mlx5: fix local protection error when Tx MP to MR cache is full

When MP to MR cache is full, the last (newest) MR is freed instead of the
first (oldest) one, causing local protection errors during TX.

Fixes: 2e22920b85d9 ("mlx5: support non-scattered Tx and Rx")

Signed-off-by: Olga Shern <olgas@mellanox.com>
Signed-off-by: Adrien Mazarguil <adrien.mazarguil@6wind.com>

diff --git a/drivers/net/mlx5/mlx5_rxtx.c b/drivers/net/mlx5/mlx5_rxtx.c
index c6c167c..eb6c9f7 100644 (file)
--- a/drivers/net/mlx5/mlx5_rxtx.c
+++ b/drivers/net/mlx5/mlx5_rxtx.c
@@ -179,7 +179,7 @@ txq_mp2mr(struct txq *txq, const struct rte_mempool *mp)
                DEBUG("%p: MR <-> MP table full, dropping oldest entry.",
                      (void *)txq);
                --i;
-               claim_zero(ibv_dereg_mr(txq->mp2mr[i].mr));
+               claim_zero(ibv_dereg_mr(txq->mp2mr[0].mr));
                memmove(&txq->mp2mr[0], &txq->mp2mr[1],
                        (sizeof(txq->mp2mr) - sizeof(txq->mp2mr[0])));
        }