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  * @rx_good:            RX good packet count
  59  * @rx_bad:             RX bad packet count
  60  * @payload:            Payload used in tests
  61  */
  62 struct efx_loopback_state {
  63         bool flush;
  64         int packet_count;
  65         struct sk_buff **skbs;
  66
  67         /* Checksums are being offloaded */
  68         bool offload_csum;
  69
  70         atomic_t rx_good;
  71         atomic_t rx_bad;
  72         struct efx_loopback_payload payload;
  73 };
  74
  75 /**************************************************************************
  76  *
  77  * MII, NVRAM and register tests
  78  *
  79  **************************************************************************/
  80
  81 static int efx_test_mdio(struct efx_nic *efx, struct efx_self_tests *tests)
  82 {
  83         int rc = 0;
  84         int devad = __ffs(efx->mdio.mmds);
  85         u16 physid1, physid2;
  86
  87         if (efx->phy_type == PHY_TYPE_NONE)
  88                 return 0;
  89
  90         mutex_lock(&efx->mac_lock);
  91         tests->mdio = -1;
  92
  93         physid1 = efx_mdio_read(efx, devad, MDIO_DEVID1);
  94         physid2 = efx_mdio_read(efx, devad, MDIO_DEVID2);
  95
  96         if ((physid1 == 0x0000) || (physid1 == 0xffff) ||
  97             (physid2 == 0x0000) || (physid2 == 0xffff)) {
  98                 EFX_ERR(efx, "no MDIO PHY present with ID %d\n",
  99                         efx->mdio.prtad);
 100                 rc = -EINVAL;
 101                 goto out;
 102         }
 103
 104         if (EFX_IS10G(efx)) {
 105                 rc = efx_mdio_check_mmds(efx, efx->phy_op->mmds, 0);
 106                 if (rc)
 107                         goto out;
 108         }
 109
 110 out:
 111         mutex_unlock(&efx->mac_lock);
 112         tests->mdio = rc ? -1 : 1;
 113         return rc;
 114 }
 115
 116 static int efx_test_nvram(struct efx_nic *efx, struct efx_self_tests *tests)
 117 {
 118         int rc;
 119
 120         rc = falcon_read_nvram(efx, NULL);
 121         tests->nvram = rc ? -1 : 1;
 122         return rc;
 123 }
 124
 125 static int efx_test_chip(struct efx_nic *efx, struct efx_self_tests *tests)
 126 {
 127         int rc;
 128
 129         /* Not supported on A-series silicon */
 130         if (falcon_rev(efx) < FALCON_REV_B0)
 131                 return 0;
 132
 133         rc = falcon_test_registers(efx);
 134         tests->registers = rc ? -1 : 1;
 135         return rc;
 136 }
 137
 138 /**************************************************************************
 139  *
 140  * Interrupt and event queue testing
 141  *
 142  **************************************************************************/
 143
 144 /* Test generation and receipt of interrupts */
 145 static int efx_test_interrupts(struct efx_nic *efx,
 146                                struct efx_self_tests *tests)
 147 {
 148         struct efx_channel *channel;
 149
 150         EFX_LOG(efx, "testing interrupts\n");
 151         tests->interrupt = -1;
 152
 153         /* Reset interrupt flag */
 154         efx->last_irq_cpu = -1;
 155         smp_wmb();
 156
 157         /* ACK each interrupting event queue. Receiving an interrupt due to
 158          * traffic before a test event is raised is considered a pass */
 159         efx_for_each_channel(channel, efx) {
 160                 if (channel->work_pending)
 161                         efx_process_channel_now(channel);
 162                 if (efx->last_irq_cpu >= 0)
 163                         goto success;
 164         }
 165
 166         falcon_generate_interrupt(efx);
 167
 168         /* Wait for arrival of test interrupt. */
 169         EFX_LOG(efx, "waiting for test interrupt\n");
 170         schedule_timeout_uninterruptible(HZ / 10);
 171         if (efx->last_irq_cpu >= 0)
