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 "selftest.h"
25 #include "workarounds.h"
26 
27 /* IRQ latency can be enormous because:
28  * - All IRQs may be disabled on a CPU for a *long* time by e.g. a
29  *   slow serial console or an old IDE driver doing error recovery
30  * - The PREEMPT_RT patches mostly deal with this, but also allow a
31  *   tasklet or normal task to be given higher priority than our IRQ
32  *   threads
33  * Try to avoid blaming the hardware for this.
34  */
35 #define IRQ_TIMEOUT HZ
36 
37 /*
38  * Loopback test packet structure
39  *
40  * The self-test should stress every RSS vector, and unfortunately
41  * Falcon only performs RSS on TCP/UDP packets.
42  */
43 struct efx_loopback_payload {
44 	struct ethhdr header;
45 	struct iphdr ip;
46 	struct udphdr udp;
47 	__be16 iteration;
48 	char msg[64];
49 } __packed;
50 
51 /* Loopback test source MAC address */
52 static const u8 payload_source[ETH_ALEN] __aligned(2) = {
53 	0x00, 0x0f, 0x53, 0x1b, 0x1b, 0x1b,
54 };
55 
56 static const char payload_msg[] =
57 	"Hello world! This is an Efx loopback test in progress!";
58 
59 /* Interrupt mode names */
60 static const unsigned int efx_interrupt_mode_max = EFX_INT_MODE_MAX;
61 static const char *const efx_interrupt_mode_names[] = {
62 	[EFX_INT_MODE_MSIX]   = "MSI-X",
63 	[EFX_INT_MODE_MSI]    = "MSI",
64 	[EFX_INT_MODE_LEGACY] = "legacy",
65 };
66 #define INT_MODE(efx) \
67 	STRING_TABLE_LOOKUP(efx->interrupt_mode, efx_interrupt_mode)
68 
69 /**
70  * efx_loopback_state - persistent state during a loopback selftest
71  * @flush:		Drop all packets in efx_loopback_rx_packet
72  * @packet_count:	Number of packets being used in this test
73  * @skbs:		An array of skbs transmitted
74  * @offload_csum:	Checksums are being offloaded
75  * @rx_good:		RX good packet count
76  * @rx_bad:		RX bad packet count
77  * @payload:		Payload used in tests
78  */
79 struct efx_loopback_state {
80 	bool flush;
81 	int packet_count;
82 	struct sk_buff **skbs;
83 	bool offload_csum;
84 	atomic_t rx_good;
85 	atomic_t rx_bad;
86 	struct efx_loopback_payload payload;
87 };
88 
89 /* How long to wait for all the packets to arrive (in ms) */
90 #define LOOPBACK_TIMEOUT_MS 1000
91 
92 /**************************************************************************
93  *
94  * MII, NVRAM and register tests
95  *
96  **************************************************************************/
97 
98 static int efx_test_phy_alive(struct efx_nic *efx, struct efx_self_tests *tests)
99 {
100 	int rc = 0;
101 
102 	if (efx->phy_op->test_alive) {
103 		rc = efx->phy_op->test_alive(efx);
104 		tests->phy_alive = rc ? -1 : 1;
105 	}
106 
107 	return rc;
108 }
109 
110 static int efx_test_nvram(struct efx_nic *efx, struct efx_self_tests *tests)
111 {
112 	int rc = 0;
113 
114 	if (efx->type->test_nvram) {
115 		rc = efx->type->test_nvram(efx);
116 		if (rc == -EPERM)
117 			rc = 0;
118 		else
119 			tests->nvram = rc ? -1 : 1;
120 	}
121 
122 	return rc;
123 }
124 
125 /**************************************************************************
126  *
127  * Interrupt and event queue testing
128  *
129  **************************************************************************/
130 
