efx.c 88.4 KB
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/****************************************************************************
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Ben Hutchings 已提交
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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_DATAPATH]           = "DATAPATH",
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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)
347
{
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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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Ben Hutchings 已提交
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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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{
589
	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.
	 */
599
	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);
	}

621 622 623 624 625 626 627 628 629 630 631
	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);
632

J
Jon Cooper 已提交
633
	/* RX filters may also have scatter-enabled flags */
634
	if (efx->rx_scatter != old_rx_scatter)
635
		efx->type->filter_update_rx_scatter(efx);
636

637 638 639 640 641 642 643 644 645 646
	/* 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;

647 648
	/* Initialise the channels */
	efx_for_each_channel(channel, efx) {
649
		efx_for_each_channel_tx_queue(tx_queue, channel) {
650
			efx_init_tx_queue(tx_queue);
651 652
			atomic_inc(&efx->active_queues);
		}
653

654
		efx_for_each_channel_rx_queue(rx_queue, channel) {
655
			efx_init_rx_queue(rx_queue);
656
			atomic_inc(&efx->active_queues);
657 658 659
			efx_stop_eventq(channel);
			efx_fast_push_rx_descriptors(rx_queue, false);
			efx_start_eventq(channel);
660
		}
661

662
		WARN_ON(channel->rx_pkt_n_frags);
663 664
	}

665 666
	efx_ptp_start_datapath(efx);

667 668
	if (netif_device_present(efx->net_dev))
		netif_tx_wake_all_queues(efx->net_dev);
669 670
}

671
static void efx_stop_datapath(struct efx_nic *efx)
672 673 674 675
{
	struct efx_channel *channel;
	struct efx_tx_queue *tx_queue;
	struct efx_rx_queue *rx_queue;
676
	int rc;
677 678 679 680

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

681 682
	efx_ptp_stop_datapath(efx);

683 684 685 686 687 688
	/* Stop RX refill */
	efx_for_each_channel(channel, efx) {
		efx_for_each_channel_rx_queue(rx_queue, channel)
			rx_queue->refill_enabled = false;
	}

689
	efx_for_each_channel(channel, efx) {
690 691 692 693 694 695 696 697 698 699
		/* 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);
		}
700
	}
701

702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719
	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) {
720 721
		efx_for_each_channel_rx_queue(rx_queue, channel)
			efx_fini_rx_queue(rx_queue);
722
		efx_for_each_possible_channel_tx_queue(tx_queue, channel)
723 724 725 726 727 728 729 730 731
			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;

732 733
	netif_dbg(channel->efx, drv, channel->efx->net_dev,
		  "destroy chan %d\n", channel->channel);
734 735 736

	efx_for_each_channel_rx_queue(rx_queue, channel)
		efx_remove_rx_queue(rx_queue);
737
	efx_for_each_possible_channel_tx_queue(tx_queue, channel)
738 739
		efx_remove_tx_queue(tx_queue);
	efx_remove_eventq(channel);
740
	channel->type->post_remove(channel);
741 742
}

743 744 745 746 747 748 749 750 751 752 753 754 755
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;
756
	unsigned i, next_buffer_table = 0;
757
	int rc, rc2;
758 759 760 761

	rc = efx_check_disabled(efx);
	if (rc)
		return rc;
762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783

	/* 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);
	}
784

785
	efx_device_detach_sync(efx);
786
	efx_stop_all(efx);
B
Ben Hutchings 已提交
787
	efx_soft_disable_interrupts(efx);
788

789
	/* Clone channels (where possible) */
790 791
	memset(other_channel, 0, sizeof(other_channel));
	for (i = 0; i < efx->n_channels; i++) {
792 793 794
		channel = efx->channel[i];
		if (channel->type->copy)
			channel = channel->type->copy(channel);
795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812
		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;
	}

813 814
	/* Restart buffer table allocation */
	efx->next_buffer_table = next_buffer_table;
815 816

	for (i = 0; i < efx->n_channels; i++) {
817 818 819 820 821 822 823
		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]);
824
	}
825

826
out:
827 828 829 830 831 832 833 834 835
	/* 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);
		}
	}
836

837 838 839 840 841 842 843 844 845 846
	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);
	}
847 848 849 850 851 852 853 854 855 856 857 858 859 860
	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;
}

861
void efx_schedule_slow_fill(struct efx_rx_queue *rx_queue)
862
{
863
	mod_timer(&rx_queue->slow_fill, jiffies + msecs_to_jiffies(100));
864 865
}

866 867
static const struct efx_channel_type efx_default_channel_type = {
	.pre_probe		= efx_channel_dummy_op_int,
868
	.post_remove		= efx_channel_dummy_op_void,
869 870 871 872 873 874 875 876 877 878
	.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;
}

879 880 881 882
void efx_channel_dummy_op_void(struct efx_channel *channel)
{
}

883 884 885 886 887 888 889 890 891 892
/**************************************************************************
 *
 * 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
893
void efx_link_status_changed(struct efx_nic *efx)
894
{
895 896
	struct efx_link_state *link_state = &efx->link_state;

897 898 899 900 901 902 903
	/* 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;

904
	if (link_state->up != netif_carrier_ok(efx->net_dev)) {
905 906
		efx->n_link_state_changes++;

907
		if (link_state->up)
908 909 910 911 912 913
			netif_carrier_on(efx->net_dev);
		else
			netif_carrier_off(efx->net_dev);
	}

	/* Status message for kernel log */
B
Ben Hutchings 已提交
914
	if (link_state->up)
915
		netif_info(efx, link, efx->net_dev,
916
			   "link up at %uMbps %s-duplex (MTU %d)\n",
917
			   link_state->speed, link_state->fd ? "full" : "half",
918
			   efx->net_dev->mtu);
B
Ben Hutchings 已提交
919
	else
920
		netif_info(efx, link, efx->net_dev, "link down\n");
921 922
}

B
Ben Hutchings 已提交
923 924 925 926 927 928 929 930 931 932 933 934 935
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;
	}
}

936
void efx_link_set_wanted_fc(struct efx_nic *efx, u8 wanted_fc)
B
Ben Hutchings 已提交
937 938 939 940 941 942 943 944 945 946 947 948 949 950
{
	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;
	}
}

951 952
static void efx_fini_port(struct efx_nic *efx);

953 954 955 956 957 958 959 960 961 962
/* We assume that efx->type->reconfigure_mac will always try to sync RX
 * filters and therefore needs to read-lock the filter table against freeing
 */
void efx_mac_reconfigure(struct efx_nic *efx)
{
	down_read(&efx->filter_sem);
	efx->type->reconfigure_mac(efx);
	up_read(&efx->filter_sem);
}

B
Ben Hutchings 已提交
963 964 965 966 967 968 969 970
/* 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)
971
{
B
Ben Hutchings 已提交
972 973
	enum efx_phy_mode phy_mode;
	int rc;
974

B
Ben Hutchings 已提交
975
	WARN_ON(!mutex_is_locked(&efx->mac_lock));
976

B
Ben Hutchings 已提交
977 978
	/* Disable PHY transmit in mac level loopbacks */
	phy_mode = efx->phy_mode;
979 980 981 982 983
	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
984
	rc = efx->type->reconfigure_port(efx);
985

B
Ben Hutchings 已提交
986 987
	if (rc)
		efx->phy_mode = phy_mode;
988

B
Ben Hutchings 已提交
989
	return rc;
990 991 992 993
}

/* Reinitialise the MAC to pick up new PHY settings, even if the port is
 * disabled. */
B
Ben Hutchings 已提交
994
int efx_reconfigure_port(struct efx_nic *efx)
995
{
B
Ben Hutchings 已提交
996 997
	int rc;

998 999 1000
	EFX_ASSERT_RESET_SERIALISED(efx);

	mutex_lock(&efx->mac_lock);
B
Ben Hutchings 已提交
1001
	rc = __efx_reconfigure_port(efx);
1002
	mutex_unlock(&efx->mac_lock);
B
Ben Hutchings 已提交
1003 1004

	return rc;
1005 1006
}

1007 1008 1009
/* Asynchronous work item for changing MAC promiscuity and multicast
 * hash.  Avoid a drain/rx_ingress enable by reconfiguring the current
 * MAC directly. */
1010 1011 1012 1013 1014
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);
1015
	if (efx->port_enabled)
1016
		efx_mac_reconfigure(efx);
1017 1018 1019
	mutex_unlock(&efx->mac_lock);
}

1020 1021 1022 1023
static int efx_probe_port(struct efx_nic *efx)
{
	int rc;

1024
	netif_dbg(efx, probe, efx->net_dev, "create port\n");
1025

1026 1027 1028
	if (phy_flash_cfg)
		efx->phy_mode = PHY_MODE_SPECIAL;

1029 1030
	/* Connect up MAC/PHY operations table */
	rc = efx->type->probe_port(efx);
1031
	if (rc)
1032
		return rc;
1033

1034
	/* Initialise MAC address to permanent address */
1035
	ether_addr_copy(efx->net_dev->dev_addr, efx->net_dev->perm_addr);
1036 1037 1038 1039 1040 1041 1042 1043

	return 0;
}

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

1044
	netif_dbg(efx, drv, efx->net_dev, "init port\n");
1045

1046 1047
	mutex_lock(&efx->mac_lock);

