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1/****************************************************************************
2 * Driver for Solarflare network controllers and boards
3 * Copyright 2005-2006 Fen Systems Ltd.
4 * Copyright 2006-2012 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 "net_driver.h"
23#include "efx.h"
24#include "nic.h"
25#include "selftest.h"
26#include "workarounds.h"
27
28/* IRQ latency can be enormous because:
29 * - All IRQs may be disabled on a CPU for a *long* time by e.g. a
30 * slow serial console or an old IDE driver doing error recovery
31 * - The PREEMPT_RT patches mostly deal with this, but also allow a
32 * tasklet or normal task to be given higher priority than our IRQ
33 * threads
34 * Try to avoid blaming the hardware for this.
35 */
36#define IRQ_TIMEOUT HZ
37
38/*
39 * Loopback test packet structure
40 *
41 * The self-test should stress every RSS vector, and unfortunately
42 * Falcon only performs RSS on TCP/UDP packets.
43 */
44struct efx_loopback_payload {
45 struct ethhdr header;
46 struct iphdr ip;
47 struct udphdr udp;
48 __be16 iteration;
49 const char msg[64];
50} __packed;
51
52/* Loopback test source MAC address */
53static const u8 payload_source[ETH_ALEN] __aligned(2) = {
54 0x00, 0x0f, 0x53, 0x1b, 0x1b, 0x1b,
55};
56
57static const char payload_msg[] =
58 "Hello world! This is an Efx loopback test in progress!";
59
60/* Interrupt mode names */
61static const unsigned int efx_interrupt_mode_max = EFX_INT_MODE_MAX;
62static const char *const efx_interrupt_mode_names[] = {
63 [EFX_INT_MODE_MSIX] = "MSI-X",
64 [EFX_INT_MODE_MSI] = "MSI",
65 [EFX_INT_MODE_LEGACY] = "legacy",
66};
67#define INT_MODE(efx) \
68 STRING_TABLE_LOOKUP(efx->interrupt_mode, efx_interrupt_mode)
69
70/**
71 * efx_loopback_state - persistent state during a loopback selftest
72 * @flush: Drop all packets in efx_loopback_rx_packet
73 * @packet_count: Number of packets being used in this test
74 * @skbs: An array of skbs transmitted
75 * @offload_csum: Checksums are being offloaded
76 * @rx_good: RX good packet count
77 * @rx_bad: RX bad packet count
78 * @payload: Payload used in tests
79 */
80struct efx_loopback_state {
81 bool flush;
82 int packet_count;
83 struct sk_buff **skbs;
84 bool offload_csum;
85 atomic_t rx_good;
86 atomic_t rx_bad;
87 struct efx_loopback_payload payload;
88};
89
90/* How long to wait for all the packets to arrive (in ms) */
91#define LOOPBACK_TIMEOUT_MS 1000
92
93/**************************************************************************
94 *
95 * MII, NVRAM and register tests
96 *
97 **************************************************************************/
98
99static int efx_test_phy_alive(struct efx_nic *efx, struct efx_self_tests *tests)
100{
101 int rc = 0;
102
103 if (efx->phy_op->test_alive) {
104 rc = efx->phy_op->test_alive(efx);
105 tests->phy_alive = rc ? -1 : 1;
106 }
107
108 return rc;
109}
110
111static int efx_test_nvram(struct efx_nic *efx, struct efx_self_tests *tests)
112{
113 int rc = 0;
114
115 if (efx->type->test_nvram) {
116 rc = efx->type->test_nvram(efx);
117 tests->nvram = rc ? -1 : 1;
118 }
119
120 return rc;
121}
122
123/**************************************************************************
124 *
125 * Interrupt and event queue testing
126 *
127 **************************************************************************/
128
129/* Test generation and receipt of interrupts */
130static int efx_test_interrupts(struct efx_nic *efx,
131 struct efx_self_tests *tests)
132{
133 unsigned long timeout, wait;
134 int cpu;
135
136 netif_dbg(efx, drv, efx->net_dev, "testing interrupts\n");
137 tests->interrupt = -1;
138
139 efx_nic_irq_test_start(efx);
140 timeout = jiffies + IRQ_TIMEOUT;
141 wait = 1;
142
143 /* Wait for arrival of test interrupt. */
144 netif_dbg(efx, drv, efx->net_dev, "waiting for test interrupt\n");
145 do {
146 schedule_timeout_uninterruptible(wait);
147 cpu = efx_nic_irq_test_irq_cpu(efx);
148 if (cpu >= 0)
149 goto success;
150 wait *= 2;
151 } while (time_before(jiffies, timeout));
152
153 netif_err(efx, drv, efx->net_dev, "timed out waiting for interrupt\n");
154 return -ETIMEDOUT;
155
156 success:
157 netif_dbg(efx, drv, efx->net_dev, "%s test interrupt seen on CPU%d\n",
158 INT_MODE(efx), cpu);
159 tests->interrupt = 1;
160 return 0;
161}
162
163/* Test generation and receipt of interrupting events */
164static int efx_test_eventq_irq(struct efx_nic *efx,
165 struct efx_self_tests *tests)
166{
167 struct efx_channel *channel;
168 unsigned int read_ptr[EFX_MAX_CHANNELS];
169 unsigned long napi_ran = 0, dma_pend = 0, int_pend = 0;
170 unsigned long timeout, wait;
171
172 BUILD_BUG_ON(EFX_MAX_CHANNELS > BITS_PER_LONG);
173
174 efx_for_each_channel(channel, efx) {
175 read_ptr[channel->channel] = channel->eventq_read_ptr;
176 set_bit(channel->channel, &dma_pend);
177 set_bit(channel->channel, &int_pend);
178 efx_nic_event_test_start(channel);
179 }
180
181 timeout = jiffies + IRQ_TIMEOUT;
182 wait = 1;
183
184 /* Wait for arrival of interrupts. NAPI processing may or may
185 * not complete in time, but we can cope in any case.
