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