drivers/net/ethernet/sfc/selftest.c

   1 /****************************************************************************
   2  * Driver for Solarflare Solarstorm network controllers and boards
   3  * Copyright 2005-2006 Fen Systems Ltd.
   4  * Copyright 2006-2010 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         const char msg[64];
  50 } __packed;
  51
  52 /* Loopback test source MAC address */
  53 static const unsigned char payload_source[ETH_ALEN] = {
  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                 tests->nvram = rc ? -1 : 1;
 118         }
 119
 120         return rc;
 121 }
 122
 123 /**************************************************************************
 124  *
 125  * Interrupt and event queue testing
 126  *
 127  **************************************************************************/
 128
 129 /* Test generation and receipt of interrupts */
 130 static int efx_test_interrupts(struct efx_nic *efx,
 131                                struct efx_self_tests *tests)
 132 {
 133         unsigned long timeout, wait;
 134         int cpu;
 135
 136         netif_dbg(efx, drv, efx->net_dev, "testing interrupts\n");
 137         tests->interrupt = -1;
 138
 139         efx_nic_irq_test_start(efx);
 140         timeout = jiffies + IRQ_TIMEOUT;
 141         wait = 1;
 142
 143         /* Wait for arrival of test interrupt. */
 144         netif_dbg(efx, drv, efx->net_dev, "waiting for test interrupt\n");
 145         do {
 146                 schedule_timeout_uninterruptible(wait);
 147                 cpu = efx_nic_irq_test_irq_cpu(efx);
 148                 if (cpu >= 0)
 149                         goto success;
 150                 wait *= 2;
 151         } while (time_before(jiffies, timeout));
 152
 153         netif_err(efx, drv, efx->net_dev, "timed out waiting for interrupt\n");
 154         return -ETIMEDOUT;
 155
 156  success:
 157         netif_dbg(efx, drv, efx->net_dev, "%s test interrupt seen on CPU%d\n",
 158                   INT_MODE(efx), cpu);
 159         tests->interrupt = 1;
 160         return 0;
 161 }
 162
 163 /* Test generation and receipt of interrupting events */
 164 static int efx_test_eventq_irq(struct efx_nic *efx,
 165                                struct efx_self_tests *tests)
 166 {
 167         struct efx_channel *channel;
 168         unsigned int read_ptr[EFX_MAX_CHANNELS];
 169         unsigned long napi_ran = 0, dma_pend = 0, int_pend = 0;
 170         unsigned long timeout, wait;
 171
 172         BUILD_BUG_ON(EFX_MAX_CHANNELS > BITS_PER_LONG);
 173
 174         efx_for_each_channel(channel, efx) {
 175                 read_ptr[channel->channel] = channel->eventq_read_ptr;
 176                 set_bit(channel->channel, &dma_pend);
 177                 set_bit(channel->channel, &int_pend);
 178                 efx_nic_event_test_start(channel);
 179         }
 180
 181         timeout = jiffies + IRQ_TIMEOUT;
 182         wait = 1;
 183
 184         /* Wait for arrival of interrupts.  NAPI processing may or may
 185          * not complete in time, but we can cope in any case.
 186          */
 187         do {
 188                 schedule_timeout_uninterruptible(wait);
 189
 190                 efx_for_each_channel(channel, efx) {
 191                         napi_disable(&channel->napi_str);
 192                         if (channel->eventq_read_ptr !=
 193                             read_ptr[channel->channel]) {
 194                                 set_bit(channel->channel, &napi_ran);
 195                                 clear_bit(channel->channel, &dma_pend);
 196                                 clear_bit(channel->channel, &int_pend);
 197                         } else {
 198                                 if (efx_nic_event_present(channel))
 199                                         clear_bit(channel->channel, &dma_pend);
 200                                 if (efx_nic_event_test_irq_cpu(channel) >= 0)
 201                                         clear_bit(channel->channel, &int_pend);
 202                         }
 203                         napi_enable(&channel->napi_str);
 204                         efx_nic_eventq_read_ack(channel);
 205                 }
 206
 207                 wait *= 2;
 208         } while ((dma_pend || int_pend) && time_before(jiffies, timeout));
 209
 210         efx_for_each_channel(channel, efx) {
 211                 bool dma_seen = !test_bit(channel->channel, &dma_pend);
 212                 bool int_seen = !test_bit(channel->channel, &int_pend);
 213
 214                 tests->eventq_dma[channel->channel] = dma_seen ? 1 : -1;
 215                 tests->eventq_int[channel->channel] = int_seen ? 1 : -1;
 216
 217                 if (dma_seen && int_seen) {
 218                         netif_dbg(efx, drv, efx->net_dev,
 219                                   "channel %d event queue passed (with%s NAPI)\n",
 220                                   channel->channel,
 221                                   test_bit(channel->channel, &napi_ran) ?