131 /* Test generation and receipt of interrupts */
132 static int efx_test_interrupts(struct efx_nic *efx,
133 			       struct efx_self_tests *tests)
134 {
135 	unsigned long timeout, wait;
136 	int cpu;
137 	int rc;
138 
139 	netif_dbg(efx, drv, efx->net_dev, "testing interrupts\n");
140 	tests->interrupt = -1;
141 
142 	rc = efx_nic_irq_test_start(efx);
143 	if (rc == -ENOTSUPP) {
144 		netif_dbg(efx, drv, efx->net_dev,
145 			  "direct interrupt testing not supported\n");
146 		tests->interrupt = 0;
147 		return 0;
148 	}
149 
150 	timeout = jiffies + IRQ_TIMEOUT;
151 	wait = 1;
152 
153 	/* Wait for arrival of test interrupt. */
154 	netif_dbg(efx, drv, efx->net_dev, "waiting for test interrupt\n");
155 	do {
156 		schedule_timeout_uninterruptible(wait);
157 		cpu = efx_nic_irq_test_irq_cpu(efx);
158 		if (cpu >= 0)
159 			goto success;
160 		wait *= 2;
161 	} while (time_before(jiffies, timeout));
162 
163 	netif_err(efx, drv, efx->net_dev, "timed out waiting for interrupt\n");
164 	return -ETIMEDOUT;
165 
166  success:
167 	netif_dbg(efx, drv, efx->net_dev, "%s test interrupt seen on CPU%d\n",
168 		  INT_MODE(efx), cpu);
169 	tests->interrupt = 1;
170 	return 0;
171 }
172 
173 /* Test generation and receipt of interrupting events */
174 static int efx_test_eventq_irq(struct efx_nic *efx,
175 			       struct efx_self_tests *tests)
176 {
177 	struct efx_channel *channel;
178 	unsigned int read_ptr[EFX_MAX_CHANNELS];
179 	unsigned long napi_ran = 0, dma_pend = 0, int_pend = 0;
180 	unsigned long timeout, wait;
181 
182 	BUILD_BUG_ON(EFX_MAX_CHANNELS > BITS_PER_LONG);
183 
184 	efx_for_each_channel(channel, efx) {
185 		read_ptr[channel->channel] = channel->eventq_read_ptr;
186 		set_bit(channel->channel, &dma_pend);
187 		set_bit(channel->channel, &int_pend);
188 		efx_nic_event_test_start(channel);
189 	}
190 
191 	timeout = jiffies + IRQ_TIMEOUT;
192 	wait = 1;
193 
194 	/* Wait for arrival of interrupts.  NAPI processing may or may
195 	 * not complete in time, but we can cope in any case.
196 	 */
197 	do {
198 		schedule_timeout_uninterruptible(wait);
199 
200 		efx_for_each_channel(channel, efx) {
201 			efx_stop_eventq(channel);
202 			if (channel->eventq_read_ptr !=
203 			    read_ptr[channel->channel]) {
204 				set_bit(channel->channel, &napi_ran);
205 				clear_bit(channel->channel, &dma_pend);
206 				clear_bit(channel->channel, &int_pend);
207 			} else {
208 				if (efx_nic_event_present(channel))
209 					clear_bit(channel->channel, &dma_pend);
210 				if (efx_nic_event_test_irq_cpu(channel) >= 0)
211 					clear_bit(channel->channel, &int_pend);
212 			}
213 			efx_start_eventq(channel);
214 		}
215 
216 		wait *= 2;
217 	} while ((dma_pend || int_pend) && time_before(jiffies, timeout));
218 
219 	efx_for_each_channel(channel, efx) {
220 		bool dma_seen = !test_bit(channel->channel, &dma_pend);
221 		bool int_seen = !test_bit(channel->channel, &int_pend);
222 
223 		tests->eventq_dma[channel->channel] = dma_seen ? 1 : -1;
224 		tests->eventq_int[channel->channel] = int_seen ? 1 : -1;
225 
226 		if (dma_seen && int_seen) {
227 			netif_dbg(efx, drv, efx->net_dev,
228 				  "channel %d event queue passed (with%s NAPI)\n",
229 				  channel->channel,
230 				  test_bit(channel->channel, &napi_ran) ?
