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ionic: Prevent tx_timeout due to frequent doorbell ringing

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With recent work to the doorbell workaround code a small hole was
introduced that could cause a tx_timeout. This happens if the rx
dbell_deadline goes beyond the netdev watchdog timeout set by the driver
(i.e. 2 seconds). Fix this by changing the netdev watchdog timeout to 5
seconds and reduce the max rx dbell_deadline to 4 seconds.

The test that can reproduce the issue being fixed is a multi-queue send
test via pktgen with the "burst" setting to 1. This causes the queue's
doorbell to be rung on every packet sent to the driver, which may result
in the device missing doorbells due to the high doorbell rate.

Cc: stable@vger.kernel.org
Fixes: 4ded136c78 ("ionic: add work item for missed-doorbell check")
Signed-off-by: Brett Creeley <brett.creeley@amd.com>
Reviewed-by: Shannon Nelson <shannon.nelson@amd.com>
Link: https://patch.msgid.link/20240822192557.9089-1-brett.creeley@amd.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Brett Creeley 2024-08-22 12:25:57 -07:00 committed by Paolo Abeni
parent e846be0fba
commit 4786fe29f5
2 changed files with 2 additions and 2 deletions
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2
drivers/net/ethernet/pensando/ionic/ionic_dev.h
View File

@ -32,7 +32,7 @@
#define IONIC_ADMIN_DOORBELL_DEADLINE (HZ / 2) /* 500ms */
#define IONIC_TX_DOORBELL_DEADLINE (HZ / 100) /* 10ms */
#define IONIC_RX_MIN_DOORBELL_DEADLINE (HZ / 100) /* 10ms */
#define IONIC_RX_MAX_DOORBELL_DEADLINE (HZ * 5) /* 5s */
#define IONIC_RX_MAX_DOORBELL_DEADLINE (HZ * 4) /* 4s */
struct ionic_dev_bar {
void __iomem *vaddr;

2
drivers/net/ethernet/pensando/ionic/ionic_lif.c
View File

@ -3220,7 +3220,7 @@ int ionic_lif_alloc(struct ionic *ionic)
netdev->netdev_ops = &ionic_netdev_ops;
ionic_ethtool_set_ops(netdev);
netdev->watchdog_timeo = 2 * HZ;
netdev->watchdog_timeo = 5 * HZ;
netif_carrier_off(netdev);
lif->identity = lid;