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tcp: add low latency socket poll support.

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Adds low latency socket poll support for TCP.
In tcp_v[46]_rcv() add a call to sk_mark_ll() to copy the napi_id
from the skb to the sk.
In tcp_recvmsg(), when there is no data in the socket we busy-poll.
This is a good example of how to add busy-poll support to more protocols.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: Eliezer Tamir <eliezer.tamir@linux.intel.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Tested-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eliezer Tamir 2013-06-10 11:40:10 +03:00 committed by David S. Miller
parent a5b50476f7
commit d30e383bb8
3 changed files with 9 additions and 0 deletions
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5
net/ipv4/tcp.c
View file

@ -279,6 +279,7 @@
#include <asm/uaccess.h>
#include <asm/ioctls.h>
#include <net/ll_poll.h>
int sysctl_tcp_fin_timeout __read_mostly = TCP_FIN_TIMEOUT;
@ -1553,6 +1554,10 @@ int tcp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
struct sk_buff *skb;
u32 urg_hole = 0;
if (sk_valid_ll(sk) && skb_queue_empty(&sk->sk_receive_queue)
&& (sk->sk_state == TCP_ESTABLISHED))
sk_poll_ll(sk, nonblock);
lock_sock(sk);
err = -ENOTCONN;

2
net/ipv4/tcp_ipv4.c
View file

@ -75,6 +75,7 @@
#include <net/netdma.h>
#include <net/secure_seq.h>
#include <net/tcp_memcontrol.h>
#include <net/ll_poll.h>
#include <linux/inet.h>
#include <linux/ipv6.h>
@ -1993,6 +1994,7 @@ process:
if (sk_filter(sk, skb))
goto discard_and_relse;
sk_mark_ll(sk, skb);
skb->dev = NULL;
bh_lock_sock_nested(sk);

2
net/ipv6/tcp_ipv6.c
View file

@ -63,6 +63,7 @@
#include <net/inet_common.h>
#include <net/secure_seq.h>
#include <net/tcp_memcontrol.h>
#include <net/ll_poll.h>
#include <asm/uaccess.h>
@ -1498,6 +1499,7 @@ process:
if (sk_filter(sk, skb))
goto discard_and_relse;
sk_mark_ll(sk, skb);
skb->dev = NULL;
bh_lock_sock_nested(sk);