231 				  "" : "out");
232 		} else {
233 			/* Report failure and whether either interrupt or DMA
234 			 * worked
235 			 */
236 			netif_err(efx, drv, efx->net_dev,
237 				  "channel %d timed out waiting for event queue\n",
238 				  channel->channel);
239 			if (int_seen)
240 				netif_err(efx, drv, efx->net_dev,
241 					  "channel %d saw interrupt "
242 					  "during event queue test\n",
243 					  channel->channel);
244 			if (dma_seen)
245 				netif_err(efx, drv, efx->net_dev,
246 					  "channel %d event was generated, but "
247 					  "failed to trigger an interrupt\n",
248 					  channel->channel);
249 		}
250 	}
251 
252 	return (dma_pend || int_pend) ? -ETIMEDOUT : 0;
253 }
254 
255 static int efx_test_phy(struct efx_nic *efx, struct efx_self_tests *tests,
256 			unsigned flags)
257 {
258 	int rc;
259 
260 	if (!efx->phy_op->run_tests)
261 		return 0;
262 
263 	mutex_lock(&efx->mac_lock);
264 	rc = efx->phy_op->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  */
285 void 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 	received = (struct efx_loopback_payload *) buf_ptr;
301 	received->ip.saddr = payload->ip.saddr;
302 	if (state->offload_csum)
303 		received->ip.check = payload->ip.check;
304 
305 	/* Check that header exists */
306 	if (pkt_len < sizeof(received->header)) {
307 		netif_err(efx, drv, efx->net_dev,
308 			  "saw runt RX packet (length %d) in %s loopback "
309 			  "test\n", pkt_len, LOOPBACK_MODE(efx));
310 		goto err;
311 	}
312 
313 	/* Check that the ethernet header exists */
314 	if (memcmp(&received->header, &payload->header, ETH_HLEN) != 0) {
315 		netif_err(efx, drv, efx->net_dev,
316 			  "saw non-loopback RX packet in %s loopback test\n",
317 			  LOOPBACK_MODE(efx));
318 		goto err;
319 	}
320 
321 	/* Check packet length */
322 	if (pkt_len != sizeof(*payload)) {
323 		netif_err(efx, drv, efx->net_dev,
324 			  "saw incorrect RX packet length %d (wanted %d) in "
325 			  "%s loopback test\n", pkt_len, (int)sizeof(*payload),
326 			  LOOPBACK_MODE(efx));
327 		goto err;
328 	}
329 
330 	/* Check that IP header matches */
331 	if (memcmp(&received->ip, &payload->ip, sizeof(payload->ip)) != 0) {
332 		netif_err(efx, drv, efx->net_dev,
333 			  "saw corrupted IP header in %s loopback test\n",
334 			  LOOPBACK_MODE(efx));
335 		goto err;
336 	}
337 
338 	/* Check that msg and padding matches */
339 	if (memcmp(&received->msg, &payload->msg, sizeof(received->msg)) != 0) {
340 		netif_err(efx, drv, efx->net_dev,
341 			  "saw corrupted RX packet in %s loopback test\n",
342 			  LOOPBACK_MODE(efx));
343 		goto err;
344 	}
345 
346 	/* Check that iteration matches */
347 	if (received->iteration != payload->iteration) {
348 		netif_err(efx, drv, efx->net_dev,
349 			  "saw RX packet from iteration %d (wanted %d) in "
350 			  "%s loopback test\n", ntohs(received->iteration),
351 			  ntohs(payload->iteration), LOOPBACK_MODE(efx));
352 		goto err;
353 	}
354 
355 	/* Increase correct RX count */
356 	netif_vdbg(efx, drv, efx->net_dev,
357 		   "got loopback RX in %s loopback test\n", LOOPBACK_MODE(efx));
358 
359 	atomic_inc(&state->rx_good);
360 	return;
361 
362  err:
363 #ifdef DEBUG
364 	if (atomic_read(&state->rx_bad) == 0) {
365 		netif_err(efx, drv, efx->net_dev, "received packet:\n");
366 		print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 0x10, 1,
367 			       buf_ptr, pkt_len, 0);
368 		netif_err(efx, drv, efx->net_dev, "expected packet:\n");
369 		print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 0x10, 1,
370 			       &state->payload, sizeof(state->payload), 0);
371 	}
372 #endif
373 	atomic_inc(&state->rx_bad);
374 }
375 
376 /* Initialise an efx_selftest_state for a new iteration */
377 static void efx_iterate_state(struct efx_nic *efx)
378 {
379 	struct efx_loopback_state *state = efx->loopback_selftest;
380 	struct net_device *net_dev = efx->net_dev;
