// SPDX-License-Identifier: GPL-2.0-only /**************************************************************************** * Driver for Solarflare network controllers and boards * Copyright 2018 Solarflare Communications Inc. * * 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 "net_driver.h" #include #include #include #include #include "efx_common.h" #include "efx_channels.h" #include "efx.h" #include "mcdi.h" #include "selftest.h" #include "rx_common.h" #include "tx_common.h" #include "nic.h" #include "mcdi_port_common.h" #include "io.h" #include "mcdi_pcol.h" #include "ef100_rep.h" static unsigned int 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"); /* This is the time (in jiffies) between invocations of the hardware * monitor. */ static unsigned int efx_monitor_interval = 1 * HZ; /* 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 /* Default stats update time */ #define STATS_PERIOD_MS_DEFAULT 1000 static const unsigned int efx_reset_type_max = RESET_TYPE_MAX; static const char *const efx_reset_type_names[] = { [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", [RESET_TYPE_DATAPATH] = "DATAPATH", [RESET_TYPE_MC_BIST] = "MC_BIST", [RESET_TYPE_DISABLE] = "DISABLE", [RESET_TYPE_TX_WATCHDOG] = "TX_WATCHDOG", [RESET_TYPE_INT_ERROR] = "INT_ERROR", [RESET_TYPE_DMA_ERROR] = "DMA_ERROR", [RESET_TYPE_TX_SKIP] = "TX_SKIP", [RESET_TYPE_MC_FAILURE] = "MC_FAILURE", [RESET_TYPE_MCDI_TIMEOUT] = "MCDI_TIMEOUT (FLR)", }; #define RESET_TYPE(type) \ STRING_TABLE_LOOKUP(type, efx_reset_type) /* Loopback mode names (see LOOPBACK_MODE()) */ const unsigned int efx_loopback_mode_max = LOOPBACK_MAX; const char *const efx_loopback_mode_names[] = { [LOOPBACK_NONE] = "NONE", [LOOPBACK_DATA] = "DATAPATH", [LOOPBACK_GMAC] = "GMAC", [LOOPBACK_XGMII] = "XGMII", [LOOPBACK_XGXS] = "XGXS", [LOOPBACK_XAUI] = "XAUI", [LOOPBACK_GMII] = "GMII", [LOOPBACK_SGMII] = "SGMII", [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", [LOOPBACK_GPHY] = "GPHY", [LOOPBACK_PHYXS] = "PHYXS", [LOOPBACK_PCS] = "PCS", [LOOPBACK_PMAPMD] = "PMA/PMD", [LOOPBACK_XPORT] = "XPORT", [LOOPBACK_XGMII_WS] = "XGMII_WS", [LOOPBACK_XAUI_WS] = "XAUI_WS", [LOOPBACK_XAUI_WS_FAR] = "XAUI_WS_FAR", [LOOPBACK_XAUI_WS_NEAR] = "XAUI_WS_NEAR", [LOOPBACK_GMII_WS] = "GMII_WS", [LOOPBACK_XFI_WS] = "XFI_WS", [LOOPBACK_XFI_WS_FAR] = "XFI_WS_FAR", [LOOPBACK_PHYXS_WS] = "PHYXS_WS", }; /* 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; int efx_create_reset_workqueue(void) { reset_workqueue = create_singlethread_workqueue("sfc_reset"); if (!reset_workqueue) { printk(KERN_ERR "Failed to create reset workqueue\n"); return -ENOMEM; } return 0; } void efx_queue_reset_work(struct efx_nic *efx) { queue_work(reset_workqueue, &efx->reset_work); } void efx_flush_reset_workqueue(struct efx_nic *efx) { cancel_work_sync(&efx->reset_work); } void efx_destroy_reset_workqueue(void) { if (reset_workqueue) { destroy_workqueue(reset_workqueue); reset_workqueue = NULL; } } /* 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, bool mtu_only) { if (efx->type->reconfigure_mac) { down_read(&efx->filter_sem); efx->type->reconfigure_mac(efx, mtu_only); up_read(&efx->filter_sem); } } /* Asynchronous work item for changing MAC promiscuity and multicast * hash. Avoid a drain/rx_ingress enable by reconfiguring the current * MAC directly. */ 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); if (efx->port_enabled) efx_mac_reconfigure(efx, false); mutex_unlock(&efx->mac_lock); } int