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net: Update RFS target at poll for tcp/udp
The current state of affairs is that read()/write() will setup RFS (Receive Flow Steering) for internet protocol sockets while poll()/epoll() does not. When poll() gets called with a TCP or UDP socket, we should update the flow target. This permits to RFS (if enabled) to select the appropriate CPU for following incoming packets. Note: Only connected UDP sockets can benefit from RFS. Signed-off-by: David Majnemer <majnemer@google.com> Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Paul Turner <pjt@google.com> Cc: Tom Herbert <therbert@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -436,6 +436,8 @@ unsigned int tcp_poll(struct file *file, struct socket *sock, poll_table *wait)
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struct sock *sk = sock->sk;
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const struct tcp_sock *tp = tcp_sk(sk);
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sock_rps_record_flow(sk);
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sock_poll_wait(file, sk_sleep(sk), wait);
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if (sk->sk_state == TCP_LISTEN)
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return inet_csk_listen_poll(sk);
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@ -1967,6 +1967,8 @@ unsigned int udp_poll(struct file *file, struct socket *sock, poll_table *wait)
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unsigned int mask = datagram_poll(file, sock, wait);
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struct sock *sk = sock->sk;
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sock_rps_record_flow(sk);
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/* Check for false positives due to checksum errors */
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if ((mask & POLLRDNORM) && !(file->f_flags & O_NONBLOCK) &&
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!(sk->sk_shutdown & RCV_SHUTDOWN) && !first_packet_length(sk))
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