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 "spi.h"
  30 #include "falcon_io.h"
  31 #include "mdio_10g.h"
  32
  33 /*
  34  * Loopback test packet structure
  35  *
  36  * The self-test should stress every RSS vector, and unfortunately
  37  * Falcon only performs RSS on TCP/UDP packets.
  38  */
  39 struct efx_loopback_payload {
  40         struct ethhdr header;
  41         struct iphdr ip;
  42         struct udphdr udp;
  43         __be16 iteration;
  44         const char msg[64];
  45 } __attribute__ ((packed));
  46
  47 /* Loopback test source MAC address */
  48 static const unsigned char payload_source[ETH_ALEN] = {
  49         0x00, 0x0f, 0x53, 0x1b, 0x1b, 0x1b,
  50 };
  51
  52 static const char *payload_msg =
  53         "Hello world! This is an Efx loopback test in progress!";
  54
  55 /**
  56  * efx_loopback_state - persistent state during a loopback selftest
  57  * @flush:              Drop all packets in efx_loopback_rx_packet
  58  * @packet_count:       Number of packets being used in this test
  59  * @skbs:               An array of skbs transmitted
  60  * @rx_good:            RX good packet count
  61  * @rx_bad:             RX bad packet count
  62  * @payload:            Payload used in tests
  63  */
  64 struct efx_loopback_state {
  65         bool flush;
  66         int packet_count;
  67         struct sk_buff **skbs;
  68
  69         /* Checksums are being offloaded */
  70         bool offload_csum;
  71
  72         atomic_t rx_good;
  73         atomic_t rx_bad;
  74         struct efx_loopback_payload payload;
  75 };
  76
  77 /**************************************************************************
  78  *
  79  * MII, NVRAM and register tests
  80  *
  81  **************************************************************************/
  82
  83 static int efx_test_mdio(struct efx_nic *efx, struct efx_self_tests *tests)
  84 {
  85         int rc = 0;
  86         int devad = __ffs(efx->mdio.mmds);
  87         u16 physid1, physid2;
  88
  89         if (efx->phy_type == PHY_TYPE_NONE)
  90                 return 0;
  91
  92         mutex_lock(&efx->mac_lock);
  93         tests->mdio = -1;
  94
  95         physid1 = efx_mdio_read(efx, devad, MDIO_DEVID1);
  96         physid2 = efx_mdio_read(efx, devad, MDIO_DEVID2);
  97
  98         if ((physid1 == 0x0000) || (physid1 == 0xffff) ||
  99             (physid2 == 0x0000) || (physid2 == 0xffff)) {
 100                 EFX_ERR(efx, "no MDIO PHY present with ID %d\n",
 101                         efx->mdio.prtad);
 102                 rc = -EINVAL;
 103                 goto out;
 104         }
 105
 106         if (EFX_IS10G(efx)) {
 107                 rc = efx_mdio_check_mmds(efx, efx->phy_op->mmds, 0);
 108                 if (rc)
 109                         goto out;
 110         }
 111
 112 out:
 113         mutex_unlock(&efx->mac_lock);
 114         tests->mdio = rc ? -1 : 1;
 115         return rc;
 116 }
 117
 118 static int efx_test_nvram(struct efx_nic *efx, struct efx_self_tests *tests)
 119 {
 120         int rc;
 121
 122         rc = falcon_read_nvram(efx, NULL);
 123         tests->nvram = rc ? -1 : 1;
 124         return rc;
 125 }
 126
 127 static int efx_test_chip(struct efx_nic *efx, struct efx_self_tests *tests)
 128 {
 129         int rc;
 130
 131         /* Not supported on A-series silicon */
 132         if (falcon_rev(efx) < FALCON_REV_B0)
 133                 return 0;
 134
 135         rc = falcon_test_registers(efx);
 136         tests->registers = rc ? -1 : 1;
 137         return rc;
 138 }
 139
 140 /**************************************************************************
 141  *
 142  * Interrupt and event queue testing
 143  *
 144  **************************************************************************/
 145
 146 /* Test generation and receipt of interrupts */
 147 static int efx_test_interrupts(struct efx_nic *efx,
 148                                struct efx_self_tests *tests)
 149 {
 150         struct efx_channel *channel;
 151
 152         EFX_LOG(efx, "testing interrupts\n");
 153         tests->interrupt = -1;
 154
 155         /* Reset interrupt flag */
 156         efx->last_irq_cpu = -1;
 157         smp_wmb();
 158
 159         /* ACK each interrupting event queue. Receiving an interrupt due to