1048
	rc = efx->phy_op->init(efx);
1049
	if (rc)
1050
		goto fail1;
1051

1052
	efx->port_initialized = true;
1053

B
Ben Hutchings 已提交
1054 1055
	/* Reconfigure the MAC before creating dma queues (required for
	 * Falcon/A1 where RX_INGR_EN/TX_DRAIN_EN isn't supported) */
1056
	efx_mac_reconfigure(efx);
B
Ben Hutchings 已提交
1057 1058 1059

	/* Ensure the PHY advertises the correct flow control settings */
	rc = efx->phy_op->reconfigure(efx);
1060
	if (rc && rc != -EPERM)
B
Ben Hutchings 已提交
1061 1062
		goto fail2;

1063
	mutex_unlock(&efx->mac_lock);
1064
	return 0;
1065

1066
fail2:
1067
	efx->phy_op->fini(efx);
1068 1069
fail1:
	mutex_unlock(&efx->mac_lock);
1070
	return rc;
1071 1072 1073 1074
}

static void efx_start_port(struct efx_nic *efx)
{
1075
	netif_dbg(efx, ifup, efx->net_dev, "start port\n");
1076 1077 1078
	BUG_ON(efx->port_enabled);

	mutex_lock(&efx->mac_lock);
1079
	efx->port_enabled = true;
1080

1081
	/* Ensure MAC ingress/egress is enabled */
1082
	efx_mac_reconfigure(efx);
1083

1084 1085 1086
	mutex_unlock(&efx->mac_lock);
}

1087 1088 1089 1090 1091
/* 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.
 */
1092 1093
static void efx_stop_port(struct efx_nic *efx)
{
1094
	netif_dbg(efx, ifdown, efx->net_dev, "stop port\n");
1095

1096 1097
	EFX_ASSERT_RESET_SERIALISED(efx);

1098
	mutex_lock(&efx->mac_lock);
1099
	efx->port_enabled = false;
1100 1101 1102
	mutex_unlock(&efx->mac_lock);

	/* Serialise against efx_set_multicast_list() */
1103 1104
	netif_addr_lock_bh(efx->net_dev);
	netif_addr_unlock_bh(efx->net_dev);
1105 1106 1107 1108

	cancel_delayed_work_sync(&efx->monitor_work);
	efx_selftest_async_cancel(efx);
	cancel_work_sync(&efx->mac_work);
1109 1110 1111 1112
}

static void efx_fini_port(struct efx_nic *efx)
{
1113
	netif_dbg(efx, drv, efx->net_dev, "shut down port\n");
1114 1115 1116 1117

	if (!efx->port_initialized)
		return;

1118
	efx->phy_op->fini(efx);
1119
	efx->port_initialized = false;
1120

1121
	efx->link_state.up = false;
1122 1123 1124 1125 1126
	efx_link_status_changed(efx);
}

static void efx_remove_port(struct efx_nic *efx)
{
1127
	netif_dbg(efx, drv, efx->net_dev, "destroying port\n");
1128

1129
	efx->type->remove_port(efx);
1130 1131 1132 1133 1134 1135 1136 1137
}

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

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 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208
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;
	}
}

1209 1210 1211 1212 1213
/* 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;
1214
	unsigned int mem_map_size = efx->type->mem_map_size(efx);
1215
	int rc, bar;
1216

1217
	netif_dbg(efx, probe, efx->net_dev, "initialising I/O\n");
1218

1219 1220
	bar = efx->type->mem_bar;

1221 1222
	rc = pci_enable_device(pci_dev);
	if (rc) {
1223 1224
		netif_err(efx, probe, efx->net_dev,
			  "failed to enable PCI device\n");
1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235
		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) {
1236
		if (dma_supported(&pci_dev->dev, dma_mask)) {
1237
			rc = dma_set_mask_and_coherent(&pci_dev->dev, dma_mask);
1238 1239 1240
			if (rc == 0)
				break;
		}
1241 1242 1243
		dma_mask >>= 1;
	}
	if (rc) {
1244 1245
		netif_err(efx, probe, efx->net_dev,
			  "could not find a suitable DMA mask\n");
1246 1247
		goto fail2;
	}
1248 1249
	netif_dbg(efx, probe, efx->net_dev,
		  "using DMA mask %llx\n", (unsigned long long) dma_mask);
1250

1251 1252
	efx->membase_phys = pci_resource_start(efx->pci_dev, bar);
	rc = pci_request_region(pci_dev, bar, "sfc");
1253
	if (rc) {
1254 1255
		netif_err(efx, probe, efx->net_dev,
			  "request for memory BAR failed\n");
1256 1257 1258
		rc = -EIO;
		goto fail3;
	}
1259
	efx->membase = ioremap_nocache(efx->membase_phys, mem_map_size);
1260
	if (!efx->membase) {
1261 1262
		netif_err(efx, probe, efx->net_dev,
			  "could not map memory BAR at %llx+%x\n",
1263
			  (unsigned long long)efx->membase_phys, mem_map_size);
1264 1265 1266
		rc = -ENOMEM;
		goto fail4;
	}
1267 1268
	netif_dbg(efx, probe, efx->net_dev,
		  "memory BAR at %llx+%x (virtual %p)\n",
1269 1270
		  (unsigned long long)efx->membase_phys, mem_map_size,
		  efx->membase);
1271 1272 1273 1274

	return 0;

 fail4:
1275
	pci_release_region(efx->pci_dev, bar);
1276
 fail3:
1277
	efx->membase_phys = 0;
1278 1279 1280 1281 1282 1283 1284 1285
 fail2:
	pci_disable_device(efx->pci_dev);
 fail1:
	return rc;
}

static void efx_fini_io(struct efx_nic *efx)
{
1286 1287
	int bar;

1288
	netif_dbg(efx, drv, efx->net_dev, "shutting down I/O\n");
1289 1290 1291 1292 1293 1294 1295

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

	if (efx->membase_phys) {
1296 1297
		bar = efx->type->mem_bar;
		pci_release_region(efx->pci_dev, bar);
1298
		efx->membase_phys = 0;
1299 1300 1301 1302 1303
	}

	pci_disable_device(efx->pci_dev);
}

1304 1305 1306 1307 1308 1309 1310 1311 1312
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);
}

1313
static unsigned int efx_wanted_parallelism(struct efx_nic *efx)
1314
{
1315
	cpumask_var_t thread_mask;
1316
	unsigned int count;
1317
	int cpu;
1318

1319 1320 1321 1322 1323 1324 1325 1326
	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;
		}
1327

1328 1329 1330 1331 1332 1333 1334 1335 1336 1337
		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
1338 1339
	}

1340 1341 1342
	/* If RSS is requested for the PF *and* VFs then we can't write RSS
	 * table entries that are inaccessible to VFs
	 */
1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353
#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);
		}
1354
	}
1355
#endif
1356 1357 1358 1359 1360 1361 1362

	return count;
}

/* Probe the number and type of interrupts we are able to obtain, and
 * the resulting numbers of channels and RX queues.
 */
1363
static int efx_probe_interrupts(struct efx_nic *efx)
1364
{
1365 1366
	unsigned int extra_channels = 0;
	unsigned int i, j;
1367
	int rc;
1368

1369 1370 1371 1372
	for (i = 0; i < EFX_MAX_EXTRA_CHANNELS; i++)
		if (efx->extra_channel_type[i])
			++extra_channels;

1373
	if (efx->interrupt_mode == EFX_INT_MODE_MSIX) {
1374
		struct msix_entry xentries[EFX_MAX_CHANNELS];
1375
		unsigned int n_channels;
1376

1377
		n_channels = efx_wanted_parallelism(efx);
B
Ben Hutchings 已提交
1378 1379
		if (separate_tx_channels)
			n_channels *= 2;
1380
		n_channels += extra_channels;
1381
		n_channels = min(n_channels, efx->max_channels);
1382

B
Ben Hutchings 已提交
1383
		for (i = 0; i < n_channels; i++)
1384
			xentries[i].entry = i;
1385 1386 1387 1388 1389 1390 1391 1392
		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) {
1393 1394
			netif_err(efx, drv, efx->net_dev,
				  "WARNING: Insufficient MSI-X vectors"
1395
				  " available (%d < %u).\n", rc, n_channels);
1396 1397
			netif_err(efx, drv, efx->net_dev,
				  "WARNING: Performance may be reduced.\n");
B
Ben Hutchings 已提交
1398
			n_channels = rc;
1399 1400
		}

1401
		if (rc > 0) {
B
Ben Hutchings 已提交
1402
			efx->n_channels = n_channels;
1403 1404
			if (n_channels > extra_channels)
				n_channels -= extra_channels;
B
Ben Hutchings 已提交
1405
			if (separate_tx_channels) {
1406 1407 1408 1409
				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
1410
			} else {
1411 1412
				efx->n_tx_channels = n_channels;
				efx->n_rx_channels = n_channels;
B
Ben Hutchings 已提交
1413
			}
1414
			for (i = 0; i < efx->n_channels; i++)
1415 1416
				efx_get_channel(efx, i)->irq =
					xentries[i].vector;
1417 1418 1419 1420 1421
		}
	}

	/* Try single interrupt MSI */
	if (efx->interrupt_mode == EFX_INT_MODE_MSI) {
1422
		efx->n_channels = 1;
B
Ben Hutchings 已提交
1423 1424
		efx->n_rx_channels = 1;
		efx->n_tx_channels = 1;
1425 1426
		rc = pci_enable_msi(efx->pci_dev);
		if (rc == 0) {
1427
			efx_get_channel(efx, 0)->irq = efx->pci_dev->irq;
1428
		} else {
1429 1430
			netif_err(efx, drv, efx->net_dev,
				  "could not enable MSI\n");
1431 1432 1433 1434 1435 1436
			efx->interrupt_mode = EFX_INT_MODE_LEGACY;
		}
	}

