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 "boards.h"
  28 #include "workarounds.h"
  29 #include "mac.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_selftest_state - persistent state during a 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_selftest_state {
  63         int flush;
  64         int packet_count;
  65         struct sk_buff **skbs;
  66         atomic_t rx_good;
  67         atomic_t rx_bad;
  68         struct efx_loopback_payload payload;
  69 };
  70
  71 /**************************************************************************
  72  *
  73  * Configurable values
  74  *
  75  **************************************************************************/
  76
  77 /* Level of loopback testing
  78  *
  79  * The maximum packet burst length is 16**(n-1), i.e.
  80  *
  81  * - Level 0 : no packets
  82  * - Level 1 : 1 packet
  83  * - Level 2 : 17 packets (1 * 1 packet, 1 * 16 packets)
  84  * - Level 3 : 273 packets (1 * 1 packet, 1 * 16 packet, 1 * 256 packets)
  85  *
  86  */
  87 static unsigned int loopback_test_level = 3;
  88
  89 /**************************************************************************
  90  *
  91  * Interrupt and event queue testing
  92  *
  93  **************************************************************************/
  94
  95 /* Test generation and receipt of interrupts */
  96 static int efx_test_interrupts(struct efx_nic *efx,
  97                                struct efx_self_tests *tests)
  98 {
  99         struct efx_channel *channel;
 100
 101         EFX_LOG(efx, "testing interrupts\n");
 102         tests->interrupt = -1;
 103
 104         /* Reset interrupt flag */
 105         efx->last_irq_cpu = -1;
 106         smp_wmb();
 107
 108         /* ACK each interrupting event queue. Receiving an interrupt due to
 109          * traffic before a test event is raised is considered a pass */
 110         efx_for_each_channel_with_interrupt(channel, efx) {
 111                 if (channel->work_pending)
 112                         efx_process_channel_now(channel);
 113                 if (efx->last_irq_cpu >= 0)
 114                         goto success;
 115         }
 116
 117         falcon_generate_interrupt(efx);
 118
 119         /* Wait for arrival of test interrupt. */
 120         EFX_LOG(efx, "waiting for test interrupt\n");
 121         schedule_timeout_uninterruptible(HZ / 10);
 122         if (efx->last_irq_cpu >= 0)
 123                 goto success;
 124
 125         EFX_ERR(efx, "timed out waiting for interrupt\n");
 126         return -ETIMEDOUT;
 127
 128  success:
 129         EFX_LOG(efx, "test interrupt (mode %d) seen on CPU%d\n",
 130                 efx->interrupt_mode, efx->last_irq_cpu);
 131         tests->interrupt = 1;
 132         return 0;
 133 }
 134
 135 /* Test generation and receipt of non-interrupting events */
 136 static int efx_test_eventq(struct efx_channel *channel,
 137                            struct efx_self_tests *tests)
 138 {
 139         unsigned int magic;
 140
 141         /* Channel specific code, limited to 20 bits */
 142         magic = (0x00010150 + channel->channel);
 143         EFX_LOG(channel->efx, "channel %d testing event queue with code %x\n",
 144                 channel->channel, magic);
 145
 146         tests->eventq_dma[channel->channel] = -1;
 147         tests->eventq_int[channel->channel] = 1;        /* fake pass */
 148         tests->eventq_poll[channel->channel] = 1;       /* fake pass */
 149
 150         /* Reset flag and zero magic word */
 151         channel->efx->last_irq_cpu = -1;
 152         channel->eventq_magic = 0;
 153         smp_wmb();
 154
 155         falcon_generate_test_event(channel, magic);
 156         udelay(1);
 157
 158         efx_process_channel_now(channel);
 159         if (channel->eventq_magic != magic) {
 160                 EFX_ERR(channel->efx, "channel %d  failed to see test event\n",
 161                         channel->channel);
 162                 return -ETIMEDOUT;
 163         } else {
 164                 tests->eventq_dma[channel->channel] = 1;
 165         }
 166
 167         return 0;
 168 }
 169
 170 /* Test generation and receipt of interrupting events */
