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path: root/drivers/net/ethernet/sfc/selftest.c
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Diffstat (limited to 'drivers/net/ethernet/sfc/selftest.c')
-rw-r--r--drivers/net/ethernet/sfc/selftest.c218
1 files changed, 144 insertions, 74 deletions
diff --git a/drivers/net/ethernet/sfc/selftest.c b/drivers/net/ethernet/sfc/selftest.c
index 52edd24fcde..de4c0069f5b 100644
--- a/drivers/net/ethernet/sfc/selftest.c
+++ b/drivers/net/ethernet/sfc/selftest.c
@@ -19,13 +19,22 @@
#include <linux/udp.h>
#include <linux/rtnetlink.h>
#include <linux/slab.h>
-#include <asm/io.h>
#include "net_driver.h"
#include "efx.h"
#include "nic.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
*
@@ -50,7 +59,7 @@ static const char payload_msg[] =
/* Interrupt mode names */
static const unsigned int efx_interrupt_mode_max = EFX_INT_MODE_MAX;
-static const char *efx_interrupt_mode_names[] = {
+static const char *const efx_interrupt_mode_names[] = {
[EFX_INT_MODE_MSIX] = "MSI-X",
[EFX_INT_MODE_MSI] = "MSI",
[EFX_INT_MODE_LEGACY] = "legacy",
@@ -78,6 +87,9 @@ struct efx_loopback_state {
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
@@ -131,87 +143,117 @@ static int efx_test_chip(struct efx_nic *efx, struct efx_self_tests *tests)
static int efx_test_interrupts(struct efx_nic *efx,
struct efx_self_tests *tests)
{
+ unsigned long timeout, wait;
+ int cpu;
+
netif_dbg(efx, drv, efx->net_dev, "testing interrupts\n");
tests->interrupt = -1;
- /* Reset interrupt flag */
- efx->last_irq_cpu = -1;
- smp_wmb();
-
- efx_nic_generate_interrupt(efx);
+ efx_nic_irq_test_start(efx);
+ timeout = jiffies + IRQ_TIMEOUT;
+ wait = 1;
/* Wait for arrival of test interrupt. */
netif_dbg(efx, drv, efx->net_dev, "waiting for test interrupt\n");
- schedule_timeout_uninterruptible(HZ / 10);
- if (efx->last_irq_cpu >= 0)
- goto success;
+ 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),
- efx->last_irq_cpu);
+ INT_MODE(efx), cpu);
tests->interrupt = 1;
return 0;
}
/* Test generation and receipt of interrupting events */
-static int efx_test_eventq_irq(struct efx_channel *channel,
+static int efx_test_eventq_irq(struct efx_nic *efx,
struct efx_self_tests *tests)
{
- struct efx_nic *efx = channel->efx;
- unsigned int read_ptr, count;
+ 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;
- tests->eventq_dma[channel->channel] = -1;
- tests->eventq_int[channel->channel] = -1;
- tests->eventq_poll[channel->channel] = -1;
+ BUILD_BUG_ON(EFX_MAX_CHANNELS > BITS_PER_LONG);
- read_ptr = channel->eventq_read_ptr;
- channel->efx->last_irq_cpu = -1;
- smp_wmb();
+ 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);
+ }
- efx_nic_generate_test_event(channel);
+ timeout = jiffies + IRQ_TIMEOUT;
+ wait = 1;
- /* Wait for arrival of interrupt */
- count = 0;
+ /* 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(HZ / 100);
-
- if (ACCESS_ONCE(channel->eventq_read_ptr) != read_ptr)
- goto eventq_ok;
- } while (++count < 2);
-
- netif_err(efx, drv, efx->net_dev,
- "channel %d timed out waiting for event queue\n",
- channel->channel);
+ schedule_timeout_uninterruptible(wait);
+
+ efx_for_each_channel(channel, efx) {
+ napi_disable(&channel->napi_str);
+ 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);
+ }
+ napi_enable(&channel->napi_str);
+ efx_nic_eventq_read_ack(channel);
+ }
- /* See if interrupt arrived */
- if (channel->efx->last_irq_cpu >= 0) {
- netif_err(efx, drv, efx->net_dev,
- "channel %d saw interrupt on CPU%d "
- "during event queue test\n", channel->channel,
