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  */
44 struct ef4_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 */
53 static const u8 payload_source[ETH_ALEN] __aligned(2) = {
54 	0x00, 0x0f, 0x53, 0x1b, 0x1b, 0x1b,
55 };
56 
57 static const char payload_msg[] =
58 	"Hello world! This is an Efx loopback test in progress!";
59 
60 /* Interrupt mode names */
61 static const unsigned int ef4_interrupt_mode_max = EF4_INT_MODE_MAX;
62 static const char *const ef4_interrupt_mode_names[] = {
63 	[EF4_INT_MODE_MSIX]   = "MSI-X",
64 	[EF4_INT_MODE_MSI]    = "MSI",
65 	[EF4_INT_MODE_LEGACY] = "legacy",
66 };
67 #define INT_MODE(efx) \
68 	STRING_TABLE_LOOKUP(efx->interrupt_mode, ef4_interrupt_mode)
69 
70 /**
71  * ef4_loopback_state - persistent state during a loopback selftest
72  * @flush:		Drop all packets in ef4_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  */
80 struct ef4_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 ef4_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 
99 static int ef4_test_phy_alive(struct ef4_nic *efx, struct ef4_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 
111 static int ef4_test_nvram(struct ef4_nic *efx, struct ef4_self_tests *tests)
112 {
113 	int rc = 0;
114 
115 	if (efx->type->test_nvram) {
116 		rc = efx->type->test_nvram(efx);
117 		if (rc == -EPERM)
118 			rc = 0;
119 		else
120 			tests->nvram = rc ? -1 : 1;
121 	}
122 
123 	return rc;
124 }
125 
126 /**************************************************************************
127  *
128  * Interrupt and event queue testing
129  *
130  **************************************************************************/
131 
132 /* Test generation and receipt of interrupts */
133 static int ef4_test_interrupts(struct ef4_nic *efx,
134 			       struct ef4_self_tests *tests)
135 {
136 	unsigned long timeout, wait;
137 	int cpu;
138 	int rc;
139 
140 	netif_dbg(efx, drv, efx->net_dev, "testing interrupts\n");
141 	tests->interrupt = -1;
142 
143 	rc = ef4_nic_irq_test_start(efx);
144 	if (rc == -ENOTSUPP) {
145 		netif_dbg(efx, drv, efx->net_dev,
146 			  "direct interrupt testing not supported\n");
147 		tests->interrupt = 0;
148 		return 0;
149 	}
150 
151 	timeout = jiffies + IRQ_TIMEOUT;
152 	wait = 1;
153 
154 	/* Wait for arrival of test interrupt. */
155 	netif_dbg(efx, drv, efx->net_dev, "waiting for test interrupt\n");
156 	do {
157 		schedule_timeout_uninterruptible(wait);
158 		cpu = ef4_nic_irq_test_irq_cpu(efx);
159 		if (cpu >= 0)
160 			goto success;
161 		wait *= 2;
162 	} while (time_before(jiffies, timeout));
163 
164 	netif_err(efx, drv, efx->net_dev, "timed out waiting for interrupt\n");
165 	return -ETIMEDOUT;
166 
167  success:
168 	netif_dbg(efx, drv, efx->net_dev, "%s test interrupt seen on CPU%d\n",
169 		  INT_MODE(efx), cpu);
170 	tests->interrupt = 1;
171 	return 0;
172 }
173 
174 /* Test generation and receipt of interrupting events */
175 static int ef4_test_eventq_irq(struct ef4_nic *efx,
176 			       struct ef4_self_tests *tests)
177 {
178 	struct ef4_channel *channel;
179 	unsigned int read_ptr[EF4_MAX_CHANNELS];
180 	unsigned long napi_ran = 0, dma_pend = 0, int_pend = 0;
181 	unsigned long timeout, wait;
182 
183 	BUILD_BUG_ON(EF4_MAX_CHANNELS > BITS_PER_LONG);
184 
185 	ef4_for_each_channel(channel, efx) {
186 		read_ptr[channel->channel] = channel->eventq_read_ptr;
187 		set_bit(channel->channel, &dma_pend);
188 		set_bit(channel->channel, &int_pend);
189 		ef4_nic_event_test_start(channel);
190 	}
191 
192 	timeout = jiffies + IRQ_TIMEOUT;
193 	wait = 1;
194 
195 	/* Wait for arrival of interrupts.  NAPI processing may or may
196 	 * not complete in time, but we can cope in any case.