efx_set_mac_address(struct net_device *net_dev, void *data) { struct efx_nic *efx = 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); eth_hw_addr_set(net_dev, new_addr); if (efx->type->set_mac_address) { rc = efx->type->set_mac_address(efx); if (rc) { eth_hw_addr_set(net_dev, old_addr); return rc; } } /* Reconfigure the MAC */ mutex_lock(&efx->mac_lock); efx_mac_reconfigure(efx, false); mutex_unlock(&efx->mac_lock); return 0; } /* Context: netif_addr_lock held, BHs disabled. */ void efx_set_rx_mode(struct net_device *net_dev) { struct efx_nic *efx = efx_netdev_priv(net_dev); if (efx->port_enabled) queue_work(efx->workqueue, &efx->mac_work); /* Otherwise efx_start_port() will do this */ } int efx_set_features(struct net_device *net_dev, netdev_features_t data) { struct efx_nic *efx = 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; } /* 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. */ void efx_link_status_changed(struct efx_nic *efx) { struct efx_link_state *link_state = &efx->link_state; /* 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; if (link_state->up != netif_carrier_ok(efx->net_dev)) { efx->n_link_state_changes++; if (link_state->up) netif_carrier_on(efx->net_dev); else netif_carrier_off(efx->net_dev); } /* Status message for kernel log */ if (link_state->up) netif_info(efx, link, efx->net_dev, "link up at %uMbps %s-duplex (MTU %d)\n", link_state->speed, link_state->fd ? "full" : "half", efx->net_dev->mtu); else netif_info(efx, link, efx->net_dev, "link down\n"); } unsigned int efx_xdp_max_mtu(struct efx_nic *efx) { /* The maximum MTU that we can fit in a single page, allowing for * framing, overhead and XDP headroom + tailroom. */ int overhead = EFX_MAX_FRAME_LEN(0) + sizeof(struct efx_rx_page_state) + efx->rx_prefix_size + efx->type->rx_buffer_padding + efx->rx_ip_align + EFX_XDP_HEADROOM + EFX_XDP_TAILROOM; return PAGE_SIZE - overhead; } /* Context: process, rtnl_lock() held. */ int efx_change_mtu(struct net_device *net_dev, int new_mtu) { struct efx_nic *efx = efx_netdev_priv(net_dev); int rc; rc = efx_check_disabled(efx); if (rc) return rc; if (rtnl_dereference(efx->xdp_prog) && new_mtu > efx_xdp_max_mtu(efx)) { netif_err(efx, drv, efx->net_dev, "Requested MTU of %d too big for XDP (max: %d)\n", new_mtu, efx_xdp_max_mtu(efx)); return -EINVAL; } netif_dbg(efx, drv, efx->net_dev, "changing MTU to %d\n", new_mtu); efx_device_detach_sync(efx); efx_stop_all(efx); mutex_lock(&efx->mac_lock); WRITE_ONCE(net_dev->mtu, new_mtu); efx_mac_reconfigure(efx, true); mutex_unlock(&efx->mac_lock); efx_start_all(efx); efx_device_attach_if_not_resetting(efx); return 0; } /************************************************************************** * * Hardware monitor * **************************************************************************/ /* Run periodically off the general workqueue */ static void efx_monitor(struct work_struct *data) { struct efx_nic *efx = container_of(data, struct efx_nic, monitor_work.work); netif_vdbg(efx, timer, efx->net_dev, "hardware monitor executing on CPU %d\n", raw_smp_processor_id()); BUG_ON(efx->type->monitor == NULL); /* If the mac_lock is already held then it is likely a port * reconfiguration is already in place, which will likely do * most of the work of monitor() anyway. */ if (mutex_trylock(&efx->mac_lock)) { if (efx->port_enabled && efx->type->monitor) efx->type->monitor(efx); mutex_unlock(&efx->mac_lock); } efx_start_monitor(efx); } void