From: Yishai Hadas yishaih@mellanox.com
commit b7165bd0d6cbb93732559be6ea8774653b204480 upstream.
The specification for the Toeplitz function doesn't require to set the key explicitly to be symmetric. In case a symmetric functionality is required a symmetric key can be simply used.
Wrongly forcing the algorithm to symmetric causes the wrong packet distribution and a performance degradation.
Link: https://lore.kernel.org/r/20190723065733.4899-7-leon@kernel.org Cc: stable@vger.kernel.org # 4.7 Fixes: 28d6137008b2 ("IB/mlx5: Add RSS QP support") Signed-off-by: Yishai Hadas yishaih@mellanox.com Reviewed-by: Alex Vainman alexv@mellanox.com Signed-off-by: Leon Romanovsky leonro@mellanox.com Signed-off-by: Jason Gunthorpe jgg@mellanox.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/infiniband/hw/mlx5/qp.c | 1 - 1 file changed, 1 deletion(-)
--- a/drivers/infiniband/hw/mlx5/qp.c +++ b/drivers/infiniband/hw/mlx5/qp.c @@ -1421,7 +1421,6 @@ static int create_rss_raw_qp_tir(struct }
MLX5_SET(tirc, tirc, rx_hash_fn, MLX5_RX_HASH_FN_TOEPLITZ); - MLX5_SET(tirc, tirc, rx_hash_symmetric, 1); memcpy(rss_key, ucmd.rx_hash_key, len); break; }