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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.
42 */
43struct efx_loopback_payload {
44 char pad[2]; /* Ensures ip is 4-byte aligned */
45 struct_group_attr(packet, __packed,
46 struct ethhdr header;
47 struct iphdr ip;
48 struct udphdr udp;
49 __be16 iteration;
50 char msg[64];
51 );
52} __packed __aligned(4);
53#define EFX_LOOPBACK_PAYLOAD_LEN \
54 sizeof_field(struct efx_loopback_payload, packet)
55
56/* Loopback test source MAC address */
57static const u8 payload_source[ETH_ALEN] __aligned(2) = {
58 0x00, 0x0f, 0x53, 0x1b, 0x1b, 0x1b,
59};
60
61static const char payload_msg[] =
62 "Hello world! This is an Efx loopback test in progress!";
63
64/* Interrupt mode names */
65static const unsigned int efx_interrupt_mode_max = EFX_INT_MODE_MAX;
66static const char *const efx_interrupt_mode_names[] = {
67 [EFX_INT_MODE_MSIX] = "MSI-X",
68 [EFX_INT_MODE_MSI] = "MSI",
69 [EFX_INT_MODE_LEGACY] = "legacy",
70};
71#define INT_MODE(efx) \
72 STRING_TABLE_LOOKUP(efx->interrupt_mode, efx_interrupt_mode)
73
74/**
75 * struct efx_loopback_state - persistent state during a loopback selftest
76 * @flush: Drop all packets in efx_loopback_rx_packet
77 * @packet_count: Number of packets being used in this test
78 * @skbs: An array of skbs transmitted
79 * @offload_csum: Checksums are being offloaded
80 * @rx_good: RX good packet count
81 * @rx_bad: RX bad packet count
82 * @payload: Payload used in tests
83 */
84struct efx_loopback_state {
85 bool flush;
86 int packet_count;
87 struct sk_buff **skbs;
88 bool offload_csum;
89 atomic_t rx_good;
90 atomic_t rx_bad;
91 struct efx_loopback_payload payload;
92};
93
94/* How long to wait for all the packets to arrive (in ms) */
95#define LOOPBACK_TIMEOUT_MS 1000
96
97/**************************************************************************
98 *
99 * MII, NVRAM and register tests
100 *
101 **************************************************************************/
102
103static int efx_test_phy_alive(struct efx_nic *efx, struct efx_self_tests *tests)
104{
105 int rc = 0;
106
107 rc = efx_mcdi_phy_test_alive(efx);
108 tests->phy_alive = rc ? -1 : 1;
109
110 return rc;
111}
112
113static int efx_test_nvram(struct efx_nic *efx, struct efx_self_tests *tests)
114{
115 int rc = 0;
116
117 if (efx->type->test_nvram) {
118 rc = efx->type->test_nvram(efx);
119 if (rc == -EPERM)
120 rc = 0;
121 else
122 tests->nvram = rc ? -1 : 1;
123 }
124
125 return rc;
126}
127
128/**************************************************************************
129 *
130 * Interrupt and event queue testing
131 *
132 **************************************************************************/
133
134/* Test generation and receipt of interrupts */
135static int efx_test_interrupts(struct efx_nic *efx,
136 struct efx_self_tests *tests)
137{
138 unsigned long timeout, wait;
139 int cpu;
140 int rc;
141
142 netif_dbg(efx, drv, efx->net_dev, "testing interrupts\n");
143 tests->interrupt = -1;
144
145 rc = efx_nic_irq_test_start(efx);
146 if (rc == -ENOTSUPP) {
147 netif_dbg(efx, drv, efx->net_dev,
148 "direct interrupt testing not supported\n");
149 tests->interrupt = 0;
150 return 0;
151 }
152
153 timeout = jiffies + IRQ_TIMEOUT;
154 wait = 1;
155
156 /* Wait for arrival of test interrupt. */
157 netif_dbg(efx, drv, efx->net_dev, "waiting for test interrupt\n");
158 do {
159 schedule_timeout_uninterruptible(wait);
160 cpu = efx_nic_irq_test_irq_cpu(efx);
161 if (cpu >= 0)
