drivers/net/sfc/selftest.c

   1 /****************************************************************************
   2  * Driver for Solarflare Solarstorm network controllers and boards
   3  * Copyright 2005-2006 Fen Systems Ltd.
   4  * Copyright 2006-2009 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 <asm/io.h>
  22 #include "net_driver.h"
  23 #include "efx.h"
  24 #include "nic.h"
  25 #include "selftest.h"
  26 #include "workarounds.h"
  27 #include "spi.h"
  28 #include "io.h"
  29 #include "mdio_10g.h"
  30
  31 /*
  32  * Loopback test packet structure
  33  *
  34  * The self-test should stress every RSS vector, and unfortunately
  35  * Falcon only performs RSS on TCP/UDP packets.
  36  */
  37 struct efx_loopback_payload {
  38         struct ethhdr header;
  39         struct iphdr ip;
  40         struct udphdr udp;
  41         __be16 iteration;
  42         const char msg[64];
  43 } __attribute__ ((packed));
  44
  45 /* Loopback test source MAC address */
  46 static const unsigned char payload_source[ETH_ALEN] = {
  47         0x00, 0x0f, 0x53, 0x1b, 0x1b, 0x1b,
  48 };
  49
  50 static const char payload_msg[] =
  51         "Hello world! This is an Efx loopback test in progress!";
  52
  53 /**
  54  * efx_loopback_state - persistent state during a loopback selftest
  55  * @flush:              Drop all packets in efx_loopback_rx_packet
  56  * @packet_count:       Number of packets being used in this test
  57  * @skbs:               An array of skbs transmitted
  58  * @offload_csum:       Checksums are being offloaded
  59  * @rx_good:            RX good packet count
  60  * @rx_bad:             RX bad packet count
  61  * @payload:            Payload used in tests
  62  */
  63 struct efx_loopback_state {
  64         bool flush;
  65         int packet_count;
  66         struct sk_buff **skbs;
  67         bool offload_csum;
  68         atomic_t rx_good;
  69         atomic_t rx_bad;
  70         struct efx_loopback_payload payload;
  71 };
  72
  73 /**************************************************************************
  74  *
  75  * MII, NVRAM and register tests
  76  *
  77  **************************************************************************/
  78
  79 static int efx_test_mdio(struct efx_nic *efx, struct efx_self_tests *tests)
  80 {
  81         int rc = 0;
  82         int devad;
  83         u16 physid1, physid2;
  84
  85         if (efx->mdio.mode_support & MDIO_SUPPORTS_C45)
  86                 devad = __ffs(efx->mdio.mmds);
  87         else if (efx->mdio.mode_support & MDIO_SUPPORTS_C22)
  88                 devad = MDIO_DEVAD_NONE;
  89         else
  90                 return 0;
  91
  92         mutex_lock(&efx->mac_lock);
  93         tests->mdio = -1;
  94
  95         physid1 = efx_mdio_read(efx, devad, MDIO_DEVID1);
  96         physid2 = efx_mdio_read(efx, devad, MDIO_DEVID2);
  97
  98         if ((physid1 == 0x0000) || (physid1 == 0xffff) ||
  99             (physid2 == 0x0000) || (physid2 == 0xffff)) {
 100                 EFX_ERR(efx, "no MDIO PHY present with ID %d\n",
 101                         efx->mdio.prtad);
 102                 rc = -EINVAL;
 103                 goto out;
 104         }
 105
 106         if (EFX_IS10G(efx)) {
 107                 rc = efx_mdio_check_mmds(efx, efx->mdio.mmds, 0);
 108                 if (rc)
 109                         goto out;
 110         }
 111
 112 out:
 113         mutex_unlock(&efx->mac_lock);
 114         tests->mdio = rc ? -1 : 1;
 115         return rc;
 116 }
 117
 118 static int efx_test_nvram(struct efx_nic *efx, struct efx_self_tests *tests)
 119 {
 120         int rc = 0;
 121
 122         if (efx->type->test_nvram) {
 123                 rc = efx->type->test_nvram(efx);
 124                 tests->nvram = rc ? -1 : 1;
 125         }
 126
 127         return rc;
 128 }
 129
 130 static int efx_test_chip(struct efx_nic *efx, struct efx_self_tests *tests)
 131 {
 132         int rc = 0;
 133
 134         /* Test register access */
 135         if (efx->type->test_registers) {
 136                 rc = efx->type->test_registers(efx);
 137                 tests->registers = rc ? -1 : 1;
 138         }
 139
 140         return rc;
 141 }
 142
 143 /**************************************************************************
 144  *
 145  * Interrupt and event queue testing
 146  *
 147  **************************************************************************/
 148
 149 /* Test generation and receipt of interrupts */
 150 static int efx_test_interrupts(struct efx_nic *efx,
