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Commit 6f7efaab authored by kxie@chelsio.com's avatar kxie@chelsio.com Committed by James Bottomley
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[SCSI] cxgb3i: change cxgb3i to use libcxgbi 

Signed-off-by: default avatarKaren Xie <kxie@chelsio.com>
Reviewed-by: default avatarMike Christie <michaelc@cs.wisc.edu>
Signed-off-by: default avatarJames Bottomley <James.Bottomley@suse.de>
parent 7b36b6e0
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Showing with 1488 additions and 5083 deletions
drivers/scsi/Kconfig
View file @ 6f7efaab
......@@ -378,7 +378,6 @@ config ISCSI_BOOT_SYSFS
via sysfs to userspace. If you wish to export this information,
say Y. Otherwise, say N.
source "drivers/scsi/cxgb3i/Kconfig"
source "drivers/scsi/cxgbi/Kconfig"
source "drivers/scsi/bnx2i/Kconfig"
source "drivers/scsi/be2iscsi/Kconfig"
......
drivers/scsi/Makefile
View file @ 6f7efaab
......@@ -133,7 +133,7 @@ obj-$(CONFIG_SCSI_HPTIOP) += hptiop.o
obj-$(CONFIG_SCSI_STEX) += stex.o
obj-$(CONFIG_SCSI_MVSAS) += mvsas/
obj-$(CONFIG_PS3_ROM) += ps3rom.o
obj-$(CONFIG_SCSI_CXGB3_ISCSI) += libiscsi.o libiscsi_tcp.o cxgb3i/
obj-$(CONFIG_SCSI_CXGB3_ISCSI) += libiscsi.o libiscsi_tcp.o cxgbi/
obj-$(CONFIG_SCSI_CXGB4_ISCSI) += libiscsi.o libiscsi_tcp.o cxgbi/
obj-$(CONFIG_SCSI_BNX2_ISCSI) += libiscsi.o bnx2i/
obj-$(CONFIG_BE2ISCSI) += libiscsi.o be2iscsi/
......
drivers/scsi/cxgb3i/cxgb3i.h deleted 100644 → 0
View file @ 7b36b6e0
/*
* cxgb3i.h: Chelsio S3xx iSCSI driver.
*
* Copyright (c) 2008 Chelsio Communications, Inc.
*
* 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.
*
* Written by: Karen Xie (kxie@chelsio.com)
*/
#ifndef __CXGB3I_H__
#define __CXGB3I_H__
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/list.h>
#include <linux/netdevice.h>
#include <linux/scatterlist.h>
#include <linux/skbuff.h>
#include <scsi/libiscsi_tcp.h>
/* from cxgb3 LLD */
#include "common.h"
#include "t3_cpl.h"
#include "t3cdev.h"
#include "cxgb3_ctl_defs.h"
#include "cxgb3_offload.h"
#include "firmware_exports.h"
#include "cxgb3i_offload.h"
#include "cxgb3i_ddp.h"
#define CXGB3I_SCSI_HOST_QDEPTH 1024
#define CXGB3I_MAX_TARGET CXGB3I_MAX_CONN
#define CXGB3I_MAX_LUN 512
#define ISCSI_PDU_NONPAYLOAD_MAX \
(sizeof(struct iscsi_hdr) + ISCSI_MAX_AHS_SIZE + 2*ISCSI_DIGEST_SIZE)
struct cxgb3i_adapter;
struct cxgb3i_hba;
struct cxgb3i_endpoint;
/**
* struct cxgb3i_hba - cxgb3i iscsi structure (per port)
*
* @snic: cxgb3i adapter containing this port
* @ndev: pointer to netdev structure
* @shost: pointer to scsi host structure
*/
struct cxgb3i_hba {
struct cxgb3i_adapter *snic;
struct net_device *ndev;
struct Scsi_Host *shost;
};
/**
* struct cxgb3i_adapter - cxgb3i adapter structure (per pci)
*
* @listhead: list head to link elements
* @lock: lock for this structure
* @tdev: pointer to t3cdev used by cxgb3 driver
* @pdev: pointer to pci dev
* @hba_cnt: # of hbas (the same as # of ports)
* @hba: all the hbas on this adapter
* @flags: bit flag for adapter event/status
* @tx_max_size: max. tx packet size supported
* @rx_max_size: max. rx packet size supported
* @tag_format: ddp tag format settings
*/
#define CXGB3I_ADAPTER_FLAG_RESET 0x1
struct cxgb3i_adapter {
struct list_head list_head;
spinlock_t lock;
struct t3cdev *tdev;
struct pci_dev *pdev;
unsigned char hba_cnt;
struct cxgb3i_hba *hba[MAX_NPORTS];
unsigned int flags;
unsigned int tx_max_size;
unsigned int rx_max_size;
struct cxgb3i_tag_format tag_format;
};
/**
* struct cxgb3i_conn - cxgb3i iscsi connection
*
* @listhead: list head to link elements
* @cep: pointer to iscsi_endpoint structure
* @conn: pointer to iscsi_conn structure
* @hba: pointer to the hba this conn. is going through
* @task_idx_bits: # of bits needed for session->cmds_max
*/
struct cxgb3i_conn {
struct list_head list_head;
struct cxgb3i_endpoint *cep;
struct iscsi_conn *conn;
struct cxgb3i_hba *hba;
unsigned int task_idx_bits;
};
/**
* struct cxgb3i_endpoint - iscsi tcp endpoint
*
* @c3cn: the h/w tcp connection representation
* @hba: pointer to the hba this conn. is going through
* @cconn: pointer to the associated cxgb3i iscsi connection
*/
struct cxgb3i_endpoint {
struct s3_conn *c3cn;
struct cxgb3i_hba *hba;
struct cxgb3i_conn *cconn;
};
/**
* struct cxgb3i_task_data - private iscsi task data
*
* @nr_frags: # of coalesced page frags (from scsi sgl)
* @frags: coalesced page frags (from scsi sgl)
* @skb: tx pdu skb
* @offset: data offset for the next pdu
* @count: max. possible pdu payload
* @sgoffset: offset to the first sg entry for a given offset
*/
#define MAX_PDU_FRAGS ((ULP2_MAX_PDU_PAYLOAD + 512 - 1) / 512)
struct cxgb3i_task_data {
unsigned short nr_frags;
skb_frag_t frags[MAX_PDU_FRAGS];
struct sk_buff *skb;
unsigned int offset;
unsigned int count;
unsigned int sgoffset;
};
int cxgb3i_iscsi_init(void);
void cxgb3i_iscsi_cleanup(void);
struct cxgb3i_adapter *cxgb3i_adapter_find_by_tdev(struct t3cdev *);
void cxgb3i_adapter_open(struct t3cdev *);
void cxgb3i_adapter_close(struct t3cdev *);
struct cxgb3i_hba *cxgb3i_hba_host_add(struct cxgb3i_adapter *,
struct net_device *);
void cxgb3i_hba_host_remove(struct cxgb3i_hba *);
int cxgb3i_pdu_init(void);
void cxgb3i_pdu_cleanup(void);
void cxgb3i_conn_cleanup_task(struct iscsi_task *);
int cxgb3i_conn_alloc_pdu(struct iscsi_task *, u8);
int cxgb3i_conn_init_pdu(struct iscsi_task *, unsigned int, unsigned int);
int cxgb3i_conn_xmit_pdu(struct iscsi_task *);
void cxgb3i_release_itt(struct iscsi_task *task, itt_t hdr_itt);
int cxgb3i_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt);
#endif
drivers/scsi/cxgb3i/cxgb3i_ddp.c deleted 100644 → 0
View file @ 7b36b6e0
/*
* cxgb3i_ddp.c: Chelsio S3xx iSCSI DDP Manager.
*
* Copyright (c) 2008 Chelsio Communications, Inc.
*
* 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.
*
* Written by: Karen Xie (kxie@chelsio.com)
*/
#include <linux/slab.h>
#include <linux/skbuff.h>
#include <linux/scatterlist.h>
/* from cxgb3 LLD */
#include "common.h"
#include "t3_cpl.h"
#include "t3cdev.h"
#include "cxgb3_ctl_defs.h"
#include "cxgb3_offload.h"
#include "firmware_exports.h"
#include "cxgb3i_ddp.h"
#define ddp_log_error(fmt...) printk(KERN_ERR "cxgb3i_ddp: ERR! " fmt)
#define ddp_log_warn(fmt...) printk(KERN_WARNING "cxgb3i_ddp: WARN! " fmt)
#define ddp_log_info(fmt...) printk(KERN_INFO "cxgb3i_ddp: " fmt)
#ifdef __DEBUG_CXGB3I_DDP__
#define ddp_log_debug(fmt, args...) \
printk(KERN_INFO "cxgb3i_ddp: %s - " fmt, __func__ , ## args)
#else
#define ddp_log_debug(fmt...)
#endif
/*
* iSCSI Direct Data Placement
*
* T3 h/w can directly place the iSCSI Data-In or Data-Out PDU's payload into
* pre-posted final destination host-memory buffers based on the Initiator
* Task Tag (ITT) in Data-In or Target Task Tag (TTT) in Data-Out PDUs.
*
* The host memory address is programmed into h/w in the format of pagepod
* entries.
* The location of the pagepod entry is encoded into ddp tag which is used or
* is the base for ITT/TTT.
*/
#define DDP_PGIDX_MAX 4
#define DDP_THRESHOLD 2048
static unsigned char ddp_page_order[DDP_PGIDX_MAX] = {0, 1, 2, 4};
static unsigned char ddp_page_shift[DDP_PGIDX_MAX] = {12, 13, 14, 16};
static unsigned char page_idx = DDP_PGIDX_MAX;
/*
* functions to program the pagepod in h/w
*/
static inline void ulp_mem_io_set_hdr(struct sk_buff *skb, unsigned int addr)
{
struct ulp_mem_io *req = (struct ulp_mem_io *)skb->head;
req->wr.wr_lo = 0;
req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_BYPASS));
req->cmd_lock_addr = htonl(V_ULP_MEMIO_ADDR(addr >> 5) |
V_ULPTX_CMD(ULP_MEM_WRITE));
req->len = htonl(V_ULP_MEMIO_DATA_LEN(PPOD_SIZE >> 5) |
V_ULPTX_NFLITS((PPOD_SIZE >> 3) + 1));
}
static int set_ddp_map(struct cxgb3i_ddp_info *ddp, struct pagepod_hdr *hdr,
unsigned int idx, unsigned int npods,
struct cxgb3i_gather_list *gl)
{
unsigned int pm_addr = (idx << PPOD_SIZE_SHIFT) + ddp->llimit;
int i;
for (i = 0; i < npods; i++, idx++, pm_addr += PPOD_SIZE) {
struct sk_buff *skb = ddp->gl_skb[idx];
struct pagepod *ppod;
int j, pidx;
/* hold on to the skb until we clear the ddp mapping */
skb_get(skb);
ulp_mem_io_set_hdr(skb, pm_addr);
ppod = (struct pagepod *)
(skb->head + sizeof(struct ulp_mem_io));
memcpy(&(ppod->hdr), hdr, sizeof(struct pagepod));
for (pidx = 4 * i, j = 0; j < 5; ++j, ++pidx)
ppod->addr[j] = pidx < gl->nelem ?
cpu_to_be64(gl->phys_addr[pidx]) : 0UL;
skb->priority = CPL_PRIORITY_CONTROL;
cxgb3_ofld_send(ddp->tdev, skb);
}
return 0;
}
static void clear_ddp_map(struct cxgb3i_ddp_info *ddp, unsigned int tag,
unsigned int idx, unsigned int npods)
{
unsigned int pm_addr = (idx << PPOD_SIZE_SHIFT) + ddp->llimit;
int i;
for (i = 0; i < npods; i++, idx++, pm_addr += PPOD_SIZE) {
struct sk_buff *skb = ddp->gl_skb[idx];
if (!skb) {
ddp_log_error("ddp tag 0x%x, 0x%x, %d/%u, skb NULL.\n",
tag, idx, i, npods);
continue;
}
ddp->gl_skb[idx] = NULL;
memset((skb->head + sizeof(struct ulp_mem_io)), 0, PPOD_SIZE);
ulp_mem_io_set_hdr(skb, pm_addr);
skb->priority = CPL_PRIORITY_CONTROL;
cxgb3_ofld_send(ddp->tdev, skb);
}
}
static inline int ddp_find_unused_entries(struct cxgb3i_ddp_info *ddp,
unsigned int start, unsigned int max,
unsigned int count,
struct cxgb3i_gather_list *gl)
{
unsigned int i, j, k;
/* not enough entries */
if ((max - start) < count)
return -EBUSY;
max -= count;
spin_lock(&ddp->map_lock);
for (i = start; i < max;) {
for (j = 0, k = i; j < count; j++, k++) {
if (ddp->gl_map[k])
break;
}
if (j == count) {
for (j = 0, k = i; j < count; j++, k++)
ddp->gl_map[k] = gl;
spin_unlock(&ddp->map_lock);
return i;
}
i += j + 1;
}
spin_unlock(&ddp->map_lock);
return -EBUSY;
}
static inline void ddp_unmark_entries(struct cxgb3i_ddp_info *ddp,
int start, int count)
{
spin_lock(&ddp->map_lock);
memset(&ddp->gl_map[start], 0,
count * sizeof(struct cxgb3i_gather_list *));
spin_unlock(&ddp->map_lock);
}
static inline void ddp_free_gl_skb(struct cxgb3i_ddp_info *ddp,
int idx, int count)
{
int i;
for (i = 0; i < count; i++, idx++)
if (ddp->gl_skb[idx]) {
kfree_skb(ddp->gl_skb[idx]);
ddp->gl_skb[idx] = NULL;
}
}
static inline int ddp_alloc_gl_skb(struct cxgb3i_ddp_info *ddp, int idx,
int count, gfp_t gfp)
{
int i;
for (i = 0; i < count; i++) {
struct sk_buff *skb = alloc_skb(sizeof(struct ulp_mem_io) +
PPOD_SIZE, gfp);
if (skb) {
ddp->gl_skb[idx + i] = skb;
skb_put(skb, sizeof(struct ulp_mem_io) + PPOD_SIZE);
} else {
ddp_free_gl_skb(ddp, idx, i);
return -ENOMEM;
}
}
return 0;
}
/**
* cxgb3i_ddp_find_page_index - return ddp page index for a given page size
* @pgsz: page size
* return the ddp page index, if no match is found return DDP_PGIDX_MAX.
*/
int cxgb3i_ddp_find_page_index(unsigned long pgsz)
{
int i;
for (i = 0; i < DDP_PGIDX_MAX; i++) {
if (pgsz == (1UL << ddp_page_shift[i]))
return i;
}
ddp_log_debug("ddp page size 0x%lx not supported.\n", pgsz);
return DDP_PGIDX_MAX;
}
/**
* cxgb3i_ddp_adjust_page_table - adjust page table with PAGE_SIZE
* return the ddp page index, if no match is found return DDP_PGIDX_MAX.
*/
int cxgb3i_ddp_adjust_page_table(void)
{
int i;
unsigned int base_order, order;
if (PAGE_SIZE < (1UL << ddp_page_shift[0])) {
ddp_log_info("PAGE_SIZE 0x%lx too small, min. 0x%lx.\n",
PAGE_SIZE, 1UL << ddp_page_shift[0]);
return -EINVAL;
}
base_order = get_order(1UL << ddp_page_shift[0]);
order = get_order(1 << PAGE_SHIFT);
for (i = 0; i < DDP_PGIDX_MAX; i++) {
/* first is the kernel page size, then just doubling the size */
ddp_page_order[i] = order - base_order + i;
ddp_page_shift[i] = PAGE_SHIFT + i;
}
return 0;
}
static inline void ddp_gl_unmap(struct pci_dev *pdev,
struct cxgb3i_gather_list *gl)
{
int i;
for (i = 0; i < gl->nelem; i++)
pci_unmap_page(pdev, gl->phys_addr[i], PAGE_SIZE,
PCI_DMA_FROMDEVICE);
}
static inline int ddp_gl_map(struct pci_dev *pdev,
struct cxgb3i_gather_list *gl)
{
int i;
for (i = 0; i < gl->nelem; i++) {
gl->phys_addr[i] = pci_map_page(pdev, gl->pages[i], 0,
PAGE_SIZE,
PCI_DMA_FROMDEVICE);
if (unlikely(pci_dma_mapping_error(pdev, gl->phys_addr[i])))
goto unmap;
}
return i;
unmap:
if (i) {
unsigned int nelem = gl->nelem;
gl->nelem = i;
ddp_gl_unmap(pdev, gl);
gl->nelem = nelem;
}
return -ENOMEM;
}
/**
* cxgb3i_ddp_make_gl - build ddp page buffer list
* @xferlen: total buffer length
* @sgl: page buffer scatter-gather list
* @sgcnt: # of page buffers
* @pdev: pci_dev, used for pci map
* @gfp: allocation mode
*
* construct a ddp page buffer list from the scsi scattergather list.
* coalesce buffers as much as possible, and obtain dma addresses for
* each page.
*
* Return the cxgb3i_gather_list constructed from the page buffers if the
* memory can be used for ddp. Return NULL otherwise.
*/
struct cxgb3i_gather_list *cxgb3i_ddp_make_gl(unsigned int xferlen,
struct scatterlist *sgl,
unsigned int sgcnt,
struct pci_dev *pdev,
gfp_t gfp)
{
struct cxgb3i_gather_list *gl;
struct scatterlist *sg = sgl;
struct page *sgpage = sg_page(sg);
unsigned int sglen = sg->length;
unsigned int sgoffset = sg->offset;
unsigned int npages = (xferlen + sgoffset + PAGE_SIZE - 1) >>
PAGE_SHIFT;
int i = 1, j = 0;
if (xferlen < DDP_THRESHOLD) {
ddp_log_debug("xfer %u < threshold %u, no ddp.\n",
xferlen, DDP_THRESHOLD);
return NULL;
}
gl = kzalloc(sizeof(struct cxgb3i_gather_list) +
npages * (sizeof(dma_addr_t) + sizeof(struct page *)),
gfp);
if (!gl)
return NULL;
gl->pages = (struct page **)&gl->phys_addr[npages];
gl->length = xferlen;
gl->offset = sgoffset;
gl->pages[0] = sgpage;
sg = sg_next(sg);
while (sg) {
struct page *page = sg_page(sg);
if (sgpage == page && sg->offset == sgoffset + sglen)
sglen += sg->length;
else {
/* make sure the sgl is fit for ddp:
* each has the same page size, and
* all of the middle pages are used completely
*/
if ((j && sgoffset) ||
((i != sgcnt - 1) &&
((sglen + sgoffset) & ~PAGE_MASK)))
goto error_out;
j++;
if (j == gl->nelem || sg->offset)
goto error_out;
gl->pages[j] = page;
sglen = sg->length;
sgoffset = sg->offset;
sgpage = page;
}
i++;
sg = sg_next(sg);
}
gl->nelem = ++j;
if (ddp_gl_map(pdev, gl) < 0)
goto error_out;
return gl;
error_out:
kfree(gl);
return NULL;
}
/**
* cxgb3i_ddp_release_gl - release a page buffer list
* @gl: a ddp page buffer list
* @pdev: pci_dev used for pci_unmap
* free a ddp page buffer list resulted from cxgb3i_ddp_make_gl().
*/
void cxgb3i_ddp_release_gl(struct cxgb3i_gather_list *gl,
struct pci_dev *pdev)
{
ddp_gl_unmap(pdev, gl);
kfree(gl);
}
/**
* cxgb3i_ddp_tag_reserve - set up ddp for a data transfer
* @tdev: t3cdev adapter
* @tid: connection id
* @tformat: tag format
* @tagp: contains s/w tag initially, will be updated with ddp/hw tag
* @gl: the page momory list
* @gfp: allocation mode
*
* ddp setup for a given page buffer list and construct the ddp tag.
* return 0 if success, < 0 otherwise.
*/
int cxgb3i_ddp_tag_reserve(struct t3cdev *tdev, unsigned int tid,
struct cxgb3i_tag_format *tformat, u32 *tagp,
struct cxgb3i_gather_list *gl, gfp_t gfp)
{
struct cxgb3i_ddp_info *ddp = tdev->ulp_iscsi;
struct pagepod_hdr hdr;
unsigned int npods;
int idx = -1;
int err = -ENOMEM;
u32 sw_tag = *tagp;
u32 tag;
if (page_idx >= DDP_PGIDX_MAX || !ddp || !gl || !gl->nelem ||
gl->length < DDP_THRESHOLD) {
ddp_log_debug("pgidx %u, xfer %u/%u, NO ddp.\n",
page_idx, gl->length, DDP_THRESHOLD);
return -EINVAL;
}
npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
if (ddp->idx_last == ddp->nppods)
idx = ddp_find_unused_entries(ddp, 0, ddp->nppods, npods, gl);
else {
idx = ddp_find_unused_entries(ddp, ddp->idx_last + 1,
ddp->nppods, npods, gl);
if (idx < 0 && ddp->idx_last >= npods) {
idx = ddp_find_unused_entries(ddp, 0,
min(ddp->idx_last + npods, ddp->nppods),
npods, gl);
}
}
if (idx < 0) {
ddp_log_debug("xferlen %u, gl %u, npods %u NO DDP.\n",
gl->length, gl->nelem, npods);
return idx;
}
err = ddp_alloc_gl_skb(ddp, idx, npods, gfp);
if (err < 0)
goto unmark_entries;
tag = cxgb3i_ddp_tag_base(tformat, sw_tag);
tag |= idx << PPOD_IDX_SHIFT;
hdr.rsvd = 0;
hdr.vld_tid = htonl(F_PPOD_VALID | V_PPOD_TID(tid));
hdr.pgsz_tag_clr = htonl(tag & ddp->rsvd_tag_mask);
hdr.maxoffset = htonl(gl->length);
hdr.pgoffset = htonl(gl->offset);
err = set_ddp_map(ddp, &hdr, idx, npods, gl);
if (err < 0)
goto free_gl_skb;
ddp->idx_last = idx;
ddp_log_debug("xfer %u, gl %u,%u, tid 0x%x, 0x%x -> 0x%x(%u,%u).\n",
gl->length, gl->nelem, gl->offset, tid, sw_tag, tag,
idx, npods);
*tagp = tag;
return 0;
free_gl_skb:
ddp_free_gl_skb(ddp, idx, npods);
unmark_entries:
ddp_unmark_entries(ddp, idx, npods);
return err;
}
/**
* cxgb3i_ddp_tag_release - release a ddp tag
* @tdev: t3cdev adapter
* @tag: ddp tag
* ddp cleanup for a given ddp tag and release all the resources held
*/
void cxgb3i_ddp_tag_release(struct t3cdev *tdev, u32 tag)
{
struct cxgb3i_ddp_info *ddp = tdev->ulp_iscsi;
u32 idx;
if (!ddp) {
ddp_log_error("release ddp tag 0x%x, ddp NULL.\n", tag);
return;
}
idx = (tag >> PPOD_IDX_SHIFT) & ddp->idx_mask;
if (idx < ddp->nppods) {
struct cxgb3i_gather_list *gl = ddp->gl_map[idx];
unsigned int npods;
if (!gl || !gl->nelem) {
ddp_log_error("release 0x%x, idx 0x%x, gl 0x%p, %u.\n",
tag, idx, gl, gl ? gl->nelem : 0);
return;
}
npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
ddp_log_debug("ddp tag 0x%x, release idx 0x%x, npods %u.\n",
tag, idx, npods);
clear_ddp_map(ddp, tag, idx, npods);
ddp_unmark_entries(ddp, idx, npods);
cxgb3i_ddp_release_gl(gl, ddp->pdev);
} else
ddp_log_error("ddp tag 0x%x, idx 0x%x > max 0x%x.\n",
tag, idx, ddp->nppods);
}
static int setup_conn_pgidx(struct t3cdev *tdev, unsigned int tid, int pg_idx,
int reply)
{
struct sk_buff *skb = alloc_skb(sizeof(struct cpl_set_tcb_field),
GFP_KERNEL);
struct cpl_set_tcb_field *req;
u64 val = pg_idx < DDP_PGIDX_MAX ? pg_idx : 0;
if (!skb)
return -ENOMEM;
/* set up ulp submode and page size */
req = (struct cpl_set_tcb_field *)skb_put(skb, sizeof(*req));
req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
req->wr.wr_lo = 0;
OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, tid));
req->reply = V_NO_REPLY(reply ? 0 : 1);
req->cpu_idx = 0;
req->word = htons(31);
req->mask = cpu_to_be64(0xF0000000);
req->val = cpu_to_be64(val << 28);
skb->priority = CPL_PRIORITY_CONTROL;
cxgb3_ofld_send(tdev, skb);
return 0;
}
/**
* cxgb3i_setup_conn_host_pagesize - setup the conn.'s ddp page size
* @tdev: t3cdev adapter
* @tid: connection id
* @reply: request reply from h/w
* set up the ddp page size based on the host PAGE_SIZE for a connection
* identified by tid
*/
int cxgb3i_setup_conn_host_pagesize(struct t3cdev *tdev, unsigned int tid,
int reply)
{
return setup_conn_pgidx(tdev, tid, page_idx, reply);
}
/**
* cxgb3i_setup_conn_pagesize - setup the conn.'s ddp page size
* @tdev: t3cdev adapter
* @tid: connection id
* @reply: request reply from h/w
* @pgsz: ddp page size
* set up the ddp page size for a connection identified by tid
*/
int cxgb3i_setup_conn_pagesize(struct t3cdev *tdev, unsigned int tid,
int reply, unsigned long pgsz)
{
int pgidx = cxgb3i_ddp_find_page_index(pgsz);
return setup_conn_pgidx(tdev, tid, pgidx, reply);
}
/**
* cxgb3i_setup_conn_digest - setup conn. digest setting
* @tdev: t3cdev adapter
* @tid: connection id
* @hcrc: header digest enabled
* @dcrc: data digest enabled
* @reply: request reply from h/w
* set up the iscsi digest settings for a connection identified by tid
*/
int cxgb3i_setup_conn_digest(struct t3cdev *tdev, unsigned int tid,
int hcrc, int dcrc, int reply)
{
struct sk_buff *skb = alloc_skb(sizeof(struct cpl_set_tcb_field),
GFP_KERNEL);
struct cpl_set_tcb_field *req;
u64 val = (hcrc ? 1 : 0) | (dcrc ? 2 : 0);
if (!skb)
return -ENOMEM;
/* set up ulp submode and page size */
req = (struct cpl_set_tcb_field *)skb_put(skb, sizeof(*req));
req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
req->wr.wr_lo = 0;
OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, tid));
req->reply = V_NO_REPLY(reply ? 0 : 1);
req->cpu_idx = 0;
req->word = htons(31);
req->mask = cpu_to_be64(0x0F000000);
req->val = cpu_to_be64(val << 24);
skb->priority = CPL_PRIORITY_CONTROL;
cxgb3_ofld_send(tdev, skb);
return 0;
}
/**
* cxgb3i_adapter_ddp_info - read the adapter's ddp information
* @tdev: t3cdev adapter
* @tformat: tag format
* @txsz: max tx pdu payload size, filled in by this func.
* @rxsz: max rx pdu payload size, filled in by this func.
