netdev - [PATCH net-next 3/6] tcp: export tcp_splice

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Message-Id: <20260129-net-next-mptcp-splice-v1-3-994cac40daa0@kernel.org>
Date: Thu, 29 Jan 2026 20:23:36 +0100
From: "Matthieu Baerts (NGI0)" <matttbe@...nel.org>
To: Mat Martineau <martineau@...nel.org>, Geliang Tang <geliang@...nel.org>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
 Simon Horman <horms@...nel.org>, Neal Cardwell <ncardwell@...gle.com>, 
 Kuniyuki Iwashima <kuniyu@...gle.com>, David Ahern <dsahern@...nel.org>, 
 Shuah Khan <shuah@...nel.org>
Cc: netdev@...r.kernel.org, mptcp@...ts.linux.dev, 
 linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org, 
 "Matthieu Baerts (NGI0)" <matttbe@...nel.org>, 
 Geliang Tang <geliang@...nel.org>
Subject: [PATCH net-next 3/6] tcp: export tcp_splice_state

From: Geliang Tang <tanggeliang@...inos.cn>

Export struct tcp_splice_state and tcp_splice_data_recv() in net/tcp.h
so that they can be used by MPTCP in the next patch.

Suggested-by: Paolo Abeni <pabeni@...hat.com>
Signed-off-by: Geliang Tang <tanggeliang@...inos.cn>
Acked-by: Mat Martineau <martineau@...nel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@...nel.org>
---
 include/net/tcp.h | 11 +++++++++++
 net/ipv4/tcp.c    | 13 ++-----------
 2 files changed, 13 insertions(+), 11 deletions(-)

diff --git a/include/net/tcp.h b/include/net/tcp.h
index f1cf9e6730c8..cecec1a92d5e 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -347,6 +347,15 @@ extern struct proto tcp_prot;
 #define TCP_DEC_STATS(net, field)	SNMP_DEC_STATS((net)->mib.tcp_statistics, field)
 #define TCP_ADD_STATS(net, field, val)	SNMP_ADD_STATS((net)->mib.tcp_statistics, field, val)
 
+/*
+ * TCP splice context
+ */
+struct tcp_splice_state {
+	struct pipe_inode_info *pipe;
+	size_t len;
+	unsigned int flags;
+};
+
 void tcp_tsq_work_init(void);
 
 int tcp_v4_err(struct sk_buff *skb, u32);
@@ -378,6 +387,8 @@ void tcp_rcv_space_adjust(struct sock *sk);
 int tcp_twsk_unique(struct sock *sk, struct sock *sktw, void *twp);
 void tcp_twsk_destructor(struct sock *sk);
 void tcp_twsk_purge(struct list_head *net_exit_list);
+int tcp_splice_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb,
+			 unsigned int offset, size_t len);
 ssize_t tcp_splice_read(struct socket *sk, loff_t *ppos,
 			struct pipe_inode_info *pipe, size_t len,
 			unsigned int flags);
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index e4009158b908..6e94c5859f4b 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -318,15 +318,6 @@ EXPORT_SYMBOL(tcp_have_smc);
 struct percpu_counter tcp_sockets_allocated ____cacheline_aligned_in_smp;
 EXPORT_IPV6_MOD(tcp_sockets_allocated);
 
-/*
- * TCP splice context
- */
-struct tcp_splice_state {
-	struct pipe_inode_info *pipe;
-	size_t len;
-	unsigned int flags;
-};
-
 /*
  * Pressure flag: try to collapse.
  * Technical note: it is used by multiple contexts non atomically.
@@ -791,8 +782,8 @@ void tcp_push(struct sock *sk, int flags, int mss_now,
 	__tcp_push_pending_frames(sk, mss_now, nonagle);
 }
 
-static int tcp_splice_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb,
-				unsigned int offset, size_t len)
+int tcp_splice_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb,
+			 unsigned int offset, size_t len)
 {
 	struct tcp_splice_state *tss = rd_desc->arg.data;
 	int ret;

-- 
2.51.0