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Commit 32a675ed authored by Arnd Bergmann's avatar Arnd Bergmann
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net: tile: remove ethernet drivers 

The tile architecture is obsolete and getting removed. From all
I can tell, later ARM based products use a different ethernet driver,
so we should remove this one as well.
Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
parent 0833f763
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drivers/net/ethernet/Kconfig
View file @ 32a675ed
......@@ -176,7 +176,6 @@ source "drivers/net/ethernet/stmicro/Kconfig"
source "drivers/net/ethernet/sun/Kconfig"
source "drivers/net/ethernet/tehuti/Kconfig"
source "drivers/net/ethernet/ti/Kconfig"
source "drivers/net/ethernet/tile/Kconfig"
source "drivers/net/ethernet/toshiba/Kconfig"
source "drivers/net/ethernet/tundra/Kconfig"
source "drivers/net/ethernet/via/Kconfig"
......
drivers/net/ethernet/Makefile
View file @ 32a675ed
......@@ -88,7 +88,6 @@ obj-$(CONFIG_NET_VENDOR_STMICRO) += stmicro/
obj-$(CONFIG_NET_VENDOR_SUN) += sun/
obj-$(CONFIG_NET_VENDOR_TEHUTI) += tehuti/
obj-$(CONFIG_NET_VENDOR_TI) += ti/
obj-$(CONFIG_TILE_NET) += tile/
obj-$(CONFIG_NET_VENDOR_TOSHIBA) += toshiba/
obj-$(CONFIG_NET_VENDOR_TUNDRA) += tundra/
obj-$(CONFIG_NET_VENDOR_VIA) += via/
......
drivers/net/ethernet/tile/Kconfig deleted 100644 → 0
View file @ 0833f763
#
# Tilera network device configuration
#
config TILE_NET
tristate "Tilera GBE/XGBE network driver support"
depends on TILE
default y
select CRC32
select TILE_GXIO_MPIPE if TILEGX
select HIGH_RES_TIMERS if TILEGX
imply PTP_1588_CLOCK if TILEGX
---help---
This is a standard Linux network device driver for the
on-chip Tilera Gigabit Ethernet and XAUI interfaces.
To compile this driver as a module, choose M here: the module
will be called tile_net.
drivers/net/ethernet/tile/Makefile deleted 100644 → 0
View file @ 0833f763
# SPDX-License-Identifier: GPL-2.0
#
# Makefile for the TILE on-chip networking support.
#
obj-$(CONFIG_TILE_NET) += tile_net.o
ifdef CONFIG_TILEGX
tile_net-y := tilegx.o
else
tile_net-y := tilepro.o
endif
drivers/net/ethernet/tile/tilegx.c deleted 100644 → 0
View file @ 0833f763
/*
* Copyright 2012 Tilera Corporation. 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, version 2.
*
* 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, GOOD TITLE or
* NON INFRINGEMENT. See the GNU General Public License for
* more details.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/moduleparam.h>
#include <linux/sched.h>
#include <linux/kernel.h> /* printk() */
#include <linux/slab.h> /* kmalloc() */
#include <linux/errno.h> /* error codes */
#include <linux/types.h> /* size_t */
#include <linux/interrupt.h>
#include <linux/in.h>
#include <linux/irq.h>
#include <linux/netdevice.h> /* struct device, and other headers */
#include <linux/etherdevice.h> /* eth_type_trans */
#include <linux/skbuff.h>
#include <linux/ioctl.h>
#include <linux/cdev.h>
#include <linux/hugetlb.h>
#include <linux/in6.h>
#include <linux/timer.h>
#include <linux/hrtimer.h>
#include <linux/ktime.h>
#include <linux/io.h>
#include <linux/ctype.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/tcp.h>
#include <linux/net_tstamp.h>
#include <linux/ptp_clock_kernel.h>
#include <linux/sched/isolation.h>
#include <asm/checksum.h>
#include <asm/homecache.h>
#include <gxio/mpipe.h>
#include <arch/sim.h>
/* Default transmit lockup timeout period, in jiffies. */
#define TILE_NET_TIMEOUT (5 * HZ)
/* The maximum number of distinct channels (idesc.channel is 5 bits). */
#define TILE_NET_CHANNELS 32
/* Maximum number of idescs to handle per "poll". */
#define TILE_NET_BATCH 128
/* Maximum number of packets to handle per "poll". */
#define TILE_NET_WEIGHT 64
/* Maximum Jumbo Packet MTU */
#define TILE_JUMBO_MAX_MTU 9000
/* Number of entries in each iqueue. */
#define IQUEUE_ENTRIES 512
/* Number of entries in each equeue. */
#define EQUEUE_ENTRIES 2048
/* Total header bytes per equeue slot. Must be big enough for 2 bytes
* of NET_IP_ALIGN alignment, plus 14 bytes (?) of L2 header, plus up to
* 60 bytes of actual TCP header. We round up to align to cache lines.
*/
#define HEADER_BYTES 128
/* Maximum completions per cpu per device (must be a power of two).
* ISSUE: What is the right number here? If this is too small, then
* egress might block waiting for free space in a completions array.
* ISSUE: At the least, allocate these only for initialized echannels.
*/
#define TILE_NET_MAX_COMPS 64
#define MAX_FRAGS (MAX_SKB_FRAGS + 1)
/* The "kinds" of buffer stacks (small/large/jumbo). */
#define MAX_KINDS 3
/* Size of completions data to allocate.
* ISSUE: Probably more than needed since we don't use all the channels.
*/
#define COMPS_SIZE (TILE_NET_CHANNELS * sizeof(struct tile_net_comps))
/* Size of NotifRing data to allocate. */
#define NOTIF_RING_SIZE (IQUEUE_ENTRIES * sizeof(gxio_mpipe_idesc_t))
/* Timeout to wake the per-device TX timer after we stop the queue.
* We don't want the timeout too short (adds overhead, and might end
* up causing stop/wake/stop/wake cycles) or too long (affects performance).
* For the 10 Gb NIC, 30 usec means roughly 30+ 1500-byte packets.
*/
#define TX_TIMER_DELAY_USEC 30
/* Timeout to wake the per-cpu egress timer to free completions. */
#define EGRESS_TIMER_DELAY_USEC 1000
MODULE_AUTHOR("Tilera Corporation");
MODULE_LICENSE("GPL");
/* A "packet fragment" (a chunk of memory). */
struct frag {
void *buf;
size_t length;
};
/* A single completion. */
struct tile_net_comp {
/* The "complete_count" when the completion will be complete. */
s64 when;
/* The buffer to be freed when the completion is complete. */
struct sk_buff *skb;
};
/* The completions for a given cpu and echannel. */
struct tile_net_comps {
/* The completions. */
struct tile_net_comp comp_queue[TILE_NET_MAX_COMPS];
/* The number of completions used. */
unsigned long comp_next;
/* The number of completions freed. */
unsigned long comp_last;
};
/* The transmit wake timer for a given cpu and echannel. */
struct tile_net_tx_wake {
int tx_queue_idx;
struct hrtimer timer;
struct net_device *dev;
};
/* Info for a specific cpu. */
struct tile_net_info {
/* Our cpu. */
int my_cpu;
/* A timer for handling egress completions. */
struct hrtimer egress_timer;
/* True if "egress_timer" is scheduled. */
bool egress_timer_scheduled;
struct info_mpipe {
/* Packet queue. */
gxio_mpipe_iqueue_t iqueue;
/* The NAPI struct. */
struct napi_struct napi;
/* Number of buffers (by kind) which must still be provided. */
unsigned int num_needed_buffers[MAX_KINDS];
/* instance id. */
int instance;
/* True if iqueue is valid. */
bool has_iqueue;
/* NAPI flags. */
bool napi_added;
bool napi_enabled;
/* Comps for each egress channel. */
struct tile_net_comps *comps_for_echannel[TILE_NET_CHANNELS];
/* Transmit wake timer for each egress channel. */
struct tile_net_tx_wake tx_wake[TILE_NET_CHANNELS];
} mpipe[NR_MPIPE_MAX];
};
/* Info for egress on a particular egress channel. */
struct tile_net_egress {
/* The "equeue". */
gxio_mpipe_equeue_t *equeue;
/* The headers for TSO. */
unsigned char *headers;
};
/* Info for a specific device. */
struct tile_net_priv {
/* Our network device. */
struct net_device *dev;
/* The primary link. */
gxio_mpipe_link_t link;
/* The primary channel, if open, else -1. */
int channel;
/* The "loopify" egress link, if needed. */
gxio_mpipe_link_t loopify_link;
/* The "loopify" egress channel, if open, else -1. */
int loopify_channel;
/* The egress channel (channel or loopify_channel). */
int echannel;
/* mPIPE instance, 0 or 1. */
int instance;
/* The timestamp config. */
struct hwtstamp_config stamp_cfg;
};
static struct mpipe_data {
/* The ingress irq. */
int ingress_irq;
/* The "context" for all devices. */
gxio_mpipe_context_t context;
/* Egress info, indexed by "priv->echannel"
* (lazily created as needed).
*/
struct tile_net_egress
egress_for_echannel[TILE_NET_CHANNELS];
/* Devices currently associated with each channel.
* NOTE: The array entry can become NULL after ifconfig down, but
* we do not free the underlying net_device structures, so it is
* safe to use a pointer after reading it from this array.
*/
struct net_device
*tile_net_devs_for_channel[TILE_NET_CHANNELS];
/* The actual memory allocated for the buffer stacks. */
void *buffer_stack_vas[MAX_KINDS];
/* The amount of memory allocated for each buffer stack. */
size_t buffer_stack_bytes[MAX_KINDS];
/* The first buffer stack index
* (small = +0, large = +1, jumbo = +2).
*/
int first_buffer_stack;
/* The buckets. */
int first_bucket;
int num_buckets;
/* PTP-specific data. */
struct ptp_clock *ptp_clock;
struct ptp_clock_info caps;
/* Lock for ptp accessors. */
struct mutex ptp_lock;
} mpipe_data[NR_MPIPE_MAX] = {
[0 ... (NR_MPIPE_MAX - 1)] {
.ingress_irq = -1,
.first_buffer_stack = -1,
.first_bucket = -1,
.num_buckets = 1
}
};
/* A mutex for "tile_net_devs_for_channel". */
static DEFINE_MUTEX(tile_net_devs_for_channel_mutex);
/* The per-cpu info. */
static DEFINE_PER_CPU(struct tile_net_info, per_cpu_info);
/* The buffer size enums for each buffer stack.
* See arch/tile/include/gxio/mpipe.h for the set of possible values.
* We avoid the "10384" size because it can induce "false chaining"
* on "cut-through" jumbo packets.
*/
static gxio_mpipe_buffer_size_enum_t buffer_size_enums[MAX_KINDS] = {
GXIO_MPIPE_BUFFER_SIZE_128,
GXIO_MPIPE_BUFFER_SIZE_1664,
GXIO_MPIPE_BUFFER_SIZE_16384
};
/* Text value of tile_net.cpus if passed as a module parameter. */
static char *network_cpus_string;
/* The actual cpus in "network_cpus". */
static struct cpumask network_cpus_map;
/* If "tile_net.loopify=LINK" was specified, this is "LINK". */
static char *loopify_link_name;
/* If "tile_net.custom" was specified, this is true. */
static bool custom_flag;
/* If "tile_net.jumbo=NUM" was specified, this is "NUM". */
static uint jumbo_num;
/* Obtain mpipe instance from struct tile_net_priv given struct net_device. */
static inline int mpipe_instance(struct net_device *dev)
{
struct tile_net_priv *priv = netdev_priv(dev);
return priv->instance;
}
/* The "tile_net.cpus" argument specifies the cpus that are dedicated
* to handle ingress packets.
*
* The parameter should be in the form "tile_net.cpus=m-n[,x-y]", where
* m, n, x, y are integer numbers that represent the cpus that can be
* neither a dedicated cpu nor a dataplane cpu.
*/
static bool network_cpus_init(void)
{
int rc;
if (network_cpus_string == NULL)
return false;
rc = cpulist_parse_crop(network_cpus_string, &network_cpus_map);
if (rc != 0) {
pr_warn("tile_net.cpus=%s: malformed cpu list\n",
network_cpus_string);
return false;
}
/* Remove dedicated cpus. */
cpumask_and(&network_cpus_map, &network_cpus_map, cpu_possible_mask);
if (cpumask_empty(&network_cpus_map)) {
pr_warn("Ignoring empty tile_net.cpus='%s'.\n",
network_cpus_string);
return false;
}
pr_info("Linux network CPUs: %*pbl\n",
cpumask_pr_args(&network_cpus_map));
return true;
}
module_param_named(cpus, network_cpus_string, charp, 0444);
MODULE_PARM_DESC(cpus, "cpulist of cores that handle network interrupts");
/* The "tile_net.loopify=LINK" argument causes the named device to
* actually use "loop0" for ingress, and "loop1" for egress. This
* allows an app to sit between the actual link and linux, passing
* (some) packets along to linux, and forwarding (some) packets sent
* out by linux.
*/
module_param_named(loopify, loopify_link_name, charp, 0444);
MODULE_PARM_DESC(loopify, "name the device to use loop0/1 for ingress/egress");
/* The "tile_net.custom" argument causes us to ignore the "conventional"
* classifier metadata, in particular, the "l2_offset".
*/
module_param_named(custom, custom_flag, bool, 0444);
MODULE_PARM_DESC(custom, "indicates a (heavily) customized classifier");
/* The "tile_net.jumbo" argument causes us to support "jumbo" packets,
* and to allocate the given number of "jumbo" buffers.
*/
module_param_named(jumbo, jumbo_num, uint, 0444);
MODULE_PARM_DESC(jumbo, "the number of buffers to support jumbo packets");
/* Atomically update a statistics field.
* Note that on TILE-Gx, this operation is fire-and-forget on the
* issuing core (single-cycle dispatch) and takes only a few cycles
* longer than a regular store when the request reaches the home cache.
* No expensive bus management overhead is required.
*/
static void tile_net_stats_add(unsigned long value, unsigned long *field)
{
BUILD_BUG_ON(sizeof(atomic_long_t) != sizeof(unsigned long));
atomic_long_add(value, (atomic_long_t *)field);
}
/* Allocate and push a buffer. */
static bool tile_net_provide_buffer(int instance, int kind)
{
struct mpipe_data *md = &mpipe_data[instance];
gxio_mpipe_buffer_size_enum_t bse = buffer_size_enums[kind];
size_t bs = gxio_mpipe_buffer_size_enum_to_buffer_size(bse);
const unsigned long buffer_alignment = 128;
struct sk_buff *skb;
int len;
len = sizeof(struct sk_buff **) + buffer_alignment + bs;
skb = dev_alloc_skb(len);
if (skb == NULL)
return false;
/* Make room for a back-pointer to 'skb' and guarantee alignment. */
skb_reserve(skb, sizeof(struct sk_buff **));
skb_reserve(skb, -(long)skb->data & (buffer_alignment - 1));
/* Save a back-pointer to 'skb'. */
*(struct sk_buff **)(skb->data - sizeof(struct sk_buff **)) = skb;
/* Make sure "skb" and the back-pointer have been flushed. */
wmb();
gxio_mpipe_push_buffer(&md->context, md->first_buffer_stack + kind,
(void *)va_to_tile_io_addr(skb->data));
return true;
}
/* Convert a raw mpipe buffer to its matching skb pointer. */
static struct sk_buff *mpipe_buf_to_skb(void *va)
{
/* Acquire the associated "skb". */
struct sk_buff **skb_ptr = va - sizeof(*skb_ptr);
struct sk_buff *skb = *skb_ptr;
/* Paranoia. */
if (skb->data != va) {
/* Panic here since there's a reasonable chance
* that corrupt buffers means generic memory
* corruption, with unpredictable system effects.
*/
panic("Corrupt linux buffer! va=%p, skb=%p, skb->data=%p",
va, skb, skb->data);
}
return skb;
}
static void tile_net_pop_all_buffers(int instance, int stack)
{
struct mpipe_data *md = &mpipe_data[instance];
for (;;) {
tile_io_addr_t addr =
(tile_io_addr_t)gxio_mpipe_pop_buffer(&md->context,
stack);
if (addr == 0)
break;
dev_kfree_skb_irq(mpipe_buf_to_skb(tile_io_addr_to_va(addr)));
}
}
/* Provide linux buffers to mPIPE. */
static void tile_net_provide_needed_buffers(void)
{
struct tile_net_info *info = this_cpu_ptr(&per_cpu_info);
int instance, kind;
for (instance = 0; instance < NR_MPIPE_MAX &&
info->mpipe[instance].has_iqueue; instance++) {
for (kind = 0; kind < MAX_KINDS; kind++) {
while (info->mpipe[instance].num_needed_buffers[kind]
!= 0) {
if (!tile_net_provide_buffer(instance, kind)) {
pr_notice("Tile %d still needs"
" some buffers\n",
info->my_cpu);
return;
}
info->mpipe[instance].
