[PATCH v6 net-next 3/5] tcp: add TCP support for low latency receive poll.
From: Eliezer Tamir <hidden>
Date: 2013-05-29 06:40:22
Also in:
lkml
Subsystem:
networking [general], networking [tcp], the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Neal Cardwell, Linus Torvalds
Adds busy-poll support for TCP. Copy the napi_id from an incomming skb to the sk in tcp_v[46]_rcv(). when there is no data in the socket we busy-poll in tcp_recvmsg(). This is a good example of how to add busy-poll support to new protocols. Signed-off-by: Alexander Duyck <redacted> Signed-off-by: Jesse Brandeburg <redacted> Tested-by: Willem de Bruijn <willemb@google.com> Signed-off-by: Eliezer Tamir <redacted> --- net/ipv4/tcp.c | 5 +++++ net/ipv4/tcp_ipv4.c | 2 ++ net/ipv6/tcp_ipv6.c | 2 ++ 3 files changed, 9 insertions(+), 0 deletions(-)
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index ba4186e..becd105 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c@@ -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;
@@ -1551,6 +1552,10 @@ 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;
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index d20ede0..35fd8bc 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c@@ -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>
@@ -2011,6 +2012,7 @@ process: if (sk_filter(sk, skb)) goto discard_and_relse; + sk_mark_ll(sk, skb); skb->dev = NULL; bh_lock_sock_nested(sk);
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 0a17ed9..5cffa5c 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c@@ -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); ------------------------------------------------------------------------------
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