* setup the tag format for a given iscsi entity
*/
int cxgb3i_adapter_ddp_info(struct t3cdev *tdev,
struct cxgb3i_tag_format *tformat,
unsigned int *txsz, unsigned int *rxsz)
{
struct cxgb3i_ddp_info *ddp;
unsigned char idx_bits;
if (!tformat)
return -EINVAL;
if (!tdev->ulp_iscsi)
return -EINVAL;
ddp = (struct cxgb3i_ddp_info *)tdev->ulp_iscsi;
idx_bits = 32 - tformat->sw_bits;
tformat->rsvd_bits = ddp->idx_bits;
tformat->rsvd_shift = PPOD_IDX_SHIFT;
tformat->rsvd_mask = (1 << tformat->rsvd_bits) - 1;
ddp_log_info("tag format: sw %u, rsvd %u,%u, mask 0x%x.\n",
tformat->sw_bits, tformat->rsvd_bits,
tformat->rsvd_shift, tformat->rsvd_mask);
*txsz = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
ddp->max_txsz - ISCSI_PDU_NONPAYLOAD_LEN);
*rxsz = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
ddp->max_rxsz - ISCSI_PDU_NONPAYLOAD_LEN);
ddp_log_info("max payload size: %u/%u, %u/%u.\n",
*txsz, ddp->max_txsz, *rxsz, ddp->max_rxsz);
return 0;
}
/**
* cxgb3i_ddp_cleanup - release the cxgb3 adapter's ddp resource
* @tdev: t3cdev adapter
* release all the resource held by the ddp pagepod manager for a given
* adapter if needed
*/
static void ddp_cleanup(struct kref *kref)
{
struct cxgb3i_ddp_info *ddp = container_of(kref,
struct cxgb3i_ddp_info,
refcnt);
int i = 0;
ddp_log_info("kref release ddp 0x%p, t3dev 0x%p.\n", ddp, ddp->tdev);
ddp->tdev->ulp_iscsi = NULL;
while (i < ddp->nppods) {
struct cxgb3i_gather_list *gl = ddp->gl_map[i];
if (gl) {
int npods = (gl->nelem + PPOD_PAGES_MAX - 1)
>> PPOD_PAGES_SHIFT;
ddp_log_info("t3dev 0x%p, ddp %d + %d.\n",
ddp->tdev, i, npods);
kfree(gl);
ddp_free_gl_skb(ddp, i, npods);
i += npods;
} else
i++;
}
cxgb3i_free_big_mem(ddp);
}
void cxgb3i_ddp_cleanup(struct t3cdev *tdev)
{
struct cxgb3i_ddp_info *ddp = (struct cxgb3i_ddp_info *)tdev->ulp_iscsi;
ddp_log_info("t3dev 0x%p, release ddp 0x%p.\n", tdev, ddp);
if (ddp)
kref_put(&ddp->refcnt, ddp_cleanup);
}
/**
* ddp_init - initialize the cxgb3 adapter's ddp resource
* @tdev: t3cdev adapter
* initialize the ddp pagepod manager for a given adapter
*/
static void ddp_init(struct t3cdev *tdev)
{
struct cxgb3i_ddp_info *ddp = tdev->ulp_iscsi;
struct ulp_iscsi_info uinfo;
unsigned int ppmax, bits;
int i, err;
if (ddp) {
kref_get(&ddp->refcnt);
ddp_log_warn("t3dev 0x%p, ddp 0x%p already set up.\n",
tdev, tdev->ulp_iscsi);
return;
}
err = tdev->ctl(tdev, ULP_ISCSI_GET_PARAMS, &uinfo);
if (err < 0) {
ddp_log_error("%s, failed to get iscsi param err=%d.\n",
tdev->name, err);
return;
}
ppmax = (uinfo.ulimit - uinfo.llimit + 1) >> PPOD_SIZE_SHIFT;
bits = __ilog2_u32(ppmax) + 1;
if (bits > PPOD_IDX_MAX_SIZE)
bits = PPOD_IDX_MAX_SIZE;
ppmax = (1 << (bits - 1)) - 1;
ddp = cxgb3i_alloc_big_mem(sizeof(struct cxgb3i_ddp_info) +
ppmax *
(sizeof(struct cxgb3i_gather_list *) +
sizeof(struct sk_buff *)),
GFP_KERNEL);
if (!ddp) {
ddp_log_warn("%s unable to alloc ddp 0x%d, ddp disabled.\n",
tdev->name, ppmax);
return;
}
ddp->gl_map = (struct cxgb3i_gather_list **)(ddp + 1);
ddp->gl_skb = (struct sk_buff **)(((char *)ddp->gl_map) +
ppmax *
sizeof(struct cxgb3i_gather_list *));
spin_lock_init(&ddp->map_lock);
kref_init(&ddp->refcnt);
ddp->tdev = tdev;
ddp->pdev = uinfo.pdev;
ddp->max_txsz = min_t(unsigned int, uinfo.max_txsz, ULP2_MAX_PKT_SIZE);
ddp->max_rxsz = min_t(unsigned int, uinfo.max_rxsz, ULP2_MAX_PKT_SIZE);
ddp->llimit = uinfo.llimit;
ddp->ulimit = uinfo.ulimit;
ddp->nppods = ppmax;
ddp->idx_last = ppmax;
ddp->idx_bits = bits;
ddp->idx_mask = (1 << bits) - 1;
ddp->rsvd_tag_mask = (1 << (bits + PPOD_IDX_SHIFT)) - 1;
uinfo.tagmask = ddp->idx_mask << PPOD_IDX_SHIFT;
for (i = 0; i < DDP_PGIDX_MAX; i++)
uinfo.pgsz_factor[i] = ddp_page_order[i];
uinfo.ulimit = uinfo.llimit + (ppmax << PPOD_SIZE_SHIFT);
err = tdev->ctl(tdev, ULP_ISCSI_SET_PARAMS, &uinfo);
if (err < 0) {
ddp_log_warn("%s unable to set iscsi param err=%d, "
"ddp disabled.\n", tdev->name, err);
goto free_ddp_map;
}
tdev->ulp_iscsi = ddp;
ddp_log_info("tdev 0x%p, nppods %u, bits %u, mask 0x%x,0x%x pkt %u/%u,"
" %u/%u.\n",
tdev, ppmax, ddp->idx_bits, ddp->idx_mask,
ddp->rsvd_tag_mask, ddp->max_txsz, uinfo.max_txsz,
ddp->max_rxsz, uinfo.max_rxsz);
return;
free_ddp_map:
cxgb3i_free_big_mem(ddp);
}
/**
* cxgb3i_ddp_init - initialize ddp functions
*/
void cxgb3i_ddp_init(struct t3cdev *tdev)
{
if (page_idx == DDP_PGIDX_MAX) {
page_idx = cxgb3i_ddp_find_page_index(PAGE_SIZE);
if (page_idx == DDP_PGIDX_MAX) {
ddp_log_info("system PAGE_SIZE %lu, update hw.\n",
PAGE_SIZE);
if (cxgb3i_ddp_adjust_page_table() < 0) {
ddp_log_info("PAGE_SIZE %lu, ddp disabled.\n",
PAGE_SIZE);
return;
}
page_idx = cxgb3i_ddp_find_page_index(PAGE_SIZE);
}
ddp_log_info("system PAGE_SIZE %lu, ddp idx %u.\n",
PAGE_SIZE, page_idx);
}
ddp_init(tdev);
}
drivers/scsi/cxgb3i/cxgb3i_ddp.h deleted 100644 → 0
View file @ 7b36b6e0
/*
* cxgb3i_ddp.h: Chelsio S3xx iSCSI DDP Manager.
*
* Copyright (c) 2008 Chelsio Communications, Inc.
*
* 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.
*
* Written by: Karen Xie (kxie@chelsio.com)
*/
#ifndef __CXGB3I_ULP2_DDP_H__
#define __CXGB3I_ULP2_DDP_H__
#include <linux/slab.h>
#include <linux/vmalloc.h>
/**
* struct cxgb3i_tag_format - cxgb3i ulp tag format for an iscsi entity
*
* @sw_bits: # of bits used by iscsi software layer
* @rsvd_bits: # of bits used by h/w
* @rsvd_shift: h/w bits shift left
* @rsvd_mask: reserved bit mask
*/
struct cxgb3i_tag_format {
unsigned char sw_bits;
unsigned char rsvd_bits;
unsigned char rsvd_shift;
unsigned char filler[1];
u32 rsvd_mask;
};
/**
* struct cxgb3i_gather_list - cxgb3i direct data placement memory
*
* @tag: ddp tag
* @length: total data buffer length
* @offset: initial offset to the 1st page
* @nelem: # of pages
* @pages: page pointers
* @phys_addr: physical address
*/
struct cxgb3i_gather_list {
u32 tag;
unsigned int length;
unsigned int offset;
unsigned int nelem;
struct page **pages;
dma_addr_t phys_addr[0];
};
/**
* struct cxgb3i_ddp_info - cxgb3i direct data placement for pdu payload
*
* @list: list head to link elements
* @refcnt: ref. count
* @tdev: pointer to t3cdev used by cxgb3 driver
* @max_txsz: max tx packet size for ddp
* @max_rxsz: max rx packet size for ddp
* @llimit: lower bound of the page pod memory
* @ulimit: upper bound of the page pod memory
* @nppods: # of page pod entries
* @idx_last: page pod entry last used
* @idx_bits: # of bits the pagepod index would take
* @idx_mask: pagepod index mask
* @rsvd_tag_mask: tag mask
* @map_lock: lock to synchonize access to the page pod map
* @gl_map: ddp memory gather list
* @gl_skb: skb used to program the pagepod
*/
struct cxgb3i_ddp_info {
struct list_head list;
struct kref refcnt;
struct t3cdev *tdev;
struct pci_dev *pdev;
unsigned int max_txsz;
unsigned int max_rxsz;
unsigned int llimit;
unsigned int ulimit;
unsigned int nppods;
unsigned int idx_last;
unsigned char idx_bits;
unsigned char filler[3];
u32 idx_mask;
u32 rsvd_tag_mask;
spinlock_t map_lock;
struct cxgb3i_gather_list **gl_map;
struct sk_buff **gl_skb;
};
#define ISCSI_PDU_NONPAYLOAD_LEN 312 /* bhs(48) + ahs(256) + digest(8) */
#define ULP2_MAX_PKT_SIZE 16224
#define ULP2_MAX_PDU_PAYLOAD (ULP2_MAX_PKT_SIZE - ISCSI_PDU_NONPAYLOAD_LEN)
#define PPOD_PAGES_MAX 4
#define PPOD_PAGES_SHIFT 2 /* 4 pages per pod */
/*
* struct pagepod_hdr, pagepod - pagepod format
*/
struct pagepod_hdr {
u32 vld_tid;
u32 pgsz_tag_clr;
u32 maxoffset;
u32 pgoffset;
u64 rsvd;
};
struct pagepod {
struct pagepod_hdr hdr;
u64 addr[PPOD_PAGES_MAX + 1];
};
#define PPOD_SIZE sizeof(struct pagepod) /* 64 */
#define PPOD_SIZE_SHIFT 6
#define PPOD_COLOR_SHIFT 0
#define PPOD_COLOR_SIZE 6
#define PPOD_COLOR_MASK ((1 << PPOD_COLOR_SIZE) - 1)
#define PPOD_IDX_SHIFT PPOD_COLOR_SIZE
#define PPOD_IDX_MAX_SIZE 24
#define S_PPOD_TID 0
#define M_PPOD_TID 0xFFFFFF
#define V_PPOD_TID(x) ((x) << S_PPOD_TID)
#define S_PPOD_VALID 24
#define V_PPOD_VALID(x) ((x) << S_PPOD_VALID)
#define F_PPOD_VALID V_PPOD_VALID(1U)
#define S_PPOD_COLOR 0
#define M_PPOD_COLOR 0x3F
#define V_PPOD_COLOR(x) ((x) << S_PPOD_COLOR)
#define S_PPOD_TAG 6
#define M_PPOD_TAG 0xFFFFFF
#define V_PPOD_TAG(x) ((x) << S_PPOD_TAG)
#define S_PPOD_PGSZ 30
#define M_PPOD_PGSZ 0x3
#define V_PPOD_PGSZ(x) ((x) << S_PPOD_PGSZ)
/*
* large memory chunk allocation/release
* use vmalloc() if kmalloc() fails
*/
static inline void *cxgb3i_alloc_big_mem(unsigned int size,
gfp_t gfp)
{
void *p = kmalloc(size, gfp);
if (!p)
p = vmalloc(size);
if (p)
memset(p, 0, size);
return p;
}
static inline void cxgb3i_free_big_mem(void *addr)
{
if (is_vmalloc_addr(addr))
vfree(addr);
else
kfree(addr);
}
/*
* cxgb3i ddp tag are 32 bits, it consists of reserved bits used by h/w and
* non-reserved bits that can be used by the iscsi s/w.
* The reserved bits are identified by the rsvd_bits and rsvd_shift fields
* in struct cxgb3i_tag_format.
*
* The upper most reserved bit can be used to check if a tag is ddp tag or not:
* if the bit is 0, the tag is a valid ddp tag
*/
/**
* cxgb3i_is_ddp_tag - check if a given tag is a hw/ddp tag
* @tformat: tag format information
* @tag: tag to be checked
*
* return true if the tag is a ddp tag, false otherwise.
*/
static inline int cxgb3i_is_ddp_tag(struct cxgb3i_tag_format *tformat, u32 tag)
{
return !(tag & (1 << (tformat->rsvd_bits + tformat->rsvd_shift - 1)));
}
/**
* cxgb3i_sw_tag_usable - check if s/w tag has enough bits left for hw bits
* @tformat: tag format information
* @sw_tag: s/w tag to be checked
*
* return true if the tag can be used for hw ddp tag, false otherwise.
*/
static inline int cxgb3i_sw_tag_usable(struct cxgb3i_tag_format *tformat,
u32 sw_tag)
{
sw_tag >>= (32 - tformat->rsvd_bits);
return !sw_tag;
}
/**
* cxgb3i_set_non_ddp_tag - mark a given s/w tag as an invalid ddp tag
* @tformat: tag format information
* @sw_tag: s/w tag to be checked
*
* insert 1 at the upper most reserved bit to mark it as an invalid ddp tag.
*/
static inline u32 cxgb3i_set_non_ddp_tag(struct cxgb3i_tag_format *tformat,
u32 sw_tag)
{
unsigned char shift = tformat->rsvd_bits + tformat->rsvd_shift - 1;
u32 mask = (1 << shift) - 1;
if (sw_tag && (sw_tag & ~mask)) {
u32 v1 = sw_tag & ((1 << shift) - 1);
u32 v2 = (sw_tag >> (shift - 1)) << shift;
return v2 | v1 | 1 << shift;
}
return sw_tag | 1 << shift;
}
/**
* cxgb3i_ddp_tag_base - shift s/w tag bits so that reserved bits are not used
* @tformat: tag format information
* @sw_tag: s/w tag to be checked
*/
static inline u32 cxgb3i_ddp_tag_base(struct cxgb3i_tag_format *tformat,
u32 sw_tag)
{
u32 mask = (1 << tformat->rsvd_shift) - 1;
if (sw_tag && (sw_tag & ~mask)) {
u32 v1 = sw_tag & mask;
u32 v2 = sw_tag >> tformat->rsvd_shift;
v2 <<= tformat->rsvd_shift + tformat->rsvd_bits;
return v2 | v1;
}
return sw_tag;
}
/**
* cxgb3i_tag_rsvd_bits - get the reserved bits used by the h/w
* @tformat: tag format information
* @tag: tag to be checked
*
* return the reserved bits in the tag
*/
static inline u32 cxgb3i_tag_rsvd_bits(struct cxgb3i_tag_format *tformat,
u32 tag)
{
if (cxgb3i_is_ddp_tag(tformat, tag))
return (tag >> tformat->rsvd_shift) & tformat->rsvd_mask;
return 0;
}
/**
* cxgb3i_tag_nonrsvd_bits - get the non-reserved bits used by the s/w
* @tformat: tag format information
* @tag: tag to be checked
*
* return the non-reserved bits in the tag.
*/
static inline u32 cxgb3i_tag_nonrsvd_bits(struct cxgb3i_tag_format *tformat,
u32 tag)
{
unsigned char shift = tformat->rsvd_bits + tformat->rsvd_shift - 1;
u32 v1, v2;
if (cxgb3i_is_ddp_tag(tformat, tag)) {
v1 = tag & ((1 << tformat->rsvd_shift) - 1);
v2 = (tag >> (shift + 1)) << tformat->rsvd_shift;
} else {
u32 mask = (1 << shift) - 1;
tag &= ~(1 << shift);
v1 = tag & mask;
v2 = (tag >> 1) & ~mask;
}
return v1 | v2;
}
int cxgb3i_ddp_tag_reserve(struct t3cdev *, unsigned int tid,
struct cxgb3i_tag_format *, u32 *tag,
struct cxgb3i_gather_list *, gfp_t gfp);
void cxgb3i_ddp_tag_release(struct t3cdev *, u32 tag);
struct cxgb3i_gather_list *cxgb3i_ddp_make_gl(unsigned int xferlen,
struct scatterlist *sgl,
unsigned int sgcnt,
struct pci_dev *pdev,
gfp_t gfp);
void cxgb3i_ddp_release_gl(struct cxgb3i_gather_list *gl,
struct pci_dev *pdev);
int cxgb3i_setup_conn_host_pagesize(struct t3cdev *, unsigned int tid,
int reply);
int cxgb3i_setup_conn_pagesize(struct t3cdev *, unsigned int tid, int reply,
unsigned long pgsz);
int cxgb3i_setup_conn_digest(struct t3cdev *, unsigned int tid,
int hcrc, int dcrc, int reply);
int cxgb3i_ddp_find_page_index(unsigned long pgsz);
int cxgb3i_adapter_ddp_info(struct t3cdev *, struct cxgb3i_tag_format *,
unsigned int *txsz, unsigned int *rxsz);
void cxgb3i_ddp_init(struct t3cdev *);
void cxgb3i_ddp_cleanup(struct t3cdev *);
#endif
drivers/scsi/cxgb3i/cxgb3i_init.c deleted 100644 → 0
View file @ 7b36b6e0
/* cxgb3i_init.c: Chelsio S3xx iSCSI driver.
*
* Copyright (c) 2008 Chelsio Communications, Inc.
*
* 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.
*
* Written by: Karen Xie (kxie@chelsio.com)
*/
#include "cxgb3i.h"
#define DRV_MODULE_NAME "cxgb3i"
#define DRV_MODULE_VERSION "1.0.2"
#define DRV_MODULE_RELDATE "Mar. 2009"
static char version[] =
"Chelsio S3xx iSCSI Driver " DRV_MODULE_NAME
" v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
MODULE_AUTHOR("Karen Xie <kxie@chelsio.com>");
MODULE_DESCRIPTION("Chelsio S3xx iSCSI Driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_MODULE_VERSION);
static void open_s3_dev(struct t3cdev *);
static void close_s3_dev(struct t3cdev *);
static void s3_event_handler(struct t3cdev *tdev, u32 event, u32 port);
static cxgb3_cpl_handler_func cxgb3i_cpl_handlers[NUM_CPL_CMDS];
static struct cxgb3_client t3c_client = {
.name = "iscsi_cxgb3",
.handlers = cxgb3i_cpl_handlers,
.add = open_s3_dev,
.remove = close_s3_dev,
.event_handler = s3_event_handler,
};
/**
* open_s3_dev - register with cxgb3 LLD
* @t3dev: cxgb3 adapter instance
*/
static void open_s3_dev(struct t3cdev *t3dev)
{
static int vers_printed;
if (!vers_printed) {
printk(KERN_INFO "%s", version);
vers_printed = 1;
}
cxgb3i_ddp_init(t3dev);
cxgb3i_sdev_add(t3dev, &t3c_client);
cxgb3i_adapter_open(t3dev);
}
/**
* close_s3_dev - de-register with cxgb3 LLD
* @t3dev: cxgb3 adapter instance
*/
static void close_s3_dev(struct t3cdev *t3dev)
{
cxgb3i_adapter_close(t3dev);
cxgb3i_sdev_remove(t3dev);
cxgb3i_ddp_cleanup(t3dev);
}
static void s3_event_handler(struct t3cdev *tdev, u32 event, u32 port)
{
struct cxgb3i_adapter *snic = cxgb3i_adapter_find_by_tdev(tdev);
cxgb3i_log_info("snic 0x%p, tdev 0x%p, event 0x%x, port 0x%x.\n",
snic, tdev, event, port);
if (!snic)
return;
switch (event) {
case OFFLOAD_STATUS_DOWN:
snic->flags |= CXGB3I_ADAPTER_FLAG_RESET;
break;
case OFFLOAD_STATUS_UP:
snic->flags &= ~CXGB3I_ADAPTER_FLAG_RESET;
break;
}
}
/**
* cxgb3i_init_module - module init entry point
*
* initialize any driver wide global data structures and register itself
* with the cxgb3 module
*/
static int __init cxgb3i_init_module(void)
{
int err;
err = cxgb3i_sdev_init(cxgb3i_cpl_handlers);
if (err < 0)
return err;
err = cxgb3i_iscsi_init();
if (err < 0)
return err;
err = cxgb3i_pdu_init();
if (err < 0) {
cxgb3i_iscsi_cleanup();
return err;
}
cxgb3_register_client(&t3c_client);
return 0;
}
/**
* cxgb3i_exit_module - module cleanup/exit entry point
*
* go through the driver hba list and for each hba, release any resource held.
* and unregisters iscsi transport and the cxgb3 module
*/
static void __exit cxgb3i_exit_module(void)
{
cxgb3_unregister_client(&t3c_client);
cxgb3i_pdu_cleanup();
cxgb3i_iscsi_cleanup();
cxgb3i_sdev_cleanup();
}
module_init(cxgb3i_init_module);
module_exit(cxgb3i_exit_module);
drivers/scsi/cxgb3i/cxgb3i_iscsi.c deleted 100644 → 0
View file @ 7b36b6e0
/* cxgb3i_iscsi.c: Chelsio S3xx iSCSI driver.
*
* Copyright (c) 2008 Chelsio Communications, Inc.
* Copyright (c) 2008 Mike Christie
* Copyright (c) 2008 Red Hat, Inc. All rights reserved.
*
* 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.
*
* Written by: Karen Xie (kxie@chelsio.com)
*/
#include <linux/inet.h>
#include <linux/slab.h>
#include <linux/crypto.h>
#include <linux/if_vlan.h>
#include <net/dst.h>
#include <net/tcp.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_eh.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi.h>
#include <scsi/iscsi_proto.h>
#include <scsi/libiscsi.h>
#include <scsi/scsi_transport_iscsi.h>
#include "cxgb3i.h"
#include "cxgb3i_pdu.h"
#ifdef __DEBUG_CXGB3I_TAG__
#define cxgb3i_tag_debug cxgb3i_log_debug
#else
#define cxgb3i_tag_debug(fmt...)
#endif
#ifdef __DEBUG_CXGB3I_API__
#define cxgb3i_api_debug cxgb3i_log_debug
#else
#define cxgb3i_api_debug(fmt...)
#endif
/*
* align pdu size to multiple of 512 for better performance
*/
#define align_pdu_size(n) do { n = (n) & (~511); } while (0)
static struct scsi_transport_template *cxgb3i_scsi_transport;
static struct scsi_host_template cxgb3i_host_template;
static struct iscsi_transport cxgb3i_iscsi_transport;
static unsigned char sw_tag_idx_bits;
static unsigned char sw_tag_age_bits;
static LIST_HEAD(cxgb3i_snic_list);
static DEFINE_RWLOCK(cxgb3i_snic_rwlock);
/**
* cxgb3i_adpater_find_by_tdev - find the cxgb3i_adapter structure via t3cdev
* @tdev: t3cdev pointer
*/
struct cxgb3i_adapter *cxgb3i_adapter_find_by_tdev(struct t3cdev *tdev)
{
struct cxgb3i_adapter *snic;
read_lock(&cxgb3i_snic_rwlock);
list_for_each_entry(snic, &cxgb3i_snic_list, list_head) {
if (snic->tdev == tdev) {
read_unlock(&cxgb3i_snic_rwlock);
return snic;
}
}
read_unlock(&cxgb3i_snic_rwlock);
return NULL;
}
static inline int adapter_update(struct cxgb3i_adapter *snic)
{
cxgb3i_log_info("snic 0x%p, t3dev 0x%p, updating.\n",
snic, snic->tdev);
return cxgb3i_adapter_ddp_info(snic->tdev, &snic->tag_format,
&snic->tx_max_size,
&snic->rx_max_size);
}
static int adapter_add(struct cxgb3i_adapter *snic)
{
struct t3cdev *t3dev = snic->tdev;
struct adapter *adapter = tdev2adap(t3dev);
int i, err;
snic->pdev = adapter->pdev;
snic->tag_format.sw_bits = sw_tag_idx_bits + sw_tag_age_bits;
err = cxgb3i_adapter_ddp_info(t3dev, &snic->tag_format,
&snic->tx_max_size,
&snic->rx_max_size);
if (err < 0)
return err;
for_each_port(adapter, i) {
snic->hba[i] = cxgb3i_hba_host_add(snic, adapter->port[i]);
if (!snic->hba[i])
return -EINVAL;
}
snic->hba_cnt = adapter->params.nports;
/* add to the list */
write_lock(&cxgb3i_snic_rwlock);
list_add_tail(&snic->list_head, &cxgb3i_snic_list);
write_unlock(&cxgb3i_snic_rwlock);
cxgb3i_log_info("t3dev 0x%p open, snic 0x%p, %u scsi hosts added.\n",
t3dev, snic, snic->hba_cnt);
return 0;
}
/**
* cxgb3i_adapter_open - init a s3 adapter structure and any h/w settings
* @t3dev: t3cdev adapter
*/
void cxgb3i_adapter_open(struct t3cdev *t3dev)
{
struct cxgb3i_adapter *snic = cxgb3i_adapter_find_by_tdev(t3dev);
int err;
if (snic)
err = adapter_update(snic);
else {
snic = kzalloc(sizeof(*snic), GFP_KERNEL);
if (snic) {
spin_lock_init(&snic->lock);
snic->tdev = t3dev;
err = adapter_add(snic);
} else
err = -ENOMEM;
}
if (err < 0) {
cxgb3i_log_info("snic 0x%p, f 0x%x, t3dev 0x%p open, err %d.\n",
snic, snic ? snic->flags : 0, t3dev, err);
if (snic) {
snic->flags &= ~CXGB3I_ADAPTER_FLAG_RESET;
cxgb3i_adapter_close(t3dev);
}
}
}
/**
* cxgb3i_adapter_close - release the resources held and cleanup h/w settings
* @t3dev: t3cdev adapter
*/
void cxgb3i_adapter_close(struct t3cdev *t3dev)
{
struct cxgb3i_adapter *snic = cxgb3i_adapter_find_by_tdev(t3dev);
int i;
if (!snic || snic->flags & CXGB3I_ADAPTER_FLAG_RESET) {
cxgb3i_log_info("t3dev 0x%p close, snic 0x%p, f 0x%x.\n",
t3dev, snic, snic ? snic->flags : 0);
return;
}
/* remove from the list */
write_lock(&cxgb3i_snic_rwlock);
list_del(&snic->list_head);
write_unlock(&cxgb3i_snic_rwlock);
for (i = 0; i < snic->hba_cnt; i++) {
if (snic->hba[i]) {
cxgb3i_hba_host_remove(snic->hba[i]);
snic->hba[i] = NULL;
}
}
cxgb3i_log_info("t3dev 0x%p close, snic 0x%p, %u scsi hosts removed.\n",
t3dev, snic, snic->hba_cnt);
kfree(snic);
}
/**
* cxgb3i_hba_find_by_netdev - find the cxgb3i_hba structure via net_device
* @t3dev: t3cdev adapter
*/
static struct cxgb3i_hba *cxgb3i_hba_find_by_netdev(struct net_device *ndev)
{
struct cxgb3i_adapter *snic;
int i;
if (ndev->priv_flags & IFF_802_1Q_VLAN)
ndev = vlan_dev_real_dev(ndev);
read_lock(&cxgb3i_snic_rwlock);
list_for_each_entry(snic, &cxgb3i_snic_list, list_head) {
for (i = 0; i < snic->hba_cnt; i++) {
if (snic->hba[i]->ndev == ndev) {
read_unlock(&cxgb3i_snic_rwlock);
return snic->hba[i];
}
}
}
read_unlock(&cxgb3i_snic_rwlock);
return NULL;
}
/**
* cxgb3i_hba_host_add - register a new host with scsi/iscsi
* @snic: the cxgb3i adapter
* @ndev: associated net_device
*/
struct cxgb3i_hba *cxgb3i_hba_host_add(struct cxgb3i_adapter *snic,
struct net_device *ndev)
{
struct cxgb3i_hba *hba;
struct Scsi_Host *shost;
int err;
shost = iscsi_host_alloc(&cxgb3i_host_template,
sizeof(struct cxgb3i_hba), 1);
if (!shost) {
cxgb3i_log_info("snic 0x%p, ndev 0x%p, host_alloc failed.\n",
snic, ndev);
return NULL;
}
shost->transportt = cxgb3i_scsi_transport;
shost->max_lun = CXGB3I_MAX_LUN;
shost->max_id = CXGB3I_MAX_TARGET;
shost->max_channel = 0;
shost->max_cmd_len = 16;
hba = iscsi_host_priv(shost);
hba->snic = snic;
hba->ndev = ndev;
hba->shost = shost;
pci_dev_get(snic->pdev);
err = iscsi_host_add(shost, &snic->pdev->dev);
if (err) {
cxgb3i_log_info("snic 0x%p, ndev 0x%p, host_add failed.\n",
snic, ndev);
goto pci_dev_put;
}
cxgb3i_api_debug("shost 0x%p, hba 0x%p, no %u.\n",
shost, hba, shost->host_no);
return hba;
pci_dev_put:
pci_dev_put(snic->pdev);
scsi_host_put(shost);
return NULL;
}
/**
* cxgb3i_hba_host_remove - de-register the host with scsi/iscsi
* @hba: the cxgb3i hba
*/
void cxgb3i_hba_host_remove(struct cxgb3i_hba *hba)
{
cxgb3i_api_debug("shost 0x%p, hba 0x%p, no %u.\n",
hba->shost, hba, hba->shost->host_no);
iscsi_host_remove(hba->shost);
pci_dev_put(hba->snic->pdev);
iscsi_host_free(hba->shost);
}
/**
* cxgb3i_ep_connect - establish TCP connection to target portal
* @shost: scsi host to use
* @dst_addr: target IP address
* @non_blocking: blocking or non-blocking call
*
* Initiates a TCP/IP connection to the dst_addr
*/
static struct iscsi_endpoint *cxgb3i_ep_connect(struct Scsi_Host *shost,
struct sockaddr *dst_addr,
int non_blocking)
{
struct iscsi_endpoint *ep;
struct cxgb3i_endpoint *cep;
struct cxgb3i_hba *hba = NULL;
struct s3_conn *c3cn = NULL;
int err = 0;
if (shost)
hba = iscsi_host_priv(shost);
cxgb3i_api_debug("shost 0x%p, hba 0x%p.\n", shost, hba);
c3cn = cxgb3i_c3cn_create();
if (!c3cn) {
cxgb3i_log_info("ep connect OOM.\n");
err = -ENOMEM;
goto release_conn;
}
err = cxgb3i_c3cn_connect(hba ? hba->ndev : NULL, c3cn,
(struct sockaddr_in *)dst_addr);
if (err < 0) {
cxgb3i_log_info("ep connect failed.\n");
goto release_conn;
}
hba = cxgb3i_hba_find_by_netdev(c3cn->dst_cache->dev);
if (!hba) {
err = -ENOSPC;
cxgb3i_log_info("NOT going through cxgbi device.\n");
goto release_conn;
}
if (shost && hba != iscsi_host_priv(shost)) {
err = -ENOSPC;
cxgb3i_log_info("Could not connect through request host%u\n",
shost->host_no);
goto release_conn;
}
if (c3cn_is_closing(c3cn)) {
err = -ENOSPC;
cxgb3i_log_info("ep connect unable to connect.\n");
goto release_conn;
}
ep = iscsi_create_endpoint(sizeof(*cep));
if (!ep) {
err = -ENOMEM;
cxgb3i_log_info("iscsi alloc ep, OOM.\n");
goto release_conn;
}
cep = ep->dd_data;
cep->c3cn = c3cn;
cep->hba = hba;
cxgb3i_api_debug("ep 0x%p, 0x%p, c3cn 0x%p, hba 0x%p.\n",
ep, cep, c3cn, hba);
return ep;
release_conn:
cxgb3i_api_debug("conn 0x%p failed, release.\n", c3cn);
if (c3cn)
cxgb3i_c3cn_release(c3cn);
return ERR_PTR(err);
}
/**
* cxgb3i_ep_poll - polls for TCP connection establishement
* @ep: TCP connection (endpoint) handle
* @timeout_ms: timeout value in milli secs
*
* polls for TCP connect request to complete
*/
static int cxgb3i_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
{
struct cxgb3i_endpoint *cep = ep->dd_data;
struct s3_conn *c3cn = cep->c3cn;
if (!c3cn_is_established(c3cn))
return 0;
cxgb3i_api_debug("ep 0x%p, c3cn 0x%p established.\n", ep, c3cn);
return 1;
}
/**
* cxgb3i_ep_disconnect - teardown TCP connection
* @ep: TCP connection (endpoint) handle
*
* teardown TCP connection
*/
static void cxgb3i_ep_disconnect(struct iscsi_endpoint *ep)
{
struct cxgb3i_endpoint *cep = ep->dd_data;
struct cxgb3i_conn *cconn = cep->cconn;
cxgb3i_api_debug("ep 0x%p, cep 0x%p.\n", ep, cep);
if (cconn && cconn->conn) {
/*
* stop the xmit path so the xmit_pdu function is
* not being called
*/
iscsi_suspend_tx(cconn->conn);
write_lock_bh(&cep->c3cn->callback_lock);
cep->c3cn->user_data = NULL;
cconn->cep = NULL;
write_unlock_bh(&cep->c3cn->callback_lock);
}
cxgb3i_api_debug("ep 0x%p, cep 0x%p, release c3cn 0x%p.\n",
ep, cep, cep->c3cn);
cxgb3i_c3cn_release(cep->c3cn);
iscsi_destroy_endpoint(ep);
}
/**
* cxgb3i_session_create - create a new iscsi session
* @cmds_max: max # of commands
* @qdepth: scsi queue depth
* @initial_cmdsn: initial iscsi CMDSN for this session
*
* Creates a new iSCSI session
*/
static struct iscsi_cls_session *
cxgb3i_session_create(struct iscsi_endpoint *ep, u16 cmds_max, u16 qdepth,
u32 initial_cmdsn)
{
struct cxgb3i_endpoint *cep;
struct cxgb3i_hba *hba;
struct Scsi_Host *shost;
struct iscsi_cls_session *cls_session;
struct iscsi_session *session;
if (!ep) {
cxgb3i_log_error("%s, missing endpoint.\n", __func__);
return NULL;
}
cep = ep->dd_data;
hba = cep->hba;
shost = hba->shost;
cxgb3i_api_debug("ep 0x%p, cep 0x%p, hba 0x%p.\n", ep, cep, hba);
BUG_ON(hba != iscsi_host_priv(shost));
cls_session = iscsi_session_setup(&cxgb3i_iscsi_transport, shost,
cmds_max, 0,
sizeof(struct iscsi_tcp_task) +
sizeof(struct cxgb3i_task_data),
initial_cmdsn, ISCSI_MAX_TARGET);
if (!cls_session)
return NULL;
session = cls_session->dd_data;
if (iscsi_tcp_r2tpool_alloc(session))
goto remove_session;
return cls_session;
remove_session:
iscsi_session_teardown(cls_session);
return NULL;
}
/**
* cxgb3i_session_destroy - destroys iscsi session
* @cls_session: pointer to iscsi cls session
*
* Destroys an iSCSI session instance and releases its all resources held
*/
static void cxgb3i_session_destroy(struct iscsi_cls_session *cls_session)
{
cxgb3i_api_debug("sess 0x%p.\n", cls_session);
iscsi_tcp_r2tpool_free(cls_session->dd_data);
iscsi_session_teardown(cls_session);
}
/**
* cxgb3i_conn_max_xmit_dlength -- calc the max. xmit pdu segment size
* @conn: iscsi connection
* check the max. xmit pdu payload, reduce it if needed
*/
static inline int cxgb3i_conn_max_xmit_dlength(struct iscsi_conn *conn)
{
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
struct cxgb3i_conn *cconn = tcp_conn->dd_data;
unsigned int max = max(512 * MAX_SKB_FRAGS, SKB_TX_HEADROOM);
max = min(cconn->hba->snic->tx_max_size, max);
if (conn->max_xmit_dlength)
conn->max_xmit_dlength = min(conn->max_xmit_dlength, max);
else
conn->max_xmit_dlength = max;
align_pdu_size(conn->max_xmit_dlength);
cxgb3i_api_debug("conn 0x%p, max xmit %u.\n",
conn, conn->max_xmit_dlength);
return 0;
}
/**
* cxgb3i_conn_max_recv_dlength -- check the max. recv pdu segment size
* @conn: iscsi connection
* return 0 if the value is valid, < 0 otherwise.
