efx.c 89.3 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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bool efx_separate_tx_channels;
module_param(efx_separate_tx_channels, bool, 0444);
MODULE_PARM_DESC(efx_separate_tx_channels,
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		 "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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	struct efx_tx_queue *tx_queue;
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	int spent;
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251
	if (unlikely(!channel->enabled))
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		return 0;
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	efx_for_each_channel_tx_queue(tx_queue, channel) {
		tx_queue->pkts_compl = 0;
		tx_queue->bytes_compl = 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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	/* Update BQL */
	efx_for_each_channel_tx_queue(tx_queue, channel) {
		if (tx_queue->bytes_compl) {
			netdev_tx_completed_queue(tx_queue->core_txq,
				tx_queue->pkts_compl, tx_queue->bytes_compl);
		}
	}

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	return spent;
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}

/* NAPI poll handler
 *
 * NAPI guarantees serialisation of polls of the same device, which
 * provides the guarantee required by efx_process_channel().
 */
static int efx_poll(struct napi_struct *napi, int budget)
{
	struct efx_channel *channel =
		container_of(napi, struct efx_channel, napi_str);
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	struct efx_nic *efx = channel->efx;
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	int spent;
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	if (!efx_channel_lock_napi(channel))
		return budget;

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

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		efx_filter_rfs_expire(channel);

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

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	efx_channel_unlock_napi(channel);
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	return spent;
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}

/* Create event queue
 * Event queue memory allocations are done only once.  If the channel
 * is reset, the memory buffer will be reused; this guards against
 * errors during channel reset and also simplifies interrupt handling.
 */
static int efx_probe_eventq(struct efx_channel *channel)
{
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	struct efx_nic *efx = channel->efx;
	unsigned long entries;

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	netif_dbg(efx, probe, efx->net_dev,
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		  "chan %d create event queue\n", channel->channel);
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	/* Build an event queue with room for one event per tx and rx buffer,
	 * plus some extra for link state events and MCDI completions. */
	entries = roundup_pow_of_two(efx->rxq_entries + efx->txq_entries + 128);
	EFX_BUG_ON_PARANOID(entries > EFX_MAX_EVQ_SIZE);
	channel->eventq_mask = max(entries, EFX_MIN_EVQ_SIZE) - 1;

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	return efx_nic_probe_eventq(channel);
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}

/* Prepare channel's event queue */
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static int efx_init_eventq(struct efx_channel *channel)
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{
362
	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
 *
 *************************************************************************/

432
/* Allocate and initialise a channel structure. */
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static struct efx_channel *
efx_alloc_channel(struct efx_nic *efx, int i, struct efx_channel *old_channel)
{
	struct efx_channel *channel;
	struct efx_rx_queue *rx_queue;
	struct efx_tx_queue *tx_queue;
	int j;

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	channel = kzalloc(sizeof(*channel), GFP_KERNEL);
	if (!channel)
		return NULL;
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	channel->efx = efx;
	channel->channel = i;
	channel->type = &efx_default_channel_type;
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	for (j = 0; j < EFX_TXQ_TYPES; j++) {
		tx_queue = &channel->tx_queue[j];
		tx_queue->efx = efx;
		tx_queue->queue = i * EFX_TXQ_TYPES + j;
		tx_queue->channel = channel;
	}
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	rx_queue = &channel->rx_queue;
	rx_queue->efx = efx;
	setup_timer(&rx_queue->slow_fill, efx_rx_slow_fill,
		    (unsigned long)rx_queue);
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	return channel;
}

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

	*channel = *old_channel;

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

	rx_queue = &channel->rx_queue;
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	rx_queue->buffer = NULL;
	memset(&rx_queue->rxd, 0, sizeof(rx_queue->rxd));
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	setup_timer(&rx_queue->slow_fill, efx_rx_slow_fill,
		    (unsigned long)rx_queue);

	return channel;
}

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

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	netif_dbg(channel->efx, probe, channel->efx->net_dev,
		  "creating channel %d\n", channel->channel);
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	rc = channel->type->pre_probe(channel);
	if (rc)
		goto fail;

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

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

	return 0;

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fail:
	efx_remove_channel(channel);
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	return rc;
}

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

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

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

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static int efx_probe_channels(struct efx_nic *efx)
{
	struct efx_channel *channel;
	int rc;

	/* Restart special buffer allocation */
	efx->next_buffer_table = 0;

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	/* Probe channels in reverse, so that any 'extra' channels
	 * use the start of the buffer table. This allows the traffic
	 * channels to be resized without moving them or wasting the
	 * entries before them.
	 */
	efx_for_each_channel_rev(channel, efx) {
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		rc = efx_probe_channel(channel);
		if (rc) {
			netif_err(efx, probe, efx->net_dev,
				  "failed to create channel %d\n",
				  channel->channel);
			goto fail;
		}
	}
	efx_set_channel_names(efx);

	return 0;

fail:
	efx_remove_channels(efx);
	return rc;
}

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/* Channels are shutdown and reinitialised whilst the NIC is running
 * to propagate configuration changes (mtu, checksum offload), or
 * to clear hardware error conditions
 */
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static void efx_start_datapath(struct efx_nic *efx)
602
{
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	bool old_rx_scatter = efx->rx_scatter;
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	struct efx_tx_queue *tx_queue;
	struct efx_rx_queue *rx_queue;
	struct efx_channel *channel;
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	size_t rx_buf_len;
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	/* Calculate the rx buffer allocation parameters required to
	 * support the current MTU, including padding for header
	 * alignment and overruns.
	 */
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	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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Jon Cooper 已提交
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		efx->rx_scatter = efx->type->always_rx_scatter;
620 621
		efx->rx_buffer_order = 0;
	} else if (efx->type->can_rx_scatter) {
622
		BUILD_BUG_ON(EFX_RX_USR_BUF_SIZE % L1_CACHE_BYTES);
623
		BUILD_BUG_ON(sizeof(struct efx_rx_page_state) +
624 625 626
			     2 * ALIGN(NET_IP_ALIGN + EFX_RX_USR_BUF_SIZE,
				       EFX_RX_BUF_ALIGNMENT) >
			     PAGE_SIZE);
627 628 629 630 631 632 633 634
		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);
	}

635 636 637 638 639 640 641 642 643 644 645
	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);
646

J
Jon Cooper 已提交
647
	/* RX filters may also have scatter-enabled flags */
648
	if (efx->rx_scatter != old_rx_scatter)
649
		efx->type->filter_update_rx_scatter(efx);
650

651 652 653 654 655 656 657 658 659 660
	/* 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;

661 662
	/* Initialise the channels */
	efx_for_each_channel(channel, efx) {
663
		efx_for_each_channel_tx_queue(tx_queue, channel) {
664
			efx_init_tx_queue(tx_queue);
665 666
			atomic_inc(&efx->active_queues);
		}
667

668
		efx_for_each_channel_rx_queue(rx_queue, channel) {
669
			efx_init_rx_queue(rx_queue);
670
			atomic_inc(&efx->active_queues);
671 672 673
			efx_stop_eventq(channel);
			efx_fast_push_rx_descriptors(rx_queue, false);
			efx_start_eventq(channel);
674
		}
675

676
		WARN_ON(channel->rx_pkt_n_frags);
677 678
	}

679 680
	efx_ptp_start_datapath(efx);

681 682
	if (netif_device_present(efx->net_dev))
		netif_tx_wake_all_queues(efx->net_dev);
683 684
}

685
static void efx_stop_datapath(struct efx_nic *efx)
686 687 688 689
{
	struct efx_channel *channel;
	struct efx_tx_queue *tx_queue;
	struct efx_rx_queue *rx_queue;
690
	int rc;
691 692 693 694

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

695 696
	efx_ptp_stop_datapath(efx);

697 698 699 700 701 702
	/* Stop RX refill */
	efx_for_each_channel(channel, efx) {
		efx_for_each_channel_rx_queue(rx_queue, channel)
			rx_queue->refill_enabled = false;
	}

703
	efx_for_each_channel(channel, efx) {
704 705 706 707 708 709 710 711 712 713
		/* 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);
		}
714
	}
715

716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733
	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) {
734 735
		efx_for_each_channel_rx_queue(rx_queue, channel)
			efx_fini_rx_queue(rx_queue);
736
		efx_for_each_possible_channel_tx_queue(tx_queue, channel)
737 738 739 740 741 742 743 744 745
			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;

746 747
	netif_dbg(channel->efx, drv, channel->efx->net_dev,
		  "destroy chan %d\n", channel->channel);
748 749 750

	efx_for_each_channel_rx_queue(rx_queue, channel)
		efx_remove_rx_queue(rx_queue);
751
	efx_for_each_possible_channel_tx_queue(tx_queue, channel)
752 753
		efx_remove_tx_queue(tx_queue);
	efx_remove_eventq(channel);
754
	channel->type->post_remove(channel);
755 756
}

757 758 759 760 761 762 763 764 765 766 767 768 769
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;
770
	unsigned i, next_buffer_table = 0;
771
	int rc, rc2;
772 773 774 775

	rc = efx_check_disabled(efx);
	if (rc)
		return rc;
776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797

	/* 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);
	}
798

799
	efx_device_detach_sync(efx);
800
	efx_stop_all(efx);
B
Ben Hutchings 已提交
801
	efx_soft_disable_interrupts(efx);
802

803
	/* Clone channels (where possible) */
804 805
	memset(other_channel, 0, sizeof(other_channel));
	for (i = 0; i < efx->n_channels; i++) {
806 807 808
		channel = efx->channel[i];
		if (channel->type->copy)
			channel = channel->type->copy(channel);
809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826
		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;
	}

827 828
	/* Restart buffer table allocation */
	efx->next_buffer_table = next_buffer_table;
829 830

	for (i = 0; i < efx->n_channels; i++) {
831 832 833 834 835 836 837
		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]);
838
	}
839

840
out:
841 842 843 844 845 846 847 848 849
	/* 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);
		}
	}
850

851 852 853 854 855 856 857 858 859 860
	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);
	}
861 862 863 864 865 866 867 868 869 870 871 872 873 874
	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;
}