	/* Assume legacy interrupts */
	if (efx->interrupt_mode == EFX_INT_MODE_LEGACY) {
1437
		efx->n_channels = 1 + (separate_tx_channels ? 1 : 0);
B
Ben Hutchings 已提交
1438 1439
		efx->n_rx_channels = 1;
		efx->n_tx_channels = 1;
1440 1441
		efx->legacy_irq = efx->pci_dev->irq;
	}
1442

1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457
	/* 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];
		}
	}

1458
	/* RSS might be usable on VFs even if it is disabled on the PF */
1459 1460 1461 1462 1463 1464 1465 1466 1467
#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;
1468

1469
	return 0;
1470 1471
}

1472
static int efx_soft_enable_interrupts(struct efx_nic *efx)
1473
{
1474 1475
	struct efx_channel *channel, *end_channel;
	int rc;
1476

1477 1478
	BUG_ON(efx->state == STATE_DISABLED);

B
Ben Hutchings 已提交
1479 1480
	efx->irq_soft_enabled = true;
	smp_wmb();
1481 1482

	efx_for_each_channel(channel, efx) {
1483 1484 1485 1486 1487
		if (!channel->type->keep_eventq) {
			rc = efx_init_eventq(channel);
			if (rc)
				goto fail;
		}
1488 1489 1490 1491
		efx_start_eventq(channel);
	}

	efx_mcdi_mode_event(efx);
1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504

	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;
1505 1506
}

B
Ben Hutchings 已提交
1507
static void efx_soft_disable_interrupts(struct efx_nic *efx)
1508 1509 1510
{
	struct efx_channel *channel;

1511 1512 1513
	if (efx->state == STATE_DISABLED)
		return;

1514 1515
	efx_mcdi_mode_poll(efx);

B
Ben Hutchings 已提交
1516 1517 1518 1519
	efx->irq_soft_enabled = false;
	smp_wmb();

	if (efx->legacy_irq)
1520 1521 1522 1523 1524 1525 1526
		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
1527
		if (!channel->type->keep_eventq)
1528
			efx_fini_eventq(channel);
1529
	}
1530 1531 1532

	/* Flush the asynchronous MCDI request queue */
	efx_mcdi_flush_async(efx);
1533 1534
}

1535
static int efx_enable_interrupts(struct efx_nic *efx)
B
Ben Hutchings 已提交
1536
{
1537 1538
	struct efx_channel *channel, *end_channel;
	int rc;
B
Ben Hutchings 已提交
1539 1540 1541 1542 1543 1544 1545 1546

	BUG_ON(efx->state == STATE_DISABLED);

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

1547
	efx->type->irq_enable_master(efx);
B
Ben Hutchings 已提交
1548 1549

	efx_for_each_channel(channel, efx) {
1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567
		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
1568
		if (channel->type->keep_eventq)
1569
			efx_fini_eventq(channel);
B
Ben Hutchings 已提交
1570 1571
	}

1572 1573 1574
	efx->type->irq_disable_non_ev(efx);

	return rc;
B
Ben Hutchings 已提交
1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587
}

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);
	}

1588
	efx->type->irq_disable_non_ev(efx);
B
Ben Hutchings 已提交
1589 1590
}

1591 1592 1593 1594 1595
static void efx_remove_interrupts(struct efx_nic *efx)
{
	struct efx_channel *channel;

	/* Remove MSI/MSI-X interrupts */
1596
	efx_for_each_channel(channel, efx)
1597 1598 1599 1600 1601 1602 1603 1604
		channel->irq = 0;
	pci_disable_msi(efx->pci_dev);
	pci_disable_msix(efx->pci_dev);

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

1605
static void efx_set_channels(struct efx_nic *efx)
1606
{
1607 1608 1609
	struct efx_channel *channel;
	struct efx_tx_queue *tx_queue;

1610
	efx->tx_channel_offset =
B
Ben Hutchings 已提交
1611
		separate_tx_channels ? efx->n_channels - efx->n_tx_channels : 0;
1612

1613 1614
	/* We need to mark which channels really have RX and TX
	 * queues, and adjust the TX queue numbers if we have separate
1615 1616 1617
	 * RX-only and TX-only channels.
	 */
	efx_for_each_channel(channel, efx) {
1618 1619 1620 1621 1622
		if (channel->channel < efx->n_rx_channels)
			channel->rx_queue.core_index = channel->channel;
		else
			channel->rx_queue.core_index = -1;

1623 1624 1625 1626
		efx_for_each_channel_tx_queue(tx_queue, channel)
			tx_queue->queue -= (efx->tx_channel_offset *
					    EFX_TXQ_TYPES);
	}
1627 1628 1629 1630 1631 1632
}

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

1633
	netif_dbg(efx, probe, efx->net_dev, "creating NIC\n");
1634 1635

	/* Carry out hardware-type specific initialisation */
1636
	rc = efx->type->probe(efx);
1637 1638 1639
	if (rc)
		return rc;

B
Ben Hutchings 已提交
1640
	/* Determine the number of channels and queues by trying to hook
1641
	 * in MSI-X interrupts. */
1642 1643
	rc = efx_probe_interrupts(efx);
	if (rc)
1644
		goto fail1;
1645

1646 1647
	efx_set_channels(efx);

1648 1649 1650
	rc = efx->type->dimension_resources(efx);
	if (rc)
		goto fail2;
1651

1652
	if (efx->n_channels > 1)
1653 1654 1655
		netdev_rss_key_fill(&efx->rx_hash_key,
				    sizeof(efx->rx_hash_key));
	efx_set_default_rx_indir_table(efx);
1656

1657 1658
	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);
1659 1660

	/* Initialise the interrupt moderation settings */
1661 1662
	efx_init_irq_moderation(efx, tx_irq_mod_usec, rx_irq_mod_usec, true,
				true);
1663 1664

	return 0;
1665

1666 1667 1668
fail2:
	efx_remove_interrupts(efx);
fail1:
1669 1670
	efx->type->remove(efx);
	return rc;
1671 1672 1673 1674
}

static void efx_remove_nic(struct efx_nic *efx)
{
1675
	netif_dbg(efx, drv, efx->net_dev, "destroying NIC\n");
1676 1677

	efx_remove_interrupts(efx);
1678
	efx->type->remove(efx);
1679 1680
}

1681 1682 1683 1684 1685
static int efx_probe_filters(struct efx_nic *efx)
{
	int rc;

	spin_lock_init(&efx->filter_lock);
1686 1687
	init_rwsem(&efx->filter_sem);
	down_write(&efx->filter_sem);
1688 1689
	rc = efx->type->filter_table_probe(efx);
	if (rc)
1690
		goto out_unlock;
1691 1692 1693 1694 1695 1696 1697 1698

#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);
1699 1700
			rc = -ENOMEM;
			goto out_unlock;
1701 1702 1703
		}
	}
#endif
1704 1705 1706
out_unlock:
	up_write(&efx->filter_sem);
	return rc;
1707 1708 1709 1710 1711 1712 1713
}

static void efx_remove_filters(struct efx_nic *efx)
{
#ifdef CONFIG_RFS_ACCEL
	kfree(efx->rps_flow_id);
#endif
1714
	down_write(&efx->filter_sem);
1715
	efx->type->filter_table_remove(efx);
1716
	up_write(&efx->filter_sem);
1717 1718 1719 1720
}

static void efx_restore_filters(struct efx_nic *efx)
{
1721
	down_read(&efx->filter_sem);
1722
	efx->type->filter_table_restore(efx);
1723
	up_read(&efx->filter_sem);
1724 1725
}

1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737
/**************************************************************************
 *
 * NIC startup/shutdown
 *
 *************************************************************************/

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

	rc = efx_probe_nic(efx);
	if (rc) {
1738
		netif_err(efx, probe, efx->net_dev, "failed to create NIC\n");
1739 1740 1741 1742 1743
		goto fail1;
	}

	rc = efx_probe_port(efx);
	if (rc) {
1744
		netif_err(efx, probe, efx->net_dev, "failed to create port\n");
1745 1746 1747
		goto fail2;
	}

1748 1749 1750 1751 1752
	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;
	}
1753
	efx->rxq_entries = efx->txq_entries = EFX_DEFAULT_DMAQ_SIZE;
1754

1755 1756 1757 1758 1759 1760 1761 1762
#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
1763 1764 1765 1766
	rc = efx_probe_filters(efx);
	if (rc) {
		netif_err(efx, probe, efx->net_dev,
			  "failed to create filter tables\n");
1767
		goto fail4;
B
Ben Hutchings 已提交
1768 1769
	}

1770 1771
	rc = efx_probe_channels(efx);
	if (rc)
1772
		goto fail5;
1773

1774 1775
	return 0;

1776
 fail5:
1777
	efx_remove_filters(efx);
1778 1779 1780 1781
 fail4:
#ifdef CONFIG_SFC_SRIOV
	efx->type->vswitching_remove(efx);
#endif
1782 1783 1784 1785 1786 1787 1788 1789
 fail3:
	efx_remove_port(efx);
 fail2:
	efx_remove_nic(efx);
 fail1:
	return rc;
}

