// SPDX-License-Identifier: GPL-2.0-only
/****************************************************************************
 * Driver for Solarflare network controllers and boards
 * Copyright 2005-2006 Fen Systems Ltd.
 * Copyright 2005-2013 Solarflare Communications Inc.
 */

#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>
#include <linux/topology.h>
#include <linux/gfp.h>
#include <linux/aer.h>
#include <linux/interrupt.h>
#include "net_driver.h"
#include <net/gre.h>
#include <net/udp_tunnel.h>
#include "efx.h"
#include "efx_common.h"
#include "efx_channels.h"
#include "rx_common.h"
#include "tx_common.h"
#include "nic.h"
#include "io.h"
#include "selftest.h"
#include "sriov.h"

#include "mcdi.h"
#include "mcdi_pcol.h"
#include "workarounds.h"

/**************************************************************************
 *
 * Type name strings
 *
 **************************************************************************
 */

/* UDP tunnel type names */
static const char *const efx_udp_tunnel_type_names[] = {
        [TUNNEL_ENCAP_UDP_PORT_ENTRY_VXLAN] = "vxlan",
        [TUNNEL_ENCAP_UDP_PORT_ENTRY_GENEVE] = "geneve",
};

void efx_get_udp_tunnel_type_name(u16 type, char *buf, size_t buflen)
{
        if (type < ARRAY_SIZE(efx_udp_tunnel_type_names) &&
            efx_udp_tunnel_type_names[type] != NULL)
                snprintf(buf, buflen, "%s", efx_udp_tunnel_type_names[type]);
        else
                snprintf(buf, buflen, "type %d", type);
}

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

/*
 * Use separate channels for TX and RX events
 *
 * Set this to 1 to use separate channels for TX and RX. It allows us
 * to control interrupt affinity separately for TX and RX.
 *
 * This is only used in MSI-X interrupt mode
 */
bool efx_separate_tx_channels;
module_param(efx_separate_tx_channels, bool, 0444);
MODULE_PARM_DESC(efx_separate_tx_channels,
                 "Use separate channels for TX and RX");

/* 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;

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

static unsigned debug = (NETIF_MSG_DRV | NETIF_MSG_PROBE |
                         NETIF_MSG_LINK | NETIF_MSG_IFDOWN |
                         NETIF_MSG_IFUP | NETIF_MSG_RX_ERR |
                         NETIF_MSG_TX_ERR | NETIF_MSG_HW);
module_param(debug, uint, 0);
MODULE_PARM_DESC(debug, "Bitmapped debugging message enable value");

/**************************************************************************
 *
 * Utility functions and prototypes
 *
 *************************************************************************/

static const struct efx_channel_type efx_default_channel_type;
static void efx_remove_port(struct efx_nic *efx);
static int efx_xdp_setup_prog(struct efx_nic *efx, struct bpf_prog *prog);
static int efx_xdp(struct net_device *dev, struct netdev_bpf *xdp);
static int efx_xdp_xmit(struct net_device *dev, int n, struct xdp_frame **xdpfs,
                        u32 flags);

#define EFX_ASSERT_RESET_SERIALISED(efx)                \
        do {                                            \
                if ((efx->state == STATE_READY) ||      \
                    (efx->state == STATE_RECOVERY) ||   \
                    (efx->state == STATE_DISABLED))     \
                        ASSERT_RTNL();                  \
        } while (0)

/**************************************************************************
 *
 * Port handling
 *
 **************************************************************************/

/* Equivalent to efx_link_set_advertising with all-zeroes, except does not
 * force the Autoneg bit on.
 */
void efx_link_clear_advertising(struct efx_nic *efx)
{
        bitmap_zero(efx->link_advertising, __ETHTOOL_LINK_MODE_MASK_NBITS);
        efx->wanted_fc &= ~(EFX_FC_TX | EFX_FC_RX);
}

void efx_link_set_wanted_fc(struct efx_nic *efx, u8 wanted_fc)
{
        efx->wanted_fc = wanted_fc;
        if (efx->link_advertising[0]) {
                if (wanted_fc & EFX_FC_RX)
                        efx->link_advertising[0] |= (ADVERTISED_Pause |
                                                     ADVERTISED_Asym_Pause);
                else
                        efx->link_advertising[0] &= ~(ADVERTISED_Pause |
                                                      ADVERTISED_Asym_Pause);
                if (wanted_fc & EFX_FC_TX)
                        efx->link_advertising[0] ^= ADVERTISED_Asym_Pause;
        }
}

static void efx_fini_port(struct efx_nic *efx);

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

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

        if (phy_flash_cfg)
                efx->phy_mode = PHY_MODE_SPECIAL;