381 	struct efx_loopback_payload *payload = &state->payload;
382 
383 	/* Initialise the layerII header */
384 	ether_addr_copy((u8 *)&payload->header.h_dest, net_dev->dev_addr);
385 	ether_addr_copy((u8 *)&payload->header.h_source, payload_source);
386 	payload->header.h_proto = htons(ETH_P_IP);
387 
388 	/* saddr set later and used as incrementing count */
389 	payload->ip.daddr = htonl(INADDR_LOOPBACK);
390 	payload->ip.ihl = 5;
391 	payload->ip.check = (__force __sum16) htons(0xdead);
392 	payload->ip.tot_len = htons(sizeof(*payload) - sizeof(struct ethhdr));
393 	payload->ip.version = IPVERSION;
394 	payload->ip.protocol = IPPROTO_UDP;
395 
396 	/* Initialise udp header */
397 	payload->udp.source = 0;
398 	payload->udp.len = htons(sizeof(*payload) - sizeof(struct ethhdr) -
399 				 sizeof(struct iphdr));
400 	payload->udp.check = 0;	/* checksum ignored */
401 
402 	/* Fill out payload */
403 	payload->iteration = htons(ntohs(payload->iteration) + 1);
404 	memcpy(&payload->msg, payload_msg, sizeof(payload_msg));
405 
406 	/* Fill out remaining state members */
407 	atomic_set(&state->rx_good, 0);
408 	atomic_set(&state->rx_bad, 0);
409 	smp_wmb();
410 }
411 
412 static int efx_begin_loopback(struct efx_tx_queue *tx_queue)
413 {
414 	struct efx_nic *efx = tx_queue->efx;
415 	struct efx_loopback_state *state = efx->loopback_selftest;
416 	struct efx_loopback_payload *payload;
417 	struct sk_buff *skb;
418 	int i;
419 	netdev_tx_t rc;
420 
421 	/* Transmit N copies of buffer */
422 	for (i = 0; i < state->packet_count; i++) {
423 		/* Allocate an skb, holding an extra reference for
424 		 * transmit completion counting */
425 		skb = alloc_skb(sizeof(state->payload), GFP_KERNEL);
426 		if (!skb)
427 			return -ENOMEM;
428 		state->skbs[i] = skb;
429 		skb_get(skb);
430 
431 		/* Copy the payload in, incrementing the source address to
432 		 * exercise the rss vectors */
433 		payload = skb_put(skb, sizeof(state->payload));
434 		memcpy(payload, &state->payload, sizeof(state->payload));
435 		payload->ip.saddr = htonl(INADDR_LOOPBACK | (i << 2));
436 
437 		/* Ensure everything we've written is visible to the
438 		 * interrupt handler. */
439 		smp_wmb();
440 
441 		netif_tx_lock_bh(efx->net_dev);
442 		rc = efx_enqueue_skb(tx_queue, skb);
443 		netif_tx_unlock_bh(efx->net_dev);
444 
445 		if (rc != NETDEV_TX_OK) {
446 			netif_err(efx, drv, efx->net_dev,
447 				  "TX queue %d could not transmit packet %d of "
448 				  "%d in %s loopback test\n", tx_queue->queue,
449 				  i + 1, state->packet_count,
450 				  LOOPBACK_MODE(efx));
451 
452 			/* Defer cleaning up the other skbs for the caller */
453 			kfree_skb(skb);
454 			return -EPIPE;
455 		}
456 	}
457 
458 	return 0;
459 }
460 
461 static int efx_poll_loopback(struct efx_nic *efx)
462 {
463 	struct efx_loopback_state *state = efx->loopback_selftest;
464 
465 	return atomic_read(&state->rx_good) == state->packet_count;
466 }
467 
468 static int efx_end_loopback(struct efx_tx_queue *tx_queue,
469 			    struct efx_loopback_self_tests *lb_tests)
470 {
471 	struct efx_nic *efx = tx_queue->efx;
472 	struct efx_loopback_state *state = efx->loopback_selftest;
473 	struct sk_buff *skb;
474 	int tx_done = 0, rx_good, rx_bad;
475 	int i, rc = 0;
476 
477 	netif_tx_lock_bh(efx->net_dev);
478 
479 	/* Count the number of tx completions, and decrement the refcnt. Any
480 	 * skbs not already completed will be free'd when the queue is flushed */
481 	for (i = 0; i < state->packet_count; i++) {
482 		skb = state->skbs[i];
483 		if (skb && !skb_shared(skb))
484 			++tx_done;
485 		dev_kfree_skb(skb);
486 	}
487 
488 	netif_tx_unlock_bh(efx->net_dev);
489 
490 	/* Check TX completion and received packet counts */
491 	rx_good = atomic_read(&state->rx_good);
492 	rx_bad = atomic_read(&state->rx_bad);
493 	if (tx_done != state->packet_count) {
494 		/* Don't free the skbs; they will be picked up on TX
495 		 * overflow or channel teardown.
