transport, ev);
break;
case ISCSI_UEVENT_BIND_CONN:
if (!iscsi_if_find_conn(ev->u.b_conn.conn_handle))
return -EEXIST;
ev->r.retcode = transport->bind_conn(
ev->u.b_conn.session_handle,
ev->u.b_conn.conn_handle,
ev->u.b_conn.transport_fd,
ev->u.b_conn.is_leading);
break;
case ISCSI_UEVENT_SET_PARAM:
if (!iscsi_if_find_conn(ev->u.set_param.conn_handle))
return -EEXIST;
ev->r.retcode = transport->set_param(
ev->u.set_param.conn_handle,
ev->u.set_param.param, ev->u.set_param.value);
break;
case ISCSI_UEVENT_START_CONN:
if (!iscsi_if_find_conn(ev->u.start_conn.conn_handle))
return -EEXIST;
ev->r.retcode = transport->start_conn(
ev->u.start_conn.conn_handle);
break;
case ISCSI_UEVENT_STOP_CONN:
if (!iscsi_if_find_conn(ev->u.stop_conn.conn_handle))
return -EEXIST;
transport->stop_conn(ev->u.stop_conn.conn_handle,
ev->u.stop_conn.flag);
break;
case ISCSI_UEVENT_SEND_PDU:
if (!iscsi_if_find_conn(ev->u.send_pdu.conn_handle))
return -EEXIST;
ev->r.retcode = transport->send_pdu(
ev->u.send_pdu.conn_handle,
(struct iscsi_hdr*)((char*)ev + sizeof(*ev)),
(char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
ev->u.send_pdu.data_size);
break;
case ISCSI_UEVENT_GET_STATS:
err = iscsi_if_get_stats(transport, skb, nlh);
break;
default:
err = -EINVAL;
break;
}
return err;
}
/* Get message from skb (based on rtnetlink_rcv_skb). Each message is
* processed by iscsi_if_recv_msg. Malformed skbs with wrong length are
* discarded silently. */
static void
iscsi_if_rx(struct sock *sk, int len)
{
struct sk_buff *skb;
iscsi_session_rd_str_attr(target_name); down(&rx_queue_sema);
iscsi_session_rd_str_attr(target_alias); while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
while (skb->len >= NLMSG_SPACE(0)) {
int err;
uint32_t rlen;
struct nlmsghdr *nlh;
struct iscsi_uevent *ev;
nlh = (struct nlmsghdr *)skb->data;
if (nlh->nlmsg_len < sizeof(*nlh) ||
skb->len < nlh->nlmsg_len) {
break;
}
ev = NLMSG_DATA(nlh);
rlen = NLMSG_ALIGN(nlh->nlmsg_len);
if (rlen > skb->len)
rlen = skb->len;
err = iscsi_if_recv_msg(skb, nlh);
if (err) {
ev->type = ISCSI_KEVENT_IF_ERROR;
ev->iferror = err;
}
do {
/*
* special case for GET_STATS:
* on success - sending reply and stats from
* inside of if_recv_msg(),
* on error - fall through.
*/
if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
break;
err = iscsi_if_send_reply(
NETLINK_CREDS(skb)->pid, nlh->nlmsg_seq,
nlh->nlmsg_type, 0, 0, ev, sizeof(*ev));
if (atomic_read(&z_reply.allocated) >=
z_reply.hiwat)
ev->iferror = -ENOMEM;
} while (err < 0 && err != -ECONNREFUSED);
skb_pull(skb, rlen);
}
kfree_skb(skb);
}
up(&rx_queue_sema);
}
/* /*
* iSCSI host attrs * iSCSI connection attrs
*/ */
#define iscsi_conn_int_attr_show(param, format) \
static ssize_t \
show_conn_int_param_##param(struct class_device *cdev, char *buf) \
{ \
uint32_t value = 0; \
struct iscsi_if_conn *conn = iscsi_cdev_to_if_conn(cdev); \
struct iscsi_internal *priv; \
\
priv = to_iscsi_internal(conn->host->transportt); \
if (priv->param_mask & (1 << param)) \
priv->iscsi_transport->get_param(conn->connh, param, &value); \
return snprintf(buf, 20, format"\n", value); \
}
#define iscsi_conn_int_attr(field, param, format) \
iscsi_conn_int_attr_show(param, format) \
static CLASS_DEVICE_ATTR(field, S_IRUGO, show_conn_int_param_##param, NULL);
iscsi_conn_int_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH, "%u");
iscsi_conn_int_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH, "%u");
iscsi_conn_int_attr(header_digest, ISCSI_PARAM_HDRDGST_EN, "%d");
iscsi_conn_int_attr(data_digest, ISCSI_PARAM_DATADGST_EN, "%d");
iscsi_conn_int_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN, "%d");
iscsi_conn_int_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN, "%d");
/* /*
* Again, this is used for iSCSI names. Normally, we follow * iSCSI session attrs
* the transport class convention of having the lld set
* the field, but in these cases the value is too large.
*/ */
#define iscsi_host_show_str_fn(field) \ #define iscsi_session_int_attr_show(param, format) \
\
static ssize_t \ static ssize_t \
show_host_str_##field(struct class_device *cdev, char *buf) \ show_session_int_param_##param(struct class_device *cdev, char *buf) \
{ \ { \
int ret = 0; \ uint32_t value = 0; \
struct Scsi_Host *shost = transport_class_to_shost(cdev); \ struct iscsi_if_session *session = iscsi_cdev_to_if_session(cdev); \
struct iscsi_internal *i = to_iscsi_internal(shost->transportt); \ struct Scsi_Host *shost = iscsi_if_session_to_shost(session); \
struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
struct iscsi_if_conn *conn = NULL; \
unsigned long flags; \
\
spin_lock_irqsave(&connlock, flags); \
if (!list_empty(&session->connections)) \
conn = list_entry(session->connections.next, \
struct iscsi_if_conn, session_list); \
spin_unlock_irqrestore(&connlock, flags); \
\ \
if (i->fnt->get_##field) \ if (conn && (priv->param_mask & (1 << param))) \
ret = i->fnt->get_##field(shost, buf, PAGE_SIZE); \ priv->iscsi_transport->get_param(conn->connh, param, &value);\
return ret; \ return snprintf(buf, 20, format"\n", value); \
} }
#define iscsi_host_rd_str_attr(field) \ #define iscsi_session_int_attr(field, param, format) \
iscsi_host_show_str_fn(field) \ iscsi_session_int_attr_show(param, format) \
static CLASS_DEVICE_ATTR(field, S_IRUGO, show_host_str_##field, NULL); static CLASS_DEVICE_ATTR(field, S_IRUGO, show_session_int_param_##param, NULL);
iscsi_host_rd_str_attr(initiator_name); iscsi_session_int_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, "%d");
iscsi_host_rd_str_attr(initiator_alias); iscsi_session_int_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, "%hu");
iscsi_session_int_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, "%d");
iscsi_session_int_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, "%u");
iscsi_session_int_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, "%u");
iscsi_session_int_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, "%d");
iscsi_session_int_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, "%d");
iscsi_session_int_attr(erl, ISCSI_PARAM_ERL, "%d");
#define SETUP_SESSION_RD_ATTR(field) \ #define SETUP_SESSION_RD_ATTR(field, param) \
if (i->fnt->show_##field) { \ if (priv->param_mask & (1 << param)) { \
i->session_attrs[count] = &class_device_attr_##field; \ priv->session_attrs[count] = &class_device_attr_##field;\
count++; \ count++; \
} }
