/**************************************************************************** * Driver for Solarflare Solarstorm network controllers and boards * Copyright 2005-2006 Fen Systems Ltd. * Copyright 2006-2008 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 #include #include #include #include #include #include #include #include #include #include #include "net_driver.h" #include "ethtool.h" #include "efx.h" #include "falcon.h" #include "selftest.h" #include "boards.h" #include "workarounds.h" #include "mac.h" /* * Loopback test packet structure * * The self-test should stress every RSS vector, and unfortunately * Falcon only performs RSS on TCP/UDP packets. */ struct efx_loopback_payload { struct ethhdr header; struct iphdr ip; struct udphdr udp; __be16 iteration; const char msg[64]; } __attribute__ ((packed)); /* Loopback test source MAC address */ static const unsigned char payload_source[ETH_ALEN] = { 0x00, 0x0f, 0x53, 0x1b, 0x1b, 0x1b, }; static const char *payload_msg = "Hello world! This is an Efx loopback test in progress!"; /** * efx_selftest_state - persistent state during a selftest * @flush: Drop all packets in efx_loopback_rx_packet * @packet_count: Number of packets being used in this test * @skbs: An array of skbs transmitted * @rx_good: RX good packet count * @rx_bad: RX bad packet count * @payload: Payload used in tests */ struct efx_selftest_state { bool flush; int packet_count; struct sk_buff **skbs; /* Checksums are being offloaded */ bool offload_csum; atomic_t rx_good; atomic_t rx_bad; struct efx_loopback_payload payload; }; /************************************************************************** * * Configurable values * **************************************************************************/ /* Level of loopback testing * * The maximum packet burst length is 16**(n-1), i.e. * * - Level 0 : no packets * - Level 1 : 1 packet * - Level 2 : 17 packets (1 * 1 packet, 1 * 16 packets) * - Level 3 : 273 packets (1 * 1 packet, 1 * 16 packet, 1 * 256 packets) * */ static unsigned int loopback_test_level = 3; /************************************************************************** * * Interrupt and event queue testing * **************************************************************************/ /* Test generation and receipt of interrupts */ static int efx_test_interrupts(struct efx_nic *efx, struct efx_self_tests *tests) { struct efx_channel *channel; EFX_LOG(efx, "testing interrupts\n"); tests->interrupt = -1; /* Reset interrupt flag */ efx->last_irq_cpu = -1; smp_wmb(); /* ACK each interrupting event queue. Receiving an interrupt due to * traffic before a test event is raised is considered a pass */ efx_for_each_channel(channel, efx) { if (channel->work_pending) efx_process_channel_now(channel); if (efx->last_irq_cpu >= 0) goto success; } falcon_generate_interrupt(efx); /* Wait for arrival of test interrupt. */ EFX_LOG(efx, "waiting for test interrupt\n"); schedule_timeout_uninterruptible(HZ / 10); if (efx->last_irq_cpu >= 0) goto success; EFX_ERR(efx, "timed out waiting for interrupt\n"); return -ETIMEDOUT; success: EFX_LOG(efx, "test interrupt (mode %d) seen on CPU%d\n", efx->interrupt_mode, efx->last_irq_cpu); tests->interrupt = 1; return 0; } /* Test generation and receipt of interrupting events */ static int efx_test_eventq_irq(struct efx_channel *channel, struct efx_self_tests *tests) { unsigned int magic, count; /* Channel specific code, limited to 20 bits */ magic = (0x00010150 + channel->channel); EFX_LOG(channel->efx, "channel %d testing event queue with code %x\n", channel->channel, magic); tests->eventq_dma[channel->channel] = -1; tests->eventq_int[channel->channel] = -1; tests->eventq_poll[channel->channel] = -1; /* Reset