num_needed_buffers[kind]--;
}
}
}
}
/* Get RX timestamp, and store it in the skb. */
static void tile_rx_timestamp(struct tile_net_priv *priv, struct sk_buff *skb,
gxio_mpipe_idesc_t *idesc)
{
if (unlikely(priv->stamp_cfg.rx_filter != HWTSTAMP_FILTER_NONE)) {
struct skb_shared_hwtstamps *shhwtstamps = skb_hwtstamps(skb);
memset(shhwtstamps, 0, sizeof(*shhwtstamps));
shhwtstamps->hwtstamp = ktime_set(idesc->time_stamp_sec,
idesc->time_stamp_ns);
}
}
/* Get TX timestamp, and store it in the skb. */
static void tile_tx_timestamp(struct sk_buff *skb, int instance)
{
struct skb_shared_info *shtx = skb_shinfo(skb);
if (unlikely((shtx->tx_flags & SKBTX_HW_TSTAMP) != 0)) {
struct mpipe_data *md = &mpipe_data[instance];
struct skb_shared_hwtstamps shhwtstamps;
struct timespec64 ts;
shtx->tx_flags |= SKBTX_IN_PROGRESS;
gxio_mpipe_get_timestamp(&md->context, &ts);
memset(&shhwtstamps, 0, sizeof(shhwtstamps));
shhwtstamps.hwtstamp = ktime_set(ts.tv_sec, ts.tv_nsec);
skb_tstamp_tx(skb, &shhwtstamps);
}
}
/* Use ioctl() to enable or disable TX or RX timestamping. */
static int tile_hwtstamp_set(struct net_device *dev, struct ifreq *rq)
{
struct hwtstamp_config config;
struct tile_net_priv *priv = netdev_priv(dev);
if (copy_from_user(&config, rq->ifr_data, sizeof(config)))
return -EFAULT;
if (config.flags) /* reserved for future extensions */
return -EINVAL;
switch (config.tx_type) {
case HWTSTAMP_TX_OFF:
case HWTSTAMP_TX_ON:
break;
default:
return -ERANGE;
}
switch (config.rx_filter) {
case HWTSTAMP_FILTER_NONE:
break;
case HWTSTAMP_FILTER_ALL:
case HWTSTAMP_FILTER_SOME:
case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
case HWTSTAMP_FILTER_PTP_V2_EVENT:
case HWTSTAMP_FILTER_PTP_V2_SYNC:
case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
case HWTSTAMP_FILTER_NTP_ALL:
config.rx_filter = HWTSTAMP_FILTER_ALL;
break;
default:
return -ERANGE;
}
if (copy_to_user(rq->ifr_data, &config, sizeof(config)))
return -EFAULT;
priv->stamp_cfg = config;
return 0;
}
static int tile_hwtstamp_get(struct net_device *dev, struct ifreq *rq)
{
struct tile_net_priv *priv = netdev_priv(dev);
if (copy_to_user(rq->ifr_data, &priv->stamp_cfg,
sizeof(priv->stamp_cfg)))
return -EFAULT;
return 0;
}
static inline bool filter_packet(struct net_device *dev, void *buf)
{
/* Filter packets received before we're up. */
if (dev == NULL || !(dev->flags & IFF_UP))
return true;
/* Filter out packets that aren't for us. */
if (!(dev->flags & IFF_PROMISC) &&
!is_multicast_ether_addr(buf) &&
!ether_addr_equal(dev->dev_addr, buf))
return true;
return false;
}
static void tile_net_receive_skb(struct net_device *dev, struct sk_buff *skb,
gxio_mpipe_idesc_t *idesc, unsigned long len)
{
struct tile_net_info *info = this_cpu_ptr(&per_cpu_info);
struct tile_net_priv *priv = netdev_priv(dev);
int instance = priv->instance;
/* Encode the actual packet length. */
skb_put(skb, len);
skb->protocol = eth_type_trans(skb, dev);
/* Acknowledge "good" hardware checksums. */
if (idesc->cs && idesc->csum_seed_val == 0xFFFF)
skb->ip_summed = CHECKSUM_UNNECESSARY;
/* Get RX timestamp from idesc. */
tile_rx_timestamp(priv, skb, idesc);
napi_gro_receive(&info->mpipe[instance].napi, skb);
/* Update stats. */
tile_net_stats_add(1, &dev->stats.rx_packets);
tile_net_stats_add(len, &dev->stats.rx_bytes);
/* Need a new buffer. */
if (idesc->size == buffer_size_enums[0])
info->mpipe[instance].num_needed_buffers[0]++;
else if (idesc->size == buffer_size_enums[1])
info->mpipe[instance].num_needed_buffers[1]++;
else
info->mpipe[instance].num_needed_buffers[2]++;
}
/* Handle a packet. Return true if "processed", false if "filtered". */
static bool tile_net_handle_packet(int instance, gxio_mpipe_idesc_t *idesc)
{
struct tile_net_info *info = this_cpu_ptr(&per_cpu_info);
struct mpipe_data *md = &mpipe_data[instance];
struct net_device *dev = md->tile_net_devs_for_channel[idesc->channel];
uint8_t l2_offset;
void *va;
void *buf;
unsigned long len;
bool filter;
/* Drop packets for which no buffer was available (which can
* happen under heavy load), or for which the me/tr/ce flags
* are set (which can happen for jumbo cut-through packets,
* or with a customized classifier).
*/
if (idesc->be || idesc->me || idesc->tr || idesc->ce) {
if (dev)
tile_net_stats_add(1, &dev->stats.rx_errors);
goto drop;
}
/* Get the "l2_offset", if allowed. */
l2_offset = custom_flag ? 0 : gxio_mpipe_idesc_get_l2_offset(idesc);
/* Get the VA (including NET_IP_ALIGN bytes of "headroom"). */
va = tile_io_addr_to_va((unsigned long)idesc->va);
/* Get the actual packet start/length. */
buf = va + l2_offset;
len = idesc->l2_size - l2_offset;
/* Point "va" at the raw buffer. */
va -= NET_IP_ALIGN;
filter = filter_packet(dev, buf);
if (filter) {
if (dev)
tile_net_stats_add(1, &dev->stats.rx_dropped);
drop:
gxio_mpipe_iqueue_drop(&info->mpipe[instance].iqueue, idesc);
} else {
struct sk_buff *skb = mpipe_buf_to_skb(va);
/* Skip headroom, and any custom header. */
skb_reserve(skb, NET_IP_ALIGN + l2_offset);
tile_net_receive_skb(dev, skb, idesc, len);
}
gxio_mpipe_iqueue_consume(&info->mpipe[instance].iqueue, idesc);
return !filter;
}
/* Handle some packets for the current CPU.
*
* This function handles up to TILE_NET_BATCH idescs per call.
*
* ISSUE: Since we do not provide new buffers until this function is
* complete, we must initially provide enough buffers for each network
* cpu to fill its iqueue and also its batched idescs.
*
* ISSUE: The "rotting packet" race condition occurs if a packet
* arrives after the queue appears to be empty, and before the
* hypervisor interrupt is re-enabled.
*/
static int tile_net_poll(struct napi_struct *napi, int budget)
{
struct tile_net_info *info = this_cpu_ptr(&per_cpu_info);
unsigned int work = 0;
gxio_mpipe_idesc_t *idesc;
int instance, i, n;
struct mpipe_data *md;
struct info_mpipe *info_mpipe =
container_of(napi, struct info_mpipe, napi);
if (budget <= 0)
goto done;
instance = info_mpipe->instance;
while ((n = gxio_mpipe_iqueue_try_peek(
&info_mpipe->iqueue,
&idesc)) > 0) {
for (i = 0; i < n; i++) {
if (i == TILE_NET_BATCH)
goto done;
if (tile_net_handle_packet(instance,
idesc + i)) {
if (++work >= budget)
goto done;
}
}
}
/* There are no packets left. */
napi_complete_done(&info_mpipe->napi, work);
md = &mpipe_data[instance];
/* Re-enable hypervisor interrupts. */
gxio_mpipe_enable_notif_ring_interrupt(
&md->context, info->mpipe[instance].iqueue.ring);
/* HACK: Avoid the "rotting packet" problem. */
if (gxio_mpipe_iqueue_try_peek(&info_mpipe->iqueue, &idesc) > 0)
napi_schedule(&info_mpipe->napi);
/* ISSUE: Handle completions? */
done:
tile_net_provide_needed_buffers();
return work;
}
/* Handle an ingress interrupt from an instance on the current cpu. */
static irqreturn_t tile_net_handle_ingress_irq(int irq, void *id)
{
struct tile_net_info *info = this_cpu_ptr(&per_cpu_info);
napi_schedule(&info->mpipe[(uint64_t)id].napi);
return IRQ_HANDLED;
}
/* Free some completions. This must be called with interrupts blocked. */
static int tile_net_free_comps(gxio_mpipe_equeue_t *equeue,
struct tile_net_comps *comps,
int limit, bool force_update)
{
int n = 0;
while (comps->comp_last < comps->comp_next) {
unsigned int cid = comps->comp_last % TILE_NET_MAX_COMPS;
struct tile_net_comp *comp = &comps->comp_queue[cid];
if (!gxio_mpipe_equeue_is_complete(equeue, comp->when,
force_update || n == 0))
break;
dev_kfree_skb_irq(comp->skb);
comps->comp_last++;
if (++n == limit)
break;
}
return n;
}
/* Add a completion. This must be called with interrupts blocked.
* tile_net_equeue_try_reserve() will have ensured a free completion entry.
*/
static void add_comp(gxio_mpipe_equeue_t *equeue,
struct tile_net_comps *comps,
uint64_t when, struct sk_buff *skb)
{
int cid = comps->comp_next % TILE_NET_MAX_COMPS;
comps->comp_queue[cid].when = when;
comps->comp_queue[cid].skb = skb;
comps->comp_next++;
}
static void tile_net_schedule_tx_wake_timer(struct net_device *dev,
int tx_queue_idx)
{
struct tile_net_info *info = &per_cpu(per_cpu_info, tx_queue_idx);
struct tile_net_priv *priv = netdev_priv(dev);
int instance = priv->instance;
struct tile_net_tx_wake *tx_wake =
&info->mpipe[instance].tx_wake[priv->echannel];
hrtimer_start(&tx_wake->timer,
TX_TIMER_DELAY_USEC * 1000UL,
HRTIMER_MODE_REL_PINNED);
}
static enum hrtimer_restart tile_net_handle_tx_wake_timer(struct hrtimer *t)
{
struct tile_net_tx_wake *tx_wake =
container_of(t, struct tile_net_tx_wake, timer);
netif_wake_subqueue(tx_wake->dev, tx_wake->tx_queue_idx);
return HRTIMER_NORESTART;
}
/* Make sure the egress timer is scheduled. */
static void tile_net_schedule_egress_timer(void)
{
struct tile_net_info *info = this_cpu_ptr(&per_cpu_info);
if (!info->egress_timer_scheduled) {
hrtimer_start(&info->egress_timer,
EGRESS_TIMER_DELAY_USEC * 1000UL,
HRTIMER_MODE_REL_PINNED);
info->egress_timer_scheduled = true;
}
}
/* The "function" for "info->egress_timer".
*
* This timer will reschedule itself as long as there are any pending
* completions expected for this tile.
*/
static enum hrtimer_restart tile_net_handle_egress_timer(struct hrtimer *t)
{
struct tile_net_info *info = this_cpu_ptr(&per_cpu_info);
unsigned long irqflags;
bool pending = false;
int i, instance;
local_irq_save(irqflags);
/* The timer is no longer scheduled. */
info->egress_timer_scheduled = false;
/* Free all possible comps for this tile. */
for (instance = 0; instance < NR_MPIPE_MAX &&
info->mpipe[instance].has_iqueue; instance++) {
for (i = 0; i < TILE_NET_CHANNELS; i++) {
struct tile_net_egress *egress =
&mpipe_data[instance].egress_for_echannel[i];
struct tile_net_comps *comps =
info->mpipe[instance].comps_for_echannel[i];
if (!egress || comps->comp_last >= comps->comp_next)
continue;
tile_net_free_comps(egress->equeue, comps, -1, true);
pending = pending ||
(comps->comp_last < comps->comp_next);
}
}
/* Reschedule timer if needed. */
if (pending)
tile_net_schedule_egress_timer();
local_irq_restore(irqflags);
return HRTIMER_NORESTART;
}
/* PTP clock operations. */
static int ptp_mpipe_adjfreq(struct ptp_clock_info *ptp, s32 ppb)
{
int ret = 0;
struct mpipe_data *md = container_of(ptp, struct mpipe_data, caps);
mutex_lock(&md->ptp_lock);
if (gxio_mpipe_adjust_timestamp_freq(&md->context, ppb))
ret = -EINVAL;
mutex_unlock(&md->ptp_lock);
return ret;
}
static int ptp_mpipe_adjtime(struct ptp_clock_info *ptp, s64 delta)
{
int ret = 0;
struct mpipe_data *md = container_of(ptp, struct mpipe_data, caps);
mutex_lock(&md->ptp_lock);
if (gxio_mpipe_adjust_timestamp(&md->context, delta))
ret = -EBUSY;
mutex_unlock(&md->ptp_lock);
return ret;
}
static int ptp_mpipe_gettime(struct ptp_clock_info *ptp,
struct timespec64 *ts)
{
int ret = 0;
struct mpipe_data *md = container_of(ptp, struct mpipe_data, caps);
mutex_lock(&md->ptp_lock);
if (gxio_mpipe_get_timestamp(&md->context, ts))
ret = -EBUSY;
mutex_unlock(&md->ptp_lock);
return ret;
}
static int ptp_mpipe_settime(struct ptp_clock_info *ptp,
const struct timespec64 *ts)
{
int ret = 0;
struct mpipe_data *md = container_of(ptp, struct mpipe_data, caps);
mutex_lock(&md->ptp_lock);
if (gxio_mpipe_set_timestamp(&md->context, ts))
ret = -EBUSY;
mutex_unlock(&md->ptp_lock);
return ret;
}
static int ptp_mpipe_enable(struct ptp_clock_info *ptp,
struct ptp_clock_request *request, int on)
{
return -EOPNOTSUPP;
}
static const struct ptp_clock_info ptp_mpipe_caps = {
.owner = THIS_MODULE,
.name = "mPIPE clock",
.max_adj = 999999999,
.n_ext_ts = 0,
.n_pins = 0,
.pps = 0,
.adjfreq = ptp_mpipe_adjfreq,
.adjtime = ptp_mpipe_adjtime,
.gettime64 = ptp_mpipe_gettime,
.settime64 = ptp_mpipe_settime,
.enable = ptp_mpipe_enable,
};
/* Sync mPIPE's timestamp up with Linux system time and register PTP clock. */
static void register_ptp_clock(struct net_device *dev, struct mpipe_data *md)
{
struct timespec64 ts;
ktime_get_ts64(&ts);
gxio_mpipe_set_timestamp(&md->context, &ts);
mutex_init(&md->ptp_lock);
md->caps = ptp_mpipe_caps;
md->ptp_clock = ptp_clock_register(&md->caps, NULL);
if (IS_ERR(md->ptp_clock))
netdev_err(dev, "ptp_clock_register failed %ld\n",
PTR_ERR(md->ptp_clock));
}
/* Initialize PTP fields in a new device. */
static void init_ptp_dev(struct tile_net_priv *priv)
{
priv->stamp_cfg.rx_filter = HWTSTAMP_FILTER_NONE;
priv->stamp_cfg.tx_type = HWTSTAMP_TX_OFF;
}
/* Helper functions for "tile_net_update()". */
static void enable_ingress_irq(void *irq)
{
enable_percpu_irq((long)irq, 0);
}
static void disable_ingress_irq(void *irq)
{
disable_percpu_irq((long)irq);
}
/* Helper function for tile_net_open() and tile_net_stop().
* Always called under tile_net_devs_for_channel_mutex.
*/
static int tile_net_update(struct net_device *dev)
{
static gxio_mpipe_rules_t rules; /* too big to fit on the stack */
bool saw_channel = false;
int instance = mpipe_instance(dev);
struct mpipe_data *md = &mpipe_data[instance];
int channel;
int rc;
int cpu;
saw_channel = false;
gxio_mpipe_rules_init(&rules, &md->context);
for (channel = 0; channel < TILE_NET_CHANNELS; channel++) {
if (md->tile_net_devs_for_channel[channel] == NULL)
continue;
if (!saw_channel) {
saw_channel = true;
gxio_mpipe_rules_begin(&rules, md->first_bucket,
md->num_buckets, NULL);
gxio_mpipe_rules_set_headroom(&rules, NET_IP_ALIGN);
}
gxio_mpipe_rules_add_channel(&rules, channel);
}
/* NOTE: This can fail if there is no classifier.
* ISSUE: Can anything else cause it to fail?
*/
rc = gxio_mpipe_rules_commit(&rules);
if (rc != 0) {
netdev_warn(dev, "gxio_mpipe_rules_commit: mpipe[%d] %d\n",
instance, rc);
return -EIO;
}
/* Update all cpus, sequentially (to protect "netif_napi_add()").
* We use on_each_cpu to handle the IPI mask or unmask.
*/
if (!saw_channel)
on_each_cpu(disable_ingress_irq,
(void *)(long)(md->ingress_irq), 1);
for_each_online_cpu(cpu) {
struct tile_net_info *info = &per_cpu(per_cpu_info, cpu);
if (!info->mpipe[instance].has_iqueue)
continue;
if (saw_channel) {
if (!info->mpipe[instance].napi_added) {
netif_napi_add(dev, &info->mpipe[instance].napi,
tile_net_poll, TILE_NET_WEIGHT);
info->mpipe[instance].napi_added = true;
}
if (!info->mpipe[instance].napi_enabled) {
napi_enable(&info->mpipe[instance].napi);
info->mpipe[instance].napi_enabled = true;
}
} else {
if (info->mpipe[instance].napi_enabled) {
napi_disable(&info->mpipe[instance].napi);
info->mpipe[instance].napi_enabled = false;
}
/* FIXME: Drain the iqueue. */
}
}
if (saw_channel)
on_each_cpu(enable_ingress_irq,
(void *)(long)(md->ingress_irq), 1);
/* HACK: Allow packets to flow in the simulator. */
if (saw_channel)
sim_enable_mpipe_links(instance, -1);
return 0;
}
/* Initialize a buffer stack. */
static int create_buffer_stack(struct net_device *dev,
int kind, size_t num_buffers)
{
pte_t hash_pte = pte_set_home((pte_t) { 0 }, PAGE_HOME_HASH);
int instance = mpipe_instance(dev);
struct mpipe_data *md = &mpipe_data[instance];
size_t needed = gxio_mpipe_calc_buffer_stack_bytes(num_buffers);
int stack_idx = md->first_buffer_stack + kind;
void *va;
int i, rc;
/* Round up to 64KB and then use alloc_pages() so we get the
* required 64KB alignment.
*/
md->buffer_stack_bytes[kind] =
ALIGN(needed, 64 * 1024);
va = alloc_pages_exact(md->buffer_stack_bytes[kind], GFP_KERNEL);
if (va == NULL) {
netdev_err(dev,
"Could not alloc %zd bytes for buffer stack %d\n",
md->buffer_stack_bytes[kind], kind);
return -ENOMEM;
}
/* Initialize the buffer stack. */
rc = gxio_mpipe_init_buffer_stack(&md->context, stack_idx,
buffer_size_enums[kind], va,
md->buffer_stack_bytes[kind], 0);
if (rc != 0) {
netdev_err(dev, "gxio_mpipe_init_buffer_stack: mpipe[%d] %d\n",
instance, rc);
free_pages_exact(va, md->buffer_stack_bytes[kind]);
return rc;
}
md->buffer_stack_vas[kind] = va;
rc = gxio_mpipe_register_client_memory(&md->context, stack_idx,
hash_pte, 0);
if (rc != 0) {
netdev_err(dev,
"gxio_mpipe_register_client_memory: mpipe[%d] %d\n",
instance, rc);
return rc;
}
/* Provide initial buffers. */
for (i = 0; i < num_buffers; i++) {
if (!tile_net_provide_buffer(instance, kind)) {
netdev_err(dev, "Cannot allocate initial sk_bufs!\n");
return -ENOMEM;
}
}
return 0;
}
/* Allocate and initialize mpipe buffer stacks, and register them in
* the mPIPE TLBs, for small, large, and (possibly) jumbo packet sizes.
* This routine supports tile_net_init_mpipe(), below.
