efx.c 71.2 KB
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/****************************************************************************
 * Driver for Solarflare Solarstorm network controllers and boards
 * Copyright 2005-2006 Fen Systems Ltd.
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 * Copyright 2005-2011 Solarflare Communications Inc.
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 *
 * 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>
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#include <linux/topology.h>
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#include <linux/gfp.h>
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#include <linux/cpu_rmap.h>
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#include "net_driver.h"
#include "efx.h"
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#include "nic.h"
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#include "mcdi.h"
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#include "workarounds.h"
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/**************************************************************************
 *
 * 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",
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	[LOOPBACK_DATA]		= "DATAPATH",
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	[LOOPBACK_GMAC]		= "GMAC",
	[LOOPBACK_XGMII]	= "XGMII",
	[LOOPBACK_XGXS]		= "XGXS",
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	[LOOPBACK_XAUI]		= "XAUI",
	[LOOPBACK_GMII]		= "GMII",
	[LOOPBACK_SGMII]	= "SGMII",
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	[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",
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	[LOOPBACK_GPHY]		= "GPHY",
	[LOOPBACK_PHYXS]	= "PHYXS",
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	[LOOPBACK_PCS]		= "PCS",
	[LOOPBACK_PMAPMD]	= "PMA/PMD",
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	[LOOPBACK_XPORT]	= "XPORT",
	[LOOPBACK_XGMII_WS]	= "XGMII_WS",
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	[LOOPBACK_XAUI_WS]	= "XAUI_WS",
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	[LOOPBACK_XAUI_WS_FAR]  = "XAUI_WS_FAR",
	[LOOPBACK_XAUI_WS_NEAR] = "XAUI_WS_NEAR",
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	[LOOPBACK_GMII_WS]	= "GMII_WS",
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	[LOOPBACK_XFI_WS]	= "XFI_WS",
	[LOOPBACK_XFI_WS_FAR]	= "XFI_WS_FAR",
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	[LOOPBACK_PHYXS_WS]	= "PHYXS_WS",
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};

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",
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	[RESET_TYPE_MC_FAILURE]    = "MC_FAILURE",
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};

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#define EFX_MAX_MTU (9 * 1024)

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/* 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;

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/**************************************************************************
 *
 * Configurable values
 *
 *************************************************************************/

/*
 * Use separate channels for TX and RX events
 *
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 * Set this to 1 to use separate channels for TX and RX. It allows us
 * to control interrupt affinity separately for TX and RX.
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 *
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 * This is only used in MSI-X interrupt mode
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 */
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static unsigned int separate_tx_channels;
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module_param(separate_tx_channels, uint, 0444);
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MODULE_PARM_DESC(separate_tx_channels,
		 "Use separate channels for TX and RX");
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/* 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
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 * monitor.  On Falcon-based NICs, this will:
 * - Check the on-board hardware monitor;
 * - Poll the link state and reconfigure the hardware as necessary.
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 */
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static unsigned int efx_monitor_interval = 1 * HZ;
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/* 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");

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static int phy_flash_cfg;
module_param(phy_flash_cfg, int, 0644);
MODULE_PARM_DESC(phy_flash_cfg, "Set PHYs into reflash mode initially");

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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");

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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");

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/**************************************************************************
 *
 * Utility functions and prototypes
 *
 *************************************************************************/
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static void efx_remove_channels(struct efx_nic *efx);
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static void efx_remove_port(struct efx_nic *efx);
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static void efx_init_napi(struct efx_nic *efx);
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static void efx_fini_napi(struct efx_nic *efx);
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static void efx_fini_napi_channel(struct efx_channel *channel);
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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);
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#define EFX_ASSERT_RESET_SERIALISED(efx)		\
	do {						\
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		if ((efx->state == STATE_RUNNING) ||	\
		    (efx->state == STATE_DISABLED))	\
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			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.
 */
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static int efx_process_channel(struct efx_channel *channel, int budget)
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{
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	struct efx_nic *efx = channel->efx;
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	int spent;
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	if (unlikely(efx->reset_pending || !channel->enabled))
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		return 0;
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	spent = efx_nic_process_eventq(channel, budget);
	if (spent == 0)
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		return 0;
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	/* 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);

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	efx_fast_push_rx_descriptors(efx_channel_get_rx_queue(channel));
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	return spent;
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}

/* 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)
{
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	/* 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. */
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	channel->work_pending = false;
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	smp_wmb();

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	efx_nic_eventq_read_ack(channel);
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}

/* 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);
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	struct efx_nic *efx = channel->efx;
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	int spent;
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	netif_vdbg(efx, intr, efx->net_dev,
		   "channel %d NAPI poll executing on CPU %d\n",
		   channel->channel, raw_smp_processor_id());
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	spent = efx_process_channel(channel, budget);
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	if (spent < budget) {
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		if (channel->channel < efx->n_rx_channels &&
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		    efx->irq_rx_adaptive &&
		    unlikely(++channel->irq_count == 1000)) {
			if (unlikely(channel->irq_mod_score <
				     irq_adapt_low_thresh)) {
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				if (channel->irq_moderation > 1) {
					channel->irq_moderation -= 1;
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					efx->type->push_irq_moderation(channel);
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				}
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			} else if (unlikely(channel->irq_mod_score >
					    irq_adapt_high_thresh)) {
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				if (channel->irq_moderation <
				    efx->irq_rx_moderation) {
					channel->irq_moderation += 1;
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					efx->type->push_irq_moderation(channel);
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				}
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			}
			channel->irq_count = 0;
			channel->irq_mod_score = 0;
		}

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		efx_filter_rfs_expire(channel);

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		/* There is no race here; although napi_disable() will
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		 * only wait for napi_complete(), this isn't a problem
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		 * since efx_channel_processed() will have no effect if
		 * interrupts have already been disabled.
		 */
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		napi_complete(napi);
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		efx_channel_processed(channel);
	}

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	return spent;
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}

/* 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.
 *
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 * 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.
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 */
void efx_process_channel_now(struct efx_channel *channel)
{
	struct efx_nic *efx = channel->efx;

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	BUG_ON(channel->channel >= efx->n_channels);
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	BUG_ON(!channel->enabled);
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	BUG_ON(!efx->loopback_selftest);
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	/* Disable interrupts and wait for ISRs to complete */
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	efx_nic_disable_interrupts(efx);
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	if (efx->legacy_irq) {
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		synchronize_irq(efx->legacy_irq);
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		efx->legacy_irq_enabled = false;
	}
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	if (channel->irq)
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		synchronize_irq(channel->irq);

	/* Wait for any NAPI processing to complete */
	napi_disable(&channel->napi_str);

	/* Poll the channel */
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	efx_process_channel(channel, channel->eventq_mask + 1);
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	/* Ack the eventq. This may cause an interrupt to be generated
	 * when they are reenabled */
	efx_channel_processed(channel);

	napi_enable(&channel->napi_str);
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	if (efx->legacy_irq)
		efx->legacy_irq_enabled = true;
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	efx_nic_enable_interrupts(efx);
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}

/* 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)
{
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	struct efx_nic *efx = channel->efx;
	unsigned long entries;

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	netif_dbg(channel->efx, probe, channel->efx->net_dev,
		  "chan %d create event queue\n", channel->channel);
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	/* 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;

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	return efx_nic_probe_eventq(channel);
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}

/* Prepare channel's event queue */
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static void efx_init_eventq(struct efx_channel *channel)
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{
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	netif_dbg(channel->efx, drv, channel->efx->net_dev,
		  "chan %d init event queue\n", channel->channel);
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	channel->eventq_read_ptr = 0;

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	efx_nic_init_eventq(channel);
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}

static void efx_fini_eventq(struct efx_channel *channel)
{
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	netif_dbg(channel->efx, drv, channel->efx->net_dev,
		  "chan %d fini event queue\n", channel->channel);
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	efx_nic_fini_eventq(channel);
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}

static void efx_remove_eventq(struct efx_channel *channel)
{
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	netif_dbg(channel->efx, drv, channel->efx->net_dev,
		  "chan %d remove event queue\n", channel->channel);
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	efx_nic_remove_eventq(channel);
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}

/**************************************************************************
 *
 * Channel handling
 *
 *************************************************************************/

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/* 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;

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		channel->napi_dev = NULL;
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		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;
}

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static int efx_probe_channel(struct efx_channel *channel)
{
	struct efx_tx_queue *tx_queue;
	struct efx_rx_queue *rx_queue;
	int rc;

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	netif_dbg(channel->efx, probe, channel->efx->net_dev,
		  "creating channel %d\n", channel->channel);
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	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;
}


