diff options
Diffstat (limited to 'drivers/net/sfc/efx.c')
| -rw-r--r-- | drivers/net/sfc/efx.c | 2312 |
1 files changed, 0 insertions, 2312 deletions
diff --git a/drivers/net/sfc/efx.c b/drivers/net/sfc/efx.c deleted file mode 100644 index 343e8da1fa3..00000000000 --- a/drivers/net/sfc/efx.c +++ /dev/null @@ -1,2312 +0,0 @@ -/**************************************************************************** - * Driver for Solarflare Solarstorm network controllers and boards - * Copyright 2005-2006 Fen Systems Ltd. - * Copyright 2005-2008 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 <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/crc32.h> -#include <linux/ethtool.h> -#include <linux/topology.h> -#include "net_driver.h" -#include "ethtool.h" -#include "tx.h" -#include "rx.h" -#include "efx.h" -#include "mdio_10g.h" -#include "falcon.h" - -#define EFX_MAX_MTU (9 * 1024) - -/* RX slow fill workqueue. If memory allocation fails in the fast path, - * a work item is pushed onto this work queue to retry the allocation later, - * to avoid the NIC being starved of RX buffers. Since this is a per cpu - * workqueue, there is nothing to be gained in making it per NIC - */ -static struct workqueue_struct *refill_workqueue; - -/* 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; - -/************************************************************************** - * - * 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 - */ -static unsigned int separate_tx_channels; -module_param(separate_tx_channels, uint, 0644); -MODULE_PARM_DESC(separate_tx_channels, - "Use separate channels for TX and RX"); - -/* 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 - * monitor, which checks for known hardware bugs and resets the - * hardware and driver as necessary. - */ -unsigned int efx_monitor_interval = 1 * HZ; - -/* This controls whether or not the driver will initialise devices - * with invalid MAC addresses stored in the EEPROM or flash. If true, - * such devices will be initialised with a random locally-generated - * MAC address. This allows for loading the sfc_mtd driver to - * reprogram the flash, even if the flash contents (including the MAC - * address) have previously been erased. - */ -static unsigned int allow_bad_hwaddr; - -/* 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. - * The default (0) means to assign an interrupt to each package (level II cache) - */ -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"); - -static int phy_flash_cfg; -module_param(phy_flash_cfg, int, 0644); -MODULE_PARM_DESC(phy_flash_cfg, "Set PHYs into reflash mode initially"); - -static unsigned irq_adapt_low_thresh = 10000; -module_param(irq_adapt_low_thresh, uint, 0644); -MODULE_PARM_DESC(irq_adapt_low_thresh, - "Threshold score for reducing IRQ moderation"); - -static unsigned irq_adapt_high_thresh = 20000; -module_param(irq_adapt_high_thresh, uint, 0644); -MODULE_PARM_DESC(irq_adapt_high_thresh, - "Threshold score for increasing IRQ moderation"); - -/************************************************************************** - * - * Utility functions and prototypes - * - *************************************************************************/ -static void efx_remove_channel(struct efx_channel *channel); -static void efx_remove_port(struct efx_nic *efx); -static void efx_fini_napi(struct efx_nic *efx); -static void efx_fini_channels(struct efx_nic *efx); - -#define EFX_ASSERT_RESET_SERIALISED(efx) \ - do { \ - if (efx->state == STATE_RUNNING) \ - ASSERT_RTNL(); \ - } while (0) - -/************************************************************************** - * - * 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. - */ -static int efx_process_channel(struct efx_channel *channel, int rx_quota) -{ - struct efx_nic *efx = channel->efx; - int rx_packets; - - if (unlikely(efx->reset_pending != RESET_TYPE_NONE || - !channel->enabled)) - return 0; - - rx_packets = falcon_process_eventq(channel, rx_quota); - if (rx_packets == 0) - return 0; - - /* Deliver last RX packet. */ - if (channel->rx_pkt) { - __efx_rx_packet(channel, channel->rx_pkt, - channel->rx_pkt_csummed); - channel->rx_pkt = NULL; - } - - efx_rx_strategy(channel); - - efx_fast_push_rx_descriptors(&efx->rx_queue[channel->channel]); - - return rx_packets; -} - -/* Mark channel as finished processing - * - * Note that since we will not receive further interrupts for this - * channel before we finish processing and call the eventq_read_ack() - * method, there is no need to use the interrupt hold-off timers. - */ -static inline void efx_channel_processed(struct efx_channel *channel) -{ - /* The interrupt handler for this channel may set work_pending - * as soon as we acknowledge the events we've seen. Make sure - * it's cleared before then. */ - channel->work_pending = false; - smp_wmb(); - - falcon_eventq_read_ack(channel); -} - -/* 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); - int rx_packets; - - EFX_TRACE(channel->efx, "channel %d NAPI poll executing on CPU %d\n", - channel->channel, raw_smp_processor_id()); - - rx_packets = efx_process_channel(channel, budget); - - if (rx_packets < budget) { - struct efx_nic *efx = channel->efx; - - if (channel->used_flags & EFX_USED_BY_RX && - efx->irq_rx_adaptive && - unlikely(++channel->irq_count == 1000)) { - unsigned old_irq_moderation = channel->irq_moderation; - - if (unlikely(channel->irq_mod_score < - irq_adapt_low_thresh)) { - channel->irq_moderation = - max_t(int, - channel->irq_moderation - - FALCON_IRQ_MOD_RESOLUTION, - FALCON_IRQ_MOD_RESOLUTION); - } else if (unlikely(channel->irq_mod_score > - irq_adapt_high_thresh)) { - channel->irq_moderation = - min(channel->irq_moderation + - FALCON_IRQ_MOD_RESOLUTION, - efx->irq_rx_moderation); - } - - if (channel->irq_moderation != old_irq_moderation) - falcon_set_int_moderation(channel); - - channel->irq_count = 0; - channel->irq_mod_score = 0; - } - - /* There is no race here; although napi_disable() will - * only wait for napi_complete(), this isn't a problem - * since efx_channel_processed() will have no effect if - * interrupts have already been disabled. - */ - napi_complete(napi); - efx_channel_processed(channel); - } - - return rx_packets; -} - -/* Process the eventq of the specified channel immediately on this CPU - * - * Disable hardware generated interrupts, wait for any existing - * processing to finish, then directly poll (and ack ) the eventq. - * Finally reenable NAPI and interrupts. - * - * Since we are touching interrupts the caller should hold the suspend lock - */ -void efx_process_channel_now(struct efx_channel *channel) -{ - struct efx_nic *efx = channel->efx; - - BUG_ON(!channel->used_flags); - BUG_ON(!channel->enabled); - - /* Disable interrupts and wait for ISRs to complete */ - falcon_disable_interrupts(efx); - if (efx->legacy_irq) - synchronize_irq(efx->legacy_irq); - if (channel->irq) - synchronize_irq(channel->irq); - - /* Wait for any NAPI processing to complete */ - napi_disable(&channel->napi_str); - - /* Poll the channel */ - efx_process_channel(channel, efx->type->evq_size); - - /* Ack the eventq. This may cause an interrupt to be generated - * when they are reenabled */ - efx_channel_processed(channel); - - napi_enable(&channel->napi_str); - falcon_enable_interrupts(efx); -} - -/* 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) -{ - EFX_LOG(channel->efx, "chan %d create event queue\n", channel->channel); - - return falcon_probe_eventq(channel); -} - -/* Prepare channel's event queue */ -static void efx_init_eventq(struct efx_channel *channel) -{ - EFX_LOG(channel->efx, "chan %d init event queue\n", channel->channel); - - channel->eventq_read_ptr = 0; - - falcon_init_eventq(channel); -} - -static void efx_fini_eventq(struct efx_channel *channel) -{ - EFX_LOG(channel->efx, "chan %d fini event queue\n", channel->channel); - - falcon_fini_eventq(channel); -} - -static void efx_remove_eventq(struct efx_channel *channel) -{ - EFX_LOG(channel->efx, "chan %d remove event queue\n", channel->channel); - - falcon_remove_eventq(channel); -} - -/************************************************************************** - * - * Channel handling - * - *************************************************************************/ - -static int efx_probe_channel(struct efx_channel *channel) -{ - struct efx_tx_queue *tx_queue; - struct efx_rx_queue *rx_queue; - int rc; - - EFX_LOG(channel->efx, "creating channel %d\n", channel->channel); - - rc = efx_probe_eventq(channel); - if (rc) - goto fail1; - - efx_for_each_channel_tx_queue(tx_queue, channel) { - rc = efx_probe_tx_queue(tx_queue); - if (rc) - goto fail2; - } - - efx_for_each_channel_rx_queue(rx_queue, channel) { - rc = efx_probe_rx_queue(rx_queue); - if (rc) - goto fail3; - } - - channel->n_rx_frm_trunc = 0; - - return 0; - - fail3: - efx_for_each_channel_rx_queue(rx_queue, channel) - efx_remove_rx_queue(rx_queue); - fail2: - efx_for_each_channel_tx_queue(tx_queue, channel) - efx_remove_tx_queue(tx_queue); - fail1: - return rc; -} - - -static void efx_set_channel_names(struct efx_nic *efx) -{ - struct efx_channel *channel; - const char *type = ""; - int number; - - efx_for_each_channel(channel, efx) { - number = channel->channel; - if (efx->n_channels > efx->n_rx_queues) { - if (channel->channel < efx->n_rx_queues) { - type = "-rx"; - } else { - type = "-tx"; - number -= efx->n_rx_queues; - } - } - snprintf(channel->name, sizeof(channel->name), - "%s%s-%d", efx->name, type, number); - } -} - -/* 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_init_channels(struct efx_nic *efx) -{ - struct efx_tx_queue *tx_queue; - struct efx_rx_queue *rx_queue; - struct efx_channel *channel; - - /* Calculate the rx buffer allocation parameters required to - * support the current MTU, including padding for header - * alignment and overruns. - */ - efx->rx_buffer_len = (max(EFX_PAGE_IP_ALIGN, NET_IP_ALIGN) + - EFX_MAX_FRAME_LEN(efx->net_dev->mtu) + - efx->type->rx_buffer_padding); - efx->rx_buffer_order = get_order(efx->rx_buffer_len); - - /* Initialise the channels */ - efx_for_each_channel(channel, efx) { - EFX_LOG(channel->efx, "init chan %d\n", channel->channel); - - efx_init_eventq(channel); - - efx_for_each_channel_tx_queue(tx_queue, channel) - efx_init_tx_queue(tx_queue); - - /* The rx buffer allocation strategy is MTU dependent */ - efx_rx_strategy(channel); - - efx_for_each_channel_rx_queue(rx_queue, channel) - efx_init_rx_queue(rx_queue); - - WARN_ON(channel->rx_pkt != NULL); - efx_rx_strategy(channel); - } -} - -/* This enables event queue processing and packet transmission. - * - * Note that this function is not allowed to fail, since that would - * introduce too much complexity into the suspend/resume path. - */ -static void efx_start_channel(struct efx_channel *channel) -{ - struct efx_rx_queue *rx_queue; - - EFX_LOG(channel->efx, "starting chan %d\n", channel->channel); - - /* The interrupt handler for this channel may set work_pending - * as soon as we enable it. Make sure it's cleared before - * then. Similarly, make sure it sees the enabled flag set. */ - channel->work_pending = false; - channel->enabled = true; - smp_wmb(); - - napi_enable(&channel->napi_str); - - /* Load up RX descriptors */ - efx_for_each_channel_rx_queue(rx_queue, channel) - efx_fast_push_rx_descriptors(rx_queue); -} - -/* This disables event queue processing and packet transmission. - * This function does not guarantee that all queue processing - * (e.g. RX refill) is complete. - */ -static void efx_stop_channel(struct efx_channel *channel) -{ - struct efx_rx_queue *rx_queue; - - if (!channel->enabled) - return; - - EFX_LOG(channel->efx, "stop chan %d\n", channel->channel); - - channel->enabled = false; - napi_disable(&channel->napi_str); - - /* Ensure that any worker threads have exited or will be no-ops */ - efx_for_each_channel_rx_queue(rx_queue, channel) { - spin_lock_bh(&rx_queue->add_lock); - spin_unlock_bh(&rx_queue->add_lock); - } -} - -static void efx_fini_channels(struct efx_nic *efx) -{ - struct efx_channel *channel; - struct efx_tx_queue *tx_queue; - struct efx_rx_queue *rx_queue; - int rc; - - EFX_ASSERT_RESET_SERIALISED(efx); - BUG_ON(efx->port_enabled); - - rc = falcon_flush_queues(efx); - if (rc) - EFX_ERR(efx, "failed to flush queues\n"); - else - EFX_LOG(efx, "successfully flushed all queues\n"); - - efx_for_each_channel(channel, efx) { - EFX_LOG(channel->efx, "shut down chan %d\n", channel->channel); - - efx_for_each_channel_rx_queue(rx_queue, channel) - efx_fini_rx_queue(rx_queue); - efx_for_each_channel_tx_queue(tx_queue, channel) - efx_fini_tx_queue(tx_queue); - efx_fini_eventq(channel); - } -} - -static void efx_remove_channel(struct efx_channel *channel) -{ - struct efx_tx_queue *tx_queue; - struct efx_rx_queue *rx_queue; - - EFX_LOG(channel->efx, "destroy chan %d\n", channel->channel); - - efx_for_each_channel_rx_queue(rx_queue, channel) - efx_remove_rx_queue(rx_queue); - efx_for_each_channel_tx_queue(tx_queue, channel) - efx_remove_tx_queue(tx_queue); - efx_remove_eventq(channel); - - channel->used_flags = 0; -} - -void efx_schedule_slow_fill(struct efx_rx_queue *rx_queue, int delay) -{ - queue_delayed_work(refill_workqueue, &rx_queue->work, delay); -} - -/************************************************************************** - * - * 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. - */ -static void efx_link_status_changed(struct efx_nic *efx) -{ - /* 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 (efx->port_inhibited) { - netif_carrier_off(efx->net_dev); - return; - } - - if (efx->link_up != netif_carrier_ok(efx->net_dev)) { - efx->n_link_state_changes++; - - if (efx->link_up) - netif_carrier_on(efx->net_dev); - else - netif_carrier_off(efx->net_dev); - } - - /* Status message for kernel log */ - if (efx->link_up) { - EFX_INFO(efx, "link up at %uMbps %s-duplex (MTU %d)%s\n", - efx->link_speed, efx->link_fd ? "full" : "half", - efx->net_dev->mtu, - (efx->promiscuous ? " [PROMISC]" : "")); - } else { - EFX_INFO(efx, "link down\n"); - } - -} - -static void efx_fini_port(struct efx_nic *efx); - -/* This call reinitialises the MAC to pick up new PHY settings. The - * caller must hold the mac_lock */ -void __efx_reconfigure_port(struct efx_nic *efx) -{ - WARN_ON(!mutex_is_locked(&efx->mac_lock)); - - EFX_LOG(efx, "reconfiguring MAC from PHY settings on CPU %d\n", - raw_smp_processor_id()); - - /* Serialise the promiscuous flag with efx_set_multicast_list. */ - if (efx_dev_registered(efx)) { - netif_addr_lock_bh(efx->net_dev); - netif_addr_unlock_bh(efx->net_dev); - } - - falcon_deconfigure_mac_wrapper(efx); - - /* Reconfigure the PHY, disabling transmit in mac level loopback. */ - if (LOOPBACK_INTERNAL(efx)) - efx->phy_mode |= PHY_MODE_TX_DISABLED; - else - efx->phy_mode &= ~PHY_MODE_TX_DISABLED; - efx->phy_op->reconfigure(efx); - - if (falcon_switch_mac(efx)) - goto fail; - - efx->mac_op->reconfigure(efx); - - /* Inform kernel of loss/gain of carrier */ - efx_link_status_changed(efx); - return; - -fail: - EFX_ERR(efx, "failed to reconfigure MAC\n"); - efx->port_enabled = false; - efx_fini_port(efx); -} - -/* Reinitialise the MAC to pick up new PHY settings, even if the port is - * disabled. */ -void efx_reconfigure_port(struct efx_nic *efx) -{ - EFX_ASSERT_RESET_SERIALISED(efx); - - mutex_lock(&efx->mac_lock); - __efx_reconfigure_port(efx); - mutex_unlock(&efx->mac_lock); -} - -/* Asynchronous efx_reconfigure_port work item. To speed up efx_flush_all() - * we don't efx_reconfigure_port() if the port is disabled. Care is taken - * in efx_stop_all() and efx_start_port() to prevent PHY events being lost */ -static void efx_phy_work(struct work_struct *data) -{ - struct efx_nic *efx = container_of(data, struct efx_nic, phy_work); - - mutex_lock(&efx->mac_lock); - if (efx->port_enabled) - __efx_reconfigure_port(efx); - mutex_unlock(&efx->mac_lock); -} - -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_op->irq(efx); - mutex_unlock(&efx->mac_lock); -} - -static int efx_probe_port(struct efx_nic *efx) -{ - int rc; - - EFX_LOG(efx, "create port\n"); - - /* Connect up MAC/PHY operations table and read MAC address */ - rc = falcon_probe_port(efx); - if (rc) - goto err; - - if (phy_flash_cfg) - efx->phy_mode = PHY_MODE_SPECIAL; - - /* Sanity check MAC address */ - if (is_valid_ether_addr(efx->mac_address)) { - memcpy(efx->net_dev->dev_addr, efx->mac_address, ETH_ALEN); - } else { - EFX_ERR(efx, "invalid MAC address %pM\n", - efx->mac_address); - if (!allow_bad_hwaddr) { - rc = -EINVAL; - goto err; - } - random_ether_addr(efx->net_dev->dev_addr); - EFX_INFO(efx, "using locally-generated MAC %pM\n", - efx->net_dev->dev_addr); - } - - return 0; - - err: - efx_remove_port(efx); - return rc; -} - -static int efx_init_port(struct efx_nic *efx) -{ - int rc; - - EFX_LOG(efx, "init port\n"); - - rc = efx->phy_op->init(efx); - if (rc) - return rc; - mutex_lock(&efx->mac_lock); - efx->phy_op->reconfigure(efx); - rc = falcon_switch_mac(efx); - mutex_unlock(&efx->mac_lock); - if (rc) - goto fail; - efx->mac_op->reconfigure(efx); - - efx->port_initialized = true; - efx_stats_enable(efx); - return 0; - -fail: - efx->phy_op->fini(efx); - return rc; -} - -/* Allow efx_reconfigure_port() to be scheduled, and close the window - * between efx_stop_port and efx_flush_all whereby a previously scheduled - * efx_phy_work()/efx_mac_work() may have been cancelled */ -static void efx_start_port(struct efx_nic *efx) -{ - EFX_LOG(efx, "start port\n"); - BUG_ON(efx->port_enabled); - - mutex_lock(&efx->mac_lock); - efx->port_enabled = true; - __efx_reconfigure_port(efx); - efx->mac_op->irq(efx); - mutex_unlock(&efx->mac_lock); -} - -/* Prevent efx_phy_work, efx_mac_work, and efx_monitor() from executing, - * and efx_set_multicast_list() from scheduling efx_phy_work. efx_phy_work - * and efx_mac_work may still be scheduled via NAPI processing until - * efx_flush_all() is called */ -static void efx_stop_port(struct efx_nic *efx) -{ - EFX_LOG(efx, "stop port\n"); - - mutex_lock(&efx->mac_lock); - efx->port_enabled = false; - mutex_unlock(&efx->mac_lock); - - /* Serialise against efx_set_multicast_list() */ - if (efx_dev_registered(efx)) { - netif_addr_lock_bh(efx->net_dev); - netif_addr_unlock_bh(efx->net_dev); - } -} - -static void efx_fini_port(struct efx_nic *efx) -{ - EFX_LOG(efx, "shut down port\n"); - - if (!efx->port_initialized) - return; - - efx_stats_disable(efx); - efx->phy_op->fini(efx); - efx->port_initialized = false; - - efx->link_up = false; - efx_link_status_changed(efx); -} - -static void efx_remove_port(struct efx_nic *efx) -{ - EFX_LOG(efx, "destroying port\n"); - - falcon_remove_port(efx); -} - -/************************************************************************** - * - * NIC handling - * - **************************************************************************/ - -/* 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; - int rc; - - EFX_LOG(efx, "initialising I/O\n"); - - rc = pci_enable_device(pci_dev); - if (rc) { - EFX_ERR(efx, "failed to enable PCI device\n"); - 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) { - if (pci_dma_supported(pci_dev, dma_mask) && - ((rc = pci_set_dma_mask(pci_dev, dma_mask)) == 0)) - break; - dma_mask >>= 1; - } - if (rc) { - EFX_ERR(efx, "could not find a suitable DMA mask\n"); - goto fail2; - } - EFX_LOG(efx, "using DMA mask %llx\n", (unsigned long long) dma_mask); - rc = pci_set_consistent_dma_mask(pci_dev, dma_mask); - if (rc) { - /* pci_set_consistent_dma_mask() is not *allowed* to - * fail with a mask that pci_set_dma_mask() accepted, - * but just in case... - */ - EFX_ERR(efx, "failed to set consistent DMA mask\n"); - goto fail2; - } - - efx->membase_phys = pci_resource_start(efx->pci_dev, - efx->type->mem_bar); - rc = pci_request_region(pci_dev, efx->type->mem_bar, "sfc"); - if (rc) { - EFX_ERR(efx, "request for memory BAR failed\n"); - rc = -EIO; - goto fail3; - } - efx->membase = ioremap_nocache(efx->membase_phys, - efx->type->mem_map_size); - if (!efx->membase) { - EFX_ERR(efx, "could not map memory BAR %d at %llx+%x\n", - efx->type->mem_bar, - (unsigned long long)efx->membase_phys, - efx->type->mem_map_size); - rc = -ENOMEM; - goto fail4; - } - EFX_LOG(efx, "memory BAR %u at %llx+%x (virtual %p)\n", - efx->type->mem_bar, (unsigned long long)efx->membase_phys, - efx->type->mem_map_size, efx->membase); - - return 0; - - fail4: - pci_release_region(efx->pci_dev, efx->type->mem_bar); - fail3: - efx->membase_phys = 0; - fail2: - pci_disable_device(efx->pci_dev); - fail1: - return rc; -} - -static void efx_fini_io(struct efx_nic *efx) -{ - EFX_LOG(efx, "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->type->mem_bar); - efx->membase_phys = 0; - } - - pci_disable_device(efx->pci_dev); -} - -/* Get number of RX queues wanted. Return number of online CPU - * packages in the expectation that an IRQ balancer will spread - * interrupts across them. */ -static int efx_wanted_rx_queues(void) -{ - cpumask_var_t core_mask; - int count; - int cpu; - - if (unlikely(!alloc_cpumask_var(&core_mask, GFP_KERNEL))) { - printk(KERN_WARNING - "sfc: RSS disabled due to allocation failure\n"); - return 1; - } - - cpumask_clear(core_mask); - count = 0; - for_each_online_cpu(cpu) { - if (!cpumask_test_cpu(cpu, core_mask)) { - ++count; - cpumask_or(core_mask, core_mask, - topology_core_cpumask(cpu)); - } - } - - free_cpumask_var(core_mask); - return count; -} - -/* Probe the number and type of interrupts we are able to obtain, and - * the resulting numbers of channels and RX queues. - */ -static void efx_probe_interrupts(struct efx_nic *efx) -{ - int max_channels = - min_t(int, efx->type->phys_addr_channels, EFX_MAX_CHANNELS); - int rc, i; - - if (efx->interrupt_mode == EFX_INT_MODE_MSIX) { - struct msix_entry xentries[EFX_MAX_CHANNELS]; - int wanted_ints; - int rx_queues; - - /* We want one RX queue and interrupt per CPU package - * (or as specified by the rss_cpus module parameter). - * We will need one channel per interrupt. - */ - rx_queues = rss_cpus ? rss_cpus : efx_wanted_rx_queues(); - wanted_ints = rx_queues + (separate_tx_channels ? 1 : 0); - wanted_ints = min(wanted_ints, max_channels); - - for (i = 0; i < wanted_ints; i++) - xentries[i].entry = i; - rc = pci_enable_msix(efx->pci_dev, xentries, wanted_ints); - if (rc > 0) { - EFX_ERR(efx, "WARNING: Insufficient MSI-X vectors" - " available (%d < %d).\n", rc, wanted_ints); - EFX_ERR(efx, "WARNING: Performance may be reduced.\n"); - EFX_BUG_ON_PARANOID(rc >= wanted_ints); - wanted_ints = rc; - rc = pci_enable_msix(efx->pci_dev, xentries, - wanted_ints); - } - - if (rc == 0) { - efx->n_rx_queues = min(rx_queues, wanted_ints); - efx->n_channels = wanted_ints; - for (i = 0; i < wanted_ints; i++) - efx->channel[i].irq = xentries[i].vector; - } else { - /* Fall back to single channel MSI */ - efx->interrupt_mode = EFX_INT_MODE_MSI; - EFX_ERR(efx, "could not enable MSI-X\n"); - } - } - - /* Try single interrupt MSI */ - if (efx->interrupt_mode == EFX_INT_MODE_MSI) { - efx->n_rx_queues = 1; - efx->n_channels = 1; - rc = pci_enable_msi(efx->pci_dev); - if (rc == 0) { - efx->channel[0].irq = efx->pci_dev->irq; - } else { - EFX_ERR(efx, "could not enable MSI\n"); - efx->interrupt_mode = EFX_INT_MODE_LEGACY; - } - } - - /* Assume legacy interrupts */ - if (efx->interrupt_mode == EFX_INT_MODE_LEGACY) { - efx->n_rx_queues = 1; - efx->n_channels = 1 + (separate_tx_channels ? 1 : 0); - efx->legacy_irq = efx->pci_dev->irq; - } -} - -static void efx_remove_interrupts(struct efx_nic *efx) -{ - struct efx_channel *channel; - - /* Remove MSI/MSI-X interrupts */ - efx_for_each_channel(channel, efx) - channel->irq = 0; - pci_disable_msi(efx->pci_dev); - pci_disable_msix(efx->pci_dev); - - /* Remove legacy interrupt */ - efx->legacy_irq = 0; -} - -static void efx_set_channels(struct efx_nic *efx) -{ - struct efx_tx_queue *tx_queue; - struct efx_rx_queue *rx_queue; - - efx_for_each_tx_queue(tx_queue, efx) { - if (separate_tx_channels) - tx_queue->channel = &efx->channel[efx->n_channels-1]; - else - tx_queue->channel = &efx->channel[0]; - tx_queue->channel->used_flags |= EFX_USED_BY_TX; - } - - efx_for_each_rx_queue(rx_queue, efx) { - rx_queue->channel = &efx->channel[rx_queue->queue]; - rx_queue->channel->used_flags |= EFX_USED_BY_RX; - } -} - -static int efx_probe_nic(struct efx_nic *efx) -{ - int rc; - - EFX_LOG(efx, "creating NIC\n"); - - /* Carry out hardware-type specific initialisation */ - rc = falcon_probe_nic(efx); - if (rc) - return rc; - - /* Determine the number of channels and RX queues by trying to hook - * in MSI-X interrupts. */ - efx_probe_interrupts(efx); - - efx_set_channels(efx); - - /* Initialise the interrupt moderation settings */ - efx_init_irq_moderation(efx, tx_irq_mod_usec, rx_irq_mod_usec, true); - - return 0; -} - -static void efx_remove_nic(struct efx_nic *efx) -{ - EFX_LOG(efx, "destroying NIC\n"); - - efx_remove_interrupts(efx); - falcon_remove_nic(efx); -} - -/************************************************************************** - * - * NIC startup/shutdown - * - *************************************************************************/ - -static int efx_probe_all(struct efx_nic *efx) -{ - struct efx_channel *channel; - int rc; - - /* Create NIC */ - rc = efx_probe_nic(efx); - if (rc) { - EFX_ERR(efx, "failed to create NIC\n"); - goto fail1; - } - - /* Create port */ - rc = efx_probe_port(efx); - if (rc) { - EFX_ERR(efx, "failed to create port\n"); - goto fail2; - } - - /* Create channels */ - efx_for_each_channel(channel, efx) { - rc = efx_probe_channel(channel); - if (rc) { - EFX_ERR(efx, "failed to create channel %d\n", - channel->channel); - goto fail3; - } - } - efx_set_channel_names(efx); - - return 0; - - fail3: - efx_for_each_channel(channel, efx) - efx_remove_channel(channel); - efx_remove_port(efx); - fail2: - efx_remove_nic(efx); - fail1: - return rc; -} - -/* Called after previous invocation(s) of efx_stop_all, restarts the - * port, kernel transmit queue, NAPI processing and hardware interrupts, - * and ensures that the port is scheduled to be reconfigured. - * This function is safe to call multiple times when the NIC is in any - * state. */ -static void efx_start_all(struct efx_nic *efx) -{ - struct efx_channel *channel; - - EFX_ASSERT_RESET_SERIALISED(efx); - - /* 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) - return; - if ((efx->state != STATE_RUNNING) && (efx->state != STATE_INIT)) - return; - if (efx_dev_registered(efx) && !netif_running(efx->net_dev)) - return; - - /* Mark the port as enabled so port reconfigurations can start, then - * restart the transmit interface early so the watchdog timer stops */ - efx_start_port(efx); - if (efx_dev_registered(efx)) - efx_wake_queue(efx); - - efx_for_each_channel(channel, efx) - efx_start_channel(channel); - - falcon_enable_interrupts(efx); - - /* Start hardware monitor if we're in RUNNING */ - if (efx->state == STATE_RUNNING) - queue_delayed_work(efx->workqueue, &efx->monitor_work, - efx_monitor_interval); -} - -/* Flush all delayed work. Should only be called when no more delayed work - * will be scheduled. This doesn't flush pending online resets (efx_reset), - * since we're holding the