efx_start_monitor(struct efx_nic *efx) { if (efx->type->monitor) queue_delayed_work(efx->workqueue, &efx->monitor_work, efx_monitor_interval); } /************************************************************************** * * Event queue processing * *************************************************************************/ /* Channels are shutdown and reinitialised whilst the NIC is running * to propagate configuration changes (mtu, checksum offload), or * to clear hardware error conditions */ static void efx_start_datapath(struct efx_nic *efx) { netdev_features_t old_features = efx->net_dev->features; bool old_rx_scatter = efx->rx_scatter; size_t rx_buf_len; /* Calculate the rx buffer allocation parameters required to * support the current MTU, including padding for header * alignment and overruns. */ efx->rx_dma_len = (efx->rx_prefix_size + EFX_MAX_FRAME_LEN(efx->net_dev->mtu) + efx->type->rx_buffer_padding); rx_buf_len = (sizeof(struct efx_rx_page_state) + EFX_XDP_HEADROOM + efx->rx_ip_align + efx->rx_dma_len + EFX_XDP_TAILROOM); if (rx_buf_len <= PAGE_SIZE) { efx->rx_scatter = efx->type->always_rx_scatter; efx->rx_buffer_order = 0; } else if (efx->type->can_rx_scatter) { BUILD_BUG_ON(EFX_RX_USR_BUF_SIZE % L1_CACHE_BYTES); BUILD_BUG_ON(sizeof(struct efx_rx_page_state) + 2 * ALIGN(NET_IP_ALIGN + EFX_RX_USR_BUF_SIZE, EFX_RX_BUF_ALIGNMENT) > PAGE_SIZE); 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); } 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); /* Restore previously fixed features in hw_features and remove * features which are fixed now */ efx->net_dev->hw_features |= efx->net_dev->features; efx->net_dev->hw_features &= ~efx->fixed_features; efx->net_dev->features |= efx->fixed_features; if (efx->net_dev->features != old_features) netdev_features_change(efx->net_dev); /* RX filters may also have scatter-enabled flags */ if ((efx->rx_scatter != old_rx_scatter) && efx->type->filter_update_rx_scatter) efx->type->filter_update_rx_scatter(efx); /* 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; /* Initialise the channels */ efx_start_channels(efx); efx_ptp_start_datapath(efx); if (netif_device_present(efx->net_dev)) netif_tx_wake_all_queues(efx->net_dev); } static void efx_stop_datapath(struct efx_nic *efx) { EFX_ASSERT_RESET_SERIALISED(efx); BUG_ON(efx->port_enabled); efx_ptp_stop_datapath(efx); efx_stop_channels(efx); } /************************************************************************** * * 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_start_port(struct efx_nic *efx) { netif_dbg(efx, ifup, efx->net_dev, "start port\n"); BUG_ON(efx->port_enabled); mutex_lock(&efx->mac_lock); efx->port_enabled = true; /* Ensure MAC ingress/egress is enabled */ efx_mac_reconfigure(efx, false); mutex_unlock(&efx->mac_lock); } /* 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. */ static void efx_stop_port(struct efx_nic *efx) { netif_dbg(efx, ifdown, efx->net_dev, "stop port\n"); EFX_ASSERT_RESET_SERIALISED(efx); mutex_lock(&efx->mac_lock); efx->port_enabled = false; mutex_unlock(&efx->mac_lock); /* Serialise against efx_set_multicast_list() */ netif_addr_lock_bh(efx->net_dev); netif_addr_unlock_bh(efx->net_dev); cancel_delayed_work_sync(&efx->monitor_work); efx_selftest_async_cancel(efx); cancel_work_sync(&efx->mac_work); } /* 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. */ void efx_start_all(struct efx_nic *efx) { EFX_ASSERT_RESET_SERIALISED(efx); BUG_ON(efx->state == STATE_DISABLED); /* Check that it is appropriate to restart the interface. All * of these flags are safe to read under just the rtnl lock */ if (efx->port_enabled || !netif_running(efx->net_dev) || efx->reset_pending) return; efx_start_port(efx); efx_start_datapath(efx); /* Start the hardware monitor if there is one */ efx_start_monitor(efx); efx_selftest_async_start(efx); /* Link state detection is normally event-driven; we have * to poll now because we could have missed a change */ mutex_lock(&efx->mac_lock); if (efx_mcdi_phy_poll(efx)) efx_link_status_changed(efx); mutex_unlock(&efx->mac_lock); if (efx->type->start_stats) { efx->type->start_stats(efx); efx->type->pull_stats(efx); spin_lock_bh(&efx->stats_lock); efx->type->update_stats(efx, NULL, NULL); spin_unlock_bh(&efx->stats_lock); } } /* 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. */ 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; if (efx->type->update_stats) { /* 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); efx->type->stop_stats(efx); } efx_stop_port(efx); /* 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)); netif_tx_disable(efx->net_dev); efx_stop_datapath(efx); } /* Context: process, rcu_read_lock or RTNL held, non-blocking. */ void efx_net_stats(struct net_device *net_dev, struct rtnl_link_stats64 *stats) { struct efx_nic *efx = efx_netdev_priv(net_dev); spin_lock_bh(&efx->stats_lock); efx_nic_update_stats_atomic(efx, NULL, stats); spin_unlock_bh(&efx->stats_lock); } /* 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) { enum efx_phy_mode phy_mode; int rc = 0; WARN_ON(!mutex_is_locked(&efx->mac_lock)); /* Disable PHY transmit in mac level loopbacks */ phy_mode = efx->phy_mode; if (LOOPBACK_INTERNAL(efx)) efx->phy_mode |= PHY_MODE_TX_DISABLED; else efx->phy_mode &= ~PHY_MODE_TX_DISABLED; if (efx->type->reconfigure_port) rc = efx->type->reconfigure_port(efx); if (rc) efx->phy_mode = phy_mode; return rc; } /************************************************************************** * * Device reset and suspend * **************************************************************************/ 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; } /* Try recovery mechanisms. * For now only EEH is supported. * Returns 0 if the recovery mechanisms are unsuccessful. * Returns a non-zero value otherwise. */ int efx_try_recovery(struct efx_nic *efx) { #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. */ struct eeh_dev *eehdev = pci_dev_to_eeh_dev(efx->pci_dev); if (eeh_dev_check_failure(eehdev)) { /* The EEH mechanisms will handle the error and reset the * device if necessary. */ return 1; } #endif return 0; } /* Tears down the entire software state and most of the hardware state * before reset. */ void efx_reset_down(struct efx_nic *efx, enum reset_type method) { EFX_ASSERT_RESET_SERIALISED(efx); if (method == RESET_TYPE_MCDI_TIMEOUT) efx->type->prepare_flr(efx); efx_stop_all(efx); efx_disable_interrupts(efx); mutex_lock(&efx->mac_lock); down_write(&efx->filter_sem); mutex_lock(&efx->net_dev->ethtool->rss_lock); efx->type->fini(efx); } /* Context: netif_tx_lock held, BHs disabled. */ void efx_watchdog(struct net_device *net_dev, unsigned int txqueue) { struct efx_nic *efx = 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); } /* 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. */ int efx_reset_up(struct efx_nic *efx, enum reset_type method, bool ok) { int rc; EFX_ASSERT_RESET_SERIALISED(efx); if (method == RESET_TYPE_MCDI_TIMEOUT) efx->type->finish_flr(efx); /* Ensure that SRAM is initialised even if we're disabling the device */ rc = efx->type->init(efx); if (rc) { netif_err(efx, drv, efx->net_dev, "failed to initialise NIC\n"); goto fail; } if (!ok) goto fail; if (efx->port_initialized && method != RESET_TYPE_INVISIBLE && method != RESET_TYPE_DATAPATH) { rc = efx_mcdi_port_reconfigure(efx); if (rc && rc != -EPERM) netif_err(efx, drv, efx->net_dev, "could not restore PHY settings\n"); } rc = efx_enable_interrupts(efx); if (rc) goto fail; #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 if (efx->type->rx_restore_rss_contexts) efx->type->rx_restore_rss_contexts(efx); mutex_unlock(&efx->net_dev->ethtool->rss_lock); efx->type->filter_table_restore(efx); up_write(&efx->filter_sem); mutex_unlock(&efx->mac_lock); efx_start_all(efx); if (efx->type->udp_tnl_push_ports) efx->type->udp_tnl_push_ports(efx); return 0; fail: efx->port_initialized = false; mutex_unlock(&efx->net_dev->ethtool->rss_lock); up_write(&efx->filter_sem); mutex_unlock(&efx->mac_lock); return rc; } /* 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. * * Caller must hold the rtnl_lock. */ int efx_reset(struct efx_nic *efx, enum reset_type method) { int rc, rc2 = 0; bool disabled; netif_info(efx, drv, efx->net_dev, "resetting (%s)\n", RESET_TYPE(method)); efx_device_detach_sync(efx); /* efx_reset_down() grabs locks that prevent recovery on EF100. * EF100 reset is handled in the efx_nic_type callback below. */ if (efx_nic_rev(efx) != EFX_REV_EF100) efx_reset_down(efx, method); rc = efx->type->reset(efx, method); if (rc) { netif_err(efx, drv, efx->net_dev, "failed to reset hardware\n"); goto out; } /* Clear flags for the scopes we covered. We assume the NIC and * driver are now quiescent so that there is no race here. */ 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); /* 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); out: /* Leave device stopped if necessary */ disabled = rc || method == RESET_TYPE_DISABLE || method == RESET_TYPE_RECOVER_OR_DISABLE; if (efx_nic_rev(efx) != EFX_REV_EF100) rc2 = efx_reset_up(efx, method, !disabled); if (rc2) { disabled = true; if (!rc) rc = rc2; } if (disabled) { dev_close(efx->net_dev); netif_err(efx, drv, efx->net_dev, "has been disabled\n"); efx->state = STATE_DISABLED; } else { netif_dbg(efx, drv, efx->net_dev, "reset complete\n"); efx_device_attach_if_not_resetting(efx); } return rc; } /* The worker thread exists so that code that cannot sleep can * schedule a reset for later. */ static void efx_reset_work(struct work_struct *data) { struct efx_nic *efx = container_of(data, struct efx_nic, reset_work); unsigned long pending; enum reset_type method; pending = READ_ONCE(efx->reset_pending); method = fls(pending) - 1; if (method == RESET_TYPE_MC_BIST) efx_wait_for_bist_end(efx); if ((method == RESET_TYPE_RECOVER_OR_DISABLE || method == RESET_TYPE_RECOVER_OR_ALL) && efx_try_recovery(efx)) return; if (!pending) return; rtnl_lock(); /* 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_net_active(efx->state)) (void)efx_reset(efx, method); rtnl_unlock(); } void efx_schedule_reset(struct efx_nic *efx, enum reset_type type) { enum reset_type method; if (efx_recovering(efx->state)) { netif_dbg(efx, drv, efx->net_dev, "recovering: skip scheduling %s reset\n", RESET_TYPE(type)); return; } switch (type) { case RESET_TYPE_INVISIBLE: case RESET_TYPE_ALL: case RESET_TYPE_RECOVER_OR_ALL: case RESET_TYPE_WORLD: case RESET_TYPE_DISABLE: case RESET_TYPE_RECOVER_OR_DISABLE: case RESET_TYPE_DATAPATH: case RESET_TYPE_MC_BIST: case RESET_TYPE_MCDI_TIMEOUT: method = type; netif_dbg(efx, drv, efx->net_dev, "scheduling %s reset\n", RESET_TYPE(method)); break; default: method = efx->type->map_reset_reason(type); netif_dbg(efx, drv, efx->net_dev, "scheduling %s reset for %s\n", RESET_TYPE(method), RESET_TYPE(type)); break; } set_bit(method, &efx->reset_pending); 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 (!efx_net_active(READ_ONCE(efx->state))) return; /* 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); efx_queue_reset_work(efx); } /************************************************************************** * * Dummy NIC operations * * Can be used for some unimplemented operations * 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) {} /************************************************************************** * * Data housekeeping * **************************************************************************/ /* This zeroes out and then fills in the invariants in a struct * efx_nic (including all sub-structures). */ int efx_init_struct(struct efx_nic *efx, struct pci_dev *pci_dev) { int rc = -ENOMEM; /* Initialise common structures */ INIT_LIST_HEAD(&efx->node); INIT_LIST_HEAD(&efx->secondary_list); spin_lock_init(&efx->biu_lock); #ifdef CONFIG_SFC_MTD INIT_LIST_HEAD(&efx->mtd_list); #endif INIT_WORK(&efx->reset_work, efx_reset_work); INIT_DELAYED_WORK(&efx->monitor_work, efx_monitor); efx_selftest_async_init(efx); efx->pci_dev = pci_dev; efx->msg_enable = debug; efx->state = STATE_UNINIT; strscpy(efx->name, pci_name(pci_dev), sizeof(efx->name)); efx->rx_prefix_size = efx->type->rx_prefix_size; efx->rx_ip_align = NET_IP_ALIGN ? (efx->rx_prefix_size + NET_IP_ALIGN) % 4 : 0; efx->rx_packet_hash_offset = efx->type->rx_hash_offset - efx->type->rx_prefix_size; efx->rx_packet_ts_offset = efx->type->rx_ts_offset - efx->type->rx_prefix_size; efx->rss_context.priv.context_id = EFX_MCDI_RSS_CONTEXT_INVALID; efx->vport_id = EVB_PORT_ID_ASSIGNED; spin_lock_init(&efx->stats_lock); efx->vi_stride = EFX_DEFAULT_VI_STRIDE; efx->num_mac_stats = MC_CMD_MAC_NSTATS; BUILD_BUG_ON(MC_CMD_MAC_NSTATS - 1 != MC_CMD_MAC_GENERATION_END); mutex_init(&efx->mac_lock); init_rwsem(&efx->filter_sem); #ifdef CONFIG_RFS_ACCEL mutex_init(&efx->rps_mutex); spin_lock_init(&efx->rps_hash_lock); /* Failure to allocate is not fatal, but may degrade ARFS performance */ efx->rps_hash_table = kcalloc(EFX_ARFS_HASH_TABLE_SIZE, sizeof(*efx->rps_hash_table), GFP_KERNEL); #endif spin_lock_init(&efx->vf_reps_lock); INIT_LIST_HEAD(&efx->vf_reps); INIT_WORK(&efx->mac_work, efx_mac_work); init_waitqueue_head(&efx->flush_wq); efx->tx_queues_per_channel = 1; efx->rxq_entries = EFX_DEFAULT_DMAQ_SIZE; efx->txq_entries = EFX_DEFAULT_DMAQ_SIZE; efx->mem_bar = UINT_MAX; rc = efx_init_channels(efx); if (rc) goto fail; /* 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); if (!efx->workqueue) { rc = -ENOMEM; goto fail; } return 0; fail: efx_fini_struct(efx); return rc; } void efx_fini_struct(struct efx_nic *efx) { #ifdef CONFIG_RFS_ACCEL kfree(efx->rps_hash_table); #endif efx_fini_channels(efx); kfree(efx->vpd_sn); if (efx->workqueue) { destroy_workqueue(efx->workqueue); efx->workqueue = NULL; } } /* This configures the PCI device to enable I/O and DMA. */ int efx_init_io(struct efx_nic *efx, int bar, dma_addr_t dma_mask, unsigned int mem_map_size) { struct