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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;
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		if (efx->n_channels > efx->n_rx_channels) {
			if (channel->channel < efx->n_rx_channels) {
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				type = "-rx";
			} else {
				type = "-tx";
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				number -= efx->n_rx_channels;
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			}
		}
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		snprintf(efx->channel_name[channel->channel],
			 sizeof(efx->channel_name[0]),
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			 "%s%s-%d", efx->name, type, number);
	}
}

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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;
}

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/* Channels are shutdown and reinitialised whilst the NIC is running
 * to propagate configuration changes (mtu, checksum offload), or
 * to clear hardware error conditions
 */
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static void efx_init_channels(struct efx_nic *efx)
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{
	struct efx_tx_queue *tx_queue;
	struct efx_rx_queue *rx_queue;
	struct efx_channel *channel;

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	/* 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) +
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			      efx->type->rx_buffer_hash_size +
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			      efx->type->rx_buffer_padding);
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	efx->rx_buffer_order = get_order(efx->rx_buffer_len +
					 sizeof(struct efx_rx_page_state));
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	/* Initialise the channels */
	efx_for_each_channel(channel, efx) {
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		netif_dbg(channel->efx, drv, channel->efx->net_dev,
			  "init chan %d\n", channel->channel);
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		efx_init_eventq(channel);
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		efx_for_each_channel_tx_queue(tx_queue, channel)
			efx_init_tx_queue(tx_queue);
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		/* The rx buffer allocation strategy is MTU dependent */
		efx_rx_strategy(channel);

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		efx_for_each_channel_rx_queue(rx_queue, channel)
			efx_init_rx_queue(rx_queue);
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		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;

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	netif_dbg(channel->efx, ifup, channel->efx->net_dev,
		  "starting chan %d\n", channel->channel);
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	/* 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. */
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	channel->work_pending = false;
	channel->enabled = true;
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	smp_wmb();
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	/* Fill the queues before enabling NAPI */
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	efx_for_each_channel_rx_queue(rx_queue, channel)
		efx_fast_push_rx_descriptors(rx_queue);
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	napi_enable(&channel->napi_str);
630 631 632 633 634 635 636 637 638 639 640
}

/* 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;

641 642
	netif_dbg(channel->efx, ifdown, channel->efx->net_dev,
		  "stop chan %d\n", channel->channel);
643

644
	channel->enabled = false;
645 646 647 648 649 650 651 652
	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;
653
	int rc;
654 655 656 657

	EFX_ASSERT_RESET_SERIALISED(efx);
	BUG_ON(efx->port_enabled);

658
	rc = efx_nic_flush_queues(efx);
659 660 661 662 663
	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. */
664 665
		netif_err(efx, drv, efx->net_dev,
			  "Resetting to recover from flush failure\n");
666 667
		efx_schedule_reset(efx, RESET_TYPE_ALL);
	} else if (rc) {
668
		netif_err(efx, drv, efx->net_dev, "failed to flush queues\n");
669
	} else {
670 671
		netif_dbg(efx, drv, efx->net_dev,
			  "successfully flushed all queues\n");
672
	}
673

674
	efx_for_each_channel(channel, efx) {
675 676
		netif_dbg(channel->efx, drv, channel->efx->net_dev,
			  "shut down chan %d\n", channel->channel);
677 678 679

		efx_for_each_channel_rx_queue(rx_queue, channel)
			efx_fini_rx_queue(rx_queue);
680
		efx_for_each_possible_channel_tx_queue(tx_queue, channel)
681 682 683 684 685 686 687 688 689 690
			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;

691 692
	netif_dbg(channel->efx, drv, channel->efx->net_dev,
		  "destroy chan %d\n", channel->channel);
693 694 695

	efx_for_each_channel_rx_queue(rx_queue, channel)
		efx_remove_rx_queue(rx_queue);
696
	efx_for_each_possible_channel_tx_queue(tx_queue, channel)
697 698 699 700
		efx_remove_tx_queue(tx_queue);
	efx_remove_eventq(channel);
}

701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745
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;

746 747
	efx_init_napi(efx);

748
	/* Destroy old channels */
749 750
	for (i = 0; i < efx->n_channels; i++) {
		efx_fini_napi_channel(other_channel[i]);
751
		efx_remove_channel(other_channel[i]);
752
	}
753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773
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;
}

774
void efx_schedule_slow_fill(struct efx_rx_queue *rx_queue)
775
{
776
	mod_timer(&rx_queue->slow_fill, jiffies + msecs_to_jiffies(100));
777 778 779 780 781 782 783 784 785 786 787 788
}

/**************************************************************************
 *
 * 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.
 */
S
Steve Hodgson 已提交
789
void efx_link_status_changed(struct efx_nic *efx)
790
{
791 792
	struct efx_link_state *link_state = &efx->link_state;

793 794 795 796 797 798 799
	/* 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;

800
	if (link_state->up != netif_carrier_ok(efx->net_dev)) {
801 802
		efx->n_link_state_changes++;

803
		if (link_state->up)
804 805 806 807 808 809
			netif_carrier_on(efx->net_dev);
		else
			netif_carrier_off(efx->net_dev);
	}

	/* Status message for kernel log */
810
	if (link_state->up) {
811 812 813 814 815
		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]" : ""));
816
	} else {
817
		netif_info(efx, link, efx->net_dev, "link down\n");
818 819 820 821
	}

}

B
Ben Hutchings 已提交
822 823 824 825 826 827 828 829 830 831 832 833 834
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;
	}
}

835
void efx_link_set_wanted_fc(struct efx_nic *efx, u8 wanted_fc)
B
Ben Hutchings 已提交
836 837 838 839 840 841 842 843 844 845 846 847 848 849
{
	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;
	}
}

850 851
static void efx_fini_port(struct efx_nic *efx);

B
Ben Hutchings 已提交
852 853 854 855 856 857 858 859
/* 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)
860
{
B
Ben Hutchings 已提交
861 862
	enum efx_phy_mode phy_mode;
	int rc;
863

B
Ben Hutchings 已提交
864
	WARN_ON(!mutex_is_locked(&efx->mac_lock));
865

866 867 868 869 870 871
	/* 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);
	}

B
Ben Hutchings 已提交
872 873
	/* Disable PHY transmit in mac level loopbacks */
	phy_mode = efx->phy_mode;
874 875 876 877 878
	if (LOOPBACK_INTERNAL(efx))
		efx->phy_mode |= PHY_MODE_TX_DISABLED;
	else
		efx->phy_mode &= ~PHY_MODE_TX_DISABLED;

B
Ben Hutchings 已提交
879
	rc = efx->type->reconfigure_port(efx);
880

B
Ben Hutchings 已提交
881 882
	if (rc)
		efx->phy_mode = phy_mode;
883

B
Ben Hutchings 已提交
884
	return rc;
885 886 887 888
}

/* Reinitialise the MAC to pick up new PHY settings, even if the port is
 * disabled. */
B
Ben Hutchings 已提交
889
int efx_reconfigure_port(struct efx_nic *efx)
890
{
B
Ben Hutchings 已提交
891 892
	int rc;

893 894 895
	EFX_ASSERT_RESET_SERIALISED(efx);

	mutex_lock(&efx->mac_lock);
B
Ben Hutchings 已提交
896
	rc = __efx_reconfigure_port(efx);
897
	mutex_unlock(&efx->mac_lock);
B
Ben Hutchings 已提交
898 899

	return rc;
900 901
}

902 903 904
/* Asynchronous work item for changing MAC promiscuity and multicast
 * hash.  Avoid a drain/rx_ingress enable by reconfiguring the current
 * MAC directly. */
905 906 907 908 909
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);
910
	if (efx->port_enabled) {
911
		efx->type->push_multicast_hash(efx);
912 913
		efx->mac_op->reconfigure(efx);
	}
914 915 916
	mutex_unlock(&efx->mac_lock);
}

917 918
static int efx_probe_port(struct efx_nic *efx)
{
919
	unsigned char *perm_addr;
920 921
	int rc;

922
	netif_dbg(efx, probe, efx->net_dev, "create port\n");
923

924 925 926
	if (phy_flash_cfg)
		efx->phy_mode = PHY_MODE_SPECIAL;

927 928
	/* Connect up MAC/PHY operations table */
	rc = efx->type->probe_port(efx);
929
	if (rc)
930
		return rc;
931 932