 222                                   "" : "out");
 223                 } else {
 224                         /* Report failure and whether either interrupt or DMA
 225                          * worked
 226                          */
 227                         netif_err(efx, drv, efx->net_dev,
 228                                   "channel %d timed out waiting for event queue\n",
 229                                   channel->channel);
 230                         if (int_seen)
 231                                 netif_err(efx, drv, efx->net_dev,
 232                                           "channel %d saw interrupt "
 233                                           "during event queue test\n",
 234                                           channel->channel);
 235                         if (dma_seen)
 236                                 netif_err(efx, drv, efx->net_dev,
 237                                           "channel %d event was generated, but "
 238                                           "failed to trigger an interrupt\n",
 239                                           channel->channel);
 240                 }
 241         }
 242
 243         return (dma_pend || int_pend) ? -ETIMEDOUT : 0;
 244 }
 245
 246 static int efx_test_phy(struct efx_nic *efx, struct efx_self_tests *tests,
 247                         unsigned flags)
 248 {
 249         int rc;
 250
 251         if (!efx->phy_op->run_tests)
 252                 return 0;
 253
 254         mutex_lock(&efx->mac_lock);
 255         rc = efx->phy_op->run_tests(efx, tests->phy_ext, flags);
 256         mutex_unlock(&efx->mac_lock);
 257         return rc;
 258 }
 259
 260 /**************************************************************************
 261  *
 262  * Loopback testing
 263  * NB Only one loopback test can be executing concurrently.
 264  *
 265  **************************************************************************/
 266
 267 /* Loopback test RX callback
 268  * This is called for each received packet during loopback testing.
 269  */
 270 void efx_loopback_rx_packet(struct efx_nic *efx,
 271                             const char *buf_ptr, int pkt_len)
 272 {
 273         struct efx_loopback_state *state = efx->loopback_selftest;
 274         struct efx_loopback_payload *received;
 275         struct efx_loopback_payload *payload;
 276
 277         BUG_ON(!buf_ptr);
 278
 279         /* If we are just flushing, then drop the packet */
 280         if ((state == NULL) || state->flush)
 281                 return;
 282
 283         payload = &state->payload;
 284
 285         received = (struct efx_loopback_payload *) buf_ptr;
 286         received->ip.saddr = payload->ip.saddr;
 287         if (state->offload_csum)
 288                 received->ip.check = payload->ip.check;
 289
 290         /* Check that header exists */
 291         if (pkt_len < sizeof(received->header)) {
 292                 netif_err(efx, drv, efx->net_dev,
 293                           "saw runt RX packet (length %d) in %s loopback "
 294                           "test\n", pkt_len, LOOPBACK_MODE(efx));
 295                 goto err;
 296         }
 297
 298         /* Check that the ethernet header exists */
 299         if (memcmp(&received->header, &payload->header, ETH_HLEN) != 0) {
 300                 netif_err(efx, drv, efx->net_dev,
 301                           "saw non-loopback RX packet in %s loopback test\n",
 302                           LOOPBACK_MODE(efx));
 303                 goto err;
 304         }
 305
 306         /* Check packet length */
 307         if (pkt_len != sizeof(*payload)) {
 308                 netif_err(efx, drv, efx->net_dev,
 309                           "saw incorrect RX packet length %d (wanted %d) in "
 310                           "%s loopback test\n", pkt_len, (int)sizeof(*payload),
 311                           LOOPBACK_MODE(efx));