#define SETUP_HOST_RD_ATTR(field) \ #define SETUP_CONN_RD_ATTR(field, param) \
if (i->fnt->show_##field) { \ if (priv->param_mask & (1 << param)) { \
i->host_attrs[count] = &class_device_attr_##field; \ priv->conn_attrs[count] = &class_device_attr_##field; \
count++; \ count++; \
} }
static int iscsi_host_match(struct attribute_container *cont, static int iscsi_is_session_dev(const struct device *dev)
struct device *dev) {
return dev->release == iscsi_if_session_dev_release;
}
static int iscsi_session_match(struct attribute_container *cont,
struct device *dev)
{ {
struct iscsi_if_session *session;
struct Scsi_Host *shost; struct Scsi_Host *shost;
struct iscsi_internal *i; struct iscsi_internal *priv;
if (!iscsi_is_session_dev(dev))
return 0;
if (!scsi_is_host_device(dev)) session = iscsi_dev_to_if_session(dev);
shost = iscsi_if_session_to_shost(session);
if (!shost->transportt)
return 0; return 0;
shost = dev_to_shost(dev); priv = to_iscsi_internal(shost->transportt);
if (!shost->transportt || shost->transportt->host_attrs.ac.class if (priv->session_cont.ac.class != &iscsi_session_class.class)
!= &iscsi_host_class.class)
return 0; return 0;
i = to_iscsi_internal(shost->transportt); return &priv->session_cont.ac == cont;
return &i->t.host_attrs.ac == cont;
} }
static int iscsi_target_match(struct attribute_container *cont, static int iscsi_is_conn_dev(const struct device *dev)
struct device *dev)
{ {
return dev->release == iscsi_if_conn_dev_release;
}
static int iscsi_conn_match(struct attribute_container *cont,
struct device *dev)
{
struct iscsi_if_conn *conn;
struct Scsi_Host *shost; struct Scsi_Host *shost;
struct iscsi_internal *i; struct iscsi_internal *priv;
if (!scsi_is_target_device(dev)) if (!iscsi_is_conn_dev(dev))
return 0; return 0;
shost = dev_to_shost(dev->parent); conn = iscsi_dev_to_if_conn(dev);
if (!shost->transportt || shost->transportt->host_attrs.ac.class shost = conn->host;
!= &iscsi_host_class.class) if (!shost->transportt)
return 0; return 0;
i = to_iscsi_internal(shost->transportt); priv = to_iscsi_internal(shost->transportt);
if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
return &i->t.target_attrs.ac == cont; return 0;
}
struct scsi_transport_template *
iscsi_attach_transport(struct iscsi_function_template *fnt)
{
struct iscsi_internal *i = kmalloc(sizeof(struct iscsi_internal),
GFP_KERNEL);
int count = 0;
if (unlikely(!i))
return NULL;
memset(i, 0, sizeof(struct iscsi_internal));
i->fnt = fnt;
i->t.target_attrs.ac.attrs = &i->session_attrs[0];
i->t.target_attrs.ac.class = &iscsi_transport_class.class;
i->t.target_attrs.ac.match = iscsi_target_match;
transport_container_register(&i->t.target_attrs);
i->t.target_size = sizeof(struct iscsi_class_session);
SETUP_SESSION_RD_ATTR(tsih);
SETUP_SESSION_RD_ATTR(isid);
SETUP_SESSION_RD_ATTR(header_digest);
SETUP_SESSION_RD_ATTR(data_digest);
SETUP_SESSION_RD_ATTR(target_name);
SETUP_SESSION_RD_ATTR(target_alias);
SETUP_SESSION_RD_ATTR(port);
SETUP_SESSION_RD_ATTR(tpgt);
SETUP_SESSION_RD_ATTR(ip_address);
SETUP_SESSION_RD_ATTR(initial_r2t);
SETUP_SESSION_RD_ATTR(immediate_data);
SETUP_SESSION_RD_ATTR(max_recv_data_segment_len);
SETUP_SESSION_RD_ATTR(max_burst_len);
SETUP_SESSION_RD_ATTR(first_burst_len);
SETUP_SESSION_RD_ATTR(def_time2wait);
SETUP_SESSION_RD_ATTR(def_time2retain);
SETUP_SESSION_RD_ATTR(max_outstanding_r2t);
SETUP_SESSION_RD_ATTR(data_pdu_in_order);
SETUP_SESSION_RD_ATTR(data_sequence_in_order);
SETUP_SESSION_RD_ATTR(erl);
BUG_ON(count > ISCSI_SESSION_ATTRS); return &priv->conn_cont.ac == cont;
i->session_attrs[count] = NULL; }
int iscsi_register_transport(struct iscsi_transport *tt)
{
struct iscsi_internal *priv;
unsigned long flags;
int count = 0, err;
BUG_ON(!tt);
priv = iscsi_if_transport_lookup(tt);
if (priv)
return -EEXIST;
priv = kmalloc(sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
memset(priv, 0, sizeof(*priv));
INIT_LIST_HEAD(&priv->list);
INIT_LIST_HEAD(&priv->sessions);
spin_lock_init(&priv->session_lock);
priv->iscsi_transport = tt;
priv->cdev.class = &iscsi_transport_class;
snprintf(priv->cdev.class_id, BUS_ID_SIZE, "%s", tt->name);
err = class_device_register(&priv->cdev);
if (err)
goto free_priv;
err = sysfs_create_group(&priv->cdev.kobj, &iscsi_transport_group);
if (err)
goto unregister_cdev;
/* setup parameters mask */
priv->param_mask = 0xFFFFFFFF;
if (!(tt->caps & CAP_MULTI_R2T))
priv->param_mask &= ~(1 << ISCSI_PARAM_MAX_R2T);
if (!(tt->caps & CAP_HDRDGST))
priv->param_mask &= ~(1 << ISCSI_PARAM_HDRDGST_EN);
if (!(tt->caps & CAP_DATADGST))
priv->param_mask &= ~(1 << ISCSI_PARAM_DATADGST_EN);
if (!(tt->caps & CAP_MARKERS)) {
priv->param_mask &= ~(1 << ISCSI_PARAM_IFMARKER_EN);
priv->param_mask &= ~(1 << ISCSI_PARAM_OFMARKER_EN);
}
i->t.host_attrs.ac.attrs = &i->host_attrs[0]; /* connection parameters */
i->t.host_attrs.ac.class = &iscsi_host_class.class; priv->conn_cont.ac.attrs = &priv->conn_attrs[0];
i->t.host_attrs.ac.match = iscsi_host_match; priv->conn_cont.ac.class = &iscsi_connection_class.class;
transport_container_register(&i->t.host_attrs); priv->conn_cont.ac.match = iscsi_conn_match;
i->t.host_size = 0; transport_container_register(&priv->conn_cont);
SETUP_CONN_RD_ATTR(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
SETUP_CONN_RD_ATTR(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
SETUP_CONN_RD_ATTR(header_digest, ISCSI_PARAM_HDRDGST_EN);
SETUP_CONN_RD_ATTR(data_digest, ISCSI_PARAM_DATADGST_EN);
SETUP_CONN_RD_ATTR(ifmarker, ISCSI_PARAM_IFMARKER_EN);
SETUP_CONN_RD_ATTR(ofmarker, ISCSI_PARAM_OFMARKER_EN);
BUG_ON(count > ISCSI_CONN_ATTRS);
priv->conn_attrs[count] = NULL;
count = 0; count = 0;
SETUP_HOST_RD_ATTR(initiator_name);
SETUP_HOST_RD_ATTR(initiator_alias);
BUG_ON(count > ISCSI_HOST_ATTRS); /* session parameters */
i->host_attrs[count] = NULL; priv->session_cont.ac.attrs = &priv->session_attrs[0];
priv->session_cont.ac.class = &iscsi_session_class.class;
priv->session_cont.ac.match = iscsi_session_match;
transport_container_register(&priv->session_cont);
SETUP_SESSION_RD_ATTR(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN);
SETUP_SESSION_RD_ATTR(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T);
SETUP_SESSION_RD_ATTR(immediate_data, ISCSI_PARAM_IMM_DATA_EN);
SETUP_SESSION_RD_ATTR(first_burst_len, ISCSI_PARAM_FIRST_BURST);
SETUP_SESSION_RD_ATTR(max_burst_len, ISCSI_PARAM_MAX_BURST);
SETUP_SESSION_RD_ATTR(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN);
