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Date: Sat, 10 Mar 2012 00:50:36 +0000
From: Ben Hutchings <bhutchings@...arflare.com>
To: David Miller <davem@...emloft.net>
CC: <netdev@...r.kernel.org>, <linux-net-drivers@...arflare.com>
Subject: [PATCH net-next 06/10] sfc: Test all event queues in parallel
In case all event queues are broken for some reason, this means it
will only take about a second to check them all, rather than up to 32
seconds. This may also speed up testing in the successful case.
Signed-off-by: Ben Hutchings <bhutchings@...arflare.com>
---
drivers/net/ethernet/sfc/selftest.c | 114 ++++++++++++++++++++---------------
1 files changed, 65 insertions(+), 49 deletions(-)
diff --git a/drivers/net/ethernet/sfc/selftest.c b/drivers/net/ethernet/sfc/selftest.c
index dc330b9..e4b4c8a 100644
--- a/drivers/net/ethernet/sfc/selftest.c
+++ b/drivers/net/ethernet/sfc/selftest.c
@@ -178,69 +178,88 @@ static int efx_test_interrupts(struct efx_nic *efx,
}
/* 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;
- bool napi_ran, dma_seen, int_seen;
+ 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;
- read_ptr = channel->eventq_read_ptr;
- channel->last_irq_cpu = -1;
- smp_wmb();
+ 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);
+ channel->last_irq_cpu = -1;
+ smp_wmb();
+ efx_nic_generate_test_event(channel);
+ }
- efx_nic_generate_test_event(channel);
timeout = jiffies + IRQ_TIMEOUT;
wait = 1;
- /* Wait for arrival of interrupt. NAPI processing may or may
+ /* 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);
- napi_disable(&channel->napi_str);
- if (channel->eventq_read_ptr != read_ptr) {
- napi_ran = true;
- dma_seen = true;
- int_seen = true;
- } else {
- napi_ran = false;
- dma_seen = efx_nic_event_present(channel);
- int_seen = ACCESS_ONCE(channel->last_irq_cpu) >= 0;
+ 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 (ACCESS_ONCE(channel->last_irq_cpu) >= 0)
+ clear_bit(channel->channel, &int_pend);
+ }
+ napi_enable(&channel->napi_str);
+ efx_nic_eventq_read_ack(channel);
}
- napi_enable(&channel->napi_str);
- efx_nic_eventq_read_ack(channel);
wait *= 2;
- } while (!(dma_seen && int_seen) && time_before(jiffies, timeout));
-
- tests->eventq_dma[channel->channel] = dma_seen ? 1 : -1;
- tests->eventq_int[channel->channel] = int_seen ? 1 : -1;
+ } while ((dma_pend || int_pend) && time_before(jiffies, timeout));
- if (dma_seen && int_seen) {
- netif_dbg(efx, drv, efx->net_dev,
- "channel %d event queue passed (with%s NAPI)\n",
- channel->channel, napi_ran ? "" : "out");
- return 0;
- } 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)
+ 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 event was generated, but "
- "failed to trigger an interrupt\n",
+ "channel %d timed out waiting for event queue\n",
channel->channel);
- return -ETIMEDOUT;
+ 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,
@@ -687,7 +706,6 @@ 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;
/* Online (i.e. non-disruptive) testing
@@ -705,11 +723,9 @@ 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;
--
1.7.7.6
--
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.
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