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

        /* Initialise MAC address to permanent address */
        ether_addr_copy(efx->net_dev->dev_addr, efx->net_dev->perm_addr);

        return 0;
}

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

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

        mutex_lock(&efx->mac_lock);

        rc = efx->phy_op->init(efx);
        if (rc)
                goto fail1;

        efx->port_initialized = true;

        /* Reconfigure the MAC before creating dma queues (required for
         * Falcon/A1 where RX_INGR_EN/TX_DRAIN_EN isn't supported) */
        efx_mac_reconfigure(efx);

        /* Ensure the PHY advertises the correct flow control settings */
        rc = efx->phy_op->reconfigure(efx);
        if (rc && rc != -EPERM)
                goto fail2;

        mutex_unlock(&efx->mac_lock);
        return 0;

fail2:
        efx->phy_op->fini(efx);
fail1:
        mutex_unlock(&efx->mac_lock);
        return rc;
}

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

        if (!efx->port_initialized)
                return;

        efx->phy_op->fini(efx);
        efx->port_initialized = false;

        efx->link_state.up = false;
        efx_link_status_changed(efx);
}

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

        efx->type->remove_port(efx);
}

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

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;
        }
}

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

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

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

        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;
                }

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

                rc = efx_set_channels(efx);
                if (rc)
                        goto fail1;

                /* 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);

        if (efx->n_channels > 1)
                netdev_rss_key_fill(efx->rss_context.rx_hash_key,
                                    sizeof(efx->rss_context.rx_hash_key));
        efx_set_default_rx_indir_table(efx, &efx->rss_context);

        netif_set_real_num_tx_queues(efx->net_dev, efx->n_tx_channels);
        netif_set_real_num_rx_queues(efx->net_dev, efx->n_rx_channels);

        /* Initialise the interrupt moderation settings */
        efx->irq_mod_step_us = DIV_ROUND_UP(efx->timer_quantum_ns, 1000);
        efx_init_irq_moderation(efx, tx_irq_mod_usec, rx_irq_mod_usec, true,
                                true);

        return 0;

fail2:
        efx_remove_interrupts(efx);
fail1:
        efx->type->remove(efx);
        return rc;
}

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

        efx_remove_interrupts(efx);
        efx->type->remove(efx);
}

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

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

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

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

        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;
        }
        efx->rxq_entries = efx->txq_entries = EFX_DEFAULT_DMAQ_SIZE;

#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

        rc = efx_probe_filters(efx);
        if (rc) {
                netif_err(efx, probe, efx->net_dev,
                          "failed to create filter tables\n");
                goto fail4;
        }

        rc = efx_probe_channels(efx);
        if (rc)
                goto fail5;

        return 0;

 fail5:
        efx_remove_filters(efx);
 fail4:
#ifdef CONFIG_SFC_SRIOV
        efx->type->vswitching_remove(efx);
#endif
 fail3:
        efx_remove_port(efx);
 fail2:
        efx_remove_nic(efx);
 fail1:
        return rc;
}

static void efx_remove_all(struct efx_nic *efx)
{
        rtnl_lock();
        efx_xdp_setup_prog(efx, NULL);
        rtnl_unlock();

        efx_remove_channels(efx);
        efx_remove_filters(efx);
#ifdef CONFIG_SFC_SRIOV
        efx->type->vswitching_remove(efx);
#endif
        efx_remove_port(efx);
        efx_remove_nic(efx);
}

/**************************************************************************
 *
 * Interrupt moderation
 *
 **************************************************************************/
unsigned int efx_usecs_to_ticks(struct efx_nic *efx, unsigned int usecs)
{
        if (usecs == 0)
                return 0;
        if (usecs * 1000 < efx->timer_quantum_ns)
                return 1; /* never round down to 0 */
        return usecs * 1000 / efx->timer_quantum_ns;
}

unsigned int efx_ticks_to_usecs(struct efx_nic *efx, unsigned int ticks)
{
        /* We must round up when converting ticks to microseconds
         * because we round down when converting the other way.
         */
        return DIV_ROUND_UP(ticks * efx->timer_quantum_ns, 1000);
}

/* Set interrupt moderation parameters */
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)
{
        struct efx_channel *channel;
        unsigned int timer_max_us;