 151                                struct efx_self_tests *tests)
 152 {
 153         struct efx_channel *channel;
 154
 155         EFX_LOG(efx, "testing interrupts\n");
 156         tests->interrupt = -1;
 157
 158         /* Reset interrupt flag */
 159         efx->last_irq_cpu = -1;
 160         smp_wmb();
 161
 162         /* ACK each interrupting event queue. Receiving an interrupt due to
 163          * traffic before a test event is raised is considered a pass */
 164         efx_for_each_channel(channel, efx) {
 165                 if (channel->work_pending)
 166                         efx_process_channel_now(channel);
 167                 if (efx->last_irq_cpu >= 0)
 168                         goto success;
 169         }
 170
 171         efx_nic_generate_interrupt(efx);
 172
 173         /* Wait for arrival of test interrupt. */
 174         EFX_LOG(efx, "waiting for test interrupt\n");
 175         schedule_timeout_uninterruptible(HZ / 10);
 176         if (efx->last_irq_cpu >= 0)
 177                 goto success;
 178
 179         EFX_ERR(efx, "timed out waiting for interrupt\n");
 180         return -ETIMEDOUT;
 181
 182  success:
 183         EFX_LOG(efx, "%s test interrupt seen on CPU%d\n", INT_MODE(efx),
 184                 efx->last_irq_cpu);
 185         tests->interrupt = 1;
 186         return 0;
 187 }
 188
 189 /* Test generation and receipt of interrupting events */
 190 static int efx_test_eventq_irq(struct efx_channel *channel,
 191                                struct efx_self_tests *tests)
 192 {
 193         unsigned int magic, count;
 194
 195         /* Channel specific code, limited to 20 bits */
 196         magic = (0x00010150 + channel->channel);
 197         EFX_LOG(channel->efx, "channel %d testing event queue with code %x\n",
 198                 channel->channel, magic);
 199
 200         tests->eventq_dma[channel->channel] = -1;
 201         tests->eventq_int[channel->channel] = -1;
 202         tests->eventq_poll[channel->channel] = -1;
 203
 204         /* Reset flag and zero magic word */
 205         channel->efx->last_irq_cpu = -1;
 206         channel->eventq_magic = 0;
 207         smp_wmb();
 208
 209         efx_nic_generate_test_event(channel, magic);
 210
 211         /* Wait for arrival of interrupt */
 212         count = 0;
 213         do {
 214                 schedule_timeout_uninterruptible(HZ / 100);
 215
 216                 if (channel->work_pending)
 217                         efx_process_channel_now(channel);
 218
 219                 if (channel->eventq_magic == magic)
 220                         goto eventq_ok;
 221         } while (++count < 2);
 222
 223         EFX_ERR(channel->efx, "channel %d timed out waiting for event queue\n",
 224                 channel->channel);
 225
 226         /* See if interrupt arrived */
 227         if (channel->efx->last_irq_cpu >= 0) {
 228                 EFX_ERR(channel->efx, "channel %d saw interrupt on CPU%d "
 229                         "during event queue test\n", channel->channel,
 230                         raw_smp_processor_id());
 231                 tests->eventq_int[channel->channel] = 1;
 232         }
 233
 234         /* Check to see if event was received even if interrupt wasn't */
 235         efx_process_channel_now(channel);
 236         if (channel->eventq_magic == magic) {
 237                 EFX_ERR(channel->efx, "channel %d event was generated, but "
 238                         "failed to trigger an interrupt\n", channel->channel);
 239                 tests->eventq_dma[channel->channel] = 1;
 240         }
 241
 242         return -ETIMEDOUT;
 243  eventq_ok:
 244         EFX_LOG(channel->efx, "channel %d event queue passed\n",
 245                 channel->channel);
 246         tests->eventq_dma[channel->channel] = 1;
 247         tests->eventq_int[channel->channel] = 1;
 248         tests->eventq_poll[channel->channel] = 1;
 249         return 0;
 250 }
 251
 252 static int efx_test_phy(struct efx_nic *efx, struct efx_self_tests *tests,
 253                         unsigned flags)
 254 {
 255         int rc;
 256
 257         if (!efx->phy_op->run_tests)
 258                 return 0;
 259
 260         mutex_lock(&efx->mac_lock);
 261         rc = efx->phy_op->run_tests(efx, tests->phy, flags);
 262         mutex_unlock(&efx->mac_lock);
 263         return rc;
 264 }
 265
 266 /**************************************************************************
 267  *
 268  * Loopback testing
 269  * NB Only one loopback test can be executing concurrently.
