drivers/net/sfc/selftest.c

   1 /****************************************************************************
   2  * Driver for Solarflare Solarstorm network controllers and boards
   3  * Copyright 2005-2006 Fen Systems Ltd.
   4  * Copyright 2006-2008 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 "falcon.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 = __ffs(efx->mdio.mmds);
  83         u16 physid1, physid2;
  84
  85         if (efx->phy_type == PHY_TYPE_NONE)
  86                 return 0;
  87
  88         mutex_lock(&efx->mac_lock);
  89         tests->mdio = -1;
  90
  91         physid1 = efx_mdio_read(efx, devad, MDIO_DEVID1);
  92         physid2 = efx_mdio_read(efx, devad, MDIO_DEVID2);
  93
  94         if ((physid1 == 0x0000) || (physid1 == 0xffff) ||
  95             (physid2 == 0x0000) || (physid2 == 0xffff)) {
  96                 EFX_ERR(efx, "no MDIO PHY present with ID %d\n",
  97                         efx->mdio.prtad);
  98                 rc = -EINVAL;
  99                 goto out;
 100         }
 101
 102         if (EFX_IS10G(efx)) {
 103                 rc = efx_mdio_check_mmds(efx, efx->phy_op->mmds, 0);
 104                 if (rc)
 105                         goto out;
 106         }
 107
 108 out:
 109         mutex_unlock(&efx->mac_lock);
 110         tests->mdio = rc ? -1 : 1;
 111         return rc;
 112 }
 113
 114 static int efx_test_nvram(struct efx_nic *efx, struct efx_self_tests *tests)
 115 {
 116         int rc;
 117
 118         rc = falcon_read_nvram(efx, NULL);
 119         tests->nvram = rc ? -1 : 1;
 120         return rc;
 121 }
 122
 123 static int efx_test_chip(struct efx_nic *efx, struct efx_self_tests *tests)
 124 {
 125         int rc;
 126
 127         /* Not supported on A-series silicon */
 128         if (efx_nic_rev(efx) < EFX_REV_FALCON_B0)
 129                 return 0;
 130
 131         rc = falcon_test_registers(efx);
 132         tests->registers = rc ? -1 : 1;
 133         return rc;
 134 }
 135
 136 /**************************************************************************
 137  *
 138  * Interrupt and event queue testing
 139  *
 140  **************************************************************************/
 141
 142 /* Test generation and receipt of interrupts */
 143 static int efx_test_interrupts(struct efx_nic *efx,
 144                                struct efx_self_tests *tests)
 145 {
 146         struct efx_channel *channel;
 147
 148         EFX_LOG(efx, "testing interrupts\n");
 149         tests->interrupt = -1;
 150
 151         /* Reset interrupt flag */
 152         efx->last_irq_cpu = -1;
 153         smp_wmb();
 154
 155         /* ACK each interrupting event queue. Receiving an interrupt due to
 156          * traffic before a test event is raised is considered a pass */
 157         efx_for_each_channel(channel, efx) {
 158                 if (channel->work_pending)
 159                         efx_process_channel_now(channel);
 160                 if (efx->last_irq_cpu >= 0)
 161                         goto success;
 162         }
 163
 164         falcon_generate_interrupt(efx);
 165
 166         /* Wait for arrival of test interrupt. */
 167         EFX_LOG(efx, "waiting for test interrupt\n");
 168         schedule_timeout_uninterruptible(HZ / 10);
 169         if (efx->last_irq_cpu >= 0)
 170                 goto success;
 171
 172         EFX_ERR(efx, "timed out waiting for interrupt\n");
 173         return -ETIMEDOUT;
 174
 175  success:
 176         EFX_LOG(efx, "%s test interrupt seen on CPU%d\n", INT_MODE(efx),
 177                 efx->last_irq_cpu);
