[TCP]: Don't set SKB owner in tcp_transmit_skb().

The data itself is already charged to the SKB, doing
the skb_set_owner_w() just generates a lot of noise and
extra atomics we don't really need.

Lmbench improvements on lat_tcp are minimal:

before:
TCP latency using localhost: 23.2701 microseconds
TCP latency using localhost: 23.1994 microseconds
TCP latency using localhost: 23.2257 microseconds

after:
TCP latency using localhost: 22.8380 microseconds
TCP latency using localhost: 22.9465 microseconds
TCP latency using localhost: 22.8462 microseconds

Signed-off-by: David S. Miller <davem@davemloft.net>

8 files changed, 10 insertions, 12 deletions

diff --git a/include/net/inet6_connection_sock.h b/include/net/inet6_connection_sock.h
index f13ddc2543b1..16aa96a6a53b 100644
--- a/include/net/inet6_connection_sock.h
+++ b/include/net/inet6_connection_sock.h
@@ -38,5 +38,5 @@ extern void inet6_csk_reqsk_queue_hash_add(struct sock *sk,
 
 extern void inet6_csk_addr2sockaddr(struct sock *sk, struct sockaddr *uaddr);
 
-extern int inet6_csk_xmit(struct sk_buff *skb, int ipfragok);
+extern int inet6_csk_xmit(struct sk_buff *skb, struct sock *sk, int ipfragok);
 #endif /* _INET6_CONNECTION_SOCK_H */
diff --git a/include/net/inet_connection_sock.h b/include/net/inet_connection_sock.h
index 0bcf9f237e1f..fd3f1d8cdc4a 100644
--- a/include/net/inet_connection_sock.h
+++ b/include/net/inet_connection_sock.h
@@ -36,7 +36,8 @@ struct tcp_congestion_ops;
  * (i.e. things that depend on the address family)
  */
 struct inet_connection_sock_af_ops {
-        int         (*queue_xmit)(struct sk_buff *skb, int ipfragok);
+        int         (*queue_xmit)(struct sk_buff *skb, struct sock *sk,
+                                  int ipfragok);
         void        (*send_check)(struct sock *sk, int len,
                                   struct sk_buff *skb);
         int         (*rebuild_header)(struct sock *sk);
diff --git a/include/net/ip.h b/include/net/ip.h
index b6d95e553401..949fa8683626 100644
--- a/include/net/ip.h
+++ b/include/net/ip.h
@@ -97,7 +97,7 @@ extern int		ip_mc_output(struct sk_buff *skb);
 extern int              ip_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *));
 extern int              ip_do_nat(struct sk_buff *skb);
 extern void             ip_send_check(struct iphdr *ip);
-extern int              ip_queue_xmit(struct sk_buff *skb, int ipfragok);
+extern int              ip_queue_xmit(struct sk_buff *skb, struct sock *sk, int ipfragok);
 extern void             ip_init(void);
 extern int              ip_append_data(struct sock *sk,
                                        int getfrag(void *from, char *to, int offset, int len,
diff --git a/net/dccp/output.c b/net/dccp/output.c
index 7102e3aed4ca..2cc4f4b2a9dd 100644
--- a/net/dccp/output.c
+++ b/net/dccp/output.c
@@ -125,7 +125,7 @@ static int dccp_transmit_skb(struct sock *sk, struct sk_buff *skb)
                 DCCP_INC_STATS(DCCP_MIB_OUTSEGS);
 
                 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
-                err = icsk->icsk_af_ops->queue_xmit(skb, 0);
+                err = icsk->icsk_af_ops->queue_xmit(skb, sk, 0);
                 if (err <= 0)
                         return err;
 
@@ -426,7 +426,7 @@ int dccp_send_reset(struct sock *sk, enum dccp_reset_codes code)
                                                       code);
                 if (skb != NULL) {
                         memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
-                        err = inet_csk(sk)->icsk_af_ops->queue_xmit(skb, 0);
+                        err = inet_csk(sk)->icsk_af_ops->queue_xmit(skb, sk, 0);
                         if (err == NET_XMIT_CN)
                                 err = 0;
                 }
diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
index 23633bf042ba..def32d8d3b06 100644
--- a/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -288,9 +288,8 @@ int ip_output(struct sk_buff *skb)
                             !(IPCB(skb)->flags & IPSKB_REROUTED));
 }
 
-int ip_queue_xmit(struct sk_buff *skb, int ipfragok)
+int ip_queue_xmit(struct sk_buff *skb, struct sock *sk, int ipfragok)
 {
-        struct sock *sk = skb->sk;
         struct inet_sock *inet = inet_sk(sk);
         struct ip_options *opt = inet->opt;
         struct rtable *rt;
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index ca406157724c..f63e99aac2d5 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -426,7 +426,6 @@ static int tcp_transmit_skb(struct sock *sk, struct sk_buff *skb, int clone_it,
 
         th = (struct tcphdr *) skb_push(skb, tcp_header_size);
         skb->h.th = th;
-        skb_set_owner_w(skb, sk);
 
         /* Build TCP header and checksum it. */
         th->source              = inet->sport;
@@ -479,7 +478,7 @@ static int tcp_transmit_skb(struct sock *sk, struct sk_buff *skb, int clone_it,
         if (after(tcb->end_seq, tp->snd_nxt) || tcb->seq == tcb->end_seq)
                 TCP_INC_STATS(TCP_MIB_OUTSEGS);
 
-        err = icsk->icsk_af_ops->queue_xmit(skb, 0);
+        err = icsk->icsk_af_ops->queue_xmit(skb, sk, 0);
         if (likely(err <= 0))
                 return err;
 
diff --git a/net/ipv6/inet6_connection_sock.c b/net/ipv6/inet6_connection_sock.c
index e48fb4c53c4f..c598962eaa40 100644
--- a/net/ipv6/inet6_connection_sock.c
+++ b/net/ipv6/inet6_connection_sock.c
@@ -139,9 +139,8 @@ void inet6_csk_addr2sockaddr(struct sock *sk, struct sockaddr * uaddr)
 
 EXPORT_SYMBOL_GPL(inet6_csk_addr2sockaddr);
 
-int inet6_csk_xmit(struct sk_buff *skb, int ipfragok)
+int inet6_csk_xmit(struct sk_buff *skb, struct sock *sk, int ipfragok)
 {
-        struct sock *sk = skb->sk;
         struct inet_sock *inet = inet_sk(sk);
         struct ipv6_pinfo *np = inet6_sk(sk);
         struct flowi fl;
diff --git a/net/sctp/protocol.c b/net/sctp/protocol.c
index 5b4f82fd98f8..c107d45f6e65 100644
--- a/net/sctp/protocol.c
+++ b/net/sctp/protocol.c
@@ -808,7 +808,7 @@ static inline int sctp_v4_xmit(struct sk_buff *skb,
                           NIPQUAD(((struct rtable *)skb->dst)->rt_dst));
 
         SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS);
-        return ip_queue_xmit(skb, ipfragok);
+        return ip_queue_xmit(skb, skb->sk, ipfragok);
 }
 
 static struct sctp_af sctp_ipv4_specific;