root/drivers/net/ethernet/sfc/selftest.c

DEFINITIONS

1. efx_test_phy_alive
2. efx_test_nvram
3. efx_test_interrupts
4. efx_test_eventq_irq
5. efx_test_phy
6. efx_loopback_rx_packet
7. efx_iterate_state
8. efx_begin_loopback
9. efx_poll_loopback
10. efx_end_loopback
11. efx_test_loopback
12. efx_wait_for_link
13. efx_test_loopbacks
14. efx_selftest
15. efx_selftest_async_start
16. efx_selftest_async_cancel
17. efx_selftest_async_work

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /****************************************************************************
   3  * Driver for Solarflare network controllers and boards
   4  * Copyright 2005-2006 Fen Systems Ltd.
   5  * Copyright 2006-2012 Solarflare Communications Inc.
   6  */
   7 
   8 #include <linux/netdevice.h>
   9 #include <linux/module.h>
  10 #include <linux/delay.h>
  11 #include <linux/kernel_stat.h>
  12 #include <linux/pci.h>
  13 #include <linux/ethtool.h>
  14 #include <linux/ip.h>
  15 #include <linux/in.h>
  16 #include <linux/udp.h>
  17 #include <linux/rtnetlink.h>
  18 #include <linux/slab.h>
  19 #include "net_driver.h"
  20 #include "efx.h"
  21 #include "nic.h"
  22 #include "selftest.h"
  23 #include "workarounds.h"
  24 
  25 /* IRQ latency can be enormous because:
  26  * - All IRQs may be disabled on a CPU for a *long* time by e.g. a
  27  *   slow serial console or an old IDE driver doing error recovery
  28  * - The PREEMPT_RT patches mostly deal with this, but also allow a
  29  *   tasklet or normal task to be given higher priority than our IRQ
  30  *   threads
  31  * Try to avoid blaming the hardware for this.
  32  */
  33 #define IRQ_TIMEOUT HZ
  34 
  35 /*
  36  * Loopback test packet structure
  37  *
  38  * The self-test should stress every RSS vector, and unfortunately
  39  * Falcon only performs RSS on TCP/UDP packets.
  40  */
  41 struct efx_loopback_payload {
  42         struct ethhdr header;
  43         struct iphdr ip;
  44         struct udphdr udp;
  45         __be16 iteration;
  46         char msg[64];
  47 } __packed;
  48 
  49 /* Loopback test source MAC address */
  50 static const u8 payload_source[ETH_ALEN] __aligned(2) = {
  51         0x00, 0x0f, 0x53, 0x1b, 0x1b, 0x1b,
  52 };
  53 
  54 static const char payload_msg[] =
  55         "Hello world! This is an Efx loopback test in progress!";
  56 
  57 /* Interrupt mode names */
  58 static const unsigned int efx_interrupt_mode_max = EFX_INT_MODE_MAX;
  59 static const char *const efx_interrupt_mode_names[] = {
  60         [EFX_INT_MODE_MSIX]   = "MSI-X",
  61         [EFX_INT_MODE_MSI]    = "MSI",
  62         [EFX_INT_MODE_LEGACY] = "legacy",
  63 };
  64 #define INT_MODE(efx) \
  65         STRING_TABLE_LOOKUP(efx->interrupt_mode, efx_interrupt_mode)
  66 
  67 /**
  68  * efx_loopback_state - persistent state during a loopback selftest
  69  * @flush:              Drop all packets in efx_loopback_rx_packet
  70  * @packet_count:       Number of packets being used in this test
  71  * @skbs:               An array of skbs transmitted
  72  * @offload_csum:       Checksums are being offloaded
  73  * @rx_good:            RX good packet count
  74  * @rx_bad:             RX bad packet count
  75  * @payload:            Payload used in tests
  76  */
  77 struct efx_loopback_state {
  78         bool flush;
  79         int packet_count;
  80         struct sk_buff **skbs;
  81         bool offload_csum;
  82         atomic_t rx_good;