 160          * traffic before a test event is raised is considered a pass */
 161         efx_for_each_channel(channel, efx) {
 162                 if (channel->work_pending)
 163                         efx_process_channel_now(channel);
 164                 if (efx->last_irq_cpu >= 0)
 165                         goto success;
 166         }
 167
 168         falcon_generate_interrupt(efx);
 169
 170         /* Wait for arrival of test interrupt. */
 171         EFX_LOG(efx, "waiting for test interrupt\n");
 172         schedule_timeout_uninterruptible(HZ / 10);
 173         if (efx->last_irq_cpu >= 0)
 174                 goto success;
 175
 176         EFX_ERR(efx, "timed out waiting for interrupt\n");
 177         return -ETIMEDOUT;
 178
 179  success:
 180         EFX_LOG(efx, "test interrupt (mode %d) seen on CPU%d\n",
 181                 efx->interrupt_mode, efx->last_irq_cpu);
 182         tests->interrupt = 1;
 183         return 0;
 184 }
 185
 186 /* Test generation and receipt of interrupting events */
 187 static int efx_test_eventq_irq(struct efx_channel *channel,
 188                                struct efx_self_tests *tests)
 189 {
 190         unsigned int magic, count;
 191
 192         /* Channel specific code, limited to 20 bits */
 193         magic = (0x00010150 + channel->channel);
 194         EFX_LOG(channel->efx, "channel %d testing event queue with code %x\n",
 195                 channel->channel, magic);
 196
 197         tests->eventq_dma[channel->channel] = -1;
 198         tests->eventq_int[channel->channel] = -1;
 199         tests->eventq_poll[channel->channel] = -1;
 200
 201         /* Reset flag and zero magic word */
 202         channel->efx->last_irq_cpu = -1;
 203         channel->eventq_magic = 0;
 204         smp_wmb();
 205
 206         falcon_generate_test_event(channel, magic);
 207
 208         /* Wait for arrival of interrupt */
 209         count = 0;
 210         do {
 211                 schedule_timeout_uninterruptible(HZ / 100);
 212
 213                 if (channel->work_pending)
 214                         efx_process_channel_now(channel);
 215
 216                 if (channel->eventq_magic == magic)
 217                         goto eventq_ok;
 218         } while (++count < 2);
 219
 220         EFX_ERR(channel->efx, "channel %d timed out waiting for event queue\n",
 221                 channel->channel);
 222
 223         /* See if interrupt arrived */
 224         if (channel->efx->last_irq_cpu >= 0) {
 225                 EFX_ERR(channel->efx, "channel %d saw interrupt on CPU%d "
 226                         "during event queue test\n", channel->channel,
 227                         raw_smp_processor_id());
 228                 tests->eventq_int[channel->channel] = 1;
 229         }
 230
 231         /* Check to see if event was received even if interrupt wasn't */
 232         efx_process_channel_now(channel);
 233         if (channel->eventq_magic == magic) {
 234                 EFX_ERR(channel->efx, "channel %d event was generated, but "
 235                         "failed to trigger an interrupt\n", channel->channel);
 236                 tests->eventq_dma[channel->channel] = 1;
 237         }
 238
 239         return -ETIMEDOUT;
 240  eventq_ok:
 241         EFX_LOG(channel->efx, "channel %d event queue passed\n",
 242                 channel->channel);
 243         tests->eventq_dma[channel->channel] = 1;
 244         tests->eventq_int[channel->channel] = 1;
 245         tests->eventq_poll[channel->channel] = 1;
 246         return 0;
 247 }
 248
 249 static int efx_test_phy(struct efx_nic *efx, struct efx_self_tests *tests,
 250                         unsigned flags)
 251 {
 252         int rc;
 253
 254         if (!efx->phy_op->run_tests)
 255                 return 0;
 256
 257         EFX_BUG_ON_PARANOID(efx->phy_op->num_tests == 0 ||
 258                             efx->phy_op->num_tests > EFX_MAX_PHY_TESTS);
 259
 260         mutex_lock(&efx->mac_lock);
 261         rc = efx->phy_op->run_tests(efx, tests->phy, flags);
 262         mutex_unlock(&efx->mac_lock);
 263         return rc;
 264 }
 265
 266 /**************************************************************************
 267  *
 268  * Loopback testing
 269  * NB Only one loopback test can be executing concurrently.
