drivers/net/ethernet/sfc/selftest.c

   1 /****************************************************************************
   2  * Driver for Solarflare Solarstorm network controllers and boards
   3  * Copyright 2005-2006 Fen Systems Ltd.
   4  * Copyright 2006-2010 Solarflare Communications Inc.
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License version 2 as published
   8  * by the Free Software Foundation, incorporated herein by reference.
   9  */
  10
  11 #include <linux/netdevice.h>
  12 #include <linux/module.h>
  13 #include <linux/delay.h>
  14 #include <linux/kernel_stat.h>
  15 #include <linux/pci.h>
  16 #include <linux/ethtool.h>
  17 #include <linux/ip.h>
  18 #include <linux/in.h>
  19 #include <linux/udp.h>
  20 #include <linux/rtnetlink.h>
  21 #include <linux/slab.h>
  22 #include <asm/io.h>
  23 #include "net_driver.h"
  24 #include "efx.h"
  25 #include "nic.h"
  26 #include "selftest.h"
  27 #include "workarounds.h"
  28
  29 /*
  30  * Loopback test packet structure
  31  *
  32  * The self-test should stress every RSS vector, and unfortunately
  33  * Falcon only performs RSS on TCP/UDP packets.
  34  */
  35 struct efx_loopback_payload {
  36         struct ethhdr header;
  37         struct iphdr ip;
  38         struct udphdr udp;
  39         __be16 iteration;
  40         const char msg[64];
  41 } __packed;
  42
  43 /* Loopback test source MAC address */
  44 static const unsigned char payload_source[ETH_ALEN] = {
  45         0x00, 0x0f, 0x53, 0x1b, 0x1b, 0x1b,
  46 };
  47
  48 static const char payload_msg[] =
  49         "Hello world! This is an Efx loopback test in progress!";
  50
  51 /* Interrupt mode names */
  52 static const unsigned int efx_interrupt_mode_max = EFX_INT_MODE_MAX;
  53 static const char *efx_interrupt_mode_names[] = {
  54         [EFX_INT_MODE_MSIX]   = "MSI-X",
  55         [EFX_INT_MODE_MSI]    = "MSI",
  56         [EFX_INT_MODE_LEGACY] = "legacy",
  57 };
  58 #define INT_MODE(efx) \
  59         STRING_TABLE_LOOKUP(efx->interrupt_mode, efx_interrupt_mode)
  60
  61 /**
  62  * efx_loopback_state - persistent state during a loopback selftest
  63  * @flush:              Drop all packets in efx_loopback_rx_packet
  64  * @packet_count:       Number of packets being used in this test
  65  * @skbs:               An array of skbs transmitted
  66  * @offload_csum:       Checksums are being offloaded
  67  * @rx_good:            RX good packet count
  68  * @rx_bad:             RX bad packet count
  69  * @payload:            Payload used in tests
  70  */
  71 struct efx_loopback_state {
  72         bool flush;
  73         int packet_count;
  74         struct sk_buff **skbs;
  75         bool offload_csum;
  76         atomic_t rx_good;
  77         atomic_t rx_bad;
  78         struct efx_loopback_payload payload;
  79 };
  80
  81 /**************************************************************************
  82  *
  83  * MII, NVRAM and register tests
  84  *
  85  **************************************************************************/
  86
  87 static int efx_test_phy_alive(struct efx_nic *efx, struct efx_self_tests *tests)
  88 {
  89         int rc = 0;
  90
  91         if (efx->phy_op->test_alive) {
  92                 rc = efx->phy_op->test_alive(efx);
  93                 tests->phy_alive = rc ? -1 : 1;
  94         }
  95
  96         return rc;
  97 }
  98
  99 static int efx_test_nvram(struct efx_nic *efx, struct efx_self_tests *tests)
 100 {
 101         int rc = 0;
 102
 103         if (efx->type->test_nvram) {
 104                 rc = efx->type->test_nvram(efx);
 105                 tests->nvram = rc ? -1 : 1;
 106         }
 107
 108         return rc;
 109 }
 110
 111 static int efx_test_chip(struct efx_nic *efx, struct efx_self_tests *tests)
 112 {
 113         int rc = 0;
 114
 115         /* Test register access */
 116         if (efx->type->test_registers) {
 117                 rc = efx->type->test_registers(efx);
 118                 tests->registers = rc ? -1 : 1;
 119         }
 120
 121         return rc;
 122 }
 123
 124 /**************************************************************************
 125  *