 172                 goto success;
 173
 174         EFX_ERR(efx, "timed out waiting for interrupt\n");
 175         return -ETIMEDOUT;
 176
 177  success:
 178         EFX_LOG(efx, "%s test interrupt seen on CPU%d\n", INT_MODE(efx),
 179                 efx->last_irq_cpu);
 180         tests->interrupt = 1;
 181         return 0;
 182 }
 183
 184 /* Test generation and receipt of interrupting events */
 185 static int efx_test_eventq_irq(struct efx_channel *channel,
 186                                struct efx_self_tests *tests)
 187 {
 188         unsigned int magic, count;
 189
 190         /* Channel specific code, limited to 20 bits */
 191         magic = (0x00010150 + channel->channel);
 192         EFX_LOG(channel->efx, "channel %d testing event queue with code %x\n",
 193                 channel->channel, magic);
 194
 195         tests->eventq_dma[channel->channel] = -1;
 196         tests->eventq_int[channel->channel] = -1;
 197         tests->eventq_poll[channel->channel] = -1;
 198
 199         /* Reset flag and zero magic word */
 200         channel->efx->last_irq_cpu = -1;
 201         channel->eventq_magic = 0;
 202         smp_wmb();
 203
 204         falcon_generate_test_event(channel, magic);
 205
 206         /* Wait for arrival of interrupt */
 207         count = 0;
 208         do {
 209                 schedule_timeout_uninterruptible(HZ / 100);
 210
 211                 if (channel->work_pending)
 212                         efx_process_channel_now(channel);
 213
 214                 if (channel->eventq_magic == magic)
 215                         goto eventq_ok;
 216         } while (++count < 2);
 217
 218         EFX_ERR(channel->efx, "channel %d timed out waiting for event queue\n",
 219                 channel->channel);
 220
 221         /* See if interrupt arrived */
 222         if (channel->efx->last_irq_cpu >= 0) {
 223                 EFX_ERR(channel->efx, "channel %d saw interrupt on CPU%d "
 224                         "during event queue test\n", channel->channel,
 225                         raw_smp_processor_id());
 226                 tests->eventq_int[channel->channel] = 1;
 227         }
 228
 229         /* Check to see if event was received even if interrupt wasn't */
 230         efx_process_channel_now(channel);
 231         if (channel->eventq_magic == magic) {
 232                 EFX_ERR(channel->efx, "channel %d event was generated, but "
 233                         "failed to trigger an interrupt\n", channel->channel);
 234                 tests->eventq_dma[channel->channel] = 1;
 235         }
 236
 237         return -ETIMEDOUT;
 238  eventq_ok:
 239         EFX_LOG(channel->efx, "channel %d event queue passed\n",
 240                 channel->channel);
 241         tests->eventq_dma[channel->channel] = 1;
 242         tests->eventq_int[channel->channel] = 1;
 243         tests->eventq_poll[channel->channel] = 1;
 244         return 0;
 245 }
 246
 247 static int efx_test_phy(struct efx_nic *efx, struct efx_self_tests *tests,
 248                         unsigned flags)
 249 {
 250         int rc;
 251
 252         if (!efx->phy_op->run_tests)
 253                 return 0;
 254
 255         EFX_BUG_ON_PARANOID(efx->phy_op->num_tests == 0 ||
 256                             efx->phy_op->num_tests > EFX_MAX_PHY_TESTS);
 257
 258         mutex_lock(&efx->mac_lock);
 259         rc = efx->phy_op->run_tests(efx, tests->phy, flags);
 260         mutex_unlock(&efx->mac_lock);
 261         return rc;
 262 }
 263
 264 /**************************************************************************
 265  *
 266  * Loopback testing
 267  * NB Only one loopback test can be executing concurrently.
 268  *
 269  **************************************************************************/
 270
 271 /* Loopback test RX callback
 272  * This is called for each received packet during loopback testing.