 270  *
 271  **************************************************************************/
 272
 273 /* Loopback test RX callback
 274  * This is called for each received packet during loopback testing.
 275  */
 276 void efx_loopback_rx_packet(struct efx_nic *efx,
 277                             const char *buf_ptr, int pkt_len)
 278 {
 279         struct efx_loopback_state *state = efx->loopback_selftest;
 280         struct efx_loopback_payload *received;
 281         struct efx_loopback_payload *payload;
 282
 283         BUG_ON(!buf_ptr);
 284
 285         /* If we are just flushing, then drop the packet */
 286         if ((state == NULL) || state->flush)
 287                 return;
 288
 289         payload = &state->payload;
 290
 291         received = (struct efx_loopback_payload *) buf_ptr;
 292         received->ip.saddr = payload->ip.saddr;
 293         if (state->offload_csum)
 294                 received->ip.check = payload->ip.check;
 295
 296         /* Check that header exists */
 297         if (pkt_len < sizeof(received->header)) {
 298                 EFX_ERR(efx, "saw runt RX packet (length %d) in %s loopback "
 299                         "test\n", pkt_len, LOOPBACK_MODE(efx));
 300                 goto err;
 301         }
 302
 303         /* Check that the ethernet header exists */
 304         if (memcmp(&received->header, &payload->header, ETH_HLEN) != 0) {
 305                 EFX_ERR(efx, "saw non-loopback RX packet in %s loopback test\n",
 306                         LOOPBACK_MODE(efx));
 307                 goto err;
 308         }
 309
 310         /* Check packet length */
 311         if (pkt_len != sizeof(*payload)) {
 312                 EFX_ERR(efx, "saw incorrect RX packet length %d (wanted %d) in "
 313                         "%s loopback test\n", pkt_len, (int)sizeof(*payload),
 314                         LOOPBACK_MODE(efx));
 315                 goto err;
 316         }
 317
 318         /* Check that IP header matches */
 319         if (memcmp(&received->ip, &payload->ip, sizeof(payload->ip)) != 0) {
 320                 EFX_ERR(efx, "saw corrupted IP header in %s loopback test\n",
 321                         LOOPBACK_MODE(efx));
 322                 goto err;
 323         }
 324
 325         /* Check that msg and padding matches */
 326         if (memcmp(&received->msg, &payload->msg, sizeof(received->msg)) != 0) {
 327                 EFX_ERR(efx, "saw corrupted RX packet in %s loopback test\n",
 328                         LOOPBACK_MODE(efx));
 329                 goto err;
 330         }
 331
 332         /* Check that iteration matches */
 333         if (received->iteration != payload->iteration) {
 334                 EFX_ERR(efx, "saw RX packet from iteration %d (wanted %d) in "
 335                         "%s loopback test\n", ntohs(received->iteration),
 336                         ntohs(payload->iteration), LOOPBACK_MODE(efx));
 337                 goto err;
 338         }
 339
 340         /* Increase correct RX count */
 341         EFX_TRACE(efx, "got loopback RX in %s loopback test\n",
 342                   LOOPBACK_MODE(efx));
 343
 344         atomic_inc(&state->rx_good);
 345         return;
 346
 347  err:
 348 #ifdef EFX_ENABLE_DEBUG
 349         if (atomic_read(&state->rx_bad) == 0) {
 350                 EFX_ERR(efx, "received packet:\n");
 351                 print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 0x10, 1,
 352                                buf_ptr, pkt_len, 0);
 353                 EFX_ERR(efx, "expected packet:\n");
 354                 print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 0x10, 1,
 355                                &state->payload, sizeof(state->payload), 0);
 356         }
 357 #endif
 358         atomic_inc(&state->rx_bad);
 359 }
 360
 361 /* Initialise an efx_selftest_state for a new iteration */
 362 static void efx_iterate_state(struct efx_nic *efx)
 363 {
 364         struct efx_loopback_state *state = efx->loopback_selftest;
 365         struct net_device *net_dev = efx->net_dev;