*/
static inline int cxgb3i_conn_max_recv_dlength(struct iscsi_conn *conn)
{
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
struct cxgb3i_conn *cconn = tcp_conn->dd_data;
unsigned int max = cconn->hba->snic->rx_max_size;
align_pdu_size(max);
if (conn->max_recv_dlength) {
if (conn->max_recv_dlength > max) {
cxgb3i_log_error("MaxRecvDataSegmentLength %u too big."
" Need to be <= %u.\n",
conn->max_recv_dlength, max);
return -EINVAL;
}
conn->max_recv_dlength = min(conn->max_recv_dlength, max);
align_pdu_size(conn->max_recv_dlength);
} else
conn->max_recv_dlength = max;
cxgb3i_api_debug("conn 0x%p, max recv %u.\n",
conn, conn->max_recv_dlength);
return 0;
}
/**
* cxgb3i_conn_create - create iscsi connection instance
* @cls_session: pointer to iscsi cls session
* @cid: iscsi cid
*
* Creates a new iSCSI connection instance for a given session
*/
static struct iscsi_cls_conn *cxgb3i_conn_create(struct iscsi_cls_session
*cls_session, u32 cid)
{
struct iscsi_cls_conn *cls_conn;
struct iscsi_conn *conn;
struct iscsi_tcp_conn *tcp_conn;
struct cxgb3i_conn *cconn;
cxgb3i_api_debug("sess 0x%p, cid %u.\n", cls_session, cid);
cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid);
if (!cls_conn)
return NULL;
conn = cls_conn->dd_data;
tcp_conn = conn->dd_data;
cconn = tcp_conn->dd_data;
cconn->conn = conn;
return cls_conn;
}
/**
* cxgb3i_conn_bind - binds iscsi sess, conn and endpoint together
* @cls_session: pointer to iscsi cls session
* @cls_conn: pointer to iscsi cls conn
* @transport_eph: 64-bit EP handle
* @is_leading: leading connection on this session?
*
* Binds together an iSCSI session, an iSCSI connection and a
* TCP connection. This routine returns error code if the TCP
* connection does not belong on the device iSCSI sess/conn is bound
*/
static int cxgb3i_conn_bind(struct iscsi_cls_session *cls_session,
struct iscsi_cls_conn *cls_conn,
u64 transport_eph, int is_leading)
{
struct iscsi_conn *conn = cls_conn->dd_data;
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
struct cxgb3i_conn *cconn = tcp_conn->dd_data;
struct cxgb3i_adapter *snic;
struct iscsi_endpoint *ep;
struct cxgb3i_endpoint *cep;
struct s3_conn *c3cn;
int err;
ep = iscsi_lookup_endpoint(transport_eph);
if (!ep)
return -EINVAL;
/* setup ddp pagesize */
cep = ep->dd_data;
c3cn = cep->c3cn;
snic = cep->hba->snic;
err = cxgb3i_setup_conn_host_pagesize(snic->tdev, c3cn->tid, 0);
if (err < 0)
return err;
cxgb3i_api_debug("ep 0x%p, cls sess 0x%p, cls conn 0x%p.\n",
ep, cls_session, cls_conn);
err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
if (err)
return -EINVAL;
/* calculate the tag idx bits needed for this conn based on cmds_max */
cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1;
cxgb3i_api_debug("session cmds_max 0x%x, bits %u.\n",
conn->session->cmds_max, cconn->task_idx_bits);
read_lock(&c3cn->callback_lock);
c3cn->user_data = conn;
cconn->hba = cep->hba;
cconn->cep = cep;
cep->cconn = cconn;
read_unlock(&c3cn->callback_lock);
cxgb3i_conn_max_xmit_dlength(conn);
cxgb3i_conn_max_recv_dlength(conn);
spin_lock_bh(&conn->session->lock);
sprintf(conn->portal_address, "%pI4", &c3cn->daddr.sin_addr.s_addr);
conn->portal_port = ntohs(c3cn->daddr.sin_port);
spin_unlock_bh(&conn->session->lock);
/* init recv engine */
iscsi_tcp_hdr_recv_prep(tcp_conn);
return 0;
}
/**
* cxgb3i_conn_get_param - return iscsi connection parameter to caller
* @cls_conn: pointer to iscsi cls conn
* @param: parameter type identifier
* @buf: buffer pointer
*
* returns iSCSI connection parameters
*/
static int cxgb3i_conn_get_param(struct iscsi_cls_conn *cls_conn,
enum iscsi_param param, char *buf)
{
struct iscsi_conn *conn = cls_conn->dd_data;
int len;
cxgb3i_api_debug("cls_conn 0x%p, param %d.\n", cls_conn, param);
switch (param) {
case ISCSI_PARAM_CONN_PORT:
spin_lock_bh(&conn->session->lock);
len = sprintf(buf, "%hu\n", conn->portal_port);
spin_unlock_bh(&conn->session->lock);
break;
case ISCSI_PARAM_CONN_ADDRESS:
spin_lock_bh(&conn->session->lock);
len = sprintf(buf, "%s\n", conn->portal_address);
spin_unlock_bh(&conn->session->lock);
break;
default:
return iscsi_conn_get_param(cls_conn, param, buf);
}
return len;
}
/**
* cxgb3i_conn_set_param - set iscsi connection parameter
* @cls_conn: pointer to iscsi cls conn
* @param: parameter type identifier
* @buf: buffer pointer
* @buflen: buffer length
*
* set iSCSI connection parameters
*/
static int cxgb3i_conn_set_param(struct iscsi_cls_conn *cls_conn,
enum iscsi_param param, char *buf, int buflen)
{
struct iscsi_conn *conn = cls_conn->dd_data;
struct iscsi_session *session = conn->session;
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
struct cxgb3i_conn *cconn = tcp_conn->dd_data;
struct cxgb3i_adapter *snic = cconn->hba->snic;
struct s3_conn *c3cn = cconn->cep->c3cn;
int value, err = 0;
switch (param) {
case ISCSI_PARAM_HDRDGST_EN:
err = iscsi_set_param(cls_conn, param, buf, buflen);
if (!err && conn->hdrdgst_en)
err = cxgb3i_setup_conn_digest(snic->tdev, c3cn->tid,
conn->hdrdgst_en,
conn->datadgst_en, 0);
break;
case ISCSI_PARAM_DATADGST_EN:
err = iscsi_set_param(cls_conn, param, buf, buflen);
if (!err && conn->datadgst_en)
err = cxgb3i_setup_conn_digest(snic->tdev, c3cn->tid,
conn->hdrdgst_en,
conn->datadgst_en, 0);
break;
case ISCSI_PARAM_MAX_R2T:
sscanf(buf, "%d", &value);
if (value <= 0 || !is_power_of_2(value))
return -EINVAL;
if (session->max_r2t == value)
break;
iscsi_tcp_r2tpool_free(session);
err = iscsi_set_param(cls_conn, param, buf, buflen);
if (!err && iscsi_tcp_r2tpool_alloc(session))
return -ENOMEM;
case ISCSI_PARAM_MAX_RECV_DLENGTH:
err = iscsi_set_param(cls_conn, param, buf, buflen);
if (!err)
err = cxgb3i_conn_max_recv_dlength(conn);
break;
case ISCSI_PARAM_MAX_XMIT_DLENGTH:
err = iscsi_set_param(cls_conn, param, buf, buflen);
if (!err)
err = cxgb3i_conn_max_xmit_dlength(conn);
break;
default:
return iscsi_set_param(cls_conn, param, buf, buflen);
}
return err;
}
/**
* cxgb3i_host_set_param - configure host (adapter) related parameters
* @shost: scsi host pointer
* @param: parameter type identifier
* @buf: buffer pointer
*/
static int cxgb3i_host_set_param(struct Scsi_Host *shost,
enum iscsi_host_param param,
char *buf, int buflen)
{
struct cxgb3i_hba *hba = iscsi_host_priv(shost);
if (!hba->ndev) {
shost_printk(KERN_ERR, shost, "Could not set host param. "
"Netdev for host not set.\n");
return -ENODEV;
}
cxgb3i_api_debug("param %d, buf %s.\n", param, buf);
switch (param) {
case ISCSI_HOST_PARAM_IPADDRESS:
{
__be32 addr = in_aton(buf);
cxgb3i_set_private_ipv4addr(hba->ndev, addr);
return 0;
}
case ISCSI_HOST_PARAM_HWADDRESS:
case ISCSI_HOST_PARAM_NETDEV_NAME:
/* ignore */
return 0;
default:
return iscsi_host_set_param(shost, param, buf, buflen);
}
}
/**
* cxgb3i_host_get_param - returns host (adapter) related parameters
* @shost: scsi host pointer
* @param: parameter type identifier
* @buf: buffer pointer
*/
static int cxgb3i_host_get_param(struct Scsi_Host *shost,
enum iscsi_host_param param, char *buf)
{
struct cxgb3i_hba *hba = iscsi_host_priv(shost);
int len = 0;
if (!hba->ndev) {
shost_printk(KERN_ERR, shost, "Could not set host param. "
"Netdev for host not set.\n");
return -ENODEV;
}
cxgb3i_api_debug("hba %s, param %d.\n", hba->ndev->name, param);
switch (param) {
case ISCSI_HOST_PARAM_HWADDRESS:
len = sysfs_format_mac(buf, hba->ndev->dev_addr, 6);
break;
case ISCSI_HOST_PARAM_NETDEV_NAME:
len = sprintf(buf, "%s\n", hba->ndev->name);
break;
case ISCSI_HOST_PARAM_IPADDRESS:
{
__be32 addr;
addr = cxgb3i_get_private_ipv4addr(hba->ndev);
len = sprintf(buf, "%pI4", &addr);
break;
}
default:
return iscsi_host_get_param(shost, param, buf);
}
return len;
}
/**
* cxgb3i_conn_get_stats - returns iSCSI stats
* @cls_conn: pointer to iscsi cls conn
* @stats: pointer to iscsi statistic struct
*/
static void cxgb3i_conn_get_stats(struct iscsi_cls_conn *cls_conn,
struct iscsi_stats *stats)
{
struct iscsi_conn *conn = cls_conn->dd_data;
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->digest_err = 0;
stats->timeout_err = 0;
stats->custom_length = 1;
strcpy(stats->custom[0].desc, "eh_abort_cnt");
stats->custom[0].value = conn->eh_abort_cnt;
}
/**
* cxgb3i_parse_itt - get the idx and age bits from a given tag
* @conn: iscsi connection
* @itt: itt tag
* @idx: task index, filled in by this function
* @age: session age, filled in by this function
*/
static void cxgb3i_parse_itt(struct iscsi_conn *conn, itt_t itt,
int *idx, int *age)
{
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
struct cxgb3i_conn *cconn = tcp_conn->dd_data;
struct cxgb3i_adapter *snic = cconn->hba->snic;
u32 tag = ntohl((__force u32) itt);
u32 sw_bits;
sw_bits = cxgb3i_tag_nonrsvd_bits(&snic->tag_format, tag);
if (idx)
*idx = sw_bits & ((1 << cconn->task_idx_bits) - 1);
if (age)
*age = (sw_bits >> cconn->task_idx_bits) & ISCSI_AGE_MASK;
cxgb3i_tag_debug("parse tag 0x%x/0x%x, sw 0x%x, itt 0x%x, age 0x%x.\n",
tag, itt, sw_bits, idx ? *idx : 0xFFFFF,
age ? *age : 0xFF);
}
/**
* cxgb3i_reserve_itt - generate tag for a give task
* @task: iscsi task
* @hdr_itt: tag, filled in by this function
* Set up ddp for scsi read tasks if possible.
*/
int cxgb3i_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt)
{
struct scsi_cmnd *sc = task->sc;
struct iscsi_conn *conn = task->conn;
struct iscsi_session *sess = conn->session;
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
struct cxgb3i_conn *cconn = tcp_conn->dd_data;
struct cxgb3i_adapter *snic = cconn->hba->snic;
struct cxgb3i_tag_format *tformat = &snic->tag_format;
u32 sw_tag = (sess->age << cconn->task_idx_bits) | task->itt;
u32 tag;
int err = -EINVAL;
if (sc &&
(scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
cxgb3i_sw_tag_usable(tformat, sw_tag)) {
struct s3_conn *c3cn = cconn->cep->c3cn;
struct cxgb3i_gather_list *gl;
gl = cxgb3i_ddp_make_gl(scsi_in(sc)->length,
scsi_in(sc)->table.sgl,
scsi_in(sc)->table.nents,
snic->pdev,
GFP_ATOMIC);
if (gl) {
tag = sw_tag;
err = cxgb3i_ddp_tag_reserve(snic->tdev, c3cn->tid,
tformat, &tag,
gl, GFP_ATOMIC);
if (err < 0)
cxgb3i_ddp_release_gl(gl, snic->pdev);
}
}
if (err < 0)
tag = cxgb3i_set_non_ddp_tag(tformat, sw_tag);
/* the itt need to sent in big-endian order */
*hdr_itt = (__force itt_t)htonl(tag);
cxgb3i_tag_debug("new tag 0x%x/0x%x (itt 0x%x, age 0x%x).\n",
tag, *hdr_itt, task->itt, sess->age);
return 0;
}
/**
* cxgb3i_release_itt - release the tag for a given task
* @task: iscsi task
* @hdr_itt: tag
* If the tag is a ddp tag, release the ddp setup
*/
void cxgb3i_release_itt(struct iscsi_task *task, itt_t hdr_itt)
{
struct scsi_cmnd *sc = task->sc;
struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
struct cxgb3i_conn *cconn = tcp_conn->dd_data;
struct cxgb3i_adapter *snic = cconn->hba->snic;
struct cxgb3i_tag_format *tformat = &snic->tag_format;
u32 tag = ntohl((__force u32)hdr_itt);
cxgb3i_tag_debug("release tag 0x%x.\n", tag);
if (sc &&
(scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
cxgb3i_is_ddp_tag(tformat, tag))
cxgb3i_ddp_tag_release(snic->tdev, tag);
}
/**
* cxgb3i_host_template -- Scsi_Host_Template structure
* used when registering with the scsi mid layer
*/
static struct scsi_host_template cxgb3i_host_template = {
.module = THIS_MODULE,
.name = "Chelsio S3xx iSCSI Initiator",
.proc_name = "cxgb3i",
.queuecommand = iscsi_queuecommand,
.change_queue_depth = iscsi_change_queue_depth,
.can_queue = CXGB3I_SCSI_HOST_QDEPTH,
.sg_tablesize = SG_ALL,
.max_sectors = 0xFFFF,
.cmd_per_lun = ISCSI_DEF_CMD_PER_LUN,
.eh_abort_handler = iscsi_eh_abort,
.eh_device_reset_handler = iscsi_eh_device_reset,
.eh_target_reset_handler = iscsi_eh_recover_target,
.target_alloc = iscsi_target_alloc,
.use_clustering = DISABLE_CLUSTERING,
.this_id = -1,
};
static struct iscsi_transport cxgb3i_iscsi_transport = {
.owner = THIS_MODULE,
.name = "cxgb3i",
.caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST
| CAP_DATADGST | CAP_DIGEST_OFFLOAD |
CAP_PADDING_OFFLOAD,
.param_mask = ISCSI_MAX_RECV_DLENGTH |
ISCSI_MAX_XMIT_DLENGTH |
ISCSI_HDRDGST_EN |
ISCSI_DATADGST_EN |
ISCSI_INITIAL_R2T_EN |
ISCSI_MAX_R2T |
ISCSI_IMM_DATA_EN |
ISCSI_FIRST_BURST |
ISCSI_MAX_BURST |
ISCSI_PDU_INORDER_EN |
ISCSI_DATASEQ_INORDER_EN |
ISCSI_ERL |
ISCSI_CONN_PORT |
ISCSI_CONN_ADDRESS |
ISCSI_EXP_STATSN |
ISCSI_PERSISTENT_PORT |
ISCSI_PERSISTENT_ADDRESS |
ISCSI_TARGET_NAME | ISCSI_TPGT |
ISCSI_USERNAME | ISCSI_PASSWORD |
ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN |
ISCSI_FAST_ABORT | ISCSI_ABORT_TMO |
ISCSI_LU_RESET_TMO | ISCSI_TGT_RESET_TMO |
ISCSI_PING_TMO | ISCSI_RECV_TMO |
ISCSI_IFACE_NAME | ISCSI_INITIATOR_NAME,
.host_param_mask = ISCSI_HOST_HWADDRESS | ISCSI_HOST_IPADDRESS |
ISCSI_HOST_INITIATOR_NAME | ISCSI_HOST_NETDEV_NAME,
.get_host_param = cxgb3i_host_get_param,
.set_host_param = cxgb3i_host_set_param,
/* session management */
.create_session = cxgb3i_session_create,
.destroy_session = cxgb3i_session_destroy,
.get_session_param = iscsi_session_get_param,
/* connection management */
.create_conn = cxgb3i_conn_create,
.bind_conn = cxgb3i_conn_bind,
.destroy_conn = iscsi_tcp_conn_teardown,
.start_conn = iscsi_conn_start,
.stop_conn = iscsi_conn_stop,
.get_conn_param = cxgb3i_conn_get_param,
.set_param = cxgb3i_conn_set_param,
.get_stats = cxgb3i_conn_get_stats,
/* pdu xmit req. from user space */
.send_pdu = iscsi_conn_send_pdu,
/* task */
.init_task = iscsi_tcp_task_init,
.xmit_task = iscsi_tcp_task_xmit,
.cleanup_task = cxgb3i_conn_cleanup_task,
/* pdu */
.alloc_pdu = cxgb3i_conn_alloc_pdu,
.init_pdu = cxgb3i_conn_init_pdu,
.xmit_pdu = cxgb3i_conn_xmit_pdu,
.parse_pdu_itt = cxgb3i_parse_itt,
/* TCP connect/disconnect */
.ep_connect = cxgb3i_ep_connect,
.ep_poll = cxgb3i_ep_poll,
.ep_disconnect = cxgb3i_ep_disconnect,
/* Error recovery timeout call */
.session_recovery_timedout = iscsi_session_recovery_timedout,
};
int cxgb3i_iscsi_init(void)
{
sw_tag_idx_bits = (__ilog2_u32(ISCSI_ITT_MASK)) + 1;
sw_tag_age_bits = (__ilog2_u32(ISCSI_AGE_MASK)) + 1;
cxgb3i_log_info("tag itt 0x%x, %u bits, age 0x%x, %u bits.\n",
ISCSI_ITT_MASK, sw_tag_idx_bits,
ISCSI_AGE_MASK, sw_tag_age_bits);
cxgb3i_scsi_transport =
iscsi_register_transport(&cxgb3i_iscsi_transport);
if (!cxgb3i_scsi_transport) {
cxgb3i_log_error("Could not register cxgb3i transport.\n");
return -ENODEV;
}
cxgb3i_api_debug("cxgb3i transport 0x%p.\n", cxgb3i_scsi_transport);
return 0;
}
void cxgb3i_iscsi_cleanup(void)
{
if (cxgb3i_scsi_transport) {
cxgb3i_api_debug("cxgb3i transport 0x%p.\n",
cxgb3i_scsi_transport);
iscsi_unregister_transport(&cxgb3i_iscsi_transport);
}
}
drivers/scsi/cxgb3i/cxgb3i_offload.c deleted 100644 → 0
View file @ 7b36b6e0
/*
* cxgb3i_offload.c: Chelsio S3xx iscsi offloaded tcp connection management
*
* Copyright (C) 2003-2008 Chelsio Communications. All rights reserved.
*
* 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 LICENSE file included in this
* release for licensing terms and conditions.
*
* Written by: Dimitris Michailidis (dm@chelsio.com)
* Karen Xie (kxie@chelsio.com)
*/
#include <linux/if_vlan.h>
#include <linux/slab.h>
#include <linux/version.h>
#include "cxgb3_defs.h"
#include "cxgb3_ctl_defs.h"
#include "firmware_exports.h"
#include "cxgb3i_offload.h"
#include "cxgb3i_pdu.h"
#include "cxgb3i_ddp.h"
#ifdef __DEBUG_C3CN_CONN__
#define c3cn_conn_debug cxgb3i_log_debug
#else
#define c3cn_conn_debug(fmt...)
#endif
#ifdef __DEBUG_C3CN_TX__
#define c3cn_tx_debug cxgb3i_log_debug
#else
#define c3cn_tx_debug(fmt...)
#endif
#ifdef __DEBUG_C3CN_RX__
#define c3cn_rx_debug cxgb3i_log_debug
#else
#define c3cn_rx_debug(fmt...)
#endif
/*
* module parameters releated to offloaded iscsi connection
*/
static int cxgb3_rcv_win = 256 * 1024;
module_param(cxgb3_rcv_win, int, 0644);
MODULE_PARM_DESC(cxgb3_rcv_win, "TCP receive window in bytes (default=256KB)");
static int cxgb3_snd_win = 128 * 1024;
module_param(cxgb3_snd_win, int, 0644);
MODULE_PARM_DESC(cxgb3_snd_win, "TCP send window in bytes (default=128KB)");
static int cxgb3_rx_credit_thres = 10 * 1024;
module_param(cxgb3_rx_credit_thres, int, 0644);
MODULE_PARM_DESC(rx_credit_thres,
"RX credits return threshold in bytes (default=10KB)");
static unsigned int cxgb3_max_connect = 8 * 1024;
module_param(cxgb3_max_connect, uint, 0644);
MODULE_PARM_DESC(cxgb3_max_connect, "Max. # of connections (default=8092)");
static unsigned int cxgb3_sport_base = 20000;
module_param(cxgb3_sport_base, uint, 0644);
MODULE_PARM_DESC(cxgb3_sport_base, "starting port number (default=20000)");
/*
* cxgb3i tcp connection data(per adapter) list
*/
static LIST_HEAD(cdata_list);
static DEFINE_RWLOCK(cdata_rwlock);
static int c3cn_push_tx_frames(struct s3_conn *c3cn, int req_completion);
static void c3cn_release_offload_resources(struct s3_conn *c3cn);
/*
* iscsi source port management
*
* Find a free source port in the port allocation map. We use a very simple
* rotor scheme to look for the next free port.
*
* If a source port has been specified make sure that it doesn't collide with
* our normal source port allocation map. If it's outside the range of our
* allocation/deallocation scheme just let them use it.
*
* If the source port is outside our allocation range, the caller is
* responsible for keeping track of their port usage.
