efx.c 86.4 KB
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/****************************************************************************
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 * Driver for Solarflare network controllers and boards
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 * Copyright 2005-2006 Fen Systems Ltd.
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 * Copyright 2005-2013 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/ethtool.h>
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#include <linux/topology.h>
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#include <linux/gfp.h>
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#include <linux/aer.h>
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#include <linux/interrupt.h>
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#include "net_driver.h"
#include "efx.h"
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#include "nic.h"
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#include "selftest.h"
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#include "sriov.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;
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const char *const efx_loopback_mode_names[] = {
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	[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;
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const char *const efx_reset_type_names[] = {
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	[RESET_TYPE_INVISIBLE]          = "INVISIBLE",
	[RESET_TYPE_ALL]                = "ALL",
	[RESET_TYPE_RECOVER_OR_ALL]     = "RECOVER_OR_ALL",
	[RESET_TYPE_WORLD]              = "WORLD",
	[RESET_TYPE_RECOVER_OR_DISABLE] = "RECOVER_OR_DISABLE",
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	[RESET_TYPE_MC_BIST]		= "MC_BIST",
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	[RESET_TYPE_DISABLE]            = "DISABLE",
	[RESET_TYPE_TX_WATCHDOG]        = "TX_WATCHDOG",
	[RESET_TYPE_INT_ERROR]          = "INT_ERROR",
	[RESET_TYPE_RX_RECOVERY]        = "RX_RECOVERY",
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	[RESET_TYPE_DMA_ERROR]          = "DMA_ERROR",
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	[RESET_TYPE_TX_SKIP]            = "TX_SKIP",
	[RESET_TYPE_MC_FAILURE]         = "MC_FAILURE",
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	[RESET_TYPE_MCDI_TIMEOUT]	= "MCDI_TIMEOUT (FLR)",
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};

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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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/* How often and how many times to poll for a reset while waiting for a
 * BIST that another function started to complete.
 */
#define BIST_WAIT_DELAY_MS	100
#define BIST_WAIT_DELAY_COUNT	100

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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 bool separate_tx_channels;
module_param(separate_tx_channels, bool, 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:
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 * - Check the on-board hardware monitor;
 * - Poll the link state and reconfigure the hardware as necessary.
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 * On Siena-based NICs for power systems with EEH support, this will give EEH a
 * chance to start.
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 */
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static unsigned int efx_monitor_interval = 1 * HZ;
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/* 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.
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 * The default (0) means to assign an interrupt to each core.
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 */
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 bool phy_flash_cfg;
module_param(phy_flash_cfg, bool, 0644);
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MODULE_PARM_DESC(phy_flash_cfg, "Set PHYs into reflash mode initially");

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static unsigned irq_adapt_low_thresh = 8000;
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module_param(irq_adapt_low_thresh, uint, 0644);
MODULE_PARM_DESC(irq_adapt_low_thresh,
		 "Threshold score for reducing IRQ moderation");

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static unsigned irq_adapt_high_thresh = 16000;
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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 int efx_soft_enable_interrupts(struct efx_nic *efx);
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static void efx_soft_disable_interrupts(struct efx_nic *efx);
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static void efx_remove_channel(struct efx_channel *channel);
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static void efx_remove_channels(struct efx_nic *efx);
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static const struct efx_channel_type efx_default_channel_type;
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static void efx_remove_port(struct efx_nic *efx);
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static void efx_init_napi_channel(struct efx_channel *channel);
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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_READY) ||	\
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		    (efx->state == STATE_RECOVERY) ||	\
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		    (efx->state == STATE_DISABLED))	\
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			ASSERT_RTNL();			\
	} while (0)

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static int efx_check_disabled(struct efx_nic *efx)
{
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	if (efx->state == STATE_DISABLED || efx->state == STATE_RECOVERY) {
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		netif_err(efx, drv, efx->net_dev,
			  "device is disabled due to earlier errors\n");
		return -EIO;
	}
	return 0;
}

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/**************************************************************************
 *
 * 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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	int spent;
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	if (unlikely(!channel->enabled))
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		return 0;
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	spent = efx_nic_process_eventq(channel, budget);
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	if (spent && efx_channel_has_rx_queue(channel)) {
		struct efx_rx_queue *rx_queue =
			efx_channel_get_rx_queue(channel);

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		efx_rx_flush_packet(channel);
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		efx_fast_push_rx_descriptors(rx_queue, true);
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	}

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	return spent;
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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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	if (!efx_channel_lock_napi(channel))
		return budget;

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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 (efx_channel_has_rx_queue(channel) &&
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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_nic_eventq_read_ack() will have no effect if
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		 * interrupts have already been disabled.
		 */
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		napi_complete(napi);
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		efx_nic_eventq_read_ack(channel);
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	}

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	efx_channel_unlock_napi(channel);
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	return spent;
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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(efx, probe, efx->net_dev,
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		  "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 int efx_init_eventq(struct efx_channel *channel)
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{
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	struct efx_nic *efx = channel->efx;
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	int rc;

	EFX_WARN_ON_PARANOID(channel->eventq_init);

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	netif_dbg(efx, drv, efx->net_dev,
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		  "chan %d init event queue\n", channel->channel);
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	rc = efx_nic_init_eventq(channel);
	if (rc == 0) {
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		efx->type->push_irq_moderation(channel);
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		channel->eventq_read_ptr = 0;
		channel->eventq_init = true;
	}
	return rc;
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}

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/* Enable event queue processing and NAPI */
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void efx_start_eventq(struct efx_channel *channel)
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{
	netif_dbg(channel->efx, ifup, channel->efx->net_dev,
		  "chan %d start event queue\n", channel->channel);

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	/* Make sure the NAPI handler sees the enabled flag set */
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	channel->enabled = true;
	smp_wmb();

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	efx_channel_enable(channel);
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	napi_enable(&channel->napi_str);
	efx_nic_eventq_read_ack(channel);
}

/* Disable event queue processing and NAPI */
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void efx_stop_eventq(struct efx_channel *channel)
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{
	if (!channel->enabled)
		return;

	napi_disable(&channel->napi_str);
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	while (!efx_channel_disable(channel))
		usleep_range(1000, 20000);
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	channel->enabled = false;
}

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static void efx_fini_eventq(struct efx_channel *channel)
{
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	if (!channel->eventq_init)
		return;

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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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	channel->eventq_init = false;
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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. */
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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;

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	channel = kzalloc(sizeof(*channel), GFP_KERNEL);
	if (!channel)
		return NULL;
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	channel->efx = efx;
	channel->channel = i;
	channel->type = &efx_default_channel_type;
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	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;
	}
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	rx_queue = &channel->rx_queue;
	rx_queue->efx = efx;
	setup_timer(&rx_queue->slow_fill, efx_rx_slow_fill,
		    (unsigned long)rx_queue);
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	return channel;
}

/* Allocate and initialise a channel structure, copying parameters
 * (but not resources) from an old channel structure.
 */
static struct efx_channel *
efx_copy_channel(const struct efx_channel *old_channel)
{
	struct efx_channel *channel;
	struct efx_rx_queue *rx_queue;
	struct efx_tx_queue *tx_queue;
	int j;
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	channel = kmalloc(sizeof(*channel), GFP_KERNEL);
	if (!channel)
		return NULL;

	*channel = *old_channel;

	channel->napi_dev = NULL;
	memset(&channel->eventq, 0, sizeof(channel->eventq));
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	for (j = 0; j < EFX_TXQ_TYPES; j++) {
		tx_queue = &channel->tx_queue[j];
		if (tx_queue->channel)
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			tx_queue->channel = channel;
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		tx_queue->buffer = NULL;
		memset(&tx_queue->txd, 0, sizeof(tx_queue->txd));
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	}

	rx_queue = &channel->rx_queue;
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	rx_queue->buffer = NULL;
	memset(&rx_queue->rxd, 0, sizeof(rx_queue->rxd));
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	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 = channel->type->pre_probe(channel);
	if (rc)
		goto fail;

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	rc = efx_probe_eventq(channel);
	if (rc)
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		goto fail;
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	efx_for_each_channel_tx_queue(tx_queue, channel) {
		rc = efx_probe_tx_queue(tx_queue);
		if (rc)
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			goto fail;
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	}

	efx_for_each_channel_rx_queue(rx_queue, channel) {
		rc = efx_probe_rx_queue(rx_queue);
		if (rc)
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			goto fail;
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	}

	return 0;

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fail:
	efx_remove_channel(channel);
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	return rc;
}

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static void
efx_get_channel_name(struct efx_channel *channel, char *buf, size_t len)
{
	struct efx_nic *efx = channel->efx;
	const char *type;
	int number;

	number = channel->channel;
	if (efx->tx_channel_offset == 0) {
		type = "";
	} else if (channel->channel < efx->tx_channel_offset) {
		type = "-rx";
	} else {
		type = "-tx";
		number -= efx->tx_channel_offset;
	}
	snprintf(buf, len, "%s%s-%d", efx->name, type, number);
}
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static void efx_set_channel_names(struct efx_nic *efx)
{
	struct efx_channel *channel;

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	efx_for_each_channel(channel, efx)
		channel->type->get_name(channel,
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					efx->msi_context[channel->channel].name,
					sizeof(efx->msi_context[0].name));
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}

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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;

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	/* Probe channels in reverse, so that any 'extra' channels
	 * use the start of the buffer table. This allows the traffic
	 * channels to be resized without moving them or wasting the
	 * entries before them.
	 */
	efx_for_each_channel_rev(channel, efx) {
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		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_start_datapath(struct efx_nic *efx)
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{
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	bool old_rx_scatter = efx->rx_scatter;
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	struct efx_tx_queue *tx_queue;
	struct efx_rx_queue *rx_queue;
	struct efx_channel *channel;
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	size_t rx_buf_len;
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	/* Calculate the rx buffer allocation parameters required to
	 * support the current MTU, including padding for header
	 * alignment and overruns.
	 */
598
	efx->rx_dma_len = (efx->rx_prefix_size +
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			   EFX_MAX_FRAME_LEN(efx->net_dev->mtu) +
			   efx->type->rx_buffer_padding);
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	rx_buf_len = (sizeof(struct efx_rx_page_state) +
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		      efx->rx_ip_align + efx->rx_dma_len);
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	if (rx_buf_len <= PAGE_SIZE) {
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		efx->rx_scatter = efx->type->always_rx_scatter;
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		efx->rx_buffer_order = 0;
	} else if (efx->type->can_rx_scatter) {
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		BUILD_BUG_ON(EFX_RX_USR_BUF_SIZE % L1_CACHE_BYTES);
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		BUILD_BUG_ON(sizeof(struct efx_rx_page_state) +
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			     2 * ALIGN(NET_IP_ALIGN + EFX_RX_USR_BUF_SIZE,
				       EFX_RX_BUF_ALIGNMENT) >
			     PAGE_SIZE);
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		efx->rx_scatter = true;
		efx->rx_dma_len = EFX_RX_USR_BUF_SIZE;
		efx->rx_buffer_order = 0;
	} else {
		efx->rx_scatter = false;
		efx->rx_buffer_order = get_order(rx_buf_len);
	}

620 621 622 623 624 625 626 627 628 629 630
	efx_rx_config_page_split(efx);
	if (efx->rx_buffer_order)
		netif_dbg(efx, drv, efx->net_dev,
			  "RX buf len=%u; page order=%u batch=%u\n",
			  efx->rx_dma_len, efx->rx_buffer_order,
			  efx->rx_pages_per_batch);
	else
		netif_dbg(efx, drv, efx->net_dev,
			  "RX buf len=%u step=%u bpp=%u; page batch=%u\n",
			  efx->rx_dma_len, efx->rx_page_buf_step,
			  efx->rx_bufs_per_page, efx->rx_pages_per_batch);
631

J
Jon Cooper 已提交
632
	/* RX filters may also have scatter-enabled flags */
633
	if (efx->rx_scatter != old_rx_scatter)
634
		efx->type->filter_update_rx_scatter(efx);
635

636 637 638 639 640 641 642 643 644 645
	/* We must keep at least one descriptor in a TX ring empty.
	 * We could avoid this when the queue size does not exactly
	 * match the hardware ring size, but it's not that important.
	 * Therefore we stop the queue when one more skb might fill
	 * the ring completely.  We wake it when half way back to
	 * empty.
	 */
	efx->txq_stop_thresh = efx->txq_entries - efx_tx_max_skb_descs(efx);
	efx->txq_wake_thresh = efx->txq_stop_thresh / 2;

646 647
	/* Initialise the channels */
	efx_for_each_channel(channel, efx) {
648
		efx_for_each_channel_tx_queue(tx_queue, channel) {
649
			efx_init_tx_queue(tx_queue);
650 651
			atomic_inc(&efx->active_queues);
		}
652

653
		efx_for_each_channel_rx_queue(rx_queue, channel) {
654
			efx_init_rx_queue(rx_queue);
655
			atomic_inc(&efx->active_queues);
656 657 658
			efx_stop_eventq(channel);
			efx_fast_push_rx_descriptors(rx_queue, false);
			efx_start_eventq(channel);
659
		}
660

661
		WARN_ON(channel->rx_pkt_n_frags);
662 663
	}

664 665
	efx_ptp_start_datapath(efx);