197 	 */
198 	do {
199 		schedule_timeout_uninterruptible(wait);
200 
201 		ef4_for_each_channel(channel, efx) {
202 			ef4_stop_eventq(channel);
203 			if (channel->eventq_read_ptr !=
204 			    read_ptr[channel->channel]) {
205 				set_bit(channel->channel, &napi_ran);
206 				clear_bit(channel->channel, &dma_pend);
207 				clear_bit(channel->channel, &int_pend);
208 			} else {
209 				if (ef4_nic_event_present(channel))
210 					clear_bit(channel->channel, &dma_pend);
211 				if (ef4_nic_event_test_irq_cpu(channel) >= 0)
212 					clear_bit(channel->channel, &int_pend);
213 			}
214 			ef4_start_eventq(channel);
215 		}
216 
217 		wait *= 2;
218 	} while ((dma_pend || int_pend) && time_before(jiffies, timeout));
219 
220 	ef4_for_each_channel(channel, efx) {
221 		bool dma_seen = !test_bit(channel->channel, &dma_pend);
222 		bool int_seen = !test_bit(channel->channel, &int_pend);
223 
224 		tests->eventq_dma[channel->channel] = dma_seen ? 1 : -1;
225 		tests->eventq_int[channel->channel] = int_seen ? 1 : -1;
226 
227 		if (dma_seen && int_seen) {
228 			netif_dbg(efx, drv, efx->net_dev,
229 				  "channel %d event queue passed (with%s NAPI)\n",
230 				  channel->channel,
231 				  test_bit(channel->channel, &napi_ran) ?
232 				  "" : "out");
233 		} else {
234 			/* Report failure and whether either interrupt or DMA
235 			 * worked
236 			 */
237 			netif_err(efx, drv, efx->net_dev,
238 				  "channel %d timed out waiting for event queue\n",
239 				  channel->channel);
240 			if (int_seen)
241 				netif_err(efx, drv, efx->net_dev,
242 					  "channel %d saw interrupt "
243 					  "during event queue test\n",
244 					  channel->channel);
245 			if (dma_seen)
246 				netif_err(efx, drv, efx->net_dev,
247 					  "channel %d event was generated, but "
248 					  "failed to trigger an interrupt\n",
249 					  channel->channel);
250 		}
251 	}
252 
253 	return (dma_pend || int_pend) ? -ETIMEDOUT : 0;
254 }
255 
256 static int ef4_test_phy(struct ef4_nic *efx, struct ef4_self_tests *tests,
257 			unsigned flags)
258 {
259 	int rc;
260 
261 	if (!efx->phy_op->run_tests)
262 		return 0;
263 
264 	mutex_lock(&efx->mac_lock);
265 	rc = efx->phy_op->run_tests(efx, tests->phy_ext, flags);
266 	mutex_unlock(&efx->mac_lock);
267 	if (rc == -EPERM)
268 		rc = 0;
269 	else
270 		netif_info(efx, drv, efx->net_dev,
271 			   "%s phy selftest\n", rc ? "Failed" : "Passed");
272 
273 	return rc;
274 }
275 
276 /**************************************************************************
277  *
278  * Loopback testing
279  * NB Only one loopback test can be executing concurrently.
280  *
281  **************************************************************************/
282 
283 /* Loopback test RX callback
284  * This is called for each received packet during loopback testing.
