[PATCH 1/2] tcp: Remove unnecessary dst check in tcp_conn_request.

[PATCH 1/2] tcp: Remove unnecessary dst check in tcp_conn_request.

[Tonghao Zhang]

Because we remove the tcp_tw_recycle support in the commit
4396e46187c ('tcp: remove tcp_tw_recycle') and also delete
the code 'af_ops->route_req' for sysctl_tw_recycle in tcp_conn_request.
Now when we call the 'af_ops->route_req', the dist always is
NULL, and we remove the unnecessay check.

Signed-off-by: Tonghao Zhang <xiangxia.m.yue@gmail.com>
---
 net/ipv4/tcp_input.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index d73903fe8c83..7eee2c7ddb7a 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -6132,11 +6132,10 @@ int tcp_conn_request(struct request_sock_ops *rsk_ops,
 
 		isn = af_ops->init_seq(skb);
 	}
-	if (!dst) {
-		dst = af_ops->route_req(sk, &fl, req);
-		if (!dst)
-			goto drop_and_free;
-	}
+
+	dst = af_ops->route_req(sk, &fl, req);
+	if (!dst)
+		goto drop_and_free;
 
 	tcp_ecn_create_request(req, skb, sk, dst);
 
-- 
2.13.4

[PATCH 2/2] tcp: Remove the unused parameter for tcp_try_fastopen.

[Tonghao Zhang]

Signed-off-by: Tonghao Zhang <xiangxia.m.yue@gmail.com>
---
 include/net/tcp.h       | 3 +--
 net/ipv4/tcp_fastopen.c | 6 ++----
 net/ipv4/tcp_input.c    | 2 +-
 3 files changed, 4 insertions(+), 7 deletions(-)

diff --git a/include/net/tcp.h b/include/net/tcp.h
index afdab3781425..a995004ae946 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -1533,8 +1533,7 @@ int tcp_fastopen_reset_cipher(void *key, unsigned int len);
 void tcp_fastopen_add_skb(struct sock *sk, struct sk_buff *skb);
 struct sock *tcp_try_fastopen(struct sock *sk, struct sk_buff *skb,
 			      struct request_sock *req,
-			      struct tcp_fastopen_cookie *foc,
-			      struct dst_entry *dst);
+			      struct tcp_fastopen_cookie *foc);
 void tcp_fastopen_init_key_once(bool publish);
 bool tcp_fastopen_cookie_check(struct sock *sk, u16 *mss,
 			     struct tcp_fastopen_cookie *cookie);
diff --git a/net/ipv4/tcp_fastopen.c b/net/ipv4/tcp_fastopen.c
index ce9c7fef200f..e3c33220c418 100644
--- a/net/ipv4/tcp_fastopen.c
+++ b/net/ipv4/tcp_fastopen.c
@@ -171,7 +171,6 @@ void tcp_fastopen_add_skb(struct sock *sk, struct sk_buff *skb)
 
 static struct sock *tcp_fastopen_create_child(struct sock *sk,
 					      struct sk_buff *skb,
-					      struct dst_entry *dst,
 					      struct request_sock *req)
 {
 	struct tcp_sock *tp;
@@ -278,8 +277,7 @@ static bool tcp_fastopen_queue_check(struct sock *sk)
  */
 struct sock *tcp_try_fastopen(struct sock *sk, struct sk_buff *skb,
 			      struct request_sock *req,
-			      struct tcp_fastopen_cookie *foc,
-			      struct dst_entry *dst)
+			      struct tcp_fastopen_cookie *foc)
 {
 	struct tcp_fastopen_cookie valid_foc = { .len = -1 };
 	bool syn_data = TCP_SKB_CB(skb)->end_seq != TCP_SKB_CB(skb)->seq + 1;
@@ -312,7 +310,7 @@ struct sock *tcp_try_fastopen(struct sock *sk, struct sk_buff *skb,
 		 * data in SYN_RECV state.
 		 */
 fastopen:
-		child = tcp_fastopen_create_child(sk, skb, dst, req);
+		child = tcp_fastopen_create_child(sk, skb, req);
 		if (child) {
 			foc->len = -1;
 			NET_INC_STATS(sock_net(sk),
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 7eee2c7ddb7a..21df0868f206 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -6151,7 +6151,7 @@ int tcp_conn_request(struct request_sock_ops *rsk_ops,
 	tcp_openreq_init_rwin(req, sk, dst);
 	if (!want_cookie) {
 		tcp_reqsk_record_syn(sk, req, skb);
-		fastopen_sk = tcp_try_fastopen(sk, skb, req, &foc, dst);
+		fastopen_sk = tcp_try_fastopen(sk, skb, req, &foc);
 	}
 	if (fastopen_sk) {
 		af_ops->send_synack(fastopen_sk, dst, &fl, req,
-- 
2.13.4

Re: [PATCH 1/2] tcp: Remove unnecessary dst check in tcp_conn_request.

[Eric Dumazet]

On Wed, 2017-08-16 at 06:31 -0700, Tonghao Zhang wrote:
> Because we remove the tcp_tw_recycle support in the commit


> 4396e46187c ('tcp: remove tcp_tw_recycle') and also delete
> the code 'af_ops->route_req' for sysctl_tw_recycle in tcp_conn_request.
> Now when we call the 'af_ops->route_req', the dist always is
> NULL, and we remove the unnecessay check.

Thanks for these patches.

You forgot :

1) a cover letter ( [PATCH next-next 0/2] tcp: ....

2) clearly state which tree you are targeting 
( read Documentation/networking/netdev-FAQ.txt )

3) Also, I would also have removed tcp_peer_is_proven()
since it is also called with dst=NULL

Re: [PATCH 1/2] tcp: Remove unnecessary dst check in tcp_conn_request.

[Tonghao Zhang]

On Wed, Aug 16, 2017 at 10:44 PM, Eric Dumazet <eric.dumazet@gmail.com> wrote:
> On Wed, 2017-08-16 at 06:31 -0700, Tonghao Zhang wrote:
>> Because we remove the tcp_tw_recycle support in the commit
>
>
>> 4396e46187c ('tcp: remove tcp_tw_recycle') and also delete
>> the code 'af_ops->route_req' for sysctl_tw_recycle in tcp_conn_request.
>> Now when we call the 'af_ops->route_req', the dist always is
>> NULL, and we remove the unnecessay check.
>
> Thanks for these patches.
>
> You forgot :
>
> 1) a cover letter ( [PATCH next-next 0/2] tcp: ....
>
> 2) clearly state which tree you are targeting
> ( read Documentation/networking/netdev-FAQ.txt )
Thanks, I do this in v2

> 3) Also, I would also have removed tcp_peer_is_proven()
> since it is also called with dst=NULL
Thanks for your work.

>
>