net: Update RFS target at poll for tcp/udp (c3f1dbaf) · Commits · 戴 / test

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>

net/ipv4/tcp.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -436,6 +436,8 @@ unsigned int tcp_poll(struct file file, struct socket sock, poll_table *wait)
		struct sock *sk = sock->sk;
		const struct tcp_sock *tp = tcp_sk(sk);

		sock_rps_record_flow(sk);

		sock_poll_wait(file, sk_sleep(sk), wait);
		if (sk->sk_state == TCP_LISTEN)
		return inet_csk_listen_poll(sk);

net/ipv4/udp.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -1967,6 +1967,8 @@ unsigned int udp_poll(struct file file, struct socket sock, poll_table *wait)
		unsigned int mask = datagram_poll(file, sock, wait);
		struct sock *sk = sock->sk;

		sock_rps_record_flow(sk);

		/* Check for false positives due to checksum errors */
		if ((mask & POLLRDNORM) && !(file->f_flags & O_NONBLOCK) &&
		!(sk->sk_shutdown & RCV_SHUTDOWN) && !first_packet_length(sk))

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