186 */
187 do {
188 schedule_timeout_uninterruptible(wait);
189
190 efx_for_each_channel(channel, efx) {
191 napi_disable(&channel->napi_str);
192 if (channel->eventq_read_ptr !=
193 read_ptr[channel->channel]) {
194 set_bit(channel->channel, &napi_ran);
195 clear_bit(channel->channel, &dma_pend);
196 clear_bit(channel->channel, &int_pend);
197 } else {
198 if (efx_nic_event_present(channel))
199 clear_bit(channel->channel, &dma_pend);
200 if (efx_nic_event_test_irq_cpu(channel) >= 0)
201 clear_bit(channel->channel, &int_pend);
202 }
203 napi_enable(&channel->napi_str);
204 efx_nic_eventq_read_ack(channel);
205 }
206
207 wait *= 2;
208 } while ((dma_pend || int_pend) && time_before(jiffies, timeout));
209
210 efx_for_each_channel(channel, efx) {
211 bool dma_seen = !test_bit(channel->channel, &dma_pend);
212 bool int_seen = !test_bit(channel->channel, &int_pend);
213
214 tests->eventq_dma[channel->channel] = dma_seen ? 1 : -1;
215 tests->eventq_int[channel->channel] = int_seen ? 1 : -1;
216
217 if (dma_seen && int_seen) {
218 netif_dbg(efx, drv, efx->net_dev,
219 "channel %d event queue passed (with%s NAPI)\n",
220 channel->channel,
221 test_bit(channel->channel, &napi_ran) ?
222 "" : "out");
223 } else {
224 /* Report failure and whether either interrupt or DMA
225 * worked
226 */
227 netif_err(efx, drv, efx->net_dev,
228 "channel %d timed out waiting for event queue\n",
229 channel->channel);
230 if (int_seen)
231 netif_err(efx, drv, efx->net_dev,
232 "channel %d saw interrupt "
233 "during event queue test\n",
234 channel->channel);
235 if (dma_seen)
236 netif_err(efx, drv, efx->net_dev,
237 "channel %d event was generated, but "
238 "failed to trigger an interrupt\n",
239 channel->channel);
240 }
241 }
242
243 return (dma_pend || int_pend) ? -ETIMEDOUT : 0;
244}
245
246static int efx_test_phy(struct efx_nic *efx, struct efx_self_tests *tests,
247 unsigned flags)
248{
249 int rc;
250
251 if (!efx->phy_op->run_tests)
252 return 0;
253
254 mutex_lock(&efx->mac_lock);
255 rc = efx->phy_op->run_tests(efx, tests->phy_ext, flags);
256 mutex_unlock(&efx->mac_lock);
257 return rc;
258}
259
260/**************************************************************************
261 *
262 * Loopback testing
263 * NB Only one loopback test can be executing concurrently.
264 *
265 **************************************************************************/
266
267/* Loopback test RX callback
268 * This is called for each received packet during loopback testing.
269 */
270void efx_loopback_rx_packet(struct efx_nic *efx,
271 const char *buf_ptr, int pkt_len)
272{
273 struct efx_loopback_state *state = efx->loopback_selftest;
274 struct efx_loopback_payload *received;
275 struct efx_loopback_payload *payload;
276
277 BUG_ON(!buf_ptr);
278
279 /* If we are just flushing, then drop the packet */
280 if ((state == NULL) || state->flush)
281 return;
282
283 payload = &state->payload;
284
285 received = (struct efx_loopback_payload *) buf_ptr;
286 received->ip.saddr = payload->ip.saddr;
287 if (state->offload_csum)
288 received->ip.check = payload->ip.check;
289
290 /* Check that header exists */
291 if (pkt_len < sizeof(received->header)) {
292 netif_err(efx, drv, efx->net_dev,
293 "saw runt RX packet (length %d) in %s loopback "
294 "test\n", pkt_len, LOOPBACK_MODE(efx));
295 goto err;
296 }
297
298 /* Check that the ethernet header exists */
299 if (memcmp(&received->header, &payload->header, ETH_HLEN) != 0) {
300 netif_err(efx, drv, efx->net_dev,
301 "saw non-loopback RX packet in %s loopback test\n",
302 LOOPBACK_MODE(efx));
303 goto err;
304 }
305
306 /* Check packet length */
307 if (pkt_len != sizeof(*payload)) {
308 netif_err(efx, drv, efx->net_dev,
309 "saw incorrect RX packet length %d (wanted %d) in "
310 "%s loopback test\n", pkt_len, (int)sizeof(*payload),
311 LOOPBACK_MODE(efx));
312 goto err;
313 }
314
315 /* Check that IP header matches */
316 if (memcmp(&received->ip, &payload->ip, sizeof(payload->ip)) != 0) {
317 netif_err(efx, drv, efx->net_dev,
318 "saw corrupted IP header in %s loopback test\n",
319 LOOPBACK_MODE(efx));
320 goto err;
321 }
322
323 /* Check that msg and padding matches */
324 if (memcmp(&received->msg, &payload->msg, sizeof(received->msg)) != 0) {
325 netif_err(efx, drv, efx->net_dev,
326 "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 netif_err(efx, drv, efx->net_dev,
334 "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 netif_vdbg(efx, drv, efx->net_dev,
342 "got loopback RX in %s loopback test\n", LOOPBACK_MODE(efx));
343
344 atomic_inc(&state->rx_good);
345 return;
346
347 err:
348#ifdef DEBUG
349 if (atomic_read(&state->rx_bad) == 0) {
350 netif_err(efx, drv, efx->net_dev, "received packet:\n");
351 print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 0x10, 1,
352 buf_ptr, pkt_len, 0);
353 netif_err(efx, drv, efx->net_dev, "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 */
362static 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 ether_addr_copy((u8 *)&payload->header.h_dest, net_dev->dev_addr);
370 ether_addr_copy((u8 *)&payload->header.h_source, payload_source);
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 = (__force __sum16) 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
397static 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 netif_tx_lock_bh(efx->net_dev);
428 rc = efx_enqueue_skb(tx_queue, skb);
429 netif_tx_unlock_bh(efx->net_dev);
430
431 if (rc != NETDEV_TX_OK) {
432 netif_err(efx, drv, efx->net_dev,
433 "TX queue %d could not transmit packet %d of "
434 "%d in %s loopback test\n", tx_queue->queue,
435 i + 1, state->packet_count,
436 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
447static int efx_poll_loopback(struct efx_nic *efx)
448{
449 struct efx_loopback_state *state = efx->loopback_selftest;
450
451 return atomic_read(&state->rx_good) == state->packet_count;
452}
453
454static int efx_end_loopback(struct efx_tx_queue *tx_queue,
455 struct efx_loopback_self_tests *lb_tests)
456{
457 struct efx_nic *efx = tx_queue->efx;
458 struct efx_loopback_state *state = efx->loopback_selftest;
459 struct sk_buff *skb;
460 int tx_done = 0, rx_good, rx_bad;
461 int i, rc = 0;
462
463 netif_tx_lock_bh(efx->net_dev);
464
465 /* Count the number of tx completions, and decrement the refcnt. Any
466 * skbs not already completed will be free'd when the queue is flushed */
467 for (i = 0; i < state->packet_count; i++) {
468 skb = state->skbs[i];
469 if (skb && !skb_shared(skb))
470 ++tx_done;
471 dev_kfree_skb(skb);
472 }
473
474 netif_tx_unlock_bh(efx->net_dev);
475
476 /* Check TX completion and received packet counts */
477 rx_good = atomic_read(&state->rx_good);
478 rx_bad = atomic_read(&state->rx_bad);
479 if (tx_done != state->packet_count) {
480 /* Don't free the skbs; they will be picked up on TX
481 * overflow or channel teardown.