  83         atomic_t rx_bad;
  84         struct efx_loopback_payload payload;
  85 };
  86 
  87 /* How long to wait for all the packets to arrive (in ms) */
  88 #define LOOPBACK_TIMEOUT_MS 1000
  89 
  90 /**************************************************************************
  91  *
  92  * MII, NVRAM and register tests
  93  *
  94  **************************************************************************/
  95 
  96 static int efx_test_phy_alive(struct efx_nic *efx, struct efx_self_tests *tests)
  97 {
  98         int rc = 0;
  99 
 100         if (efx->phy_op->test_alive) {
 101                 rc = efx->phy_op->test_alive(efx);
 102                 tests->phy_alive = rc ? -1 : 1;
 103         }
 104 
 105         return rc;
 106 }
 107 
 108 static int efx_test_nvram(struct efx_nic *efx, struct efx_self_tests *tests)
 109 {
 110         int rc = 0;
 111 
 112         if (efx->type->test_nvram) {
 113                 rc = efx->type->test_nvram(efx);
 114                 if (rc == -EPERM)
 115                         rc = 0;
 116                 else
 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         int rc;
 136 
 137         netif_dbg(efx, drv, efx->net_dev, "testing interrupts\n");
 138         tests->interrupt = -1;
 139 
 140         rc = efx_nic_irq_test_start(efx);
 141         if (rc == -ENOTSUPP) {
 142                 netif_dbg(efx, drv, efx->net_dev,
 143                           "direct interrupt testing not supported\n");
 144                 tests->interrupt = 0;
 145                 return 0;
 146         }
 147 
 148         timeout = jiffies + IRQ_TIMEOUT;
 149         wait = 1;
 150 
 151         /* Wait for arrival of test interrupt. */
 152         netif_dbg(efx, drv, efx->net_dev, "waiting for test interrupt\n");
 153         do {
 154                 schedule_timeout_uninterruptible(wait);
 155                 cpu = efx_nic_irq_test_irq_cpu(efx);
 156                 if (cpu >= 0)
 157                         goto success;
 158                 wait *= 2;
 159         } while (time_before(jiffies, timeout));
 160 
 161         netif_err(efx, drv, efx->net_dev, "timed out waiting for interrupt\n");
 162         return -ETIMEDOUT;
 163 
 164  success:
 165         netif_dbg(efx, drv, efx->net_dev, "%s test interrupt seen on CPU%d\n",
 166                   INT_MODE(efx), cpu);
 167         tests->interrupt = 1;
 168         return 0;
 169 }
 170 
 171 /* Test generation and receipt of interrupting events */
 172 static int efx_test_eventq_irq(struct efx_nic *efx,
 173                                struct efx_self_tests *tests)
 174 {
 175         struct efx_channel *channel;
 176         unsigned int read_ptr[EFX_MAX_CHANNELS];
 177         unsigned long napi_ran = 0, dma_pend = 0, int_pend = 0;
 178         unsigned long timeout, wait;
 179 
 180         BUILD_BUG_ON(EFX_MAX_CHANNELS > BITS_PER_LONG);
 181 
 182         efx_for_each_channel(channel, efx) {
 183                 read_ptr[channel->channel] = channel->eventq_read_ptr;
 184                 set_bit(channel->channel, &dma_pend);
 185                 set_bit(channel->channel, &int_pend);
 186                 efx_nic_event_test_start(channel);
 187         }
 188 
 189         timeout = jiffies + IRQ_TIMEOUT;
 190         wait = 1;
 191 
 192         /* Wait for arrival of interrupts.  NAPI processing may or may
 193          * not complete in time, but we can cope in any case.