875
void efx_schedule_slow_fill(struct efx_rx_queue *rx_queue)
876
{
877
	mod_timer(&rx_queue->slow_fill, jiffies + msecs_to_jiffies(100));
878 879
}

880 881
static const struct efx_channel_type efx_default_channel_type = {
	.pre_probe		= efx_channel_dummy_op_int,
882
	.post_remove		= efx_channel_dummy_op_void,
883 884 885 886 887 888 889 890 891 892
	.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;
}

893 894 895 896
void efx_channel_dummy_op_void(struct efx_channel *channel)
{
}

897 898 899 900 901 902 903 904 905 906
/**************************************************************************
 *
 * 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
907
void efx_link_status_changed(struct efx_nic *efx)
908
{
909 910
	struct efx_link_state *link_state = &efx->link_state;

911 912 913 914 915 916 917
	/* 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;

918
	if (link_state->up != netif_carrier_ok(efx->net_dev)) {
919 920
		efx->n_link_state_changes++;

921
		if (link_state->up)
922 923 924 925 926 927
			netif_carrier_on(efx->net_dev);
		else
			netif_carrier_off(efx->net_dev);
	}

	/* Status message for kernel log */
B
Ben Hutchings 已提交
928
	if (link_state->up)
929
		netif_info(efx, link, efx->net_dev,
930
			   "link up at %uMbps %s-duplex (MTU %d)\n",
931
			   link_state->speed, link_state->fd ? "full" : "half",
932
			   efx->net_dev->mtu);
B
Ben Hutchings 已提交
933
	else
934
		netif_info(efx, link, efx->net_dev, "link down\n");
935 936
}

B
Ben Hutchings 已提交
937 938 939 940 941 942 943 944 945 946 947 948 949
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;
	}
}

950
void efx_link_set_wanted_fc(struct efx_nic *efx, u8 wanted_fc)
B
Ben Hutchings 已提交
951 952 953 954 955 956 957 958 959 960 961 962 963 964
{
	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;
	}
}

965 966
static void efx_fini_port(struct efx_nic *efx);

967 968 969 970 971 972 973 974 975 976
/* 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
977 978 979 980 981 982 983 984
/* 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)
985
{
B
Ben Hutchings 已提交
986 987
	enum efx_phy_mode phy_mode;
	int rc;
988

B
Ben Hutchings 已提交
989
	WARN_ON(!mutex_is_locked(&efx->mac_lock));
990

B
Ben Hutchings 已提交
991 992
	/* Disable PHY transmit in mac level loopbacks */
	phy_mode = efx->phy_mode;
993 994 995 996 997
	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
998
	rc = efx->type->reconfigure_port(efx);
999

B
Ben Hutchings 已提交
1000 1001
	if (rc)
		efx->phy_mode = phy_mode;
1002

B
Ben Hutchings 已提交
1003
	return rc;
1004 1005 1006 1007
}

/* Reinitialise the MAC to pick up new PHY settings, even if the port is
 * disabled. */
B
Ben Hutchings 已提交
1008
int efx_reconfigure_port(struct efx_nic *efx)
1009
{
B
Ben Hutchings 已提交
1010 1011
	int rc;

1012 1013 1014
	EFX_ASSERT_RESET_SERIALISED(efx);

	mutex_lock(&efx->mac_lock);
B
Ben Hutchings 已提交
1015
	rc = __efx_reconfigure_port(efx);
1016
	mutex_unlock(&efx->mac_lock);
B
Ben Hutchings 已提交
1017 1018

	return rc;
1019 1020
}

1021 1022 1023
/* Asynchronous work item for changing MAC promiscuity and multicast
 * hash.  Avoid a drain/rx_ingress enable by reconfiguring the current
 * MAC directly. */
1024 1025 1026 1027 1028
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);
1029
	if (efx->port_enabled)
1030
		efx_mac_reconfigure(efx);
1031 1032 1033
	mutex_unlock(&efx->mac_lock);
}

1034 1035 1036 1037
static int efx_probe_port(struct efx_nic *efx)
{
	int rc;

1038
	netif_dbg(efx, probe, efx->net_dev, "create port\n");
1039

1040 1041 1042
	if (phy_flash_cfg)
		efx->phy_mode = PHY_MODE_SPECIAL;

1043 1044
	/* Connect up MAC/PHY operations table */
	rc = efx->type->probe_port(efx);
1045
	if (rc)
1046
		return rc;
1047

1048
	/* Initialise MAC address to permanent address */
1049
	ether_addr_copy(efx->net_dev->dev_addr, efx->net_dev->perm_addr);
1050 1051 1052 1053 1054 1055 1056 1057

	return 0;
}

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

1058
	netif_dbg(efx, drv, efx->net_dev, "init port\n");
1059

1060 1061
	mutex_lock(&efx->mac_lock);

1062
	rc = efx->phy_op->init(efx);
1063
	if (rc)
1064
		goto fail1;
1065

1066
	efx->port_initialized = true;
1067

B
Ben Hutchings 已提交
1068 1069
	/* Reconfigure the MAC before creating dma queues (required for
	 * Falcon/A1 where RX_INGR_EN/TX_DRAIN_EN isn't supported) */
1070
	efx_mac_reconfigure(efx);
B
Ben Hutchings 已提交
1071 1072 1073

	/* Ensure the PHY advertises the correct flow control settings */
	rc = efx->phy_op->reconfigure(efx);
1074
	if (rc && rc != -EPERM)
B
Ben Hutchings 已提交
1075 1076
		goto fail2;

1077
	mutex_unlock(&efx->mac_lock);
1078
	return 0;
1079

1080
fail2:
1081
	efx->phy_op->fini(efx);
1082 1083
fail1:
	mutex_unlock(&efx->mac_lock);
1084
	return rc;
1085 1086 1087 1088
}

static void efx_start_port(struct efx_nic *efx)
{
1089
	netif_dbg(efx, ifup, efx->net_dev, "start port\n");
1090 1091 1092
	BUG_ON(efx->port_enabled);

	mutex_lock(&efx->mac_lock);
1093
	efx->port_enabled = true;
1094

1095
	/* Ensure MAC ingress/egress is enabled */
1096
	efx_mac_reconfigure(efx);
1097

1098 1099 1100
	mutex_unlock(&efx->mac_lock);
}

1101 1102 1103 1104 1105
/* 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.
 */
1106 1107
static void efx_stop_port(struct efx_nic *efx)
{
1108
	netif_dbg(efx, ifdown, efx->net_dev, "stop port\n");
1109

1110 1111
	EFX_ASSERT_RESET_SERIALISED(efx);

1112
	mutex_lock(&efx->mac_lock);
1113
	efx->port_enabled = false;
1114 1115 1116
	mutex_unlock(&efx->mac_lock);

	/* Serialise against efx_set_multicast_list() */
1117 1118
	netif_addr_lock_bh(efx->net_dev);
	netif_addr_unlock_bh(efx->net_dev);
1119 1120 1121 1122

	cancel_delayed_work_sync(&efx->monitor_work);
	efx_selftest_async_cancel(efx);
	cancel_work_sync(&efx->mac_work);
1123 1124 1125 1126
}

static void efx_fini_port(struct efx_nic *efx)
{
1127
	netif_dbg(efx, drv, efx->net_dev, "shut down port\n");
1128 1129 1130 1131

	if (!efx->port_initialized)
		return;

1132
	efx->phy_op->fini(efx);
1133
	efx->port_initialized = false;
1134

1135
	efx->link_state.up = false;
1136 1137 1138 1139 1140
	efx_link_status_changed(efx);
}

static void efx_remove_port(struct efx_nic *efx)
{
1141
	netif_dbg(efx, drv, efx->net_dev, "destroying port\n");
1142

1143
	efx->type->remove_port(efx);
1144 1145 1146 1147 1148 1149 1150 1151
}

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

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 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222
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;
	}
}

1223 1224 1225 1226 1227
/* 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;
1228
	unsigned int mem_map_size = efx->type->mem_map_size(efx);
1229
	int rc, bar;
1230

1231
	netif_dbg(efx, probe, efx->net_dev, "initialising I/O\n");
1232

1233 1234
	bar = efx->type->mem_bar;

1235 1236
	rc = pci_enable_device(pci_dev);
	if (rc) {
1237 1238
		netif_err(efx, probe, efx->net_dev,
			  "failed to enable PCI device\n");
1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249
		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) {
C
Christoph Hellwig 已提交
1250 1251 1252
		rc = dma_set_mask_and_coherent(&pci_dev->dev, dma_mask);
		if (rc == 0)
			break;
1253 1254 1255
		dma_mask >>= 1;
	}
	if (rc) {
1256 1257
		netif_err(efx, probe, efx->net_dev,
			  "could not find a suitable DMA mask\n");
1258 1259
		goto fail2;
	}
1260 1261
	netif_dbg(efx, probe, efx->net_dev,
		  "using DMA mask %llx\n", (unsigned long long) dma_mask);
1262

1263 1264
	efx->membase_phys = pci_resource_start(efx->pci_dev, bar);
	rc = pci_request_region(pci_dev, bar, "sfc");
1265
	if (rc) {
1266 1267
		netif_err(efx, probe, efx->net_dev,
			  "request for memory BAR failed\n");
1268 1269 1270
		rc = -EIO;
		goto fail3;
	}
1271
	efx->membase = ioremap_nocache(efx->membase_phys, mem_map_size);
1272
	if (!efx->membase) {
1273 1274
		netif_err(efx, probe, efx->net_dev,
			  "could not map memory BAR at %llx+%x\n",
1275
			  (unsigned long long)efx->membase_phys, mem_map_size);
1276 1277 1278
		rc = -ENOMEM;
		goto fail4;
	}
1279 1280
	netif_dbg(efx, probe, efx->net_dev,
		  "memory BAR at %llx+%x (virtual %p)\n",
1281 1282
		  (unsigned long long)efx->membase_phys, mem_map_size,
		  efx->membase);
1283 1284 1285 1286

	return 0;

 fail4:
1287
	pci_release_region(efx->pci_dev, bar);
1288
 fail3:
1289
	efx->membase_phys = 0;
1290 1291 1292 1293 1294 1295 1296 1297
 fail2:
	pci_disable_device(efx->pci_dev);
 fail1:
	return rc;
}

static void efx_fini_io(struct efx_nic *efx)
{
1298 1299
	int bar;