285  */
286 void ef4_loopback_rx_packet(struct ef4_nic *efx,
287 			    const char *buf_ptr, int pkt_len)
288 {
289 	struct ef4_loopback_state *state = efx->loopback_selftest;
290 	struct ef4_loopback_payload *received;
291 	struct ef4_loopback_payload *payload;
292 
293 	BUG_ON(!buf_ptr);
294 
295 	/* If we are just flushing, then drop the packet */
296 	if ((state == NULL) || state->flush)
297 		return;
298 
299 	payload = &state->payload;
300 
301 	received = (struct ef4_loopback_payload *) buf_ptr;
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 != sizeof(*payload)) {
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, (int)sizeof(*payload),
327 			  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, sizeof(state->payload), 0);
372 	}
373 #endif
374 	atomic_inc(&state->rx_bad);
375 }
376 
377 /* Initialise an ef4_selftest_state for a new iteration */
378 static void ef4_iterate_state(struct ef4_nic *efx)
379 {
380 	struct ef4_loopback_state *state = efx->loopback_selftest;
381 	struct net_device *net_dev = efx->net_dev;
382 	struct ef4_loopback_payload *payload = &state->payload;
383 
384 	/* Initialise the layerII header */
385 	ether_addr_copy((u8 *)&payload->header.h_dest, net_dev->dev_addr);
386 	ether_addr_copy((u8 *)&payload->header.h_source, payload_source);
387 	payload->header.h_proto = htons(ETH_P_IP);
388 
389 	/* saddr set later and used as incrementing count */
390 	payload->ip.daddr = htonl(INADDR_LOOPBACK);
391 	payload->ip.ihl = 5;
392 	payload->ip.check = (__force __sum16) htons(0xdead);
393 	payload->ip.tot_len = htons(sizeof(*payload) - sizeof(struct ethhdr));
394 	payload->ip.version = IPVERSION;
395 	payload->ip.protocol = IPPROTO_UDP;
396 
397 	/* Initialise udp header */
398 	payload->udp.source = 0;
399 	payload->udp.len = htons(sizeof(*payload) - sizeof(struct ethhdr) -
400 				 sizeof(struct iphdr));
401 	payload->udp.check = 0;	/* checksum ignored */
402 
403 	/* Fill out payload */
404 	payload->iteration = htons(ntohs(payload->iteration) + 1);
405 	memcpy(&payload->msg, payload_msg, sizeof(payload_msg));
406 
407 	/* Fill out remaining state members */
408 	atomic_set(&state->rx_good, 0);
409 	atomic_set(&state->rx_bad, 0);
410 	smp_wmb();
411 }
412 
413 static int ef4_begin_loopback(struct ef4_tx_queue *tx_queue)
414 {
415 	struct ef4_nic *efx = tx_queue->efx;
416 	struct ef4_loopback_state *state = efx->loopback_selftest;
417 	struct ef4_loopback_payload *payload;
418 	struct sk_buff *skb;
419 	int i;
420 	netdev_tx_t rc;
421 
422 	/* Transmit N copies of buffer */
423 	for (i = 0; i < state->packet_count; i++) {
424 		/* Allocate an skb, holding an extra reference for
425 		 * transmit completion counting */
426 		skb = alloc_skb(sizeof(state->payload), GFP_KERNEL);
427 		if (!skb)
428 			return -ENOMEM;
429 		state->skbs[i] = skb;
430 		skb_get(skb);
431 
432 		/* Copy the payload in, incrementing the source address to
433 		 * exercise the rss vectors */
434 		payload = skb_put(skb, sizeof(state->payload));
435 		memcpy(payload, &state->payload, sizeof(state->payload));
436 		payload->ip.saddr = htonl(INADDR_LOOPBACK | (i << 2));
437 
438 		/* Ensure everything we've written is visible to the
439 		 * interrupt handler. */
440 		smp_wmb();
441 
442 		netif_tx_lock_bh(efx->net_dev);
443 		rc = ef4_enqueue_skb(tx_queue, skb);
444 		netif_tx_unlock_bh(efx->net_dev);
445 
446 		if (rc != NETDEV_TX_OK) {
447 			netif_err(efx, drv, efx->net_dev,
448 				  "TX queue %d could not transmit packet %d of "
449 				  "%d in %s loopback test\n", tx_queue->queue,
450 				  i + 1, state->packet_count,
451 				  LOOPBACK_MODE(efx));
452 
453 			/* Defer cleaning up the other skbs for the caller */
454 			kfree_skb(skb);
455 			return -EPIPE;
456 		}
457 	}
458 
459 	return 0;
460 }
461 
462 static int ef4_poll_loopback(struct ef4_nic *efx)
463 {
464 	struct ef4_loopback_state *state = efx->loopback_selftest;
465 
466 	return atomic_read(&state->rx_good) == state->packet_count;
467 }
468 
469 static int ef4_end_loopback(struct ef4_tx_queue *tx_queue,
470 			    struct ef4_loopback_self_tests *lb_tests)
471 {
472 	struct ef4_nic *efx = tx_queue->efx;
473 	struct ef4_loopback_state *state = efx->loopback_selftest;
474 	struct sk_buff *skb;
475 	int tx_done = 0, rx_good, rx_bad;
476 	int i, rc = 0;
477 
478 	netif_tx_lock_bh(efx->net_dev);
479 
480 	/* Count the number of tx completions, and decrement the refcnt. Any
481 	 * skbs not already completed will be free'd when the queue is flushed */
482 	for (i = 0; i < state->packet_count; i++) {
483 		skb = state->skbs[i];
484 		if (skb && !skb_shared(skb))
485 			++tx_done;
486 		dev_kfree_skb(skb);
487 	}
488 
489 	netif_tx_unlock_bh(efx->net_dev);
490 
491 	/* Check TX completion and received packet counts */
492 	rx_good = atomic_read(&state->rx_good);
493 	rx_bad = atomic_read(&state->rx_bad);
494 	if (tx_done != state->packet_count) {
495 		/* Don't free the skbs; they will be picked up on TX
496 		 * overflow or channel teardown.