        EFX_ASSERT_RESET_SERIALISED(efx);

        timer_max_us = efx->timer_max_ns / 1000;

        if (tx_usecs > timer_max_us || rx_usecs > timer_max_us)
                return -EINVAL;

        if (tx_usecs != rx_usecs && 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;
        }

        efx->irq_rx_adaptive = rx_adaptive;
        efx->irq_rx_moderation_us = rx_usecs;
        efx_for_each_channel(channel, efx) {
                if (efx_channel_has_rx_queue(channel))
                        channel->irq_moderation_us = rx_usecs;
                else if (efx_channel_has_tx_queues(channel))
                        channel->irq_moderation_us = tx_usecs;
                else if (efx_channel_is_xdp_tx(channel))
                        channel->irq_moderation_us = tx_usecs;
        }

        return 0;
}

void efx_get_irq_moderation(struct efx_nic *efx, unsigned int *tx_usecs,
                            unsigned int *rx_usecs, bool *rx_adaptive)
{
        *rx_adaptive = efx->irq_rx_adaptive;
        *rx_usecs = efx->irq_rx_moderation_us;

        /* 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 {
                struct efx_channel *tx_channel;

                tx_channel = efx->channel[efx->tx_channel_offset];
                *tx_usecs = tx_channel->irq_moderation_us;
        }
}

/**************************************************************************
 *
 * ioctls
 *
 *************************************************************************/

/* Net device ioctl
 * Context: process, rtnl_lock() held.
 */
static int efx_ioctl(struct net_device *net_dev, struct ifreq *ifr, int cmd)
{
        struct efx_nic *efx = netdev_priv(net_dev);
        struct mii_ioctl_data *data = if_mii(ifr);

        if (cmd == SIOCSHWTSTAMP)
                return efx_ptp_set_ts_config(efx, ifr);
        if (cmd == SIOCGHWTSTAMP)
                return efx_ptp_get_ts_config(efx, ifr);

        /* 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);
}

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

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

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

        rc = efx_check_disabled(efx);
        if (rc)
                return rc;
        if (efx->phy_mode & PHY_MODE_SPECIAL)
                return -EBUSY;
        if (efx_mcdi_poll_reboot(efx) && efx_reset(efx, RESET_TYPE_ALL))
                return -EIO;

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

        efx_start_all(efx);
        if (efx->state == STATE_DISABLED || efx->reset_pending)
                netif_device_detach(efx->net_dev);
        efx_selftest_async_start(efx);
        return 0;
}

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

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

        /* Stop the device and flush all the channels */
        efx_stop_all(efx);

        return 0;
}

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

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

        efx_schedule_reset(efx, RESET_TYPE_TX_WATCHDOG);
}

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

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

        /* save old address */
        ether_addr_copy(old_addr, net_dev->dev_addr);
        ether_addr_copy(net_dev->dev_addr, new_addr);
        if (efx->type->set_mac_address) {
                rc = efx->type->set_mac_address(efx);
                if (rc) {
                        ether_addr_copy(net_dev->dev_addr, old_addr);
                        return rc;
                }
        }

        /* Reconfigure the MAC */
        mutex_lock(&efx->mac_lock);
        efx_mac_reconfigure(efx);
        mutex_unlock(&efx->mac_lock);

        return 0;
}

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

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

static int efx_set_features(struct net_device *net_dev, netdev_features_t data)
{
        struct efx_nic *efx = netdev_priv(net_dev);
        int rc;

        /* If disabling RX n-tuple filtering, clear existing filters */
        if (net_dev->features & ~data & NETIF_F_NTUPLE) {
                rc = efx->type->filter_clear_rx(efx, EFX_FILTER_PRI_MANUAL);
                if (rc)
                        return rc;
        }

        /* If Rx VLAN filter is changed, update filters via mac_reconfigure.
         * If rx-fcs is changed, mac_reconfigure updates that too.
         */
        if ((net_dev->features ^ data) & (NETIF_F_HW_VLAN_CTAG_FILTER |
                                          NETIF_F_RXFCS)) {
                /* efx_set_rx_mode() will schedule MAC work to update filters
                 * when a new features are finally set in net_dev.
                 */
                efx_set_rx_mode(net_dev);
        }

        return 0;
}

static int efx_get_phys_port_id(struct net_device *net_dev,
                                struct netdev_phys_item_id *ppid)
{
        struct efx_nic *efx = netdev_priv(net_dev);

        if (efx->type->get_phys_port_id)
                return efx->type->get_phys_port_id(efx, ppid);
        else
                return -EOPNOTSUPP;
}

static int efx_get_phys_port_name(struct net_device *net_dev,
                                  char *name, size_t len)
{
        struct efx_nic *efx = netdev_priv(net_dev);

        if (snprintf(name, len, "p%u", efx->port_num) >= len)
                return -EINVAL;
        return 0;
}

static int efx_vlan_rx_add_vid(struct net_device *net_dev, __be16 proto, u16 vid)
{
        struct efx_nic *efx = netdev_priv(net_dev);

        if (efx->type->vlan_rx_add_vid)
                return efx->type->vlan_rx_add_vid(efx, proto, vid);
        else
                return -EOPNOTSUPP;
}