 171 static int efx_test_eventq_irq(struct efx_channel *channel,
 172                                struct efx_self_tests *tests)
 173 {
 174         unsigned int magic, count;
 175
 176         /* Channel specific code, limited to 20 bits */
 177         magic = (0x00010150 + channel->channel);
 178         EFX_LOG(channel->efx, "channel %d testing event queue with code %x\n",
 179                 channel->channel, magic);
 180
 181         tests->eventq_dma[channel->channel] = -1;
 182         tests->eventq_int[channel->channel] = -1;
 183         tests->eventq_poll[channel->channel] = -1;
 184
 185         /* Reset flag and zero magic word */
 186         channel->efx->last_irq_cpu = -1;
 187         channel->eventq_magic = 0;
 188         smp_wmb();
 189
 190         falcon_generate_test_event(channel, magic);
 191
 192         /* Wait for arrival of interrupt */
 193         count = 0;
 194         do {
 195                 schedule_timeout_uninterruptible(HZ / 100);
 196
 197                 if (channel->work_pending)
 198                         efx_process_channel_now(channel);
 199
 200                 if (channel->eventq_magic == magic)
 201                         goto eventq_ok;
 202         } while (++count < 2);
 203
 204         EFX_ERR(channel->efx, "channel %d timed out waiting for event queue\n",
 205                 channel->channel);
 206
 207         /* See if interrupt arrived */
 208         if (channel->efx->last_irq_cpu >= 0) {
 209                 EFX_ERR(channel->efx, "channel %d saw interrupt on CPU%d "
 210                         "during event queue test\n", channel->channel,
 211                         raw_smp_processor_id());
 212                 tests->eventq_int[channel->channel] = 1;
 213         }
 214
 215         /* Check to see if event was received even if interrupt wasn't */
 216         efx_process_channel_now(channel);
 217         if (channel->eventq_magic == magic) {
 218                 EFX_ERR(channel->efx, "channel %d event was generated, but "
 219                         "failed to trigger an interrupt\n", channel->channel);
 220                 tests->eventq_dma[channel->channel] = 1;
 221         }
 222
 223         return -ETIMEDOUT;
 224  eventq_ok:
 225         EFX_LOG(channel->efx, "channel %d event queue passed\n",
 226                 channel->channel);
 227         tests->eventq_dma[channel->channel] = 1;
 228         tests->eventq_int[channel->channel] = 1;
 229         tests->eventq_poll[channel->channel] = 1;
 230         return 0;
 231 }
 232
 233 /**************************************************************************
 234  *
 235  * PHY testing
 236  *
 237  **************************************************************************/
 238
 239 /* Check PHY presence by reading the PHY ID registers */
 240 static int efx_test_phy(struct efx_nic *efx,
 241                         struct efx_self_tests *tests)
 242 {
 243         u16 physid1, physid2;
 244         struct mii_if_info *mii = &efx->mii;
 245         struct net_device *net_dev = efx->net_dev;
 246
 247         if (efx->phy_type == PHY_TYPE_NONE)
 248                 return 0;
 249
 250         EFX_LOG(efx, "testing PHY presence\n");
 251         tests->phy_ok = -1;
 252
 253         physid1 = mii->mdio_read(net_dev, mii->phy_id, MII_PHYSID1);
 254         physid2 = mii->mdio_read(net_dev, mii->phy_id, MII_PHYSID2);
 255
 256         if ((physid1 != 0x0000) && (physid1 != 0xffff) &&
 257             (physid2 != 0x0000) && (physid2 != 0xffff)) {
 258                 EFX_LOG(efx, "found MII PHY %d ID 0x%x:%x\n",
 259                         mii->phy_id, physid1, physid2);
 260                 tests->phy_ok = 1;
 261                 return 0;
 262         }
 263
 264         EFX_ERR(efx, "no MII PHY present with ID %d\n", mii->phy_id);
 265         return -ENODEV;
 266 }
 267
 268 /**************************************************************************
 269  *
 270  * Loopback testing
 271  * NB Only one loopback test can be executing concurrently.
 272  *
 273  **************************************************************************/
 274
 275 /* Loopback test RX callback
 276  * This is called for each received packet during loopback testing.
