1 files changed, 807 insertions, 0 deletions

diff --git a/drivers/net/ethernet/sfc/selftest.c b/drivers/net/ethernet/sfc/selftest.c
new file mode 100644
index 000000000..3c5227afd
--- /dev/null
+++ b/drivers/net/ethernet/sfc/selftest.c
@@ -0,0 +1,807 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/****************************************************************************
+ * Driver for Solarflare network controllers and boards
+ * Copyright 2005-2006 Fen Systems Ltd.
+ * Copyright 2006-2012 Solarflare Communications Inc.
+ */
+
+#include <linux/netdevice.h>
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/kernel_stat.h>
+#include <linux/pci.h>
+#include <linux/ethtool.h>
+#include <linux/ip.h>
+#include <linux/in.h>
+#include <linux/udp.h>
+#include <linux/rtnetlink.h>
+#include <linux/slab.h>
+#include "net_driver.h"
+#include "efx.h"
+#include "efx_common.h"
+#include "efx_channels.h"
+#include "nic.h"
+#include "mcdi_port_common.h"
+#include "selftest.h"
+#include "workarounds.h"
+
+/* IRQ latency can be enormous because:
+ * - All IRQs may be disabled on a CPU for a *long* time by e.g. a
+ *   slow serial console or an old IDE driver doing error recovery
+ * - The PREEMPT_RT patches mostly deal with this, but also allow a
+ *   tasklet or normal task to be given higher priority than our IRQ
+ *   threads
+ * Try to avoid blaming the hardware for this.
+ */
+#define IRQ_TIMEOUT HZ
+
+/*
+ * Loopback test packet structure
+ *
+ * The self-test should stress every RSS vector, and unfortunately
+ * Falcon only performs RSS on TCP/UDP packets.
+ */
+struct efx_loopback_payload {
+	struct ethhdr header;
+	struct iphdr ip;
+	struct udphdr udp;
+	__be16 iteration;
+	char msg[64];
+} __packed;
+
+/* Loopback test source MAC address */
+static const u8 payload_source[ETH_ALEN] __aligned(2) = {
+	0x00, 0x0f, 0x53, 0x1b, 0x1b, 0x1b,
+};
+
+static const char payload_msg[] =
+	"Hello world! This is an Efx loopback test in progress!";
+
+/* Interrupt mode names */
+static const unsigned int efx_interrupt_mode_max = EFX_INT_MODE_MAX;
+static const char *const efx_interrupt_mode_names[] = {
+	[EFX_INT_MODE_MSIX]   = "MSI-X",
+	[EFX_INT_MODE_MSI]    = "MSI",
+	[EFX_INT_MODE_LEGACY] = "legacy",
+};
+#define INT_MODE(efx) \
+	STRING_TABLE_LOOKUP(efx->interrupt_mode, efx_interrupt_mode)
+
+/**
+ * struct efx_loopback_state - persistent state during a loopback selftest
+ * @flush:		Drop all packets in efx_loopback_rx_packet
+ * @packet_count:	Number of packets being used in this test
+ * @skbs:		An array of skbs transmitted
+ * @offload_csum:	Checksums are being offloaded
+ * @rx_good:		RX good packet count
+ * @rx_bad:		RX bad packet count
+ * @payload:		Payload used in tests
+ */
+struct efx_loopback_state {
+	bool flush;
+	int packet_count;
+	struct sk_buff **skbs;
+	bool offload_csum;
+	atomic_t rx_good;
+	atomic_t rx_bad;
+	struct efx_loopback_payload payload;
+};
+
+/* How long to wait for all the packets to arrive (in ms) */
+#define LOOPBACK_TIMEOUT_MS 1000
+
+/**************************************************************************
+ *
+ * MII, NVRAM and register tests
+ *
+ **************************************************************************/
+
+static int efx_test_phy_alive(struct efx_nic *efx, struct efx_self_tests *tests)
+{
+	int rc = 0;
+
+	rc = efx_mcdi_phy_test_alive(efx);
+	tests->phy_alive = rc ? -1 : 1;
+
+	return rc;
+}
+