 270  *
 271  **************************************************************************/
 272
 273 /* Loopback test RX callback
 274  * This is called for each received packet during loopback testing.
 275  */
 276 void efx_loopback_rx_packet(struct efx_nic *efx,
 277                             const char *buf_ptr, int pkt_len)
 278 {
 279         struct efx_loopback_state *state = efx->loopback_selftest;
 280         struct efx_loopback_payload *received;
 281         struct efx_loopback_payload *payload;
 282
 283         BUG_ON(!buf_ptr);
 284
 285         /* If we are just flushing, then drop the packet */
 286         if ((state == NULL) || state->flush)
 287                 return;
 288
 289         payload = &state->payload;
 290
 291         received = (struct efx_loopback_payload *) buf_ptr;
 292         received->ip.saddr = payload->ip.saddr;
 293         if (state->offload_csum)
 294                 received->ip.check = payload->ip.check;
 295
 296         /* Check that header exists */
 297         if (pkt_len < sizeof(received->header)) {
 298                 EFX_ERR(efx, "saw runt RX packet (length %d) in %s loopback "
 299                         "test\n", pkt_len, LOOPBACK_MODE(efx));
 300                 goto err;
 301         }
 302
 303         /* Check that the ethernet header exists */
 304         if (memcmp(&received->header, &payload->header, ETH_HLEN) != 0) {
 305                 EFX_ERR(efx, "saw non-loopback RX packet in %s loopback test\n",
 306                         LOOPBACK_MODE(efx));
 307                 goto err;
 308         }
 309
 310         /* Check packet length */
 311         if (pkt_len != sizeof(*payload)) {
 312                 EFX_ERR(efx, "saw incorrect RX packet length %d (wanted %d) in "
 313                         "%s loopback test\n", pkt_len, (int)sizeof(*payload),
 314                         LOOPBACK_MODE(efx));
 315                 goto err;
 316         }
 317
 318         /* Check that IP header matches */
 319         if (memcmp(&received->ip, &payload->ip, sizeof(payload->ip)) != 0) {
 320                 EFX_ERR(efx, "saw corrupted IP header in %s loopback test\n",
 321                         LOOPBACK_MODE(efx));
 322                 goto err;
 323         }
 324
 325         /* Check that msg and padding matches */
 326         if (memcmp(&received->msg, &payload->msg, sizeof(received->msg)) != 0) {
 327                 EFX_ERR(efx, "saw corrupted RX packet in %s loopback test\n",
 328                         LOOPBACK_MODE(efx));
 329                 goto err;
 330         }
 331
 332         /* Check that iteration matches */
 333         if (received->iteration != payload->iteration) {
 334                 EFX_ERR(efx, "saw RX packet from iteration %d (wanted %d) in "
 335                         "%s loopback test\n", ntohs(received->iteration),
 336                         ntohs(payload->iteration), LOOPBACK_MODE(efx));
 337                 goto err;
 338         }
 339
 340         /* Increase correct RX count */
 341         EFX_TRACE(efx, "got loopback RX in %s loopback test\n",
 342                   LOOPBACK_MODE(efx));
 343
 344         atomic_inc(&state->rx_good);
 345         return;
 346
 347  err:
 348 #ifdef EFX_ENABLE_DEBUG
 349         if (atomic_read(&state->rx_bad) == 0) {
 350                 EFX_ERR(efx, "received packet:\n");
 351                 print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 0x10, 1,
 352                                buf_ptr, pkt_len, 0);
 353                 EFX_ERR(efx, "expected packet:\n");
 354                 print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 0x10, 1,
 355                                &state->payload, sizeof(state->payload), 0);
 356         }
 357 #endif
 358         atomic_inc(&state->rx_bad);
 359 }
 360
 361 /* Initialise an efx_selftest_state for a new iteration */