1300
	netif_dbg(efx, drv, efx->net_dev, "shutting down I/O\n");
1301 1302 1303 1304 1305 1306 1307

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

	if (efx->membase_phys) {
1308 1309
		bar = efx->type->mem_bar;
		pci_release_region(efx->pci_dev, bar);
1310
		efx->membase_phys = 0;
1311 1312
	}

1313 1314 1315
	/* Don't disable bus-mastering if VFs are assigned */
	if (!pci_vfs_assigned(efx->pci_dev))
		pci_disable_device(efx->pci_dev);
1316 1317
}

1318 1319 1320 1321 1322 1323 1324
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);
1325 1326
}

1327
static unsigned int efx_wanted_parallelism(struct efx_nic *efx)
1328
{
1329
	cpumask_var_t thread_mask;
1330
	unsigned int count;
1331
	int cpu;
1332

1333 1334 1335 1336 1337 1338 1339 1340
	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;
		}
1341

1342 1343 1344 1345 1346
		count = 0;
		for_each_online_cpu(cpu) {
			if (!cpumask_test_cpu(cpu, thread_mask)) {
				++count;
				cpumask_or(thread_mask, thread_mask,
1347
					   topology_sibling_cpumask(cpu));
1348 1349 1350 1351
			}
		}

		free_cpumask_var(thread_mask);
R
Rusty Russell 已提交
1352 1353
	}

1354 1355 1356
	/* If RSS is requested for the PF *and* VFs then we can't write RSS
	 * table entries that are inaccessible to VFs
	 */
1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367
#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);
		}
1368
	}
1369
#endif
1370 1371 1372 1373 1374 1375 1376

	return count;
}

/* Probe the number and type of interrupts we are able to obtain, and
 * the resulting numbers of channels and RX queues.
 */
1377
static int efx_probe_interrupts(struct efx_nic *efx)
1378
{
1379 1380
	unsigned int extra_channels = 0;
	unsigned int i, j;
1381
	int rc;
1382

1383 1384 1385 1386
	for (i = 0; i < EFX_MAX_EXTRA_CHANNELS; i++)
		if (efx->extra_channel_type[i])
			++extra_channels;

1387
	if (efx->interrupt_mode == EFX_INT_MODE_MSIX) {
1388
		struct msix_entry xentries[EFX_MAX_CHANNELS];
1389
		unsigned int n_channels;
1390

1391
		n_channels = efx_wanted_parallelism(efx);
1392
		if (efx_separate_tx_channels)
B
Ben Hutchings 已提交
1393
			n_channels *= 2;
1394
		n_channels += extra_channels;
1395
		n_channels = min(n_channels, efx->max_channels);
1396

B
Ben Hutchings 已提交
1397
		for (i = 0; i < n_channels; i++)
1398
			xentries[i].entry = i;
1399 1400 1401 1402 1403 1404 1405 1406
		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) {
1407 1408
			netif_err(efx, drv, efx->net_dev,
				  "WARNING: Insufficient MSI-X vectors"
1409
				  " available (%d < %u).\n", rc, n_channels);
1410 1411
			netif_err(efx, drv, efx->net_dev,
				  "WARNING: Performance may be reduced.\n");
B
Ben Hutchings 已提交
1412
			n_channels = rc;
1413 1414
		}

1415
		if (rc > 0) {
B
Ben Hutchings 已提交
1416
			efx->n_channels = n_channels;
1417 1418
			if (n_channels > extra_channels)
				n_channels -= extra_channels;
1419 1420 1421 1422
			if (efx_separate_tx_channels) {
				efx->n_tx_channels = min(max(n_channels / 2,
							     1U),
							 efx->max_tx_channels);
1423 1424 1425
				efx->n_rx_channels = max(n_channels -
							 efx->n_tx_channels,
							 1U);
B
Ben Hutchings 已提交
1426
			} else {
1427 1428
				efx->n_tx_channels = min(n_channels,
							 efx->max_tx_channels);
1429
				efx->n_rx_channels = n_channels;
B
Ben Hutchings 已提交
1430
			}
1431
			for (i = 0; i < efx->n_channels; i++)
1432 1433
				efx_get_channel(efx, i)->irq =
					xentries[i].vector;
1434 1435 1436 1437 1438
		}
	}

	/* Try single interrupt MSI */
	if (efx->interrupt_mode == EFX_INT_MODE_MSI) {
1439
		efx->n_channels = 1;
B
Ben Hutchings 已提交
1440 1441
		efx->n_rx_channels = 1;
		efx->n_tx_channels = 1;
1442 1443
		rc = pci_enable_msi(efx->pci_dev);
		if (rc == 0) {
1444
			efx_get_channel(efx, 0)->irq = efx->pci_dev->irq;
1445
		} else {
1446 1447
			netif_err(efx, drv, efx->net_dev,
				  "could not enable MSI\n");
1448 1449 1450 1451 1452 1453
			efx->interrupt_mode = EFX_INT_MODE_LEGACY;
		}
	}

	/* Assume legacy interrupts */
	if (efx->interrupt_mode == EFX_INT_MODE_LEGACY) {
1454
		efx->n_channels = 1 + (efx_separate_tx_channels ? 1 : 0);
B
Ben Hutchings 已提交
1455 1456
		efx->n_rx_channels = 1;
		efx->n_tx_channels = 1;
1457 1458
		efx->legacy_irq = efx->pci_dev->irq;
	}
1459

1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474
	/* 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];
		}
	}

1475
	/* RSS might be usable on VFs even if it is disabled on the PF */
1476 1477 1478 1479 1480 1481 1482 1483 1484
#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;
1485

1486
	return 0;
1487 1488
}

1489
static int efx_soft_enable_interrupts(struct efx_nic *efx)
1490
{
1491 1492
	struct efx_channel *channel, *end_channel;
	int rc;
1493

1494 1495
	BUG_ON(efx->state == STATE_DISABLED);

B
Ben Hutchings 已提交
1496 1497
	efx->irq_soft_enabled = true;
	smp_wmb();
1498 1499

	efx_for_each_channel(channel, efx) {
1500 1501 1502 1503 1504
		if (!channel->type->keep_eventq) {
			rc = efx_init_eventq(channel);
			if (rc)
				goto fail;
		}
1505 1506 1507 1508
		efx_start_eventq(channel);
	}

	efx_mcdi_mode_event(efx);
1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521

	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;
1522 1523
}

B
Ben Hutchings 已提交
1524
static void efx_soft_disable_interrupts(struct efx_nic *efx)
1525 1526 1527
{
	struct efx_channel *channel;

1528 1529 1530
	if (efx->state == STATE_DISABLED)
		return;

1531 1532
	efx_mcdi_mode_poll(efx);

B
Ben Hutchings 已提交
1533 1534 1535 1536
	efx->irq_soft_enabled = false;
	smp_wmb();

	if (efx->legacy_irq)
1537 1538 1539 1540 1541 1542 1543
		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
1544
		if (!channel->type->keep_eventq)
1545
			efx_fini_eventq(channel);
1546
	}
1547 1548 1549

	/* Flush the asynchronous MCDI request queue */
	efx_mcdi_flush_async(efx);
1550 1551
}

1552
static int efx_enable_interrupts(struct efx_nic *efx)
B
Ben Hutchings 已提交
1553
{
1554 1555
	struct efx_channel *channel, *end_channel;
	int rc;
B
Ben Hutchings 已提交
1556 1557 1558 1559 1560 1561 1562 1563

	BUG_ON(efx->state == STATE_DISABLED);

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

1564
	efx->type->irq_enable_master(efx);
B
Ben Hutchings 已提交
1565 1566

	efx_for_each_channel(channel, efx) {
1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584
		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
1585
		if (channel->type->keep_eventq)
1586
			efx_fini_eventq(channel);
B
Ben Hutchings 已提交
1587 1588
	}

1589 1590 1591
	efx->type->irq_disable_non_ev(efx);

	return rc;
B
Ben Hutchings 已提交
1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604
}

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);
	}

1605
	efx->type->irq_disable_non_ev(efx);
B
Ben Hutchings 已提交
1606 1607
}

1608 1609 1610 1611 1612
static void efx_remove_interrupts(struct efx_nic *efx)
{
	struct efx_channel *channel;

	/* Remove MSI/MSI-X interrupts */
1613
	efx_for_each_channel(channel, efx)
1614 1615 1616 1617 1618 1619 1620 1621
		channel->irq = 0;
	pci_disable_msi(efx->pci_dev);
	pci_disable_msix(efx->pci_dev);

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

1622
static void efx_set_channels(struct efx_nic *efx)
1623
{
1624 1625 1626
	struct efx_channel *channel;
	struct efx_tx_queue *tx_queue;

1627
	efx->tx_channel_offset =
1628 1629
		efx_separate_tx_channels ?
		efx->n_channels - efx->n_tx_channels : 0;
1630

1631 1632
	/* We need to mark which channels really have RX and TX
	 * queues, and adjust the TX queue numbers if we have separate
1633 1634 1635
	 * RX-only and TX-only channels.
	 */
	efx_for_each_channel(channel, efx) {
1636 1637 1638 1639 1640
		if (channel->channel < efx->n_rx_channels)
			channel->rx_queue.core_index = channel->channel;
		else
			channel->rx_queue.core_index = -1;

1641 1642 1643 1644
		efx_for_each_channel_tx_queue(tx_queue, channel)
			tx_queue->queue -= (efx->tx_channel_offset *
					    EFX_TXQ_TYPES);
	}
1645 1646 1647 1648 1649 1650
}

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

1651
	netif_dbg(efx, probe, efx->net_dev, "creating NIC\n");
1652 1653

	/* Carry out hardware-type specific initialisation */
1654
	rc = efx->type->probe(efx);
1655 1656 1657
	if (rc)
		return rc;