+static int efx_test_nvram(struct efx_nic *efx, struct efx_self_tests *tests)
+{
+	int rc = 0;
+
+	if (efx->type->test_nvram) {
+		rc = efx->type->test_nvram(efx);
+		if (rc == -EPERM)
+			rc = 0;
+		else
+			tests->nvram = rc ? -1 : 1;
+	}
+
+	return rc;
+}
+
+/**************************************************************************
+ *
+ * Interrupt and event queue testing
+ *
+ **************************************************************************/
+
+/* Test generation and receipt of interrupts */
+static int efx_test_interrupts(struct efx_nic *efx,
+			       struct efx_self_tests *tests)
+{
+	unsigned long timeout, wait;
+	int cpu;
+	int rc;
+
+	netif_dbg(efx, drv, efx->net_dev, "testing interrupts\n");
+	tests->interrupt = -1;
+
+	rc = efx_nic_irq_test_start(efx);
+	if (rc == -ENOTSUPP) {
+		netif_dbg(efx, drv, efx->net_dev,
+			  "direct interrupt testing not supported\n");
+		tests->interrupt = 0;
+		return 0;
+	}
+
+	timeout = jiffies + IRQ_TIMEOUT;
+	wait = 1;
+
+	/* Wait for arrival of test interrupt. */
+	netif_dbg(efx, drv, efx->net_dev, "waiting for test interrupt\n");
+	do {
+		schedule_timeout_uninterruptible(wait);
+		cpu = efx_nic_irq_test_irq_cpu(efx);
+		if (cpu >= 0)
+			goto success;
+		wait *= 2;
+	} while (time_before(jiffies, timeout));
+
+	netif_err(efx, drv, efx->net_dev, "timed out waiting for interrupt\n");
+	return -ETIMEDOUT;
+
+ success:
+	netif_dbg(efx, drv, efx->net_dev, "%s test interrupt seen on CPU%d\n",
+		  INT_MODE(efx), cpu);
+	tests->interrupt = 1;
+	return 0;
+}
+
+/* Test generation and receipt of interrupting events */
+static int efx_test_eventq_irq(struct efx_nic *efx,
+			       struct efx_self_tests *tests)
+{
+	struct efx_channel *channel;
+	unsigned int read_ptr[EFX_MAX_CHANNELS];
+	unsigned long napi_ran = 0, dma_pend = 0, int_pend = 0;
+	unsigned long timeout, wait;
+
+	BUILD_BUG_ON(EFX_MAX_CHANNELS > BITS_PER_LONG);
+
+	efx_for_each_channel(channel, efx) {
+		read_ptr[channel->channel] = channel->eventq_read_ptr;
+		set_bit(channel->channel, &dma_pend);
+		set_bit(channel->channel, &int_pend);
+		efx_nic_event_test_start(channel);
+	}
+
+	timeout = jiffies + IRQ_TIMEOUT;
+	wait = 1;
+
+	/* Wait for arrival of interrupts.  NAPI processing may or may
+	 * not complete in time, but we can cope in any case.
+	 */
+	do {
+		schedule_timeout_uninterruptible(wait);
+
+		efx_for_each_channel(channel, efx) {
+			efx_stop_eventq(channel);
+			if (channel->eventq_read_ptr !=
+			    read_ptr[channel->channel]) {
+				set_bit(channel->channel, &napi_ran);
+				clear_bit(channel->channel, &dma_pend);
+				clear_bit(channel->channel, &int_pend);
+			} else {
+				if (efx_nic_event_present(channel))
+					clear_bit(channel->channel, &dma_pend);
+				if (efx_nic_event_test_irq_cpu(channel) >= 0)
+					clear_bit(channel->channel, &int_pend);
+			}
+			efx_start_eventq(channel);
+		}
+
+		wait *= 2;
+	} while ((dma_pend || int_pend) && time_before(jiffies, timeout));
+
+	efx_for_each_channel(channel, efx) {
+		bool dma_seen = !test_bit(channel->channel, &dma_pend);
+		bool int_seen = !test_bit(channel->channel, &int_pend);
+
+		tests->eventq_dma[channel->channel] = dma_seen ? 1 : -1;
+		tests->eventq_int[channel->channel] = int_seen ? 1 : -1;
+
+		if (dma_seen && int_seen) {
+			netif_dbg(efx, drv, efx->net_dev,
+				  "channel %d event queue passed (with%s NAPI)\n",
+				  channel->channel,
+				  test_bit(channel->channel, &napi_ran) ?