- raw_smp_processor_id());
- tests->eventq_int[channel->channel] = 1;
- }
+ wait *= 2;
+ } while ((dma_pend || int_pend) && time_before(jiffies, timeout));
- /* Check to see if event was received even if interrupt wasn't */
- if (efx_nic_event_present(channel)) {
- netif_err(efx, drv, efx->net_dev,
- "channel %d event was generated, but "
- "failed to trigger an interrupt\n", channel->channel);
- tests->eventq_dma[channel->channel] = 1;
+ 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 -ETIMEDOUT;
- eventq_ok:
- netif_dbg(efx, drv, efx->net_dev, "channel %d event queue passed\n",
- channel->channel);
- tests->eventq_dma[channel->channel] = 1;
- tests->eventq_int[channel->channel] = 1;
- tests->eventq_poll[channel->channel] = 1;
- return 0;
+ return (dma_pend || int_pend) ? -ETIMEDOUT : 0;
}
static int efx_test_phy(struct efx_nic *efx, struct efx_self_tests *tests,
@@ -316,7 +358,7 @@ void efx_loopback_rx_packet(struct efx_nic *efx,
return;
err:
-#ifdef EFX_ENABLE_DEBUG
+#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,
@@ -395,11 +437,9 @@ static int efx_begin_loopback(struct efx_tx_queue *tx_queue)
* interrupt handler. */
smp_wmb();
- if (efx_dev_registered(efx))
- netif_tx_lock_bh(efx->net_dev);
+ netif_tx_lock_bh(efx->net_dev);
rc = efx_enqueue_skb(tx_queue, skb);
- if (efx_dev_registered(efx))
- netif_tx_unlock_bh(efx->net_dev);
+ netif_tx_unlock_bh(efx->net_dev);
if (rc != NETDEV_TX_OK) {
netif_err(efx, drv, efx->net_dev,
@@ -440,20 +480,18 @@ static int efx_end_loopback(struct efx_tx_queue *tx_queue,
int tx_done = 0, rx_good, rx_bad;
int i, rc = 0;
- if (efx_dev_registered(efx))
- netif_tx_lock_bh(efx->net_dev);
+ 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++) {
+ for (i = 0; i < state->packet_count; i++) {
skb = state->skbs[i];
if (skb && !skb_shared(skb))
++tx_done;
dev_kfree_skb_any(skb);
}
- if (efx_dev_registered(efx))
- netif_tx_unlock_bh(efx->net_dev);
+ netif_tx_unlock_bh(efx->net_dev);
/* Check TX completion and received packet counts */
rx_good = atomic_read(&state->rx_good);
@@ -518,10 +556,10 @@ efx_test_loopback(struct efx_tx_queue *tx_queue,
begin_rc = efx_begin_loopback(tx_queue);
/* This will normally complete very quickly, but be
- * prepared to wait up to 100 ms. */
+ * prepared to wait much longer. */
msleep(1);
if (!efx_poll_loopback(efx)) {
- msleep(100);
+ msleep(LOOPBACK_TIMEOUT_MS);
efx_poll_loopback(efx);
}
@@ -570,7 +608,7 @@ static int efx_wait_for_link(struct efx_nic *efx)
mutex_lock(&efx->mac_lock);
link_up = link_state->up;
if (link_up)
- link_up = !efx->mac_op->check_fault(efx);
+ link_up = !efx->type->check_mac_fault(efx);
mutex_unlock(&efx->mac_lock);
if (link_up) {
@@ -662,9 +700,10 @@ int efx_selftest(struct efx_nic *efx, struct efx_self_tests *tests,
enum efx_loopback_mode loopback_mode = efx->loopback_mode;
int phy_mode = efx->phy_mode;
enum reset_type reset_method = RESET_TYPE_INVISIBLE;
- struct efx_channel *channel;
int rc_test = 0, rc_reset = 0, rc;
+ efx_selftest_async_cancel(efx);
+
/* Online (i.e. non-disruptive) testing
* This checks interrupt generation, event delivery and PHY presence. */
@@ -680,11 +719,9 @@ int efx_selftest(struct efx_nic *efx, struct efx_self_tests *tests,
if (rc && !rc_test)
rc_test = rc;
- efx_for_each_channel(channel, efx) {
- rc = efx_test_eventq_irq(channel, 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;
@@ -759,3 +796,36 @@ int efx_selftest(struct efx_nic *efx, struct efx_self_tests *tests,
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);
+}
+
+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);
+ }
+}