Commit 3d97379a authored by Eric Dumazet's avatar Eric Dumazet Committed by David S. Miller
Browse files

tcp: move sk_mark_napi_id() at the right place 



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: default avatarEric Dumazet <edumazet@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 2e1af7d7

net/ipv4/tcp_ipv4.c

+2 −1
Original line number Diff line number Diff line
@@ -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);

net/ipv6/tcp_ipv6.c

+2 −1
Original line number Diff line number Diff line
@@ -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);

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