Re: [PATCH net-next v3 1/3] vsock: support sockmap

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On Tue, Feb 28, 2023 at 07:04:34PM +0000, Bobby Eshleman wrote:
This patch adds sockmap support for vsock sockets. It is intended to be
usable by all transports, but only the virtio transport is implemented.

Signed-off-by: Bobby Eshleman <bobby.eshleman@xxxxxxxxxxxxx>
---
drivers/vhost/vsock.c                   |   1 +
include/linux/virtio_vsock.h            |   1 +
include/net/af_vsock.h                  |  17 ++++
net/vmw_vsock/Makefile                  |   1 +
net/vmw_vsock/af_vsock.c                |  55 ++++++++--
net/vmw_vsock/virtio_transport.c        |   2 +
net/vmw_vsock/virtio_transport_common.c |  25 +++++
net/vmw_vsock/vsock_bpf.c               | 174 ++++++++++++++++++++++++++++++++
net/vmw_vsock/vsock_loopback.c          |   2 +
9 files changed, 272 insertions(+), 6 deletions(-)

diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c
index 1f3b89c885cc..3c6dc036b904 100644
--- a/drivers/vhost/vsock.c
+++ b/drivers/vhost/vsock.c
@@ -439,6 +439,7 @@ static struct virtio_transport vhost_transport = {
		.notify_send_post_enqueue = virtio_transport_notify_send_post_enqueue,
		.notify_buffer_size       = virtio_transport_notify_buffer_size,

+		.read_skb = virtio_transport_read_skb,
	},

	.send_pkt = vhost_transport_send_pkt,
diff --git a/include/linux/virtio_vsock.h b/include/linux/virtio_vsock.h
index 3f9c16611306..c58453699ee9 100644
--- a/include/linux/virtio_vsock.h
+++ b/include/linux/virtio_vsock.h
@@ -245,4 +245,5 @@ u32 virtio_transport_get_credit(struct virtio_vsock_sock *vvs, u32 wanted);
void virtio_transport_put_credit(struct virtio_vsock_sock *vvs, u32 credit);
void virtio_transport_deliver_tap_pkt(struct sk_buff *skb);
int virtio_transport_purge_skbs(void *vsk, struct sk_buff_head *list);
+int virtio_transport_read_skb(struct vsock_sock *vsk, skb_read_actor_t read_actor);
#endif /* _LINUX_VIRTIO_VSOCK_H */
diff --git a/include/net/af_vsock.h b/include/net/af_vsock.h
index 568a87c5e0d0..a73f5fbd296a 100644
--- a/include/net/af_vsock.h
+++ b/include/net/af_vsock.h
@@ -75,6 +75,7 @@ struct vsock_sock {
	void *trans;
};

+s64 vsock_connectible_has_data(struct vsock_sock *vsk);
s64 vsock_stream_has_data(struct vsock_sock *vsk);
s64 vsock_stream_has_space(struct vsock_sock *vsk);
struct sock *vsock_create_connected(struct sock *parent);
@@ -173,6 +174,9 @@ struct vsock_transport {

	/* Addressing. */
	u32 (*get_local_cid)(void);
+
+	/* Read a single skb */
+	int (*read_skb)(struct vsock_sock *, skb_read_actor_t);
};

/**** CORE ****/
@@ -225,5 +229,18 @@ int vsock_init_tap(void);
int vsock_add_tap(struct vsock_tap *vt);
int vsock_remove_tap(struct vsock_tap *vt);
void vsock_deliver_tap(struct sk_buff *build_skb(void *opaque), void *opaque);
+int vsock_connectible_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
+			      int flags);
+int vsock_dgram_recvmsg(struct socket *sock, struct msghdr *msg,
+			       size_t len, int flags);

Just because you have to resend a v4, here we can align as `checkpatch
--strict` suggests:

CHECK: Alignment should match open parenthesis
#63: FILE: include/net/af_vsock.h:235:
+int vsock_dgram_recvmsg(struct socket *sock, struct msghdr *msg,
+			      size_t len, int flags);

+
+#ifdef CONFIG_BPF_SYSCALL
+extern struct proto vsock_proto;
+int vsock_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore);
+void __init vsock_bpf_build_proto(void);
+#else
+static inline void __init vsock_bpf_build_proto(void)
+{}
+#endif

#endif /* __AF_VSOCK_H__ */
diff --git a/net/vmw_vsock/Makefile b/net/vmw_vsock/Makefile
index 6a943ec95c4a..5da74c4a9f1d 100644
--- a/net/vmw_vsock/Makefile
+++ b/net/vmw_vsock/Makefile
@@ -8,6 +8,7 @@ obj-$(CONFIG_HYPERV_VSOCKETS) += hv_sock.o
obj-$(CONFIG_VSOCKETS_LOOPBACK) += vsock_loopback.o

vsock-y += af_vsock.o af_vsock_tap.o vsock_addr.o
+vsock-$(CONFIG_BPF_SYSCALL) += vsock_bpf.o

vsock_diag-y += diag.o

diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c
index 19aea7cba26e..f2cc04fb8b13 100644
--- a/net/vmw_vsock/af_vsock.c
+++ b/net/vmw_vsock/af_vsock.c
@@ -116,10 +116,13 @@ static void vsock_sk_destruct(struct sock *sk);
static int vsock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb);

/* Protocol family. */
-static struct proto vsock_proto = {
+struct proto vsock_proto = {
	.name = "AF_VSOCK",
	.owner = THIS_MODULE,
	.obj_size = sizeof(struct vsock_sock),
+#ifdef CONFIG_BPF_SYSCALL
+	.psock_update_sk_prot = vsock_bpf_update_proto,
+#endif
};

