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linux/drivers/net/sfc/efx.c
Ben Hutchings d4fabcc8e8 sfc: Do not use efx_process_channel_now() in online self-test 
During self-tests we use efx_process_channel_now() to handle
completion and other events synchronously.  This disables interrupts
and NAPI processing for the channel in question, but it may still be
interrupted by another channel.  A single socket may receive packets
from multiple net devices or even multiple channels of the same net
device, so this can result in deadlock on a socket lock.

Receiving packets in process context will also result in incorrect
classification by the network cgroup classifier.

Therefore, we must only use efx_process_channel_now() in the offline
loopback tests (which never deliver packets up the stack) and not for
the online interrupt and event tests.

For the interrupt test, there is no reason to process events.  We
only care that an interrupt is raised.

For the event test, we want to know whether events have been received,
and there may be many events ahead of the one we inject.  Therefore
remove efx_channel::magic_count and instead test whether
efx_channel::eventq_read_ptr advances.  This is currently an event
queue index and might wrap around to exactly the same value, resulting
in a false negative.  Therefore move the masking to efx_event() and
efx_nic_eventq_read_ack() so that it cannot wrap within the time of
the test.

The event test also tries to diagnose failures by checking whether an
event was delivered without causing an interrupt.  Add and use a
helper function that only does this.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
2011-04-12 16:37:54 +01:00

2705 lines
70 KiB
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/****************************************************************************
* Driver for Solarflare Solarstorm network controllers and boards
* Copyright 2005-2006 Fen Systems Ltd.
* Copyright 2005-2011 Solarflare Communications Inc.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation, incorporated herein by reference.
*/
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/delay.h>
#include <linux/notifier.h>
#include <linux/ip.h>
#include <linux/tcp.h>
#include <linux/in.h>
#include <linux/crc32.h>
#include <linux/ethtool.h>
#include <linux/topology.h>
#include <linux/gfp.h>
#include <linux/cpu_rmap.h>
#include "net_driver.h"
#include "efx.h"
#include "nic.h"
#include "mcdi.h"
#include "workarounds.h"
/**************************************************************************
*
* Type name strings
*
**************************************************************************
*/
/* Loopback mode names (see LOOPBACK_MODE()) */
const unsigned int efx_loopback_mode_max = LOOPBACK_MAX;
const char *efx_loopback_mode_names[] = {
[LOOPBACK_NONE] = "NONE",
[LOOPBACK_DATA] = "DATAPATH",
[LOOPBACK_GMAC] = "GMAC",
[LOOPBACK_XGMII] = "XGMII",
[LOOPBACK_XGXS] = "XGXS",
[LOOPBACK_XAUI] = "XAUI",
[LOOPBACK_GMII] = "GMII",
[LOOPBACK_SGMII] = "SGMII",
[LOOPBACK_XGBR] = "XGBR",
[LOOPBACK_XFI] = "XFI",
[LOOPBACK_XAUI_FAR] = "XAUI_FAR",
[LOOPBACK_GMII_FAR] = "GMII_FAR",
[LOOPBACK_SGMII_FAR] = "SGMII_FAR",
[LOOPBACK_XFI_FAR] = "XFI_FAR",
[LOOPBACK_GPHY] = "GPHY",
[LOOPBACK_PHYXS] = "PHYXS",
[LOOPBACK_PCS] = "PCS",
[LOOPBACK_PMAPMD] = "PMA/PMD",
[LOOPBACK_XPORT] = "XPORT",
[LOOPBACK_XGMII_WS] = "XGMII_WS",
[LOOPBACK_XAUI_WS] = "XAUI_WS",
[LOOPBACK_XAUI_WS_FAR] = "XAUI_WS_FAR",
[LOOPBACK_XAUI_WS_NEAR] = "XAUI_WS_NEAR",
[LOOPBACK_GMII_WS] = "GMII_WS",
[LOOPBACK_XFI_WS] = "XFI_WS",
[LOOPBACK_XFI_WS_FAR] = "XFI_WS_FAR",
[LOOPBACK_PHYXS_WS] = "PHYXS_WS",
};
const unsigned int efx_reset_type_max = RESET_TYPE_MAX;
const char *efx_reset_type_names[] = {
[RESET_TYPE_INVISIBLE] = "INVISIBLE",
[RESET_TYPE_ALL] = "ALL",
[RESET_TYPE_WORLD] = "WORLD",
[RESET_TYPE_DISABLE] = "DISABLE",
[RESET_TYPE_TX_WATCHDOG] = "TX_WATCHDOG",
[RESET_TYPE_INT_ERROR] = "INT_ERROR",
[RESET_TYPE_RX_RECOVERY] = "RX_RECOVERY",
[RESET_TYPE_RX_DESC_FETCH] = "RX_DESC_FETCH",
[RESET_TYPE_TX_DESC_FETCH] = "TX_DESC_FETCH",
[RESET_TYPE_TX_SKIP] = "TX_SKIP",
[RESET_TYPE_MC_FAILURE] = "MC_FAILURE",
};
#define EFX_MAX_MTU (9 * 1024)
/* Reset workqueue. If any NIC has a hardware failure then a reset will be
* queued onto this work queue. This is not a per-nic work queue, because
* efx_reset_work() acquires the rtnl lock, so resets are naturally serialised.
*/
static struct workqueue_struct *reset_workqueue;
/**************************************************************************
*
* Configurable values
*
*************************************************************************/
/*
* Use separate channels for TX and RX events
*
* Set this to 1 to use separate channels for TX and RX. It allows us
* to control interrupt affinity separately for TX and RX.
*
* This is only used in MSI-X interrupt mode
*/
static unsigned int separate_tx_channels;
module_param(separate_tx_channels, uint, 0444);
MODULE_PARM_DESC(separate_tx_channels,
"Use separate channels for TX and RX");
/* This is the weight assigned to each of the (per-channel) virtual
* NAPI devices.
*/
static int napi_weight = 64;
/* This is the time (in jiffies) between invocations of the hardware
* monitor. On Falcon-based NICs, this will:
* - Check the on-board hardware monitor;
* - Poll the link state and reconfigure the hardware as necessary.
*/
static unsigned int efx_monitor_interval = 1 * HZ;
/* This controls whether or not the driver will initialise devices
* with invalid MAC addresses stored in the EEPROM or flash. If true,
* such devices will be initialised with a random locally-generated
* MAC address. This allows for loading the sfc_mtd driver to
* reprogram the flash, even if the flash contents (including the MAC
* address) have previously been erased.
*/
static unsigned int allow_bad_hwaddr;
/* Initial interrupt moderation settings. They can be modified after
* module load with ethtool.
*
* The default for RX should strike a balance between increasing the
* round-trip latency and reducing overhead.
*/
static unsigned int rx_irq_mod_usec = 60;
/* Initial interrupt moderation settings. They can be modified after
* module load with ethtool.
*
* This default is chosen to ensure that a 10G link does not go idle
* while a TX queue is stopped after it has become full. A queue is
* restarted when it drops below half full. The time this takes (assuming
* worst case 3 descriptors per packet and 1024 descriptors) is
* 512 / 3 * 1.2 = 205 usec.
*/
static unsigned int tx_irq_mod_usec = 150;
/* This is the first interrupt mode to try out of:
* 0 => MSI-X
* 1 => MSI
* 2 => legacy
*/
static unsigned int interrupt_mode;
/* This is the requested number of CPUs to use for Receive-Side Scaling (RSS),
* i.e. the number of CPUs among which we may distribute simultaneous
* interrupt handling.
*
* Cards without MSI-X will only target one CPU via legacy or MSI interrupt.
* The default (0) means to assign an interrupt to each package (level II cache)
*/
static unsigned int rss_cpus;
module_param(rss_cpus, uint, 0444);
MODULE_PARM_DESC(rss_cpus, "Number of CPUs to use for Receive-Side Scaling");
static int phy_flash_cfg;
module_param(phy_flash_cfg, int, 0644);
MODULE_PARM_DESC(phy_flash_cfg, "Set PHYs into reflash mode initially");
static unsigned irq_adapt_low_thresh = 10000;
module_param(irq_adapt_low_thresh, uint, 0644);
MODULE_PARM_DESC(irq_adapt_low_thresh,
"Threshold score for reducing IRQ moderation");
static unsigned irq_adapt_high_thresh = 20000;
module_param(irq_adapt_high_thresh, uint, 0644);
MODULE_PARM_DESC(irq_adapt_high_thresh,
"Threshold score for increasing IRQ moderation");
static unsigned debug = (NETIF_MSG_DRV | NETIF_MSG_PROBE |
NETIF_MSG_LINK | NETIF_MSG_IFDOWN |
NETIF_MSG_IFUP | NETIF_MSG_RX_ERR |
NETIF_MSG_TX_ERR | NETIF_MSG_HW);
module_param(debug, uint, 0);
MODULE_PARM_DESC(debug, "Bitmapped debugging message enable value");
/**************************************************************************
*
* Utility functions and prototypes
*
*************************************************************************/
static void efx_remove_channels(struct efx_nic *efx);
static void efx_remove_port(struct efx_nic *efx);
static void efx_init_napi(struct efx_nic *efx);
static void efx_fini_napi(struct efx_nic *efx);
static void efx_fini_napi_channel(struct efx_channel *channel);
static void efx_fini_struct(struct efx_nic *efx);
static void efx_start_all(struct efx_nic *efx);
static void efx_stop_all(struct efx_nic *efx);
#define EFX_ASSERT_RESET_SERIALISED(efx) \
do { \
if ((efx->state == STATE_RUNNING) || \
(efx->state == STATE_DISABLED)) \
ASSERT_RTNL(); \
} while (0)
/**************************************************************************
*
* Event queue processing
*
*************************************************************************/
/* Process channel's event queue
*
* This function is responsible for processing the event queue of a
* single channel. The caller must guarantee that this function will
* never be concurrently called more than once on the same channel,
* though different channels may be being processed concurrently.
*/
static int efx_process_channel(struct efx_channel *channel, int budget)
{
struct efx_nic *efx = channel->efx;
int spent;
if (unlikely(efx->reset_pending != RESET_TYPE_NONE ||
!channel->enabled))
return 0;
spent = efx_nic_process_eventq(channel, budget);
if (spent == 0)
return 0;
/* Deliver last RX packet. */
if (channel->rx_pkt) {
__efx_rx_packet(channel, channel->rx_pkt,
channel->rx_pkt_csummed);
channel->rx_pkt = NULL;
}
efx_rx_strategy(channel);
efx_fast_push_rx_descriptors(efx_channel_get_rx_queue(channel));
return spent;
}
/* Mark channel as finished processing
*
* Note that since we will not receive further interrupts for this
* channel before we finish processing and call the eventq_read_ack()
* method, there is no need to use the interrupt hold-off timers.
