drivers/net/ethernet/sfc/selftest.c

   1 /****************************************************************************
   2  * Driver for Solarflare network controllers and boards
   3  * Copyright 2005-2006 Fen Systems Ltd.
   4  * Copyright 2006-2012 Solarflare Communications Inc.
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License version 2 as published
   8  * by the Free Software Foundation, incorporated herein by reference.
   9  */
  10
  11 #include <linux/netdevice.h>
  12 #include <linux/module.h>
  13 #include <linux/delay.h>
  14 #include <linux/kernel_stat.h>
  15 #include <linux/pci.h>
  16 #include <linux/ethtool.h>
  17 #include <linux/ip.h>
  18 #include <linux/in.h>
  19 #include <linux/udp.h>
  20 #include <linux/rtnetlink.h>
  21 #include <linux/slab.h>
  22 #include "net_driver.h"
  23 #include "efx.h"
  24 #include "nic.h"
  25 #include "selftest.h"
  26 #include "workarounds.h"
  27
  28 /* IRQ latency can be enormous because:
  29  * - All IRQs may be disabled on a CPU for a *long* time by e.g. a
  30  *   slow serial console or an old IDE driver doing error recovery
  31  * - The PREEMPT_RT patches mostly deal with this, but also allow a
  32  *   tasklet or normal task to be given higher priority than our IRQ
  33  *   threads
  34  * Try to avoid blaming the hardware for this.
  35  */
  36 #define IRQ_TIMEOUT HZ
  37
  38 /*
  39  * Loopback test packet structure
  40  *
  41  * The self-test should stress every RSS vector, and unfortunately
  42  * Falcon only performs RSS on TCP/UDP packets.
  43  */
  44 struct efx_loopback_payload {
  45         struct ethhdr header;
  46         struct iphdr ip;
  47         struct udphdr udp;
  48         __be16 iteration;
  49         char msg[64];
  50 } __packed;
  51
  52 /* Loopback test source MAC address */
  53 static const u8 payload_source[ETH_ALEN] __aligned(2) = {
  54         0x00, 0x0f, 0x53, 0x1b, 0x1b, 0x1b,
  55 };
  56
  57 static const char payload_msg[] =
  58         "Hello world! This is an Efx loopback test in progress!";
  59
  60 /* Interrupt mode names */
  61 static const unsigned int efx_interrupt_mode_max = EFX_INT_MODE_MAX;
  62 static const char *const efx_interrupt_mode_names[] = {
  63         [EFX_INT_MODE_MSIX]   = "MSI-X",
  64         [EFX_INT_MODE_MSI]    = "MSI",
  65         [EFX_INT_MODE_LEGACY] = "legacy",
  66 };
  67 #define INT_MODE(efx) \
  68         STRING_TABLE_LOOKUP(efx->interrupt_mode, efx_interrupt_mode)
  69
  70 /**
  71  * efx_loopback_state - persistent state during a loopback selftest
  72  * @flush:              Drop all packets in efx_loopback_rx_packet
  73  * @packet_count:       Number of packets being used in this test
  74  * @skbs:               An array of skbs transmitted
  75  * @offload_csum:       Checksums are being offloaded
  76  * @rx_good:            RX good packet count
  77  * @rx_bad:             RX bad packet count
  78  * @payload:            Payload used in tests
  79  */
  80 struct efx_loopback_state {
  81         bool flush;
  82         int packet_count;
  83         struct sk_buff **skbs;
  84         bool offload_csum;
  85         atomic_t rx_good;
  86         atomic_t rx_bad;
  87         struct efx_loopback_payload payload;
  88 };
  89
  90 /* How long to wait for all the packets to arrive (in ms) */
  91 #define LOOPBACK_TIMEOUT_MS 1000
  92
  93 /**************************************************************************
  94  *
  95  * MII, NVRAM and register tests
  96  *
  97  **************************************************************************/