SETUP_SESSION_RD_ATTR(data_seq_in_order,ISCSI_PARAM_DATASEQ_INORDER_EN)
SETUP_SESSION_RD_ATTR(erl, ISCSI_PARAM_ERL);
BUG_ON(count > ISCSI_SESSION_ATTRS);
priv->session_attrs[count] = NULL;
spin_lock_irqsave(&iscsi_transport_lock, flags);
list_add(&priv->list, &iscsi_transports);
spin_unlock_irqrestore(&iscsi_transport_lock, flags);
printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
return 0;
return &i->t; unregister_cdev:
class_device_unregister(&priv->cdev);
free_priv:
kfree(priv);
return err;
} }
EXPORT_SYMBOL_GPL(iscsi_register_transport);
int iscsi_unregister_transport(struct iscsi_transport *tt)
{
struct iscsi_internal *priv;
unsigned long flags;
BUG_ON(!tt);
down(&rx_queue_sema);
priv = iscsi_if_transport_lookup(tt);
BUG_ON (!priv);
spin_lock_irqsave(&priv->session_lock, flags);
if (!list_empty(&priv->sessions)) {
spin_unlock_irqrestore(&priv->session_lock, flags);
up(&rx_queue_sema);
return -EPERM;
}
spin_unlock_irqrestore(&priv->session_lock, flags);
spin_lock_irqsave(&iscsi_transport_lock, flags);
list_del(&priv->list);
spin_unlock_irqrestore(&iscsi_transport_lock, flags);
transport_container_unregister(&priv->conn_cont);
transport_container_unregister(&priv->session_cont);
sysfs_remove_group(&priv->cdev.kobj, &iscsi_transport_group);
class_device_unregister(&priv->cdev);
up(&rx_queue_sema);
EXPORT_SYMBOL(iscsi_attach_transport); return 0;
}
EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
void iscsi_release_transport(struct scsi_transport_template *t) static int
iscsi_rcv_nl_event(struct notifier_block *this, unsigned long event, void *ptr)
{ {
struct iscsi_internal *i = to_iscsi_internal(t); struct netlink_notify *n = ptr;
if (event == NETLINK_URELEASE &&
n->protocol == NETLINK_ISCSI && n->pid) {
struct iscsi_if_conn *conn;
unsigned long flags;
mempool_zone_complete(&z_reply);
spin_lock_irqsave(&connlock, flags);
list_for_each_entry(conn, &connlist, conn_list) {
mempool_zone_complete(&conn->z_error);
mempool_zone_complete(&conn->z_pdu);
}
spin_unlock_irqrestore(&connlock, flags);
}
transport_container_unregister(&i->t.target_attrs); return NOTIFY_DONE;
transport_container_unregister(&i->t.host_attrs);
kfree(i);
} }
EXPORT_SYMBOL(iscsi_release_transport); static struct notifier_block iscsi_nl_notifier = {
.notifier_call = iscsi_rcv_nl_event,
};
static __init int iscsi_transport_init(void) static __init int iscsi_transport_init(void)
{ {
int err = transport_class_register(&iscsi_transport_class); int err;
err = class_register(&iscsi_transport_class);
if (err) if (err)
return err; return err;
return transport_class_register(&iscsi_host_class);
err = transport_class_register(&iscsi_connection_class);
if (err)
goto unregister_transport_class;
err = transport_class_register(&iscsi_session_class);
if (err)
goto unregister_conn_class;
err = netlink_register_notifier(&iscsi_nl_notifier);
if (err)
goto unregister_session_class;
nls = netlink_kernel_create(NETLINK_ISCSI, 1, iscsi_if_rx,
THIS_MODULE);
if (!nls) {
err = -ENOBUFS;
goto unregister_notifier;
}
err = mempool_zone_init(&z_reply, Z_MAX_REPLY,
NLMSG_SPACE(sizeof(struct iscsi_uevent)), Z_HIWAT_REPLY);
if (!err)
return 0;
sock_release(nls->sk_socket);
unregister_notifier:
netlink_unregister_notifier(&iscsi_nl_notifier);
unregister_session_class:
transport_class_unregister(&iscsi_session_class);
unregister_conn_class:
transport_class_unregister(&iscsi_connection_class);
unregister_transport_class:
class_unregister(&iscsi_transport_class);
return err;
} }
static void __exit iscsi_transport_exit(void) static void __exit iscsi_transport_exit(void)
{ {
transport_class_unregister(&iscsi_host_class); mempool_destroy(z_reply.pool);
transport_class_unregister(&iscsi_transport_class); sock_release(nls->sk_socket);
netlink_unregister_notifier(&iscsi_nl_notifier);
transport_class_unregister(&iscsi_connection_class);
transport_class_unregister(&iscsi_session_class);
class_unregister(&iscsi_transport_class);
} }
module_init(iscsi_transport_init); module_init(iscsi_transport_init);
module_exit(iscsi_transport_exit); module_exit(iscsi_transport_exit);
MODULE_AUTHOR("Mike Christie"); MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
MODULE_DESCRIPTION("iSCSI Transport Attributes"); "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
"Alex Aizman <itn780@yahoo.com>");
MODULE_DESCRIPTION("iSCSI Transport Interface");
MODULE_LICENSE("GPL"); MODULE_LICENSE("GPL");
...@@ -280,19 +280,6 @@ ...@@ -280,19 +280,6 @@
#define SCSI_NCR_MAX_LUN (1) #define SCSI_NCR_MAX_LUN (1)
#endif #endif
/*
** These simple macros limit expression involving
** kernel time values (jiffies) to some that have
** chance not to be too much incorrect. :-)
*/
#define ktime_get(o) (jiffies + (u_long) o)
#define ktime_exp(b) ((long)(jiffies) - (long)(b) >= 0)
#define ktime_dif(a, b) ((long)(a) - (long)(b))
/* These ones are not used in this driver */
#define ktime_add(a, o) ((a) + (u_long)(o))
#define ktime_sub(a, o) ((a) - (u_long)(o))
/* /*
* IO functions definition for big/little endian CPU support. * IO functions definition for big/little endian CPU support.
* For now, the NCR is only supported in little endian addressing mode, * For now, the NCR is only supported in little endian addressing mode,
......
...@@ -988,7 +988,15 @@ dc390_DataIn_0( struct dc390_acb* pACB, struct dc390_srb* pSRB, u8 *psstatus) ...@@ -988,7 +988,15 @@ dc390_DataIn_0( struct dc390_acb* pACB, struct dc390_srb* pSRB, u8 *psstatus)
if( residual ) if( residual )
{ {
static int feedback_requested;
bval = DC390_read8 (ScsiFifo); /* get one residual byte */ bval = DC390_read8 (ScsiFifo); /* get one residual byte */
if (!feedback_requested) {
feedback_requested = 1;
printk(KERN_WARNING "%s: Please, contact <linux-scsi@vger.kernel.org> "
"to help improve support for your system.\n", __FILE__);
}
ptr = (u8 *) bus_to_virt( pSRB->SGBusAddr ); ptr = (u8 *) bus_to_virt( pSRB->SGBusAddr );
*ptr = bval; *ptr = bval;
pSRB->SGBusAddr++; xferCnt++; pSRB->SGBusAddr++; xferCnt++;
......
/*
* iSCSI User/Kernel Shares (Defines, Constants, Protocol definitions, etc)
*
* Copyright (C) 2005 Dmitry Yusupov
* Copyright (C) 2005 Alex Aizman
* maintained by open-iscsi@googlegroups.com
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published
* by the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* See the file COPYING included with this distribution for more details.
