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net/mlx5: E-Switch, Restore chain id on miss

Browse source 
Chain ids are mapped to the lower part of reg C, and after loopback
are copied to to CQE via a restore rule's flow_tag.

To let tc continue in the correct chain, we find the corresponding
chain id in the eswitch chain id <-> reg C mapping, and set the SKB's
tc extension chain to it.

That tells tc to continue processing from this set chain.

Signed-off-by: Paul Blakey <paulb@mellanox.com>
Reviewed-by: Roi Dayan <roid@mellanox.com>
Reviewed-by: Oz Shlomo <ozsh@mellanox.com>
Reviewed-by: Mark Bloch <markb@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
This commit is contained in:
Paul Blakey 2020-02-16 12:01:30 +02:00 committed by Saeed Mahameed
parent dfd9e7500c
commit d6d2778286
3 changed files with 51 additions and 0 deletions
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6
drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
View file

@ -1225,6 +1225,9 @@ void mlx5e_handle_rx_cqe_rep(struct mlx5e_rq *rq, struct mlx5_cqe64 *cqe)
if (rep->vlan && skb_vlan_tag_present(skb))
skb_vlan_pop(skb);
if (!mlx5e_tc_rep_update_skb(cqe, skb))
goto free_wqe;
napi_gro_receive(rq->cq.napi, skb);
free_wqe:
@ -1275,6 +1278,9 @@ void mlx5e_handle_rx_cqe_mpwrq_rep(struct mlx5e_rq *rq,
mlx5e_complete_rx_cqe(rq, cqe, cqe_bcnt, skb);
if (!mlx5e_tc_rep_update_skb(cqe, skb))
goto mpwrq_cqe_out;
napi_gro_receive(rq->cq.napi, skb);
mpwrq_cqe_out:

43
drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
View file

@ -4339,3 +4339,46 @@ void mlx5e_tc_reoffload_flows_work(struct work_struct *work)
}
mutex_unlock(&rpriv->unready_flows_lock);
}
bool mlx5e_tc_rep_update_skb(struct mlx5_cqe64 *cqe,
struct sk_buff *skb)
{
#if IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
struct tc_skb_ext *tc_skb_ext;
struct mlx5_eswitch *esw;
struct mlx5e_priv *priv;
u32 chain = 0, reg_c0;
int err;
reg_c0 = (be32_to_cpu(cqe->sop_drop_qpn) & MLX5E_TC_FLOW_ID_MASK);
if (reg_c0 == MLX5_FS_DEFAULT_FLOW_TAG)
reg_c0 = 0;
if (!reg_c0)
return true;
priv = netdev_priv(skb->dev);
esw = priv->mdev->priv.eswitch;
err = mlx5_eswitch_get_chain_for_tag(esw, reg_c0, &chain);
if (err) {
netdev_dbg(priv->netdev,
"Couldn't find chain for chain tag: %d, err: %d\n",
reg_c0, err);
return false;
}
if (!chain)
return true;
tc_skb_ext = skb_ext_add(skb, TC_SKB_EXT);
if (!tc_skb_ext) {
WARN_ON_ONCE(1);
return false;
}
tc_skb_ext->chain = chain;
#endif /* CONFIG_NET_TC_SKB_EXT */
return true;
}

2
drivers/net/ethernet/mellanox/mlx5/core/en_tc.h
View file

@ -106,6 +106,8 @@ extern struct mlx5e_tc_attr_to_reg_mapping mlx5e_tc_attr_to_reg_mappings[];
bool mlx5e_is_valid_eswitch_fwd_dev(struct mlx5e_priv *priv,
struct net_device *out_dev);
bool mlx5e_tc_rep_update_skb(struct mlx5_cqe64 *cqe, struct sk_buff *skb);
#else /* CONFIG_MLX5_ESWITCH */
static inline int mlx5e_tc_nic_init(struct mlx5e_priv *priv) { return 0; }
static inline void mlx5e_tc_nic_cleanup(struct mlx5e_priv *priv) {}