1790 1791 1792 1793 1794 1795
/* 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.
1796
 */
1797 1798 1799
static void efx_start_all(struct efx_nic *efx)
{
	EFX_ASSERT_RESET_SERIALISED(efx);
1800
	BUG_ON(efx->state == STATE_DISABLED);
1801 1802 1803

	/* Check that it is appropriate to restart the interface. All
	 * of these flags are safe to read under just the rtnl lock */
1804 1805
	if (efx->port_enabled || !netif_running(efx->net_dev) ||
	    efx->reset_pending)
1806 1807 1808
		return;

	efx_start_port(efx);
1809
	efx_start_datapath(efx);
1810

1811 1812
	/* Start the hardware monitor if there is one */
	if (efx->type->monitor != NULL)
1813 1814
		queue_delayed_work(efx->workqueue, &efx->monitor_work,
				   efx_monitor_interval);
1815 1816 1817 1818 1819

	/* 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) {
1820 1821 1822 1823 1824
		mutex_lock(&efx->mac_lock);
		if (efx->phy_op->poll(efx))
			efx_link_status_changed(efx);
		mutex_unlock(&efx->mac_lock);
	}
1825

1826
	efx->type->start_stats(efx);
1827 1828 1829 1830
	efx->type->pull_stats(efx);
	spin_lock_bh(&efx->stats_lock);
	efx->type->update_stats(efx, NULL, NULL);
	spin_unlock_bh(&efx->stats_lock);
1831 1832
}

1833 1834 1835 1836 1837
/* 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.
 */
1838 1839 1840 1841 1842 1843 1844 1845
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;

1846 1847 1848 1849 1850 1851 1852
	/* 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);
1853
	efx->type->stop_stats(efx);
1854 1855
	efx_stop_port(efx);

1856 1857 1858 1859 1860 1861
	/* 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));
1862 1863 1864
	netif_tx_disable(efx->net_dev);

	efx_stop_datapath(efx);
1865 1866 1867 1868
}

static void efx_remove_all(struct efx_nic *efx)
{
1869
	efx_remove_channels(efx);
1870
	efx_remove_filters(efx);
1871 1872 1873
#ifdef CONFIG_SFC_SRIOV
	efx->type->vswitching_remove(efx);
#endif
1874 1875 1876 1877 1878 1879 1880 1881 1882 1883
	efx_remove_port(efx);
	efx_remove_nic(efx);
}

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

1884
static unsigned int irq_mod_ticks(unsigned int usecs, unsigned int quantum_ns)
1885
{
1886 1887
	if (usecs == 0)
		return 0;
1888
	if (usecs * 1000 < quantum_ns)
1889
		return 1; /* never round down to 0 */
1890
	return usecs * 1000 / quantum_ns;
1891 1892
}

1893
/* Set interrupt moderation parameters */
1894 1895 1896
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)
1897
{
1898
	struct efx_channel *channel;
1899 1900 1901 1902 1903
	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;
1904 1905 1906

	EFX_ASSERT_RESET_SERIALISED(efx);

1907
	if (tx_usecs > irq_mod_max || rx_usecs > irq_mod_max)
1908 1909
		return -EINVAL;

1910 1911 1912
	tx_ticks = irq_mod_ticks(tx_usecs, efx->timer_quantum_ns);
	rx_ticks = irq_mod_ticks(rx_usecs, efx->timer_quantum_ns);

1913 1914 1915 1916 1917 1918 1919
	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;
	}

1920
	efx->irq_rx_adaptive = rx_adaptive;
1921
	efx->irq_rx_moderation = rx_ticks;
1922
	efx_for_each_channel(channel, efx) {
1923
		if (efx_channel_has_rx_queue(channel))
1924
			channel->irq_moderation = rx_ticks;
1925
		else if (efx_channel_has_tx_queues(channel))
1926 1927
			channel->irq_moderation = tx_ticks;
	}
1928 1929

	return 0;
1930 1931
}

1932 1933 1934
void efx_get_irq_moderation(struct efx_nic *efx, unsigned int *tx_usecs,
			    unsigned int *rx_usecs, bool *rx_adaptive)
{
1935 1936 1937 1938
	/* We must round up when converting ticks to microseconds
	 * because we round down when converting the other way.
	 */

1939
	*rx_adaptive = efx->irq_rx_adaptive;
1940 1941 1942
	*rx_usecs = DIV_ROUND_UP(efx->irq_rx_moderation *
				 efx->timer_quantum_ns,
				 1000);
1943 1944 1945 1946 1947 1948 1949 1950

	/* 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
1951
		*tx_usecs = DIV_ROUND_UP(
1952
			efx->channel[efx->tx_channel_offset]->irq_moderation *
1953 1954
			efx->timer_quantum_ns,
			1000);
1955 1956
}

1957 1958 1959 1960 1961 1962
/**************************************************************************
 *
 * Hardware monitor
 *
 **************************************************************************/

1963
/* Run periodically off the general workqueue */
1964 1965 1966 1967 1968
static void efx_monitor(struct work_struct *data)
{
	struct efx_nic *efx = container_of(data, struct efx_nic,
					   monitor_work.work);

1969 1970 1971
	netif_vdbg(efx, timer, efx->net_dev,
		   "hardware monitor executing on CPU %d\n",
		   raw_smp_processor_id());
1972
	BUG_ON(efx->type->monitor == NULL);
1973 1974 1975

	/* If the mac_lock is already held then it is likely a port
	 * reconfiguration is already in place, which will likely do
1976 1977 1978 1979 1980 1981
	 * 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);
	}
1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997

	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)
{
1998
	struct efx_nic *efx = netdev_priv(net_dev);
1999
	struct mii_ioctl_data *data = if_mii(ifr);
2000

2001
	if (cmd == SIOCSHWTSTAMP)
2002 2003 2004
		return efx_ptp_set_ts_config(efx, ifr);
	if (cmd == SIOCGHWTSTAMP)
		return efx_ptp_get_ts_config(efx, ifr);
2005

2006 2007 2008 2009 2010 2011
	/* 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);
2012 2013 2014 2015 2016 2017 2018 2019
}

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

2020 2021 2022 2023 2024 2025 2026
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);
2027 2028
	napi_hash_add(&channel->napi_str);
	efx_channel_init_lock(channel);
2029 2030
}

2031
static void efx_init_napi(struct efx_nic *efx)
2032 2033 2034
{
	struct efx_channel *channel;

2035 2036
	efx_for_each_channel(channel, efx)
		efx_init_napi_channel(channel);
2037 2038 2039 2040
}

static void efx_fini_napi_channel(struct efx_channel *channel)
{
2041
	if (channel->napi_dev) {
2042
		netif_napi_del(&channel->napi_str);
2043 2044
		napi_hash_del(&channel->napi_str);
	}
2045
	channel->napi_dev = NULL;
2046 2047 2048 2049 2050 2051
}

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

2052 2053
	efx_for_each_channel(channel, efx)
		efx_fini_napi_channel(channel);
2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069
}

/**************************************************************************
 *
 * 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)
{
2070
	struct efx_nic *efx = netdev_priv(net_dev);
2071 2072
	struct efx_channel *channel;

2073
	efx_for_each_channel(channel, efx)
2074 2075 2076 2077 2078
		efx_schedule_channel(channel);
}

#endif

2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109
#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

2110 2111 2112 2113 2114 2115 2116
/**************************************************************************
 *
 * Kernel net device interface
 *
 *************************************************************************/

/* Context: process, rtnl_lock() held. */
2117
int efx_net_open(struct net_device *net_dev)
2118
{
2119
	struct efx_nic *efx = netdev_priv(net_dev);
2120 2121
	int rc;

2122 2123
	netif_dbg(efx, ifup, efx->net_dev, "opening device on CPU %d\n",
		  raw_smp_processor_id());
2124

2125 2126 2127
	rc = efx_check_disabled(efx);
	if (rc)
		return rc;
2128 2129
	if (efx->phy_mode & PHY_MODE_SPECIAL)
		return -EBUSY;
2130 2131
	if (efx_mcdi_poll_reboot(efx) && efx_reset(efx, RESET_TYPE_ALL))
		return -EIO;
2132

2133 2134 2135 2136
	/* Notify the kernel of the link state polled during driver load,
	 * before the monitor starts running */
	efx_link_status_changed(efx);

2137
	efx_start_all(efx);
2138
	efx_selftest_async_start(efx);
2139 2140 2141 2142 2143 2144 2145
	return 0;
}

/* Context: process, rtnl_lock() held.
 * Note that the kernel will ignore our return code; this method
 * should really be a void.
 */
2146
int efx_net_stop(struct net_device *net_dev)
2147
{
2148
	struct efx_nic *efx = netdev_priv(net_dev);
2149

2150 2151
	netif_dbg(efx, ifdown, efx->net_dev, "closing on CPU %d\n",
		  raw_smp_processor_id());
2152

2153 2154
	/* Stop the device and flush all the channels */
	efx_stop_all(efx);
2155 2156 2157 2158

	return 0;
}

2159
/* Context: process, dev_base_lock or RTNL held, non-blocking. */
B
Ben Hutchings 已提交
2160 2161
static struct rtnl_link_stats64 *efx_net_stats(struct net_device *net_dev,
					       struct rtnl_link_stats64 *stats)
2162
{
2163
	struct efx_nic *efx = netdev_priv(net_dev);
2164

2165
	spin_lock_bh(&efx->stats_lock);
2166
	efx->type->update_stats(efx, NULL, stats);
2167 2168
	spin_unlock_bh(&efx->stats_lock);

