[PATCH RFC net-next 09/19] net: dsa: tag_gswip: split out common tag accessors

[Alexander Lobakin <alobakin@dlink.ru>]

...to reuse them in GRO callbacks.

Signed-off-by: Alexander Lobakin <alobakin@dlink.ru>
---
 net/dsa/tag_gswip.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/net/dsa/tag_gswip.c b/net/dsa/tag_gswip.c
index d37289540ef3..e7b36de27fd8 100644
--- a/net/dsa/tag_gswip.c
+++ b/net/dsa/tag_gswip.c
@@ -55,6 +55,16 @@
 /* Byte 7 */
 #define GSWIP_RX_SPPID(byte_7)		FIELD_GET(GENMASK(6, 4), byte_7)
 
+static inline int gswip_tag_source_port(const u8 *data)
+{
+	return GSWIP_RX_SPPID(*(data - ETH_HLEN + 7));
+}
+
+static inline __be16 gswip_tag_encap_proto(const u8 *data)
+{
+	return *(__be16 *)(data + 6);
+}
+
 static struct sk_buff *gswip_tag_xmit(struct sk_buff *skb,
 				      struct net_device *dev)
 {
@@ -85,7 +95,7 @@ static struct sk_buff *gswip_tag_rcv(struct sk_buff *skb,
 		return NULL;
 
 	/* Get source port information */
-	port = GSWIP_RX_SPPID(*(skb->data - ETH_HLEN + 7));
+	port = gswip_tag_source_port(skb->data);
 
 	skb->dev = dsa_master_find_slave(dev, 0, port);
 	if (!skb->dev)
@@ -101,7 +111,7 @@ static void gswip_tag_flow_dissect(const struct sk_buff *skb, __be16 *proto,
 				   int *offset)
 {
 	*offset = GSWIP_RX_HEADER_LEN;
-	*proto = *(__be16 *)(skb->data + 6);
+	*proto = gswip_tag_encap_proto(skb->data);
 }
 
 static const struct dsa_device_ops gswip_netdev_ops = {
-- 
2.24.1