482 */
483 netif_err(efx, drv, efx->net_dev,
484 "TX queue %d saw only %d out of an expected %d "
485 "TX completion events in %s loopback test\n",
486 tx_queue->queue, tx_done, state->packet_count,
487 LOOPBACK_MODE(efx));
488 rc = -ETIMEDOUT;
489 /* Allow to fall through so we see the RX errors as well */
490 }
491
492 /* We may always be up to a flush away from our desired packet total */
493 if (rx_good != state->packet_count) {
494 netif_dbg(efx, drv, efx->net_dev,
495 "TX queue %d saw only %d out of an expected %d "
496 "received packets in %s loopback test\n",
497 tx_queue->queue, rx_good, state->packet_count,
498 LOOPBACK_MODE(efx));
499 rc = -ETIMEDOUT;
500 /* Fall through */
501 }
502
503 /* Update loopback test structure */
504 lb_tests->tx_sent[tx_queue->queue] += state->packet_count;
505 lb_tests->tx_done[tx_queue->queue] += tx_done;
506 lb_tests->rx_good += rx_good;
507 lb_tests->rx_bad += rx_bad;
508
509 return rc;
510}
511
512static int
513efx_test_loopback(struct efx_tx_queue *tx_queue,
514 struct efx_loopback_self_tests *lb_tests)
515{
516 struct efx_nic *efx = tx_queue->efx;
517 struct efx_loopback_state *state = efx->loopback_selftest;
518 int i, begin_rc, end_rc;
519
520 for (i = 0; i < 3; i++) {
521 /* Determine how many packets to send */
522 state->packet_count = efx->txq_entries / 3;
523 state->packet_count = min(1 << (i << 2), state->packet_count);
524 state->skbs = kcalloc(state->packet_count,
525 sizeof(state->skbs[0]), GFP_KERNEL);
526 if (!state->skbs)
527 return -ENOMEM;
528 state->flush = false;
529
530 netif_dbg(efx, drv, efx->net_dev,
531 "TX queue %d testing %s loopback with %d packets\n",
532 tx_queue->queue, LOOPBACK_MODE(efx),
533 state->packet_count);
534
535 efx_iterate_state(efx);
536 begin_rc = efx_begin_loopback(tx_queue);
537
538 /* This will normally complete very quickly, but be
539 * prepared to wait much longer. */
540 msleep(1);
541 if (!efx_poll_loopback(efx)) {
542 msleep(LOOPBACK_TIMEOUT_MS);
543 efx_poll_loopback(efx);
544 }
545
546 end_rc = efx_end_loopback(tx_queue, lb_tests);
547 kfree(state->skbs);
548
549 if (begin_rc || end_rc) {
550 /* Wait a while to ensure there are no packets
551 * floating around after a failure. */
552 schedule_timeout_uninterruptible(HZ / 10);
553 return begin_rc ? begin_rc : end_rc;
554 }
555 }
556
557 netif_dbg(efx, drv, efx->net_dev,
558 "TX queue %d passed %s loopback test with a burst length "
559 "of %d packets\n", tx_queue->queue, LOOPBACK_MODE(efx),
560 state->packet_count);
561
562 return 0;
563}
564
565/* Wait for link up. On Falcon, we would prefer to rely on efx_monitor, but
566 * any contention on the mac lock (via e.g. efx_mac_mcast_work) causes it
567 * to delay and retry. Therefore, it's safer to just poll directly. Wait
568 * for link up and any faults to dissipate. */
569static int efx_wait_for_link(struct efx_nic *efx)
570{
571 struct efx_link_state *link_state = &efx->link_state;
572 int count, link_up_count = 0;
573 bool link_up;
574
575 for (count = 0; count < 40; count++) {
576 schedule_timeout_uninterruptible(HZ / 10);
577
578 if (efx->type->monitor != NULL) {
579 mutex_lock(&efx->mac_lock);
580 efx->type->monitor(efx);
581 mutex_unlock(&efx->mac_lock);
582 }
583
584 mutex_lock(&efx->mac_lock);
585 link_up = link_state->up;
586 if (link_up)
587 link_up = !efx->type->check_mac_fault(efx);
588 mutex_unlock(&efx->mac_lock);
589
590 if (link_up) {
591 if (++link_up_count == 2)
592 return 0;
593 } else {
594 link_up_count = 0;
595 }
596 }
597
598 return -ETIMEDOUT;
599}
600
601static int efx_test_loopbacks(struct efx_nic *efx, struct efx_self_tests *tests,
602 unsigned int loopback_modes)
603{
604 enum efx_loopback_mode mode;
605 struct efx_loopback_state *state;
606 struct efx_channel *channel =
607 efx_get_channel(efx, efx->tx_channel_offset);
608 struct efx_tx_queue *tx_queue;
609 int rc = 0;
610
611 /* Set the port loopback_selftest member. From this point on
612 * all received packets will be dropped. Mark the state as
613 * "flushing" so all inflight packets are dropped */
614 state = kzalloc(sizeof(*state), GFP_KERNEL);
615 if (state == NULL)
616 return -ENOMEM;
617 BUG_ON(efx->loopback_selftest);
618 state->flush = true;
619 efx->loopback_selftest = state;
620
621 /* Test all supported loopback modes */
622 for (mode = LOOPBACK_NONE; mode <= LOOPBACK_TEST_MAX; mode++) {
623 if (!(loopback_modes & (1 << mode)))
624 continue;
625
626 /* Move the port into the specified loopback mode. */
627 state->flush = true;
628 mutex_lock(&efx->mac_lock);
629 efx->loopback_mode = mode;
630 rc = __efx_reconfigure_port(efx);
631 mutex_unlock(&efx->mac_lock);
632 if (rc) {
633 netif_err(efx, drv, efx->net_dev,
634 "unable to move into %s loopback\n",
635 LOOPBACK_MODE(efx));
636 goto out;
637 }
638
639 rc = efx_wait_for_link(efx);
640 if (rc) {
641 netif_err(efx, drv, efx->net_dev,
642 "loopback %s never came up\n",
643 LOOPBACK_MODE(efx));
644 goto out;
645 }
646
647 /* Test all enabled types of TX queue */
648 efx_for_each_channel_tx_queue(tx_queue, channel) {
649 state->offload_csum = (tx_queue->queue &
650 EFX_TXQ_TYPE_OFFLOAD);
651 rc = efx_test_loopback(tx_queue,
652 &tests->loopback[mode]);
653 if (rc)
654 goto out;
655 }
656 }
657
658 out:
659 /* Remove the flush. The caller will remove the loopback setting */
660 state->flush = true;
661 efx->loopback_selftest = NULL;
662 wmb();
663 kfree(state);
664
665 return rc;
666}
667
668/**************************************************************************
669 *
670 * Entry point
671 *
672 *************************************************************************/
673
674int efx_selftest(struct efx_nic *efx, struct efx_self_tests *tests,
675 unsigned flags)
676{
677 enum efx_loopback_mode loopback_mode = efx->loopback_mode;
678 int phy_mode = efx->phy_mode;
679 int rc_test = 0, rc_reset, rc;
680
681 efx_selftest_async_cancel(efx);
682
683 /* Online (i.e. non-disruptive) testing
684 * This checks interrupt generation, event delivery and PHY presence. */
685
686 rc = efx_test_phy_alive(efx, tests);
687 if (rc && !rc_test)
688 rc_test = rc;
689
690 rc = efx_test_nvram(efx, tests);
691 if (rc && !rc_test)
692 rc_test = rc;
693
694 rc = efx_test_interrupts(efx, tests);
695 if (rc && !rc_test)
696 rc_test = rc;
697
698 rc = efx_test_eventq_irq(efx, tests);
699 if (rc && !rc_test)
700 rc_test = rc;
701
702 if (rc_test)
703 return rc_test;
704
705 if (!(flags & ETH_TEST_FL_OFFLINE))
706 return efx_test_phy(efx, tests, flags);
707
708 /* Offline (i.e. disruptive) testing
709 * This checks MAC and PHY loopback on the specified port. */
710
711 /* Detach the device so the kernel doesn't transmit during the
712 * loopback test and the watchdog timeout doesn't fire.
