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tcp: move sk_mark_napi_id() at the right place

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sk_mark_napi_id() is used to record for a flow napi id of incoming
packets for busypoll sake.
We should do this only on established flows, not on listeners.

This was 'working' by virtue of the socket cloning, but doing
this on SYN packets in unecessary cache line dirtying.

Even if we move sk_napi_id in the same cache line than sk_lock,
we are working to make SYN processing lockless, so it is desirable
to set sk_napi_id only for established flows.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2014-11-11 05:54:27 -08:00 committed by David S. Miller
parent 2e1af7d74f
commit 3d97379a67
2 changed files with 4 additions and 2 deletions
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3
net/ipv4/tcp_ipv4.c
View File

@ -1429,6 +1429,7 @@ int tcp_v4_do_rcv(struct sock *sk, struct sk_buff *skb)
struct dst_entry *dst = sk->sk_rx_dst;
sock_rps_save_rxhash(sk, skb);
sk_mark_napi_id(sk, skb);
if (dst) {
if (inet_sk(sk)->rx_dst_ifindex != skb->skb_iif ||
dst->ops->check(dst, 0) == NULL) {
@ -1450,6 +1451,7 @@ int tcp_v4_do_rcv(struct sock *sk, struct sk_buff *skb)
if (nsk != sk) {
sock_rps_save_rxhash(nsk, skb);
sk_mark_napi_id(sk, skb);
if (tcp_child_process(sk, nsk, skb)) {
rsk = nsk;
goto reset;
@ -1661,7 +1663,6 @@ process:
if (sk_filter(sk, skb))
goto discard_and_relse;
sk_mark_napi_id(sk, skb);
skb->dev = NULL;
bh_lock_sock_nested(sk);

3
net/ipv6/tcp_ipv6.c
View File

@ -1293,6 +1293,7 @@ static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
struct dst_entry *dst = sk->sk_rx_dst;
sock_rps_save_rxhash(sk, skb);
sk_mark_napi_id(sk, skb);
if (dst) {
if (inet_sk(sk)->rx_dst_ifindex != skb->skb_iif ||
dst->ops->check(dst, np->rx_dst_cookie) == NULL) {
@ -1322,6 +1323,7 @@ static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
*/
if (nsk != sk) {
sock_rps_save_rxhash(nsk, skb);
sk_mark_napi_id(sk, skb);
if (tcp_child_process(sk, nsk, skb))
goto reset;
if (opt_skb)
@ -1454,7 +1456,6 @@ process:
if (sk_filter(sk, skb))
goto discard_and_relse;
sk_mark_napi_id(sk, skb);
skb->dev = NULL;
bh_lock_sock_nested(sk);