	/* Sanity check MAC address */
933 934 935
	perm_addr = efx->net_dev->perm_addr;
	if (is_valid_ether_addr(perm_addr)) {
		memcpy(efx->net_dev->dev_addr, perm_addr, ETH_ALEN);
936
	} else {
937
		netif_err(efx, probe, efx->net_dev, "invalid MAC address %pM\n",
938
			  perm_addr);
939 940 941 942 943
		if (!allow_bad_hwaddr) {
			rc = -EINVAL;
			goto err;
		}
		random_ether_addr(efx->net_dev->dev_addr);
944 945 946
		netif_info(efx, probe, efx->net_dev,
			   "using locally-generated MAC %pM\n",
			   efx->net_dev->dev_addr);
947 948 949 950 951
	}

	return 0;

 err:
952
	efx->type->remove_port(efx);
953 954 955 956 957 958 959
	return rc;
}

static int efx_init_port(struct efx_nic *efx)
{
	int rc;

960
	netif_dbg(efx, drv, efx->net_dev, "init port\n");
961

962 963
	mutex_lock(&efx->mac_lock);

964
	rc = efx->phy_op->init(efx);
965
	if (rc)
966
		goto fail1;
967

968
	efx->port_initialized = true;
969

B
Ben Hutchings 已提交
970 971 972 973 974 975 976 977 978
	/* 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;

979
	mutex_unlock(&efx->mac_lock);
980
	return 0;
981

982
fail2:
983
	efx->phy_op->fini(efx);
984 985
fail1:
	mutex_unlock(&efx->mac_lock);
986
	return rc;
987 988 989 990
}

static void efx_start_port(struct efx_nic *efx)
{
991
	netif_dbg(efx, ifup, efx->net_dev, "start port\n");
992 993 994
	BUG_ON(efx->port_enabled);

	mutex_lock(&efx->mac_lock);
995
	efx->port_enabled = true;
996 997 998

	/* efx_mac_work() might have been scheduled after efx_stop_port(),
	 * and then cancelled by efx_flush_all() */
999
	efx->type->push_multicast_hash(efx);
1000 1001
	efx->mac_op->reconfigure(efx);

1002 1003 1004
	mutex_unlock(&efx->mac_lock);
}

S
Steve Hodgson 已提交
1005
/* Prevent efx_mac_work() and efx_monitor() from working */
1006 1007
static void efx_stop_port(struct efx_nic *efx)
{
1008
	netif_dbg(efx, ifdown, efx->net_dev, "stop port\n");
1009 1010

	mutex_lock(&efx->mac_lock);
1011
	efx->port_enabled = false;
1012 1013 1014
	mutex_unlock(&efx->mac_lock);

	/* Serialise against efx_set_multicast_list() */
1015
	if (efx_dev_registered(efx)) {
1016 1017
		netif_addr_lock_bh(efx->net_dev);
		netif_addr_unlock_bh(efx->net_dev);
1018 1019 1020 1021 1022
	}
}

static void efx_fini_port(struct efx_nic *efx)
{
1023
	netif_dbg(efx, drv, efx->net_dev, "shut down port\n");
1024 1025 1026 1027

	if (!efx->port_initialized)
		return;

1028
	efx->phy_op->fini(efx);
1029
	efx->port_initialized = false;
1030

1031
	efx->link_state.up = false;
1032 1033 1034 1035 1036
	efx_link_status_changed(efx);
}

static void efx_remove_port(struct efx_nic *efx)
{
1037
	netif_dbg(efx, drv, efx->net_dev, "destroying port\n");
1038

1039
	efx->type->remove_port(efx);
1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054
}

/**************************************************************************
 *
 * 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;
	int rc;

1055
	netif_dbg(efx, probe, efx->net_dev, "initialising I/O\n");
1056 1057 1058

	rc = pci_enable_device(pci_dev);
	if (rc) {
1059 1060
		netif_err(efx, probe, efx->net_dev,
			  "failed to enable PCI device\n");
1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077
		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) {
1078 1079
		netif_err(efx, probe, efx->net_dev,
			  "could not find a suitable DMA mask\n");
1080 1081
		goto fail2;
	}
1082 1083
	netif_dbg(efx, probe, efx->net_dev,
		  "using DMA mask %llx\n", (unsigned long long) dma_mask);
1084 1085 1086 1087 1088 1089
	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...
		 */
1090 1091
		netif_err(efx, probe, efx->net_dev,
			  "failed to set consistent DMA mask\n");
1092 1093 1094
		goto fail2;
	}

1095 1096
	efx->membase_phys = pci_resource_start(efx->pci_dev, EFX_MEM_BAR);
	rc = pci_request_region(pci_dev, EFX_MEM_BAR, "sfc");
1097
	if (rc) {
1098 1099
		netif_err(efx, probe, efx->net_dev,
			  "request for memory BAR failed\n");
1100 1101 1102
		rc = -EIO;
		goto fail3;
	}
1103 1104
	efx->membase = ioremap_nocache(efx->membase_phys,
				       efx->type->mem_map_size);
1105
	if (!efx->membase) {
1106 1107 1108 1109
		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);
1110 1111 1112
		rc = -ENOMEM;
		goto fail4;
	}
1113 1114 1115 1116
	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);
1117 1118 1119 1120

	return 0;

 fail4:
1121
	pci_release_region(efx->pci_dev, EFX_MEM_BAR);
1122
 fail3:
1123
	efx->membase_phys = 0;
1124 1125 1126 1127 1128 1129 1130 1131
 fail2:
	pci_disable_device(efx->pci_dev);
 fail1:
	return rc;
}

static void efx_fini_io(struct efx_nic *efx)
{
1132
	netif_dbg(efx, drv, efx->net_dev, "shutting down I/O\n");
1133 1134 1135 1136 1137 1138 1139

	if (efx->membase) {
		iounmap(efx->membase);
		efx->membase = NULL;
	}

	if (efx->membase_phys) {
1140
		pci_release_region(efx->pci_dev, EFX_MEM_BAR);
1141
		efx->membase_phys = 0;
1142 1143 1144 1145 1146
	}

	pci_disable_device(efx->pci_dev);
}

B
Ben Hutchings 已提交
1147 1148 1149
/* 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)
1150
{
R
Rusty Russell 已提交
1151
	cpumask_var_t core_mask;
1152 1153
	int count;
	int cpu;
1154 1155 1156

	if (rss_cpus)
		return rss_cpus;
1157

1158
	if (unlikely(!zalloc_cpumask_var(&core_mask, GFP_KERNEL))) {
R
Rusty Russell 已提交
1159
		printk(KERN_WARNING
1160
		       "sfc: RSS disabled due to allocation failure\n");
R
Rusty Russell 已提交
1161 1162 1163
		return 1;
	}

1164 1165
	count = 0;
	for_each_online_cpu(cpu) {
R
Rusty Russell 已提交
1166
		if (!cpumask_test_cpu(cpu, core_mask)) {
1167
			++count;
R
Rusty Russell 已提交
1168
			cpumask_or(core_mask, core_mask,
1169
				   topology_core_cpumask(cpu));
1170 1171 1172
		}
	}

R
Rusty Russell 已提交
1173
	free_cpumask_var(core_mask);
1174 1175 1176
	return count;
}

1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198
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;
}

1199 1200 1201
/* Probe the number and type of interrupts we are able to obtain, and
 * the resulting numbers of channels and RX queues.
 */
1202
static int efx_probe_interrupts(struct efx_nic *efx)
1203
{
1204 1205
	int max_channels =
		min_t(int, efx->type->phys_addr_channels, EFX_MAX_CHANNELS);
1206 1207 1208
	int rc, i;

	if (efx->interrupt_mode == EFX_INT_MODE_MSIX) {
1209
		struct msix_entry xentries[EFX_MAX_CHANNELS];
B
Ben Hutchings 已提交
1210
		int n_channels;
1211

B
Ben Hutchings 已提交
1212 1213 1214 1215
		n_channels = efx_wanted_channels();
		if (separate_tx_channels)
			n_channels *= 2;
		n_channels = min(n_channels, max_channels);
1216

B
Ben Hutchings 已提交
1217
		for (i = 0; i < n_channels; i++)
1218
			xentries[i].entry = i;
B
Ben Hutchings 已提交
1219
		rc = pci_enable_msix(efx->pci_dev, xentries, n_channels);
1220
		if (rc > 0) {
1221 1222 1223 1224 1225
			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");
B
Ben Hutchings 已提交
1226 1227
			EFX_BUG_ON_PARANOID(rc >= n_channels);
			n_channels = rc;
1228
			rc = pci_enable_msix(efx->pci_dev, xentries,
B
Ben Hutchings 已提交
1229
					     n_channels);
1230 1231 1232
		}

		if (rc == 0) {
B
Ben Hutchings 已提交
1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243
			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;
			}
1244 1245 1246 1247 1248
			rc = efx_init_rx_cpu_rmap(efx, xentries);
			if (rc) {
				pci_disable_msix(efx->pci_dev);
				return rc;
			}
B
Ben Hutchings 已提交
1249
			for (i = 0; i < n_channels; i++)
1250 1251
				efx_get_channel(efx, i)->irq =
					xentries[i].vector;
1252 1253 1254
		} else {
			/* Fall back to single channel MSI */
			efx->interrupt_mode = EFX_INT_MODE_MSI;
1255 1256
			netif_err(efx, drv, efx->net_dev,
				  "could not enable MSI-X\n");
1257 1258 1259 1260 1261
		}
	}

