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