static int efx_vlan_rx_kill_vid(struct net_device *net_dev, __be16 proto, u16 vid)
{
        struct efx_nic *efx = netdev_priv(net_dev);

        if (efx->type->vlan_rx_kill_vid)
                return efx->type->vlan_rx_kill_vid(efx, proto, vid);
        else
                return -EOPNOTSUPP;
}

static int efx_udp_tunnel_type_map(enum udp_parsable_tunnel_type in)
{
        switch (in) {
        case UDP_TUNNEL_TYPE_VXLAN:
                return TUNNEL_ENCAP_UDP_PORT_ENTRY_VXLAN;
        case UDP_TUNNEL_TYPE_GENEVE:
                return TUNNEL_ENCAP_UDP_PORT_ENTRY_GENEVE;
        default:
                return -1;
        }
}

static void efx_udp_tunnel_add(struct net_device *dev, struct udp_tunnel_info *ti)
{
        struct efx_nic *efx = netdev_priv(dev);
        struct efx_udp_tunnel tnl;
        int efx_tunnel_type;

        efx_tunnel_type = efx_udp_tunnel_type_map(ti->type);
        if (efx_tunnel_type < 0)
                return;

        tnl.type = (u16)efx_tunnel_type;
        tnl.port = ti->port;

        if (efx->type->udp_tnl_add_port)
                (void)efx->type->udp_tnl_add_port(efx, tnl);
}

static void efx_udp_tunnel_del(struct net_device *dev, struct udp_tunnel_info *ti)
{
        struct efx_nic *efx = netdev_priv(dev);
        struct efx_udp_tunnel tnl;
        int efx_tunnel_type;

        efx_tunnel_type = efx_udp_tunnel_type_map(ti->type);
        if (efx_tunnel_type < 0)
                return;

        tnl.type = (u16)efx_tunnel_type;
        tnl.port = ti->port;

        if (efx->type->udp_tnl_del_port)
                (void)efx->type->udp_tnl_del_port(efx, tnl);
}

static const struct net_device_ops efx_netdev_ops = {
        .ndo_open               = efx_net_open,
        .ndo_stop               = efx_net_stop,
        .ndo_get_stats64        = efx_net_stats,
        .ndo_tx_timeout         = efx_watchdog,
        .ndo_start_xmit         = efx_hard_start_xmit,
        .ndo_validate_addr      = eth_validate_addr,
        .ndo_do_ioctl           = efx_ioctl,
        .ndo_change_mtu         = efx_change_mtu,
        .ndo_set_mac_address    = efx_set_mac_address,
        .ndo_set_rx_mode        = efx_set_rx_mode,
        .ndo_set_features       = efx_set_features,
        .ndo_vlan_rx_add_vid    = efx_vlan_rx_add_vid,
        .ndo_vlan_rx_kill_vid   = efx_vlan_rx_kill_vid,
#ifdef CONFIG_SFC_SRIOV
        .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,
        .ndo_set_vf_link_state  = efx_sriov_set_vf_link_state,
#endif
        .ndo_get_phys_port_id   = efx_get_phys_port_id,
        .ndo_get_phys_port_name = efx_get_phys_port_name,
        .ndo_setup_tc           = efx_setup_tc,
#ifdef CONFIG_RFS_ACCEL
        .ndo_rx_flow_steer      = efx_filter_rfs,
#endif
        .ndo_udp_tunnel_add     = efx_udp_tunnel_add,
        .ndo_udp_tunnel_del     = efx_udp_tunnel_del,
        .ndo_xdp_xmit           = efx_xdp_xmit,
        .ndo_bpf                = efx_xdp
};

static int efx_xdp_setup_prog(struct efx_nic *efx, struct bpf_prog *prog)
{
        struct bpf_prog *old_prog;

        if (efx->xdp_rxq_info_failed) {
                netif_err(efx, drv, efx->net_dev,
                          "Unable to bind XDP program due to previous failure of rxq_info\n");
                return -EINVAL;
        }

        if (prog && efx->net_dev->mtu > efx_xdp_max_mtu(efx)) {
                netif_err(efx, drv, efx->net_dev,
                          "Unable to configure XDP with MTU of %d (max: %d)\n",
                          efx->net_dev->mtu, efx_xdp_max_mtu(efx));
                return -EINVAL;
        }

        old_prog = rtnl_dereference(efx->xdp_prog);
        rcu_assign_pointer(efx->xdp_prog, prog);
        /* Release the reference that was originally passed by the caller. */
        if (old_prog)
                bpf_prog_put(old_prog);