497 		 */
498 		netif_err(efx, drv, efx->net_dev,
499 			  "TX queue %d saw only %d out of an expected %d "
500 			  "TX completion events in %s loopback test\n",
501 			  tx_queue->queue, tx_done, state->packet_count,
502 			  LOOPBACK_MODE(efx));
503 		rc = -ETIMEDOUT;
504 		/* Allow to fall through so we see the RX errors as well */
505 	}
506 
507 	/* We may always be up to a flush away from our desired packet total */
508 	if (rx_good != state->packet_count) {
509 		netif_dbg(efx, drv, efx->net_dev,
510 			  "TX queue %d saw only %d out of an expected %d "
511 			  "received packets in %s loopback test\n",
512 			  tx_queue->queue, rx_good, state->packet_count,
513 			  LOOPBACK_MODE(efx));
514 		rc = -ETIMEDOUT;
515 		/* Fall through */
516 	}
517 
518 	/* Update loopback test structure */
519 	lb_tests->tx_sent[tx_queue->queue] += state->packet_count;
520 	lb_tests->tx_done[tx_queue->queue] += tx_done;
521 	lb_tests->rx_good += rx_good;
522 	lb_tests->rx_bad += rx_bad;
523 
524 	return rc;
525 }
526 
527 static int
528 ef4_test_loopback(struct ef4_tx_queue *tx_queue,
529 		  struct ef4_loopback_self_tests *lb_tests)
530 {
531 	struct ef4_nic *efx = tx_queue->efx;
532 	struct ef4_loopback_state *state = efx->loopback_selftest;
533 	int i, begin_rc, end_rc;
534 
535 	for (i = 0; i < 3; i++) {
536 		/* Determine how many packets to send */
537 		state->packet_count = efx->txq_entries / 3;
538 		state->packet_count = min(1 << (i << 2), state->packet_count);
539 		state->skbs = kcalloc(state->packet_count,
540 				      sizeof(state->skbs[0]), GFP_KERNEL);
541 		if (!state->skbs)
542 			return -ENOMEM;
543 		state->flush = false;
544 
545 		netif_dbg(efx, drv, efx->net_dev,
546 			  "TX queue %d testing %s loopback with %d packets\n",
547 			  tx_queue->queue, LOOPBACK_MODE(efx),
548 			  state->packet_count);
549 
550 		ef4_iterate_state(efx);
551 		begin_rc = ef4_begin_loopback(tx_queue);
552 
553 		/* This will normally complete very quickly, but be
554 		 * prepared to wait much longer. */
555 		msleep(1);
556 		if (!ef4_poll_loopback(efx)) {
557 			msleep(LOOPBACK_TIMEOUT_MS);
558 			ef4_poll_loopback(efx);
559 		}
560 
561 		end_rc = ef4_end_loopback(tx_queue, lb_tests);
562 		kfree(state->skbs);
563 
564 		if (begin_rc || end_rc) {
565 			/* Wait a while to ensure there are no packets
566 			 * floating around after a failure. */
567 			schedule_timeout_uninterruptible(HZ / 10);
568 			return begin_rc ? begin_rc : end_rc;
569 		}
570 	}
571 
572 	netif_dbg(efx, drv, efx->net_dev,
573 		  "TX queue %d passed %s loopback test with a burst length "
574 		  "of %d packets\n", tx_queue->queue, LOOPBACK_MODE(efx),
575 		  state->packet_count);
576 
577 	return 0;
578 }
579 
580 /* Wait for link up. On Falcon, we would prefer to rely on ef4_monitor, but
581  * any contention on the mac lock (via e.g. ef4_mac_mcast_work) causes it
582  * to delay and retry. Therefore, it's safer to just poll directly. Wait
583  * for link up and any faults to dissipate. */
584 static int ef4_wait_for_link(struct ef4_nic *efx)
585 {
586 	struct ef4_link_state *link_state = &efx->link_state;
587 	int count, link_up_count = 0;
