Re: [PATCH net-next 1/2] net/smc: refatoring initialization of smc sock

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On 5/10/24 5:50 PM, Dust Li wrote:
On 2024-05-10 12:12:12, D. Wythe wrote:
From: "D. Wythe" <alibuda@xxxxxxxxxxxxxxxxx>

This patch aims to isolate the shared components of SMC socket
allocation by introducing smc_sock_init() for sock initialization
and __smc_create_clcsk() for the initialization of clcsock.

This is in preparation for the subsequent implementation of the
AF_INET version of SMC.

Signed-off-by: D. Wythe <alibuda@xxxxxxxxxxxxxxxxx>
---
net/smc/af_smc.c | 93 +++++++++++++++++++++++++++++++-------------------------
1 file changed, 52 insertions(+), 41 deletions(-)

diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c
index 9389f0c..1f03724 100644
--- a/net/smc/af_smc.c
+++ b/net/smc/af_smc.c
@@ -361,34 +361,43 @@ static void smc_destruct(struct sock *sk)
		return;
}

-static struct sock *smc_sock_alloc(struct net *net, struct socket *sock,
-				   int protocol)
+static void smc_sock_init(struct net *net, struct sock *sk, int protocol)
{
-	struct smc_sock *smc;
-	struct proto *prot;
-	struct sock *sk;
-
-	prot = (protocol == SMCPROTO_SMC6) ? &smc_proto6 : &smc_proto;
-	sk = sk_alloc(net, PF_SMC, GFP_KERNEL, prot, 0);
-	if (!sk)
-		return NULL;
+	struct smc_sock *smc = smc_sk(sk);

-	sock_init_data(sock, sk); /* sets sk_refcnt to 1 */
	sk->sk_state = SMC_INIT;
-	sk->sk_destruct = smc_destruct;
	sk->sk_protocol = protocol;
+	mutex_init(&smc->clcsock_release_lock);
	WRITE_ONCE(sk->sk_sndbuf, 2 * READ_ONCE(net->smc.sysctl_wmem));
	WRITE_ONCE(sk->sk_rcvbuf, 2 * READ_ONCE(net->smc.sysctl_rmem));
-	smc = smc_sk(sk);
	INIT_WORK(&smc->tcp_listen_work, smc_tcp_listen_work);
	INIT_WORK(&smc->connect_work, smc_connect_work);
	INIT_DELAYED_WORK(&smc->conn.tx_work, smc_tx_work);
	INIT_LIST_HEAD(&smc->accept_q);
	spin_lock_init(&smc->accept_q_lock);
	spin_lock_init(&smc->conn.send_lock);
-	sk->sk_prot->hash(sk);
-	mutex_init(&smc->clcsock_release_lock);
	smc_init_saved_callbacks(smc);
+	smc->limit_smc_hs = net->smc.limit_smc_hs;
+	smc->use_fallback = false; /* assume rdma capability first */
+	smc->fallback_rsn = 0;
+
+	sk->sk_destruct = smc_destruct;
+	sk->sk_prot->hash(sk);
Why change the order here ? e.g.

Before:
     sk->sk_destruct = smc_destruct;
     mutex_init(&smc->clcsock_release_lock);
After
     mutex_init(&smc->clcsock_release_lock);
     sk->sk_destruct = smc_destruct;

Same for sk->sk_prot->hash(sk)

Yes, you are right, I will fix it in the next version.


+}
+
+static struct sock *smc_sock_alloc(struct net *net, struct socket *sock,
+				   int protocol)
+{
+	struct proto *prot;
+	struct sock *sk;
+
+	prot = (protocol == SMCPROTO_SMC6) ? &smc_proto6 : &smc_proto;
+	sk = sk_alloc(net, PF_SMC, GFP_KERNEL, prot, 0);
+	if (!sk)
+		return NULL;
+
+	sock_init_data(sock, sk); /* sets sk_refcnt to 1 */
+	smc_sock_init(net, sk, protocol);

	return sk;
}
@@ -3321,6 +3330,31 @@ static ssize_t smc_splice_read(struct socket *sock, loff_t *ppos,
	.splice_read	= smc_splice_read,
};

+static int __smc_create_clcsk(struct net *net, struct sock *sk, int family)
Why add '__' prefix here ?

Good question, I also realize that this is not suitable, I will delete it in the next version.

Thanks.


+{
+	struct smc_sock *smc = smc_sk(sk);
+	int rc;
+
+	rc = sock_create_kern(net, family, SOCK_STREAM, IPPROTO_TCP,
+			      &smc->clcsock);
+	if (rc) {
+		sk_common_release(sk);
+		return rc;
+	}
+
+	/* smc_clcsock_release() does not wait smc->clcsock->sk's
+	 * destruction;  its sk_state might not be TCP_CLOSE after
+	 * smc->sk is close()d, and TCP timers can be fired later,
+	 * which need net ref.
+	 */
+	sk = smc->clcsock->sk;
+	__netns_tracker_free(net, &sk->ns_tracker, false);
+	sk->sk_net_refcnt = 1;
+	get_net_track(net, &sk->ns_tracker, GFP_KERNEL);
+	sock_inuse_add(net, 1);
+	return 0;
+}
+
static int __smc_create(struct net *net, struct socket *sock, int protocol,
			int kern, struct socket *clcsock)
{
@@ -3346,35 +3380,12 @@ static int __smc_create(struct net *net, struct socket *sock, int protocol,

	/* create internal TCP socket for CLC handshake and fallback */
	smc = smc_sk(sk);
-	smc->use_fallback = false; /* assume rdma capability first */
-	smc->fallback_rsn = 0;
-
-	/* default behavior from limit_smc_hs in every net namespace */
-	smc->limit_smc_hs = net->smc.limit_smc_hs;

	rc = 0;
-	if (!clcsock) {
-		rc = sock_create_kern(net, family, SOCK_STREAM, IPPROTO_TCP,
-				      &smc->clcsock);
-		if (rc) {
-			sk_common_release(sk);
-			goto out;
-		}
-
-		/* smc_clcsock_release() does not wait smc->clcsock->sk's
-		 * destruction;  its sk_state might not be TCP_CLOSE after
-		 * smc->sk is close()d, and TCP timers can be fired later,
-		 * which need net ref.
-		 */
-		sk = smc->clcsock->sk;
-		__netns_tracker_free(net, &sk->ns_tracker, false);
-		sk->sk_net_refcnt = 1;
-		get_net_track(net, &sk->ns_tracker, GFP_KERNEL);
-		sock_inuse_add(net, 1);
-	} else {
+	if (!clcsock)
+		rc = __smc_create_clcsk(net, sk, family);
+	else
		smc->clcsock = clcsock;
-	}
-
out:
	return rc;
}
--
1.8.3.1






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