[net-next 01/15] net/mlx5e: Use vhca id as the hairpin peer identifier

[Saeed Mahameed]

From: Or Gerlitz <ogerl...@mellanox.com>

The peer vhca id spans less bits vs the ifindex and can
well serve for the hairpin hash key, move to use that.

This is a pre-step to put more info into the hairpin hash
key in downstream patch while keeping it at 32 bits.

Signed-off-by: Or Gerlitz <ogerl...@mellanox.com>
Signed-off-by: Saeed Mahameed <sae...@mellanox.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/en_tc.c | 20 ++++++++++++--------
 1 file changed, 12 insertions(+), 8 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c 
b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
index cf528da51243..fac8c91c261b 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
@@ -111,7 +111,7 @@ struct mlx5e_hairpin_entry {
        /* flows sharing the same hairpin */
        struct list_head flows;
 
-       int peer_ifindex;
+       u16 peer_vhca_id;
        struct mlx5e_hairpin *hp;
 };
 
@@ -334,13 +334,13 @@ static void mlx5e_hairpin_destroy(struct mlx5e_hairpin 
*hp)
 }
 
 static struct mlx5e_hairpin_entry *mlx5e_hairpin_get(struct mlx5e_priv *priv,
-                                                    int peer_ifindex)
+                                                    u16 peer_vhca_id)
 {
        struct mlx5e_hairpin_entry *hpe;
 
        hash_for_each_possible(priv->fs.tc.hairpin_tbl, hpe,
-                              hairpin_hlist, peer_ifindex) {
-               if (hpe->peer_ifindex == peer_ifindex)
+                              hairpin_hlist, peer_vhca_id) {
+               if (hpe->peer_vhca_id == peer_vhca_id)
                        return hpe;
        }
 
@@ -353,16 +353,20 @@ static int mlx5e_hairpin_flow_add(struct mlx5e_priv *priv,
 {
        int peer_ifindex = parse_attr->mirred_ifindex;
        struct mlx5_hairpin_params params;
+       struct mlx5_core_dev *peer_mdev;
        struct mlx5e_hairpin_entry *hpe;
        struct mlx5e_hairpin *hp;
+       u16 peer_id;
        int err;
 
-       if (!MLX5_CAP_GEN(priv->mdev, hairpin)) {
+       peer_mdev = mlx5e_hairpin_get_mdev(dev_net(priv->netdev), peer_ifindex);
+       if (!MLX5_CAP_GEN(priv->mdev, hairpin) || !MLX5_CAP_GEN(peer_mdev, 
hairpin)) {
                netdev_warn(priv->netdev, "hairpin is not supported\n");
                return -EOPNOTSUPP;
        }
 
-       hpe = mlx5e_hairpin_get(priv, peer_ifindex);
+       peer_id = MLX5_CAP_GEN(peer_mdev, vhca_id);
+       hpe = mlx5e_hairpin_get(priv, peer_id);
        if (hpe)
                goto attach_flow;
 
@@ -371,7 +375,7 @@ static int mlx5e_hairpin_flow_add(struct mlx5e_priv *priv,
                return -ENOMEM;
 
        INIT_LIST_HEAD(&hpe->flows);
-       hpe->peer_ifindex = peer_ifindex;
+       hpe->peer_vhca_id = peer_id;
 
        params.log_data_size = 15;
        params.log_data_size = min_t(u8, params.log_data_size,
@@ -391,7 +395,7 @@ static int mlx5e_hairpin_flow_add(struct mlx5e_priv *priv,
                   hp->pair->sqn, params.log_data_size);
 
        hpe->hp = hp;
-       hash_add(priv->fs.tc.hairpin_tbl, &hpe->hairpin_hlist, peer_ifindex);
+       hash_add(priv->fs.tc.hairpin_tbl, &hpe->hairpin_hlist, peer_id);
 
 attach_flow:
        flow->nic_attr->hairpin_tirn = hpe->hp->tirn;
-- 
2.13.0