*/
static inline void efx_channel_processed(struct efx_channel *channel)
{
/* The interrupt handler for this channel may set work_pending
* as soon as we acknowledge the events we've seen. Make sure
* it's cleared before then. */
channel->work_pending = false;
smp_wmb();
efx_nic_eventq_read_ack(channel);
}
/* NAPI poll handler
*
* NAPI guarantees serialisation of polls of the same device, which
* provides the guarantee required by efx_process_channel().
*/
static int efx_poll(struct napi_struct *napi, int budget)
{
struct efx_channel *channel =
container_of(napi, struct efx_channel, napi_str);
struct efx_nic *efx = channel->efx;
int spent;
netif_vdbg(efx, intr, efx->net_dev,
"channel %d NAPI poll executing on CPU %d\n",
channel->channel, raw_smp_processor_id());
spent = efx_process_channel(channel, budget);
if (spent < budget) {
if (channel->channel < efx->n_rx_channels &&
efx->irq_rx_adaptive &&
unlikely(++channel->irq_count == 1000)) {
if (unlikely(channel->irq_mod_score <
irq_adapt_low_thresh)) {
if (channel->irq_moderation > 1) {
channel->irq_moderation -= 1;
efx->type->push_irq_moderation(channel);
}
} else if (unlikely(channel->irq_mod_score >
irq_adapt_high_thresh)) {
if (channel->irq_moderation <
efx->irq_rx_moderation) {
channel->irq_moderation += 1;
efx->type->push_irq_moderation(channel);
}
}
channel->irq_count = 0;
channel->irq_mod_score = 0;
}
efx_filter_rfs_expire(channel);
/* There is no race here; although napi_disable() will
* only wait for napi_complete(), this isn't a problem
* since efx_channel_processed() will have no effect if
* interrupts have already been disabled.
*/
napi_complete(napi);
efx_channel_processed(channel);
}
return spent;
}
/* Process the eventq of the specified channel immediately on this CPU
*
* Disable hardware generated interrupts, wait for any existing
* processing to finish, then directly poll (and ack ) the eventq.
* Finally reenable NAPI and interrupts.
*
* This is for use only during a loopback self-test. It must not
* deliver any packets up the stack as this can result in deadlock.
*/
void efx_process_channel_now(struct efx_channel *channel)
{
struct efx_nic *efx = channel->efx;
BUG_ON(channel->channel >= efx->n_channels);
BUG_ON(!channel->enabled);
BUG_ON(!efx->loopback_selftest);
/* Disable interrupts and wait for ISRs to complete */
efx_nic_disable_interrupts(efx);
if (efx->legacy_irq) {
synchronize_irq(efx->legacy_irq);
efx->legacy_irq_enabled = false;
}
if (channel->irq)
synchronize_irq(channel->irq);
/* Wait for any NAPI processing to complete */
napi_disable(&channel->napi_str);
/* Poll the channel */
efx_process_channel(channel, channel->eventq_mask + 1);
/* Ack the eventq. This may cause an interrupt to be generated
* when they are reenabled */
efx_channel_processed(channel);
napi_enable(&channel->napi_str);
if (efx->legacy_irq)
efx->legacy_irq_enabled = true;
efx_nic_enable_interrupts(efx);
}
/* Create event queue
* Event queue memory allocations are done only once. If the channel
* is reset, the memory buffer will be reused; this guards against
* errors during channel reset and also simplifies interrupt handling.
*/
static int efx_probe_eventq(struct efx_channel *channel)
{
struct efx_nic *efx = channel->efx;
unsigned long entries;
netif_dbg(channel->efx, probe, channel->efx->net_dev,
"chan %d create event queue\n", channel->channel);
/* Build an event queue with room for one event per tx and rx buffer,
* plus some extra for link state events and MCDI completions. */
entries = roundup_pow_of_two(efx->rxq_entries + efx->txq_entries + 128);
EFX_BUG_ON_PARANOID(entries > EFX_MAX_EVQ_SIZE);
channel->eventq_mask = max(entries, EFX_MIN_EVQ_SIZE) - 1;
return efx_nic_probe_eventq(channel);
}
/* Prepare channel's event queue */
static void efx_init_eventq(struct efx_channel *channel)
{
netif_dbg(channel->efx, drv, channel->efx->net_dev,
"chan %d init event queue\n", channel->channel);
channel->eventq_read_ptr = 0;
efx_nic_init_eventq(channel);
}
static void efx_fini_eventq(struct efx_channel *channel)
{
netif_dbg(channel->efx, drv, channel->efx->net_dev,
"chan %d fini event queue\n", channel->channel);
efx_nic_fini_eventq(channel);
}
static void efx_remove_eventq(struct efx_channel *channel)
{
netif_dbg(channel->efx, drv, channel->efx->net_dev,
"chan %d remove event queue\n", channel->channel);
efx_nic_remove_eventq(channel);
}
/**************************************************************************
*
* Channel handling
*
*************************************************************************/
/* Allocate and initialise a channel structure, optionally copying
* parameters (but not resources) from an old channel structure. */
static struct efx_channel *
efx_alloc_channel(struct efx_nic *efx, int i, struct efx_channel *old_channel)
{
struct efx_channel *channel;
struct efx_rx_queue *rx_queue;
struct efx_tx_queue *tx_queue;
int j;
if (old_channel) {
channel = kmalloc(sizeof(*channel), GFP_KERNEL);
if (!channel)
return NULL;
*channel = *old_channel;
channel->napi_dev = NULL;
memset(&channel->eventq, 0, sizeof(channel->eventq));
rx_queue = &channel->rx_queue;
rx_queue->buffer = NULL;
memset(&rx_queue->rxd, 0, sizeof(rx_queue->rxd));
for (j = 0; j < EFX_TXQ_TYPES; j++) {
tx_queue = &channel->tx_queue[j];
if (tx_queue->channel)
tx_queue->channel = channel;
tx_queue->buffer = NULL;
memset(&tx_queue->txd, 0, sizeof(tx_queue->txd));
}
} else {
channel = kzalloc(sizeof(*channel), GFP_KERNEL);
if (!channel)
return NULL;
channel->efx = efx;
channel->channel = i;
for (j = 0; j < EFX_TXQ_TYPES; j++) {
tx_queue = &channel->tx_queue[j];
tx_queue->efx = efx;
tx_queue->queue = i * EFX_TXQ_TYPES + j;
tx_queue->channel = channel;
}
}
rx_queue = &channel->rx_queue;
rx_queue->efx = efx;
setup_timer(&rx_queue->slow_fill, efx_rx_slow_fill,
(unsigned long)rx_queue);
return channel;
}
static int efx_probe_channel(struct efx_channel *channel)
{
struct efx_tx_queue *tx_queue;
struct efx_rx_queue *rx_queue;
int rc;
netif_dbg(channel->efx, probe, channel->efx->net_dev,
"creating channel %d\n", channel->channel);
rc = efx_probe_eventq(channel);
if (rc)
goto fail1;
efx_for_each_channel_tx_queue(tx_queue, channel) {
rc = efx_probe_tx_queue(tx_queue);
if (rc)
goto fail2;
}
efx_for_each_channel_rx_queue(rx_queue, channel) {
rc = efx_probe_rx_queue(rx_queue);
if (rc)
goto fail3;
}
channel->n_rx_frm_trunc = 0;
return 0;
fail3:
efx_for_each_channel_rx_queue(rx_queue, channel)
efx_remove_rx_queue(rx_queue);
fail2:
efx_for_each_channel_tx_queue(tx_queue, channel)
efx_remove_tx_queue(tx_queue);
fail1:
return rc;
}
static void efx_set_channel_names(struct efx_nic *efx)
{
struct efx_channel *channel;
const char *type = "";
int number;
efx_for_each_channel(channel, efx) {
number = channel->channel;
if (efx->n_channels > efx->n_rx_channels) {
if (channel->channel < efx->n_rx_channels) {
type = "-rx";
} else {
type = "-tx";
number -= efx->n_rx_channels;
}
}
snprintf(efx->channel_name[channel->channel],
sizeof(efx->channel_name[0]),
"%s%s-%d", efx->name, type, number);
}
}
static int efx_probe_channels(struct efx_nic *efx)
{
struct efx_channel *channel;
int rc;
/* Restart special buffer allocation */
efx->next_buffer_table = 0;
efx_for_each_channel(channel, efx) {
rc = efx_probe_channel(channel);
if (rc) {
netif_err(efx, probe, efx->net_dev,
"failed to create channel %d\n",
channel->channel);
goto fail;
}
}
efx_set_channel_names(efx);
return 0;
fail:
efx_remove_channels(efx);
return rc;
}
/* Channels are shutdown and reinitialised whilst the NIC is running
* to propagate configuration changes (mtu, checksum offload), or
* to clear hardware error conditions
*/
static void efx_init_channels(struct efx_nic *efx)
{
struct efx_tx_queue *tx_queue;
struct efx_rx_queue *rx_queue;
struct efx_channel *channel;
/* Calculate the rx buffer allocation parameters required to
* support the current MTU, including padding for header
* alignment and overruns.
*/
efx->rx_buffer_len = (max(EFX_PAGE_IP_ALIGN, NET_IP_ALIGN) +
EFX_MAX_FRAME_LEN(efx->net_dev->mtu) +
efx->type->rx_buffer_hash_size +
efx->type->rx_buffer_padding);
efx->rx_buffer_order = get_order(efx->rx_buffer_len +
sizeof(struct efx_rx_page_state));
/* Initialise the channels */
efx_for_each_channel(channel, efx) {
netif_dbg(channel->efx, drv, channel->efx->net_dev,
"init chan %d\n", channel->channel);
efx_init_eventq(channel);
efx_for_each_channel_tx_queue(tx_queue, channel)
efx_init_tx_queue(tx_queue);
/* The rx buffer allocation strategy is MTU dependent */
efx_rx_strategy(channel);
efx_for_each_channel_rx_queue(rx_queue, channel)
efx_init_rx_queue(rx_queue);
WARN_ON(channel->rx_pkt != NULL);
efx_rx_strategy(channel);
}
}
/* This enables event queue processing and packet transmission.