 312                 goto err;
 313         }
 314
 315         /* Check that IP header matches */
 316         if (memcmp(&received->ip, &payload->ip, sizeof(payload->ip)) != 0) {
 317                 netif_err(efx, drv, efx->net_dev,
 318                           "saw corrupted IP header in %s loopback test\n",
 319                           LOOPBACK_MODE(efx));
 320                 goto err;
 321         }
 322
 323         /* Check that msg and padding matches */
 324         if (memcmp(&received->msg, &payload->msg, sizeof(received->msg)) != 0) {
 325                 netif_err(efx, drv, efx->net_dev,
 326                           "saw corrupted RX packet in %s loopback test\n",
 327                           LOOPBACK_MODE(efx));
 328                 goto err;
 329         }
 330
 331         /* Check that iteration matches */
 332         if (received->iteration != payload->iteration) {
 333                 netif_err(efx, drv, efx->net_dev,
 334                           "saw RX packet from iteration %d (wanted %d) in "
 335                           "%s loopback test\n", ntohs(received->iteration),
 336                           ntohs(payload->iteration), LOOPBACK_MODE(efx));
 337                 goto err;
 338         }
 339
 340         /* Increase correct RX count */
 341         netif_vdbg(efx, drv, efx->net_dev,
 342                    "got loopback RX in %s loopback test\n", LOOPBACK_MODE(efx));
 343
 344         atomic_inc(&state->rx_good);
 345         return;
 346
 347  err:
 348 #ifdef DEBUG
 349         if (atomic_read(&state->rx_bad) == 0) {
 350                 netif_err(efx, drv, efx->net_dev, "received packet:\n");
 351                 print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 0x10, 1,
 352                                buf_ptr, pkt_len, 0);
 353                 netif_err(efx, drv, efx->net_dev, "expected packet:\n");
 354                 print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 0x10, 1,
 355                                &state->payload, sizeof(state->payload), 0);
 356         }
 357 #endif
 358         atomic_inc(&state->rx_bad);
 359 }
 360
 361 /* Initialise an efx_selftest_state for a new iteration */
 362 static void efx_iterate_state(struct efx_nic *efx)
 363 {
 364         struct efx_loopback_state *state = efx->loopback_selftest;
 365         struct net_device *net_dev = efx->net_dev;
 366         struct efx_loopback_payload *payload = &state->payload;
 367
 368         /* Initialise the layerII header */
 369         memcpy(&payload->header.h_dest, net_dev->dev_addr, ETH_ALEN);
 370         memcpy(&payload->header.h_source, &payload_source, ETH_ALEN);
 371         payload->header.h_proto = htons(ETH_P_IP);
 372
 373         /* saddr set later and used as incrementing count */
 374         payload->ip.daddr = htonl(INADDR_LOOPBACK);
 375         payload->ip.ihl = 5;
 376         payload->ip.check = htons(0xdead);
 377         payload->ip.tot_len = htons(sizeof(*payload) - sizeof(struct ethhdr));
 378         payload->ip.version = IPVERSION;
 379         payload->ip.protocol = IPPROTO_UDP;
 380
 381         /* Initialise udp header */
 382         payload->udp.source = 0;
 383         payload->udp.len = htons(sizeof(*payload) - sizeof(struct ethhdr) -
 384                                  sizeof(struct iphdr));
 385         payload->udp.check = 0; /* checksum ignored */
 386
 387         /* Fill out payload */
 388         payload->iteration = htons(ntohs(payload->iteration) + 1);
 389         memcpy(&payload->msg, payload_msg, sizeof(payload_msg));
 390
 391         /* Fill out remaining state members */
 392         atomic_set(&state->rx_good, 0);
 393         atomic_set(&state->rx_bad, 0);
 394         smp_wmb();
 395 }
 396
 397 static int efx_begin_loopback(struct efx_tx_queue *tx_queue)
 398 {
 399         struct efx_nic *efx = tx_queue->efx;
