net: dsa: comment hot path requirements
The DSA layer uses inline helpers and copy of the tagging functions for
faster access in hot path. Add comments to detail that.
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/dsa.h b/include/net/dsa.h
index 7de1234..18ca0a9 100644
--- a/include/net/dsa.h
+++ b/include/net/dsa.h
@@ -127,6 +127,8 @@ struct dsa_switch_tree {
* protocol to use.
*/
struct net_device *master_netdev;
+
+ /* Copy of tag_ops->rcv for faster access in hot path */
struct sk_buff * (*rcv)(struct sk_buff *skb,
struct net_device *dev,
struct packet_type *pt,
@@ -465,6 +467,7 @@ struct mii_bus *dsa_host_dev_to_mii_bus(struct device *dev);
struct net_device *dsa_dev_to_net_device(struct device *dev);
+/* Keep inline for faster access in hot path */
static inline bool dsa_uses_tagged_protocol(struct dsa_switch_tree *dst)
{
return dst->rcv != NULL;