 366         struct efx_loopback_payload *payload = &state->payload;
 367
 368         /* Initialise the layerII header */
 369         memcpy(&payload->header.h_dest, net_dev->dev_addr, ETH_ALEN);
 370         memcpy(&payload->header.h_source, &payload_source, ETH_ALEN);
 371         payload->header.h_proto = htons(ETH_P_IP);
 372
 373         /* saddr set later and used as incrementing count */
 374         payload->ip.daddr = htonl(INADDR_LOOPBACK);
 375         payload->ip.ihl = 5;
 376         payload->ip.check = htons(0xdead);
 377         payload->ip.tot_len = htons(sizeof(*payload) - sizeof(struct ethhdr));
 378         payload->ip.version = IPVERSION;
 379         payload->ip.protocol = IPPROTO_UDP;
 380
 381         /* Initialise udp header */
 382         payload->udp.source = 0;
 383         payload->udp.len = htons(sizeof(*payload) - sizeof(struct ethhdr) -
 384                                  sizeof(struct iphdr));
 385         payload->udp.check = 0; /* checksum ignored */
 386
 387         /* Fill out payload */
 388         payload->iteration = htons(ntohs(payload->iteration) + 1);
 389         memcpy(&payload->msg, payload_msg, sizeof(payload_msg));
 390
 391         /* Fill out remaining state members */
 392         atomic_set(&state->rx_good, 0);
 393         atomic_set(&state->rx_bad, 0);
 394         smp_wmb();
 395 }
 396
 397 static int efx_begin_loopback(struct efx_tx_queue *tx_queue)
 398 {
 399         struct efx_nic *efx = tx_queue->efx;
 400         struct efx_loopback_state *state = efx->loopback_selftest;
 401         struct efx_loopback_payload *payload;
 402         struct sk_buff *skb;
 403         int i;
 404         netdev_tx_t rc;
 405
 406         /* Transmit N copies of buffer */
 407         for (i = 0; i < state->packet_count; i++) {
 408                 /* Allocate an skb, holding an extra reference for
 409                  * transmit completion counting */
 410                 skb = alloc_skb(sizeof(state->payload), GFP_KERNEL);
 411                 if (!skb)
 412                         return -ENOMEM;
 413                 state->skbs[i] = skb;
 414                 skb_get(skb);
 415
 416                 /* Copy the payload in, incrementing the source address to
 417                  * exercise the rss vectors */
 418                 payload = ((struct efx_loopback_payload *)
 419                            skb_put(skb, sizeof(state->payload)));
 420                 memcpy(payload, &state->payload, sizeof(state->payload));
 421                 payload->ip.saddr = htonl(INADDR_LOOPBACK | (i << 2));
 422
 423                 /* Ensure everything we've written is visible to the
 424                  * interrupt handler. */
 425                 smp_wmb();
 426
 427                 if (efx_dev_registered(efx))
 428                         netif_tx_lock_bh(efx->net_dev);
 429                 rc = efx_enqueue_skb(tx_queue, skb);
 430                 if (efx_dev_registered(efx))
 431                         netif_tx_unlock_bh(efx->net_dev);
 432
 433                 if (rc != NETDEV_TX_OK) {
 434                         EFX_ERR(efx, "TX queue %d could not transmit packet %d "
 435                                 "of %d in %s loopback test\n", tx_queue->queue,
 436                                 i + 1, state->packet_count, LOOPBACK_MODE(efx));
 437
 438                         /* Defer cleaning up the other skbs for the caller */
 439                         kfree_skb(skb);
 440                         return -EPIPE;
 441                 }
 442         }
 443
 444         return 0;
 445 }
 446
 447 static int efx_poll_loopback(struct efx_nic *efx)
 448 {
 449         struct efx_loopback_state *state = efx->loopback_selftest;
 450         struct efx_channel *channel;
 451
 452         /* NAPI polling is not enabled, so process channels
 453          * synchronously */
 454         efx_for_each_channel(channel, efx) {
 455                 if (channel->work_pending)
 456                         efx_process_channel_now(channel);
 457         }
 458         return atomic_read(&state->rx_good) == state->packet_count;
 459 }
