[PATCH net-next v2 1/6] mptcp: add eat_recv_skb helper

["Matthieu Baerts (NGI0)" <matttbe@kernel.org>]

From: Geliang Tang <tanggeliang@kylinos.cn>

This patch extracts the free skb related code in __mptcp_recvmsg_mskq()
into a new helper mptcp_eat_recv_skb().

This new helper will be used in the next patch.

Signed-off-by: Geliang Tang <tanggeliang@kylinos.cn>
Reviewed-by: Mat Martineau <martineau@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
---
 net/mptcp/protocol.c | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index 8d3233667418..5eb2a6182d4b 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -1995,6 +1995,17 @@ static int mptcp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
 
 static void mptcp_rcv_space_adjust(struct mptcp_sock *msk, int copied);
 
+static void mptcp_eat_recv_skb(struct sock *sk, struct sk_buff *skb)
+{
+	/* avoid the indirect call, we know the destructor is sock_rfree */
+	skb->destructor = NULL;
+	skb->sk = NULL;
+	atomic_sub(skb->truesize, &sk->sk_rmem_alloc);
+	sk_mem_uncharge(sk, skb->truesize);
+	__skb_unlink(skb, &sk->sk_receive_queue);
+	skb_attempt_defer_free(skb);
+}
+
 static int __mptcp_recvmsg_mskq(struct sock *sk, struct msghdr *msg,
 				size_t len, int flags, int copied_total,
 				struct scm_timestamping_internal *tss,
@@ -2049,13 +2060,7 @@ static int __mptcp_recvmsg_mskq(struct sock *sk, struct msghdr *msg,
 				break;
 			}
 
-			/* avoid the indirect call, we know the destructor is sock_rfree */
-			skb->destructor = NULL;
-			skb->sk = NULL;
-			atomic_sub(skb->truesize, &sk->sk_rmem_alloc);
-			sk_mem_uncharge(sk, skb->truesize);
-			__skb_unlink(skb, &sk->sk_receive_queue);
-			skb_attempt_defer_free(skb);
+			mptcp_eat_recv_skb(sk, skb);
 		}
 
 		if (copied >= len)

-- 
2.51.0