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udp: add low latency socket poll support

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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 <[email protected]>
Signed-off-by: Jesse Brandeburg <[email protected]>
Signed-off-by: Eliezer Tamir <[email protected]>
Acked-by: Eric Dumazet <[email protected]>
Tested-by: Willem de Bruijn <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Eliezer Tamir 2013-06-10 11:40:00 +03:00 • committed by David S. Miller
commit a5b50476f7
3 changed files with 14 additions and 2 deletions
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6
net/ipv4/udp.c
View file

@ -109,6 +109,7 @@
#include <trace/events/udp.h>
#include <linux/static_key.h>
#include <trace/events/skb.h>
#include <net/ll_poll.h>
#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