linux-kernel - [RFC PATCH 4/5] vsock: seqpacket

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Date: Fri, 17 May 2024 22:46:06 +0800
From: Xuewei Niu <niuxuewei97@...il.com>
To: stefanha@...hat.com,
	sgarzare@...hat.com
Cc: mst@...hat.com,
	davem@...emloft.net,
	kvm@...r.kernel.org,
	virtualization@...ts.linux.dev,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Xuewei Niu <niuxuewei.nxw@...group.com>
Subject: [RFC PATCH 4/5] vsock: seqpacket_allow adapts to multi-devices

Adds a new argument, named "src_cid", to let them know which `virtio_vsock`
to be selected.

Signed-off-by: Xuewei Niu <niuxuewei.nxw@...group.com>
---
 include/net/af_vsock.h           |  2 +-
 net/vmw_vsock/af_vsock.c         | 15 +++++++++++++--
 net/vmw_vsock/virtio_transport.c |  4 ++--
 net/vmw_vsock/vsock_loopback.c   |  4 ++--
 4 files changed, 18 insertions(+), 7 deletions(-)

diff --git a/include/net/af_vsock.h b/include/net/af_vsock.h
index 0151296a0bc5..25f7dc3d602d 100644
--- a/include/net/af_vsock.h
+++ b/include/net/af_vsock.h
@@ -143,7 +143,7 @@ struct vsock_transport {
 				     int flags);
 	int (*seqpacket_enqueue)(struct vsock_sock *vsk, struct msghdr *msg,
 				 size_t len);
-	bool (*seqpacket_allow)(u32 remote_cid);
+	bool (*seqpacket_allow)(u32 src_cid, u32 remote_cid);
 	u32 (*seqpacket_has_data)(struct vsock_sock *vsk);
 
 	/* Notification. */
diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c
index da06ddc940cd..3b34be802bf2 100644
--- a/net/vmw_vsock/af_vsock.c
+++ b/net/vmw_vsock/af_vsock.c
@@ -470,10 +470,12 @@ int vsock_assign_transport(struct vsock_sock *vsk, struct vsock_sock *psk)
 {
 	const struct vsock_transport *new_transport;
 	struct sock *sk = sk_vsock(vsk);
-	unsigned int remote_cid = vsk->remote_addr.svm_cid;
+	unsigned int src_cid, remote_cid;
 	__u8 remote_flags;
 	int ret;
 
+	remote_cid = vsk->remote_addr.svm_cid;
+
 	/* If the packet is coming with the source and destination CIDs higher
 	 * than VMADDR_CID_HOST, then a vsock channel where all the packets are
 	 * forwarded to the host should be established. Then the host will
@@ -527,8 +529,17 @@ int vsock_assign_transport(struct vsock_sock *vsk, struct vsock_sock *psk)
 		return -ENODEV;
 
 	if (sk->sk_type == SOCK_SEQPACKET) {
+		if (vsk->local_addr.svm_cid == VMADDR_CID_ANY) {
+			if (new_transport->get_default_cid)
+				src_cid = new_transport->get_default_cid();
+			else
+				src_cid = new_transport->get_local_cid();
+		} else {
+			src_cid = vsk->local_addr.svm_cid;
+		}
+
 		if (!new_transport->seqpacket_allow ||
-		    !new_transport->seqpacket_allow(remote_cid)) {
+		    !new_transport->seqpacket_allow(src_cid, remote_cid)) {
 			module_put(new_transport->module);
 			return -ESOCKTNOSUPPORT;
 		}
diff --git a/net/vmw_vsock/virtio_transport.c b/net/vmw_vsock/virtio_transport.c
index 998b22e5ce36..0bddcbd906a2 100644
--- a/net/vmw_vsock/virtio_transport.c
+++ b/net/vmw_vsock/virtio_transport.c
@@ -615,14 +615,14 @@ static struct virtio_transport virtio_transport = {
 	.can_msgzerocopy = virtio_transport_can_msgzerocopy,
 };
 
-static bool virtio_transport_seqpacket_allow(u32 remote_cid)
+static bool virtio_transport_seqpacket_allow(u32 src_cid, u32 remote_cid)
 {
 	struct virtio_vsock *vsock;
 	bool seqpacket_allow;
 
 	seqpacket_allow = false;
 	rcu_read_lock();
-	vsock = rcu_dereference(the_virtio_vsock);
+	vsock = virtio_transport_get_virtio_vsock(src_cid);
 	if (vsock)
 		seqpacket_allow = vsock->seqpacket_allow;
 	rcu_read_unlock();
diff --git a/net/vmw_vsock/vsock_loopback.c b/net/vmw_vsock/vsock_loopback.c
index 6dea6119f5b2..b94358f5bb2c 100644
--- a/net/vmw_vsock/vsock_loopback.c
+++ b/net/vmw_vsock/vsock_loopback.c
@@ -46,7 +46,7 @@ static int vsock_loopback_cancel_pkt(struct vsock_sock *vsk)
 	return 0;
 }
 
-static bool vsock_loopback_seqpacket_allow(u32 remote_cid);
+static bool vsock_loopback_seqpacket_allow(u32 src_cid, u32 remote_cid);
 static bool vsock_loopback_msgzerocopy_allow(void)
 {
 	return true;
@@ -104,7 +104,7 @@ static struct virtio_transport loopback_transport = {
 	.send_pkt = vsock_loopback_send_pkt,
 };
 
-static bool vsock_loopback_seqpacket_allow(u32 remote_cid)
+static bool vsock_loopback_seqpacket_allow(u32 src_cid, u32 remote_cid)
 {
 	return true;
 }
-- 
2.34.1