netdev - [RFC PATCH net-next v6 02/14] af_vsock: refactor transport lookup code

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Message-Id: <20240710212555.1617795-3-amery.hung@bytedance.com>
Date: Wed, 10 Jul 2024 21:25:43 +0000
From: Amery Hung <ameryhung@...il.com>
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Subject: [RFC PATCH net-next v6 02/14] af_vsock: refactor transport lookup code

From: Bobby Eshleman <bobby.eshleman@...edance.com>

Introduce new reusable function vsock_connectible_lookup_transport()
that performs the transport lookup logic.

No functional change intended.

Reviewed-by: Stefano Garzarella <sgarzare@...hat.com>
Signed-off-by: Bobby Eshleman <bobby.eshleman@...edance.com>
---
 net/vmw_vsock/af_vsock.c | 25 ++++++++++++++++++-------
 1 file changed, 18 insertions(+), 7 deletions(-)

diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c
index 5e7d4d99ea2c..98d10cd30483 100644
--- a/net/vmw_vsock/af_vsock.c
+++ b/net/vmw_vsock/af_vsock.c
@@ -424,6 +424,22 @@ static void vsock_deassign_transport(struct vsock_sock *vsk)
 	vsk->transport = NULL;
 }
 
+static const struct vsock_transport *
+vsock_connectible_lookup_transport(unsigned int cid, __u8 flags)
+{
+	const struct vsock_transport *transport;
+
+	if (vsock_use_local_transport(cid))
+		transport = transport_local;
+	else if (cid <= VMADDR_CID_HOST || !transport_h2g ||
+		 (flags & VMADDR_FLAG_TO_HOST))
+		transport = transport_g2h;
+	else
+		transport = transport_h2g;
+
+	return transport;
+}
+
 /* Assign a transport to a socket and call the .init transport callback.
  *
  * Note: for connection oriented socket this must be called when vsk->remote_addr
@@ -464,13 +480,8 @@ int vsock_assign_transport(struct vsock_sock *vsk, struct vsock_sock *psk)
 		break;
 	case SOCK_STREAM:
 	case SOCK_SEQPACKET:
-		if (vsock_use_local_transport(remote_cid))
-			new_transport = transport_local;
-		else if (remote_cid <= VMADDR_CID_HOST || !transport_h2g ||
-			 (remote_flags & VMADDR_FLAG_TO_HOST))
-			new_transport = transport_g2h;
-		else
-			new_transport = transport_h2g;
+		new_transport = vsock_connectible_lookup_transport(remote_cid,
+								   remote_flags);
 		break;
 	default:
 		return -ESOCKTNOSUPPORT;
-- 
2.20.1