666 667
	if (netif_device_present(efx->net_dev))
		netif_tx_wake_all_queues(efx->net_dev);
668 669
}

670
static void efx_stop_datapath(struct efx_nic *efx)
671 672 673 674
{
	struct efx_channel *channel;
	struct efx_tx_queue *tx_queue;
	struct efx_rx_queue *rx_queue;
675
	int rc;
676 677 678 679

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

680 681
	efx_ptp_stop_datapath(efx);

682 683 684 685 686 687
	/* Stop RX refill */
	efx_for_each_channel(channel, efx) {
		efx_for_each_channel_rx_queue(rx_queue, channel)
			rx_queue->refill_enabled = false;
	}

688
	efx_for_each_channel(channel, efx) {
689 690 691 692 693 694 695 696 697 698
		/* RX packet processing is pipelined, so wait for the
		 * NAPI handler to complete.  At least event queue 0
		 * might be kept active by non-data events, so don't
		 * use napi_synchronize() but actually disable NAPI
		 * temporarily.
		 */
		if (efx_channel_has_rx_queue(channel)) {
			efx_stop_eventq(channel);
			efx_start_eventq(channel);
		}
699
	}
700

701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718
	rc = efx->type->fini_dmaq(efx);
	if (rc && EFX_WORKAROUND_7803(efx)) {
		/* Schedule a reset to recover from the flush failure. The
		 * descriptor caches reference memory we're about to free,
		 * but falcon_reconfigure_mac_wrapper() won't reconnect
		 * the MACs because of the pending reset.
		 */
		netif_err(efx, drv, efx->net_dev,
			  "Resetting to recover from flush failure\n");
		efx_schedule_reset(efx, RESET_TYPE_ALL);
	} else if (rc) {
		netif_err(efx, drv, efx->net_dev, "failed to flush queues\n");
	} else {
		netif_dbg(efx, drv, efx->net_dev,
			  "successfully flushed all queues\n");
	}

	efx_for_each_channel(channel, efx) {
719 720
		efx_for_each_channel_rx_queue(rx_queue, channel)
			efx_fini_rx_queue(rx_queue);
721
		efx_for_each_possible_channel_tx_queue(tx_queue, channel)
722 723 724 725 726 727 728 729 730
			efx_fini_tx_queue(tx_queue);
	}
}

static void efx_remove_channel(struct efx_channel *channel)
{
	struct efx_tx_queue *tx_queue;
	struct efx_rx_queue *rx_queue;

731 732
	netif_dbg(channel->efx, drv, channel->efx->net_dev,
		  "destroy chan %d\n", channel->channel);
733 734 735

	efx_for_each_channel_rx_queue(rx_queue, channel)
		efx_remove_rx_queue(rx_queue);
736
	efx_for_each_possible_channel_tx_queue(tx_queue, channel)
737 738
		efx_remove_tx_queue(tx_queue);
	efx_remove_eventq(channel);
739
	channel->type->post_remove(channel);
740 741
}

742 743 744 745 746 747 748 749 750 751 752 753 754
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;
755
	unsigned i, next_buffer_table = 0;
756
	int rc, rc2;
757 758 759 760

	rc = efx_check_disabled(efx);
	if (rc)
		return rc;
761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782

	/* Not all channels should be reallocated. We must avoid
	 * reallocating their buffer table entries.
	 */
	efx_for_each_channel(channel, efx) {
		struct efx_rx_queue *rx_queue;
		struct efx_tx_queue *tx_queue;

		if (channel->type->copy)
			continue;
		next_buffer_table = max(next_buffer_table,
					channel->eventq.index +
					channel->eventq.entries);
		efx_for_each_channel_rx_queue(rx_queue, channel)
			next_buffer_table = max(next_buffer_table,
						rx_queue->rxd.index +
						rx_queue->rxd.entries);
		efx_for_each_channel_tx_queue(tx_queue, channel)
			next_buffer_table = max(next_buffer_table,
						tx_queue->txd.index +
						tx_queue->txd.entries);
	}
783

784
	efx_device_detach_sync(efx);
785
	efx_stop_all(efx);
B
Ben Hutchings 已提交
786
	efx_soft_disable_interrupts(efx);
787

788
	/* Clone channels (where possible) */
789 790
	memset(other_channel, 0, sizeof(other_channel));
	for (i = 0; i < efx->n_channels; i++) {
791 792 793
		channel = efx->channel[i];
		if (channel->type->copy)
			channel = channel->type->copy(channel);
794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811
		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;
	}

812 813
	/* Restart buffer table allocation */
	efx->next_buffer_table = next_buffer_table;
814 815

	for (i = 0; i < efx->n_channels; i++) {
816 817 818 819 820 821 822
		channel = efx->channel[i];
		if (!channel->type->copy)
			continue;
		rc = efx_probe_channel(channel);
		if (rc)
			goto rollback;
		efx_init_napi_channel(efx->channel[i]);
823
	}
824

825
out:
826 827 828 829 830 831 832 833 834
	/* Destroy unused channel structures */
	for (i = 0; i < efx->n_channels; i++) {
		channel = other_channel[i];
		if (channel && channel->type->copy) {
			efx_fini_napi_channel(channel);
			efx_remove_channel(channel);
			kfree(channel);
		}
	}
835

836 837 838 839 840 841 842 843 844 845
	rc2 = efx_soft_enable_interrupts(efx);
	if (rc2) {
		rc = rc ? rc : rc2;
		netif_err(efx, drv, efx->net_dev,
			  "unable to restart interrupts on channel reallocation\n");
		efx_schedule_reset(efx, RESET_TYPE_DISABLE);
	} else {
		efx_start_all(efx);
		netif_device_attach(efx->net_dev);
	}
846 847 848 849 850 851 852 853 854 855 856 857 858 859
	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;
}

860
void efx_schedule_slow_fill(struct efx_rx_queue *rx_queue)
861
{
862
	mod_timer(&rx_queue->slow_fill, jiffies + msecs_to_jiffies(100));
863 864
}

865 866
static const struct efx_channel_type efx_default_channel_type = {
	.pre_probe		= efx_channel_dummy_op_int,
867
	.post_remove		= efx_channel_dummy_op_void,
868 869 870 871 872 873 874 875 876 877
	.get_name		= efx_get_channel_name,
	.copy			= efx_copy_channel,
	.keep_eventq		= false,
};

int efx_channel_dummy_op_int(struct efx_channel *channel)
{
	return 0;
}

878 879 880 881
void efx_channel_dummy_op_void(struct efx_channel *channel)
{
}

882 883 884 885 886 887 888 889 890 891
/**************************************************************************
 *
 * 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
892
void efx_link_status_changed(struct efx_nic *efx)
893
{
894 895
	struct efx_link_state *link_state = &efx->link_state;

896 897 898 899 900 901 902
	/* 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;

903
	if (link_state->up != netif_carrier_ok(efx->net_dev)) {
904 905
		efx->n_link_state_changes++;

906
		if (link_state->up)
907 908 909 910 911 912
			netif_carrier_on(efx->net_dev);
		else
			netif_carrier_off(efx->net_dev);
	}

	/* Status message for kernel log */
B
Ben Hutchings 已提交
913
	if (link_state->up)
914
		netif_info(efx, link, efx->net_dev,
915
			   "link up at %uMbps %s-duplex (MTU %d)\n",
916
			   link_state->speed, link_state->fd ? "full" : "half",
917
			   efx->net_dev->mtu);
B
Ben Hutchings 已提交
918
	else
919
		netif_info(efx, link, efx->net_dev, "link down\n");
920 921
}

B
Ben Hutchings 已提交
922 923 924 925 926 927 928 929 930 931 932 933 934
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;
	}
}

935
void efx_link_set_wanted_fc(struct efx_nic *efx, u8 wanted_fc)
B
Ben Hutchings 已提交
936 937 938 939 940 941 942 943 944 945 946 947 948 949
{
	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;
	}
}

950 951
static void efx_fini_port(struct efx_nic *efx);

B
Ben Hutchings 已提交
952 953 954 955 956 957 958 959
/* 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)
960
{
B
Ben Hutchings 已提交
961 962
	enum efx_phy_mode phy_mode;
	int rc;
963

B
Ben Hutchings 已提交
964
	WARN_ON(!mutex_is_locked(&efx->mac_lock));
965

B
Ben Hutchings 已提交
966 967
	/* Disable PHY transmit in mac level loopbacks */
	phy_mode = efx->phy_mode;
968 969 970 971 972
	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
973
	rc = efx->type->reconfigure_port(efx);
974

B
Ben Hutchings 已提交
975 976
	if (rc)
		efx->phy_mode = phy_mode;
977

B
Ben Hutchings 已提交
978
	return rc;
979 980 981 982
}

/* Reinitialise the MAC to pick up new PHY settings, even if the port is
 * disabled. */
B
Ben Hutchings 已提交
983
int efx_reconfigure_port(struct efx_nic *efx)
984
{
B
Ben Hutchings 已提交
985 986
	int rc;

987 988 989
	EFX_ASSERT_RESET_SERIALISED(efx);

	mutex_lock(&efx->mac_lock);
B
Ben Hutchings 已提交
990
	rc = __efx_reconfigure_port(efx);
991
	mutex_unlock(&efx->mac_lock);
B
Ben Hutchings 已提交
992 993

	return rc;
994 995
}

996 997 998
/* Asynchronous work item for changing MAC promiscuity and multicast
 * hash.  Avoid a drain/rx_ingress enable by reconfiguring the current
 * MAC directly. */
999 1000 1001 1002 1003
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);
1004
	if (efx->port_enabled)
1005
		efx->type->reconfigure_mac(efx);
1006 1007 1008
	mutex_unlock(&efx->mac_lock);
}

1009 1010 1011 1012
static int efx_probe_port(struct efx_nic *efx)
{
	int rc;

1013
	netif_dbg(efx, probe, efx->net_dev, "create port\n");
1014

1015 1016 1017
	if (phy_flash_cfg)
		efx->phy_mode = PHY_MODE_SPECIAL;

1018 1019
	/* Connect up MAC/PHY operations table */
	rc = efx->type->probe_port(efx);
1020
	if (rc)
1021
		return rc;
1022

1023
	/* Initialise MAC address to permanent address */
1024
	ether_addr_copy(efx->net_dev->dev_addr, efx->net_dev->perm_addr);
1025 1026 1027 1028 1029 1030 1031 1032

	return 0;
}

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

1033
	netif_dbg(efx, drv, efx->net_dev, "init port\n");
1034

1035 1036
	mutex_lock(&efx->mac_lock);

1037
	rc = efx->phy_op->init(efx);
1038
	if (rc)
1039
		goto fail1;
1040

1041
	efx->port_initialized = true;
1042

B
Ben Hutchings 已提交
1043 1044
	/* Reconfigure the MAC before creating dma queues (required for
	 * Falcon/A1 where RX_INGR_EN/TX_DRAIN_EN isn't supported) */
1045
	efx->type->reconfigure_mac(efx);
B
Ben Hutchings 已提交
1046 1047 1048

	/* Ensure the PHY advertises the correct flow control settings */
	rc = efx->phy_op->reconfigure(efx);
1049
	if (rc && rc != -EPERM)
B
Ben Hutchings 已提交
1050 1051
		goto fail2;

1052
	mutex_unlock(&efx->mac_lock);
1053
	return 0;
1054

1055
fail2:
1056
	efx->phy_op->fini(efx);
1057 1058
fail1:
	mutex_unlock(&efx->mac_lock);
1059
	return rc;
1060 1061 1062 1063
}

static void efx_start_port(struct efx_nic *efx)
{
1064
	netif_dbg(efx, ifup, efx->net_dev, "start port\n");
1065 1066 1067
	BUG_ON(efx->port_enabled);

	mutex_lock(&efx->mac_lock);
1068
	efx->port_enabled = true;
1069

1070
	/* Ensure MAC ingress/egress is enabled */
1071
	efx->type->reconfigure_mac(efx);
1072

1073 1074 1075
	mutex_unlock(&efx->mac_lock);
}

1076 1077 1078 1079 1080
/* Cancel work for MAC reconfiguration, periodic hardware monitoring
 * and the async self-test, wait for them to finish and prevent them
 * being scheduled again.  This doesn't cover online resets, which
 * should only be cancelled when removing the device.
 */
1081 1082
static void efx_stop_port(struct efx_nic *efx)
{
1083
	netif_dbg(efx, ifdown, efx->net_dev, "stop port\n");
1084

1085 1086
	EFX_ASSERT_RESET_SERIALISED(efx);

1087
	mutex_lock(&efx->mac_lock);
1088
	efx->port_enabled = false;
1089 1090 1091
	mutex_unlock(&efx->mac_lock);

	/* Serialise against efx_set_multicast_list() */
1092 1093
	netif_addr_lock_bh(efx->net_dev);
	netif_addr_unlock_bh(efx->net_dev);
1094 1095 1096 1097

	cancel_delayed_work_sync(&efx->monitor_work);
	efx_selftest_async_cancel(efx);
	cancel_work_sync(&efx->mac_work);
1098 1099 1100 1101
}

static void efx_fini_port(struct efx_nic *efx)
{
1102
	netif_dbg(efx, drv, efx->net_dev, "shut down port\n");
1103 1104 1105 1106

	if (!efx->port_initialized)
		return;