 194          */
 195         do {
 196                 schedule_timeout_uninterruptible(wait);
 197 
 198                 efx_for_each_channel(channel, efx) {
 199                         efx_stop_eventq(channel);
 200                         if (channel->eventq_read_ptr !=
 201                             read_ptr[channel->channel]) {
 202                                 set_bit(channel->channel, &napi_ran);
 203                                 clear_bit(channel->channel, &dma_pend);
 204                                 clear_bit(channel->channel, &int_pend);
 205                         } else {
 206                                 if (efx_nic_event_present(channel))
 207                                         clear_bit(channel->channel, &dma_pend);
 208                                 if (efx_nic_event_test_irq_cpu(channel) >= 0)
 209                                         clear_bit(channel->channel, &int_pend);
 210                         }
 211                         efx_start_eventq(channel);
 212                 }
 213 
 214                 wait *= 2;
 215         } while ((dma_pend || int_pend) && time_before(jiffies, timeout));
 216 
 217         efx_for_each_channel(channel, efx) {
 218                 bool dma_seen = !test_bit(channel->channel, &dma_pend);
 219                 bool int_seen = !test_bit(channel->channel, &int_pend);
 220 
 221                 tests->eventq_dma[channel->channel] = dma_seen ? 1 : -1;
 222                 tests->eventq_int[channel->channel] = int_seen ? 1 : -1;
 223 
 224                 if (dma_seen && int_seen) {
 225                         netif_dbg(efx, drv, efx->net_dev,
 226                                   "channel %d event queue passed (with%s NAPI)\n",
 227                                   channel->channel,
 228                                   test_bit(channel->channel, &napi_ran) ?
 229                                   "" : "out");
 230                 } else {
 231                         /* Report failure and whether either interrupt or DMA
 232                          * worked
 233                          */
 234                         netif_err(efx, drv, efx->net_dev,
 235                                   "channel %d timed out waiting for event queue\n",
 236                                   channel->channel);
 237                         if (int_seen)
 238                                 netif_err(efx, drv, efx->net_dev,
 239                                           "channel %d saw interrupt "
 240                                           "during event queue test\n",
 241                                           channel->channel);
 242                         if (dma_seen)
 243                                 netif_err(efx, drv, efx->net_dev,
 244                                           "channel %d event was generated, but "
 245                                           "failed to trigger an interrupt\n",
 246                                           channel->channel);
 247                 }
 248         }
 249 
 250         return (dma_pend || int_pend) ? -ETIMEDOUT : 0;
 251 }
 252 
 253 static int efx_test_phy(struct efx_nic *efx, struct efx_self_tests *tests,
 254                         unsigned flags)
 255 {
 256         int rc;
 257 
 258         if (!efx->phy_op->run_tests)
 259                 return 0;
 260 
 261         mutex_lock(&efx->mac_lock);
 262         rc = efx->phy_op->run_tests(efx, tests->phy_ext, flags);
 263         mutex_unlock(&efx->mac_lock);
 264         if (rc == -EPERM)
 265                 rc = 0;
 266         else
 267                 netif_info(efx, drv, efx->net_dev,
 268                            "%s phy selftest\n", rc ? "Failed" : "Passed");
 269 
 270         return rc;
 271 }
 272 
 273 /**************************************************************************
 274  *
 275  * Loopback testing
 276  * NB Only one loopback test can be executing concurrently.
 277  *
 278  **************************************************************************/
 279 
 280 /* Loopback test RX callback
 281  * This is called for each received packet during loopback testing.
