From: Eric Dumazet <eduma...@google.com>
Before recent TCP listener patches, we were updating listener
sk->sk_rxhash before the cloning of master socket.
children sk_rxhash was therefore correct after the normal 3WHS.
But with lockless listener, we no longer dirty/change listener sk_rxhash
as it would be racy.
We need to correctly update the child sk_rxhash, otherwise first data
packet wont hit correct cpu if RFS is used.
Fixes: 079096f103fa ("tcp/dccp: install syn_recv requests into ehash table")
Signed-off-by: Eric Dumazet <eduma...@google.com>
Reported-by: Willem de Bruijn <will...@google.com>
Cc: Tom Herbert <t...@herbertland.com>
---
net/ipv4/syncookies.c | 1 +
net/ipv4/tcp_minisocks.c | 1 +
2 files changed, 2 insertions(+)
diff --git a/net/ipv4/syncookies.c b/net/ipv4/syncookies.c
index 8113c30ccf96..2dbb11331f6c 100644
--- a/net/ipv4/syncookies.c
+++ b/net/ipv4/syncookies.c
@@ -225,6 +225,7 @@ struct sock *tcp_get_cookie_sock(struct sock *sk, struct
sk_buff *skb,
child = icsk->icsk_af_ops->syn_recv_sock(sk, skb, req, dst);
if (child) {
atomic_set(&req->rsk_refcnt, 1);
+ sock_rps_save_rxhash(child, skb);
inet_csk_reqsk_queue_add(sk, req, child);
} else {
reqsk_free(req);
diff --git a/net/ipv4/tcp_minisocks.c b/net/ipv4/tcp_minisocks.c
index 9adf1e2c3170..1079e6ad77fe 100644
--- a/net/ipv4/tcp_minisocks.c
+++ b/net/ipv4/tcp_minisocks.c
@@ -768,6 +768,7 @@ struct sock *tcp_check_req(struct sock *sk, struct sk_buff
*skb,
if (!child)
goto listen_overflow;
+ sock_rps_save_rxhash(child, skb);
tcp_synack_rtt_meas(child, req);
inet_csk_reqsk_queue_drop(sk, req);
inet_csk_reqsk_queue_add(sk, req, child);
--
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