162 goto success;
163 wait *= 2;
164 } while (time_before(jiffies, timeout));
165
166 netif_err(efx, drv, efx->net_dev, "timed out waiting for interrupt\n");
167 return -ETIMEDOUT;
168
169 success:
170 netif_dbg(efx, drv, efx->net_dev, "%s test interrupt seen on CPU%d\n",
171 INT_MODE(efx), cpu);
172 tests->interrupt = 1;
173 return 0;
174}
175
176/* Test generation and receipt of interrupting events */
177static int efx_test_eventq_irq(struct efx_nic *efx,
178 struct efx_self_tests *tests)
179{
180 struct efx_channel *channel;
181 unsigned int read_ptr[EFX_MAX_CHANNELS];
182 unsigned long napi_ran = 0, dma_pend = 0, int_pend = 0;
183 unsigned long timeout, wait;
184
185 BUILD_BUG_ON(EFX_MAX_CHANNELS > BITS_PER_LONG);
186
187 efx_for_each_channel(channel, efx) {
188 read_ptr[channel->channel] = channel->eventq_read_ptr;
189 set_bit(channel->channel, &dma_pend);
190 set_bit(channel->channel, &int_pend);
191 efx_nic_event_test_start(channel);
192 }
193
194 timeout = jiffies + IRQ_TIMEOUT;
195 wait = 1;
196
197 /* Wait for arrival of interrupts. NAPI processing may or may
198 * not complete in time, but we can cope in any case.
199 */
200 do {
201 schedule_timeout_uninterruptible(wait);
202
203 efx_for_each_channel(channel, efx) {
204 efx_stop_eventq(channel);
205 if (channel->eventq_read_ptr !=
206 read_ptr[channel->channel]) {
207 set_bit(channel->channel, &napi_ran);
208 clear_bit(channel->channel, &dma_pend);
209 clear_bit(channel->channel, &int_pend);
210 } else {
211 if (efx_nic_event_present(channel))
212 clear_bit(channel->channel, &dma_pend);
213 if (efx_nic_event_test_irq_cpu(channel) >= 0)
214 clear_bit(channel->channel, &int_pend);
215 }
216 efx_start_eventq(channel);
217 }
218
219 wait *= 2;
220 } while ((dma_pend || int_pend) && time_before(jiffies, timeout));
221
222 efx_for_each_channel(channel, efx) {
223 bool dma_seen = !test_bit(channel->channel, &dma_pend);
224 bool int_seen = !test_bit(channel->channel, &int_pend);
225
226 tests->eventq_dma[channel->channel] = dma_seen ? 1 : -1;
227 tests->eventq_int[channel->channel] = int_seen ? 1 : -1;
228
229 if (dma_seen && int_seen) {
230 netif_dbg(efx, drv, efx->net_dev,
231 "channel %d event queue passed (with%s NAPI)\n",
232 channel->channel,
233 test_bit(channel->channel, &napi_ran) ?
234 "" : "out");
235 } else {
236 /* Report failure and whether either interrupt or DMA
237 * worked
238 */
239 netif_err(efx, drv, efx->net_dev,
240 "channel %d timed out waiting for event queue\n",
241 channel->channel);
242 if (int_seen)
243 netif_err(efx, drv, efx->net_dev,
244 "channel %d saw interrupt "
245 "during event queue test\n",
246 channel->channel);
247 if (dma_seen)
248 netif_err(efx, drv, efx->net_dev,
249 "channel %d event was generated, but "
250 "failed to trigger an interrupt\n",
251 channel->channel);
252 }
253 }
254
255 return (dma_pend || int_pend) ? -ETIMEDOUT : 0;
256}
257
258static int efx_test_phy(struct efx_nic *efx, struct efx_self_tests *tests,
259 unsigned flags)
260{
261 int rc;
262
263 mutex_lock(&efx->mac_lock);
264 rc = efx_mcdi_phy_run_tests(efx, tests->phy_ext, flags);
265 mutex_unlock(&efx->mac_lock);
266 if (rc == -EPERM)
267 rc = 0;
268 else
269 netif_info(efx, drv, efx->net_dev,
270 "%s phy selftest\n", rc ? "Failed" : "Passed");
271
272 return rc;
273}
274
275/**************************************************************************
276 *
277 * Loopback testing
278 * NB Only one loopback test can be executing concurrently.