+				  "" : "out");
+		} else {
+			/* Report failure and whether either interrupt or DMA
+			 * worked
+			 */
+			netif_err(efx, drv, efx->net_dev,
+				  "channel %d timed out waiting for event queue\n",
+				  channel->channel);
+			if (int_seen)
+				netif_err(efx, drv, efx->net_dev,
+					  "channel %d saw interrupt "
+					  "during event queue test\n",
+					  channel->channel);
+			if (dma_seen)
+				netif_err(efx, drv, efx->net_dev,
+					  "channel %d event was generated, but "
+					  "failed to trigger an interrupt\n",
+					  channel->channel);
+		}
+	}
+
+	return (dma_pend || int_pend) ? -ETIMEDOUT : 0;
+}
+
+static int efx_test_phy(struct efx_nic *efx, struct efx_self_tests *tests,
+			unsigned flags)
+{
+	int rc;
+
+	mutex_lock(&efx->mac_lock);
+	rc = efx_mcdi_phy_run_tests(efx, tests->phy_ext, flags);
+	mutex_unlock(&efx->mac_lock);
+	if (rc == -EPERM)
+		rc = 0;
+	else
+		netif_info(efx, drv, efx->net_dev,
+			   "%s phy selftest\n", rc ? "Failed" : "Passed");
+
+	return rc;
+}
+
+/**************************************************************************
+ *
+ * Loopback testing
+ * NB Only one loopback test can be executing concurrently.
+ *
+ **************************************************************************/
+
+/* Loopback test RX callback
+ * This is called for each received packet during loopback testing.
+ */
+void efx_loopback_rx_packet(struct efx_nic *efx,
+			    const char *buf_ptr, int pkt_len)
+{
+	struct efx_loopback_state *state = efx->loopback_selftest;
+	struct efx_loopback_payload *received;
+	struct efx_loopback_payload *payload;
+
+	BUG_ON(!buf_ptr);
+
+	/* If we are just flushing, then drop the packet */
+	if ((state == NULL) || state->flush)
+		return;
+
+	payload = &state->payload;
+
+	received = (struct efx_loopback_payload *) buf_ptr;
+	received->ip.saddr = payload->ip.saddr;
+	if (state->offload_csum)
+		received->ip.check = payload->ip.check;
+
+	/* Check that header exists */
+	if (pkt_len < sizeof(received->header)) {
+		netif_err(efx, drv, efx->net_dev,
+			  "saw runt RX packet (length %d) in %s loopback "
+			  "test\n", pkt_len, LOOPBACK_MODE(efx));
+		goto err;
+	}
+
+	/* Check that the ethernet header exists */
+	if (memcmp(&received->header, &payload->header, ETH_HLEN) != 0) {
+		netif_err(efx, drv, efx->net_dev,
+			  "saw non-loopback RX packet in %s loopback test\n",
+			  LOOPBACK_MODE(efx));
+		goto err;
+	}
+
+	/* Check packet length */
+	if (pkt_len != sizeof(*payload)) {
+		netif_err(efx, drv, efx->net_dev,
+			  "saw incorrect RX packet length %d (wanted %d) in "
+			  "%s loopback test\n", pkt_len, (int)sizeof(*payload),
+			  LOOPBACK_MODE(efx));
+		goto err;
+	}
+
+	/* Check that IP header matches */
+	if (memcmp(&received->ip, &payload->ip, sizeof(payload->ip)) != 0) {
+		netif_err(efx, drv, efx->net_dev,
+			  "saw corrupted IP header in %s loopback test\n",
+			  LOOPBACK_MODE(efx));
+		goto err;
+	}
+
+	/* Check that msg and padding matches */
+	if (memcmp(&received->msg, &payload->msg, sizeof(received->msg)) != 0) {
+		netif_err(efx, drv, efx->net_dev,
+			  "saw corrupted RX packet in %s loopback test\n",
+			  LOOPBACK_MODE(efx));
+		goto err;
+	}
+
+	/* Check that iteration matches */
+	if (received->iteration != payload->iteration) {
+		netif_err(efx, drv, efx->net_dev,
