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gve: Remove the code of clearing PBA bit

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[ Upstream commit f4c2e67c1773d2a2632381ee30e9139c1e744c16 ]

Clearing the PBA bit from the driver is race prone and it may lead to
dropped interrupt events. This could potentially lead to the traffic
being completely halted.

Fixes: 5e8c5adf95 ("gve: DQO: Add core netdev features")
Signed-off-by: Ziwei Xiao <ziweixiao@google.com>
Signed-off-by: Bailey Forrest <bcf@google.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Ziwei Xiao 2023-05-09 15:51:23 -07:00 committed by Greg Kroah-Hartman
parent b4c0af8974
commit d695dccb74
1 changed files with 0 additions and 13 deletions
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13
drivers/net/ethernet/google/gve/gve_main.c
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@ -239,19 +239,6 @@ static int gve_napi_poll_dqo(struct napi_struct *napi, int budget)
bool reschedule = false;
int work_done = 0;
/* Clear PCI MSI-X Pending Bit Array (PBA)
*
* This bit is set if an interrupt event occurs while the vector is
* masked. If this bit is set and we reenable the interrupt, it will
* fire again. Since we're just about to poll the queue state, we don't
* need it to fire again.
*
* Under high softirq load, it's possible that the interrupt condition
* is triggered twice before we got the chance to process it.
*/
gve_write_irq_doorbell_dqo(priv, block,
GVE_ITR_NO_UPDATE_DQO | GVE_ITR_CLEAR_PBA_BIT_DQO);
if (block->tx)
reschedule |= gve_tx_poll_dqo(block, /*do_clean=*/true);