 277  */
 278 void efx_loopback_rx_packet(struct efx_nic *efx,
 279                             const char *buf_ptr, int pkt_len)
 280 {
 281         struct efx_selftest_state *state = efx->loopback_selftest;
 282         struct efx_loopback_payload *received;
 283         struct efx_loopback_payload *payload;
 284
 285         BUG_ON(!buf_ptr);
 286
 287         /* If we are just flushing, then drop the packet */
 288         if ((state == NULL) || state->flush)
 289                 return;
 290
 291         payload = &state->payload;
 292
 293         received = (struct efx_loopback_payload *) buf_ptr;
 294         received->ip.saddr = payload->ip.saddr;
 295         received->ip.check = payload->ip.check;
 296
 297         /* Check that header exists */
 298         if (pkt_len < sizeof(received->header)) {
 299                 EFX_ERR(efx, "saw runt RX packet (length %d) in %s loopback "
 300                         "test\n", pkt_len, LOOPBACK_MODE(efx));
 301                 goto err;
 302         }
 303
 304         /* Check that the ethernet header exists */
 305         if (memcmp(&received->header, &payload->header, ETH_HLEN) != 0) {
 306                 EFX_ERR(efx, "saw non-loopback RX packet in %s loopback test\n",
 307                         LOOPBACK_MODE(efx));
 308                 goto err;
 309         }
 310
 311         /* Check packet length */
 312         if (pkt_len != sizeof(*payload)) {
 313                 EFX_ERR(efx, "saw incorrect RX packet length %d (wanted %d) in "
 314                         "%s loopback test\n", pkt_len, (int)sizeof(*payload),
 315                         LOOPBACK_MODE(efx));
 316                 goto err;
 317         }
 318
 319         /* Check that IP header matches */
 320         if (memcmp(&received->ip, &payload->ip, sizeof(payload->ip)) != 0) {
 321                 EFX_ERR(efx, "saw corrupted IP header in %s loopback test\n",
 322                         LOOPBACK_MODE(efx));
 323                 goto err;
 324         }
 325
 326         /* Check that msg and padding matches */
 327         if (memcmp(&received->msg, &payload->msg, sizeof(received->msg)) != 0) {
 328                 EFX_ERR(efx, "saw corrupted RX packet in %s loopback test\n",
 329                         LOOPBACK_MODE(efx));
 330                 goto err;
 331         }
 332
 333         /* Check that iteration matches */
 334         if (received->iteration != payload->iteration) {
 335                 EFX_ERR(efx, "saw RX packet from iteration %d (wanted %d) in "
 336                         "%s loopback test\n", ntohs(received->iteration),
 337                         ntohs(payload->iteration), LOOPBACK_MODE(efx));
 338                 goto err;
 339         }
 340
 341         /* Increase correct RX count */
 342         EFX_TRACE(efx, "got loopback RX in %s loopback test\n",
 343                   LOOPBACK_MODE(efx));
 344
 345         atomic_inc(&state->rx_good);
 346         return;
 347
 348  err:
 349 #ifdef EFX_ENABLE_DEBUG
 350         if (atomic_read(&state->rx_bad) == 0) {
 351                 EFX_ERR(efx, "received packet:\n");
 352                 print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 0x10, 1,
 353                                buf_ptr, pkt_len, 0);
 354                 EFX_ERR(efx, "expected packet:\n");
 355                 print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 0x10, 1,
 356                                &state->payload, sizeof(state->payload), 0);
 357         }
 358 #endif
 359         atomic_inc(&state->rx_bad);
 360 }
 361
 362 /* Initialise an efx_selftest_state for a new iteration */
 363 static void efx_iterate_state(struct efx_nic *efx)
 364 {
 365         struct efx_selftest_state *state = efx->loopback_selftest;
 366         struct net_device *net_dev = efx->net_dev;
 367         struct efx_loopback_payload *payload = &state->payload;
 368
 369         /* Initialise the layerII header */
 370         memcpy(&payload->header.h_dest, net_dev->dev_addr, ETH_ALEN);
 371         memcpy(&payload->header.h_source, &payload_source, ETH_ALEN);
 372         payload->header.h_proto = htons(ETH_P_IP);
 373
 374         /* saddr set later and used as incrementing count */
 375         payload->ip.daddr = htonl(INADDR_LOOPBACK);
 376         payload->ip.ihl = 5;
 377         payload->ip.check = htons(0xdead);