 273  */
 274 void efx_loopback_rx_packet(struct efx_nic *efx,
 275                             const char *buf_ptr, int pkt_len)
 276 {
 277         struct efx_loopback_state *state = efx->loopback_selftest;
 278         struct efx_loopback_payload *received;
 279         struct efx_loopback_payload *payload;
 280
 281         BUG_ON(!buf_ptr);
 282
 283         /* If we are just flushing, then drop the packet */
 284         if ((state == NULL) || state->flush)
 285                 return;
 286
 287         payload = &state->payload;
 288
 289         received = (struct efx_loopback_payload *) buf_ptr;
 290         received->ip.saddr = payload->ip.saddr;
 291         if (state->offload_csum)
 292                 received->ip.check = payload->ip.check;
 293
 294         /* Check that header exists */
 295         if (pkt_len < sizeof(received->header)) {
 296                 EFX_ERR(efx, "saw runt RX packet (length %d) in %s loopback "
 297                         "test\n", pkt_len, LOOPBACK_MODE(efx));
 298                 goto err;
 299         }
 300
 301         /* Check that the ethernet header exists */
 302         if (memcmp(&received->header, &payload->header, ETH_HLEN) != 0) {
 303                 EFX_ERR(efx, "saw non-loopback RX packet in %s loopback test\n",
 304                         LOOPBACK_MODE(efx));
 305                 goto err;
 306         }
 307
 308         /* Check packet length */
 309         if (pkt_len != sizeof(*payload)) {
 310                 EFX_ERR(efx, "saw incorrect RX packet length %d (wanted %d) in "
 311                         "%s loopback test\n", pkt_len, (int)sizeof(*payload),
 312                         LOOPBACK_MODE(efx));
 313                 goto err;
 314         }
 315
 316         /* Check that IP header matches */
 317         if (memcmp(&received->ip, &payload->ip, sizeof(payload->ip)) != 0) {
 318                 EFX_ERR(efx, "saw corrupted IP header in %s loopback test\n",
 319                         LOOPBACK_MODE(efx));
 320                 goto err;
 321         }
 322
 323         /* Check that msg and padding matches */
 324         if (memcmp(&received->msg, &payload->msg, sizeof(received->msg)) != 0) {
 325                 EFX_ERR(efx, "saw corrupted RX packet in %s loopback test\n",
 326                         LOOPBACK_MODE(efx));
 327                 goto err;
 328         }
 329
 330         /* Check that iteration matches */
 331         if (received->iteration != payload->iteration) {
 332                 EFX_ERR(efx, "saw RX packet from iteration %d (wanted %d) in "
 333                         "%s loopback test\n", ntohs(received->iteration),
 334                         ntohs(payload->iteration), LOOPBACK_MODE(efx));
 335                 goto err;
 336         }
 337
 338         /* Increase correct RX count */
 339         EFX_TRACE(efx, "got loopback RX in %s loopback test\n",
 340                   LOOPBACK_MODE(efx));
 341
 342         atomic_inc(&state->rx_good);
 343         return;
 344
 345  err:
 346 #ifdef EFX_ENABLE_DEBUG
 347         if (atomic_read(&state->rx_bad) == 0) {
 348                 EFX_ERR(efx, "received packet:\n");
 349                 print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 0x10, 1,
 350                                buf_ptr, pkt_len, 0);
 351                 EFX_ERR(efx, "expected packet:\n");
 352                 print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 0x10, 1,
 353                                &state->payload, sizeof(state->payload), 0);
 354         }
 355 #endif
 356         atomic_inc(&state->rx_bad);
 357 }
 358
 359 /* Initialise an efx_selftest_state for a new iteration */
 360 static void efx_iterate_state(struct efx_nic *efx)
 361 {
 362         struct efx_loopback_state *state = efx->loopback_selftest;
 363         struct net_device *net_dev = efx->net_dev;
 364         struct efx_loopback_payload *payload = &state->payload;
 365
 366         /* Initialise the layerII header */
 367         memcpy(&payload->header.h_dest, net_dev->dev_addr, ETH_ALEN);
 368         memcpy(&payload->header.h_source, &payload_source, ETH_ALEN);
 369         payload->header.h_proto = htons(ETH_P_IP);
 370
 371         /* saddr set later and used as incrementing count */
 372         payload->ip.daddr = htonl(INADDR_LOOPBACK);
 373         payload->ip.ihl = 5;
 374         payload->ip.check = htons(0xdead);
 375         payload->ip.tot_len = htons(sizeof(*payload) - sizeof(struct ethhdr));
 376         payload->ip.version = IPVERSION;
 377         payload->ip.protocol = IPPROTO_UDP;
 378
 379         /* Initialise udp header */
 380         payload->udp.source = 0;