1658 1659 1660 1661 1662 1663 1664 1665
	do {
		if (!efx->max_channels || !efx->max_tx_channels) {
			netif_err(efx, drv, efx->net_dev,
				  "Insufficient resources to allocate"
				  " any channels\n");
			rc = -ENOSPC;
			goto fail1;
		}
1666

1667 1668 1669 1670 1671 1672
		/* Determine the number of channels and queues by trying
		 * to hook in MSI-X interrupts.
		 */
		rc = efx_probe_interrupts(efx);
		if (rc)
			goto fail1;
1673

1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685
		efx_set_channels(efx);

		/* dimension_resources can fail with EAGAIN */
		rc = efx->type->dimension_resources(efx);
		if (rc != 0 && rc != -EAGAIN)
			goto fail2;

		if (rc == -EAGAIN)
			/* try again with new max_channels */
			efx_remove_interrupts(efx);

	} while (rc == -EAGAIN);
1686

1687
	if (efx->n_channels > 1)
1688 1689 1690
		netdev_rss_key_fill(&efx->rx_hash_key,
				    sizeof(efx->rx_hash_key));
	efx_set_default_rx_indir_table(efx);
1691

1692 1693
	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);
1694 1695

	/* Initialise the interrupt moderation settings */
1696 1697
	efx_init_irq_moderation(efx, tx_irq_mod_usec, rx_irq_mod_usec, true,
				true);
1698 1699

	return 0;
1700

1701 1702 1703
fail2:
	efx_remove_interrupts(efx);
fail1:
1704 1705
	efx->type->remove(efx);
	return rc;
1706 1707 1708 1709
}

static void efx_remove_nic(struct efx_nic *efx)
{
1710
	netif_dbg(efx, drv, efx->net_dev, "destroying NIC\n");
1711 1712

	efx_remove_interrupts(efx);
1713
	efx->type->remove(efx);
1714 1715
}

1716 1717 1718 1719 1720
static int efx_probe_filters(struct efx_nic *efx)
{
	int rc;

	spin_lock_init(&efx->filter_lock);
1721 1722
	init_rwsem(&efx->filter_sem);
	down_write(&efx->filter_sem);
1723 1724
	rc = efx->type->filter_table_probe(efx);
	if (rc)
1725
		goto out_unlock;
1726 1727 1728 1729 1730 1731 1732 1733

#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);
1734 1735
			rc = -ENOMEM;
			goto out_unlock;
1736 1737 1738
		}
	}
#endif
1739 1740 1741
out_unlock:
	up_write(&efx->filter_sem);
	return rc;
1742 1743 1744 1745 1746 1747 1748
}

static void efx_remove_filters(struct efx_nic *efx)
{
#ifdef CONFIG_RFS_ACCEL
	kfree(efx->rps_flow_id);
#endif
1749
	down_write(&efx->filter_sem);
1750
	efx->type->filter_table_remove(efx);
1751
	up_write(&efx->filter_sem);
1752 1753 1754 1755
}

static void efx_restore_filters(struct efx_nic *efx)
{
1756
	down_read(&efx->filter_sem);
1757
	efx->type->filter_table_restore(efx);
1758
	up_read(&efx->filter_sem);
1759 1760
}

1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772
/**************************************************************************
 *
 * NIC startup/shutdown
 *
 *************************************************************************/

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

	rc = efx_probe_nic(efx);
	if (rc) {
1773
		netif_err(efx, probe, efx->net_dev, "failed to create NIC\n");
1774 1775 1776 1777 1778
		goto fail1;
	}

	rc = efx_probe_port(efx);
	if (rc) {
1779
		netif_err(efx, probe, efx->net_dev, "failed to create port\n");
1780 1781 1782
		goto fail2;
	}

1783 1784 1785 1786 1787
	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;
	}
1788
	efx->rxq_entries = efx->txq_entries = EFX_DEFAULT_DMAQ_SIZE;
1789

1790 1791 1792 1793 1794 1795 1796 1797
#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
1798 1799 1800 1801
	rc = efx_probe_filters(efx);
	if (rc) {
		netif_err(efx, probe, efx->net_dev,
			  "failed to create filter tables\n");
1802
		goto fail4;
B
Ben Hutchings 已提交
1803 1804
	}

1805 1806
	rc = efx_probe_channels(efx);
	if (rc)
1807
		goto fail5;
1808

1809 1810
	return 0;

1811
 fail5:
1812
	efx_remove_filters(efx);
1813 1814 1815 1816
 fail4:
#ifdef CONFIG_SFC_SRIOV
	efx->type->vswitching_remove(efx);
#endif
1817 1818 1819 1820 1821 1822 1823 1824
 fail3:
	efx_remove_port(efx);
 fail2:
	efx_remove_nic(efx);
 fail1:
	return rc;
}

1825 1826 1827 1828 1829 1830
/* 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.
1831
 */
1832 1833 1834
static void efx_start_all(struct efx_nic *efx)
{
	EFX_ASSERT_RESET_SERIALISED(efx);
1835
	BUG_ON(efx->state == STATE_DISABLED);
1836 1837 1838

	/* Check that it is appropriate to restart the interface. All
	 * of these flags are safe to read under just the rtnl lock */
1839 1840
	if (efx->port_enabled || !netif_running(efx->net_dev) ||
	    efx->reset_pending)
1841 1842 1843
		return;

	efx_start_port(efx);
1844
	efx_start_datapath(efx);
1845

1846 1847
	/* Start the hardware monitor if there is one */
	if (efx->type->monitor != NULL)
1848 1849
		queue_delayed_work(efx->workqueue, &efx->monitor_work,
				   efx_monitor_interval);
1850 1851 1852 1853 1854

	/* 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) {
1855 1856 1857 1858 1859
		mutex_lock(&efx->mac_lock);
		if (efx->phy_op->poll(efx))
			efx_link_status_changed(efx);
		mutex_unlock(&efx->mac_lock);
	}
1860

1861
	efx->type->start_stats(efx);
1862 1863 1864 1865
	efx->type->pull_stats(efx);
	spin_lock_bh(&efx->stats_lock);
	efx->type->update_stats(efx, NULL, NULL);
	spin_unlock_bh(&efx->stats_lock);
1866 1867
}

1868 1869 1870 1871 1872
/* 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.
 */
1873 1874 1875 1876 1877 1878 1879 1880
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;

1881 1882 1883 1884 1885 1886 1887
	/* 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);
1888
	efx->type->stop_stats(efx);
1889 1890
	efx_stop_port(efx);

1891 1892 1893 1894 1895 1896
	/* 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));
1897 1898 1899
	netif_tx_disable(efx->net_dev);

	efx_stop_datapath(efx);
1900 1901 1902 1903
}

static void efx_remove_all(struct efx_nic *efx)
{
1904
	efx_remove_channels(efx);
1905
	efx_remove_filters(efx);
1906 1907 1908
#ifdef CONFIG_SFC_SRIOV
	efx->type->vswitching_remove(efx);
#endif
1909 1910 1911 1912 1913 1914 1915 1916 1917 1918
	efx_remove_port(efx);
	efx_remove_nic(efx);
}

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

1919
static unsigned int irq_mod_ticks(unsigned int usecs, unsigned int quantum_ns)
1920
{
1921 1922
	if (usecs == 0)
		return 0;
1923
	if (usecs * 1000 < quantum_ns)
1924
		return 1; /* never round down to 0 */
1925
	return usecs * 1000 / quantum_ns;
1926 1927
}

1928
/* Set interrupt moderation parameters */
1929 1930 1931
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)
1932
{
1933
	struct efx_channel *channel;
1934 1935 1936 1937 1938
	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;
1939 1940 1941

	EFX_ASSERT_RESET_SERIALISED(efx);

1942
	if (tx_usecs > irq_mod_max || rx_usecs > irq_mod_max)
1943 1944
		return -EINVAL;

1945 1946 1947
	tx_ticks = irq_mod_ticks(tx_usecs, efx->timer_quantum_ns);
	rx_ticks = irq_mod_ticks(rx_usecs, efx->timer_quantum_ns);

1948 1949 1950 1951 1952 1953 1954
	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;
	}

1955
	efx->irq_rx_adaptive = rx_adaptive;
1956
	efx->irq_rx_moderation = rx_ticks;
1957
	efx_for_each_channel(channel, efx) {
1958
		if (efx_channel_has_rx_queue(channel))
1959
			channel->irq_moderation = rx_ticks;
1960
		else if (efx_channel_has_tx_queues(channel))
1961 1962
			channel->irq_moderation = tx_ticks;
	}
1963 1964

	return 0;
1965 1966
}

1967 1968 1969
void efx_get_irq_moderation(struct efx_nic *efx, unsigned int *tx_usecs,
			    unsigned int *rx_usecs, bool *rx_adaptive)
{
1970 1971 1972 1973
	/* We must round up when converting ticks to microseconds
	 * because we round down when converting the other way.
	 */

1974
	*rx_adaptive = efx->irq_rx_adaptive;
1975 1976 1977
	*rx_usecs = DIV_ROUND_UP(efx->irq_rx_moderation *
				 efx->timer_quantum_ns,
				 1000);
1978 1979 1980 1981 1982 1983 1984 1985

	/* 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
1986
		*tx_usecs = DIV_ROUND_UP(
1987
			efx->channel[efx->tx_channel_offset]->irq_moderation *
1988 1989
			efx->timer_quantum_ns,
			1000);
1990 1991
}

1992 1993 1994 1995 1996 1997
/**************************************************************************
 *
 * Hardware monitor
 *
 **************************************************************************/

1998
/* Run periodically off the general workqueue */
1999 2000 2001 2002 2003
static void efx_monitor(struct work_struct *data)
{
	struct efx_nic *efx = container_of(data, struct efx_nic,
					   monitor_work.work);

2004 2005 2006
	netif_vdbg(efx, timer, efx->net_dev,
		   "hardware monitor executing on CPU %d\n",
		   raw_smp_processor_id());
2007
	BUG_ON(efx->type->monitor == NULL);
2008 2009 2010