713 */
714 efx_device_detach_sync(efx);
715
716 if (efx->type->test_chip) {
717 rc_reset = efx->type->test_chip(efx, tests);
718 if (rc_reset) {
719 netif_err(efx, hw, efx->net_dev,
720 "Unable to recover from chip test\n");
721 efx_schedule_reset(efx, RESET_TYPE_DISABLE);
722 return rc_reset;
723 }
724
725 if ((tests->memory < 0 || tests->registers < 0) && !rc_test)
726 rc_test = -EIO;
727 }
728
729 /* Ensure that the phy is powered and out of loopback
730 * for the bist and loopback tests */
731 mutex_lock(&efx->mac_lock);
732 efx->phy_mode &= ~PHY_MODE_LOW_POWER;
733 efx->loopback_mode = LOOPBACK_NONE;
734 __efx_reconfigure_port(efx);
735 mutex_unlock(&efx->mac_lock);
736
737 rc = efx_test_phy(efx, tests, flags);
738 if (rc && !rc_test)
739 rc_test = rc;
740
741 rc = efx_test_loopbacks(efx, tests, efx->loopback_modes);
742 if (rc && !rc_test)
743 rc_test = rc;
744
745 /* restore the PHY to the previous state */
746 mutex_lock(&efx->mac_lock);
747 efx->phy_mode = phy_mode;
748 efx->loopback_mode = loopback_mode;
749 __efx_reconfigure_port(efx);
750 mutex_unlock(&efx->mac_lock);
751
752 netif_device_attach(efx->net_dev);
753
754 return rc_test;
755}
756
757void efx_selftest_async_start(struct efx_nic *efx)
758{
759 struct efx_channel *channel;
760
761 efx_for_each_channel(channel, efx)
762 efx_nic_event_test_start(channel);
763 schedule_delayed_work(&efx->selftest_work, IRQ_TIMEOUT);
764}
765
766void efx_selftest_async_cancel(struct efx_nic *efx)
767{
768 cancel_delayed_work_sync(&efx->selftest_work);
769}
770
771void efx_selftest_async_work(struct work_struct *data)
772{
773 struct efx_nic *efx = container_of(data, struct efx_nic,
774 selftest_work.work);
775 struct efx_channel *channel;
776 int cpu;
777
778 efx_for_each_channel(channel, efx) {
779 cpu = efx_nic_event_test_irq_cpu(channel);
780 if (cpu < 0)
781 netif_err(efx, ifup, efx->net_dev,
782 "channel %d failed to trigger an interrupt\n",
783 channel->channel);
784 else
785 netif_dbg(efx, ifup, efx->net_dev,
786 "channel %d triggered interrupt on CPU %d\n",
787 channel->channel, cpu);
788 }
789}
1// SPDX-License-Identifier: GPL-2.0-only
2/****************************************************************************
3 * Driver for Solarflare network controllers and boards
4 * Copyright 2005-2006 Fen Systems Ltd.
5 * Copyright 2006-2012 Solarflare Communications Inc.
6 */
7
8#include <linux/netdevice.h>
9#include <linux/module.h>
10#include <linux/delay.h>
11#include <linux/kernel_stat.h>
12#include <linux/pci.h>
13#include <linux/ethtool.h>
14#include <linux/ip.h>
15#include <linux/in.h>
16#include <linux/udp.h>
17#include <linux/rtnetlink.h>
18#include <linux/slab.h>
19#include "net_driver.h"
20#include "efx.h"
21#include "efx_common.h"
22#include "efx_channels.h"
23#include "nic.h"
24#include "mcdi_port_common.h"
25#include "selftest.h"
26#include "workarounds.h"
27
28/* IRQ latency can be enormous because:
29 * - All IRQs may be disabled on a CPU for a *long* time by e.g. a
30 * slow serial console or an old IDE driver doing error recovery
31 * - The PREEMPT_RT patches mostly deal with this, but also allow a
32 * tasklet or normal task to be given higher priority than our IRQ
33 * threads
34 * Try to avoid blaming the hardware for this.
35 */
36#define IRQ_TIMEOUT HZ
37
38/*
39 * Loopback test packet structure
40 *
41 * The self-test should stress every RSS vector, and unfortunately
42 * Falcon only performs RSS on TCP/UDP packets.