*/
static int c3cn_get_port(struct s3_conn *c3cn, struct cxgb3i_sdev_data *cdata)
{
unsigned int start;
int idx;
if (!cdata)
goto error_out;
if (c3cn->saddr.sin_port) {
cxgb3i_log_error("connect, sin_port NON-ZERO %u.\n",
c3cn->saddr.sin_port);
return -EADDRINUSE;
}
spin_lock_bh(&cdata->lock);
start = idx = cdata->sport_next;
do {
if (++idx >= cxgb3_max_connect)
idx = 0;
if (!cdata->sport_conn[idx]) {
c3cn->saddr.sin_port = htons(cxgb3_sport_base + idx);
cdata->sport_next = idx;
cdata->sport_conn[idx] = c3cn;
spin_unlock_bh(&cdata->lock);
c3cn_conn_debug("%s reserve port %u.\n",
cdata->cdev->name,
cxgb3_sport_base + idx);
return 0;
}
} while (idx != start);
spin_unlock_bh(&cdata->lock);
error_out:
return -EADDRNOTAVAIL;
}
static void c3cn_put_port(struct s3_conn *c3cn)
{
if (!c3cn->cdev)
return;
if (c3cn->saddr.sin_port) {
struct cxgb3i_sdev_data *cdata = CXGB3_SDEV_DATA(c3cn->cdev);
int idx = ntohs(c3cn->saddr.sin_port) - cxgb3_sport_base;
c3cn->saddr.sin_port = 0;
if (idx < 0 || idx >= cxgb3_max_connect)
return;
spin_lock_bh(&cdata->lock);
cdata->sport_conn[idx] = NULL;
spin_unlock_bh(&cdata->lock);
c3cn_conn_debug("%s, release port %u.\n",
cdata->cdev->name, cxgb3_sport_base + idx);
}
}
static inline void c3cn_set_flag(struct s3_conn *c3cn, enum c3cn_flags flag)
{
__set_bit(flag, &c3cn->flags);
c3cn_conn_debug("c3cn 0x%p, set %d, s %u, f 0x%lx.\n",
c3cn, flag, c3cn->state, c3cn->flags);
}
static inline void c3cn_clear_flag(struct s3_conn *c3cn, enum c3cn_flags flag)
{
__clear_bit(flag, &c3cn->flags);
c3cn_conn_debug("c3cn 0x%p, clear %d, s %u, f 0x%lx.\n",
c3cn, flag, c3cn->state, c3cn->flags);
}
static inline int c3cn_flag(struct s3_conn *c3cn, enum c3cn_flags flag)
{
if (c3cn == NULL)
return 0;
return test_bit(flag, &c3cn->flags);
}
static void c3cn_set_state(struct s3_conn *c3cn, int state)
{
c3cn_conn_debug("c3cn 0x%p state -> %u.\n", c3cn, state);
c3cn->state = state;
}
static inline void c3cn_hold(struct s3_conn *c3cn)
{
atomic_inc(&c3cn->refcnt);
}
static inline void c3cn_put(struct s3_conn *c3cn)
{
if (atomic_dec_and_test(&c3cn->refcnt)) {
c3cn_conn_debug("free c3cn 0x%p, s %u, f 0x%lx.\n",
c3cn, c3cn->state, c3cn->flags);
kfree(c3cn);
}
}
static void c3cn_closed(struct s3_conn *c3cn)
{
c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n",
c3cn, c3cn->state, c3cn->flags);
c3cn_put_port(c3cn);
c3cn_release_offload_resources(c3cn);
c3cn_set_state(c3cn, C3CN_STATE_CLOSED);
cxgb3i_conn_closing(c3cn);
}
/*
* CPL (Chelsio Protocol Language) defines a message passing interface between
* the host driver and T3 asic.
* The section below implments CPLs that related to iscsi tcp connection
* open/close/abort and data send/receive.
*/
/*
* CPL connection active open request: host ->
*/
static unsigned int find_best_mtu(const struct t3c_data *d, unsigned short mtu)
{
int i = 0;
while (i < d->nmtus - 1 && d->mtus[i + 1] <= mtu)
++i;
return i;
}
static unsigned int select_mss(struct s3_conn *c3cn, unsigned int pmtu)
{
unsigned int idx;
struct dst_entry *dst = c3cn->dst_cache;
struct t3cdev *cdev = c3cn->cdev;
const struct t3c_data *td = T3C_DATA(cdev);
u16 advmss = dst_metric(dst, RTAX_ADVMSS);
if (advmss > pmtu - 40)
advmss = pmtu - 40;
if (advmss < td->mtus[0] - 40)
advmss = td->mtus[0] - 40;
idx = find_best_mtu(td, advmss + 40);
return idx;
}
static inline int compute_wscale(int win)
{
int wscale = 0;
while (wscale < 14 && (65535<<wscale) < win)
wscale++;
return wscale;
}
static inline unsigned int calc_opt0h(struct s3_conn *c3cn)
{
int wscale = compute_wscale(cxgb3_rcv_win);
return V_KEEP_ALIVE(1) |
F_TCAM_BYPASS |
V_WND_SCALE(wscale) |
V_MSS_IDX(c3cn->mss_idx);
}
static inline unsigned int calc_opt0l(struct s3_conn *c3cn)
{
return V_ULP_MODE(ULP_MODE_ISCSI) |
V_RCV_BUFSIZ(cxgb3_rcv_win>>10);
}
static void make_act_open_req(struct s3_conn *c3cn, struct sk_buff *skb,
unsigned int atid, const struct l2t_entry *e)
{
struct cpl_act_open_req *req;
c3cn_conn_debug("c3cn 0x%p, atid 0x%x.\n", c3cn, atid);
skb->priority = CPL_PRIORITY_SETUP;
req = (struct cpl_act_open_req *)__skb_put(skb, sizeof(*req));
req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
req->wr.wr_lo = 0;
OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_ACT_OPEN_REQ, atid));
req->local_port = c3cn->saddr.sin_port;
req->peer_port = c3cn->daddr.sin_port;
req->local_ip = c3cn->saddr.sin_addr.s_addr;
req->peer_ip = c3cn->daddr.sin_addr.s_addr;
req->opt0h = htonl(calc_opt0h(c3cn) | V_L2T_IDX(e->idx) |
V_TX_CHANNEL(e->smt_idx));
req->opt0l = htonl(calc_opt0l(c3cn));
req->params = 0;
req->opt2 = 0;
}
static void fail_act_open(struct s3_conn *c3cn, int errno)
{
c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n",
c3cn, c3cn->state, c3cn->flags);
c3cn->err = errno;
c3cn_closed(c3cn);
}
static void act_open_req_arp_failure(struct t3cdev *dev, struct sk_buff *skb)
{
struct s3_conn *c3cn = (struct s3_conn *)skb->sk;
c3cn_conn_debug("c3cn 0x%p, state %u.\n", c3cn, c3cn->state);
c3cn_hold(c3cn);
spin_lock_bh(&c3cn->lock);
if (c3cn->state == C3CN_STATE_CONNECTING)
fail_act_open(c3cn, -EHOSTUNREACH);
spin_unlock_bh(&c3cn->lock);
c3cn_put(c3cn);
__kfree_skb(skb);
}
/*
* CPL connection close request: host ->
*
* Close a connection by sending a CPL_CLOSE_CON_REQ message and queue it to
* the write queue (i.e., after any unsent txt data).
*/
static void skb_entail(struct s3_conn *c3cn, struct sk_buff *skb,
int flags)
{
skb_tcp_seq(skb) = c3cn->write_seq;
skb_flags(skb) = flags;
__skb_queue_tail(&c3cn->write_queue, skb);
}
static void send_close_req(struct s3_conn *c3cn)
{
struct sk_buff *skb = c3cn->cpl_close;
struct cpl_close_con_req *req = (struct cpl_close_con_req *)skb->head;
unsigned int tid = c3cn->tid;
c3cn_conn_debug("c3cn 0x%p, state 0x%x, flag 0x%lx.\n",
c3cn, c3cn->state, c3cn->flags);
c3cn->cpl_close = NULL;
req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_CLOSE_CON));
req->wr.wr_lo = htonl(V_WR_TID(tid));
OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_CLOSE_CON_REQ, tid));
req->rsvd = htonl(c3cn->write_seq);
skb_entail(c3cn, skb, C3CB_FLAG_NO_APPEND);
if (c3cn->state != C3CN_STATE_CONNECTING)
c3cn_push_tx_frames(c3cn, 1);
}
/*
* CPL connection abort request: host ->
*
* Send an ABORT_REQ message. Makes sure we do not send multiple ABORT_REQs
* for the same connection and also that we do not try to send a message
* after the connection has closed.
*/
static void abort_arp_failure(struct t3cdev *cdev, struct sk_buff *skb)
{
struct cpl_abort_req *req = cplhdr(skb);
c3cn_conn_debug("tdev 0x%p.\n", cdev);
req->cmd = CPL_ABORT_NO_RST;
cxgb3_ofld_send(cdev, skb);
}
static inline void c3cn_purge_write_queue(struct s3_conn *c3cn)
{
struct sk_buff *skb;
while ((skb = __skb_dequeue(&c3cn->write_queue)))
__kfree_skb(skb);
}
static void send_abort_req(struct s3_conn *c3cn)
{
struct sk_buff *skb = c3cn->cpl_abort_req;
struct cpl_abort_req *req;
unsigned int tid = c3cn->tid;
if (unlikely(c3cn->state == C3CN_STATE_ABORTING) || !skb ||
!c3cn->cdev)
return;
c3cn_set_state(c3cn, C3CN_STATE_ABORTING);
c3cn_conn_debug("c3cn 0x%p, flag ABORT_RPL + ABORT_SHUT.\n", c3cn);
c3cn_set_flag(c3cn, C3CN_ABORT_RPL_PENDING);
/* Purge the send queue so we don't send anything after an abort. */
c3cn_purge_write_queue(c3cn);
c3cn->cpl_abort_req = NULL;
req = (struct cpl_abort_req *)skb->head;
memset(req, 0, sizeof(*req));
skb->priority = CPL_PRIORITY_DATA;
set_arp_failure_handler(skb, abort_arp_failure);
req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_HOST_ABORT_CON_REQ));
req->wr.wr_lo = htonl(V_WR_TID(tid));
OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_ABORT_REQ, tid));
req->rsvd0 = htonl(c3cn->snd_nxt);
req->rsvd1 = !c3cn_flag(c3cn, C3CN_TX_DATA_SENT);
req->cmd = CPL_ABORT_SEND_RST;
l2t_send(c3cn->cdev, skb, c3cn->l2t);
}
/*
* CPL connection abort reply: host ->
*
* Send an ABORT_RPL message in response of the ABORT_REQ received.
*/
static void send_abort_rpl(struct s3_conn *c3cn, int rst_status)
{
struct sk_buff *skb = c3cn->cpl_abort_rpl;
struct cpl_abort_rpl *rpl = (struct cpl_abort_rpl *)skb->head;
c3cn->cpl_abort_rpl = NULL;
skb->priority = CPL_PRIORITY_DATA;
memset(rpl, 0, sizeof(*rpl));
rpl->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_HOST_ABORT_CON_RPL));
rpl->wr.wr_lo = htonl(V_WR_TID(c3cn->tid));
OPCODE_TID(rpl) = htonl(MK_OPCODE_TID(CPL_ABORT_RPL, c3cn->tid));
rpl->cmd = rst_status;
cxgb3_ofld_send(c3cn->cdev, skb);
}
/*
* CPL connection rx data ack: host ->
* Send RX credits through an RX_DATA_ACK CPL message. Returns the number of
* credits sent.
*/
static u32 send_rx_credits(struct s3_conn *c3cn, u32 credits, u32 dack)
{
struct sk_buff *skb;
struct cpl_rx_data_ack *req;
skb = alloc_skb(sizeof(*req), GFP_ATOMIC);
if (!skb)
return 0;
req = (struct cpl_rx_data_ack *)__skb_put(skb, sizeof(*req));
req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
req->wr.wr_lo = 0;
OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_RX_DATA_ACK, c3cn->tid));
req->credit_dack = htonl(dack | V_RX_CREDITS(credits));
skb->priority = CPL_PRIORITY_ACK;
cxgb3_ofld_send(c3cn->cdev, skb);
return credits;
}
/*
* CPL connection tx data: host ->
*
* Send iscsi PDU via TX_DATA CPL message. Returns the number of
* credits sent.
* Each TX_DATA consumes work request credit (wrs), so we need to keep track of
* how many we've used so far and how many are pending (i.e., yet ack'ed by T3).
*/
/*
* For ULP connections HW may inserts digest bytes into the pdu. Those digest
* bytes are not sent by the host but are part of the TCP payload and therefore
* consume TCP sequence space.
*/
static const unsigned int cxgb3_ulp_extra_len[] = { 0, 4, 4, 8 };
static inline unsigned int ulp_extra_len(const struct sk_buff *skb)
{
return cxgb3_ulp_extra_len[skb_ulp_mode(skb) & 3];
}
static unsigned int wrlen __read_mostly;
/*
* The number of WRs needed for an skb depends on the number of fragments
* in the skb and whether it has any payload in its main body. This maps the
* length of the gather list represented by an skb into the # of necessary WRs.
* The extra two fragments are for iscsi bhs and payload padding.
*/
#define SKB_WR_LIST_SIZE (MAX_SKB_FRAGS + 2)
static unsigned int skb_wrs[SKB_WR_LIST_SIZE] __read_mostly;
static void s3_init_wr_tab(unsigned int wr_len)
{
int i;
if (skb_wrs[1]) /* already initialized */
return;
for (i = 1; i < SKB_WR_LIST_SIZE; i++) {
int sgl_len = (3 * i) / 2 + (i & 1);
sgl_len += 3;
skb_wrs[i] = (sgl_len <= wr_len
? 1 : 1 + (sgl_len - 2) / (wr_len - 1));
}
wrlen = wr_len * 8;
}
static inline void reset_wr_list(struct s3_conn *c3cn)
{
c3cn->wr_pending_head = c3cn->wr_pending_tail = NULL;
}
/*
* Add a WR to a connections's list of pending WRs. This is a singly-linked
* list of sk_buffs operating as a FIFO. The head is kept in wr_pending_head
* and the tail in wr_pending_tail.
*/
static inline void enqueue_wr(struct s3_conn *c3cn,
struct sk_buff *skb)
{
skb_tx_wr_next(skb) = NULL;
/*
* We want to take an extra reference since both us and the driver
* need to free the packet before it's really freed. We know there's
* just one user currently so we use atomic_set rather than skb_get
* to avoid the atomic op.
*/
atomic_set(&skb->users, 2);
if (!c3cn->wr_pending_head)
c3cn->wr_pending_head = skb;
else
skb_tx_wr_next(c3cn->wr_pending_tail) = skb;
c3cn->wr_pending_tail = skb;
}
static int count_pending_wrs(struct s3_conn *c3cn)
{
int n = 0;
const struct sk_buff *skb = c3cn->wr_pending_head;
while (skb) {
n += skb->csum;
skb = skb_tx_wr_next(skb);
}
return n;
}
static inline struct sk_buff *peek_wr(const struct s3_conn *c3cn)
{
return c3cn->wr_pending_head;
}
static inline void free_wr_skb(struct sk_buff *skb)
{
kfree_skb(skb);
}
static inline struct sk_buff *dequeue_wr(struct s3_conn *c3cn)
{
struct sk_buff *skb = c3cn->wr_pending_head;
if (likely(skb)) {
/* Don't bother clearing the tail */
c3cn->wr_pending_head = skb_tx_wr_next(skb);
skb_tx_wr_next(skb) = NULL;
}
return skb;
}
static void purge_wr_queue(struct s3_conn *c3cn)
{
struct sk_buff *skb;
while ((skb = dequeue_wr(c3cn)) != NULL)
free_wr_skb(skb);
}
static inline void make_tx_data_wr(struct s3_conn *c3cn, struct sk_buff *skb,
int len, int req_completion)
{
struct tx_data_wr *req;
skb_reset_transport_header(skb);
req = (struct tx_data_wr *)__skb_push(skb, sizeof(*req));
req->wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_TX_DATA) |
(req_completion ? F_WR_COMPL : 0));
req->wr_lo = htonl(V_WR_TID(c3cn->tid));
req->sndseq = htonl(c3cn->snd_nxt);
/* len includes the length of any HW ULP additions */
req->len = htonl(len);
req->param = htonl(V_TX_PORT(c3cn->l2t->smt_idx));
/* V_TX_ULP_SUBMODE sets both the mode and submode */
req->flags = htonl(V_TX_ULP_SUBMODE(skb_ulp_mode(skb)) |
V_TX_SHOVE((skb_peek(&c3cn->write_queue) ? 0 : 1)));
if (!c3cn_flag(c3cn, C3CN_TX_DATA_SENT)) {
req->flags |= htonl(V_TX_ACK_PAGES(2) | F_TX_INIT |
V_TX_CPU_IDX(c3cn->qset));
/* Sendbuffer is in units of 32KB. */
req->param |= htonl(V_TX_SNDBUF(cxgb3_snd_win >> 15));
c3cn_set_flag(c3cn, C3CN_TX_DATA_SENT);
}
}
/**
* c3cn_push_tx_frames -- start transmit
* @c3cn: the offloaded connection
* @req_completion: request wr_ack or not
*
* Prepends TX_DATA_WR or CPL_CLOSE_CON_REQ headers to buffers waiting in a
* connection's send queue and sends them on to T3. Must be called with the
* connection's lock held. Returns the amount of send buffer space that was
* freed as a result of sending queued data to T3.
*/
static void arp_failure_discard(struct t3cdev *cdev, struct sk_buff *skb)
{
kfree_skb(skb);
}
static int c3cn_push_tx_frames(struct s3_conn *c3cn, int req_completion)
{
int total_size = 0;
struct sk_buff *skb;
struct t3cdev *cdev;
struct cxgb3i_sdev_data *cdata;
if (unlikely(c3cn->state == C3CN_STATE_CONNECTING ||
c3cn->state == C3CN_STATE_CLOSE_WAIT_1 ||
c3cn->state >= C3CN_STATE_ABORTING)) {
c3cn_tx_debug("c3cn 0x%p, in closing state %u.\n",
c3cn, c3cn->state);
return 0;
}
cdev = c3cn->cdev;
cdata = CXGB3_SDEV_DATA(cdev);
while (c3cn->wr_avail
&& (skb = skb_peek(&c3cn->write_queue)) != NULL) {
int len = skb->len; /* length before skb_push */
int frags = skb_shinfo(skb)->nr_frags + (len != skb->data_len);
int wrs_needed = skb_wrs[frags];
if (wrs_needed > 1 && len + sizeof(struct tx_data_wr) <= wrlen)
wrs_needed = 1;
WARN_ON(frags >= SKB_WR_LIST_SIZE || wrs_needed < 1);
if (c3cn->wr_avail < wrs_needed) {
c3cn_tx_debug("c3cn 0x%p, skb len %u/%u, frag %u, "
"wr %d < %u.\n",
c3cn, skb->len, skb->data_len, frags,
wrs_needed, c3cn->wr_avail);
break;
}
__skb_unlink(skb, &c3cn->write_queue);
skb->priority = CPL_PRIORITY_DATA;
skb->csum = wrs_needed; /* remember this until the WR_ACK */
c3cn->wr_avail -= wrs_needed;
c3cn->wr_unacked += wrs_needed;
enqueue_wr(c3cn, skb);
c3cn_tx_debug("c3cn 0x%p, enqueue, skb len %u/%u, frag %u, "
"wr %d, left %u, unack %u.\n",
c3cn, skb->len, skb->data_len, frags,
wrs_needed, c3cn->wr_avail, c3cn->wr_unacked);
if (likely(skb_flags(skb) & C3CB_FLAG_NEED_HDR)) {
if ((req_completion &&
c3cn->wr_unacked == wrs_needed) ||
(skb_flags(skb) & C3CB_FLAG_COMPL) ||
c3cn->wr_unacked >= c3cn->wr_max / 2) {
req_completion = 1;
c3cn->wr_unacked = 0;
}
len += ulp_extra_len(skb);
make_tx_data_wr(c3cn, skb, len, req_completion);
c3cn->snd_nxt += len;
skb_flags(skb) &= ~C3CB_FLAG_NEED_HDR;
}
total_size += skb->truesize;
set_arp_failure_handler(skb, arp_failure_discard);
l2t_send(cdev, skb, c3cn->l2t);
}
return total_size;
}
/*
* process_cpl_msg: -> host
* Top-level CPL message processing used by most CPL messages that
* pertain to connections.
*/
static inline void process_cpl_msg(void (*fn)(struct s3_conn *,
struct sk_buff *),
struct s3_conn *c3cn,
struct sk_buff *skb)
{
spin_lock_bh(&c3cn->lock);
fn(c3cn, skb);
spin_unlock_bh(&c3cn->lock);
}
/*
* process_cpl_msg_ref: -> host
* Similar to process_cpl_msg() but takes an extra connection reference around
* the call to the handler. Should be used if the handler may drop a
* connection reference.
*/
static inline void process_cpl_msg_ref(void (*fn) (struct s3_conn *,
struct sk_buff *),
struct s3_conn *c3cn,
struct sk_buff *skb)
{
c3cn_hold(c3cn);
process_cpl_msg(fn, c3cn, skb);
c3cn_put(c3cn);
}
/*
* Process a CPL_ACT_ESTABLISH message: -> host
* Updates connection state from an active establish CPL message. Runs with
* the connection lock held.
*/
static inline void s3_free_atid(struct t3cdev *cdev, unsigned int tid)
{
struct s3_conn *c3cn = cxgb3_free_atid(cdev, tid);
if (c3cn)
c3cn_put(c3cn);
}
static void c3cn_established(struct s3_conn *c3cn, u32 snd_isn,
unsigned int opt)
{
c3cn_conn_debug("c3cn 0x%p, state %u.\n", c3cn, c3cn->state);
c3cn->write_seq = c3cn->snd_nxt = c3cn->snd_una = snd_isn;
/*
* Causes the first RX_DATA_ACK to supply any Rx credits we couldn't
* pass through opt0.
*/
if (cxgb3_rcv_win > (M_RCV_BUFSIZ << 10))
c3cn->rcv_wup -= cxgb3_rcv_win - (M_RCV_BUFSIZ << 10);
dst_confirm(c3cn->dst_cache);
smp_mb();
c3cn_set_state(c3cn, C3CN_STATE_ESTABLISHED);
}
static void process_act_establish(struct s3_conn *c3cn, struct sk_buff *skb)
{
struct cpl_act_establish *req = cplhdr(skb);
u32 rcv_isn = ntohl(req->rcv_isn); /* real RCV_ISN + 1 */
c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n",
c3cn, c3cn->state, c3cn->flags);
if (unlikely(c3cn->state != C3CN_STATE_CONNECTING))
cxgb3i_log_error("TID %u expected SYN_SENT, got EST., s %u\n",
c3cn->tid, c3cn->state);
c3cn->copied_seq = c3cn->rcv_wup = c3cn->rcv_nxt = rcv_isn;
c3cn_established(c3cn, ntohl(req->snd_isn), ntohs(req->tcp_opt));
__kfree_skb(skb);
if (unlikely(c3cn_flag(c3cn, C3CN_ACTIVE_CLOSE_NEEDED)))
/* upper layer has requested closing */
send_abort_req(c3cn);
else {
if (skb_queue_len(&c3cn->write_queue))
c3cn_push_tx_frames(c3cn, 1);
cxgb3i_conn_tx_open(c3cn);
}
}
static int do_act_establish(struct t3cdev *cdev, struct sk_buff *skb,
void *ctx)
{
struct cpl_act_establish *req = cplhdr(skb);
unsigned int tid = GET_TID(req);
unsigned int atid = G_PASS_OPEN_TID(ntohl(req->tos_tid));
struct s3_conn *c3cn = ctx;
struct cxgb3i_sdev_data *cdata = CXGB3_SDEV_DATA(cdev);
c3cn_conn_debug("rcv, tid 0x%x, c3cn 0x%p, s %u, f 0x%lx.\n",
tid, c3cn, c3cn->state, c3cn->flags);
c3cn->tid = tid;
c3cn_hold(c3cn);
cxgb3_insert_tid(cdata->cdev, cdata->client, c3cn, tid);
s3_free_atid(cdev, atid);
c3cn->qset = G_QNUM(ntohl(skb->csum));
process_cpl_msg(process_act_establish, c3cn, skb);
return 0;
}
/*
* Process a CPL_ACT_OPEN_RPL message: -> host
* Handle active open failures.
*/
static int act_open_rpl_status_to_errno(int status)
{
switch (status) {
case CPL_ERR_CONN_RESET:
return -ECONNREFUSED;
case CPL_ERR_ARP_MISS:
return -EHOSTUNREACH;
case CPL_ERR_CONN_TIMEDOUT:
return -ETIMEDOUT;
case CPL_ERR_TCAM_FULL:
return -ENOMEM;
case CPL_ERR_CONN_EXIST:
cxgb3i_log_error("ACTIVE_OPEN_RPL: 4-tuple in use\n");
return -EADDRINUSE;
default:
return -EIO;
}
}
static void act_open_retry_timer(unsigned long data)
{
struct sk_buff *skb;
struct s3_conn *c3cn = (struct s3_conn *)data;
c3cn_conn_debug("c3cn 0x%p, state %u.\n", c3cn, c3cn->state);
spin_lock_bh(&c3cn->lock);
skb = alloc_skb(sizeof(struct cpl_act_open_req), GFP_ATOMIC);
if (!skb)
fail_act_open(c3cn, -ENOMEM);
else {
skb->sk = (struct sock *)c3cn;
set_arp_failure_handler(skb, act_open_req_arp_failure);
make_act_open_req(c3cn, skb, c3cn->tid, c3cn->l2t);
l2t_send(c3cn->cdev, skb, c3cn->l2t);
}
spin_unlock_bh(&c3cn->lock);
c3cn_put(c3cn);
}
static void process_act_open_rpl(struct s3_conn *c3cn, struct sk_buff *skb)
{
struct cpl_act_open_rpl *rpl = cplhdr(skb);
c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n",
c3cn, c3cn->state, c3cn->flags);
if (rpl->status == CPL_ERR_CONN_EXIST &&
c3cn->retry_timer.function != act_open_retry_timer) {
c3cn->retry_timer.function = act_open_retry_timer;
if (!mod_timer(&c3cn->retry_timer, jiffies + HZ / 2))
c3cn_hold(c3cn);
} else
fail_act_open(c3cn, act_open_rpl_status_to_errno(rpl->status));
__kfree_skb(skb);
}
static int do_act_open_rpl(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
{
struct s3_conn *c3cn = ctx;
struct cpl_act_open_rpl *rpl = cplhdr(skb);
c3cn_conn_debug("rcv, status 0x%x, c3cn 0x%p, s %u, f 0x%lx.\n",
rpl->status, c3cn, c3cn->state, c3cn->flags);
if (rpl->status != CPL_ERR_TCAM_FULL &&
rpl->status != CPL_ERR_CONN_EXIST &&
rpl->status != CPL_ERR_ARP_MISS)
cxgb3_queue_tid_release(cdev, GET_TID(rpl));
process_cpl_msg_ref(process_act_open_rpl, c3cn, skb);
return 0;
}
/*
* Process PEER_CLOSE CPL messages: -> host
* Handle peer FIN.
*/
static void process_peer_close(struct s3_conn *c3cn, struct sk_buff *skb)
{
c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n",
c3cn, c3cn->state, c3cn->flags);
if (c3cn_flag(c3cn, C3CN_ABORT_RPL_PENDING))
goto out;
switch (c3cn->state) {
case C3CN_STATE_ESTABLISHED:
c3cn_set_state(c3cn, C3CN_STATE_PASSIVE_CLOSE);
break;
case C3CN_STATE_ACTIVE_CLOSE:
c3cn_set_state(c3cn, C3CN_STATE_CLOSE_WAIT_2);
break;
case C3CN_STATE_CLOSE_WAIT_1:
c3cn_closed(c3cn);
break;
case C3CN_STATE_ABORTING:
break;
default:
cxgb3i_log_error("%s: peer close, TID %u in bad state %u\n",
c3cn->cdev->name, c3cn->tid, c3cn->state);
}
cxgb3i_conn_closing(c3cn);
out:
__kfree_skb(skb);
}
static int do_peer_close(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
{
struct s3_conn *c3cn = ctx;
c3cn_conn_debug("rcv, c3cn 0x%p, s %u, f 0x%lx.\n",
c3cn, c3cn->state, c3cn->flags);
process_cpl_msg_ref(process_peer_close, c3cn, skb);
return 0;
}
/*
* Process CLOSE_CONN_RPL CPL message: -> host
* Process a peer ACK to our FIN.
*/
static void process_close_con_rpl(struct s3_conn *c3cn, struct sk_buff *skb)
{
struct cpl_close_con_rpl *rpl = cplhdr(skb);
c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n",
c3cn, c3cn->state, c3cn->flags);
c3cn->snd_una = ntohl(rpl->snd_nxt) - 1; /* exclude FIN */
if (c3cn_flag(c3cn, C3CN_ABORT_RPL_PENDING))
goto out;
switch (c3cn->state) {
case C3CN_STATE_ACTIVE_CLOSE:
c3cn_set_state(c3cn, C3CN_STATE_CLOSE_WAIT_1);
break;
case C3CN_STATE_CLOSE_WAIT_1:
case C3CN_STATE_CLOSE_WAIT_2:
c3cn_closed(c3cn);
break;
case C3CN_STATE_ABORTING:
break;
default:
cxgb3i_log_error("%s: close_rpl, TID %u in bad state %u\n",
c3cn->cdev->name, c3cn->tid, c3cn->state);
}
out:
kfree_skb(skb);
}
static int do_close_con_rpl(struct t3cdev *cdev, struct sk_buff *skb,
void *ctx)
{
struct s3_conn *c3cn = ctx;
c3cn_conn_debug("rcv, c3cn 0x%p, s %u, f 0x%lx.\n",
c3cn, c3cn->state, c3cn->flags);
process_cpl_msg_ref(process_close_con_rpl, c3cn, skb);
return 0;
}
/*
* Process ABORT_REQ_RSS CPL message: -> host
* Process abort requests. If we are waiting for an ABORT_RPL we ignore this
* request except that we need to reply to it.
*/
static int abort_status_to_errno(struct s3_conn *c3cn, int abort_reason,
int *need_rst)
{
switch (abort_reason) {
case CPL_ERR_BAD_SYN: /* fall through */
case CPL_ERR_CONN_RESET:
return c3cn->state > C3CN_STATE_ESTABLISHED ?