*/
static int init_buffer_stacks(struct net_device *dev,
int network_cpus_count)
{
int num_kinds = MAX_KINDS - (jumbo_num == 0);
size_t num_buffers;
int rc;
int instance = mpipe_instance(dev);
struct mpipe_data *md = &mpipe_data[instance];
/* Allocate the buffer stacks. */
rc = gxio_mpipe_alloc_buffer_stacks(&md->context, num_kinds, 0, 0);
if (rc < 0) {
netdev_err(dev,
"gxio_mpipe_alloc_buffer_stacks: mpipe[%d] %d\n",
instance, rc);
return rc;
}
md->first_buffer_stack = rc;
/* Enough small/large buffers to (normally) avoid buffer errors. */
num_buffers =
network_cpus_count * (IQUEUE_ENTRIES + TILE_NET_BATCH);
/* Allocate the small memory stack. */
if (rc >= 0)
rc = create_buffer_stack(dev, 0, num_buffers);
/* Allocate the large buffer stack. */
if (rc >= 0)
rc = create_buffer_stack(dev, 1, num_buffers);
/* Allocate the jumbo buffer stack if needed. */
if (rc >= 0 && jumbo_num != 0)
rc = create_buffer_stack(dev, 2, jumbo_num);
return rc;
}
/* Allocate per-cpu resources (memory for completions and idescs).
* This routine supports tile_net_init_mpipe(), below.
*/
static int alloc_percpu_mpipe_resources(struct net_device *dev,
int cpu, int ring)
{
struct tile_net_info *info = &per_cpu(per_cpu_info, cpu);
int order, i, rc;
int instance = mpipe_instance(dev);
struct mpipe_data *md = &mpipe_data[instance];
struct page *page;
void *addr;
/* Allocate the "comps". */
order = get_order(COMPS_SIZE);
page = homecache_alloc_pages(GFP_KERNEL, order, cpu);
if (page == NULL) {
netdev_err(dev, "Failed to alloc %zd bytes comps memory\n",
COMPS_SIZE);
return -ENOMEM;
}
addr = pfn_to_kaddr(page_to_pfn(page));
memset(addr, 0, COMPS_SIZE);
for (i = 0; i < TILE_NET_CHANNELS; i++)
info->mpipe[instance].comps_for_echannel[i] =
addr + i * sizeof(struct tile_net_comps);
/* If this is a network cpu, create an iqueue. */
if (cpumask_test_cpu(cpu, &network_cpus_map)) {
order = get_order(NOTIF_RING_SIZE);
page = homecache_alloc_pages(GFP_KERNEL, order, cpu);
if (page == NULL) {
netdev_err(dev,
"Failed to alloc %zd bytes iqueue memory\n",
NOTIF_RING_SIZE);
return -ENOMEM;
}
addr = pfn_to_kaddr(page_to_pfn(page));
rc = gxio_mpipe_iqueue_init(&info->mpipe[instance].iqueue,
&md->context, ring++, addr,
NOTIF_RING_SIZE, 0);
if (rc < 0) {
netdev_err(dev,
"gxio_mpipe_iqueue_init failed: %d\n", rc);
return rc;
}
info->mpipe[instance].has_iqueue = true;
}
return ring;
}
/* Initialize NotifGroup and buckets.
* This routine supports tile_net_init_mpipe(), below.
*/
static int init_notif_group_and_buckets(struct net_device *dev,
int ring, int network_cpus_count)
{
int group, rc;
int instance = mpipe_instance(dev);
struct mpipe_data *md = &mpipe_data[instance];
/* Allocate one NotifGroup. */
rc = gxio_mpipe_alloc_notif_groups(&md->context, 1, 0, 0);
if (rc < 0) {
netdev_err(dev, "gxio_mpipe_alloc_notif_groups: mpipe[%d] %d\n",
instance, rc);
return rc;
}
group = rc;
/* Initialize global num_buckets value. */
if (network_cpus_count > 4)
md->num_buckets = 256;
else if (network_cpus_count > 1)
md->num_buckets = 16;
/* Allocate some buckets, and set global first_bucket value. */
rc = gxio_mpipe_alloc_buckets(&md->context, md->num_buckets, 0, 0);
if (rc < 0) {
netdev_err(dev, "gxio_mpipe_alloc_buckets: mpipe[%d] %d\n",
instance, rc);
return rc;
}
md->first_bucket = rc;
/* Init group and buckets. */
rc = gxio_mpipe_init_notif_group_and_buckets(
&md->context, group, ring, network_cpus_count,
md->first_bucket, md->num_buckets,
GXIO_MPIPE_BUCKET_STICKY_FLOW_LOCALITY);
if (rc != 0) {
netdev_err(dev, "gxio_mpipe_init_notif_group_and_buckets: "
"mpipe[%d] %d\n", instance, rc);
return rc;
}
return 0;
}
/* Create an irq and register it, then activate the irq and request
* interrupts on all cores. Note that "ingress_irq" being initialized
* is how we know not to call tile_net_init_mpipe() again.
* This routine supports tile_net_init_mpipe(), below.
*/
static int tile_net_setup_interrupts(struct net_device *dev)
{
int cpu, rc, irq;
int instance = mpipe_instance(dev);
struct mpipe_data *md = &mpipe_data[instance];
irq = md->ingress_irq;
if (irq < 0) {
irq = irq_alloc_hwirq(-1);
if (!irq) {
netdev_err(dev,
"create_irq failed: mpipe[%d] %d\n",
instance, irq);
return irq;
}
tile_irq_activate(irq, TILE_IRQ_PERCPU);
rc = request_irq(irq, tile_net_handle_ingress_irq,
0, "tile_net", (void *)((uint64_t)instance));
if (rc != 0) {
netdev_err(dev, "request_irq failed: mpipe[%d] %d\n",
instance, rc);
irq_free_hwirq(irq);
return rc;
}
md->ingress_irq = irq;
}
for_each_online_cpu(cpu) {
struct tile_net_info *info = &per_cpu(per_cpu_info, cpu);
if (info->mpipe[instance].has_iqueue) {
gxio_mpipe_request_notif_ring_interrupt(&md->context,
cpu_x(cpu), cpu_y(cpu), KERNEL_PL, irq,
info->mpipe[instance].iqueue.ring);
}
}
return 0;
}
/* Undo any state set up partially by a failed call to tile_net_init_mpipe. */
static void tile_net_init_mpipe_fail(int instance)
{
int kind, cpu;
struct mpipe_data *md = &mpipe_data[instance];
/* Do cleanups that require the mpipe context first. */
for (kind = 0; kind < MAX_KINDS; kind++) {
if (md->buffer_stack_vas[kind] != NULL) {
tile_net_pop_all_buffers(instance,
md->first_buffer_stack +
kind);
}
}
/* Destroy mpipe context so the hardware no longer owns any memory. */
gxio_mpipe_destroy(&md->context);
for_each_online_cpu(cpu) {
struct tile_net_info *info = &per_cpu(per_cpu_info, cpu);
free_pages(
(unsigned long)(
info->mpipe[instance].comps_for_echannel[0]),
get_order(COMPS_SIZE));
info->mpipe[instance].comps_for_echannel[0] = NULL;
free_pages((unsigned long)(info->mpipe[instance].iqueue.idescs),
get_order(NOTIF_RING_SIZE));
info->mpipe[instance].iqueue.idescs = NULL;
}
for (kind = 0; kind < MAX_KINDS; kind++) {
if (md->buffer_stack_vas[kind] != NULL) {
free_pages_exact(md->buffer_stack_vas[kind],
md->buffer_stack_bytes[kind]);
md->buffer_stack_vas[kind] = NULL;
}
}
md->first_buffer_stack = -1;
md->first_bucket = -1;
}
/* The first time any tilegx network device is opened, we initialize
* the global mpipe state. If this step fails, we fail to open the
* device, but if it succeeds, we never need to do it again, and since
* tile_net can't be unloaded, we never undo it.
*
* Note that some resources in this path (buffer stack indices,
* bindings from init_buffer_stack, etc.) are hypervisor resources
* that are freed implicitly by gxio_mpipe_destroy().
*/
static int tile_net_init_mpipe(struct net_device *dev)
{
int rc;
int cpu;
int first_ring, ring;
int instance = mpipe_instance(dev);
struct mpipe_data *md = &mpipe_data[instance];
int network_cpus_count = cpumask_weight(&network_cpus_map);
if (!hash_default) {
netdev_err(dev, "Networking requires hash_default!\n");
return -EIO;
}
rc = gxio_mpipe_init(&md->context, instance);
if (rc != 0) {
netdev_err(dev, "gxio_mpipe_init: mpipe[%d] %d\n",
instance, rc);
return -EIO;
}
/* Set up the buffer stacks. */
rc = init_buffer_stacks(dev, network_cpus_count);
if (rc != 0)
goto fail;
/* Allocate one NotifRing for each network cpu. */
rc = gxio_mpipe_alloc_notif_rings(&md->context,
network_cpus_count, 0, 0);
if (rc < 0) {
netdev_err(dev, "gxio_mpipe_alloc_notif_rings failed %d\n",
rc);
goto fail;
}
/* Init NotifRings per-cpu. */
first_ring = rc;
ring = first_ring;
for_each_online_cpu(cpu) {
rc = alloc_percpu_mpipe_resources(dev, cpu, ring);
if (rc < 0)
goto fail;
ring = rc;
}
/* Initialize NotifGroup and buckets. */
rc = init_notif_group_and_buckets(dev, first_ring, network_cpus_count);
if (rc != 0)
goto fail;
/* Create and enable interrupts. */
rc = tile_net_setup_interrupts(dev);
if (rc != 0)
goto fail;
/* Register PTP clock and set mPIPE timestamp, if configured. */
register_ptp_clock(dev, md);
return 0;
fail:
tile_net_init_mpipe_fail(instance);
return rc;
}
/* Create persistent egress info for a given egress channel.
* Note that this may be shared between, say, "gbe0" and "xgbe0".
* ISSUE: Defer header allocation until TSO is actually needed?
*/
static int tile_net_init_egress(struct net_device *dev, int echannel)
{
static int ering = -1;
struct page *headers_page, *edescs_page, *equeue_page;
gxio_mpipe_edesc_t *edescs;
gxio_mpipe_equeue_t *equeue;
unsigned char *headers;
int headers_order, edescs_order, equeue_order;
size_t edescs_size;
int rc = -ENOMEM;
int instance = mpipe_instance(dev);
struct mpipe_data *md = &mpipe_data[instance];
/* Only initialize once. */
if (md->egress_for_echannel[echannel].equeue != NULL)
return 0;
/* Allocate memory for the "headers". */
headers_order = get_order(EQUEUE_ENTRIES * HEADER_BYTES);
headers_page = alloc_pages(GFP_KERNEL, headers_order);
if (headers_page == NULL) {
netdev_warn(dev,
"Could not alloc %zd bytes for TSO headers.\n",
PAGE_SIZE << headers_order);
goto fail;
}
headers = pfn_to_kaddr(page_to_pfn(headers_page));
/* Allocate memory for the "edescs". */
edescs_size = EQUEUE_ENTRIES * sizeof(*edescs);
edescs_order = get_order(edescs_size);
edescs_page = alloc_pages(GFP_KERNEL, edescs_order);
if (edescs_page == NULL) {
netdev_warn(dev,
"Could not alloc %zd bytes for eDMA ring.\n",
edescs_size);
goto fail_headers;
}
edescs = pfn_to_kaddr(page_to_pfn(edescs_page));
/* Allocate memory for the "equeue". */
equeue_order = get_order(sizeof(*equeue));
equeue_page = alloc_pages(GFP_KERNEL, equeue_order);
if (equeue_page == NULL) {
netdev_warn(dev,
"Could not alloc %zd bytes for equeue info.\n",
PAGE_SIZE << equeue_order);
goto fail_edescs;
}
equeue = pfn_to_kaddr(page_to_pfn(equeue_page));
/* Allocate an edma ring (using a one entry "free list"). */
if (ering < 0) {
rc = gxio_mpipe_alloc_edma_rings(&md->context, 1, 0, 0);
if (rc < 0) {
netdev_warn(dev, "gxio_mpipe_alloc_edma_rings: "
"mpipe[%d] %d\n", instance, rc);
goto fail_equeue;
}
ering = rc;
}
/* Initialize the equeue. */
rc = gxio_mpipe_equeue_init(equeue, &md->context, ering, echannel,
edescs, edescs_size, 0);
if (rc != 0) {
netdev_err(dev, "gxio_mpipe_equeue_init: mpipe[%d] %d\n",
instance, rc);
goto fail_equeue;
}
/* Don't reuse the ering later. */
ering = -1;
if (jumbo_num != 0) {
/* Make sure "jumbo" packets can be egressed safely. */
if (gxio_mpipe_equeue_set_snf_size(equeue, 10368) < 0) {
/* ISSUE: There is no "gxio_mpipe_equeue_destroy()". */
netdev_warn(dev, "Jumbo packets may not be egressed"
" properly on channel %d\n", echannel);
}
}
/* Done. */
md->egress_for_echannel[echannel].equeue = equeue;
md->egress_for_echannel[echannel].headers = headers;
return 0;
fail_equeue:
__free_pages(equeue_page, equeue_order);
fail_edescs:
__free_pages(edescs_page, edescs_order);
fail_headers:
__free_pages(headers_page, headers_order);
fail:
return rc;
}
/* Return channel number for a newly-opened link. */
static int tile_net_link_open(struct net_device *dev, gxio_mpipe_link_t *link,
const char *link_name)
{
int instance = mpipe_instance(dev);
struct mpipe_data *md = &mpipe_data[instance];
int rc = gxio_mpipe_link_open(link, &md->context, link_name, 0);
if (rc < 0) {
netdev_err(dev, "Failed to open '%s', mpipe[%d], %d\n",
link_name, instance, rc);
return rc;
}
if (jumbo_num != 0) {
u32 attr = GXIO_MPIPE_LINK_RECEIVE_JUMBO;
rc = gxio_mpipe_link_set_attr(link, attr, 1);
if (rc != 0) {
netdev_err(dev,
"Cannot receive jumbo packets on '%s'\n",
link_name);
gxio_mpipe_link_close(link);
return rc;
}
}
rc = gxio_mpipe_link_channel(link);
if (rc < 0 || rc >= TILE_NET_CHANNELS) {
netdev_err(dev, "gxio_mpipe_link_channel bad value: %d\n", rc);
gxio_mpipe_link_close(link);
return -EINVAL;
}
return rc;
}
/* Help the kernel activate the given network interface. */
static int tile_net_open(struct net_device *dev)
{
struct tile_net_priv *priv = netdev_priv(dev);
int cpu, rc, instance;
mutex_lock(&tile_net_devs_for_channel_mutex);
/* Get the instance info. */
rc = gxio_mpipe_link_instance(dev->name);
if (rc < 0 || rc >= NR_MPIPE_MAX) {
mutex_unlock(&tile_net_devs_for_channel_mutex);
return -EIO;
}
priv->instance = rc;
instance = rc;
if (!mpipe_data[rc].context.mmio_fast_base) {
/* Do one-time initialization per instance the first time
* any device is opened.
*/
rc = tile_net_init_mpipe(dev);
if (rc != 0)
goto fail;
}
/* Determine if this is the "loopify" device. */
if (unlikely((loopify_link_name != NULL) &&
!strcmp(dev->name, loopify_link_name))) {
rc = tile_net_link_open(dev, &priv->link, "loop0");
if (rc < 0)
goto fail;
priv->channel = rc;
rc = tile_net_link_open(dev, &priv->loopify_link, "loop1");
if (rc < 0)
goto fail;
priv->loopify_channel = rc;
priv->echannel = rc;
} else {
rc = tile_net_link_open(dev, &priv->link, dev->name);
if (rc < 0)
goto fail;
priv->channel = rc;
priv->echannel = rc;
}
/* Initialize egress info (if needed). Once ever, per echannel. */
rc = tile_net_init_egress(dev, priv->echannel);
if (rc != 0)
goto fail;
mpipe_data[instance].tile_net_devs_for_channel[priv->channel] = dev;
rc = tile_net_update(dev);
if (rc != 0)
goto fail;
mutex_unlock(&tile_net_devs_for_channel_mutex);
/* Initialize the transmit wake timer for this device for each cpu. */
for_each_online_cpu(cpu) {
struct tile_net_info *info = &per_cpu(per_cpu_info, cpu);
struct tile_net_tx_wake *tx_wake =
&info->mpipe[instance].tx_wake[priv->echannel];
hrtimer_init(&tx_wake->timer, CLOCK_MONOTONIC,
HRTIMER_MODE_REL);
tx_wake->tx_queue_idx = cpu;
tx_wake->timer.function = tile_net_handle_tx_wake_timer;
tx_wake->dev = dev;
}
for_each_online_cpu(cpu)
netif_start_subqueue(dev, cpu);
netif_carrier_on(dev);
return 0;
fail:
if (priv->loopify_channel >= 0) {
if (gxio_mpipe_link_close(&priv->loopify_link) != 0)
netdev_warn(dev, "Failed to close loopify link!\n");
priv->loopify_channel = -1;
}
if (priv->channel >= 0) {
if (gxio_mpipe_link_close(&priv->link) != 0)
netdev_warn(dev, "Failed to close link!\n");
priv->channel = -1;
}
priv->echannel = -1;
mpipe_data[instance].tile_net_devs_for_channel[priv->channel] = NULL;
mutex_unlock(&tile_net_devs_for_channel_mutex);
/* Don't return raw gxio error codes to generic Linux. */
return (rc > -512) ? rc : -EIO;
}
/* Help the kernel deactivate the given network interface. */
static int tile_net_stop(struct net_device *dev)
{
struct tile_net_priv *priv = netdev_priv(dev);
int cpu;
int instance = priv->instance;
struct mpipe_data *md = &mpipe_data[instance];
for_each_online_cpu(cpu) {
struct tile_net_info *info = &per_cpu(per_cpu_info, cpu);
struct tile_net_tx_wake *tx_wake =
&info->mpipe[instance].tx_wake[priv->echannel];
hrtimer_cancel(&tx_wake->timer);
netif_stop_subqueue(dev, cpu);
}
mutex_lock(&tile_net_devs_for_channel_mutex);
md->tile_net_devs_for_channel[priv->channel] = NULL;
(void)tile_net_update(dev);
if (priv->loopify_channel >= 0) {
if (gxio_mpipe_link_close(&priv->loopify_link) != 0)
netdev_warn(dev, "Failed to close loopify link!\n");
priv->loopify_channel = -1;
}
if (priv->channel >= 0) {
if (gxio_mpipe_link_close(&priv->link) != 0)
netdev_warn(dev, "Failed to close link!\n");
priv->channel = -1;
}
priv->echannel = -1;
mutex_unlock(&tile_net_devs_for_channel_mutex);
return 0;
}
/* Determine the VA for a fragment. */
static inline void *tile_net_frag_buf(skb_frag_t *f)
{
unsigned long pfn = page_to_pfn(skb_frag_page(f));
return pfn_to_kaddr(pfn) + f->page_offset;
}
/* Acquire a completion entry and an egress slot, or if we can't,
* stop the queue and schedule the tx_wake timer.