1107
	efx->phy_op->fini(efx);
1108
	efx->port_initialized = false;
1109

1110
	efx->link_state.up = false;
1111 1112 1113 1114 1115
	efx_link_status_changed(efx);
}

static void efx_remove_port(struct efx_nic *efx)
{
1116
	netif_dbg(efx, drv, efx->net_dev, "destroying port\n");
1117

1118
	efx->type->remove_port(efx);
1119 1120 1121 1122 1123 1124 1125 1126
}

/**************************************************************************
 *
 * NIC handling
 *
 **************************************************************************/

1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197
static LIST_HEAD(efx_primary_list);
static LIST_HEAD(efx_unassociated_list);

static bool efx_same_controller(struct efx_nic *left, struct efx_nic *right)
{
	return left->type == right->type &&
		left->vpd_sn && right->vpd_sn &&
		!strcmp(left->vpd_sn, right->vpd_sn);
}

static void efx_associate(struct efx_nic *efx)
{
	struct efx_nic *other, *next;

	if (efx->primary == efx) {
		/* Adding primary function; look for secondaries */

		netif_dbg(efx, probe, efx->net_dev, "adding to primary list\n");
		list_add_tail(&efx->node, &efx_primary_list);

		list_for_each_entry_safe(other, next, &efx_unassociated_list,
					 node) {
			if (efx_same_controller(efx, other)) {
				list_del(&other->node);
				netif_dbg(other, probe, other->net_dev,
					  "moving to secondary list of %s %s\n",
					  pci_name(efx->pci_dev),
					  efx->net_dev->name);
				list_add_tail(&other->node,
					      &efx->secondary_list);
				other->primary = efx;
			}
		}
	} else {
		/* Adding secondary function; look for primary */

		list_for_each_entry(other, &efx_primary_list, node) {
			if (efx_same_controller(efx, other)) {
				netif_dbg(efx, probe, efx->net_dev,
					  "adding to secondary list of %s %s\n",
					  pci_name(other->pci_dev),
					  other->net_dev->name);
				list_add_tail(&efx->node,
					      &other->secondary_list);
				efx->primary = other;
				return;
			}
		}

		netif_dbg(efx, probe, efx->net_dev,
			  "adding to unassociated list\n");
		list_add_tail(&efx->node, &efx_unassociated_list);
	}
}

static void efx_dissociate(struct efx_nic *efx)
{
	struct efx_nic *other, *next;

	list_del(&efx->node);
	efx->primary = NULL;

	list_for_each_entry_safe(other, next, &efx->secondary_list, node) {
		list_del(&other->node);
		netif_dbg(other, probe, other->net_dev,
			  "moving to unassociated list\n");
		list_add_tail(&other->node, &efx_unassociated_list);
		other->primary = NULL;
	}
}

1198 1199 1200 1201 1202
/* 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;
1203
	unsigned int mem_map_size = efx->type->mem_map_size(efx);
1204
	int rc, bar;
1205

1206
	netif_dbg(efx, probe, efx->net_dev, "initialising I/O\n");
1207

1208 1209
	bar = efx->type->mem_bar;

1210 1211
	rc = pci_enable_device(pci_dev);
	if (rc) {
1212 1213
		netif_err(efx, probe, efx->net_dev,
			  "failed to enable PCI device\n");
1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224
		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) {
1225
		if (dma_supported(&pci_dev->dev, dma_mask)) {
1226
			rc = dma_set_mask_and_coherent(&pci_dev->dev, dma_mask);
1227 1228 1229
			if (rc == 0)
				break;
		}
1230 1231 1232
		dma_mask >>= 1;
	}
	if (rc) {
1233 1234
		netif_err(efx, probe, efx->net_dev,
			  "could not find a suitable DMA mask\n");
1235 1236
		goto fail2;
	}
1237 1238
	netif_dbg(efx, probe, efx->net_dev,
		  "using DMA mask %llx\n", (unsigned long long) dma_mask);
1239

1240 1241
	efx->membase_phys = pci_resource_start(efx->pci_dev, bar);
	rc = pci_request_region(pci_dev, bar, "sfc");
1242
	if (rc) {
1243 1244
		netif_err(efx, probe, efx->net_dev,
			  "request for memory BAR failed\n");
1245 1246 1247
		rc = -EIO;
		goto fail3;
	}
1248
	efx->membase = ioremap_nocache(efx->membase_phys, mem_map_size);
1249
	if (!efx->membase) {
1250 1251
		netif_err(efx, probe, efx->net_dev,
			  "could not map memory BAR at %llx+%x\n",
1252
			  (unsigned long long)efx->membase_phys, mem_map_size);
1253 1254 1255
		rc = -ENOMEM;
		goto fail4;
	}
1256 1257
	netif_dbg(efx, probe, efx->net_dev,
		  "memory BAR at %llx+%x (virtual %p)\n",
1258 1259
		  (unsigned long long)efx->membase_phys, mem_map_size,
		  efx->membase);
1260 1261 1262 1263

	return 0;

 fail4:
1264
	pci_release_region(efx->pci_dev, bar);
1265
 fail3:
1266
	efx->membase_phys = 0;
1267 1268 1269 1270 1271 1272 1273 1274
 fail2:
	pci_disable_device(efx->pci_dev);
 fail1:
	return rc;
}

static void efx_fini_io(struct efx_nic *efx)
{
1275 1276
	int bar;

1277
	netif_dbg(efx, drv, efx->net_dev, "shutting down I/O\n");
1278 1279 1280 1281 1282 1283 1284

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

	if (efx->membase_phys) {
1285 1286
		bar = efx->type->mem_bar;
		pci_release_region(efx->pci_dev, bar);
1287
		efx->membase_phys = 0;
1288 1289 1290 1291 1292
	}

	pci_disable_device(efx->pci_dev);
}

1293 1294 1295 1296 1297 1298 1299 1300 1301
void efx_set_default_rx_indir_table(struct efx_nic *efx)
{
	size_t i;

	for (i = 0; i < ARRAY_SIZE(efx->rx_indir_table); i++)
		efx->rx_indir_table[i] =
			ethtool_rxfh_indir_default(i, efx->rss_spread);
}

1302
static unsigned int efx_wanted_parallelism(struct efx_nic *efx)
1303
{
1304
	cpumask_var_t thread_mask;
1305
	unsigned int count;
1306
	int cpu;
1307

1308 1309 1310 1311 1312 1313 1314 1315
	if (rss_cpus) {
		count = rss_cpus;
	} else {
		if (unlikely(!zalloc_cpumask_var(&thread_mask, GFP_KERNEL))) {
			netif_warn(efx, probe, efx->net_dev,
				   "RSS disabled due to allocation failure\n");
			return 1;
		}
1316

1317 1318 1319 1320 1321 1322 1323 1324 1325 1326
		count = 0;
		for_each_online_cpu(cpu) {
			if (!cpumask_test_cpu(cpu, thread_mask)) {
				++count;
				cpumask_or(thread_mask, thread_mask,
					   topology_thread_cpumask(cpu));
			}
		}

		free_cpumask_var(thread_mask);
R
Rusty Russell 已提交
1327 1328
	}

1329 1330 1331
	/* If RSS is requested for the PF *and* VFs then we can't write RSS
	 * table entries that are inaccessible to VFs
	 */
1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342
#ifdef CONFIG_SFC_SRIOV
	if (efx->type->sriov_wanted) {
		if (efx->type->sriov_wanted(efx) && efx_vf_size(efx) > 1 &&
		    count > efx_vf_size(efx)) {
			netif_warn(efx, probe, efx->net_dev,
				   "Reducing number of RSS channels from %u to %u for "
				   "VF support. Increase vf-msix-limit to use more "
				   "channels on the PF.\n",
				   count, efx_vf_size(efx));
			count = efx_vf_size(efx);
		}
1343
	}
1344
#endif
1345 1346 1347 1348 1349 1350 1351

	return count;
}

/* Probe the number and type of interrupts we are able to obtain, and
 * the resulting numbers of channels and RX queues.
 */
1352
static int efx_probe_interrupts(struct efx_nic *efx)
1353
{
1354 1355
	unsigned int extra_channels = 0;
	unsigned int i, j;
1356
	int rc;
1357

1358 1359 1360 1361
	for (i = 0; i < EFX_MAX_EXTRA_CHANNELS; i++)
		if (efx->extra_channel_type[i])
			++extra_channels;

1362
	if (efx->interrupt_mode == EFX_INT_MODE_MSIX) {
1363
		struct msix_entry xentries[EFX_MAX_CHANNELS];
1364
		unsigned int n_channels;
1365

1366
		n_channels = efx_wanted_parallelism(efx);
B
Ben Hutchings 已提交
1367 1368
		if (separate_tx_channels)
			n_channels *= 2;
1369
		n_channels += extra_channels;
1370
		n_channels = min(n_channels, efx->max_channels);
1371

B
Ben Hutchings 已提交
1372
		for (i = 0; i < n_channels; i++)
1373
			xentries[i].entry = i;
1374 1375 1376 1377 1378 1379 1380 1381
		rc = pci_enable_msix_range(efx->pci_dev,
					   xentries, 1, n_channels);
		if (rc < 0) {
			/* Fall back to single channel MSI */
			efx->interrupt_mode = EFX_INT_MODE_MSI;
			netif_err(efx, drv, efx->net_dev,
				  "could not enable MSI-X\n");
		} else if (rc < n_channels) {
1382 1383
			netif_err(efx, drv, efx->net_dev,
				  "WARNING: Insufficient MSI-X vectors"
1384
				  " available (%d < %u).\n", rc, n_channels);
1385 1386
			netif_err(efx, drv, efx->net_dev,
				  "WARNING: Performance may be reduced.\n");
B
Ben Hutchings 已提交
1387
			n_channels = rc;
1388 1389
		}

1390
		if (rc > 0) {
B
Ben Hutchings 已提交
1391
			efx->n_channels = n_channels;
1392 1393
			if (n_channels > extra_channels)
				n_channels -= extra_channels;
B
Ben Hutchings 已提交
1394
			if (separate_tx_channels) {
1395 1396 1397 1398
				efx->n_tx_channels = max(n_channels / 2, 1U);
				efx->n_rx_channels = max(n_channels -
							 efx->n_tx_channels,
							 1U);
B
Ben Hutchings 已提交
1399
			} else {
1400 1401
				efx->n_tx_channels = n_channels;
				efx->n_rx_channels = n_channels;
B
Ben Hutchings 已提交
1402
			}
1403
			for (i = 0; i < efx->n_channels; i++)
1404 1405
				efx_get_channel(efx, i)->irq =
					xentries[i].vector;
1406 1407 1408 1409 1410
		}
	}

	/* Try single interrupt MSI */
	if (efx->interrupt_mode == EFX_INT_MODE_MSI) {
1411
		efx->n_channels = 1;
B
Ben Hutchings 已提交
1412 1413
		efx->n_rx_channels = 1;
		efx->n_tx_channels = 1;
1414 1415
		rc = pci_enable_msi(efx->pci_dev);
		if (rc == 0) {
1416
			efx_get_channel(efx, 0)->irq = efx->pci_dev->irq;
1417
		} else {
1418 1419
			netif_err(efx, drv, efx->net_dev,
				  "could not enable MSI\n");
1420 1421 1422 1423 1424 1425
			efx->interrupt_mode = EFX_INT_MODE_LEGACY;
		}
	}

	/* Assume legacy interrupts */
	if (efx->interrupt_mode == EFX_INT_MODE_LEGACY) {
1426
		efx->n_channels = 1 + (separate_tx_channels ? 1 : 0);
B
Ben Hutchings 已提交
1427 1428
		efx->n_rx_channels = 1;
		efx->n_tx_channels = 1;
1429 1430
		efx->legacy_irq = efx->pci_dev->irq;
	}
1431

1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446
	/* Assign extra channels if possible */
	j = efx->n_channels;
	for (i = 0; i < EFX_MAX_EXTRA_CHANNELS; i++) {
		if (!efx->extra_channel_type[i])
			continue;
		if (efx->interrupt_mode != EFX_INT_MODE_MSIX ||
		    efx->n_channels <= extra_channels) {
			efx->extra_channel_type[i]->handle_no_channel(efx);
		} else {
			--j;
			efx_get_channel(efx, j)->type =
				efx->extra_channel_type[i];
		}
	}

1447
	/* RSS might be usable on VFs even if it is disabled on the PF */
1448 1449 1450 1451 1452 1453 1454 1455 1456
#ifdef CONFIG_SFC_SRIOV
	if (efx->type->sriov_wanted) {
		efx->rss_spread = ((efx->n_rx_channels > 1 ||
				    !efx->type->sriov_wanted(efx)) ?
				   efx->n_rx_channels : efx_vf_size(efx));
		return 0;
	}
#endif
	efx->rss_spread = efx->n_rx_channels;
1457

1458
	return 0;
1459 1460
}

1461
static int efx_soft_enable_interrupts(struct efx_nic *efx)
1462
{
1463 1464
	struct efx_channel *channel, *end_channel;
	int rc;
1465

1466 1467
	BUG_ON(efx->state == STATE_DISABLED);

