net/mlx5e: TC, Handle sampled packets

Mark the sampled packets with a sample restore object. Send sampled
packets using the psample api.

Signed-off-by: Chris Mi <cmi@nvidia.com>
Reviewed-by: Oz Shlomo <ozsh@nvidia.com>
Reviewed-by: Mark Bloch <mbloch@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

drivers/net/ethernet/mellanox/mlx5/core/en/rep/tc.c

@@ -17,6 +17,7 @@
 #include "en/mapping.h"
 #include "en/tc_tun.h"
 #include "lib/port_tun.h"
+#include "esw/sample.h"
 
 struct mlx5e_rep_indr_block_priv {
 	struct net_device *netdev;
@@ -675,13 +676,20 @@ bool mlx5e_rep_tc_update_skb(struct mlx5_cqe64 *cqe,
 	}
 
 #if IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
-	if (mapped_obj.type == MLX5_MAPPED_OBJ_CHAIN) {
+	if (mapped_obj.type == MLX5_MAPPED_OBJ_CHAIN)
 		return mlx5e_restore_skb(skb, mapped_obj.chain, reg_c1, tc_priv);
-	} else {
+#endif /* CONFIG_NET_TC_SKB_EXT */
+#if IS_ENABLED(CONFIG_MLX5_TC_SAMPLE)
+	if (mapped_obj.type == MLX5_MAPPED_OBJ_SAMPLE) {
+		mlx5_esw_sample_skb(skb, &mapped_obj);
+		return false;
+	}
+#endif /* CONFIG_MLX5_TC_SAMPLE */
+	if (mapped_obj.type != MLX5_MAPPED_OBJ_SAMPLE &&
+	    mapped_obj.type != MLX5_MAPPED_OBJ_CHAIN) {
 		netdev_dbg(priv->netdev, "Invalid mapped object type: %d\n", mapped_obj.type);
 		return false;
 	}
-#endif /* CONFIG_NET_TC_SKB_EXT */
 
 	return true;
 }

drivers/net/ethernet/mellanox/mlx5/core/esw/sample.c

@@ -298,6 +298,21 @@ sample_restore_put(struct mlx5_esw_psample *esw_psample, struct mlx5_sample_rest
 	}
 }
 
+void mlx5_esw_sample_skb(struct sk_buff *skb, struct mlx5_mapped_obj *mapped_obj)
+{
+	u32 trunc_size = mapped_obj->sample.trunc_size;
+	struct psample_group psample_group = {};
+	struct psample_metadata md = {};
+
+	md.trunc_size = trunc_size ? min(trunc_size, skb->len) : skb->len;
+	md.in_ifindex = skb->dev->ifindex;
+	psample_group.group_num = mapped_obj->sample.group_id;
+	psample_group.net = &init_net;
+	skb_push(skb, skb->mac_len);
+
+	psample_sample_packet(&psample_group, skb, mapped_obj->sample.rate, &md);
+}
+
 struct mlx5_esw_psample *
 mlx5_esw_sample_init(struct mlx5e_priv *priv)
 {

drivers/net/ethernet/mellanox/mlx5/core/esw/sample.h

@@ -5,6 +5,7 @@
 #define __MLX5_EN_TC_SAMPLE_H__
 
 #include "en.h"
+#include "eswitch.h"
 
 struct mlx5_sample_attr {
 	u32 group_num;
@@ -12,6 +13,8 @@ struct mlx5_sample_attr {
 	u32 trunc_size;
 };
 
+void mlx5_esw_sample_skb(struct sk_buff *skb, struct mlx5_mapped_obj *mapped_obj);
+
 struct mlx5_esw_psample *
 mlx5_esw_sample_init(struct mlx5e_priv *priv);
 

drivers/net/ethernet/mellanox/mlx5/core/eswitch.h

@@ -50,12 +50,18 @@
 
 enum mlx5_mapped_obj_type {
 	MLX5_MAPPED_OBJ_CHAIN,
+	MLX5_MAPPED_OBJ_SAMPLE,
 };
 
 struct mlx5_mapped_obj {
 	enum mlx5_mapped_obj_type type;
 	union {
 		u32 chain;
+		struct {
+			u32 group_id;
+			u32 rate;
+			u32 trunc_size;
+		} sample;
 	};
 };