 362 static void efx_iterate_state(struct efx_nic *efx)
 363 {
 364         struct efx_loopback_state *state = efx->loopback_selftest;
 365         struct net_device *net_dev = efx->net_dev;
 366         struct efx_loopback_payload *payload = &state->payload;
 367
 368         /* Initialise the layerII header */
 369         memcpy(&payload->header.h_dest, net_dev->dev_addr, ETH_ALEN);
 370         memcpy(&payload->header.h_source, &payload_source, ETH_ALEN);
 371         payload->header.h_proto = htons(ETH_P_IP);
 372
 373         /* saddr set later and used as incrementing count */
 374         payload->ip.daddr = htonl(INADDR_LOOPBACK);
 375         payload->ip.ihl = 5;
 376         payload->ip.check = htons(0xdead);
 377         payload->ip.tot_len = htons(sizeof(*payload) - sizeof(struct ethhdr));
 378         payload->ip.version = IPVERSION;
 379         payload->ip.protocol = IPPROTO_UDP;
 380
 381         /* Initialise udp header */
 382         payload->udp.source = 0;
 383         payload->udp.len = htons(sizeof(*payload) - sizeof(struct ethhdr) -
 384                                  sizeof(struct iphdr));
 385         payload->udp.check = 0; /* checksum ignored */
 386
 387         /* Fill out payload */
 388         payload->iteration = htons(ntohs(payload->iteration) + 1);
 389         memcpy(&payload->msg, payload_msg, sizeof(payload_msg));
 390
 391         /* Fill out remaining state members */
 392         atomic_set(&state->rx_good, 0);
 393         atomic_set(&state->rx_bad, 0);
 394         smp_wmb();
 395 }
 396
 397 static int efx_begin_loopback(struct efx_tx_queue *tx_queue)
 398 {
 399         struct efx_nic *efx = tx_queue->efx;
 400         struct efx_loopback_state *state = efx->loopback_selftest;
 401         struct efx_loopback_payload *payload;
 402         struct sk_buff *skb;
 403         int i;
 404         netdev_tx_t 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                 efx->net_dev->trans_start = jiffies;
 443         }
 444
 445         return 0;
 446 }
 447
 448 static int efx_poll_loopback(struct efx_nic *efx)
 449 {
 450         struct efx_loopback_state *state = efx->loopback_selftest;
 451         struct efx_channel *channel;
 452
 453         /* NAPI polling is not enabled, so process channels
 454          * synchronously */
 455         efx_for_each_channel(channel, efx) {
 456                 if (channel->work_pending)
 457                         efx_process_channel_now(channel);
 458         }
 459         return atomic_read(&state->rx_good) == state->packet_count;
 460 }
 461
 462 static int efx_end_loopback(struct efx_tx_queue *tx_queue,
 463                             struct efx_loopback_self_tests *lb_tests)
 464 {
 465         struct efx_nic *efx = tx_queue->efx;
 466         struct efx_loopback_state *state = efx->loopback_selftest;
 467         struct sk_buff *skb;
 468         int tx_done = 0, rx_good, rx_bad;
 469         int i, rc = 0;
 470
 471         if (efx_dev_registered(efx))
 472                 netif_tx_lock_bh(efx->net_dev);
 473
 474         /* Count the number of tx completions, and decrement the refcnt. Any
 475          * skbs not already completed will be free'd when the queue is flushed */
 476         for (i=0; i < state->packet_count; i++) {
 477                 skb = state->skbs[i];
 478                 if (skb && !skb_shared(skb))
 479                         ++tx_done;
 480                 dev_kfree_skb_any(skb);
 481         }
 482
 483         if (efx_dev_registered(efx))
 484                 netif_tx_unlock_bh(efx->net_dev);
 485
 486         /* Check TX completion and received packet counts */
 487         rx_good = atomic_read(&state->rx_good);
 488         rx_bad = atomic_read(&state->rx_bad);
 489         if (tx_done != state->packet_count) {
 490                 /* Don't free the skbs; they will be picked up on TX
 491                  * overflow or channel teardown.