B
Ben Hutchings 已提交
1468 1469
	efx->irq_soft_enabled = true;
	smp_wmb();
1470 1471

	efx_for_each_channel(channel, efx) {
1472 1473 1474 1475 1476
		if (!channel->type->keep_eventq) {
			rc = efx_init_eventq(channel);
			if (rc)
				goto fail;
		}
1477 1478 1479 1480
		efx_start_eventq(channel);
	}

	efx_mcdi_mode_event(efx);
1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493

	return 0;
fail:
	end_channel = channel;
	efx_for_each_channel(channel, efx) {
		if (channel == end_channel)
			break;
		efx_stop_eventq(channel);
		if (!channel->type->keep_eventq)
			efx_fini_eventq(channel);
	}

	return rc;
1494 1495
}

B
Ben Hutchings 已提交
1496
static void efx_soft_disable_interrupts(struct efx_nic *efx)
1497 1498 1499
{
	struct efx_channel *channel;

1500 1501 1502
	if (efx->state == STATE_DISABLED)
		return;

1503 1504
	efx_mcdi_mode_poll(efx);

B
Ben Hutchings 已提交
1505 1506 1507 1508
	efx->irq_soft_enabled = false;
	smp_wmb();

	if (efx->legacy_irq)
1509 1510 1511 1512 1513 1514 1515
		synchronize_irq(efx->legacy_irq);

	efx_for_each_channel(channel, efx) {
		if (channel->irq)
			synchronize_irq(channel->irq);

		efx_stop_eventq(channel);
B
Ben Hutchings 已提交
1516
		if (!channel->type->keep_eventq)
1517
			efx_fini_eventq(channel);
1518
	}
1519 1520 1521

	/* Flush the asynchronous MCDI request queue */
	efx_mcdi_flush_async(efx);
1522 1523
}

1524
static int efx_enable_interrupts(struct efx_nic *efx)
B
Ben Hutchings 已提交
1525
{
1526 1527
	struct efx_channel *channel, *end_channel;
	int rc;
B
Ben Hutchings 已提交
1528 1529 1530 1531 1532 1533 1534 1535

	BUG_ON(efx->state == STATE_DISABLED);

	if (efx->eeh_disabled_legacy_irq) {
		enable_irq(efx->legacy_irq);
		efx->eeh_disabled_legacy_irq = false;
	}

1536
	efx->type->irq_enable_master(efx);
B
Ben Hutchings 已提交
1537 1538

	efx_for_each_channel(channel, efx) {
1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556
		if (channel->type->keep_eventq) {
			rc = efx_init_eventq(channel);
			if (rc)
				goto fail;
		}
	}

	rc = efx_soft_enable_interrupts(efx);
	if (rc)
		goto fail;

	return 0;

fail:
	end_channel = channel;
	efx_for_each_channel(channel, efx) {
		if (channel == end_channel)
			break;
B
Ben Hutchings 已提交
1557
		if (channel->type->keep_eventq)
1558
			efx_fini_eventq(channel);
B
Ben Hutchings 已提交
1559 1560
	}

1561 1562 1563
	efx->type->irq_disable_non_ev(efx);

	return rc;
B
Ben Hutchings 已提交
1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576
}

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

	efx_soft_disable_interrupts(efx);

	efx_for_each_channel(channel, efx) {
		if (channel->type->keep_eventq)
			efx_fini_eventq(channel);
	}

1577
	efx->type->irq_disable_non_ev(efx);
B
Ben Hutchings 已提交
1578 1579
}

1580 1581 1582 1583 1584
static void efx_remove_interrupts(struct efx_nic *efx)
{
	struct efx_channel *channel;

	/* Remove MSI/MSI-X interrupts */
1585
	efx_for_each_channel(channel, efx)
1586 1587 1588 1589 1590 1591 1592 1593
		channel->irq = 0;
	pci_disable_msi(efx->pci_dev);
	pci_disable_msix(efx->pci_dev);

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

1594
static void efx_set_channels(struct efx_nic *efx)
1595
{
1596 1597 1598
	struct efx_channel *channel;
	struct efx_tx_queue *tx_queue;

1599
	efx->tx_channel_offset =
B
Ben Hutchings 已提交
1600
		separate_tx_channels ? efx->n_channels - efx->n_tx_channels : 0;
1601

1602 1603
	/* We need to mark which channels really have RX and TX
	 * queues, and adjust the TX queue numbers if we have separate
1604 1605 1606
	 * RX-only and TX-only channels.
	 */
	efx_for_each_channel(channel, efx) {
1607 1608 1609 1610 1611
		if (channel->channel < efx->n_rx_channels)
			channel->rx_queue.core_index = channel->channel;
		else
			channel->rx_queue.core_index = -1;

1612 1613 1614 1615
		efx_for_each_channel_tx_queue(tx_queue, channel)
			tx_queue->queue -= (efx->tx_channel_offset *
					    EFX_TXQ_TYPES);
	}
1616 1617 1618 1619 1620 1621
}

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

1622
	netif_dbg(efx, probe, efx->net_dev, "creating NIC\n");
1623 1624

	/* Carry out hardware-type specific initialisation */
1625
	rc = efx->type->probe(efx);
1626 1627 1628
	if (rc)
		return rc;

B
Ben Hutchings 已提交
1629
	/* Determine the number of channels and queues by trying to hook
1630
	 * in MSI-X interrupts. */
1631 1632
	rc = efx_probe_interrupts(efx);
	if (rc)
1633
		goto fail1;
1634

1635 1636
	efx_set_channels(efx);

1637 1638 1639
	rc = efx->type->dimension_resources(efx);
	if (rc)
		goto fail2;
1640

1641
	if (efx->n_channels > 1)
1642 1643 1644
		netdev_rss_key_fill(&efx->rx_hash_key,
				    sizeof(efx->rx_hash_key));
	efx_set_default_rx_indir_table(efx);
1645

1646 1647
	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);
1648 1649

	/* Initialise the interrupt moderation settings */
1650 1651
	efx_init_irq_moderation(efx, tx_irq_mod_usec, rx_irq_mod_usec, true,
				true);
1652 1653

	return 0;
1654

1655 1656 1657
fail2:
	efx_remove_interrupts(efx);
fail1:
1658 1659
	efx->type->remove(efx);
	return rc;
1660 1661 1662 1663
}

static void efx_remove_nic(struct efx_nic *efx)
{
1664
	netif_dbg(efx, drv, efx->net_dev, "destroying NIC\n");
1665 1666

	efx_remove_interrupts(efx);
1667
	efx->type->remove(efx);
1668 1669
}

1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707
static int efx_probe_filters(struct efx_nic *efx)
{
	int rc;

	spin_lock_init(&efx->filter_lock);

	rc = efx->type->filter_table_probe(efx);
	if (rc)
		return rc;

#ifdef CONFIG_RFS_ACCEL
	if (efx->type->offload_features & NETIF_F_NTUPLE) {
		efx->rps_flow_id = kcalloc(efx->type->max_rx_ip_filters,
					   sizeof(*efx->rps_flow_id),
					   GFP_KERNEL);
		if (!efx->rps_flow_id) {
			efx->type->filter_table_remove(efx);
			return -ENOMEM;
		}
	}
#endif

	return 0;
}

static void efx_remove_filters(struct efx_nic *efx)
{
#ifdef CONFIG_RFS_ACCEL
	kfree(efx->rps_flow_id);
#endif
	efx->type->filter_table_remove(efx);
}

static void efx_restore_filters(struct efx_nic *efx)
{
	efx->type->filter_table_restore(efx);
}

1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719
/**************************************************************************
 *
 * NIC startup/shutdown
 *
 *************************************************************************/

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

	rc = efx_probe_nic(efx);
	if (rc) {
1720
		netif_err(efx, probe, efx->net_dev, "failed to create NIC\n");
1721 1722 1723 1724 1725
		goto fail1;
	}

	rc = efx_probe_port(efx);
	if (rc) {
1726
		netif_err(efx, probe, efx->net_dev, "failed to create port\n");
1727 1728 1729
		goto fail2;
	}

1730 1731 1732 1733 1734
	BUILD_BUG_ON(EFX_DEFAULT_DMAQ_SIZE < EFX_RXQ_MIN_ENT);
	if (WARN_ON(EFX_DEFAULT_DMAQ_SIZE < EFX_TXQ_MIN_ENT(efx))) {
		rc = -EINVAL;
		goto fail3;
	}
1735
	efx->rxq_entries = efx->txq_entries = EFX_DEFAULT_DMAQ_SIZE;
1736

1737 1738 1739 1740 1741 1742 1743 1744
#ifdef CONFIG_SFC_SRIOV
	rc = efx->type->vswitching_probe(efx);
	if (rc) /* not fatal; the PF will still work fine */
		netif_warn(efx, probe, efx->net_dev,
			   "failed to setup vswitching rc=%d;"
			   " VFs may not function\n", rc);
#endif

B
Ben Hutchings 已提交
1745 1746 1747 1748
	rc = efx_probe_filters(efx);
	if (rc) {
		netif_err(efx, probe, efx->net_dev,
			  "failed to create filter tables\n");
1749
		goto fail4;
B
Ben Hutchings 已提交
1750 1751
	}

1752 1753
	rc = efx_probe_channels(efx);
	if (rc)
1754
		goto fail5;
1755

1756 1757
	return 0;

1758
 fail5:
1759
	efx_remove_filters(efx);
1760 1761 1762 1763
 fail4:
#ifdef CONFIG_SFC_SRIOV
	efx->type->vswitching_remove(efx);
#endif
1764 1765 1766 1767 1768 1769 1770 1771
 fail3:
	efx_remove_port(efx);
 fail2:
	efx_remove_nic(efx);
 fail1:
	return rc;
}

1772 1773 1774 1775 1776 1777
/* If the interface is supposed to be running but is not, start
 * the hardware and software data path, regular activity for the port
 * (MAC statistics, link polling, etc.) and schedule the port to be
 * reconfigured.  Interrupts must already be enabled.  This function
 * is safe to call multiple times, so long as the NIC is not disabled.
 * Requires the RTNL lock.
1778
 */
1779 1780 1781
static void efx_start_all(struct efx_nic *efx)
{
	EFX_ASSERT_RESET_SERIALISED(efx);
1782
	BUG_ON(efx->state == STATE_DISABLED);
1783 1784 1785

	/* Check that it is appropriate to restart the interface. All
	 * of these flags are safe to read under just the rtnl lock */
1786 1787
	if (efx->port_enabled || !netif_running(efx->net_dev) ||
	    efx->reset_pending)
1788 1789 1790
		return;

	efx_start_port(efx);
1791
	efx_start_datapath(efx);
1792

1793 1794
	/* Start the hardware monitor if there is one */
	if (efx->type->monitor != NULL)
1795 1796
		queue_delayed_work(efx->workqueue, &efx->monitor_work,
				   efx_monitor_interval);
1797 1798 1799 1800 1801

	/* If link state detection is normally event-driven, we have
	 * to poll now because we could have missed a change
	 */
	if (efx_nic_rev(efx) >= EFX_REV_SIENA_A0) {
1802 1803 1804 1805 1806
		mutex_lock(&efx->mac_lock);
		if (efx->phy_op->poll(efx))
			efx_link_status_changed(efx);
		mutex_unlock(&efx->mac_lock);
	}
1807

1808
	efx->type->start_stats(efx);
1809 1810 1811 1812
	efx->type->pull_stats(efx);
	spin_lock_bh(&efx->stats_lock);
	efx->type->update_stats(efx, NULL, NULL);
	spin_unlock_bh(&efx->stats_lock);
1813 1814
}

1815 1816 1817 1818 1819
/* Quiesce the hardware and software data path, and regular activity
 * for the port without bringing the link down.  Safe to call multiple
 * times with the NIC in almost any state, but interrupts should be
 * enabled.  Requires the RTNL lock.
 */
1820 1821 1822 1823 1824 1825 1826 1827
static void efx_stop_all(struct efx_nic *efx)
{
	EFX_ASSERT_RESET_SERIALISED(efx);

	/* port_enabled can be read safely under the rtnl lock */
	if (!efx->port_enabled)
		return;

1828 1829 1830 1831 1832 1833 1834
	/* update stats before we go down so we can accurately count
	 * rx_nodesc_drops
	 */
	efx->type->pull_stats(efx);
	spin_lock_bh(&efx->stats_lock);
	efx->type->update_stats(efx, NULL, NULL);
	spin_unlock_bh(&efx->stats_lock);
1835
	efx->type->stop_stats(efx);
1836 1837
	efx_stop_port(efx);

1838 1839 1840 1841 1842 1843
	/* Stop the kernel transmit interface.  This is only valid if
	 * the device is stopped or detached; otherwise the watchdog
	 * may fire immediately.
	 */
	WARN_ON(netif_running(efx->net_dev) &&
		netif_device_present(efx->net_dev));
1844 1845 1846
	netif_tx_disable(efx->net_dev);

	efx_stop_datapath(efx);
1847 1848 1849 1850
}

static void efx_remove_all(struct efx_nic *efx)
{
1851
	efx_remove_channels(efx);
1852
	efx_remove_filters(efx);
1853 1854 1855
#ifdef CONFIG_SFC_SRIOV
	efx->type->vswitching_remove(efx);
#endif
1856 1857 1858 1859 1860 1861 1862 1863 1864 1865
	efx_remove_port(efx);
	efx_remove_nic(efx);
}