*/
static s64 tile_net_equeue_try_reserve(struct net_device *dev,
int tx_queue_idx,
struct tile_net_comps *comps,
gxio_mpipe_equeue_t *equeue,
int num_edescs)
{
/* Try to acquire a completion entry. */
if (comps->comp_next - comps->comp_last < TILE_NET_MAX_COMPS - 1 ||
tile_net_free_comps(equeue, comps, 32, false) != 0) {
/* Try to acquire an egress slot. */
s64 slot = gxio_mpipe_equeue_try_reserve(equeue, num_edescs);
if (slot >= 0)
return slot;
/* Freeing some completions gives the equeue time to drain. */
tile_net_free_comps(equeue, comps, TILE_NET_MAX_COMPS, false);
slot = gxio_mpipe_equeue_try_reserve(equeue, num_edescs);
if (slot >= 0)
return slot;
}
/* Still nothing; give up and stop the queue for a short while. */
netif_stop_subqueue(dev, tx_queue_idx);
tile_net_schedule_tx_wake_timer(dev, tx_queue_idx);
return -1;
}
/* Determine how many edesc's are needed for TSO.
*
* Sometimes, if "sendfile()" requires copying, we will be called with
* "data" containing the header and payload, with "frags" being empty.
* Sometimes, for example when using NFS over TCP, a single segment can
* span 3 fragments. This requires special care.
*/
static int tso_count_edescs(struct sk_buff *skb)
{
struct skb_shared_info *sh = skb_shinfo(skb);
unsigned int sh_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
unsigned int data_len = skb->len - sh_len;
unsigned int p_len = sh->gso_size;
long f_id = -1; /* id of the current fragment */
long f_size = skb_headlen(skb) - sh_len; /* current fragment size */
long f_used = 0; /* bytes used from the current fragment */
long n; /* size of the current piece of payload */
int num_edescs = 0;
int segment;
for (segment = 0; segment < sh->gso_segs; segment++) {
unsigned int p_used = 0;
/* One edesc for header and for each piece of the payload. */
for (num_edescs++; p_used < p_len; num_edescs++) {
/* Advance as needed. */
while (f_used >= f_size) {
f_id++;
f_size = skb_frag_size(&sh->frags[f_id]);
f_used = 0;
}
/* Use bytes from the current fragment. */
n = p_len - p_used;
if (n > f_size - f_used)
n = f_size - f_used;
f_used += n;
p_used += n;
}
/* The last segment may be less than gso_size. */
data_len -= p_len;
if (data_len < p_len)
p_len = data_len;
}
return num_edescs;
}
/* Prepare modified copies of the skbuff headers. */
static void tso_headers_prepare(struct sk_buff *skb, unsigned char *headers,
s64 slot)
{
struct skb_shared_info *sh = skb_shinfo(skb);
struct iphdr *ih;
struct ipv6hdr *ih6;
struct tcphdr *th;
unsigned int sh_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
unsigned int data_len = skb->len - sh_len;
unsigned char *data = skb->data;
unsigned int ih_off, th_off, p_len;
unsigned int isum_seed, tsum_seed, seq;
unsigned int uninitialized_var(id);
int is_ipv6;
long f_id = -1; /* id of the current fragment */
long f_size = skb_headlen(skb) - sh_len; /* current fragment size */
long f_used = 0; /* bytes used from the current fragment */
long n; /* size of the current piece of payload */
int segment;
/* Locate original headers and compute various lengths. */
is_ipv6 = skb_is_gso_v6(skb);
if (is_ipv6) {
ih6 = ipv6_hdr(skb);
ih_off = skb_network_offset(skb);
} else {
ih = ip_hdr(skb);
ih_off = skb_network_offset(skb);
isum_seed = ((0xFFFF - ih->check) +
(0xFFFF - ih->tot_len) +
(0xFFFF - ih->id));
id = ntohs(ih->id);
}
th = tcp_hdr(skb);
th_off = skb_transport_offset(skb);
p_len = sh->gso_size;
tsum_seed = th->check + (0xFFFF ^ htons(skb->len));
seq = ntohl(th->seq);
/* Prepare all the headers. */
for (segment = 0; segment < sh->gso_segs; segment++) {
unsigned char *buf;
unsigned int p_used = 0;
/* Copy to the header memory for this segment. */
buf = headers + (slot % EQUEUE_ENTRIES) * HEADER_BYTES +
NET_IP_ALIGN;
memcpy(buf, data, sh_len);
/* Update copied ip header. */
if (is_ipv6) {
ih6 = (struct ipv6hdr *)(buf + ih_off);
ih6->payload_len = htons(sh_len + p_len - ih_off -
sizeof(*ih6));
} else {
ih = (struct iphdr *)(buf + ih_off);
ih->tot_len = htons(sh_len + p_len - ih_off);
ih->id = htons(id++);
ih->check = csum_long(isum_seed + ih->tot_len +
ih->id) ^ 0xffff;
}
/* Update copied tcp header. */
th = (struct tcphdr *)(buf + th_off);
th->seq = htonl(seq);
th->check = csum_long(tsum_seed + htons(sh_len + p_len));
if (segment != sh->gso_segs - 1) {
th->fin = 0;
th->psh = 0;
}
/* Skip past the header. */
slot++;
/* Skip past the payload. */
while (p_used < p_len) {
/* Advance as needed. */
while (f_used >= f_size) {
f_id++;
f_size = skb_frag_size(&sh->frags[f_id]);
f_used = 0;
}
/* Use bytes from the current fragment. */
n = p_len - p_used;
if (n > f_size - f_used)
n = f_size - f_used;
f_used += n;
p_used += n;
slot++;
}
seq += p_len;
/* The last segment may be less than gso_size. */
data_len -= p_len;
if (data_len < p_len)
p_len = data_len;
}
/* Flush the headers so they are ready for hardware DMA. */
wmb();
}
/* Pass all the data to mpipe for egress. */
static void tso_egress(struct net_device *dev, gxio_mpipe_equeue_t *equeue,
struct sk_buff *skb, unsigned char *headers, s64 slot)
{
struct skb_shared_info *sh = skb_shinfo(skb);
int instance = mpipe_instance(dev);
struct mpipe_data *md = &mpipe_data[instance];
unsigned int sh_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
unsigned int data_len = skb->len - sh_len;
unsigned int p_len = sh->gso_size;
gxio_mpipe_edesc_t edesc_head = { { 0 } };
gxio_mpipe_edesc_t edesc_body = { { 0 } };
long f_id = -1; /* id of the current fragment */
long f_size = skb_headlen(skb) - sh_len; /* current fragment size */
long f_used = 0; /* bytes used from the current fragment */
void *f_data = skb->data + sh_len;
long n; /* size of the current piece of payload */
unsigned long tx_packets = 0, tx_bytes = 0;
unsigned int csum_start;
int segment;
/* Prepare to egress the headers: set up header edesc. */
csum_start = skb_checksum_start_offset(skb);
edesc_head.csum = 1;
edesc_head.csum_start = csum_start;
edesc_head.csum_dest = csum_start + skb->csum_offset;
edesc_head.xfer_size = sh_len;
/* This is only used to specify the TLB. */
edesc_head.stack_idx = md->first_buffer_stack;
edesc_body.stack_idx = md->first_buffer_stack;
/* Egress all the edescs. */
for (segment = 0; segment < sh->gso_segs; segment++) {
unsigned char *buf;
unsigned int p_used = 0;
/* Egress the header. */
buf = headers + (slot % EQUEUE_ENTRIES) * HEADER_BYTES +
NET_IP_ALIGN;
edesc_head.va = va_to_tile_io_addr(buf);
gxio_mpipe_equeue_put_at(equeue, edesc_head, slot);
slot++;
/* Egress the payload. */
while (p_used < p_len) {
void *va;
/* Advance as needed. */
while (f_used >= f_size) {
f_id++;
f_size = skb_frag_size(&sh->frags[f_id]);
f_data = tile_net_frag_buf(&sh->frags[f_id]);
f_used = 0;
}
va = f_data + f_used;
/* Use bytes from the current fragment. */
n = p_len - p_used;
if (n > f_size - f_used)
n = f_size - f_used;
f_used += n;
p_used += n;
/* Egress a piece of the payload. */
edesc_body.va = va_to_tile_io_addr(va);
edesc_body.xfer_size = n;
edesc_body.bound = !(p_used < p_len);
gxio_mpipe_equeue_put_at(equeue, edesc_body, slot);
slot++;
}
tx_packets++;
tx_bytes += sh_len + p_len;
/* The last segment may be less than gso_size. */
data_len -= p_len;
if (data_len < p_len)
p_len = data_len;
}
/* Update stats. */
tile_net_stats_add(tx_packets, &dev->stats.tx_packets);
tile_net_stats_add(tx_bytes, &dev->stats.tx_bytes);
}
/* Do "TSO" handling for egress.
*
* Normally drivers set NETIF_F_TSO only to support hardware TSO;
* otherwise the stack uses scatter-gather to implement GSO in software.
* On our testing, enabling GSO support (via NETIF_F_SG) drops network
* performance down to around 7.5 Gbps on the 10G interfaces, although
* also dropping cpu utilization way down, to under 8%. But
* implementing "TSO" in the driver brings performance back up to line
* rate, while dropping cpu usage even further, to less than 4%. In
* practice, profiling of GSO shows that skb_segment() is what causes
* the performance overheads; we benefit in the driver from using
* preallocated memory to duplicate the TCP/IP headers.
*/
static int tile_net_tx_tso(struct sk_buff *skb, struct net_device *dev)
{
struct tile_net_info *info = this_cpu_ptr(&per_cpu_info);
struct tile_net_priv *priv = netdev_priv(dev);
int channel = priv->echannel;
int instance = priv->instance;
struct mpipe_data *md = &mpipe_data[instance];
struct tile_net_egress *egress = &md->egress_for_echannel[channel];
struct tile_net_comps *comps =
info->mpipe[instance].comps_for_echannel[channel];
gxio_mpipe_equeue_t *equeue = egress->equeue;
unsigned long irqflags;
int num_edescs;
s64 slot;
/* Determine how many mpipe edesc's are needed. */
num_edescs = tso_count_edescs(skb);
local_irq_save(irqflags);
/* Try to acquire a completion entry and an egress slot. */
slot = tile_net_equeue_try_reserve(dev, skb->queue_mapping, comps,
equeue, num_edescs);
if (slot < 0) {
local_irq_restore(irqflags);
return NETDEV_TX_BUSY;
}
/* Set up copies of header data properly. */
tso_headers_prepare(skb, egress->headers, slot);
/* Actually pass the data to the network hardware. */
tso_egress(dev, equeue, skb, egress->headers, slot);
/* Add a completion record. */
add_comp(equeue, comps, slot + num_edescs - 1, skb);
local_irq_restore(irqflags);
/* Make sure the egress timer is scheduled. */
tile_net_schedule_egress_timer();
return NETDEV_TX_OK;
}
/* Analyze the body and frags for a transmit request. */
static unsigned int tile_net_tx_frags(struct frag *frags,
struct sk_buff *skb,
void *b_data, unsigned int b_len)
{
unsigned int i, n = 0;
struct skb_shared_info *sh = skb_shinfo(skb);
if (b_len != 0) {
frags[n].buf = b_data;
frags[n++].length = b_len;
}
for (i = 0; i < sh->nr_frags; i++) {
skb_frag_t *f = &sh->frags[i];
frags[n].buf = tile_net_frag_buf(f);
frags[n++].length = skb_frag_size(f);
}
return n;
}
/* Help the kernel transmit a packet. */
static int tile_net_tx(struct sk_buff *skb, struct net_device *dev)
{
struct tile_net_info *info = this_cpu_ptr(&per_cpu_info);
struct tile_net_priv *priv = netdev_priv(dev);
int instance = priv->instance;
struct mpipe_data *md = &mpipe_data[instance];
struct tile_net_egress *egress =
&md->egress_for_echannel[priv->echannel];
gxio_mpipe_equeue_t *equeue = egress->equeue;
struct tile_net_comps *comps =
info->mpipe[instance].comps_for_echannel[priv->echannel];
unsigned int len = skb->len;
unsigned char *data = skb->data;
unsigned int num_edescs;
struct frag frags[MAX_FRAGS];
gxio_mpipe_edesc_t edescs[MAX_FRAGS];
unsigned long irqflags;
gxio_mpipe_edesc_t edesc = { { 0 } };
unsigned int i;
s64 slot;
if (skb_is_gso(skb))
return tile_net_tx_tso(skb, dev);
num_edescs = tile_net_tx_frags(frags, skb, data, skb_headlen(skb));
/* This is only used to specify the TLB. */
edesc.stack_idx = md->first_buffer_stack;
/* Prepare the edescs. */
for (i = 0; i < num_edescs; i++) {
edesc.xfer_size = frags[i].length;
edesc.va = va_to_tile_io_addr(frags[i].buf);
edescs[i] = edesc;
}
/* Mark the final edesc. */
edescs[num_edescs - 1].bound = 1;
/* Add checksum info to the initial edesc, if needed. */
if (skb->ip_summed == CHECKSUM_PARTIAL) {
unsigned int csum_start = skb_checksum_start_offset(skb);
edescs[0].csum = 1;
edescs[0].csum_start = csum_start;
edescs[0].csum_dest = csum_start + skb->csum_offset;
}
local_irq_save(irqflags);
/* Try to acquire a completion entry and an egress slot. */
slot = tile_net_equeue_try_reserve(dev, skb->queue_mapping, comps,
equeue, num_edescs);
if (slot < 0) {
local_irq_restore(irqflags);
return NETDEV_TX_BUSY;
}
for (i = 0; i < num_edescs; i++)
gxio_mpipe_equeue_put_at(equeue, edescs[i], slot++);
/* Store TX timestamp if needed. */
tile_tx_timestamp(skb, instance);
/* Add a completion record. */
add_comp(equeue, comps, slot - 1, skb);
/* NOTE: Use ETH_ZLEN for short packets (e.g. 42 < 60). */
tile_net_stats_add(1, &dev->stats.tx_packets);
tile_net_stats_add(max_t(unsigned int, len, ETH_ZLEN),
&dev->stats.tx_bytes);
local_irq_restore(irqflags);
/* Make sure the egress timer is scheduled. */
tile_net_schedule_egress_timer();
return NETDEV_TX_OK;
}
/* Return subqueue id on this core (one per core). */
static u16 tile_net_select_queue(struct net_device *dev, struct sk_buff *skb,
void *accel_priv, select_queue_fallback_t fallback)
{
return smp_processor_id();
}
/* Deal with a transmit timeout. */
static void tile_net_tx_timeout(struct net_device *dev)
{
int cpu;
for_each_online_cpu(cpu)
netif_wake_subqueue(dev, cpu);
}
/* Ioctl commands. */
static int tile_net_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
{
if (cmd == SIOCSHWTSTAMP)
return tile_hwtstamp_set(dev, rq);
if (cmd == SIOCGHWTSTAMP)
return tile_hwtstamp_get(dev, rq);
return -EOPNOTSUPP;
}
/* Change the Ethernet address of the NIC.
*
* The hypervisor driver does not support changing MAC address. However,
* the hardware does not do anything with the MAC address, so the address
* which gets used on outgoing packets, and which is accepted on incoming
* packets, is completely up to us.
*
* Returns 0 on success, negative on failure.
*/
static int tile_net_set_mac_address(struct net_device *dev, void *p)
{
struct sockaddr *addr = p;
if (!is_valid_ether_addr(addr->sa_data))
return -EINVAL;
memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
return 0;
}
#ifdef CONFIG_NET_POLL_CONTROLLER
/* Polling 'interrupt' - used by things like netconsole to send skbs
* without having to re-enable interrupts. It's not called while
* the interrupt routine is executing.
*/
static void tile_net_netpoll(struct net_device *dev)
{
int instance = mpipe_instance(dev);
struct tile_net_info *info = this_cpu_ptr(&per_cpu_info);
struct mpipe_data *md = &mpipe_data[instance];
disable_percpu_irq(md->ingress_irq);
napi_schedule(&info->mpipe[instance].napi);
enable_percpu_irq(md->ingress_irq, 0);
}
#endif
static const struct net_device_ops tile_net_ops = {
.ndo_open = tile_net_open,
.ndo_stop = tile_net_stop,
.ndo_start_xmit = tile_net_tx,
.ndo_select_queue = tile_net_select_queue,
.ndo_do_ioctl = tile_net_ioctl,
.ndo_tx_timeout = tile_net_tx_timeout,
.ndo_set_mac_address = tile_net_set_mac_address,
#ifdef CONFIG_NET_POLL_CONTROLLER
.ndo_poll_controller = tile_net_netpoll,
#endif
};
/* The setup function.
*
* This uses ether_setup() to assign various fields in dev, including
* setting IFF_BROADCAST and IFF_MULTICAST, then sets some extra fields.
*/
static void tile_net_setup(struct net_device *dev)
{
netdev_features_t features = 0;
ether_setup(dev);
dev->netdev_ops = &tile_net_ops;
dev->watchdog_timeo = TILE_NET_TIMEOUT;
/* MTU range: 68 - 1500 or 9000 */
dev->mtu = ETH_DATA_LEN;
dev->min_mtu = ETH_MIN_MTU;
dev->max_mtu = jumbo_num ? TILE_JUMBO_MAX_MTU : ETH_DATA_LEN;
features |= NETIF_F_HW_CSUM;
features |= NETIF_F_SG;
features |= NETIF_F_TSO;
features |= NETIF_F_TSO6;
dev->hw_features |= features;
dev->vlan_features |= features;
dev->features |= features;
}
/* Allocate the device structure, register the device, and obtain the
* MAC address from the hypervisor.
*/
static void tile_net_dev_init(const char *name, const uint8_t *mac)
{
int ret;
struct net_device *dev;
struct tile_net_priv *priv;
/* HACK: Ignore "loop" links. */
if (strncmp(name, "loop", 4) == 0)
return;
/* Allocate the device structure. Normally, "name" is a
* template, instantiated by register_netdev(), but not for us.
*/
dev = alloc_netdev_mqs(sizeof(*priv), name, NET_NAME_UNKNOWN,
tile_net_setup, NR_CPUS, 1);
if (!dev) {
pr_err("alloc_netdev_mqs(%s) failed\n", name);
return;
}
/* Initialize "priv". */
priv = netdev_priv(dev);
priv->dev = dev;
priv->channel = -1;
priv->loopify_channel = -1;
priv->echannel = -1;
init_ptp_dev(priv);
/* Get the MAC address and set it in the device struct; this must
* be done before the device is opened. If the MAC is all zeroes,
* we use a random address, since we're probably on the simulator.