	/* Try single interrupt MSI */
	if (efx->interrupt_mode == EFX_INT_MODE_MSI) {
1262
		efx->n_channels = 1;
B
Ben Hutchings 已提交
1263 1264
		efx->n_rx_channels = 1;
		efx->n_tx_channels = 1;
1265 1266
		rc = pci_enable_msi(efx->pci_dev);
		if (rc == 0) {
1267
			efx_get_channel(efx, 0)->irq = efx->pci_dev->irq;
1268
		} else {
1269 1270
			netif_err(efx, drv, efx->net_dev,
				  "could not enable MSI\n");
1271 1272 1273 1274 1275 1276
			efx->interrupt_mode = EFX_INT_MODE_LEGACY;
		}
	}

	/* Assume legacy interrupts */
	if (efx->interrupt_mode == EFX_INT_MODE_LEGACY) {
1277
		efx->n_channels = 1 + (separate_tx_channels ? 1 : 0);
B
Ben Hutchings 已提交
1278 1279
		efx->n_rx_channels = 1;
		efx->n_tx_channels = 1;
1280 1281
		efx->legacy_irq = efx->pci_dev->irq;
	}
1282 1283

	return 0;
1284 1285 1286 1287 1288 1289 1290
}

static void efx_remove_interrupts(struct efx_nic *efx)
{
	struct efx_channel *channel;

	/* Remove MSI/MSI-X interrupts */
1291
	efx_for_each_channel(channel, efx)
1292 1293 1294 1295 1296 1297 1298 1299
		channel->irq = 0;
	pci_disable_msi(efx->pci_dev);
	pci_disable_msix(efx->pci_dev);

	/* Remove legacy interrupt */
	efx->legacy_irq = 0;
}

1300
static void efx_set_channels(struct efx_nic *efx)
1301
{
1302 1303 1304
	struct efx_channel *channel;
	struct efx_tx_queue *tx_queue;

1305
	efx->tx_channel_offset =
B
Ben Hutchings 已提交
1306
		separate_tx_channels ? efx->n_channels - efx->n_tx_channels : 0;
1307 1308 1309 1310 1311 1312 1313 1314 1315

	/* We need to adjust the TX queue numbers if we have separate
	 * RX-only and TX-only channels.
	 */
	efx_for_each_channel(channel, efx) {
		efx_for_each_channel_tx_queue(tx_queue, channel)
			tx_queue->queue -= (efx->tx_channel_offset *
					    EFX_TXQ_TYPES);
	}
1316 1317 1318 1319
}

static int efx_probe_nic(struct efx_nic *efx)
{
1320
	size_t i;
1321 1322
	int rc;

1323
	netif_dbg(efx, probe, efx->net_dev, "creating NIC\n");
1324 1325

	/* Carry out hardware-type specific initialisation */
1326
	rc = efx->type->probe(efx);
1327 1328 1329
	if (rc)
		return rc;

B
Ben Hutchings 已提交
1330
	/* Determine the number of channels and queues by trying to hook
1331
	 * in MSI-X interrupts. */
1332 1333 1334
	rc = efx_probe_interrupts(efx);
	if (rc)
		goto fail;
1335

1336 1337
	if (efx->n_channels > 1)
		get_random_bytes(&efx->rx_hash_key, sizeof(efx->rx_hash_key));
1338
	for (i = 0; i < ARRAY_SIZE(efx->rx_indir_table); i++)
1339 1340
		efx->rx_indir_table[i] =
			ethtool_rxfh_indir_default(i, efx->n_rx_channels);
1341

1342
	efx_set_channels(efx);
1343 1344
	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);
1345 1346

	/* Initialise the interrupt moderation settings */
1347 1348
	efx_init_irq_moderation(efx, tx_irq_mod_usec, rx_irq_mod_usec, true,
				true);
1349 1350

	return 0;
1351 1352 1353 1354

fail:
	efx->type->remove(efx);
	return rc;
1355 1356 1357 1358
}

static void efx_remove_nic(struct efx_nic *efx)
{
1359
	netif_dbg(efx, drv, efx->net_dev, "destroying NIC\n");
1360 1361

	efx_remove_interrupts(efx);
1362
	efx->type->remove(efx);
1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376
}

/**************************************************************************
 *
 * NIC startup/shutdown
 *
 *************************************************************************/

static int efx_probe_all(struct efx_nic *efx)
{
	int rc;

	rc = efx_probe_nic(efx);
	if (rc) {
1377
		netif_err(efx, probe, efx->net_dev, "failed to create NIC\n");
1378 1379 1380 1381 1382
		goto fail1;
	}

	rc = efx_probe_port(efx);
	if (rc) {
1383
		netif_err(efx, probe, efx->net_dev, "failed to create port\n");
1384 1385 1386
		goto fail2;
	}

1387
	efx->rxq_entries = efx->txq_entries = EFX_DEFAULT_DMAQ_SIZE;
1388 1389 1390
	rc = efx_probe_channels(efx);
	if (rc)
		goto fail3;
1391

B
Ben Hutchings 已提交
1392 1393 1394 1395 1396 1397 1398
	rc = efx_probe_filters(efx);
	if (rc) {
		netif_err(efx, probe, efx->net_dev,
			  "failed to create filter tables\n");
		goto fail4;
	}

1399 1400
	return 0;

B
Ben Hutchings 已提交
1401 1402
 fail4:
	efx_remove_channels(efx);
1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427
 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;
1428
	if (efx_dev_registered(efx) && !netif_running(efx->net_dev))
1429 1430 1431 1432 1433 1434
		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);

1435
	if (efx_dev_registered(efx) && netif_device_present(efx->net_dev))
1436 1437 1438
		netif_tx_wake_all_queues(efx->net_dev);

	efx_for_each_channel(channel, efx)
1439 1440
		efx_start_channel(channel);

1441 1442
	if (efx->legacy_irq)
		efx->legacy_irq_enabled = true;
1443
	efx_nic_enable_interrupts(efx);
1444

1445 1446 1447 1448 1449 1450
	/* 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);
1451
	if (efx->reset_pending)
1452 1453
		efx_mcdi_mode_poll(efx);

1454 1455 1456 1457
	/* 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) {
1458 1459
		queue_delayed_work(efx->workqueue, &efx->monitor_work,
				   efx_monitor_interval);
1460 1461 1462 1463 1464 1465
	} else {
		mutex_lock(&efx->mac_lock);
		if (efx->phy_op->poll(efx))
			efx_link_status_changed(efx);
		mutex_unlock(&efx->mac_lock);
	}
1466

1467
	efx->type->start_stats(efx);
1468 1469 1470 1471 1472 1473 1474 1475 1476 1477
}

/* 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 */
1478
	cancel_work_sync(&efx->mac_work);
1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495
}

/* 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;

1496
	efx->type->stop_stats(efx);
1497

1498 1499 1500
	/* Switch to MCDI polling on Siena before disabling interrupts */
	efx_mcdi_mode_poll(efx);

1501
	/* Disable interrupts and wait for ISR to complete */
1502
	efx_nic_disable_interrupts(efx);
1503
	if (efx->legacy_irq) {
1504
		synchronize_irq(efx->legacy_irq);
1505 1506
		efx->legacy_irq_enabled = false;
	}
1507
	efx_for_each_channel(channel, efx) {
1508 1509
		if (channel->irq)
			synchronize_irq(channel->irq);
1510
	}
1511 1512 1513 1514 1515 1516 1517 1518 1519 1520

	/* 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);

S
Steve Hodgson 已提交
1521
	/* Flush efx_mac_work(), refill_workqueue, monitor_work */
1522 1523 1524 1525
	efx_flush_all(efx);

	/* Stop the kernel transmit interface late, so the watchdog
	 * timer isn't ticking over the flush */
1526
	if (efx_dev_registered(efx)) {
1527
		netif_tx_stop_all_queues(efx->net_dev);
1528 1529 1530 1531 1532 1533 1534
		netif_tx_lock_bh(efx->net_dev);
		netif_tx_unlock_bh(efx->net_dev);
	}
}

static void efx_remove_all(struct efx_nic *efx)
{
B
Ben Hutchings 已提交
1535
	efx_remove_filters(efx);
1536
	efx_remove_channels(efx);
1537 1538 1539 1540 1541 1542 1543 1544 1545 1546
	efx_remove_port(efx);
	efx_remove_nic(efx);
}