pci_dev *pci_dev = efx->pci_dev; int rc; efx->mem_bar = UINT_MAX; pci_dbg(pci_dev, "initialising I/O bar=%d\n", bar); rc = pci_enable_device(pci_dev); if (rc) { pci_err(pci_dev, "failed to enable PCI device\n"); goto fail1; } pci_set_master(pci_dev); rc = dma_set_mask_and_coherent(&pci_dev->dev, dma_mask); if (rc) { pci_err(efx->pci_dev, "could not find a suitable DMA mask\n"); goto fail2; } pci_dbg(efx->pci_dev, "using DMA mask %llx\n", (unsigned long long)dma_mask); efx->membase_phys = pci_resource_start(efx->pci_dev, bar); if (!efx->membase_phys) { pci_err(efx->pci_dev, "ERROR: No BAR%d mapping from the BIOS. Try pci=realloc on the kernel command line\n", bar); rc = -ENODEV; goto fail3; } rc = pci_request_region(pci_dev, bar, "sfc"); if (rc) { pci_err(efx->pci_dev, "request for memory BAR[%d] failed\n", bar); rc = -EIO; goto fail3; } efx->mem_bar = bar; efx->membase = ioremap(efx->membase_phys, mem_map_size); if (!efx->membase) { pci_err(efx->pci_dev, "could not map memory BAR[%d] at %llx+%x\n", bar, (unsigned long long)efx->membase_phys, mem_map_size); rc = -ENOMEM; goto fail4; } pci_dbg(efx->pci_dev, "memory BAR[%d] at %llx+%x (virtual %p)\n", bar, (unsigned long long)efx->membase_phys, mem_map_size, efx->membase); return 0; fail4: pci_release_region(efx->pci_dev, bar); fail3: efx->membase_phys = 0; fail2: pci_disable_device(efx->pci_dev); fail1: return rc; } void efx_fini_io(struct efx_nic *efx) { pci_dbg(efx->pci_dev, "shutting down I/O\n"); if (efx->membase) { iounmap(efx->membase); efx->membase = NULL; } if (efx->membase_phys) { pci_release_region(efx->pci_dev, efx->mem_bar); efx->membase_phys = 0; efx->mem_bar = UINT_MAX; } /* Don't disable bus-mastering if VFs are assigned */ if (!pci_vfs_assigned(efx->pci_dev)) pci_disable_device(efx->pci_dev); } #ifdef CONFIG_SFC_MCDI_LOGGING static ssize_t mcdi_logging_show(struct device *dev, struct device_attribute *attr, char *buf) { struct efx_nic *efx = dev_get_drvdata(dev); struct efx_mcdi_iface *mcdi = efx_mcdi(efx); return sysfs_emit(buf, "%d\n", mcdi->logging_enabled); } static ssize_t mcdi_logging_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct efx_nic *efx = dev_get_drvdata(dev); struct efx_mcdi_iface *mcdi = efx_mcdi(efx); bool enable = count > 0 && *buf != '0'; mcdi->logging_enabled = enable; return count; } static DEVICE_ATTR_RW(mcdi_logging); void efx_init_mcdi_logging(struct efx_nic *efx) { int rc = device_create_file(&efx->pci_dev->dev, &dev_attr_mcdi_logging); if (rc) { netif_warn(efx, drv, efx->net_dev, "failed to init net dev attributes\n"); } } void efx_fini_mcdi_logging(struct efx_nic *efx) { device_remove_file(&efx->pci_dev->dev, &dev_attr_mcdi_logging); } #endif /* 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, pci_channel_state_t 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 = efx_recover(efx->state); efx->reset_pending = 0; efx_device_detach_sync(efx); if (efx_net_active(efx->state)) { 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 = efx_recovered(efx->state); 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. */ const struct pci_error_handlers efx_err_handlers = { .error_detected = efx_io_error_detected, .slot_reset = efx_io_slot_reset, .resume = efx_io_resume, }; /* Determine whether the NIC will be able to handle TX offloads for a given * encapsulated packet. */ static bool efx_can_encap_offloads(struct efx_nic *efx, struct sk_buff *skb) { struct gre_base_hdr *greh; __be16 dst_port; u8 ipproto; /* Does