*
* Note that this function is not allowed to fail, since that would
* introduce too much complexity into the suspend/resume path.
*/
static void efx_start_channel(struct efx_channel *channel)
{
struct efx_rx_queue *rx_queue;
netif_dbg(channel->efx, ifup, channel->efx->net_dev,
"starting chan %d\n", channel->channel);
/* The interrupt handler for this channel may set work_pending
* as soon as we enable it. Make sure it's cleared before
* then. Similarly, make sure it sees the enabled flag set. */
channel->work_pending = false;
channel->enabled = true;
smp_wmb();
/* Fill the queues before enabling NAPI */
efx_for_each_channel_rx_queue(rx_queue, channel)
efx_fast_push_rx_descriptors(rx_queue);
napi_enable(&channel->napi_str);
}
/* This disables event queue processing and packet transmission.
* This function does not guarantee that all queue processing
* (e.g. RX refill) is complete.
*/
static void efx_stop_channel(struct efx_channel *channel)
{
if (!channel->enabled)
return;
netif_dbg(channel->efx, ifdown, channel->efx->net_dev,
"stop chan %d\n", channel->channel);
channel->enabled = false;
napi_disable(&channel->napi_str);
}
static void efx_fini_channels(struct efx_nic *efx)
{
struct efx_channel *channel;
struct efx_tx_queue *tx_queue;
struct efx_rx_queue *rx_queue;
int rc;
EFX_ASSERT_RESET_SERIALISED(efx);
BUG_ON(efx->port_enabled);
rc = efx_nic_flush_queues(efx);
if (rc && EFX_WORKAROUND_7803(efx)) {
/* Schedule a reset to recover from the flush failure. The
* descriptor caches reference memory we're about to free,
* but falcon_reconfigure_mac_wrapper() won't reconnect
* the MACs because of the pending reset. */
netif_err(efx, drv, efx->net_dev,
"Resetting to recover from flush failure\n");
efx_schedule_reset(efx, RESET_TYPE_ALL);
} else if (rc) {
netif_err(efx, drv, efx->net_dev, "failed to flush queues\n");
} else {
netif_dbg(efx, drv, efx->net_dev,
"successfully flushed all queues\n");
}
efx_for_each_channel(channel, efx) {
netif_dbg(channel->efx, drv, channel->efx->net_dev,
"shut down chan %d\n", channel->channel);
efx_for_each_channel_rx_queue(rx_queue, channel)
efx_fini_rx_queue(rx_queue);
efx_for_each_possible_channel_tx_queue(tx_queue, channel)
efx_fini_tx_queue(tx_queue);
efx_fini_eventq(channel);
}
}
static void efx_remove_channel(struct efx_channel *channel)
{
struct efx_tx_queue *tx_queue;
struct efx_rx_queue *rx_queue;
netif_dbg(channel->efx, drv, channel->efx->net_dev,
"destroy chan %d\n", channel->channel);
efx_for_each_channel_rx_queue(rx_queue, channel)
efx_remove_rx_queue(rx_queue);
efx_for_each_possible_channel_tx_queue(tx_queue, channel)
efx_remove_tx_queue(tx_queue);
efx_remove_eventq(channel);
}
static void efx_remove_channels(struct efx_nic *efx)
{
struct efx_channel *channel;
efx_for_each_channel(channel, efx)
efx_remove_channel(channel);
}
int
efx_realloc_channels(struct efx_nic *efx, u32 rxq_entries, u32 txq_entries)
{
struct efx_channel *other_channel[EFX_MAX_CHANNELS], *channel;
u32 old_rxq_entries, old_txq_entries;
unsigned i;
int rc;
efx_stop_all(efx);
efx_fini_channels(efx);
/* Clone channels */
memset(other_channel, 0, sizeof(other_channel));
for (i = 0; i < efx->n_channels; i++) {
channel = efx_alloc_channel(efx, i, efx->channel[i]);
if (!channel) {
rc = -ENOMEM;
goto out;
}
other_channel[i] = channel;
}
/* Swap entry counts and channel pointers */
old_rxq_entries = efx->rxq_entries;
old_txq_entries = efx->txq_entries;
efx->rxq_entries = rxq_entries;
efx->txq_entries = txq_entries;
for (i = 0; i < efx->n_channels; i++) {
channel = efx->channel[i];
efx->channel[i] = other_channel[i];
other_channel[i] = channel;
}
rc = efx_probe_channels(efx);
if (rc)
goto rollback;
efx_init_napi(efx);
/* Destroy old channels */
for (i = 0; i < efx->n_channels; i++) {
efx_fini_napi_channel(other_channel[i]);
efx_remove_channel(other_channel[i]);
}
out:
/* Free unused channel structures */
for (i = 0; i < efx->n_channels; i++)
kfree(other_channel[i]);
efx_init_channels(efx);
efx_start_all(efx);
return rc;
rollback:
/* Swap back */
efx->rxq_entries = old_rxq_entries;
efx->txq_entries = old_txq_entries;
for (i = 0; i < efx->n_channels; i++) {
channel = efx->channel[i];
efx->channel[i] = other_channel[i];
other_channel[i] = channel;
}
goto out;
}
void efx_schedule_slow_fill(struct efx_rx_queue *rx_queue)
{
mod_timer(&rx_queue->slow_fill, jiffies + msecs_to_jiffies(100));
}
/**************************************************************************
*
* Port handling
*
**************************************************************************/
/* This ensures that the kernel is kept informed (via
* netif_carrier_on/off) of the link status, and also maintains the
* link status's stop on the port's TX queue.
*/
void efx_link_status_changed(struct efx_nic *efx)
{
struct efx_link_state *link_state = &efx->link_state;
/* SFC Bug 5356: A net_dev notifier is registered, so we must ensure
* that no events are triggered between unregister_netdev() and the
* driver unloading. A more general condition is that NETDEV_CHANGE
* can only be generated between NETDEV_UP and NETDEV_DOWN */
if (!netif_running(efx->net_dev))
return;
if (efx->port_inhibited) {
netif_carrier_off(efx->net_dev);
return;
}
if (link_state->up != netif_carrier_ok(efx->net_dev)) {
efx->n_link_state_changes++;
if (link_state->up)
netif_carrier_on(efx->net_dev);
else
netif_carrier_off(efx->net_dev);
}
/* Status message for kernel log */
if (link_state->up) {
netif_info(efx, link, efx->net_dev,
"link up at %uMbps %s-duplex (MTU %d)%s\n",
link_state->speed, link_state->fd ? "full" : "half",
efx->net_dev->mtu,
(efx->promiscuous ? " [PROMISC]" : ""));
} else {
netif_info(efx, link, efx->net_dev, "link down\n");
}
}
void efx_link_set_advertising(struct efx_nic *efx, u32 advertising)
{
efx->link_advertising = advertising;
if (advertising) {
if (advertising & ADVERTISED_Pause)
efx->wanted_fc |= (EFX_FC_TX | EFX_FC_RX);
else
efx->wanted_fc &= ~(EFX_FC_TX | EFX_FC_RX);
if (advertising & ADVERTISED_Asym_Pause)
efx->wanted_fc ^= EFX_FC_TX;
}
}
void efx_link_set_wanted_fc(struct efx_nic *efx, enum efx_fc_type wanted_fc)
{
efx->wanted_fc = wanted_fc;
if (efx->link_advertising) {
if (wanted_fc & EFX_FC_RX)
efx->link_advertising |= (ADVERTISED_Pause |
ADVERTISED_Asym_Pause);
else
efx->link_advertising &= ~(ADVERTISED_Pause |
ADVERTISED_Asym_Pause);
if (wanted_fc & EFX_FC_TX)
efx->link_advertising ^= ADVERTISED_Asym_Pause;
}
}
static void efx_fini_port(struct efx_nic *efx);
/* Push loopback/power/transmit disable settings to the PHY, and reconfigure
* the MAC appropriately. All other PHY configuration changes are pushed
* through phy_op->set_settings(), and pushed asynchronously to the MAC
* through efx_monitor().