 126  * Interrupt and event queue testing
 127  *
 128  **************************************************************************/
 129
 130 /* Test generation and receipt of interrupts */
 131 static int efx_test_interrupts(struct efx_nic *efx,
 132                                struct efx_self_tests *tests)
 133 {
 134         netif_dbg(efx, drv, efx->net_dev, "testing interrupts\n");
 135         tests->interrupt = -1;
 136
 137         /* Reset interrupt flag */
 138         efx->last_irq_cpu = -1;
 139         smp_wmb();
 140
 141         efx_nic_generate_interrupt(efx);
 142
 143         /* Wait for arrival of test interrupt. */
 144         netif_dbg(efx, drv, efx->net_dev, "waiting for test interrupt\n");
 145         schedule_timeout_uninterruptible(HZ / 10);
 146         if (efx->last_irq_cpu >= 0)
 147                 goto success;
 148
 149         netif_err(efx, drv, efx->net_dev, "timed out waiting for interrupt\n");
 150         return -ETIMEDOUT;
 151
 152  success:
 153         netif_dbg(efx, drv, efx->net_dev, "%s test interrupt seen on CPU%d\n",
 154                   INT_MODE(efx),
 155                 efx->last_irq_cpu);
 156         tests->interrupt = 1;
 157         return 0;
 158 }
 159
 160 /* Test generation and receipt of interrupting events */
 161 static int efx_test_eventq_irq(struct efx_channel *channel,
 162                                struct efx_self_tests *tests)
 163 {
 164         struct efx_nic *efx = channel->efx;
 165         unsigned int read_ptr, count;
 166
 167         tests->eventq_dma[channel->channel] = -1;
 168         tests->eventq_int[channel->channel] = -1;
 169         tests->eventq_poll[channel->channel] = -1;
 170
 171         read_ptr = channel->eventq_read_ptr;
 172         channel->efx->last_irq_cpu = -1;
 173         smp_wmb();
 174
 175         efx_nic_generate_test_event(channel);
 176
 177         /* Wait for arrival of interrupt */
 178         count = 0;
 179         do {
 180                 schedule_timeout_uninterruptible(HZ / 100);
 181
 182                 if (ACCESS_ONCE(channel->eventq_read_ptr) != read_ptr)
 183                         goto eventq_ok;
 184         } while (++count < 2);
 185
 186         netif_err(efx, drv, efx->net_dev,
 187                   "channel %d timed out waiting for event queue\n",
 188                   channel->channel);
 189
 190         /* See if interrupt arrived */
 191         if (channel->efx->last_irq_cpu >= 0) {
 192                 netif_err(efx, drv, efx->net_dev,
 193                           "channel %d saw interrupt on CPU%d "
 194                           "during event queue test\n", channel->channel,
 195                           raw_smp_processor_id());
 196                 tests->eventq_int[channel->channel] = 1;
 197         }
 198
 199         /* Check to see if event was received even if interrupt wasn't */
 200         if (efx_nic_event_present(channel)) {
 201                 netif_err(efx, drv, efx->net_dev,
 202                           "channel %d event was generated, but "
 203                           "failed to trigger an interrupt\n", channel->channel);
 204                 tests->eventq_dma[channel->channel] = 1;
 205         }
 206
 207         return -ETIMEDOUT;
 208  eventq_ok:
 209         netif_dbg(efx, drv, efx->net_dev, "channel %d event queue passed\n",
 210                   channel->channel);
 211         tests->eventq_dma[channel->channel] = 1;
 212         tests->eventq_int[channel->channel] = 1;
 213         tests->eventq_poll[channel->channel] = 1;
 214         return 0;
 215 }
 216
 217 static int efx_test_phy(struct efx_nic *efx, struct efx_self_tests *tests,
 218                         unsigned flags)
 219 {
 220         int rc;
 221
 222         if (!efx->phy_op->run_tests)
 223                 return 0;
 224
 225         mutex_lock(&efx->mac_lock);
 226         rc = efx->phy_op->run_tests(efx, tests->phy_ext, flags);
 227         mutex_unlock(&efx->mac_lock);
 228         return rc;
 229 }
 230
 231 /**************************************************************************
 232  *
 233  * Loopback testing
 234  * NB Only one loopback test can be executing concurrently.