        return 0;
}

/* Context: process, rtnl_lock() held. */
static int efx_xdp(struct net_device *dev, struct netdev_bpf *xdp)
{
        struct efx_nic *efx = netdev_priv(dev);
        struct bpf_prog *xdp_prog;

        switch (xdp->command) {
        case XDP_SETUP_PROG:
                return efx_xdp_setup_prog(efx, xdp->prog);
        case XDP_QUERY_PROG:
                xdp_prog = rtnl_dereference(efx->xdp_prog);
                xdp->prog_id = xdp_prog ? xdp_prog->aux->id : 0;
                return 0;
        default:
                return -EINVAL;
        }
}

static int efx_xdp_xmit(struct net_device *dev, int n, struct xdp_frame **xdpfs,
                        u32 flags)
{
        struct efx_nic *efx = netdev_priv(dev);

        if (!netif_running(dev))
                return -EINVAL;

        return efx_xdp_tx_buffers(efx, n, xdpfs, flags & XDP_XMIT_FLUSH);
}

static void efx_update_name(struct efx_nic *efx)
{
        strcpy(efx->name, efx->net_dev->name);
        efx_mtd_rename(efx);
        efx_set_channel_names(efx);
}

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

        if ((net_dev->netdev_ops == &efx_netdev_ops) &&
            event == NETDEV_CHANGENAME)
                efx_update_name(netdev_priv(net_dev));

        return NOTIFY_DONE;
}

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

static ssize_t
show_phy_type(struct device *dev, struct device_attribute *attr, char *buf)
{
        struct efx_nic *efx = dev_get_drvdata(dev);
        return sprintf(buf, "%d\n", efx->phy_type);
}
static DEVICE_ATTR(phy_type, 0444, show_phy_type, NULL);

static int efx_register_netdev(struct efx_nic *efx)
{
        struct net_device *net_dev = efx->net_dev;
        struct efx_channel *channel;
        int rc;

        net_dev->watchdog_timeo = 5 * HZ;
        net_dev->irq = efx->pci_dev->irq;
        net_dev->netdev_ops = &efx_netdev_ops;
        if (efx_nic_rev(efx) >= EFX_REV_HUNT_A0)
                net_dev->priv_flags |= IFF_UNICAST_FLT;
        net_dev->ethtool_ops = &efx_ethtool_ops;
        net_dev->gso_max_segs = EFX_TSO_MAX_SEGS;
        net_dev->min_mtu = EFX_MIN_MTU;
        net_dev->max_mtu = EFX_MAX_MTU;

        rtnl_lock();

        /* 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;
        }

        rc = dev_alloc_name(net_dev, net_dev->name);
        if (rc < 0)
                goto fail_locked;
        efx_update_name(efx);

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

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

        efx_for_each_channel(channel, efx) {
                struct efx_tx_queue *tx_queue;
                efx_for_each_channel_tx_queue(tx_queue, channel)
                        efx_init_tx_queue_core_txq(tx_queue);
        }

        efx_associate(efx);

        rtnl_unlock();

        rc = device_create_file(&efx->pci_dev->dev, &dev_attr_phy_type);
        if (rc) {
                netif_err(efx, drv, efx->net_dev,
                          "failed to init net dev attributes\n");
                goto fail_registered;
        }

        efx_init_mcdi_logging(efx);

        return 0;

fail_registered:
        rtnl_lock();
        efx_dissociate(efx);
        unregister_netdevice(net_dev);
fail_locked:
        efx->state = STATE_UNINIT;
        rtnl_unlock();
        netif_err(efx, drv, efx->net_dev, "could not register net dev\n");
        return rc;
}

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

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

        if (efx_dev_registered(efx)) {
                strlcpy(efx->name, pci_name(efx->pci_dev), sizeof(efx->name));
                efx_fini_mcdi_logging(efx);
                device_remove_file(&efx->pci_dev->dev, &dev_attr_phy_type);
                unregister_netdev(efx->net_dev);
        }
}

