net/mlx5e: Disable rxhash when CQE compress is enabled

When CQE compression is enabled (Multi-host systems), compressed CQEs
might arrive to the driver rx, compressed CQEs don't have a valid hash
offload and the driver already reports a hash value of 0 and invalid hash
type on the skb for compressed CQEs, but this is not good enough.

On a congested PCIe, where CQE compression will kick in aggressively,
gro will deliver lots of out of order packets due to the invalid hash
and this might cause a serious performance drop.

The only valid solution, is to disable rxhash offload at all when CQE
compression is favorable (Multi-host systems).

Fixes: 7219ab34f184 ("net/mlx5e: CQE compression")
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
index 457cc39..c65cefd 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -3687,6 +3687,12 @@ static netdev_features_t mlx5e_fix_features(struct net_device *netdev,
                        netdev_warn(netdev, "Disabling LRO, not supported in legacy RQ\n");
        }
 
+       if (MLX5E_GET_PFLAG(params, MLX5E_PFLAG_RX_CQE_COMPRESS)) {
+               features &= ~NETIF_F_RXHASH;
+               if (netdev->features & NETIF_F_RXHASH)
+                       netdev_warn(netdev, "Disabling rxhash, not supported when CQE compress is active\n");
+       }
+
        mutex_unlock(&priv->state_lock);
 
        return features;
@@ -3812,6 +3818,9 @@ int mlx5e_hwstamp_set(struct mlx5e_priv *priv, struct ifreq *ifr)
        memcpy(&priv->tstamp, &config, sizeof(config));
        mutex_unlock(&priv->state_lock);
 
+       /* might need to fix some features */
+       netdev_update_features(priv->netdev);
+
        return copy_to_user(ifr->ifr_data, &config,
                            sizeof(config)) ? -EFAULT : 0;
 }
@@ -4680,6 +4689,10 @@ static void mlx5e_build_nic_netdev(struct net_device *netdev)
        if (!priv->channels.params.scatter_fcs_en)
                netdev->features  &= ~NETIF_F_RXFCS;
 
+       /* prefere CQE compression over rxhash */
+       if (MLX5E_GET_PFLAG(&priv->channels.params, MLX5E_PFLAG_RX_CQE_COMPRESS))
+               netdev->features &= ~NETIF_F_RXHASH;
+
 #define FT_CAP(f) MLX5_CAP_FLOWTABLE(mdev, flow_table_properties_nic_receive.f)
        if (FT_CAP(flow_modify_en) &&
            FT_CAP(modify_root) &&