43 */
44struct efx_loopback_payload {
45 struct ethhdr header;
46 struct iphdr ip;
47 struct udphdr udp;
48 __be16 iteration;
49 char msg[64];
50} __packed;
51
52/* Loopback test source MAC address */
53static const u8 payload_source[ETH_ALEN] __aligned(2) = {
54 0x00, 0x0f, 0x53, 0x1b, 0x1b, 0x1b,
55};
56
57static const char payload_msg[] =
58 "Hello world! This is an Efx loopback test in progress!";
59
60/* Interrupt mode names */
61static const unsigned int efx_interrupt_mode_max = EFX_INT_MODE_MAX;
62static const char *const efx_interrupt_mode_names[] = {
63 [EFX_INT_MODE_MSIX] = "MSI-X",
64 [EFX_INT_MODE_MSI] = "MSI",
65 [EFX_INT_MODE_LEGACY] = "legacy",
66};
67#define INT_MODE(efx) \
68 STRING_TABLE_LOOKUP(efx->interrupt_mode, efx_interrupt_mode)
69
70/**
71 * struct efx_loopback_state - persistent state during a loopback selftest
72 * @flush: Drop all packets in efx_loopback_rx_packet
73 * @packet_count: Number of packets being used in this test
74 * @skbs: An array of skbs transmitted
75 * @offload_csum: Checksums are being offloaded
76 * @rx_good: RX good packet count
77 * @rx_bad: RX bad packet count
78 * @payload: Payload used in tests
79 */
80struct efx_loopback_state {
81 bool flush;
82 int packet_count;
83 struct sk_buff **skbs;
84 bool offload_csum;
85 atomic_t rx_good;
86 atomic_t rx_bad;
87 struct efx_loopback_payload payload;
88};
89
90/* How long to wait for all the packets to arrive (in ms) */
91#define LOOPBACK_TIMEOUT_MS 1000
92
93/**************************************************************************
94 *
95 * MII, NVRAM and register tests
96 *
97 **************************************************************************/
98
99static int efx_test_phy_alive(struct efx_nic *efx, struct efx_self_tests *tests)
100{
101 int rc = 0;
102
103 rc = efx_mcdi_phy_test_alive(efx);
104 tests->phy_alive = rc ? -1 : 1;
105
106 return rc;
107}
108
109static int efx_test_nvram(struct efx_nic *efx, struct efx_self_tests *tests)
110{
111 int rc = 0;
112
113 if (efx->type->test_nvram) {
114 rc = efx->type->test_nvram(efx);
115 if (rc == -EPERM)
116 rc = 0;
117 else
118 tests->nvram = 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 */
131static int efx_test_interrupts(struct efx_nic *efx,
132 struct efx_self_tests *tests)
133{
134 unsigned long timeout, wait;
135 int cpu;
136 int rc;
137
138 netif_dbg(efx, drv, efx->net_dev, "testing interrupts\n");
139 tests->interrupt = -1;
140
141 rc = efx_nic_irq_test_start(efx);
142 if (rc == -ENOTSUPP) {
143 netif_dbg(efx, drv, efx->net_dev,
144 "direct interrupt testing not supported\n");
145 tests->interrupt = 0;
146 return 0;
147 }
148
149 timeout = jiffies + IRQ_TIMEOUT;
150 wait = 1;
151
152 /* Wait for arrival of test interrupt. */
153 netif_dbg(efx, drv, efx->net_dev, "waiting for test interrupt\n");
154 do {
155 schedule_timeout_uninterruptible(wait);
156 cpu = efx_nic_irq_test_irq_cpu(efx);
157 if (cpu >= 0)
158 goto success;
159 wait *= 2;
160 } while (time_before(jiffies, timeout));
161
162 netif_err(efx, drv, efx->net_dev, "timed out waiting for interrupt\n");
163 return -ETIMEDOUT;
164
165 success:
166 netif_dbg(efx, drv, efx->net_dev, "%s test interrupt seen on CPU%d\n",
167 INT_MODE(efx), cpu);
168 tests->interrupt = 1;
169 return 0;
170}
171
172/* Test generation and receipt of interrupting events */
173static int efx_test_eventq_irq(struct efx_nic *efx,
174 struct efx_self_tests *tests)
175{
176 struct efx_channel *channel;
177 unsigned int read_ptr[EFX_MAX_CHANNELS];
178 unsigned long napi_ran = 0, dma_pend = 0, int_pend = 0;
179 unsigned long timeout, wait;
180
181 BUILD_BUG_ON(EFX_MAX_CHANNELS > BITS_PER_LONG);
182
183 efx_for_each_channel(channel, efx) {
184 read_ptr[channel->channel] = channel->eventq_read_ptr;
185 set_bit(channel->channel, &dma_pend);
186 set_bit(channel->channel, &int_pend);
187 efx_nic_event_test_start(channel);
188 }
189
190 timeout = jiffies + IRQ_TIMEOUT;
191 wait = 1;
192
193 /* Wait for arrival of interrupts. NAPI processing may or may
194 * not complete in time, but we can cope in any case.
195 */
196 do {
197 schedule_timeout_uninterruptible(wait);
198
199 efx_for_each_channel(channel, efx) {
200 efx_stop_eventq(channel);
201 if (channel->eventq_read_ptr !=
202 read_ptr[channel->channel]) {
203 set_bit(channel->channel, &napi_ran);
204 clear_bit(channel->channel, &dma_pend);
205 clear_bit(channel->channel, &int_pend);
206 } else {
207 if (efx_nic_event_present(channel))
208 clear_bit(channel->channel, &dma_pend);
209 if (efx_nic_event_test_irq_cpu(channel) >= 0)
210 clear_bit(channel->channel, &int_pend);
211 }
212 efx_start_eventq(channel);
213 }
214
215 wait *= 2;
216 } while ((dma_pend || int_pend) && time_before(jiffies, timeout));
217
218 efx_for_each_channel(channel, efx) {
219 bool dma_seen = !test_bit(channel->channel, &dma_pend);
220 bool int_seen = !test_bit(channel->channel, &int_pend);
221
222 tests->eventq_dma[channel->channel] = dma_seen ? 1 : -1;
223 tests->eventq_int[channel->channel] = int_seen ? 1 : -1;
224
225 if (dma_seen && int_seen) {
226 netif_dbg(efx, drv, efx->net_dev,
227 "channel %d event queue passed (with%s NAPI)\n",
228 channel->channel,
229 test_bit(channel->channel, &napi_ran) ?
