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 "ethtool.h"
  24 #include "efx.h"
  25 #include "falcon.h"
  26 #include "selftest.h"
  27 #include "workarounds.h"
  28 #include "spi.h"
  29 #include "io.h"
  30 #include "mdio_10g.h"
  31
  32 /*
  33  * Loopback test packet structure
  34  *
  35  * The self-test should stress every RSS vector, and unfortunately
  36  * Falcon only performs RSS on TCP/UDP packets.
  37  */
  38 struct efx_loopback_payload {
  39         struct ethhdr header;
  40         struct iphdr ip;
  41         struct udphdr udp;
  42         __be16 iteration;
  43         const char msg[64];
  44 } __attribute__ ((packed));
  45
  46 /* Loopback test source MAC address */
  47 static const unsigned char payload_source[ETH_ALEN] = {
  48         0x00, 0x0f, 0x53, 0x1b, 0x1b, 0x1b,
  49 };
  50
  51 static const char *payload_msg =
  52         "Hello world! This is an Efx loopback test in progress!";
  53
  54 /**
  55  * efx_loopback_state - persistent state during a loopback selftest
  56  * @flush:              Drop all packets in efx_loopback_rx_packet
  57  * @packet_count:       Number of packets being used in this test
  58  * @skbs:               An array of skbs transmitted
  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
  68         /* Checksums are being offloaded */
  69         bool offload_csum;
  70
  71         atomic_t rx_good;
  72         atomic_t rx_bad;
  73         struct efx_loopback_payload payload;
  74 };
  75
  76 /**************************************************************************
  77  *
  78  * MII, NVRAM and register tests
  79  *
  80  **************************************************************************/
  81
  82 static int efx_test_mdio(struct efx_nic *efx, struct efx_self_tests *tests)
  83 {
  84         int rc = 0;
  85         int devad = __ffs(efx->mdio.mmds);
  86         u16 physid1, physid2;
  87
  88         if (efx->phy_type == PHY_TYPE_NONE)
  89                 return 0;
  90
  91         mutex_lock(&efx->mac_lock);
  92         tests->mdio = -1;
  93
  94         physid1 = efx_mdio_read(efx, devad, MDIO_DEVID1);
  95         physid2 = efx_mdio_read(efx, devad, MDIO_DEVID2);
  96
  97         if ((physid1 == 0x0000) || (physid1 == 0xffff) ||
  98             (physid2 == 0x0000) || (physid2 == 0xffff)) {
  99                 EFX_ERR(efx, "no MDIO PHY present with ID %d\n",
 100                         efx->mdio.prtad);
 101                 rc = -EINVAL;
 102                 goto out;
 103         }
 104
 105         if (EFX_IS10G(efx)) {
 106                 rc = efx_mdio_check_mmds(efx, efx->phy_op->mmds, 0);
 107                 if (rc)
 108                         goto out;
 109         }
 110
 111 out:
 112         mutex_unlock(&efx->mac_lock);
 113         tests->mdio = rc ? -1 : 1;
 114         return rc;
 115 }
 116
 117 static int efx_test_nvram(struct efx_nic *efx, struct efx_self_tests *tests)
 118 {
 119         int rc;
 120
 121         rc = falcon_read_nvram(efx, NULL);
 122         tests->nvram = rc ? -1 : 1;
 123         return rc;
 124 }
 125
 126 static int efx_test_chip(struct efx_nic *efx, struct efx_self_tests *tests)
 127 {
 128         int rc;
 129
 130         /* Not supported on A-series silicon */
 131         if (falcon_rev(efx) < FALCON_REV_B0)
 132                 return 0;
 133
 134         rc = falcon_test_registers(efx);
 135         tests->registers = rc ? -1 : 1;
 136         return rc;
 137 }
 138
 139 /**************************************************************************
 140  *
 141  * Interrupt and event queue testing
 142  *
 143  **************************************************************************/
 144
 145 /* Test generation and receipt of interrupts */
 146 static int efx_test_interrupts(struct efx_nic *efx,
 147                                struct efx_self_tests *tests)
 148 {
 149         struct efx_channel *channel;
 150
 151         EFX_LOG(efx, "testing interrupts\n");
 152         tests->interrupt = -1;
 153
 154         /* Reset interrupt flag */
 155         efx->last_irq_cpu = -1;
 156         smp_wmb();
 157
 158         /* ACK each interrupting event queue. Receiving an interrupt due to
 159          * traffic before a test event is raised is considered a pass */
