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net/mlx4: Add RSS support for fragmented IP datagrams

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Enable RSS support for fragmented IP packets, when device supports it.
Until now, fragmented IP packets were directed only to the default_qpn.
Since IP fragments (datagram) have no upper protocols (L3 IP packets),
hash is performed on 3-tuple - dst MAC, source IP and dest IP. The HW
makes sure that this holds for the 1st fragment too, so all fragments
go to the same QP.

Signed-off-by: Ido Shamay <idos@mellanox.com>
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ido Shamay
2015-04-02 16:31:06 +03:00
committed by David S. Miller
parent 9f0d34bc34
commit 802f42a8d9
4 changed files with 16 additions and 0 deletions
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2
drivers/net/ethernet/mellanox/mlx4/main.c
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@@ -885,6 +885,8 @@ static int mlx4_slave_cap(struct mlx4_dev *dev)
mlx4_warn(dev, "Timestamping is not supported in slave mode\n");
slave_adjust_steering_mode(dev, &dev_cap, &hca_param);
mlx4_dbg(dev, "RSS support for IP fragments is %s\n",
hca_param.rss_ip_frags ? "on" : "off");
if (func_cap.extra_flags & MLX4_QUERY_FUNC_FLAGS_BF_RES_QP &&
dev->caps.bf_reg_size)