	/* If the mac_lock is already held then it is likely a port
	 * reconfiguration is already in place, which will likely do
2011 2012 2013 2014 2015 2016
	 * 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);
	}
2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032

	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)
{
2033
	struct efx_nic *efx = netdev_priv(net_dev);
2034
	struct mii_ioctl_data *data = if_mii(ifr);
2035

2036
	if (cmd == SIOCSHWTSTAMP)
2037 2038 2039
		return efx_ptp_set_ts_config(efx, ifr);
	if (cmd == SIOCGHWTSTAMP)
		return efx_ptp_get_ts_config(efx, ifr);
2040

2041 2042 2043 2044 2045 2046
	/* 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);
2047 2048 2049 2050 2051 2052 2053 2054
}

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

2055 2056 2057 2058 2059 2060 2061
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);
2062
	napi_hash_add(&channel->napi_str);
2063
	efx_channel_busy_poll_init(channel);
2064 2065
}

2066
static void efx_init_napi(struct efx_nic *efx)
2067 2068 2069
{
	struct efx_channel *channel;

2070 2071
	efx_for_each_channel(channel, efx)
		efx_init_napi_channel(channel);
2072 2073 2074 2075
}

static void efx_fini_napi_channel(struct efx_channel *channel)
{
2076
	if (channel->napi_dev) {
2077
		netif_napi_del(&channel->napi_str);
2078 2079
		napi_hash_del(&channel->napi_str);
	}
2080
	channel->napi_dev = NULL;
2081 2082 2083 2084 2085 2086
}

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

2087 2088
	efx_for_each_channel(channel, efx)
		efx_fini_napi_channel(channel);
2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104
}

/**************************************************************************
 *
 * 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)
{
2105
	struct efx_nic *efx = netdev_priv(net_dev);
2106 2107
	struct efx_channel *channel;

2108
	efx_for_each_channel(channel, efx)
2109 2110 2111 2112 2113
		efx_schedule_channel(channel);
}

#endif

2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125
#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;

2126
	if (!efx_channel_try_lock_poll(channel))
2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144
		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

2145 2146 2147 2148 2149 2150 2151
/**************************************************************************
 *
 * Kernel net device interface
 *
 *************************************************************************/

/* Context: process, rtnl_lock() held. */
2152
int efx_net_open(struct net_device *net_dev)
2153
{
2154
	struct efx_nic *efx = netdev_priv(net_dev);
2155 2156
	int rc;

2157 2158
	netif_dbg(efx, ifup, efx->net_dev, "opening device on CPU %d\n",
		  raw_smp_processor_id());
2159

2160 2161 2162
	rc = efx_check_disabled(efx);
	if (rc)
		return rc;
2163 2164
	if (efx->phy_mode & PHY_MODE_SPECIAL)
		return -EBUSY;
2165 2166
	if (efx_mcdi_poll_reboot(efx) && efx_reset(efx, RESET_TYPE_ALL))
		return -EIO;
2167

2168 2169 2170 2171
	/* Notify the kernel of the link state polled during driver load,
	 * before the monitor starts running */
	efx_link_status_changed(efx);

2172
	efx_start_all(efx);
2173
	efx_selftest_async_start(efx);
2174 2175 2176 2177 2178 2179 2180
	return 0;
}

/* Context: process, rtnl_lock() held.
 * Note that the kernel will ignore our return code; this method
 * should really be a void.
 */
2181
int efx_net_stop(struct net_device *net_dev)
2182
{
2183
	struct efx_nic *efx = netdev_priv(net_dev);
2184

2185 2186
	netif_dbg(efx, ifdown, efx->net_dev, "closing on CPU %d\n",
		  raw_smp_processor_id());
2187

2188 2189
	/* Stop the device and flush all the channels */
	efx_stop_all(efx);
2190 2191 2192 2193

	return 0;
}

2194
/* Context: process, dev_base_lock or RTNL held, non-blocking. */
B
Ben Hutchings 已提交
2195 2196
static struct rtnl_link_stats64 *efx_net_stats(struct net_device *net_dev,
					       struct rtnl_link_stats64 *stats)
2197
{
2198
	struct efx_nic *efx = netdev_priv(net_dev);
2199

2200
	spin_lock_bh(&efx->stats_lock);
2201
	efx->type->update_stats(efx, NULL, stats);
2202 2203
	spin_unlock_bh(&efx->stats_lock);

2204 2205 2206 2207 2208 2209
	return stats;
}

/* Context: netif_tx_lock held, BHs disabled. */
static void efx_watchdog(struct net_device *net_dev)
{
2210
	struct efx_nic *efx = netdev_priv(net_dev);
2211

2212 2213 2214
	netif_err(efx, tx_err, efx->net_dev,
		  "TX stuck with port_enabled=%d: resetting channels\n",
		  efx->port_enabled);
2215

2216
	efx_schedule_reset(efx, RESET_TYPE_TX_WATCHDOG);
2217 2218 2219 2220 2221 2222
}


/* Context: process, rtnl_lock() held. */
static int efx_change_mtu(struct net_device *net_dev, int new_mtu)
{
2223
	struct efx_nic *efx = netdev_priv(net_dev);
2224
	int rc;
2225

2226 2227 2228
	rc = efx_check_disabled(efx);
	if (rc)
		return rc;
2229 2230 2231
	if (new_mtu > EFX_MAX_MTU)
		return -EINVAL;

2232
	netif_dbg(efx, drv, efx->net_dev, "changing MTU to %d\n", new_mtu);
2233

2234 2235 2236
	efx_device_detach_sync(efx);
	efx_stop_all(efx);

B
Ben Hutchings 已提交
2237
	mutex_lock(&efx->mac_lock);
2238
	net_dev->mtu = new_mtu;
2239
	efx_mac_reconfigure(efx);
B
Ben Hutchings 已提交
2240 2241
	mutex_unlock(&efx->mac_lock);

2242
	efx_start_all(efx);
2243
	netif_device_attach(efx->net_dev);
2244
	return 0;
2245 2246 2247 2248
}

static int efx_set_mac_address(struct net_device *net_dev, void *data)
{
2249
	struct efx_nic *efx = netdev_priv(net_dev);
2250
	struct sockaddr *addr = data;
2251
	u8 *new_addr = addr->sa_data;
2252 2253
	u8 old_addr[6];
	int rc;
2254 2255

	if (!is_valid_ether_addr(new_addr)) {
2256 2257 2258
		netif_err(efx, drv, efx->net_dev,
			  "invalid ethernet MAC address requested: %pM\n",
			  new_addr);
2259
		return -EADDRNOTAVAIL;
2260 2261
	}

2262 2263
	/* save old address */
	ether_addr_copy(old_addr, net_dev->dev_addr);
2264
	ether_addr_copy(net_dev->dev_addr, new_addr);
2265 2266
	if (efx->type->set_mac_address) {
		rc = efx->type->set_mac_address(efx);
2267 2268 2269 2270 2271
		if (rc) {
			ether_addr_copy(net_dev->dev_addr, old_addr);
			return rc;
		}
	}
2272 2273

	/* Reconfigure the MAC */
B
Ben Hutchings 已提交
2274
	mutex_lock(&efx->mac_lock);
2275
	efx_mac_reconfigure(efx);
B
Ben Hutchings 已提交
2276
	mutex_unlock(&efx->mac_lock);
2277 2278 2279 2280

	return 0;
}

2281
/* Context: netif_addr_lock held, BHs disabled. */
2282
static void efx_set_rx_mode(struct net_device *net_dev)
2283
{
2284
	struct efx_nic *efx = netdev_priv(net_dev);
2285

2286 2287 2288
	if (efx->port_enabled)
		queue_work(efx->workqueue, &efx->mac_work);
	/* Otherwise efx_start_port() will do this */
2289 2290
}

2291
static int efx_set_features(struct net_device *net_dev, netdev_features_t data)
2292 2293 2294 2295 2296
{
	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)
2297
		return efx->type->filter_clear_rx(efx, EFX_FILTER_PRI_MANUAL);
2298 2299 2300 2301

	return 0;
}

2302
static const struct net_device_ops efx_netdev_ops = {
S
Stephen Hemminger 已提交
2303 2304
	.ndo_open		= efx_net_open,
	.ndo_stop		= efx_net_stop,
2305
	.ndo_get_stats64	= efx_net_stats,
S
Stephen Hemminger 已提交
2306 2307 2308 2309 2310 2311
	.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,
2312
	.ndo_set_rx_mode	= efx_set_rx_mode,
2313
	.ndo_set_features	= efx_set_features,
2314
#ifdef CONFIG_SFC_SRIOV
2315 2316 2317 2318
	.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,
2319
	.ndo_set_vf_link_state  = efx_sriov_set_vf_link_state,
2320
	.ndo_get_phys_port_id   = efx_sriov_get_phys_port_id,
2321
#endif
S
Stephen Hemminger 已提交
2322 2323 2324
#ifdef CONFIG_NET_POLL_CONTROLLER
	.ndo_poll_controller = efx_netpoll,
#endif
2325
	.ndo_setup_tc		= efx_setup_tc,
2326 2327 2328
#ifdef CONFIG_NET_RX_BUSY_POLL
	.ndo_busy_poll		= efx_busy_poll,
#endif
2329 2330 2331
#ifdef CONFIG_RFS_ACCEL
	.ndo_rx_flow_steer	= efx_filter_rfs,
#endif
S
Stephen Hemminger 已提交
2332 2333
};

2334 2335 2336 2337 2338 2339 2340
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);
}

2341 2342 2343
static int efx_netdev_event(struct notifier_block *this,
			    unsigned long event, void *ptr)
{
2344
	struct net_device *net_dev = netdev_notifier_info_to_dev(ptr);
2345

2346
	if ((net_dev->netdev_ops == &efx_netdev_ops) &&
2347 2348
	    event == NETDEV_CHANGENAME)
		efx_update_name(netdev_priv(net_dev));
2349 2350 2351 2352 2353 2354 2355 2356

	return NOTIFY_DONE;
}

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

B
Ben Hutchings 已提交
2357 2358 2359 2360 2361 2362
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);
}
2363
static DEVICE_ATTR(phy_type, 0444, show_phy_type, NULL);
B
Ben Hutchings 已提交
2364