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

1866
static unsigned int irq_mod_ticks(unsigned int usecs, unsigned int quantum_ns)
1867
{
1868 1869
	if (usecs == 0)
		return 0;
1870
	if (usecs * 1000 < quantum_ns)
1871
		return 1; /* never round down to 0 */
1872
	return usecs * 1000 / quantum_ns;
1873 1874
}

1875
/* Set interrupt moderation parameters */
1876 1877 1878
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)
1879
{
1880
	struct efx_channel *channel;
1881 1882 1883 1884 1885
	unsigned int irq_mod_max = DIV_ROUND_UP(efx->type->timer_period_max *
						efx->timer_quantum_ns,
						1000);
	unsigned int tx_ticks;
	unsigned int rx_ticks;
1886 1887 1888

	EFX_ASSERT_RESET_SERIALISED(efx);

1889
	if (tx_usecs > irq_mod_max || rx_usecs > irq_mod_max)
1890 1891
		return -EINVAL;

1892 1893 1894
	tx_ticks = irq_mod_ticks(tx_usecs, efx->timer_quantum_ns);
	rx_ticks = irq_mod_ticks(rx_usecs, efx->timer_quantum_ns);

1895 1896 1897 1898 1899 1900 1901
	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;
	}

1902
	efx->irq_rx_adaptive = rx_adaptive;
1903
	efx->irq_rx_moderation = rx_ticks;
1904
	efx_for_each_channel(channel, efx) {
1905
		if (efx_channel_has_rx_queue(channel))
1906
			channel->irq_moderation = rx_ticks;
1907
		else if (efx_channel_has_tx_queues(channel))
1908 1909
			channel->irq_moderation = tx_ticks;
	}
1910 1911

	return 0;
1912 1913
}

1914 1915 1916
void efx_get_irq_moderation(struct efx_nic *efx, unsigned int *tx_usecs,
			    unsigned int *rx_usecs, bool *rx_adaptive)
{
1917 1918 1919 1920
	/* We must round up when converting ticks to microseconds
	 * because we round down when converting the other way.
	 */

1921
	*rx_adaptive = efx->irq_rx_adaptive;
1922 1923 1924
	*rx_usecs = DIV_ROUND_UP(efx->irq_rx_moderation *
				 efx->timer_quantum_ns,
				 1000);
1925 1926 1927 1928 1929 1930 1931 1932

	/* 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
1933
		*tx_usecs = DIV_ROUND_UP(
1934
			efx->channel[efx->tx_channel_offset]->irq_moderation *
1935 1936
			efx->timer_quantum_ns,
			1000);
1937 1938
}

1939 1940 1941 1942 1943 1944
/**************************************************************************
 *
 * Hardware monitor
 *
 **************************************************************************/

1945
/* Run periodically off the general workqueue */
1946 1947 1948 1949 1950
static void efx_monitor(struct work_struct *data)
{
	struct efx_nic *efx = container_of(data, struct efx_nic,
					   monitor_work.work);

1951 1952 1953
	netif_vdbg(efx, timer, efx->net_dev,
		   "hardware monitor executing on CPU %d\n",
		   raw_smp_processor_id());
1954
	BUG_ON(efx->type->monitor == NULL);
1955 1956 1957

	/* If the mac_lock is already held then it is likely a port
	 * reconfiguration is already in place, which will likely do
1958 1959 1960 1961 1962 1963
	 * 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);
	}
1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979

	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)
{
1980
	struct efx_nic *efx = netdev_priv(net_dev);
1981
	struct mii_ioctl_data *data = if_mii(ifr);
1982

1983
	if (cmd == SIOCSHWTSTAMP)
1984 1985 1986
		return efx_ptp_set_ts_config(efx, ifr);
	if (cmd == SIOCGHWTSTAMP)
		return efx_ptp_get_ts_config(efx, ifr);
1987

1988 1989 1990 1991 1992 1993
	/* 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);
1994 1995 1996 1997 1998 1999 2000 2001
}

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

2002 2003 2004 2005 2006 2007 2008
static void efx_init_napi_channel(struct efx_channel *channel)
{
	struct efx_nic *efx = channel->efx;

	channel->napi_dev = efx->net_dev;
	netif_napi_add(channel->napi_dev, &channel->napi_str,
		       efx_poll, napi_weight);
2009 2010
	napi_hash_add(&channel->napi_str);
	efx_channel_init_lock(channel);
2011 2012
}

2013
static void efx_init_napi(struct efx_nic *efx)
2014 2015 2016
{
	struct efx_channel *channel;

2017 2018
	efx_for_each_channel(channel, efx)
		efx_init_napi_channel(channel);
2019 2020 2021 2022
}

static void efx_fini_napi_channel(struct efx_channel *channel)
{
2023
	if (channel->napi_dev) {
2024
		netif_napi_del(&channel->napi_str);
2025 2026
		napi_hash_del(&channel->napi_str);
	}
2027
	channel->napi_dev = NULL;
2028 2029 2030 2031 2032 2033
}

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

2034 2035
	efx_for_each_channel(channel, efx)
		efx_fini_napi_channel(channel);
2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051
}

/**************************************************************************
 *
 * 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)
{
2052
	struct efx_nic *efx = netdev_priv(net_dev);
2053 2054
	struct efx_channel *channel;

2055
	efx_for_each_channel(channel, efx)
2056 2057 2058 2059 2060
		efx_schedule_channel(channel);
}

#endif

2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091
#ifdef CONFIG_NET_RX_BUSY_POLL
static int efx_busy_poll(struct napi_struct *napi)
{
	struct efx_channel *channel =
		container_of(napi, struct efx_channel, napi_str);
	struct efx_nic *efx = channel->efx;
	int budget = 4;
	int old_rx_packets, rx_packets;

	if (!netif_running(efx->net_dev))
		return LL_FLUSH_FAILED;

	if (!efx_channel_lock_poll(channel))
		return LL_FLUSH_BUSY;

	old_rx_packets = channel->rx_queue.rx_packets;
	efx_process_channel(channel, budget);

	rx_packets = channel->rx_queue.rx_packets - old_rx_packets;

	/* There is no race condition with NAPI here.
	 * NAPI will automatically be rescheduled if it yielded during busy
	 * polling, because it was not able to take the lock and thus returned
	 * the full budget.
	 */
	efx_channel_unlock_poll(channel);

	return rx_packets;
}
#endif

2092 2093 2094 2095 2096 2097 2098 2099 2100
/**************************************************************************
 *
 * Kernel net device interface
 *
 *************************************************************************/

/* Context: process, rtnl_lock() held. */
static int efx_net_open(struct net_device *net_dev)
{
2101
	struct efx_nic *efx = netdev_priv(net_dev);
2102 2103
	int rc;

2104 2105
	netif_dbg(efx, ifup, efx->net_dev, "opening device on CPU %d\n",
		  raw_smp_processor_id());
2106

2107 2108 2109
	rc = efx_check_disabled(efx);
	if (rc)
		return rc;
2110 2111
	if (efx->phy_mode & PHY_MODE_SPECIAL)
		return -EBUSY;
2112 2113
	if (efx_mcdi_poll_reboot(efx) && efx_reset(efx, RESET_TYPE_ALL))
		return -EIO;
2114

2115 2116 2117 2118
	/* Notify the kernel of the link state polled during driver load,
	 * before the monitor starts running */
	efx_link_status_changed(efx);

2119
	efx_start_all(efx);
2120
	efx_selftest_async_start(efx);
2121 2122 2123 2124 2125 2126 2127 2128 2129
	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)
{
2130
	struct efx_nic *efx = netdev_priv(net_dev);
2131

2132 2133
	netif_dbg(efx, ifdown, efx->net_dev, "closing on CPU %d\n",
		  raw_smp_processor_id());
2134

2135 2136
	/* Stop the device and flush all the channels */
	efx_stop_all(efx);
2137 2138 2139 2140

	return 0;
}

2141
/* Context: process, dev_base_lock or RTNL held, non-blocking. */
B
Ben Hutchings 已提交
2142 2143
static struct rtnl_link_stats64 *efx_net_stats(struct net_device *net_dev,
					       struct rtnl_link_stats64 *stats)
2144
{
2145
	struct efx_nic *efx = netdev_priv(net_dev);
2146

2147
	spin_lock_bh(&efx->stats_lock);
2148
	efx->type->update_stats(efx, NULL, stats);
2149 2150
	spin_unlock_bh(&efx->stats_lock);

2151 2152 2153 2154 2155 2156
	return stats;
}

/* Context: netif_tx_lock held, BHs disabled. */
static void efx_watchdog(struct net_device *net_dev)
{
2157
	struct efx_nic *efx = netdev_priv(net_dev);
2158

2159 2160 2161
	netif_err(efx, tx_err, efx->net_dev,
		  "TX stuck with port_enabled=%d: resetting channels\n",
		  efx->port_enabled);
2162

2163
	efx_schedule_reset(efx, RESET_TYPE_TX_WATCHDOG);
2164 2165 2166 2167 2168 2169
}


/* Context: process, rtnl_lock() held. */
static int efx_change_mtu(struct net_device *net_dev, int new_mtu)
{
2170
	struct efx_nic *efx = netdev_priv(net_dev);
2171
	int rc;
2172

2173 2174 2175
	rc = efx_check_disabled(efx);
	if (rc)
		return rc;
2176 2177 2178
	if (new_mtu > EFX_MAX_MTU)
		return -EINVAL;

2179
	netif_dbg(efx, drv, efx->net_dev, "changing MTU to %d\n", new_mtu);
2180

2181 2182 2183
	efx_device_detach_sync(efx);
	efx_stop_all(efx);

B
Ben Hutchings 已提交
2184
	mutex_lock(&efx->mac_lock);
2185
	net_dev->mtu = new_mtu;
2186
	efx->type->reconfigure_mac(efx);
B
Ben Hutchings 已提交
2187 2188
	mutex_unlock(&efx->mac_lock);

2189
	efx_start_all(efx);
2190
	netif_device_attach(efx->net_dev);
2191
	return 0;
2192 2193 2194 2195
}

static int efx_set_mac_address(struct net_device *net_dev, void *data)
{
2196
	struct efx_nic *efx = netdev_priv(net_dev);
2197
	struct sockaddr *addr = data;
2198
	u8 *new_addr = addr->sa_data;
2199 2200
	u8 old_addr[6];
	int rc;
2201 2202

	if (!is_valid_ether_addr(new_addr)) {
2203 2204 2205
		netif_err(efx, drv, efx->net_dev,
			  "invalid ethernet MAC address requested: %pM\n",
			  new_addr);
2206
		return -EADDRNOTAVAIL;
2207 2208
	}

2209 2210
	/* save old address */
	ether_addr_copy(old_addr, net_dev->dev_addr);
2211
	ether_addr_copy(net_dev->dev_addr, new_addr);
2212 2213 2214 2215 2216 2217 2218
	if (efx->type->sriov_mac_address_changed) {
		rc = efx->type->sriov_mac_address_changed(efx);
		if (rc) {
			ether_addr_copy(net_dev->dev_addr, old_addr);
			return rc;
		}
	}
2219 2220

	/* Reconfigure the MAC */
B
Ben Hutchings 已提交
2221
	mutex_lock(&efx->mac_lock);
2222
	efx->type->reconfigure_mac(efx);
B
Ben Hutchings 已提交
2223
	mutex_unlock(&efx->mac_lock);
2224 2225 2226 2227

	return 0;
}

2228
/* Context: netif_addr_lock held, BHs disabled. */
2229
static void efx_set_rx_mode(struct net_device *net_dev)
2230
{
2231
	struct efx_nic *efx = netdev_priv(net_dev);
2232

2233 2234 2235
	if (efx->port_enabled)
		queue_work(efx->workqueue, &efx->mac_work);
	/* Otherwise efx_start_port() will do this */
2236 2237
}

2238
static int efx_set_features(struct net_device *net_dev, netdev_features_t data)
2239 2240 2241 2242 2243
{
	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)
2244
		return efx->type->filter_clear_rx(efx, EFX_FILTER_PRI_MANUAL);
2245 2246 2247 2248

	return 0;
}

2249
static const struct net_device_ops efx_netdev_ops = {
S
Stephen Hemminger 已提交
2250 2251
	.ndo_open		= efx_net_open,
	.ndo_stop		= efx_net_stop,
2252
	.ndo_get_stats64	= efx_net_stats,
S
Stephen Hemminger 已提交
2253 2254 2255 2256 2257 2258
	.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,
2259
	.ndo_set_rx_mode	= efx_set_rx_mode,
2260
	.ndo_set_features	= efx_set_features,
2261
#ifdef CONFIG_SFC_SRIOV
2262 2263 2264 2265
	.ndo_set_vf_mac		= efx_sriov_set_vf_mac,
	.ndo_set_vf_vlan	= efx_sriov_set_vf_vlan,
	.ndo_set_vf_spoofchk	= efx_sriov_set_vf_spoofchk,
	.ndo_get_vf_config	= efx_sriov_get_vf_config,
2266
#endif
S
Stephen Hemminger 已提交
2267 2268 2269
#ifdef CONFIG_NET_POLL_CONTROLLER
	.ndo_poll_controller = efx_netpoll,
#endif
2270
	.ndo_setup_tc		= efx_setup_tc,
2271 2272 2273
#ifdef CONFIG_NET_RX_BUSY_POLL
	.ndo_busy_poll		= efx_busy_poll,
#endif
2274 2275 2276
#ifdef CONFIG_RFS_ACCEL
	.ndo_rx_flow_steer	= efx_filter_rfs,
#endif
S
Stephen Hemminger 已提交
2277 2278
};