279 *
280 **************************************************************************/
281
282/* Loopback test RX callback
283 * This is called for each received packet during loopback testing.
284 */
285void efx_loopback_rx_packet(struct efx_nic *efx,
286 const char *buf_ptr, int pkt_len)
287{
288 struct efx_loopback_state *state = efx->loopback_selftest;
289 struct efx_loopback_payload received;
290 struct efx_loopback_payload *payload;
291
292 BUG_ON(!buf_ptr);
293
294 /* If we are just flushing, then drop the packet */
295 if ((state == NULL) || state->flush)
296 return;
297
298 payload = &state->payload;
299
300 memcpy(&received.packet, buf_ptr,
301 min_t(int, pkt_len, EFX_LOOPBACK_PAYLOAD_LEN));
302 received.ip.saddr = payload->ip.saddr;
303 if (state->offload_csum)
304 received.ip.check = payload->ip.check;
305
306 /* Check that header exists */
307 if (pkt_len < sizeof(received.header)) {
308 netif_err(efx, drv, efx->net_dev,
309 "saw runt RX packet (length %d) in %s loopback "
310 "test\n", pkt_len, LOOPBACK_MODE(efx));
311 goto err;
312 }
313
314 /* Check that the ethernet header exists */
315 if (memcmp(&received.header, &payload->header, ETH_HLEN) != 0) {
316 netif_err(efx, drv, efx->net_dev,
317 "saw non-loopback RX packet in %s loopback test\n",
318 LOOPBACK_MODE(efx));
319 goto err;
320 }
321
322 /* Check packet length */
323 if (pkt_len != EFX_LOOPBACK_PAYLOAD_LEN) {
324 netif_err(efx, drv, efx->net_dev,
325 "saw incorrect RX packet length %d (wanted %d) in "
326 "%s loopback test\n", pkt_len,
327 (int)EFX_LOOPBACK_PAYLOAD_LEN, LOOPBACK_MODE(efx));
328 goto err;
329 }
330
331 /* Check that IP header matches */
332 if (memcmp(&received.ip, &payload->ip, sizeof(payload->ip)) != 0) {
333 netif_err(efx, drv, efx->net_dev,
334 "saw corrupted IP header in %s loopback test\n",
335 LOOPBACK_MODE(efx));
336 goto err;
337 }
338
339 /* Check that msg and padding matches */
340 if (memcmp(&received.msg, &payload->msg, sizeof(received.msg)) != 0) {
341 netif_err(efx, drv, efx->net_dev,
342 "saw corrupted RX packet in %s loopback test\n",
343 LOOPBACK_MODE(efx));
344 goto err;
345 }
346
347 /* Check that iteration matches */
348 if (received.iteration != payload->iteration) {
349 netif_err(efx, drv, efx->net_dev,
350 "saw RX packet from iteration %d (wanted %d) in "
351 "%s loopback test\n", ntohs(received.iteration),
352 ntohs(payload->iteration), LOOPBACK_MODE(efx));
353 goto err;
354 }
355
356 /* Increase correct RX count */
357 netif_vdbg(efx, drv, efx->net_dev,
358 "got loopback RX in %s loopback test\n", LOOPBACK_MODE(efx));
359
360 atomic_inc(&state->rx_good);
361 return;
362
363 err:
364#ifdef DEBUG
365 if (atomic_read(&state->rx_bad) == 0) {
366 netif_err(efx, drv, efx->net_dev, "received packet:\n");
367 print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 0x10, 1,
368 buf_ptr, pkt_len, 0);
369 netif_err(efx, drv, efx->net_dev, "expected packet:\n");
370 print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 0x10, 1,
371 &state->payload.packet, EFX_LOOPBACK_PAYLOAD_LEN,
372 0);
373 }
374#endif
375 atomic_inc(&state->rx_bad);
376}
377
378/* Initialise an efx_selftest_state for a new iteration */
379static void efx_iterate_state(struct efx_nic *efx)
380{
381 struct efx_loopback_state *state = efx->loopback_selftest;
382 struct net_device *net_dev = efx->net_dev;
383 struct efx_loopback_payload *payload = &state->payload;
384
385 /* Initialise the layerII header */
386 ether_addr_copy((u8 *)&payload->header.h_dest, net_dev->dev_addr);
387 ether_addr_copy((u8 *)&payload->header.h_source, payload_source);
388 payload->header.h_proto = htons(ETH_P_IP);
389