/**************************************************************************
 *

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

/* PCI device ID table */
static const struct pci_device_id efx_pci_table[] = {
        {PCI_DEVICE(PCI_VENDOR_ID_SOLARFLARE, 0x0803),  /* SFC9020 */
         .driver_data = (unsigned long) &siena_a0_nic_type},
        {PCI_DEVICE(PCI_VENDOR_ID_SOLARFLARE, 0x0813),  /* SFL9021 */
         .driver_data = (unsigned long) &siena_a0_nic_type},
        {PCI_DEVICE(PCI_VENDOR_ID_SOLARFLARE, 0x0903),  /* SFC9120 PF */
         .driver_data = (unsigned long) &efx_hunt_a0_nic_type},
        {PCI_DEVICE(PCI_VENDOR_ID_SOLARFLARE, 0x1903),  /* SFC9120 VF */
         .driver_data = (unsigned long) &efx_hunt_a0_vf_nic_type},
        {PCI_DEVICE(PCI_VENDOR_ID_SOLARFLARE, 0x0923),  /* SFC9140 PF */
         .driver_data = (unsigned long) &efx_hunt_a0_nic_type},
        {PCI_DEVICE(PCI_VENDOR_ID_SOLARFLARE, 0x1923),  /* SFC9140 VF */
         .driver_data = (unsigned long) &efx_hunt_a0_vf_nic_type},
        {PCI_DEVICE(PCI_VENDOR_ID_SOLARFLARE, 0x0a03),  /* SFC9220 PF */
         .driver_data = (unsigned long) &efx_hunt_a0_nic_type},
        {PCI_DEVICE(PCI_VENDOR_ID_SOLARFLARE, 0x1a03),  /* SFC9220 VF */
         .driver_data = (unsigned long) &efx_hunt_a0_vf_nic_type},
        {PCI_DEVICE(PCI_VENDOR_ID_SOLARFLARE, 0x0b03),  /* SFC9250 PF */
         .driver_data = (unsigned long) &efx_hunt_a0_nic_type},
        {PCI_DEVICE(PCI_VENDOR_ID_SOLARFLARE, 0x1b03),  /* SFC9250 VF */
         .driver_data = (unsigned long) &efx_hunt_a0_vf_nic_type},
        {0}                     /* end of list */
};

/**************************************************************************
 *
 * Data housekeeping
 *
 **************************************************************************/

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);
}

/**************************************************************************
 *
 * 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)
{
        /* Flush reset_work. It can no longer be scheduled since we
         * are not READY.
         */
        BUG_ON(efx->state == STATE_READY);
        efx_flush_reset_workqueue(efx);

        efx_disable_interrupts(efx);
        efx_clear_interrupt_affinity(efx);
        efx_nic_fini_interrupt(efx);
        efx_fini_port(efx);
        efx->type->fini(efx);
        efx_fini_napi(efx);
        efx_remove_all(efx);
}

/* Final NIC shutdown
 * This is called only at module unload (or hotplug removal).  A PF can call
 * this on its VFs to ensure they are unbound first.
 */
static void efx_pci_remove(struct pci_dev *pci_dev)
{
        struct efx_nic *efx;

        efx = pci_get_drvdata(pci_dev);
        if (!efx)
                return;

        /* Mark the NIC as fini, then stop the interface */
        rtnl_lock();
        efx_dissociate(efx);
        dev_close(efx->net_dev);
        efx_disable_interrupts(efx);
        efx->state = STATE_UNINIT;
        rtnl_unlock();

        if (efx->type->sriov_fini)
                efx->type->sriov_fini(efx);

        efx_unregister_netdev(efx);

        efx_mtd_remove(efx);

        efx_pci_remove_main(efx);

        efx_fini_io(efx, efx->type->mem_bar(efx));
        netif_dbg(efx, drv, efx->net_dev, "shutdown successful\n");

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

        pci_disable_pcie_error_reporting(pci_dev);
};

/* 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
static void efx_probe_vpd_strings(struct efx_nic *efx)
{
        struct pci_dev *dev = efx->pci_dev;
        char vpd_data[SFC_VPD_LEN];
        ssize_t vpd_size;
        int ro_start, ro_size, i, j;

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

        ro_size = pci_vpd_lrdt_size(&vpd_data[ro_start]);
        j = ro_size;
        i = ro_start + PCI_VPD_LRDT_TAG_SIZE;
        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]);

        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]);
}


/* Main body of NIC initialisation
 * This is called at module load (or hotplug insertion, theoretically).
 */
static int efx_pci_probe_main(struct efx_nic *efx)
{
        int rc;

        /* Do start-of-day initialisation */
        rc = efx_probe_all(efx);
        if (rc)
                goto fail1;

        efx_init_napi(efx);

        down_write(&efx->filter_sem);
        rc = efx->type->init(efx);
        up_write(&efx->filter_sem);
        if (rc) {
                netif_err(efx, probe, efx->net_dev,
                          "failed to initialise NIC\n");
                goto fail3;
        }

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

        rc = efx_nic_init_interrupt(efx);
        if (rc)
                goto fail5;

        efx_set_interrupt_affinity(efx);
        rc = efx_enable_interrupts(efx);
        if (rc)
                goto fail6;

        return 0;

 fail6:
        efx_clear_interrupt_affinity(efx);
        efx_nic_fini_interrupt(efx);
 fail5:
        efx_fini_port(efx);
 fail4:
        efx->type->fini(efx);
 fail3:
        efx_fini_napi(efx);
        efx_remove_all(efx);
 fail1:
        return rc;
}

static int efx_pci_probe_post_io(struct efx_nic *efx)
{
        struct net_device *net_dev = efx->net_dev;
        int rc = efx_pci_probe_main(efx);

        if (rc)
                return rc;