 235  *
 236  **************************************************************************/
 237
 238 /* Loopback test RX callback
 239  * This is called for each received packet during loopback testing.
 240  */
 241 void efx_loopback_rx_packet(struct efx_nic *efx,
 242                             const char *buf_ptr, int pkt_len)
 243 {
 244         struct efx_loopback_state *state = efx->loopback_selftest;
 245         struct efx_loopback_payload *received;
 246         struct efx_loopback_payload *payload;
 247
 248         BUG_ON(!buf_ptr);
 249
 250         /* If we are just flushing, then drop the packet */
 251         if ((state == NULL) || state->flush)
 252                 return;
 253
 254         payload = &state->payload;
 255
 256         received = (struct efx_loopback_payload *) buf_ptr;
 257         received->ip.saddr = payload->ip.saddr;
 258         if (state->offload_csum)
 259                 received->ip.check = payload->ip.check;
 260
 261         /* Check that header exists */
 262         if (pkt_len < sizeof(received->header)) {
 263                 netif_err(efx, drv, efx->net_dev,
 264                           "saw runt RX packet (length %d) in %s loopback "
 265                           "test\n", pkt_len, LOOPBACK_MODE(efx));
 266                 goto err;
 267         }
 268
 269         /* Check that the ethernet header exists */
 270         if (memcmp(&received->header, &payload->header, ETH_HLEN) != 0) {
 271                 netif_err(efx, drv, efx->net_dev,
 272                           "saw non-loopback RX packet in %s loopback test\n",
 273                           LOOPBACK_MODE(efx));
 274                 goto err;
 275         }
 276
 277         /* Check packet length */
 278         if (pkt_len != sizeof(*payload)) {
 279                 netif_err(efx, drv, efx->net_dev,
 280                           "saw incorrect RX packet length %d (wanted %d) in "
 281                           "%s loopback test\n", pkt_len, (int)sizeof(*payload),
 282                           LOOPBACK_MODE(efx));
 283                 goto err;
 284         }
 285
 286         /* Check that IP header matches */
 287         if (memcmp(&received->ip, &payload->ip, sizeof(payload->ip)) != 0) {
 288                 netif_err(efx, drv, efx->net_dev,
 289                           "saw corrupted IP header in %s loopback test\n",
 290                           LOOPBACK_MODE(efx));
 291                 goto err;
 292         }
 293
 294         /* Check that msg and padding matches */
 295         if (memcmp(&received->msg, &payload->msg, sizeof(received->msg)) != 0) {
 296                 netif_err(efx, drv, efx->net_dev,
 297                           "saw corrupted RX packet in %s loopback test\n",
 298                           LOOPBACK_MODE(efx));
 299                 goto err;
 300         }
 301
 302         /* Check that iteration matches */
 303         if (received->iteration != payload->iteration) {
 304                 netif_err(efx, drv, efx->net_dev,
 305                           "saw RX packet from iteration %d (wanted %d) in "
 306                           "%s loopback test\n", ntohs(received->iteration),
 307                           ntohs(payload->iteration), LOOPBACK_MODE(efx));
 308                 goto err;
 309         }
 310
 311         /* Increase correct RX count */
 312         netif_vdbg(efx, drv, efx->net_dev,
 313                    "got loopback RX in %s loopback test\n", LOOPBACK_MODE(efx));
 314
 315         atomic_inc(&state->rx_good);
 316         return;
 317
 318  err:
 319 #ifdef EFX_ENABLE_DEBUG
 320         if (atomic_read(&state->rx_bad) == 0) {
 321                 netif_err(efx, drv, efx->net_dev, "received packet:\n");
 322                 print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 0x10, 1,
 323                                buf_ptr, pkt_len, 0);
 324                 netif_err(efx, drv, efx->net_dev, "expected packet:\n");
 325                 print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 0x10, 1,
 326                                &state->payload, sizeof(state->payload), 0);
 327         }
 328 #endif
 329         atomic_inc(&state->rx_bad);