390 /* saddr set later and used as incrementing count */
391 payload->ip.daddr = htonl(INADDR_LOOPBACK);
392 payload->ip.ihl = 5;
393 payload->ip.check = (__force __sum16) htons(0xdead);
394 payload->ip.tot_len = htons(sizeof(*payload) -
395 offsetof(struct efx_loopback_payload, ip));
396 payload->ip.version = IPVERSION;
397 payload->ip.protocol = IPPROTO_UDP;
398
399 /* Initialise udp header */
400 payload->udp.source = 0;
401 payload->udp.len = htons(sizeof(*payload) -
402 offsetof(struct efx_loopback_payload, udp));
403 payload->udp.check = 0; /* checksum ignored */
404
405 /* Fill out payload */
406 payload->iteration = htons(ntohs(payload->iteration) + 1);
407 memcpy(&payload->msg, payload_msg, sizeof(payload_msg));
408
409 /* Fill out remaining state members */
410 atomic_set(&state->rx_good, 0);
411 atomic_set(&state->rx_bad, 0);
412 smp_wmb();
413}
414
415static int efx_begin_loopback(struct efx_tx_queue *tx_queue)
416{
417 struct efx_nic *efx = tx_queue->efx;
418 struct efx_loopback_state *state = efx->loopback_selftest;
419 struct efx_loopback_payload *payload;
420 struct sk_buff *skb;
421 int i;
422 netdev_tx_t rc;
423
424 /* Transmit N copies of buffer */
425 for (i = 0; i < state->packet_count; i++) {
426 /* Allocate an skb, holding an extra reference for
427 * transmit completion counting */
428 skb = alloc_skb(sizeof(state->payload), GFP_KERNEL);
429 if (!skb)
430 return -ENOMEM;
431 state->skbs[i] = skb;
432 skb_get(skb);
433
434 /* Copy the payload in, incrementing the source address to
435 * exercise the rss vectors */
436 payload = skb_put(skb, sizeof(state->payload));
437 memcpy(payload, &state->payload, sizeof(state->payload));
438 payload->ip.saddr = htonl(INADDR_LOOPBACK | (i << 2));
439 /* Strip off the leading padding */
440 skb_pull(skb, offsetof(struct efx_loopback_payload, header));
441 /* Strip off the trailing padding */
442 skb_trim(skb, EFX_LOOPBACK_PAYLOAD_LEN);
443
444 /* Ensure everything we've written is visible to the
445 * interrupt handler. */
446 smp_wmb();
447
448 netif_tx_lock_bh(efx->net_dev);
449 rc = efx_enqueue_skb(tx_queue, skb);
450 netif_tx_unlock_bh(efx->net_dev);
451
452 if (rc != NETDEV_TX_OK) {
453 netif_err(efx, drv, efx->net_dev,
454 "TX queue %d could not transmit packet %d of "
455 "%d in %s loopback test\n", tx_queue->label,
456 i + 1, state->packet_count,
457 LOOPBACK_MODE(efx));
458
459 /* Defer cleaning up the other skbs for the caller */
460 kfree_skb(skb);
461 return -EPIPE;
462 }
463 }
464
465 return 0;
466}
467
468static int efx_poll_loopback(struct efx_nic *efx)
469{
470 struct efx_loopback_state *state = efx->loopback_selftest;
471
472 return atomic_read(&state->rx_good) == state->packet_count;
473}
474
475static int efx_end_loopback(struct efx_tx_queue *tx_queue,
476 struct efx_loopback_self_tests *lb_tests)
477{
478 struct efx_nic *efx = tx_queue->efx;
479 struct efx_loopback_state *state = efx->loopback_selftest;
480 struct sk_buff *skb;
481 int tx_done = 0, rx_good, rx_bad;
482 int i, rc = 0;
483
484 netif_tx_lock_bh(efx->net_dev);
485
486 /* Count the number of tx completions, and decrement the refcnt. Any
487 * skbs not already completed will be free'd when the queue is flushed */
488 for (i = 0; i < state->packet_count; i++) {
489 skb = state->skbs[i];
490 if (skb && !skb_shared(skb))
491 ++tx_done;
492 dev_kfree_skb(skb);
493 }
494
495 netif_tx_unlock_bh(efx->net_dev);
496
497 /* Check TX completion and received packet counts */
498 rx_good = atomic_read(&state->rx_good);
499 rx_bad = atomic_read(&state->rx_bad);
500 if (tx_done != state->packet_count) {
501 /* Don't free the skbs; they will be picked up on TX
502 * overflow or channel teardown.