*/
#ifndef ISCSI_IF_H
#define ISCSI_IF_H
#include <scsi/iscsi_proto.h>
#define UEVENT_BASE 10
#define KEVENT_BASE 100
#define ISCSI_ERR_BASE 1000
enum iscsi_uevent_e {
ISCSI_UEVENT_UNKNOWN = 0,
/* down events */
ISCSI_UEVENT_CREATE_SESSION = UEVENT_BASE + 1,
ISCSI_UEVENT_DESTROY_SESSION = UEVENT_BASE + 2,
ISCSI_UEVENT_CREATE_CONN = UEVENT_BASE + 3,
ISCSI_UEVENT_DESTROY_CONN = UEVENT_BASE + 4,
ISCSI_UEVENT_BIND_CONN = UEVENT_BASE + 5,
ISCSI_UEVENT_SET_PARAM = UEVENT_BASE + 6,
ISCSI_UEVENT_START_CONN = UEVENT_BASE + 7,
ISCSI_UEVENT_STOP_CONN = UEVENT_BASE + 8,
ISCSI_UEVENT_SEND_PDU = UEVENT_BASE + 9,
ISCSI_UEVENT_GET_STATS = UEVENT_BASE + 10,
ISCSI_UEVENT_GET_PARAM = UEVENT_BASE + 11,
/* up events */
ISCSI_KEVENT_RECV_PDU = KEVENT_BASE + 1,
ISCSI_KEVENT_CONN_ERROR = KEVENT_BASE + 2,
ISCSI_KEVENT_IF_ERROR = KEVENT_BASE + 3,
};
struct iscsi_uevent {
uint32_t type; /* k/u events type */
uint32_t iferror; /* carries interface or resource errors */
uint64_t transport_handle;
union {
/* messages u -> k */
struct msg_create_session {
uint32_t initial_cmdsn;
} c_session;
struct msg_destroy_session {
uint64_t session_handle;
uint32_t sid;
} d_session;
struct msg_create_conn {
uint64_t session_handle;
uint32_t cid;
uint32_t sid;
} c_conn;
struct msg_bind_conn {
uint64_t session_handle;
uint64_t conn_handle;
uint32_t transport_fd;
uint32_t is_leading;
} b_conn;
struct msg_destroy_conn {
uint64_t conn_handle;
uint32_t cid;
} d_conn;
struct msg_send_pdu {
uint32_t hdr_size;
uint32_t data_size;
uint64_t conn_handle;
} send_pdu;
struct msg_set_param {
uint64_t conn_handle;
uint32_t param; /* enum iscsi_param */
uint32_t value;
} set_param;
struct msg_start_conn {
uint64_t conn_handle;
} start_conn;
struct msg_stop_conn {
uint64_t conn_handle;
uint32_t flag;
} stop_conn;
struct msg_get_stats {
uint64_t conn_handle;
} get_stats;
} u;
union {
/* messages k -> u */
uint64_t handle;
int retcode;
struct msg_create_session_ret {
uint64_t session_handle;
uint32_t sid;
} c_session_ret;
struct msg_recv_req {
uint64_t recv_handle;
uint64_t conn_handle;
} recv_req;
struct msg_conn_error {
uint64_t conn_handle;
uint32_t error; /* enum iscsi_err */
} connerror;
} r;
} __attribute__ ((aligned (sizeof(uint64_t))));
/*
* Common error codes
*/
enum iscsi_err {
ISCSI_OK = 0,
ISCSI_ERR_DATASN = ISCSI_ERR_BASE + 1,
ISCSI_ERR_DATA_OFFSET = ISCSI_ERR_BASE + 2,
ISCSI_ERR_MAX_CMDSN = ISCSI_ERR_BASE + 3,
ISCSI_ERR_EXP_CMDSN = ISCSI_ERR_BASE + 4,
ISCSI_ERR_BAD_OPCODE = ISCSI_ERR_BASE + 5,
ISCSI_ERR_DATALEN = ISCSI_ERR_BASE + 6,
ISCSI_ERR_AHSLEN = ISCSI_ERR_BASE + 7,
ISCSI_ERR_PROTO = ISCSI_ERR_BASE + 8,
ISCSI_ERR_LUN = ISCSI_ERR_BASE + 9,
ISCSI_ERR_BAD_ITT = ISCSI_ERR_BASE + 10,
ISCSI_ERR_CONN_FAILED = ISCSI_ERR_BASE + 11,
ISCSI_ERR_R2TSN = ISCSI_ERR_BASE + 12,
ISCSI_ERR_SESSION_FAILED = ISCSI_ERR_BASE + 13,
ISCSI_ERR_HDR_DGST = ISCSI_ERR_BASE + 14,
ISCSI_ERR_DATA_DGST = ISCSI_ERR_BASE + 15,
ISCSI_ERR_PARAM_NOT_FOUND = ISCSI_ERR_BASE + 16
};
/*
* iSCSI Parameters (RFC3720)
*/
enum iscsi_param {
ISCSI_PARAM_MAX_RECV_DLENGTH = 0,
ISCSI_PARAM_MAX_XMIT_DLENGTH = 1,
ISCSI_PARAM_HDRDGST_EN = 2,
ISCSI_PARAM_DATADGST_EN = 3,
ISCSI_PARAM_INITIAL_R2T_EN = 4,
ISCSI_PARAM_MAX_R2T = 5,
ISCSI_PARAM_IMM_DATA_EN = 6,
ISCSI_PARAM_FIRST_BURST = 7,
ISCSI_PARAM_MAX_BURST = 8,
ISCSI_PARAM_PDU_INORDER_EN = 9,
ISCSI_PARAM_DATASEQ_INORDER_EN = 10,
ISCSI_PARAM_ERL = 11,
ISCSI_PARAM_IFMARKER_EN = 12,
ISCSI_PARAM_OFMARKER_EN = 13,
};
#define ISCSI_PARAM_MAX 14
typedef uint64_t iscsi_sessionh_t; /* iSCSI Data-Path session handle */
typedef uint64_t iscsi_connh_t; /* iSCSI Data-Path connection handle */
#define iscsi_ptr(_handle) ((void*)(unsigned long)_handle)
#define iscsi_handle(_ptr) ((uint64_t)(unsigned long)_ptr)
#define iscsi_hostdata(_hostdata) ((void*)_hostdata + sizeof(unsigned long))
/*
* These flags presents iSCSI Data-Path capabilities.
*/
#define CAP_RECOVERY_L0 0x1
#define CAP_RECOVERY_L1 0x2
#define CAP_RECOVERY_L2 0x4
#define CAP_MULTI_R2T 0x8
#define CAP_HDRDGST 0x10
#define CAP_DATADGST 0x20
#define CAP_MULTI_CONN 0x40
#define CAP_TEXT_NEGO 0x80
#define CAP_MARKERS 0x100
/*
* These flags describes reason of stop_conn() call
*/
#define STOP_CONN_TERM 0x1
#define STOP_CONN_SUSPEND 0x2
#define STOP_CONN_RECOVER 0x3
#define ISCSI_STATS_CUSTOM_MAX 32
#define ISCSI_STATS_CUSTOM_DESC_MAX 64
struct iscsi_stats_custom {
char desc[ISCSI_STATS_CUSTOM_DESC_MAX];
uint64_t value;
};
/*
* struct iscsi_stats - iSCSI Statistics (iSCSI MIB)
*
* Note: this structure contains counters collected on per-connection basis.