 330 }
 331
 332 /* Initialise an efx_selftest_state for a new iteration */
 333 static void efx_iterate_state(struct efx_nic *efx)
 334 {
 335         struct efx_loopback_state *state = efx->loopback_selftest;
 336         struct net_device *net_dev = efx->net_dev;
 337         struct efx_loopback_payload *payload = &state->payload;
 338
 339         /* Initialise the layerII header */
 340         memcpy(&payload->header.h_dest, net_dev->dev_addr, ETH_ALEN);
 341         memcpy(&payload->header.h_source, &payload_source, ETH_ALEN);
 342         payload->header.h_proto = htons(ETH_P_IP);
 343
 344         /* saddr set later and used as incrementing count */
 345         payload->ip.daddr = htonl(INADDR_LOOPBACK);
 346         payload->ip.ihl = 5;
 347         payload->ip.check = htons(0xdead);
 348         payload->ip.tot_len = htons(sizeof(*payload) - sizeof(struct ethhdr));
 349         payload->ip.version = IPVERSION;
 350         payload->ip.protocol = IPPROTO_UDP;
 351
 352         /* Initialise udp header */
 353         payload->udp.source = 0;
 354         payload->udp.len = htons(sizeof(*payload) - sizeof(struct ethhdr) -
 355                                  sizeof(struct iphdr));
 356         payload->udp.check = 0; /* checksum ignored */
 357
 358         /* Fill out payload */
 359         payload->iteration = htons(ntohs(payload->iteration) + 1);
 360         memcpy(&payload->msg, payload_msg, sizeof(payload_msg));
 361
 362         /* Fill out remaining state members */
 363         atomic_set(&state->rx_good, 0);
 364         atomic_set(&state->rx_bad, 0);
 365         smp_wmb();
 366 }
 367
 368 static int efx_begin_loopback(struct efx_tx_queue *tx_queue)
 369 {
 370         struct efx_nic *efx = tx_queue->efx;
 371         struct efx_loopback_state *state = efx->loopback_selftest;
 372         struct efx_loopback_payload *payload;
 373         struct sk_buff *skb;
 374         int i;
 375         netdev_tx_t rc;
 376
 377         /* Transmit N copies of buffer */
 378         for (i = 0; i < state->packet_count; i++) {
 379                 /* Allocate an skb, holding an extra reference for
 380                  * transmit completion counting */
 381                 skb = alloc_skb(sizeof(state->payload), GFP_KERNEL);
 382                 if (!skb)
 383                         return -ENOMEM;
 384                 state->skbs[i] = skb;
 385                 skb_get(skb);
 386
 387                 /* Copy the payload in, incrementing the source address to
 388                  * exercise the rss vectors */
 389                 payload = ((struct efx_loopback_payload *)
 390                            skb_put(skb, sizeof(state->payload)));
 391                 memcpy(payload, &state->payload, sizeof(state->payload));
 392                 payload->ip.saddr = htonl(INADDR_LOOPBACK | (i << 2));
 393
 394                 /* Ensure everything we've written is visible to the
 395                  * interrupt handler. */
 396                 smp_wmb();
 397
 398                 if (efx_dev_registered(efx))
 399                         netif_tx_lock_bh(efx->net_dev);
 400                 rc = efx_enqueue_skb(tx_queue, skb);
 401                 if (efx_dev_registered(efx))
 402                         netif_tx_unlock_bh(efx->net_dev);
 403
 404                 if (rc != NETDEV_TX_OK) {
 405                         netif_err(efx, drv, efx->net_dev,
 406                                   "TX queue %d could not transmit packet %d of "
 407                                   "%d in %s loopback test\n", tx_queue->queue,
 408                                   i + 1, state->packet_count,
 409                                   LOOPBACK_MODE(efx));
 410
 411                         /* Defer cleaning up the other skbs for the caller */
 412                         kfree_skb(skb);
 413                         return -EPIPE;
 414                 }
 415         }
 416
 417         return 0;
 418 }
 419
 420 static int efx_poll_loopback(struct efx_nic *efx)
 421 {
 422         struct efx_loopback_state *state = efx->loopback_selftest;
 423         struct efx_channel *channel;
 424