2169 2170 2171 2172 2173 2174
	return stats;
}

/* Context: netif_tx_lock held, BHs disabled. */
static void efx_watchdog(struct net_device *net_dev)
{
2175
	struct efx_nic *efx = netdev_priv(net_dev);
2176

2177 2178 2179
	netif_err(efx, tx_err, efx->net_dev,
		  "TX stuck with port_enabled=%d: resetting channels\n",
		  efx->port_enabled);
2180

2181
	efx_schedule_reset(efx, RESET_TYPE_TX_WATCHDOG);
2182 2183 2184 2185 2186 2187
}


/* Context: process, rtnl_lock() held. */
static int efx_change_mtu(struct net_device *net_dev, int new_mtu)
{
2188
	struct efx_nic *efx = netdev_priv(net_dev);
2189
	int rc;
2190

2191 2192 2193
	rc = efx_check_disabled(efx);
	if (rc)
		return rc;
2194 2195 2196
	if (new_mtu > EFX_MAX_MTU)
		return -EINVAL;

2197
	netif_dbg(efx, drv, efx->net_dev, "changing MTU to %d\n", new_mtu);
2198

2199 2200 2201
	efx_device_detach_sync(efx);
	efx_stop_all(efx);

B
Ben Hutchings 已提交
2202
	mutex_lock(&efx->mac_lock);
2203
	net_dev->mtu = new_mtu;
2204
	efx_mac_reconfigure(efx);
B
Ben Hutchings 已提交
2205 2206
	mutex_unlock(&efx->mac_lock);

2207
	efx_start_all(efx);
2208
	netif_device_attach(efx->net_dev);
2209
	return 0;
2210 2211 2212 2213
}

static int efx_set_mac_address(struct net_device *net_dev, void *data)
{
2214
	struct efx_nic *efx = netdev_priv(net_dev);
2215
	struct sockaddr *addr = data;
2216
	u8 *new_addr = addr->sa_data;
2217 2218
	u8 old_addr[6];
	int rc;
2219 2220

	if (!is_valid_ether_addr(new_addr)) {
2221 2222 2223
		netif_err(efx, drv, efx->net_dev,
			  "invalid ethernet MAC address requested: %pM\n",
			  new_addr);
2224
		return -EADDRNOTAVAIL;
2225 2226
	}

2227 2228
	/* save old address */
	ether_addr_copy(old_addr, net_dev->dev_addr);
2229
	ether_addr_copy(net_dev->dev_addr, new_addr);
2230 2231
	if (efx->type->set_mac_address) {
		rc = efx->type->set_mac_address(efx);
2232 2233 2234 2235 2236
		if (rc) {
			ether_addr_copy(net_dev->dev_addr, old_addr);
			return rc;
		}
	}
2237 2238

	/* Reconfigure the MAC */
B
Ben Hutchings 已提交
2239
	mutex_lock(&efx->mac_lock);
2240
	efx_mac_reconfigure(efx);
B
Ben Hutchings 已提交
2241
	mutex_unlock(&efx->mac_lock);
2242 2243 2244 2245

	return 0;
}

2246
/* Context: netif_addr_lock held, BHs disabled. */
2247
static void efx_set_rx_mode(struct net_device *net_dev)
2248
{
2249
	struct efx_nic *efx = netdev_priv(net_dev);
2250

2251 2252 2253
	if (efx->port_enabled)
		queue_work(efx->workqueue, &efx->mac_work);
	/* Otherwise efx_start_port() will do this */
2254 2255
}

2256
static int efx_set_features(struct net_device *net_dev, netdev_features_t data)
2257 2258 2259 2260 2261
{
	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)
2262
		return efx->type->filter_clear_rx(efx, EFX_FILTER_PRI_MANUAL);
2263 2264 2265 2266

	return 0;
}

2267
static const struct net_device_ops efx_netdev_ops = {
S
Stephen Hemminger 已提交
2268 2269
	.ndo_open		= efx_net_open,
	.ndo_stop		= efx_net_stop,
2270
	.ndo_get_stats64	= efx_net_stats,
S
Stephen Hemminger 已提交
2271 2272 2273 2274 2275 2276
	.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,
2277
	.ndo_set_rx_mode	= efx_set_rx_mode,
2278
	.ndo_set_features	= efx_set_features,
2279
#ifdef CONFIG_SFC_SRIOV
2280 2281 2282 2283
	.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,
2284
	.ndo_set_vf_link_state  = efx_sriov_set_vf_link_state,
2285
	.ndo_get_phys_port_id   = efx_sriov_get_phys_port_id,
2286
#endif
S
Stephen Hemminger 已提交
2287 2288 2289
#ifdef CONFIG_NET_POLL_CONTROLLER
	.ndo_poll_controller = efx_netpoll,
#endif
2290
	.ndo_setup_tc		= efx_setup_tc,
2291 2292 2293
#ifdef CONFIG_NET_RX_BUSY_POLL
	.ndo_busy_poll		= efx_busy_poll,
#endif
2294 2295 2296
#ifdef CONFIG_RFS_ACCEL
	.ndo_rx_flow_steer	= efx_filter_rfs,
#endif
S
Stephen Hemminger 已提交
2297 2298
};

2299 2300 2301 2302 2303 2304 2305
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);
}

2306 2307 2308
static int efx_netdev_event(struct notifier_block *this,
			    unsigned long event, void *ptr)
{
2309
	struct net_device *net_dev = netdev_notifier_info_to_dev(ptr);
2310

2311
	if ((net_dev->netdev_ops == &efx_netdev_ops) &&
2312 2313
	    event == NETDEV_CHANGENAME)
		efx_update_name(netdev_priv(net_dev));
2314 2315 2316 2317 2318 2319 2320 2321

	return NOTIFY_DONE;
}

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

B
Ben Hutchings 已提交
2322 2323 2324 2325 2326 2327
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);
}
2328
static DEVICE_ATTR(phy_type, 0444, show_phy_type, NULL);
B
Ben Hutchings 已提交
2329

2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351
#ifdef CONFIG_SFC_MCDI_LOGGING
static ssize_t show_mcdi_log(struct device *dev, struct device_attribute *attr,
			     char *buf)
{
	struct efx_nic *efx = pci_get_drvdata(to_pci_dev(dev));
	struct efx_mcdi_iface *mcdi = efx_mcdi(efx);

	return scnprintf(buf, PAGE_SIZE, "%d\n", mcdi->logging_enabled);
}
static ssize_t set_mcdi_log(struct device *dev, struct device_attribute *attr,
			    const char *buf, size_t count)
{
	struct efx_nic *efx = pci_get_drvdata(to_pci_dev(dev));
	struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
	bool enable = count > 0 && *buf != '0';

	mcdi->logging_enabled = enable;
	return count;
}
static DEVICE_ATTR(mcdi_logging, 0644, show_mcdi_log, set_mcdi_log);
#endif

2352 2353 2354
static int efx_register_netdev(struct efx_nic *efx)
{
	struct net_device *net_dev = efx->net_dev;
2355
	struct efx_channel *channel;
2356 2357 2358 2359
	int rc;

	net_dev->watchdog_timeo = 5 * HZ;
	net_dev->irq = efx->pci_dev->irq;
2360 2361
	net_dev->netdev_ops = &efx_netdev_ops;
	if (efx_nic_rev(efx) >= EFX_REV_HUNT_A0)
2362
		net_dev->priv_flags |= IFF_UNICAST_FLT;
2363
	net_dev->ethtool_ops = &efx_ethtool_ops;
2364
	net_dev->gso_max_segs = EFX_TSO_MAX_SEGS;
2365

2366
	rtnl_lock();
2367

2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380
	/* 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;
	}

2381 2382 2383
	rc = dev_alloc_name(net_dev, net_dev->name);
	if (rc < 0)
		goto fail_locked;
2384
	efx_update_name(efx);
2385

2386 2387 2388
	/* Always start with carrier off; PHY events will detect the link */
	netif_carrier_off(net_dev);

2389 2390 2391 2392
	rc = register_netdevice(net_dev);
	if (rc)
		goto fail_locked;

2393 2394
	efx_for_each_channel(channel, efx) {
		struct efx_tx_queue *tx_queue;
2395 2396
		efx_for_each_channel_tx_queue(tx_queue, channel)
			efx_init_tx_queue_core_txq(tx_queue);
2397 2398
	}

2399 2400
	efx_associate(efx);

2401
	rtnl_unlock();
2402

B
Ben Hutchings 已提交
2403 2404
	rc = device_create_file(&efx->pci_dev->dev, &dev_attr_phy_type);
	if (rc) {
2405 2406
		netif_err(efx, drv, efx->net_dev,
			  "failed to init net dev attributes\n");
B
Ben Hutchings 已提交
2407 2408
		goto fail_registered;
	}
2409 2410 2411 2412 2413 2414 2415 2416
#ifdef CONFIG_SFC_MCDI_LOGGING
	rc = device_create_file(&efx->pci_dev->dev, &dev_attr_mcdi_logging);
	if (rc) {
		netif_err(efx, drv, efx->net_dev,
			  "failed to init net dev attributes\n");
		goto fail_attr_mcdi_logging;
	}
#endif
B
Ben Hutchings 已提交
2417

