net/mlx5: E-Switch, Add API to create send-to-vport rules

Add the API to create send-to-vport e-switch rules of the form

 packet meta-data :: send-queue-number == $SQN and source-vport == 0 --> $VPORT

These rules are to be used for a send-to-vport logic which conceptually bypasses
the "normal" steering rules currently present at the e-switch datapath.

Such rule should apply only for packets that originate in the e-switch manager
vport (0) and are sent for a given SQN which is used by a given VF representor
device, and hence the matching logic.
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -193,6 +193,8 @@ int mlx5_eswitch_get_vport_config(struct mlx5_eswitch *esw,
 int mlx5_eswitch_get_vport_stats(struct mlx5_eswitch *esw,
 				 int vport,
 				 struct ifla_vf_stats *vf_stats);
+struct mlx5_flow_rule *
+mlx5_eswitch_add_send_to_vport_rule(struct mlx5_eswitch *esw, int vport, u32 sqn);
 
 #define MLX5_DEBUG_ESWITCH_MASK BIT(3)
 
@@ -204,5 +206,4 @@ int mlx5_eswitch_get_vport_stats(struct mlx5_eswitch *esw,
 
 #define esw_debug(dev, format, ...)				\
 	mlx5_core_dbg_mask(dev, MLX5_DEBUG_ESWITCH_MASK, format, ##__VA_ARGS__)
-
 #endif /* __MLX5_ESWITCH_H__ */

drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c

@@ -38,6 +38,45 @@
 #include "mlx5_core.h"
 #include "eswitch.h"
 
+struct mlx5_flow_rule *
+mlx5_eswitch_add_send_to_vport_rule(struct mlx5_eswitch *esw, int vport, u32 sqn)
+{
+	struct mlx5_flow_destination dest;
+	struct mlx5_flow_rule *flow_rule;
+	int match_header = MLX5_MATCH_MISC_PARAMETERS;
+	u32 *match_v, *match_c;
+	void *misc;
+
+	match_v = kzalloc(MLX5_ST_SZ_BYTES(fte_match_param), GFP_KERNEL);
+	match_c = kzalloc(MLX5_ST_SZ_BYTES(fte_match_param), GFP_KERNEL);
+	if (!match_v || !match_c) {
+		esw_warn(esw->dev, "FDB: Failed to alloc match parameters\n");
+		flow_rule = ERR_PTR(-ENOMEM);
+		goto out;
+	}
+
+	misc = MLX5_ADDR_OF(fte_match_param, match_v, misc_parameters);
+	MLX5_SET(fte_match_set_misc, misc, source_sqn, sqn);
+	MLX5_SET(fte_match_set_misc, misc, source_port, 0x0); /* source vport is 0 */
+
+	misc = MLX5_ADDR_OF(fte_match_param, match_c, misc_parameters);
+	MLX5_SET_TO_ONES(fte_match_set_misc, misc, source_sqn);
+	MLX5_SET_TO_ONES(fte_match_set_misc, misc, source_port);
+
+	dest.type = MLX5_FLOW_DESTINATION_TYPE_VPORT;
+	dest.vport_num = vport;
+
+	flow_rule = mlx5_add_flow_rule(esw->fdb_table.fdb, match_header, match_c,
+				       match_v, MLX5_FLOW_CONTEXT_ACTION_FWD_DEST,
+				       0, &dest);
+	if (IS_ERR(flow_rule))
+		esw_warn(esw->dev, "FDB: Failed to add send to vport rule err %ld\n", PTR_ERR(flow_rule));
+out:
+	kfree(match_v);
+	kfree(match_c);
+	return flow_rule;
+}
+
 static int esw_add_fdb_miss_rule(struct mlx5_eswitch *esw)
 {
 	struct mlx5_flow_destination dest;