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net/mlx5e: RX, Remove HW LRO support in legacy RQ

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Current LRO implementation in Legacy RQ uses high-order pages.
In downstream patches of this series we complete the transition
to using only order-0 pages in RX datapath (which was already done
in Striding RQ).

Unlike the more advanced Striding RQ, Legacy RQ does not make reuse
of any non-consumed buffers of non-full LRO sessions, and combining
it with order-0 pages has many performance drawbacks.

Hence, here we totally remove LRO support in Legacy RQ.
This guarantees having no out-of-order completions, which allows using
a cyclic work queue (instead of a linked-list) in a downstream patch.

Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
This commit is contained in:
Tariq Toukan 2018-04-02 16:28:10 +03:00 committed by Saeed Mahameed
parent 386471f16b
commit 6c3a823e1e
2 changed files with 26 additions and 14 deletions
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7
drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c
View File

@ -1515,6 +1515,9 @@ static int set_pflag_rx_striding_rq(struct net_device *netdev, bool enable)
return -EOPNOTSUPP;
if (!mlx5e_striding_rq_possible(mdev, &priv->channels.params))
return -EINVAL;
} else if (priv->channels.params.lro_en) {
netdev_warn(netdev, "Can't set legacy RQ with LRO, disable LRO first\n");
return -EINVAL;
}
new_channels.params = priv->channels.params;
@ -1589,6 +1592,10 @@ static int mlx5e_set_priv_flags(struct net_device *netdev, u32 pflags)
out:
mutex_unlock(&priv->state_lock);
/* Need to fix some features.. */
netdev_update_features(netdev);
return err;
}

33
drivers/net/ethernet/mellanox/mlx5/core/en_main.c
View File

@ -182,14 +182,6 @@ void mlx5e_init_rq_type_params(struct mlx5_core_dev *mdev,
params->log_rq_mtu_frames = is_kdump_kernel() ?
MLX5E_PARAMS_MINIMUM_LOG_RQ_SIZE :
MLX5E_PARAMS_DEFAULT_LOG_RQ_SIZE;
switch (params->rq_wq_type) {
case MLX5_WQ_TYPE_LINKED_LIST_STRIDING_RQ:
break;
default: /* MLX5_WQ_TYPE_LINKED_LIST */
/* Extra room needed for build_skb */
params->lro_wqe_sz -= mlx5e_get_rq_headroom(mdev, params) +
SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
}
mlx5_core_info(mdev, "MLX5E: StrdRq(%d) RqSz(%ld) StrdSz(%ld) RxCqeCmprss(%d)\n",
params->rq_wq_type == MLX5_WQ_TYPE_LINKED_LIST_STRIDING_RQ,
@ -503,14 +495,12 @@ static int mlx5e_alloc_rq(struct mlx5e_channel *c,
goto err_rq_wq_destroy;
}
byte_count = params->lro_en ?
params->lro_wqe_sz :
MLX5E_SW2HW_MTU(params, params->sw_mtu);
byte_count = MLX5E_SW2HW_MTU(params, params->sw_mtu);
#ifdef CONFIG_MLX5_EN_IPSEC
if (MLX5_IPSEC_DEV(mdev))
byte_count += MLX5E_METADATA_ETHER_LEN;
#endif
rq->wqe.page_reuse = !params->xdp_prog && !params->lro_en;
rq->wqe.page_reuse = !params->xdp_prog;
/* calc the required page order */
rq->wqe.frag_sz = MLX5_SKB_FRAG_SZ(rq->buff.headroom + byte_count);
@ -3311,6 +3301,12 @@ static int set_feature_lro(struct net_device *netdev, bool enable)
mutex_lock(&priv->state_lock);
old_params = &priv->channels.params;
if (enable && !MLX5E_GET_PFLAG(old_params, MLX5E_PFLAG_RX_STRIDING_RQ)) {
netdev_warn(netdev, "can't set LRO with legacy RQ\n");
err = -EINVAL;
goto out;
}
reset = test_bit(MLX5E_STATE_OPENED, &priv->state);
new_channels.params = *old_params;
@ -3480,16 +3476,24 @@ static netdev_features_t mlx5e_fix_features(struct net_device *netdev,
netdev_features_t features)
{
struct mlx5e_priv *priv = netdev_priv(netdev);
struct mlx5e_params *params;
mutex_lock(&priv->state_lock);
params = &priv->channels.params;
if (!bitmap_empty(priv->fs.vlan.active_svlans, VLAN_N_VID)) {
/* HW strips the outer C-tag header, this is a problem
* for S-tag traffic.
*/
features &= ~NETIF_F_HW_VLAN_CTAG_RX;
if (!priv->channels.params.vlan_strip_disable)
if (!params->vlan_strip_disable)
netdev_warn(netdev, "Dropping C-tag vlan stripping offload due to S-tag vlan\n");
}
if (!MLX5E_GET_PFLAG(params, MLX5E_PFLAG_RX_STRIDING_RQ)) {
features &= ~NETIF_F_LRO;
if (params->lro_en)
netdev_warn(netdev, "Disabling LRO, not supported in legacy RQ\n");
}
mutex_unlock(&priv->state_lock);
return features;
@ -4328,7 +4332,8 @@ static void mlx5e_build_nic_netdev(struct net_device *netdev)
netdev->hw_enc_features |= NETIF_F_HW_VLAN_CTAG_TX;
netdev->hw_enc_features |= NETIF_F_HW_VLAN_CTAG_RX;
if (!!MLX5_CAP_ETH(mdev, lro_cap))
if (!!MLX5_CAP_ETH(mdev, lro_cap) &&
mlx5e_check_fragmented_striding_rq_cap(mdev))
netdev->vlan_features |= NETIF_F_LRO;
netdev->hw_features = netdev->vlan_features;