*/
struct iscsi_stats {
/* octets */
uint64_t txdata_octets;
uint64_t rxdata_octets;
/* xmit pdus */
uint32_t noptx_pdus;
uint32_t scsicmd_pdus;
uint32_t tmfcmd_pdus;
uint32_t login_pdus;
uint32_t text_pdus;
uint32_t dataout_pdus;
uint32_t logout_pdus;
uint32_t snack_pdus;
/* recv pdus */
uint32_t noprx_pdus;
uint32_t scsirsp_pdus;
uint32_t tmfrsp_pdus;
uint32_t textrsp_pdus;
uint32_t datain_pdus;
uint32_t logoutrsp_pdus;
uint32_t r2t_pdus;
uint32_t async_pdus;
uint32_t rjt_pdus;
/* errors */
uint32_t digest_err;
uint32_t timeout_err;
/*
* iSCSI Custom Statistics support, i.e. Transport could
* extend existing MIB statistics with its own specific statistics
* up to ISCSI_STATS_CUSTOM_MAX
*/
uint32_t custom_length;
struct iscsi_stats_custom custom[0]
__attribute__ ((aligned (sizeof(uint64_t))));
};
#endif
/*
* RFC 3720 (iSCSI) protocol data types
*
* Copyright (C) 2005 Dmitry Yusupov
* Copyright (C) 2005 Alex Aizman
* maintained by open-iscsi@googlegroups.com
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published
* by the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* See the file COPYING included with this distribution for more details.
*/
#ifndef ISCSI_PROTO_H
#define ISCSI_PROTO_H
#define ISCSI_VERSION_STR "0.3"
#define ISCSI_DATE_STR "22-Apr-2005"
#define ISCSI_DRAFT20_VERSION 0x00
/* default iSCSI listen port for incoming connections */
#define ISCSI_LISTEN_PORT 3260
/* Padding word length */
#define PAD_WORD_LEN 4
/*
* useful common(control and data pathes) macro
*/
#define ntoh24(p) (((p)[0] << 16) | ((p)[1] << 8) | ((p)[2]))
#define hton24(p, v) { \
p[0] = (((v) >> 16) & 0xFF); \
p[1] = (((v) >> 8) & 0xFF); \
p[2] = ((v) & 0xFF); \
}
#define zero_data(p) {p[0]=0;p[1]=0;p[2]=0;}
/*
* iSCSI Template Message Header
*/
struct iscsi_hdr {
uint8_t opcode;
uint8_t flags; /* Final bit */
uint8_t rsvd2[2];
uint8_t hlength; /* AHSs total length */
uint8_t dlength[3]; /* Data length */
uint8_t lun[8];
__be32 itt; /* Initiator Task Tag */
__be32 ttt; /* Target Task Tag */
__be32 statsn;
__be32 exp_statsn;
__be32 max_statsn;
uint8_t other[12];
};
/************************* RFC 3720 Begin *****************************/
#define ISCSI_RESERVED_TAG 0xffffffff
/* Opcode encoding bits */
#define ISCSI_OP_RETRY 0x80
#define ISCSI_OP_IMMEDIATE 0x40
#define ISCSI_OPCODE_MASK 0x3F
/* Initiator Opcode values */
#define ISCSI_OP_NOOP_OUT 0x00
#define ISCSI_OP_SCSI_CMD 0x01
#define ISCSI_OP_SCSI_TMFUNC 0x02
#define ISCSI_OP_LOGIN 0x03
#define ISCSI_OP_TEXT 0x04
#define ISCSI_OP_SCSI_DATA_OUT 0x05
#define ISCSI_OP_LOGOUT 0x06
#define ISCSI_OP_SNACK 0x10
#define ISCSI_OP_VENDOR1_CMD 0x1c
#define ISCSI_OP_VENDOR2_CMD 0x1d
#define ISCSI_OP_VENDOR3_CMD 0x1e
#define ISCSI_OP_VENDOR4_CMD 0x1f
/* Target Opcode values */
#define ISCSI_OP_NOOP_IN 0x20
#define ISCSI_OP_SCSI_CMD_RSP 0x21
#define ISCSI_OP_SCSI_TMFUNC_RSP 0x22
#define ISCSI_OP_LOGIN_RSP 0x23
#define ISCSI_OP_TEXT_RSP 0x24
#define ISCSI_OP_SCSI_DATA_IN 0x25
#define ISCSI_OP_LOGOUT_RSP 0x26
#define ISCSI_OP_R2T 0x31
#define ISCSI_OP_ASYNC_EVENT 0x32
#define ISCSI_OP_REJECT 0x3f
struct iscsi_ahs_hdr {
__be16 ahslength;
uint8_t ahstype;
uint8_t ahspec[5];
};
#define ISCSI_AHSTYPE_CDB 1
#define ISCSI_AHSTYPE_RLENGTH 2
/* iSCSI PDU Header */
struct iscsi_cmd {
uint8_t opcode;
uint8_t flags;
__be16 rsvd2;
uint8_t hlength;
uint8_t dlength[3];
uint8_t lun[8];
__be32 itt; /* Initiator Task Tag */
__be32 data_length;
__be32 cmdsn;
__be32 exp_statsn;
uint8_t cdb[16]; /* SCSI Command Block */
/* Additional Data (Command Dependent) */
};
/* Command PDU flags */
#define ISCSI_FLAG_CMD_FINAL 0x80
#define ISCSI_FLAG_CMD_READ 0x40
#define ISCSI_FLAG_CMD_WRITE 0x20
#define ISCSI_FLAG_CMD_ATTR_MASK 0x07 /* 3 bits */
/* SCSI Command Attribute values */
#define ISCSI_ATTR_UNTAGGED 0
#define ISCSI_ATTR_SIMPLE 1
#define ISCSI_ATTR_ORDERED 2
#define ISCSI_ATTR_HEAD_OF_QUEUE 3
#define ISCSI_ATTR_ACA 4
struct iscsi_rlength_ahdr {
__be16 ahslength;
uint8_t ahstype;
uint8_t reserved;
__be32 read_length;
};
/* SCSI Response Header */
struct iscsi_cmd_rsp {
uint8_t opcode;
uint8_t flags;
uint8_t response;
uint8_t cmd_status;
uint8_t hlength;
uint8_t dlength[3];
uint8_t rsvd[8];
__be32 itt; /* Initiator Task Tag */
__be32 rsvd1;
__be32 statsn;
__be32 exp_cmdsn;
__be32 max_cmdsn;
__be32 exp_datasn;
__be32 bi_residual_count;
__be32 residual_count;
/* Response or Sense Data (optional) */
};
/* Command Response PDU flags */
#define ISCSI_FLAG_CMD_BIDI_OVERFLOW 0x10
#define ISCSI_FLAG_CMD_BIDI_UNDERFLOW 0x08
#define ISCSI_FLAG_CMD_OVERFLOW 0x04
#define ISCSI_FLAG_CMD_UNDERFLOW 0x02
/* iSCSI Status values. Valid if Rsp Selector bit is not set */
#define ISCSI_STATUS_CMD_COMPLETED 0
#define ISCSI_STATUS_TARGET_FAILURE 1
#define ISCSI_STATUS_SUBSYS_FAILURE 2
/* Asynchronous Event Header */
struct iscsi_async {
uint8_t opcode;
uint8_t flags;
uint8_t rsvd2[2];
uint8_t rsvd3;
uint8_t dlength[3];
uint8_t lun[8];
uint8_t rsvd4[8];
__be32 statsn;
__be32 exp_cmdsn;
__be32 max_cmdsn;
uint8_t async_event;
uint8_t async_vcode;
__be16 param1;
__be16 param2;
__be16 param3;
uint8_t rsvd5[4];
};
/* iSCSI Event Codes */
#define ISCSI_ASYNC_MSG_SCSI_EVENT 0
#define ISCSI_ASYNC_MSG_REQUEST_LOGOUT 1
#define ISCSI_ASYNC_MSG_DROPPING_CONNECTION 2
#define ISCSI_ASYNC_MSG_DROPPING_ALL_CONNECTIONS 3
#define ISCSI_ASYNC_MSG_PARAM_NEGOTIATION 4
#define ISCSI_ASYNC_MSG_VENDOR_SPECIFIC 255
/* NOP-Out Message */
struct iscsi_nopout {
uint8_t opcode;