/**************************************************************************
 *
 * Interrupt moderation
 *
 **************************************************************************/

1547
static unsigned int irq_mod_ticks(unsigned int usecs, unsigned int resolution)
1548
{
1549 1550
	if (usecs == 0)
		return 0;
1551 1552 1553 1554 1555
	if (usecs < resolution)
		return 1; /* never round down to 0 */
	return usecs / resolution;
}

1556
/* Set interrupt moderation parameters */
1557 1558 1559
int efx_init_irq_moderation(struct efx_nic *efx, unsigned int tx_usecs,
			    unsigned int rx_usecs, bool rx_adaptive,
			    bool rx_may_override_tx)
1560
{
1561
	struct efx_channel *channel;
1562 1563
	unsigned tx_ticks = irq_mod_ticks(tx_usecs, EFX_IRQ_MOD_RESOLUTION);
	unsigned rx_ticks = irq_mod_ticks(rx_usecs, EFX_IRQ_MOD_RESOLUTION);
1564 1565 1566

	EFX_ASSERT_RESET_SERIALISED(efx);

1567 1568 1569 1570 1571 1572 1573 1574 1575 1576
	if (tx_ticks > EFX_IRQ_MOD_MAX || rx_ticks > EFX_IRQ_MOD_MAX)
		return -EINVAL;

	if (tx_ticks != rx_ticks && efx->tx_channel_offset == 0 &&
	    !rx_may_override_tx) {
		netif_err(efx, drv, efx->net_dev, "Channels are shared. "
			  "RX and TX IRQ moderation must be equal\n");
		return -EINVAL;
	}

1577
	efx->irq_rx_adaptive = rx_adaptive;
1578
	efx->irq_rx_moderation = rx_ticks;
1579
	efx_for_each_channel(channel, efx) {
1580
		if (efx_channel_has_rx_queue(channel))
1581
			channel->irq_moderation = rx_ticks;
1582
		else if (efx_channel_has_tx_queues(channel))
1583 1584
			channel->irq_moderation = tx_ticks;
	}
1585 1586

	return 0;
1587 1588
}

1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606
void efx_get_irq_moderation(struct efx_nic *efx, unsigned int *tx_usecs,
			    unsigned int *rx_usecs, bool *rx_adaptive)
{
	*rx_adaptive = efx->irq_rx_adaptive;
	*rx_usecs = efx->irq_rx_moderation * EFX_IRQ_MOD_RESOLUTION;

	/* If channels are shared between RX and TX, so is IRQ
	 * moderation.  Otherwise, IRQ moderation is the same for all
	 * TX channels and is not adaptive.
	 */
	if (efx->tx_channel_offset == 0)
		*tx_usecs = *rx_usecs;
	else
		*tx_usecs =
			efx->channel[efx->tx_channel_offset]->irq_moderation *
			EFX_IRQ_MOD_RESOLUTION;
}

1607 1608 1609 1610 1611 1612
/**************************************************************************
 *
 * Hardware monitor
 *
 **************************************************************************/

1613
/* Run periodically off the general workqueue */
1614 1615 1616 1617 1618
static void efx_monitor(struct work_struct *data)
{
	struct efx_nic *efx = container_of(data, struct efx_nic,
					   monitor_work.work);

1619 1620 1621
	netif_vdbg(efx, timer, efx->net_dev,
		   "hardware monitor executing on CPU %d\n",
		   raw_smp_processor_id());
1622
	BUG_ON(efx->type->monitor == NULL);
1623 1624 1625

	/* If the mac_lock is already held then it is likely a port
	 * reconfiguration is already in place, which will likely do
1626 1627 1628 1629 1630 1631
	 * 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);
	}
1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647

	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)
{
1648
	struct efx_nic *efx = netdev_priv(net_dev);
1649
	struct mii_ioctl_data *data = if_mii(ifr);
1650 1651 1652

	EFX_ASSERT_RESET_SERIALISED(efx);

1653 1654 1655 1656 1657 1658
	/* 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);
1659 1660 1661 1662 1663 1664 1665 1666
}

/**************************************************************************
 *
 * NAPI interface
 *
 **************************************************************************/

1667
static void efx_init_napi(struct efx_nic *efx)
1668 1669 1670 1671 1672
{
	struct efx_channel *channel;

	efx_for_each_channel(channel, efx) {
		channel->napi_dev = efx->net_dev;
1673 1674
		netif_napi_add(channel->napi_dev, &channel->napi_str,
			       efx_poll, napi_weight);
1675
	}
1676 1677 1678 1679 1680 1681 1682
}

static void efx_fini_napi_channel(struct efx_channel *channel)
{
	if (channel->napi_dev)
		netif_napi_del(&channel->napi_str);
	channel->napi_dev = NULL;
1683 1684 1685 1686 1687 1688
}

static void efx_fini_napi(struct efx_nic *efx)
{
	struct efx_channel *channel;

1689 1690
	efx_for_each_channel(channel, efx)
		efx_fini_napi_channel(channel);
1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706
}

/**************************************************************************
 *
 * 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)
{
1707
	struct efx_nic *efx = netdev_priv(net_dev);
1708 1709
	struct efx_channel *channel;

1710
	efx_for_each_channel(channel, efx)
1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724
		efx_schedule_channel(channel);
}

#endif

/**************************************************************************
 *
 * Kernel net device interface
 *
 *************************************************************************/

/* Context: process, rtnl_lock() held. */
static int efx_net_open(struct net_device *net_dev)
{
1725
	struct efx_nic *efx = netdev_priv(net_dev);
1726 1727
	EFX_ASSERT_RESET_SERIALISED(efx);

1728 1729
	netif_dbg(efx, ifup, efx->net_dev, "opening device on CPU %d\n",
		  raw_smp_processor_id());
1730

1731 1732
	if (efx->state == STATE_DISABLED)
		return -EIO;
1733 1734
	if (efx->phy_mode & PHY_MODE_SPECIAL)
		return -EBUSY;
1735 1736
	if (efx_mcdi_poll_reboot(efx) && efx_reset(efx, RESET_TYPE_ALL))
		return -EIO;
1737

1738 1739 1740 1741
	/* Notify the kernel of the link state polled during driver load,
	 * before the monitor starts running */
	efx_link_status_changed(efx);

1742 1743 1744 1745 1746 1747 1748 1749 1750 1751
	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)
{
1752
	struct efx_nic *efx = netdev_priv(net_dev);
1753

1754 1755
	netif_dbg(efx, ifdown, efx->net_dev, "closing on CPU %d\n",
		  raw_smp_processor_id());
1756

1757 1758 1759 1760 1761 1762
	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);
	}
1763 1764 1765 1766

	return 0;
}

1767
/* Context: process, dev_base_lock or RTNL held, non-blocking. */
1768
static struct rtnl_link_stats64 *efx_net_stats(struct net_device *net_dev, struct rtnl_link_stats64 *stats)
1769
{
1770
	struct efx_nic *efx = netdev_priv(net_dev);
1771 1772
	struct efx_mac_stats *mac_stats = &efx->mac_stats;

1773
	spin_lock_bh(&efx->stats_lock);
1774
	efx->type->update_stats(efx);
1775
	spin_unlock_bh(&efx->stats_lock);
1776 1777 1778 1779 1780

	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;
1781
	stats->rx_dropped = efx->n_rx_nodesc_drop_cnt;
1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804
	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)
{
1805
	struct efx_nic *efx = netdev_priv(net_dev);
1806

1807 1808 1809
	netif_err(efx, tx_err, efx->net_dev,
		  "TX stuck with port_enabled=%d: resetting channels\n",
		  efx->port_enabled);
1810

1811
	efx_schedule_reset(efx, RESET_TYPE_TX_WATCHDOG);
1812 1813 1814 1815 1816 1817
}


/* Context: process, rtnl_lock() held. */
static int efx_change_mtu(struct net_device *net_dev, int new_mtu)
{
1818
	struct efx_nic *efx = netdev_priv(net_dev);
1819 1820 1821 1822 1823 1824 1825 1826 1827
	int rc = 0;

	EFX_ASSERT_RESET_SERIALISED(efx);

	if (new_mtu > EFX_MAX_MTU)
		return -EINVAL;

	efx_stop_all(efx);

1828
	netif_dbg(efx, drv, efx->net_dev, "changing MTU to %d\n", new_mtu);
1829 1830

	efx_fini_channels(efx);
B
Ben Hutchings 已提交
1831 1832 1833 1834

	mutex_lock(&efx->mac_lock);
	/* Reconfigure the MAC before enabling the dma queues so that
	 * the RX buffers don't overflow */
1835
	net_dev->mtu = new_mtu;
B
Ben Hutchings 已提交
1836 1837 1838
	efx->mac_op->reconfigure(efx);
	mutex_unlock(&efx->mac_lock);