 160         efx_for_each_channel(channel, efx) {
 161                 if (channel->work_pending)
 162                         efx_process_channel_now(channel);
 163                 if (efx->last_irq_cpu >= 0)
 164                         goto success;
 165         }
 166
 167         falcon_generate_interrupt(efx);
 168
 169         /* Wait for arrival of test interrupt. */
 170         EFX_LOG(efx, "waiting for test interrupt\n");
 171         schedule_timeout_uninterruptible(HZ / 10);
 172         if (efx->last_irq_cpu >= 0)
 173                 goto success;
 174
 175         EFX_ERR(efx, "timed out waiting for interrupt\n");
 176         return -ETIMEDOUT;
 177
 178  success:
 179         EFX_LOG(efx, "test interrupt (mode %d) seen on CPU%d\n",
 180                 efx->interrupt_mode, efx->last_irq_cpu);
 181         tests->interrupt = 1;
 182         return 0;
 183 }
 184
 185 /* Test generation and receipt of interrupting events */
 186 static int efx_test_eventq_irq(struct efx_channel *channel,
 187                                struct efx_self_tests *tests)
 188 {
 189         unsigned int magic, count;
 190
 191         /* Channel specific code, limited to 20 bits */
 192         magic = (0x00010150 + channel->channel);
 193         EFX_LOG(channel->efx, "channel %d testing event queue with code %x\n",
 194                 channel->channel, magic);
 195
 196         tests->eventq_dma[channel->channel] = -1;
 197         tests->eventq_int[channel->channel] = -1;
 198         tests->eventq_poll[channel->channel] = -1;
 199
 200         /* Reset flag and zero magic word */
 201         channel->efx->last_irq_cpu = -1;
 202         channel->eventq_magic = 0;
 203         smp_wmb();
 204
 205         falcon_generate_test_event(channel, magic);
 206
 207         /* Wait for arrival of interrupt */
 208         count = 0;
 209         do {
 210                 schedule_timeout_uninterruptible(HZ / 100);
 211
 212                 if (channel->work_pending)
 213                         efx_process_channel_now(channel);
 214
 215                 if (channel->eventq_magic == magic)
 216                         goto eventq_ok;
 217         } while (++count < 2);
 218
 219         EFX_ERR(channel->efx, "channel %d timed out waiting for event queue\n",
 220                 channel->channel);
 221
 222         /* See if interrupt arrived */
 223         if (channel->efx->last_irq_cpu >= 0) {
 224                 EFX_ERR(channel->efx, "channel %d saw interrupt on CPU%d "
 225                         "during event queue test\n", channel->channel,
 226                         raw_smp_processor_id());
 227                 tests->eventq_int[channel->channel] = 1;
 228         }
 229
 230         /* Check to see if event was received even if interrupt wasn't */
 231         efx_process_channel_now(channel);
 232         if (channel->eventq_magic == magic) {
 233                 EFX_ERR(channel->efx, "channel %d event was generated, but "
 234                         "failed to trigger an interrupt\n", channel->channel);
 235                 tests->eventq_dma[channel->channel] = 1;
 236         }
 237
 238         return -ETIMEDOUT;
 239  eventq_ok:
 240         EFX_LOG(channel->efx, "channel %d event queue passed\n",
 241                 channel->channel);
 242         tests->eventq_dma[channel->channel] = 1;
 243         tests->eventq_int[channel->channel] = 1;
 244         tests->eventq_poll[channel->channel] = 1;
 245         return 0;
 246 }
 247
 248 static int efx_test_phy(struct efx_nic *efx, struct efx_self_tests *tests,
 249                         unsigned flags)
 250 {
 251         int rc;
 252
 253         if (!efx->phy_op->run_tests)
 254                 return 0;
 255
 256         EFX_BUG_ON_PARANOID(efx->phy_op->num_tests == 0 ||
 257                             efx->phy_op->num_tests > EFX_MAX_PHY_TESTS);
 258
 259         mutex_lock(&efx->mac_lock);
 260         rc = efx->phy_op->run_tests(efx, tests->phy, flags);
 261         mutex_unlock(&efx->mac_lock);
 262         return rc;
 263 }
 264
 265 /**************************************************************************
 266  *
 267  * Loopback testing
 268  * NB Only one loopback test can be executing concurrently.