uint8_t flags;
__be16 rsvd2;
uint8_t rsvd3;
uint8_t dlength[3];
uint8_t lun[8];
__be32 itt; /* Initiator Task Tag */
__be32 ttt; /* Target Transfer Tag */
__be32 cmdsn;
__be32 exp_statsn;
uint8_t rsvd4[16];
};
/* NOP-In Message */
struct iscsi_nopin {
uint8_t opcode;
uint8_t flags;
__be16 rsvd2;
uint8_t rsvd3;
uint8_t dlength[3];
uint8_t lun[8];
__be32 itt; /* Initiator Task Tag */
__be32 ttt; /* Target Transfer Tag */
__be32 statsn;
__be32 exp_cmdsn;
__be32 max_cmdsn;
uint8_t rsvd4[12];
};
/* SCSI Task Management Message Header */
struct iscsi_tm {
uint8_t opcode;
uint8_t flags;
uint8_t rsvd1[2];
uint8_t hlength;
uint8_t dlength[3];
uint8_t lun[8];
__be32 itt; /* Initiator Task Tag */
__be32 rtt; /* Reference Task Tag */
__be32 cmdsn;
__be32 exp_statsn;
__be32 refcmdsn;
__be32 exp_datasn;
uint8_t rsvd2[8];
};
#define ISCSI_FLAG_TM_FUNC_MASK 0x7F
/* Function values */
#define ISCSI_TM_FUNC_ABORT_TASK 1
#define ISCSI_TM_FUNC_ABORT_TASK_SET 2
#define ISCSI_TM_FUNC_CLEAR_ACA 3
#define ISCSI_TM_FUNC_CLEAR_TASK_SET 4
#define ISCSI_TM_FUNC_LOGICAL_UNIT_RESET 5
#define ISCSI_TM_FUNC_TARGET_WARM_RESET 6
#define ISCSI_TM_FUNC_TARGET_COLD_RESET 7
#define ISCSI_TM_FUNC_TASK_REASSIGN 8
/* SCSI Task Management Response Header */
struct iscsi_tm_rsp {
uint8_t opcode;
uint8_t flags;
uint8_t response; /* see Response values below */
uint8_t qualifier;
uint8_t hlength;
uint8_t dlength[3];
uint8_t rsvd2[8];
__be32 itt; /* Initiator Task Tag */
__be32 rtt; /* Reference Task Tag */
__be32 statsn;
__be32 exp_cmdsn;
__be32 max_cmdsn;
uint8_t rsvd3[12];
};
/* Response values */
#define ISCSI_TMF_RSP_COMPLETE 0x00
#define ISCSI_TMF_RSP_NO_TASK 0x01
#define ISCSI_TMF_RSP_NO_LUN 0x02
#define ISCSI_TMF_RSP_TASK_ALLEGIANT 0x03
#define ISCSI_TMF_RSP_NO_FAILOVER 0x04
#define ISCSI_TMF_RSP_NOT_SUPPORTED 0x05
#define ISCSI_TMF_RSP_AUTH_FAILED 0x06
#define ISCSI_TMF_RSP_REJECTED 0xff
/* Ready To Transfer Header */
struct iscsi_r2t_rsp {
uint8_t opcode;
uint8_t flags;
uint8_t rsvd2[2];
uint8_t hlength;
uint8_t dlength[3];
uint8_t lun[8];
__be32 itt; /* Initiator Task Tag */
__be32 ttt; /* Target Transfer Tag */
__be32 statsn;
__be32 exp_cmdsn;
__be32 max_cmdsn;
__be32 r2tsn;
__be32 data_offset;
__be32 data_length;
};
/* SCSI Data Hdr */
struct iscsi_data {
uint8_t opcode;
uint8_t flags;
uint8_t rsvd2[2];
uint8_t rsvd3;
uint8_t dlength[3];
uint8_t lun[8];
__be32 itt;
__be32 ttt;
__be32 rsvd4;
__be32 exp_statsn;
__be32 rsvd5;
__be32 datasn;
__be32 offset;
__be32 rsvd6;
/* Payload */
};
/* SCSI Data Response Hdr */
struct iscsi_data_rsp {
uint8_t opcode;
uint8_t flags;
uint8_t rsvd2;
uint8_t cmd_status;
uint8_t hlength;
uint8_t dlength[3];
uint8_t lun[8];
__be32 itt;
__be32 ttt;
__be32 statsn;
__be32 exp_cmdsn;
__be32 max_cmdsn;
__be32 datasn;
__be32 offset;
__be32 residual_count;
};
/* Data Response PDU flags */
#define ISCSI_FLAG_DATA_ACK 0x40
#define ISCSI_FLAG_DATA_OVERFLOW 0x04
#define ISCSI_FLAG_DATA_UNDERFLOW 0x02
#define ISCSI_FLAG_DATA_STATUS 0x01
/* Text Header */
struct iscsi_text {
uint8_t opcode;
uint8_t flags;
uint8_t rsvd2[2];
uint8_t hlength;
uint8_t dlength[3];
uint8_t rsvd4[8];
__be32 itt;
__be32 ttt;
__be32 cmdsn;
__be32 exp_statsn;
uint8_t rsvd5[16];
/* Text - key=value pairs */
};
#define ISCSI_FLAG_TEXT_CONTINUE 0x40
/* Text Response Header */
struct iscsi_text_rsp {
uint8_t opcode;
uint8_t flags;
uint8_t rsvd2[2];
uint8_t hlength;
uint8_t dlength[3];
uint8_t rsvd4[8];
__be32 itt;
__be32 ttt;
__be32 statsn;
__be32 exp_cmdsn;
__be32 max_cmdsn;
uint8_t rsvd5[12];
/* Text Response - key:value pairs */
};
/* Login Header */
struct iscsi_login {
uint8_t opcode;
uint8_t flags;
uint8_t max_version; /* Max. version supported */
uint8_t min_version; /* Min. version supported */
uint8_t hlength;
uint8_t dlength[3];
uint8_t isid[6]; /* Initiator Session ID */
__be16 tsih; /* Target Session Handle */
__be32 itt; /* Initiator Task Tag */
__be16 cid;
__be16 rsvd3;
__be32 cmdsn;
__be32 exp_statsn;
uint8_t rsvd5[16];
};
/* Login PDU flags */
#define ISCSI_FLAG_LOGIN_TRANSIT 0x80
#define ISCSI_FLAG_LOGIN_CONTINUE 0x40
#define ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK 0x0C /* 2 bits */
#define ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK 0x03 /* 2 bits */
#define ISCSI_LOGIN_CURRENT_STAGE(flags) \
((flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK) >> 2)
#define ISCSI_LOGIN_NEXT_STAGE(flags) \
(flags & ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK)
/* Login Response Header */
struct iscsi_login_rsp {
uint8_t opcode;
uint8_t flags;
uint8_t max_version; /* Max. version supported */
uint8_t active_version; /* Active version */
uint8_t hlength;
uint8_t dlength[3];
uint8_t isid[6]; /* Initiator Session ID */
__be16 tsih; /* Target Session Handle */
__be32 itt; /* Initiator Task Tag */
__be32 rsvd3;
__be32 statsn;
__be32 exp_cmdsn;
__be32 max_cmdsn;
uint8_t status_class; /* see Login RSP ststus classes below */
uint8_t status_detail; /* see Login RSP Status details below */
uint8_t rsvd4[10];
};
/* Login stage (phase) codes for CSG, NSG */
#define ISCSI_INITIAL_LOGIN_STAGE -1
#define ISCSI_SECURITY_NEGOTIATION_STAGE 0
#define ISCSI_OP_PARMS_NEGOTIATION_STAGE 1
#define ISCSI_FULL_FEATURE_PHASE 3
/* Login Status response classes */
#define ISCSI_STATUS_CLS_SUCCESS 0x00
#define ISCSI_STATUS_CLS_REDIRECT 0x01
#define ISCSI_STATUS_CLS_INITIATOR_ERR 0x02
#define ISCSI_STATUS_CLS_TARGET_ERR 0x03
/* Login Status response detail codes */