rtnl_lock at this point. */ -static void efx_flush_all(struct efx_nic *efx) -{ - struct efx_rx_queue *rx_queue; - - /* Make sure the hardware monitor is stopped */ - cancel_delayed_work_sync(&efx->monitor_work); - - /* Ensure that all RX slow refills are complete. */ - efx_for_each_rx_queue(rx_queue, efx) - cancel_delayed_work_sync(&rx_queue->work); - - /* Stop scheduled port reconfigurations */ - cancel_work_sync(&efx->mac_work); - cancel_work_sync(&efx->phy_work); - -} - -/* Quiesce hardware and software without bringing the link down. - * Safe to call multiple times, when the nic and interface is in any - * state. The caller is guaranteed to subsequently be in a position - * to modify any hardware and software state they see fit without - * taking locks. */ -static void efx_stop_all(struct efx_nic *efx) -{ - struct efx_channel *channel; - - EFX_ASSERT_RESET_SERIALISED(efx); - - /* port_enabled can be read safely under the rtnl lock */ - if (!efx->port_enabled) - return; - - /* Disable interrupts and wait for ISR to complete */ - falcon_disable_interrupts(efx); - if (efx->legacy_irq) - synchronize_irq(efx->legacy_irq); - efx_for_each_channel(channel, efx) { - if (channel->irq) - synchronize_irq(channel->irq); - } - - /* Stop all NAPI processing and synchronous rx refills */ - efx_for_each_channel(channel, efx) - efx_stop_channel(channel); - - /* Stop all asynchronous port reconfigurations. Since all - * event processing has already been stopped, there is no - * window to loose phy events */ - efx_stop_port(efx); - - /* Flush efx_phy_work, efx_mac_work, refill_workqueue, monitor_work */ - efx_flush_all(efx); - - /* Isolate the MAC from the TX and RX engines, so that queue - * flushes will complete in a timely fashion. */ - falcon_drain_tx_fifo(efx); - - /* Stop the kernel transmit interface late, so the watchdog - * timer isn't ticking over the flush */ - if (efx_dev_registered(efx)) { - efx_stop_queue(efx); - netif_tx_lock_bh(efx->net_dev); - netif_tx_unlock_bh(efx->net_dev); - } -} - -static void efx_remove_all(struct efx_nic *efx) -{ - struct efx_channel *channel; - - efx_for_each_channel(channel, efx) - efx_remove_channel(channel); - efx_remove_port(efx); - efx_remove_nic(efx); -} - -/* A convinience function to safely flush all the queues */ -void efx_flush_queues(struct efx_nic *efx) -{ - EFX_ASSERT_RESET_SERIALISED(efx); - - efx_stop_all(efx); - - efx_fini_channels(efx); - efx_init_channels(efx); - - efx_start_all(efx); -} - -/************************************************************************** - * - * Interrupt moderation - * - **************************************************************************/ - -/* Set interrupt moderation parameters */ -void efx_init_irq_moderation(struct efx_nic *efx, int tx_usecs, int rx_usecs, - bool rx_adaptive) -{ - struct efx_tx_queue *tx_queue; - struct efx_rx_queue *rx_queue; - - EFX_ASSERT_RESET_SERIALISED(efx); - - efx_for_each_tx_queue(tx_queue, efx) - tx_queue->channel->irq_moderation = tx_usecs; - - efx->irq_rx_adaptive = rx_adaptive; - efx->irq_rx_moderation = rx_usecs; - efx_for_each_rx_queue(rx_queue, efx) - rx_queue->channel->irq_moderation = rx_usecs; -} - -/************************************************************************** - * - * Hardware monitor - * - **************************************************************************/ - -/* Run periodically off the general workqueue. Serialised against - * efx_reconfigure_port via the mac_lock */ -static void efx_monitor(struct work_struct *data) -{ - struct efx_nic *efx = container_of(data, struct efx_nic, - monitor_work.work); - int rc; - - EFX_TRACE(efx, "hardware monitor executing on CPU %d\n", - raw_smp_processor_id()); - - /* 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 check_hw() anyway. */ - if (!mutex_trylock(&efx->mac_lock)) - goto out_requeue; - if (!efx->port_enabled) - goto out_unlock; - rc = efx->board_info.monitor(efx); - if (rc) { - EFX_ERR(efx, "Board sensor %s; shutting down PHY\n", - (rc == -ERANGE) ? "reported fault" : "failed"); - efx->phy_mode |= PHY_MODE_LOW_POWER; - falcon_sim_phy_event(efx); - } - efx->phy_op->poll(efx); - efx->mac_op->poll(efx); - -out_unlock: - mutex_unlock(&efx->mac_lock); -out_requeue: - 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) -{ - struct efx_nic *efx = netdev_priv(net_dev); - struct mii_ioctl_data *data = if_mii(ifr); - - EFX_ASSERT_RESET_SERIALISED(efx); - - /* 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); -} - -/************************************************************************** - * - * NAPI interface - * - **************************************************************************/ - -static int efx_init_napi(struct efx_nic *efx) -{ - struct efx_channel *channel; - - efx_for_each_channel(channel, efx) { - channel->napi_dev = efx->net_dev; - netif_napi_add(channel->napi_dev, &channel->napi_str, - efx_poll, napi_weight); - } - return 0; -} - -static void efx_fini_napi(struct efx_nic *efx) -{ - struct efx_channel *channel; - - efx_for_each_channel(channel, efx) { - if (channel->napi_dev) - netif_napi_del(&channel->napi_str); - channel->napi_dev = NULL; - } -} - -/************************************************************************** - * - * 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) -{ - struct efx_nic *efx = netdev_priv(net_dev); - struct efx_channel *channel; - - efx_for_each_channel(channel, efx) - efx_schedule_channel(channel); -} - -#endif - -/************************************************************************** - * - * Kernel net device interface - * - *************************************************************************/ - -/* Context: process, rtnl_lock() held. */ -static int efx_net_open(struct net_device *net_dev) -{ - struct efx_nic *efx = netdev_priv(net_dev); - EFX_ASSERT_RESET_SERIALISED(efx); - - EFX_LOG(efx, "opening device %s on CPU %d\n", net_dev->name, - raw_smp_processor_id()); - - if (efx->state == STATE_DISABLED) - return -EIO; - if (efx->phy_mode & PHY_MODE_SPECIAL) - return -EBUSY; - - efx_start_all(efx); - return 0; -} - -/* Context: process, rtnl_lock() held. - * Note that the kernel will ignore our return code; this method - * should really be a void. - */ -static int efx_net_stop(struct net_device *net_dev) -{ - struct efx_nic *efx = netdev_priv(net_dev); - - EFX_LOG(efx, "closing %s on CPU %d\n", net_dev->name, - raw_smp_processor_id()); - - if (efx->state != STATE_DISABLED) { - /* Stop the device and flush all the channels */ - efx_stop_all(efx); - efx_fini_channels(efx); - efx_init_channels(efx); - } - - return 0; -} - -void efx_stats_disable(struct efx_nic *efx) -{ - spin_lock(&efx->stats_lock); - ++efx->stats_disable_count; - spin_unlock(&efx->stats_lock); -} - -void efx_stats_enable(struct efx_nic *efx) -{ - spin_lock(&efx->stats_lock); - --efx->stats_disable_count; - spin_unlock(&efx->stats_lock); -} - -/* Context: process, dev_base_lock or RTNL held, non-blocking. */ -static struct net_device_stats *efx_net_stats(struct net_device *net_dev) -{ - struct efx_nic *efx = netdev_priv(net_dev); - struct efx_mac_stats *mac_stats = &efx->mac_stats; - struct net_device_stats *stats = &net_dev->stats; - - /* Update stats if possible, but do not wait if another thread - * is updating them or if MAC stats fetches are temporarily - * disabled; slightly stale stats are acceptable. - */ - if (!spin_trylock(&efx->stats_lock)) - return stats; - if (!efx->stats_disable_count) { - efx->mac_op->update_stats(efx); - falcon_update_nic_stats(efx); - } - spin_unlock(&efx->stats_lock); - - stats->rx_packets = mac_stats->rx_packets; - stats->tx_packets = mac_stats->tx_packets; - stats->rx_bytes = mac_stats->rx_bytes; - stats->tx_bytes = mac_stats->tx_bytes; - stats->multicast = mac_stats->rx_multicast; - stats->collisions = mac_stats->tx_collision; - stats->rx_length_errors = (mac_stats->rx_gtjumbo + - mac_stats->rx_length_error); - stats->rx_over_errors = efx->n_rx_nodesc_drop_cnt; - stats->rx_crc_errors = mac_stats->rx_bad; - stats->rx_frame_errors = mac_stats->rx_align_error; - stats->rx_fifo_errors = mac_stats->rx_overflow; - stats->rx_missed_errors = mac_stats->rx_missed; - stats->tx_window_errors = mac_stats->tx_late_collision; - - stats->rx_errors = (stats->rx_length_errors + - stats->rx_over_errors + - stats->rx_crc_errors + - stats->rx_frame_errors + - stats->rx_fifo_errors + - stats->rx_missed_errors + - mac_stats->rx_symbol_error); - stats->tx_errors = (stats->tx_window_errors + - mac_stats->tx_bad); - - return stats; -} - -/* Context: netif_tx_lock held, BHs disabled. */ -static void efx_watchdog(struct net_device *net_dev) -{ - struct efx_nic *efx = netdev_priv(net_dev); - - EFX_ERR(efx, "TX stuck with stop_count=%d port_enabled=%d:" - " resetting channels\n", - atomic_read(&efx->netif_stop_count), efx->port_enabled); - - efx_schedule_reset(efx, RESET_TYPE_TX_WATCHDOG); -} - - -/* Context: process, rtnl_lock() held. */ -static int efx_change_mtu(struct net_device *net_dev, int new_mtu) -{ - struct efx_nic *efx = netdev_priv(net_dev); - int rc = 0; - - EFX_ASSERT_RESET_SERIALISED(efx); - - if (new_mtu > EFX_MAX_MTU) - return -EINVAL; - - efx_stop_all(efx); - - EFX_LOG(efx, "changing MTU to %d\n", new_mtu); - - efx_fini_channels(efx); - net_dev->mtu = new_mtu; - efx_init_channels(efx); - - efx_start_all(efx); - return rc; -} - -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; - char *new_addr = addr->sa_data; - - EFX_ASSERT_RESET_SERIALISED(efx); - - if (!is_valid_ether_addr(new_addr)) { - EFX_ERR(efx, "invalid ethernet MAC address requested: %pM\n", - new_addr); - return -EINVAL; - } - - memcpy(net_dev->dev_addr, new_addr, net_dev->addr_len); - - /* Reconfigure the MAC */ - efx_reconfigure_port(efx); - - return 0; -} - -/* Context: netif_addr_lock held, BHs disabled. */ -static void efx_set_multicast_list(struct net_device *net_dev) -{ - struct efx_nic *efx = netdev_priv(net_dev); - struct dev_mc_list *mc_list = net_dev->mc_list; - union efx_multicast_hash *mc_hash = &efx->multicast_hash; - bool promiscuous = !!(net_dev->flags & IFF_PROMISC); - bool changed = (efx->promiscuous != promiscuous); - u32 crc; - int bit; - int i; - - efx->promiscuous = promiscuous; - - /* Build multicast hash table */ - if (promiscuous || (net_dev->flags & IFF_ALLMULTI)) { - memset(mc_hash, 0xff, sizeof(*mc_hash)); - } else { - memset(mc_hash, 0x00, sizeof(*mc_hash)); - for (i = 0; i < net_dev->mc_count; i++) { - crc = ether_crc_le(ETH_ALEN, mc_list->dmi_addr); - bit = crc & (EFX_MCAST_HASH_ENTRIES - 1); - set_bit_le(bit, mc_hash->byte); - mc_list = mc_list->next; - } - } - - if (!efx->port_enabled) - /* Delay pushing settings until efx_start_port() */ - return; - - if (changed) - queue_work(efx->workqueue, &efx->phy_work); - - /* Create and activate new global multicast hash table */ - falcon_set_multicast_hash(efx); -} - -static const struct net_device_ops efx_netdev_ops = { - .ndo_open = efx_net_open, - .ndo_stop = efx_net_stop, - .ndo_get_stats = 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_multicast_list = efx_set_multicast_list, -#ifdef CONFIG_NET_POLL_CONTROLLER - .ndo_poll_controller = efx_netpoll, -#endif -}; - -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 = 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 = pci_get_drvdata(to_pci_dev(dev)); - return sprintf(buf, "%d\n", efx->phy_type); -} -static DEVICE_ATTR(phy_type, 0644, show_phy_type, NULL); - -static int efx_register_netdev(struct efx_nic *efx) -{ - struct net_device *net_dev = efx->net_dev; - int rc; - - net_dev->watchdog_timeo = 5 * HZ; - net_dev->irq = efx->pci_dev->irq; - net_dev->netdev_ops = &efx_netdev_ops; - SET_NETDEV_DEV(net_dev, &efx->pci_dev->dev); - SET_ETHTOOL_OPS(net_dev, &efx_ethtool_ops); - - /* Always start with carrier off; PHY events will detect the link */ - netif_carrier_off(efx->net_dev); - - /* Clear MAC statistics */ - efx->mac_op->update_stats(efx); - memset(&efx->mac_stats, 0, sizeof(efx->mac_stats)); - - rc = register_netdev(net_dev); - if (rc) { - EFX_ERR(efx, "could not register net dev\n"); - return rc; - } - - rtnl_lock(); - efx_update_name(efx); - rtnl_unlock(); - - rc = device_create_file(&efx->pci_dev->dev, &dev_attr_phy_type); - if (rc) { - EFX_ERR(efx, "failed to init net dev attributes\n"); - goto fail_registered; - } - - return 0; - -fail_registered: - unregister_netdev(net_dev); - return rc; -} - -static void efx_unregister_netdev(struct efx_nic *efx) -{ - struct efx_tx_queue *tx_queue; - - if (!efx->net_dev) - return; - - BUG_ON(netdev_priv(efx->net_dev) != efx); - - /* Free up any skbs still remaining. This has to happen before - * we try to unregister the netdev as running their destructors - * may be needed to get the device ref. count to 0. */ - efx_for_each_tx_queue(tx_queue, efx) - efx_release_tx_buffers(tx_queue); - - if (efx_dev_registered(efx)) { - strlcpy(efx->name, pci_name(efx->pci_dev), sizeof(efx->name)); - device_remove_file(&efx->pci_dev->dev, &dev_attr_phy_type); - unregister_netdev(efx->net_dev); - } -} - -/************************************************************************** - * - * Device reset and suspend - * - **************************************************************************/ - -/* 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, - struct ethtool_cmd *ecmd) -{ - EFX_ASSERT_RESET_SERIALISED(efx); - - efx_stats_disable(efx); - efx_stop_all(efx); - mutex_lock(&efx->mac_lock); - mutex_lock(&efx->spi_lock); - - efx->phy_op->get_settings(efx, ecmd); - - efx_fini_channels(efx); - if (efx->port_initialized && method != RESET_TYPE_INVISIBLE) - efx->phy_op->fini(efx); -} - -/* 