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>
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@ -127,6 +127,8 @@ struct dsa_switch_tree {
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* protocol to use.
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* protocol to use.
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*/
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*/
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struct net_device *master_netdev;
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struct net_device *master_netdev;
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/* Copy of tag_ops->rcv for faster access in hot path */
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struct sk_buff * (*rcv)(struct sk_buff *skb,
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struct sk_buff * (*rcv)(struct sk_buff *skb,
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struct net_device *dev,
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struct net_device *dev,
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struct packet_type *pt,
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struct packet_type *pt,
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@ -465,6 +467,7 @@ struct mii_bus *dsa_host_dev_to_mii_bus(struct device *dev);
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struct net_device *dsa_dev_to_net_device(struct device *dev);
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struct net_device *dsa_dev_to_net_device(struct device *dev);
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/* Keep inline for faster access in hot path */
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static inline bool dsa_uses_tagged_protocol(struct dsa_switch_tree *dst)
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static inline bool dsa_uses_tagged_protocol(struct dsa_switch_tree *dst)
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{
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{
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return dst->rcv != NULL;
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return dst->rcv != NULL;
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@ -73,6 +73,7 @@ struct dsa_device_ops {
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};
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};
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struct dsa_slave_priv {
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struct dsa_slave_priv {
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/* Copy of dp->ds->dst->tag_ops->xmit for faster access in hot path */
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struct sk_buff * (*xmit)(struct sk_buff *skb,
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struct sk_buff * (*xmit)(struct sk_buff *skb,
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struct net_device *dev);
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struct net_device *dev);
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