/* Class-0 (Success) */
#define ISCSI_LOGIN_STATUS_ACCEPT 0x00
/* Class-1 (Redirection) */
#define ISCSI_LOGIN_STATUS_TGT_MOVED_TEMP 0x01
#define ISCSI_LOGIN_STATUS_TGT_MOVED_PERM 0x02
/* Class-2 (Initiator Error) */
#define ISCSI_LOGIN_STATUS_INIT_ERR 0x00
#define ISCSI_LOGIN_STATUS_AUTH_FAILED 0x01
#define ISCSI_LOGIN_STATUS_TGT_FORBIDDEN 0x02
#define ISCSI_LOGIN_STATUS_TGT_NOT_FOUND 0x03
#define ISCSI_LOGIN_STATUS_TGT_REMOVED 0x04
#define ISCSI_LOGIN_STATUS_NO_VERSION 0x05
#define ISCSI_LOGIN_STATUS_ISID_ERROR 0x06
#define ISCSI_LOGIN_STATUS_MISSING_FIELDS 0x07
#define ISCSI_LOGIN_STATUS_CONN_ADD_FAILED 0x08
#define ISCSI_LOGIN_STATUS_NO_SESSION_TYPE 0x09
#define ISCSI_LOGIN_STATUS_NO_SESSION 0x0a
#define ISCSI_LOGIN_STATUS_INVALID_REQUEST 0x0b
/* Class-3 (Target Error) */
#define ISCSI_LOGIN_STATUS_TARGET_ERROR 0x00
#define ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE 0x01
#define ISCSI_LOGIN_STATUS_NO_RESOURCES 0x02
/* Logout Header */
struct iscsi_logout {
uint8_t opcode;
uint8_t flags;
uint8_t rsvd1[2];
uint8_t hlength;
uint8_t dlength[3];
uint8_t rsvd2[8];
__be32 itt; /* Initiator Task Tag */
__be16 cid;
uint8_t rsvd3[2];
__be32 cmdsn;
__be32 exp_statsn;
uint8_t rsvd4[16];
};
/* Logout PDU flags */
#define ISCSI_FLAG_LOGOUT_REASON_MASK 0x7F
/* logout reason_code values */
#define ISCSI_LOGOUT_REASON_CLOSE_SESSION 0
#define ISCSI_LOGOUT_REASON_CLOSE_CONNECTION 1
#define ISCSI_LOGOUT_REASON_RECOVERY 2
#define ISCSI_LOGOUT_REASON_AEN_REQUEST 3
/* Logout Response Header */
struct iscsi_logout_rsp {
uint8_t opcode;
uint8_t flags;
uint8_t response; /* see Logout response values below */
uint8_t rsvd2;
uint8_t hlength;
uint8_t dlength[3];
uint8_t rsvd3[8];
__be32 itt; /* Initiator Task Tag */
__be32 rsvd4;
__be32 statsn;
__be32 exp_cmdsn;
__be32 max_cmdsn;
__be32 rsvd5;
__be16 t2wait;
__be16 t2retain;
__be32 rsvd6;
};
/* logout response status values */
#define ISCSI_LOGOUT_SUCCESS 0
#define ISCSI_LOGOUT_CID_NOT_FOUND 1
#define ISCSI_LOGOUT_RECOVERY_UNSUPPORTED 2
#define ISCSI_LOGOUT_CLEANUP_FAILED 3
/* SNACK Header */
struct iscsi_snack {
uint8_t opcode;
uint8_t flags;
uint8_t rsvd2[14];
__be32 itt;
__be32 begrun;
__be32 runlength;
__be32 exp_statsn;
__be32 rsvd3;
__be32 exp_datasn;
uint8_t rsvd6[8];
};
/* SNACK PDU flags */
#define ISCSI_FLAG_SNACK_TYPE_MASK 0x0F /* 4 bits */
/* Reject Message Header */
struct iscsi_reject {
uint8_t opcode;
uint8_t flags;
uint8_t reason;
uint8_t rsvd2;
uint8_t hlength;
uint8_t dlength[3];
uint8_t rsvd3[8];
__be32 ffffffff;
uint8_t rsvd4[4];
__be32 statsn;
__be32 exp_cmdsn;
__be32 max_cmdsn;
__be32 datasn;
uint8_t rsvd5[8];
/* Text - Rejected hdr */
};
/* Reason for Reject */
#define ISCSI_REASON_CMD_BEFORE_LOGIN 1
#define ISCSI_REASON_DATA_DIGEST_ERROR 2
#define ISCSI_REASON_DATA_SNACK_REJECT 3
#define ISCSI_REASON_PROTOCOL_ERROR 4
#define ISCSI_REASON_CMD_NOT_SUPPORTED 5
#define ISCSI_REASON_IMM_CMD_REJECT 6
#define ISCSI_REASON_TASK_IN_PROGRESS 7
#define ISCSI_REASON_INVALID_SNACK 8
#define ISCSI_REASON_BOOKMARK_INVALID 9
#define ISCSI_REASON_BOOKMARK_NO_RESOURCES 10
#define ISCSI_REASON_NEGOTIATION_RESET 11
/* Max. number of Key=Value pairs in a text message */
#define MAX_KEY_VALUE_PAIRS 8192
/* maximum length for text keys/values */
#define KEY_MAXLEN 64
#define VALUE_MAXLEN 255
#define TARGET_NAME_MAXLEN VALUE_MAXLEN
#define DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH 8192
/************************* RFC 3720 End *****************************/
#endif /* ISCSI_PROTO_H */
/* /*
* iSCSI transport class definitions * iSCSI transport class definitions
* *
* Copyright (C) IBM Corporation, 2004 * Copyright (C) IBM Corporation, 2004
* Copyright (C) Mike Christie, 2004 * Copyright (C) Mike Christie, 2004 - 2005
* Copyright (C) Dmitry Yusupov, 2004 - 2005
* Copyright (C) Alex Aizman, 2004 - 2005
* *
* This program is free software; you can redistribute it and/or modify * This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by * it under the terms of the GNU General Public License as published by
...@@ -21,158 +23,64 @@ ...@@ -21,158 +23,64 @@
#ifndef SCSI_TRANSPORT_ISCSI_H #ifndef SCSI_TRANSPORT_ISCSI_H
#define SCSI_TRANSPORT_ISCSI_H #define SCSI_TRANSPORT_ISCSI_H
#include <linux/config.h> #include <scsi/iscsi_if.h>
#include <linux/in6.h>
#include <linux/in.h>
struct scsi_transport_template;
struct iscsi_class_session { /**
uint8_t isid[6]; * struct iscsi_transport - iSCSI Transport template
uint16_t tsih; *
int header_digest; /* 1 CRC32, 0 None */ * @name: transport name
int data_digest; /* 1 CRC32, 0 None */ * @caps: iSCSI Data-Path capabilities
uint16_t tpgt; * @create_session: create new iSCSI session object
union { * @destroy_session: destroy existing iSCSI session object
struct in6_addr sin6_addr; * @create_conn: create new iSCSI connection
struct in_addr sin_addr; * @bind_conn: associate this connection with existing iSCSI session
} u; * and specified transport descriptor
sa_family_t addr_type; /* must be AF_INET or AF_INET6 */ * @destroy_conn: destroy inactive iSCSI connection
uint16_t port; /* must be in network byte order */ * @set_param: set iSCSI Data-Path operational parameter
int initial_r2t; /* 1 Yes, 0 No */ * @start_conn: set connection to be operational
int immediate_data; /* 1 Yes, 0 No */ * @stop_conn: suspend/recover/terminate connection
uint32_t max_recv_data_segment_len; * @send_pdu: send iSCSI PDU, Login, Logout, NOP-Out, Reject, Text.