        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);
        }

        /* Determine netdevice features */
        net_dev->features |= (efx->type->offload_features | NETIF_F_SG |
                              NETIF_F_TSO | NETIF_F_RXCSUM | NETIF_F_RXALL);
        if (efx->type->offload_features & (NETIF_F_IPV6_CSUM | NETIF_F_HW_CSUM))
                net_dev->features |= NETIF_F_TSO6;
        /* Check whether device supports TSO */
        if (!efx->type->tso_versions || !efx->type->tso_versions(efx))
                net_dev->features &= ~NETIF_F_ALL_TSO;
        /* Mask for features that also apply to VLAN devices */
        net_dev->vlan_features |= (NETIF_F_HW_CSUM | NETIF_F_SG |
                                   NETIF_F_HIGHDMA | NETIF_F_ALL_TSO |
                                   NETIF_F_RXCSUM);

        net_dev->hw_features |= net_dev->features & ~efx->fixed_features;

        /* Disable receiving frames with bad FCS, by default. */
        net_dev->features &= ~NETIF_F_RXALL;

        /* Disable VLAN filtering by default.  It may be enforced if
         * the feature is fixed (i.e. VLAN filters are required to
         * receive VLAN tagged packets due to vPort restrictions).
         */
        net_dev->features &= ~NETIF_F_HW_VLAN_CTAG_FILTER;
        net_dev->features |= efx->fixed_features;

        rc = efx_register_netdev(efx);
        if (!rc)
                return 0;

        efx_pci_remove_main(efx);
        return rc;
}

/* NIC initialisation
 *
 * This is called at module load (or hotplug insertion,
 * theoretically).  It sets up PCI mappings, resets the NIC,
 * sets up and registers the network devices with the kernel and hooks
 * the interrupt service routine.  It does not prepare the device for
 * transmission; this is left to the first time one of the network
 * interfaces is brought up (i.e. efx_net_open).
 */
static int efx_pci_probe(struct pci_dev *pci_dev,
                         const struct pci_device_id *entry)
{
        struct net_device *net_dev;
        struct efx_nic *efx;
        int rc;

        /* Allocate and initialise a struct net_device and struct efx_nic */
        net_dev = alloc_etherdev_mqs(sizeof(*efx), EFX_MAX_CORE_TX_QUEUES,
                                     EFX_MAX_RX_QUEUES);
        if (!net_dev)
                return -ENOMEM;
        efx = netdev_priv(net_dev);
        efx->type = (const struct efx_nic_type *) entry->driver_data;
        efx->fixed_features |= NETIF_F_HIGHDMA;

        pci_set_drvdata(pci_dev, efx);
        SET_NETDEV_DEV(net_dev, &pci_dev->dev);
        rc = efx_init_struct(efx, pci_dev, net_dev);
        if (rc)
                goto fail1;

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

        if (!efx->type->is_vf)
                efx_probe_vpd_strings(efx);

        /* Set up basic I/O (BAR mappings etc) */
        rc = efx_init_io(efx, efx->type->mem_bar(efx), efx->type->max_dma_mask,
                         efx->type->mem_map_size(efx));
        if (rc)
                goto fail2;

        rc = efx_pci_probe_post_io(efx);
        if (rc) {
                /* On failure, retry once immediately.
                 * If we aborted probe due to a scheduled reset, dismiss it.
                 */
                efx->reset_pending = 0;
                rc = efx_pci_probe_post_io(efx);
                if (rc) {
                        /* On another failure, retry once more
                         * after a 50-305ms delay.
                         */
                        unsigned char r;

                        get_random_bytes(&r, 1);
                        msleep((unsigned int)r + 50);
                        efx->reset_pending = 0;
                        rc = efx_pci_probe_post_io(efx);
                }
        }
        if (rc)
                goto fail3;

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

        /* Try to create MTDs, but allow this to fail */
        rtnl_lock();
        rc = efx_mtd_probe(efx);
        rtnl_unlock();
        if (rc && rc != -EPERM)
                netif_warn(efx, probe, efx->net_dev,
                           "failed to create MTDs (%d)\n", rc);

        (void)pci_enable_pcie_error_reporting(pci_dev);

        if (efx->type->udp_tnl_push_ports)
                efx->type->udp_tnl_push_ports(efx);

        return 0;

 fail3:
        efx_fini_io(efx, efx->type->mem_bar(efx));
 fail2:
        efx_fini_struct(efx);
 fail1:
        WARN_ON(rc > 0);
        netif_dbg(efx, drv, efx->net_dev, "initialisation failed. rc=%d\n", rc);
        free_netdev(net_dev);
        return rc;
}