flag and zero magic word */ channel->efx->last_irq_cpu = -1; channel->eventq_magic = 0; smp_wmb(); falcon_generate_test_event(channel, magic); /* Wait for arrival of interrupt */ count = 0; do { schedule_timeout_uninterruptible(HZ / 100); if (channel->work_pending) efx_process_channel_now(channel); if (channel->eventq_magic == magic) goto eventq_ok; } while (++count < 2); EFX_ERR(channel->efx, "channel %d timed out waiting for event queue\n", channel->channel); /* See if interrupt arrived */ if (channel->efx->last_irq_cpu >= 0) { EFX_ERR(channel->efx, "channel %d saw interrupt on CPU%d " "during event queue test\n", channel->channel, raw_smp_processor_id()); tests->eventq_int[channel->channel] = 1; } /* Check to see if event was received even if interrupt wasn't */ efx_process_channel_now(channel); if (channel->eventq_magic == magic) { EFX_ERR(channel->efx, "channel %d event was generated, but " "failed to trigger an interrupt\n", channel->channel); tests->eventq_dma[channel->channel] = 1; } return -ETIMEDOUT; eventq_ok: EFX_LOG(channel->efx, "channel %d event queue passed\n", channel->channel); tests->eventq_dma[channel->channel] = 1; tests->eventq_int[channel->channel] = 1; tests->eventq_poll[channel->channel] = 1; return 0; } /************************************************************************** * * PHY testing * **************************************************************************/ /* Check PHY presence by reading the PHY ID registers */ static int efx_test_phy(struct efx_nic *efx, struct efx_self_tests *tests) { u16 physid1, physid2; struct mii_if_info *mii = &efx->mii; struct net_device *net_dev = efx->net_dev; if (efx->phy_type == PHY_TYPE_NONE) return 0; EFX_LOG(efx, "testing PHY presence\n"); tests->phy_ok = -1; physid1 = mii->mdio_read(net_dev, mii->phy_id, MII_PHYSID1); physid2 = mii->mdio_read(net_dev, mii->phy_id, MII_PHYSID2); if ((physid1 != 0x0000) && (physid1 != 0xffff) && (physid2 != 0x0000) && (physid2 != 0xffff)) { EFX_LOG(efx, "found MII PHY %d ID 0x%x:%x\n", mii->phy_id, physid1, physid2); tests->phy_ok = 1; return 0; } EFX_ERR(efx, "no MII PHY present with ID %d\n", mii->phy_id); return -ENODEV; } /************************************************************************** * * Loopback testing * NB Only one loopback test can be executing concurrently. * **************************************************************************/ /* Loopback test RX callback * This is called for each received packet during loopback testing. */ void efx_loopback_rx_packet(struct efx_nic *efx, const char *buf_ptr, int pkt_len) { struct efx_selftest_state *state = efx->loopback_selftest; struct efx_loopback_payload *received; struct efx_loopback_payload *payload; BUG_ON(!buf_ptr); /* If we are just flushing, then drop the packet */ if ((state == NULL) || state->flush) return; payload = &state->payload; received = (struct efx_loopback_payload *) buf_ptr; received->ip.saddr = payload->ip.saddr; if (state->offload_csum) received->ip.check = payload->ip.check; /* Check that header exists */ if (pkt_len < sizeof(received->header)) { EFX_ERR(efx, "saw runt RX packet (length %d) in %s loopback " "test\n", pkt_len, LOOPBACK_MODE(efx)); goto err; } /* Check that the ethernet header exists */ if (memcmp(&received->header, &payload->header, ETH_HLEN) != 0) { EFX_ERR(efx, "saw non-loopback RX packet in %s loopback test\n", LOOPBACK_MODE(efx)); goto err; } /* Check packet length */ if (pkt_len != sizeof(*payload)) { EFX_ERR(efx, "saw incorrect RX packet length %d (wanted %d) in " "%s loopback test\n", pkt_len, (int)sizeof(*payload), LOOPBACK_MODE(efx)); goto err; } /* Check that IP header