2418
	return 0;
B
Ben Hutchings 已提交
2419

2420 2421 2422 2423
#ifdef CONFIG_SFC_MCDI_LOGGING
fail_attr_mcdi_logging:
	device_remove_file(&efx->pci_dev->dev, &dev_attr_phy_type);
#endif
2424 2425
fail_registered:
	rtnl_lock();
2426
	efx_dissociate(efx);
2427
	unregister_netdevice(net_dev);
2428
fail_locked:
2429
	efx->state = STATE_UNINIT;
2430
	rtnl_unlock();
2431
	netif_err(efx, drv, efx->net_dev, "could not register net dev\n");
2432
	return rc;
2433 2434 2435 2436 2437 2438 2439
}

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

2440
	BUG_ON(netdev_priv(efx->net_dev) != efx);
2441

2442 2443 2444 2445 2446 2447 2448 2449
	if (efx_dev_registered(efx)) {
		strlcpy(efx->name, pci_name(efx->pci_dev), sizeof(efx->name));
#ifdef CONFIG_SFC_MCDI_LOGGING
		device_remove_file(&efx->pci_dev->dev, &dev_attr_mcdi_logging);
#endif
		device_remove_file(&efx->pci_dev->dev, &dev_attr_phy_type);
		unregister_netdev(efx->net_dev);
	}
2450 2451 2452 2453 2454 2455 2456 2457
}

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

B
Ben Hutchings 已提交
2458 2459
/* Tears down the entire software state and most of the hardware state
 * before reset.  */
B
Ben Hutchings 已提交
2460
void efx_reset_down(struct efx_nic *efx, enum reset_type method)
2461 2462 2463
{
	EFX_ASSERT_RESET_SERIALISED(efx);

2464 2465 2466
	if (method == RESET_TYPE_MCDI_TIMEOUT)
		efx->type->prepare_flr(efx);

B
Ben Hutchings 已提交
2467
	efx_stop_all(efx);
B
Ben Hutchings 已提交
2468
	efx_disable_interrupts(efx);
2469 2470

	mutex_lock(&efx->mac_lock);
2471 2472
	if (efx->port_initialized && method != RESET_TYPE_INVISIBLE &&
	    method != RESET_TYPE_DATAPATH)
2473
		efx->phy_op->fini(efx);
2474
	efx->type->fini(efx);
2475 2476
}

B
Ben Hutchings 已提交
2477 2478 2479 2480 2481
/* 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
2482
int efx_reset_up(struct efx_nic *efx, enum reset_type method, bool ok)
2483 2484 2485
{
	int rc;

B
Ben Hutchings 已提交
2486
	EFX_ASSERT_RESET_SERIALISED(efx);
2487

2488 2489 2490 2491
	if (method == RESET_TYPE_MCDI_TIMEOUT)
		efx->type->finish_flr(efx);

	/* Ensure that SRAM is initialised even if we're disabling the device */
2492
	rc = efx->type->init(efx);
2493
	if (rc) {
2494
		netif_err(efx, drv, efx->net_dev, "failed to initialise NIC\n");
2495
		goto fail;
2496 2497
	}

2498 2499 2500
	if (!ok)
		goto fail;

2501 2502
	if (efx->port_initialized && method != RESET_TYPE_INVISIBLE &&
	    method != RESET_TYPE_DATAPATH) {
2503 2504 2505
		rc = efx->phy_op->init(efx);
		if (rc)
			goto fail;
2506 2507
		rc = efx->phy_op->reconfigure(efx);
		if (rc && rc != -EPERM)
2508 2509
			netif_err(efx, drv, efx->net_dev,
				  "could not restore PHY settings\n");
2510 2511
	}

2512 2513 2514
	rc = efx_enable_interrupts(efx);
	if (rc)
		goto fail;
2515 2516 2517 2518 2519 2520 2521 2522 2523

#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

2524
	down_read(&efx->filter_sem);
B
Ben Hutchings 已提交
2525
	efx_restore_filters(efx);
2526
	up_read(&efx->filter_sem);
2527 2528
	if (efx->type->sriov_reset)
		efx->type->sriov_reset(efx);
2529 2530 2531 2532 2533 2534 2535 2536 2537

	mutex_unlock(&efx->mac_lock);

	efx_start_all(efx);

	return 0;

fail:
	efx->port_initialized = false;
B
Ben Hutchings 已提交
2538 2539 2540

	mutex_unlock(&efx->mac_lock);

2541 2542 2543
	return rc;
}

2544 2545
/* 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.
2546
 *
2547
 * Caller must hold the rtnl_lock.
2548
 */
2549
int efx_reset(struct efx_nic *efx, enum reset_type method)
2550
{
2551 2552
	int rc, rc2;
	bool disabled;
2553

2554 2555
	netif_info(efx, drv, efx->net_dev, "resetting (%s)\n",
		   RESET_TYPE(method));
2556

2557
	efx_device_detach_sync(efx);
B
Ben Hutchings 已提交
2558
	efx_reset_down(efx, method);
2559

2560
	rc = efx->type->reset(efx, method);
2561
	if (rc) {
2562
		netif_err(efx, drv, efx->net_dev, "failed to reset hardware\n");
2563
		goto out;
2564 2565
	}

2566 2567 2568
	/* Clear flags for the scopes we covered.  We assume the NIC and
	 * driver are now quiescent so that there is no race here.
	 */
2569 2570 2571 2572
	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);
2573 2574 2575 2576 2577 2578 2579

	/* 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);

2580
out:
2581
	/* Leave device stopped if necessary */
2582 2583 2584
	disabled = rc ||
		method == RESET_TYPE_DISABLE ||
		method == RESET_TYPE_RECOVER_OR_DISABLE;
2585 2586 2587 2588 2589
	rc2 = efx_reset_up(efx, method, !disabled);
	if (rc2) {
		disabled = true;
		if (!rc)
			rc = rc2;
2590 2591
	}

2592
	if (disabled) {
2593
		dev_close(efx->net_dev);
2594
		netif_err(efx, drv, efx->net_dev, "has been disabled\n");
2595 2596
		efx->state = STATE_DISABLED;
	} else {
2597
		netif_dbg(efx, drv, efx->net_dev, "reset complete\n");
2598
		netif_device_attach(efx->net_dev);
2599
	}
2600 2601 2602
	return rc;
}

2603 2604 2605 2606 2607
/* Try recovery mechanisms.
 * For now only EEH is supported.
 * Returns 0 if the recovery mechanisms are unsuccessful.
 * Returns a non-zero value otherwise.
 */
2608
int efx_try_recovery(struct efx_nic *efx)
2609 2610 2611 2612 2613 2614 2615
{
#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.
	 */
2616
	struct eeh_dev *eehdev = pci_dev_to_eeh_dev(efx->pci_dev);
2617 2618 2619 2620 2621 2622 2623 2624 2625 2626
	if (eeh_dev_check_failure(eehdev)) {
		/* The EEH mechanisms will handle the error and reset the
		 * device if necessary.
		 */
		return 1;
	}
#endif
	return 0;
}

2627 2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638 2639 2640 2641 2642 2643 2644
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;
}

2645 2646 2647 2648 2649
/* 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)
{
2650
	struct efx_nic *efx = container_of(data, struct efx_nic, reset_work);
2651 2652 2653 2654 2655 2656
	unsigned long pending;
	enum reset_type method;

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

2657 2658 2659
	if (method == RESET_TYPE_MC_BIST)
		efx_wait_for_bist_end(efx);

2660 2661 2662 2663
	if ((method == RESET_TYPE_RECOVER_OR_DISABLE ||
	     method == RESET_TYPE_RECOVER_OR_ALL) &&
	    efx_try_recovery(efx))
		return;
2664

2665
	if (!pending)
2666 2667
		return;

2668
	rtnl_lock();
2669 2670 2671 2672 2673 2674

	/* 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)
2675
		(void)efx_reset(efx, method);
2676

2677
	rtnl_unlock();
2678 2679 2680 2681 2682 2683
}

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

2684 2685 2686 2687 2688 2689 2690
	if (efx->state == STATE_RECOVERY) {
		netif_dbg(efx, drv, efx->net_dev,
			  "recovering: skip scheduling %s reset\n",
			  RESET_TYPE(type));
		return;
	}

2691 2692 2693
	switch (type) {
	case RESET_TYPE_INVISIBLE:
	case RESET_TYPE_ALL:
2694
	case RESET_TYPE_RECOVER_OR_ALL:
2695 2696
	case RESET_TYPE_WORLD:
	case RESET_TYPE_DISABLE:
2697
	case RESET_TYPE_RECOVER_OR_DISABLE:
2698
	case RESET_TYPE_DATAPATH:
2699
	case RESET_TYPE_MC_BIST:
2700
	case RESET_TYPE_MCDI_TIMEOUT:
2701
		method = type;
2702 2703
		netif_dbg(efx, drv, efx->net_dev, "scheduling %s reset\n",
			  RESET_TYPE(method));
2704 2705
		break;
	default:
2706
		method = efx->type->map_reset_reason(type);
2707 2708 2709
		netif_dbg(efx, drv, efx->net_dev,
			  "scheduling %s reset for %s\n",
			  RESET_TYPE(method), RESET_TYPE(type));
2710 2711
		break;
	}
2712

2713
	set_bit(method, &efx->reset_pending);
2714 2715 2716 2717 2718 2719 2720
	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;
2721

2722 2723 2724 2725
	/* 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);

2726
	queue_work(reset_workqueue, &efx->reset_work);
2727 2728 2729 2730 2731 2732 2733 2734 2735
}