*/
if (!is_zero_ether_addr(mac))
ether_addr_copy(dev->dev_addr, mac);
else
eth_hw_addr_random(dev);
/* Register the network device. */
ret = register_netdev(dev);
if (ret) {
netdev_err(dev, "register_netdev failed %d\n", ret);
free_netdev(dev);
return;
}
}
/* Per-cpu module initialization. */
static void tile_net_init_module_percpu(void *unused)
{
struct tile_net_info *info = this_cpu_ptr(&per_cpu_info);
int my_cpu = smp_processor_id();
int instance;
for (instance = 0; instance < NR_MPIPE_MAX; instance++) {
info->mpipe[instance].has_iqueue = false;
info->mpipe[instance].instance = instance;
}
info->my_cpu = my_cpu;
/* Initialize the egress timer. */
hrtimer_init(&info->egress_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
info->egress_timer.function = tile_net_handle_egress_timer;
}
/* Module initialization. */
static int __init tile_net_init_module(void)
{
int i;
char name[GXIO_MPIPE_LINK_NAME_LEN];
uint8_t mac[6];
pr_info("Tilera Network Driver\n");
BUILD_BUG_ON(NR_MPIPE_MAX != 2);
mutex_init(&tile_net_devs_for_channel_mutex);
/* Initialize each CPU. */
on_each_cpu(tile_net_init_module_percpu, NULL, 1);
/* Find out what devices we have, and initialize them. */
for (i = 0; gxio_mpipe_link_enumerate_mac(i, name, mac) >= 0; i++)
tile_net_dev_init(name, mac);
if (!network_cpus_init())
cpumask_and(&network_cpus_map,
housekeeping_cpumask(HK_FLAG_MISC), cpu_online_mask);
return 0;
}
module_init(tile_net_init_module);
drivers/net/ethernet/tile/tilepro.c deleted 100644 → 0
View file @ 0833f763
/*
* Copyright 2011 Tilera Corporation. 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, version 2.
*
* 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, GOOD TITLE or
* NON INFRINGEMENT. See the GNU General Public License for
* more details.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/moduleparam.h>
#include <linux/sched.h>
#include <linux/kernel.h> /* printk() */
#include <linux/slab.h> /* kmalloc() */
#include <linux/errno.h> /* error codes */
#include <linux/types.h> /* size_t */
#include <linux/interrupt.h>
#include <linux/in.h>
#include <linux/netdevice.h> /* struct device, and other headers */
#include <linux/etherdevice.h> /* eth_type_trans */
#include <linux/skbuff.h>
#include <linux/ioctl.h>
#include <linux/cdev.h>
#include <linux/hugetlb.h>
#include <linux/in6.h>
#include <linux/timer.h>
#include <linux/io.h>
#include <linux/u64_stats_sync.h>
#include <asm/checksum.h>
#include <asm/homecache.h>
#include <hv/drv_xgbe_intf.h>
#include <hv/drv_xgbe_impl.h>
#include <hv/hypervisor.h>
#include <hv/netio_intf.h>
/* For TSO */
#include <linux/ip.h>
#include <linux/tcp.h>
/*
* First, "tile_net_init_module()" initializes all four "devices" which
* can be used by linux.
*
* Then, "ifconfig DEVICE up" calls "tile_net_open()", which analyzes
* the network cpus, then uses "tile_net_open_aux()" to initialize
* LIPP/LEPP, and then uses "tile_net_open_inner()" to register all
* the tiles, provide buffers to LIPP, allow ingress to start, and
* turn on hypervisor interrupt handling (and NAPI) on all tiles.
*
* If registration fails due to the link being down, then "retry_work"
* is used to keep calling "tile_net_open_inner()" until it succeeds.
*
* If "ifconfig DEVICE down" is called, it uses "tile_net_stop()" to
* stop egress, drain the LIPP buffers, unregister all the tiles, stop
* LIPP/LEPP, and wipe the LEPP queue.
*
* We start out with the ingress interrupt enabled on each CPU. When
* this interrupt fires, we disable it, and call "napi_schedule()".
* This will cause "tile_net_poll()" to be called, which will pull
* packets from the netio queue, filtering them out, or passing them
* to "netif_receive_skb()". If our budget is exhausted, we will
* return, knowing we will be called again later. Otherwise, we
* reenable the ingress interrupt, and call "napi_complete()".
*
* HACK: Since disabling the ingress interrupt is not reliable, we
* ignore the interrupt if the global "active" flag is false.
*
*
* NOTE: The use of "native_driver" ensures that EPP exists, and that
* we are using "LIPP" and "LEPP".
*
* NOTE: Failing to free completions for an arbitrarily long time
* (which is defined to be illegal) does in fact cause bizarre
* problems. The "egress_timer" helps prevent this from happening.
*/
/* HACK: Allow use of "jumbo" packets. */
/* This should be 1500 if "jumbo" is not set in LIPP. */
/* This should be at most 10226 (10240 - 14) if "jumbo" is set in LIPP. */
/* ISSUE: This has not been thoroughly tested (except at 1500). */
#define TILE_NET_MTU ETH_DATA_LEN
/* HACK: Define this to verify incoming packets. */
/* #define TILE_NET_VERIFY_INGRESS */
/* Use 3000 to enable the Linux Traffic Control (QoS) layer, else 0. */
#define TILE_NET_TX_QUEUE_LEN 0
/* Define to dump packets (prints out the whole packet on tx and rx). */
/* #define TILE_NET_DUMP_PACKETS */
/* Define to enable debug spew (all PDEBUG's are enabled). */
/* #define TILE_NET_DEBUG */
/* Define to activate paranoia checks. */
/* #define TILE_NET_PARANOIA */
/* Default transmit lockup timeout period, in jiffies. */
#define TILE_NET_TIMEOUT (5 * HZ)
/* Default retry interval for bringing up the NetIO interface, in jiffies. */
#define TILE_NET_RETRY_INTERVAL (5 * HZ)
/* Number of ports (xgbe0, xgbe1, gbe0, gbe1). */
#define TILE_NET_DEVS 4
/* Paranoia. */
#if NET_IP_ALIGN != LIPP_PACKET_PADDING
#error "NET_IP_ALIGN must match LIPP_PACKET_PADDING."
#endif
/* Debug print. */
#ifdef TILE_NET_DEBUG
#define PDEBUG(fmt, args...) net_printk(fmt, ## args)
#else
#define PDEBUG(fmt, args...)
#endif
MODULE_AUTHOR("Tilera");
MODULE_LICENSE("GPL");
/*
* Queue of incoming packets for a specific cpu and device.
*
* Includes a pointer to the "system" data, and the actual "user" data.
*/
struct tile_netio_queue {
netio_queue_impl_t *__system_part;
netio_queue_user_impl_t __user_part;
};
/*
* Statistics counters for a specific cpu and device.
*/
struct tile_net_stats_t {
struct u64_stats_sync syncp;
u64 rx_packets; /* total packets received */
u64 tx_packets; /* total packets transmitted */
u64 rx_bytes; /* total bytes received */
u64 tx_bytes; /* total bytes transmitted */
u64 rx_errors; /* packets truncated or marked bad by hw */
u64 rx_dropped; /* packets not for us or intf not up */
};
/*
* Info for a specific cpu and device.
*
* ISSUE: There is a "dev" pointer in "napi" as well.
*/
struct tile_net_cpu {
/* The NAPI struct. */
struct napi_struct napi;
/* Packet queue. */
struct tile_netio_queue queue;
/* Statistics. */
struct tile_net_stats_t stats;
/* True iff NAPI is enabled. */
bool napi_enabled;
/* True if this tile has successfully registered with the IPP. */
bool registered;
/* True if the link was down last time we tried to register. */
bool link_down;
/* True if "egress_timer" is scheduled. */
bool egress_timer_scheduled;
/* Number of small sk_buffs which must still be provided. */
unsigned int num_needed_small_buffers;
/* Number of large sk_buffs which must still be provided. */
unsigned int num_needed_large_buffers;
/* A timer for handling egress completions. */
struct timer_list egress_timer;
};
/*
* Info for a specific device.
*/
struct tile_net_priv {
/* Our network device. */
struct net_device *dev;
/* Pages making up the egress queue. */
struct page *eq_pages;
/* Address of the actual egress queue. */
lepp_queue_t *eq;
/* Protects "eq". */
spinlock_t eq_lock;
/* The hypervisor handle for this interface. */
int hv_devhdl;
/* The intr bit mask that IDs this device. */
u32 intr_id;
/* True iff "tile_net_open_aux()" has succeeded. */
bool partly_opened;
/* True iff the device is "active". */
bool active;
/* Effective network cpus. */
struct cpumask network_cpus_map;
/* Number of network cpus. */
int network_cpus_count;
/* Credits per network cpu. */
int network_cpus_credits;
/* For NetIO bringup retries. */
struct delayed_work retry_work;
/* Quick access to per cpu data. */
struct tile_net_cpu *cpu[NR_CPUS];
};
/* Log2 of the number of small pages needed for the egress queue. */
#define EQ_ORDER get_order(sizeof(lepp_queue_t))
/* Size of the egress queue's pages. */
#define EQ_SIZE (1 << (PAGE_SHIFT + EQ_ORDER))
/*
* The actual devices (xgbe0, xgbe1, gbe0, gbe1).
*/
static struct net_device *tile_net_devs[TILE_NET_DEVS];
/*
* The "tile_net_cpu" structures for each device.
*/
static DEFINE_PER_CPU(struct tile_net_cpu, hv_xgbe0);
static DEFINE_PER_CPU(struct tile_net_cpu, hv_xgbe1);
static DEFINE_PER_CPU(struct tile_net_cpu, hv_gbe0);
static DEFINE_PER_CPU(struct tile_net_cpu, hv_gbe1);
/*
* True if "network_cpus" was specified.
*/
static bool network_cpus_used;
/*
* The actual cpus in "network_cpus".
*/
static struct cpumask network_cpus_map;
#ifdef TILE_NET_DEBUG
/*
* printk with extra stuff.
*
* We print the CPU we're running in brackets.
*/
static void net_printk(char *fmt, ...)
{
int i;
int len;
va_list args;
static char buf[256];
len = sprintf(buf, "tile_net[%2.2d]: ", smp_processor_id());
va_start(args, fmt);
i = vscnprintf(buf + len, sizeof(buf) - len - 1, fmt, args);
va_end(args);
buf[255] = '\0';
pr_notice(buf);
}
#endif
#ifdef TILE_NET_DUMP_PACKETS
/*
* Dump a packet.
*/
static void dump_packet(unsigned char *data, unsigned long length, char *s)
{
int my_cpu = smp_processor_id();
unsigned long i;
char buf[128];
static unsigned int count;
pr_info("dump_packet(data %p, length 0x%lx s %s count 0x%x)\n",
data, length, s, count++);
pr_info("\n");
for (i = 0; i < length; i++) {
if ((i & 0xf) == 0)
sprintf(buf, "[%02d] %8.8lx:", my_cpu, i);
sprintf(buf + strlen(buf), " %2.2x", data[i]);
if ((i & 0xf) == 0xf || i == length - 1) {
strcat(buf, "\n");
pr_info("%s", buf);
}
}
}
#endif
/*
* Provide support for the __netio_fastio1() swint
* (see <hv/drv_xgbe_intf.h> for how it is used).
*
* The fastio swint2 call may clobber all the caller-saved registers.
* It rarely clobbers memory, but we allow for the possibility in
* the signature just to be on the safe side.
*
* Also, gcc doesn't seem to allow an input operand to be
* clobbered, so we fake it with dummy outputs.
*
* This function can't be static because of the way it is declared
* in the netio header.
*/
inline int __netio_fastio1(u32 fastio_index, u32 arg0)
{
long result, clobber_r1, clobber_r10;
asm volatile("swint2"
: "=R00" (result),
"=R01" (clobber_r1), "=R10" (clobber_r10)
: "R10" (fastio_index), "R01" (arg0)
: "memory", "r2", "r3", "r4",
"r5", "r6", "r7", "r8", "r9",
"r11", "r12", "r13", "r14",
"r15", "r16", "r17", "r18", "r19",
"r20", "r21", "r22", "r23", "r24",
"r25", "r26", "r27", "r28", "r29");
return result;
}
static void tile_net_return_credit(struct tile_net_cpu *info)
{
struct tile_netio_queue *queue = &info->queue;
netio_queue_user_impl_t *qup = &queue->__user_part;
/* Return four credits after every fourth packet. */
if (--qup->__receive_credit_remaining == 0) {
u32 interval = qup->__receive_credit_interval;
qup->__receive_credit_remaining = interval;
__netio_fastio_return_credits(qup->__fastio_index, interval);
}
}
/*
* Provide a linux buffer to LIPP.
*/
static void tile_net_provide_linux_buffer(struct tile_net_cpu *info,
void *va, bool small)
{
struct tile_netio_queue *queue = &info->queue;
/* Convert "va" and "small" to "linux_buffer_t". */
unsigned int buffer = ((unsigned int)(__pa(va) >> 7) << 1) + small;
__netio_fastio_free_buffer(queue->__user_part.__fastio_index, buffer);
}
/*
* Provide a linux buffer for LIPP.
*
* Note that the ACTUAL allocation for each buffer is a "struct sk_buff",
* plus a chunk of memory that includes not only the requested bytes, but
* also NET_SKB_PAD bytes of initial padding, and a "struct skb_shared_info".
*
* Note that "struct skb_shared_info" is 88 bytes with 64K pages and
* 268 bytes with 4K pages (since the frags[] array needs 18 entries).
*
* Without jumbo packets, the maximum packet size will be 1536 bytes,
* and we use 2 bytes (NET_IP_ALIGN) of padding. ISSUE: If we told
* the hardware to clip at 1518 bytes instead of 1536 bytes, then we
* could save an entire cache line, but in practice, we don't need it.
*
* Since CPAs are 38 bits, and we can only encode the high 31 bits in
* a "linux_buffer_t", the low 7 bits must be zero, and thus, we must
* align the actual "va" mod 128.
*
* We assume that the underlying "head" will be aligned mod 64. Note
* that in practice, we have seen "head" NOT aligned mod 128 even when
* using 2048 byte allocations, which is surprising.
*
* If "head" WAS always aligned mod 128, we could change LIPP to
* assume that the low SIX bits are zero, and the 7th bit is one, that
* is, align the actual "va" mod 128 plus 64, which would be "free".
*
* For now, the actual "head" pointer points at NET_SKB_PAD bytes of
* padding, plus 28 or 92 bytes of extra padding, plus the sk_buff
* pointer, plus the NET_IP_ALIGN padding, plus 126 or 1536 bytes for
* the actual packet, plus 62 bytes of empty padding, plus some
* padding and the "struct skb_shared_info".
*
* With 64K pages, a large buffer thus needs 32+92+4+2+1536+62+88
* bytes, or 1816 bytes, which fits comfortably into 2048 bytes.
*
* With 64K pages, a small buffer thus needs 32+92+4+2+126+88
* bytes, or 344 bytes, which means we are wasting 64+ bytes, and
* could presumably increase the size of small buffers.
*
* With 4K pages, a large buffer thus needs 32+92+4+2+1536+62+268
* bytes, or 1996 bytes, which fits comfortably into 2048 bytes.
*
* With 4K pages, a small buffer thus needs 32+92+4+2+126+268
* bytes, or 524 bytes, which is annoyingly wasteful.
*
* Maybe we should increase LIPP_SMALL_PACKET_SIZE to 192?
*
* ISSUE: Maybe we should increase "NET_SKB_PAD" to 64?
*/
static bool tile_net_provide_needed_buffer(struct tile_net_cpu *info,
bool small)
{
#if TILE_NET_MTU <= 1536
/* Without "jumbo", 2 + 1536 should be sufficient. */
unsigned int large_size = NET_IP_ALIGN + 1536;
#else
/* ISSUE: This has not been tested. */
unsigned int large_size = NET_IP_ALIGN + TILE_NET_MTU + 100;
#endif
/* Avoid "false sharing" with last cache line. */
/* ISSUE: This is already done by "netdev_alloc_skb()". */
unsigned int len =
(((small ? LIPP_SMALL_PACKET_SIZE : large_size) +
CHIP_L2_LINE_SIZE() - 1) & -CHIP_L2_LINE_SIZE());
unsigned int padding = 128 - NET_SKB_PAD;
unsigned int align;
struct sk_buff *skb;
void *va;
struct sk_buff **skb_ptr;
/* Request 96 extra bytes for alignment purposes. */
skb = netdev_alloc_skb(info->napi.dev, len + padding);
if (skb == NULL)
return false;
/* Skip 32 or 96 bytes to align "data" mod 128. */
align = -(long)skb->data & (128 - 1);
BUG_ON(align > padding);
skb_reserve(skb, align);
/* This address is given to IPP. */
va = skb->data;
/* Buffers must not span a huge page. */
BUG_ON(((((long)va & ~HPAGE_MASK) + len) & HPAGE_MASK) != 0);
#ifdef TILE_NET_PARANOIA
#if CHIP_HAS_CBOX_HOME_MAP()
if (hash_default) {
HV_PTE pte = *virt_to_pte(current->mm, (unsigned long)va);
if (hv_pte_get_mode(pte) != HV_PTE_MODE_CACHE_HASH_L3)
panic("Non-HFH ingress buffer! VA=%p Mode=%d PTE=%llx",
va, hv_pte_get_mode(pte), hv_pte_val(pte));
}
#endif
#endif
/* Invalidate the packet buffer. */
if (!hash_default)
__inv_buffer(va, len);
/* Skip two bytes to satisfy LIPP assumptions. */
/* Note that this aligns IP on a 16 byte boundary. */
/* ISSUE: Do this when the packet arrives? */
skb_reserve(skb, NET_IP_ALIGN);
/* Save a back-pointer to 'skb'. */
skb_ptr = va - sizeof(*skb_ptr);
*skb_ptr = skb;
/* Make sure "skb_ptr" has been flushed. */
__insn_mf();
/* Provide the new buffer. */
tile_net_provide_linux_buffer(info, va, small);
return true;
}
/*
* Provide linux buffers for LIPP.
*/
static void tile_net_provide_needed_buffers(struct tile_net_cpu *info)
{
while (info->num_needed_small_buffers != 0) {
if (!tile_net_provide_needed_buffer(info, true))
goto oops;
info->num_needed_small_buffers--;
}
while (info->num_needed_large_buffers != 0) {
if (!tile_net_provide_needed_buffer(info, false))
goto oops;
info->num_needed_large_buffers--;
}
return;
oops:
/* Add a description to the page allocation failure dump. */
pr_notice("Could not provide a linux buffer to LIPP.\n");
}
/*
* Grab some LEPP completions, and store them in "comps", of size
* "comps_size", and return the number of completions which were
* stored, so the caller can free them.