2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386
#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

2387 2388 2389
static int efx_register_netdev(struct efx_nic *efx)
{
	struct net_device *net_dev = efx->net_dev;
2390
	struct efx_channel *channel;
2391 2392 2393 2394
	int rc;

	net_dev->watchdog_timeo = 5 * HZ;
	net_dev->irq = efx->pci_dev->irq;
2395 2396
	net_dev->netdev_ops = &efx_netdev_ops;
	if (efx_nic_rev(efx) >= EFX_REV_HUNT_A0)
2397
		net_dev->priv_flags |= IFF_UNICAST_FLT;
2398
	net_dev->ethtool_ops = &efx_ethtool_ops;
2399
	net_dev->gso_max_segs = EFX_TSO_MAX_SEGS;
2400

2401
	rtnl_lock();
2402

2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415
	/* 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;
	}

2416 2417 2418
	rc = dev_alloc_name(net_dev, net_dev->name);
	if (rc < 0)
		goto fail_locked;
2419
	efx_update_name(efx);
2420

2421 2422 2423
	/* Always start with carrier off; PHY events will detect the link */
	netif_carrier_off(net_dev);

2424 2425 2426 2427
	rc = register_netdevice(net_dev);
	if (rc)
		goto fail_locked;

2428 2429
	efx_for_each_channel(channel, efx) {
		struct efx_tx_queue *tx_queue;
2430 2431
		efx_for_each_channel_tx_queue(tx_queue, channel)
			efx_init_tx_queue_core_txq(tx_queue);
2432 2433
	}

2434 2435
	efx_associate(efx);

2436
	rtnl_unlock();
2437

B
Ben Hutchings 已提交
2438 2439
	rc = device_create_file(&efx->pci_dev->dev, &dev_attr_phy_type);
	if (rc) {
2440 2441
		netif_err(efx, drv, efx->net_dev,
			  "failed to init net dev attributes\n");
B
Ben Hutchings 已提交
2442 2443
		goto fail_registered;
	}
2444 2445 2446 2447 2448 2449 2450 2451
#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
2452

2453
	return 0;
B
Ben Hutchings 已提交
2454

2455 2456 2457 2458
#ifdef CONFIG_SFC_MCDI_LOGGING
fail_attr_mcdi_logging:
	device_remove_file(&efx->pci_dev->dev, &dev_attr_phy_type);
#endif
2459 2460
fail_registered:
	rtnl_lock();
2461
	efx_dissociate(efx);
2462
	unregister_netdevice(net_dev);
2463
fail_locked:
2464
	efx->state = STATE_UNINIT;
2465
	rtnl_unlock();
2466
	netif_err(efx, drv, efx->net_dev, "could not register net dev\n");
2467
	return rc;
2468 2469 2470 2471 2472 2473 2474
}

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

2475
	BUG_ON(netdev_priv(efx->net_dev) != efx);
2476

2477 2478 2479 2480 2481 2482 2483 2484
	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);
	}
2485 2486 2487 2488 2489 2490 2491 2492
}

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

B
Ben Hutchings 已提交
2493 2494
/* Tears down the entire software state and most of the hardware state
 * before reset.  */
B
Ben Hutchings 已提交
2495
void efx_reset_down(struct efx_nic *efx, enum reset_type method)
2496 2497 2498
{
	EFX_ASSERT_RESET_SERIALISED(efx);

2499 2500 2501
	if (method == RESET_TYPE_MCDI_TIMEOUT)
		efx->type->prepare_flr(efx);

B
Ben Hutchings 已提交
2502
	efx_stop_all(efx);
B
Ben Hutchings 已提交
2503
	efx_disable_interrupts(efx);
2504 2505

	mutex_lock(&efx->mac_lock);
2506 2507
	if (efx->port_initialized && method != RESET_TYPE_INVISIBLE &&
	    method != RESET_TYPE_DATAPATH)
2508
		efx->phy_op->fini(efx);
2509
	efx->type->fini(efx);
2510 2511
}

B
Ben Hutchings 已提交
2512 2513 2514 2515 2516
/* 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
2517
int efx_reset_up(struct efx_nic *efx, enum reset_type method, bool ok)
2518 2519 2520
{
	int rc;

B
Ben Hutchings 已提交
2521
	EFX_ASSERT_RESET_SERIALISED(efx);
2522

2523 2524 2525 2526
	if (method == RESET_TYPE_MCDI_TIMEOUT)
		efx->type->finish_flr(efx);

	/* Ensure that SRAM is initialised even if we're disabling the device */
2527
	rc = efx->type->init(efx);
2528
	if (rc) {
2529
		netif_err(efx, drv, efx->net_dev, "failed to initialise NIC\n");
2530
		goto fail;
2531 2532
	}

2533 2534 2535
	if (!ok)
		goto fail;

2536 2537
	if (efx->port_initialized && method != RESET_TYPE_INVISIBLE &&
	    method != RESET_TYPE_DATAPATH) {
2538 2539 2540
		rc = efx->phy_op->init(efx);
		if (rc)
			goto fail;
2541 2542
		rc = efx->phy_op->reconfigure(efx);
		if (rc && rc != -EPERM)
2543 2544
			netif_err(efx, drv, efx->net_dev,
				  "could not restore PHY settings\n");
2545 2546
	}

2547 2548 2549
	rc = efx_enable_interrupts(efx);
	if (rc)
		goto fail;
2550 2551 2552 2553 2554 2555 2556 2557 2558

#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

2559
	down_read(&efx->filter_sem);
B
Ben Hutchings 已提交
2560
	efx_restore_filters(efx);
2561
	up_read(&efx->filter_sem);
2562 2563
	if (efx->type->sriov_reset)
		efx->type->sriov_reset(efx);
2564 2565 2566 2567 2568 2569 2570 2571 2572

	mutex_unlock(&efx->mac_lock);

	efx_start_all(efx);

	return 0;

fail:
	efx->port_initialized = false;
B
Ben Hutchings 已提交
2573 2574 2575

	mutex_unlock(&efx->mac_lock);

2576 2577 2578
	return rc;
}

2579 2580
/* 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.
2581
 *
2582
 * Caller must hold the rtnl_lock.
2583
 */
2584
int efx_reset(struct efx_nic *efx, enum reset_type method)
2585
{
2586 2587
	int rc, rc2;
	bool disabled;
2588

2589 2590
	netif_info(efx, drv, efx->net_dev, "resetting (%s)\n",
		   RESET_TYPE(method));
2591

2592
	efx_device_detach_sync(efx);
B
Ben Hutchings 已提交
2593
	efx_reset_down(efx, method);
2594

2595
	rc = efx->type->reset(efx, method);
2596
	if (rc) {
2597
		netif_err(efx, drv, efx->net_dev, "failed to reset hardware\n");
2598
		goto out;
2599 2600
	}

2601 2602 2603
	/* Clear flags for the scopes we covered.  We assume the NIC and
	 * driver are now quiescent so that there is no race here.
	 */
2604 2605 2606 2607
	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);
2608 2609 2610 2611 2612 2613 2614

	/* 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);

2615
out:
2616
	/* Leave device stopped if necessary */
2617 2618 2619
	disabled = rc ||
		method == RESET_TYPE_DISABLE ||
		method == RESET_TYPE_RECOVER_OR_DISABLE;
2620 2621 2622 2623 2624
	rc2 = efx_reset_up(efx, method, !disabled);
	if (rc2) {
		disabled = true;
		if (!rc)
			rc = rc2;
2625 2626
	}

2627
	if (disabled) {
2628
		dev_close(efx->net_dev);
2629
		netif_err(efx, drv, efx->net_dev, "has been disabled\n");
2630 2631
		efx->state = STATE_DISABLED;
	} else {
2632
		netif_dbg(efx, drv, efx->net_dev, "reset complete\n");
2633
		netif_device_attach(efx->net_dev);
2634
	}
2635 2636 2637
	return rc;
}

2638 2639 2640 2641 2642
/* Try recovery mechanisms.
 * For now only EEH is supported.
 * Returns 0 if the recovery mechanisms are unsuccessful.
 * Returns a non-zero value otherwise.
 */
2643
int efx_try_recovery(struct efx_nic *efx)
2644 2645 2646 2647 2648 2649 2650
{
#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.
	 */
2651
	struct eeh_dev *eehdev = pci_dev_to_eeh_dev(efx->pci_dev);
2652 2653 2654 2655 2656 2657 2658 2659 2660 2661
	if (eeh_dev_check_failure(eehdev)) {
		/* The EEH mechanisms will handle the error and reset the
		 * device if necessary.
		 */
		return 1;
	}
#endif
	return 0;
}

2662 2663 2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 2674 2675 2676 2677 2678 2679
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;
}

2680 2681 2682 2683 2684
/* 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)
{
2685
	struct efx_nic *efx = container_of(data, struct efx_nic, reset_work);
2686 2687 2688 2689 2690 2691
	unsigned long pending;
	enum reset_type method;

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

2692 2693 2694
	if (method == RESET_TYPE_MC_BIST)
		efx_wait_for_bist_end(efx);

2695 2696 2697 2698
	if ((method == RESET_TYPE_RECOVER_OR_DISABLE ||
	     method == RESET_TYPE_RECOVER_OR_ALL) &&
	    efx_try_recovery(efx))
		return;
2699

2700
	if (!pending)
2701 2702
		return;

2703
	rtnl_lock();
2704 2705 2706 2707 2708 2709

	/* 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)
2710
		(void)efx_reset(efx, method);
2711

2712
	rtnl_unlock();
2713 2714 2715 2716 2717 2718
}

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

2719 2720 2721 2722 2723 2724 2725
	if (efx->state == STATE_RECOVERY) {
		netif_dbg(efx, drv, efx->net_dev,
			  "recovering: skip scheduling %s reset\n",
			  RESET_TYPE(type));
		return;
	}