 269  *
 270  **************************************************************************/
 271
 272 /* Loopback test RX callback
 273  * This is called for each received packet during loopback testing.
 274  */
 275 void efx_loopback_rx_packet(struct efx_nic *efx,
 276                             const char *buf_ptr, int pkt_len)
 277 {
 278         struct efx_loopback_state *state = efx->loopback_selftest;
 279         struct efx_loopback_payload *received;
 280         struct efx_loopback_payload *payload;
 281
 282         BUG_ON(!buf_ptr);
 283
 284         /* If we are just flushing, then drop the packet */
 285         if ((state == NULL) || state->flush)
 286                 return;
 287
 288         payload = &state->payload;
 289
 290         received = (struct efx_loopback_payload *) buf_ptr;
 291         received->ip.saddr = payload->ip.saddr;
 292         if (state->offload_csum)
 293                 received->ip.check = payload->ip.check;
 294
 295         /* Check that header exists */
 296         if (pkt_len < sizeof(received->header)) {
 297                 EFX_ERR(efx, "saw runt RX packet (length %d) in %s loopback "
 298                         "test\n", pkt_len, LOOPBACK_MODE(efx));
 299                 goto err;
 300         }
 301
 302         /* Check that the ethernet header exists */
 303         if (memcmp(&received->header, &payload->header, ETH_HLEN) != 0) {
 304                 EFX_ERR(efx, "saw non-loopback RX packet in %s loopback test\n",
 305                         LOOPBACK_MODE(efx));
 306                 goto err;
 307         }
 308
 309         /* Check packet length */
 310         if (pkt_len != sizeof(*payload)) {
 311                 EFX_ERR(efx, "saw incorrect RX packet length %d (wanted %d) in "
 312                         "%s loopback test\n", pkt_len, (int)sizeof(*payload),
 313                         LOOPBACK_MODE(efx));
 314                 goto err;
 315         }
 316
 317         /* Check that IP header matches */
 318         if (memcmp(&received->ip, &payload->ip, sizeof(payload->ip)) != 0) {
 319                 EFX_ERR(efx, "saw corrupted IP header in %s loopback test\n",
 320                         LOOPBACK_MODE(efx));
 321                 goto err;
 322         }
 323
 324         /* Check that msg and padding matches */
 325         if (memcmp(&received->msg, &payload->msg, sizeof(received->msg)) != 0) {
 326                 EFX_ERR(efx, "saw corrupted RX packet in %s loopback test\n",
 327                         LOOPBACK_MODE(efx));
 328                 goto err;
 329         }
 330
 331         /* Check that iteration matches */
 332         if (received->iteration != payload->iteration) {
 333                 EFX_ERR(efx, "saw RX packet from iteration %d (wanted %d) in "
 334                         "%s loopback test\n", ntohs(received->iteration),
 335                         ntohs(payload->iteration), LOOPBACK_MODE(efx));
 336                 goto err;
 337         }
 338
 339         /* Increase correct RX count */
 340         EFX_TRACE(efx, "got loopback RX in %s loopback test\n",
 341                   LOOPBACK_MODE(efx));
 342
 343         atomic_inc(&state->rx_good);
 344         return;
 345
 346  err:
 347 #ifdef EFX_ENABLE_DEBUG
 348         if (atomic_read(&state->rx_bad) == 0) {
 349                 EFX_ERR(efx, "received packet:\n");
 350                 print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 0x10, 1,
 351                                buf_ptr, pkt_len, 0);
 352                 EFX_ERR(efx, "expected packet:\n");
 353                 print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 0x10, 1,
 354                                &state->payload, sizeof(state->payload), 0);
 355         }
 356 #endif
 357         atomic_inc(&state->rx_bad);
 358 }
 359
 360 /* Initialise an efx_selftest_state for a new iteration */
 361 static void efx_iterate_state(struct efx_nic *efx)