 460
 461 static int efx_end_loopback(struct efx_tx_queue *tx_queue,
 462                             struct efx_loopback_self_tests *lb_tests)
 463 {
 464         struct efx_nic *efx = tx_queue->efx;
 465         struct efx_loopback_state *state = efx->loopback_selftest;
 466         struct sk_buff *skb;
 467         int tx_done = 0, rx_good, rx_bad;
 468         int i, rc = 0;
 469
 470         if (efx_dev_registered(efx))
 471                 netif_tx_lock_bh(efx->net_dev);
 472
 473         /* Count the number of tx completions, and decrement the refcnt. Any
 474          * skbs not already completed will be free'd when the queue is flushed */
 475         for (i=0; i < state->packet_count; i++) {
 476                 skb = state->skbs[i];
 477                 if (skb && !skb_shared(skb))
 478                         ++tx_done;
 479                 dev_kfree_skb_any(skb);
 480         }
 481
 482         if (efx_dev_registered(efx))
 483                 netif_tx_unlock_bh(efx->net_dev);
 484
 485         /* Check TX completion and received packet counts */
 486         rx_good = atomic_read(&state->rx_good);
 487         rx_bad = atomic_read(&state->rx_bad);
 488         if (tx_done != state->packet_count) {
 489                 /* Don't free the skbs; they will be picked up on TX
 490                  * overflow or channel teardown.
 491                  */
 492                 EFX_ERR(efx, "TX queue %d saw only %d out of an expected %d "
 493                         "TX completion events in %s loopback test\n",
 494                         tx_queue->queue, tx_done, state->packet_count,
 495                         LOOPBACK_MODE(efx));
 496                 rc = -ETIMEDOUT;
 497                 /* Allow to fall through so we see the RX errors as well */
 498         }
 499
 500         /* We may always be up to a flush away from our desired packet total */
 501         if (rx_good != state->packet_count) {
 502                 EFX_LOG(efx, "TX queue %d saw only %d out of an expected %d "
 503                         "received packets in %s loopback test\n",
 504                         tx_queue->queue, rx_good, state->packet_count,
 505                         LOOPBACK_MODE(efx));
 506                 rc = -ETIMEDOUT;
 507                 /* Fall through */
 508         }
 509
 510         /* Update loopback test structure */
 511         lb_tests->tx_sent[tx_queue->queue] += state->packet_count;
 512         lb_tests->tx_done[tx_queue->queue] += tx_done;
 513         lb_tests->rx_good += rx_good;
 514         lb_tests->rx_bad += rx_bad;
 515
 516         return rc;
 517 }
 518
 519 static int
 520 efx_test_loopback(struct efx_tx_queue *tx_queue,
 521                   struct efx_loopback_self_tests *lb_tests)
 522 {
 523         struct efx_nic *efx = tx_queue->efx;
 524         struct efx_loopback_state *state = efx->loopback_selftest;
 525         int i, begin_rc, end_rc;
 526
 527         for (i = 0; i < 3; i++) {
 528                 /* Determine how many packets to send */
 529                 state->packet_count = EFX_TXQ_SIZE / 3;
 530                 state->packet_count = min(1 << (i << 2), state->packet_count);
 531                 state->skbs = kzalloc(sizeof(state->skbs[0]) *
 532                                       state->packet_count, GFP_KERNEL);
 533                 if (!state->skbs)
 534                         return -ENOMEM;
 535                 state->flush = false;
 536
 537                 EFX_LOG(efx, "TX queue %d testing %s loopback with %d "
 538                         "packets\n", tx_queue->queue, LOOPBACK_MODE(efx),
 539                         state->packet_count);
 540
 541                 efx_iterate_state(efx);
 542                 begin_rc = efx_begin_loopback(tx_queue);
 543
 544                 /* This will normally complete very quickly, but be
 545                  * prepared to wait up to 100 ms. */
 546                 msleep(1);
 547                 if (!efx_poll_loopback(efx)) {
 548                         msleep(100);
 549                         efx_poll_loopback(efx);
 550                 }