2726 2727 2728
	switch (type) {
	case RESET_TYPE_INVISIBLE:
	case RESET_TYPE_ALL:
2729
	case RESET_TYPE_RECOVER_OR_ALL:
2730 2731
	case RESET_TYPE_WORLD:
	case RESET_TYPE_DISABLE:
2732
	case RESET_TYPE_RECOVER_OR_DISABLE:
2733
	case RESET_TYPE_DATAPATH:
2734
	case RESET_TYPE_MC_BIST:
2735
	case RESET_TYPE_MCDI_TIMEOUT:
2736
		method = type;
2737 2738
		netif_dbg(efx, drv, efx->net_dev, "scheduling %s reset\n",
			  RESET_TYPE(method));
2739 2740
		break;
	default:
2741
		method = efx->type->map_reset_reason(type);
2742 2743 2744
		netif_dbg(efx, drv, efx->net_dev,
			  "scheduling %s reset for %s\n",
			  RESET_TYPE(method), RESET_TYPE(type));
2745 2746
		break;
	}
2747

2748
	set_bit(method, &efx->reset_pending);
2749 2750 2751 2752 2753 2754 2755
	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;
2756

2757 2758 2759 2760
	/* 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);

2761
	queue_work(reset_workqueue, &efx->reset_work);
2762 2763 2764 2765 2766 2767 2768 2769 2770
}

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

/* PCI device ID table */
2771
static const struct pci_device_id efx_pci_table[] = {
2772 2773
	{PCI_DEVICE(PCI_VENDOR_ID_SOLARFLARE,
		    PCI_DEVICE_ID_SOLARFLARE_SFC4000A_0),
2774
	 .driver_data = (unsigned long) &falcon_a1_nic_type},
2775 2776
	{PCI_DEVICE(PCI_VENDOR_ID_SOLARFLARE,
		    PCI_DEVICE_ID_SOLARFLARE_SFC4000B),
2777
	 .driver_data = (unsigned long) &falcon_b0_nic_type},
2778
	{PCI_DEVICE(PCI_VENDOR_ID_SOLARFLARE, 0x0803),	/* SFC9020 */
2779
	 .driver_data = (unsigned long) &siena_a0_nic_type},
2780
	{PCI_DEVICE(PCI_VENDOR_ID_SOLARFLARE, 0x0813),	/* SFL9021 */
2781
	 .driver_data = (unsigned long) &siena_a0_nic_type},
2782 2783
	{PCI_DEVICE(PCI_VENDOR_ID_SOLARFLARE, 0x0903),  /* SFC9120 PF */
	 .driver_data = (unsigned long) &efx_hunt_a0_nic_type},
2784 2785
	{PCI_DEVICE(PCI_VENDOR_ID_SOLARFLARE, 0x1903),  /* SFC9120 VF */
	 .driver_data = (unsigned long) &efx_hunt_a0_vf_nic_type},
2786 2787
	{PCI_DEVICE(PCI_VENDOR_ID_SOLARFLARE, 0x0923),  /* SFC9140 PF */
	 .driver_data = (unsigned long) &efx_hunt_a0_nic_type},
2788 2789 2790 2791 2792
	{0}			/* end of list */
};

/**************************************************************************
 *
2793
 * Dummy PHY/MAC operations
2794
 *
2795
 * Can be used for some unimplemented operations
2796 2797 2798 2799 2800 2801 2802 2803 2804
 * 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
2805 2806

static bool efx_port_dummy_op_poll(struct efx_nic *efx)
S
Steve Hodgson 已提交
2807 2808 2809
{
	return false;
}
2810

2811
static const struct efx_phy_operations efx_dummy_phy_operations = {
2812
	.init		 = efx_port_dummy_op_int,
B
Ben Hutchings 已提交
2813
	.reconfigure	 = efx_port_dummy_op_int,
S
Steve Hodgson 已提交
2814
	.poll		 = efx_port_dummy_op_poll,
2815 2816 2817 2818 2819 2820 2821 2822 2823 2824 2825 2826
	.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).
 */
2827
static int efx_init_struct(struct efx_nic *efx,
2828 2829
			   struct pci_dev *pci_dev, struct net_device *net_dev)
{
2830
	int i;
2831 2832

	/* Initialise common structures */
2833 2834
	INIT_LIST_HEAD(&efx->node);
	INIT_LIST_HEAD(&efx->secondary_list);
2835
	spin_lock_init(&efx->biu_lock);
2836 2837 2838
#ifdef CONFIG_SFC_MTD
	INIT_LIST_HEAD(&efx->mtd_list);
#endif
2839 2840
	INIT_WORK(&efx->reset_work, efx_reset_work);
	INIT_DELAYED_WORK(&efx->monitor_work, efx_monitor);
2841
	INIT_DELAYED_WORK(&efx->selftest_work, efx_selftest_async_work);
2842
	efx->pci_dev = pci_dev;
2843
	efx->msg_enable = debug;
2844
	efx->state = STATE_UNINIT;
2845 2846 2847
	strlcpy(efx->name, pci_name(pci_dev), sizeof(efx->name));

	efx->net_dev = net_dev;
2848
	efx->rx_prefix_size = efx->type->rx_prefix_size;
2849 2850
	efx->rx_ip_align =
		NET_IP_ALIGN ? (efx->rx_prefix_size + NET_IP_ALIGN) % 4 : 0;
2851 2852
	efx->rx_packet_hash_offset =
		efx->type->rx_hash_offset - efx->type->rx_prefix_size;
2853 2854
	efx->rx_packet_ts_offset =
		efx->type->rx_ts_offset - efx->type->rx_prefix_size;
2855 2856 2857
	spin_lock_init(&efx->stats_lock);
	mutex_init(&efx->mac_lock);
	efx->phy_op = &efx_dummy_phy_operations;
2858
	efx->mdio.dev = net_dev;
2859
	INIT_WORK(&efx->mac_work, efx_mac_work);
2860
	init_waitqueue_head(&efx->flush_wq);
2861 2862

	for (i = 0; i < EFX_MAX_CHANNELS; i++) {
2863 2864 2865
		efx->channel[i] = efx_alloc_channel(efx, i, NULL);
		if (!efx->channel[i])
			goto fail;
B
Ben Hutchings 已提交
2866 2867
		efx->msi_context[i].efx = efx;
		efx->msi_context[i].index = i;
2868 2869 2870 2871 2872 2873
	}

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

2874 2875 2876 2877
	/* 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);
2878
	if (!efx->workqueue)
2879
		goto fail;
2880

2881
	return 0;
2882 2883 2884 2885

fail:
	efx_fini_struct(efx);
	return -ENOMEM;
2886 2887 2888 2889
}

static void efx_fini_struct(struct efx_nic *efx)
{
2890 2891 2892 2893 2894
	int i;

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

2895 2896
	kfree(efx->vpd_sn);

2897 2898 2899 2900 2901 2902
	if (efx->workqueue) {
		destroy_workqueue(efx->workqueue);
		efx->workqueue = NULL;
	}
}

2903 2904 2905 2906 2907 2908 2909 2910 2911 2912 2913
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);
}

2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924
/**************************************************************************
 *
 * 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)
{
2925 2926 2927 2928 2929 2930
	/* 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
2931
	efx_disable_interrupts(efx);
2932
	efx_nic_fini_interrupt(efx);
2933
	efx_fini_port(efx);
2934
	efx->type->fini(efx);
2935 2936 2937 2938 2939
	efx_fini_napi(efx);
	efx_remove_all(efx);
}

/* Final NIC shutdown
2940 2941
 * This is called only at module unload (or hotplug removal).  A PF can call
 * this on its VFs to ensure they are unbound first.
2942 2943 2944 2945 2946 2947 2948 2949 2950 2951 2952
 */
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();
2953
	efx_dissociate(efx);
2954
	dev_close(efx->net_dev);
B
Ben Hutchings 已提交
2955
	efx_disable_interrupts(efx);
2956
	efx->state = STATE_UNINIT;
2957 2958
	rtnl_unlock();

2959 2960 2961
	if (efx->type->sriov_fini)
		efx->type->sriov_fini(efx);

2962 2963
	efx_unregister_netdev(efx);

2964 2965
	efx_mtd_remove(efx);

2966 2967 2968
	efx_pci_remove_main(efx);

	efx_fini_io(efx);
2969
	netif_dbg(efx, drv, efx->net_dev, "shutdown successful\n");
2970 2971 2972

	efx_fini_struct(efx);
	free_netdev(efx->net_dev);
2973 2974

	pci_disable_pcie_error_reporting(pci_dev);
2975 2976
};

2977 2978 2979 2980 2981 2982
/* 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
2983
static void efx_probe_vpd_strings(struct efx_nic *efx)
2984 2985 2986 2987
{
	struct pci_dev *dev = efx->pci_dev;
	char vpd_data[SFC_VPD_LEN];
	ssize_t vpd_size;
2988
	int ro_start, ro_size, i, j;
2989 2990 2991 2992 2993 2994 2995 2996 2997

	/* 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 */
2998 2999
	ro_start = pci_vpd_find_tag(vpd_data, 0, vpd_size, PCI_VPD_LRDT_RO_DATA);
	if (ro_start < 0) {
3000 3001 3002 3003
		netif_err(efx, drv, efx->net_dev, "VPD Read-only not found\n");
		return;
	}

3004 3005 3006
	ro_size = pci_vpd_lrdt_size(&vpd_data[ro_start]);
	j = ro_size;
	i = ro_start + PCI_VPD_LRDT_TAG_SIZE;
3007 3008 3009 3010 3011 3012 3013 3014 3015 3016 3017 3018 3019 3020 3021 3022 3023 3024 3025
	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]);
3026 3027 3028 3029 3030 3031 3032 3033 3034 3035 3036 3037 3038 3039 3040 3041 3042 3043 3044 3045 3046

	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]);
3047 3048 3049
}


3050 3051 3052 3053 3054 3055 3056 3057 3058 3059 3060 3061
/* 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;

3062
	efx_init_napi(efx);
3063

3064
	rc = efx->type->init(efx);
3065
	if (rc) {
3066 3067
		netif_err(efx, probe, efx->net_dev,
			  "failed to initialise NIC\n");
3068
		goto fail3;
3069 3070 3071 3072
	}

	rc = efx_init_port(efx);
	if (rc) {
3073 3074
		netif_err(efx, probe, efx->net_dev,
			  "failed to initialise port\n");
3075
		goto fail4;
3076 3077
	}