  98
  99 static int efx_test_phy_alive(struct efx_nic *efx, struct efx_self_tests *tests)
 100 {
 101         int rc = 0;
 102
 103         if (efx->phy_op->test_alive) {
 104                 rc = efx->phy_op->test_alive(efx);
 105                 tests->phy_alive = rc ? -1 : 1;
 106         }
 107
 108         return rc;
 109 }
 110
 111 static int efx_test_nvram(struct efx_nic *efx, struct efx_self_tests *tests)
 112 {
 113         int rc = 0;
 114
 115         if (efx->type->test_nvram) {
 116                 rc = efx->type->test_nvram(efx);
 117                 if (rc == -EPERM)
 118                         rc = 0;
 119                 else
 120                         tests->nvram = rc ? -1 : 1;
 121         }
 122
 123         return rc;
 124 }
 125
 126 /**************************************************************************
 127  *
 128  * Interrupt and event queue testing
 129  *
 130  **************************************************************************/
 131
 132 /* Test generation and receipt of interrupts */
 133 static int efx_test_interrupts(struct efx_nic *efx,
 134                                struct efx_self_tests *tests)
 135 {
 136         unsigned long timeout, wait;
 137         int cpu;
 138         int rc;
 139
 140         netif_dbg(efx, drv, efx->net_dev, "testing interrupts\n");
 141         tests->interrupt = -1;
 142
 143         rc = efx_nic_irq_test_start(efx);
 144         if (rc == -ENOTSUPP) {
 145                 netif_dbg(efx, drv, efx->net_dev,
 146                           "direct interrupt testing not supported\n");
 147                 tests->interrupt = 0;
 148                 return 0;
 149         }
 150
 151         timeout = jiffies + IRQ_TIMEOUT;
 152         wait = 1;
 153
 154         /* Wait for arrival of test interrupt. */
 155         netif_dbg(efx, drv, efx->net_dev, "waiting for test interrupt\n");
 156         do {
 157                 schedule_timeout_uninterruptible(wait);
 158                 cpu = efx_nic_irq_test_irq_cpu(efx);
 159                 if (cpu >= 0)
 160                         goto success;
 161                 wait *= 2;
 162         } while (time_before(jiffies, timeout));
 163
 164         netif_err(efx, drv, efx->net_dev, "timed out waiting for interrupt\n");
 165         return -ETIMEDOUT;
 166
 167  success:
 168         netif_dbg(efx, drv, efx->net_dev, "%s test interrupt seen on CPU%d\n",
 169                   INT_MODE(efx), cpu);
 170         tests->interrupt = 1;
 171         return 0;
 172 }
 173
 174 /* Test generation and receipt of interrupting events */
 175 static int efx_test_eventq_irq(struct efx_nic *efx,
 176                                struct efx_self_tests *tests)
 177 {
 178         struct efx_channel *channel;
 179         unsigned int read_ptr[EFX_MAX_CHANNELS];
 180         unsigned long napi_ran = 0, dma_pend = 0, int_pend = 0;
 181         unsigned long timeout, wait;
 182
 183         BUILD_BUG_ON(EFX_MAX_CHANNELS > BITS_PER_LONG);
 184
 185         efx_for_each_channel(channel, efx) {
 186                 read_ptr[channel->channel] = channel->eventq_read_ptr;
 187                 set_bit(channel->channel, &dma_pend);
 188                 set_bit(channel->channel, &int_pend);
 189                 efx_nic_event_test_start(channel);
 190         }
 191
 192         timeout = jiffies + IRQ_TIMEOUT;
 193         wait = 1;
 194
 195         /* Wait for arrival of interrupts.  NAPI processing may or may
 196          * not complete in time, but we can cope in any case.