 178         tests->interrupt = 1;
 179         return 0;
 180 }
 181
 182 /* Test generation and receipt of interrupting events */
 183 static int efx_test_eventq_irq(struct efx_channel *channel,
 184                                struct efx_self_tests *tests)
 185 {
 186         unsigned int magic, count;
 187
 188         /* Channel specific code, limited to 20 bits */
 189         magic = (0x00010150 + channel->channel);
 190         EFX_LOG(channel->efx, "channel %d testing event queue with code %x\n",
 191                 channel->channel, magic);
 192
 193         tests->eventq_dma[channel->channel] = -1;
 194         tests->eventq_int[channel->channel] = -1;
 195         tests->eventq_poll[channel->channel] = -1;
 196
 197         /* Reset flag and zero magic word */
 198         channel->efx->last_irq_cpu = -1;
 199         channel->eventq_magic = 0;
 200         smp_wmb();
 201
 202         falcon_generate_test_event(channel, magic);
 203
 204         /* Wait for arrival of interrupt */
 205         count = 0;
 206         do {
 207                 schedule_timeout_uninterruptible(HZ / 100);
 208
 209                 if (channel->work_pending)
 210                         efx_process_channel_now(channel);
 211
 212                 if (channel->eventq_magic == magic)
 213                         goto eventq_ok;
 214         } while (++count < 2);
 215
 216         EFX_ERR(channel->efx, "channel %d timed out waiting for event queue\n",
 217                 channel->channel);
 218
 219         /* See if interrupt arrived */
 220         if (channel->efx->last_irq_cpu >= 0) {
 221                 EFX_ERR(channel->efx, "channel %d saw interrupt on CPU%d "
 222                         "during event queue test\n", channel->channel,
 223                         raw_smp_processor_id());
 224                 tests->eventq_int[channel->channel] = 1;
 225         }
 226
 227         /* Check to see if event was received even if interrupt wasn't */
 228         efx_process_channel_now(channel);
 229         if (channel->eventq_magic == magic) {
 230                 EFX_ERR(channel->efx, "channel %d event was generated, but "
 231                         "failed to trigger an interrupt\n", channel->channel);
 232                 tests->eventq_dma[channel->channel] = 1;
 233         }
 234
 235         return -ETIMEDOUT;
 236  eventq_ok:
 237         EFX_LOG(channel->efx, "channel %d event queue passed\n",
 238                 channel->channel);
 239         tests->eventq_dma[channel->channel] = 1;
 240         tests->eventq_int[channel->channel] = 1;
 241         tests->eventq_poll[channel->channel] = 1;
 242         return 0;
 243 }
 244
 245 static int efx_test_phy(struct efx_nic *efx, struct efx_self_tests *tests,
 246                         unsigned flags)
 247 {
 248         int rc;
 249
 250         if (!efx->phy_op->run_tests)
 251                 return 0;
 252
 253         EFX_BUG_ON_PARANOID(efx->phy_op->num_tests == 0 ||
 254                             efx->phy_op->num_tests > EFX_MAX_PHY_TESTS);
 255
 256         mutex_lock(&efx->mac_lock);
 257         rc = efx->phy_op->run_tests(efx, tests->phy, flags);
 258         mutex_unlock(&efx->mac_lock);
 259         return rc;
 260 }
 261
 262 /**************************************************************************
 263  *
 264  * Loopback testing
 265  * NB Only one loopback test can be executing concurrently.
 266  *
 267  **************************************************************************/
 268
 269 /* Loopback test RX callback
 270  * This is called for each received packet during loopback testing.
