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Commit c3f1dbaf authored by David Majnemer's avatar David Majnemer Committed by David S. Miller
Browse files

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: default avatarDavid Majnemer <majnemer@google.com>
Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
Cc: Paul Turner <pjt@google.com>
Cc: Tom Herbert <therbert@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent aef6de51

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))