*/
static unsigned int tile_net_lepp_grab_comps(lepp_queue_t *eq,
struct sk_buff *comps[],
unsigned int comps_size,
unsigned int min_size)
{
unsigned int n = 0;
unsigned int comp_head = eq->comp_head;
unsigned int comp_busy = eq->comp_busy;
while (comp_head != comp_busy && n < comps_size) {
comps[n++] = eq->comps[comp_head];
LEPP_QINC(comp_head);
}
if (n < min_size)
return 0;
eq->comp_head = comp_head;
return n;
}
/*
* Free some comps, and return true iff there are still some pending.
*/
static bool tile_net_lepp_free_comps(struct net_device *dev, bool all)
{
struct tile_net_priv *priv = netdev_priv(dev);
lepp_queue_t *eq = priv->eq;
struct sk_buff *olds[64];
unsigned int wanted = 64;
unsigned int i, n;
bool pending;
spin_lock(&priv->eq_lock);
if (all)
eq->comp_busy = eq->comp_tail;
n = tile_net_lepp_grab_comps(eq, olds, wanted, 0);
pending = (eq->comp_head != eq->comp_tail);
spin_unlock(&priv->eq_lock);
for (i = 0; i < n; i++)
kfree_skb(olds[i]);
return pending;
}
/*
* Make sure the egress timer is scheduled.
*
* Note that we use "schedule if not scheduled" logic instead of the more
* obvious "reschedule" logic, because "reschedule" is fairly expensive.
*/
static void tile_net_schedule_egress_timer(struct tile_net_cpu *info)
{
if (!info->egress_timer_scheduled) {
mod_timer(&info->egress_timer, jiffies + 1);
info->egress_timer_scheduled = true;
}
}
/*
* The "function" for "info->egress_timer".
*
* This timer will reschedule itself as long as there are any pending
* completions expected (on behalf of any tile).
*
* ISSUE: Realistically, will the timer ever stop scheduling itself?
*
* ISSUE: This timer is almost never actually needed, so just use a global
* timer that can run on any tile.
*
* ISSUE: Maybe instead track number of expected completions, and free
* only that many, resetting to zero if "pending" is ever false.
*/
static void tile_net_handle_egress_timer(struct timer_list *t)
{
struct tile_net_cpu *info = from_timer(info, t, egress_timer);
struct net_device *dev = info->napi.dev;
/* The timer is no longer scheduled. */
info->egress_timer_scheduled = false;
/* Free comps, and reschedule timer if more are pending. */
if (tile_net_lepp_free_comps(dev, false))
tile_net_schedule_egress_timer(info);
}
static void tile_net_discard_aux(struct tile_net_cpu *info, int index)
{
struct tile_netio_queue *queue = &info->queue;
netio_queue_impl_t *qsp = queue->__system_part;
netio_queue_user_impl_t *qup = &queue->__user_part;
int index2_aux = index + sizeof(netio_pkt_t);
int index2 =
((index2_aux ==
qsp->__packet_receive_queue.__last_packet_plus_one) ?
0 : index2_aux);
netio_pkt_t *pkt = (netio_pkt_t *)((unsigned long) &qsp[1] + index);
/* Extract the "linux_buffer_t". */
unsigned int buffer = pkt->__packet.word;
/* Convert "linux_buffer_t" to "va". */
void *va = __va((phys_addr_t)(buffer >> 1) << 7);
/* Acquire the associated "skb". */
struct sk_buff **skb_ptr = va - sizeof(*skb_ptr);
struct sk_buff *skb = *skb_ptr;
kfree_skb(skb);
/* Consume this packet. */
qup->__packet_receive_read = index2;
}
/*
* Like "tile_net_poll()", but just discard packets.
*/
static void tile_net_discard_packets(struct net_device *dev)
{
struct tile_net_priv *priv = netdev_priv(dev);
int my_cpu = smp_processor_id();
struct tile_net_cpu *info = priv->cpu[my_cpu];
struct tile_netio_queue *queue = &info->queue;
netio_queue_impl_t *qsp = queue->__system_part;
netio_queue_user_impl_t *qup = &queue->__user_part;
while (qup->__packet_receive_read !=
qsp->__packet_receive_queue.__packet_write) {
int index = qup->__packet_receive_read;
tile_net_discard_aux(info, index);
}
}
/*
* Handle the next packet. Return true if "processed", false if "filtered".
*/
static bool tile_net_poll_aux(struct tile_net_cpu *info, int index)
{
struct net_device *dev = info->napi.dev;
struct tile_netio_queue *queue = &info->queue;
netio_queue_impl_t *qsp = queue->__system_part;
netio_queue_user_impl_t *qup = &queue->__user_part;
struct tile_net_stats_t *stats = &info->stats;
int filter;
int index2_aux = index + sizeof(netio_pkt_t);
int index2 =
((index2_aux ==
qsp->__packet_receive_queue.__last_packet_plus_one) ?
0 : index2_aux);
netio_pkt_t *pkt = (netio_pkt_t *)((unsigned long) &qsp[1] + index);
netio_pkt_metadata_t *metadata = NETIO_PKT_METADATA(pkt);
netio_pkt_status_t pkt_status = NETIO_PKT_STATUS_M(metadata, pkt);
/* Extract the packet size. FIXME: Shouldn't the second line */
/* get subtracted? Mostly moot, since it should be "zero". */
unsigned long len =
(NETIO_PKT_CUSTOM_LENGTH(pkt) +
NET_IP_ALIGN - NETIO_PACKET_PADDING);
/* Extract the "linux_buffer_t". */
unsigned int buffer = pkt->__packet.word;
/* Extract "small" (vs "large"). */
bool small = ((buffer & 1) != 0);
/* Convert "linux_buffer_t" to "va". */
void *va = __va((phys_addr_t)(buffer >> 1) << 7);
/* Extract the packet data pointer. */
/* Compare to "NETIO_PKT_CUSTOM_DATA(pkt)". */
unsigned char *buf = va + NET_IP_ALIGN;
/* Invalidate the packet buffer. */
if (!hash_default)
__inv_buffer(buf, len);
#ifdef TILE_NET_DUMP_PACKETS
dump_packet(buf, len, "rx");
#endif /* TILE_NET_DUMP_PACKETS */
#ifdef TILE_NET_VERIFY_INGRESS
if (pkt_status == NETIO_PKT_STATUS_OVERSIZE && len >= 64) {
dump_packet(buf, len, "rx");
panic("Unexpected OVERSIZE.");
}
#endif
filter = 0;
if (pkt_status == NETIO_PKT_STATUS_BAD) {
/* Handle CRC error and hardware truncation. */
filter = 2;
} else if (!(dev->flags & IFF_UP)) {
/* Filter packets received before we're up. */
filter = 1;
} else if (NETIO_PKT_ETHERTYPE_RECOGNIZED_M(metadata, pkt) &&
pkt_status == NETIO_PKT_STATUS_UNDERSIZE) {
/* Filter "truncated" packets. */
filter = 2;
} else if (!(dev->flags & IFF_PROMISC)) {
if (!is_multicast_ether_addr(buf)) {
/* Filter packets not for our address. */
const u8 *mine = dev->dev_addr;
filter = !ether_addr_equal(mine, buf);
}
}
u64_stats_update_begin(&stats->syncp);
if (filter != 0) {
if (filter == 1)
stats->rx_dropped++;
else
stats->rx_errors++;
tile_net_provide_linux_buffer(info, va, small);
} else {
/* Acquire the associated "skb". */
struct sk_buff **skb_ptr = va - sizeof(*skb_ptr);
struct sk_buff *skb = *skb_ptr;
/* Paranoia. */
if (skb->data != buf)
panic("Corrupt linux buffer from LIPP! "
"VA=%p, skb=%p, skb->data=%p\n",
va, skb, skb->data);
/* Encode the actual packet length. */
skb_put(skb, len);
/* NOTE: This call also sets "skb->dev = dev". */
skb->protocol = eth_type_trans(skb, dev);
/* Avoid recomputing "good" TCP/UDP checksums. */
if (NETIO_PKT_L4_CSUM_CORRECT_M(metadata, pkt))
skb->ip_summed = CHECKSUM_UNNECESSARY;
netif_receive_skb(skb);
stats->rx_packets++;
stats->rx_bytes += len;
}
u64_stats_update_end(&stats->syncp);
/* ISSUE: It would be nice to defer this until the packet has */
/* actually been processed. */
tile_net_return_credit(info);
/* Consume this packet. */
qup->__packet_receive_read = index2;
return !filter;
}
/*
* Handle some packets for the given device on the current CPU.
*
* If "tile_net_stop()" is called on some other tile while this
* function is running, we will return, hopefully before that
* other tile asks us to call "napi_disable()".
*
* The "rotting packet" race condition occurs if a packet arrives
* during the extremely narrow window between the queue appearing to
* be empty, and the ingress interrupt being re-enabled. This happens
* a LOT under heavy network load.
*/
static int tile_net_poll(struct napi_struct *napi, int budget)
{
struct net_device *dev = napi->dev;
struct tile_net_priv *priv = netdev_priv(dev);
int my_cpu = smp_processor_id();
struct tile_net_cpu *info = priv->cpu[my_cpu];
struct tile_netio_queue *queue = &info->queue;
netio_queue_impl_t *qsp = queue->__system_part;
netio_queue_user_impl_t *qup = &queue->__user_part;
unsigned int work = 0;
if (budget <= 0)
goto done;
while (priv->active) {
int index = qup->__packet_receive_read;
if (index == qsp->__packet_receive_queue.__packet_write)
break;
if (tile_net_poll_aux(info, index)) {
if (++work >= budget)
goto done;
}
}
napi_complete_done(&info->napi, work);
if (!priv->active)
goto done;
/* Re-enable the ingress interrupt. */
enable_percpu_irq(priv->intr_id, 0);
/* HACK: Avoid the "rotting packet" problem (see above). */
if (qup->__packet_receive_read !=
qsp->__packet_receive_queue.__packet_write) {
/* ISSUE: Sometimes this returns zero, presumably */
/* because an interrupt was handled for this tile. */
(void)napi_reschedule(&info->napi);
}
done:
if (priv->active)
tile_net_provide_needed_buffers(info);
return work;
}
/*
* Handle an ingress interrupt for the given device on the current cpu.
*
* ISSUE: Sometimes this gets called after "disable_percpu_irq()" has
* been called! This is probably due to "pending hypervisor downcalls".
*
* ISSUE: Is there any race condition between the "napi_schedule()" here
* and the "napi_complete()" call above?
*/
static irqreturn_t tile_net_handle_ingress_interrupt(int irq, void *dev_ptr)
{
struct net_device *dev = (struct net_device *)dev_ptr;
struct tile_net_priv *priv = netdev_priv(dev);
int my_cpu = smp_processor_id();
struct tile_net_cpu *info = priv->cpu[my_cpu];
/* Disable the ingress interrupt. */
disable_percpu_irq(priv->intr_id);
/* Ignore unwanted interrupts. */
if (!priv->active)
return IRQ_HANDLED;
/* ISSUE: Sometimes "info->napi_enabled" is false here. */
napi_schedule(&info->napi);
return IRQ_HANDLED;
}
/*
* One time initialization per interface.
*/
static int tile_net_open_aux(struct net_device *dev)
{
struct tile_net_priv *priv = netdev_priv(dev);
int ret;
int dummy;
unsigned int epp_lotar;
/*
* Find out where EPP memory should be homed.
*/
ret = hv_dev_pread(priv->hv_devhdl, 0,
(HV_VirtAddr)&epp_lotar, sizeof(epp_lotar),
NETIO_EPP_SHM_OFF);
if (ret < 0) {
pr_err("could not read epp_shm_queue lotar.\n");
return -EIO;
}
/*
* Home the page on the EPP.
*/
{
int epp_home = hv_lotar_to_cpu(epp_lotar);
homecache_change_page_home(priv->eq_pages, EQ_ORDER, epp_home);
}
/*
* Register the EPP shared memory queue.
*/
{
netio_ipp_address_t ea = {
.va = 0,
.pa = __pa(priv->eq),
.pte = hv_pte(0),
.size = EQ_SIZE,
};
ea.pte = hv_pte_set_lotar(ea.pte, epp_lotar);
ea.pte = hv_pte_set_mode(ea.pte, HV_PTE_MODE_CACHE_TILE_L3);
ret = hv_dev_pwrite(priv->hv_devhdl, 0,
(HV_VirtAddr)&ea,
sizeof(ea),
NETIO_EPP_SHM_OFF);
if (ret < 0)
return -EIO;
}
/*
* Start LIPP/LEPP.
*/
if (hv_dev_pwrite(priv->hv_devhdl, 0, (HV_VirtAddr)&dummy,
sizeof(dummy), NETIO_IPP_START_SHIM_OFF) < 0) {
pr_warn("Failed to start LIPP/LEPP\n");
return -EIO;
}
return 0;
}
/*
* Register with hypervisor on the current CPU.
*
* Strangely, this function does important things even if it "fails",
* which is especially common if the link is not up yet. Hopefully
* these things are all "harmless" if done twice!
*/
static void tile_net_register(void *dev_ptr)
{
struct net_device *dev = (struct net_device *)dev_ptr;
struct tile_net_priv *priv = netdev_priv(dev);
int my_cpu = smp_processor_id();
struct tile_net_cpu *info;
struct tile_netio_queue *queue;
/* Only network cpus can receive packets. */
int queue_id =
cpumask_test_cpu(my_cpu, &priv->network_cpus_map) ? 0 : 255;
netio_input_config_t config = {
.flags = 0,
.num_receive_packets = priv->network_cpus_credits,
.queue_id = queue_id
};
int ret = 0;
netio_queue_impl_t *queuep;
PDEBUG("tile_net_register(queue_id %d)\n", queue_id);
if (!strcmp(dev->name, "xgbe0"))
info = this_cpu_ptr(&hv_xgbe0);
else if (!strcmp(dev->name, "xgbe1"))
info = this_cpu_ptr(&hv_xgbe1);
else if (!strcmp(dev->name, "gbe0"))
info = this_cpu_ptr(&hv_gbe0);
else if (!strcmp(dev->name, "gbe1"))
info = this_cpu_ptr(&hv_gbe1);
else
BUG();
/* Initialize the egress timer. */
timer_setup(&info->egress_timer, tile_net_handle_egress_timer,
TIMER_PINNED);
u64_stats_init(&info->stats.syncp);
priv->cpu[my_cpu] = info;
/*
* Register ourselves with LIPP. This does a lot of stuff,
* including invoking the LIPP registration code.
*/
ret = hv_dev_pwrite(priv->hv_devhdl, 0,
(HV_VirtAddr)&config,
sizeof(netio_input_config_t),
NETIO_IPP_INPUT_REGISTER_OFF);
PDEBUG("hv_dev_pwrite(NETIO_IPP_INPUT_REGISTER_OFF) returned %d\n",
ret);
if (ret < 0) {
if (ret != NETIO_LINK_DOWN) {
printk(KERN_DEBUG "hv_dev_pwrite "
"NETIO_IPP_INPUT_REGISTER_OFF failure %d\n",
ret);
}
info->link_down = (ret == NETIO_LINK_DOWN);
return;
}
/*
* Get the pointer to our queue's system part.
*/
ret = hv_dev_pread(priv->hv_devhdl, 0,
(HV_VirtAddr)&queuep,
sizeof(netio_queue_impl_t *),
NETIO_IPP_INPUT_REGISTER_OFF);
PDEBUG("hv_dev_pread(NETIO_IPP_INPUT_REGISTER_OFF) returned %d\n",
ret);
PDEBUG("queuep %p\n", queuep);
if (ret <= 0) {
/* ISSUE: Shouldn't this be a fatal error? */
pr_err("hv_dev_pread NETIO_IPP_INPUT_REGISTER_OFF failure\n");
return;
}
queue = &info->queue;
queue->__system_part = queuep;
memset(&queue->__user_part, 0, sizeof(netio_queue_user_impl_t));
/* This is traditionally "config.num_receive_packets / 2". */
queue->__user_part.__receive_credit_interval = 4;
queue->__user_part.__receive_credit_remaining =
queue->__user_part.__receive_credit_interval;
/*
* Get a fastio index from the hypervisor.
* ISSUE: Shouldn't this check the result?
*/
ret = hv_dev_pread(priv->hv_devhdl, 0,
(HV_VirtAddr)&queue->__user_part.__fastio_index,
sizeof(queue->__user_part.__fastio_index),
NETIO_IPP_GET_FASTIO_OFF);
PDEBUG("hv_dev_pread(NETIO_IPP_GET_FASTIO_OFF) returned %d\n", ret);
/* Now we are registered. */
info->registered = true;
}
/*
* Deregister with hypervisor on the current CPU.
*
* This simply discards all our credits, so no more packets will be
* delivered to this tile. There may still be packets in our queue.
*
* Also, disable the ingress interrupt.
*/
static void tile_net_deregister(void *dev_ptr)
{
struct net_device *dev = (struct net_device *)dev_ptr;
struct tile_net_priv *priv = netdev_priv(dev);
int my_cpu = smp_processor_id();
struct tile_net_cpu *info = priv->cpu[my_cpu];
/* Disable the ingress interrupt. */
disable_percpu_irq(priv->intr_id);
/* Do nothing else if not registered. */
if (info == NULL || !info->registered)
return;
{
struct tile_netio_queue *queue = &info->queue;
netio_queue_user_impl_t *qup = &queue->__user_part;
/* Discard all our credits. */
__netio_fastio_return_credits(qup->__fastio_index, -1);
}
}
/*
* Unregister with hypervisor on the current CPU.
*
* Also, disable the ingress interrupt.
*/
static void tile_net_unregister(void *dev_ptr)
{
struct net_device *dev = (struct net_device *)dev_ptr;
struct tile_net_priv *priv = netdev_priv(dev);
int my_cpu = smp_processor_id();
struct tile_net_cpu *info = priv->cpu[my_cpu];
int ret;
int dummy = 0;
/* Disable the ingress interrupt. */
disable_percpu_irq(priv->intr_id);
/* Do nothing else if not registered. */
if (info == NULL || !info->registered)
return;
/* Unregister ourselves with LIPP/LEPP. */
ret = hv_dev_pwrite(priv->hv_devhdl, 0, (HV_VirtAddr)&dummy,
sizeof(dummy), NETIO_IPP_INPUT_UNREGISTER_OFF);
if (ret < 0)
panic("Failed to unregister with LIPP/LEPP!\n");
/* Discard all packets still in our NetIO queue. */
tile_net_discard_packets(dev);
/* Reset state. */
info->num_needed_small_buffers = 0;
info->num_needed_large_buffers = 0;
/* Cancel egress timer. */
del_timer(&info->egress_timer);
info->egress_timer_scheduled = false;
}
/*
* Helper function for "tile_net_stop()".
