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