 425         /* NAPI polling is not enabled, so process channels
 426          * synchronously */
 427         efx_for_each_channel(channel, efx) {
 428                 if (channel->work_pending)
 429                         efx_process_channel_now(channel);
 430         }
 431         return atomic_read(&state->rx_good) == state->packet_count;
 432 }
 433
 434 static int efx_end_loopback(struct efx_tx_queue *tx_queue,
 435                             struct efx_loopback_self_tests *lb_tests)
 436 {
 437         struct efx_nic *efx = tx_queue->efx;
 438         struct efx_loopback_state *state = efx->loopback_selftest;
 439         struct sk_buff *skb;
 440         int tx_done = 0, rx_good, rx_bad;
 441         int i, rc = 0;
 442
 443         if (efx_dev_registered(efx))
 444                 netif_tx_lock_bh(efx->net_dev);
 445
 446         /* Count the number of tx completions, and decrement the refcnt. Any
 447          * skbs not already completed will be free'd when the queue is flushed */
 448         for (i=0; i < state->packet_count; i++) {
 449                 skb = state->skbs[i];
 450                 if (skb && !skb_shared(skb))
 451                         ++tx_done;
 452                 dev_kfree_skb_any(skb);
 453         }
 454
 455         if (efx_dev_registered(efx))
 456                 netif_tx_unlock_bh(efx->net_dev);
 457
 458         /* Check TX completion and received packet counts */
 459         rx_good = atomic_read(&state->rx_good);
 460         rx_bad = atomic_read(&state->rx_bad);
 461         if (tx_done != state->packet_count) {
 462                 /* Don't free the skbs; they will be picked up on TX
 463                  * overflow or channel teardown.
 464                  */
 465                 netif_err(efx, drv, efx->net_dev,
 466                           "TX queue %d saw only %d out of an expected %d "
 467                           "TX completion events in %s loopback test\n",
 468                           tx_queue->queue, tx_done, state->packet_count,
 469                           LOOPBACK_MODE(efx));
 470                 rc = -ETIMEDOUT;
 471                 /* Allow to fall through so we see the RX errors as well */
 472         }
 473
 474         /* We may always be up to a flush away from our desired packet total */
 475         if (rx_good != state->packet_count) {
 476                 netif_dbg(efx, drv, efx->net_dev,
 477                           "TX queue %d saw only %d out of an expected %d "
 478                           "received packets in %s loopback test\n",
 479                           tx_queue->queue, rx_good, state->packet_count,
 480                           LOOPBACK_MODE(efx));
 481                 rc = -ETIMEDOUT;
 482                 /* Fall through */
 483         }
 484
 485         /* Update loopback test structure */
 486         lb_tests->tx_sent[tx_queue->queue] += state->packet_count;
 487         lb_tests->tx_done[tx_queue->queue] += tx_done;
 488         lb_tests->rx_good += rx_good;
 489         lb_tests->rx_bad += rx_bad;
 490
 491         return rc;
 492 }
 493
 494 static int
 495 efx_test_loopback(struct efx_tx_queue *tx_queue,
 496                   struct efx_loopback_self_tests *lb_tests)
 497 {
 498         struct efx_nic *efx = tx_queue->efx;
 499         struct efx_loopback_state *state = efx->loopback_selftest;
 500         int i, begin_rc, end_rc;
 501
 502         for (i = 0; i < 3; i++) {
 503                 /* Determine how many packets to send */
 504                 state->packet_count = efx->txq_entries / 3;
 505                 state->packet_count = min(1 << (i << 2), state->packet_count);
 506                 state->skbs = kcalloc(state->packet_count,
 507                                       sizeof(state->skbs[0]), GFP_KERNEL);
 508                 if (!state->skbs)
 509                         return -ENOMEM;
 510                 state->flush = false;
 511
 512                 netif_dbg(efx, drv, efx->net_dev,
 513                           "TX queue %d testing %s loopback with %d packets\n",
 514                           tx_queue->queue, LOOPBACK_MODE(efx),
 515                           state->packet_count);
 516
 517                 efx_iterate_state(efx);