2279 2280 2281 2282 2283 2284 2285
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);
}

2286 2287 2288
static int efx_netdev_event(struct notifier_block *this,
			    unsigned long event, void *ptr)
{
2289
	struct net_device *net_dev = netdev_notifier_info_to_dev(ptr);
2290

2291
	if ((net_dev->netdev_ops == &efx_netdev_ops) &&
2292 2293
	    event == NETDEV_CHANGENAME)
		efx_update_name(netdev_priv(net_dev));
2294 2295 2296 2297 2298 2299 2300 2301

	return NOTIFY_DONE;
}

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

B
Ben Hutchings 已提交
2302 2303 2304 2305 2306 2307
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);
}
2308
static DEVICE_ATTR(phy_type, 0444, show_phy_type, NULL);
B
Ben Hutchings 已提交
2309

2310 2311 2312
static int efx_register_netdev(struct efx_nic *efx)
{
	struct net_device *net_dev = efx->net_dev;
2313
	struct efx_channel *channel;
2314 2315 2316 2317
	int rc;

	net_dev->watchdog_timeo = 5 * HZ;
	net_dev->irq = efx->pci_dev->irq;
2318 2319
	net_dev->netdev_ops = &efx_netdev_ops;
	if (efx_nic_rev(efx) >= EFX_REV_HUNT_A0)
2320
		net_dev->priv_flags |= IFF_UNICAST_FLT;
2321
	net_dev->ethtool_ops = &efx_ethtool_ops;
2322
	net_dev->gso_max_segs = EFX_TSO_MAX_SEGS;
2323

2324
	rtnl_lock();
2325

2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338
	/* Enable resets to be scheduled and check whether any were
	 * already requested.  If so, the NIC is probably hosed so we
	 * abort.
	 */
	efx->state = STATE_READY;
	smp_mb(); /* ensure we change state before checking reset_pending */
	if (efx->reset_pending) {
		netif_err(efx, probe, efx->net_dev,
			  "aborting probe due to scheduled reset\n");
		rc = -EIO;
		goto fail_locked;
	}

2339 2340 2341
	rc = dev_alloc_name(net_dev, net_dev->name);
	if (rc < 0)
		goto fail_locked;
2342
	efx_update_name(efx);
2343

2344 2345 2346
	/* Always start with carrier off; PHY events will detect the link */
	netif_carrier_off(net_dev);

2347 2348 2349 2350
	rc = register_netdevice(net_dev);
	if (rc)
		goto fail_locked;

2351 2352
	efx_for_each_channel(channel, efx) {
		struct efx_tx_queue *tx_queue;
2353 2354
		efx_for_each_channel_tx_queue(tx_queue, channel)
			efx_init_tx_queue_core_txq(tx_queue);
2355 2356
	}

2357 2358
	efx_associate(efx);

2359
	rtnl_unlock();
2360

B
Ben Hutchings 已提交
2361 2362
	rc = device_create_file(&efx->pci_dev->dev, &dev_attr_phy_type);
	if (rc) {
2363 2364
		netif_err(efx, drv, efx->net_dev,
			  "failed to init net dev attributes\n");
B
Ben Hutchings 已提交
2365 2366 2367
		goto fail_registered;
	}

2368
	return 0;
B
Ben Hutchings 已提交
2369

2370 2371
fail_registered:
	rtnl_lock();
2372
	efx_dissociate(efx);
2373
	unregister_netdevice(net_dev);
2374
fail_locked:
2375
	efx->state = STATE_UNINIT;
2376
	rtnl_unlock();
2377
	netif_err(efx, drv, efx->net_dev, "could not register net dev\n");
2378
	return rc;
2379 2380 2381 2382 2383 2384 2385
}

static void efx_unregister_netdev(struct efx_nic *efx)
{
	if (!efx->net_dev)
		return;

2386
	BUG_ON(netdev_priv(efx->net_dev) != efx);
2387

2388 2389
	strlcpy(efx->name, pci_name(efx->pci_dev), sizeof(efx->name));
	device_remove_file(&efx->pci_dev->dev, &dev_attr_phy_type);
2390 2391 2392 2393 2394

	rtnl_lock();
	unregister_netdevice(efx->net_dev);
	efx->state = STATE_UNINIT;
	rtnl_unlock();
2395 2396 2397 2398 2399 2400 2401 2402
}

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

B
Ben Hutchings 已提交
2403 2404
/* Tears down the entire software state and most of the hardware state
 * before reset.  */
B
Ben Hutchings 已提交
2405
void efx_reset_down(struct efx_nic *efx, enum reset_type method)
2406 2407 2408
{
	EFX_ASSERT_RESET_SERIALISED(efx);

2409 2410 2411
	if (method == RESET_TYPE_MCDI_TIMEOUT)
		efx->type->prepare_flr(efx);

B
Ben Hutchings 已提交
2412
	efx_stop_all(efx);
B
Ben Hutchings 已提交
2413
	efx_disable_interrupts(efx);
2414 2415

	mutex_lock(&efx->mac_lock);
2416 2417
	if (efx->port_initialized && method != RESET_TYPE_INVISIBLE)
		efx->phy_op->fini(efx);
2418
	efx->type->fini(efx);
2419 2420
}

B
Ben Hutchings 已提交
2421 2422 2423 2424 2425
/* 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
2426
int efx_reset_up(struct efx_nic *efx, enum reset_type method, bool ok)
2427 2428 2429
{
	int rc;

B
Ben Hutchings 已提交
2430
	EFX_ASSERT_RESET_SERIALISED(efx);
2431

2432 2433 2434 2435
	if (method == RESET_TYPE_MCDI_TIMEOUT)
		efx->type->finish_flr(efx);

	/* Ensure that SRAM is initialised even if we're disabling the device */
2436
	rc = efx->type->init(efx);
2437
	if (rc) {
2438
		netif_err(efx, drv, efx->net_dev, "failed to initialise NIC\n");
2439
		goto fail;
2440 2441
	}

2442 2443 2444
	if (!ok)
		goto fail;

2445
	if (efx->port_initialized && method != RESET_TYPE_INVISIBLE) {
2446 2447 2448
		rc = efx->phy_op->init(efx);
		if (rc)
			goto fail;
2449 2450
		rc = efx->phy_op->reconfigure(efx);
		if (rc && rc != -EPERM)
2451 2452
			netif_err(efx, drv, efx->net_dev,
				  "could not restore PHY settings\n");
2453 2454
	}

2455 2456 2457
	rc = efx_enable_interrupts(efx);
	if (rc)
		goto fail;
2458 2459 2460 2461 2462 2463 2464 2465 2466

#ifdef CONFIG_SFC_SRIOV
	rc = efx->type->vswitching_restore(efx);
	if (rc) /* not fatal; the PF will still work fine */
		netif_warn(efx, probe, efx->net_dev,
			   "failed to restore vswitching rc=%d;"
			   " VFs may not function\n", rc);
#endif

B
Ben Hutchings 已提交
2467
	efx_restore_filters(efx);
2468 2469
	if (efx->type->sriov_reset)
		efx->type->sriov_reset(efx);
2470 2471 2472 2473 2474 2475 2476 2477 2478

	mutex_unlock(&efx->mac_lock);

	efx_start_all(efx);

	return 0;

fail:
	efx->port_initialized = false;
B
Ben Hutchings 已提交
2479 2480 2481

	mutex_unlock(&efx->mac_lock);

2482 2483 2484
	return rc;
}

2485 2486
/* 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.
2487
 *
2488
 * Caller must hold the rtnl_lock.
2489
 */
2490
int efx_reset(struct efx_nic *efx, enum reset_type method)
2491
{
2492 2493
	int rc, rc2;
	bool disabled;
2494

2495 2496
	netif_info(efx, drv, efx->net_dev, "resetting (%s)\n",
		   RESET_TYPE(method));
2497

2498
	efx_device_detach_sync(efx);
B
Ben Hutchings 已提交
2499
	efx_reset_down(efx, method);
2500

2501
	rc = efx->type->reset(efx, method);
2502
	if (rc) {
2503
		netif_err(efx, drv, efx->net_dev, "failed to reset hardware\n");
2504
		goto out;
2505 2506
	}

2507 2508 2509
	/* Clear flags for the scopes we covered.  We assume the NIC and
	 * driver are now quiescent so that there is no race here.
	 */
2510 2511 2512 2513
	if (method < RESET_TYPE_MAX_METHOD)
		efx->reset_pending &= -(1 << (method + 1));
	else /* it doesn't fit into the well-ordered scope hierarchy */
		__clear_bit(method, &efx->reset_pending);
2514 2515 2516 2517 2518 2519 2520

	/* 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);

2521
out:
2522
	/* Leave device stopped if necessary */
2523 2524 2525
	disabled = rc ||
		method == RESET_TYPE_DISABLE ||
		method == RESET_TYPE_RECOVER_OR_DISABLE;
2526 2527 2528 2529 2530
	rc2 = efx_reset_up(efx, method, !disabled);
	if (rc2) {
		disabled = true;
		if (!rc)
			rc = rc2;
2531 2532
	}

2533
	if (disabled) {
2534
		dev_close(efx->net_dev);
2535
		netif_err(efx, drv, efx->net_dev, "has been disabled\n");
2536 2537
		efx->state = STATE_DISABLED;
	} else {
2538
		netif_dbg(efx, drv, efx->net_dev, "reset complete\n");
2539
		netif_device_attach(efx->net_dev);
2540
	}
2541 2542 2543
	return rc;
}

2544 2545 2546 2547 2548
/* Try recovery mechanisms.
 * For now only EEH is supported.
 * Returns 0 if the recovery mechanisms are unsuccessful.
 * Returns a non-zero value otherwise.
 */
2549
int efx_try_recovery(struct efx_nic *efx)
2550 2551 2552 2553 2554 2555 2556
{
#ifdef CONFIG_EEH
	/* A PCI error can occur and not be seen by EEH because nothing
	 * happens on the PCI bus. In this case the driver may fail and
	 * schedule a 'recover or reset', leading to this recovery handler.
	 * Manually call the eeh failure check function.
	 */
2557
	struct eeh_dev *eehdev = pci_dev_to_eeh_dev(efx->pci_dev);
2558 2559 2560 2561 2562 2563 2564 2565 2566 2567
	if (eeh_dev_check_failure(eehdev)) {
		/* The EEH mechanisms will handle the error and reset the
		 * device if necessary.
		 */
		return 1;
	}
#endif
	return 0;
}

2568 2569 2570 2571 2572 2573 2574 2575 2576 2577 2578 2579 2580 2581 2582 2583 2584 2585
static void efx_wait_for_bist_end(struct efx_nic *efx)
{
	int i;

	for (i = 0; i < BIST_WAIT_DELAY_COUNT; ++i) {
		if (efx_mcdi_poll_reboot(efx))
			goto out;
		msleep(BIST_WAIT_DELAY_MS);
	}

	netif_err(efx, drv, efx->net_dev, "Warning: No MC reboot after BIST mode\n");
out:
	/* Either way unset the BIST flag. If we found no reboot we probably
	 * won't recover, but we should try.
	 */
	efx->mc_bist_for_other_fn = false;
}

2586 2587 2588 2589 2590
/* 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)
{
2591
	struct efx_nic *efx = container_of(data, struct efx_nic, reset_work);
2592 2593 2594 2595 2596 2597
	unsigned long pending;
	enum reset_type method;

	pending = ACCESS_ONCE(efx->reset_pending);
	method = fls(pending) - 1;

2598 2599 2600
	if (method == RESET_TYPE_MC_BIST)
		efx_wait_for_bist_end(efx);

2601 2602 2603 2604
	if ((method == RESET_TYPE_RECOVER_OR_DISABLE ||
	     method == RESET_TYPE_RECOVER_OR_ALL) &&
	    efx_try_recovery(efx))
		return;
2605

2606
	if (!pending)
2607 2608
		return;

2609
	rtnl_lock();
2610 2611 2612 2613 2614 2615

	/* We checked the state in efx_schedule_reset() but it may
	 * have changed by now.  Now that we have the RTNL lock,
	 * it cannot change again.
	 */
	if (efx->state == STATE_READY)
2616
		(void)efx_reset(efx, method);
2617

2618
	rtnl_unlock();
2619 2620 2621 2622 2623 2624
}

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

2625 2626 2627 2628 2629 2630 2631
	if (efx->state == STATE_RECOVERY) {
		netif_dbg(efx, drv, efx->net_dev,
			  "recovering: skip scheduling %s reset\n",
			  RESET_TYPE(type));
		return;
	}