 197          */
 198         do {
 199                 schedule_timeout_uninterruptible(wait);
 200
 201                 efx_for_each_channel(channel, efx) {
 202                         efx_stop_eventq(channel);
 203                         if (channel->eventq_read_ptr !=
 204                             read_ptr[channel->channel]) {
 205                                 set_bit(channel->channel, &napi_ran);
 206                                 clear_bit(channel->channel, &dma_pend);
 207                                 clear_bit(channel->channel, &int_pend);
 208                         } else {
 209                                 if (efx_nic_event_present(channel))
 210                                         clear_bit(channel->channel, &dma_pend);
 211                                 if (efx_nic_event_test_irq_cpu(channel) >= 0)
 212                                         clear_bit(channel->channel, &int_pend);
 213                         }
 214                         efx_start_eventq(channel);
 215                 }
 216
 217                 wait *= 2;
 218         } while ((dma_pend || int_pend) && time_before(jiffies, timeout));
 219
 220         efx_for_each_channel(channel, efx) {
 221                 bool dma_seen = !test_bit(channel->channel, &dma_pend);
 222                 bool int_seen = !test_bit(channel->channel, &int_pend);
 223
 224                 tests->eventq_dma[channel->channel] = dma_seen ? 1 : -1;
 225                 tests->eventq_int[channel->channel] = int_seen ? 1 : -1;
 226
 227                 if (dma_seen && int_seen) {
 228                         netif_dbg(efx, drv, efx->net_dev,
 229                                   "channel %d event queue passed (with%s NAPI)\n",
 230                                   channel->channel,
 231                                   test_bit(channel->channel, &napi_ran) ?
 232                                   "" : "out");
 233                 } else {
 234                         /* Report failure and whether either interrupt or DMA
 235                          * worked
 236                          */
 237                         netif_err(efx, drv, efx->net_dev,
 238                                   "channel %d timed out waiting for event queue\n",
 239                                   channel->channel);
 240                         if (int_seen)
 241                                 netif_err(efx, drv, efx->net_dev,
 242                                           "channel %d saw interrupt "
 243                                           "during event queue test\n",
 244                                           channel->channel);
 245                         if (dma_seen)
 246                                 netif_err(efx, drv, efx->net_dev,
 247                                           "channel %d event was generated, but "
 248                                           "failed to trigger an interrupt\n",
 249                                           channel->channel);
 250                 }
 251         }
 252
 253         return (dma_pend || int_pend) ? -ETIMEDOUT : 0;
 254 }
 255
 256 static int efx_test_phy(struct efx_nic *efx, struct efx_self_tests *tests,
 257                         unsigned flags)
 258 {
 259         int rc;
 260
 261         if (!efx->phy_op->run_tests)
 262                 return 0;
 263
 264         mutex_lock(&efx->mac_lock);
 265         rc = efx->phy_op->run_tests(efx, tests->phy_ext, flags);
 266         mutex_unlock(&efx->mac_lock);
 267         if (rc == -EPERM)
 268                 rc = 0;
 269         else
 270                 netif_info(efx, drv, efx->net_dev,
 271                            "%s phy selftest\n", rc ? "Failed" : "Passed");
 272
 273         return rc;
 274 }
 275
 276 /**************************************************************************
 277  *
 278  * Loopback testing
 279  * NB Only one loopback test can be executing concurrently.
 280  *
 281  **************************************************************************/
 282
 283 /* Loopback test RX callback
 284  * This is called for each received packet during loopback testing.
