vxlan: Expose helper vxlan_build_gbp_hdr

The function vxlan_build_gbp_hdr will be used by other modules to build
gbp option in vxlan header according to gbp flags.

Signed-off-by: Gavin Li <[e-mail]>
Reviewed-by: Gavi Teitz <[e-mail]>
Reviewed-by: Roi Dayan <[e-mail]>
Reviewed-by: Maor Dickman <[e-mail]>
Acked-by: Saeed Mahameed <[e-mail]>
Reviewed-by: Simon Horman <[e-mail]>
Signed-off-by: Jakub Kicinski <[e-mail]>

drivers/net/vxlan/vxlan_core.c

···
 	return false;
 }
 
-static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, struct vxlan_metadata *md)
-{
-	struct vxlanhdr_gbp *gbp;
-
-	if (!md->gbp)
-		return;
-
-	gbp = (struct vxlanhdr_gbp *)vxh;
-	vxh->vx_flags |= VXLAN_HF_GBP;
-
-	if (md->gbp & VXLAN_GBP_DONT_LEARN)
-		gbp->dont_learn = 1;
-
-	if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
-		gbp->policy_applied = 1;
-
-	gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
-}
-
 static int vxlan_build_gpe_hdr(struct vxlanhdr *vxh, __be16 protocol)
 {
 	struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)vxh;

include/net/vxlan.h

···
 	return true;
 }
 
+static inline void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, const struct vxlan_metadata *md)
+{
+	struct vxlanhdr_gbp *gbp;
+
+	if (!md->gbp)
+		return;
+
+	gbp = (struct vxlanhdr_gbp *)vxh;
+	vxh->vx_flags |= VXLAN_HF_GBP;
+
+	if (md->gbp & VXLAN_GBP_DONT_LEARN)
+		gbp->dont_learn = 1;
+
+	if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
+		gbp->policy_applied = 1;
+
+	gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
+}
+
 #endif