496 		 */
497 		netif_err(efx, drv, efx->net_dev,
498 			  "TX queue %d saw only %d out of an expected %d "
499 			  "TX completion events in %s loopback test\n",
500 			  tx_queue->queue, tx_done, state->packet_count,
501 			  LOOPBACK_MODE(efx));
502 		rc = -ETIMEDOUT;
503 		/* Allow to fall through so we see the RX errors as well */
504 	}
505 
506 	/* We may always be up to a flush away from our desired packet total */
507 	if (rx_good != state->packet_count) {
508 		netif_dbg(efx, drv, efx->net_dev,
509 			  "TX queue %d saw only %d out of an expected %d "
510 			  "received packets in %s loopback test\n",
511 			  tx_queue->queue, rx_good, state->packet_count,
512 			  LOOPBACK_MODE(efx));
513 		rc = -ETIMEDOUT;
514 		/* Fall through */
515 	}
516 
517 	/* Update loopback test structure */
518 	lb_tests->tx_sent[tx_queue->queue] += state->packet_count;
519 	lb_tests->tx_done[tx_queue->queue] += tx_done;
520 	lb_tests->rx_good += rx_good;
521 	lb_tests->rx_bad += rx_bad;
522 
523 	return rc;
524 }
525 
526 static int
527 efx_test_loopback(struct efx_tx_queue *tx_queue,
528 		  struct efx_loopback_self_tests *lb_tests)
529 {
530 	struct efx_nic *efx = tx_queue->efx;
531 	struct efx_loopback_state *state = efx->loopback_selftest;
532 	int i, begin_rc, end_rc;
533 
534 	for (i = 0; i < 3; i++) {
535 		/* Determine how many packets to send */
536 		state->packet_count = efx->txq_entries / 3;
537 		state->packet_count = min(1 << (i << 2), state->packet_count);
538 		state->skbs = kcalloc(state->packet_count,
539 				      sizeof(state->skbs[0]), GFP_KERNEL);
540 		if (!state->skbs)
541 			return -ENOMEM;
542 		state->flush = false;
543 
544 		netif_dbg(efx, drv, efx->net_dev,
545 			  "TX queue %d testing %s loopback with %d packets\n",
546 			  tx_queue->queue, LOOPBACK_MODE(efx),
547 			  state->packet_count);
548 
549 		efx_iterate_state(efx);
550 		begin_rc = efx_begin_loopback(tx_queue);
551 
552 		/* This will normally complete very quickly, but be
553 		 * prepared to wait much longer. */
554 		msleep(1);
555 		if (!efx_poll_loopback(efx)) {
556 			msleep(LOOPBACK_TIMEOUT_MS);
557 			efx_poll_loopback(efx);
558 		}
559 
560 		end_rc = efx_end_loopback(tx_queue, lb_tests);
561 		kfree(state->skbs);
562 
563 		if (begin_rc || end_rc) {
564 			/* Wait a while to ensure there are no packets
565 			 * floating around after a failure. */
566 			schedule_timeout_uninterruptible(HZ / 10);
567 			return begin_rc ? begin_rc : end_rc;
568 		}
569 	}
570 
571 	netif_dbg(efx, drv, efx->net_dev,
572 		  "TX queue %d passed %s loopback test with a burst length "
573 		  "of %d packets\n", tx_queue->queue, LOOPBACK_MODE(efx),
574 		  state->packet_count);
575 
576 	return 0;
577 }
578 
579 /* Wait for link up. On Falcon, we would prefer to rely on efx_monitor, but
580  * any contention on the mac lock (via e.g. efx_mac_mcast_work) causes it
581  * to delay and retry. Therefore, it's safer to just poll directly. Wait
582  * for link up and any faults to dissipate. */
583 static int efx_wait_for_link(struct efx_nic *efx)
584 {
585 	struct efx_link_state *link_state = &efx->link_state;
586 	int count, link_up_count = 0;
587 	bool link_up;
588 
589 	for (count = 0; count < 40; count++) {
590 		schedule_timeout_uninterruptible(HZ / 10);
591 
592 		if (efx->type->monitor != NULL) {
593 			mutex_lock(&efx->mac_lock);
594 			efx->type->monitor(efx);
595 			mutex_unlock(&efx->mac_lock);
596 		}
597 
598 		mutex_lock(&efx->mac_lock);
599 		link_up = link_state->up;
600 		if (link_up)
601 			link_up = !efx->type->check_mac_fault(efx);
602 		mutex_unlock(&efx->mac_lock);