3078
	rc = efx_nic_init_interrupt(efx);
3079
	if (rc)
3080
		goto fail5;
3081 3082 3083
	rc = efx_enable_interrupts(efx);
	if (rc)
		goto fail6;
3084 3085 3086

	return 0;

3087 3088
 fail6:
	efx_nic_fini_interrupt(efx);
3089
 fail5:
3090 3091
	efx_fini_port(efx);
 fail4:
3092
	efx->type->fini(efx);
3093 3094 3095 3096 3097 3098 3099 3100 3101 3102
 fail3:
	efx_fini_napi(efx);
	efx_remove_all(efx);
 fail1:
	return rc;
}

/* NIC initialisation
 *
 * This is called at module load (or hotplug insertion,
3103
 * theoretically).  It sets up PCI mappings, resets the NIC,
3104 3105 3106 3107 3108
 * 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
3109
static int efx_pci_probe(struct pci_dev *pci_dev,
3110
			 const struct pci_device_id *entry)
3111 3112 3113
{
	struct net_device *net_dev;
	struct efx_nic *efx;
3114
	int rc;
3115 3116

	/* Allocate and initialise a struct net_device and struct efx_nic */
3117 3118
	net_dev = alloc_etherdev_mqs(sizeof(*efx), EFX_MAX_CORE_TX_QUEUES,
				     EFX_MAX_RX_QUEUES);
3119 3120
	if (!net_dev)
		return -ENOMEM;
3121 3122 3123
	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
3124
			      NETIF_F_HIGHDMA | NETIF_F_TSO |
3125
			      NETIF_F_RXCSUM);
3126
	if (efx->type->offload_features & NETIF_F_V6_CSUM)
B
Ben Hutchings 已提交
3127
		net_dev->features |= NETIF_F_TSO6;
3128 3129
	/* Mask for features that also apply to VLAN devices */
	net_dev->vlan_features |= (NETIF_F_ALL_CSUM | NETIF_F_SG |
3130 3131 3132 3133
				   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;
3134
	pci_set_drvdata(pci_dev, efx);
3135
	SET_NETDEV_DEV(net_dev, &pci_dev->dev);
3136
	rc = efx_init_struct(efx, pci_dev, net_dev);
3137 3138 3139
	if (rc)
		goto fail1;

3140
	netif_info(efx, probe, efx->net_dev,
3141
		   "Solarflare NIC detected\n");
3142

3143 3144
	if (!efx->type->is_vf)
		efx_probe_vpd_strings(efx);
3145

3146 3147 3148 3149 3150
	/* Set up basic I/O (BAR mappings etc) */
	rc = efx_init_io(efx);
	if (rc)
		goto fail2;

3151 3152 3153
	rc = efx_pci_probe_main(efx);
	if (rc)
		goto fail3;
3154 3155 3156

	rc = efx_register_netdev(efx);
	if (rc)
3157
		goto fail4;
3158

3159 3160 3161 3162 3163 3164
	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);
	}
3165

3166
	netif_dbg(efx, probe, efx->net_dev, "initialisation successful\n");
3167

3168
	/* Try to create MTDs, but allow this to fail */
3169
	rtnl_lock();
3170
	rc = efx_mtd_probe(efx);
3171
	rtnl_unlock();
3172 3173 3174 3175
	if (rc)
		netif_warn(efx, probe, efx->net_dev,
			   "failed to create MTDs (%d)\n", rc);

3176 3177 3178 3179 3180
	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);

3181 3182 3183
	return 0;

 fail4:
3184
	efx_pci_remove_main(efx);
3185 3186 3187 3188 3189
 fail3:
	efx_fini_io(efx);
 fail2:
	efx_fini_struct(efx);
 fail1:
S
Steve Hodgson 已提交
3190
	WARN_ON(rc > 0);
3191
	netif_dbg(efx, drv, efx->net_dev, "initialisation failed. rc=%d\n", rc);
3192 3193 3194 3195
	free_netdev(net_dev);
	return rc;
}

3196 3197 3198 3199 3200 3201 3202 3203 3204 3205 3206 3207 3208 3209 3210 3211 3212 3213 3214 3215
/* 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

3216 3217 3218 3219
static int efx_pm_freeze(struct device *dev)
{
	struct efx_nic *efx = pci_get_drvdata(to_pci_dev(dev));

3220 3221
	rtnl_lock();

3222 3223
	if (efx->state != STATE_DISABLED) {
		efx->state = STATE_UNINIT;
3224

3225
		efx_device_detach_sync(efx);
3226

3227
		efx_stop_all(efx);
B
Ben Hutchings 已提交
3228
		efx_disable_interrupts(efx);
3229
	}
3230

3231 3232
	rtnl_unlock();

3233 3234 3235 3236 3237
	return 0;
}

static int efx_pm_thaw(struct device *dev)
{
3238
	int rc;
3239 3240
	struct efx_nic *efx = pci_get_drvdata(to_pci_dev(dev));

3241 3242
	rtnl_lock();

3243
	if (efx->state != STATE_DISABLED) {
3244 3245 3246
		rc = efx_enable_interrupts(efx);
		if (rc)
			goto fail;
3247

3248 3249 3250
		mutex_lock(&efx->mac_lock);
		efx->phy_op->reconfigure(efx);
		mutex_unlock(&efx->mac_lock);
3251

3252
		efx_start_all(efx);
3253

3254
		netif_device_attach(efx->net_dev);
3255

3256
		efx->state = STATE_READY;
3257

3258 3259
		efx->type->resume_wol(efx);
	}
3260

3261 3262
	rtnl_unlock();

3263 3264 3265
	/* Reschedule any quenched resets scheduled during efx_pm_freeze() */
	queue_work(reset_workqueue, &efx->reset_work);

3266
	return 0;
3267 3268 3269 3270 3271

fail:
	rtnl_unlock();

	return rc;
3272 3273 3274 3275 3276 3277 3278 3279 3280
}

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);

3281
	efx->reset_pending = 0;
3282 3283 3284 3285 3286 3287 3288 3289 3290 3291 3292 3293 3294 3295 3296 3297 3298 3299 3300 3301 3302 3303 3304 3305 3306 3307

	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;
3308 3309
	rc = efx_pm_thaw(dev);
	return rc;
3310 3311 3312 3313 3314 3315 3316 3317 3318 3319 3320 3321 3322
}

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;
}

3323
static const struct dev_pm_ops efx_pm_ops = {
3324 3325 3326 3327 3328 3329 3330 3331
	.suspend	= efx_pm_suspend,
	.resume		= efx_pm_resume,
	.freeze		= efx_pm_freeze,
	.thaw		= efx_pm_thaw,
	.poweroff	= efx_pm_poweroff,
	.restore	= efx_pm_resume,
};

3332 3333 3334 3335
/* 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.
 */
3336 3337
static pci_ers_result_t efx_io_error_detected(struct pci_dev *pdev,
					      enum pci_channel_state state)
3338 3339 3340 3341 3342 3343 3344 3345 3346 3347 3348 3349 3350 3351 3352 3353
{
	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
3354
		efx_disable_interrupts(efx);
3355 3356 3357 3358 3359 3360 3361 3362 3363 3364 3365 3366 3367 3368 3369 3370

		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;
}

3371
/* Fake a successful reset, which will be performed later in efx_io_resume. */
3372
static pci_ers_result_t efx_io_slot_reset(struct pci_dev *pdev)
3373 3374 3375 3376 3377 3378 3379 3380 3381 3382 3383 3384 3385 3386 3387 3388 3389 3390 3391 3392 3393 3394 3395 3396 3397 3398 3399 3400 3401 3402 3403 3404 3405 3406 3407 3408 3409 3410 3411 3412 3413 3414 3415 3416 3417 3418 3419 3420 3421 3422 3423 3424 3425 3426 3427 3428 3429 3430
{
	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,
};

3431
static struct pci_driver efx_pci_driver = {
3432
	.name		= KBUILD_MODNAME,
3433 3434 3435
	.id_table	= efx_pci_table,
	.probe		= efx_pci_probe,
	.remove		= efx_pci_remove,
3436
	.driver.pm	= &efx_pm_ops,
3437
	.err_handler	= &efx_err_handlers,
3438 3439 3440
#ifdef CONFIG_SFC_SRIOV
	.sriov_configure = efx_pci_sriov_configure,
#endif
3441 3442 3443 3444 3445 3446 3447 3448 3449 3450 3451 3452 3453 3454 3455 3456 3457 3458 3459 3460 3461 3462
};

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

3463
#ifdef CONFIG_SFC_SRIOV
3464 3465 3466
	rc = efx_init_sriov();
	if (rc)
		goto err_sriov;
3467
#endif
3468

3469 3470 3471 3472 3473
	reset_workqueue = create_singlethread_workqueue("sfc_reset");
	if (!reset_workqueue) {
		rc = -ENOMEM;
		goto err_reset;
	}
3474 3475 3476 3477 3478 3479 3480 3481

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

	return 0;

 err_pci:
3482 3483
	destroy_workqueue(reset_workqueue);
 err_reset:
3484
#ifdef CONFIG_SFC_SRIOV
3485 3486
	efx_fini_sriov();
 err_sriov:
3487
#endif
3488 3489 3490 3491 3492 3493 3494 3495 3496 3497
	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);
3498
	destroy_workqueue(reset_workqueue);
3499
#ifdef CONFIG_SFC_SRIOV
3500
	efx_fini_sriov();
3501
#endif
3502 3503 3504 3505 3506 3507 3508
	unregister_netdevice_notifier(&efx_netdev_notifier);

}

module_init(efx_init_module);
module_exit(efx_exit_module);

3509 3510
MODULE_AUTHOR("Solarflare Communications and "
	      "Michael Brown <mbrown@fensystems.co.uk>");
B
Ben Hutchings 已提交
3511
MODULE_DESCRIPTION("Solarflare network driver");
3512 3513
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, efx_pci_table);