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/drivers/net/ethernet/sfc/selftest.c

http://github.com/mirrors/linux
C | 811 lines | 560 code | 127 blank | 124 comment | 95 complexity | 7eb9feaa9469a86d0fd9d290223b662e MD5 | raw file
  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 */
 43struct 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 */
 52static const u8 payload_source[ETH_ALEN] __aligned(2) = {
 53	0x00, 0x0f, 0x53, 0x1b, 0x1b, 0x1b,
 54};
 55
 56static const char payload_msg[] =
 57	"Hello world! This is an Efx loopback test in progress!";
 58
 59/* Interrupt mode names */
 60static const unsigned int efx_interrupt_mode_max = EFX_INT_MODE_MAX;
 61static 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 */
 79struct 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
 98static 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
110static 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 */
132static 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 */
174static 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
255static 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 */
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	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 */
377static 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
412static 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
461static 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
468static 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
526static int
527efx_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. */
583static 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
615static 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
691int 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
774void 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
783void efx_selftest_async_cancel(struct efx_nic *efx)
784{
785	cancel_delayed_work_sync(&efx->selftest_work);
786}
787
788static 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
808void efx_selftest_async_init(struct efx_nic *efx)
809{
810	INIT_DELAYED_WORK(&efx->selftest_work, efx_selftest_async_work);
811}