*
* Also used to handle registration failure in "tile_net_open_inner()",
* when the various extra steps in "tile_net_stop()" are not necessary.
*/
static void tile_net_stop_aux(struct net_device *dev)
{
struct tile_net_priv *priv = netdev_priv(dev);
int i;
int dummy = 0;
/*
* Unregister all tiles, so LIPP will stop delivering packets.
* Also, delete all the "napi" objects (sequentially, to protect
* "dev->napi_list").
*/
on_each_cpu(tile_net_unregister, (void *)dev, 1);
for_each_online_cpu(i) {
struct tile_net_cpu *info = priv->cpu[i];
if (info != NULL && info->registered) {
netif_napi_del(&info->napi);
info->registered = false;
}
}
/* Stop LIPP/LEPP. */
if (hv_dev_pwrite(priv->hv_devhdl, 0, (HV_VirtAddr)&dummy,
sizeof(dummy), NETIO_IPP_STOP_SHIM_OFF) < 0)
panic("Failed to stop LIPP/LEPP!\n");
priv->partly_opened = false;
}
/*
* Disable NAPI for the given device on the current cpu.
*/
static void tile_net_stop_disable(void *dev_ptr)
{
struct net_device *dev = (struct net_device *)dev_ptr;
struct tile_net_priv *priv = netdev_priv(dev);
int my_cpu = smp_processor_id();
struct tile_net_cpu *info = priv->cpu[my_cpu];
/* Disable NAPI if needed. */
if (info != NULL && info->napi_enabled) {
napi_disable(&info->napi);
info->napi_enabled = false;
}
}
/*
* Enable NAPI and the ingress interrupt for the given device
* on the current cpu.
*
* ISSUE: Only do this for "network cpus"?
*/
static void tile_net_open_enable(void *dev_ptr)
{
struct net_device *dev = (struct net_device *)dev_ptr;
struct tile_net_priv *priv = netdev_priv(dev);
int my_cpu = smp_processor_id();
struct tile_net_cpu *info = priv->cpu[my_cpu];
/* Enable NAPI. */
napi_enable(&info->napi);
info->napi_enabled = true;
/* Enable the ingress interrupt. */
enable_percpu_irq(priv->intr_id, 0);
}
/*
* tile_net_open_inner does most of the work of bringing up the interface.
* It's called from tile_net_open(), and also from tile_net_retry_open().
* The return value is 0 if the interface was brought up, < 0 if
* tile_net_open() should return the return value as an error, and > 0 if
* tile_net_open() should return success and schedule a work item to
* periodically retry the bringup.
*/
static int tile_net_open_inner(struct net_device *dev)
{
struct tile_net_priv *priv = netdev_priv(dev);
int my_cpu = smp_processor_id();
struct tile_net_cpu *info;
struct tile_netio_queue *queue;
int result = 0;
int i;
int dummy = 0;
/*
* First try to register just on the local CPU, and handle any
* semi-expected "link down" failure specially. Note that we
* do NOT call "tile_net_stop_aux()", unlike below.
*/
tile_net_register(dev);
info = priv->cpu[my_cpu];
if (!info->registered) {
if (info->link_down)
return 1;
return -EAGAIN;
}
/*
* Now register everywhere else. If any registration fails,
* even for "link down" (which might not be possible), we
* clean up using "tile_net_stop_aux()". Also, add all the
* "napi" objects (sequentially, to protect "dev->napi_list").
* ISSUE: Only use "netif_napi_add()" for "network cpus"?
*/
smp_call_function(tile_net_register, (void *)dev, 1);
for_each_online_cpu(i) {
struct tile_net_cpu *info = priv->cpu[i];
if (info->registered)
netif_napi_add(dev, &info->napi, tile_net_poll, 64);
else
result = -EAGAIN;
}
if (result != 0) {
tile_net_stop_aux(dev);
return result;
}
queue = &info->queue;
if (priv->intr_id == 0) {
unsigned int irq;
/*
* Acquire the irq allocated by the hypervisor. Every
* queue gets the same irq. The "__intr_id" field is
* "1 << irq", so we use "__ffs()" to extract "irq".
*/
priv->intr_id = queue->__system_part->__intr_id;
BUG_ON(priv->intr_id == 0);
irq = __ffs(priv->intr_id);
/*
* Register the ingress interrupt handler for this
* device, permanently.
*
* We used to call "free_irq()" in "tile_net_stop()",
* and then re-register the handler here every time,
* but that caused DNP errors in "handle_IRQ_event()"
* because "desc->action" was NULL. See bug 9143.
*/
tile_irq_activate(irq, TILE_IRQ_PERCPU);
BUG_ON(request_irq(irq, tile_net_handle_ingress_interrupt,
0, dev->name, (void *)dev) != 0);
}
{
/* Allocate initial buffers. */
int max_buffers =
priv->network_cpus_count * priv->network_cpus_credits;
info->num_needed_small_buffers =
min(LIPP_SMALL_BUFFERS, max_buffers);
info->num_needed_large_buffers =
min(LIPP_LARGE_BUFFERS, max_buffers);
tile_net_provide_needed_buffers(info);
if (info->num_needed_small_buffers != 0 ||
info->num_needed_large_buffers != 0)
panic("Insufficient memory for buffer stack!");
}
/* We are about to be active. */
priv->active = true;
/* Make sure "active" is visible to all tiles. */
mb();
/* On each tile, enable NAPI and the ingress interrupt. */
on_each_cpu(tile_net_open_enable, (void *)dev, 1);
/* Start LIPP/LEPP and activate "ingress" at the shim. */
if (hv_dev_pwrite(priv->hv_devhdl, 0, (HV_VirtAddr)&dummy,
sizeof(dummy), NETIO_IPP_INPUT_INIT_OFF) < 0)
panic("Failed to activate the LIPP Shim!\n");
/* Start our transmit queue. */
netif_start_queue(dev);
return 0;
}
/*
* Called periodically to retry bringing up the NetIO interface,
* if it doesn't come up cleanly during tile_net_open().
*/
static void tile_net_open_retry(struct work_struct *w)
{
struct delayed_work *dw = to_delayed_work(w);
struct tile_net_priv *priv =
container_of(dw, struct tile_net_priv, retry_work);
/*
* Try to bring the NetIO interface up. If it fails, reschedule
* ourselves to try again later; otherwise, tell Linux we now have
* a working link. ISSUE: What if the return value is negative?
*/
if (tile_net_open_inner(priv->dev) != 0)
schedule_delayed_work(&priv->retry_work,
TILE_NET_RETRY_INTERVAL);
else
netif_carrier_on(priv->dev);
}
/*
* Called when a network interface is made active.
*
* Returns 0 on success, negative value on failure.
*
* The open entry point is called when a network interface is made
* active by the system (IFF_UP). At this point all resources needed
* for transmit and receive operations are allocated, the interrupt
* handler is registered with the OS (if needed), the watchdog timer
* is started, and the stack is notified that the interface is ready.
*
* If the actual link is not available yet, then we tell Linux that
* we have no carrier, and we keep checking until the link comes up.
*/
static int tile_net_open(struct net_device *dev)
{
int ret = 0;
struct tile_net_priv *priv = netdev_priv(dev);
/*
* We rely on priv->partly_opened to tell us if this is the
* first time this interface is being brought up. If it is
* set, the IPP was already initialized and should not be
* initialized again.
*/
if (!priv->partly_opened) {
int count;
int credits;
/* Initialize LIPP/LEPP, and start the Shim. */
ret = tile_net_open_aux(dev);
if (ret < 0) {
pr_err("tile_net_open_aux failed: %d\n", ret);
return ret;
}
/* Analyze the network cpus. */
if (network_cpus_used)
cpumask_copy(&priv->network_cpus_map,
&network_cpus_map);
else
cpumask_copy(&priv->network_cpus_map, cpu_online_mask);
count = cpumask_weight(&priv->network_cpus_map);
/* Limit credits to available buffers, and apply min. */
credits = max(16, (LIPP_LARGE_BUFFERS / count) & ~1);
/* Apply "GBE" max limit. */
/* ISSUE: Use higher limit for XGBE? */
credits = min(NETIO_MAX_RECEIVE_PKTS, credits);
priv->network_cpus_count = count;
priv->network_cpus_credits = credits;
#ifdef TILE_NET_DEBUG
pr_info("Using %d network cpus, with %d credits each\n",
priv->network_cpus_count, priv->network_cpus_credits);
#endif
priv->partly_opened = true;
} else {
/* FIXME: Is this possible? */
/* printk("Already partly opened.\n"); */
}
/*
* Attempt to bring up the link.
*/
ret = tile_net_open_inner(dev);
if (ret <= 0) {
if (ret == 0)
netif_carrier_on(dev);
return ret;
}
/*
* We were unable to bring up the NetIO interface, but we want to
* try again in a little bit. Tell Linux that we have no carrier
* so it doesn't try to use the interface before the link comes up
* and then remember to try again later.
*/
netif_carrier_off(dev);
schedule_delayed_work(&priv->retry_work, TILE_NET_RETRY_INTERVAL);
return 0;
}
static int tile_net_drain_lipp_buffers(struct tile_net_priv *priv)
{
int n = 0;
/* Drain all the LIPP buffers. */
while (true) {
unsigned int buffer;
/* NOTE: This should never fail. */
if (hv_dev_pread(priv->hv_devhdl, 0, (HV_VirtAddr)&buffer,
sizeof(buffer), NETIO_IPP_DRAIN_OFF) < 0)
break;
/* Stop when done. */
if (buffer == 0)
break;
{
/* Convert "linux_buffer_t" to "va". */
void *va = __va((phys_addr_t)(buffer >> 1) << 7);
/* Acquire the associated "skb". */
struct sk_buff **skb_ptr = va - sizeof(*skb_ptr);
struct sk_buff *skb = *skb_ptr;
kfree_skb(skb);
}
n++;
}
return n;
}
/*
* Disables a network interface.
*
* Returns 0, this is not allowed to fail.
*
* The close entry point is called when an interface is de-activated
* by the OS. The hardware is still under the drivers control, but
* needs to be disabled. A global MAC reset is issued to stop the
* hardware, and all transmit and receive resources are freed.
*
* ISSUE: How closely does "netif_running(dev)" mirror "priv->active"?
*
* Before we are called by "__dev_close()", "netif_running()" will
* have been cleared, so no NEW calls to "tile_net_poll()" will be
* made by "netpoll_poll_dev()".
*
* Often, this can cause some tiles to still have packets in their
* queues, so we must call "tile_net_discard_packets()" later.
*
* Note that some other tile may still be INSIDE "tile_net_poll()",
* and in fact, many will be, if there is heavy network load.
*
* Calling "on_each_cpu(tile_net_stop_disable, (void *)dev, 1)" when
* any tile is still "napi_schedule()"'d will induce a horrible crash
* when "msleep()" is called. This includes tiles which are inside
* "tile_net_poll()" which have not yet called "napi_complete()".
*
* So, we must first try to wait long enough for other tiles to finish
* with any current "tile_net_poll()" call, and, hopefully, to clear
* the "scheduled" flag. ISSUE: It is unclear what happens to tiles
* which have called "napi_schedule()" but which had not yet tried to
* call "tile_net_poll()", or which exhausted their budget inside
* "tile_net_poll()" just before this function was called.
*/
static int tile_net_stop(struct net_device *dev)
{
struct tile_net_priv *priv = netdev_priv(dev);
PDEBUG("tile_net_stop()\n");
/* Start discarding packets. */
priv->active = false;
/* Make sure "active" is visible to all tiles. */
mb();
/*
* On each tile, make sure no NEW packets get delivered, and
* disable the ingress interrupt.
*
* Note that the ingress interrupt can fire AFTER this,
* presumably due to packets which were recently delivered,
* but it will have no effect.
*/
on_each_cpu(tile_net_deregister, (void *)dev, 1);
/* Optimistically drain LIPP buffers. */
(void)tile_net_drain_lipp_buffers(priv);
/* ISSUE: Only needed if not yet fully open. */
cancel_delayed_work_sync(&priv->retry_work);
/* Can't transmit any more. */
netif_stop_queue(dev);
/* Disable NAPI on each tile. */
on_each_cpu(tile_net_stop_disable, (void *)dev, 1);
/*
* Drain any remaining LIPP buffers. NOTE: This "printk()"
* has never been observed, but in theory it could happen.
*/
if (tile_net_drain_lipp_buffers(priv) != 0)
printk("Had to drain some extra LIPP buffers!\n");
/* Stop LIPP/LEPP. */
tile_net_stop_aux(dev);
/*
* ISSUE: It appears that, in practice anyway, by the time we
* get here, there are no pending completions, but just in case,
* we free (all of) them anyway.
*/
while (tile_net_lepp_free_comps(dev, true))
/* loop */;
/* Wipe the EPP queue, and wait till the stores hit the EPP. */
memset(priv->eq, 0, sizeof(lepp_queue_t));
mb();
return 0;
}
/*
* Prepare the "frags" info for the resulting LEPP command.
*
* If needed, flush the memory used by the frags.
*/
static unsigned int tile_net_tx_frags(lepp_frag_t *frags,
struct sk_buff *skb,
void *b_data, unsigned int b_len)
{
unsigned int i, n = 0;
struct skb_shared_info *sh = skb_shinfo(skb);
phys_addr_t cpa;
if (b_len != 0) {
if (!hash_default)
finv_buffer_remote(b_data, b_len, 0);
cpa = __pa(b_data);
frags[n].cpa_lo = cpa;
frags[n].cpa_hi = cpa >> 32;
frags[n].length = b_len;
frags[n].hash_for_home = hash_default;
n++;
}
for (i = 0; i < sh->nr_frags; i++) {
skb_frag_t *f = &sh->frags[i];
unsigned long pfn = page_to_pfn(skb_frag_page(f));
/* FIXME: Compute "hash_for_home" properly. */
/* ISSUE: The hypervisor checks CHIP_HAS_REV1_DMA_PACKETS(). */
int hash_for_home = hash_default;
/* FIXME: Hmmm. */
if (!hash_default) {
void *va = pfn_to_kaddr(pfn) + f->page_offset;
BUG_ON(PageHighMem(skb_frag_page(f)));
finv_buffer_remote(va, skb_frag_size(f), 0);
}
cpa = ((phys_addr_t)pfn << PAGE_SHIFT) + f->page_offset;
frags[n].cpa_lo = cpa;
frags[n].cpa_hi = cpa >> 32;
frags[n].length = skb_frag_size(f);
frags[n].hash_for_home = hash_for_home;
n++;
}
return n;
}
/*
* This function takes "skb", consisting of a header template and a
* payload, and hands it to LEPP, to emit as one or more segments,
* each consisting of a possibly modified header, plus a piece of the
* payload, via a process known as "tcp segmentation offload".
*
* Usually, "data" will contain the header template, of size "sh_len",
* and "sh->frags" will contain "skb->data_len" bytes of payload, and
* there will be "sh->gso_segs" segments.
*
* Sometimes, if "sendfile()" requires copying, we will be called with
* "data" containing the header and payload, with "frags" being empty.
*
* Sometimes, for example when using NFS over TCP, a single segment can
* span 3 fragments, which must be handled carefully in LEPP.
*
* See "emulate_large_send_offload()" for some reference code, which
* does not handle checksumming.
*
* ISSUE: How do we make sure that high memory DMA does not migrate?
*/
static int tile_net_tx_tso(struct sk_buff *skb, struct net_device *dev)
{
struct tile_net_priv *priv = netdev_priv(dev);
int my_cpu = smp_processor_id();
struct tile_net_cpu *info = priv->cpu[my_cpu];
struct tile_net_stats_t *stats = &info->stats;
struct skb_shared_info *sh = skb_shinfo(skb);
unsigned char *data = skb->data;
/* The ip header follows the ethernet header. */
struct iphdr *ih = ip_hdr(skb);
unsigned int ih_len = ih->ihl * 4;
/* Note that "nh == ih", by definition. */
unsigned char *nh = skb_network_header(skb);
unsigned int eh_len = nh - data;
/* The tcp header follows the ip header. */
struct tcphdr *th = (struct tcphdr *)(nh + ih_len);
unsigned int th_len = th->doff * 4;
/* The total number of header bytes. */
/* NOTE: This may be less than skb_headlen(skb). */
unsigned int sh_len = eh_len + ih_len + th_len;
/* The number of payload bytes at "skb->data + sh_len". */
/* This is non-zero for sendfile() without HIGHDMA. */
unsigned int b_len = skb_headlen(skb) - sh_len;
/* The total number of payload bytes. */
unsigned int d_len = b_len + skb->data_len;
/* The maximum payload size. */
unsigned int p_len = sh->gso_size;
/* The total number of segments. */
unsigned int num_segs = sh->gso_segs;
/* The temporary copy of the command. */
u32 cmd_body[(LEPP_MAX_CMD_SIZE + 3) / 4];
lepp_tso_cmd_t *cmd = (lepp_tso_cmd_t *)cmd_body;
/* Analyze the "frags". */
unsigned int num_frags =
tile_net_tx_frags(cmd->frags, skb, data + sh_len, b_len);
/* The size of the command, including frags and header. */
size_t cmd_size = LEPP_TSO_CMD_SIZE(num_frags, sh_len);
/* The command header. */
lepp_tso_cmd_t cmd_init = {
.tso = true,
.header_size = sh_len,
.ip_offset = eh_len,
.tcp_offset = eh_len + ih_len,
.payload_size = p_len,
.num_frags = num_frags,
};
unsigned long irqflags;
lepp_queue_t *eq = priv->eq;
struct sk_buff *olds[8];
unsigned int wanted = 8;
unsigned int i, nolds = 0;
unsigned int cmd_head, cmd_tail, cmd_next;
unsigned int comp_tail;
/* Paranoia. */
BUG_ON(skb->protocol != htons(ETH_P_IP));
BUG_ON(ih->protocol != IPPROTO_TCP);
BUG_ON(skb->ip_summed != CHECKSUM_PARTIAL);
BUG_ON(num_frags > LEPP_MAX_FRAGS);
/*--BUG_ON(num_segs != (d_len + (p_len - 1)) / p_len); */
BUG_ON(num_segs <= 1);
/* Finish preparing the command. */
/* Copy the command header. */
*cmd = cmd_init;
/* Copy the "header". */
memcpy(&cmd->frags[num_frags], data, sh_len);
/* Prefetch and wait, to minimize time spent holding the spinlock. */
prefetch_L1(&eq->comp_tail);
prefetch_L1(&eq->cmd_tail);
mb();
/* Enqueue the command. */
spin_lock_irqsave(&priv->eq_lock, irqflags);
/* Handle completions if needed to make room. */
/* NOTE: Return NETDEV_TX_BUSY if there is still no room. */
if (lepp_num_free_comp_slots(eq) == 0) {
nolds = tile_net_lepp_grab_comps(eq, olds, wanted, 0);
if (nolds == 0) {
busy:
spin_unlock_irqrestore(&priv->eq_lock, irqflags);
return NETDEV_TX_BUSY;
}
}
cmd_head = eq->cmd_head;
cmd_tail = eq->cmd_tail;
/* Prepare to advance, detecting full queue. */
/* NOTE: Return NETDEV_TX_BUSY if the queue is full. */
cmd_next = cmd_tail + cmd_size;
if (cmd_tail < cmd_head && cmd_next >= cmd_head)
goto busy;
if (cmd_next > LEPP_CMD_LIMIT) {
cmd_next = 0;
if (cmd_next == cmd_head)
goto busy;
}
/* Copy the command. */
memcpy(&eq->cmds[cmd_tail], cmd, cmd_size);
/* Advance. */
cmd_tail = cmd_next;
/* Record "skb" for eventual freeing. */
comp_tail = eq->comp_tail;
eq->comps[comp_tail] = skb;
LEPP_QINC(comp_tail);
eq->comp_tail = comp_tail;
/* Flush before allowing LEPP to handle the command. */
/* ISSUE: Is this the optimal location for the flush? */
__insn_mf();
eq->cmd_tail = cmd_tail;
/* NOTE: Using "4" here is more efficient than "0" or "2", */
/* and, strangely, more efficient than pre-checking the number */
/* of available completions, and comparing it to 4. */
if (nolds == 0)
nolds = tile_net_lepp_grab_comps(eq, olds, wanted, 4);
spin_unlock_irqrestore(&priv->eq_lock, irqflags);
/* Handle completions. */
for (i = 0; i < nolds; i++)
dev_consume_skb_any(olds[i]);
/* Update stats. */
u64_stats_update_begin(&stats->syncp);
stats->tx_packets += num_segs;
stats->tx_bytes += (num_segs * sh_len) + d_len;
u64_stats_update_end(&stats->syncp);
/* Make sure the egress timer is scheduled. */
tile_net_schedule_egress_timer(info);
return NETDEV_TX_OK;
}
/*
* Transmit a packet (called by the kernel via "hard_start_xmit" hook).
