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IB/mlx5: Fix RSS Toeplitz setup to be aligned with the HW specification

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commit b7165bd0d6 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: 28d6137008 ("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>
This commit is contained in:
Yishai Hadas
2019-07-23 09:57:29 +03:00
committed by Chris
parent facf204741
commit 18a84bdf57
1 changed files with 0 additions and 1 deletions
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1
drivers/infiniband/hw/mlx5/qp.c
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@@ -1421,7 +1421,6 @@ static int create_rss_raw_qp_tir(struct mlx5_ib_dev *dev, struct mlx5_ib_qp *qp,
}
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;
}