 381         payload->udp.len = htons(sizeof(*payload) - sizeof(struct ethhdr) -
 382                                  sizeof(struct iphdr));
 383         payload->udp.check = 0; /* checksum ignored */
 384
 385         /* Fill out payload */
 386         payload->iteration = htons(ntohs(payload->iteration) + 1);
 387         memcpy(&payload->msg, payload_msg, sizeof(payload_msg));
 388
 389         /* Fill out remaining state members */
 390         atomic_set(&state->rx_good, 0);
 391         atomic_set(&state->rx_bad, 0);
 392         smp_wmb();
 393 }
 394
 395 static int efx_begin_loopback(struct efx_tx_queue *tx_queue)
 396 {
 397         struct efx_nic *efx = tx_queue->efx;
 398         struct efx_loopback_state *state = efx->loopback_selftest;
 399         struct efx_loopback_payload *payload;
 400         struct sk_buff *skb;
 401         int i;
 402         netdev_tx_t rc;
 403
 404         /* Transmit N copies of buffer */
 405         for (i = 0; i < state->packet_count; i++) {
 406                 /* Allocate an skb, holding an extra reference for
 407                  * transmit completion counting */
 408                 skb = alloc_skb(sizeof(state->payload), GFP_KERNEL);
 409                 if (!skb)
 410                         return -ENOMEM;
 411                 state->skbs[i] = skb;
 412                 skb_get(skb);
 413
 414                 /* Copy the payload in, incrementing the source address to
 415                  * exercise the rss vectors */
 416                 payload = ((struct efx_loopback_payload *)
 417                            skb_put(skb, sizeof(state->payload)));
 418                 memcpy(payload, &state->payload, sizeof(state->payload));
 419                 payload->ip.saddr = htonl(INADDR_LOOPBACK | (i << 2));
 420
 421                 /* Ensure everything we've written is visible to the
 422                  * interrupt handler. */
 423                 smp_wmb();
 424
 425                 if (efx_dev_registered(efx))
 426                         netif_tx_lock_bh(efx->net_dev);
 427                 rc = efx_enqueue_skb(tx_queue, skb);
 428                 if (efx_dev_registered(efx))
 429                         netif_tx_unlock_bh(efx->net_dev);
 430
 431                 if (rc != NETDEV_TX_OK) {
 432                         EFX_ERR(efx, "TX queue %d could not transmit packet %d "
 433                                 "of %d in %s loopback test\n", tx_queue->queue,
 434                                 i + 1, state->packet_count, LOOPBACK_MODE(efx));
 435
 436                         /* Defer cleaning up the other skbs for the caller */
 437                         kfree_skb(skb);
 438                         return -EPIPE;
 439                 }
 440                 efx->net_dev->trans_start = jiffies;
 441         }
 442
 443         return 0;
 444 }
 445
 446 static int efx_poll_loopback(struct efx_nic *efx)
 447 {
 448         struct efx_loopback_state *state = efx->loopback_selftest;
 449         struct efx_channel *channel;
 450
 451         /* NAPI polling is not enabled, so process channels
 452          * synchronously */
 453         efx_for_each_channel(channel, efx) {
 454                 if (channel->work_pending)
 455                         efx_process_channel_now(channel);
 456         }
 457         return atomic_read(&state->rx_good) == state->packet_count;
 458 }
 459
 460 static int efx_end_loopback(struct efx_tx_queue *tx_queue,
 461                             struct efx_loopback_self_tests *lb_tests)
 462 {
 463         struct efx_nic *efx = tx_queue->efx;
 464         struct efx_loopback_state *state = efx->loopback_selftest;
 465         struct sk_buff *skb;
 466         int tx_done = 0, rx_good, rx_bad;
 467         int i, rc = 0;
 468
 469         if (efx_dev_registered(efx))
 470                 netif_tx_lock_bh(efx->net_dev);
 471
 472         /* Count the number of tx completions, and decrement the refcnt. Any
 473          * skbs not already completed will be free'd when the queue is flushed */
 474         for (i=0; i < state->packet_count; i++) {
 475                 skb = state->skbs[i];
 476                 if (skb && !skb_shared(skb))
 477                         ++tx_done;
 478                 dev_kfree_skb_any(skb);
 479         }
 480
 481         if (efx_dev_registered(efx))
 482                 netif_tx_unlock_bh(efx->net_dev);
 483
 484         /* Check TX completion and received packet counts */
 485         rx_good = atomic_read(&state->rx_good);
 486         rx_bad = atomic_read(&state->rx_bad);
 487         if (tx_done != state->packet_count) {
 488                 /* Don't free the skbs; they will be picked up on TX
 489                  * overflow or channel teardown.