 492                  */
 493                 EFX_ERR(efx, "TX queue %d saw only %d out of an expected %d "
 494                         "TX completion events in %s loopback test\n",
 495                         tx_queue->queue, tx_done, state->packet_count,
 496                         LOOPBACK_MODE(efx));
 497                 rc = -ETIMEDOUT;
 498                 /* Allow to fall through so we see the RX errors as well */
 499         }
 500
 501         /* We may always be up to a flush away from our desired packet total */
 502         if (rx_good != state->packet_count) {
 503                 EFX_LOG(efx, "TX queue %d saw only %d out of an expected %d "
 504                         "received packets in %s loopback test\n",
 505                         tx_queue->queue, rx_good, state->packet_count,
 506                         LOOPBACK_MODE(efx));
 507                 rc = -ETIMEDOUT;
 508                 /* Fall through */
 509         }
 510
 511         /* Update loopback test structure */
 512         lb_tests->tx_sent[tx_queue->queue] += state->packet_count;
 513         lb_tests->tx_done[tx_queue->queue] += tx_done;
 514         lb_tests->rx_good += rx_good;
 515         lb_tests->rx_bad += rx_bad;
 516
 517         return rc;
 518 }
 519
 520 static int
 521 efx_test_loopback(struct efx_tx_queue *tx_queue,
 522                   struct efx_loopback_self_tests *lb_tests)
 523 {
 524         struct efx_nic *efx = tx_queue->efx;
 525         struct efx_loopback_state *state = efx->loopback_selftest;
 526         int i, begin_rc, end_rc;
 527
 528         for (i = 0; i < 3; i++) {
 529                 /* Determine how many packets to send */
 530                 state->packet_count = (efx->type->txd_ring_mask + 1) / 3;
 531                 state->packet_count = min(1 << (i << 2), state->packet_count);
 532                 state->skbs = kzalloc(sizeof(state->skbs[0]) *
 533                                       state->packet_count, GFP_KERNEL);
 534                 if (!state->skbs)
 535                         return -ENOMEM;
 536                 state->flush = false;
 537
 538                 EFX_LOG(efx, "TX queue %d testing %s loopback with %d "
 539                         "packets\n", tx_queue->queue, LOOPBACK_MODE(efx),
 540                         state->packet_count);
 541
 542                 efx_iterate_state(efx);
 543                 begin_rc = efx_begin_loopback(tx_queue);
 544
 545                 /* This will normally complete very quickly, but be
 546                  * prepared to wait up to 100 ms. */
 547                 msleep(1);
 548                 if (!efx_poll_loopback(efx)) {
 549                         msleep(100);
 550                         efx_poll_loopback(efx);
 551                 }
 552
 553                 end_rc = efx_end_loopback(tx_queue, lb_tests);
 554                 kfree(state->skbs);
 555
 556                 if (begin_rc || end_rc) {
 557                         /* Wait a while to ensure there are no packets
 558                          * floating around after a failure. */
 559                         schedule_timeout_uninterruptible(HZ / 10);
 560                         return begin_rc ? begin_rc : end_rc;
 561                 }
 562         }
 563
 564         EFX_LOG(efx, "TX queue %d passed %s loopback test with a burst length "
 565                 "of %d packets\n", tx_queue->queue, LOOPBACK_MODE(efx),
 566                 state->packet_count);
 567
 568         return 0;
 569 }
 570
 571 static int efx_test_loopbacks(struct efx_nic *efx, struct efx_self_tests *tests,
 572                               unsigned int loopback_modes)
 573 {
 574         enum efx_loopback_mode mode;
 575         struct efx_loopback_state *state;
 576         struct efx_tx_queue *tx_queue;
 577         bool link_up;