 400         struct efx_loopback_state *state = efx->loopback_selftest;
 401         struct efx_loopback_payload *payload;
 402         struct sk_buff *skb;
 403         int i;
 404         netdev_tx_t rc;
 405
 406         /* Transmit N copies of buffer */
 407         for (i = 0; i < state->packet_count; i++) {
 408                 /* Allocate an skb, holding an extra reference for
 409                  * transmit completion counting */
 410                 skb = alloc_skb(sizeof(state->payload), GFP_KERNEL);
 411                 if (!skb)
 412                         return -ENOMEM;
 413                 state->skbs[i] = skb;
 414                 skb_get(skb);
 415
 416                 /* Copy the payload in, incrementing the source address to
 417                  * exercise the rss vectors */
 418                 payload = ((struct efx_loopback_payload *)
 419                            skb_put(skb, sizeof(state->payload)));
 420                 memcpy(payload, &state->payload, sizeof(state->payload));
 421                 payload->ip.saddr = htonl(INADDR_LOOPBACK | (i << 2));
 422
 423                 /* Ensure everything we've written is visible to the
 424                  * interrupt handler. */
 425                 smp_wmb();
 426
 427                 netif_tx_lock_bh(efx->net_dev);
 428                 rc = efx_enqueue_skb(tx_queue, skb);
 429                 netif_tx_unlock_bh(efx->net_dev);
 430
 431                 if (rc != NETDEV_TX_OK) {
 432                         netif_err(efx, drv, efx->net_dev,
 433                                   "TX queue %d could not transmit packet %d of "
 434                                   "%d in %s loopback test\n", tx_queue->queue,
 435                                   i + 1, state->packet_count,
 436                                   LOOPBACK_MODE(efx));
 437
 438                         /* Defer cleaning up the other skbs for the caller */
 439                         kfree_skb(skb);
 440                         return -EPIPE;
 441                 }
 442         }
 443
 444         return 0;
 445 }
 446
 447 static int efx_poll_loopback(struct efx_nic *efx)
 448 {
 449         struct efx_loopback_state *state = efx->loopback_selftest;
 450         struct efx_channel *channel;
 451
 452         /* NAPI polling is not enabled, so process channels
 453          * synchronously */
 454         efx_for_each_channel(channel, efx) {
 455                 if (channel->work_pending)
 456                         efx_process_channel_now(channel);
 457         }
 458         return atomic_read(&state->rx_good) == state->packet_count;
 459 }
 460
 461 static int efx_end_loopback(struct efx_tx_queue *tx_queue,
 462                             struct efx_loopback_self_tests *lb_tests)
 463 {
 464         struct efx_nic *efx = tx_queue->efx;
 465         struct efx_loopback_state *state = efx->loopback_selftest;
 466         struct sk_buff *skb;
 467         int tx_done = 0, rx_good, rx_bad;
 468         int i, rc = 0;
 469
 470         netif_tx_lock_bh(efx->net_dev);
 471
 472         /* Count the number of tx completions, and decrement the refcnt. Any
 473          * skbs not already completed will be free'd when the queue is flushed */
 474         for (i = 0; i < state->packet_count; i++) {
 475                 skb = state->skbs[i];
 476                 if (skb && !skb_shared(skb))
 477                         ++tx_done;
 478                 dev_kfree_skb_any(skb);
 479         }
 480
 481         netif_tx_unlock_bh(efx->net_dev);
 482
 483         /* Check TX completion and received packet counts */
 484         rx_good = atomic_read(&state->rx_good);
 485         rx_bad = atomic_read(&state->rx_bad);
 486         if (tx_done != state->packet_count) {
 487                 /* Don't free the skbs; they will be picked up on TX
 488                  * overflow or channel teardown.