603 
604 		if (link_up) {
605 			if (++link_up_count == 2)
606 				return 0;
607 		} else {
608 			link_up_count = 0;
609 		}
610 	}
611 
612 	return -ETIMEDOUT;
613 }
614 
615 static int efx_test_loopbacks(struct efx_nic *efx, struct efx_self_tests *tests,
616 			      unsigned int loopback_modes)
617 {
618 	enum efx_loopback_mode mode;
619 	struct efx_loopback_state *state;
620 	struct efx_channel *channel =
621 		efx_get_channel(efx, efx->tx_channel_offset);
622 	struct efx_tx_queue *tx_queue;
623 	int rc = 0;
624 
625 	/* Set the port loopback_selftest member. From this point on
626 	 * all received packets will be dropped. Mark the state as
627 	 * "flushing" so all inflight packets are dropped */
628 	state = kzalloc(sizeof(*state), GFP_KERNEL);
629 	if (state == NULL)
630 		return -ENOMEM;
631 	BUG_ON(efx->loopback_selftest);
632 	state->flush = true;
633 	efx->loopback_selftest = state;
634 
635 	/* Test all supported loopback modes */
636 	for (mode = LOOPBACK_NONE; mode <= LOOPBACK_TEST_MAX; mode++) {
637 		if (!(loopback_modes & (1 << mode)))
638 			continue;
639 
640 		/* Move the port into the specified loopback mode. */
641 		state->flush = true;
642 		mutex_lock(&efx->mac_lock);
643 		efx->loopback_mode = mode;
644 		rc = __efx_reconfigure_port(efx);
645 		mutex_unlock(&efx->mac_lock);
646 		if (rc) {
647 			netif_err(efx, drv, efx->net_dev,
648 				  "unable to move into %s loopback\n",
649 				  LOOPBACK_MODE(efx));
650 			goto out;
651 		}
652 
653 		rc = efx_wait_for_link(efx);
654 		if (rc) {
655 			netif_err(efx, drv, efx->net_dev,
656 				  "loopback %s never came up\n",
657 				  LOOPBACK_MODE(efx));
658 			goto out;
659 		}
660 
661 		/* Test all enabled types of TX queue */
662 		efx_for_each_channel_tx_queue(tx_queue, channel) {
663 			state->offload_csum = (tx_queue->queue &
664 					       EFX_TXQ_TYPE_OFFLOAD);
665 			rc = efx_test_loopback(tx_queue,
666 					       &tests->loopback[mode]);
667 			if (rc)
668 				goto out;
669 		}
670 	}
671 
672  out:
673 	/* Remove the flush. The caller will remove the loopback setting */
674 	state->flush = true;
675 	efx->loopback_selftest = NULL;
676 	wmb();
677 	kfree(state);
678 
679 	if (rc == -EPERM)
680 		rc = 0;
681 
682 	return rc;
683 }
684 
685 /**************************************************************************
686  *
687  * Entry point
688  *
689  *************************************************************************/
690 
691 int efx_selftest(struct efx_nic *efx, struct efx_self_tests *tests,
692 		 unsigned flags)
693 {
694 	enum efx_loopback_mode loopback_mode = efx->loopback_mode;
695 	int phy_mode = efx->phy_mode;
696 	int rc_test = 0, rc_reset, rc;
697 
698 	efx_selftest_async_cancel(efx);
699 
700 	/* Online (i.e. non-disruptive) testing
701 	 * This checks interrupt generation, event delivery and PHY presence. */
702 
703 	rc = efx_test_phy_alive(efx, tests);
704 	if (rc && !rc_test)
705 		rc_test = rc;
706 
707 	rc = efx_test_nvram(efx, tests);
708 	if (rc && !rc_test)
709 		rc_test = rc;
710 
711 	rc = efx_test_interrupts(efx, tests);
712 	if (rc && !rc_test)
713 		rc_test = rc;
714 
715 	rc = efx_test_eventq_irq(efx, tests);
716 	if (rc && !rc_test)
717 		rc_test = rc;
718 
719 	if (rc_test)
720 		return rc_test;
721 
722 	if (!(flags & ETH_TEST_FL_OFFLINE))
723 		return efx_test_phy(efx, tests, flags);
724 
725 	/* Offline (i.e. disruptive) testing
726 	 * This checks MAC and PHY loopback on the specified port. */
727 
728 	/* Detach the device so the kernel doesn't transmit during the
729 	 * loopback test and the watchdog timeout doesn't fire.