+			  "saw RX packet from iteration %d (wanted %d) in "
+			  "%s loopback test\n", ntohs(received->iteration),
+			  ntohs(payload->iteration), LOOPBACK_MODE(efx));
+		goto err;
+	}
+
+	/* Increase correct RX count */
+	netif_vdbg(efx, drv, efx->net_dev,
+		   "got loopback RX in %s loopback test\n", LOOPBACK_MODE(efx));
+
+	atomic_inc(&state->rx_good);
+	return;
+
+ err:
+#ifdef DEBUG
+	if (atomic_read(&state->rx_bad) == 0) {
+		netif_err(efx, drv, efx->net_dev, "received packet:\n");
+		print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 0x10, 1,
+			       buf_ptr, pkt_len, 0);
+		netif_err(efx, drv, efx->net_dev, "expected packet:\n");
+		print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 0x10, 1,
+			       &state->payload, sizeof(state->payload), 0);
+	}
+#endif
+	atomic_inc(&state->rx_bad);
+}
+
+/* Initialise an efx_selftest_state for a new iteration */
+static void efx_iterate_state(struct efx_nic *efx)
+{
+	struct efx_loopback_state *state = efx->loopback_selftest;
+	struct net_device *net_dev = efx->net_dev;
+	struct efx_loopback_payload *payload = &state->payload;
+
+	/* Initialise the layerII header */
+	ether_addr_copy((u8 *)&payload->header.h_dest, net_dev->dev_addr);
+	ether_addr_copy((u8 *)&payload->header.h_source, payload_source);
+	payload->header.h_proto = htons(ETH_P_IP);
+
+	/* saddr set later and used as incrementing count */
+	payload->ip.daddr = htonl(INADDR_LOOPBACK);
+	payload->ip.ihl = 5;
+	payload->ip.check = (__force __sum16) htons(0xdead);
+	payload->ip.tot_len = htons(sizeof(*payload) - sizeof(struct ethhdr));
+	payload->ip.version = IPVERSION;
+	payload->ip.protocol = IPPROTO_UDP;
+
+	/* Initialise udp header */
+	payload->udp.source = 0;
+	payload->udp.len = htons(sizeof(*payload) - sizeof(struct ethhdr) -
+				 sizeof(struct iphdr));
+	payload->udp.check = 0;	/* checksum ignored */
+
+	/* Fill out payload */
+	payload->iteration = htons(ntohs(payload->iteration) + 1);
+	memcpy(&payload->msg, payload_msg, sizeof(payload_msg));
+
+	/* Fill out remaining state members */
+	atomic_set(&state->rx_good, 0);
+	atomic_set(&state->rx_bad, 0);
+	smp_wmb();
+}
+
+static int efx_begin_loopback(struct efx_tx_queue *tx_queue)
+{
+	struct efx_nic *efx = tx_queue->efx;
+	struct efx_loopback_state *state = efx->loopback_selftest;
+	struct efx_loopback_payload *payload;
+	struct sk_buff *skb;
+	int i;
+	netdev_tx_t rc;
+
+	/* Transmit N copies of buffer */
+	for (i = 0; i < state->packet_count; i++) {
+		/* Allocate an skb, holding an extra reference for
+		 * transmit completion counting */
+		skb = alloc_skb(sizeof(state->payload), GFP_KERNEL);
+		if (!skb)
+			return -ENOMEM;
+		state->skbs[i] = skb;
+		skb_get(skb);
+
+		/* Copy the payload in, incrementing the source address to
+		 * exercise the rss vectors */
+		payload = skb_put(skb, sizeof(state->payload));
+		memcpy(payload, &state->payload, sizeof(state->payload));
+		payload->ip.saddr = htonl(INADDR_LOOPBACK | (i << 2));
+
+		/* Ensure everything we've written is visible to the
+		 * interrupt handler. */
+		smp_wmb();
+
+		netif_tx_lock_bh(efx->net_dev);
+		rc = efx_enqueue_skb(tx_queue, skb);
+		netif_tx_unlock_bh(efx->net_dev);
+
+		if (rc != NETDEV_TX_OK) {
+			netif_err(efx, drv, efx->net_dev,
+				  "TX queue %d could not transmit packet %d of "
+				  "%d in %s loopback test\n", tx_queue->label,