the NIC support encap offloads? * If not, we should never get here, because we shouldn't have * advertised encap offload feature flags in the first place. */ if (WARN_ON_ONCE(!efx->type->udp_tnl_has_port)) return false; /* Determine encapsulation protocol in use */ switch (skb->protocol) { case htons(ETH_P_IP): ipproto = ip_hdr(skb)->protocol; break; case htons(ETH_P_IPV6): /* If there are extension headers, this will cause us to * think we can't offload something that we maybe could have. */ ipproto = ipv6_hdr(skb)->nexthdr; break; default: /* Not IP, so can't offload it */ return false; } switch (ipproto) { case IPPROTO_GRE: /* We support NVGRE but not IP over GRE or random gretaps. * Specifically, the NIC will accept GRE as encapsulated if * the inner protocol is Ethernet, but only handle it * correctly if the GRE header is 8 bytes long. Moreover, * it will not update the Checksum or Sequence Number fields * if they are present. (The Routing Present flag, * GRE_ROUTING, cannot be set else the header would be more * than 8 bytes long; so we don't have to worry about it.) */ if (skb->inner_protocol_type != ENCAP_TYPE_ETHER) return false; if (ntohs(skb->inner_protocol) != ETH_P_TEB) return false; if (skb_inner_mac_header(skb) - skb_transport_header(skb) != 8) return false; greh = (struct gre_base_hdr *)skb_transport_header(skb); return !(greh->flags & (GRE_CSUM | GRE_SEQ)); case IPPROTO_UDP: /* If the port is registered for a UDP tunnel, we assume the * packet is for that tunnel, and the NIC will handle it as * such. If not, the NIC won't know what to do with it. */ dst_port = udp_hdr(skb)->dest; return efx->type->udp_tnl_has_port(efx, dst_port); default: return false; } } netdev_features_t efx_features_check(struct sk_buff *skb, struct net_device *dev, netdev_features_t features) { struct efx_nic *efx = efx_netdev_priv(dev); if (skb->encapsulation) { if (features & NETIF_F_GSO_MASK) /* Hardware can only do TSO with at most 208 bytes * of headers. */ if (skb_inner_transport_offset(skb) > EFX_TSO2_MAX_HDRLEN) features &= ~(NETIF_F_GSO_MASK); if (features & (NETIF_F_GSO_MASK | NETIF_F_CSUM_MASK)) if (!efx_can_encap_offloads(efx, skb)) features &= ~(NETIF_F_GSO_MASK | NETIF_F_CSUM_MASK); } return features; } int efx_get_phys_port_id(struct net_device *net_dev, struct netdev_phys_item_id *ppid) { struct efx_nic *efx = efx_netdev_priv(net_dev); if (efx->type->get_phys_port_id) return efx->type->get_phys_port_id(efx, ppid); else return -EOPNOTSUPP; } int efx_get_phys_port_name(struct net_device *net_dev, char *name, size_t len) { struct efx_nic *efx = efx_netdev_priv(net_dev); if (snprintf(name, len, "p%u", efx->port_num) >= len) return -EINVAL; return 0; } void efx_detach_reps(struct efx_nic *efx) { struct net_device *rep_dev; struct efx_rep *efv; ASSERT_RTNL(); netif_dbg(efx, drv, efx->net_dev, "Detaching VF representors\n"); list_for_each_entry(efv, &efx->vf_reps, list) { rep_dev = efv->net_dev; if (!rep_dev) continue; netif_carrier_off(rep_dev); /* See efx_device_detach_sync() */ netif_tx_lock_bh(rep_dev); netif_tx_stop_all_queues(rep_dev); netif_tx_unlock_bh(rep_dev); } } void efx_attach_reps(struct efx_nic *efx) { struct net_device *rep_dev; struct efx_rep *efv; ASSERT_RTNL(); netif_dbg(efx, drv, efx->net_dev, "Attaching VF representors\n"); list_for_each_entry(efv, &efx->vf_reps, list) { rep_dev = efv->net_dev; if (!rep_dev) continue; netif_tx_wake_all_queues(rep_dev); netif_carrier_on(rep_dev); } }