503 */
504 netif_err(efx, drv, efx->net_dev,
505 "TX queue %d saw only %d out of an expected %d "
506 "TX completion events in %s loopback test\n",
507 tx_queue->label, tx_done, state->packet_count,
508 LOOPBACK_MODE(efx));
509 rc = -ETIMEDOUT;
510 /* Allow to fall through so we see the RX errors as well */
511 }
512
513 /* We may always be up to a flush away from our desired packet total */
514 if (rx_good != state->packet_count) {
515 netif_dbg(efx, drv, efx->net_dev,
516 "TX queue %d saw only %d out of an expected %d "
517 "received packets in %s loopback test\n",
518 tx_queue->label, rx_good, state->packet_count,
519 LOOPBACK_MODE(efx));
520 rc = -ETIMEDOUT;
521 /* Fall through */
522 }
523
524 /* Update loopback test structure */
525 lb_tests->tx_sent[tx_queue->label] += state->packet_count;
526 lb_tests->tx_done[tx_queue->label] += tx_done;
527 lb_tests->rx_good += rx_good;
528 lb_tests->rx_bad += rx_bad;
529
530 return rc;
531}
532
533static int
534efx_test_loopback(struct efx_tx_queue *tx_queue,
535 struct efx_loopback_self_tests *lb_tests)
536{
537 struct efx_nic *efx = tx_queue->efx;
538 struct efx_loopback_state *state = efx->loopback_selftest;
539 int i, begin_rc, end_rc;
540
541 for (i = 0; i < 3; i++) {
542 /* Determine how many packets to send */
543 state->packet_count = efx->txq_entries / 3;
544 state->packet_count = min(1 << (i << 2), state->packet_count);
545 state->skbs = kcalloc(state->packet_count,
546 sizeof(state->skbs[0]), GFP_KERNEL);
547 if (!state->skbs)
548 return -ENOMEM;
549 state->flush = false;
550
551 netif_dbg(efx, drv, efx->net_dev,
552 "TX queue %d (hw %d) testing %s loopback with %d packets\n",
553 tx_queue->label, tx_queue->queue, LOOPBACK_MODE(efx),
554 state->packet_count);
555
556 efx_iterate_state(efx);
557 begin_rc = efx_begin_loopback(tx_queue);
558
559 /* This will normally complete very quickly, but be
560 * prepared to wait much longer. */
561 msleep(1);
562 if (!efx_poll_loopback(efx)) {
563 msleep(LOOPBACK_TIMEOUT_MS);
564 efx_poll_loopback(efx);
565 }
566
567 end_rc = efx_end_loopback(tx_queue, lb_tests);
568 kfree(state->skbs);
569
570 if (begin_rc || end_rc) {
571 /* Wait a while to ensure there are no packets
572 * floating around after a failure. */
573 schedule_timeout_uninterruptible(HZ / 10);
574 return begin_rc ? begin_rc : end_rc;
575 }
576 }
577
578 netif_dbg(efx, drv, efx->net_dev,
579 "TX queue %d passed %s loopback test with a burst length "
580 "of %d packets\n", tx_queue->label, LOOPBACK_MODE(efx),
581 state->packet_count);
582
583 return 0;
584}
585
586static int efx_wait_for_link(struct efx_nic *efx)
587{
588 struct efx_link_state *link_state = &efx->link_state;
589 int count, link_up_count = 0;
590 bool link_up;
591
592 for (count = 0; count < 40; count++) {
593 schedule_timeout_uninterruptible(HZ / 10);
594
595 if (efx->type->monitor != NULL) {
596 mutex_lock(&efx->mac_lock);
597 efx->type->monitor(efx);
598 mutex_unlock(&efx->mac_lock);
599 }
600
601 mutex_lock(&efx->mac_lock);
602 link_up = link_state->up;
603 if (link_up)
604 link_up = !efx->type->check_mac_fault(efx);
605 mutex_unlock(&efx->mac_lock);
606
607 if (link_up) {
608 if (++link_up_count == 2)
609 return 0;
610 } else {
611 link_up_count = 0;
612 }
613 }
614
