4.20-stable review patch. If anyone has any objections, please let me know.
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[ Upstream commit d5585b7b6846a6d0f9517afe57be3843150719da ]
If a TX hang occurs, we attempt to recover by incrementally resetting. If we're starved for CPU time, it's possible the reset doesn't actually complete (or even fire) before another tx_timeout fires causing us to fly through the different resets without actually doing them.
This adds a bit to set and check if a timeout recovery is already pending and, if so, bail out of tx_timeout. The bit will get cleared at the end of i40e_rebuild when reset is complete.
Signed-off-by: Alan Brady alan.brady@intel.com Tested-by: Andrew Bowers andrewx.bowers@intel.com Signed-off-by: Jeff Kirsher jeffrey.t.kirsher@intel.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/ethernet/intel/i40e/i40e.h | 1 + drivers/net/ethernet/intel/i40e/i40e_main.c | 5 +++++ 2 files changed, 6 insertions(+)
diff --git a/drivers/net/ethernet/intel/i40e/i40e.h b/drivers/net/ethernet/intel/i40e/i40e.h index 876cac317e79..8245ff12fd64 100644 --- a/drivers/net/ethernet/intel/i40e/i40e.h +++ b/drivers/net/ethernet/intel/i40e/i40e.h @@ -122,6 +122,7 @@ enum i40e_state_t { __I40E_MDD_EVENT_PENDING, __I40E_VFLR_EVENT_PENDING, __I40E_RESET_RECOVERY_PENDING, + __I40E_TIMEOUT_RECOVERY_PENDING, __I40E_MISC_IRQ_REQUESTED, __I40E_RESET_INTR_RECEIVED, __I40E_REINIT_REQUESTED, diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c index 0e5dc74b4ef2..419cf3faada6 100644 --- a/drivers/net/ethernet/intel/i40e/i40e_main.c +++ b/drivers/net/ethernet/intel/i40e/i40e_main.c @@ -338,6 +338,10 @@ static void i40e_tx_timeout(struct net_device *netdev) (pf->tx_timeout_last_recovery + netdev->watchdog_timeo))) return; /* don't do any new action before the next timeout */
+ /* don't kick off another recovery if one is already pending */ + if (test_and_set_bit(__I40E_TIMEOUT_RECOVERY_PENDING, pf->state)) + return; + if (tx_ring) { head = i40e_get_head(tx_ring); /* Read interrupt register */ @@ -9632,6 +9636,7 @@ end_core_reset: clear_bit(__I40E_RESET_FAILED, pf->state); clear_recovery: clear_bit(__I40E_RESET_RECOVERY_PENDING, pf->state); + clear_bit(__I40E_TIMEOUT_RECOVERY_PENDING, pf->state); }
/**