 518                 begin_rc = efx_begin_loopback(tx_queue);
 519
 520                 /* This will normally complete very quickly, but be
 521                  * prepared to wait up to 100 ms. */
 522                 msleep(1);
 523                 if (!efx_poll_loopback(efx)) {
 524                         msleep(100);
 525                         efx_poll_loopback(efx);
 526                 }
 527
 528                 end_rc = efx_end_loopback(tx_queue, lb_tests);
 529                 kfree(state->skbs);
 530
 531                 if (begin_rc || end_rc) {
 532                         /* Wait a while to ensure there are no packets
 533                          * floating around after a failure. */
 534                         schedule_timeout_uninterruptible(HZ / 10);
 535                         return begin_rc ? begin_rc : end_rc;
 536                 }
 537         }
 538
 539         netif_dbg(efx, drv, efx->net_dev,
 540                   "TX queue %d passed %s loopback test with a burst length "
 541                   "of %d packets\n", tx_queue->queue, LOOPBACK_MODE(efx),
 542                   state->packet_count);
 543
 544         return 0;
 545 }
 546
 547 /* Wait for link up. On Falcon, we would prefer to rely on efx_monitor, but
 548  * any contention on the mac lock (via e.g. efx_mac_mcast_work) causes it
 549  * to delay and retry. Therefore, it's safer to just poll directly. Wait
 550  * for link up and any faults to dissipate. */
 551 static int efx_wait_for_link(struct efx_nic *efx)
 552 {
 553         struct efx_link_state *link_state = &efx->link_state;
 554         int count, link_up_count = 0;
 555         bool link_up;
 556
 557         for (count = 0; count < 40; count++) {
 558                 schedule_timeout_uninterruptible(HZ / 10);
 559
 560                 if (efx->type->monitor != NULL) {
 561                         mutex_lock(&efx->mac_lock);
 562                         efx->type->monitor(efx);
 563                         mutex_unlock(&efx->mac_lock);
 564                 } else {
 565                         struct efx_channel *channel = efx_get_channel(efx, 0);
 566                         if (channel->work_pending)
 567                                 efx_process_channel_now(channel);
 568                 }
 569
 570                 mutex_lock(&efx->mac_lock);
 571                 link_up = link_state->up;
 572                 if (link_up)
 573                         link_up = !efx->mac_op->check_fault(efx);
 574                 mutex_unlock(&efx->mac_lock);
 575
 576                 if (link_up) {
 577                         if (++link_up_count == 2)
 578                                 return 0;
 579                 } else {
 580                         link_up_count = 0;
 581                 }
 582         }
 583
 584         return -ETIMEDOUT;
 585 }
 586
 587 static int efx_test_loopbacks(struct efx_nic *efx, struct efx_self_tests *tests,
 588                               unsigned int loopback_modes)
 589 {
 590         enum efx_loopback_mode mode;
 591         struct efx_loopback_state *state;
 592         struct efx_channel *channel = efx_get_channel(efx, 0);
 593         struct efx_tx_queue *tx_queue;
 594         int rc = 0;
 595
 596         /* Set the port loopback_selftest member. From this point on
 597          * all received packets will be dropped. Mark the state as
 598          * "flushing" so all inflight packets are dropped */
 599         state = kzalloc(sizeof(*state), GFP_KERNEL);
 600         if (state == NULL)
 601                 return -ENOMEM;
 602         BUG_ON(efx->loopback_selftest);
 603         state->flush = true;
 604         efx->loopback_selftest = state;
 605
 606         /* Test all supported loopback modes */
 607         for (mode = LOOPBACK_NONE; mode <= LOOPBACK_TEST_MAX; mode++) {
 608                 if (!(loopback_modes & (1 << mode)))
 609                         continue;
 610
 611                 /* Move the port into the specified loopback mode. */
 612                 state->flush = true;
 613                 mutex_lock(&efx->mac_lock);
 614                 efx->loopback_mode = mode;
