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net: dsa: prepare master receive hot path

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In preparation to make DSA master devices point to their corresponding
CPU port instead of the whole tree, add copies of dst and rcv in the
dsa_port structure so that we keep fast access in the receive hot path.

Also keep the copies at the beginning of the dsa_port structure in order
to ensure they are available in cacheline 1.

Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vivien Didelot 2017-09-29 17:19:19 -04:00 committed by David S. Miller
parent 152402483e
commit 3e41f93b35
3 changed files with 13 additions and 0 deletions
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5
include/net/dsa.h
View file

@ -178,6 +178,11 @@ struct dsa_port {
/* CPU port tagging operations used by master or slave devices */
const struct dsa_device_ops *tag_ops;
/* Copies for faster access in master receive hot path */
struct dsa_switch_tree *dst;
struct sk_buff *(*rcv)(struct sk_buff *skb, struct net_device *dev,
struct packet_type *pt);
struct dsa_switch *ds;
unsigned int index;
const char *name;

4
net/dsa/dsa2.c
View file

@ -524,7 +524,11 @@ static int dsa_cpu_parse(struct dsa_port *port, u32 index,
dst->cpu_dp->tag_ops = tag_ops;
dst->tag_ops = tag_ops;
/* Make a few copies for faster access in master receive hot path */
dst->cpu_dp->rcv = dst->cpu_dp->tag_ops->rcv;
dst->rcv = dst->tag_ops->rcv;
dst->cpu_dp->dst = dst;
return 0;
}

4
net/dsa/legacy.c
View file

@ -154,7 +154,11 @@ static int dsa_switch_setup_one(struct dsa_switch *ds,
dst->cpu_dp->tag_ops = tag_ops;
dst->tag_ops = tag_ops;
/* Few copies for faster access in master receive hot path */
dst->cpu_dp->rcv = dst->cpu_dp->tag_ops->rcv;
dst->rcv = dst->tag_ops->rcv;
dst->cpu_dp->dst = dst;
}
memcpy(ds->rtable, cd->rtable, sizeof(ds->rtable));