 285  */
 286 void efx_loopback_rx_packet(struct efx_nic *efx,
 287                             const char *buf_ptr, int pkt_len)
 288 {
 289         struct efx_loopback_state *state = efx->loopback_selftest;
 290         struct efx_loopback_payload *received;
 291         struct efx_loopback_payload *payload;
 292
 293         BUG_ON(!buf_ptr);
 294
 295         /* If we are just flushing, then drop the packet */
 296         if ((state == NULL) || state->flush)
 297                 return;
 298
 299         payload = &state->payload;
 300
 301         received = (struct efx_loopback_payload *) buf_ptr;
 302         received->ip.saddr = payload->ip.saddr;
 303         if (state->offload_csum)
 304                 received->ip.check = payload->ip.check;
 305
 306         /* Check that header exists */
 307         if (pkt_len < sizeof(received->header)) {
 308                 netif_err(efx, drv, efx->net_dev,
 309                           "saw runt RX packet (length %d) in %s loopback "
 310                           "test\n", pkt_len, LOOPBACK_MODE(efx));
 311                 goto err;
 312         }
 313
 314         /* Check that the ethernet header exists */
 315         if (memcmp(&received->header, &payload->header, ETH_HLEN) != 0) {
 316                 netif_err(efx, drv, efx->net_dev,
 317                           "saw non-loopback RX packet in %s loopback test\n",
 318                           LOOPBACK_MODE(efx));
 319                 goto err;
 320         }
 321
 322         /* Check packet length */
 323         if (pkt_len != sizeof(*payload)) {
 324                 netif_err(efx, drv, efx->net_dev,
 325                           "saw incorrect RX packet length %d (wanted %d) in "
 326                           "%s loopback test\n", pkt_len, (int)sizeof(*payload),
 327                           LOOPBACK_MODE(efx));
 328                 goto err;
 329         }
 330
 331         /* Check that IP header matches */
 332         if (memcmp(&received->ip, &payload->ip, sizeof(payload->ip)) != 0) {
 333                 netif_err(efx, drv, efx->net_dev,
 334                           "saw corrupted IP header in %s loopback test\n",
 335                           LOOPBACK_MODE(efx));
 336                 goto err;
 337         }
 338
 339         /* Check that msg and padding matches */
 340         if (memcmp(&received->msg, &payload->msg, sizeof(received->msg)) != 0) {
 341                 netif_err(efx, drv, efx->net_dev,
 342                           "saw corrupted RX packet in %s loopback test\n",
 343                           LOOPBACK_MODE(efx));
 344                 goto err;
 345         }
 346
 347         /* Check that iteration matches */
 348         if (received->iteration != payload->iteration) {
 349                 netif_err(efx, drv, efx->net_dev,
 350                           "saw RX packet from iteration %d (wanted %d) in "
 351                           "%s loopback test\n", ntohs(received->iteration),
 352                           ntohs(payload->iteration), LOOPBACK_MODE(efx));
 353                 goto err;
 354         }
 355
 356         /* Increase correct RX count */
 357         netif_vdbg(efx, drv, efx->net_dev,
 358                    "got loopback RX in %s loopback test\n", LOOPBACK_MODE(efx));
 359
 360         atomic_inc(&state->rx_good);
 361         return;
 362
 363  err:
 364 #ifdef DEBUG
 365         if (atomic_read(&state->rx_bad) == 0) {
 366                 netif_err(efx, drv, efx->net_dev, "received packet:\n");
 367                 print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 0x10, 1,
 368                                buf_ptr, pkt_len, 0);
 369                 netif_err(efx, drv, efx->net_dev, "expected packet:\n");
 370                 print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 0x10, 1,
 371                                &state->payload, sizeof(state->payload), 0);
 372         }
 373 #endif
 374         atomic_inc(&state->rx_bad);
 375 }
 376
 377 /* Initialise an efx_selftest_state for a new iteration */
 378 static void efx_iterate_state(struct efx_nic *efx)
 379 {
 380         struct efx_loopback_state *state = efx->loopback_selftest;
 381         struct net_device *net_dev = efx->net_dev;
 382         struct efx_loopback_payload *payload = &state->payload;
 383
 384         /* Initialise the layerII header */
 385         ether_addr_copy((u8 *)&payload->header.h_dest, net_dev->dev_addr);
 386         ether_addr_copy((u8 *)&payload->header.h_source, payload_source);
 387         payload->header.h_proto = htons(ETH_P_IP);
 388
 389         /* saddr set later and used as incrementing count */