-EPIPE : -ECONNRESET;
case CPL_ERR_XMIT_TIMEDOUT:
case CPL_ERR_PERSIST_TIMEDOUT:
case CPL_ERR_FINWAIT2_TIMEDOUT:
case CPL_ERR_KEEPALIVE_TIMEDOUT:
return -ETIMEDOUT;
default:
return -EIO;
}
}
static void process_abort_req(struct s3_conn *c3cn, struct sk_buff *skb)
{
int rst_status = CPL_ABORT_NO_RST;
const struct cpl_abort_req_rss *req = cplhdr(skb);
c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n",
c3cn, c3cn->state, c3cn->flags);
if (!c3cn_flag(c3cn, C3CN_ABORT_REQ_RCVD)) {
c3cn_set_flag(c3cn, C3CN_ABORT_REQ_RCVD);
c3cn_set_state(c3cn, C3CN_STATE_ABORTING);
__kfree_skb(skb);
return;
}
c3cn_clear_flag(c3cn, C3CN_ABORT_REQ_RCVD);
send_abort_rpl(c3cn, rst_status);
if (!c3cn_flag(c3cn, C3CN_ABORT_RPL_PENDING)) {
c3cn->err =
abort_status_to_errno(c3cn, req->status, &rst_status);
c3cn_closed(c3cn);
}
}
static int do_abort_req(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
{
const struct cpl_abort_req_rss *req = cplhdr(skb);
struct s3_conn *c3cn = ctx;
c3cn_conn_debug("rcv, c3cn 0x%p, s 0x%x, f 0x%lx.\n",
c3cn, c3cn->state, c3cn->flags);
if (req->status == CPL_ERR_RTX_NEG_ADVICE ||
req->status == CPL_ERR_PERSIST_NEG_ADVICE) {
__kfree_skb(skb);
return 0;
}
process_cpl_msg_ref(process_abort_req, c3cn, skb);
return 0;
}
/*
* Process ABORT_RPL_RSS CPL message: -> host
* Process abort replies. We only process these messages if we anticipate
* them as the coordination between SW and HW in this area is somewhat lacking
* and sometimes we get ABORT_RPLs after we are done with the connection that
* originated the ABORT_REQ.
*/
static void process_abort_rpl(struct s3_conn *c3cn, struct sk_buff *skb)
{
c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n",
c3cn, c3cn->state, c3cn->flags);
if (c3cn_flag(c3cn, C3CN_ABORT_RPL_PENDING)) {
if (!c3cn_flag(c3cn, C3CN_ABORT_RPL_RCVD))
c3cn_set_flag(c3cn, C3CN_ABORT_RPL_RCVD);
else {
c3cn_clear_flag(c3cn, C3CN_ABORT_RPL_RCVD);
c3cn_clear_flag(c3cn, C3CN_ABORT_RPL_PENDING);
if (c3cn_flag(c3cn, C3CN_ABORT_REQ_RCVD))
cxgb3i_log_error("%s tid %u, ABORT_RPL_RSS\n",
c3cn->cdev->name, c3cn->tid);
c3cn_closed(c3cn);
}
}
__kfree_skb(skb);
}
static int do_abort_rpl(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
{
struct cpl_abort_rpl_rss *rpl = cplhdr(skb);
struct s3_conn *c3cn = ctx;
c3cn_conn_debug("rcv, status 0x%x, c3cn 0x%p, s %u, 0x%lx.\n",
rpl->status, c3cn, c3cn ? c3cn->state : 0,
c3cn ? c3cn->flags : 0UL);
/*
* Ignore replies to post-close aborts indicating that the abort was
* requested too late. These connections are terminated when we get
* PEER_CLOSE or CLOSE_CON_RPL and by the time the abort_rpl_rss
* arrives the TID is either no longer used or it has been recycled.
*/
if (rpl->status == CPL_ERR_ABORT_FAILED)
goto discard;
/*
* Sometimes we've already closed the connection, e.g., a post-close
* abort races with ABORT_REQ_RSS, the latter frees the connection
* expecting the ABORT_REQ will fail with CPL_ERR_ABORT_FAILED,
* but FW turns the ABORT_REQ into a regular one and so we get
* ABORT_RPL_RSS with status 0 and no connection.
*/
if (!c3cn)
goto discard;
process_cpl_msg_ref(process_abort_rpl, c3cn, skb);
return 0;
discard:
__kfree_skb(skb);
return 0;
}
/*
* Process RX_ISCSI_HDR CPL message: -> host
* Handle received PDUs, the payload could be DDP'ed. If not, the payload
* follow after the bhs.
*/
static void process_rx_iscsi_hdr(struct s3_conn *c3cn, struct sk_buff *skb)
{
struct cpl_iscsi_hdr *hdr_cpl = cplhdr(skb);
struct cpl_iscsi_hdr_norss data_cpl;
struct cpl_rx_data_ddp_norss ddp_cpl;
unsigned int hdr_len, data_len, status;
unsigned int len;
int err;
if (unlikely(c3cn->state >= C3CN_STATE_PASSIVE_CLOSE)) {
if (c3cn->state != C3CN_STATE_ABORTING)
send_abort_req(c3cn);
__kfree_skb(skb);
return;
}
skb_tcp_seq(skb) = ntohl(hdr_cpl->seq);
skb_flags(skb) = 0;
skb_reset_transport_header(skb);
__skb_pull(skb, sizeof(struct cpl_iscsi_hdr));
len = hdr_len = ntohs(hdr_cpl->len);
/* msg coalesce is off or not enough data received */
if (skb->len <= hdr_len) {
cxgb3i_log_error("%s: TID %u, ISCSI_HDR, skb len %u < %u.\n",
c3cn->cdev->name, c3cn->tid,
skb->len, hdr_len);
goto abort_conn;
}
err = skb_copy_bits(skb, skb->len - sizeof(ddp_cpl), &ddp_cpl,
sizeof(ddp_cpl));
if (err < 0)
goto abort_conn;
skb_ulp_mode(skb) = ULP2_FLAG_DATA_READY;
skb_rx_pdulen(skb) = ntohs(ddp_cpl.len);
skb_rx_ddigest(skb) = ntohl(ddp_cpl.ulp_crc);
status = ntohl(ddp_cpl.ddp_status);
c3cn_rx_debug("rx skb 0x%p, len %u, pdulen %u, ddp status 0x%x.\n",
skb, skb->len, skb_rx_pdulen(skb), status);
if (status & (1 << RX_DDP_STATUS_HCRC_SHIFT))
skb_ulp_mode(skb) |= ULP2_FLAG_HCRC_ERROR;
if (status & (1 << RX_DDP_STATUS_DCRC_SHIFT))
skb_ulp_mode(skb) |= ULP2_FLAG_DCRC_ERROR;
if (status & (1 << RX_DDP_STATUS_PAD_SHIFT))
skb_ulp_mode(skb) |= ULP2_FLAG_PAD_ERROR;
if (skb->len > (hdr_len + sizeof(ddp_cpl))) {
err = skb_copy_bits(skb, hdr_len, &data_cpl, sizeof(data_cpl));
if (err < 0)
goto abort_conn;
data_len = ntohs(data_cpl.len);
len += sizeof(data_cpl) + data_len;
} else if (status & (1 << RX_DDP_STATUS_DDP_SHIFT))
skb_ulp_mode(skb) |= ULP2_FLAG_DATA_DDPED;
c3cn->rcv_nxt = ntohl(ddp_cpl.seq) + skb_rx_pdulen(skb);
__pskb_trim(skb, len);
__skb_queue_tail(&c3cn->receive_queue, skb);
cxgb3i_conn_pdu_ready(c3cn);
return;
abort_conn:
send_abort_req(c3cn);
__kfree_skb(skb);
}
static int do_iscsi_hdr(struct t3cdev *t3dev, struct sk_buff *skb, void *ctx)
{
struct s3_conn *c3cn = ctx;
process_cpl_msg(process_rx_iscsi_hdr, c3cn, skb);
return 0;
}
/*
* Process TX_DATA_ACK CPL messages: -> host
* Process an acknowledgment of WR completion. Advance snd_una and send the
* next batch of work requests from the write queue.
*/
static void check_wr_invariants(struct s3_conn *c3cn)
{
int pending = count_pending_wrs(c3cn);
if (unlikely(c3cn->wr_avail + pending != c3cn->wr_max))
cxgb3i_log_error("TID %u: credit imbalance: avail %u, "
"pending %u, total should be %u\n",
c3cn->tid, c3cn->wr_avail, pending,
c3cn->wr_max);
}
static void process_wr_ack(struct s3_conn *c3cn, struct sk_buff *skb)
{
struct cpl_wr_ack *hdr = cplhdr(skb);
unsigned int credits = ntohs(hdr->credits);
u32 snd_una = ntohl(hdr->snd_una);
c3cn_tx_debug("%u WR credits, avail %u, unack %u, TID %u, state %u.\n",
credits, c3cn->wr_avail, c3cn->wr_unacked,
c3cn->tid, c3cn->state);
c3cn->wr_avail += credits;
if (c3cn->wr_unacked > c3cn->wr_max - c3cn->wr_avail)
c3cn->wr_unacked = c3cn->wr_max - c3cn->wr_avail;
while (credits) {
struct sk_buff *p = peek_wr(c3cn);
if (unlikely(!p)) {
cxgb3i_log_error("%u WR_ACK credits for TID %u with "
"nothing pending, state %u\n",
credits, c3cn->tid, c3cn->state);
break;
}
if (unlikely(credits < p->csum)) {
struct tx_data_wr *w = cplhdr(p);
cxgb3i_log_error("TID %u got %u WR credits need %u, "
"len %u, main body %u, frags %u, "
"seq # %u, ACK una %u, ACK nxt %u, "
"WR_AVAIL %u, WRs pending %u\n",
c3cn->tid, credits, p->csum, p->len,
p->len - p->data_len,
skb_shinfo(p)->nr_frags,
ntohl(w->sndseq), snd_una,
ntohl(hdr->snd_nxt), c3cn->wr_avail,
count_pending_wrs(c3cn) - credits);
p->csum -= credits;
break;
} else {
dequeue_wr(c3cn);
credits -= p->csum;
free_wr_skb(p);
}
}
check_wr_invariants(c3cn);
if (unlikely(before(snd_una, c3cn->snd_una))) {
cxgb3i_log_error("TID %u, unexpected sequence # %u in WR_ACK "
"snd_una %u\n",
c3cn->tid, snd_una, c3cn->snd_una);
goto out_free;
}
if (c3cn->snd_una != snd_una) {
c3cn->snd_una = snd_una;
dst_confirm(c3cn->dst_cache);
}
if (skb_queue_len(&c3cn->write_queue)) {
if (c3cn_push_tx_frames(c3cn, 0))
cxgb3i_conn_tx_open(c3cn);
} else
cxgb3i_conn_tx_open(c3cn);
out_free:
__kfree_skb(skb);
}
static int do_wr_ack(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
{
struct s3_conn *c3cn = ctx;
process_cpl_msg(process_wr_ack, c3cn, skb);
return 0;
}
/*
* for each connection, pre-allocate skbs needed for close/abort requests. So
* that we can service the request right away.
*/
static void c3cn_free_cpl_skbs(struct s3_conn *c3cn)
{
if (c3cn->cpl_close)
kfree_skb(c3cn->cpl_close);
if (c3cn->cpl_abort_req)
kfree_skb(c3cn->cpl_abort_req);
if (c3cn->cpl_abort_rpl)
kfree_skb(c3cn->cpl_abort_rpl);
}
static int c3cn_alloc_cpl_skbs(struct s3_conn *c3cn)
{
c3cn->cpl_close = alloc_skb(sizeof(struct cpl_close_con_req),
GFP_KERNEL);
if (!c3cn->cpl_close)
return -ENOMEM;
skb_put(c3cn->cpl_close, sizeof(struct cpl_close_con_req));
c3cn->cpl_abort_req = alloc_skb(sizeof(struct cpl_abort_req),
GFP_KERNEL);
if (!c3cn->cpl_abort_req)
goto free_cpl_skbs;
skb_put(c3cn->cpl_abort_req, sizeof(struct cpl_abort_req));
c3cn->cpl_abort_rpl = alloc_skb(sizeof(struct cpl_abort_rpl),
GFP_KERNEL);
if (!c3cn->cpl_abort_rpl)
goto free_cpl_skbs;
skb_put(c3cn->cpl_abort_rpl, sizeof(struct cpl_abort_rpl));
return 0;
free_cpl_skbs:
c3cn_free_cpl_skbs(c3cn);
return -ENOMEM;
}
/**
* c3cn_release_offload_resources - release offload resource
* @c3cn: the offloaded iscsi tcp connection.
* Release resources held by an offload connection (TID, L2T entry, etc.)
*/
static void c3cn_release_offload_resources(struct s3_conn *c3cn)
{
struct t3cdev *cdev = c3cn->cdev;
unsigned int tid = c3cn->tid;
c3cn->qset = 0;
c3cn_free_cpl_skbs(c3cn);
if (c3cn->wr_avail != c3cn->wr_max) {
purge_wr_queue(c3cn);
reset_wr_list(c3cn);
}
if (cdev) {
if (c3cn->l2t) {
l2t_release(L2DATA(cdev), c3cn->l2t);
c3cn->l2t = NULL;
}
if (c3cn->state == C3CN_STATE_CONNECTING)
/* we have ATID */
s3_free_atid(cdev, tid);
else {
/* we have TID */
cxgb3_remove_tid(cdev, (void *)c3cn, tid);
c3cn_put(c3cn);
}
}
c3cn->dst_cache = NULL;
c3cn->cdev = NULL;
}
/**
* cxgb3i_c3cn_create - allocate and initialize an s3_conn structure
* returns the s3_conn structure allocated.
*/
struct s3_conn *cxgb3i_c3cn_create(void)
{
struct s3_conn *c3cn;
c3cn = kzalloc(sizeof(*c3cn), GFP_KERNEL);
if (!c3cn)
return NULL;
/* pre-allocate close/abort cpl, so we don't need to wait for memory
when close/abort is requested. */
if (c3cn_alloc_cpl_skbs(c3cn) < 0)
goto free_c3cn;
c3cn_conn_debug("alloc c3cn 0x%p.\n", c3cn);
c3cn->flags = 0;
spin_lock_init(&c3cn->lock);
atomic_set(&c3cn->refcnt, 1);
skb_queue_head_init(&c3cn->receive_queue);
skb_queue_head_init(&c3cn->write_queue);
setup_timer(&c3cn->retry_timer, NULL, (unsigned long)c3cn);
rwlock_init(&c3cn->callback_lock);
return c3cn;
free_c3cn:
kfree(c3cn);
return NULL;
}
static void c3cn_active_close(struct s3_conn *c3cn)
{
int data_lost;
int close_req = 0;
c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n",
c3cn, c3cn->state, c3cn->flags);
dst_confirm(c3cn->dst_cache);
c3cn_hold(c3cn);
spin_lock_bh(&c3cn->lock);
data_lost = skb_queue_len(&c3cn->receive_queue);
__skb_queue_purge(&c3cn->receive_queue);
switch (c3cn->state) {
case C3CN_STATE_CLOSED:
case C3CN_STATE_ACTIVE_CLOSE:
case C3CN_STATE_CLOSE_WAIT_1:
case C3CN_STATE_CLOSE_WAIT_2:
case C3CN_STATE_ABORTING:
/* nothing need to be done */
break;
case C3CN_STATE_CONNECTING:
/* defer until cpl_act_open_rpl or cpl_act_establish */
c3cn_set_flag(c3cn, C3CN_ACTIVE_CLOSE_NEEDED);
break;
case C3CN_STATE_ESTABLISHED:
close_req = 1;
c3cn_set_state(c3cn, C3CN_STATE_ACTIVE_CLOSE);
break;
case C3CN_STATE_PASSIVE_CLOSE:
close_req = 1;
c3cn_set_state(c3cn, C3CN_STATE_CLOSE_WAIT_2);
break;
}
if (close_req) {
if (data_lost)
/* Unread data was tossed, zap the connection. */
send_abort_req(c3cn);
else
send_close_req(c3cn);
}
spin_unlock_bh(&c3cn->lock);
c3cn_put(c3cn);
}
/**
* cxgb3i_c3cn_release - close and release an iscsi tcp connection and any
* resource held
* @c3cn: the iscsi tcp connection
*/
void cxgb3i_c3cn_release(struct s3_conn *c3cn)
{
c3cn_conn_debug("c3cn 0x%p, s %u, f 0x%lx.\n",
c3cn, c3cn->state, c3cn->flags);
if (unlikely(c3cn->state == C3CN_STATE_CONNECTING))
c3cn_set_flag(c3cn, C3CN_ACTIVE_CLOSE_NEEDED);
else if (likely(c3cn->state != C3CN_STATE_CLOSED))
c3cn_active_close(c3cn);
c3cn_put(c3cn);
}
static int is_cxgb3_dev(struct net_device *dev)
{
struct cxgb3i_sdev_data *cdata;
struct net_device *ndev = dev;
if (dev->priv_flags & IFF_802_1Q_VLAN)
ndev = vlan_dev_real_dev(dev);
write_lock(&cdata_rwlock);
list_for_each_entry(cdata, &cdata_list, list) {
struct adap_ports *ports = &cdata->ports;
int i;
for (i = 0; i < ports->nports; i++)
if (ndev == ports->lldevs[i]) {
write_unlock(&cdata_rwlock);
return 1;
}
}
write_unlock(&cdata_rwlock);
return 0;
}
/**
* cxgb3_egress_dev - return the cxgb3 egress device
* @root_dev: the root device anchoring the search
* @c3cn: the connection used to determine egress port in bonding mode
* @context: in bonding mode, indicates a connection set up or failover
*
* Return egress device or NULL if the egress device isn't one of our ports.
*/
static struct net_device *cxgb3_egress_dev(struct net_device *root_dev,
struct s3_conn *c3cn,
int context)
{
while (root_dev) {
if (root_dev->priv_flags & IFF_802_1Q_VLAN)
root_dev = vlan_dev_real_dev(root_dev);
else if (is_cxgb3_dev(root_dev))
return root_dev;
else
return NULL;
}
return NULL;
}
static struct rtable *find_route(struct net_device *dev,
__be32 saddr, __be32 daddr,
__be16 sport, __be16 dport)
{
struct rtable *rt;
struct flowi fl = {
.oif = dev ? dev->ifindex : 0,
.nl_u = {
.ip4_u = {
.daddr = daddr,
.saddr = saddr,
.tos = 0 } },
.proto = IPPROTO_TCP,
.uli_u = {
.ports = {
.sport = sport,
.dport = dport } } };
if (ip_route_output_flow(&init_net, &rt, &fl, NULL, 0))
return NULL;
return rt;
}
/*
* Assign offload parameters to some connection fields.
*/
static void init_offload_conn(struct s3_conn *c3cn,
struct t3cdev *cdev,
struct dst_entry *dst)
{
BUG_ON(c3cn->cdev != cdev);
c3cn->wr_max = c3cn->wr_avail = T3C_DATA(cdev)->max_wrs - 1;
c3cn->wr_unacked = 0;
c3cn->mss_idx = select_mss(c3cn, dst_mtu(dst));
reset_wr_list(c3cn);
}
static int initiate_act_open(struct s3_conn *c3cn, struct net_device *dev)
{
struct cxgb3i_sdev_data *cdata = NDEV2CDATA(dev);
struct t3cdev *cdev = cdata->cdev;
struct dst_entry *dst = c3cn->dst_cache;
struct sk_buff *skb;
c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n",
c3cn, c3cn->state, c3cn->flags);
/*
* Initialize connection data. Note that the flags and ULP mode are
* initialized higher up ...
*/
c3cn->dev = dev;
c3cn->cdev = cdev;
c3cn->tid = cxgb3_alloc_atid(cdev, cdata->client, c3cn);
if (c3cn->tid < 0)
goto out_err;
c3cn->qset = 0;
c3cn->l2t = t3_l2t_get(cdev, dst->neighbour, dev);
if (!c3cn->l2t)
goto free_tid;
skb = alloc_skb(sizeof(struct cpl_act_open_req), GFP_KERNEL);
if (!skb)
goto free_l2t;
skb->sk = (struct sock *)c3cn;
set_arp_failure_handler(skb, act_open_req_arp_failure);
c3cn_hold(c3cn);
init_offload_conn(c3cn, cdev, dst);
c3cn->err = 0;
make_act_open_req(c3cn, skb, c3cn->tid, c3cn->l2t);
l2t_send(cdev, skb, c3cn->l2t);
return 0;
free_l2t:
l2t_release(L2DATA(cdev), c3cn->l2t);
free_tid:
s3_free_atid(cdev, c3cn->tid);
c3cn->tid = 0;
out_err:
return -EINVAL;
}
/**
* cxgb3i_find_dev - find the interface associated with the given address
* @ipaddr: ip address
*/
static struct net_device *
cxgb3i_find_dev(struct net_device *dev, __be32 ipaddr)
{
struct flowi fl;
int err;
struct rtable *rt;
memset(&fl, 0, sizeof(fl));
fl.nl_u.ip4_u.daddr = ipaddr;
err = ip_route_output_key(dev ? dev_net(dev) : &init_net, &rt, &fl);
if (!err)
return (&rt->dst)->dev;
return NULL;
}
/**
* cxgb3i_c3cn_connect - initiates an iscsi tcp connection to a given address
* @c3cn: the iscsi tcp connection
* @usin: destination address
*
* return 0 if active open request is sent, < 0 otherwise.
*/
int cxgb3i_c3cn_connect(struct net_device *dev, struct s3_conn *c3cn,
struct sockaddr_in *usin)
{
struct rtable *rt;
struct cxgb3i_sdev_data *cdata;
struct t3cdev *cdev;
__be32 sipv4;
struct net_device *dstdev;
int err;
c3cn_conn_debug("c3cn 0x%p, dev 0x%p.\n", c3cn, dev);
if (usin->sin_family != AF_INET)
return -EAFNOSUPPORT;
c3cn->daddr.sin_port = usin->sin_port;
c3cn->daddr.sin_addr.s_addr = usin->sin_addr.s_addr;
dstdev = cxgb3i_find_dev(dev, usin->sin_addr.s_addr);
if (!dstdev || !is_cxgb3_dev(dstdev))
return -ENETUNREACH;
if (dstdev->priv_flags & IFF_802_1Q_VLAN)
dev = dstdev;
rt = find_route(dev, c3cn->saddr.sin_addr.s_addr,
c3cn->daddr.sin_addr.s_addr,
c3cn->saddr.sin_port,
c3cn->daddr.sin_port);
if (rt == NULL) {
c3cn_conn_debug("NO route to 0x%x, port %u, dev %s.\n",
c3cn->daddr.sin_addr.s_addr,
ntohs(c3cn->daddr.sin_port),
dev ? dev->name : "any");
return -ENETUNREACH;
}
if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) {
c3cn_conn_debug("multi-cast route to 0x%x, port %u, dev %s.\n",
c3cn->daddr.sin_addr.s_addr,
ntohs(c3cn->daddr.sin_port),
dev ? dev->name : "any");
ip_rt_put(rt);
return -ENETUNREACH;
}
if (!c3cn->saddr.sin_addr.s_addr)
c3cn->saddr.sin_addr.s_addr = rt->rt_src;
/* now commit destination to connection */
c3cn->dst_cache = &rt->dst;
/* try to establish an offloaded connection */
dev = cxgb3_egress_dev(c3cn->dst_cache->dev, c3cn, 0);
if (dev == NULL) {
c3cn_conn_debug("c3cn 0x%p, egress dev NULL.\n", c3cn);
return -ENETUNREACH;
}
cdata = NDEV2CDATA(dev);
cdev = cdata->cdev;
/* get a source port if one hasn't been provided */
err = c3cn_get_port(c3cn, cdata);
if (err)
return err;
c3cn_conn_debug("c3cn 0x%p get port %u.\n",
c3cn, ntohs(c3cn->saddr.sin_port));
sipv4 = cxgb3i_get_private_ipv4addr(dev);
if (!sipv4) {
c3cn_conn_debug("c3cn 0x%p, iscsi ip not configured.\n", c3cn);
sipv4 = c3cn->saddr.sin_addr.s_addr;
cxgb3i_set_private_ipv4addr(dev, sipv4);
} else
c3cn->saddr.sin_addr.s_addr = sipv4;
c3cn_conn_debug("c3cn 0x%p, %pI4,%u-%pI4,%u SYN_SENT.\n",
c3cn,
&c3cn->saddr.sin_addr.s_addr,
ntohs(c3cn->saddr.sin_port),
&c3cn->daddr.sin_addr.s_addr,
ntohs(c3cn->daddr.sin_port));
c3cn_set_state(c3cn, C3CN_STATE_CONNECTING);
if (!initiate_act_open(c3cn, dev))
return 0;
/*
* If we get here, we don't have an offload connection so simply
* return a failure.
*/
err = -ENOTSUPP;
/*
* This trashes the connection and releases the local port,
* if necessary.
*/
c3cn_conn_debug("c3cn 0x%p -> CLOSED.\n", c3cn);
c3cn_set_state(c3cn, C3CN_STATE_CLOSED);
ip_rt_put(rt);
c3cn_put_port(c3cn);
return err;
}
/**
* cxgb3i_c3cn_rx_credits - ack received tcp data.
* @c3cn: iscsi tcp connection
* @copied: # of bytes processed
*
* Called after some received data has been read. It returns RX credits
* to the HW for the amount of data processed.
*/
void cxgb3i_c3cn_rx_credits(struct s3_conn *c3cn, int copied)
{
struct t3cdev *cdev;
int must_send;
u32 credits, dack = 0;
if (c3cn->state != C3CN_STATE_ESTABLISHED)
return;
credits = c3cn->copied_seq - c3cn->rcv_wup;
if (unlikely(!credits))
return;
cdev = c3cn->cdev;
if (unlikely(cxgb3_rx_credit_thres == 0))
return;
dack = F_RX_DACK_CHANGE | V_RX_DACK_MODE(1);
/*
* For coalescing to work effectively ensure the receive window has
* at least 16KB left.
*/
must_send = credits + 16384 >= cxgb3_rcv_win;
if (must_send || credits >= cxgb3_rx_credit_thres)
c3cn->rcv_wup += send_rx_credits(c3cn, credits, dack);
}
/**
* cxgb3i_c3cn_send_pdus - send the skbs containing iscsi pdus
* @c3cn: iscsi tcp connection
* @skb: skb contains the iscsi pdu
*
* Add a list of skbs to a connection send queue. The skbs must comply with
* the max size limit of the device and have a headroom of at least
* TX_HEADER_LEN bytes.
* Return # of bytes queued.