*
* Callers must hold the mac_lock
*/
int __efx_reconfigure_port(struct efx_nic *efx)
{
enum efx_phy_mode phy_mode;
int rc;
WARN_ON(!mutex_is_locked(&efx->mac_lock));
/* Serialise the promiscuous flag with efx_set_multicast_list. */
if (efx_dev_registered(efx)) {
netif_addr_lock_bh(efx->net_dev);
netif_addr_unlock_bh(efx->net_dev);
}
/* Disable PHY transmit in mac level loopbacks */
phy_mode = efx->phy_mode;
if (LOOPBACK_INTERNAL(efx))
efx->phy_mode |= PHY_MODE_TX_DISABLED;
else
efx->phy_mode &= ~PHY_MODE_TX_DISABLED;
rc = efx->type->reconfigure_port(efx);
if (rc)
efx->phy_mode = phy_mode;
return rc;
}
/* Reinitialise the MAC to pick up new PHY settings, even if the port is
* disabled. */
int efx_reconfigure_port(struct efx_nic *efx)
{
int rc;
EFX_ASSERT_RESET_SERIALISED(efx);
mutex_lock(&efx->mac_lock);
rc = __efx_reconfigure_port(efx);
mutex_unlock(&efx->mac_lock);
return rc;
}
/* Asynchronous work item for changing MAC promiscuity and multicast
* hash. Avoid a drain/rx_ingress enable by reconfiguring the current
* MAC directly. */
static void efx_mac_work(struct work_struct *data)
{
struct efx_nic *efx = container_of(data, struct efx_nic, mac_work);
mutex_lock(&efx->mac_lock);
if (efx->port_enabled) {
efx->type->push_multicast_hash(efx);
efx->mac_op->reconfigure(efx);
}
mutex_unlock(&efx->mac_lock);
}
static int efx_probe_port(struct efx_nic *efx)
{
unsigned char *perm_addr;
int rc;
netif_dbg(efx, probe, efx->net_dev, "create port\n");
if (phy_flash_cfg)
efx->phy_mode = PHY_MODE_SPECIAL;
/* Connect up MAC/PHY operations table */
rc = efx->type->probe_port(efx);
if (rc)
return rc;
/* Sanity check MAC address */
perm_addr = efx->net_dev->perm_addr;
if (is_valid_ether_addr(perm_addr)) {
memcpy(efx->net_dev->dev_addr, perm_addr, ETH_ALEN);
} else {
netif_err(efx, probe, efx->net_dev, "invalid MAC address %pM\n",
perm_addr);
if (!allow_bad_hwaddr) {
rc = -EINVAL;
goto err;
}
random_ether_addr(efx->net_dev->dev_addr);
netif_info(efx, probe, efx->net_dev,
"using locally-generated MAC %pM\n",
efx->net_dev->dev_addr);
}
return 0;
err:
efx->type->remove_port(efx);
return rc;
}
static int efx_init_port(struct efx_nic *efx)
{
int rc;
netif_dbg(efx, drv, efx->net_dev, "init port\n");
mutex_lock(&efx->mac_lock);
rc = efx->phy_op->init(efx);
if (rc)
goto fail1;
efx->port_initialized = true;
/* Reconfigure the MAC before creating dma queues (required for
* Falcon/A1 where RX_INGR_EN/TX_DRAIN_EN isn't supported) */
efx->mac_op->reconfigure(efx);
/* Ensure the PHY advertises the correct flow control settings */
rc = efx->phy_op->reconfigure(efx);
if (rc)
goto fail2;
mutex_unlock(&efx->mac_lock);
return 0;
fail2:
efx->phy_op->fini(efx);
fail1:
mutex_unlock(&efx->mac_lock);
return rc;
}
static void efx_start_port(struct efx_nic *efx)
{
netif_dbg(efx, ifup, efx->net_dev, "start port\n");
BUG_ON(efx->port_enabled);
mutex_lock(&efx->mac_lock);
efx->port_enabled = true;
/* efx_mac_work() might have been scheduled after efx_stop_port(),
* and then cancelled by efx_flush_all() */
efx->type->push_multicast_hash(efx);
efx->mac_op->reconfigure(efx);
mutex_unlock(&efx->mac_lock);
}
/* Prevent efx_mac_work() and efx_monitor() from working */
static void efx_stop_port(struct efx_nic *efx)
{
netif_dbg(efx, ifdown, efx->net_dev, "stop port\n");
mutex_lock(&efx->mac_lock);
efx->port_enabled = false;
mutex_unlock(&efx->mac_lock);
/* Serialise against efx_set_multicast_list() */
if (efx_dev_registered(efx)) {
netif_addr_lock_bh(efx->net_dev);
netif_addr_unlock_bh(efx->net_dev);
}
}
static void efx_fini_port(struct efx_nic *efx)
{
netif_dbg(efx, drv, efx->net_dev, "shut down port\n");
if (!efx->port_initialized)
return;
efx->phy_op->fini(efx);
efx->port_initialized = false;
efx->link_state.up = false;
efx_link_status_changed(efx);
}
static void efx_remove_port(struct efx_nic *efx)
{
netif_dbg(efx, drv, efx->net_dev, "destroying port\n");
efx->type->remove_port(efx);
}
/**************************************************************************
*
* NIC handling
*
**************************************************************************/
/* This configures the PCI device to enable I/O and DMA. */
static int efx_init_io(struct efx_nic *efx)
{
struct pci_dev *pci_dev = efx->pci_dev;
dma_addr_t dma_mask = efx->type->max_dma_mask;
bool use_wc;
int rc;
netif_dbg(efx, probe, efx->net_dev, "initialising I/O\n");
rc = pci_enable_device(pci_dev);
if (rc) {
netif_err(efx, probe, efx->net_dev,
"failed to enable PCI device\n");
goto fail1;
}
pci_set_master(pci_dev);
/* Set the PCI DMA mask. Try all possibilities from our
* genuine mask down to 32 bits, because some architectures
* (e.g. x86_64 with iommu_sac_force set) will allow 40 bit
* masks event though they reject 46 bit masks.
*/
while (dma_mask > 0x7fffffffUL) {
if (pci_dma_supported(pci_dev, dma_mask) &&
((rc = pci_set_dma_mask(pci_dev, dma_mask)) == 0))
break;
dma_mask >>= 1;
}
if (rc) {
netif_err(efx, probe, efx->net_dev,
"could not find a suitable DMA mask\n");
goto fail2;
}
netif_dbg(efx, probe, efx->net_dev,
"using DMA mask %llx\n", (unsigned long long) dma_mask);
rc = pci_set_consistent_dma_mask(pci_dev, dma_mask);
if (rc) {
/* pci_set_consistent_dma_mask() is not *allowed* to
* fail with a mask that pci_set_dma_mask() accepted,
* but just in case...
*/
netif_err(efx, probe, efx->net_dev,
"failed to set consistent DMA mask\n");
goto fail2;
}
efx->membase_phys = pci_resource_start(efx->pci_dev, EFX_MEM_BAR);
rc = pci_request_region(pci_dev, EFX_MEM_BAR, "sfc");
if (rc) {
netif_err(efx, probe, efx->net_dev,
"request for memory BAR failed\n");
rc = -EIO;
goto fail3;
}
/* bug22643: If SR-IOV is enabled then tx push over a write combined
* mapping is unsafe. We need to disable write combining in this case.
* MSI is unsupported when SR-IOV is enabled, and the firmware will
* have removed the MSI capability. So write combining is safe if
* there is an MSI capability.
*/
use_wc = (!EFX_WORKAROUND_22643(efx) ||
pci_find_capability(pci_dev, PCI_CAP_ID_MSI));
if (use_wc)
efx->membase = ioremap_wc(efx->membase_phys,
efx->type->mem_map_size);
else
efx->membase = ioremap_nocache(efx->membase_phys,
efx->type->mem_map_size);
if (!efx->membase) {
netif_err(efx, probe, efx->net_dev,
"could not map memory BAR at %llx+%x\n",
(unsigned long long)efx->membase_phys,
efx->type->mem_map_size);
rc = -ENOMEM;
goto fail4;
}
netif_dbg(efx, probe, efx->net_dev,
"memory BAR at %llx+%x (virtual %p)\n",
(unsigned long long)efx->membase_phys,
efx->type->mem_map_size, efx->membase);
return 0;
fail4:
pci_release_region(efx->pci_dev, EFX_MEM_BAR);
fail3:
efx->membase_phys = 0;
fail2:
pci_disable_device(efx->pci_dev);
fail1:
return rc;
}
static void efx_fini_io(struct efx_nic *efx)
{
netif_dbg(efx, drv, efx->net_dev, "shutting down I/O\n");
if (efx->membase) {
iounmap(efx->membase);
efx->membase = NULL;
}
if (efx->membase_phys) {
pci_release_region(efx->pci_dev, EFX_MEM_BAR);
efx->membase_phys = 0;
}
pci_disable_device(efx->pci_dev);
}
/* Get number of channels wanted. Each channel will have its own IRQ,
* 1 RX queue and/or 2 TX queues. */
static int efx_wanted_channels(void)
{
cpumask_var_t core_mask;
int count;
int cpu;
if (rss_cpus)
return rss_cpus;
if (unlikely(!zalloc_cpumask_var(&core_mask, GFP_KERNEL))) {
printk(KERN_WARNING
"sfc: RSS disabled due to allocation failure\n");
return 1;
}
count = 0;
for_each_online_cpu(cpu) {
if (!cpumask_test_cpu(cpu, core_mask)) {
++count;
cpumask_or(core_mask, core_mask,
topology_core_cpumask(cpu));
}
}
free_cpumask_var(core_mask);
return count;
}
static int
efx_init_rx_cpu_rmap(struct efx_nic *efx, struct msix_entry *xentries)
{
#ifdef CONFIG_RFS_ACCEL
int i, rc;
efx->net_dev->rx_cpu_rmap = alloc_irq_cpu_rmap(efx->n_rx_channels);
if (!efx->net_dev->rx_cpu_rmap)
return -ENOMEM;
for (i = 0; i < efx->n_rx_channels; i++) {
rc = irq_cpu_rmap_add(efx->net_dev->rx_cpu_rmap,
xentries[i].vector);
if (rc) {
free_irq_cpu_rmap(efx->net_dev->rx_cpu_rmap);
efx->net_dev->rx_cpu_rmap = NULL;
return rc;
}
}
#endif
return 0;
}
/* Probe the number and type of interrupts we are able to obtain, and
* the resulting numbers of channels and RX queues.
