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mlx4: fix mlx4_en_set_rxfh() 

mlx4_en_set_rxfh() can crash if no RSS indir table is provided.

While we are at it, allow RSS key to be changed with ethtool -X

Tested:

myhost:~# cat /proc/sys/net/core/netdev_rss_key
b6:89:91:f3:b2:c3:c2:90:11:e8:ce:45:e8:a9:9d:1c:f2:f6:d4:53:61:8b:26:3a:b3:9a:57:97:c3:b6:79:4d:2e:d9:66:5c:72:ed:b6:8e:c5:5d:4d:8c:22:67:30🆎8a:6e:c3:6a

myhost:~# ethtool -x eth0
RX flow hash indirection table for eth0 with 8 RX ring(s):
    0:      0     1     2     3     4     5     6     7
RSS hash key:
b6:89:91:f3:b2:c3:c2:90:11:e8:ce:45:e8:a9:9d:1c:f2:f6:d4:53:61:8b:26:3a:b3:9a:57:97:c3:b6:79:4d:2e:d9:66:5c:72:ed:b6:8e

myhost:~# ethtool -X eth0 hkey \
03:0e:e2:43:fa:82:0e:73:14:2d:c0:68:21:9e:82:99:b9:84:d0:22:e2:b3:64:9f:4a:af:00:fa:cc:05:b4:4a:17:05:14:73:76:58:bd:2f

myhost:~# ethtool -x eth0
RX flow hash indirection table for eth0 with 8 RX ring(s):
    0:      0     1     2     3     4     5     6     7
RSS hash key:
03:0e:e2:43:fa:82:0e:73:14:2d:c0:68:21:9e:82:99:b9:84:d0:22:e2:b3:64:9f:4a:af:00:fa:cc:05:b4:4a:17:05:14:73:76:58:bd:2f

Reported-by: Ben Hutchings <ben@decadent.org.uk>
Fixes: b9d1ab7eb4 ("mlx4: use netdev_rss_key_fill() helper")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Amir Vadai <amirv@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2014-11-22 17:24:19 -08:00 committed by David S. Miller
parent 100414137e
commit bd635c354d
4 changed files with 10 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/net/ethernet/mellanox/mlx4/en_ethtool.c
View File

@ -994,7 +994,7 @@ static int mlx4_en_get_rxfh(struct net_device *dev, u32 *ring_index, u8 *key)
rss_map->base_qpn;
}
if (key)
netdev_rss_key_fill(key, MLX4_EN_RSS_KEY_SIZE);
memcpy(key, priv->rss_key, MLX4_EN_RSS_KEY_SIZE);
return err;
}
@ -1012,6 +1012,8 @@ static int mlx4_en_set_rxfh(struct net_device *dev, const u32 *ring_index,
* between rings
*/
for (i = 0; i < priv->rx_ring_num; i++) {
if (!ring_index)
continue;
if (i > 0 && !ring_index[i] && !rss_rings)
rss_rings = i;
@ -1032,8 +1034,10 @@ static int mlx4_en_set_rxfh(struct net_device *dev, const u32 *ring_index,
mlx4_en_stop_port(dev, 1);
}
priv->prof->rss_rings = rss_rings;
if (ring_index)
priv->prof->rss_rings = rss_rings;
if (key)
memcpy(priv->rss_key, key, MLX4_EN_RSS_KEY_SIZE);
if (port_up) {
err = mlx4_en_start_port(dev);
if (err)

1
drivers/net/ethernet/mellanox/mlx4/en_netdev.c
View File

@ -2493,6 +2493,7 @@ int mlx4_en_init_netdev(struct mlx4_en_dev *mdev, int port,
priv->num_tx_rings_p_up = mdev->profile.num_tx_rings_p_up;
priv->tx_ring_num = prof->tx_ring_num;
priv->tx_work_limit = MLX4_EN_DEFAULT_TX_WORK;
netdev_rss_key_fill(priv->rss_key, sizeof(priv->rss_key));
priv->tx_ring = kzalloc(sizeof(struct mlx4_en_tx_ring *) * MAX_TX_RINGS,
GFP_KERNEL);

3
drivers/net/ethernet/mellanox/mlx4/en_rx.c
View File

@ -1223,8 +1223,7 @@ int mlx4_en_config_rss_steer(struct mlx4_en_priv *priv)
rss_context->flags = rss_mask;
rss_context->hash_fn = MLX4_RSS_HASH_TOP;
netdev_rss_key_fill(rss_context->rss_key, MLX4_EN_RSS_KEY_SIZE);
memcpy(rss_context->rss_key, priv->rss_key, MLX4_EN_RSS_KEY_SIZE);
err = mlx4_qp_to_ready(mdev->dev, &priv->res.mtt, &context,
&rss_map->indir_qp, &rss_map->indir_state);
if (err)

1
drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
View File

@ -618,6 +618,7 @@ struct mlx4_en_priv {
__be16 vxlan_port;
u32 pflags;
u8 rss_key[MLX4_EN_RSS_KEY_SIZE];
};
enum mlx4_en_wol {