*/
int cxgb3i_c3cn_send_pdus(struct s3_conn *c3cn, struct sk_buff *skb)
{
struct sk_buff *next;
int err, copied = 0;
spin_lock_bh(&c3cn->lock);
if (c3cn->state != C3CN_STATE_ESTABLISHED) {
c3cn_tx_debug("c3cn 0x%p, not in est. state %u.\n",
c3cn, c3cn->state);
err = -EAGAIN;
goto out_err;
}
if (c3cn->err) {
c3cn_tx_debug("c3cn 0x%p, err %d.\n", c3cn, c3cn->err);
err = -EPIPE;
goto out_err;
}
if (c3cn->write_seq - c3cn->snd_una >= cxgb3_snd_win) {
c3cn_tx_debug("c3cn 0x%p, snd %u - %u > %u.\n",
c3cn, c3cn->write_seq, c3cn->snd_una,
cxgb3_snd_win);
err = -ENOBUFS;
goto out_err;
}
while (skb) {
int frags = skb_shinfo(skb)->nr_frags +
(skb->len != skb->data_len);
if (unlikely(skb_headroom(skb) < TX_HEADER_LEN)) {
c3cn_tx_debug("c3cn 0x%p, skb head.\n", c3cn);
err = -EINVAL;
goto out_err;
}
if (frags >= SKB_WR_LIST_SIZE) {
cxgb3i_log_error("c3cn 0x%p, tx frags %d, len %u,%u.\n",
c3cn, skb_shinfo(skb)->nr_frags,
skb->len, skb->data_len);
err = -EINVAL;
goto out_err;
}
next = skb->next;
skb->next = NULL;
skb_entail(c3cn, skb, C3CB_FLAG_NO_APPEND | C3CB_FLAG_NEED_HDR);
copied += skb->len;
c3cn->write_seq += skb->len + ulp_extra_len(skb);
skb = next;
}
done:
if (likely(skb_queue_len(&c3cn->write_queue)))
c3cn_push_tx_frames(c3cn, 1);
spin_unlock_bh(&c3cn->lock);
return copied;
out_err:
if (copied == 0 && err == -EPIPE)
copied = c3cn->err ? c3cn->err : -EPIPE;
else
copied = err;
goto done;
}
static void sdev_data_cleanup(struct cxgb3i_sdev_data *cdata)
{
struct adap_ports *ports = &cdata->ports;
struct s3_conn *c3cn;
int i;
for (i = 0; i < cxgb3_max_connect; i++) {
if (cdata->sport_conn[i]) {
c3cn = cdata->sport_conn[i];
cdata->sport_conn[i] = NULL;
spin_lock_bh(&c3cn->lock);
c3cn->cdev = NULL;
c3cn_set_flag(c3cn, C3CN_OFFLOAD_DOWN);
c3cn_closed(c3cn);
spin_unlock_bh(&c3cn->lock);
}
}
for (i = 0; i < ports->nports; i++)
NDEV2CDATA(ports->lldevs[i]) = NULL;
cxgb3i_free_big_mem(cdata);
}
void cxgb3i_sdev_cleanup(void)
{
struct cxgb3i_sdev_data *cdata;
write_lock(&cdata_rwlock);
list_for_each_entry(cdata, &cdata_list, list) {
list_del(&cdata->list);
sdev_data_cleanup(cdata);
}
write_unlock(&cdata_rwlock);
}
int cxgb3i_sdev_init(cxgb3_cpl_handler_func *cpl_handlers)
{
cpl_handlers[CPL_ACT_ESTABLISH] = do_act_establish;
cpl_handlers[CPL_ACT_OPEN_RPL] = do_act_open_rpl;
cpl_handlers[CPL_PEER_CLOSE] = do_peer_close;
cpl_handlers[CPL_ABORT_REQ_RSS] = do_abort_req;
cpl_handlers[CPL_ABORT_RPL_RSS] = do_abort_rpl;
cpl_handlers[CPL_CLOSE_CON_RPL] = do_close_con_rpl;
cpl_handlers[CPL_TX_DMA_ACK] = do_wr_ack;
cpl_handlers[CPL_ISCSI_HDR] = do_iscsi_hdr;
if (cxgb3_max_connect > CXGB3I_MAX_CONN)
cxgb3_max_connect = CXGB3I_MAX_CONN;
return 0;
}
/**
* cxgb3i_sdev_add - allocate and initialize resources for each adapter found
* @cdev: t3cdev adapter
* @client: cxgb3 driver client
*/
void cxgb3i_sdev_add(struct t3cdev *cdev, struct cxgb3_client *client)
{
struct cxgb3i_sdev_data *cdata;
struct ofld_page_info rx_page_info;
unsigned int wr_len;
int mapsize = cxgb3_max_connect * sizeof(struct s3_conn *);
int i;
cdata = cxgb3i_alloc_big_mem(sizeof(*cdata) + mapsize, GFP_KERNEL);
if (!cdata) {
cxgb3i_log_warn("t3dev 0x%p, offload up, OOM %d.\n",
cdev, mapsize);
return;
}
if (cdev->ctl(cdev, GET_WR_LEN, &wr_len) < 0 ||
cdev->ctl(cdev, GET_PORTS, &cdata->ports) < 0 ||
cdev->ctl(cdev, GET_RX_PAGE_INFO, &rx_page_info) < 0) {
cxgb3i_log_warn("t3dev 0x%p, offload up, ioctl failed.\n",
cdev);
goto free_cdata;
}
s3_init_wr_tab(wr_len);
spin_lock_init(&cdata->lock);
INIT_LIST_HEAD(&cdata->list);
cdata->cdev = cdev;
cdata->client = client;
for (i = 0; i < cdata->ports.nports; i++)
NDEV2CDATA(cdata->ports.lldevs[i]) = cdata;
write_lock(&cdata_rwlock);
list_add_tail(&cdata->list, &cdata_list);
write_unlock(&cdata_rwlock);
cxgb3i_log_info("t3dev 0x%p, offload up, added.\n", cdev);
return;
free_cdata:
cxgb3i_free_big_mem(cdata);
}
/**
* cxgb3i_sdev_remove - free the allocated resources for the adapter
* @cdev: t3cdev adapter
*/
void cxgb3i_sdev_remove(struct t3cdev *cdev)
{
struct cxgb3i_sdev_data *cdata = CXGB3_SDEV_DATA(cdev);
cxgb3i_log_info("t3dev 0x%p, offload down, remove.\n", cdev);
write_lock(&cdata_rwlock);
list_del(&cdata->list);
write_unlock(&cdata_rwlock);
sdev_data_cleanup(cdata);
}
drivers/scsi/cxgb3i/cxgb3i_offload.h deleted 100644 → 0
View file @ 7b36b6e0
/*
* cxgb3i_offload.h: Chelsio S3xx iscsi offloaded tcp connection management
*
* Copyright (C) 2003-2008 Chelsio Communications. All rights reserved.
*
* 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 LICENSE file included in this
* release for licensing terms and conditions.
*
* Written by: Dimitris Michailidis (dm@chelsio.com)
* Karen Xie (kxie@chelsio.com)
*/
#ifndef _CXGB3I_OFFLOAD_H
#define _CXGB3I_OFFLOAD_H
#include <linux/skbuff.h>
#include <linux/in.h>
#include "common.h"
#include "adapter.h"
#include "t3cdev.h"
#include "cxgb3_offload.h"
#define cxgb3i_log_error(fmt...) printk(KERN_ERR "cxgb3i: ERR! " fmt)
#define cxgb3i_log_warn(fmt...) printk(KERN_WARNING "cxgb3i: WARN! " fmt)
#define cxgb3i_log_info(fmt...) printk(KERN_INFO "cxgb3i: " fmt)
#define cxgb3i_log_debug(fmt, args...) \
printk(KERN_INFO "cxgb3i: %s - " fmt, __func__ , ## args)
/**
* struct s3_conn - an iscsi tcp connection structure
*
* @dev: net device of with connection
* @cdev: adapter t3cdev for net device
* @flags: see c3cn_flags below
* @tid: connection id assigned by the h/w
* @qset: queue set used by connection
* @mss_idx: Maximum Segment Size table index
* @l2t: ARP resolution entry for offload packets
* @wr_max: maximum in-flight writes
* @wr_avail: number of writes available
* @wr_unacked: writes since last request for completion notification
* @wr_pending_head: head of pending write queue
* @wr_pending_tail: tail of pending write queue
* @cpl_close: skb for cpl_close_req
* @cpl_abort_req: skb for cpl_abort_req
* @cpl_abort_rpl: skb for cpl_abort_rpl
* @lock: connection status lock
* @refcnt: reference count on connection
* @state: connection state
* @saddr: source ip/port address
* @daddr: destination ip/port address
* @dst_cache: reference to destination route
* @receive_queue: received PDUs
* @write_queue: un-pushed pending writes
* @retry_timer: retry timer for various operations
* @err: connection error status
* @callback_lock: lock for opaque user context
* @user_data: opaque user context
* @rcv_nxt: next receive seq. #
* @copied_seq: head of yet unread data
* @rcv_wup: rcv_nxt on last window update sent
* @snd_nxt: next sequence we send
* @snd_una: first byte we want an ack for
* @write_seq: tail+1 of data held in send buffer
*/
struct s3_conn {
struct net_device *dev;
struct t3cdev *cdev;
unsigned long flags;
int tid;
int qset;
int mss_idx;
struct l2t_entry *l2t;
int wr_max;
int wr_avail;
int wr_unacked;
struct sk_buff *wr_pending_head;
struct sk_buff *wr_pending_tail;
struct sk_buff *cpl_close;
struct sk_buff *cpl_abort_req;
struct sk_buff *cpl_abort_rpl;
spinlock_t lock;
atomic_t refcnt;
volatile unsigned int state;
struct sockaddr_in saddr;
struct sockaddr_in daddr;
struct dst_entry *dst_cache;
struct sk_buff_head receive_queue;
struct sk_buff_head write_queue;
struct timer_list retry_timer;
int err;
rwlock_t callback_lock;
void *user_data;
u32 rcv_nxt;
u32 copied_seq;
u32 rcv_wup;
u32 snd_nxt;
u32 snd_una;
u32 write_seq;
};
/*
* connection state
*/
enum conn_states {
C3CN_STATE_CONNECTING = 1,
C3CN_STATE_ESTABLISHED,
C3CN_STATE_ACTIVE_CLOSE,
C3CN_STATE_PASSIVE_CLOSE,
C3CN_STATE_CLOSE_WAIT_1,
C3CN_STATE_CLOSE_WAIT_2,
C3CN_STATE_ABORTING,
C3CN_STATE_CLOSED,
};
static inline unsigned int c3cn_is_closing(const struct s3_conn *c3cn)
{
return c3cn->state >= C3CN_STATE_ACTIVE_CLOSE;
}
static inline unsigned int c3cn_is_established(const struct s3_conn *c3cn)
{
return c3cn->state == C3CN_STATE_ESTABLISHED;
}
/*
* Connection flags -- many to track some close related events.
*/
enum c3cn_flags {
C3CN_ABORT_RPL_RCVD, /* received one ABORT_RPL_RSS message */
C3CN_ABORT_REQ_RCVD, /* received one ABORT_REQ_RSS message */
C3CN_ABORT_RPL_PENDING, /* expecting an abort reply */
C3CN_TX_DATA_SENT, /* already sent a TX_DATA WR */
C3CN_ACTIVE_CLOSE_NEEDED, /* need to be closed */
C3CN_OFFLOAD_DOWN /* offload function off */
};
/**
* cxgb3i_sdev_data - Per adapter data.
* Linked off of each Ethernet device port on the adapter.
* Also available via the t3cdev structure since we have pointers to our port
* net_device's there ...
*
* @list: list head to link elements
* @cdev: t3cdev adapter
* @client: CPL client pointer
* @ports: array of adapter ports
* @sport_next: next port
* @sport_conn: source port connection
*/
struct cxgb3i_sdev_data {
struct list_head list;
struct t3cdev *cdev;
struct cxgb3_client *client;
struct adap_ports ports;
spinlock_t lock;
unsigned int sport_next;
struct s3_conn *sport_conn[0];
};
#define NDEV2CDATA(ndev) (*(struct cxgb3i_sdev_data **)&(ndev)->ec_ptr)
#define CXGB3_SDEV_DATA(cdev) NDEV2CDATA((cdev)->lldev)
void cxgb3i_sdev_cleanup(void);
int cxgb3i_sdev_init(cxgb3_cpl_handler_func *);
void cxgb3i_sdev_add(struct t3cdev *, struct cxgb3_client *);
void cxgb3i_sdev_remove(struct t3cdev *);
struct s3_conn *cxgb3i_c3cn_create(void);
int cxgb3i_c3cn_connect(struct net_device *, struct s3_conn *,
struct sockaddr_in *);
void cxgb3i_c3cn_rx_credits(struct s3_conn *, int);
int cxgb3i_c3cn_send_pdus(struct s3_conn *, struct sk_buff *);
void cxgb3i_c3cn_release(struct s3_conn *);
/**
* cxgb3_skb_cb - control block for received pdu state and ULP mode management.
*
* @flag: see C3CB_FLAG_* below
* @ulp_mode: ULP mode/submode of sk_buff
* @seq: tcp sequence number
*/
struct cxgb3_skb_rx_cb {
__u32 ddigest; /* data digest */
__u32 pdulen; /* recovered pdu length */
};
struct cxgb3_skb_tx_cb {
struct sk_buff *wr_next; /* next wr */
};
struct cxgb3_skb_cb {
__u8 flags;
__u8 ulp_mode;
__u32 seq;
union {
struct cxgb3_skb_rx_cb rx;
struct cxgb3_skb_tx_cb tx;
};
};
#define CXGB3_SKB_CB(skb) ((struct cxgb3_skb_cb *)&((skb)->cb[0]))
#define skb_flags(skb) (CXGB3_SKB_CB(skb)->flags)
#define skb_ulp_mode(skb) (CXGB3_SKB_CB(skb)->ulp_mode)
#define skb_tcp_seq(skb) (CXGB3_SKB_CB(skb)->seq)
#define skb_rx_ddigest(skb) (CXGB3_SKB_CB(skb)->rx.ddigest)
#define skb_rx_pdulen(skb) (CXGB3_SKB_CB(skb)->rx.pdulen)
#define skb_tx_wr_next(skb) (CXGB3_SKB_CB(skb)->tx.wr_next)
enum c3cb_flags {
C3CB_FLAG_NEED_HDR = 1 << 0, /* packet needs a TX_DATA_WR header */
C3CB_FLAG_NO_APPEND = 1 << 1, /* don't grow this skb */
C3CB_FLAG_COMPL = 1 << 2, /* request WR completion */
};
/**
* sge_opaque_hdr -
* Opaque version of structure the SGE stores at skb->head of TX_DATA packets
* and for which we must reserve space.
*/
struct sge_opaque_hdr {
void *dev;
dma_addr_t addr[MAX_SKB_FRAGS + 1];
};
/* for TX: a skb must have a headroom of at least TX_HEADER_LEN bytes */
#define TX_HEADER_LEN \
(sizeof(struct tx_data_wr) + sizeof(struct sge_opaque_hdr))
#define SKB_TX_HEADROOM SKB_MAX_HEAD(TX_HEADER_LEN)
/*
* get and set private ip for iscsi traffic
*/
#define cxgb3i_get_private_ipv4addr(ndev) \
(((struct port_info *)(netdev_priv(ndev)))->iscsi_ipv4addr)
#define cxgb3i_set_private_ipv4addr(ndev, addr) \
(((struct port_info *)(netdev_priv(ndev)))->iscsi_ipv4addr) = addr
/* max. connections per adapter */
#define CXGB3I_MAX_CONN 16384
#endif /* _CXGB3_OFFLOAD_H */
drivers/scsi/cxgb3i/cxgb3i_pdu.c deleted 100644 → 0
View file @ 7b36b6e0
/*
* cxgb3i_pdu.c: Chelsio S3xx iSCSI driver.
*
* Copyright (c) 2008 Chelsio Communications, Inc.
* Copyright (c) 2008 Mike Christie
* Copyright (c) 2008 Red Hat, Inc. All rights reserved.
*
* 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.
*
* Written by: Karen Xie (kxie@chelsio.com)
*/
#include <linux/slab.h>
#include <linux/skbuff.h>
#include <linux/crypto.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_host.h>
#include "cxgb3i.h"
#include "cxgb3i_pdu.h"
#ifdef __DEBUG_CXGB3I_RX__
#define cxgb3i_rx_debug cxgb3i_log_debug
#else
#define cxgb3i_rx_debug(fmt...)
#endif
#ifdef __DEBUG_CXGB3I_TX__
#define cxgb3i_tx_debug cxgb3i_log_debug
#else
#define cxgb3i_tx_debug(fmt...)
#endif
/* always allocate rooms for AHS */
#define SKB_TX_PDU_HEADER_LEN \
(sizeof(struct iscsi_hdr) + ISCSI_MAX_AHS_SIZE)
static unsigned int skb_extra_headroom;
static struct page *pad_page;
/*
* pdu receive, interact with libiscsi_tcp
*/
static inline int read_pdu_skb(struct iscsi_conn *conn, struct sk_buff *skb,
unsigned int offset, int offloaded)
{
int status = 0;
int bytes_read;
bytes_read = iscsi_tcp_recv_skb(conn, skb, offset, offloaded, &status);
switch (status) {
case ISCSI_TCP_CONN_ERR:
return -EIO;
case ISCSI_TCP_SUSPENDED:
/* no transfer - just have caller flush queue */
return bytes_read;
case ISCSI_TCP_SKB_DONE:
/*
* pdus should always fit in the skb and we should get
* segment done notifcation.
*/
iscsi_conn_printk(KERN_ERR, conn, "Invalid pdu or skb.");
return -EFAULT;
case ISCSI_TCP_SEGMENT_DONE:
return bytes_read;
default:
iscsi_conn_printk(KERN_ERR, conn, "Invalid iscsi_tcp_recv_skb "
"status %d\n", status);
return -EINVAL;
}
}
static int cxgb3i_conn_read_pdu_skb(struct iscsi_conn *conn,
struct sk_buff *skb)
{
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
bool offloaded = 0;
unsigned int offset;
int rc;
cxgb3i_rx_debug("conn 0x%p, skb 0x%p, len %u, flag 0x%x.\n",
conn, skb, skb->len, skb_ulp_mode(skb));
if (!iscsi_tcp_recv_segment_is_hdr(tcp_conn)) {
iscsi_conn_failure(conn, ISCSI_ERR_PROTO);
return -EIO;
}
if (conn->hdrdgst_en && (skb_ulp_mode(skb) & ULP2_FLAG_HCRC_ERROR)) {
iscsi_conn_failure(conn, ISCSI_ERR_HDR_DGST);
return -EIO;
}
if (conn->datadgst_en && (skb_ulp_mode(skb) & ULP2_FLAG_DCRC_ERROR)) {
iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
return -EIO;
}
/* iscsi hdr */
rc = read_pdu_skb(conn, skb, 0, 0);
if (rc <= 0)
return rc;
if (iscsi_tcp_recv_segment_is_hdr(tcp_conn))
return 0;
offset = rc;
if (conn->hdrdgst_en)
offset += ISCSI_DIGEST_SIZE;
/* iscsi data */
if (skb_ulp_mode(skb) & ULP2_FLAG_DATA_DDPED) {
cxgb3i_rx_debug("skb 0x%p, opcode 0x%x, data %u, ddp'ed, "
"itt 0x%x.\n",
skb,
tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK,
tcp_conn->in.datalen,
ntohl(tcp_conn->in.hdr->itt));
offloaded = 1;
} else {
cxgb3i_rx_debug("skb 0x%p, opcode 0x%x, data %u, NOT ddp'ed, "
"itt 0x%x.\n",
skb,
tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK,
tcp_conn->in.datalen,
ntohl(tcp_conn->in.hdr->itt));
offset += sizeof(struct cpl_iscsi_hdr_norss);
}
rc = read_pdu_skb(conn, skb, offset, offloaded);
if (rc < 0)
return rc;
else
return 0;
}
/*
* pdu transmit, interact with libiscsi_tcp
*/
static inline void tx_skb_setmode(struct sk_buff *skb, int hcrc, int dcrc)
{
u8 submode = 0;
if (hcrc)
submode |= 1;
if (dcrc)
submode |= 2;
skb_ulp_mode(skb) = (ULP_MODE_ISCSI << 4) | submode;
}
void cxgb3i_conn_cleanup_task(struct iscsi_task *task)
{
struct cxgb3i_task_data *tdata = task->dd_data +
sizeof(struct iscsi_tcp_task);
/* never reached the xmit task callout */
if (tdata->skb)
__kfree_skb(tdata->skb);
memset(tdata, 0, sizeof(struct cxgb3i_task_data));
/* MNC - Do we need a check in case this is called but
* cxgb3i_conn_alloc_pdu has never been called on the task */
cxgb3i_release_itt(task, task->hdr_itt);
iscsi_tcp_cleanup_task(task);
}
static int sgl_seek_offset(struct scatterlist *sgl, unsigned int sgcnt,
unsigned int offset, unsigned int *off,
struct scatterlist **sgp)
{
int i;
struct scatterlist *sg;
for_each_sg(sgl, sg, sgcnt, i) {
if (offset < sg->length) {
*off = offset;
*sgp = sg;
return 0;
}
offset -= sg->length;
}
return -EFAULT;
}
static int sgl_read_to_frags(struct scatterlist *sg, unsigned int sgoffset,
unsigned int dlen, skb_frag_t *frags,
int frag_max)
{
unsigned int datalen = dlen;
unsigned int sglen = sg->length - sgoffset;
struct page *page = sg_page(sg);
int i;
i = 0;
do {
unsigned int copy;
if (!sglen) {
sg = sg_next(sg);
if (!sg) {
cxgb3i_log_error("%s, sg NULL, len %u/%u.\n",
__func__, datalen, dlen);
return -EINVAL;
}
sgoffset = 0;
sglen = sg->length;
page = sg_page(sg);
}
copy = min(datalen, sglen);
if (i && page == frags[i - 1].page &&
sgoffset + sg->offset ==
frags[i - 1].page_offset + frags[i - 1].size) {
frags[i - 1].size += copy;
} else {
if (i >= frag_max) {
cxgb3i_log_error("%s, too many pages %u, "
"dlen %u.\n", __func__,
frag_max, dlen);
return -EINVAL;
}
frags[i].page = page;
frags[i].page_offset = sg->offset + sgoffset;
frags[i].size = copy;
i++;
}
datalen -= copy;
sgoffset += copy;
sglen -= copy;
} while (datalen);
return i;
}
int cxgb3i_conn_alloc_pdu(struct iscsi_task *task, u8 opcode)
{
struct iscsi_conn *conn = task->conn;
struct iscsi_tcp_task *tcp_task = task->dd_data;
struct cxgb3i_task_data *tdata = task->dd_data + sizeof(*tcp_task);
struct scsi_cmnd *sc = task->sc;
int headroom = SKB_TX_PDU_HEADER_LEN;
tcp_task->dd_data = tdata;
task->hdr = NULL;
/* write command, need to send data pdus */
if (skb_extra_headroom && (opcode == ISCSI_OP_SCSI_DATA_OUT ||
(opcode == ISCSI_OP_SCSI_CMD &&
(scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_TO_DEVICE))))
headroom += min(skb_extra_headroom, conn->max_xmit_dlength);
tdata->skb = alloc_skb(TX_HEADER_LEN + headroom, GFP_ATOMIC);
if (!tdata->skb)
return -ENOMEM;
skb_reserve(tdata->skb, TX_HEADER_LEN);
cxgb3i_tx_debug("task 0x%p, opcode 0x%x, skb 0x%p.\n",
task, opcode, tdata->skb);
task->hdr = (struct iscsi_hdr *)tdata->skb->data;
task->hdr_max = SKB_TX_PDU_HEADER_LEN;
/* data_out uses scsi_cmd's itt */
if (opcode != ISCSI_OP_SCSI_DATA_OUT)
cxgb3i_reserve_itt(task, &task->hdr->itt);
return 0;
}
int cxgb3i_conn_init_pdu(struct iscsi_task *task, unsigned int offset,
unsigned int count)
{
struct iscsi_conn *conn = task->conn;
struct iscsi_tcp_task *tcp_task = task->dd_data;
struct cxgb3i_task_data *tdata = tcp_task->dd_data;
struct sk_buff *skb = tdata->skb;
unsigned int datalen = count;
int i, padlen = iscsi_padding(count);
struct page *pg;
cxgb3i_tx_debug("task 0x%p,0x%p, offset %u, count %u, skb 0x%p.\n",
task, task->sc, offset, count, skb);
skb_put(skb, task->hdr_len);
tx_skb_setmode(skb, conn->hdrdgst_en, datalen ? conn->datadgst_en : 0);
if (!count)
return 0;
if (task->sc) {
struct scsi_data_buffer *sdb = scsi_out(task->sc);
struct scatterlist *sg = NULL;
int err;
tdata->offset = offset;
tdata->count = count;
err = sgl_seek_offset(sdb->table.sgl, sdb->table.nents,
tdata->offset, &tdata->sgoffset, &sg);
if (err < 0) {
cxgb3i_log_warn("tpdu, sgl %u, bad offset %u/%u.\n",
sdb->table.nents, tdata->offset,
sdb->length);
return err;
}
err = sgl_read_to_frags(sg, tdata->sgoffset, tdata->count,
tdata->frags, MAX_PDU_FRAGS);
if (err < 0) {
cxgb3i_log_warn("tpdu, sgl %u, bad offset %u + %u.\n",
sdb->table.nents, tdata->offset,
tdata->count);
return err;
}
tdata->nr_frags = err;
if (tdata->nr_frags > MAX_SKB_FRAGS ||
(padlen && tdata->nr_frags == MAX_SKB_FRAGS)) {
char *dst = skb->data + task->hdr_len;
skb_frag_t *frag = tdata->frags;
/* data fits in the skb's headroom */
for (i = 0; i < tdata->nr_frags; i++, frag++) {
char *src = kmap_atomic(frag->page,
KM_SOFTIRQ0);
memcpy(dst, src+frag->page_offset, frag->size);
dst += frag->size;
kunmap_atomic(src, KM_SOFTIRQ0);
}
if (padlen) {
memset(dst, 0, padlen);
padlen = 0;
}
skb_put(skb, count + padlen);
} else {
/* data fit into frag_list */
for (i = 0; i < tdata->nr_frags; i++)
get_page(tdata->frags[i].page);
memcpy(skb_shinfo(skb)->frags, tdata->frags,
sizeof(skb_frag_t) * tdata->nr_frags);
skb_shinfo(skb)->nr_frags = tdata->nr_frags;
skb->len += count;
skb->data_len += count;
skb->truesize += count;
}
} else {
pg = virt_to_page(task->data);
get_page(pg);
skb_fill_page_desc(skb, 0, pg, offset_in_page(task->data),
count);
skb->len += count;
skb->data_len += count;
skb->truesize += count;
}
if (padlen) {
i = skb_shinfo(skb)->nr_frags;
get_page(pad_page);
skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags, pad_page, 0,
padlen);
skb->data_len += padlen;
skb->truesize += padlen;
skb->len += padlen;
}
return 0;
}
int cxgb3i_conn_xmit_pdu(struct iscsi_task *task)
{
struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
struct cxgb3i_conn *cconn = tcp_conn->dd_data;
struct iscsi_tcp_task *tcp_task = task->dd_data;
struct cxgb3i_task_data *tdata = tcp_task->dd_data;
struct sk_buff *skb = tdata->skb;
unsigned int datalen;
int err;
if (!skb)
return 0;
datalen = skb->data_len;
tdata->skb = NULL;
err = cxgb3i_c3cn_send_pdus(cconn->cep->c3cn, skb);
if (err > 0) {
int pdulen = err;
cxgb3i_tx_debug("task 0x%p, skb 0x%p, len %u/%u, rv %d.\n",
task, skb, skb->len, skb->data_len, err);
if (task->conn->hdrdgst_en)
pdulen += ISCSI_DIGEST_SIZE;
if (datalen && task->conn->datadgst_en)
pdulen += ISCSI_DIGEST_SIZE;
task->conn->txdata_octets += pdulen;
return 0;
}
if (err == -EAGAIN || err == -ENOBUFS) {
/* reset skb to send when we are called again */
tdata->skb = skb;
return err;
}
kfree_skb(skb);
cxgb3i_tx_debug("itt 0x%x, skb 0x%p, len %u/%u, xmit err %d.\n",
task->itt, skb, skb->len, skb->data_len, err);
iscsi_conn_printk(KERN_ERR, task->conn, "xmit err %d.\n", err);
iscsi_conn_failure(task->conn, ISCSI_ERR_XMIT_FAILED);
return err;
}
int cxgb3i_pdu_init(void)
{
if (SKB_TX_HEADROOM > (512 * MAX_SKB_FRAGS))
skb_extra_headroom = SKB_TX_HEADROOM;
pad_page = alloc_page(GFP_KERNEL);
if (!pad_page)
return -ENOMEM;
memset(page_address(pad_page), 0, PAGE_SIZE);
return 0;
}
void cxgb3i_pdu_cleanup(void)
{
if (pad_page) {
__free_page(pad_page);
pad_page = NULL;
}
}
void cxgb3i_conn_pdu_ready(struct s3_conn *c3cn)
{
struct sk_buff *skb;
unsigned int read = 0;
struct iscsi_conn *conn = c3cn->user_data;
int err = 0;
cxgb3i_rx_debug("cn 0x%p.\n", c3cn);
read_lock(&c3cn->callback_lock);
if (unlikely(!conn || conn->suspend_rx)) {
cxgb3i_rx_debug("conn 0x%p, id %d, suspend_rx %lu!\n",
conn, conn ? conn->id : 0xFF,
conn ? conn->suspend_rx : 0xFF);
read_unlock(&c3cn->callback_lock);
return;
}
skb = skb_peek(&c3cn->receive_queue);
while (!err && skb) {
__skb_unlink(skb, &c3cn->receive_queue);
read += skb_rx_pdulen(skb);
cxgb3i_rx_debug("conn 0x%p, cn 0x%p, rx skb 0x%p, pdulen %u.\n",
conn, c3cn, skb, skb_rx_pdulen(skb));
err = cxgb3i_conn_read_pdu_skb(conn, skb);
__kfree_skb(skb);
skb = skb_peek(&c3cn->receive_queue);
}
read_unlock(&c3cn->callback_lock);
c3cn->copied_seq += read;
cxgb3i_c3cn_rx_credits(c3cn, read);
conn->rxdata_octets += read;
if (err) {
cxgb3i_log_info("conn 0x%p rx failed err %d.\n", conn, err);
iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
}
}
void cxgb3i_conn_tx_open(struct s3_conn *c3cn)
{
struct iscsi_conn *conn = c3cn->user_data;
cxgb3i_tx_debug("cn 0x%p.\n", c3cn);
if (conn) {
cxgb3i_tx_debug("cn 0x%p, cid %d.\n", c3cn, conn->id);
iscsi_conn_queue_work(conn);
}
}
void cxgb3i_conn_closing(struct s3_conn *c3cn)
{
struct iscsi_conn *conn;
read_lock(&c3cn->callback_lock);
conn = c3cn->user_data;
if (conn && c3cn->state != C3CN_STATE_ESTABLISHED)
iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
read_unlock(&c3cn->callback_lock);
}
drivers/scsi/cxgbi/Kconfig
View file @ 6f7efaab
source "drivers/scsi/cxgbi/cxgb3i/Kconfig"
source "drivers/scsi/cxgbi/cxgb4i/Kconfig"
drivers/scsi/cxgbi/Makefile
View file @ 6f7efaab
obj-$(CONFIG_SCSI_CXGB3_ISCSI) += libcxgbi.o cxgb3i/
obj-$(CONFIG_SCSI_CXGB4_ISCSI) += libcxgbi.o cxgb4i/
drivers/scsi/cxgb3i/Kbuild → drivers/scsi/cxgbi/cxgb3i/Kbuild
View file @ 6f7efaab
EXTRA_CFLAGS += -I$(srctree)/drivers/net/cxgb3
cxgb3i-y := cxgb3i_init.o cxgb3i_iscsi.o cxgb3i_pdu.o cxgb3i_offload.o cxgb3i_ddp.o
obj-$(CONFIG_SCSI_CXGB3_ISCSI) += cxgb3i.o
drivers/scsi/cxgb3i/Kconfig → drivers/scsi/cxgbi/cxgb3i/Kconfig
View file @ 6f7efaab
config SCSI_CXGB3_ISCSI
tristate "Chelsio S3xx iSCSI support"
tristate "Chelsio T3 iSCSI support"
depends on CHELSIO_T3_DEPENDS
select CHELSIO_T3
select SCSI_ISCSI_ATTRS
---help---
This driver supports iSCSI offload for the Chelsio S3 series devices.