 390         payload->ip.daddr = htonl(INADDR_LOOPBACK);
 391         payload->ip.ihl = 5;
 392         payload->ip.check = (__force __sum16) htons(0xdead);
 393         payload->ip.tot_len = htons(sizeof(*payload) - sizeof(struct ethhdr));
 394         payload->ip.version = IPVERSION;
 395         payload->ip.protocol = IPPROTO_UDP;
 396
 397         /* Initialise udp header */
 398         payload->udp.source = 0;
 399         payload->udp.len = htons(sizeof(*payload) - sizeof(struct ethhdr) -
 400                                  sizeof(struct iphdr));
 401         payload->udp.check = 0; /* checksum ignored */
 402
 403         /* Fill out payload */
 404         payload->iteration = htons(ntohs(payload->iteration) + 1);
 405         memcpy(&payload->msg, payload_msg, sizeof(payload_msg));
 406
 407         /* Fill out remaining state members */
 408         atomic_set(&state->rx_good, 0);
 409         atomic_set(&state->rx_bad, 0);
 410         smp_wmb();
 411 }
 412
 413 static int efx_begin_loopback(struct efx_tx_queue *tx_queue)
 414 {
 415         struct efx_nic *efx = tx_queue->efx;
 416         struct efx_loopback_state *state = efx->loopback_selftest;
 417         struct efx_loopback_payload *payload;
 418         struct sk_buff *skb;
 419         int i;
 420         netdev_tx_t rc;
 421
 422         /* Transmit N copies of buffer */
 423         for (i = 0; i < state->packet_count; i++) {
 424                 /* Allocate an skb, holding an extra reference for
 425                  * transmit completion counting */
 426                 skb = alloc_skb(sizeof(state->payload), GFP_KERNEL);
 427                 if (!skb)
 428                         return -ENOMEM;
 429                 state->skbs[i] = skb;
 430                 skb_get(skb);
 431
 432                 /* Copy the payload in, incrementing the source address to
 433                  * exercise the rss vectors */
 434                 payload = skb_put(skb, sizeof(state->payload));
 435                 memcpy(payload, &state->payload, sizeof(state->payload));
 436                 payload->ip.saddr = htonl(INADDR_LOOPBACK | (i << 2));
 437
 438                 /* Ensure everything we've written is visible to the
 439                  * interrupt handler. */
 440                 smp_wmb();
 441
 442                 netif_tx_lock_bh(efx->net_dev);
 443                 rc = efx_enqueue_skb(tx_queue, skb);
 444                 netif_tx_unlock_bh(efx->net_dev);
 445
 446                 if (rc != NETDEV_TX_OK) {
 447                         netif_err(efx, drv, efx->net_dev,
 448                                   "TX queue %d could not transmit packet %d of "
 449                                   "%d in %s loopback test\n", tx_queue->queue,
 450                                   i + 1, state->packet_count,
 451                                   LOOPBACK_MODE(efx));
 452
 453                         /* Defer cleaning up the other skbs for the caller */
 454                         kfree_skb(skb);
 455                         return -EPIPE;
 456                 }
 457         }
 458
 459         return 0;
 460 }
 461
 462 static int efx_poll_loopback(struct efx_nic *efx)
 463 {
 464         struct efx_loopback_state *state = efx->loopback_selftest;
 465
 466         return atomic_read(&state->rx_good) == state->packet_count;
 467 }
 468
 469 static int efx_end_loopback(struct efx_tx_queue *tx_queue,
 470                             struct efx_loopback_self_tests *lb_tests)
 471 {
 472         struct efx_nic *efx = tx_queue->efx;
 473         struct efx_loopback_state *state = efx->loopback_selftest;
 474         struct sk_buff *skb;
 475         int tx_done = 0, rx_good, rx_bad;
 476         int i, rc = 0;
 477
 478         netif_tx_lock_bh(efx->net_dev);
 479
 480         /* Count the number of tx completions, and decrement the refcnt. Any
 481          * skbs not already completed will be free'd when the queue is flushed */
 482         for (i = 0; i < state->packet_count; i++) {
 483                 skb = state->skbs[i];
 484                 if (skb && !skb_shared(skb))
 485                         ++tx_done;
 486                 dev_kfree_skb(skb);
 487         }
 488
 489         netif_tx_unlock_bh(efx->net_dev);
 490
 491         /* Check TX completion and received packet counts */
 492         rx_good = atomic_read(&state->rx_good);
 493         rx_bad = atomic_read(&state->rx_bad);
 494         if (tx_done != state->packet_count) {
 495                 /* Don't free the skbs; they will be picked up on TX
 496                  * overflow or channel teardown.
