From a5b50476f77a8fcc8055c955720d05a7c2d9c532 Mon Sep 17 00:00:00 2001 From: Eliezer Tamir Date: Mon, 10 Jun 2013 11:40:00 +0300 Subject: udp: add low latency socket poll support Add upport for busy-polling on UDP sockets. In __udp[46]_lib_rcv add a call to sk_mark_ll() to copy the napi_id from the skb into the sk. This is done at the earliest possible moment, right after we identify which socket this skb is for. In __skb_recv_datagram When there is no data and the user tries to read we busy poll. Signed-off-by: Alexander Duyck Signed-off-by: Jesse Brandeburg Signed-off-by: Eliezer Tamir Acked-by: Eric Dumazet Tested-by: Willem de Bruijn Signed-off-by: David S. Miller --- net/ipv4/udp.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) (limited to 'net/ipv4/udp.c') diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c index c7338ec..2955b25 100644 --- a/net/ipv4/udp.c +++ b/net/ipv4/udp.c @@ -109,6 +109,7 @@ #include #include #include +#include #include "udp_impl.h" struct udp_table udp_table __read_mostly; @@ -1709,7 +1710,10 @@ int __udp4_lib_rcv(struct sk_buff *skb, struct udp_table *udptable, sk = __udp4_lib_lookup_skb(skb, uh->source, uh->dest, udptable); if (sk != NULL) { - int ret = udp_queue_rcv_skb(sk, skb); + int ret; + + sk_mark_ll(sk, skb); + ret = udp_queue_rcv_skb(sk, skb); sock_put(sk); /* a return value > 0 means to resubmit the input, but -- cgit v1.1