 271  */
 272 void efx_loopback_rx_packet(struct efx_nic *efx,
 273                             const char *buf_ptr, int pkt_len)
 274 {
 275         struct efx_loopback_state *state = efx->loopback_selftest;
 276         struct efx_loopback_payload *received;
 277         struct efx_loopback_payload *payload;
 278
 279         BUG_ON(!buf_ptr);
 280
 281         /* If we are just flushing, then drop the packet */
 282         if ((state == NULL) || state->flush)
 283                 return;
 284
 285         payload = &state->payload;
 286
 287         received = (struct efx_loopback_payload *) buf_ptr;
 288         received->ip.saddr = payload->ip.saddr;
 289         if (state->offload_csum)
 290                 received->ip.check = payload->ip.check;
 291
 292         /* Check that header exists */
 293         if (pkt_len < sizeof(received->header)) {
 294                 EFX_ERR(efx, "saw runt RX packet (length %d) in %s loopback "
 295                         "test\n", pkt_len, LOOPBACK_MODE(efx));
 296                 goto err;
 297         }
 298
 299         /* Check that the ethernet header exists */
 300         if (memcmp(&received->header, &payload->header, ETH_HLEN) != 0) {
 301                 EFX_ERR(efx, "saw non-loopback RX packet in %s loopback test\n",
 302                         LOOPBACK_MODE(efx));
 303                 goto err;
 304         }
 305
 306         /* Check packet length */
 307         if (pkt_len != sizeof(*payload)) {
 308                 EFX_ERR(efx, "saw incorrect RX packet length %d (wanted %d) in "
 309                         "%s loopback test\n", pkt_len, (int)sizeof(*payload),
 310                         LOOPBACK_MODE(efx));
 311                 goto err;
 312         }
 313
 314         /* Check that IP header matches */
 315         if (memcmp(&received->ip, &payload->ip, sizeof(payload->ip)) != 0) {
 316                 EFX_ERR(efx, "saw corrupted IP header in %s loopback test\n",
 317                         LOOPBACK_MODE(efx));
 318                 goto err;
 319         }
 320
 321         /* Check that msg and padding matches */
 322         if (memcmp(&received->msg, &payload->msg, sizeof(received->msg)) != 0) {
 323                 EFX_ERR(efx, "saw corrupted RX packet in %s loopback test\n",
 324                         LOOPBACK_MODE(efx));
 325                 goto err;
 326         }
 327
 328         /* Check that iteration matches */
 329         if (received->iteration != payload->iteration) {
 330                 EFX_ERR(efx, "saw RX packet from iteration %d (wanted %d) in "
 331                         "%s loopback test\n", ntohs(received->iteration),
 332                         ntohs(payload->iteration), LOOPBACK_MODE(efx));
 333                 goto err;
 334         }
 335
 336         /* Increase correct RX count */
 337         EFX_TRACE(efx, "got loopback RX in %s loopback test\n",
 338                   LOOPBACK_MODE(efx));
 339
 340         atomic_inc(&state->rx_good);
 341         return;
 342
 343  err:
 344 #ifdef EFX_ENABLE_DEBUG
 345         if (atomic_read(&state->rx_bad) == 0) {
 346                 EFX_ERR(efx, "received packet:\n");
 347                 print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 0x10, 1,
 348                                buf_ptr, pkt_len, 0);
 349                 EFX_ERR(efx, "expected packet:\n");
 350                 print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 0x10, 1,
 351                                &state->payload, sizeof(state->payload), 0);
 352         }
 353 #endif
 354         atomic_inc(&state->rx_bad);
 355 }
 356
 357 /* Initialise an efx_selftest_state for a new iteration */
 358 static void efx_iterate_state(struct efx_nic *efx)
 359 {
 360         struct efx_loopback_state *state = efx->loopback_selftest;
 361         struct net_device *net_dev = efx->net_dev;
 362         struct efx_loopback_payload *payload = &state->payload;
 363
 364         /* Initialise the layerII header */
 365         memcpy(&payload->header.h_dest, net_dev->dev_addr, ETH_ALEN);
 366         memcpy(&payload->header.h_source, &payload_source, ETH_ALEN);
 367         payload->header.h_proto = htons(ETH_P_IP);
 368
 369         /* saddr set later and used as incrementing count */
 370         payload->ip.daddr = htonl(INADDR_LOOPBACK);
 371         payload->ip.ihl = 5;
 372         payload->ip.check = htons(0xdead);
 373         payload->ip.tot_len = htons(sizeof(*payload) - sizeof(struct ethhdr));
 374         payload->ip.version = IPVERSION;
 375         payload->ip.protocol = IPPROTO_UDP;
 376
 377         /* Initialise udp header */
 378         payload->udp.source = 0;
