mlx4: 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: 7fae69eeff13 ("mlx4: new poll mode driver")

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

diff --git a/drivers/net/mlx4/mlx4.c b/drivers/net/mlx4/mlx4.c
index 4bd0ecd..3e05373 100644 (file)
--- a/drivers/net/mlx4/mlx4.c
+++ b/drivers/net/mlx4/mlx4.c
@@ -1049,7 +1049,7 @@ 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])));
        }