devlink: Add IPv4 header for dpipe

This will be used by the IPv4 host table which will be introduced in the
following patches. This header is global and can be reused by many
drivers.

Signed-off-by: Arkadi Sharshevsky <arkadis@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/devlink.h

@@ -329,6 +329,7 @@ int devlink_dpipe_action_put(struct sk_buff *skb,
 int devlink_dpipe_match_put(struct sk_buff *skb,
 			    struct devlink_dpipe_match *match);
 extern struct devlink_dpipe_header devlink_dpipe_header_ethernet;
+extern struct devlink_dpipe_header devlink_dpipe_header_ipv4;
 
 #else
 

include/uapi/linux/devlink.h

@@ -230,8 +230,13 @@ enum devlink_dpipe_field_ethernet_id {
 	DEVLINK_DPIPE_FIELD_ETHERNET_DST_MAC,
 };
 
+enum devlink_dpipe_field_ipv4_id {
+	DEVLINK_DPIPE_FIELD_IPV4_DST_IP,
+};
+
 enum devlink_dpipe_header_id {
 	DEVLINK_DPIPE_HEADER_ETHERNET,
+	DEVLINK_DPIPE_HEADER_IPV4,
 };
 
 #endif /* _UAPI_LINUX_DEVLINK_H_ */

net/core/devlink.c

@@ -46,6 +46,23 @@ struct devlink_dpipe_header devlink_dpipe_header_ethernet = {
 };
 EXPORT_SYMBOL(devlink_dpipe_header_ethernet);
 
+static struct devlink_dpipe_field devlink_dpipe_fields_ipv4[] = {
+	{
+		.name = "destination ip",
+		.id = DEVLINK_DPIPE_FIELD_IPV4_DST_IP,
+		.bitwidth = 32,
+	},
+};
+
+struct devlink_dpipe_header devlink_dpipe_header_ipv4 = {
+	.name = "ipv4",
+	.id = DEVLINK_DPIPE_HEADER_IPV4,
+	.fields = devlink_dpipe_fields_ipv4,
+	.fields_count = ARRAY_SIZE(devlink_dpipe_fields_ipv4),
+	.global = true,
+};
+EXPORT_SYMBOL(devlink_dpipe_header_ipv4);
+
 EXPORT_TRACEPOINT_SYMBOL_GPL(devlink_hwmsg);
 
 static LIST_HEAD(devlink_list);