 379         payload->udp.len = htons(sizeof(*payload) - sizeof(struct ethhdr) -
 380                                  sizeof(struct iphdr));
 381         payload->udp.check = 0; /* checksum ignored */
 382
 383         /* Fill out payload */
 384         payload->iteration = htons(ntohs(payload->iteration) + 1);
 385         memcpy(&payload->msg, payload_msg, sizeof(payload_msg));
 386
 387         /* Fill out remaining state members */
 388         atomic_set(&state->rx_good, 0);
 389         atomic_set(&state->rx_bad, 0);
 390         smp_wmb();
 391 }
 392
 393 static int efx_begin_loopback(struct efx_tx_queue *tx_queue)
 394 {
 395         struct efx_nic *efx = tx_queue->efx;
 396         struct efx_loopback_state *state = efx->loopback_selftest;
 397         struct efx_loopback_payload *payload;
 398         struct sk_buff *skb;
 399         int i;
 400         netdev_tx_t rc;
 401
 402         /* Transmit N copies of buffer */
 403         for (i = 0; i < state->packet_count; i++) {
 404                 /* Allocate an skb, holding an extra reference for
 405                  * transmit completion counting */
 406                 skb = alloc_skb(sizeof(state->payload), GFP_KERNEL);
 407                 if (!skb)
 408                         return -ENOMEM;
 409                 state->skbs[i] = skb;
 410                 skb_get(skb);
 411
 412                 /* Copy the payload in, incrementing the source address to
 413                  * exercise the rss vectors */
 414                 payload = ((struct efx_loopback_payload *)
 415                            skb_put(skb, sizeof(state->payload)));
 416                 memcpy(payload, &state->payload, sizeof(state->payload));
 417                 payload->ip.saddr = htonl(INADDR_LOOPBACK | (i << 2));
 418
 419                 /* Ensure everything we've written is visible to the
 420                  * interrupt handler. */
 421                 smp_wmb();
 422
 423                 if (efx_dev_registered(efx))
 424                         netif_tx_lock_bh(efx->net_dev);
 425                 rc = efx_enqueue_skb(tx_queue, skb);
 426                 if (efx_dev_registered(efx))
 427                         netif_tx_unlock_bh(efx->net_dev);
 428
 429                 if (rc != NETDEV_TX_OK) {
 430                         EFX_ERR(efx, "TX queue %d could not transmit packet %d "
 431                                 "of %d in %s loopback test\n", tx_queue->queue,
 432                                 i + 1, state->packet_count, LOOPBACK_MODE(efx));
 433
 434                         /* Defer cleaning up the other skbs for the caller */
 435                         kfree_skb(skb);
 436                         return -EPIPE;
 437                 }
 438         }
 439
 440         return 0;
 441 }
 442
 443 static int efx_poll_loopback(struct efx_nic *efx)
 444 {
 445         struct efx_loopback_state *state = efx->loopback_selftest;
 446         struct efx_channel *channel;
 447
 448         /* NAPI polling is not enabled, so process channels
 449          * synchronously */
 450         efx_for_each_channel(channel, efx) {
 451                 if (channel->work_pending)
 452                         efx_process_channel_now(channel);
 453         }
 454         return atomic_read(&state->rx_good) == state->packet_count;
 455 }
 456
 457 static int efx_end_loopback(struct efx_tx_queue *tx_queue,
 458                             struct efx_loopback_self_tests *lb_tests)
 459 {
 460         struct efx_nic *efx = tx_queue->efx;
 461         struct efx_loopback_state *state = efx->loopback_selftest;
 462         struct sk_buff *skb;
 463         int tx_done = 0, rx_good, rx_bad;
 464         int i, rc = 0;
 465
 466         if (efx_dev_registered(efx))
 467                 netif_tx_lock_bh(efx->net_dev);
 468
 469         /* Count the number of tx completions, and decrement the refcnt. Any
 470          * skbs not already completed will be free'd when the queue is flushed */
 471         for (i=0; i < state->packet_count; i++) {
 472                 skb = state->skbs[i];
 473                 if (skb && !skb_shared(skb))
 474                         ++tx_done;
 475                 dev_kfree_skb_any(skb);
 476         }
 477
 478         if (efx_dev_registered(efx))
 479                 netif_tx_unlock_bh(efx->net_dev);
 480
 481         /* Check TX completion and received packet counts */
 482         rx_good = atomic_read(&state->rx_good);
 483         rx_bad = atomic_read(&state->rx_bad);
 484         if (tx_done != state->packet_count) {
 485                 /* Don't free the skbs; they will be picked up on TX
 486                  * overflow or channel teardown.