 489                  */
 490                 netif_err(efx, drv, efx->net_dev,
 491                           "TX queue %d saw only %d out of an expected %d "
 492                           "TX completion events in %s loopback test\n",
 493                           tx_queue->queue, tx_done, state->packet_count,
 494                           LOOPBACK_MODE(efx));
 495                 rc = -ETIMEDOUT;
 496                 /* Allow to fall through so we see the RX errors as well */
 497         }
 498
 499         /* We may always be up to a flush away from our desired packet total */
 500         if (rx_good != state->packet_count) {
 501                 netif_dbg(efx, drv, efx->net_dev,
 502                           "TX queue %d saw only %d out of an expected %d "
 503                           "received packets in %s loopback test\n",
 504                           tx_queue->queue, rx_good, state->packet_count,
 505                           LOOPBACK_MODE(efx));
 506                 rc = -ETIMEDOUT;
 507                 /* Fall through */
 508         }
 509
 510         /* Update loopback test structure */
 511         lb_tests->tx_sent[tx_queue->queue] += state->packet_count;
 512         lb_tests->tx_done[tx_queue->queue] += tx_done;
 513         lb_tests->rx_good += rx_good;
 514         lb_tests->rx_bad += rx_bad;
 515
 516         return rc;
 517 }
 518
 519 static int
 520 efx_test_loopback(struct efx_tx_queue *tx_queue,
 521                   struct efx_loopback_self_tests *lb_tests)
 522 {
 523         struct efx_nic *efx = tx_queue->efx;
 524         struct efx_loopback_state *state = efx->loopback_selftest;
 525         int i, begin_rc, end_rc;
 526
 527         for (i = 0; i < 3; i++) {
 528                 /* Determine how many packets to send */
 529                 state->packet_count = efx->txq_entries / 3;
 530                 state->packet_count = min(1 << (i << 2), state->packet_count);
 531                 state->skbs = kcalloc(state->packet_count,
 532                                       sizeof(state->skbs[0]), GFP_KERNEL);
 533                 if (!state->skbs)
 534                         return -ENOMEM;
 535                 state->flush = false;
 536
 537                 netif_dbg(efx, drv, efx->net_dev,
 538                           "TX queue %d testing %s loopback with %d packets\n",
 539                           tx_queue->queue, LOOPBACK_MODE(efx),
 540                           state->packet_count);
 541
 542                 efx_iterate_state(efx);
 543                 begin_rc = efx_begin_loopback(tx_queue);
 544
 545                 /* This will normally complete very quickly, but be
 546                  * prepared to wait much longer. */
 547                 msleep(1);
 548                 if (!efx_poll_loopback(efx)) {
 549                         msleep(LOOPBACK_TIMEOUT_MS);
 550                         efx_poll_loopback(efx);
 551                 }
 552
 553                 end_rc = efx_end_loopback(tx_queue, lb_tests);
 554                 kfree(state->skbs);
 555
 556                 if (begin_rc || end_rc) {
 557                         /* Wait a while to ensure there are no packets
 558                          * floating around after a failure. */
 559                         schedule_timeout_uninterruptible(HZ / 10);
 560                         return begin_rc ? begin_rc : end_rc;
 561                 }
 562         }
 563
 564         netif_dbg(efx, drv, efx->net_dev,
 565                   "TX queue %d passed %s loopback test with a burst length "
 566                   "of %d packets\n", tx_queue->queue, LOOPBACK_MODE(efx),
 567                   state->packet_count);
 568
 569         return 0;
 570 }
 571
 572 /* Wait for link up. On Falcon, we would prefer to rely on efx_monitor, but
 573  * any contention on the mac lock (via e.g. efx_mac_mcast_work) causes it
 574  * to delay and retry. Therefore, it's safer to just poll directly. Wait
 575  * for link up and any faults to dissipate. */
 576 static int efx_wait_for_link(struct efx_nic *efx)
 577 {
 578         struct efx_link_state *link_state = &efx->link_state;
 579         int count, link_up_count = 0;
 580         bool link_up;
 581
 582         for (count = 0; count < 40; count++) {
 583                 schedule_timeout_uninterruptible(HZ / 10);
 584
 585                 if (efx->type->monitor != NULL) {
 586                         mutex_lock(&efx->mac_lock);
 587                         efx->type->monitor(efx);
 588                         mutex_unlock(&efx->mac_lock);
 589                 } else {
 590                         struct efx_channel *channel = efx_get_channel(efx, 0);
 591                         if (channel->work_pending)
 592                                 efx_process_channel_now(channel);
 593                 }
 594
 595                 mutex_lock(&efx->mac_lock);
 596                 link_up = link_state->up;