matches */ if (memcmp(&received->ip, &payload->ip, sizeof(payload->ip)) != 0) { EFX_ERR(efx, "saw corrupted IP header in %s loopback test\n", LOOPBACK_MODE(efx)); goto err; } /* Check that msg and padding matches */ if (memcmp(&received->msg, &payload->msg, sizeof(received->msg)) != 0) { EFX_ERR(efx, "saw corrupted RX packet in %s loopback test\n", LOOPBACK_MODE(efx)); goto err; } /* Check that iteration matches */ if (received->iteration != payload->iteration) { EFX_ERR(efx, "saw RX packet from iteration %d (wanted %d) in " "%s loopback test\n", ntohs(received->iteration), ntohs(payload->iteration), LOOPBACK_MODE(efx)); goto err; } /* Increase correct RX count */ EFX_TRACE(efx, "got loopback RX in %s loopback test\n", LOOPBACK_MODE(efx)); atomic_inc(&state->rx_good); return; err: #ifdef EFX_ENABLE_DEBUG if (atomic_read(&state->rx_bad) == 0) { EFX_ERR(efx, "received packet:\n"); print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 0x10, 1, buf_ptr, pkt_len, 0); EFX_ERR(efx, "expected packet:\n"); print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 0x10, 1, &state->payload, sizeof(state->payload), 0); } #endif atomic_inc(&state->rx_bad); } /* Initialise an efx_selftest_state for a new iteration */ static void efx_iterate_state(struct efx_nic *efx) { struct efx_selftest_state *state = efx->loopback_selftest; struct net_device *net_dev = efx->net_dev; struct efx_loopback_payload *payload = &state->payload; /* Initialise the layerII header */ memcpy(&payload->header.h_dest, net_dev->dev_addr, ETH_ALEN); memcpy(&payload->header.h_source, &payload_source, ETH_ALEN); payload->header.h_proto = htons(ETH_P_IP); /* saddr set later and used as incrementing count */ payload->ip.daddr = htonl(INADDR_LOOPBACK); payload->ip.ihl = 5; payload->ip.check = htons(0xdead); payload->ip.tot_len = htons(sizeof(*payload) - sizeof(struct ethhdr)); payload->ip.version = IPVERSION; payload->ip.protocol = IPPROTO_UDP; /* Initialise udp header */ payload->udp.source = 0; payload->udp.len = htons(sizeof(*payload) - sizeof(struct ethhdr) - sizeof(struct iphdr)); payload->udp.check = 0; /* checksum ignored */ /* Fill out payload */ payload->iteration = htons(ntohs(payload->iteration) + 1); memcpy(&payload->msg, payload_msg, sizeof(payload_msg)); /* Fill out remaining state members */ atomic_set(&state->rx_good, 0); atomic_set(&state->rx_bad, 0); smp_wmb(); } static int efx_begin_loopback(struct efx_tx_queue *tx_queue) { struct efx_nic *efx = tx_queue->efx; struct efx_selftest_state *state = efx->loopback_selftest; struct efx_loopback_payload *payload; struct sk_buff *skb; int i, rc; /* Transmit N copies of buffer */ for (i = 0; i < state->packet_count; i++) { /* Allocate an skb, holding an extra reference for * transmit completion counting */ skb = alloc_skb(sizeof(state->payload), GFP_KERNEL); if (!skb) return -ENOMEM; state->skbs[i] = skb; skb_get(skb); /* Copy the payload in, incrementing the source address to * exercise the rss vectors */ payload = ((struct efx_loopback_payload *) skb_put(skb, sizeof(state->payload))); memcpy(payload, &state->payload, sizeof(state->payload)); payload->ip.saddr = htonl(INADDR_LOOPBACK | (i << 2)); /* Ensure everything we've written is visible to the * interrupt handler. */ smp_wmb(); if (efx_dev_registered(efx)) netif_tx_lock_bh(efx->net_dev); rc = efx_xmit(efx, tx_queue, skb); if (efx_dev_registered(efx)) netif_tx_unlock_bh(efx->net_dev); if (rc != NETDEV_TX_OK) { EFX_ERR(efx, "TX queue %d could not transmit packet %d " "of %d in %s loopback test\n", tx_queue->queue, i + 1, state->packet_count, LOOPBACK_MODE(efx)); /* Defer cleaning up the other skbs for the caller */ kfree_skb(skb); return -EPIPE; } } return 0; } static int efx_poll_loopback(struct efx_nic *efx) { struct efx_selftest_state *state = efx->loopback_selftest; struct efx_channel *channel; /* NAPI polling is not enabled, so process channels * synchronously */ efx_for_each_channel(channel, efx) { if (channel->work_pending) efx_process_channel_now(channel); } return atomic_read(&state->rx_good) == state->packet_count; } static int efx_end_loopback(struct efx_tx_queue *tx_queue, struct efx_loopback_self_tests *lb_tests) { struct efx_nic *efx = tx_queue->efx; struct efx_selftest_state *state = efx->loopback_selftest; struct sk_buff *skb; int tx_done = 0, rx_good, rx_bad; int i, rc = 0; if (efx_dev_registered(efx)) netif_tx_lock_bh(efx->net_dev); /* Count the number of tx completions, and decrement the refcnt. Any * skbs not already completed will be free'd when the queue is flushed */ for (i=0; i < state->packet_count; i++) { skb = state->skbs[i]; if (skb && !skb_shared(skb)) ++tx_done; dev_kfree_skb_any(skb); } if (efx_dev_registered(efx)) netif_tx_unlock_bh(efx->net_dev); /* Check TX completion and received packet counts */ rx_good = atomic_read(&state->rx_good); rx_bad = atomic_read(&state->rx_bad); if (tx_done != state->packet_count) { /* Don't free the skbs; they will be picked up on TX * overflow or channel teardown. */ EFX_ERR(efx, "TX queue %d saw only %d out of an expected %d " "TX completion events in %s loopback test\n", tx_queue->queue, tx_done, state->packet_count, LOOPBACK_MODE(efx)); rc = -ETIMEDOUT; /* Allow to fall through so we see the RX errors as well */ } /* We may always be up to a flush away from our desired packet total */ if (rx_good != state->packet_count) { EFX_LOG(efx, "TX queue %d saw only %d out of an expected %d " "received packets in %s loopback test\n", tx_queue->queue, rx_good, state->packet_count, LOOPBACK_MODE(efx)); rc = -ETIMEDOUT; /* Fall through */ } /* Update loopback test structure */ lb_tests->tx_sent[tx_queue->queue] += state->packet_count; lb_tests->tx_done[tx_queue->queue] += tx_done; lb_tests->rx_good += rx_good; lb_tests->rx_bad += rx_bad; return rc; } static int efx_test_loopback(struct efx_tx_queue *tx_queue, struct efx_loopback_self_tests *lb_tests) { struct efx_nic *efx = tx_queue->efx; struct efx_selftest_state *state = efx->loopback_selftest; int i, begin_rc, end_rc; for (i = 0; i < loopback_test_level; i++) { /* Determine how many packets to send */ state->packet_count = (efx->type->txd_ring_mask + 1) / 3; state->packet_count = min(1 << (i << 2), state->packet_count); state->skbs = kzalloc(sizeof(state->skbs[0]) * state->packet_count, GFP_KERNEL); if (!state->skbs) return -ENOMEM; state->flush = false; EFX_LOG(efx, "TX queue %d testing %s loopback with %d " "packets\n", tx_queue->queue, LOOPBACK_MODE(efx), state->packet_count); efx_iterate_state(efx); begin_rc = efx_begin_loopback(tx_queue); /* This will normally complete very quickly, but be * prepared to wait up to 100 ms. */ msleep(1); if (!efx_poll_loopback(efx)) { msleep(100); efx_poll_loopback(efx); } end_rc = efx_end_loopback(tx_queue, lb_tests); kfree(state->skbs); if (begin_rc || end_rc) { /* Wait a while to ensure there are no packets * floating around after a failure. */ schedule_timeout_uninterruptible(HZ / 10); return begin_rc ? begin_rc : end_rc; } } EFX_LOG(efx, "TX queue %d passed %s loopback test with a burst length " "of %d packets\n", tx_queue->queue, LOOPBACK_MODE(efx), state->packet_count); return 0; } static int efx_test_loopbacks(struct efx_nic *efx, struct efx_self_tests *tests, unsigned int loopback_modes) { struct efx_selftest_state *state = efx->loopback_selftest; struct ethtool_cmd ecmd, ecmd_loopback; struct efx_tx_queue *tx_queue; enum efx_loopback_mode old_mode, mode; bool link_up; int count, rc; rc = efx_ethtool_get_settings(efx->net_dev, &ecmd); if (rc) { EFX_ERR(efx, "could not get GMII settings\n"); return rc; } old_mode = efx->loopback_mode; /* Disable autonegotiation for the purposes of loopback */ memcpy(&ecmd_loopback, &ecmd, sizeof(ecmd_loopback)); if (ecmd_loopback.autoneg == AUTONEG_ENABLE) { ecmd_loopback.autoneg = AUTONEG_DISABLE; ecmd_loopback.duplex = DUPLEX_FULL; ecmd_loopback.speed = SPEED_10000; } rc = efx_ethtool_set_settings(efx->net_dev, &ecmd_loopback); if (rc) { EFX_ERR(efx, "could not disable autonegotiation\n"); goto out; } tests->loopback_speed = ecmd_loopback.speed; tests->loopback_full_duplex = ecmd_loopback.duplex; /* Test all supported loopback modes */ for (mode = LOOPBACK_NONE; mode < LOOPBACK_TEST_MAX; mode++) { if (!(loopback_modes & (1 << mode))) continue; /* Move the port into the specified loopback mode. */ state->flush = true; efx->loopback_mode = mode; efx_reconfigure_port(efx); /* Wait for the PHY to signal the link is up */ count = 0; do { struct efx_channel *channel = &efx->channel[0]; falcon_check_xmac(efx); schedule_timeout_uninterruptible(HZ / 10); if (channel->work_pending) efx_process_channel_now(channel); /* Wait for PHY events to be processed */ flush_workqueue(efx->workqueue); rmb(); /* efx->link_up can be 1 even if the XAUI link is down, * (bug5762). Usually, it's not worth bothering with the * difference, but for selftests, we need that extra * guarantee that the link is really, really, up. */ link_up = efx->link_up; if (!falcon_xaui_link_ok(efx)) link_up = 0; } while ((++count < 20) && !link_up); /* The link should now be up. If it isn't, there is no point * in attempting a loopback test */ if (!link_up) { EFX_ERR(efx, "loopback %s never came up\n", LOOPBACK_MODE(efx)); rc = -EIO; goto out; } EFX_LOG(efx, "link came up in %s loopback in %d iterations\n", LOOPBACK_MODE(efx), count); /* Test every TX queue */ efx_for_each_tx_queue(tx_queue, efx) { state->offload_csum = (tx_queue->queue == EFX_TX_QUEUE_OFFLOAD_CSUM); rc = efx_test_loopback(tx_queue, &tests->loopback[mode]); if (rc) goto out; } } out: /* Take out of loopback and restore PHY settings */ state->flush = true; efx->loopback_mode = old_mode; efx_ethtool_set_settings(efx->net_dev, &ecmd); return rc; } /************************************************************************** * * Entry points * *************************************************************************/ /* Online (i.e. non-disruptive) testing * This checks interrupt generation, event delivery and PHY presence. */ int efx_online_test(struct efx_nic *efx, struct efx_self_tests *tests) { struct efx_channel *channel; int rc; rc = efx_test_interrupts(efx, tests); if (rc) return rc; efx_for_each_channel(channel, efx) { rc = efx_test_eventq_irq(channel, tests); if (rc) return rc; } rc = efx_test_phy(efx, tests); return rc; } /* Offline (i.e. disruptive) testing * This checks MAC and PHY loopback on the specified port. */ int efx_offline_test(struct efx_nic *efx, struct efx_self_tests *tests, unsigned int loopback_modes) { struct efx_selftest_state *state; int rc; /* Create a selftest_state structure to hold state for the test */ state = kzalloc(sizeof(*state), GFP_KERNEL); if (state == NULL) return -ENOMEM; /* Set the port loopback_selftest member. From this point on * all received packets will be dropped. Mark the state as * "flushing" so all inflight packets are dropped */ BUG_ON(efx->loopback_selftest); state->flush = true; efx->loopback_selftest = state; rc = efx_test_loopbacks(efx, tests, loopback_modes); efx->loopback_selftest = NULL; wmb(); kfree(state); return rc; }