 487                  */
 488                 EFX_ERR(efx, "TX queue %d saw only %d out of an expected %d "
 489                         "TX completion events in %s loopback test\n",
 490                         tx_queue->queue, tx_done, state->packet_count,
 491                         LOOPBACK_MODE(efx));
 492                 rc = -ETIMEDOUT;
 493                 /* Allow to fall through so we see the RX errors as well */
 494         }
 495
 496         /* We may always be up to a flush away from our desired packet total */
 497         if (rx_good != state->packet_count) {
 498                 EFX_LOG(efx, "TX queue %d saw only %d out of an expected %d "
 499                         "received packets in %s loopback test\n",
 500                         tx_queue->queue, rx_good, state->packet_count,
 501                         LOOPBACK_MODE(efx));
 502                 rc = -ETIMEDOUT;
 503                 /* Fall through */
 504         }
 505
 506         /* Update loopback test structure */
 507         lb_tests->tx_sent[tx_queue->queue] += state->packet_count;
 508         lb_tests->tx_done[tx_queue->queue] += tx_done;
 509         lb_tests->rx_good += rx_good;
 510         lb_tests->rx_bad += rx_bad;
 511
 512         return rc;
 513 }
 514
 515 static int
 516 efx_test_loopback(struct efx_tx_queue *tx_queue,
 517                   struct efx_loopback_self_tests *lb_tests)
 518 {
 519         struct efx_nic *efx = tx_queue->efx;
 520         struct efx_loopback_state *state = efx->loopback_selftest;
 521         int i, begin_rc, end_rc;
 522
 523         for (i = 0; i < 3; i++) {
 524                 /* Determine how many packets to send */
 525                 state->packet_count = EFX_TXQ_SIZE / 3;
 526                 state->packet_count = min(1 << (i << 2), state->packet_count);
 527                 state->skbs = kzalloc(sizeof(state->skbs[0]) *
 528                                       state->packet_count, GFP_KERNEL);
 529                 if (!state->skbs)
 530                         return -ENOMEM;
 531                 state->flush = false;
 532
 533                 EFX_LOG(efx, "TX queue %d testing %s loopback with %d "
 534                         "packets\n", tx_queue->queue, LOOPBACK_MODE(efx),
 535                         state->packet_count);
 536
 537                 efx_iterate_state(efx);
 538                 begin_rc = efx_begin_loopback(tx_queue);
 539
 540                 /* This will normally complete very quickly, but be
 541                  * prepared to wait up to 100 ms. */
 542                 msleep(1);
 543                 if (!efx_poll_loopback(efx)) {
 544                         msleep(100);
 545                         efx_poll_loopback(efx);
 546                 }
 547
 548                 end_rc = efx_end_loopback(tx_queue, lb_tests);
 549                 kfree(state->skbs);
 550
 551                 if (begin_rc || end_rc) {
 552                         /* Wait a while to ensure there are no packets
 553                          * floating around after a failure. */
 554                         schedule_timeout_uninterruptible(HZ / 10);
 555                         return begin_rc ? begin_rc : end_rc;
 556                 }
 557         }
 558
 559         EFX_LOG(efx, "TX queue %d passed %s loopback test with a burst length "
 560                 "of %d packets\n", tx_queue->queue, LOOPBACK_MODE(efx),
 561                 state->packet_count);
 562
 563         return 0;
 564 }
 565
 566 static int efx_test_loopbacks(struct efx_nic *efx, struct efx_self_tests *tests,
 567                               unsigned int loopback_modes)
 568 {
 569         enum efx_loopback_mode mode;
 570         struct efx_loopback_state *state;