588 	bool link_up;
589 
590 	for (count = 0; count < 40; count++) {
591 		schedule_timeout_uninterruptible(HZ / 10);
592 
593 		if (efx->type->monitor != NULL) {
594 			mutex_lock(&efx->mac_lock);
595 			efx->type->monitor(efx);
596 			mutex_unlock(&efx->mac_lock);
597 		}
598 
599 		mutex_lock(&efx->mac_lock);
600 		link_up = link_state->up;
601 		if (link_up)
602 			link_up = !efx->type->check_mac_fault(efx);
603 		mutex_unlock(&efx->mac_lock);
604 
605 		if (link_up) {
606 			if (++link_up_count == 2)
607 				return 0;
608 		} else {
609 			link_up_count = 0;
610 		}
611 	}
612 
613 	return -ETIMEDOUT;
614 }
615 
616 static int ef4_test_loopbacks(struct ef4_nic *efx, struct ef4_self_tests *tests,
617 			      unsigned int loopback_modes)
618 {
619 	enum ef4_loopback_mode mode;
620 	struct ef4_loopback_state *state;
621 	struct ef4_channel *channel =
622 		ef4_get_channel(efx, efx->tx_channel_offset);
623 	struct ef4_tx_queue *tx_queue;
624 	int rc = 0;
625 
626 	/* Set the port loopback_selftest member. From this point on
627 	 * all received packets will be dropped. Mark the state as
628 	 * "flushing" so all inflight packets are dropped */
629 	state = kzalloc(sizeof(*state), GFP_KERNEL);
630 	if (state == NULL)
631 		return -ENOMEM;
632 	BUG_ON(efx->loopback_selftest);
633 	state->flush = true;
634 	efx->loopback_selftest = state;
635 
636 	/* Test all supported loopback modes */
637 	for (mode = LOOPBACK_NONE; mode <= LOOPBACK_TEST_MAX; mode++) {
638 		if (!(loopback_modes & (1 << mode)))
639 			continue;
640 
641 		/* Move the port into the specified loopback mode. */
642 		state->flush = true;
643 		mutex_lock(&efx->mac_lock);
644 		efx->loopback_mode = mode;
645 		rc = __ef4_reconfigure_port(efx);
646 		mutex_unlock(&efx->mac_lock);
647 		if (rc) {
648 			netif_err(efx, drv, efx->net_dev,
649 				  "unable to move into %s loopback\n",
650 				  LOOPBACK_MODE(efx));
651 			goto out;
652 		}
653 
654 		rc = ef4_wait_for_link(efx);
655 		if (rc) {
656 			netif_err(efx, drv, efx->net_dev,
657 				  "loopback %s never came up\n",
658 				  LOOPBACK_MODE(efx));
659 			goto out;
660 		}
661 
662 		/* Test all enabled types of TX queue */
663 		ef4_for_each_channel_tx_queue(tx_queue, channel) {
664 			state->offload_csum = (tx_queue->queue &
665 					       EF4_TXQ_TYPE_OFFLOAD);
666 			rc = ef4_test_loopback(tx_queue,
667 					       &tests->loopback[mode]);
668 			if (rc)
669 				goto out;
670 		}
671 	}
672 
673  out:
674 	/* Remove the flush. The caller will remove the loopback setting */
675 	state->flush = true;
676 	efx->loopback_selftest = NULL;
677 	wmb();
678 	kfree(state);
679 
680 	if (rc == -EPERM)
681 		rc = 0;
682 
683 	return rc;
684 }
685 
686 /**************************************************************************
687  *
688  * Entry point
689  *
690  *************************************************************************/
691 
692 int ef4_selftest(struct ef4_nic *efx, struct ef4_self_tests *tests,
693 		 unsigned flags)
694 {
695 	enum ef4_loopback_mode loopback_mode = efx->loopback_mode;
696 	int phy_mode = efx->phy_mode;
697 	int rc_test = 0, rc_reset, rc;