/* 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

static int efx_pm_freeze(struct device *dev)
{
        struct efx_nic *efx = dev_get_drvdata(dev);

        rtnl_lock();

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

                efx_device_detach_sync(efx);

                efx_stop_all(efx);
                efx_disable_interrupts(efx);
        }

        rtnl_unlock();

        return 0;
}

static int efx_pm_thaw(struct device *dev)
{
        int rc;
        struct efx_nic *efx = dev_get_drvdata(dev);

        rtnl_lock();

        if (efx->state != STATE_DISABLED) {
                rc = efx_enable_interrupts(efx);
                if (rc)
                        goto fail;

                mutex_lock(&efx->mac_lock);
                efx->phy_op->reconfigure(efx);
                mutex_unlock(&efx->mac_lock);

                efx_start_all(efx);

                efx_device_attach_if_not_resetting(efx);

                efx->state = STATE_READY;

                efx->type->resume_wol(efx);
        }

        rtnl_unlock();

        /* Reschedule any quenched resets scheduled during efx_pm_freeze() */
        efx_queue_reset_work(efx);

        return 0;

fail:
        rtnl_unlock();

        return rc;
}

static int efx_pm_poweroff(struct device *dev)
{
        struct pci_dev *pci_dev = to_pci_dev(dev);
        struct efx_nic *efx = pci_get_drvdata(pci_dev);

        efx->type->fini(efx);

        efx->reset_pending = 0;

        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;
        down_write(&efx->filter_sem);
        rc = efx->type->init(efx);
        up_write(&efx->filter_sem);
        if (rc)
                return rc;
        rc = efx_pm_thaw(dev);
        return rc;
}

static int efx_pm_suspend(struct device *dev)
{
        int rc;

        efx_pm_freeze(dev);
        rc = efx_pm_poweroff(dev);
        if (rc)
                efx_pm_resume(dev);
        return rc;
}

static const struct dev_pm_ops efx_pm_ops = {
        .suspend        = efx_pm_suspend,
        .resume         = efx_pm_resume,
        .freeze         = efx_pm_freeze,
        .thaw           = efx_pm_thaw,
        .poweroff       = efx_pm_poweroff,
        .restore        = efx_pm_resume,
};

/* 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.
 */
static pci_ers_result_t efx_io_error_detected(struct pci_dev *pdev,
                                              enum pci_channel_state state)
{
        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);
                efx_disable_interrupts(efx);

                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;
}

/* Fake a successful reset, which will be performed later in efx_io_resume. */
static pci_ers_result_t efx_io_slot_reset(struct pci_dev *pdev)
{
        struct efx_nic *efx = pci_get_drvdata(pdev);
        pci_ers_result_t status = PCI_ERS_RESULT_RECOVERED;

        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;
        }

        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 const struct pci_error_handlers efx_err_handlers = {
        .error_detected = efx_io_error_detected,
        .slot_reset     = efx_io_slot_reset,
        .resume         = efx_io_resume,
};

static struct pci_driver efx_pci_driver = {
        .name           = KBUILD_MODNAME,
        .id_table       = efx_pci_table,
        .probe          = efx_pci_probe,
        .remove         = efx_pci_remove,
        .driver.pm      = &efx_pm_ops,
        .err_handler    = &efx_err_handlers,
#ifdef CONFIG_SFC_SRIOV
        .sriov_configure = efx_pci_sriov_configure,
#endif
};

/**************************************************************************
 *
 * Kernel module interface
 *
 *************************************************************************/

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;

#ifdef CONFIG_SFC_SRIOV
        rc = efx_init_sriov();
        if (rc)
                goto err_sriov;
#endif

        rc = efx_create_reset_workqueue();
        if (rc)
                goto err_reset;

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

        return 0;

 err_pci:
        efx_destroy_reset_workqueue();
 err_reset:
#ifdef CONFIG_SFC_SRIOV
        efx_fini_sriov();
 err_sriov:
#endif
        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);
        efx_destroy_reset_workqueue();
#ifdef CONFIG_SFC_SRIOV
        efx_fini_sriov();
#endif
        unregister_netdevice_notifier(&efx_netdev_notifier);

}

module_init(efx_init_module);
module_exit(efx_exit_module);

MODULE_AUTHOR("Solarflare Communications and "
              "Michael Brown <mbrown@fensystems.co.uk>");
MODULE_DESCRIPTION("Solarflare network driver");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, efx_pci_table);
MODULE_VERSION(EFX_DRIVER_VERSION);