net/mlx5e: Order ICOSQ cc update after CQ doorbell

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mlx5e_poll_ico_cq() requires sq->cc to be updated only after
mlx5_cqwq_update_db_record(), otherwise a CQ overrun may occur.

The current implementation updates sq->cc before the CQ doorbell
record, violating this ordering requirement.

Update the CQ doorbell record first and use dma_wmb() before updating
sq->cc. This ensures that the CQ space is released to the device
before the corresponding ICOSQ consumer index is updated by software.

Fixes: fd9b4be800 ("net/mlx5e: RX, Support multiple outstanding UMR posts")
Signed-off-by: Li RongQing <lirongqing@baidu.com>
Reviewed-by: Dragos Tatulea <dtatulea@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Reviewed-by: Daniel Machon <daniel.machon@microchip.com>
Link: https://patch.msgid.link/20261006105820.257208-1-tariqt@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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Li RongQing 2026-10-06 13:58:20 +03:00 • committed by Jakub Kicinski

parent 726be6a0e8

commit b056ca4d37

1 changed files with 4 additions and 2 deletions

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drivers/net/ethernet/mellanox/mlx5/core/en_rx.c

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