230 "" : "out");
231 } else {
232 /* Report failure and whether either interrupt or DMA
233 * worked
234 */
235 netif_err(efx, drv, efx->net_dev,
236 "channel %d timed out waiting for event queue\n",
237 channel->channel);
238 if (int_seen)
239 netif_err(efx, drv, efx->net_dev,
240 "channel %d saw interrupt "
241 "during event queue test\n",
242 channel->channel);
243 if (dma_seen)
244 netif_err(efx, drv, efx->net_dev,
245 "channel %d event was generated, but "
246 "failed to trigger an interrupt\n",
247 channel->channel);
248 }
249 }
250
251 return (dma_pend || int_pend) ? -ETIMEDOUT : 0;
252}
253
254static int efx_test_phy(struct efx_nic *efx, struct efx_self_tests *tests,
255 unsigned flags)
256{
257 int rc;
258
259 mutex_lock(&efx->mac_lock);
260 rc = efx_mcdi_phy_run_tests(efx, tests->phy_ext, flags);
261 mutex_unlock(&efx->mac_lock);
262 if (rc == -EPERM)
263 rc = 0;
264 else
265 netif_info(efx, drv, efx->net_dev,
266 "%s phy selftest\n", rc ? "Failed" : "Passed");
267
268 return rc;
269}
270
271/**************************************************************************
272 *
273 * Loopback testing
274 * NB Only one loopback test can be executing concurrently.
275 *
276 **************************************************************************/
277
278/* Loopback test RX callback
279 * This is called for each received packet during loopback testing.
280 */
281void efx_loopback_rx_packet(struct efx_nic *efx,
282 const char *buf_ptr, int pkt_len)
283{
284 struct efx_loopback_state *state = efx->loopback_selftest;
285 struct efx_loopback_payload *received;
286 struct efx_loopback_payload *payload;
287
288 BUG_ON(!buf_ptr);
289
290 /* If we are just flushing, then drop the packet */
291 if ((state == NULL) || state->flush)
292 return;
293
294 payload = &state->payload;
295
296 received = (struct efx_loopback_payload *) buf_ptr;
297 received->ip.saddr = payload->ip.saddr;
298 if (state->offload_csum)
299 received->ip.check = payload->ip.check;
300
301 /* Check that header exists */
302 if (pkt_len < sizeof(received->header)) {
303 netif_err(efx, drv, efx->net_dev,
304 "saw runt RX packet (length %d) in %s loopback "
305 "test\n", pkt_len, LOOPBACK_MODE(efx));
306 goto err;
307 }
308
309 /* Check that the ethernet header exists */
310 if (memcmp(&received->header, &payload->header, ETH_HLEN) != 0) {
311 netif_err(efx, drv, efx->net_dev,
312 "saw non-loopback RX packet in %s loopback test\n",
313 LOOPBACK_MODE(efx));
314 goto err;
315 }
316
317 /* Check packet length */
318 if (pkt_len != sizeof(*payload)) {
319 netif_err(efx, drv, efx->net_dev,
320 "saw incorrect RX packet length %d (wanted %d) in "
321 "%s loopback test\n", pkt_len, (int)sizeof(*payload),
322 LOOPBACK_MODE(efx));
323 goto err;
324 }
325
326 /* Check that IP header matches */
327 if (memcmp(&received->ip, &payload->ip, sizeof(payload->ip)) != 0) {
328 netif_err(efx, drv, efx->net_dev,
329 "saw corrupted IP header in %s loopback test\n",
330 LOOPBACK_MODE(efx));
331 goto err;
332 }
333
334 /* Check that msg and padding matches */
335 if (memcmp(&received->msg, &payload->msg, sizeof(received->msg)) != 0) {
336 netif_err(efx, drv, efx->net_dev,
337 "saw corrupted RX packet in %s loopback test\n",
338 LOOPBACK_MODE(efx));
339 goto err;
340 }
341
342 /* Check that iteration matches */
343 if (received->iteration != payload->iteration) {
344 netif_err(efx, drv, efx->net_dev,
345 "saw RX packet from iteration %d (wanted %d) in "
346 "%s loopback test\n", ntohs(received->iteration),
347 ntohs(payload->iteration), LOOPBACK_MODE(efx));
348 goto err;
349 }
350
351 /* Increase correct RX count */
352 netif_vdbg(efx, drv, efx->net_dev,
353 "got loopback RX in %s loopback test\n", LOOPBACK_MODE(efx));
354
355 atomic_inc(&state->rx_good);
356 return;
357
358 err:
359#ifdef DEBUG
360 if (atomic_read(&state->rx_bad) == 0) {
361 netif_err(efx, drv, efx->net_dev, "received packet:\n");
362 print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 0x10, 1,
363 buf_ptr, pkt_len, 0);
364 netif_err(efx, drv, efx->net_dev, "expected packet:\n");
365 print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 0x10, 1,
366 &state->payload, sizeof(state->payload), 0);
367 }
368#endif
369 atomic_inc(&state->rx_bad);
370}
371
372/* Initialise an efx_selftest_state for a new iteration */
373static void efx_iterate_state(struct efx_nic *efx)
374{
375 struct efx_loopback_state *state = efx->loopback_selftest;
376 struct net_device *net_dev = efx->net_dev;
377 struct efx_loopback_payload *payload = &state->payload;
378
379 /* Initialise the layerII header */
380 ether_addr_copy((u8 *)&payload->header.h_dest, net_dev->dev_addr);
381 ether_addr_copy((u8 *)&payload->header.h_source, payload_source);
382 payload->header.h_proto = htons(ETH_P_IP);
383
384 /* saddr set later and used as incrementing count */
385 payload->ip.daddr = htonl(INADDR_LOOPBACK);
386 payload->ip.ihl = 5;
387 payload->ip.check = (__force __sum16) htons(0xdead);
388 payload->ip.tot_len = htons(sizeof(*payload) - sizeof(struct ethhdr));
389 payload->ip.version = IPVERSION;
390 payload->ip.protocol = IPPROTO_UDP;
391
392 /* Initialise udp header */
393 payload->udp.source = 0;
394 payload->udp.len = htons(sizeof(*payload) - sizeof(struct ethhdr) -
395 sizeof(struct iphdr));
396 payload->udp.check = 0; /* checksum ignored */
397
398 /* Fill out payload */
399 payload->iteration = htons(ntohs(payload->iteration) + 1);
400 memcpy(&payload->msg, payload_msg, sizeof(payload_msg));
401
402 /* Fill out remaining state members */
403 atomic_set(&state->rx_good, 0);
404 atomic_set(&state->rx_bad, 0);
405 smp_wmb();
406}
407
408static int efx_begin_loopback(struct efx_tx_queue *tx_queue)