 282  */
 283 void efx_loopback_rx_packet(struct efx_nic *efx,
 284                             const char *buf_ptr, int pkt_len)
 285 {
 286         struct efx_loopback_state *state = efx->loopback_selftest;
 287         struct efx_loopback_payload *received;
 288         struct efx_loopback_payload *payload;
 289 
 290         BUG_ON(!buf_ptr);
 291 
 292         /* If we are just flushing, then drop the packet */
 293         if ((state == NULL) || state->flush)
 294                 return;
 295 
 296         payload = &state->payload;
 297 
 298         received = (struct efx_loopback_payload *) buf_ptr;
 299         received->ip.saddr = payload->ip.saddr;
 300         if (state->offload_csum)
 301                 received->ip.check = payload->ip.check;
 302 
 303         /* Check that header exists */
 304         if (pkt_len < sizeof(received->header)) {
 305                 netif_err(efx, drv, efx->net_dev,
 306                           "saw runt RX packet (length %d) in %s loopback "
 307                           "test\n", pkt_len, LOOPBACK_MODE(efx));
 308                 goto err;
 309         }
 310 
 311         /* Check that the ethernet header exists */
 312         if (memcmp(&received->header, &payload->header, ETH_HLEN) != 0) {
 313                 netif_err(efx, drv, efx->net_dev,
 314                           "saw non-loopback RX packet in %s loopback test\n",
 315                           LOOPBACK_MODE(efx));
 316                 goto err;
 317         }
 318 
 319         /* Check packet length */
 320         if (pkt_len != sizeof(*payload)) {
 321                 netif_err(efx, drv, efx->net_dev,
 322                           "saw incorrect RX packet length %d (wanted %d) in "
 323                           "%s loopback test\n", pkt_len, (int)sizeof(*payload),
 324                           LOOPBACK_MODE(efx));
 325                 goto err;
 326         }
 327 
 328         /* Check that IP header matches */
 329         if (memcmp(&received->ip, &payload->ip, sizeof(payload->ip)) != 0) {
 330                 netif_err(efx, drv, efx->net_dev,
 331                           "saw corrupted IP header in %s loopback test\n",
 332                           LOOPBACK_MODE(efx));
 333                 goto err;
 334         }
 335 
 336         /* Check that msg and padding matches */
 337         if (memcmp(&received->msg, &payload->msg, sizeof(received->msg)) != 0) {
 338                 netif_err(efx, drv, efx->net_dev,
 339                           "saw corrupted RX packet in %s loopback test\n",
 340                           LOOPBACK_MODE(efx));
 341                 goto err;
 342         }
 343 
 344         /* Check that iteration matches */
 345         if (received->iteration != payload->iteration) {
 346                 netif_err(efx, drv, efx->net_dev,
 347                           "saw RX packet from iteration %d (wanted %d) in "
 348                           "%s loopback test\n", ntohs(received->iteration),
 349                           ntohs(payload->iteration), LOOPBACK_MODE(efx));
 350                 goto err;
 351         }
 352 
 353         /* Increase correct RX count */
 354         netif_vdbg(efx, drv, efx->net_dev,
 355                    "got loopback RX in %s loopback test\n", LOOPBACK_MODE(efx));
 356 
 357         atomic_inc(&state->rx_good);
 358         return;
 359 
 360  err:
 361 #ifdef DEBUG
 362         if (atomic_read(&state->rx_bad) == 0) {
 363                 netif_err(efx, drv, efx->net_dev, "received packet:\n");
 364                 print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 0x10, 1,
 365                                buf_ptr, pkt_len, 0);
 366                 netif_err(efx, drv, efx->net_dev, "expected packet:\n");
 367                 print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 0x10, 1,
 368                                &state->payload, sizeof(state->payload), 0);
 369         }
 370 #endif
 371         atomic_inc(&state->rx_bad);
 372 }
 373 
 374 /* Initialise an efx_selftest_state for a new iteration */
 375 static void efx_iterate_state(struct efx_nic *efx)
 376 {
 377         struct efx_loopback_state *state = efx->loopback_selftest;
 378         struct net_device *net_dev = efx->net_dev;
 379         struct efx_loopback_payload *payload = &state->payload;
 380 
 381         /* Initialise the layerII header */
 382         ether_addr_copy((u8 *)&payload->header.h_dest, net_dev->dev_addr);
 383         ether_addr_copy((u8 *)&payload->header.h_source, payload_source);
 384         payload->header.h_proto = htons(ETH_P_IP);
 385 
 386         /* saddr set later and used as incrementing count */