*/
static int tile_net_tx(struct sk_buff *skb, struct net_device *dev)
{
struct tile_net_priv *priv = netdev_priv(dev);
int my_cpu = smp_processor_id();
struct tile_net_cpu *info = priv->cpu[my_cpu];
struct tile_net_stats_t *stats = &info->stats;
unsigned long irqflags;
struct skb_shared_info *sh = skb_shinfo(skb);
unsigned int len = skb->len;
unsigned char *data = skb->data;
unsigned int csum_start = skb_checksum_start_offset(skb);
lepp_frag_t frags[1 + MAX_SKB_FRAGS];
unsigned int num_frags;
lepp_queue_t *eq = priv->eq;
struct sk_buff *olds[8];
unsigned int wanted = 8;
unsigned int i, nolds = 0;
unsigned int cmd_size = sizeof(lepp_cmd_t);
unsigned int cmd_head, cmd_tail, cmd_next;
unsigned int comp_tail;
lepp_cmd_t cmds[1 + MAX_SKB_FRAGS];
/*
* This is paranoia, since we think that if the link doesn't come
* up, telling Linux we have no carrier will keep it from trying
* to transmit. If it does, though, we can't execute this routine,
* since data structures we depend on aren't set up yet.
*/
if (!info->registered)
return NETDEV_TX_BUSY;
/* Save the timestamp. */
netif_trans_update(dev);
#ifdef TILE_NET_PARANOIA
#if CHIP_HAS_CBOX_HOME_MAP()
if (hash_default) {
HV_PTE pte = *virt_to_pte(current->mm, (unsigned long)data);
if (hv_pte_get_mode(pte) != HV_PTE_MODE_CACHE_HASH_L3)
panic("Non-HFH egress buffer! VA=%p Mode=%d PTE=%llx",
data, hv_pte_get_mode(pte), hv_pte_val(pte));
}
#endif
#endif
#ifdef TILE_NET_DUMP_PACKETS
/* ISSUE: Does not dump the "frags". */
dump_packet(data, skb_headlen(skb), "tx");
#endif /* TILE_NET_DUMP_PACKETS */
if (sh->gso_size != 0)
return tile_net_tx_tso(skb, dev);
/* Prepare the commands. */
num_frags = tile_net_tx_frags(frags, skb, data, skb_headlen(skb));
for (i = 0; i < num_frags; i++) {
bool final = (i == num_frags - 1);
lepp_cmd_t cmd = {
.cpa_lo = frags[i].cpa_lo,
.cpa_hi = frags[i].cpa_hi,
.length = frags[i].length,
.hash_for_home = frags[i].hash_for_home,
.send_completion = final,
.end_of_packet = final
};
if (i == 0 && skb->ip_summed == CHECKSUM_PARTIAL) {
cmd.compute_checksum = 1;
cmd.checksum_data.bits.start_byte = csum_start;
cmd.checksum_data.bits.count = len - csum_start;
cmd.checksum_data.bits.destination_byte =
csum_start + skb->csum_offset;
}
cmds[i] = cmd;
}
/* Prefetch and wait, to minimize time spent holding the spinlock. */
prefetch_L1(&eq->comp_tail);
prefetch_L1(&eq->cmd_tail);
mb();
/* Enqueue the commands. */
spin_lock_irqsave(&priv->eq_lock, irqflags);
/* Handle completions if needed to make room. */
/* NOTE: Return NETDEV_TX_BUSY if there is still no room. */
if (lepp_num_free_comp_slots(eq) == 0) {
nolds = tile_net_lepp_grab_comps(eq, olds, wanted, 0);
if (nolds == 0) {
busy:
spin_unlock_irqrestore(&priv->eq_lock, irqflags);
return NETDEV_TX_BUSY;
}
}
cmd_head = eq->cmd_head;
cmd_tail = eq->cmd_tail;
/* Copy the commands, or fail. */
/* NOTE: Return NETDEV_TX_BUSY if the queue is full. */
for (i = 0; i < num_frags; i++) {
/* Prepare to advance, detecting full queue. */
cmd_next = cmd_tail + cmd_size;
if (cmd_tail < cmd_head && cmd_next >= cmd_head)
goto busy;
if (cmd_next > LEPP_CMD_LIMIT) {
cmd_next = 0;
if (cmd_next == cmd_head)
goto busy;
}
/* Copy the command. */
*(lepp_cmd_t *)&eq->cmds[cmd_tail] = cmds[i];
/* Advance. */
cmd_tail = cmd_next;
}
/* Record "skb" for eventual freeing. */
comp_tail = eq->comp_tail;
eq->comps[comp_tail] = skb;
LEPP_QINC(comp_tail);
eq->comp_tail = comp_tail;
/* Flush before allowing LEPP to handle the command. */
/* ISSUE: Is this the optimal location for the flush? */
__insn_mf();
eq->cmd_tail = cmd_tail;
/* NOTE: Using "4" here is more efficient than "0" or "2", */
/* and, strangely, more efficient than pre-checking the number */
/* of available completions, and comparing it to 4. */
if (nolds == 0)
nolds = tile_net_lepp_grab_comps(eq, olds, wanted, 4);
spin_unlock_irqrestore(&priv->eq_lock, irqflags);
/* Handle completions. */
for (i = 0; i < nolds; i++)
dev_consume_skb_any(olds[i]);
/* HACK: Track "expanded" size for short packets (e.g. 42 < 60). */
u64_stats_update_begin(&stats->syncp);
stats->tx_packets++;
stats->tx_bytes += ((len >= ETH_ZLEN) ? len : ETH_ZLEN);
u64_stats_update_end(&stats->syncp);
/* Make sure the egress timer is scheduled. */
tile_net_schedule_egress_timer(info);
return NETDEV_TX_OK;
}
/*
* Deal with a transmit timeout.
*/
static void tile_net_tx_timeout(struct net_device *dev)
{
PDEBUG("tile_net_tx_timeout()\n");
PDEBUG("Transmit timeout at %ld, latency %ld\n", jiffies,
jiffies - dev_trans_start(dev));
/* XXX: ISSUE: This doesn't seem useful for us. */
netif_wake_queue(dev);
}
/*
* Ioctl commands.
*/
static int tile_net_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
{
return -EOPNOTSUPP;
}
/*
* Get System Network Statistics.
*
* Returns the address of the device statistics structure.
*/
static void tile_net_get_stats64(struct net_device *dev,
struct rtnl_link_stats64 *stats)
{
struct tile_net_priv *priv = netdev_priv(dev);
u64 rx_packets = 0, tx_packets = 0;
u64 rx_bytes = 0, tx_bytes = 0;
u64 rx_errors = 0, rx_dropped = 0;
int i;
for_each_online_cpu(i) {
struct tile_net_stats_t *cpu_stats;
u64 trx_packets, ttx_packets, trx_bytes, ttx_bytes;
u64 trx_errors, trx_dropped;
unsigned int start;
if (priv->cpu[i] == NULL)
continue;
cpu_stats = &priv->cpu[i]->stats;
do {
start = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
trx_packets = cpu_stats->rx_packets;
ttx_packets = cpu_stats->tx_packets;
trx_bytes = cpu_stats->rx_bytes;
ttx_bytes = cpu_stats->tx_bytes;
trx_errors = cpu_stats->rx_errors;
trx_dropped = cpu_stats->rx_dropped;
} while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start));
rx_packets += trx_packets;
tx_packets += ttx_packets;
rx_bytes += trx_bytes;
tx_bytes += ttx_bytes;
rx_errors += trx_errors;
rx_dropped += trx_dropped;
}
stats->rx_packets = rx_packets;
stats->tx_packets = tx_packets;
stats->rx_bytes = rx_bytes;
stats->tx_bytes = tx_bytes;
stats->rx_errors = rx_errors;
stats->rx_dropped = rx_dropped;
}
/*
* Change the Ethernet Address of the NIC.
*
* The hypervisor driver does not support changing MAC address. However,
* the IPP does not do anything with the MAC address, so the address which
* gets used on outgoing packets, and which is accepted on incoming packets,
* is completely up to the NetIO program or kernel driver which is actually
* handling them.
*
* Returns 0 on success, negative on failure.
*/
static int tile_net_set_mac_address(struct net_device *dev, void *p)
{
struct sockaddr *addr = p;
if (!is_valid_ether_addr(addr->sa_data))
return -EADDRNOTAVAIL;
/* ISSUE: Note that "dev_addr" is now a pointer. */
memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
return 0;
}
/*
* Obtain the MAC address from the hypervisor.
* This must be done before opening the device.
*/
static int tile_net_get_mac(struct net_device *dev)
{
struct tile_net_priv *priv = netdev_priv(dev);
char hv_dev_name[32];
int len;
__netio_getset_offset_t offset = { .word = NETIO_IPP_PARAM_OFF };
int ret;
/* For example, "xgbe0". */
strcpy(hv_dev_name, dev->name);
len = strlen(hv_dev_name);
/* For example, "xgbe/0". */
hv_dev_name[len] = hv_dev_name[len - 1];
hv_dev_name[len - 1] = '/';
len++;
/* For example, "xgbe/0/native_hash". */
strcpy(hv_dev_name + len, hash_default ? "/native_hash" : "/native");
/* Get the hypervisor handle for this device. */
priv->hv_devhdl = hv_dev_open((HV_VirtAddr)hv_dev_name, 0);
PDEBUG("hv_dev_open(%s) returned %d %p\n",
hv_dev_name, priv->hv_devhdl, &priv->hv_devhdl);
if (priv->hv_devhdl < 0) {
if (priv->hv_devhdl == HV_ENODEV)
printk(KERN_DEBUG "Ignoring unconfigured device %s\n",
hv_dev_name);
else
printk(KERN_DEBUG "hv_dev_open(%s) returned %d\n",
hv_dev_name, priv->hv_devhdl);
return -1;
}
/*
* Read the hardware address from the hypervisor.
* ISSUE: Note that "dev_addr" is now a pointer.
*/
offset.bits.class = NETIO_PARAM;
offset.bits.addr = NETIO_PARAM_MAC;
ret = hv_dev_pread(priv->hv_devhdl, 0,
(HV_VirtAddr)dev->dev_addr, dev->addr_len,
offset.word);
PDEBUG("hv_dev_pread(NETIO_PARAM_MAC) returned %d\n", ret);
if (ret <= 0) {
printk(KERN_DEBUG "hv_dev_pread(NETIO_PARAM_MAC) %s failed\n",
dev->name);
/*
* Since the device is configured by the hypervisor but we
* can't get its MAC address, we are most likely running
* the simulator, so let's generate a random MAC address.
*/
eth_hw_addr_random(dev);
}
return 0;
}
#ifdef CONFIG_NET_POLL_CONTROLLER
/*
* Polling 'interrupt' - used by things like netconsole to send skbs
* without having to re-enable interrupts. It's not called while
* the interrupt routine is executing.
*/
static void tile_net_netpoll(struct net_device *dev)
{
struct tile_net_priv *priv = netdev_priv(dev);
disable_percpu_irq(priv->intr_id);
tile_net_handle_ingress_interrupt(priv->intr_id, dev);
enable_percpu_irq(priv->intr_id, 0);
}
#endif
static const struct net_device_ops tile_net_ops = {
.ndo_open = tile_net_open,
.ndo_stop = tile_net_stop,
.ndo_start_xmit = tile_net_tx,
.ndo_do_ioctl = tile_net_ioctl,
.ndo_get_stats64 = tile_net_get_stats64,
.ndo_tx_timeout = tile_net_tx_timeout,
.ndo_set_mac_address = tile_net_set_mac_address,
#ifdef CONFIG_NET_POLL_CONTROLLER
.ndo_poll_controller = tile_net_netpoll,
#endif
};
/*
* The setup function.
*
* This uses ether_setup() to assign various fields in dev, including
* setting IFF_BROADCAST and IFF_MULTICAST, then sets some extra fields.
*/
static void tile_net_setup(struct net_device *dev)
{
netdev_features_t features = 0;
ether_setup(dev);
dev->netdev_ops = &tile_net_ops;
dev->watchdog_timeo = TILE_NET_TIMEOUT;
dev->tx_queue_len = TILE_NET_TX_QUEUE_LEN;
/* MTU range: 68 - 1500 */
dev->mtu = TILE_NET_MTU;
dev->min_mtu = ETH_MIN_MTU;
dev->max_mtu = TILE_NET_MTU;
features |= NETIF_F_HW_CSUM;
features |= NETIF_F_SG;
/* We support TSO iff the HV supports sufficient frags. */
if (LEPP_MAX_FRAGS >= 1 + MAX_SKB_FRAGS)
features |= NETIF_F_TSO;
/* We can't support HIGHDMA without hash_default, since we need
* to be able to finv() with a VA if we don't have hash_default.
*/
if (hash_default)
features |= NETIF_F_HIGHDMA;
dev->hw_features |= features;
dev->vlan_features |= features;
dev->features |= features;
}
/*
* Allocate the device structure, register the device, and obtain the
* MAC address from the hypervisor.
*/
static struct net_device *tile_net_dev_init(const char *name)
{
int ret;
struct net_device *dev;
struct tile_net_priv *priv;
/*
* Allocate the device structure. This allocates "priv", calls
* tile_net_setup(), and saves "name". Normally, "name" is a
* template, instantiated by register_netdev(), but not for us.
*/
dev = alloc_netdev(sizeof(*priv), name, NET_NAME_UNKNOWN,
tile_net_setup);
if (!dev) {
pr_err("alloc_netdev(%s) failed\n", name);
return NULL;
}
priv = netdev_priv(dev);
/* Initialize "priv". */
memset(priv, 0, sizeof(*priv));
/* Save "dev" for "tile_net_open_retry()". */
priv->dev = dev;
INIT_DELAYED_WORK(&priv->retry_work, tile_net_open_retry);
spin_lock_init(&priv->eq_lock);
/* Allocate "eq". */
priv->eq_pages = alloc_pages(GFP_KERNEL | __GFP_ZERO, EQ_ORDER);
if (!priv->eq_pages) {
free_netdev(dev);
return NULL;
}
priv->eq = page_address(priv->eq_pages);
/* Register the network device. */
ret = register_netdev(dev);
if (ret) {
pr_err("register_netdev %s failed %d\n", dev->name, ret);
__free_pages(priv->eq_pages, EQ_ORDER);
free_netdev(dev);
return NULL;
}
/* Get the MAC address. */
ret = tile_net_get_mac(dev);
if (ret < 0) {
unregister_netdev(dev);
__free_pages(priv->eq_pages, EQ_ORDER);
free_netdev(dev);
return NULL;
}
return dev;
}
/*
* Module cleanup.
*
* FIXME: If compiled as a module, this module cannot be "unloaded",
* because the "ingress interrupt handler" is registered permanently.
*/
static void tile_net_cleanup(void)
{
int i;
for (i = 0; i < TILE_NET_DEVS; i++) {
if (tile_net_devs[i]) {
struct net_device *dev = tile_net_devs[i];
struct tile_net_priv *priv = netdev_priv(dev);
unregister_netdev(dev);
finv_buffer_remote(priv->eq, EQ_SIZE, 0);
__free_pages(priv->eq_pages, EQ_ORDER);
free_netdev(dev);
}
}
}
/*
* Module initialization.
*/
static int tile_net_init_module(void)
{
pr_info("Tilera Network Driver\n");
tile_net_devs[0] = tile_net_dev_init("xgbe0");
tile_net_devs[1] = tile_net_dev_init("xgbe1");
tile_net_devs[2] = tile_net_dev_init("gbe0");
tile_net_devs[3] = tile_net_dev_init("gbe1");
return 0;
}
module_init(tile_net_init_module);
module_exit(tile_net_cleanup);
#ifndef MODULE
/*
* The "network_cpus" boot argument specifies the cpus that are dedicated
* to handle ingress packets.
*
* The parameter should be in the form "network_cpus=m-n[,x-y]", where
* m, n, x, y are integer numbers that represent the cpus that can be
* neither a dedicated cpu nor a dataplane cpu.
*/
static int __init network_cpus_setup(char *str)
{
int rc = cpulist_parse_crop(str, &network_cpus_map);
if (rc != 0) {
pr_warn("network_cpus=%s: malformed cpu list\n", str);
} else {
/* Remove dedicated cpus. */
cpumask_and(&network_cpus_map, &network_cpus_map,
cpu_possible_mask);
if (cpumask_empty(&network_cpus_map)) {
pr_warn("Ignoring network_cpus='%s'\n", str);
} else {
pr_info("Linux network CPUs: %*pbl\n",
cpumask_pr_args(&network_cpus_map));
network_cpus_used = true;
}
}
return 0;
}
__setup("network_cpus=", network_cpus_setup);
#endif
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