net/mlx5e: Add offloading of NIC TC pedit (header re-write) actions

This includes calling the parsing code that translates from pedit
speak to the HW API, allocation (deallocation) of a modify header
context and setting the modify header id associated with this
context to the FTE of that flow.

Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Reviewed-by: Hadar Hen Zion <hadarh@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
index 3a31195..4045b47 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
@@ -52,6 +52,7 @@
 struct mlx5_nic_flow_attr {
        u32 action;
        u32 flow_tag;
+       u32 mod_hdr_id;
 };
 
 enum {
@@ -97,10 +98,12 @@ mlx5e_tc_add_nic_flow(struct mlx5e_priv *priv,
                .action = attr->action,
                .flow_tag = attr->flow_tag,
                .encap_id = 0,
+               .modify_id = attr->mod_hdr_id,
        };
        struct mlx5_fc *counter = NULL;
        struct mlx5_flow_handle *rule;
        bool table_created = false;
+       int err;
 
        if (attr->action & MLX5_FLOW_CONTEXT_ACTION_FWD_DEST) {
                dest.type = MLX5_FLOW_DESTINATION_TYPE_FLOW_TABLE;
@@ -114,6 +117,18 @@ mlx5e_tc_add_nic_flow(struct mlx5e_priv *priv,
                dest.counter = counter;
        }
 
+       if (attr->action & MLX5_FLOW_CONTEXT_ACTION_MOD_HDR) {
+               err = mlx5_modify_header_alloc(dev, MLX5_FLOW_NAMESPACE_KERNEL,
+                                              parse_attr->num_mod_hdr_actions,
+                                              parse_attr->mod_hdr_actions,
+                                              &attr->mod_hdr_id);
+               kfree(parse_attr->mod_hdr_actions);
+               if (err) {
+                       rule = ERR_PTR(err);
+                       goto err_create_mod_hdr_id;
+               }
+       }
+
        if (IS_ERR_OR_NULL(priv->fs.tc.t)) {
                priv->fs.tc.t =
                        mlx5_create_auto_grouped_flow_table(priv->fs.ns,
@@ -146,6 +161,10 @@ err_add_rule:
                priv->fs.tc.t = NULL;
        }
 err_create_ft:
+       if (attr->action & MLX5_FLOW_CONTEXT_ACTION_MOD_HDR)
+               mlx5_modify_header_dealloc(priv->mdev,
+                                          attr->mod_hdr_id);
+err_create_mod_hdr_id:
        mlx5_fc_destroy(dev, counter);
 
        return rule;
@@ -164,6 +183,10 @@ static void mlx5e_tc_del_nic_flow(struct mlx5e_priv *priv,
                mlx5_destroy_flow_table(priv->fs.tc.t);
                priv->fs.tc.t = NULL;
        }
+
+       if (flow->nic_attr->action & MLX5_FLOW_CONTEXT_ACTION_MOD_HDR)
+               mlx5_modify_header_dealloc(priv->mdev,
+                                          flow->nic_attr->mod_hdr_id);
 }
 
 static void mlx5e_detach_encap(struct mlx5e_priv *priv,
@@ -955,6 +978,7 @@ static int parse_tc_nic_actions(struct mlx5e_priv *priv, struct tcf_exts *exts,
        struct mlx5_nic_flow_attr *attr = flow->nic_attr;
        const struct tc_action *a;
        LIST_HEAD(actions);
+       int err;
 
        if (tc_no_actions(exts))
                return -EINVAL;
@@ -976,6 +1000,17 @@ static int parse_tc_nic_actions(struct mlx5e_priv *priv, struct tcf_exts *exts,
                        continue;
                }
 
+               if (is_tcf_pedit(a)) {
+                       err = parse_tc_pedit_action(priv, a, MLX5_FLOW_NAMESPACE_KERNEL,
+                                                   parse_attr);
+                       if (err)
+                               return err;
+
+                       attr->action |= MLX5_FLOW_CONTEXT_ACTION_MOD_HDR |
+                                       MLX5_FLOW_CONTEXT_ACTION_FWD_DEST;
+                       continue;
+               }
+
                if (is_tcf_skbedit_mark(a)) {
                        u32 mark = tcf_skbedit_mark(a);