1839
	efx_init_channels(efx);
1840 1841 1842 1843 1844 1845 1846

	efx_start_all(efx);
	return rc;
}

static int efx_set_mac_address(struct net_device *net_dev, void *data)
{
1847
	struct efx_nic *efx = netdev_priv(net_dev);
1848 1849 1850 1851 1852 1853
	struct sockaddr *addr = data;
	char *new_addr = addr->sa_data;

	EFX_ASSERT_RESET_SERIALISED(efx);

	if (!is_valid_ether_addr(new_addr)) {
1854 1855 1856
		netif_err(efx, drv, efx->net_dev,
			  "invalid ethernet MAC address requested: %pM\n",
			  new_addr);
1857 1858 1859 1860 1861 1862
		return -EINVAL;
	}

	memcpy(net_dev->dev_addr, new_addr, net_dev->addr_len);

	/* Reconfigure the MAC */
B
Ben Hutchings 已提交
1863 1864 1865
	mutex_lock(&efx->mac_lock);
	efx->mac_op->reconfigure(efx);
	mutex_unlock(&efx->mac_lock);
1866 1867 1868 1869

	return 0;
}

1870
/* Context: netif_addr_lock held, BHs disabled. */
1871 1872
static void efx_set_multicast_list(struct net_device *net_dev)
{
1873
	struct efx_nic *efx = netdev_priv(net_dev);
1874
	struct netdev_hw_addr *ha;
1875 1876 1877 1878
	union efx_multicast_hash *mc_hash = &efx->multicast_hash;
	u32 crc;
	int bit;

1879
	efx->promiscuous = !!(net_dev->flags & IFF_PROMISC);
1880 1881

	/* Build multicast hash table */
1882
	if (efx->promiscuous || (net_dev->flags & IFF_ALLMULTI)) {
1883 1884 1885
		memset(mc_hash, 0xff, sizeof(*mc_hash));
	} else {
		memset(mc_hash, 0x00, sizeof(*mc_hash));
1886 1887
		netdev_for_each_mc_addr(ha, net_dev) {
			crc = ether_crc_le(ETH_ALEN, ha->addr);
1888 1889 1890 1891
			bit = crc & (EFX_MCAST_HASH_ENTRIES - 1);
			set_bit_le(bit, mc_hash->byte);
		}

1892 1893 1894 1895 1896 1897
		/* 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);
	}
1898

1899 1900 1901
	if (efx->port_enabled)
		queue_work(efx->workqueue, &efx->mac_work);
	/* Otherwise efx_start_port() will do this */
1902 1903
}

1904
static int efx_set_features(struct net_device *net_dev, netdev_features_t data)
1905 1906 1907 1908 1909 1910 1911 1912 1913 1914
{
	struct efx_nic *efx = netdev_priv(net_dev);

	/* If disabling RX n-tuple filtering, clear existing filters */
	if (net_dev->features & ~data & NETIF_F_NTUPLE)
		efx_filter_clear_rx(efx, EFX_FILTER_PRI_MANUAL);

	return 0;
}

S
Stephen Hemminger 已提交
1915 1916 1917
static const struct net_device_ops efx_netdev_ops = {
	.ndo_open		= efx_net_open,
	.ndo_stop		= efx_net_stop,
1918
	.ndo_get_stats64	= efx_net_stats,
S
Stephen Hemminger 已提交
1919 1920 1921 1922 1923 1924
	.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,
1925
	.ndo_set_rx_mode	= efx_set_multicast_list,
1926
	.ndo_set_features	= efx_set_features,
S
Stephen Hemminger 已提交
1927 1928 1929
#ifdef CONFIG_NET_POLL_CONTROLLER
	.ndo_poll_controller = efx_netpoll,
#endif
1930
	.ndo_setup_tc		= efx_setup_tc,
1931 1932 1933
#ifdef CONFIG_RFS_ACCEL
	.ndo_rx_flow_steer	= efx_filter_rfs,
#endif
S
Stephen Hemminger 已提交
1934 1935
};

1936 1937 1938 1939 1940 1941 1942
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);
}

1943 1944 1945
static int efx_netdev_event(struct notifier_block *this,
			    unsigned long event, void *ptr)
{
1946
	struct net_device *net_dev = ptr;
1947

1948 1949 1950
	if (net_dev->netdev_ops == &efx_netdev_ops &&
	    event == NETDEV_CHANGENAME)
		efx_update_name(netdev_priv(net_dev));
1951 1952 1953 1954 1955 1956 1957 1958

	return NOTIFY_DONE;
}

static struct notifier_block efx_netdev_notifier = {
	.notifier_call = efx_netdev_event,
};

B
Ben Hutchings 已提交
1959 1960 1961 1962 1963 1964 1965 1966
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);

1967 1968 1969
static int efx_register_netdev(struct efx_nic *efx)
{
	struct net_device *net_dev = efx->net_dev;
1970
	struct efx_channel *channel;
1971 1972 1973 1974
	int rc;

	net_dev->watchdog_timeo = 5 * HZ;
	net_dev->irq = efx->pci_dev->irq;
S
Stephen Hemminger 已提交
1975
	net_dev->netdev_ops = &efx_netdev_ops;
1976 1977 1978
	SET_ETHTOOL_OPS(net_dev, &efx_ethtool_ops);

	/* Clear MAC statistics */
1979
	efx->mac_op->update_stats(efx);
1980 1981
	memset(&efx->mac_stats, 0, sizeof(efx->mac_stats));

1982
	rtnl_lock();
1983 1984 1985 1986

	rc = dev_alloc_name(net_dev, net_dev->name);
	if (rc < 0)
		goto fail_locked;
1987
	efx_update_name(efx);
1988 1989 1990 1991 1992

	rc = register_netdevice(net_dev);
	if (rc)
		goto fail_locked;

1993 1994
	efx_for_each_channel(channel, efx) {
		struct efx_tx_queue *tx_queue;
1995 1996
		efx_for_each_channel_tx_queue(tx_queue, channel)
			efx_init_tx_queue_core_txq(tx_queue);
1997 1998
	}

1999 2000 2001
	/* Always start with carrier off; PHY events will detect the link */
	netif_carrier_off(efx->net_dev);

2002
	rtnl_unlock();
2003

B
Ben Hutchings 已提交
2004 2005
	rc = device_create_file(&efx->pci_dev->dev, &dev_attr_phy_type);
	if (rc) {
2006 2007
		netif_err(efx, drv, efx->net_dev,
			  "failed to init net dev attributes\n");
B
Ben Hutchings 已提交
2008 2009 2010
		goto fail_registered;
	}

2011
	return 0;
B
Ben Hutchings 已提交
2012

2013 2014
fail_locked:
	rtnl_unlock();
2015
	netif_err(efx, drv, efx->net_dev, "could not register net dev\n");
2016 2017
	return rc;

B
Ben Hutchings 已提交
2018 2019 2020
fail_registered:
	unregister_netdev(net_dev);
	return rc;
2021 2022 2023 2024
}

static void efx_unregister_netdev(struct efx_nic *efx)
{
2025
	struct efx_channel *channel;
2026 2027 2028 2029 2030
	struct efx_tx_queue *tx_queue;

	if (!efx->net_dev)
		return;

2031
	BUG_ON(netdev_priv(efx->net_dev) != efx);
2032 2033 2034 2035

	/* 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. */
2036 2037 2038 2039
	efx_for_each_channel(channel, efx) {
		efx_for_each_channel_tx_queue(tx_queue, channel)
			efx_release_tx_buffers(tx_queue);
	}
2040

2041
	if (efx_dev_registered(efx)) {
2042
		strlcpy(efx->name, pci_name(efx->pci_dev), sizeof(efx->name));
B
Ben Hutchings 已提交
2043
		device_remove_file(&efx->pci_dev->dev, &dev_attr_phy_type);
2044 2045 2046 2047 2048 2049 2050 2051 2052 2053
		unregister_netdev(efx->net_dev);
	}
}

/**************************************************************************
 *
 * Device reset and suspend
 *
 **************************************************************************/

B
Ben Hutchings 已提交
2054 2055
/* Tears down the entire software state and most of the hardware state
 * before reset.  */
B
Ben Hutchings 已提交
2056
void efx_reset_down(struct efx_nic *efx, enum reset_type method)
2057 2058 2059
{
	EFX_ASSERT_RESET_SERIALISED(efx);