 551
 552                 end_rc = efx_end_loopback(tx_queue, lb_tests);
 553                 kfree(state->skbs);
 554
 555                 if (begin_rc || end_rc) {
 556                         /* Wait a while to ensure there are no packets
 557                          * floating around after a failure. */
 558                         schedule_timeout_uninterruptible(HZ / 10);
 559                         return begin_rc ? begin_rc : end_rc;
 560                 }
 561         }
 562
 563         EFX_LOG(efx, "TX queue %d passed %s loopback test with a burst length "
 564                 "of %d packets\n", tx_queue->queue, LOOPBACK_MODE(efx),
 565                 state->packet_count);
 566
 567         return 0;
 568 }
 569
 570 /* Wait for link up. On Falcon, we would prefer to rely on efx_monitor, but
 571  * any contention on the mac lock (via e.g. efx_mac_mcast_work) causes it
 572  * to delay and retry. Therefore, it's safer to just poll directly. Wait
 573  * for link up and any faults to dissipate. */
 574 static int efx_wait_for_link(struct efx_nic *efx)
 575 {
 576         struct efx_link_state *link_state = &efx->link_state;
 577         int count;
 578         bool link_up;
 579
 580         for (count = 0; count < 40; count++) {
 581                 schedule_timeout_uninterruptible(HZ / 10);
 582
 583                 if (efx->type->monitor != NULL) {
 584                         mutex_lock(&efx->mac_lock);
 585                         efx->type->monitor(efx);
 586                         mutex_unlock(&efx->mac_lock);
 587                 } else {
 588                         struct efx_channel *channel = &efx->channel[0];
 589                         if (channel->work_pending)
 590                                 efx_process_channel_now(channel);
 591                 }
 592
 593                 mutex_lock(&efx->mac_lock);
 594                 link_up = link_state->up;
 595                 if (link_up)
 596                         link_up = !efx->mac_op->check_fault(efx);
 597                 mutex_unlock(&efx->mac_lock);
 598
 599                 if (link_up)
 600                         return 0;
 601         }
 602
 603         return -ETIMEDOUT;
 604 }
 605
 606 static int efx_test_loopbacks(struct efx_nic *efx, struct efx_self_tests *tests,
 607                               unsigned int loopback_modes)
 608 {
 609         enum efx_loopback_mode mode;
 610         struct efx_loopback_state *state;
 611         struct efx_tx_queue *tx_queue;
 612         int rc = 0;
 613
 614         /* Set the port loopback_selftest member. From this point on
 615          * all received packets will be dropped. Mark the state as
 616          * "flushing" so all inflight packets are dropped */
 617         state = kzalloc(sizeof(*state), GFP_KERNEL);
 618         if (state == NULL)
 619                 return -ENOMEM;
 620         BUG_ON(efx->loopback_selftest);
 621         state->flush = true;
 622         efx->loopback_selftest = state;
 623
 624         /* Test all supported loopback modes */
 625         for (mode = LOOPBACK_NONE; mode <= LOOPBACK_TEST_MAX; mode++) {
 626                 if (!(loopback_modes & (1 << mode)))
 627                         continue;
 628
 629                 /* Move the port into the specified loopback mode. */
 630                 state->flush = true;
 631                 mutex_lock(&efx->mac_lock);
 632                 efx->loopback_mode = mode;
 633                 rc = __efx_reconfigure_port(efx);
 634                 mutex_unlock(&efx->mac_lock);
 635                 if (rc) {
 636                         EFX_ERR(efx, "unable to move into %s loopback\n",
 637                                 LOOPBACK_MODE(efx));
 638                         goto out;
 639                 }
 640
 641                 rc = efx_wait_for_link(efx);
 642                 if (rc) {
 643                         EFX_ERR(efx, "loopback %s never came up\n",
 644                                 LOOPBACK_MODE(efx));
 645                         goto out;
 646                 }
 647
 648                 /* Test every TX queue */
