[PATCH RFC net-next v4 2/8] vsock: refactor transport lookup code

[Bobby Eshleman <bobby.eshleman@bytedance.com>]

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

No functional change intended.

Signed-off-by: Bobby Eshleman <bobby.eshleman@bytedance.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 ffb4dd8b6ea7..74358f0b47fa 100644
--- a/net/vmw_vsock/af_vsock.c
+++ b/net/vmw_vsock/af_vsock.c
@@ -422,6 +422,22 @@ 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
@@ -462,13 +478,8 @@ 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;

-- 
2.30.2