 497                  */
 498                 netif_err(efx, drv, efx->net_dev,
 499                           "TX queue %d saw only %d out of an expected %d "
 500                           "TX completion events in %s loopback test\n",
 501                           tx_queue->queue, tx_done, state->packet_count,
 502                           LOOPBACK_MODE(efx));
 503                 rc = -ETIMEDOUT;
 504                 /* Allow to fall through so we see the RX errors as well */
 505         }
 506
 507         /* We may always be up to a flush away from our desired packet total */
 508         if (rx_good != state->packet_count) {
 509                 netif_dbg(efx, drv, efx->net_dev,
 510                           "TX queue %d saw only %d out of an expected %d "
 511                           "received packets in %s loopback test\n",
 512                           tx_queue->queue, rx_good, state->packet_count,
 513                           LOOPBACK_MODE(efx));
 514                 rc = -ETIMEDOUT;
 515                 /* Fall through */
 516         }
 517
 518         /* Update loopback test structure */
 519         lb_tests->tx_sent[tx_queue->queue] += state->packet_count;
 520         lb_tests->tx_done[tx_queue->queue] += tx_done;
 521         lb_tests->rx_good += rx_good;
 522         lb_tests->rx_bad += rx_bad;
 523
 524         return rc;
 525 }
 526
 527 static int
 528 efx_test_loopback(struct efx_tx_queue *tx_queue,
 529                   struct efx_loopback_self_tests *lb_tests)
 530 {
 531         struct efx_nic *efx = tx_queue->efx;
 532         struct efx_loopback_state *state = efx->loopback_selftest;
 533         int i, begin_rc, end_rc;
 534
 535         for (i = 0; i < 3; i++) {
 536                 /* Determine how many packets to send */
 537                 state->packet_count = efx->txq_entries / 3;
 538                 state->packet_count = min(1 << (i << 2), state->packet_count);
 539                 state->skbs = kcalloc(state->packet_count,
 540                                       sizeof(state->skbs[0]), GFP_KERNEL);
 541                 if (!state->skbs)
 542                         return -ENOMEM;
 543                 state->flush = false;
 544
 545                 netif_dbg(efx, drv, efx->net_dev,
 546                           "TX queue %d testing %s loopback with %d packets\n",
 547                           tx_queue->queue, LOOPBACK_MODE(efx),
 548                           state->packet_count);
 549
 550                 efx_iterate_state(efx);
 551                 begin_rc = efx_begin_loopback(tx_queue);
 552
 553                 /* This will normally complete very quickly, but be
 554                  * prepared to wait much longer. */
 555                 msleep(1);
 556                 if (!efx_poll_loopback(efx)) {
 557                         msleep(LOOPBACK_TIMEOUT_MS);
 558                         efx_poll_loopback(efx);
 559                 }
 560
 561                 end_rc = efx_end_loopback(tx_queue, lb_tests);
 562                 kfree(state->skbs);
 563
 564                 if (begin_rc || end_rc) {
 565                         /* Wait a while to ensure there are no packets
 566                          * floating around after a failure. */
 567                         schedule_timeout_uninterruptible(HZ / 10);
 568                         return begin_rc ? begin_rc : end_rc;
 569                 }
 570         }
 571
 572         netif_dbg(efx, drv, efx->net_dev,
 573                   "TX queue %d passed %s loopback test with a burst length "
 574                   "of %d packets\n", tx_queue->queue, LOOPBACK_MODE(efx),
 575                   state->packet_count);
 576
 577         return 0;
 578 }
 579
 580 /* Wait for link up. On Falcon, we would prefer to rely on efx_monitor, but
 581  * any contention on the mac lock (via e.g. efx_mac_mcast_work) causes it
 582  * to delay and retry. Therefore, it's safer to just poll directly. Wait
 583  * for link up and any faults to dissipate. */
 584 static int efx_wait_for_link(struct efx_nic *efx)
 585 {
 586         struct efx_link_state *link_state = &efx->link_state;
 587         int count, link_up_count = 0;
 588         bool link_up;
 589
 590         for (count = 0; count < 40; count++) {
 591                 schedule_timeout_uninterruptible(HZ / 10);
 592
 593                 if (efx->type->monitor != NULL) {
 594                         mutex_lock(&efx->mac_lock);
 595                         efx->type->monitor(efx);
 596                         mutex_unlock(&efx->mac_lock);
 597                 }
 598
 599                 mutex_lock(&efx->mac_lock);
 600                 link_up = link_state->up;
 601                 if (link_up)
 602                         link_up = !efx->type->check_mac_fault(efx);
 603                 mutex_unlock(&efx->mac_lock);
 604