B
Ben Hutchings 已提交
2060 2061 2062
	efx_stop_all(efx);
	mutex_lock(&efx->mac_lock);

2063
	efx_fini_channels(efx);
2064 2065
	if (efx->port_initialized && method != RESET_TYPE_INVISIBLE)
		efx->phy_op->fini(efx);
2066
	efx->type->fini(efx);
2067 2068
}

B
Ben Hutchings 已提交
2069 2070 2071 2072 2073
/* 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. */
B
Ben Hutchings 已提交
2074
int efx_reset_up(struct efx_nic *efx, enum reset_type method, bool ok)
2075 2076 2077
{
	int rc;

B
Ben Hutchings 已提交
2078
	EFX_ASSERT_RESET_SERIALISED(efx);
2079

2080
	rc = efx->type->init(efx);
2081
	if (rc) {
2082
		netif_err(efx, drv, efx->net_dev, "failed to initialise NIC\n");
2083
		goto fail;
2084 2085
	}

2086 2087 2088
	if (!ok)
		goto fail;

2089
	if (efx->port_initialized && method != RESET_TYPE_INVISIBLE) {
2090 2091 2092 2093
		rc = efx->phy_op->init(efx);
		if (rc)
			goto fail;
		if (efx->phy_op->reconfigure(efx))
2094 2095
			netif_err(efx, drv, efx->net_dev,
				  "could not restore PHY settings\n");
2096 2097
	}

2098
	efx->mac_op->reconfigure(efx);
2099

2100
	efx_init_channels(efx);
B
Ben Hutchings 已提交
2101
	efx_restore_filters(efx);
2102 2103 2104 2105 2106 2107 2108 2109 2110

	mutex_unlock(&efx->mac_lock);

	efx_start_all(efx);

	return 0;

fail:
	efx->port_initialized = false;
B
Ben Hutchings 已提交
2111 2112 2113

	mutex_unlock(&efx->mac_lock);

2114 2115 2116
	return rc;
}

2117 2118
/* 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.
2119
 *
2120
 * Caller must hold the rtnl_lock.
2121
 */
2122
int efx_reset(struct efx_nic *efx, enum reset_type method)
2123
{
2124 2125
	int rc, rc2;
	bool disabled;
2126

2127 2128
	netif_info(efx, drv, efx->net_dev, "resetting (%s)\n",
		   RESET_TYPE(method));
2129

2130
	netif_device_detach(efx->net_dev);
B
Ben Hutchings 已提交
2131
	efx_reset_down(efx, method);
2132

2133
	rc = efx->type->reset(efx, method);
2134
	if (rc) {
2135
		netif_err(efx, drv, efx->net_dev, "failed to reset hardware\n");
2136
		goto out;
2137 2138
	}

2139 2140 2141 2142
	/* Clear flags for the scopes we covered.  We assume the NIC and
	 * driver are now quiescent so that there is no race here.
	 */
	efx->reset_pending &= -(1 << (method + 1));
2143 2144 2145 2146 2147 2148 2149

	/* 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);

2150
out:
2151
	/* Leave device stopped if necessary */
2152 2153 2154 2155 2156 2157
	disabled = rc || method == RESET_TYPE_DISABLE;
	rc2 = efx_reset_up(efx, method, !disabled);
	if (rc2) {
		disabled = true;
		if (!rc)
			rc = rc2;
2158 2159
	}

2160
	if (disabled) {
2161
		dev_close(efx->net_dev);
2162
		netif_err(efx, drv, efx->net_dev, "has been disabled\n");
2163 2164
		efx->state = STATE_DISABLED;
	} else {
2165
		netif_dbg(efx, drv, efx->net_dev, "reset complete\n");
2166
		netif_device_attach(efx->net_dev);
2167
	}
2168 2169 2170 2171 2172 2173 2174 2175
	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)
{
2176
	struct efx_nic *efx = container_of(data, struct efx_nic, reset_work);
2177
	unsigned long pending = ACCESS_ONCE(efx->reset_pending);
2178

2179
	if (!pending)
2180 2181
		return;

2182
	/* If we're not RUNNING then don't reset. Leave the reset_pending
2183
	 * flags set so that efx_pci_probe_main will be retried */
2184
	if (efx->state != STATE_RUNNING) {
2185 2186
		netif_info(efx, drv, efx->net_dev,
			   "scheduled reset quenched. NIC not RUNNING\n");
2187 2188 2189 2190
		return;
	}

	rtnl_lock();
2191
	(void)efx_reset(efx, fls(pending) - 1);
2192
	rtnl_unlock();
2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204
}

void efx_schedule_reset(struct efx_nic *efx, enum reset_type type)
{
	enum reset_type method;

	switch (type) {
	case RESET_TYPE_INVISIBLE:
	case RESET_TYPE_ALL:
	case RESET_TYPE_WORLD:
	case RESET_TYPE_DISABLE:
		method = type;
2205 2206
		netif_dbg(efx, drv, efx->net_dev, "scheduling %s reset\n",
			  RESET_TYPE(method));
2207 2208
		break;
	default:
2209
		method = efx->type->map_reset_reason(type);
2210 2211 2212
		netif_dbg(efx, drv, efx->net_dev,
			  "scheduling %s reset for %s\n",
			  RESET_TYPE(method), RESET_TYPE(type));
2213 2214
		break;
	}
2215

2216
	set_bit(method, &efx->reset_pending);
2217

2218 2219 2220 2221
	/* 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);

2222
	queue_work(reset_workqueue, &efx->reset_work);
2223 2224 2225 2226 2227 2228 2229 2230 2231
}

/**************************************************************************
 *
 * List of NICs we support
 *
 **************************************************************************/

/* PCI device ID table */
2232
static DEFINE_PCI_DEVICE_TABLE(efx_pci_table) = {
2233 2234
	{PCI_DEVICE(PCI_VENDOR_ID_SOLARFLARE,
		    PCI_DEVICE_ID_SOLARFLARE_SFC4000A_0),
2235
	 .driver_data = (unsigned long) &falcon_a1_nic_type},
2236 2237
	{PCI_DEVICE(PCI_VENDOR_ID_SOLARFLARE,
		    PCI_DEVICE_ID_SOLARFLARE_SFC4000B),
2238
	 .driver_data = (unsigned long) &falcon_b0_nic_type},
2239
	{PCI_DEVICE(PCI_VENDOR_ID_SOLARFLARE, 0x0803),	/* SFC9020 */
2240
	 .driver_data = (unsigned long) &siena_a0_nic_type},
2241
	{PCI_DEVICE(PCI_VENDOR_ID_SOLARFLARE, 0x0813),	/* SFL9021 */
2242
	 .driver_data = (unsigned long) &siena_a0_nic_type},
2243 2244 2245 2246 2247
	{0}			/* end of list */
};

/**************************************************************************
 *
2248
 * Dummy PHY/MAC operations
2249
 *
2250
 * Can be used for some unimplemented operations
2251 2252 2253 2254 2255 2256 2257 2258 2259
 * 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) {}
S
stephen hemminger 已提交
2260 2261

static bool efx_port_dummy_op_poll(struct efx_nic *efx)
S
Steve Hodgson 已提交
2262 2263 2264
{
	return false;
}
2265

2266
static const struct efx_phy_operations efx_dummy_phy_operations = {
2267
	.init		 = efx_port_dummy_op_int,
B
Ben Hutchings 已提交
2268
	.reconfigure	 = efx_port_dummy_op_int,
S
Steve Hodgson 已提交
2269
	.poll		 = efx_port_dummy_op_poll,
2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281
	.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).
 */
2282
static int efx_init_struct(struct efx_nic *efx, const struct efx_nic_type *type,
2283 2284
			   struct pci_dev *pci_dev, struct net_device *net_dev)
{
2285
	int i;
2286 2287 2288 2289

	/* Initialise common structures */
	memset(efx, 0, sizeof(*efx));
	spin_lock_init(&efx->biu_lock);
2290 2291 2292
#ifdef CONFIG_SFC_MTD
	INIT_LIST_HEAD(&efx->mtd_list);
#endif
2293 2294 2295
	INIT_WORK(&efx->reset_work, efx_reset_work);
	INIT_DELAYED_WORK(&efx->monitor_work, efx_monitor);
	efx->pci_dev = pci_dev;
2296
	efx->msg_enable = debug;
2297 2298 2299 2300 2301 2302
	efx->state = STATE_INIT;
	strlcpy(efx->name, pci_name(pci_dev), sizeof(efx->name));

	efx->net_dev = net_dev;
	spin_lock_init(&efx->stats_lock);
	mutex_init(&efx->mac_lock);
2303
	efx->mac_op = type->default_mac_ops;
2304
	efx->phy_op = &efx_dummy_phy_operations;
2305
	efx->mdio.dev = net_dev;
2306
	INIT_WORK(&efx->mac_work, efx_mac_work);
2307 2308

	for (i = 0; i < EFX_MAX_CHANNELS; i++) {
2309 2310 2311
		efx->channel[i] = efx_alloc_channel(efx, i, NULL);
		if (!efx->channel[i])
			goto fail;
2312 2313 2314 2315 2316 2317 2318 2319 2320 2321
	}