2632 2633 2634
	switch (type) {
	case RESET_TYPE_INVISIBLE:
	case RESET_TYPE_ALL:
2635
	case RESET_TYPE_RECOVER_OR_ALL:
2636 2637
	case RESET_TYPE_WORLD:
	case RESET_TYPE_DISABLE:
2638
	case RESET_TYPE_RECOVER_OR_DISABLE:
2639
	case RESET_TYPE_MC_BIST:
2640
	case RESET_TYPE_MCDI_TIMEOUT:
2641
		method = type;
2642 2643
		netif_dbg(efx, drv, efx->net_dev, "scheduling %s reset\n",
			  RESET_TYPE(method));
2644 2645
		break;
	default:
2646
		method = efx->type->map_reset_reason(type);
2647 2648 2649
		netif_dbg(efx, drv, efx->net_dev,
			  "scheduling %s reset for %s\n",
			  RESET_TYPE(method), RESET_TYPE(type));
2650 2651
		break;
	}
2652

2653
	set_bit(method, &efx->reset_pending);
2654 2655 2656 2657 2658 2659 2660
	smp_mb(); /* ensure we change reset_pending before checking state */

	/* If we're not READY then just leave the flags set as the cue
	 * to abort probing or reschedule the reset later.
	 */
	if (ACCESS_ONCE(efx->state) != STATE_READY)
		return;
2661

2662 2663 2664 2665
	/* 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);

2666
	queue_work(reset_workqueue, &efx->reset_work);
2667 2668 2669 2670 2671 2672 2673 2674 2675
}

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

/* PCI device ID table */
2676
static const struct pci_device_id efx_pci_table[] = {
2677 2678
	{PCI_DEVICE(PCI_VENDOR_ID_SOLARFLARE,
		    PCI_DEVICE_ID_SOLARFLARE_SFC4000A_0),
2679
	 .driver_data = (unsigned long) &falcon_a1_nic_type},
2680 2681
	{PCI_DEVICE(PCI_VENDOR_ID_SOLARFLARE,
		    PCI_DEVICE_ID_SOLARFLARE_SFC4000B),
2682
	 .driver_data = (unsigned long) &falcon_b0_nic_type},
2683
	{PCI_DEVICE(PCI_VENDOR_ID_SOLARFLARE, 0x0803),	/* SFC9020 */
2684
	 .driver_data = (unsigned long) &siena_a0_nic_type},
2685
	{PCI_DEVICE(PCI_VENDOR_ID_SOLARFLARE, 0x0813),	/* SFL9021 */
2686
	 .driver_data = (unsigned long) &siena_a0_nic_type},
2687 2688
	{PCI_DEVICE(PCI_VENDOR_ID_SOLARFLARE, 0x0903),  /* SFC9120 PF */
	 .driver_data = (unsigned long) &efx_hunt_a0_nic_type},
2689 2690
	{PCI_DEVICE(PCI_VENDOR_ID_SOLARFLARE, 0x1903),  /* SFC9120 VF */
	 .driver_data = (unsigned long) &efx_hunt_a0_vf_nic_type},
2691 2692
	{PCI_DEVICE(PCI_VENDOR_ID_SOLARFLARE, 0x0923),  /* SFC9140 PF */
	 .driver_data = (unsigned long) &efx_hunt_a0_nic_type},
2693 2694 2695 2696 2697
	{0}			/* end of list */
};

/**************************************************************************
 *
2698
 * Dummy PHY/MAC operations
2699
 *
2700
 * Can be used for some unimplemented operations
2701 2702 2703 2704 2705 2706 2707 2708 2709
 * 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
2710 2711

static bool efx_port_dummy_op_poll(struct efx_nic *efx)
S
Steve Hodgson 已提交
2712 2713 2714
{
	return false;
}
2715

2716
static const struct efx_phy_operations efx_dummy_phy_operations = {
2717
	.init		 = efx_port_dummy_op_int,
B
Ben Hutchings 已提交
2718
	.reconfigure	 = efx_port_dummy_op_int,
S
Steve Hodgson 已提交
2719
	.poll		 = efx_port_dummy_op_poll,
2720 2721 2722 2723 2724 2725 2726 2727 2728 2729 2730 2731
	.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).
 */
2732
static int efx_init_struct(struct efx_nic *efx,
2733 2734
			   struct pci_dev *pci_dev, struct net_device *net_dev)
{
2735
	int i;
2736 2737

	/* Initialise common structures */
2738 2739
	INIT_LIST_HEAD(&efx->node);
	INIT_LIST_HEAD(&efx->secondary_list);
2740
	spin_lock_init(&efx->biu_lock);
2741 2742 2743
#ifdef CONFIG_SFC_MTD
	INIT_LIST_HEAD(&efx->mtd_list);
#endif
2744 2745
	INIT_WORK(&efx->reset_work, efx_reset_work);
	INIT_DELAYED_WORK(&efx->monitor_work, efx_monitor);
2746
	INIT_DELAYED_WORK(&efx->selftest_work, efx_selftest_async_work);
2747
	efx->pci_dev = pci_dev;
2748
	efx->msg_enable = debug;
2749
	efx->state = STATE_UNINIT;
2750 2751 2752
	strlcpy(efx->name, pci_name(pci_dev), sizeof(efx->name));

	efx->net_dev = net_dev;
2753
	efx->rx_prefix_size = efx->type->rx_prefix_size;
2754 2755
	efx->rx_ip_align =
		NET_IP_ALIGN ? (efx->rx_prefix_size + NET_IP_ALIGN) % 4 : 0;
2756 2757
	efx->rx_packet_hash_offset =
		efx->type->rx_hash_offset - efx->type->rx_prefix_size;
2758 2759
	efx->rx_packet_ts_offset =
		efx->type->rx_ts_offset - efx->type->rx_prefix_size;
2760 2761 2762
	spin_lock_init(&efx->stats_lock);
	mutex_init(&efx->mac_lock);
	efx->phy_op = &efx_dummy_phy_operations;
2763
	efx->mdio.dev = net_dev;
2764
	INIT_WORK(&efx->mac_work, efx_mac_work);
2765
	init_waitqueue_head(&efx->flush_wq);
2766 2767

	for (i = 0; i < EFX_MAX_CHANNELS; i++) {
2768 2769 2770
		efx->channel[i] = efx_alloc_channel(efx, i, NULL);
		if (!efx->channel[i])
			goto fail;
B
Ben Hutchings 已提交
2771 2772
		efx->msi_context[i].efx = efx;
		efx->msi_context[i].index = i;
2773 2774 2775 2776 2777 2778
	}

	/* Higher numbered interrupt modes are less capable! */
	efx->interrupt_mode = max(efx->type->max_interrupt_mode,
				  interrupt_mode);

2779 2780 2781 2782
	/* 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);
2783
	if (!efx->workqueue)
2784
		goto fail;
2785

2786
	return 0;
2787 2788 2789 2790

fail:
	efx_fini_struct(efx);
	return -ENOMEM;
2791 2792 2793 2794
}

static void efx_fini_struct(struct efx_nic *efx)
{
2795 2796 2797 2798 2799
	int i;

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

2800 2801
	kfree(efx->vpd_sn);

2802 2803 2804 2805 2806 2807
	if (efx->workqueue) {
		destroy_workqueue(efx->workqueue);
		efx->workqueue = NULL;
	}
}

2808 2809 2810 2811 2812 2813 2814 2815 2816 2817 2818
void efx_update_sw_stats(struct efx_nic *efx, u64 *stats)
{
	u64 n_rx_nodesc_trunc = 0;
	struct efx_channel *channel;

	efx_for_each_channel(channel, efx)
		n_rx_nodesc_trunc += channel->n_rx_nodesc_trunc;
	stats[GENERIC_STAT_rx_nodesc_trunc] = n_rx_nodesc_trunc;
	stats[GENERIC_STAT_rx_noskb_drops] = atomic_read(&efx->n_rx_noskb_drops);
}

2819 2820 2821 2822 2823 2824 2825 2826 2827 2828 2829
/**************************************************************************
 *
 * 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)
{
2830 2831 2832 2833 2834 2835
	/* Flush reset_work. It can no longer be scheduled since we
	 * are not READY.
	 */
	BUG_ON(efx->state == STATE_READY);
	cancel_work_sync(&efx->reset_work);

B
Ben Hutchings 已提交
2836
	efx_disable_interrupts(efx);
2837
	efx_nic_fini_interrupt(efx);
2838
	efx_fini_port(efx);
2839
	efx->type->fini(efx);
2840 2841 2842 2843 2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854 2855 2856
	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();
2857
	efx_dissociate(efx);
2858
	dev_close(efx->net_dev);
B
Ben Hutchings 已提交
2859
	efx_disable_interrupts(efx);
2860 2861
	rtnl_unlock();

2862 2863 2864
	if (efx->type->sriov_fini)
		efx->type->sriov_fini(efx);

2865 2866
	efx_unregister_netdev(efx);

2867 2868
	efx_mtd_remove(efx);

2869 2870 2871
	efx_pci_remove_main(efx);

	efx_fini_io(efx);
2872
	netif_dbg(efx, drv, efx->net_dev, "shutdown successful\n");
2873 2874 2875

	efx_fini_struct(efx);
	free_netdev(efx->net_dev);
2876 2877

	pci_disable_pcie_error_reporting(pci_dev);
2878 2879
};

2880 2881 2882 2883 2884 2885
/* NIC VPD information
 * Called during probe to display the part number of the
 * installed NIC.  VPD is potentially very large but this should
 * always appear within the first 512 bytes.
 */
#define SFC_VPD_LEN 512
2886
static void efx_probe_vpd_strings(struct efx_nic *efx)
2887 2888 2889 2890
{
	struct pci_dev *dev = efx->pci_dev;
	char vpd_data[SFC_VPD_LEN];
	ssize_t vpd_size;
2891
	int ro_start, ro_size, i, j;
2892 2893 2894 2895 2896 2897 2898 2899 2900

	/* Get the vpd data from the device */
	vpd_size = pci_read_vpd(dev, 0, sizeof(vpd_data), vpd_data);
	if (vpd_size <= 0) {
		netif_err(efx, drv, efx->net_dev, "Unable to read VPD\n");
		return;
	}

	/* Get the Read only section */
2901 2902
	ro_start = pci_vpd_find_tag(vpd_data, 0, vpd_size, PCI_VPD_LRDT_RO_DATA);
	if (ro_start < 0) {
2903 2904 2905 2906
		netif_err(efx, drv, efx->net_dev, "VPD Read-only not found\n");
		return;
	}

2907 2908 2909
	ro_size = pci_vpd_lrdt_size(&vpd_data[ro_start]);
	j = ro_size;
	i = ro_start + PCI_VPD_LRDT_TAG_SIZE;
2910 2911 2912 2913 2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925 2926 2927 2928
	if (i + j > vpd_size)
		j = vpd_size - i;

	/* Get the Part number */
	i = pci_vpd_find_info_keyword(vpd_data, i, j, "PN");
	if (i < 0) {
		netif_err(efx, drv, efx->net_dev, "Part number not found\n");
		return;
	}

	j = pci_vpd_info_field_size(&vpd_data[i]);
	i += PCI_VPD_INFO_FLD_HDR_SIZE;
	if (i + j > vpd_size) {
		netif_err(efx, drv, efx->net_dev, "Incomplete part number\n");
		return;
	}

	netif_info(efx, drv, efx->net_dev,
		   "Part Number : %.*s\n", j, &vpd_data[i]);
2929 2930 2931 2932 2933 2934 2935 2936 2937 2938 2939 2940 2941 2942 2943 2944 2945 2946 2947 2948 2949

	i = ro_start + PCI_VPD_LRDT_TAG_SIZE;
	j = ro_size;
	i = pci_vpd_find_info_keyword(vpd_data, i, j, "SN");
	if (i < 0) {
		netif_err(efx, drv, efx->net_dev, "Serial number not found\n");
		return;
	}

	j = pci_vpd_info_field_size(&vpd_data[i]);
	i += PCI_VPD_INFO_FLD_HDR_SIZE;
	if (i + j > vpd_size) {
		netif_err(efx, drv, efx->net_dev, "Incomplete serial number\n");
		return;
	}

	efx->vpd_sn = kmalloc(j + 1, GFP_KERNEL);
	if (!efx->vpd_sn)
		return;

	snprintf(efx->vpd_sn, j + 1, "%s", &vpd_data[i]);
2950 2951 2952
}


2953 2954 2955 2956 2957 2958 2959 2960 2961 2962 2963 2964
/* 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;

2965
	efx_init_napi(efx);
2966

2967
	rc = efx->type->init(efx);
2968
	if (rc) {
2969 2970
		netif_err(efx, probe, efx->net_dev,
			  "failed to initialise NIC\n");
2971
		goto fail3;
2972 2973 2974 2975
	}

	rc = efx_init_port(efx);
	if (rc) {
2976 2977
		netif_err(efx, probe, efx->net_dev,
			  "failed to initialise port\n");
2978
		goto fail4;
2979 2980
	}

2981
	rc = efx_nic_init_interrupt(efx);
2982
	if (rc)
2983
		goto fail5;
2984 2985 2986
	rc = efx_enable_interrupts(efx);
	if (rc)
		goto fail6;
2987 2988 2989

	return 0;

2990 2991
 fail6:
	efx_nic_fini_interrupt(efx);
2992
 fail5:
2993 2994
	efx_fini_port(efx);
 fail4:
2995
	efx->type->fini(efx);
2996 2997 2998 2999 3000 3001 3002 3003 3004 3005
 fail3:
	efx_fini_napi(efx);
	efx_remove_all(efx);
 fail1:
	return rc;
}