 378         payload->ip.tot_len = htons(sizeof(*payload) - sizeof(struct ethhdr));
 379         payload->ip.version = IPVERSION;
 380         payload->ip.protocol = IPPROTO_UDP;
 381
 382         /* Initialise udp header */
 383         payload->udp.source = 0;
 384         payload->udp.len = htons(sizeof(*payload) - sizeof(struct ethhdr) -
 385                                  sizeof(struct iphdr));
 386         payload->udp.check = 0; /* checksum ignored */
 387
 388         /* Fill out payload */
 389         payload->iteration = htons(ntohs(payload->iteration) + 1);
 390         memcpy(&payload->msg, payload_msg, sizeof(payload_msg));
 391
 392         /* Fill out remaining state members */
 393         atomic_set(&state->rx_good, 0);
 394         atomic_set(&state->rx_bad, 0);
 395         smp_wmb();
 396 }
 397
 398 static int efx_tx_loopback(struct efx_tx_queue *tx_queue)
 399 {
 400         struct efx_nic *efx = tx_queue->efx;
 401         struct efx_selftest_state *state = efx->loopback_selftest;
 402         struct efx_loopback_payload *payload;
 403         struct sk_buff *skb;
 404         int i, rc;
 405
 406         /* Transmit N copies of buffer */
 407         for (i = 0; i < state->packet_count; i++) {
 408                 /* Allocate an skb, holding an extra reference for
 409                  * transmit completion counting */
 410                 skb = alloc_skb(sizeof(state->payload), GFP_KERNEL);
 411                 if (!skb)
 412                         return -ENOMEM;
 413                 state->skbs[i] = skb;
 414                 skb_get(skb);
 415
 416                 /* Copy the payload in, incrementing the source address to
 417                  * exercise the rss vectors */
 418                 payload = ((struct efx_loopback_payload *)
 419                            skb_put(skb, sizeof(state->payload)));
 420                 memcpy(payload, &state->payload, sizeof(state->payload));
 421                 payload->ip.saddr = htonl(INADDR_LOOPBACK | (i << 2));
 422
 423                 /* Ensure everything we've written is visible to the
 424                  * interrupt handler. */
 425                 smp_wmb();
 426
 427                 if (efx_dev_registered(efx))
 428                         netif_tx_lock_bh(efx->net_dev);
 429                 rc = efx_xmit(efx, tx_queue, skb);
 430                 if (efx_dev_registered(efx))
 431                         netif_tx_unlock_bh(efx->net_dev);
 432
 433                 if (rc != NETDEV_TX_OK) {
 434                         EFX_ERR(efx, "TX queue %d could not transmit packet %d "
 435                                 "of %d in %s loopback test\n", tx_queue->queue,
 436                                 i + 1, state->packet_count, LOOPBACK_MODE(efx));
 437
 438                         /* Defer cleaning up the other skbs for the caller */
 439                         kfree_skb(skb);
 440                         return -EPIPE;
 441                 }
 442         }
 443
 444         return 0;
 445 }
 446
 447 static int efx_rx_loopback(struct efx_tx_queue *tx_queue,
 448                            struct efx_loopback_self_tests *lb_tests)
 449 {
 450         struct efx_nic *efx = tx_queue->efx;
 451         struct efx_selftest_state *state = efx->loopback_selftest;
 452         struct sk_buff *skb;
 453         int tx_done = 0, rx_good, rx_bad;
 454         int i, rc = 0;
 455
 456         if (efx_dev_registered(efx))
 457                 netif_tx_lock_bh(efx->net_dev);
 458
 459         /* Count the number of tx completions, and decrement the refcnt. Any
 460          * skbs not already completed will be free'd when the queue is flushed */
 461         for (i=0; i < state->packet_count; i++) {
 462                 skb = state->skbs[i];
 463                 if (skb && !skb_shared(skb))
 464                         ++tx_done;
 465                 dev_kfree_skb_any(skb);
 466         }
 467
 468         if (efx_dev_registered(efx))
 469                 netif_tx_unlock_bh(efx->net_dev);
 470
 471         /* Check TX completion and received packet counts */
 472         rx_good = atomic_read(&state->rx_good);
 473         rx_bad = atomic_read(&state->rx_bad);
 474         if (tx_done != state->packet_count) {
 475                 /* Don't free the skbs; they will be picked up on TX
 476                  * overflow or channel teardown.