 649                 efx_for_each_tx_queue(tx_queue, efx) {
 650                         state->offload_csum = (tx_queue->queue ==
 651                                                EFX_TX_QUEUE_OFFLOAD_CSUM);
 652                         rc = efx_test_loopback(tx_queue,
 653                                                &tests->loopback[mode]);
 654                         if (rc)
 655                                 goto out;
 656                 }
 657         }
 658
 659  out:
 660         /* Remove the flush. The caller will remove the loopback setting */
 661         state->flush = true;
 662         efx->loopback_selftest = NULL;
 663         wmb();
 664         kfree(state);
 665
 666         return rc;
 667 }
 668
 669 /**************************************************************************
 670  *
 671  * Entry point
 672  *
 673  *************************************************************************/
 674
 675 int efx_selftest(struct efx_nic *efx, struct efx_self_tests *tests,
 676                  unsigned flags)
 677 {
 678         enum efx_loopback_mode loopback_mode = efx->loopback_mode;
 679         int phy_mode = efx->phy_mode;
 680         enum reset_type reset_method = RESET_TYPE_INVISIBLE;
 681         struct efx_channel *channel;
 682         int rc_test = 0, rc_reset = 0, rc;
 683
 684         /* Online (i.e. non-disruptive) testing
 685          * This checks interrupt generation, event delivery and PHY presence. */
 686
 687         rc = efx_test_mdio(efx, tests);
 688         if (rc && !rc_test)
 689                 rc_test = rc;
 690
 691         rc = efx_test_nvram(efx, tests);
 692         if (rc && !rc_test)
 693                 rc_test = rc;
 694
 695         rc = efx_test_interrupts(efx, tests);
 696         if (rc && !rc_test)
 697                 rc_test = rc;
 698
 699         efx_for_each_channel(channel, efx) {
 700                 rc = efx_test_eventq_irq(channel, tests);
 701                 if (rc && !rc_test)
 702                         rc_test = rc;
 703         }
 704
 705         if (rc_test)
 706                 return rc_test;
 707
 708         if (!(flags & ETH_TEST_FL_OFFLINE))
 709                 return efx_test_phy(efx, tests, flags);
 710
 711         /* Offline (i.e. disruptive) testing
 712          * This checks MAC and PHY loopback on the specified port. */
 713
 714         /* force the carrier state off so the kernel doesn't transmit during
 715          * the loopback test, and the watchdog timeout doesn't fire. Also put
 716          * falcon into loopback for the register test.
 717          */
 718         mutex_lock(&efx->mac_lock);
 719         efx->port_inhibited = true;
 720         if (efx->loopback_modes) {
 721                 /* We need the 312 clock from the PHY to test the XMAC
 722                  * registers, so move into XGMII loopback if available */
 723                 if (efx->loopback_modes & (1 << LOOPBACK_XGMII))
 724                         efx->loopback_mode = LOOPBACK_XGMII;
 725                 else
 726                         efx->loopback_mode = __ffs(efx->loopback_modes);
 727         }
 728
 729         __efx_reconfigure_port(efx);
 730         mutex_unlock(&efx->mac_lock);
 731
 732         /* free up all consumers of SRAM (including all the queues) */
 733         efx_reset_down(efx, reset_method);
 734
 735         rc = efx_test_chip(efx, tests);
 736         if (rc && !rc_test)
 737                 rc_test = rc;
 738
 739         /* reset the chip to recover from the register test */
 740         rc_reset = efx->type->reset(efx, reset_method);
 741
 742         /* Ensure that the phy is powered and out of loopback
 743          * for the bist and loopback tests */
 744         efx->phy_mode &= ~PHY_MODE_LOW_POWER;
 745         efx->loopback_mode = LOOPBACK_NONE;
 746
 747         rc = efx_reset_up(efx, reset_method, rc_reset == 0);
 748         if (rc && !rc_reset)
 749                 rc_reset = rc;
 750
 751         if (rc_reset) {
 752                 EFX_ERR(efx, "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