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

/* PCI device ID table */
2736
static const struct pci_device_id efx_pci_table[] = {
2737 2738
	{PCI_DEVICE(PCI_VENDOR_ID_SOLARFLARE,
		    PCI_DEVICE_ID_SOLARFLARE_SFC4000A_0),
2739
	 .driver_data = (unsigned long) &falcon_a1_nic_type},
2740 2741
	{PCI_DEVICE(PCI_VENDOR_ID_SOLARFLARE,
		    PCI_DEVICE_ID_SOLARFLARE_SFC4000B),
2742
	 .driver_data = (unsigned long) &falcon_b0_nic_type},
2743
	{PCI_DEVICE(PCI_VENDOR_ID_SOLARFLARE, 0x0803),	/* SFC9020 */
2744
	 .driver_data = (unsigned long) &siena_a0_nic_type},
2745
	{PCI_DEVICE(PCI_VENDOR_ID_SOLARFLARE, 0x0813),	/* SFL9021 */
2746
	 .driver_data = (unsigned long) &siena_a0_nic_type},
2747 2748
	{PCI_DEVICE(PCI_VENDOR_ID_SOLARFLARE, 0x0903),  /* SFC9120 PF */
	 .driver_data = (unsigned long) &efx_hunt_a0_nic_type},
2749 2750
	{PCI_DEVICE(PCI_VENDOR_ID_SOLARFLARE, 0x1903),  /* SFC9120 VF */
	 .driver_data = (unsigned long) &efx_hunt_a0_vf_nic_type},
2751 2752
	{PCI_DEVICE(PCI_VENDOR_ID_SOLARFLARE, 0x0923),  /* SFC9140 PF */
	 .driver_data = (unsigned long) &efx_hunt_a0_nic_type},
2753 2754 2755 2756 2757
	{0}			/* end of list */
};

/**************************************************************************
 *
2758
 * Dummy PHY/MAC operations
2759
 *
2760
 * Can be used for some unimplemented operations
2761 2762 2763 2764 2765 2766 2767 2768 2769
 * 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
2770 2771

static bool efx_port_dummy_op_poll(struct efx_nic *efx)
S
Steve Hodgson 已提交
2772 2773 2774
{
	return false;
}
2775

2776
static const struct efx_phy_operations efx_dummy_phy_operations = {
2777
	.init		 = efx_port_dummy_op_int,
B
Ben Hutchings 已提交
2778
	.reconfigure	 = efx_port_dummy_op_int,
S
Steve Hodgson 已提交
2779
	.poll		 = efx_port_dummy_op_poll,
2780 2781 2782 2783 2784 2785 2786 2787 2788 2789 2790 2791
	.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).
 */
2792
static int efx_init_struct(struct efx_nic *efx,
2793 2794
			   struct pci_dev *pci_dev, struct net_device *net_dev)
{
2795
	int i;
2796 2797

	/* Initialise common structures */
2798 2799
	INIT_LIST_HEAD(&efx->node);
	INIT_LIST_HEAD(&efx->secondary_list);
2800
	spin_lock_init(&efx->biu_lock);
2801 2802 2803
#ifdef CONFIG_SFC_MTD
	INIT_LIST_HEAD(&efx->mtd_list);
#endif
2804 2805
	INIT_WORK(&efx->reset_work, efx_reset_work);
	INIT_DELAYED_WORK(&efx->monitor_work, efx_monitor);
2806
	INIT_DELAYED_WORK(&efx->selftest_work, efx_selftest_async_work);
2807
	efx->pci_dev = pci_dev;
2808
	efx->msg_enable = debug;
2809
	efx->state = STATE_UNINIT;
2810 2811 2812
	strlcpy(efx->name, pci_name(pci_dev), sizeof(efx->name));

	efx->net_dev = net_dev;
2813
	efx->rx_prefix_size = efx->type->rx_prefix_size;
2814 2815
	efx->rx_ip_align =
		NET_IP_ALIGN ? (efx->rx_prefix_size + NET_IP_ALIGN) % 4 : 0;
2816 2817
	efx->rx_packet_hash_offset =
		efx->type->rx_hash_offset - efx->type->rx_prefix_size;
2818 2819
	efx->rx_packet_ts_offset =
		efx->type->rx_ts_offset - efx->type->rx_prefix_size;
2820 2821 2822
	spin_lock_init(&efx->stats_lock);
	mutex_init(&efx->mac_lock);
	efx->phy_op = &efx_dummy_phy_operations;
2823
	efx->mdio.dev = net_dev;
2824
	INIT_WORK(&efx->mac_work, efx_mac_work);
2825
	init_waitqueue_head(&efx->flush_wq);
2826 2827

	for (i = 0; i < EFX_MAX_CHANNELS; i++) {
2828 2829 2830
		efx->channel[i] = efx_alloc_channel(efx, i, NULL);
		if (!efx->channel[i])
			goto fail;
B
Ben Hutchings 已提交
2831 2832
		efx->msi_context[i].efx = efx;
		efx->msi_context[i].index = i;
2833 2834 2835 2836 2837 2838
	}

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

2839 2840 2841 2842
	/* 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);
2843
	if (!efx->workqueue)
2844
		goto fail;
2845

2846
	return 0;
2847 2848 2849 2850

fail:
	efx_fini_struct(efx);
	return -ENOMEM;
2851 2852 2853 2854
}

static void efx_fini_struct(struct efx_nic *efx)
{
2855 2856 2857 2858 2859
	int i;

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

2860 2861
	kfree(efx->vpd_sn);

2862 2863 2864 2865 2866 2867
	if (efx->workqueue) {
		destroy_workqueue(efx->workqueue);
		efx->workqueue = NULL;
	}
}

2868 2869 2870 2871 2872 2873 2874 2875 2876 2877 2878
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);
}

2879 2880 2881 2882 2883 2884 2885 2886 2887 2888 2889
/**************************************************************************
 *
 * 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)
{
2890 2891 2892 2893 2894 2895
	/* 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
2896
	efx_disable_interrupts(efx);
2897
	efx_nic_fini_interrupt(efx);
2898
	efx_fini_port(efx);
2899
	efx->type->fini(efx);
2900 2901 2902 2903 2904
	efx_fini_napi(efx);
	efx_remove_all(efx);
}

/* Final NIC shutdown
2905 2906
 * This is called only at module unload (or hotplug removal).  A PF can call
 * this on its VFs to ensure they are unbound first.
2907 2908 2909 2910 2911 2912 2913 2914 2915 2916 2917
 */
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();
2918
	efx_dissociate(efx);
2919
	dev_close(efx->net_dev);
B
Ben Hutchings 已提交
2920
	efx_disable_interrupts(efx);
2921 2922
	rtnl_unlock();

2923 2924 2925
	if (efx->type->sriov_fini)
		efx->type->sriov_fini(efx);

2926 2927
	efx_unregister_netdev(efx);

2928 2929
	efx_mtd_remove(efx);

2930 2931 2932
	efx_pci_remove_main(efx);

	efx_fini_io(efx);
2933
	netif_dbg(efx, drv, efx->net_dev, "shutdown successful\n");
2934 2935 2936

	efx_fini_struct(efx);
	free_netdev(efx->net_dev);
2937 2938

	pci_disable_pcie_error_reporting(pci_dev);
2939 2940
};

2941 2942 2943 2944 2945 2946
/* 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
2947
static void efx_probe_vpd_strings(struct efx_nic *efx)
2948 2949 2950 2951
{
	struct pci_dev *dev = efx->pci_dev;
	char vpd_data[SFC_VPD_LEN];
	ssize_t vpd_size;
2952
	int ro_start, ro_size, i, j;
2953 2954 2955 2956 2957 2958 2959 2960 2961

	/* 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 */
2962 2963
	ro_start = pci_vpd_find_tag(vpd_data, 0, vpd_size, PCI_VPD_LRDT_RO_DATA);
	if (ro_start < 0) {
2964 2965 2966 2967
		netif_err(efx, drv, efx->net_dev, "VPD Read-only not found\n");
		return;
	}

2968 2969 2970
	ro_size = pci_vpd_lrdt_size(&vpd_data[ro_start]);
	j = ro_size;
	i = ro_start + PCI_VPD_LRDT_TAG_SIZE;
2971 2972 2973 2974 2975 2976 2977 2978 2979 2980 2981 2982 2983 2984 2985 2986 2987 2988 2989
	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]);
2990 2991 2992 2993 2994 2995 2996 2997 2998 2999 3000 3001 3002 3003 3004 3005 3006 3007 3008 3009 3010

	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]);
3011 3012 3013
}


3014 3015 3016 3017 3018 3019 3020 3021 3022 3023 3024 3025
/* 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;

3026
	efx_init_napi(efx);
3027

3028
	rc = efx->type->init(efx);
3029
	if (rc) {
3030 3031
		netif_err(efx, probe, efx->net_dev,
			  "failed to initialise NIC\n");
3032
		goto fail3;
3033 3034 3035 3036
	}

	rc = efx_init_port(efx);
	if (rc) {
3037 3038
		netif_err(efx, probe, efx->net_dev,
			  "failed to initialise port\n");
3039
		goto fail4;
3040 3041
	}

3042
	rc = efx_nic_init_interrupt(efx);
3043
	if (rc)
3044
		goto fail5;
3045 3046 3047
	rc = efx_enable_interrupts(efx);
	if (rc)
		goto fail6;
3048 3049 3050

	return 0;

3051 3052
 fail6:
	efx_nic_fini_interrupt(efx);
3053
 fail5:
3054 3055
	efx_fini_port(efx);
 fail4:
3056
	efx->type->fini(efx);
3057 3058 3059 3060 3061 3062 3063 3064 3065 3066
 fail3:
	efx_fini_napi(efx);
	efx_remove_all(efx);
 fail1:
	return rc;
}