This driver supports iSCSI offload for the Chelsio T3 devices.
drivers/scsi/cxgbi/cxgb3i/cxgb3i.c 0 → 100644
View file @ 6f7efaab
/*
* cxgb3i_offload.c: Chelsio S3xx iscsi offloaded tcp connection management
*
* Copyright (C) 2003-2008 Chelsio Communications. All rights reserved.
*
* 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 LICENSE file included in this
* release for licensing terms and conditions.
*
* Written by: Dimitris Michailidis (dm@chelsio.com)
* Karen Xie (kxie@chelsio.com)
*/
#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
#include <linux/version.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <scsi/scsi_host.h>
#include "common.h"
#include "t3_cpl.h"
#include "t3cdev.h"
#include "cxgb3_defs.h"
#include "cxgb3_ctl_defs.h"
#include "cxgb3_offload.h"
#include "firmware_exports.h"
#include "cxgb3i.h"
static unsigned int dbg_level;
#include "../libcxgbi.h"
#define DRV_MODULE_NAME "cxgb3i"
#define DRV_MODULE_DESC "Chelsio T3 iSCSI Driver"
#define DRV_MODULE_VERSION "2.0.0"
#define DRV_MODULE_RELDATE "Jun. 2010"
static char version[] =
DRV_MODULE_DESC " " DRV_MODULE_NAME
" v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
MODULE_AUTHOR("Chelsio Communications, Inc.");
MODULE_DESCRIPTION(DRV_MODULE_DESC);
MODULE_VERSION(DRV_MODULE_VERSION);
MODULE_LICENSE("GPL");
module_param(dbg_level, uint, 0644);
MODULE_PARM_DESC(dbg_level, "debug flag (default=0)");
static int cxgb3i_rcv_win = 256 * 1024;
module_param(cxgb3i_rcv_win, int, 0644);
MODULE_PARM_DESC(cxgb3i_rcv_win, "TCP receive window in bytes (default=256KB)");
static int cxgb3i_snd_win = 128 * 1024;
module_param(cxgb3i_snd_win, int, 0644);
MODULE_PARM_DESC(cxgb3i_snd_win, "TCP send window in bytes (default=128KB)");
static int cxgb3i_rx_credit_thres = 10 * 1024;
module_param(cxgb3i_rx_credit_thres, int, 0644);
MODULE_PARM_DESC(rx_credit_thres,
"RX credits return threshold in bytes (default=10KB)");
static unsigned int cxgb3i_max_connect = 8 * 1024;
module_param(cxgb3i_max_connect, uint, 0644);
MODULE_PARM_DESC(cxgb3i_max_connect, "Max. # of connections (default=8092)");
static unsigned int cxgb3i_sport_base = 20000;
module_param(cxgb3i_sport_base, uint, 0644);
MODULE_PARM_DESC(cxgb3i_sport_base, "starting port number (default=20000)");
static void cxgb3i_dev_open(struct t3cdev *);
static void cxgb3i_dev_close(struct t3cdev *);
static void cxgb3i_dev_event_handler(struct t3cdev *, u32, u32);
static struct cxgb3_client t3_client = {
.name = DRV_MODULE_NAME,
.handlers = cxgb3i_cpl_handlers,
.add = cxgb3i_dev_open,
.remove = cxgb3i_dev_close,
.event_handler = cxgb3i_dev_event_handler,
};
static struct scsi_host_template cxgb3i_host_template = {
.module = THIS_MODULE,
.name = DRV_MODULE_NAME,
.proc_name = DRV_MODULE_NAME,
.can_queue = CXGB3I_SCSI_HOST_QDEPTH,
.queuecommand = iscsi_queuecommand,
.change_queue_depth = iscsi_change_queue_depth,
.sg_tablesize = SG_ALL,
.max_sectors = 0xFFFF,
.cmd_per_lun = ISCSI_DEF_CMD_PER_LUN,
.eh_abort_handler = iscsi_eh_abort,
.eh_device_reset_handler = iscsi_eh_device_reset,
.eh_target_reset_handler = iscsi_eh_recover_target,
.target_alloc = iscsi_target_alloc,
.use_clustering = DISABLE_CLUSTERING,
.this_id = -1,
};
static struct iscsi_transport cxgb3i_iscsi_transport = {
.owner = THIS_MODULE,
.name = DRV_MODULE_NAME,
/* owner and name should be set already */
.caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST
| CAP_DATADGST | CAP_DIGEST_OFFLOAD |
CAP_PADDING_OFFLOAD,
.param_mask = ISCSI_MAX_RECV_DLENGTH | ISCSI_MAX_XMIT_DLENGTH |
ISCSI_HDRDGST_EN | ISCSI_DATADGST_EN |
ISCSI_INITIAL_R2T_EN | ISCSI_MAX_R2T |
ISCSI_IMM_DATA_EN | ISCSI_FIRST_BURST |
ISCSI_MAX_BURST | ISCSI_PDU_INORDER_EN |
ISCSI_DATASEQ_INORDER_EN | ISCSI_ERL |
ISCSI_CONN_PORT | ISCSI_CONN_ADDRESS |
ISCSI_EXP_STATSN | ISCSI_PERSISTENT_PORT |
ISCSI_PERSISTENT_ADDRESS |
ISCSI_TARGET_NAME | ISCSI_TPGT |
ISCSI_USERNAME | ISCSI_PASSWORD |
ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN |
ISCSI_FAST_ABORT | ISCSI_ABORT_TMO |
ISCSI_LU_RESET_TMO | ISCSI_TGT_RESET_TMO |
ISCSI_PING_TMO | ISCSI_RECV_TMO |
ISCSI_IFACE_NAME | ISCSI_INITIATOR_NAME,
.host_param_mask = ISCSI_HOST_HWADDRESS | ISCSI_HOST_IPADDRESS |
ISCSI_HOST_INITIATOR_NAME |
ISCSI_HOST_NETDEV_NAME,
.get_host_param = cxgbi_get_host_param,
.set_host_param = cxgbi_set_host_param,
/* session management */
.create_session = cxgbi_create_session,
.destroy_session = cxgbi_destroy_session,
.get_session_param = iscsi_session_get_param,
/* connection management */
.create_conn = cxgbi_create_conn,
.bind_conn = cxgbi_bind_conn,
.destroy_conn = iscsi_tcp_conn_teardown,
.start_conn = iscsi_conn_start,
.stop_conn = iscsi_conn_stop,
.get_conn_param = cxgbi_get_conn_param,
.set_param = cxgbi_set_conn_param,
.get_stats = cxgbi_get_conn_stats,
/* pdu xmit req from user space */
.send_pdu = iscsi_conn_send_pdu,
/* task */
.init_task = iscsi_tcp_task_init,
.xmit_task = iscsi_tcp_task_xmit,
.cleanup_task = cxgbi_cleanup_task,
/* pdu */
.alloc_pdu = cxgbi_conn_alloc_pdu,
.init_pdu = cxgbi_conn_init_pdu,
.xmit_pdu = cxgbi_conn_xmit_pdu,
.parse_pdu_itt = cxgbi_parse_pdu_itt,
/* TCP connect/disconnect */
.ep_connect = cxgbi_ep_connect,
.ep_poll = cxgbi_ep_poll,
.ep_disconnect = cxgbi_ep_disconnect,
/* Error recovery timeout call */
.session_recovery_timedout = iscsi_session_recovery_timedout,
};
static struct scsi_transport_template *cxgb3i_stt;
/*
* CPL (Chelsio Protocol Language) defines a message passing interface between
* the host driver and Chelsio asic.
* The section below implments CPLs that related to iscsi tcp connection
* open/close/abort and data send/receive.
*/
static int push_tx_frames(struct cxgbi_sock *csk, int req_completion);
static void send_act_open_req(struct cxgbi_sock *csk, struct sk_buff *skb,
const struct l2t_entry *e)
{
unsigned int wscale = cxgbi_sock_compute_wscale(cxgb3i_rcv_win);
struct cpl_act_open_req *req = (struct cpl_act_open_req *)skb->head;
skb->priority = CPL_PRIORITY_SETUP;
req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_ACT_OPEN_REQ, csk->atid));
req->local_port = csk->saddr.sin_port;
req->peer_port = csk->daddr.sin_port;
req->local_ip = csk->saddr.sin_addr.s_addr;
req->peer_ip = csk->daddr.sin_addr.s_addr;
req->opt0h = htonl(V_KEEP_ALIVE(1) | F_TCAM_BYPASS |
V_WND_SCALE(wscale) | V_MSS_IDX(csk->mss_idx) |
V_L2T_IDX(e->idx) | V_TX_CHANNEL(e->smt_idx));
req->opt0l = htonl(V_ULP_MODE(ULP2_MODE_ISCSI) |
V_RCV_BUFSIZ(cxgb3i_rcv_win>>10));
log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
"csk 0x%p,%u,0x%lx,%u, %pI4:%u-%pI4:%u, %u,%u,%u.\n",
csk, csk->state, csk->flags, csk->atid,
&req->local_ip, ntohs(req->local_port),
&req->peer_ip, ntohs(req->peer_port),
csk->mss_idx, e->idx, e->smt_idx);
l2t_send(csk->cdev->lldev, skb, csk->l2t);
}
static inline void act_open_arp_failure(struct t3cdev *dev, struct sk_buff *skb)
{
cxgbi_sock_act_open_req_arp_failure(NULL, skb);
}
/*
* CPL connection close request: host ->
*
* Close a connection by sending a CPL_CLOSE_CON_REQ message and queue it to
* the write queue (i.e., after any unsent txt data).
*/
static void send_close_req(struct cxgbi_sock *csk)
{
struct sk_buff *skb = csk->cpl_close;
struct cpl_close_con_req *req = (struct cpl_close_con_req *)skb->head;
unsigned int tid = csk->tid;
log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
"csk 0x%p,%u,0x%lx,%u.\n",
csk, csk->state, csk->flags, csk->tid);
csk->cpl_close = NULL;
req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_CLOSE_CON));
req->wr.wr_lo = htonl(V_WR_TID(tid));
OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_CLOSE_CON_REQ, tid));
req->rsvd = htonl(csk->write_seq);
cxgbi_sock_skb_entail(csk, skb);
if (csk->state >= CTP_ESTABLISHED)
push_tx_frames(csk, 1);
}
/*
* CPL connection abort request: host ->
*
* Send an ABORT_REQ message. Makes sure we do not send multiple ABORT_REQs
* for the same connection and also that we do not try to send a message
* after the connection has closed.
*/
static void abort_arp_failure(struct t3cdev *tdev, struct sk_buff *skb)
{
struct cpl_abort_req *req = cplhdr(skb);
log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
"t3dev 0x%p, tid %u, skb 0x%p.\n",
tdev, GET_TID(req), skb);
req->cmd = CPL_ABORT_NO_RST;
cxgb3_ofld_send(tdev, skb);
}
static void send_abort_req(struct cxgbi_sock *csk)
{
struct sk_buff *skb = csk->cpl_abort_req;
struct cpl_abort_req *req;
if (unlikely(csk->state == CTP_ABORTING || !skb))
return;
cxgbi_sock_set_state(csk, CTP_ABORTING);
cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_PENDING);
/* Purge the send queue so we don't send anything after an abort. */
cxgbi_sock_purge_write_queue(csk);
csk->cpl_abort_req = NULL;
req = (struct cpl_abort_req *)skb->head;
skb->priority = CPL_PRIORITY_DATA;
set_arp_failure_handler(skb, abort_arp_failure);
req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_HOST_ABORT_CON_REQ));
req->wr.wr_lo = htonl(V_WR_TID(csk->tid));
OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_ABORT_REQ, csk->tid));
req->rsvd0 = htonl(csk->snd_nxt);
req->rsvd1 = !cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT);
req->cmd = CPL_ABORT_SEND_RST;
log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
"csk 0x%p,%u,0x%lx,%u, snd_nxt %u, 0x%x.\n",
csk, csk->state, csk->flags, csk->tid, csk->snd_nxt,
req->rsvd1);
l2t_send(csk->cdev->lldev, skb, csk->l2t);
}
/*
* CPL connection abort reply: host ->
*
* Send an ABORT_RPL message in response of the ABORT_REQ received.
*/
static void send_abort_rpl(struct cxgbi_sock *csk, int rst_status)
{
struct sk_buff *skb = csk->cpl_abort_rpl;
struct cpl_abort_rpl *rpl = (struct cpl_abort_rpl *)skb->head;
log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
"csk 0x%p,%u,0x%lx,%u, status %d.\n",
csk, csk->state, csk->flags, csk->tid, rst_status);
csk->cpl_abort_rpl = NULL;
skb->priority = CPL_PRIORITY_DATA;
rpl->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_HOST_ABORT_CON_RPL));
rpl->wr.wr_lo = htonl(V_WR_TID(csk->tid));
OPCODE_TID(rpl) = htonl(MK_OPCODE_TID(CPL_ABORT_RPL, csk->tid));
rpl->cmd = rst_status;
cxgb3_ofld_send(csk->cdev->lldev, skb);
}
/*
* CPL connection rx data ack: host ->
* Send RX credits through an RX_DATA_ACK CPL message. Returns the number of
* credits sent.
*/
static u32 send_rx_credits(struct cxgbi_sock *csk, u32 credits)
{
struct sk_buff *skb;
struct cpl_rx_data_ack *req;
u32 dack = F_RX_DACK_CHANGE | V_RX_DACK_MODE(1);
log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
"csk 0x%p,%u,0x%lx,%u, credit %u, dack %u.\n",
csk, csk->state, csk->flags, csk->tid, credits, dack);
skb = alloc_cpl(sizeof(*req), 0, GFP_ATOMIC);
if (!skb) {
pr_info("csk 0x%p, credit %u, OOM.\n", csk, credits);
return 0;
}
req = (struct cpl_rx_data_ack *)skb->head;
req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_RX_DATA_ACK, csk->tid));
req->credit_dack = htonl(F_RX_DACK_CHANGE | V_RX_DACK_MODE(1) |
V_RX_CREDITS(credits));
skb->priority = CPL_PRIORITY_ACK;
cxgb3_ofld_send(csk->cdev->lldev, skb);
return credits;
}
/*
* CPL connection tx data: host ->
*
* Send iscsi PDU via TX_DATA CPL message. Returns the number of
* credits sent.
* Each TX_DATA consumes work request credit (wrs), so we need to keep track of
* how many we've used so far and how many are pending (i.e., yet ack'ed by T3).
*/
static unsigned int wrlen __read_mostly;
static unsigned int skb_wrs[SKB_WR_LIST_SIZE] __read_mostly;
static void init_wr_tab(unsigned int wr_len)
{
int i;
if (skb_wrs[1]) /* already initialized */
return;
for (i = 1; i < SKB_WR_LIST_SIZE; i++) {
int sgl_len = (3 * i) / 2 + (i & 1);
sgl_len += 3;
skb_wrs[i] = (sgl_len <= wr_len
? 1 : 1 + (sgl_len - 2) / (wr_len - 1));
}
wrlen = wr_len * 8;
}
static inline void make_tx_data_wr(struct cxgbi_sock *csk, struct sk_buff *skb,
int len, int req_completion)
{
struct tx_data_wr *req;
struct l2t_entry *l2t = csk->l2t;
skb_reset_transport_header(skb);
req = (struct tx_data_wr *)__skb_push(skb, sizeof(*req));
req->wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_TX_DATA) |
(req_completion ? F_WR_COMPL : 0));
req->wr_lo = htonl(V_WR_TID(csk->tid));
/* len includes the length of any HW ULP additions */
req->len = htonl(len);
/* V_TX_ULP_SUBMODE sets both the mode and submode */
req->flags = htonl(V_TX_ULP_SUBMODE(cxgbi_skcb_ulp_mode(skb)) |
V_TX_SHOVE((skb_peek(&csk->write_queue) ? 0 : 1)));
req->sndseq = htonl(csk->snd_nxt);
req->param = htonl(V_TX_PORT(l2t->smt_idx));
if (!cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT)) {
req->flags |= htonl(V_TX_ACK_PAGES(2) | F_TX_INIT |
V_TX_CPU_IDX(csk->rss_qid));
/* sendbuffer is in units of 32KB. */
req->param |= htonl(V_TX_SNDBUF(cxgb3i_snd_win >> 15));
cxgbi_sock_set_flag(csk, CTPF_TX_DATA_SENT);
}
}
/**
* push_tx_frames -- start transmit
* @c3cn: the offloaded connection
* @req_completion: request wr_ack or not
*
* Prepends TX_DATA_WR or CPL_CLOSE_CON_REQ headers to buffers waiting in a
* connection's send queue and sends them on to T3. Must be called with the
* connection's lock held. Returns the amount of send buffer space that was
* freed as a result of sending queued data to T3.
*/
static void arp_failure_skb_discard(struct t3cdev *dev, struct sk_buff *skb)
{
kfree_skb(skb);
}
static int push_tx_frames(struct cxgbi_sock *csk, int req_completion)
{
int total_size = 0;
struct sk_buff *skb;
if (unlikely(csk->state < CTP_ESTABLISHED ||
csk->state == CTP_CLOSE_WAIT_1 || csk->state >= CTP_ABORTING)) {
log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_TX,
"csk 0x%p,%u,0x%lx,%u, in closing state.\n",
csk, csk->state, csk->flags, csk->tid);
return 0;
}
while (csk->wr_cred && (skb = skb_peek(&csk->write_queue)) != NULL) {
int len = skb->len; /* length before skb_push */
int frags = skb_shinfo(skb)->nr_frags + (len != skb->data_len);
int wrs_needed = skb_wrs[frags];
if (wrs_needed > 1 && len + sizeof(struct tx_data_wr) <= wrlen)
wrs_needed = 1;
WARN_ON(frags >= SKB_WR_LIST_SIZE || wrs_needed < 1);
if (csk->wr_cred < wrs_needed) {
log_debug(1 << CXGBI_DBG_PDU_TX,
"csk 0x%p, skb len %u/%u, frag %u, wr %d<%u.\n",
csk, skb->len, skb->data_len, frags,
wrs_needed, csk->wr_cred);
break;
}
__skb_unlink(skb, &csk->write_queue);
skb->priority = CPL_PRIORITY_DATA;
skb->csum = wrs_needed; /* remember this until the WR_ACK */
csk->wr_cred -= wrs_needed;
csk->wr_una_cred += wrs_needed;
cxgbi_sock_enqueue_wr(csk, skb);
log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_TX,
"csk 0x%p, enqueue, skb len %u/%u, frag %u, wr %d, "
"left %u, unack %u.\n",
csk, skb->len, skb->data_len, frags, skb->csum,
csk->wr_cred, csk->wr_una_cred);
if (likely(cxgbi_skcb_test_flag(skb, SKCBF_TX_NEED_HDR))) {
if ((req_completion &&
csk->wr_una_cred == wrs_needed) ||
csk->wr_una_cred >= csk->wr_max_cred / 2) {
req_completion = 1;
csk->wr_una_cred = 0;
}
len += cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb));
make_tx_data_wr(csk, skb, len, req_completion);
csk->snd_nxt += len;
cxgbi_skcb_clear_flag(skb, SKCBF_TX_NEED_HDR);
}
total_size += skb->truesize;
log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_TX,
"csk 0x%p, tid 0x%x, send skb 0x%p.\n",
csk, csk->tid, skb);
set_arp_failure_handler(skb, arp_failure_skb_discard);
l2t_send(csk->cdev->lldev, skb, csk->l2t);
}
return total_size;
}
/*
* Process a CPL_ACT_ESTABLISH message: -> host
* Updates connection state from an active establish CPL message. Runs with
* the connection lock held.
*/
static inline void free_atid(struct cxgbi_sock *csk)
{
if (cxgbi_sock_flag(csk, CTPF_HAS_ATID)) {
cxgb3_free_atid(csk->cdev->lldev, csk->atid);
cxgbi_sock_clear_flag(csk, CTPF_HAS_ATID);
cxgbi_sock_put(csk);
}
}
static int do_act_establish(struct t3cdev *tdev, struct sk_buff *skb, void *ctx)
{
struct cxgbi_sock *csk = ctx;
struct cpl_act_establish *req = cplhdr(skb);
unsigned int tid = GET_TID(req);
unsigned int atid = G_PASS_OPEN_TID(ntohl(req->tos_tid));
u32 rcv_isn = ntohl(req->rcv_isn); /* real RCV_ISN + 1 */
log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
"atid 0x%x,tid 0x%x, csk 0x%p,%u,0x%lx, isn %u.\n",
atid, atid, csk, csk->state, csk->flags, rcv_isn);
cxgbi_sock_get(csk);
cxgbi_sock_set_flag(csk, CTPF_HAS_TID);
csk->tid = tid;
cxgb3_insert_tid(csk->cdev->lldev, &t3_client, csk, tid);
free_atid(csk);
csk->rss_qid = G_QNUM(ntohs(skb->csum));
spin_lock_bh(&csk->lock);
if (csk->retry_timer.function) {
del_timer(&csk->retry_timer);
csk->retry_timer.function = NULL;
}
if (unlikely(csk->state != CTP_ACTIVE_OPEN))
pr_info("csk 0x%p,%u,0x%lx,%u, got EST.\n",
csk, csk->state, csk->flags, csk->tid);
csk->copied_seq = csk->rcv_wup = csk->rcv_nxt = rcv_isn;
if (cxgb3i_rcv_win > (M_RCV_BUFSIZ << 10))
csk->rcv_wup -= cxgb3i_rcv_win - (M_RCV_BUFSIZ << 10);
cxgbi_sock_established(csk, ntohl(req->snd_isn), ntohs(req->tcp_opt));
if (unlikely(cxgbi_sock_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED)))
/* upper layer has requested closing */
send_abort_req(csk);
else {
if (skb_queue_len(&csk->write_queue))
push_tx_frames(csk, 1);
cxgbi_conn_tx_open(csk);
}
spin_unlock_bh(&csk->lock);
__kfree_skb(skb);
return 0;
}
/*
* Process a CPL_ACT_OPEN_RPL message: -> host
* Handle active open failures.
*/
static int act_open_rpl_status_to_errno(int status)
{
switch (status) {
case CPL_ERR_CONN_RESET:
return -ECONNREFUSED;
case CPL_ERR_ARP_MISS:
return -EHOSTUNREACH;
case CPL_ERR_CONN_TIMEDOUT:
return -ETIMEDOUT;
case CPL_ERR_TCAM_FULL:
return -ENOMEM;
case CPL_ERR_CONN_EXIST:
return -EADDRINUSE;
default:
return -EIO;
}
}
static void act_open_retry_timer(unsigned long data)
{
struct sk_buff *skb;
struct cxgbi_sock *csk = (struct cxgbi_sock *)data;
log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
"csk 0x%p,%u,0x%lx,%u.\n",
csk, csk->state, csk->flags, csk->tid);
cxgbi_sock_get(csk);
spin_lock_bh(&csk->lock);
skb = alloc_cpl(sizeof(struct cpl_act_open_req), 0, GFP_ATOMIC);
if (!skb)
cxgbi_sock_fail_act_open(csk, -ENOMEM);
else {
skb->sk = (struct sock *)csk;
set_arp_failure_handler(skb, act_open_arp_failure);
send_act_open_req(csk, skb, csk->l2t);
}
spin_unlock_bh(&csk->lock);
cxgbi_sock_put(csk);
}
static int do_act_open_rpl(struct t3cdev *tdev, struct sk_buff *skb, void *ctx)
{
struct cxgbi_sock *csk = ctx;
struct cpl_act_open_rpl *rpl = cplhdr(skb);
log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
"csk 0x%p,%u,0x%lx,%u, status %u.\n",
csk, csk->state, csk->flags, csk->atid, rpl->status);
if (rpl->status != CPL_ERR_TCAM_FULL &&
rpl->status != CPL_ERR_CONN_EXIST &&
rpl->status != CPL_ERR_ARP_MISS)
cxgb3_queue_tid_release(tdev, GET_TID(rpl));
cxgbi_sock_get(csk);
spin_lock_bh(&csk->lock);
if (rpl->status == CPL_ERR_CONN_EXIST &&
csk->retry_timer.function != act_open_retry_timer) {
csk->retry_timer.function = act_open_retry_timer;
mod_timer(&csk->retry_timer, jiffies + HZ / 2);
} else
cxgbi_sock_fail_act_open(csk,
act_open_rpl_status_to_errno(rpl->status));
spin_unlock_bh(&csk->lock);
cxgbi_sock_put(csk);
__kfree_skb(skb);
return 0;
}
/*
* Process PEER_CLOSE CPL messages: -> host
* Handle peer FIN.
*/
static int do_peer_close(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
{
struct cxgbi_sock *csk = ctx;
log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
"csk 0x%p,%u,0x%lx,%u.\n",
csk, csk->state, csk->flags, csk->tid);
cxgbi_sock_rcv_peer_close(csk);
__kfree_skb(skb);
return 0;
}
/*
* Process CLOSE_CONN_RPL CPL message: -> host
* Process a peer ACK to our FIN.
*/
static int do_close_con_rpl(struct t3cdev *cdev, struct sk_buff *skb,
void *ctx)
{
struct cxgbi_sock *csk = ctx;
struct cpl_close_con_rpl *rpl = cplhdr(skb);
log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
"csk 0x%p,%u,0x%lx,%u, snxt %u.\n",
csk, csk->state, csk->flags, csk->tid, ntohl(rpl->snd_nxt));
cxgbi_sock_rcv_close_conn_rpl(csk, ntohl(rpl->snd_nxt));
__kfree_skb(skb);
return 0;
}
/*
* Process ABORT_REQ_RSS CPL message: -> host
* Process abort requests. If we are waiting for an ABORT_RPL we ignore this
* request except that we need to reply to it.
*/
static int abort_status_to_errno(struct cxgbi_sock *csk, int abort_reason,
int *need_rst)
{
switch (abort_reason) {
case CPL_ERR_BAD_SYN: /* fall through */
case CPL_ERR_CONN_RESET:
return csk->state > CTP_ESTABLISHED ?
-EPIPE : -ECONNRESET;
case CPL_ERR_XMIT_TIMEDOUT:
case CPL_ERR_PERSIST_TIMEDOUT:
case CPL_ERR_FINWAIT2_TIMEDOUT:
case CPL_ERR_KEEPALIVE_TIMEDOUT:
return -ETIMEDOUT;
default:
return -EIO;
}
}
static int do_abort_req(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
{
const struct cpl_abort_req_rss *req = cplhdr(skb);
struct cxgbi_sock *csk = ctx;
int rst_status = CPL_ABORT_NO_RST;
log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
"csk 0x%p,%u,0x%lx,%u.\n",
csk, csk->state, csk->flags, csk->tid);
if (req->status == CPL_ERR_RTX_NEG_ADVICE ||
req->status == CPL_ERR_PERSIST_NEG_ADVICE) {
goto done;
}
cxgbi_sock_get(csk);
spin_lock_bh(&csk->lock);
if (!cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD)) {
cxgbi_sock_set_flag(csk, CTPF_ABORT_REQ_RCVD);
cxgbi_sock_set_state(csk, CTP_ABORTING);
goto out;
}
cxgbi_sock_clear_flag(csk, CTPF_ABORT_REQ_RCVD);
send_abort_rpl(csk, rst_status);
if (!cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
csk->err = abort_status_to_errno(csk, req->status, &rst_status);
cxgbi_sock_closed(csk);
}
out:
spin_unlock_bh(&csk->lock);
cxgbi_sock_put(csk);
done:
__kfree_skb(skb);
return 0;
}
/*
* Process ABORT_RPL_RSS CPL message: -> host
* Process abort replies. We only process these messages if we anticipate
* them as the coordination between SW and HW in this area is somewhat lacking
* and sometimes we get ABORT_RPLs after we are done with the connection that
* originated the ABORT_REQ.
*/
static int do_abort_rpl(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
{
struct cpl_abort_rpl_rss *rpl = cplhdr(skb);
struct cxgbi_sock *csk = ctx;
log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
"status 0x%x, csk 0x%p, s %u, 0x%lx.\n",
rpl->status, csk, csk ? csk->state : 0,
csk ? csk->flags : 0UL);
/*
* Ignore replies to post-close aborts indicating that the abort was
* requested too late. These connections are terminated when we get
* PEER_CLOSE or CLOSE_CON_RPL and by the time the abort_rpl_rss
* arrives the TID is either no longer used or it has been recycled.
*/
if (rpl->status == CPL_ERR_ABORT_FAILED)
goto rel_skb;
/*
* Sometimes we've already closed the connection, e.g., a post-close
* abort races with ABORT_REQ_RSS, the latter frees the connection
* expecting the ABORT_REQ will fail with CPL_ERR_ABORT_FAILED,
* but FW turns the ABORT_REQ into a regular one and so we get
* ABORT_RPL_RSS with status 0 and no connection.