 477                  */
 478                 EFX_ERR(efx, "TX queue %d saw only %d out of an expected %d "
 479                         "TX completion events in %s loopback test\n",
 480                         tx_queue->queue, tx_done, state->packet_count,
 481                         LOOPBACK_MODE(efx));
 482                 rc = -ETIMEDOUT;
 483                 /* Allow to fall through so we see the RX errors as well */
 484         }
 485
 486         /* We may always be up to a flush away from our desired packet total */
 487         if (rx_good != state->packet_count) {
 488                 EFX_LOG(efx, "TX queue %d saw only %d out of an expected %d "
 489                         "received packets in %s loopback test\n",
 490                         tx_queue->queue, rx_good, state->packet_count,
 491                         LOOPBACK_MODE(efx));
 492                 rc = -ETIMEDOUT;
 493                 /* Fall through */
 494         }
 495
 496         /* Update loopback test structure */
 497         lb_tests->tx_sent[tx_queue->queue] += state->packet_count;
 498         lb_tests->tx_done[tx_queue->queue] += tx_done;
 499         lb_tests->rx_good += rx_good;
 500         lb_tests->rx_bad += rx_bad;
 501
 502         return rc;
 503 }
 504
 505 static int
 506 efx_test_loopback(struct efx_tx_queue *tx_queue,
 507                   struct efx_loopback_self_tests *lb_tests)
 508 {
 509         struct efx_nic *efx = tx_queue->efx;
 510         struct efx_selftest_state *state = efx->loopback_selftest;
 511         struct efx_channel *channel;
 512         int i, rc = 0;
 513
 514         for (i = 0; i < loopback_test_level; i++) {
 515                 /* Determine how many packets to send */
 516                 state->packet_count = (efx->type->txd_ring_mask + 1) / 3;
 517                 state->packet_count = min(1 << (i << 2), state->packet_count);
 518                 state->skbs = kzalloc(sizeof(state->skbs[0]) *
 519                                       state->packet_count, GFP_KERNEL);
 520                 if (!state->skbs)
 521                         return -ENOMEM;
 522                 state->flush = 0;
 523
 524                 EFX_LOG(efx, "TX queue %d testing %s loopback with %d "
 525                         "packets\n", tx_queue->queue, LOOPBACK_MODE(efx),
 526                         state->packet_count);
 527
 528                 efx_iterate_state(efx);
 529                 rc = efx_tx_loopback(tx_queue);
 530
 531                 /* NAPI polling is not enabled, so process channels synchronously */
 532                 schedule_timeout_uninterruptible(HZ / 50);
 533                 efx_for_each_channel_with_interrupt(channel, efx) {
 534                         if (channel->work_pending)
 535                                 efx_process_channel_now(channel);
 536                 }
 537
 538                 rc |= efx_rx_loopback(tx_queue, lb_tests);
 539                 kfree(state->skbs);
 540
 541                 if (rc) {
 542                         /* Wait a while to ensure there are no packets
 543                          * floating around after a failure. */
 544                         schedule_timeout_uninterruptible(HZ / 10);
 545                         return rc;
 546                 }
 547         }
 548
 549         EFX_LOG(efx, "TX queue %d passed %s loopback test with a burst length "
 550                 "of %d packets\n", tx_queue->queue, LOOPBACK_MODE(efx),
 551                 state->packet_count);
 552
 553         return rc;
 554 }
 555
 556 static int efx_test_loopbacks(struct efx_nic *efx,
 557                               struct efx_self_tests *tests,
 558                               unsigned int loopback_modes)
 559 {
 560         struct efx_selftest_state *state = efx->loopback_selftest;
 561         struct ethtool_cmd ecmd, ecmd_loopback;
 562         struct efx_tx_queue *tx_queue;
 563         enum efx_loopback_mode old_mode, mode;
 564         int count, rc = 0, link_up;
 565
 566         rc = efx_ethtool_get_settings(efx->net_dev, &ecmd);
 567         if (rc) {
 568                 EFX_ERR(efx, "could not get GMII settings\n");
 569                 return rc;
 570         }
 571         old_mode = efx->loopback_mode;
 572
 573         /* Disable autonegotiation for the purposes of loopback */
 574         memcpy(&ecmd_loopback, &ecmd, sizeof(ecmd_loopback));
 575         if (ecmd_loopback.autoneg == AUTONEG_ENABLE) {
 576                 ecmd_loopback.autoneg = AUTONEG_DISABLE;
 577                 ecmd_loopback.duplex = DUPLEX_FULL;
 578                 ecmd_loopback.speed = SPEED_10000;
 579         }
 580
 581         rc = efx_ethtool_set_settings(efx->net_dev, &ecmd_loopback);
 582         if (rc) {
 583                 EFX_ERR(efx, "could not disable autonegotiation\n");
 584                 goto out;
 585         }
 586         tests->loopback_speed = ecmd_loopback.speed;
 587         tests->loopback_full_duplex = ecmd_loopback.duplex;
 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 = 1;
 596                 efx->loopback_mode = mode;
 597                 efx_reconfigure_port(efx);
 598
 599                 /* Wait for the PHY to signal the link is up */
 600                 count = 0;
 601                 do {
 602                         struct efx_channel *channel = &efx->channel[0];
 603
 604                         falcon_check_xmac(efx);
 605                         schedule_timeout_uninterruptible(HZ / 10);
 606                         if (channel->work_pending)
 607                                 efx_process_channel_now(channel);
 608                         /* Wait for PHY events to be processed */
 609                         flush_workqueue(efx->workqueue);
 610                         rmb();
 611
 612                         /* efx->link_up can be 1 even if the XAUI link is down,
 613                          * (bug5762). Usually, it's not worth bothering with the
 614                          * difference, but for selftests, we need that extra
 615                          * guarantee that the link is really, really, up.