/* NIC initialisation
 *
 * This is called at module load (or hotplug insertion,
3006
 * theoretically).  It sets up PCI mappings, resets the NIC,
3007 3008 3009 3010 3011
 * 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).
 */
B
Bill Pemberton 已提交
3012
static int efx_pci_probe(struct pci_dev *pci_dev,
3013
			 const struct pci_device_id *entry)
3014 3015 3016
{
	struct net_device *net_dev;
	struct efx_nic *efx;
3017
	int rc;
3018 3019

	/* Allocate and initialise a struct net_device and struct efx_nic */
3020 3021
	net_dev = alloc_etherdev_mqs(sizeof(*efx), EFX_MAX_CORE_TX_QUEUES,
				     EFX_MAX_RX_QUEUES);
3022 3023
	if (!net_dev)
		return -ENOMEM;
3024 3025 3026
	efx = netdev_priv(net_dev);
	efx->type = (const struct efx_nic_type *) entry->driver_data;
	net_dev->features |= (efx->type->offload_features | NETIF_F_SG |
B
Ben Hutchings 已提交
3027
			      NETIF_F_HIGHDMA | NETIF_F_TSO |
3028
			      NETIF_F_RXCSUM);
3029
	if (efx->type->offload_features & NETIF_F_V6_CSUM)
B
Ben Hutchings 已提交
3030
		net_dev->features |= NETIF_F_TSO6;
3031 3032
	/* Mask for features that also apply to VLAN devices */
	net_dev->vlan_features |= (NETIF_F_ALL_CSUM | NETIF_F_SG |
3033 3034 3035 3036
				   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;
3037
	pci_set_drvdata(pci_dev, efx);
3038
	SET_NETDEV_DEV(net_dev, &pci_dev->dev);
3039
	rc = efx_init_struct(efx, pci_dev, net_dev);
3040 3041 3042
	if (rc)
		goto fail1;

3043
	netif_info(efx, probe, efx->net_dev,
3044
		   "Solarflare NIC detected\n");
3045

3046 3047
	if (!efx->type->is_vf)
		efx_probe_vpd_strings(efx);
3048

3049 3050 3051 3052 3053
	/* Set up basic I/O (BAR mappings etc) */
	rc = efx_init_io(efx);
	if (rc)
		goto fail2;

3054 3055 3056
	rc = efx_pci_probe_main(efx);
	if (rc)
		goto fail3;
3057 3058 3059

	rc = efx_register_netdev(efx);
	if (rc)
3060
		goto fail4;
3061

3062 3063 3064 3065 3066 3067
	if (efx->type->sriov_init) {
		rc = efx->type->sriov_init(efx);
		if (rc)
			netif_err(efx, probe, efx->net_dev,
				  "SR-IOV can't be enabled rc %d\n", rc);
	}
3068

3069
	netif_dbg(efx, probe, efx->net_dev, "initialisation successful\n");
3070

3071
	/* Try to create MTDs, but allow this to fail */
3072
	rtnl_lock();
3073
	rc = efx_mtd_probe(efx);
3074
	rtnl_unlock();
3075 3076 3077 3078
	if (rc)
		netif_warn(efx, probe, efx->net_dev,
			   "failed to create MTDs (%d)\n", rc);

3079 3080 3081 3082 3083
	rc = pci_enable_pcie_error_reporting(pci_dev);
	if (rc && rc != -EINVAL)
		netif_warn(efx, probe, efx->net_dev,
			   "pci_enable_pcie_error_reporting failed (%d)\n", rc);

3084 3085 3086
	return 0;

 fail4:
3087
	efx_pci_remove_main(efx);
3088 3089 3090 3091 3092
 fail3:
	efx_fini_io(efx);
 fail2:
	efx_fini_struct(efx);
 fail1:
S
Steve Hodgson 已提交
3093
	WARN_ON(rc > 0);
3094
	netif_dbg(efx, drv, efx->net_dev, "initialisation failed. rc=%d\n", rc);
3095 3096 3097 3098
	free_netdev(net_dev);
	return rc;
}

3099 3100 3101 3102 3103 3104 3105 3106 3107 3108 3109 3110 3111 3112 3113 3114 3115 3116 3117 3118
/* efx_pci_sriov_configure returns the actual number of Virtual Functions
 * enabled on success
 */
#ifdef CONFIG_SFC_SRIOV
static int efx_pci_sriov_configure(struct pci_dev *dev, int num_vfs)
{
	int rc;
	struct efx_nic *efx = pci_get_drvdata(dev);

	if (efx->type->sriov_configure) {
		rc = efx->type->sriov_configure(efx, num_vfs);
		if (rc)
			return rc;
		else
			return num_vfs;
	} else
		return -EOPNOTSUPP;
}
#endif

3119 3120 3121 3122
static int efx_pm_freeze(struct device *dev)
{
	struct efx_nic *efx = pci_get_drvdata(to_pci_dev(dev));

3123 3124
	rtnl_lock();

3125 3126
	if (efx->state != STATE_DISABLED) {
		efx->state = STATE_UNINIT;
3127

3128
		efx_device_detach_sync(efx);
3129

3130
		efx_stop_all(efx);
B
Ben Hutchings 已提交
3131
		efx_disable_interrupts(efx);
3132
	}
3133

3134 3135
	rtnl_unlock();

3136 3137 3138 3139 3140
	return 0;
}

static int efx_pm_thaw(struct device *dev)
{
3141
	int rc;
3142 3143
	struct efx_nic *efx = pci_get_drvdata(to_pci_dev(dev));

3144 3145
	rtnl_lock();

3146
	if (efx->state != STATE_DISABLED) {
3147 3148 3149
		rc = efx_enable_interrupts(efx);
		if (rc)
			goto fail;
3150

3151 3152 3153
		mutex_lock(&efx->mac_lock);
		efx->phy_op->reconfigure(efx);
		mutex_unlock(&efx->mac_lock);
3154

3155
		efx_start_all(efx);
3156

3157
		netif_device_attach(efx->net_dev);
3158

3159
		efx->state = STATE_READY;
3160

3161 3162
		efx->type->resume_wol(efx);
	}
3163

3164 3165
	rtnl_unlock();

3166 3167 3168
	/* Reschedule any quenched resets scheduled during efx_pm_freeze() */
	queue_work(reset_workqueue, &efx->reset_work);

3169
	return 0;
3170 3171 3172 3173 3174

fail:
	rtnl_unlock();

	return rc;
3175 3176 3177 3178 3179 3180 3181 3182 3183
}

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);

3184
	efx->reset_pending = 0;
3185 3186 3187 3188 3189 3190 3191 3192 3193 3194 3195 3196 3197 3198 3199 3200 3201 3202 3203 3204 3205 3206 3207 3208 3209 3210

	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;
3211 3212
	rc = efx_pm_thaw(dev);
	return rc;
3213 3214 3215 3216 3217 3218 3219 3220 3221 3222 3223 3224 3225
}

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;
}

3226
static const struct dev_pm_ops efx_pm_ops = {
3227 3228 3229 3230 3231 3232 3233 3234
	.suspend	= efx_pm_suspend,
	.resume		= efx_pm_resume,
	.freeze		= efx_pm_freeze,
	.thaw		= efx_pm_thaw,
	.poweroff	= efx_pm_poweroff,
	.restore	= efx_pm_resume,
};

3235 3236 3237 3238
/* A PCI error affecting this device was detected.
 * At this point MMIO and DMA may be disabled.
 * Stop the software path and request a slot reset.
 */
3239 3240
static pci_ers_result_t efx_io_error_detected(struct pci_dev *pdev,
					      enum pci_channel_state state)
3241 3242 3243 3244 3245 3246 3247 3248 3249 3250 3251 3252 3253 3254 3255 3256
{
	pci_ers_result_t status = PCI_ERS_RESULT_RECOVERED;
	struct efx_nic *efx = pci_get_drvdata(pdev);

	if (state == pci_channel_io_perm_failure)
		return PCI_ERS_RESULT_DISCONNECT;

	rtnl_lock();

	if (efx->state != STATE_DISABLED) {
		efx->state = STATE_RECOVERY;
		efx->reset_pending = 0;

		efx_device_detach_sync(efx);

		efx_stop_all(efx);
B
Ben Hutchings 已提交
3257
		efx_disable_interrupts(efx);
3258 3259 3260 3261 3262 3263 3264 3265 3266 3267 3268 3269 3270 3271 3272 3273

		status = PCI_ERS_RESULT_NEED_RESET;
	} else {
		/* If the interface is disabled we don't want to do anything
		 * with it.
		 */
		status = PCI_ERS_RESULT_RECOVERED;
	}

	rtnl_unlock();

	pci_disable_device(pdev);

	return status;
}

3274
/* Fake a successful reset, which will be performed later in efx_io_resume. */
3275
static pci_ers_result_t efx_io_slot_reset(struct pci_dev *pdev)
3276 3277 3278 3279 3280 3281 3282 3283 3284 3285 3286 3287 3288 3289 3290 3291 3292 3293 3294 3295 3296 3297 3298 3299 3300 3301 3302 3303 3304 3305 3306 3307 3308 3309 3310 3311 3312 3313 3314 3315 3316 3317 3318 3319 3320 3321 3322 3323 3324 3325 3326 3327 3328 3329 3330 3331 3332 3333
{
	struct efx_nic *efx = pci_get_drvdata(pdev);
	pci_ers_result_t status = PCI_ERS_RESULT_RECOVERED;
	int rc;

	if (pci_enable_device(pdev)) {
		netif_err(efx, hw, efx->net_dev,
			  "Cannot re-enable PCI device after reset.\n");
		status =  PCI_ERS_RESULT_DISCONNECT;
	}

	rc = pci_cleanup_aer_uncorrect_error_status(pdev);
	if (rc) {
		netif_err(efx, hw, efx->net_dev,
		"pci_cleanup_aer_uncorrect_error_status failed (%d)\n", rc);
		/* Non-fatal error. Continue. */
	}

	return status;
}

/* Perform the actual reset and resume I/O operations. */
static void efx_io_resume(struct pci_dev *pdev)
{
	struct efx_nic *efx = pci_get_drvdata(pdev);
	int rc;

	rtnl_lock();

	if (efx->state == STATE_DISABLED)
		goto out;

	rc = efx_reset(efx, RESET_TYPE_ALL);
	if (rc) {
		netif_err(efx, hw, efx->net_dev,
			  "efx_reset failed after PCI error (%d)\n", rc);
	} else {
		efx->state = STATE_READY;
		netif_dbg(efx, hw, efx->net_dev,
			  "Done resetting and resuming IO after PCI error.\n");
	}

out:
	rtnl_unlock();
}

/* For simplicity and reliability, we always require a slot reset and try to
 * reset the hardware when a pci error affecting the device is detected.
 * We leave both the link_reset and mmio_enabled callback unimplemented:
 * with our request for slot reset the mmio_enabled callback will never be
 * called, and the link_reset callback is not used by AER or EEH mechanisms.
 */
static struct pci_error_handlers efx_err_handlers = {
	.error_detected = efx_io_error_detected,
	.slot_reset	= efx_io_slot_reset,
	.resume		= efx_io_resume,
};

3334
static struct pci_driver efx_pci_driver = {
3335
	.name		= KBUILD_MODNAME,
3336 3337 3338
	.id_table	= efx_pci_table,
	.probe		= efx_pci_probe,
	.remove		= efx_pci_remove,
3339
	.driver.pm	= &efx_pm_ops,
3340
	.err_handler	= &efx_err_handlers,
3341 3342 3343
#ifdef CONFIG_SFC_SRIOV
	.sriov_configure = efx_pci_sriov_configure,
#endif
3344 3345 3346 3347 3348 3349 3350 3351 3352 3353 3354 3355 3356 3357 3358 3359 3360 3361 3362 3363 3364 3365
};

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

3366
#ifdef CONFIG_SFC_SRIOV
3367 3368 3369
	rc = efx_init_sriov();
	if (rc)
		goto err_sriov;
3370
#endif
3371

3372 3373 3374 3375 3376
	reset_workqueue = create_singlethread_workqueue("sfc_reset");
	if (!reset_workqueue) {
		rc = -ENOMEM;
		goto err_reset;
	}
3377 3378 3379 3380 3381 3382 3383 3384

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

	return 0;

 err_pci:
3385 3386
	destroy_workqueue(reset_workqueue);
 err_reset:
3387
#ifdef CONFIG_SFC_SRIOV
3388 3389
	efx_fini_sriov();
 err_sriov:
3390
#endif
3391 3392 3393 3394 3395 3396 3397 3398 3399 3400
	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);
3401
	destroy_workqueue(reset_workqueue);
3402
#ifdef CONFIG_SFC_SRIOV
3403
	efx_fini_sriov();
3404
#endif
3405 3406 3407 3408 3409 3410 3411
	unregister_netdevice_notifier(&efx_netdev_notifier);

}

module_init(efx_init_module);
module_exit(efx_exit_module);

3412 3413
MODULE_AUTHOR("Solarflare Communications and "
	      "Michael Brown <mbrown@fensystems.co.uk>");
B
Ben Hutchings 已提交
3414
MODULE_DESCRIPTION("Solarflare network driver");
3415 3416
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, efx_pci_table);