 387         payload->ip.daddr = htonl(INADDR_LOOPBACK);
 388         payload->ip.ihl = 5;
 389         payload->ip.check = (__force __sum16) htons(0xdead);
 390         payload->ip.tot_len = htons(sizeof(*payload) - sizeof(struct ethhdr));
 391         payload->ip.version = IPVERSION;
 392         payload->ip.protocol = IPPROTO_UDP;
 393 
 394         /* Initialise udp header */
 395         payload->udp.source = 0;
 396         payload->udp.len = htons(sizeof(*payload) - sizeof(struct ethhdr) -
 397                                  sizeof(struct iphdr));
 398         payload->udp.check = 0; /* checksum ignored */
 399 
 400         /* Fill out payload */
 401         payload->iteration = htons(ntohs(payload->iteration) + 1);
 402         memcpy(&payload->msg, payload_msg, sizeof(payload_msg));
 403 
 404         /* Fill out remaining state members */
 405         atomic_set(&state->rx_good, 0);
 406         atomic_set(&state->rx_bad, 0);
 407         smp_wmb();
 408 }
 409 
 410 static int efx_begin_loopback(struct efx_tx_queue *tx_queue)
 411 {
 412         struct efx_nic *efx = tx_queue->efx;
 413         struct efx_loopback_state *state = efx->loopback_selftest;
 414         struct efx_loopback_payload *payload;
 415         struct sk_buff *skb;
 416         int i;
 417         netdev_tx_t rc;
 418 
 419         /* Transmit N copies of buffer */
 420         for (i = 0; i < state->packet_count; i++) {
 421                 /* Allocate an skb, holding an extra reference for
 422                  * transmit completion counting */
 423                 skb = alloc_skb(sizeof(state->payload), GFP_KERNEL);
 424                 if (!skb)
 425                         return -ENOMEM;
 426                 state->skbs[i] = skb;
 427                 skb_get(skb);
 428 
 429                 /* Copy the payload in, incrementing the source address to
 430                  * exercise the rss vectors */
 431                 payload = skb_put(skb, sizeof(state->payload));
 432                 memcpy(payload, &state->payload, sizeof(state->payload));
 433                 payload->ip.saddr = htonl(INADDR_LOOPBACK | (i << 2));
 434 
 435                 /* Ensure everything we've written is visible to the
 436                  * interrupt handler. */
 437                 smp_wmb();
 438 
 439                 netif_tx_lock_bh(efx->net_dev);
 440                 rc = efx_enqueue_skb(tx_queue, skb);
 441                 netif_tx_unlock_bh(efx->net_dev);
 442 
 443                 if (rc != NETDEV_TX_OK) {
 444                         netif_err(efx, drv, efx->net_dev,
 445                                   "TX queue %d could not transmit packet %d of "
 446                                   "%d in %s loopback test\n", tx_queue->queue,
 447                                   i + 1, state->packet_count,
 448                                   LOOPBACK_MODE(efx));
 449 
 450                         /* Defer cleaning up the other skbs for the caller */
 451                         kfree_skb(skb);
 452                         return -EPIPE;
 453                 }
 454         }
 455 
 456         return 0;
 457 }
 458 
 459 static int efx_poll_loopback(struct efx_nic *efx)
 460 {
 461         struct efx_loopback_state *state = efx->loopback_selftest;
 462 
 463         return atomic_read(&state->rx_good) == state->packet_count;
 464 }
 465 
 466 static int efx_end_loopback(struct efx_tx_queue *tx_queue,
 467                             struct efx_loopback_self_tests *lb_tests)
 468 {
 469         struct efx_nic *efx = tx_queue->efx;
 470         struct efx_loopback_state *state = efx->loopback_selftest;
 471         struct sk_buff *skb;
 472         int tx_done = 0, rx_good, rx_bad;
 473         int i, rc = 0;
 474 
 475         netif_tx_lock_bh(efx->net_dev);
 476 
 477         /* Count the number of tx completions, and decrement the refcnt. Any
 478          * skbs not already completed will be free'd when the queue is flushed */
 479         for (i = 0; i < state->packet_count; i++) {
 480                 skb = state->skbs[i];
 481                 if (skb && !skb_shared(skb))
 482                         ++tx_done;
 483                 dev_kfree_skb(skb);
 484         }
 485 
 486         netif_tx_unlock_bh(efx->net_dev);
 487 
 488         /* Check TX completion and received packet counts */
 489         rx_good = atomic_read(&state->rx_good);
 490         rx_bad = atomic_read(&state->rx_bad);
 491         if (tx_done != state->packet_count) {
 492                 /* Don't free the skbs; they will be picked up on TX
 493                  * overflow or channel teardown.
