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Subject[PATCH net-next v2 1/6] net: dsa: comment hot path requirements
Date
The DSA layer uses inline helpers and copies of the tagging functions
for faster access in hot path. Add comments to detail that.

Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
---
include/net/dsa.h | 3 +++
net/dsa/dsa_priv.h | 1 +
2 files changed, 4 insertions(+)

diff --git a/include/net/dsa.h b/include/net/dsa.h
index c0e567c0c824..58297e4c6b31 100644
--- a/include/net/dsa.h
+++ b/include/net/dsa.h
@@ -126,6 +126,8 @@ 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,
@@ -464,6 +466,7 @@ 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;
diff --git a/net/dsa/dsa_priv.h b/net/dsa/dsa_priv.h
index c1d4180651af..2ce9fec9eec5 100644
--- a/net/dsa/dsa_priv.h
+++ b/net/dsa/dsa_priv.h
@@ -73,6 +73,7 @@ struct dsa_device_ops {
};

struct dsa_slave_priv {
+ /* Copy of dp->ds->dst->tag_ops->xmit for faster access in hot path */
struct sk_buff * (*xmit)(struct sk_buff *skb,
struct net_device *dev);

--
2.13.0
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