*/
static int efx_probe_interrupts(struct efx_nic *efx)
{
int max_channels =
min_t(int, efx->type->phys_addr_channels, EFX_MAX_CHANNELS);
int rc, i;
if (efx->interrupt_mode == EFX_INT_MODE_MSIX) {
struct msix_entry xentries[EFX_MAX_CHANNELS];
int n_channels;
n_channels = efx_wanted_channels();
if (separate_tx_channels)
n_channels *= 2;
n_channels = min(n_channels, max_channels);
for (i = 0; i < n_channels; i++)
xentries[i].entry = i;
rc = pci_enable_msix(efx->pci_dev, xentries, n_channels);
if (rc > 0) {
netif_err(efx, drv, efx->net_dev,
"WARNING: Insufficient MSI-X vectors"
" available (%d < %d).\n", rc, n_channels);
netif_err(efx, drv, efx->net_dev,
"WARNING: Performance may be reduced.\n");
EFX_BUG_ON_PARANOID(rc >= n_channels);
n_channels = rc;
rc = pci_enable_msix(efx->pci_dev, xentries,
n_channels);
}
if (rc == 0) {
efx->n_channels = n_channels;
if (separate_tx_channels) {
efx->n_tx_channels =
max(efx->n_channels / 2, 1U);
efx->n_rx_channels =
max(efx->n_channels -
efx->n_tx_channels, 1U);
} else {
efx->n_tx_channels = efx->n_channels;
efx->n_rx_channels = efx->n_channels;
}
rc = efx_init_rx_cpu_rmap(efx, xentries);
if (rc) {
pci_disable_msix(efx->pci_dev);
return rc;
}
for (i = 0; i < n_channels; i++)
efx_get_channel(efx, i)->irq =
xentries[i].vector;
} else {
/* Fall back to single channel MSI */
efx->interrupt_mode = EFX_INT_MODE_MSI;
netif_err(efx, drv, efx->net_dev,
"could not enable MSI-X\n");
}
}
/* Try single interrupt MSI */
if (efx->interrupt_mode == EFX_INT_MODE_MSI) {
efx->n_channels = 1;
efx->n_rx_channels = 1;
efx->n_tx_channels = 1;
rc = pci_enable_msi(efx->pci_dev);
if (rc == 0) {
efx_get_channel(efx, 0)->irq = efx->pci_dev->irq;
} else {
netif_err(efx, drv, efx->net_dev,
"could not enable MSI\n");
efx->interrupt_mode = EFX_INT_MODE_LEGACY;
}
}
/* Assume legacy interrupts */
if (efx->interrupt_mode == EFX_INT_MODE_LEGACY) {
efx->n_channels = 1 + (separate_tx_channels ? 1 : 0);
efx->n_rx_channels = 1;
efx->n_tx_channels = 1;
efx->legacy_irq = efx->pci_dev->irq;
}
return 0;
}
static void efx_remove_interrupts(struct efx_nic *efx)
{
struct efx_channel *channel;
/* Remove MSI/MSI-X interrupts */
efx_for_each_channel(channel, efx)
channel->irq = 0;
pci_disable_msi(efx->pci_dev);
pci_disable_msix(efx->pci_dev);
/* Remove legacy interrupt */
efx->legacy_irq = 0;
}
static void efx_set_channels(struct efx_nic *efx)
{
efx->tx_channel_offset =
separate_tx_channels ? efx->n_channels - efx->n_tx_channels : 0;
}
static int efx_probe_nic(struct efx_nic *efx)
{
size_t i;
int rc;
netif_dbg(efx, probe, efx->net_dev, "creating NIC\n");
/* Carry out hardware-type specific initialisation */
rc = efx->type->probe(efx);
if (rc)
return rc;
/* Determine the number of channels and queues by trying to hook
* in MSI-X interrupts. */
rc = efx_probe_interrupts(efx);
if (rc)
goto fail;
if (efx->n_channels > 1)
get_random_bytes(&efx->rx_hash_key, sizeof(efx->rx_hash_key));
for (i = 0; i < ARRAY_SIZE(efx->rx_indir_table); i++)
efx->rx_indir_table[i] = i % efx->n_rx_channels;
efx_set_channels(efx);
netif_set_real_num_tx_queues(efx->net_dev, efx->n_tx_channels);
netif_set_real_num_rx_queues(efx->net_dev, efx->n_rx_channels);
/* Initialise the interrupt moderation settings */
efx_init_irq_moderation(efx, tx_irq_mod_usec, rx_irq_mod_usec, true);
return 0;
fail:
efx->type->remove(efx);
return rc;
}
static void efx_remove_nic(struct efx_nic *efx)
{
netif_dbg(efx, drv, efx->net_dev, "destroying NIC\n");
efx_remove_interrupts(efx);
efx->type->remove(efx);
}
/**************************************************************************
*
* NIC startup/shutdown
*
*************************************************************************/
static int efx_probe_all(struct efx_nic *efx)
{
int rc;
rc = efx_probe_nic(efx);
if (rc) {
netif_err(efx, probe, efx->net_dev, "failed to create NIC\n");
goto fail1;
}
rc = efx_probe_port(efx);
if (rc) {
netif_err(efx, probe, efx->net_dev, "failed to create port\n");
goto fail2;
}
efx->rxq_entries = efx->txq_entries = EFX_DEFAULT_DMAQ_SIZE;
rc = efx_probe_channels(efx);
if (rc)
goto fail3;
rc = efx_probe_filters(efx);
if (rc) {
netif_err(efx, probe, efx->net_dev,
"failed to create filter tables\n");
goto fail4;
}
return 0;
fail4:
efx_remove_channels(efx);
fail3:
efx_remove_port(efx);
fail2:
efx_remove_nic(efx);
fail1:
return rc;
}
/* Called after previous invocation(s) of efx_stop_all, restarts the
* port, kernel transmit queue, NAPI processing and hardware interrupts,
* and ensures that the port is scheduled to be reconfigured.
* This function is safe to call multiple times when the NIC is in any
* state. */
static void efx_start_all(struct efx_nic *efx)
{
struct efx_channel *channel;
EFX_ASSERT_RESET_SERIALISED(efx);
/* Check that it is appropriate to restart the interface. All
* of these flags are safe to read under just the rtnl lock */
if (efx->port_enabled)
return;
if ((efx->state != STATE_RUNNING) && (efx->state != STATE_INIT))
return;
if (efx_dev_registered(efx) && !netif_running(efx->net_dev))
return;
/* Mark the port as enabled so port reconfigurations can start, then
* restart the transmit interface early so the watchdog timer stops */
efx_start_port(efx);
if (efx_dev_registered(efx) && !efx->port_inhibited)
netif_tx_wake_all_queues(efx->net_dev);
efx_for_each_channel(channel, efx)
efx_start_channel(channel);
if (efx->legacy_irq)
efx->legacy_irq_enabled = true;
efx_nic_enable_interrupts(efx);
/* Switch to event based MCDI completions after enabling interrupts.
* If a reset has been scheduled, then we need to stay in polled mode.
* Rather than serialising efx_mcdi_mode_event() [which sleeps] and
* reset_pending [modified from an atomic context], we instead guarantee
* that efx_mcdi_mode_poll() isn't reverted erroneously */
efx_mcdi_mode_event(efx);
if (efx->reset_pending != RESET_TYPE_NONE)
efx_mcdi_mode_poll(efx);
/* Start the hardware monitor if there is one. Otherwise (we're link
* event driven), we have to poll the PHY because after an event queue
* flush, we could have a missed a link state change */
if (efx->type->monitor != NULL) {
queue_delayed_work(efx->workqueue, &efx->monitor_work,
efx_monitor_interval);
} else {
mutex_lock(&efx->mac_lock);
if (efx->phy_op->poll(efx))
efx_link_status_changed(efx);
mutex_unlock(&efx->mac_lock);
}
efx->type->start_stats(efx);
}
/* Flush all delayed work. Should only be called when no more delayed work
* will be scheduled. This doesn't flush pending online resets (efx_reset),
* since we're holding the rtnl_lock at this point. */
static void efx_flush_all(struct efx_nic *efx)
{
/* Make sure the hardware monitor is stopped */
cancel_delayed_work_sync(&efx->monitor_work);
/* Stop scheduled port reconfigurations */
cancel_work_sync(&efx->mac_work);
}
/* Quiesce hardware and software without bringing the link down.
* Safe to call multiple times, when the nic and interface is in any
* state. The caller is guaranteed to subsequently be in a position
* to modify any hardware and software state they see fit without
* taking locks. */
static void efx_stop_all(struct efx_nic *efx)
{
struct efx_channel *channel;
EFX_ASSERT_RESET_SERIALISED(efx);
/* port_enabled can be read safely under the rtnl lock */
if (!efx->port_enabled)
return;
efx->type->stop_stats(efx);
/* Switch to MCDI polling on Siena before disabling interrupts */
efx_mcdi_mode_poll(efx);
/* Disable interrupts and wait for ISR to complete */
efx_nic_disable_interrupts(efx);
if (efx->legacy_irq) {
synchronize_irq(efx->legacy_irq);
efx->legacy_irq_enabled = false;
}
efx_for_each_channel(channel, efx) {
if (channel->irq)
synchronize_irq(channel->irq);
}
/* Stop all NAPI processing and synchronous rx refills */
efx_for_each_channel(channel, efx)
efx_stop_channel(channel);
/* Stop all asynchronous port reconfigurations. Since all
* event processing has already been stopped, there is no
* window to loose phy events */
efx_stop_port(efx);
/* Flush efx_mac_work(), refill_workqueue, monitor_work */
efx_flush_all(efx);
/* Stop the kernel transmit interface late, so the watchdog
* timer isn't ticking over the flush */
if (efx_dev_registered(efx)) {
netif_tx_stop_all_queues(efx->net_dev);
netif_tx_lock_bh(efx->net_dev);
netif_tx_unlock_bh(efx->net_dev);
}
}
static void efx_remove_all(struct efx_nic *efx)
{
efx_remove_filters(efx);
efx_remove_channels(efx);
efx_remove_port(efx);
efx_remove_nic(efx);
}
/**************************************************************************
*
* Interrupt moderation
*
**************************************************************************/
static unsigned irq_mod_ticks(int usecs, int resolution)
{
if (usecs <= 0)
return 0; /* cannot receive interrupts ahead of time :-) */
if (usecs < resolution)
return 1; /* never round down to 0 */
return usecs / resolution;
}
/* Set interrupt moderation parameters */
void efx_init_irq_moderation(struct efx_nic *efx, int tx_usecs, int rx_usecs,
bool rx_adaptive)
{
struct efx_channel *channel;
unsigned tx_ticks = irq_mod_ticks(tx_usecs, EFX_IRQ_MOD_RESOLUTION);
unsigned rx_ticks = irq_mod_ticks(rx_usecs, EFX_IRQ_MOD_RESOLUTION);
EFX_ASSERT_RESET_SERIALISED(efx);
efx->irq_rx_adaptive = rx_adaptive;
efx->irq_rx_moderation = rx_ticks;
efx_for_each_channel(channel, efx) {
if (efx_channel_has_rx_queue(channel))
channel->irq_moderation = rx_ticks;
else if (efx_channel_has_tx_queues(channel))
channel->irq_moderation = tx_ticks;
}
}
/**************************************************************************
*
* Hardware monitor
*
**************************************************************************/
/* Run periodically off the general workqueue */
static void efx_monitor(struct work_struct *data)
{
struct efx_nic *efx = container_of(data, struct efx_nic,
monitor_work.work);
netif_vdbg(efx, timer, efx->net_dev,
"hardware monitor executing on CPU %d\n",
raw_smp_processor_id());
BUG_ON(efx->type->monitor == NULL);
/* If the mac_lock is already held then it is likely a port
* reconfiguration is already in place, which will likely do
* most of the work of monitor() anyway. */
if (mutex_trylock(&efx->mac_lock)) {
if (efx->port_enabled)
efx->type->monitor(efx);
mutex_unlock(&efx->mac_lock);
}
queue_delayed_work(efx->workqueue, &efx->monitor_work,
efx_monitor_interval);
}
/**************************************************************************
*
* ioctls
*
*************************************************************************/
/* Net device ioctl
* Context: process, rtnl_lock() held.