*/
if (csk)
cxgbi_sock_rcv_abort_rpl(csk);
rel_skb:
__kfree_skb(skb);
return 0;
}
/*
* Process RX_ISCSI_HDR CPL message: -> host
* Handle received PDUs, the payload could be DDP'ed. If not, the payload
* follow after the bhs.
*/
static int do_iscsi_hdr(struct t3cdev *t3dev, struct sk_buff *skb, void *ctx)
{
struct cxgbi_sock *csk = ctx;
struct cpl_iscsi_hdr *hdr_cpl = cplhdr(skb);
struct cpl_iscsi_hdr_norss data_cpl;
struct cpl_rx_data_ddp_norss ddp_cpl;
unsigned int hdr_len, data_len, status;
unsigned int len;
int err;
log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
"csk 0x%p,%u,0x%lx,%u, skb 0x%p,%u.\n",
csk, csk->state, csk->flags, csk->tid, skb, skb->len);
spin_lock_bh(&csk->lock);
if (unlikely(csk->state >= CTP_PASSIVE_CLOSE)) {
log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
"csk 0x%p,%u,0x%lx,%u, bad state.\n",
csk, csk->state, csk->flags, csk->tid);
if (csk->state != CTP_ABORTING)
goto abort_conn;
else
goto discard;
}
cxgbi_skcb_tcp_seq(skb) = ntohl(hdr_cpl->seq);
cxgbi_skcb_flags(skb) = 0;
skb_reset_transport_header(skb);
__skb_pull(skb, sizeof(struct cpl_iscsi_hdr));
len = hdr_len = ntohs(hdr_cpl->len);
/* msg coalesce is off or not enough data received */
if (skb->len <= hdr_len) {
pr_err("%s: tid %u, CPL_ISCSI_HDR, skb len %u < %u.\n",
csk->cdev->ports[csk->port_id]->name, csk->tid,
skb->len, hdr_len);
goto abort_conn;
}
cxgbi_skcb_set_flag(skb, SKCBF_RX_COALESCED);
err = skb_copy_bits(skb, skb->len - sizeof(ddp_cpl), &ddp_cpl,
sizeof(ddp_cpl));
if (err < 0) {
pr_err("%s: tid %u, copy cpl_ddp %u-%zu failed %d.\n",
csk->cdev->ports[csk->port_id]->name, csk->tid,
skb->len, sizeof(ddp_cpl), err);
goto abort_conn;
}
cxgbi_skcb_set_flag(skb, SKCBF_RX_STATUS);
cxgbi_skcb_rx_pdulen(skb) = ntohs(ddp_cpl.len);
cxgbi_skcb_rx_ddigest(skb) = ntohl(ddp_cpl.ulp_crc);
status = ntohl(ddp_cpl.ddp_status);
log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
"csk 0x%p, skb 0x%p,%u, pdulen %u, status 0x%x.\n",
csk, skb, skb->len, cxgbi_skcb_rx_pdulen(skb), status);
if (status & (1 << CPL_RX_DDP_STATUS_HCRC_SHIFT))
cxgbi_skcb_set_flag(skb, SKCBF_RX_HCRC_ERR);
if (status & (1 << CPL_RX_DDP_STATUS_DCRC_SHIFT))
cxgbi_skcb_set_flag(skb, SKCBF_RX_DCRC_ERR);
if (status & (1 << CPL_RX_DDP_STATUS_PAD_SHIFT))
cxgbi_skcb_set_flag(skb, SKCBF_RX_PAD_ERR);
if (skb->len > (hdr_len + sizeof(ddp_cpl))) {
err = skb_copy_bits(skb, hdr_len, &data_cpl, sizeof(data_cpl));
if (err < 0) {
pr_err("%s: tid %u, cp %zu/%u failed %d.\n",
csk->cdev->ports[csk->port_id]->name,
csk->tid, sizeof(data_cpl), skb->len, err);
goto abort_conn;
}
data_len = ntohs(data_cpl.len);
log_debug(1 << CXGBI_DBG_DDP | 1 << CXGBI_DBG_PDU_RX,
"skb 0x%p, pdu not ddp'ed %u/%u, status 0x%x.\n",
skb, data_len, cxgbi_skcb_rx_pdulen(skb), status);
len += sizeof(data_cpl) + data_len;
} else if (status & (1 << CPL_RX_DDP_STATUS_DDP_SHIFT))
cxgbi_skcb_set_flag(skb, SKCBF_RX_DATA_DDPD);
csk->rcv_nxt = ntohl(ddp_cpl.seq) + cxgbi_skcb_rx_pdulen(skb);
__pskb_trim(skb, len);
__skb_queue_tail(&csk->receive_queue, skb);
cxgbi_conn_pdu_ready(csk);
spin_unlock_bh(&csk->lock);
return 0;
abort_conn:
send_abort_req(csk);
discard:
spin_unlock_bh(&csk->lock);
__kfree_skb(skb);
return 0;
}
/*
* Process TX_DATA_ACK CPL messages: -> host
* Process an acknowledgment of WR completion. Advance snd_una and send the
* next batch of work requests from the write queue.
*/
static int do_wr_ack(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
{
struct cxgbi_sock *csk = ctx;
struct cpl_wr_ack *hdr = cplhdr(skb);
log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
"csk 0x%p,%u,0x%lx,%u, cr %u.\n",
csk, csk->state, csk->flags, csk->tid, ntohs(hdr->credits));
cxgbi_sock_rcv_wr_ack(csk, ntohs(hdr->credits), ntohl(hdr->snd_una), 1);
__kfree_skb(skb);
return 0;
}
/*
* for each connection, pre-allocate skbs needed for close/abort requests. So
* that we can service the request right away.
*/
static int alloc_cpls(struct cxgbi_sock *csk)
{
csk->cpl_close = alloc_cpl(sizeof(struct cpl_close_con_req), 0,
GFP_KERNEL);
if (!csk->cpl_close)
return -ENOMEM;
csk->cpl_abort_req = alloc_cpl(sizeof(struct cpl_abort_req), 0,
GFP_KERNEL);
if (!csk->cpl_abort_req)
goto free_cpl_skbs;
csk->cpl_abort_rpl = alloc_cpl(sizeof(struct cpl_abort_rpl), 0,
GFP_KERNEL);
if (!csk->cpl_abort_rpl)
goto free_cpl_skbs;
return 0;
free_cpl_skbs:
cxgbi_sock_free_cpl_skbs(csk);
return -ENOMEM;
}
/**
* release_offload_resources - release offload resource
* @c3cn: the offloaded iscsi tcp connection.
* Release resources held by an offload connection (TID, L2T entry, etc.)
*/
static void l2t_put(struct cxgbi_sock *csk)
{
struct t3cdev *t3dev = (struct t3cdev *)csk->cdev->lldev;
if (csk->l2t) {
l2t_release(L2DATA(t3dev), csk->l2t);
csk->l2t = NULL;
cxgbi_sock_put(csk);
}
}
static void release_offload_resources(struct cxgbi_sock *csk)
{
struct t3cdev *t3dev = (struct t3cdev *)csk->cdev->lldev;
log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
"csk 0x%p,%u,0x%lx,%u.\n",
csk, csk->state, csk->flags, csk->tid);
csk->rss_qid = 0;
cxgbi_sock_free_cpl_skbs(csk);
if (csk->wr_cred != csk->wr_max_cred) {
cxgbi_sock_purge_wr_queue(csk);
cxgbi_sock_reset_wr_list(csk);
}
l2t_put(csk);
if (cxgbi_sock_flag(csk, CTPF_HAS_ATID))
free_atid(csk);
else if (cxgbi_sock_flag(csk, CTPF_HAS_TID)) {
cxgb3_remove_tid(t3dev, (void *)csk, csk->tid);
cxgbi_sock_clear_flag(csk, CTPF_HAS_TID);
cxgbi_sock_put(csk);
}
csk->dst = NULL;
csk->cdev = NULL;
}
static int init_act_open(struct cxgbi_sock *csk)
{
struct dst_entry *dst = csk->dst;
struct cxgbi_device *cdev = csk->cdev;
struct t3cdev *t3dev = (struct t3cdev *)cdev->lldev;
struct net_device *ndev = cdev->ports[csk->port_id];
struct sk_buff *skb = NULL;
log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
"csk 0x%p,%u,0x%lx.\n", csk, csk->state, csk->flags);
csk->rss_qid = 0;
csk->l2t = t3_l2t_get(t3dev, dst->neighbour, ndev);
if (!csk->l2t) {
pr_err("NO l2t available.\n");
return -EINVAL;
}
cxgbi_sock_get(csk);
csk->atid = cxgb3_alloc_atid(t3dev, &t3_client, csk);
if (csk->atid < 0) {
pr_err("NO atid available.\n");
goto rel_resource;
}
cxgbi_sock_set_flag(csk, CTPF_HAS_ATID);
cxgbi_sock_get(csk);
skb = alloc_cpl(sizeof(struct cpl_act_open_req), 0, GFP_KERNEL);
if (!skb)
goto rel_resource;
skb->sk = (struct sock *)csk;
set_arp_failure_handler(skb, act_open_arp_failure);
csk->wr_max_cred = csk->wr_cred = T3C_DATA(t3dev)->max_wrs - 1;
csk->wr_una_cred = 0;
csk->mss_idx = cxgbi_sock_select_mss(csk, dst_mtu(dst));
cxgbi_sock_reset_wr_list(csk);
csk->err = 0;
cxgbi_sock_set_state(csk, CTP_ACTIVE_OPEN);
send_act_open_req(csk, skb, csk->l2t);
return 0;
rel_resource:
if (skb)
__kfree_skb(skb);
return -EINVAL;
}
cxgb3_cpl_handler_func cxgb3i_cpl_handlers[NUM_CPL_CMDS] = {
[CPL_ACT_ESTABLISH] = do_act_establish,
[CPL_ACT_OPEN_RPL] = do_act_open_rpl,
[CPL_PEER_CLOSE] = do_peer_close,
[CPL_ABORT_REQ_RSS] = do_abort_req,
[CPL_ABORT_RPL_RSS] = do_abort_rpl,
[CPL_CLOSE_CON_RPL] = do_close_con_rpl,
[CPL_TX_DMA_ACK] = do_wr_ack,
[CPL_ISCSI_HDR] = do_iscsi_hdr,
};
/**
* cxgb3i_ofld_init - allocate and initialize resources for each adapter found
* @cdev: cxgbi adapter
*/
int cxgb3i_ofld_init(struct cxgbi_device *cdev)
{
struct t3cdev *t3dev = (struct t3cdev *)cdev->lldev;
struct adap_ports port;
struct ofld_page_info rx_page_info;
unsigned int wr_len;
int rc;
if (t3dev->ctl(t3dev, GET_WR_LEN, &wr_len) < 0 ||
t3dev->ctl(t3dev, GET_PORTS, &port) < 0 ||
t3dev->ctl(t3dev, GET_RX_PAGE_INFO, &rx_page_info) < 0) {
pr_warn("t3 0x%p, offload up, ioctl failed.\n", t3dev);
return -EINVAL;
}
if (cxgb3i_max_connect > CXGBI_MAX_CONN)
cxgb3i_max_connect = CXGBI_MAX_CONN;
rc = cxgbi_device_portmap_create(cdev, cxgb3i_sport_base,
cxgb3i_max_connect);
if (rc < 0)
return rc;
init_wr_tab(wr_len);
cdev->csk_release_offload_resources = release_offload_resources;
cdev->csk_push_tx_frames = push_tx_frames;
cdev->csk_send_abort_req = send_abort_req;
cdev->csk_send_close_req = send_close_req;
cdev->csk_send_rx_credits = send_rx_credits;
cdev->csk_alloc_cpls = alloc_cpls;
cdev->csk_init_act_open = init_act_open;
pr_info("cdev 0x%p, offload up, added.\n", cdev);
return 0;
}
/*
* functions to program the pagepod in h/w
*/
static inline void ulp_mem_io_set_hdr(struct sk_buff *skb, unsigned int addr)
{
struct ulp_mem_io *req = (struct ulp_mem_io *)skb->head;
memset(req, 0, sizeof(*req));
req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_BYPASS));
req->cmd_lock_addr = htonl(V_ULP_MEMIO_ADDR(addr >> 5) |
V_ULPTX_CMD(ULP_MEM_WRITE));
req->len = htonl(V_ULP_MEMIO_DATA_LEN(PPOD_SIZE >> 5) |
V_ULPTX_NFLITS((PPOD_SIZE >> 3) + 1));
}
static int ddp_set_map(struct cxgbi_sock *csk, struct cxgbi_pagepod_hdr *hdr,
unsigned int idx, unsigned int npods,
struct cxgbi_gather_list *gl)
{
struct cxgbi_device *cdev = csk->cdev;
struct cxgbi_ddp_info *ddp = cdev->ddp;
unsigned int pm_addr = (idx << PPOD_SIZE_SHIFT) + ddp->llimit;
int i;
log_debug(1 << CXGBI_DBG_DDP,
"csk 0x%p, idx %u, npods %u, gl 0x%p.\n",
csk, idx, npods, gl);
for (i = 0; i < npods; i++, idx++, pm_addr += PPOD_SIZE) {
struct sk_buff *skb = ddp->gl_skb[idx];
/* hold on to the skb until we clear the ddp mapping */
skb_get(skb);
ulp_mem_io_set_hdr(skb, pm_addr);
cxgbi_ddp_ppod_set((struct cxgbi_pagepod *)(skb->head +
sizeof(struct ulp_mem_io)),
hdr, gl, i * PPOD_PAGES_MAX);
skb->priority = CPL_PRIORITY_CONTROL;
cxgb3_ofld_send(cdev->lldev, skb);
}
return 0;
}
static void ddp_clear_map(struct cxgbi_hba *chba, unsigned int tag,
unsigned int idx, unsigned int npods)
{
struct cxgbi_device *cdev = chba->cdev;
struct cxgbi_ddp_info *ddp = cdev->ddp;
unsigned int pm_addr = (idx << PPOD_SIZE_SHIFT) + ddp->llimit;
int i;
log_debug(1 << CXGBI_DBG_DDP,
"cdev 0x%p, idx %u, npods %u, tag 0x%x.\n",
cdev, idx, npods, tag);
for (i = 0; i < npods; i++, idx++, pm_addr += PPOD_SIZE) {
struct sk_buff *skb = ddp->gl_skb[idx];
if (!skb) {
pr_err("tag 0x%x, 0x%x, %d/%u, skb NULL.\n",
tag, idx, i, npods);
continue;
}
ddp->gl_skb[idx] = NULL;
memset(skb->head + sizeof(struct ulp_mem_io), 0, PPOD_SIZE);
ulp_mem_io_set_hdr(skb, pm_addr);
skb->priority = CPL_PRIORITY_CONTROL;
cxgb3_ofld_send(cdev->lldev, skb);
}
}
static void ddp_free_gl_skb(struct cxgbi_ddp_info *ddp, int idx, int cnt)
{
int i;
log_debug(1 << CXGBI_DBG_DDP,
"ddp 0x%p, idx %d, cnt %d.\n", ddp, idx, cnt);
for (i = 0; i < cnt; i++, idx++)
if (ddp->gl_skb[idx]) {
kfree_skb(ddp->gl_skb[idx]);
ddp->gl_skb[idx] = NULL;
}
}
static int ddp_alloc_gl_skb(struct cxgbi_ddp_info *ddp, int idx,
int cnt, gfp_t gfp)
{
int i;
log_debug(1 << CXGBI_DBG_DDP,
"ddp 0x%p, idx %d, cnt %d.\n", ddp, idx, cnt);
for (i = 0; i < cnt; i++) {
struct sk_buff *skb = alloc_cpl(sizeof(struct ulp_mem_io) +
PPOD_SIZE, 0, gfp);
if (skb) {
ddp->gl_skb[idx + i] = skb;
} else {
ddp_free_gl_skb(ddp, idx, i);
return -ENOMEM;
}
}
return 0;
}
static int ddp_setup_conn_pgidx(struct cxgbi_sock *csk,
unsigned int tid, int pg_idx, bool reply)
{
struct sk_buff *skb = alloc_cpl(sizeof(struct cpl_set_tcb_field), 0,
GFP_KERNEL);
struct cpl_set_tcb_field *req;
u64 val = pg_idx < DDP_PGIDX_MAX ? pg_idx : 0;
log_debug(1 << CXGBI_DBG_DDP,
"csk 0x%p, tid %u, pg_idx %d.\n", csk, tid, pg_idx);
if (!skb)
return -ENOMEM;
/* set up ulp submode and page size */
req = (struct cpl_set_tcb_field *)skb->head;
req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, tid));
req->reply = V_NO_REPLY(reply ? 0 : 1);
req->cpu_idx = 0;
req->word = htons(31);
req->mask = cpu_to_be64(0xF0000000);
req->val = cpu_to_be64(val << 28);
skb->priority = CPL_PRIORITY_CONTROL;
cxgb3_ofld_send(csk->cdev->lldev, skb);
return 0;
}
/**
* cxgb3i_setup_conn_digest - setup conn. digest setting
* @csk: cxgb tcp socket
* @tid: connection id
* @hcrc: header digest enabled
* @dcrc: data digest enabled
* @reply: request reply from h/w
* set up the iscsi digest settings for a connection identified by tid
*/
static int ddp_setup_conn_digest(struct cxgbi_sock *csk, unsigned int tid,
int hcrc, int dcrc, int reply)
{
struct sk_buff *skb = alloc_cpl(sizeof(struct cpl_set_tcb_field), 0,
GFP_KERNEL);
struct cpl_set_tcb_field *req;
u64 val = (hcrc ? 1 : 0) | (dcrc ? 2 : 0);
log_debug(1 << CXGBI_DBG_DDP,
"csk 0x%p, tid %u, crc %d,%d.\n", csk, tid, hcrc, dcrc);
if (!skb)
return -ENOMEM;
/* set up ulp submode and page size */
req = (struct cpl_set_tcb_field *)skb->head;
req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, tid));
req->reply = V_NO_REPLY(reply ? 0 : 1);
req->cpu_idx = 0;
req->word = htons(31);
req->mask = cpu_to_be64(0x0F000000);
req->val = cpu_to_be64(val << 24);
skb->priority = CPL_PRIORITY_CONTROL;
cxgb3_ofld_send(csk->cdev->lldev, skb);
return 0;
}
/**
* t3_ddp_cleanup - release the cxgb3 adapter's ddp resource
* @cdev: cxgb3i adapter
* release all the resource held by the ddp pagepod manager for a given
* adapter if needed
*/
static void t3_ddp_cleanup(struct cxgbi_device *cdev)
{
struct t3cdev *tdev = (struct t3cdev *)cdev->lldev;
if (cxgbi_ddp_cleanup(cdev)) {
pr_info("t3dev 0x%p, ulp_iscsi no more user.\n", tdev);
tdev->ulp_iscsi = NULL;
}
}
/**
* ddp_init - initialize the cxgb3 adapter's ddp resource
* @cdev: cxgb3i adapter
* initialize the ddp pagepod manager for a given adapter
*/
static int cxgb3i_ddp_init(struct cxgbi_device *cdev)
{
struct t3cdev *tdev = (struct t3cdev *)cdev->lldev;
struct cxgbi_ddp_info *ddp = tdev->ulp_iscsi;
struct ulp_iscsi_info uinfo;
unsigned int pgsz_factor[4];
int err;
if (ddp) {
kref_get(&ddp->refcnt);
pr_warn("t3dev 0x%p, ddp 0x%p already set up.\n",
tdev, tdev->ulp_iscsi);
cdev->ddp = ddp;
return -EALREADY;
}
err = tdev->ctl(tdev, ULP_ISCSI_GET_PARAMS, &uinfo);
if (err < 0) {
pr_err("%s, failed to get iscsi param err=%d.\n",
tdev->name, err);
return err;
}
err = cxgbi_ddp_init(cdev, uinfo.llimit, uinfo.ulimit,
uinfo.max_txsz, uinfo.max_rxsz);
if (err < 0)
return err;
ddp = cdev->ddp;
uinfo.tagmask = ddp->idx_mask << PPOD_IDX_SHIFT;
cxgbi_ddp_page_size_factor(pgsz_factor);
uinfo.ulimit = uinfo.llimit + (ddp->nppods << PPOD_SIZE_SHIFT);
err = tdev->ctl(tdev, ULP_ISCSI_SET_PARAMS, &uinfo);
if (err < 0) {
pr_warn("%s unable to set iscsi param err=%d, ddp disabled.\n",
tdev->name, err);
cxgbi_ddp_cleanup(cdev);
return err;
}
tdev->ulp_iscsi = ddp;
cdev->csk_ddp_free_gl_skb = ddp_free_gl_skb;
cdev->csk_ddp_alloc_gl_skb = ddp_alloc_gl_skb;
cdev->csk_ddp_setup_digest = ddp_setup_conn_digest;
cdev->csk_ddp_setup_pgidx = ddp_setup_conn_pgidx;
cdev->csk_ddp_set = ddp_set_map;
cdev->csk_ddp_clear = ddp_clear_map;
pr_info("tdev 0x%p, nppods %u, bits %u, mask 0x%x,0x%x pkt %u/%u, "
"%u/%u.\n",
tdev, ddp->nppods, ddp->idx_bits, ddp->idx_mask,
ddp->rsvd_tag_mask, ddp->max_txsz, uinfo.max_txsz,
ddp->max_rxsz, uinfo.max_rxsz);
return 0;
}
static void cxgb3i_dev_close(struct t3cdev *t3dev)
{
struct cxgbi_device *cdev = cxgbi_device_find_by_lldev(t3dev);
if (!cdev || cdev->flags & CXGBI_FLAG_ADAPTER_RESET) {
pr_info("0x%p close, f 0x%x.\n", cdev, cdev ? cdev->flags : 0);
return;
}
cxgbi_device_unregister(cdev);
}
/**
* cxgb3i_dev_open - init a t3 adapter structure and any h/w settings
* @t3dev: t3cdev adapter
*/
static void cxgb3i_dev_open(struct t3cdev *t3dev)
{
struct cxgbi_device *cdev = cxgbi_device_find_by_lldev(t3dev);
struct adapter *adapter = tdev2adap(t3dev);
int i, err;
if (cdev) {
pr_info("0x%p, updating.\n", cdev);
return;
}
cdev = cxgbi_device_register(0, adapter->params.nports);
if (!cdev) {
pr_warn("device 0x%p register failed.\n", t3dev);
return;
}
cdev->flags = CXGBI_FLAG_DEV_T3 | CXGBI_FLAG_IPV4_SET;
cdev->lldev = t3dev;
cdev->pdev = adapter->pdev;
cdev->ports = adapter->port;
cdev->nports = adapter->params.nports;
cdev->mtus = adapter->params.mtus;
cdev->nmtus = NMTUS;
cdev->snd_win = cxgb3i_snd_win;
cdev->rcv_win = cxgb3i_rcv_win;
cdev->rx_credit_thres = cxgb3i_rx_credit_thres;
cdev->skb_tx_rsvd = CXGB3I_TX_HEADER_LEN;
cdev->skb_rx_extra = sizeof(struct cpl_iscsi_hdr_norss);
cdev->dev_ddp_cleanup = t3_ddp_cleanup;
cdev->itp = &cxgb3i_iscsi_transport;
err = cxgb3i_ddp_init(cdev);
if (err) {
pr_info("0x%p ddp init failed\n", cdev);
goto err_out;
}
err = cxgb3i_ofld_init(cdev);
if (err) {
pr_info("0x%p offload init failed\n", cdev);
goto err_out;
}
err = cxgbi_hbas_add(cdev, CXGB3I_MAX_LUN, CXGBI_MAX_CONN,
&cxgb3i_host_template, cxgb3i_stt);
if (err)
goto err_out;
for (i = 0; i < cdev->nports; i++)
cdev->hbas[i]->ipv4addr =
cxgb3i_get_private_ipv4addr(cdev->ports[i]);
pr_info("cdev 0x%p, f 0x%x, t3dev 0x%p open, err %d.\n",
cdev, cdev ? cdev->flags : 0, t3dev, err);
return;
err_out:
cxgbi_device_unregister(cdev);
}
static void cxgb3i_dev_event_handler(struct t3cdev *t3dev, u32 event, u32 port)
{
struct cxgbi_device *cdev = cxgbi_device_find_by_lldev(t3dev);
log_debug(1 << CXGBI_DBG_TOE,
"0x%p, cdev 0x%p, event 0x%x, port 0x%x.\n",
t3dev, cdev, event, port);
if (!cdev)
return;
switch (event) {
case OFFLOAD_STATUS_DOWN:
cdev->flags |= CXGBI_FLAG_ADAPTER_RESET;
break;
case OFFLOAD_STATUS_UP:
cdev->flags &= ~CXGBI_FLAG_ADAPTER_RESET;
break;
}
}
/**
* cxgb3i_init_module - module init entry point
*
* initialize any driver wide global data structures and register itself
* with the cxgb3 module
*/
static int __init cxgb3i_init_module(void)
{
int rc;
printk(KERN_INFO "%s", version);
rc = cxgbi_iscsi_init(&cxgb3i_iscsi_transport, &cxgb3i_stt);
if (rc < 0)
return rc;
cxgb3_register_client(&t3_client);
return 0;
}
/**
* cxgb3i_exit_module - module cleanup/exit entry point
*
* go through the driver hba list and for each hba, release any resource held.
* and unregisters iscsi transport and the cxgb3 module
*/
static void __exit cxgb3i_exit_module(void)
{
cxgb3_unregister_client(&t3_client);
cxgbi_device_unregister_all(CXGBI_FLAG_DEV_T3);
cxgbi_iscsi_cleanup(&cxgb3i_iscsi_transport, &cxgb3i_stt);
}
module_init(cxgb3i_init_module);
module_exit(cxgb3i_exit_module);
drivers/scsi/cxgb3i/cxgb3i_pdu.h → drivers/scsi/cxgbi/cxgb3i/cxgb3i.h
View file @ 6f7efaab
/*
* cxgb3i_ulp2.h: Chelsio S3xx iSCSI driver.
* cxgb3i.h: Chelsio S3xx iSCSI driver.
*
* Copyright (c) 2008 Chelsio Communications, Inc.
*
......@@ -10,8 +10,24 @@
* Written by: Karen Xie (kxie@chelsio.com)
*/
#ifndef __CXGB3I_ULP2_PDU_H__
#define __CXGB3I_ULP2_PDU_H__
#ifndef __CXGB3I_H__
#define __CXGB3I_H__
#define CXGB3I_SCSI_HOST_QDEPTH 1024
#define CXGB3I_MAX_LUN 512
#define ISCSI_PDU_NONPAYLOAD_MAX \
(sizeof(struct iscsi_hdr) + ISCSI_MAX_AHS_SIZE + 2*ISCSI_DIGEST_SIZE)
/*for TX: a skb must have a headroom of at least TX_HEADER_LEN bytes */
#define CXGB3I_TX_HEADER_LEN \
(sizeof(struct tx_data_wr) + sizeof(struct sge_opaque_hdr))
extern cxgb3_cpl_handler_func cxgb3i_cpl_handlers[NUM_CPL_CMDS];
#define cxgb3i_get_private_ipv4addr(ndev) \
(((struct port_info *)(netdev_priv(ndev)))->iscsi_ipv4addr)
#define cxgb3i_set_private_ipv4addr(ndev, addr) \
(((struct port_info *)(netdev_priv(ndev)))->iscsi_ipv4addr) = addr
struct cpl_iscsi_hdr_norss {
union opcode_tid ot;
......@@ -32,28 +48,4 @@ struct cpl_rx_data_ddp_norss {
u32 ulp_crc;
u32 ddp_status;
};
#define RX_DDP_STATUS_IPP_SHIFT 27 /* invalid pagepod */
#define RX_DDP_STATUS_TID_SHIFT 26 /* tid mismatch */
#define RX_DDP_STATUS_COLOR_SHIFT 25 /* color mismatch */
#define RX_DDP_STATUS_OFFSET_SHIFT 24 /* offset mismatch */
#define RX_DDP_STATUS_ULIMIT_SHIFT 23 /* ulimit error */
#define RX_DDP_STATUS_TAG_SHIFT 22 /* tag mismatch */
#define RX_DDP_STATUS_DCRC_SHIFT 21 /* dcrc error */
#define RX_DDP_STATUS_HCRC_SHIFT 20 /* hcrc error */
#define RX_DDP_STATUS_PAD_SHIFT 19 /* pad error */
#define RX_DDP_STATUS_PPP_SHIFT 18 /* pagepod parity error */
#define RX_DDP_STATUS_LLIMIT_SHIFT 17 /* llimit error */
#define RX_DDP_STATUS_DDP_SHIFT 16 /* ddp'able */
#define RX_DDP_STATUS_PMM_SHIFT 15 /* pagepod mismatch */
#define ULP2_FLAG_DATA_READY 0x1
#define ULP2_FLAG_DATA_DDPED 0x2
#define ULP2_FLAG_HCRC_ERROR 0x10
#define ULP2_FLAG_DCRC_ERROR 0x20
#define ULP2_FLAG_PAD_ERROR 0x40
void cxgb3i_conn_closing(struct s3_conn *c3cn);
void cxgb3i_conn_pdu_ready(struct s3_conn *c3cn);
void cxgb3i_conn_tx_open(struct s3_conn *c3cn);
#endif
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