 605                 if (link_up) {
 606                         if (++link_up_count == 2)
 607                                 return 0;
 608                 } else {
 609                         link_up_count = 0;
 610                 }
 611         }
 612
 613         return -ETIMEDOUT;
 614 }
 615
 616 static int efx_test_loopbacks(struct efx_nic *efx, struct efx_self_tests *tests,
 617                               unsigned int loopback_modes)
 618 {
 619         enum efx_loopback_mode mode;
 620         struct efx_loopback_state *state;
 621         struct efx_channel *channel =
 622                 efx_get_channel(efx, efx->tx_channel_offset);
 623         struct efx_tx_queue *tx_queue;
 624         int rc = 0;
 625
 626         /* Set the port loopback_selftest member. From this point on
 627          * all received packets will be dropped. Mark the state as
 628          * "flushing" so all inflight packets are dropped */
 629         state = kzalloc(sizeof(*state), GFP_KERNEL);
 630         if (state == NULL)
 631                 return -ENOMEM;
 632         BUG_ON(efx->loopback_selftest);
 633         state->flush = true;
 634         efx->loopback_selftest = state;
 635
 636         /* Test all supported loopback modes */
 637         for (mode = LOOPBACK_NONE; mode <= LOOPBACK_TEST_MAX; mode++) {
 638                 if (!(loopback_modes & (1 << mode)))
 639                         continue;
 640
 641                 /* Move the port into the specified loopback mode. */
 642                 state->flush = true;
 643                 mutex_lock(&efx->mac_lock);
 644                 efx->loopback_mode = mode;
 645                 rc = __efx_reconfigure_port(efx);
 646                 mutex_unlock(&efx->mac_lock);
 647                 if (rc) {
 648                         netif_err(efx, drv, efx->net_dev,
 649                                   "unable to move into %s loopback\n",
 650                                   LOOPBACK_MODE(efx));
 651                         goto out;
 652                 }
 653
 654                 rc = efx_wait_for_link(efx);
 655                 if (rc) {
 656                         netif_err(efx, drv, efx->net_dev,
 657                                   "loopback %s never came up\n",
 658                                   LOOPBACK_MODE(efx));
 659                         goto out;
 660                 }
 661
 662                 /* Test all enabled types of TX queue */
 663                 efx_for_each_channel_tx_queue(tx_queue, channel) {
 664                         state->offload_csum = (tx_queue->queue &
 665                                                EFX_TXQ_TYPE_OFFLOAD);
 666                         rc = efx_test_loopback(tx_queue,
 667                                                &tests->loopback[mode]);
 668                         if (rc)
 669                                 goto out;
 670                 }
 671         }
 672
 673  out:
 674         /* Remove the flush. The caller will remove the loopback setting */
 675         state->flush = true;
 676         efx->loopback_selftest = NULL;
 677         wmb();
 678         kfree(state);
 679
 680         if (rc == -EPERM)
 681                 rc = 0;
 682
 683         return rc;
 684 }
 685
 686 /**************************************************************************
 687  *
 688  * Entry point
 689  *
 690  *************************************************************************/
 691
 692 int efx_selftest(struct efx_nic *efx, struct efx_self_tests *tests,
 693                  unsigned flags)
 694 {
 695         enum efx_loopback_mode loopback_mode = efx->loopback_mode;
 696         int phy_mode = efx->phy_mode;
 697         int rc_test = 0, rc_reset, rc;
 698
 699         efx_selftest_async_cancel(efx);
 700
 701         /* Online (i.e. non-disruptive) testing
 702          * This checks interrupt generation, event delivery and PHY presence. */
 703
 704         rc = efx_test_phy_alive(efx, tests);
 705         if (rc && !rc_test)
 706                 rc_test = rc;
 707
 708         rc = efx_test_nvram(efx, tests);
 709         if (rc && !rc_test)
 710                 rc_test = rc;
 711
 712         rc = efx_test_interrupts(efx, tests);
 713         if (rc && !rc_test)
 714                 rc_test = rc;
 715
 716         rc = efx_test_eventq_irq(efx, tests);
 717         if (rc && !rc_test)
 718                 rc_test = rc;
 719
 720         if (rc_test)
 721                 return rc_test;
 722
 723         if (!(flags & ETH_TEST_FL_OFFLINE))
 724                 return efx_test_phy(efx, tests, flags);
 725
 726         /* Offline (i.e. disruptive) testing
 727          * This checks MAC and PHY loopback on the specified port. */
 728
 729         /* Detach the device so the kernel doesn't transmit during the
 730          * loopback test and the watchdog timeout doesn't fire.