uint32_t max_burst_len; *
uint32_t first_burst_len; * Template API provided by iSCSI Transport
uint16_t def_time2wait; */
uint16_t def_time2retain; struct iscsi_transport {
uint16_t max_outstanding_r2t; struct module *owner;
int data_pdu_in_order; /* 1 Yes, 0 No */ char *name;
int data_sequence_in_order; /* 1 Yes, 0 No */ unsigned int caps;
int erl; struct scsi_host_template *host_template;
int hostdata_size;
int max_lun;
unsigned int max_conn;
unsigned int max_cmd_len;
iscsi_sessionh_t (*create_session) (uint32_t initial_cmdsn,
struct Scsi_Host *shost);
void (*destroy_session) (iscsi_sessionh_t session);
iscsi_connh_t (*create_conn) (iscsi_sessionh_t session, uint32_t cid);
int (*bind_conn) (iscsi_sessionh_t session, iscsi_connh_t conn,
uint32_t transport_fd, int is_leading);
int (*start_conn) (iscsi_connh_t conn);
void (*stop_conn) (iscsi_connh_t conn, int flag);
void (*destroy_conn) (iscsi_connh_t conn);
int (*set_param) (iscsi_connh_t conn, enum iscsi_param param,
uint32_t value);
int (*get_param) (iscsi_connh_t conn, enum iscsi_param param,
uint32_t *value);
int (*send_pdu) (iscsi_connh_t conn, struct iscsi_hdr *hdr,
char *data, uint32_t data_size);
void (*get_stats) (iscsi_connh_t conn, struct iscsi_stats *stats);
}; };
/* /*
* accessor macros * transport registration upcalls
*/ */
#define iscsi_isid(x) \ extern int iscsi_register_transport(struct iscsi_transport *tt);
(((struct iscsi_class_session *)&(x)->starget_data)->isid) extern int iscsi_unregister_transport(struct iscsi_transport *tt);
#define iscsi_tsih(x) \
(((struct iscsi_class_session *)&(x)->starget_data)->tsih)
#define iscsi_header_digest(x) \
(((struct iscsi_class_session *)&(x)->starget_data)->header_digest)
#define iscsi_data_digest(x) \
(((struct iscsi_class_session *)&(x)->starget_data)->data_digest)
#define iscsi_port(x) \
(((struct iscsi_class_session *)&(x)->starget_data)->port)
#define iscsi_addr_type(x) \
(((struct iscsi_class_session *)&(x)->starget_data)->addr_type)
#define iscsi_sin_addr(x) \
(((struct iscsi_class_session *)&(x)->starget_data)->u.sin_addr)
#define iscsi_sin6_addr(x) \
(((struct iscsi_class_session *)&(x)->starget_data)->u.sin6_addr)
#define iscsi_tpgt(x) \
(((struct iscsi_class_session *)&(x)->starget_data)->tpgt)
#define iscsi_initial_r2t(x) \
(((struct iscsi_class_session *)&(x)->starget_data)->initial_r2t)
#define iscsi_immediate_data(x) \
(((struct iscsi_class_session *)&(x)->starget_data)->immediate_data)
#define iscsi_max_recv_data_segment_len(x) \
(((struct iscsi_class_session *)&(x)->starget_data)->max_recv_data_segment_len)
#define iscsi_max_burst_len(x) \
(((struct iscsi_class_session *)&(x)->starget_data)->max_burst_len)
#define iscsi_first_burst_len(x) \
(((struct iscsi_class_session *)&(x)->starget_data)->first_burst_len)
#define iscsi_def_time2wait(x) \
(((struct iscsi_class_session *)&(x)->starget_data)->def_time2wait)
#define iscsi_def_time2retain(x) \
(((struct iscsi_class_session *)&(x)->starget_data)->def_time2retain)
#define iscsi_max_outstanding_r2t(x) \
(((struct iscsi_class_session *)&(x)->starget_data)->max_outstanding_r2t)
#define iscsi_data_pdu_in_order(x) \
(((struct iscsi_class_session *)&(x)->starget_data)->data_pdu_in_order)
#define iscsi_data_sequence_in_order(x) \
(((struct iscsi_class_session *)&(x)->starget_data)->data_sequence_in_order)
#define iscsi_erl(x) \
(((struct iscsi_class_session *)&(x)->starget_data)->erl)
/* /*
* The functions by which the transport class and the driver communicate * control plane upcalls
*/ */
struct iscsi_function_template { extern void iscsi_conn_error(iscsi_connh_t conn, enum iscsi_err error);
/* extern int iscsi_recv_pdu(iscsi_connh_t conn, struct iscsi_hdr *hdr,
* target attrs char *data, uint32_t data_size);
*/
void (*get_isid)(struct scsi_target *);
void (*get_tsih)(struct scsi_target *);
void (*get_header_digest)(struct scsi_target *);
void (*get_data_digest)(struct scsi_target *);
void (*get_port)(struct scsi_target *);
void (*get_tpgt)(struct scsi_target *);
/*
* In get_ip_address the lld must set the address and
* the address type
*/
void (*get_ip_address)(struct scsi_target *);
/*
* The lld should snprintf the name or alias to the buffer
*/
ssize_t (*get_target_name)(struct scsi_target *, char *, ssize_t);
ssize_t (*get_target_alias)(struct scsi_target *, char *, ssize_t);
void (*get_initial_r2t)(struct scsi_target *);
void (*get_immediate_data)(struct scsi_target *);
void (*get_max_recv_data_segment_len)(struct scsi_target *);
void (*get_max_burst_len)(struct scsi_target *);
void (*get_first_burst_len)(struct scsi_target *);
void (*get_def_time2wait)(struct scsi_target *);
void (*get_def_time2retain)(struct scsi_target *);
void (*get_max_outstanding_r2t)(struct scsi_target *);
void (*get_data_pdu_in_order)(struct scsi_target *);
void (*get_data_sequence_in_order)(struct scsi_target *);
void (*get_erl)(struct scsi_target *);
/*
* host atts
*/
/*
* The lld should snprintf the name or alias to the buffer
*/
ssize_t (*get_initiator_alias)(struct Scsi_Host *, char *, ssize_t);
ssize_t (*get_initiator_name)(struct Scsi_Host *, char *, ssize_t);
/*
* The driver sets these to tell the transport class it
* wants the attributes displayed in sysfs. If the show_ flag
* is not set, the attribute will be private to the transport
* class. We could probably just test if a get_ fn was set
* since we only use the values for sysfs but this is how
* fc does it too.
*/
unsigned long show_isid:1;
unsigned long show_tsih:1;
unsigned long show_header_digest:1;
unsigned long show_data_digest:1;
unsigned long show_port:1;
unsigned long show_tpgt:1;
unsigned long show_ip_address:1;
unsigned long show_target_name:1;
unsigned long show_target_alias:1;
unsigned long show_initial_r2t:1;
unsigned long show_immediate_data:1;
unsigned long show_max_recv_data_segment_len:1;
unsigned long show_max_burst_len:1;
unsigned long show_first_burst_len:1;
unsigned long show_def_time2wait:1;
unsigned long show_def_time2retain:1;
unsigned long show_max_outstanding_r2t:1;
unsigned long show_data_pdu_in_order:1;
unsigned long show_data_sequence_in_order:1;
unsigned long show_erl:1;
unsigned long show_initiator_name:1;
unsigned long show_initiator_alias:1;
};
struct scsi_transport_template *iscsi_attach_transport(struct iscsi_function_template *);
void iscsi_release_transport(struct scsi_transport_template *);
#endif #endif
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