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