615 return -ETIMEDOUT;
616}
617
618static int efx_test_loopbacks(struct efx_nic *efx, struct efx_self_tests *tests,
619 unsigned int loopback_modes)
620{
621 enum efx_loopback_mode mode;
622 struct efx_loopback_state *state;
623 struct efx_channel *channel =
624 efx_get_channel(efx, efx->tx_channel_offset);
625 struct efx_tx_queue *tx_queue;
626 int rc = 0;
627
628 /* Set the port loopback_selftest member. From this point on
629 * all received packets will be dropped. Mark the state as
630 * "flushing" so all inflight packets are dropped */
631 state = kzalloc(sizeof(*state), GFP_KERNEL);
632 if (state == NULL)
633 return -ENOMEM;
634 BUG_ON(efx->loopback_selftest);
635 state->flush = true;
636 efx->loopback_selftest = state;
637
638 /* Test all supported loopback modes */
639 for (mode = LOOPBACK_NONE; mode <= LOOPBACK_TEST_MAX; mode++) {
640 if (!(loopback_modes & (1 << mode)))
641 continue;
642
643 /* Move the port into the specified loopback mode. */
644 state->flush = true;
645 mutex_lock(&efx->mac_lock);
646 efx->loopback_mode = mode;
647 rc = __efx_reconfigure_port(efx);
648 mutex_unlock(&efx->mac_lock);
649 if (rc) {
650 netif_err(efx, drv, efx->net_dev,
651 "unable to move into %s loopback\n",
652 LOOPBACK_MODE(efx));
653 goto out;
654 }
655
656 rc = efx_wait_for_link(efx);
657 if (rc) {
658 netif_err(efx, drv, efx->net_dev,
659 "loopback %s never came up\n",
660 LOOPBACK_MODE(efx));
661 goto out;
662 }
663
664 /* Test all enabled types of TX queue */
665 efx_for_each_channel_tx_queue(tx_queue, channel) {
666 state->offload_csum = (tx_queue->type &
667 EFX_TXQ_TYPE_OUTER_CSUM);
668 rc = efx_test_loopback(tx_queue,
669 &tests->loopback[mode]);
670 if (rc)
671 goto out;
672 }
673 }
674
675 out:
676 /* Remove the flush. The caller will remove the loopback setting */
677 state->flush = true;
678 efx->loopback_selftest = NULL;
679 wmb();
680 kfree(state);
681
682 if (rc == -EPERM)
683 rc = 0;
684
685 return rc;
686}
687
688/**************************************************************************
689 *
690 * Entry point
691 *
692 *************************************************************************/
693
694int efx_selftest(struct efx_nic *efx, struct efx_self_tests *tests,
695 unsigned flags)
696{
697 enum efx_loopback_mode loopback_mode = efx->loopback_mode;
698 int phy_mode = efx->phy_mode;
699 int rc_test = 0, rc_reset, rc;
700
701 efx_selftest_async_cancel(efx);
702
703 /* Online (i.e. non-disruptive) testing
704 * This checks interrupt generation, event delivery and PHY presence. */
705
706 rc = efx_test_phy_alive(efx, tests);
707 if (rc && !rc_test)
708 rc_test = rc;
709
710 rc = efx_test_nvram(efx, tests);
711 if (rc && !rc_test)
712 rc_test = rc;
713
714 rc = efx_test_interrupts(efx, tests);
715 if (rc && !rc_test)
716 rc_test = rc;
717
718 rc = efx_test_eventq_irq(efx, tests);
719 if (rc && !rc_test)
720 rc_test = rc;
721
722 if (rc_test)
723 return rc_test;
724
725 if (!(flags & ETH_TEST_FL_OFFLINE))
726 return efx_test_phy(efx, tests, flags);
727
728 /* Offline (i.e. disruptive) testing
729 * This checks MAC and PHY loopback on the specified port. */
730
731 /* Detach the device so the kernel doesn't transmit during the
732 * loopback test and the watchdog timeout doesn't fire.