 571         struct efx_tx_queue *tx_queue;
 572         bool link_up;
 573         int count, rc = 0;
 574
 575         /* Set the port loopback_selftest member. From this point on
 576          * all received packets will be dropped. Mark the state as
 577          * "flushing" so all inflight packets are dropped */
 578         state = kzalloc(sizeof(*state), GFP_KERNEL);
 579         if (state == NULL)
 580                 return -ENOMEM;
 581         BUG_ON(efx->loopback_selftest);
 582         state->flush = true;
 583         efx->loopback_selftest = state;
 584
 585         /* Test all supported loopback modes */
 586         for (mode = LOOPBACK_NONE; mode <= LOOPBACK_TEST_MAX; mode++) {
 587                 if (!(loopback_modes & (1 << mode)))
 588                         continue;
 589
 590                 /* Move the port into the specified loopback mode. */
 591                 state->flush = true;
 592                 efx->loopback_mode = mode;
 593                 efx_reconfigure_port(efx);
 594
 595                 /* Wait for the PHY to signal the link is up. Interrupts
 596                  * are enabled for PHY's using LASI, otherwise we poll()
 597                  * quickly */
 598                 count = 0;
 599                 do {
 600                         struct efx_channel *channel = &efx->channel[0];
 601
 602                         efx->phy_op->poll(efx);
 603                         schedule_timeout_uninterruptible(HZ / 10);
 604                         if (channel->work_pending)
 605                                 efx_process_channel_now(channel);
 606                         /* Wait for PHY events to be processed */
 607                         flush_workqueue(efx->workqueue);
 608                         rmb();
 609
 610                         /* We need both the PHY and MAC-PHY links to be OK */
 611                         link_up = efx->link_state.up;
 612                         if (link_up)
 613                                 link_up = !efx->mac_op->check_fault(efx);
 614
 615                 } while ((++count < 20) && !link_up);
 616
 617                 /* The link should now be up. If it isn't, there is no point
 618                  * in attempting a loopback test */
 619                 if (!link_up) {
 620                         EFX_ERR(efx, "loopback %s never came up\n",
 621                                 LOOPBACK_MODE(efx));
 622                         rc = -EIO;
 623                         goto out;
 624                 }
 625
 626                 EFX_LOG(efx, "link came up in %s loopback in %d iterations\n",
 627                         LOOPBACK_MODE(efx), count);
 628
 629                 /* Test every TX queue */
 630                 efx_for_each_tx_queue(tx_queue, efx) {
 631                         state->offload_csum = (tx_queue->queue ==
 632                                                EFX_TX_QUEUE_OFFLOAD_CSUM);
 633                         rc = efx_test_loopback(tx_queue,
 634                                                &tests->loopback[mode]);
 635                         if (rc)
 636                                 goto out;
 637                 }
 638         }
 639
 640  out:
 641         /* Remove the flush. The caller will remove the loopback setting */
 642         state->flush = true;
 643         efx->loopback_selftest = NULL;
 644         wmb();
 645         kfree(state);
 646
 647         return rc;
 648 }
 649
 650 /**************************************************************************
 651  *
 652  * Entry point
 653  *
 654  *************************************************************************/
 655
 656 int efx_selftest(struct efx_nic *efx, struct efx_self_tests *tests,
 657                  unsigned flags)
 658 {