 597                 if (link_up)
 598                         link_up = !efx->type->check_mac_fault(efx);
 599                 mutex_unlock(&efx->mac_lock);
 600
 601                 if (link_up) {
 602                         if (++link_up_count == 2)
 603                                 return 0;
 604                 } else {
 605                         link_up_count = 0;
 606                 }
 607         }
 608
 609         return -ETIMEDOUT;
 610 }
 611
 612 static int efx_test_loopbacks(struct efx_nic *efx, struct efx_self_tests *tests,
 613                               unsigned int loopback_modes)
 614 {
 615         enum efx_loopback_mode mode;
 616         struct efx_loopback_state *state;
 617         struct efx_channel *channel = efx_get_channel(efx, 0);
 618         struct efx_tx_queue *tx_queue;
 619         int rc = 0;
 620
 621         /* Set the port loopback_selftest member. From this point on
 622          * all received packets will be dropped. Mark the state as
 623          * "flushing" so all inflight packets are dropped */
 624         state = kzalloc(sizeof(*state), GFP_KERNEL);
 625         if (state == NULL)
 626                 return -ENOMEM;
 627         BUG_ON(efx->loopback_selftest);
 628         state->flush = true;
 629         efx->loopback_selftest = state;
 630
 631         /* Test all supported loopback modes */
 632         for (mode = LOOPBACK_NONE; mode <= LOOPBACK_TEST_MAX; mode++) {
 633                 if (!(loopback_modes & (1 << mode)))
 634                         continue;
 635
 636                 /* Move the port into the specified loopback mode. */
 637                 state->flush = true;
 638                 mutex_lock(&efx->mac_lock);
 639                 efx->loopback_mode = mode;
 640                 rc = __efx_reconfigure_port(efx);
 641                 mutex_unlock(&efx->mac_lock);
 642                 if (rc) {
 643                         netif_err(efx, drv, efx->net_dev,
 644                                   "unable to move into %s loopback\n",
 645                                   LOOPBACK_MODE(efx));
 646                         goto out;
 647                 }
 648
 649                 rc = efx_wait_for_link(efx);
 650                 if (rc) {
 651                         netif_err(efx, drv, efx->net_dev,
 652                                   "loopback %s never came up\n",
 653                                   LOOPBACK_MODE(efx));
 654                         goto out;
 655                 }
 656
 657                 /* Test all enabled types of TX queue */
 658                 efx_for_each_channel_tx_queue(tx_queue, channel) {
 659                         state->offload_csum = (tx_queue->queue &
 660                                                EFX_TXQ_TYPE_OFFLOAD);
 661                         rc = efx_test_loopback(tx_queue,
 662                                                &tests->loopback[mode]);
 663                         if (rc)
 664                                 goto out;
 665                 }
 666         }
 667
 668  out:
 669         /* Remove the flush. The caller will remove the loopback setting */
 670         state->flush = true;
 671         efx->loopback_selftest = NULL;
 672         wmb();
 673         kfree(state);
 674
 675         return rc;
 676 }
 677
 678 /**************************************************************************
 679  *
 680  * Entry point
 681  *
 682  *************************************************************************/
 683
 684 int efx_selftest(struct efx_nic *efx, struct efx_self_tests *tests,
 685                  unsigned flags)
 686 {
 687         enum efx_loopback_mode loopback_mode = efx->loopback_mode;
 688         int phy_mode = efx->phy_mode;
 689         int rc_test = 0, rc_reset, rc;
 690
 691         efx_selftest_async_cancel(efx);
 692
 693         /* Online (i.e. non-disruptive) testing
 694          * This checks interrupt generation, event delivery and PHY presence. */
 695
 696         rc = efx_test_phy_alive(efx, tests);
 697         if (rc && !rc_test)
 698                 rc_test = rc;
 699
 700         rc = efx_test_nvram(efx, tests);
 701         if (rc && !rc_test)
 702                 rc_test = rc;
 703
 704         rc = efx_test_interrupts(efx, tests);
 705         if (rc && !rc_test)
 706                 rc_test = rc;
 707
 708         rc = efx_test_eventq_irq(efx, tests);
 709         if (rc && !rc_test)
 710                 rc_test = rc;
 711
 712         if (rc_test)
 713                 return rc_test;
 714
 715         if (!(flags & ETH_TEST_FL_OFFLINE))
 716                 return efx_test_phy(efx, tests, flags);
 717
 718         /* Offline (i.e. disruptive) testing
 719          * This checks MAC and PHY loopback on the specified port. */
 720
 721         /* Detach the device so the kernel doesn't transmit during the
 722          * loopback test and the watchdog timeout doesn't fire.