/* NIC initialisation
 *
 * This is called at module load (or hotplug insertion,
3067
 * theoretically).  It sets up PCI mappings, resets the NIC,
3068 3069 3070 3071 3072
 * 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
3073
static int efx_pci_probe(struct pci_dev *pci_dev,
3074
			 const struct pci_device_id *entry)
3075 3076 3077
{
	struct net_device *net_dev;
	struct efx_nic *efx;
3078
	int rc;
3079 3080

	/* Allocate and initialise a struct net_device and struct efx_nic */
3081 3082
	net_dev = alloc_etherdev_mqs(sizeof(*efx), EFX_MAX_CORE_TX_QUEUES,
				     EFX_MAX_RX_QUEUES);
3083 3084
	if (!net_dev)
		return -ENOMEM;
3085 3086 3087
	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
3088
			      NETIF_F_HIGHDMA | NETIF_F_TSO |
3089
			      NETIF_F_RXCSUM);
3090
	if (efx->type->offload_features & NETIF_F_V6_CSUM)
B
Ben Hutchings 已提交
3091
		net_dev->features |= NETIF_F_TSO6;
3092 3093
	/* Mask for features that also apply to VLAN devices */
	net_dev->vlan_features |= (NETIF_F_ALL_CSUM | NETIF_F_SG |
3094 3095 3096 3097
				   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;
3098
	pci_set_drvdata(pci_dev, efx);
3099
	SET_NETDEV_DEV(net_dev, &pci_dev->dev);
3100
	rc = efx_init_struct(efx, pci_dev, net_dev);
3101 3102 3103
	if (rc)
		goto fail1;

3104
	netif_info(efx, probe, efx->net_dev,
3105
		   "Solarflare NIC detected\n");
3106

3107 3108
	if (!efx->type->is_vf)
		efx_probe_vpd_strings(efx);
3109

3110 3111 3112 3113 3114
	/* Set up basic I/O (BAR mappings etc) */
	rc = efx_init_io(efx);
	if (rc)
		goto fail2;

3115 3116 3117
	rc = efx_pci_probe_main(efx);
	if (rc)
		goto fail3;
3118 3119 3120

	rc = efx_register_netdev(efx);
	if (rc)
3121
		goto fail4;
3122

3123 3124 3125 3126 3127 3128
	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);
	}
3129

3130
	netif_dbg(efx, probe, efx->net_dev, "initialisation successful\n");
3131

3132
	/* Try to create MTDs, but allow this to fail */
3133
	rtnl_lock();
3134
	rc = efx_mtd_probe(efx);
3135
	rtnl_unlock();
3136 3137 3138 3139
	if (rc)
		netif_warn(efx, probe, efx->net_dev,
			   "failed to create MTDs (%d)\n", rc);

3140 3141 3142 3143 3144
	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);

3145 3146 3147
	return 0;

 fail4:
3148
	efx_pci_remove_main(efx);
3149 3150 3151 3152 3153
 fail3:
	efx_fini_io(efx);
 fail2:
	efx_fini_struct(efx);
 fail1:
S
Steve Hodgson 已提交
3154
	WARN_ON(rc > 0);
3155
	netif_dbg(efx, drv, efx->net_dev, "initialisation failed. rc=%d\n", rc);
3156 3157 3158 3159
	free_netdev(net_dev);
	return rc;
}

3160 3161 3162 3163 3164 3165 3166 3167 3168 3169 3170 3171 3172 3173 3174 3175 3176 3177 3178 3179
/* 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

3180 3181 3182 3183
static int efx_pm_freeze(struct device *dev)
{
	struct efx_nic *efx = pci_get_drvdata(to_pci_dev(dev));

3184 3185
	rtnl_lock();

3186 3187
	if (efx->state != STATE_DISABLED) {
		efx->state = STATE_UNINIT;
3188

3189
		efx_device_detach_sync(efx);
3190

3191
		efx_stop_all(efx);
B
Ben Hutchings 已提交
3192
		efx_disable_interrupts(efx);
3193
	}
3194

3195 3196
	rtnl_unlock();

3197 3198 3199 3200 3201
	return 0;
}

static int efx_pm_thaw(struct device *dev)
{
3202
	int rc;
3203 3204
	struct efx_nic *efx = pci_get_drvdata(to_pci_dev(dev));

3205 3206
	rtnl_lock();

3207
	if (efx->state != STATE_DISABLED) {
3208 3209 3210
		rc = efx_enable_interrupts(efx);
		if (rc)
			goto fail;
3211

3212 3213 3214
		mutex_lock(&efx->mac_lock);
		efx->phy_op->reconfigure(efx);
		mutex_unlock(&efx->mac_lock);
3215

3216
		efx_start_all(efx);
3217

3218
		netif_device_attach(efx->net_dev);
3219

3220
		efx->state = STATE_READY;
3221

3222 3223
		efx->type->resume_wol(efx);
	}
3224

3225 3226
	rtnl_unlock();

3227 3228 3229
	/* Reschedule any quenched resets scheduled during efx_pm_freeze() */
	queue_work(reset_workqueue, &efx->reset_work);

3230
	return 0;
3231 3232 3233 3234 3235

fail:
	rtnl_unlock();

	return rc;
3236 3237 3238 3239 3240 3241 3242 3243 3244
}

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);

3245
	efx->reset_pending = 0;
3246 3247 3248 3249 3250 3251 3252 3253 3254 3255 3256 3257 3258 3259 3260 3261 3262 3263 3264 3265 3266 3267 3268 3269 3270 3271

	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;
3272 3273
	rc = efx_pm_thaw(dev);
	return rc;
3274 3275 3276 3277 3278 3279 3280 3281 3282 3283 3284 3285 3286
}

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;
}

3287
static const struct dev_pm_ops efx_pm_ops = {
3288 3289 3290 3291 3292 3293 3294 3295
	.suspend	= efx_pm_suspend,
	.resume		= efx_pm_resume,
	.freeze		= efx_pm_freeze,
	.thaw		= efx_pm_thaw,
	.poweroff	= efx_pm_poweroff,
	.restore	= efx_pm_resume,
};

3296 3297 3298 3299
/* 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.
 */
3300 3301
static pci_ers_result_t efx_io_error_detected(struct pci_dev *pdev,
					      enum pci_channel_state state)
3302 3303 3304 3305 3306 3307 3308 3309 3310 3311 3312 3313 3314 3315 3316 3317
{
	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
3318
		efx_disable_interrupts(efx);
3319 3320 3321 3322 3323 3324 3325 3326 3327 3328 3329 3330 3331 3332 3333 3334

		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;
}

3335
/* Fake a successful reset, which will be performed later in efx_io_resume. */
3336
static pci_ers_result_t efx_io_slot_reset(struct pci_dev *pdev)
3337 3338 3339 3340 3341 3342 3343 3344 3345 3346 3347 3348 3349 3350 3351 3352 3353 3354 3355 3356 3357 3358 3359 3360 3361 3362 3363 3364 3365 3366 3367 3368 3369 3370 3371 3372 3373 3374 3375 3376 3377 3378 3379 3380 3381 3382 3383 3384 3385 3386 3387 3388 3389 3390 3391 3392 3393 3394
{
	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,
};

3395
static struct pci_driver efx_pci_driver = {
3396
	.name		= KBUILD_MODNAME,
3397 3398 3399
	.id_table	= efx_pci_table,
	.probe		= efx_pci_probe,
	.remove		= efx_pci_remove,
3400
	.driver.pm	= &efx_pm_ops,
3401
	.err_handler	= &efx_err_handlers,
3402 3403 3404
#ifdef CONFIG_SFC_SRIOV
	.sriov_configure = efx_pci_sriov_configure,
#endif
3405 3406 3407 3408 3409 3410 3411 3412 3413 3414 3415 3416 3417 3418 3419 3420 3421 3422 3423 3424 3425 3426
};

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

3427
#ifdef CONFIG_SFC_SRIOV
3428 3429 3430
	rc = efx_init_sriov();
	if (rc)
		goto err_sriov;
3431
#endif
3432

3433 3434 3435 3436 3437
	reset_workqueue = create_singlethread_workqueue("sfc_reset");
	if (!reset_workqueue) {
		rc = -ENOMEM;
		goto err_reset;
	}
3438 3439 3440 3441 3442 3443 3444 3445

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

	return 0;

 err_pci:
3446 3447
	destroy_workqueue(reset_workqueue);
 err_reset:
3448
#ifdef CONFIG_SFC_SRIOV
3449 3450
	efx_fini_sriov();
 err_sriov:
3451
#endif
3452 3453 3454 3455 3456 3457 3458 3459 3460 3461
	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);
3462
	destroy_workqueue(reset_workqueue);
3463
#ifdef CONFIG_SFC_SRIOV
3464
	efx_fini_sriov();
3465
#endif
3466 3467 3468 3469 3470 3471 3472
	unregister_netdevice_notifier(&efx_netdev_notifier);

}

module_init(efx_init_module);
module_exit(efx_exit_module);

3473 3474
MODULE_AUTHOR("Solarflare Communications and "
	      "Michael Brown <mbrown@fensystems.co.uk>");
B
Ben Hutchings 已提交
3475
MODULE_DESCRIPTION("Solarflare network driver");
3476 3477
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, efx_pci_table);