*/
static int efx_ioctl(struct net_device *net_dev, struct ifreq *ifr, int cmd)
{
struct efx_nic *efx = netdev_priv(net_dev);
struct mii_ioctl_data *data = if_mii(ifr);
EFX_ASSERT_RESET_SERIALISED(efx);
/* Convert phy_id from older PRTAD/DEVAD format */
if ((cmd == SIOCGMIIREG || cmd == SIOCSMIIREG) &&
(data->phy_id & 0xfc00) == 0x0400)
data->phy_id ^= MDIO_PHY_ID_C45 | 0x0400;
return mdio_mii_ioctl(&efx->mdio, data, cmd);
}
/**************************************************************************
*
* NAPI interface
*
**************************************************************************/
static void efx_init_napi(struct efx_nic *efx)
{
struct efx_channel *channel;
efx_for_each_channel(channel, efx) {
channel->napi_dev = efx->net_dev;
netif_napi_add(channel->napi_dev, &channel->napi_str,
efx_poll, napi_weight);
}
}
static void efx_fini_napi_channel(struct efx_channel *channel)
{
if (channel->napi_dev)
netif_napi_del(&channel->napi_str);
channel->napi_dev = NULL;
}
static void efx_fini_napi(struct efx_nic *efx)
{
struct efx_channel *channel;
efx_for_each_channel(channel, efx)
efx_fini_napi_channel(channel);
}
/**************************************************************************
*
* Kernel netpoll interface
*
*************************************************************************/
#ifdef CONFIG_NET_POLL_CONTROLLER
/* Although in the common case interrupts will be disabled, this is not
* guaranteed. However, all our work happens inside the NAPI callback,
* so no locking is required.
*/
static void efx_netpoll(struct net_device *net_dev)
{
struct efx_nic *efx = netdev_priv(net_dev);
struct efx_channel *channel;
efx_for_each_channel(channel, efx)
efx_schedule_channel(channel);
}
#endif
/**************************************************************************
*
* Kernel net device interface
*
*************************************************************************/
/* Context: process, rtnl_lock() held. */
static int efx_net_open(struct net_device *net_dev)
{
struct efx_nic *efx = netdev_priv(net_dev);
EFX_ASSERT_RESET_SERIALISED(efx);
netif_dbg(efx, ifup, efx->net_dev, "opening device on CPU %d\n",
raw_smp_processor_id());
if (efx->state == STATE_DISABLED)
return -EIO;
if (efx->phy_mode & PHY_MODE_SPECIAL)
return -EBUSY;
if (efx_mcdi_poll_reboot(efx) && efx_reset(efx, RESET_TYPE_ALL))
return -EIO;
/* Notify the kernel of the link state polled during driver load,
* before the monitor starts running */
efx_link_status_changed(efx);
efx_start_all(efx);
return 0;
}
/* Context: process, rtnl_lock() held.
* Note that the kernel will ignore our return code; this method
* should really be a void.
*/
static int efx_net_stop(struct net_device *net_dev)
{
struct efx_nic *efx = netdev_priv(net_dev);
netif_dbg(efx, ifdown, efx->net_dev, "closing on CPU %d\n",
raw_smp_processor_id());
if (efx->state != STATE_DISABLED) {
/* Stop the device and flush all the channels */
efx_stop_all(efx);
efx_fini_channels(efx);
efx_init_channels(efx);
}
return 0;
}
/* Context: process, dev_base_lock or RTNL held, non-blocking. */
static struct rtnl_link_stats64 *efx_net_stats(struct net_device *net_dev, struct rtnl_link_stats64 *stats)
{
struct efx_nic *efx = netdev_priv(net_dev);
struct efx_mac_stats *mac_stats = &efx->mac_stats;
spin_lock_bh(&efx->stats_lock);
efx->type->update_stats(efx);
spin_unlock_bh(&efx->stats_lock);
stats->rx_packets = mac_stats->rx_packets;
stats->tx_packets = mac_stats->tx_packets;
stats->rx_bytes = mac_stats->rx_bytes;
stats->tx_bytes = mac_stats->tx_bytes;
stats->rx_dropped = efx->n_rx_nodesc_drop_cnt;
stats->multicast = mac_stats->rx_multicast;
stats->collisions = mac_stats->tx_collision;
stats->rx_length_errors = (mac_stats->rx_gtjumbo +
mac_stats->rx_length_error);
stats->rx_crc_errors = mac_stats->rx_bad;
stats->rx_frame_errors = mac_stats->rx_align_error;
stats->rx_fifo_errors = mac_stats->rx_overflow;
stats->rx_missed_errors = mac_stats->rx_missed;
stats->tx_window_errors = mac_stats->tx_late_collision;
stats->rx_errors = (stats->rx_length_errors +
stats->rx_crc_errors +
stats->rx_frame_errors +
mac_stats->rx_symbol_error);
stats->tx_errors = (stats->tx_window_errors +
mac_stats->tx_bad);
return stats;
}
/* Context: netif_tx_lock held, BHs disabled. */
static void efx_watchdog(struct net_device *net_dev)
{
struct efx_nic *efx = netdev_priv(net_dev);
netif_err(efx, tx_err, efx->net_dev,
"TX stuck with port_enabled=%d: resetting channels\n",
efx->port_enabled);
efx_schedule_reset(efx, RESET_TYPE_TX_WATCHDOG);
}
/* Context: process, rtnl_lock() held. */
static int efx_change_mtu(struct net_device *net_dev, int new_mtu)
{
struct efx_nic *efx = netdev_priv(net_dev);
int rc = 0;
EFX_ASSERT_RESET_SERIALISED(efx);
if (new_mtu > EFX_MAX_MTU)
return -EINVAL;
efx_stop_all(efx);
netif_dbg(efx, drv, efx->net_dev, "changing MTU to %d\n", new_mtu);
efx_fini_channels(efx);
mutex_lock(&efx->mac_lock);
/* Reconfigure the MAC before enabling the dma queues so that
* the RX buffers don't overflow */
net_dev->mtu = new_mtu;
efx->mac_op->reconfigure(efx);
mutex_unlock(&efx->mac_lock);
efx_init_channels(efx);
efx_start_all(efx);
return rc;
}
static int efx_set_mac_address(struct net_device *net_dev, void *data)
{
struct efx_nic *efx = netdev_priv(net_dev);
struct sockaddr *addr = data;
char *new_addr = addr->sa_data;
EFX_ASSERT_RESET_SERIALISED(efx);
if (!is_valid_ether_addr(new_addr)) {
netif_err(efx, drv, efx->net_dev,
"invalid ethernet MAC address requested: %pM\n",
new_addr);
return -EINVAL;
}
memcpy(net_dev->dev_addr, new_addr, net_dev->addr_len);
/* Reconfigure the MAC */
mutex_lock(&efx->mac_lock);
efx->mac_op->reconfigure(efx);
mutex_unlock(&efx->mac_lock);
return 0;
}
/* Context: netif_addr_lock held, BHs disabled. */
static void efx_set_multicast_list(struct net_device *net_dev)
{
struct efx_nic *efx = netdev_priv(net_dev);
struct netdev_hw_addr *ha;
union efx_multicast_hash *mc_hash = &efx->multicast_hash;
u32 crc;
int bit;
efx->promiscuous = !!(net_dev->flags & IFF_PROMISC);
/* Build multicast hash table */
if (efx->promiscuous || (net_dev->flags & IFF_ALLMULTI)) {
memset(mc_hash, 0xff, sizeof(*mc_hash));
} else {
memset(mc_hash, 0x00, sizeof(*mc_hash));
netdev_for_each_mc_addr(ha, net_dev) {
crc = ether_crc_le(ETH_ALEN, ha->addr);
bit = crc & (EFX_MCAST_HASH_ENTRIES - 1);
set_bit_le(bit, mc_hash->byte);
}
/* Broadcast packets go through the multicast hash filter.
* ether_crc_le() of the broadcast address is 0xbe2612ff
* so we always add bit 0xff to the mask.
*/
set_bit_le(0xff, mc_hash->byte);
}
if (efx->port_enabled)
queue_work(efx->workqueue, &efx->mac_work);
/* Otherwise efx_start_port() will do this */
}
static const struct net_device_ops efx_netdev_ops = {
.ndo_open = efx_net_open,
.ndo_stop = efx_net_stop,
.ndo_get_stats64 = efx_net_stats,
.ndo_tx_timeout = efx_watchdog,
.ndo_start_xmit = efx_hard_start_xmit,
.ndo_validate_addr = eth_validate_addr,
.ndo_do_ioctl = efx_ioctl,
.ndo_change_mtu = efx_change_mtu,
.ndo_set_mac_address = efx_set_mac_address,
.ndo_set_multicast_list = efx_set_multicast_list,
#ifdef CONFIG_NET_POLL_CONTROLLER
.ndo_poll_controller = efx_netpoll,
#endif
.ndo_setup_tc = efx_setup_tc,
#ifdef CONFIG_RFS_ACCEL
.ndo_rx_flow_steer = efx_filter_rfs,
#endif
};
static void efx_update_name(struct efx_nic *efx)
{
strcpy(efx->name, efx->net_dev->name);
efx_mtd_rename(efx);
efx_set_channel_names(efx);
}
static int efx_netdev_event(struct notifier_block *this,
unsigned long event, void *ptr)
{
struct net_device *net_dev = ptr;
if (net_dev->netdev_ops == &efx_netdev_ops &&
event == NETDEV_CHANGENAME)
efx_update_name(netdev_priv(net_dev));
return NOTIFY_DONE;
}
static struct notifier_block efx_netdev_notifier = {
.notifier_call = efx_netdev_event,
};
static ssize_t
show_phy_type(struct device *dev, struct device_attribute *attr, char *buf)
{
struct efx_nic *efx = pci_get_drvdata(to_pci_dev(dev));
return sprintf(buf, "%d\n", efx->phy_type);
}
static DEVICE_ATTR(phy_type, 0644, show_phy_type, NULL);
static int efx_register_netdev(struct efx_nic *efx)
{
struct net_device *net_dev = efx->net_dev;
struct efx_channel *channel;
int rc;
net_dev->watchdog_timeo = 5 * HZ;
net_dev->irq = efx->pci_dev->irq;
net_dev->netdev_ops = &efx_netdev_ops;
SET_ETHTOOL_OPS(net_dev, &efx_ethtool_ops);
/* Clear MAC statistics */
efx->mac_op->update_stats(efx);
memset(&efx->mac_stats, 0, sizeof(efx->mac_stats));
rtnl_lock();
rc = dev_alloc_name(net_dev, net_dev->name);
if (rc < 0)
goto fail_locked;
efx_update_name(efx);
rc = register_netdevice(net_dev);
if (rc)
goto fail_locked;
efx_for_each_channel(channel, efx) {
struct efx_tx_queue *tx_queue;
efx_for_each_channel_tx_queue(tx_queue, channel)
efx_init_tx_queue_core_txq(tx_queue);
}
/* Always start with carrier off; PHY events will detect the link */
netif_carrier_off(efx->net_dev);
rtnl_unlock();
rc = device_create_file(&efx->pci_dev->dev, &dev_attr_phy_type);
if (rc) {
netif_err(efx, drv, efx->net_dev,
"failed to init net dev attributes\n");
goto fail_registered;
}
return 0;
fail_locked:
rtnl_unlock();
netif_err(efx, drv, efx->net_dev, "could not register net dev\n");
return rc;
fail_registered:
unregister_netdev(net_dev);
return rc;
}
static void efx_unregister_netdev(struct efx_nic *efx)
{
struct efx_channel *channel;
struct efx_tx_queue *tx_queue;
if (!efx->net_dev)
return;
BUG_ON(netdev_priv(efx->net_dev) != efx);
/* Free up any skbs still remaining. This has to happen before
* we try to unregister the netdev as running their destructors
* may be needed to get the device ref. count to 0. */
efx_for_each_channel(channel, efx) {
efx_for_each_channel_tx_queue(tx_queue, channel)
efx_release_tx_buffers(tx_queue);
}
if (efx_dev_registered(efx)) {
strlcpy(efx->name, pci_name(efx->pci_dev), sizeof(efx->name));
device_remove_file(&efx->pci_dev->dev, &dev_attr_phy_type);
unregister_netdev(efx->net_dev);
}
}
/**************************************************************************
*
* Device reset and suspend
*
**************************************************************************/
/* Tears down the entire software state and most of the hardware state
* before reset. */
void efx_reset_down(struct efx_nic *efx, enum reset_type method)
{
EFX_ASSERT_RESET_SERIALISED(efx);
efx_stop_all(efx);
mutex_lock(&efx->mac_lock);
efx_fini_channels(efx);
if (efx->port_initialized && method != RESET_TYPE_INVISIBLE)
efx->phy_op->fini(efx);
efx->type->fini(efx);
}
/* This function will always ensure that the locks acquired in
* efx_reset_down() are released. A failure return code indicates
* that we were unable to reinitialise the hardware, and the
* driver should be disabled. If ok is false, then the rx and tx
* engines are not restarted, pending a RESET_DISABLE. */
int efx_reset_up(struct efx_nic *efx, enum reset_type method, bool ok)
{
int rc;
EFX_ASSERT_RESET_SERIALISED(efx);
rc = efx->type->init(efx);
if (rc) {
netif_err(efx, drv, efx->net_dev, "failed to initialise NIC\n");
goto fail;
}
if (!ok)
goto fail;
if (efx->port_initialized && method != RESET_TYPE_INVISIBLE) {
rc = efx->phy_op->init(efx);
if (rc)
goto fail;
if (efx->phy_op->reconfigure(efx))
netif_err(efx, drv, efx->net_dev,
"could not restore PHY settings\n");
}
efx->mac_op->reconfigure(efx);
efx_init_channels(efx);
efx_restore_filters(efx);
mutex_unlock(&efx->mac_lock);
efx_start_all(efx);
return 0;
fail:
efx->port_initialized = false;
mutex_unlock(&efx->mac_lock);
return rc;
}
/* Reset the NIC using the specified method. Note that the reset may
* fail, in which case the card will be left in an unusable state.