 494                  */
 495                 netif_err(efx, drv, efx->net_dev,
 496                           "TX queue %d saw only %d out of an expected %d "
 497                           "TX completion events in %s loopback test\n",
 498                           tx_queue->queue, tx_done, state->packet_count,
 499                           LOOPBACK_MODE(efx));
 500                 rc = -ETIMEDOUT;
 501                 /* Allow to fall through so we see the RX errors as well */
 502         }
 503 
 504         /* We may always be up to a flush away from our desired packet total */
 505         if (rx_good != state->packet_count) {
 506                 netif_dbg(efx, drv, efx->net_dev,
 507                           "TX queue %d saw only %d out of an expected %d "
 508                           "received packets in %s loopback test\n",
 509                           tx_queue->queue, rx_good, state->packet_count,
 510                           LOOPBACK_MODE(efx));
 511                 rc = -ETIMEDOUT;
 512                 /* Fall through */
 513         }
 514 
 515         /* Update loopback test structure */
 516         lb_tests->tx_sent[tx_queue->queue] += state->packet_count;
 517         lb_tests->tx_done[tx_queue->queue] += tx_done;
 518         lb_tests->rx_good += rx_good;
 519         lb_tests->rx_bad += rx_bad;
 520 
 521         return rc;
 522 }
 523 
 524 static int
 525 efx_test_loopback(struct efx_tx_queue *tx_queue,
 526                   struct efx_loopback_self_tests *lb_tests)
 527 {
 528         struct efx_nic *efx = tx_queue->efx;
 529         struct efx_loopback_state *state = efx->loopback_selftest;
 530         int i, begin_rc, end_rc;
 531 
 532         for (i = 0; i < 3; i++) {
 533                 /* Determine how many packets to send */
 534                 state->packet_count = efx->txq_entries / 3;
 535                 state->packet_count = min(1 << (i << 2), state->packet_count);
 536                 state->skbs = kcalloc(state->packet_count,
 537                                       sizeof(state->skbs[0]), GFP_KERNEL);
 538                 if (!state->skbs)
 539                         return -ENOMEM;
 540                 state->flush = false;
 541 
 542                 netif_dbg(efx, drv, efx->net_dev,
 543                           "TX queue %d testing %s loopback with %d packets\n",
 544                           tx_queue->queue, LOOPBACK_MODE(efx),
 545                           state->packet_count);
 546 
 547                 efx_iterate_state(efx);
 548                 begin_rc = efx_begin_loopback(tx_queue);
 549 
 550                 /* This will normally complete very quickly, but be
 551                  * prepared to wait much longer. */
 552                 msleep(1);
 553                 if (!efx_poll_loopback(efx)) {
 554                         msleep(LOOPBACK_TIMEOUT_MS);
 555                         efx_poll_loopback(efx);
 556                 }
 557 
 558                 end_rc = efx_end_loopback(tx_queue, lb_tests);
 559                 kfree(state->skbs);
 560 
 561                 if (begin_rc || end_rc) {
 562                         /* Wait a while to ensure there are no packets
 563                          * floating around after a failure. */
 564                         schedule_timeout_uninterruptible(HZ / 10);
 565                         return begin_rc ? begin_rc : end_rc;
 566                 }
 567         }
 568 
 569         netif_dbg(efx, drv, efx->net_dev,
 570                   "TX queue %d passed %s loopback test with a burst length "
 571                   "of %d packets\n", tx_queue->queue, LOOPBACK_MODE(efx),
 572                   state->packet_count);
 573 
 574         return 0;
 575 }
 576 
 577 /* Wait for link up. On Falcon, we would prefer to rely on efx_monitor, but
 578  * any contention on the mac lock (via e.g. efx_mac_mcast_work) causes it
 579  * to delay and retry. Therefore, it's safer to just poll directly. Wait
 580  * for link up and any faults to dissipate. */
 581 static int efx_wait_for_link(struct efx_nic *efx)
 582 {
 583         struct efx_link_state *link_state = &efx->link_state;
 584         int count, link_up_count = 0;
 585         bool link_up;
 586 
 587         for (count = 0; count < 40; count++) {
 588                 schedule_timeout_uninterruptible(HZ / 10);
 589 
 590                 if (efx->type->monitor != NULL) {
 591                         mutex_lock(&efx->mac_lock);
 592                         efx->type->monitor(efx);
 593                         mutex_unlock(&efx->mac_lock);
 594                 }
 595 
 596                 mutex_lock(&efx->mac_lock);
 597                 link_up = link_state->up;
 598                 if (link_up)
 599                         link_up = !efx->type->check_mac_fault(efx);
 600                 mutex_unlock(&efx->mac_lock);
 601 
 602                 if (link_up) {