 362 {
 363         struct efx_loopback_state *state = efx->loopback_selftest;
 364         struct net_device *net_dev = efx->net_dev;
 365         struct efx_loopback_payload *payload = &state->payload;
 366
 367         /* Initialise the layerII header */
 368         memcpy(&payload->header.h_dest, net_dev->dev_addr, ETH_ALEN);
 369         memcpy(&payload->header.h_source, &payload_source, ETH_ALEN);
 370         payload->header.h_proto = htons(ETH_P_IP);
 371
 372         /* saddr set later and used as incrementing count */
 373         payload->ip.daddr = htonl(INADDR_LOOPBACK);
 374         payload->ip.ihl = 5;
 375         payload->ip.check = htons(0xdead);
 376         payload->ip.tot_len = htons(sizeof(*payload) - sizeof(struct ethhdr));
 377         payload->ip.version = IPVERSION;
 378         payload->ip.protocol = IPPROTO_UDP;
 379
 380         /* Initialise udp header */
 381         payload->udp.source = 0;
 382         payload->udp.len = htons(sizeof(*payload) - sizeof(struct ethhdr) -
 383                                  sizeof(struct iphdr));
 384         payload->udp.check = 0; /* checksum ignored */
 385
 386         /* Fill out payload */
 387         payload->iteration = htons(ntohs(payload->iteration) + 1);
 388         memcpy(&payload->msg, payload_msg, sizeof(payload_msg));
 389
 390         /* Fill out remaining state members */
 391         atomic_set(&state->rx_good, 0);
 392         atomic_set(&state->rx_bad, 0);
 393         smp_wmb();
 394 }
 395
 396 static int efx_begin_loopback(struct efx_tx_queue *tx_queue)
 397 {
 398         struct efx_nic *efx = tx_queue->efx;
 399         struct efx_loopback_state *state = efx->loopback_selftest;
 400         struct efx_loopback_payload *payload;
 401         struct sk_buff *skb;
 402         int i;
 403         netdev_tx_t rc;
 404
 405         /* Transmit N copies of buffer */
 406         for (i = 0; i < state->packet_count; i++) {
 407                 /* Allocate an skb, holding an extra reference for
 408                  * transmit completion counting */
 409                 skb = alloc_skb(sizeof(state->payload), GFP_KERNEL);
 410                 if (!skb)
 411                         return -ENOMEM;
 412                 state->skbs[i] = skb;
 413                 skb_get(skb);
 414
 415                 /* Copy the payload in, incrementing the source address to
 416                  * exercise the rss vectors */
 417                 payload = ((struct efx_loopback_payload *)
 418                            skb_put(skb, sizeof(state->payload)));
 419                 memcpy(payload, &state->payload, sizeof(state->payload));
 420                 payload->ip.saddr = htonl(INADDR_LOOPBACK | (i << 2));
 421
 422                 /* Ensure everything we've written is visible to the
 423                  * interrupt handler. */
 424                 smp_wmb();
 425
 426                 if (efx_dev_registered(efx))
 427                         netif_tx_lock_bh(efx->net_dev);
 428                 rc = efx_xmit(efx, tx_queue, skb);
 429                 if (efx_dev_registered(efx))
 430                         netif_tx_unlock_bh(efx->net_dev);
 431
 432                 if (rc != NETDEV_TX_OK) {
 433                         EFX_ERR(efx, "TX queue %d could not transmit packet %d "
 434                                 "of %d in %s loopback test\n", tx_queue->queue,
 435                                 i + 1, state->packet_count, LOOPBACK_MODE(efx));
 436
 437                         /* Defer cleaning up the other skbs for the caller */
 438                         kfree_skb(skb);
 439                         return -EPIPE;
 440                 }
 441                 efx->net_dev->trans_start = jiffies;
 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->type->txd_ring_mask + 1) / 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 static int efx_test_loopbacks(struct efx_nic *efx, struct efx_self_tests *tests,