730 	 */
731 	efx_device_detach_sync(efx);
732 
733 	if (efx->type->test_chip) {
734 		rc_reset = efx->type->test_chip(efx, tests);
735 		if (rc_reset) {
736 			netif_err(efx, hw, efx->net_dev,
737 				  "Unable to recover from chip test\n");
738 			efx_schedule_reset(efx, RESET_TYPE_DISABLE);
739 			return rc_reset;
740 		}
741 
742 		if ((tests->memory < 0 || tests->registers < 0) && !rc_test)
743 			rc_test = -EIO;
744 	}
745 
746 	/* Ensure that the phy is powered and out of loopback
747 	 * for the bist and loopback tests */
748 	mutex_lock(&efx->mac_lock);
749 	efx->phy_mode &= ~PHY_MODE_LOW_POWER;
750 	efx->loopback_mode = LOOPBACK_NONE;
751 	__efx_reconfigure_port(efx);
752 	mutex_unlock(&efx->mac_lock);
753 
754 	rc = efx_test_phy(efx, tests, flags);
755 	if (rc && !rc_test)
756 		rc_test = rc;
757 
758 	rc = efx_test_loopbacks(efx, tests, efx->loopback_modes);
759 	if (rc && !rc_test)
760 		rc_test = rc;
761 
762 	/* restore the PHY to the previous state */
763 	mutex_lock(&efx->mac_lock);
764 	efx->phy_mode = phy_mode;
765 	efx->loopback_mode = loopback_mode;
766 	__efx_reconfigure_port(efx);
767 	mutex_unlock(&efx->mac_lock);
768 
769 	efx_device_attach_if_not_resetting(efx);
770 
771 	return rc_test;
772 }
773 
774 void efx_selftest_async_start(struct efx_nic *efx)
775 {
776 	struct efx_channel *channel;
777 
778 	efx_for_each_channel(channel, efx)
779 		efx_nic_event_test_start(channel);
780 	schedule_delayed_work(&efx->selftest_work, IRQ_TIMEOUT);
781 }
782 
783 void efx_selftest_async_cancel(struct efx_nic *efx)
784 {
785 	cancel_delayed_work_sync(&efx->selftest_work);
786 }
787 
788 static void efx_selftest_async_work(struct work_struct *data)
789 {
790 	struct efx_nic *efx = container_of(data, struct efx_nic,
791 					   selftest_work.work);
792 	struct efx_channel *channel;
793 	int cpu;
794 
795 	efx_for_each_channel(channel, efx) {
796 		cpu = efx_nic_event_test_irq_cpu(channel);
797 		if (cpu < 0)
798 			netif_err(efx, ifup, efx->net_dev,
799 				  "channel %d failed to trigger an interrupt\n",
800 				  channel->channel);
801 		else
802 			netif_dbg(efx, ifup, efx->net_dev,
803 				  "channel %d triggered interrupt on CPU %d\n",
804 				  channel->channel, cpu);
805 	}
806 }
807 
808 void efx_selftest_async_init(struct efx_nic *efx)
809 {
810 	INIT_DELAYED_WORK(&efx->selftest_work, efx_selftest_async_work);
811 }
812