 603                         if (++link_up_count == 2)
 604                                 return 0;
 605                 } else {
 606                         link_up_count = 0;
 607                 }
 608         }
 609 
 610         return -ETIMEDOUT;
 611 }
 612 
 613 static int efx_test_loopbacks(struct efx_nic *efx, struct efx_self_tests *tests,
 614                               unsigned int loopback_modes)
 615 {
 616         enum efx_loopback_mode mode;
 617         struct efx_loopback_state *state;
 618         struct efx_channel *channel =
 619                 efx_get_channel(efx, efx->tx_channel_offset);
 620         struct efx_tx_queue *tx_queue;
 621         int rc = 0;
 622 
 623         /* Set the port loopback_selftest member. From this point on
 624          * all received packets will be dropped. Mark the state as
 625          * "flushing" so all inflight packets are dropped */
 626         state = kzalloc(sizeof(*state), GFP_KERNEL);
 627         if (state == NULL)
 628                 return -ENOMEM;
 629         BUG_ON(efx->loopback_selftest);
 630         state->flush = true;
 631         efx->loopback_selftest = state;
 632 
 633         /* Test all supported loopback modes */
 634         for (mode = LOOPBACK_NONE; mode <= LOOPBACK_TEST_MAX; mode++) {
 635                 if (!(loopback_modes & (1 << mode)))
 636                         continue;
 637 
 638                 /* Move the port into the specified loopback mode. */
 639                 state->flush = true;
 640                 mutex_lock(&efx->mac_lock);
 641                 efx->loopback_mode = mode;
 642                 rc = __efx_reconfigure_port(efx);
 643                 mutex_unlock(&efx->mac_lock);
 644                 if (rc) {
 645                         netif_err(efx, drv, efx->net_dev,
 646                                   "unable to move into %s loopback\n",
 647                                   LOOPBACK_MODE(efx));
 648                         goto out;
 649                 }
 650 
 651                 rc = efx_wait_for_link(efx);
 652                 if (rc) {
 653                         netif_err(efx, drv, efx->net_dev,
 654                                   "loopback %s never came up\n",
 655                                   LOOPBACK_MODE(efx));
 656                         goto out;
 657                 }
 658 
 659                 /* Test all enabled types of TX queue */
 660                 efx_for_each_channel_tx_queue(tx_queue, channel) {
 661                         state->offload_csum = (tx_queue->queue &
 662                                                EFX_TXQ_TYPE_OFFLOAD);
 663                         rc = efx_test_loopback(tx_queue,
 664                                                &tests->loopback[mode]);
 665                         if (rc)
 666                                 goto out;
 667                 }
 668         }
 669 
 670  out:
 671         /* Remove the flush. The caller will remove the loopback setting */
 672         state->flush = true;
 673         efx->loopback_selftest = NULL;
 674         wmb();
 675         kfree(state);
 676 
 677         if (rc == -EPERM)
 678                 rc = 0;
 679 
 680         return rc;
 681 }
 682 
 683 /**************************************************************************
 684  *
 685  * Entry point
 686  *
 687  *************************************************************************/
 688 
 689 int efx_selftest(struct efx_nic *efx, struct efx_self_tests *tests,
 690                  unsigned flags)
 691 {
 692         enum efx_loopback_mode loopback_mode = efx->loopback_mode;
 693         int phy_mode = efx->phy_mode;
 694         int rc_test = 0, rc_reset, rc;
 695 
 696         efx_selftest_async_cancel(efx);
 697 
 698         /* Online (i.e. non-disruptive) testing
 699          * This checks interrupt generation, event delivery and PHY presence. */
 700 
 701         rc = efx_test_phy_alive(efx, tests);
 702         if (rc && !rc_test)
 703                 rc_test = rc;
 704 
 705         rc = efx_test_nvram(efx, tests);
 706         if (rc && !rc_test)
 707                 rc_test = rc;
 708 
 709         rc = efx_test_interrupts(efx, tests);
 710         if (rc && !rc_test)
 711                 rc_test = rc;
 712 
 713         rc = efx_test_eventq_irq(efx, tests);
 714         if (rc && !rc_test)
 715                 rc_test = rc;
 716 
 717         if (rc_test)
 718                 return rc_test;
 719 
 720         if (!(flags & ETH_TEST_FL_OFFLINE))
 721                 return efx_test_phy(efx, tests, flags);
 722 
 723         /* Offline (i.e. disruptive) testing
 724          * This checks MAC and PHY loopback on the specified port. */
 725 
 726         /* Detach the device so the kernel doesn't transmit during the
 727          * loopback test and the watchdog timeout doesn't fire.