+				  i + 1, state->packet_count,
+				  LOOPBACK_MODE(efx));
+
+			/* Defer cleaning up the other skbs for the caller */
+			kfree_skb(skb);
+			return -EPIPE;
+		}
+	}
+
+	return 0;
+}
+
+static int efx_poll_loopback(struct efx_nic *efx)
+{
+	struct efx_loopback_state *state = efx->loopback_selftest;
+
+	return atomic_read(&state->rx_good) == state->packet_count;
+}
+
+static int efx_end_loopback(struct efx_tx_queue *tx_queue,
+			    struct efx_loopback_self_tests *lb_tests)
+{
+	struct efx_nic *efx = tx_queue->efx;
+	struct efx_loopback_state *state = efx->loopback_selftest;
+	struct sk_buff *skb;
+	int tx_done = 0, rx_good, rx_bad;
+	int i, rc = 0;
+
+	netif_tx_lock_bh(efx->net_dev);
+
+	/* Count the number of tx completions, and decrement the refcnt. Any
+	 * skbs not already completed will be free'd when the queue is flushed */
+	for (i = 0; i < state->packet_count; i++) {
+		skb = state->skbs[i];
+		if (skb && !skb_shared(skb))
+			++tx_done;
+		dev_kfree_skb(skb);
+	}
+
+	netif_tx_unlock_bh(efx->net_dev);
+
+	/* Check TX completion and received packet counts */
+	rx_good = atomic_read(&state->rx_good);
+	rx_bad = atomic_read(&state->rx_bad);
+	if (tx_done != state->packet_count) {
+		/* Don't free the skbs; they will be picked up on TX
+		 * overflow or channel teardown.
+		 */
+		netif_err(efx, drv, efx->net_dev,
+			  "TX queue %d saw only %d out of an expected %d "
+			  "TX completion events in %s loopback test\n",
+			  tx_queue->label, tx_done, state->packet_count,
+			  LOOPBACK_MODE(efx));
+		rc = -ETIMEDOUT;
+		/* Allow to fall through so we see the RX errors as well */
+	}
+
+	/* We may always be up to a flush away from our desired packet total */
+	if (rx_good != state->packet_count) {
+		netif_dbg(efx, drv, efx->net_dev,
+			  "TX queue %d saw only %d out of an expected %d "
+			  "received packets in %s loopback test\n",
+			  tx_queue->label, rx_good, state->packet_count,
+			  LOOPBACK_MODE(efx));
+		rc = -ETIMEDOUT;
+		/* Fall through */
+	}
+
+	/* Update loopback test structure */
+	lb_tests->tx_sent[tx_queue->label] += state->packet_count;
+	lb_tests->tx_done[tx_queue->label] += tx_done;
+	lb_tests->rx_good += rx_good;
+	lb_tests->rx_bad += rx_bad;
+
+	return rc;
+}
+
+static int
+efx_test_loopback(struct efx_tx_queue *tx_queue,
+		  struct efx_loopback_self_tests *lb_tests)
+{
+	struct efx_nic *efx = tx_queue->efx;
+	struct efx_loopback_state *state = efx->loopback_selftest;
+	int i, begin_rc, end_rc;
+
+	for (i = 0; i < 3; i++) {
+		/* Determine how many packets to send */
+		state->packet_count = efx->txq_entries / 3;
+		state->packet_count = min(1 << (i << 2), state->packet_count);
+		state->skbs = kcalloc(state->packet_count,
+				      sizeof(state->skbs[0]), GFP_KERNEL);
+		if (!state->skbs)
+			return -ENOMEM;
+		state->flush = false;
+
+		netif_dbg(efx, drv, efx->net_dev,
+			  "TX queue %d (hw %d) testing %s loopback with %d packets\n",
+			  tx_queue->label, tx_queue->queue, LOOPBACK_MODE(efx),
+			  state->packet_count);
+
+		efx_iterate_state(efx);
+		begin_rc = efx_begin_loopback(tx_queue);
+
+		/* This will normally complete very quickly, but be
+		 * prepared to wait much longer. */
+		msleep(1);
+		if (!efx_poll_loopback(efx)) {
+			msleep(LOOPBACK_TIMEOUT_MS);
+			efx_poll_loopback(efx);
+		}
+