 578         int count, rc = 0;
 579
 580         /* Set the port loopback_selftest member. From this point on
 581          * all received packets will be dropped. Mark the state as
 582          * "flushing" so all inflight packets are dropped */
 583         state = kzalloc(sizeof(*state), GFP_KERNEL);
 584         if (state == NULL)
 585                 return -ENOMEM;
 586         BUG_ON(efx->loopback_selftest);
 587         state->flush = true;
 588         efx->loopback_selftest = state;
 589
 590         /* Test all supported loopback modes */
 591         for (mode = LOOPBACK_NONE; mode <= LOOPBACK_TEST_MAX; mode++) {
 592                 if (!(loopback_modes & (1 << mode)))
 593                         continue;
 594
 595                 /* Move the port into the specified loopback mode. */
 596                 state->flush = true;
 597                 efx->loopback_mode = mode;
 598                 efx_reconfigure_port(efx);
 599
 600                 /* Wait for the PHY to signal the link is up. Interrupts
 601                  * are enabled for PHY's using LASI, otherwise we poll()
 602                  * quickly */
 603                 count = 0;
 604                 do {
 605                         struct efx_channel *channel = &efx->channel[0];
 606
 607                         efx->phy_op->poll(efx);
 608                         schedule_timeout_uninterruptible(HZ / 10);
 609                         if (channel->work_pending)
 610                                 efx_process_channel_now(channel);
 611                         /* Wait for PHY events to be processed */
 612                         flush_workqueue(efx->workqueue);
 613                         rmb();
 614
 615                         /* We need both the phy and xaui links to be ok.
 616                          * rather than relying on the falcon_xmac irq/poll
 617                          * regime, just poll xaui directly */
 618                         link_up = efx->link_up;
 619                         if (link_up && EFX_IS10G(efx) &&
 620                             !falcon_xaui_link_ok(efx))
 621                                 link_up = false;
 622
 623                 } while ((++count < 20) && !link_up);
 624
 625                 /* The link should now be up. If it isn't, there is no point
 626                  * in attempting a loopback test */
 627                 if (!link_up) {
 628                         EFX_ERR(efx, "loopback %s never came up\n",
 629                                 LOOPBACK_MODE(efx));
 630                         rc = -EIO;
 631                         goto out;
 632                 }
 633
 634                 EFX_LOG(efx, "link came up in %s loopback in %d iterations\n",
 635                         LOOPBACK_MODE(efx), count);
 636
 637                 /* Test every TX queue */
 638                 efx_for_each_tx_queue(tx_queue, efx) {
 639                         state->offload_csum = (tx_queue->queue ==
 640                                                EFX_TX_QUEUE_OFFLOAD_CSUM);
 641                         rc = efx_test_loopback(tx_queue,
 642                                                &tests->loopback[mode]);
 643                         if (rc)
 644                                 goto out;
 645                 }
 646         }
 647
 648  out:
 649         /* Remove the flush. The caller will remove the loopback setting */
 650         state->flush = true;
 651         efx->loopback_selftest = NULL;
 652         wmb();
 653         kfree(state);
 654
 655         return rc;
 656 }
 657
 658 /**************************************************************************
 659  *
 660  * Entry point
 661  *
 662  *************************************************************************/
 663
 664 int efx_selftest(struct efx_nic *efx, struct efx_self_tests *tests,