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, - struct ethtool_cmd *ecmd, bool ok) -{ - int rc; - - EFX_ASSERT_RESET_SERIALISED(efx); - - rc = falcon_init_nic(efx); - if (rc) { - EFX_ERR(efx, "failed to initialise NIC\n"); - ok = false; - } - - if (efx->port_initialized && method != RESET_TYPE_INVISIBLE) { - if (ok) { - rc = efx->phy_op->init(efx); - if (rc) - ok = false; - } - if (!ok) - efx->port_initialized = false; - } - - if (ok) { - efx_init_channels(efx); - - if (efx->phy_op->set_settings(efx, ecmd)) - EFX_ERR(efx, "could not restore PHY settings\n"); - } - - mutex_unlock(&efx->spi_lock); - mutex_unlock(&efx->mac_lock); - - if (ok) { - efx_start_all(efx); - efx_stats_enable(efx); - } - return rc; -} - -/* Reset the NIC as transparently as possible. Do not reset the PHY - * Note that the reset may fail, in which case the card will be left - * in a most-probably-unusable state. - * - * This function will sleep. You cannot reset from within an atomic - * state; use efx_schedule_reset() instead. - * - * Grabs the rtnl_lock. - */ -static int efx_reset(struct efx_nic *efx) -{ - struct ethtool_cmd ecmd; - enum reset_type method = efx->reset_pending; - int rc = 0; - - /* Serialise with kernel interfaces */ - rtnl_lock(); - - /* If we're not RUNNING then don't reset. Leave the reset_pending - * flag set so that efx_pci_probe_main will be retried */ - if (efx->state != STATE_RUNNING) { - EFX_INFO(efx, "scheduled reset quenched. NIC not RUNNING\n"); - goto out_unlock; - } - - EFX_INFO(efx, "resetting (%d)\n", method); - - efx_reset_down(efx, method, &ecmd); - - rc = falcon_reset_hw(efx, method); - if (rc) { - EFX_ERR(efx, "failed to reset hardware\n"); - goto out_disable; - } - - /* Allow resets to be rescheduled. */ - efx->reset_pending = RESET_TYPE_NONE; - - /* 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); - - /* Leave device stopped if necessary */ - if (method == RESET_TYPE_DISABLE) { - efx_reset_up(efx, method, &ecmd, false); - rc = -EIO; - } else { - rc = efx_reset_up(efx, method, &ecmd, true); - } - -out_disable: - if (rc) { - EFX_ERR(efx, "has been disabled\n"); - efx->state = STATE_DISABLED; - dev_close(efx->net_dev); - } else { - EFX_LOG(efx, "reset complete\n"); - } - -out_unlock: - rtnl_unlock(); - 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 *nic = container_of(data, struct efx_nic, reset_work); - - efx_reset(nic); -} - -void efx_schedule_reset(struct efx_nic *efx, enum reset_type type) -{ - enum reset_type method; - - if (efx->reset_pending != RESET_TYPE_NONE) { - EFX_INFO(efx, "quenching already scheduled reset\n"); - return; - } - - switch (type) { - case RESET_TYPE_INVISIBLE: - case RESET_TYPE_ALL: - case RESET_TYPE_WORLD: - case RESET_TYPE_DISABLE: - method = type; - break; - case RESET_TYPE_RX_RECOVERY: - case RESET_TYPE_RX_DESC_FETCH: - case RESET_TYPE_TX_DESC_FETCH: - case RESET_TYPE_TX_SKIP: - method = RESET_TYPE_INVISIBLE; - break; - default: - method = RESET_TYPE_ALL; - break; - } - - if (method != type) - EFX_LOG(efx, "scheduling reset (%d:%d)\n", type, method); - else - EFX_LOG(efx, "scheduling reset (%d)\n", method); - - efx->reset_pending = method; - - queue_work(reset_workqueue, &efx->reset_work); -} - -/************************************************************************** - * - * List of NICs we support - * - **************************************************************************/ - -/* PCI device ID table */ -static struct pci_device_id efx_pci_table[] __devinitdata = { - {PCI_DEVICE(EFX_VENDID_SFC, FALCON_A_P_DEVID), - .driver_data = (unsigned long) &falcon_a_nic_type}, - {PCI_DEVICE(EFX_VENDID_SFC, FALCON_B_P_DEVID), - .driver_data = (unsigned long) &falcon_b_nic_type}, - {0} /* end of list */ -}; - -/************************************************************************** - * - * Dummy PHY/MAC/Board 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) {} -void efx_port_dummy_op_blink(struct efx_nic *efx, bool blink) {} - -static struct efx_mac_operations efx_dummy_mac_operations = { - .reconfigure = efx_port_dummy_op_void, - .poll = efx_port_dummy_op_void, - .irq = efx_port_dummy_op_void, -}; - -static struct efx_phy_operations efx_dummy_phy_operations = { - .init = efx_port_dummy_op_int, - .reconfigure = efx_port_dummy_op_void, - .poll = efx_port_dummy_op_void, - .fini = efx_port_dummy_op_void, - .clear_interrupt = efx_port_dummy_op_void, -}; - -static struct efx_board efx_dummy_board_info = { - .init = efx_port_dummy_op_int, - .init_leds = efx_port_dummy_op_void, - .set_id_led = efx_port_dummy_op_blink, - .monitor = efx_port_dummy_op_int, - .blink = efx_port_dummy_op_blink, - .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). - */ -static int efx_init_struct(struct efx_nic *efx, struct efx_nic_type *type, - struct pci_dev *pci_dev, struct net_device *net_dev) -{ - struct efx_channel *channel; - struct efx_tx_queue *tx_queue; - struct efx_rx_queue *rx_queue; - int i; - - /* Initialise common structures */ - memset(efx, 0, sizeof(*efx)); - spin_lock_init(&efx->biu_lock); - spin_lock_init(&efx->phy_lock); - mutex_init(&efx->spi_lock); - INIT_WORK(&efx->reset_work, efx_reset_work); - INIT_DELAYED_WORK(&efx->monitor_work, efx_monitor); - efx->pci_dev = pci_dev; - efx->state = STATE_INIT; - efx->reset_pending = RESET_TYPE_NONE; - strlcpy(efx->name, pci_name(pci_dev), sizeof(efx->name)); - efx->board_info = efx_dummy_board_info; - - efx->net_dev = net_dev; - efx->rx_checksum_enabled = true; - spin_lock_init(&efx->netif_stop_lock); - spin_lock_init(&efx->stats_lock); - efx->stats_disable_count = 1; - mutex_init(&efx->mac_lock); - efx->mac_op = &efx_dummy_mac_operations; - efx->phy_op = &efx_dummy_phy_operations; - efx->mdio.dev = net_dev; - INIT_WORK(&efx->phy_work, efx_phy_work); - INIT_WORK(&efx->mac_work, efx_mac_work); - atomic_set(&efx->netif_stop_count, 1); - - for (i = 0; i < EFX_MAX_CHANNELS; i++) { - channel = &efx->channel[i]; - channel->efx = efx; - channel->channel = i; - channel->work_pending = false; - } - for (i = 0; i < EFX_TX_QUEUE_COUNT; i++) { - tx_queue = &efx->tx_queue[i]; - tx_queue->efx = efx; - tx_queue->queue = i; - tx_queue->buffer = NULL; - tx_queue->channel = &efx->channel[0]; /* for safety */ - tx_queue->tso_headers_free = NULL; - } - for (i = 0; i < EFX_MAX_RX_QUEUES; i++) { - rx_queue = &efx->rx_queue[i]; - rx_queue->efx = efx; - rx_queue->queue = i; - rx_queue->channel = &efx->channel[0]; /* for safety */ - rx_queue->buffer = NULL; - spin_lock_init(&rx_queue->add_lock); - INIT_DELAYED_WORK(&rx_queue->work, efx_rx_work); - } - - efx->type = type; - - /* Sanity-check NIC type */ - EFX_BUG_ON_PARANOID(efx->type->txd_ring_mask & - (efx->type->txd_ring_mask + 1)); - EFX_BUG_ON_PARANOID(efx->type->rxd_ring_mask & - (efx->type->rxd_ring_mask + 