+		end_rc = efx_end_loopback(tx_queue, lb_tests);
+		kfree(state->skbs);
+
+		if (begin_rc || end_rc) {
+			/* Wait a while to ensure there are no packets
+			 * floating around after a failure. */
+			schedule_timeout_uninterruptible(HZ / 10);
+			return begin_rc ? begin_rc : end_rc;
+		}
+	}
+
+	netif_dbg(efx, drv, efx->net_dev,
+		  "TX queue %d passed %s loopback test with a burst length "
+		  "of %d packets\n", tx_queue->label, LOOPBACK_MODE(efx),
+		  state->packet_count);
+
+	return 0;
+}
+
+/* Wait for link up. On Falcon, we would prefer to rely on efx_monitor, but
+ * any contention on the mac lock (via e.g. efx_mac_mcast_work) causes it
+ * to delay and retry. Therefore, it's safer to just poll directly. Wait
+ * for link up and any faults to dissipate. */
+static int efx_wait_for_link(struct efx_nic *efx)
+{
+	struct efx_link_state *link_state = &efx->link_state;
+	int count, link_up_count = 0;
+	bool link_up;
+
+	for (count = 0; count < 40; count++) {
+		schedule_timeout_uninterruptible(HZ / 10);
+
+		if (efx->type->monitor != NULL) {
+			mutex_lock(&efx->mac_lock);
+			efx->type->monitor(efx);
+			mutex_unlock(&efx->mac_lock);
+		}
+
+		mutex_lock(&efx->mac_lock);
+		link_up = link_state->up;
+		if (link_up)
+			link_up = !efx->type->check_mac_fault(efx);
+		mutex_unlock(&efx->mac_lock);
+
+		if (link_up) {
+			if (++link_up_count == 2)
+				return 0;
+		} else {
+			link_up_count = 0;
+		}
+	}
+
+	return -ETIMEDOUT;
+}
+
+static int efx_test_loopbacks(struct efx_nic *efx, struct efx_self_tests *tests,
+			      unsigned int loopback_modes)
+{
+	enum efx_loopback_mode mode;
+	struct efx_loopback_state *state;
+	struct efx_channel *channel =
+		efx_get_channel(efx, efx->tx_channel_offset);
+	struct efx_tx_queue *tx_queue;
+	int rc = 0;
+
+	/* Set the port loopback_selftest member. From this point on
+	 * all received packets will be dropped. Mark the state as
+	 * "flushing" so all inflight packets are dropped */
+	state = kzalloc(sizeof(*state), GFP_KERNEL);
+	if (state == NULL)
+		return -ENOMEM;
+	BUG_ON(efx->loopback_selftest);
+	state->flush = true;
+	efx->loopback_selftest = state;
+
+	/* Test all supported loopback modes */
+	for (mode = LOOPBACK_NONE; mode <= LOOPBACK_TEST_MAX; mode++) {
+		if (!(loopback_modes & (1 << mode)))
+			continue;
+
+		/* Move the port into the specified loopback mode. */
+		state->flush = true;
+		mutex_lock(&efx->mac_lock);
+		efx->loopback_mode = mode;
+		rc = __efx_reconfigure_port(efx);
+		mutex_unlock(&efx->mac_lock);
+		if (rc) {
+			netif_err(efx, drv, efx->net_dev,
+				  "unable to move into %s loopback\n",
+				  LOOPBACK_MODE(efx));
+			goto out;
+		}
+
+		rc = efx_wait_for_link(efx);
+		if (rc) {
+			netif_err(efx, drv, efx->net_dev,
+				  "loopback %s never came up\n",
+				  LOOPBACK_MODE(efx));
+			goto out;
+		}
+
+		/* Test all enabled types of TX queue */
+		efx_for_each_channel_tx_queue(tx_queue, channel) {
+			state->offload_csum = (tx_queue->type &
+					       EFX_TXQ_TYPE_OUTER_CSUM);
+			rc = efx_test_loopback(tx_queue,
+					       &tests->loopback[mode]);
+			if (rc)
+				goto out;
+		}
+	}
+
+ out:
+	/* Remove the flush. The caller will remove the loopback setting */
+	state->flush = true;
+	efx->loopback_selftest = NULL;
+	wmb();
+	kfree(state);
+
+	if (rc == -EPERM)
+		rc = 0;
+
+	return rc;
+}
+
