Re: [PATCH net V2] net/mlx5e: Order ICOSQ cc update after CQ doorbell

From: Li RongQing <redacted>

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.

Reviewed-by: Daniel Machon <daniel.machon@microchip.com>