[v1,4/9] net/mlx5: mitigate Rx doorbell memory barrier
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Commit Message
The RQ WQEs must be written in the memory before the HW gets the RQ
doorbell, hence a memory barrier should be triggered after the WQEs
writing and before the doorbell writing.
The current code used rte_wmb barrier which ensures that all the memory
stores were done while it is enough to use rte_cio_wmb barrier for the
local memory stores because the WQEs are in local memory.
CC: stable@dpdk.org
Signed-off-by: Matan Azrad <matan@mellanox.com>
---
drivers/net/mlx5/mlx5_rxq.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
@@ -1009,7 +1009,7 @@ struct mlx5_rxq_ibv *
rxq_data->decompressed = 0;
/* Update doorbell counter. */
rxq_data->rq_ci = wqe_n >> rxq_data->sges_n;
- rte_wmb();
+ rte_cio_wmb();
*rxq_data->rq_db = rte_cpu_to_be_32(rxq_data->rq_ci);
DRV_LOG(DEBUG, "port %u rxq %u updated with %p", dev->data->port_id,
idx, (void *)&tmpl);