+/**************************************************************************
+ *
+ * Entry point
+ *
+ *************************************************************************/
+
+int efx_selftest(struct efx_nic *efx, struct efx_self_tests *tests,
+		 unsigned flags)
+{
+	enum efx_loopback_mode loopback_mode = efx->loopback_mode;
+	int phy_mode = efx->phy_mode;
+	int rc_test = 0, rc_reset, rc;
+
+	efx_selftest_async_cancel(efx);
+
+	/* Online (i.e. non-disruptive) testing
+	 * This checks interrupt generation, event delivery and PHY presence. */
+
+	rc = efx_test_phy_alive(efx, tests);
+	if (rc && !rc_test)
+		rc_test = rc;
+
+	rc = efx_test_nvram(efx, tests);
+	if (rc && !rc_test)
+		rc_test = rc;
+
+	rc = efx_test_interrupts(efx, tests);
+	if (rc && !rc_test)
+		rc_test = rc;
+
+	rc = efx_test_eventq_irq(efx, tests);
+	if (rc && !rc_test)
+		rc_test = rc;
+
+	if (rc_test)
+		return rc_test;
+
+	if (!(flags & ETH_TEST_FL_OFFLINE))
+		return efx_test_phy(efx, tests, flags);
+
+	/* Offline (i.e. disruptive) testing
+	 * This checks MAC and PHY loopback on the specified port. */
+
+	/* Detach the device so the kernel doesn't transmit during the
+	 * loopback test and the watchdog timeout doesn't fire.
+	 */
+	efx_device_detach_sync(efx);
+
+	if (efx->type->test_chip) {
+		rc_reset = efx->type->test_chip(efx, tests);
+		if (rc_reset) {
+			netif_err(efx, hw, efx->net_dev,
+				  "Unable to recover from chip test\n");
+			efx_schedule_reset(efx, RESET_TYPE_DISABLE);
+			return rc_reset;
+		}
+
+		if ((tests->memory < 0 || tests->registers < 0) && !rc_test)
+			rc_test = -EIO;
+	}
+
+	/* Ensure that the phy is powered and out of loopback
+	 * for the bist and loopback tests */
+	mutex_lock(&efx->mac_lock);
+	efx->phy_mode &= ~PHY_MODE_LOW_POWER;
+	efx->loopback_mode = LOOPBACK_NONE;
+	__efx_reconfigure_port(efx);
+	mutex_unlock(&efx->mac_lock);
+
+	rc = efx_test_phy(efx, tests, flags);
+	if (rc && !rc_test)
+		rc_test = rc;
+
+	rc = efx_test_loopbacks(efx, tests, efx->loopback_modes);
+	if (rc && !rc_test)
+		rc_test = rc;
+
+	/* restore the PHY to the previous state */
+	mutex_lock(&efx->mac_lock);
+	efx->phy_mode = phy_mode;
+	efx->loopback_mode = loopback_mode;
+	__efx_reconfigure_port(efx);
+	mutex_unlock(&efx->mac_lock);
+
+	efx_device_attach_if_not_resetting(efx);
+
+	return rc_test;
+}
+
+void efx_selftest_async_start(struct efx_nic *efx)
+{
+	struct efx_channel *channel;
+
+	efx_for_each_channel(channel, efx)
+		efx_nic_event_test_start(channel);
+	schedule_delayed_work(&efx->selftest_work, IRQ_TIMEOUT);
+}
+
+void efx_selftest_async_cancel(struct efx_nic *efx)
+{
+	cancel_delayed_work_sync(&efx->selftest_work);
+}
+
+static void efx_selftest_async_work(struct work_struct *data)
+{
+	struct efx_nic *efx = container_of(data, struct efx_nic,
+					   selftest_work.work);
+	struct efx_channel *channel;
+	int cpu;
+
+	efx_for_each_channel(channel, efx) {
+		cpu = efx_nic_event_test_irq_cpu(channel);
+		if (cpu < 0)
+			netif_err(efx, ifup, efx->net_dev,
+				  "channel %d failed to trigger an interrupt\n",
+				  channel->channel);
+		else
+			netif_dbg(efx, ifup, efx->net_dev,
+				  "channel %d triggered interrupt on CPU %d\n",
+				  channel->channel, cpu);
+	}
+}
+
+void efx_selftest_async_init(struct efx_nic *efx)
+{
+	INIT_DELAYED_WORK(&efx->selftest_work, efx_selftest_async_work);
+}