698 
699 	ef4_selftest_async_cancel(efx);
700 
701 	/* Online (i.e. non-disruptive) testing
702 	 * This checks interrupt generation, event delivery and PHY presence. */
703 
704 	rc = ef4_test_phy_alive(efx, tests);
705 	if (rc && !rc_test)
706 		rc_test = rc;
707 
708 	rc = ef4_test_nvram(efx, tests);
709 	if (rc && !rc_test)
710 		rc_test = rc;
711 
712 	rc = ef4_test_interrupts(efx, tests);
713 	if (rc && !rc_test)
714 		rc_test = rc;
715 
716 	rc = ef4_test_eventq_irq(efx, tests);
717 	if (rc && !rc_test)
718 		rc_test = rc;
719 
720 	if (rc_test)
721 		return rc_test;
722 
723 	if (!(flags & ETH_TEST_FL_OFFLINE))
724 		return ef4_test_phy(efx, tests, flags);
725 
726 	/* Offline (i.e. disruptive) testing
727 	 * This checks MAC and PHY loopback on the specified port. */
728 
729 	/* Detach the device so the kernel doesn't transmit during the
730 	 * loopback test and the watchdog timeout doesn't fire.
731 	 */
732 	ef4_device_detach_sync(efx);
733 
734 	if (efx->type->test_chip) {
735 		rc_reset = efx->type->test_chip(efx, tests);
736 		if (rc_reset) {
737 			netif_err(efx, hw, efx->net_dev,
738 				  "Unable to recover from chip test\n");
739 			ef4_schedule_reset(efx, RESET_TYPE_DISABLE);
740 			return rc_reset;
741 		}
742 
743 		if ((tests->memory < 0 || tests->registers < 0) && !rc_test)
744 			rc_test = -EIO;
745 	}
746 
747 	/* Ensure that the phy is powered and out of loopback
748 	 * for the bist and loopback tests */
749 	mutex_lock(&efx->mac_lock);
750 	efx->phy_mode &= ~PHY_MODE_LOW_POWER;
751 	efx->loopback_mode = LOOPBACK_NONE;
752 	__ef4_reconfigure_port(efx);
753 	mutex_unlock(&efx->mac_lock);
754 
755 	rc = ef4_test_phy(efx, tests, flags);
756 	if (rc && !rc_test)
757 		rc_test = rc;
758 
759 	rc = ef4_test_loopbacks(efx, tests, efx->loopback_modes);
760 	if (rc && !rc_test)
761 		rc_test = rc;
762 
763 	/* restore the PHY to the previous state */
764 	mutex_lock(&efx->mac_lock);
765 	efx->phy_mode = phy_mode;
766 	efx->loopback_mode = loopback_mode;
767 	__ef4_reconfigure_port(efx);
768 	mutex_unlock(&efx->mac_lock);
769 
770 	netif_device_attach(efx->net_dev);
771 
772 	return rc_test;
773 }
774 
775 void ef4_selftest_async_start(struct ef4_nic *efx)
776 {
777 	struct ef4_channel *channel;
778 
779 	ef4_for_each_channel(channel, efx)
780 		ef4_nic_event_test_start(channel);
781 	schedule_delayed_work(&efx->selftest_work, IRQ_TIMEOUT);
782 }
783 
784 void ef4_selftest_async_cancel(struct ef4_nic *efx)
785 {
786 	cancel_delayed_work_sync(&efx->selftest_work);
787 }
788 
789 void ef4_selftest_async_work(struct work_struct *data)
790 {
791 	struct ef4_nic *efx = container_of(data, struct ef4_nic,
792 					   selftest_work.work);
793 	struct ef4_channel *channel;
794 	int cpu;
795 
796 	ef4_for_each_channel(channel, efx) {
797 		cpu = ef4_nic_event_test_irq_cpu(channel);
798 		if (cpu < 0)
799 			netif_err(efx, ifup, efx->net_dev,
800 				  "channel %d failed to trigger an interrupt\n",
801 				  channel->channel);
802 		else
803 			netif_dbg(efx, ifup, efx->net_dev,
804 				  "channel %d triggered interrupt on CPU %d\n",
805 				  channel->channel, cpu);
806 	}
807 }
808