 615                 rc = __efx_reconfigure_port(efx);
 616                 mutex_unlock(&efx->mac_lock);
 617                 if (rc) {
 618                         netif_err(efx, drv, efx->net_dev,
 619                                   "unable to move into %s loopback\n",
 620                                   LOOPBACK_MODE(efx));
 621                         goto out;
 622                 }
 623
 624                 rc = efx_wait_for_link(efx);
 625                 if (rc) {
 626                         netif_err(efx, drv, efx->net_dev,
 627                                   "loopback %s never came up\n",
 628                                   LOOPBACK_MODE(efx));
 629                         goto out;
 630                 }
 631
 632                 /* Test all enabled types of TX queue */
 633                 efx_for_each_channel_tx_queue(tx_queue, channel) {
 634                         state->offload_csum = (tx_queue->queue &
 635                                                EFX_TXQ_TYPE_OFFLOAD);
 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 efx_channel *channel;
 666         int rc_test = 0, rc_reset = 0, rc;
 667
 668         /* Online (i.e. non-disruptive) testing
 669          * This checks interrupt generation, event delivery and PHY presence. */
 670
 671         rc = efx_test_phy_alive(efx, tests);
 672         if (rc && !rc_test)
 673                 rc_test = rc;
 674
 675         rc = efx_test_nvram(efx, tests);
 676         if (rc && !rc_test)
 677                 rc_test = rc;
 678
 679         rc = efx_test_interrupts(efx, tests);
 680         if (rc && !rc_test)
 681                 rc_test = rc;
 682
 683         efx_for_each_channel(channel, efx) {
 684                 rc = efx_test_eventq_irq(channel, tests);
 685                 if (rc && !rc_test)
 686                         rc_test = rc;
 687         }
 688
 689         if (rc_test)
 690                 return rc_test;
 691
 692         if (!(flags & ETH_TEST_FL_OFFLINE))
 693                 return efx_test_phy(efx, tests, flags);
 694
 695         /* Offline (i.e. disruptive) testing
 696          * This checks MAC and PHY loopback on the specified port. */
 697
 698         /* Detach the device so the kernel doesn't transmit during the
 699          * loopback test and the watchdog timeout doesn't fire.
 700          */
 701         netif_device_detach(efx->net_dev);
 702
 703         mutex_lock(&efx->mac_lock);
 704         if (efx->loopback_modes) {
 705                 /* We need the 312 clock from the PHY to test the XMAC
 706                  * registers, so move into XGMII loopback if available */
 707                 if (efx->loopback_modes & (1 << LOOPBACK_XGMII))
 708                         efx->loopback_mode = LOOPBACK_XGMII;
 709                 else
 710                         efx->loopback_mode = __ffs(efx->loopback_modes);
 711         }
 712
 713         __efx_reconfigure_port(efx);
 714         mutex_unlock(&efx->mac_lock);
 715
 716         /* free up all consumers of SRAM (including all the queues) */
 717         efx_reset_down(efx, reset_method);
 718
 719         rc = efx_test_chip(efx, tests);
 720         if (rc && !rc_test)
 721                 rc_test = rc;
 722
 723         /* reset the chip to recover from the register test */
 724         rc_reset = efx->type->reset(efx, reset_method);
 725
 726         /* Ensure that the phy is powered and out of loopback
 727          * for the bist and loopback tests */
 728         efx->phy_mode &= ~PHY_MODE_LOW_POWER;
 729         efx->loopback_mode = LOOPBACK_NONE;
 730
 731         rc = efx_reset_up(efx, reset_method, rc_reset == 0);
 732         if (rc && !rc_reset)
 733                 rc_reset = rc;
 734
 735         if (rc_reset) {
 736                 netif_err(efx, drv, efx->net_dev,
 737                           "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         mutex_lock(&efx->mac_lock);
 752         efx->phy_mode = phy_mode;
 753         efx->loopback_mode = loopback_mode;
 754         __efx_reconfigure_port(efx);
 755         mutex_unlock(&efx->mac_lock);
 756
 757         netif_device_attach(efx->net_dev);
 758
 759         return rc_test;
 760 }
 761