 728          */
 729         efx_device_detach_sync(efx);
 730 
 731         if (efx->type->test_chip) {
 732                 rc_reset = efx->type->test_chip(efx, tests);
 733                 if (rc_reset) {
 734                         netif_err(efx, hw, efx->net_dev,
 735                                   "Unable to recover from chip test\n");
 736                         efx_schedule_reset(efx, RESET_TYPE_DISABLE);
 737                         return rc_reset;
 738                 }
 739 
 740                 if ((tests->memory < 0 || tests->registers < 0) && !rc_test)
 741                         rc_test = -EIO;
 742         }
 743 
 744         /* Ensure that the phy is powered and out of loopback
 745          * for the bist and loopback tests */
 746         mutex_lock(&efx->mac_lock);
 747         efx->phy_mode &= ~PHY_MODE_LOW_POWER;
 748         efx->loopback_mode = LOOPBACK_NONE;
 749         __efx_reconfigure_port(efx);
 750         mutex_unlock(&efx->mac_lock);
 751 
 752         rc = efx_test_phy(efx, tests, flags);
 753         if (rc && !rc_test)
 754                 rc_test = rc;
 755 
 756         rc = efx_test_loopbacks(efx, tests, efx->loopback_modes);
 757         if (rc && !rc_test)
 758                 rc_test = rc;
 759 
 760         /* restore the PHY to the previous state */
 761         mutex_lock(&efx->mac_lock);
 762         efx->phy_mode = phy_mode;
 763         efx->loopback_mode = loopback_mode;
 764         __efx_reconfigure_port(efx);
 765         mutex_unlock(&efx->mac_lock);
 766 
 767         efx_device_attach_if_not_resetting(efx);
 768 
 769         return rc_test;
 770 }
 771 
 772 void efx_selftest_async_start(struct efx_nic *efx)
 773 {
 774         struct efx_channel *channel;
 775 
 776         efx_for_each_channel(channel, efx)
 777                 efx_nic_event_test_start(channel);
 778         schedule_delayed_work(&efx->selftest_work, IRQ_TIMEOUT);
 779 }
 780 
 781 void efx_selftest_async_cancel(struct efx_nic *efx)
 782 {
 783         cancel_delayed_work_sync(&efx->selftest_work);
 784 }
 785 
 786 void efx_selftest_async_work(struct work_struct *data)
 787 {
 788         struct efx_nic *efx = container_of(data, struct efx_nic,
 789                                            selftest_work.work);
 790         struct efx_channel *channel;
 791         int cpu;
 792 
 793         efx_for_each_channel(channel, efx) {
 794                 cpu = efx_nic_event_test_irq_cpu(channel);
 795                 if (cpu < 0)
 796                         netif_err(efx, ifup, efx->net_dev,
 797                                   "channel %d failed to trigger an interrupt\n",
 798                                   channel->channel);
 799                 else
 800                         netif_dbg(efx, ifup, efx->net_dev,
 801                                   "channel %d triggered interrupt on CPU %d\n",
 802                                   channel->channel, cpu);
 803         }
 804 }