 665                  unsigned flags)
 666 {
 667         enum efx_loopback_mode loopback_mode = efx->loopback_mode;
 668         int phy_mode = efx->phy_mode;
 669         enum reset_type reset_method = RESET_TYPE_INVISIBLE;
 670         struct ethtool_cmd ecmd;
 671         struct efx_channel *channel;
 672         int rc_test = 0, rc_reset = 0, rc;
 673
 674         /* Online (i.e. non-disruptive) testing
 675          * This checks interrupt generation, event delivery and PHY presence. */
 676
 677         rc = efx_test_mdio(efx, tests);
 678         if (rc && !rc_test)
 679                 rc_test = rc;
 680
 681         rc = efx_test_nvram(efx, tests);
 682         if (rc && !rc_test)
 683                 rc_test = rc;
 684
 685         rc = efx_test_interrupts(efx, tests);
 686         if (rc && !rc_test)
 687                 rc_test = rc;
 688
 689         efx_for_each_channel(channel, efx) {
 690                 rc = efx_test_eventq_irq(channel, tests);
 691                 if (rc && !rc_test)
 692                         rc_test = rc;
 693         }
 694
 695         if (rc_test)
 696                 return rc_test;
 697
 698         if (!(flags & ETH_TEST_FL_OFFLINE))
 699                 return efx_test_phy(efx, tests, flags);
 700
 701         /* Offline (i.e. disruptive) testing
 702          * This checks MAC and PHY loopback on the specified port. */
 703
 704         /* force the carrier state off so the kernel doesn't transmit during
 705          * the loopback test, and the watchdog timeout doesn't fire. Also put
 706          * falcon into loopback for the register test.
 707          */
 708         mutex_lock(&efx->mac_lock);
 709         efx->port_inhibited = true;
 710         if (efx->loopback_modes) {
 711                 /* We need the 312 clock from the PHY to test the XMAC
 712                  * registers, so move into XGMII loopback if available */
 713                 if (efx->loopback_modes & (1 << LOOPBACK_XGMII))
 714                         efx->loopback_mode = LOOPBACK_XGMII;
 715                 else
 716                         efx->loopback_mode = __ffs(efx->loopback_modes);
 717         }
 718
 719         __efx_reconfigure_port(efx);
 720         mutex_unlock(&efx->mac_lock);
 721
 722         /* free up all consumers of SRAM (including all the queues) */
 723         efx_reset_down(efx, reset_method, &ecmd);
 724
 725         rc = efx_test_chip(efx, tests);
 726         if (rc && !rc_test)
 727                 rc_test = rc;
 728
 729         /* reset the chip to recover from the register test */
 730         rc_reset = falcon_reset_hw(efx, reset_method);
 731
 732         /* Ensure that the phy is powered and out of loopback
 733          * for the bist and loopback tests */
 734         efx->phy_mode &= ~PHY_MODE_LOW_POWER;
 735         efx->loopback_mode = LOOPBACK_NONE;
 736
 737         rc = efx_reset_up(efx, reset_method, &ecmd, rc_reset == 0);
 738         if (rc && !rc_reset)
 739                 rc_reset = rc;
 740
 741         if (rc_reset) {
 742                 EFX_ERR(efx, "Unable to recover from chip test\n");
 743                 efx_schedule_reset(efx, RESET_TYPE_DISABLE);
 744                 return rc_reset;
 745         }
 746
 747         rc = efx_test_phy(efx, tests, flags);
 748         if (rc && !rc_test)
 749                 rc_test = rc;
 750
 751         rc = efx_test_loopbacks(efx, tests, efx->loopback_modes);
 752         if (rc && !rc_test)
 753                 rc_test = rc;
 754
 755         /* restore the PHY to the previous state */
 756         efx->loopback_mode = loopback_mode;
 757         efx->phy_mode = phy_mode;
 758         efx->port_inhibited = false;
 759         efx_ethtool_set_settings(efx->net_dev, &ecmd);
 760
 761         return rc_test;
 762 }
 763