409{
410 struct efx_nic *efx = tx_queue->efx;
411 struct efx_loopback_state *state = efx->loopback_selftest;
412 struct efx_loopback_payload *payload;
413 struct sk_buff *skb;
414 int i;
415 netdev_tx_t rc;
416
417 /* Transmit N copies of buffer */
418 for (i = 0; i < state->packet_count; i++) {
419 /* Allocate an skb, holding an extra reference for
420 * transmit completion counting */
421 skb = alloc_skb(sizeof(state->payload), GFP_KERNEL);
422 if (!skb)
423 return -ENOMEM;
424 state->skbs[i] = skb;
425 skb_get(skb);
426
427 /* Copy the payload in, incrementing the source address to
428 * exercise the rss vectors */
429 payload = skb_put(skb, sizeof(state->payload));
430 memcpy(payload, &state->payload, sizeof(state->payload));
431 payload->ip.saddr = htonl(INADDR_LOOPBACK | (i << 2));
432
433 /* Ensure everything we've written is visible to the
434 * interrupt handler. */
435 smp_wmb();
436
437 netif_tx_lock_bh(efx->net_dev);
438 rc = efx_enqueue_skb(tx_queue, skb);
439 netif_tx_unlock_bh(efx->net_dev);
440
441 if (rc != NETDEV_TX_OK) {
442 netif_err(efx, drv, efx->net_dev,
443 "TX queue %d could not transmit packet %d of "
444 "%d in %s loopback test\n", tx_queue->label,
445 i + 1, state->packet_count,
446 LOOPBACK_MODE(efx));
447
448 /* Defer cleaning up the other skbs for the caller */
449 kfree_skb(skb);
450 return -EPIPE;
451 }
452 }
453
454 return 0;
455}
456
457static int efx_poll_loopback(struct efx_nic *efx)
458{
459 struct efx_loopback_state *state = efx->loopback_selftest;
460
461 return atomic_read(&state->rx_good) == state->packet_count;
462}
463
464static int efx_end_loopback(struct efx_tx_queue *tx_queue,
465 struct efx_loopback_self_tests *lb_tests)
466{
467 struct efx_nic *efx = tx_queue->efx;
468 struct efx_loopback_state *state = efx->loopback_selftest;
469 struct sk_buff *skb;
470 int tx_done = 0, rx_good, rx_bad;
471 int i, rc = 0;
472
473 netif_tx_lock_bh(efx->net_dev);
474
475 /* Count the number of tx completions, and decrement the refcnt. Any
476 * skbs not already completed will be free'd when the queue is flushed */
477 for (i = 0; i < state->packet_count; i++) {
478 skb = state->skbs[i];
479 if (skb && !skb_shared(skb))
480 ++tx_done;
481 dev_kfree_skb(skb);
482 }
483
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 netif_err(efx, drv, efx->net_dev,
494 "TX queue %d saw only %d out of an expected %d "
495 "TX completion events in %s loopback test\n",
496 tx_queue->label, tx_done, state->packet_count,
497 LOOPBACK_MODE(efx));
498 rc = -ETIMEDOUT;
499 /* Allow to fall through so we see the RX errors as well */
500 }
501
502 /* We may always be up to a flush away from our desired packet total */
503 if (rx_good != state->packet_count) {
504 netif_dbg(efx, drv, efx->net_dev,
505 "TX queue %d saw only %d out of an expected %d "
506 "received packets in %s loopback test\n",
507 tx_queue->label, rx_good, state->packet_count,
508 LOOPBACK_MODE(efx));
509 rc = -ETIMEDOUT;
510 /* Fall through */
511 }
512
513 /* Update loopback test structure */
514 lb_tests->tx_sent[tx_queue->label] += state->packet_count;
515 lb_tests->tx_done[tx_queue->label] += tx_done;
516 lb_tests->rx_good += rx_good;
517 lb_tests->rx_bad += rx_bad;
518
519 return rc;
520}
521
522static int
523efx_test_loopback(struct efx_tx_queue *tx_queue,
524 struct efx_loopback_self_tests *lb_tests)
525{
526 struct efx_nic *efx = tx_queue->efx;
527 struct efx_loopback_state *state = efx->loopback_selftest;
528 int i, begin_rc, end_rc;
529
530 for (i = 0; i < 3; i++) {
531 /* Determine how many packets to send */
532 state->packet_count = efx->txq_entries / 3;
533 state->packet_count = min(1 << (i << 2), state->packet_count);
534 state->skbs = kcalloc(state->packet_count,
535 sizeof(state->skbs[0]), GFP_KERNEL);
536 if (!state->skbs)
537 return -ENOMEM;
538 state->flush = false;
539
540 netif_dbg(efx, drv, efx->net_dev,
541 "TX queue %d (hw %d) testing %s loopback with %d packets\n",
542 tx_queue->label, tx_queue->queue, LOOPBACK_MODE(efx),
543 state->packet_count);
544
545 efx_iterate_state(efx);
546 begin_rc = efx_begin_loopback(tx_queue);
547
548 /* This will normally complete very quickly, but be
549 * prepared to wait much longer. */
550 msleep(1);
551 if (!efx_poll_loopback(efx)) {
552 msleep(LOOPBACK_TIMEOUT_MS);
553 efx_poll_loopback(efx);
554 }
555
556 end_rc = efx_end_loopback(tx_queue, lb_tests);
557 kfree(state->skbs);
558
559 if (begin_rc || end_rc) {
560 /* Wait a while to ensure there are no packets
561 * floating around after a failure. */
562 schedule_timeout_uninterruptible(HZ / 10);
563 return begin_rc ? begin_rc : end_rc;
564 }
565 }
566
567 netif_dbg(efx, drv, efx->net_dev,
568 "TX queue %d passed %s loopback test with a burst length "
569 "of %d packets\n", tx_queue->label, LOOPBACK_MODE(efx),
570 state->packet_count);
571
572 return 0;
573}
574
575/* Wait for link up. On Falcon, we would prefer to rely on efx_monitor, but
576 * any contention on the mac lock (via e.g. efx_mac_mcast_work) causes it
577 * to delay and retry. Therefore, it's safer to just poll directly. Wait
578 * for link up and any faults to dissipate. */
579static int efx_wait_for_link(struct efx_nic *efx)
580{
581 struct efx_link_state *link_state = &efx->link_state;
582 int count, link_up_count = 0;
583 bool link_up;
584
585 for (count = 0; count < 40; count++) {
586 schedule_timeout_uninterruptible(HZ / 10);
587
588 if (efx->type->monitor != NULL) {
589 mutex_lock(&efx->mac_lock);
590 efx->type->monitor(efx);
591 mutex_unlock(&efx->mac_lock);
592 }
593
594 mutex_lock(&efx->mac_lock);
595 link_up = link_state->up;
596 if (link_up)
597 link_up = !efx->type->check_mac_fault(efx);
