netdev - [RFC PATCH v2 19/45] tcp: Export low-level TCP functions

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Date:   Wed,  2 Oct 2019 16:36:29 -0700
From:   Mat Martineau <mathew.j.martineau@...ux.intel.com>
To:     netdev@...r.kernel.org, edumazet@...gle.com
Cc:     Mat Martineau <mathew.j.martineau@...ux.intel.com>,
        cpaasch@...le.com, fw@...len.de, pabeni@...hat.com,
        peter.krystad@...ux.intel.com, dcaratti@...hat.com,
        matthieu.baerts@...sares.net
Subject: [RFC PATCH v2 19/45] tcp: Export low-level TCP functions

MPTCP will make use of tcp_send_mss() and tcp_push() when sending
data to specific TCP subflows.

Signed-off-by: Mat Martineau <mathew.j.martineau@...ux.intel.com>
---
 include/net/tcp.h | 3 +++
 net/ipv4/tcp.c    | 6 +++---
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/include/net/tcp.h b/include/net/tcp.h
index ddc098b33999..3994e6b0db27 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -330,6 +330,9 @@ int tcp_sendpage_locked(struct sock *sk, struct page *page, int offset,
 			size_t size, int flags);
 ssize_t do_tcp_sendpages(struct sock *sk, struct page *page, int offset,
 		 size_t size, int flags);
+int tcp_send_mss(struct sock *sk, int *size_goal, int flags);
+void tcp_push(struct sock *sk, int flags, int mss_now, int nonagle,
+	      int size_goal);
 void tcp_release_cb(struct sock *sk);
 void tcp_wfree(struct sk_buff *skb);
 void tcp_write_timer_handler(struct sock *sk);
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 5893d08cb204..5450e91dd82c 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -691,8 +691,8 @@ static bool tcp_should_autocork(struct sock *sk, struct sk_buff *skb,
 	       refcount_read(&sk->sk_wmem_alloc) > skb->truesize;
 }
 
-static void tcp_push(struct sock *sk, int flags, int mss_now,
-		     int nonagle, int size_goal)
+void tcp_push(struct sock *sk, int flags, int mss_now,
+	      int nonagle, int size_goal)
 {
 	struct tcp_sock *tp = tcp_sk(sk);
 	struct sk_buff *skb;
@@ -926,7 +926,7 @@ static unsigned int tcp_xmit_size_goal(struct sock *sk, u32 mss_now,
 	return max(size_goal, mss_now);
 }
 
-static int tcp_send_mss(struct sock *sk, int *size_goal, int flags)
+int tcp_send_mss(struct sock *sk, int *size_goal, int flags)
 {
 	int mss_now;
 
-- 
2.23.0