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net: use indirect call wrappers at GRO transport layer

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This avoids an indirect call in the receive path for TCP and UDP
packets. TCP takes precedence on UDP, so that we have a single
additional conditional in the common case.

When IPV6 is build as module, all gro symbols except UDPv6 are
builtin, while the latter belong to the ipv6 module, so we
need some special care.

v1 -> v2:
 - adapted to INDIRECT_CALL_ changes
v2 -> v3:
 - fix build issue with CONFIG_IPV6=m

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paolo Abeni
2018-12-14 11:51:59 +01:00
committed by David S. Miller
parent aaa5d90b39
commit 028e0a4766
7 changed files with 61 additions and 15 deletions
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13
net/ipv4/af_inet.c
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@@ -1385,6 +1385,10 @@ out:
}
EXPORT_SYMBOL(inet_gso_segment);
INDIRECT_CALLABLE_DECLARE(struct sk_buff *tcp4_gro_receive(struct list_head *,
struct sk_buff *));
INDIRECT_CALLABLE_DECLARE(struct sk_buff *udp4_gro_receive(struct list_head *,
struct sk_buff *));
struct sk_buff *inet_gro_receive(struct list_head *head, struct sk_buff *skb)
{
const struct net_offload *ops;
@@ -1494,7 +1498,8 @@ struct sk_buff *inet_gro_receive(struct list_head *head, struct sk_buff *skb)
skb_gro_pull(skb, sizeof(*iph));
skb_set_transport_header(skb, skb_gro_offset(skb));
pp = call_gro_receive(ops->callbacks.gro_receive, head, skb);
pp = indirect_call_gro_receive(tcp4_gro_receive, udp4_gro_receive,
ops->callbacks.gro_receive, head, skb);
out_unlock:
rcu_read_unlock();
@@ -1556,6 +1561,8 @@ int inet_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
return -EINVAL;
}
INDIRECT_CALLABLE_DECLARE(int tcp4_gro_complete(struct sk_buff *, int));
INDIRECT_CALLABLE_DECLARE(int udp4_gro_complete(struct sk_buff *, int));
int inet_gro_complete(struct sk_buff *skb, int nhoff)
{
__be16 newlen = htons(skb->len - nhoff);
@@ -1581,7 +1588,9 @@ int inet_gro_complete(struct sk_buff *skb, int nhoff)
* because any hdr with option will have been flushed in
* inet_gro_receive().
*/
err = ops->callbacks.gro_complete(skb, nhoff + sizeof(*iph));
err = INDIRECT_CALL_2(ops->callbacks.gro_complete,
tcp4_gro_complete, udp4_gro_complete,
skb, nhoff + sizeof(*iph));
out_unlock:
rcu_read_unlock();