 571                               unsigned int loopback_modes)
 572 {
 573         enum efx_loopback_mode mode;
 574         struct efx_loopback_state *state;
 575         struct efx_tx_queue *tx_queue;
 576         bool link_up;
 577         int count, rc = 0;
 578
 579         /* Set the port loopback_selftest member. From this point on
 580          * all received packets will be dropped. Mark the state as
 581          * "flushing" so all inflight packets are dropped */
 582         state = kzalloc(sizeof(*state), GFP_KERNEL);
 583         if (state == NULL)
 584                 return -ENOMEM;
 585         BUG_ON(efx->loopback_selftest);
 586         state->flush = true;
 587         efx->loopback_selftest = state;
 588
 589         /* Test all supported loopback modes */
 590         for (mode = LOOPBACK_NONE; mode <= LOOPBACK_TEST_MAX; mode++) {
 591                 if (!(loopback_modes & (1 << mode)))
 592                         continue;
 593
 594                 /* Move the port into the specified loopback mode. */
 595                 state->flush = true;
 596                 efx->loopback_mode = mode;
 597                 efx_reconfigure_port(efx);
 598
 599                 /* Wait for the PHY to signal the link is up. Interrupts
 600                  * are enabled for PHY's using LASI, otherwise we poll()
 601                  * quickly */
 602                 count = 0;
 603                 do {
 604                         struct efx_channel *channel = &efx->channel[0];
 605
 606                         efx->phy_op->poll(efx);
 607                         schedule_timeout_uninterruptible(HZ / 10);
 608                         if (channel->work_pending)
 609                                 efx_process_channel_now(channel);
 610                         /* Wait for PHY events to be processed */
 611                         flush_workqueue(efx->workqueue);
 612                         rmb();
 613
 614                         /* We need both the phy and xaui links to be ok.
 615                          * rather than relying on the falcon_xmac irq/poll
 616                          * regime, just poll xaui directly */
 617                         link_up = efx->link_up;
 618                         if (link_up && EFX_IS10G(efx) &&
 619                             !falcon_xaui_link_ok(efx))
 620                                 link_up = false;
 621
 622                 } while ((++count < 20) && !link_up);
 623
 624                 /* The link should now be up. If it isn't, there is no point
 625                  * in attempting a loopback test */
 626                 if (!link_up) {
 627                         EFX_ERR(efx, "loopback %s never came up\n",
 628                                 LOOPBACK_MODE(efx));
 629                         rc = -EIO;
 630                         goto out;
 631                 }
 632
 633                 EFX_LOG(efx, "link came up in %s loopback in %d iterations\n",
 634                         LOOPBACK_MODE(efx), count);
 635
 636                 /* Test every TX queue */
 637                 efx_for_each_tx_queue(tx_queue, efx) {
 638                         state->offload_csum = (tx_queue->queue ==
 639                                                EFX_TX_QUEUE_OFFLOAD_CSUM);
 640                         rc = efx_test_loopback(tx_queue,
 641                                                &tests->loopback[mode]);
 642                         if (rc)
 643                                 goto out;
 644                 }
 645         }
 646
 647  out:
 648         /* Remove the flush. The caller will remove the loopback setting */
 649         state->flush = true;
 650         efx->loopback_selftest = NULL;
 651         wmb();
 652         kfree(state);
 653
 654         return rc;
 655 }
 656
 657 /**************************************************************************
 658  *
 659  * Entry point
 660  *