 490                  */
 491                 EFX_ERR(efx, "TX queue %d saw only %d out of an expected %d "
 492                         "TX completion events in %s loopback test\n",
 493                         tx_queue->queue, tx_done, state->packet_count,
 494                         LOOPBACK_MODE(efx));
 495                 rc = -ETIMEDOUT;
 496                 /* Allow to fall through so we see the RX errors as well */
 497         }
 498
 499         /* We may always be up to a flush away from our desired packet total */
 500         if (rx_good != state->packet_count) {
 501                 EFX_LOG(efx, "TX queue %d saw only %d out of an expected %d "
 502                         "received packets in %s loopback test\n",
 503                         tx_queue->queue, rx_good, state->packet_count,
 504                         LOOPBACK_MODE(efx));
 505                 rc = -ETIMEDOUT;
 506                 /* Fall through */
 507         }
 508
 509         /* Update loopback test structure */
 510         lb_tests->tx_sent[tx_queue->queue] += state->packet_count;
 511         lb_tests->tx_done[tx_queue->queue] += tx_done;
 512         lb_tests->rx_good += rx_good;
 513         lb_tests->rx_bad += rx_bad;
 514
 515         return rc;
 516 }
 517
 518 static int
 519 efx_test_loopback(struct efx_tx_queue *tx_queue,
 520                   struct efx_loopback_self_tests *lb_tests)
 521 {
 522         struct efx_nic *efx = tx_queue->efx;
 523         struct efx_loopback_state *state = efx->loopback_selftest;
 524         int i, begin_rc, end_rc;
 525
 526         for (i = 0; i < 3; i++) {
 527                 /* Determine how many packets to send */
 528                 state->packet_count = EFX_TXQ_SIZE / 3;
 529                 state->packet_count = min(1 << (i << 2), state->packet_count);
 530                 state->skbs = kzalloc(sizeof(state->skbs[0]) *
 531                                       state->packet_count, GFP_KERNEL);
 532                 if (!state->skbs)
 533                         return -ENOMEM;
 534                 state->flush = false;
 535
 536                 EFX_LOG(efx, "TX queue %d testing %s loopback with %d "
 537                         "packets\n", tx_queue->queue, LOOPBACK_MODE(efx),
 538                         state->packet_count);
 539
 540                 efx_iterate_state(efx);
 541                 begin_rc = efx_begin_loopback(tx_queue);
 542
 543                 /* This will normally complete very quickly, but be
 544                  * prepared to wait up to 100 ms. */
 545                 msleep(1);
 546                 if (!efx_poll_loopback(efx)) {
 547                         msleep(100);
 548                         efx_poll_loopback(efx);
 549                 }
 550
 551                 end_rc = efx_end_loopback(tx_queue, lb_tests);
 552                 kfree(state->skbs);
 553
 554                 if (begin_rc || end_rc) {
 555                         /* Wait a while to ensure there are no packets
 556                          * floating around after a failure. */
 557                         schedule_timeout_uninterruptible(HZ / 10);
 558                         return begin_rc ? begin_rc : end_rc;
 559                 }
 560         }
 561
 562         EFX_LOG(efx, "TX queue %d passed %s loopback test with a burst length "
 563                 "of %d packets\n", tx_queue->queue, LOOPBACK_MODE(efx),
 564                 state->packet_count);
 565
 566         return 0;
 567 }
 568
 569 static int efx_test_loopbacks(struct efx_nic *efx, struct efx_self_tests *tests,
 570                               unsigned int loopback_modes)
 571 {
 572         enum efx_loopback_mode mode;
 573         struct efx_loopback_state *state;