*
* Caller must hold the rtnl_lock.
*/
int efx_reset(struct efx_nic *efx, enum reset_type method)
{
int rc, rc2;
bool disabled;
netif_info(efx, drv, efx->net_dev, "resetting (%s)\n",
RESET_TYPE(method));
efx_reset_down(efx, method);
rc = efx->type->reset(efx, method);
if (rc) {
netif_err(efx, drv, efx->net_dev, "failed to reset hardware\n");
goto out;
}
/* Allow resets to be rescheduled. */
efx->reset_pending = RESET_TYPE_NONE;
/* Reinitialise bus-mastering, which may have been turned off before
* the reset was scheduled. This is still appropriate, even in the
* RESET_TYPE_DISABLE since this driver generally assumes the hardware
* can respond to requests. */
pci_set_master(efx->pci_dev);
out:
/* Leave device stopped if necessary */
disabled = rc || method == RESET_TYPE_DISABLE;
rc2 = efx_reset_up(efx, method, !disabled);
if (rc2) {
disabled = true;
if (!rc)
rc = rc2;
}
if (disabled) {
dev_close(efx->net_dev);
netif_err(efx, drv, efx->net_dev, "has been disabled\n");
efx->state = STATE_DISABLED;
} else {
netif_dbg(efx, drv, efx->net_dev, "reset complete\n");
}
return rc;
}
/* The worker thread exists so that code that cannot sleep can
* schedule a reset for later.
*/
static void efx_reset_work(struct work_struct *data)
{
struct efx_nic *efx = container_of(data, struct efx_nic, reset_work);
if (efx->reset_pending == RESET_TYPE_NONE)
return;
/* If we're not RUNNING then don't reset. Leave the reset_pending
* flag set so that efx_pci_probe_main will be retried */
if (efx->state != STATE_RUNNING) {
netif_info(efx, drv, efx->net_dev,
"scheduled reset quenched. NIC not RUNNING\n");
return;
}
rtnl_lock();
(void)efx_reset(efx, efx->reset_pending);
rtnl_unlock();
}
void efx_schedule_reset(struct efx_nic *efx, enum reset_type type)
{
enum reset_type method;
if (efx->reset_pending != RESET_TYPE_NONE) {
netif_info(efx, drv, efx->net_dev,
"quenching already scheduled reset\n");
return;
}
switch (type) {
case RESET_TYPE_INVISIBLE:
case RESET_TYPE_ALL:
case RESET_TYPE_WORLD:
case RESET_TYPE_DISABLE:
method = type;
break;
case RESET_TYPE_RX_RECOVERY:
case RESET_TYPE_RX_DESC_FETCH:
case RESET_TYPE_TX_DESC_FETCH:
case RESET_TYPE_TX_SKIP:
method = RESET_TYPE_INVISIBLE;
break;
case RESET_TYPE_MC_FAILURE:
default:
method = RESET_TYPE_ALL;
break;
}
if (method != type)
netif_dbg(efx, drv, efx->net_dev,
"scheduling %s reset for %s\n",
RESET_TYPE(method), RESET_TYPE(type));
else
netif_dbg(efx, drv, efx->net_dev, "scheduling %s reset\n",
RESET_TYPE(method));
efx->reset_pending = method;
/* efx_process_channel() will no longer read events once a
* reset is scheduled. So switch back to poll'd MCDI completions. */
efx_mcdi_mode_poll(efx);
queue_work(reset_workqueue, &efx->reset_work);
}
/**************************************************************************
*
* List of NICs we support
*
**************************************************************************/
/* PCI device ID table */
static DEFINE_PCI_DEVICE_TABLE(efx_pci_table) = {
{PCI_DEVICE(EFX_VENDID_SFC, FALCON_A_P_DEVID),
.driver_data = (unsigned long) &falcon_a1_nic_type},
{PCI_DEVICE(EFX_VENDID_SFC, FALCON_B_P_DEVID),
.driver_data = (unsigned long) &falcon_b0_nic_type},
{PCI_DEVICE(EFX_VENDID_SFC, BETHPAGE_A_P_DEVID),
.driver_data = (unsigned long) &siena_a0_nic_type},
{PCI_DEVICE(EFX_VENDID_SFC, SIENA_A_P_DEVID),
.driver_data = (unsigned long) &siena_a0_nic_type},
{0} /* end of list */
};
/**************************************************************************
*
* Dummy PHY/MAC operations
*
* Can be used for some unimplemented operations
* Needed so all function pointers are valid and do not have to be tested
* before use
*
**************************************************************************/
int efx_port_dummy_op_int(struct efx_nic *efx)
{
return 0;
}
void efx_port_dummy_op_void(struct efx_nic *efx) {}
static bool efx_port_dummy_op_poll(struct efx_nic *efx)
{
return false;
}
static struct efx_phy_operations efx_dummy_phy_operations = {
.init = efx_port_dummy_op_int,
.reconfigure = efx_port_dummy_op_int,
.poll = efx_port_dummy_op_poll,
.fini = efx_port_dummy_op_void,
};
/**************************************************************************
*
* Data housekeeping
*
**************************************************************************/
/* This zeroes out and then fills in the invariants in a struct
* efx_nic (including all sub-structures).
*/
static int efx_init_struct(struct efx_nic *efx, struct efx_nic_type *type,
struct pci_dev *pci_dev, struct net_device *net_dev)
{
int i;
/* Initialise common structures */
memset(efx, 0, sizeof(*efx));
spin_lock_init(&efx->biu_lock);
#ifdef CONFIG_SFC_MTD
INIT_LIST_HEAD(&efx->mtd_list);
#endif
INIT_WORK(&efx->reset_work, efx_reset_work);
INIT_DELAYED_WORK(&efx->monitor_work, efx_monitor);
efx->pci_dev = pci_dev;
efx->msg_enable = debug;
efx->state = STATE_INIT;
efx->reset_pending = RESET_TYPE_NONE;
strlcpy(efx->name, pci_name(pci_dev), sizeof(efx->name));
efx->net_dev = net_dev;
efx->rx_checksum_enabled = true;
spin_lock_init(&efx->stats_lock);
mutex_init(&efx->mac_lock);
efx->mac_op = type->default_mac_ops;
efx->phy_op = &efx_dummy_phy_operations;
efx->mdio.dev = net_dev;
INIT_WORK(&efx->mac_work, efx_mac_work);
for (i = 0; i < EFX_MAX_CHANNELS; i++) {
efx->channel[i] = efx_alloc_channel(efx, i, NULL);
if (!efx->channel[i])
goto fail;
}
efx->type = type;
EFX_BUG_ON_PARANOID(efx->type->phys_addr_channels > EFX_MAX_CHANNELS);
/* Higher numbered interrupt modes are less capable! */
efx->interrupt_mode = max(efx->type->max_interrupt_mode,
interrupt_mode);
/* Would be good to use the net_dev name, but we're too early */
snprintf(efx->workqueue_name, sizeof(efx->workqueue_name), "sfc%s",
pci_name(pci_dev));
efx->workqueue = create_singlethread_workqueue(efx->workqueue_name);
if (!efx->workqueue)
goto fail;
return 0;
fail:
efx_fini_struct(efx);
return -ENOMEM;
}
static void efx_fini_struct(struct efx_nic *efx)
{
int i;
for (i = 0; i < EFX_MAX_CHANNELS; i++)
kfree(efx->channel[i]);
if (efx->workqueue) {
destroy_workqueue(efx->workqueue);
efx->workqueue = NULL;
}
}
/**************************************************************************
*
* PCI interface
*
**************************************************************************/
/* Main body of final NIC shutdown code
* This is called only at module unload (or hotplug removal).