 659         enum efx_loopback_mode loopback_mode = efx->loopback_mode;
 660         int phy_mode = efx->phy_mode;
 661         enum reset_type reset_method = RESET_TYPE_INVISIBLE;
 662         struct ethtool_cmd ecmd;
 663         struct efx_channel *channel;
 664         int rc_test = 0, rc_reset = 0, rc;
 665
 666         /* Online (i.e. non-disruptive) testing
 667          * This checks interrupt generation, event delivery and PHY presence. */
 668
 669         rc = efx_test_mdio(efx, tests);
 670         if (rc && !rc_test)
 671                 rc_test = rc;
 672
 673         rc = efx_test_nvram(efx, tests);
 674         if (rc && !rc_test)
 675                 rc_test = rc;
 676
 677         rc = efx_test_interrupts(efx, tests);
 678         if (rc && !rc_test)
 679                 rc_test = rc;
 680
 681         efx_for_each_channel(channel, efx) {
 682                 rc = efx_test_eventq_irq(channel, tests);
 683                 if (rc && !rc_test)
 684                         rc_test = rc;
 685         }
 686
 687         if (rc_test)
 688                 return rc_test;
 689
 690         if (!(flags & ETH_TEST_FL_OFFLINE))
 691                 return efx_test_phy(efx, tests, flags);
 692
 693         /* Offline (i.e. disruptive) testing
 694          * This checks MAC and PHY loopback on the specified port. */
 695
 696         /* force the carrier state off so the kernel doesn't transmit during
 697          * the loopback test, and the watchdog timeout doesn't fire. Also put
 698          * falcon into loopback for the register test.
 699          */
 700         mutex_lock(&efx->mac_lock);
 701         efx->port_inhibited = true;
 702         if (efx->loopback_modes) {
 703                 /* We need the 312 clock from the PHY to test the XMAC
 704                  * registers, so move into XGMII loopback if available */
 705                 if (efx->loopback_modes & (1 << LOOPBACK_XGMII))
 706                         efx->loopback_mode = LOOPBACK_XGMII;
 707                 else
 708                         efx->loopback_mode = __ffs(efx->loopback_modes);
 709         }
 710
 711         __efx_reconfigure_port(efx);
 712         mutex_unlock(&efx->mac_lock);
 713
 714         /* free up all consumers of SRAM (including all the queues) */
 715         efx_reset_down(efx, reset_method, &ecmd);
 716
 717         rc = efx_test_chip(efx, tests);
 718         if (rc && !rc_test)
 719                 rc_test = rc;
 720
 721         /* reset the chip to recover from the register test */
 722         rc_reset = efx->type->reset(efx, reset_method);
 723
 724         /* Ensure that the phy is powered and out of loopback
 725          * for the bist and loopback tests */
 726         efx->phy_mode &= ~PHY_MODE_LOW_POWER;
 727         efx->loopback_mode = LOOPBACK_NONE;
 728
 729         rc = efx_reset_up(efx, reset_method, &ecmd, rc_reset == 0);
 730         if (rc && !rc_reset)
 731                 rc_reset = rc;
 732
 733         if (rc_reset) {
 734                 EFX_ERR(efx, "Unable to recover from chip test\n");
 735                 efx_schedule_reset(efx, RESET_TYPE_DISABLE);
 736                 return rc_reset;
 737         }
 738
 739         rc = efx_test_phy(efx, tests, flags);
 740         if (rc && !rc_test)
 741                 rc_test = rc;
 742
 743         rc = efx_test_loopbacks(efx, tests, efx->loopback_modes);
 744         if (rc && !rc_test)
 745                 rc_test = rc;
 746
 747         /* restore the PHY to the previous state */
 748         efx->loopback_mode = loopback_mode;
 749         efx->phy_mode = phy_mode;
 750         efx->port_inhibited = false;
 751         efx_ethtool_set_settings(efx->net_dev, &ecmd);
 752
 753         return rc_test;
 754 }
 755