 574         struct efx_tx_queue *tx_queue;
 575         bool link_up;
 576         int count, rc = 0;
 577
 578         /* Set the port loopback_selftest member. From this point on
 579          * all received packets will be dropped. Mark the state as
 580          * "flushing" so all inflight packets are dropped */
 581         state = kzalloc(sizeof(*state), GFP_KERNEL);
 582         if (state == NULL)
 583                 return -ENOMEM;
 584         BUG_ON(efx->loopback_selftest);
 585         state->flush = true;
 586         efx->loopback_selftest = state;
 587
 588         /* Test all supported loopback modes */
 589         for (mode = LOOPBACK_NONE; mode <= LOOPBACK_TEST_MAX; mode++) {
 590                 if (!(loopback_modes & (1 << mode)))
 591                         continue;
 592
 593                 /* Move the port into the specified loopback mode. */
 594                 state->flush = true;
 595                 efx->loopback_mode = mode;
 596                 efx_reconfigure_port(efx);
 597
 598                 /* Wait for the PHY to signal the link is up. Interrupts
 599                  * are enabled for PHY's using LASI, otherwise we poll()
 600                  * quickly */
 601                 count = 0;
 602                 do {
 603                         struct efx_channel *channel = &efx->channel[0];
 604
 605                         efx->phy_op->poll(efx);
 606                         schedule_timeout_uninterruptible(HZ / 10);
 607                         if (channel->work_pending)
 608                                 efx_process_channel_now(channel);
 609                         /* Wait for PHY events to be processed */
 610                         flush_workqueue(efx->workqueue);
 611                         rmb();
 612
 613                         /* We need both the PHY and MAC-PHY links to be OK */
 614                         link_up = efx->link_state.up;
 615                         if (link_up)
 616                                 link_up = !efx->mac_op->check_fault(efx);
 617
 618                 } while ((++count < 20) && !link_up);
 619
 620                 /* The link should now be up. If it isn't, there is no point
 621                  * in attempting a loopback test */
 622                 if (!link_up) {
 623                         EFX_ERR(efx, "loopback %s never came up\n",
 624                                 LOOPBACK_MODE(efx));
 625                         rc = -EIO;
 626                         goto out;
 627                 }
 628
 629                 EFX_LOG(efx, "link came up in %s loopback in %d iterations\n",
 630                         LOOPBACK_MODE(efx), count);
 631
 632                 /* Test every TX queue */
 633                 efx_for_each_tx_queue(tx_queue, efx) {
 634                         state->offload_csum = (tx_queue->queue ==
 635                                                EFX_TX_QUEUE_OFFLOAD_CSUM);
 636                         rc = efx_test_loopback(tx_queue,
 637                                                &tests->loopback[mode]);
 638                         if (rc)
 639                                 goto out;
 640                 }
 641         }
 642
 643  out:
 644         /* Remove the flush. The caller will remove the loopback setting */
 645         state->flush = true;
 646         efx->loopback_selftest = NULL;
 647         wmb();
 648         kfree(state);
 649
 650         return rc;
 651 }
 652
 653 /**************************************************************************
 654  *
 655  * Entry point
 656  *
 657  *************************************************************************/
 658
 659 int efx_selftest(struct efx_nic *efx, struct efx_self_tests *tests,
 660                  unsigned flags)
 661 {