 731          */
 732         efx_device_detach_sync(efx);
 733
 734         if (efx->type->test_chip) {
 735                 rc_reset = efx->type->test_chip(efx, tests);
 736                 if (rc_reset) {
 737                         netif_err(efx, hw, efx->net_dev,
 738                                   "Unable to recover from chip test\n");
 739                         efx_schedule_reset(efx, RESET_TYPE_DISABLE);
 740                         return rc_reset;
 741                 }
 742
 743                 if ((tests->memory < 0 || tests->registers < 0) && !rc_test)
 744                         rc_test = -EIO;
 745         }
 746
 747         /* Ensure that the phy is powered and out of loopback
 748          * for the bist and loopback tests */
 749         mutex_lock(&efx->mac_lock);
 750         efx->phy_mode &= ~PHY_MODE_LOW_POWER;
 751         efx->loopback_mode = LOOPBACK_NONE;
 752         __efx_reconfigure_port(efx);
 753         mutex_unlock(&efx->mac_lock);
 754
 755         rc = efx_test_phy(efx, tests, flags);
 756         if (rc && !rc_test)
 757                 rc_test = rc;
 758
 759         rc = efx_test_loopbacks(efx, tests, efx->loopback_modes);
 760         if (rc && !rc_test)
 761                 rc_test = rc;
 762
 763         /* restore the PHY to the previous state */
 764         mutex_lock(&efx->mac_lock);
 765         efx->phy_mode = phy_mode;
 766         efx->loopback_mode = loopback_mode;
 767         __efx_reconfigure_port(efx);
 768         mutex_unlock(&efx->mac_lock);
 769
 770         efx_device_attach_if_not_resetting(efx);
 771
 772         return rc_test;
 773 }
 774
 775 void efx_selftest_async_start(struct efx_nic *efx)
 776 {
 777         struct efx_channel *channel;
 778
 779         efx_for_each_channel(channel, efx)
 780                 efx_nic_event_test_start(channel);
 781         schedule_delayed_work(&efx->selftest_work, IRQ_TIMEOUT);
 782 }
 783
 784 void efx_selftest_async_cancel(struct efx_nic *efx)
 785 {
 786         cancel_delayed_work_sync(&efx->selftest_work);
 787 }
 788
 789 void efx_selftest_async_work(struct work_struct *data)
 790 {
 791         struct efx_nic *efx = container_of(data, struct efx_nic,
 792                                            selftest_work.work);
 793         struct efx_channel *channel;
 794         int cpu;
 795
 796         efx_for_each_channel(channel, efx) {
 797                 cpu = efx_nic_event_test_irq_cpu(channel);
 798                 if (cpu < 0)
 799                         netif_err(efx, ifup, efx->net_dev,
 800                                   "channel %d failed to trigger an interrupt\n",
 801                                   channel->channel);
 802                 else
 803                         netif_dbg(efx, ifup, efx->net_dev,
 804                                   "channel %d triggered interrupt on CPU %d\n",
 805                                   channel->channel, cpu);
 806         }
 807 }