733 */
734 efx_device_detach_sync(efx);
735
736 if (efx->type->test_chip) {
737 rc_reset = efx->type->test_chip(efx, tests);
738 if (rc_reset) {
739 netif_err(efx, hw, efx->net_dev,
740 "Unable to recover from chip test\n");
741 efx_schedule_reset(efx, RESET_TYPE_DISABLE);
742 return rc_reset;
743 }
744
745 if ((tests->memory < 0 || tests->registers < 0) && !rc_test)
746 rc_test = -EIO;
747 }
748
749 /* Ensure that the phy is powered and out of loopback
750 * for the bist and loopback tests */
751 mutex_lock(&efx->mac_lock);
752 efx->phy_mode &= ~PHY_MODE_LOW_POWER;
753 efx->loopback_mode = LOOPBACK_NONE;
754 __efx_reconfigure_port(efx);
755 mutex_unlock(&efx->mac_lock);
756
757 rc = efx_test_phy(efx, tests, flags);
758 if (rc && !rc_test)
759 rc_test = rc;
760
761 rc = efx_test_loopbacks(efx, tests, efx->loopback_modes);
762 if (rc && !rc_test)
763 rc_test = rc;
764
765 /* restore the PHY to the previous state */
766 mutex_lock(&efx->mac_lock);
767 efx->phy_mode = phy_mode;
768 efx->loopback_mode = loopback_mode;
769 __efx_reconfigure_port(efx);
770 mutex_unlock(&efx->mac_lock);
771
772 efx_device_attach_if_not_resetting(efx);
773
774 return rc_test;
775}
776
777void efx_selftest_async_start(struct efx_nic *efx)
778{
779 struct efx_channel *channel;
780
781 efx_for_each_channel(channel, efx)
782 efx_nic_event_test_start(channel);
783 schedule_delayed_work(&efx->selftest_work, IRQ_TIMEOUT);
784}
785
786void efx_selftest_async_cancel(struct efx_nic *efx)
787{
788 cancel_delayed_work_sync(&efx->selftest_work);
789}
790
791static void efx_selftest_async_work(struct work_struct *data)
792{
793 struct efx_nic *efx = container_of(data, struct efx_nic,
794 selftest_work.work);
795 struct efx_channel *channel;
796 int cpu;
797
798 efx_for_each_channel(channel, efx) {
799 cpu = efx_nic_event_test_irq_cpu(channel);
800 if (cpu < 0)
801 netif_err(efx, ifup, efx->net_dev,
802 "channel %d failed to trigger an interrupt\n",
803 channel->channel);
804 else
805 netif_dbg(efx, ifup, efx->net_dev,
806 "channel %d triggered interrupt on CPU %d\n",
807 channel->channel, cpu);
808 }
809}
810
811void efx_selftest_async_init(struct efx_nic *efx)
812{
813 INIT_DELAYED_WORK(&efx->selftest_work, efx_selftest_async_work);
814}
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}