 661  *************************************************************************/
 662
 663 int efx_selftest(struct efx_nic *efx, struct efx_self_tests *tests,
 664                  unsigned flags)
 665 {
 666         enum efx_loopback_mode loopback_mode = efx->loopback_mode;
 667         int phy_mode = efx->phy_mode;
 668         enum reset_type reset_method = RESET_TYPE_INVISIBLE;
 669         struct ethtool_cmd ecmd;
 670         struct efx_channel *channel;
 671         int rc_test = 0, rc_reset = 0, rc;
 672
 673         /* Online (i.e. non-disruptive) testing
 674          * This checks interrupt generation, event delivery and PHY presence. */
 675
 676         rc = efx_test_mdio(efx, tests);
 677         if (rc && !rc_test)
 678                 rc_test = rc;
 679
 680         rc = efx_test_nvram(efx, tests);
 681         if (rc && !rc_test)
 682                 rc_test = rc;
 683
 684         rc = efx_test_interrupts(efx, tests);
 685         if (rc && !rc_test)
 686                 rc_test = rc;
 687
 688         efx_for_each_channel(channel, efx) {
 689                 rc = efx_test_eventq_irq(channel, tests);
 690                 if (rc && !rc_test)
 691                         rc_test = rc;
 692         }
 693
 694         if (rc_test)
 695                 return rc_test;
 696
 697         if (!(flags & ETH_TEST_FL_OFFLINE))
 698                 return efx_test_phy(efx, tests, flags);
 699
 700         /* Offline (i.e. disruptive) testing
 701          * This checks MAC and PHY loopback on the specified port. */
 702
 703         /* force the carrier state off so the kernel doesn't transmit during
 704          * the loopback test, and the watchdog timeout doesn't fire. Also put
 705          * falcon into loopback for the register test.
 706          */
 707         mutex_lock(&efx->mac_lock);
 708         efx->port_inhibited = true;
 709         if (efx->loopback_modes) {
 710                 /* We need the 312 clock from the PHY to test the XMAC
 711                  * registers, so move into XGMII loopback if available */
 712                 if (efx->loopback_modes & (1 << LOOPBACK_XGMII))
 713                         efx->loopback_mode = LOOPBACK_XGMII;
 714                 else
 715                         efx->loopback_mode = __ffs(efx->loopback_modes);
 716         }
 717
 718         __efx_reconfigure_port(efx);
 719         mutex_unlock(&efx->mac_lock);
 720
 721         /* free up all consumers of SRAM (including all the queues) */
 722         efx_reset_down(efx, reset_method, &ecmd);
 723
 724         rc = efx_test_chip(efx, tests);
 725         if (rc && !rc_test)
 726                 rc_test = rc;
 727
 728         /* reset the chip to recover from the register test */
 729         rc_reset = falcon_reset_hw(efx, reset_method);
 730
 731         /* Ensure that the phy is powered and out of loopback
 732          * for the bist and loopback tests */
 733         efx->phy_mode &= ~PHY_MODE_LOW_POWER;
 734         efx->loopback_mode = LOOPBACK_NONE;
 735
 736         rc = efx_reset_up(efx, reset_method, &ecmd, rc_reset == 0);
 737         if (rc && !rc_reset)
 738                 rc_reset = rc;
 739
 740         if (rc_reset) {
 741                 EFX_ERR(efx, "Unable to recover from chip test\n");
 742                 efx_schedule_reset(efx, RESET_TYPE_DISABLE);
 743                 return rc_reset;
 744         }
 745
 746         rc = efx_test_phy(efx, tests, flags);
 747         if (rc && !rc_test)
 748                 rc_test = rc;
 749
 750         rc = efx_test_loopbacks(efx, tests, efx->loopback_modes);
 751         if (rc && !rc_test)
 752                 rc_test = rc;
 753
 754         /* restore the PHY to the previous state */
 755         efx->loopback_mode = loopback_mode;
 756         efx->phy_mode = phy_mode;
 757         efx->port_inhibited = false;
 758         efx_ethtool_set_settings(efx->net_dev, &ecmd);
 759
 760         return rc_test;
 761 }
 762