1)); - EFX_BUG_ON_PARANOID(efx->type->evq_size & - (efx->type->evq_size - 1)); - /* As close as we can get to guaranteeing that we don't overflow */ - EFX_BUG_ON_PARANOID(efx->type->evq_size < - (efx->type->txd_ring_mask + 1 + - efx->type->rxd_ring_mask + 1)); - EFX_BUG_ON_PARANOID(efx->type->phys_addr_channels > EFX_MAX_CHANNELS); - - /* Higher numbered interrupt modes are less capable! */ - efx->interrupt_mode = max(efx->type->max_interrupt_mode, - interrupt_mode); - - /* 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) - return -ENOMEM; - - return 0; -} - -static void efx_fini_struct(struct efx_nic *efx) -{ - if (efx->workqueue) { - destroy_workqueue(efx->workqueue); - efx->workqueue = NULL; - } -} - -/************************************************************************** - * - * 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) -{ - EFX_ASSERT_RESET_SERIALISED(efx); - - /* Skip everything if we never obtained a valid membase */ - if (!efx->membase) - return; - - efx_fini_channels(efx); - efx_fini_port(efx); - - /* Shutdown the board, then the NIC and board state */ - efx->board_info.fini(efx); - falcon_fini_interrupt(efx); - - efx_fini_napi(efx); - efx_remove_all(efx); -} - -/* Final NIC shutdown - * This is called only at module unload (or hotplug removal). - */ -static void efx_pci_remove(struct pci_dev *pci_dev) -{ - struct efx_nic *efx; - - efx = pci_get_drvdata(pci_dev); - if (!efx) - return; - - /* Mark the NIC as fini, then stop the interface */ - rtnl_lock(); - efx->state = STATE_FINI; - dev_close(efx->net_dev); - - /* Allow any queued efx_resets() to complete */ - rtnl_unlock(); - - if (efx->membase == NULL) - goto out; - - efx_unregister_netdev(efx); - - efx_mtd_remove(efx); - - /* Wait for any scheduled resets to complete. No more will be - * scheduled from this point because efx_stop_all() has been - * called, we are no longer registered with driverlink, and - * the net_device's have been removed. */ - cancel_work_sync(&efx->reset_work); - - efx_pci_remove_main(efx); - -out: - efx_fini_io(efx); - EFX_LOG(efx, "shutdown successful\n"); - - pci_set_drvdata(pci_dev, NULL); - efx_fini_struct(efx); - free_netdev(efx->net_dev); -}; - -/* 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; - - rc = efx_init_napi(efx); - if (rc) - goto fail2; - - /* Initialise the board */ - rc = efx->board_info.init(efx); - if (rc) { - EFX_ERR(efx, "failed to initialise board\n"); - goto fail3; - } - - rc = falcon_init_nic(efx); - if (rc) { - EFX_ERR(efx, "failed to initialise NIC\n"); - goto fail4; - } - - rc = efx_init_port(efx); - if (rc) { - EFX_ERR(efx, "failed to initialise port\n"); - goto fail5; - } - - efx_init_channels(efx); - - rc = falcon_init_interrupt(efx); - if (rc) - goto fail6; - - return 0; - - fail6: - efx_fini_channels(efx); - efx_fini_port(efx); - fail5: - fail4: - efx->board_info.fini(efx); - fail3: - efx_fini_napi(efx); - fail2: - efx_remove_all(efx); - fail1: - return rc; -} - -/* NIC initialisation - * - * This is called at module load (or hotplug insertion, - * theoretically). It sets up PCI mappings, tests and 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 __devinit efx_pci_probe(struct pci_dev *pci_dev, - const struct pci_device_id *entry) -{ - struct efx_nic_type *type = (struct efx_nic_type *) entry->driver_data; - struct net_device *net_dev; - struct efx_nic *efx; - int i, rc; - - /* Allocate and initialise a struct net_device and struct efx_nic */ - net_dev = alloc_etherdev(sizeof(*efx)); - if (!net_dev) - return -ENOMEM; - net_dev->features |= (NETIF_F_IP_CSUM | NETIF_F_SG | - NETIF_F_HIGHDMA | NETIF_F_TSO | - NETIF_F_GRO); - /* Mask for features that also apply to VLAN devices */ - net_dev->vlan_features |= (NETIF_F_ALL_CSUM | NETIF_F_SG | - NETIF_F_HIGHDMA | NETIF_F_TSO); - efx = netdev_priv(net_dev); - pci_set_drvdata(pci_dev, efx); - rc = efx_init_struct(efx, type, pci_dev, net_dev); - if (rc) - goto fail1; - - EFX_INFO(efx, "Solarflare Communications NIC detected\n"); - - /* Set up basic I/O (BAR mappings etc) */ - rc = efx_init_io(efx); - if (rc) - goto fail2; - - /* No serialisation is required with the reset path because - * we're in STATE_INIT. */ - for (i = 0; i < 5; i++) { - rc = efx_pci_probe_main(efx); - - /* Serialise against efx_reset(). No more resets will be - * scheduled since efx_stop_all() has been called, and we - * have not and never have been registered with either - * the rtnetlink or driverlink layers. */ - cancel_work_sync(&efx->reset_work); - - if (rc == 0) { - if (efx->reset_pending != RESET_TYPE_NONE) { - /* If there was a scheduled reset during - * probe, the NIC is probably hosed anyway */ - efx_pci_remove_main(efx); - rc = -EIO; - } else { - break; - } - } - - /* Retry if a recoverably reset event has been scheduled */ - if ((efx->reset_pending != RESET_TYPE_INVISIBLE) && - (efx->reset_pending != RESET_TYPE_ALL)) - goto fail3; - - efx->reset_pending = RESET_TYPE_NONE; - } - - if (rc) { - EFX_ERR(efx, "Could not reset NIC\n"); - goto fail4; - } - - /* Switch to the running state before we expose the device to - * the OS. This is to ensure that the initial gathering of - * MAC stats succeeds. */ - efx->state = STATE_RUNNING; - - efx_mtd_probe(efx); /* allowed to fail */ - - rc = efx_register_netdev(efx); - if (rc) - goto fail5; - - EFX_LOG(efx, "initialisation successful\n"); - return 0; - - fail5: - efx_pci_remove_main(efx); - fail4: - fail3: - efx_fini_io(efx); - fail2: - efx_fini_struct(efx); - fail1: - EFX_LOG(efx, "initialisation failed. rc=%d\n", rc); - free_netdev(net_dev); - return rc; -} - -static struct pci_driver efx_pci_driver = { - .name = EFX_DRIVER_NAME, - .id_table = efx_pci_table, - .probe = efx_pci_probe, - .remove = efx_pci_remove, -}; - -/************************************************************************** - * - * 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; - - refill_workqueue = create_workqueue("sfc_refill"); - if (!refill_workqueue) { - rc = -ENOMEM; - goto err_refill; - } - reset_workqueue = create_singlethread_workqueue("sfc_reset"); - if (!reset_workqueue) { - rc = -ENOMEM; - goto err_reset; - } - - rc = pci_register_driver(&efx_pci_driver); - if (rc < 0) - goto err_pci; - - return 0; - - err_pci: - destroy_workqueue(reset_workqueue); - err_reset: - destroy_workqueue(refill_workqueue); - err_refill: - 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); - destroy_workqueue(reset_workqueue); - destroy_workqueue(refill_workqueue); - unregister_netdevice_notifier(&efx_netdev_notifier); - -} - -module_init(efx_init_module); -module_exit(efx_exit_module); - -MODULE_AUTHOR("Michael Brown <mbrown@fensystems.co.uk> and " - "Solarflare Communications"); -MODULE_DESCRIPTION("Solarflare Communications network driver"); -MODULE_LICENSE("GPL"); -MODULE_DEVICE_TABLE(pci, efx_pci_table); |