 616                          */
 617                         link_up = efx->link_up;
 618                         if (!falcon_xaui_link_ok(efx))
 619                                 link_up = 0;
 620
 621                 } while ((++count < 20) && !link_up);
 622
 623                 /* The link should now be up. If it isn't, there is no point
 624                  * in attempting a loopback test */
 625                 if (!link_up) {
 626                         EFX_ERR(efx, "loopback %s never came up\n",
 627                                 LOOPBACK_MODE(efx));
 628                         rc = -EIO;
 629                         goto out;
 630                 }
 631
 632                 EFX_LOG(efx, "link came up in %s loopback in %d iterations\n",
 633                         LOOPBACK_MODE(efx), count);
 634
 635                 /* Test every TX queue */
 636                 efx_for_each_tx_queue(tx_queue, efx) {
 637                         rc |= efx_test_loopback(tx_queue,
 638                                                 &tests->loopback[mode]);
 639                         if (rc)
 640                                 goto out;
 641                 }
 642         }
 643
 644  out:
 645         /* Take out of loopback and restore PHY settings */
 646         state->flush = 1;
 647         efx->loopback_mode = old_mode;
 648         efx_ethtool_set_settings(efx->net_dev, &ecmd);
 649
 650         return rc;
 651 }
 652
 653 /**************************************************************************
 654  *
 655  * Entry points
 656  *
 657  *************************************************************************/
 658
 659 /* Online (i.e. non-disruptive) testing
 660  * This checks interrupt generation, event delivery and PHY presence. */
 661 int efx_online_test(struct efx_nic *efx, struct efx_self_tests *tests)
 662 {
 663         struct efx_channel *channel;
 664         int rc = 0;
 665
 666         EFX_LOG(efx, "performing online self-tests\n");
 667
 668         rc |= efx_test_interrupts(efx, tests);
 669         efx_for_each_channel(channel, efx) {
 670                 if (channel->has_interrupt)
 671                         rc |= efx_test_eventq_irq(channel, tests);
 672                 else
 673                         rc |= efx_test_eventq(channel, tests);
 674         }
 675         rc |= efx_test_phy(efx, tests);
 676
 677         if (rc)
 678                 EFX_ERR(efx, "failed online self-tests\n");
 679
 680         return rc;
 681 }
 682
 683 /* Offline (i.e. disruptive) testing
 684  * This checks MAC and PHY loopback on the specified port. */
 685 int efx_offline_test(struct efx_nic *efx,
 686                      struct efx_self_tests *tests, unsigned int loopback_modes)
 687 {
 688         struct efx_selftest_state *state;
 689         int rc = 0;
 690
 691         EFX_LOG(efx, "performing offline self-tests\n");
 692
 693         /* Create a selftest_state structure to hold state for the test */
 694         state = kzalloc(sizeof(*state), GFP_KERNEL);
 695         if (state == NULL) {
 696                 rc = -ENOMEM;
 697                 goto out;
 698         }
 699
 700         /* Set the port loopback_selftest member. From this point on
 701          * all received packets will be dropped. Mark the state as
 702          * "flushing" so all inflight packets are dropped */
 703         BUG_ON(efx->loopback_selftest);
 704         state->flush = 1;
 705         efx->loopback_selftest = state;
 706
 707         rc = efx_test_loopbacks(efx, tests, loopback_modes);
 708
 709         efx->loopback_selftest = NULL;
 710         wmb();
 711         kfree(state);
 712
 713  out:
 714         if (rc)
 715                 EFX_ERR(efx, "failed offline self-tests\n");
 716
 717         return rc;
 718 }
 719