598 mutex_unlock(&efx->mac_lock);
599
600 if (link_up) {
601 if (++link_up_count == 2)
602 return 0;
603 } else {
604 link_up_count = 0;
605 }
606 }
607
608 return -ETIMEDOUT;
609}
610
611static int efx_test_loopbacks(struct efx_nic *efx, struct efx_self_tests *tests,
612 unsigned int loopback_modes)
613{
614 enum efx_loopback_mode mode;
615 struct efx_loopback_state *state;
616 struct efx_channel *channel =
617 efx_get_channel(efx, efx->tx_channel_offset);
618 struct efx_tx_queue *tx_queue;
619 int rc = 0;
620
621 /* Set the port loopback_selftest member. From this point on
622 * all received packets will be dropped. Mark the state as
623 * "flushing" so all inflight packets are dropped */
624 state = kzalloc(sizeof(*state), GFP_KERNEL);
625 if (state == NULL)
626 return -ENOMEM;
627 BUG_ON(efx->loopback_selftest);
628 state->flush = true;
629 efx->loopback_selftest = state;
630
631 /* Test all supported loopback modes */
632 for (mode = LOOPBACK_NONE; mode <= LOOPBACK_TEST_MAX; mode++) {
633 if (!(loopback_modes & (1 << mode)))
634 continue;
635
636 /* Move the port into the specified loopback mode. */
637 state->flush = true;
638 mutex_lock(&efx->mac_lock);
639 efx->loopback_mode = mode;
640 rc = __efx_reconfigure_port(efx);
641 mutex_unlock(&efx->mac_lock);
642 if (rc) {
643 netif_err(efx, drv, efx->net_dev,
644 "unable to move into %s loopback\n",
645 LOOPBACK_MODE(efx));
646 goto out;
647 }
648
649 rc = efx_wait_for_link(efx);
650 if (rc) {
651 netif_err(efx, drv, efx->net_dev,
652 "loopback %s never came up\n",
653 LOOPBACK_MODE(efx));
654 goto out;
655 }
656
657 /* Test all enabled types of TX queue */
658 efx_for_each_channel_tx_queue(tx_queue, channel) {
659 state->offload_csum = (tx_queue->type &
660 EFX_TXQ_TYPE_OUTER_CSUM);
661 rc = efx_test_loopback(tx_queue,
662 &tests->loopback[mode]);
663 if (rc)
664 goto out;
665 }
666 }
667
668 out:
669 /* Remove the flush. The caller will remove the loopback setting */
670 state->flush = true;
671 efx->loopback_selftest = NULL;
672 wmb();
673 kfree(state);
674
675 if (rc == -EPERM)
676 rc = 0;
677
678 return rc;
679}
680
681/**************************************************************************
682 *
683 * Entry point
684 *
685 *************************************************************************/
686
687int efx_selftest(struct efx_nic *efx, struct efx_self_tests *tests,
688 unsigned flags)
689{
690 enum efx_loopback_mode loopback_mode = efx->loopback_mode;
691 int phy_mode = efx->phy_mode;
692 int rc_test = 0, rc_reset, rc;
693
694 efx_selftest_async_cancel(efx);
695
696 /* Online (i.e. non-disruptive) testing
697 * This checks interrupt generation, event delivery and PHY presence. */
698
699 rc = efx_test_phy_alive(efx, tests);
700 if (rc && !rc_test)
701 rc_test = rc;
702
703 rc = efx_test_nvram(efx, tests);
704 if (rc && !rc_test)
705 rc_test = rc;
706
707 rc = efx_test_interrupts(efx, tests);
708 if (rc && !rc_test)
709 rc_test = rc;
710
711 rc = efx_test_eventq_irq(efx, tests);
712 if (rc && !rc_test)
713 rc_test = rc;
714
715 if (rc_test)
716 return rc_test;
717
718 if (!(flags & ETH_TEST_FL_OFFLINE))
719 return efx_test_phy(efx, tests, flags);
720
721 /* Offline (i.e. disruptive) testing
722 * This checks MAC and PHY loopback on the specified port. */
723
724 /* Detach the device so the kernel doesn't transmit during the
725 * loopback test and the watchdog timeout doesn't fire.
726 */
727 efx_device_detach_sync(efx);
728
729 if (efx->type->test_chip) {
730 rc_reset = efx->type->test_chip(efx, tests);
731 if (rc_reset) {
732 netif_err(efx, hw, efx->net_dev,
733 "Unable to recover from chip test\n");
734 efx_schedule_reset(efx, RESET_TYPE_DISABLE);
735 return rc_reset;
736 }
737
738 if ((tests->memory < 0 || tests->registers < 0) && !rc_test)
739 rc_test = -EIO;
740 }
741
742 /* Ensure that the phy is powered and out of loopback
743 * for the bist and loopback tests */
744 mutex_lock(&efx->mac_lock);
745 efx->phy_mode &= ~PHY_MODE_LOW_POWER;
746 efx->loopback_mode = LOOPBACK_NONE;
747 __efx_reconfigure_port(efx);
748 mutex_unlock(&efx->mac_lock);
749
750 rc = efx_test_phy(efx, tests, flags);
751 if (rc && !rc_test)
752 rc_test = rc;
753
754 rc = efx_test_loopbacks(efx, tests, efx->loopback_modes);
755 if (rc && !rc_test)
756 rc_test = rc;
757
758 /* restore the PHY to the previous state */
759 mutex_lock(&efx->mac_lock);
760 efx->phy_mode = phy_mode;
761 efx->loopback_mode = loopback_mode;
762 __efx_reconfigure_port(efx);
763 mutex_unlock(&efx->mac_lock);
764
765 efx_device_attach_if_not_resetting(efx);
766
767 return rc_test;
768}
769
770void efx_selftest_async_start(struct efx_nic *efx)
771{
772 struct efx_channel *channel;
773
774 efx_for_each_channel(channel, efx)
775 efx_nic_event_test_start(channel);
776 schedule_delayed_work(&efx->selftest_work, IRQ_TIMEOUT);
777}
778
779void efx_selftest_async_cancel(struct efx_nic *efx)
780{
781 cancel_delayed_work_sync(&efx->selftest_work);
782}
783
784static void efx_selftest_async_work(struct work_struct *data)
785{
786 struct efx_nic *efx = container_of(data, struct efx_nic,
787 selftest_work.work);
788 struct efx_channel *channel;
789 int cpu;
790
791 efx_for_each_channel(channel, efx) {
792 cpu = efx_nic_event_test_irq_cpu(channel);
793 if (cpu < 0)
794 netif_err(efx, ifup, efx->net_dev,
795 "channel %d failed to trigger an interrupt\n",
796 channel->channel);
797 else
798 netif_dbg(efx, ifup, efx->net_dev,
799 "channel %d triggered interrupt on CPU %d\n",
800 channel->channel, cpu);
801 }
802}
803
804void efx_selftest_async_init(struct efx_nic *efx)
805{
806 INIT_DELAYED_WORK(&efx->selftest_work, efx_selftest_async_work);
807}