*/
static void efx_pci_remove_main(struct efx_nic *efx)
{
#ifdef CONFIG_RFS_ACCEL
free_irq_cpu_rmap(efx->net_dev->rx_cpu_rmap);
efx->net_dev->rx_cpu_rmap = NULL;
#endif
efx_nic_fini_interrupt(efx);
efx_fini_channels(efx);
efx_fini_port(efx);
efx->type->fini(efx);
efx_fini_napi(efx);
efx_remove_all(efx);
}
/* Final NIC shutdown
* This is called only at module unload (or hotplug removal).
*/
static void efx_pci_remove(struct pci_dev *pci_dev)
{
struct efx_nic *efx;
efx = pci_get_drvdata(pci_dev);
if (!efx)
return;
/* Mark the NIC as fini, then stop the interface */
rtnl_lock();
efx->state = STATE_FINI;
dev_close(efx->net_dev);
/* Allow any queued efx_resets() to complete */
rtnl_unlock();
efx_unregister_netdev(efx);
efx_mtd_remove(efx);
/* Wait for any scheduled resets to complete. No more will be
* scheduled from this point because efx_stop_all() has been
* called, we are no longer registered with driverlink, and
* the net_device's have been removed. */
cancel_work_sync(&efx->reset_work);
efx_pci_remove_main(efx);
efx_fini_io(efx);
netif_dbg(efx, drv, efx->net_dev, "shutdown successful\n");
pci_set_drvdata(pci_dev, NULL);
efx_fini_struct(efx);
free_netdev(efx->net_dev);
};
/* Main body of NIC initialisation
* This is called at module load (or hotplug insertion, theoretically).
*/
static int efx_pci_probe_main(struct efx_nic *efx)
{
int rc;
/* Do start-of-day initialisation */
rc = efx_probe_all(efx);
if (rc)
goto fail1;
efx_init_napi(efx);
rc = efx->type->init(efx);
if (rc) {
netif_err(efx, probe, efx->net_dev,
"failed to initialise NIC\n");
goto fail3;
}
rc = efx_init_port(efx);
if (rc) {
netif_err(efx, probe, efx->net_dev,
"failed to initialise port\n");
goto fail4;
}
efx_init_channels(efx);
rc = efx_nic_init_interrupt(efx);
if (rc)
goto fail5;
return 0;
fail5:
efx_fini_channels(efx);
efx_fini_port(efx);
fail4:
efx->type->fini(efx);
fail3:
efx_fini_napi(efx);
efx_remove_all(efx);
fail1:
return rc;
}
/* NIC initialisation
*
* This is called at module load (or hotplug insertion,
* theoretically). It sets up PCI mappings, tests and resets the NIC,
* sets up and registers the network devices with the kernel and hooks
* the interrupt service routine. It does not prepare the device for
* transmission; this is left to the first time one of the network
* interfaces is brought up (i.e. efx_net_open).
*/
static int __devinit efx_pci_probe(struct pci_dev *pci_dev,
const struct pci_device_id *entry)
{
struct efx_nic_type *type = (struct efx_nic_type *) entry->driver_data;
struct net_device *net_dev;
struct efx_nic *efx;
int i, rc;
/* Allocate and initialise a struct net_device and struct efx_nic */
net_dev = alloc_etherdev_mqs(sizeof(*efx), EFX_MAX_CORE_TX_QUEUES,
EFX_MAX_RX_QUEUES);
if (!net_dev)
return -ENOMEM;
net_dev->features |= (type->offload_features | NETIF_F_SG |
NETIF_F_HIGHDMA | NETIF_F_TSO |
NETIF_F_GRO);
if (type->offload_features & NETIF_F_V6_CSUM)
net_dev->features |= NETIF_F_TSO6;
/* Mask for features that also apply to VLAN devices */
net_dev->vlan_features |= (NETIF_F_ALL_CSUM | NETIF_F_SG |
NETIF_F_HIGHDMA | NETIF_F_TSO);
efx = netdev_priv(net_dev);
pci_set_drvdata(pci_dev, efx);
SET_NETDEV_DEV(net_dev, &pci_dev->dev);
rc = efx_init_struct(efx, type, pci_dev, net_dev);
if (rc)
goto fail1;
netif_info(efx, probe, efx->net_dev,
"Solarflare Communications NIC detected\n");
/* Set up basic I/O (BAR mappings etc) */
rc = efx_init_io(efx);
if (rc)
goto fail2;
/* No serialisation is required with the reset path because
* we're in STATE_INIT. */
for (i = 0; i < 5; i++) {
rc = efx_pci_probe_main(efx);
/* Serialise against efx_reset(). No more resets will be
* scheduled since efx_stop_all() has been called, and we
* have not and never have been registered with either
* the rtnetlink or driverlink layers. */
cancel_work_sync(&efx->reset_work);
if (rc == 0) {
if (efx->reset_pending != RESET_TYPE_NONE) {
/* If there was a scheduled reset during
* probe, the NIC is probably hosed anyway */
efx_pci_remove_main(efx);
rc = -EIO;
} else {
break;
}
}
/* Retry if a recoverably reset event has been scheduled */
if ((efx->reset_pending != RESET_TYPE_INVISIBLE) &&
(efx->reset_pending != RESET_TYPE_ALL))
goto fail3;
efx->reset_pending = RESET_TYPE_NONE;
}
if (rc) {
netif_err(efx, probe, efx->net_dev, "Could not reset NIC\n");
goto fail4;
}
/* Switch to the running state before we expose the device to the OS,
* so that dev_open()|efx_start_all() will actually start the device */
efx->state = STATE_RUNNING;
rc = efx_register_netdev(efx);
if (rc)
goto fail5;
netif_dbg(efx, probe, efx->net_dev, "initialisation successful\n");
rtnl_lock();
efx_mtd_probe(efx); /* allowed to fail */
rtnl_unlock();
return 0;
fail5:
efx_pci_remove_main(efx);
fail4:
fail3:
efx_fini_io(efx);
fail2:
efx_fini_struct(efx);
fail1:
WARN_ON(rc > 0);
netif_dbg(efx, drv, efx->net_dev, "initialisation failed. rc=%d\n", rc);
free_netdev(net_dev);
return rc;
}
static int efx_pm_freeze(struct device *dev)
{
struct efx_nic *efx = pci_get_drvdata(to_pci_dev(dev));
efx->state = STATE_FINI;
netif_device_detach(efx->net_dev);
efx_stop_all(efx);
efx_fini_channels(efx);
return 0;
}
static int efx_pm_thaw(struct device *dev)
{
struct efx_nic *efx = pci_get_drvdata(to_pci_dev(dev));
efx->state = STATE_INIT;
efx_init_channels(efx);
mutex_lock(&efx->mac_lock);
efx->phy_op->reconfigure(efx);
mutex_unlock(&efx->mac_lock);
efx_start_all(efx);
netif_device_attach(efx->net_dev);
efx->state = STATE_RUNNING;
efx->type->resume_wol(efx);
/* Reschedule any quenched resets scheduled during efx_pm_freeze() */
queue_work(reset_workqueue, &efx->reset_work);
return 0;
}
static int efx_pm_poweroff(struct device *dev)
{
struct pci_dev *pci_dev = to_pci_dev(dev);
struct efx_nic *efx = pci_get_drvdata(pci_dev);
efx->type->fini(efx);
efx->reset_pending = RESET_TYPE_NONE;
pci_save_state(pci_dev);
return pci_set_power_state(pci_dev, PCI_D3hot);
}
/* Used for both resume and restore */
static int efx_pm_resume(struct device *dev)
{
struct pci_dev *pci_dev = to_pci_dev(dev);
struct efx_nic *efx = pci_get_drvdata(pci_dev);
int rc;
rc = pci_set_power_state(pci_dev, PCI_D0);
if (rc)
return rc;
pci_restore_state(pci_dev);
rc = pci_enable_device(pci_dev);
if (rc)
return rc;
pci_set_master(efx->pci_dev);
rc = efx->type->reset(efx, RESET_TYPE_ALL);
if (rc)
return rc;
rc = efx->type->init(efx);
if (rc)
return rc;
efx_pm_thaw(dev);
return 0;
}
static int efx_pm_suspend(struct device *dev)
{
int rc;
efx_pm_freeze(dev);
rc = efx_pm_poweroff(dev);
if (rc)
efx_pm_resume(dev);
return rc;
}
static struct dev_pm_ops efx_pm_ops = {
.suspend = efx_pm_suspend,
.resume = efx_pm_resume,
.freeze = efx_pm_freeze,
.thaw = efx_pm_thaw,
.poweroff = efx_pm_poweroff,
.restore = efx_pm_resume,
};
static struct pci_driver efx_pci_driver = {
.name = KBUILD_MODNAME,
.id_table = efx_pci_table,
.probe = efx_pci_probe,
.remove = efx_pci_remove,
.driver.pm = &efx_pm_ops,
};
/**************************************************************************
*
* Kernel module interface
*
*************************************************************************/
module_param(interrupt_mode, uint, 0444);
MODULE_PARM_DESC(interrupt_mode,
"Interrupt mode (0=>MSIX 1=>MSI 2=>legacy)");
static int __init efx_init_module(void)
{
int rc;
printk(KERN_INFO "Solarflare NET driver v" EFX_DRIVER_VERSION "\n");
rc = register_netdevice_notifier(&efx_netdev_notifier);
if (rc)
goto err_notifier;
reset_workqueue = create_singlethread_workqueue("sfc_reset");
if (!reset_workqueue) {
rc = -ENOMEM;
goto err_reset;
}
rc = pci_register_driver(&efx_pci_driver);
if (rc < 0)
goto err_pci;
return 0;
err_pci:
destroy_workqueue(reset_workqueue);
err_reset:
unregister_netdevice_notifier(&efx_netdev_notifier);
err_notifier:
return rc;
}
static void __exit efx_exit_module(void)
{
printk(KERN_INFO "Solarflare NET driver unloading\n");
pci_unregister_driver(&efx_pci_driver);
destroy_workqueue(reset_workqueue);
unregister_netdevice_notifier(&efx_netdev_notifier);
}
module_init(efx_init_module);
module_exit(efx_exit_module);
MODULE_AUTHOR("Solarflare Communications and "
"Michael Brown <mbrown@fensystems.co.uk>");
MODULE_DESCRIPTION("Solarflare Communications network driver");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, efx_pci_table);
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