	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);

2322 2323 2324 2325
	/* 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);
2326
	if (!efx->workqueue)
2327
		goto fail;
2328

2329
	return 0;
2330 2331 2332 2333

fail:
	efx_fini_struct(efx);
	return -ENOMEM;
2334 2335 2336 2337
}

static void efx_fini_struct(struct efx_nic *efx)
{
2338 2339 2340 2341 2342
	int i;

	for (i = 0; i < EFX_MAX_CHANNELS; i++)
		kfree(efx->channel[i]);

2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359
	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)
{
2360 2361 2362 2363
#ifdef CONFIG_RFS_ACCEL
	free_irq_cpu_rmap(efx->net_dev->rx_cpu_rmap);
	efx->net_dev->rx_cpu_rmap = NULL;
#endif
2364
	efx_nic_fini_interrupt(efx);
2365 2366
	efx_fini_channels(efx);
	efx_fini_port(efx);
2367
	efx->type->fini(efx);
2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392
	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);

2393 2394
	efx_mtd_remove(efx);

2395 2396 2397 2398
	/* 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. */
2399
	cancel_work_sync(&efx->reset_work);
2400 2401 2402 2403

	efx_pci_remove_main(efx);

	efx_fini_io(efx);
2404
	netif_dbg(efx, drv, efx->net_dev, "shutdown successful\n");
2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422

	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;

2423
	efx_init_napi(efx);
2424

2425
	rc = efx->type->init(efx);
2426
	if (rc) {
2427 2428
		netif_err(efx, probe, efx->net_dev,
			  "failed to initialise NIC\n");
2429
		goto fail3;
2430 2431 2432 2433
	}

	rc = efx_init_port(efx);
	if (rc) {
2434 2435
		netif_err(efx, probe, efx->net_dev,
			  "failed to initialise port\n");
2436
		goto fail4;
2437 2438
	}

2439
	efx_init_channels(efx);
2440

2441
	rc = efx_nic_init_interrupt(efx);
2442
	if (rc)
2443
		goto fail5;
2444 2445 2446

	return 0;

2447
 fail5:
2448
	efx_fini_channels(efx);
2449 2450
	efx_fini_port(efx);
 fail4:
2451
	efx->type->fini(efx);
2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470
 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)
{
2471
	const struct efx_nic_type *type = (const struct efx_nic_type *) entry->driver_data;
2472 2473 2474 2475 2476
	struct net_device *net_dev;
	struct efx_nic *efx;
	int i, rc;

	/* Allocate and initialise a struct net_device and struct efx_nic */
2477 2478
	net_dev = alloc_etherdev_mqs(sizeof(*efx), EFX_MAX_CORE_TX_QUEUES,
				     EFX_MAX_RX_QUEUES);
2479 2480
	if (!net_dev)
		return -ENOMEM;
2481
	net_dev->features |= (type->offload_features | NETIF_F_SG |
B
Ben Hutchings 已提交
2482
			      NETIF_F_HIGHDMA | NETIF_F_TSO |
2483
			      NETIF_F_RXCSUM);
B
Ben Hutchings 已提交
2484 2485
	if (type->offload_features & NETIF_F_V6_CSUM)
		net_dev->features |= NETIF_F_TSO6;
2486 2487
	/* Mask for features that also apply to VLAN devices */
	net_dev->vlan_features |= (NETIF_F_ALL_CSUM | NETIF_F_SG |
2488 2489 2490 2491
				   NETIF_F_HIGHDMA | NETIF_F_ALL_TSO |
				   NETIF_F_RXCSUM);
	/* All offloads can be toggled */
	net_dev->hw_features = net_dev->features & ~NETIF_F_HIGHDMA;
2492
	efx = netdev_priv(net_dev);
2493
	pci_set_drvdata(pci_dev, efx);
2494
	SET_NETDEV_DEV(net_dev, &pci_dev->dev);
2495 2496 2497 2498
	rc = efx_init_struct(efx, type, pci_dev, net_dev);
	if (rc)
		goto fail1;

2499
	netif_info(efx, probe, efx->net_dev,
2500
		   "Solarflare NIC detected\n");
2501 2502 2503 2504 2505 2506 2507 2508 2509 2510 2511 2512 2513 2514 2515

	/* 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. */
2516
		cancel_work_sync(&efx->reset_work);
2517

2518
		if (rc == 0) {
2519
			if (efx->reset_pending) {
2520 2521 2522 2523 2524 2525 2526 2527 2528
				/* If there was a scheduled reset during
				 * probe, the NIC is probably hosed anyway */
				efx_pci_remove_main(efx);
				rc = -EIO;
			} else {
				break;
			}
		}

2529
		/* Retry if a recoverably reset event has been scheduled */
2530 2531 2532
		if (efx->reset_pending &
		    ~(1 << RESET_TYPE_INVISIBLE | 1 << RESET_TYPE_ALL) ||
		    !efx->reset_pending)
2533 2534
			goto fail3;

2535
		efx->reset_pending = 0;
2536 2537 2538
	}

	if (rc) {
2539
		netif_err(efx, probe, efx->net_dev, "Could not reset NIC\n");
2540 2541 2542
		goto fail4;
	}

2543 2544
	/* 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 */
2545
	efx->state = STATE_RUNNING;
2546

2547 2548 2549 2550
	rc = efx_register_netdev(efx);
	if (rc)
		goto fail5;

2551
	netif_dbg(efx, probe, efx->net_dev, "initialisation successful\n");
2552 2553 2554 2555

	rtnl_lock();
	efx_mtd_probe(efx); /* allowed to fail */
	rtnl_unlock();
2556 2557 2558 2559 2560 2561 2562 2563 2564 2565
	return 0;

 fail5:
	efx_pci_remove_main(efx);
 fail4:
 fail3:
	efx_fini_io(efx);
 fail2:
	efx_fini_struct(efx);
 fail1:
S
Steve Hodgson 已提交
2566
	WARN_ON(rc > 0);
2567
	netif_dbg(efx, drv, efx->net_dev, "initialisation failed. rc=%d\n", rc);
2568 2569 2570 2571
	free_netdev(net_dev);
	return rc;
}

2572 2573 2574 2575 2576 2577 2578 2579 2580 2581 2582 2583 2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603 2604 2605
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);

2606 2607 2608
	/* Reschedule any quenched resets scheduled during efx_pm_freeze() */
	queue_work(reset_workqueue, &efx->reset_work);

2609 2610 2611 2612 2613 2614 2615 2616 2617 2618
	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);

2619
	efx->reset_pending = 0;
2620 2621 2622 2623 2624 2625 2626 2627 2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638 2639 2640 2641 2642 2643 2644 2645 2646 2647 2648 2649 2650 2651 2652 2653 2654 2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 2668 2669

	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,
};

2670
static struct pci_driver efx_pci_driver = {
2671
	.name		= KBUILD_MODNAME,
2672 2673 2674
	.id_table	= efx_pci_table,
	.probe		= efx_pci_probe,
	.remove		= efx_pci_remove,
2675
	.driver.pm	= &efx_pm_ops,
2676 2677 2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697
};

/**************************************************************************
 *
 * 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;

2698 2699 2700 2701 2702
	reset_workqueue = create_singlethread_workqueue("sfc_reset");
	if (!reset_workqueue) {
		rc = -ENOMEM;
		goto err_reset;
	}
2703 2704 2705 2706 2707 2708 2709 2710

	rc = pci_register_driver(&efx_pci_driver);
	if (rc < 0)
		goto err_pci;

	return 0;

 err_pci:
2711 2712
	destroy_workqueue(reset_workqueue);
 err_reset:
2713 2714 2715 2716 2717 2718 2719 2720 2721 2722
	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);
2723
	destroy_workqueue(reset_workqueue);
2724 2725 2726 2727 2728 2729 2730
	unregister_netdevice_notifier(&efx_netdev_notifier);

}

module_init(efx_init_module);
module_exit(efx_exit_module);

2731 2732
MODULE_AUTHOR("Solarflare Communications and "
	      "Michael Brown <mbrown@fensystems.co.uk>");
2733 2734 2735
MODULE_DESCRIPTION("Solarflare Communications network driver");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, efx_pci_table);