 723          */
 724         efx_device_detach_sync(efx);
 725
 726         if (efx->type->test_chip) {
 727                 rc_reset = efx->type->test_chip(efx, tests);
 728                 if (rc_reset) {
 729                         netif_err(efx, hw, efx->net_dev,
 730                                   "Unable to recover from chip test\n");
 731                         efx_schedule_reset(efx, RESET_TYPE_DISABLE);
 732                         return rc_reset;
 733                 }
 734
 735                 if ((tests->registers < 0) && !rc_test)
 736                         rc_test = -EIO;
 737         }
 738
 739         /* Ensure that the phy is powered and out of loopback
 740          * for the bist and loopback tests */
 741         mutex_lock(&efx->mac_lock);
 742         efx->phy_mode &= ~PHY_MODE_LOW_POWER;
 743         efx->loopback_mode = LOOPBACK_NONE;
 744         __efx_reconfigure_port(efx);
 745         mutex_unlock(&efx->mac_lock);
 746
 747         rc = efx_test_phy(efx, tests, flags);
 748         if (rc && !rc_test)
 749                 rc_test = rc;
 750
 751         rc = efx_test_loopbacks(efx, tests, efx->loopback_modes);
 752         if (rc && !rc_test)
 753                 rc_test = rc;
 754
 755         /* restore the PHY to the previous state */
 756         mutex_lock(&efx->mac_lock);
 757         efx->phy_mode = phy_mode;
 758         efx->loopback_mode = loopback_mode;
 759         __efx_reconfigure_port(efx);
 760         mutex_unlock(&efx->mac_lock);
 761
 762         netif_device_attach(efx->net_dev);
 763
 764         return rc_test;
 765 }
 766
 767 void efx_selftest_async_start(struct efx_nic *efx)
 768 {
 769         struct efx_channel *channel;
 770
 771         efx_for_each_channel(channel, efx)
 772                 efx_nic_event_test_start(channel);
 773         schedule_delayed_work(&efx->selftest_work, IRQ_TIMEOUT);
 774 }
 775
 776 void efx_selftest_async_cancel(struct efx_nic *efx)
 777 {
 778         cancel_delayed_work_sync(&efx->selftest_work);
 779 }
 780
 781 void efx_selftest_async_work(struct work_struct *data)
 782 {
 783         struct efx_nic *efx = container_of(data, struct efx_nic,
 784                                            selftest_work.work);
 785         struct efx_channel *channel;
 786         int cpu;
 787
 788         efx_for_each_channel(channel, efx) {
 789                 cpu = efx_nic_event_test_irq_cpu(channel);
 790                 if (cpu < 0)
 791                         netif_err(efx, ifup, efx->net_dev,
 792                                   "channel %d failed to trigger an interrupt\n",
 793                                   channel->channel);
 794                 else
 795                         netif_dbg(efx, ifup, efx->net_dev,
 796                                   "channel %d triggered interrupt on CPU %d\n",
 797                                   channel->channel, cpu);
 798         }
 799 }