 662         enum efx_loopback_mode loopback_mode = efx->loopback_mode;
 663         int phy_mode = efx->phy_mode;
 664         enum reset_type reset_method = RESET_TYPE_INVISIBLE;
 665         struct ethtool_cmd ecmd;
 666         struct efx_channel *channel;
 667         int rc_test = 0, rc_reset = 0, rc;
 668
 669         /* Online (i.e. non-disruptive) testing
 670          * This checks interrupt generation, event delivery and PHY presence. */
 671
 672         rc = efx_test_mdio(efx, tests);
 673         if (rc && !rc_test)
 674                 rc_test = rc;
 675
 676         rc = efx_test_nvram(efx, tests);
 677         if (rc && !rc_test)
 678                 rc_test = rc;
 679
 680         rc = efx_test_interrupts(efx, tests);
 681         if (rc && !rc_test)
 682                 rc_test = rc;
 683
 684         efx_for_each_channel(channel, efx) {
 685                 rc = efx_test_eventq_irq(channel, tests);
 686                 if (rc && !rc_test)
 687                         rc_test = rc;
 688         }
 689
 690         if (rc_test)
 691                 return rc_test;
 692
 693         if (!(flags & ETH_TEST_FL_OFFLINE))
 694                 return efx_test_phy(efx, tests, flags);
 695
 696         /* Offline (i.e. disruptive) testing
 697          * This checks MAC and PHY loopback on the specified port. */
 698
 699         /* force the carrier state off so the kernel doesn't transmit during
 700          * the loopback test, and the watchdog timeout doesn't fire. Also put
 701          * falcon into loopback for the register test.
 702          */
 703         mutex_lock(&efx->mac_lock);
 704         efx->port_inhibited = true;
 705         if (efx->loopback_modes) {
 706                 /* We need the 312 clock from the PHY to test the XMAC
 707                  * registers, so move into XGMII loopback if available */
 708                 if (efx->loopback_modes & (1 << LOOPBACK_XGMII))
 709                         efx->loopback_mode = LOOPBACK_XGMII;
 710                 else
 711                         efx->loopback_mode = __ffs(efx->loopback_modes);
 712         }
 713
 714         __efx_reconfigure_port(efx);
 715         mutex_unlock(&efx->mac_lock);
 716
 717         /* free up all consumers of SRAM (including all the queues) */
 718         efx_reset_down(efx, reset_method, &ecmd);
 719
 720         rc = efx_test_chip(efx, tests);
 721         if (rc && !rc_test)
 722                 rc_test = rc;
 723
 724         /* reset the chip to recover from the register test */
 725         rc_reset = falcon_reset_hw(efx, reset_method);
 726
 727         /* Ensure that the phy is powered and out of loopback
 728          * for the bist and loopback tests */
 729         efx->phy_mode &= ~PHY_MODE_LOW_POWER;
 730         efx->loopback_mode = LOOPBACK_NONE;
 731
 732         rc = efx_reset_up(efx, reset_method, &ecmd, rc_reset == 0);
 733         if (rc && !rc_reset)
 734                 rc_reset = rc;
 735
 736         if (rc_reset) {
 737                 EFX_ERR(efx, "Unable to recover from chip test\n");
 738                 efx_schedule_reset(efx, RESET_TYPE_DISABLE);
 739                 return rc_reset;
 740         }
 741
 742         rc = efx_test_phy(efx, tests, flags);
 743         if (rc && !rc_test)
 744                 rc_test = rc;
 745
 746         rc = efx_test_loopbacks(efx, tests, efx->loopback_modes);
 747         if (rc && !rc_test)
 748                 rc_test = rc;
 749
 750         /* restore the PHY to the previous state */
 751         efx->loopback_mode = loopback_mode;
 752         efx->phy_mode = phy_mode;
 753         efx->port_inhibited = false;
 754         efx_ethtool_set_settings(efx->net_dev, &ecmd);
 755
 756         return rc_test;
 757 }
 758