/* The default peer timeout indicates how long we will wait for a peer response
@@ -865,7 +868,7 @@ s64 vsock_stream_has_data(struct vsock_sock *vsk)
}
EXPORT_SYMBOL_GPL(vsock_stream_has_data);

-static s64 vsock_connectible_has_data(struct vsock_sock *vsk)
+s64 vsock_connectible_has_data(struct vsock_sock *vsk)
{
	struct sock *sk = sk_vsock(vsk);

@@ -874,6 +877,7 @@ static s64 vsock_connectible_has_data(struct vsock_sock *vsk)
	else
		return vsock_stream_has_data(vsk);
}
+EXPORT_SYMBOL_GPL(vsock_connectible_has_data);

s64 vsock_stream_has_space(struct vsock_sock *vsk)
{
@@ -1131,6 +1135,13 @@ static __poll_t vsock_poll(struct file *file, struct socket *sock,
	return mask;
}

+static int vsock_read_skb(struct sock *sk, skb_read_actor_t read_actor)
+{
+	struct vsock_sock *vsk = vsock_sk(sk);
+
+	return vsk->transport->read_skb(vsk, read_actor);
+}
+
static int vsock_dgram_sendmsg(struct socket *sock, struct msghdr *msg,
			       size_t len)
{
@@ -1241,19 +1252,34 @@ static int vsock_dgram_connect(struct socket *sock,

	memcpy(&vsk->remote_addr, remote_addr, sizeof(vsk->remote_addr));
	sock->state = SS_CONNECTED;
+	sk->sk_state = TCP_ESTABLISHED;

out:
	release_sock(sk);
	return err;
}

-static int vsock_dgram_recvmsg(struct socket *sock, struct msghdr *msg,
-			       size_t len, int flags)
+int vsock_dgram_recvmsg(struct socket *sock, struct msghdr *msg,
+			size_t len, int flags)
{
-	struct vsock_sock *vsk = vsock_sk(sock->sk);
+#ifdef CONFIG_BPF_SYSCALL
+	const struct proto *prot;
+#endif
+	struct vsock_sock *vsk;
+	struct sock *sk;
+
+	sk = sock->sk;
+	vsk = vsock_sk(sk);
+
+#ifdef CONFIG_BPF_SYSCALL
+	prot = READ_ONCE(sk->sk_prot);
+	if (prot != &vsock_proto)
+		return prot->recvmsg(sk, msg, len, flags, NULL);
+#endif

	return vsk->transport->dgram_dequeue(vsk, msg, len, flags);
}
+EXPORT_SYMBOL_GPL(vsock_dgram_recvmsg);

static const struct proto_ops vsock_dgram_ops = {
	.family = PF_VSOCK,
@@ -1272,6 +1298,7 @@ static const struct proto_ops vsock_dgram_ops = {
	.recvmsg = vsock_dgram_recvmsg,
	.mmap = sock_no_mmap,
	.sendpage = sock_no_sendpage,
+	.read_skb = vsock_read_skb,
};

static int vsock_transport_cancel_pkt(struct vsock_sock *vsk)
@@ -2086,13 +2113,16 @@ static int __vsock_seqpacket_recvmsg(struct sock *sk, struct msghdr *msg,
	return err;
}

-static int
+int
vsock_connectible_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
			  int flags)
{
	struct sock *sk;
	struct vsock_sock *vsk;
	const struct vsock_transport *transport;
+#ifdef CONFIG_BPF_SYSCALL
+	const struct proto *prot;
+#endif
	int err;

	sk = sock->sk;
@@ -2139,6 +2169,14 @@ vsock_connectible_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
		goto out;
	}

+#ifdef CONFIG_BPF_SYSCALL
+	prot = READ_ONCE(sk->sk_prot);
+	if (prot != &vsock_proto) {
+		release_sock(sk);
+		return prot->recvmsg(sk, msg, len, flags, NULL);
+	}
+#endif
+
	if (sk->sk_type == SOCK_STREAM)
		err = __vsock_stream_recvmsg(sk, msg, len, flags);
	else
@@ -2148,6 +2186,7 @@ vsock_connectible_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
	release_sock(sk);
	return err;
}
+EXPORT_SYMBOL_GPL(vsock_connectible_recvmsg);

static int vsock_set_rcvlowat(struct sock *sk, int val)
{
@@ -2188,6 +2227,7 @@ static const struct proto_ops vsock_stream_ops = {
	.mmap = sock_no_mmap,
	.sendpage = sock_no_sendpage,
	.set_rcvlowat = vsock_set_rcvlowat,
+	.read_skb = vsock_read_skb,
};

static const struct proto_ops vsock_seqpacket_ops = {
@@ -2209,6 +2249,7 @@ static const struct proto_ops vsock_seqpacket_ops = {
	.recvmsg = vsock_connectible_recvmsg,
	.mmap = sock_no_mmap,
	.sendpage = sock_no_sendpage,
+	.read_skb = vsock_read_skb,
};

static int vsock_create(struct net *net, struct socket *sock,
@@ -2348,6 +2389,8 @@ static int __init vsock_init(void)
		goto err_unregister_proto;
	}

+	vsock_bpf_build_proto();
+
	return 0;

err_unregister_proto:
diff --git a/net/vmw_vsock/virtio_transport.c b/net/vmw_vsock/virtio_transport.c
index 28b5a8e8e094..e95df847176b 100644
--- a/net/vmw_vsock/virtio_transport.c
+++ b/net/vmw_vsock/virtio_transport.c
@@ -457,6 +457,8 @@ static struct virtio_transport virtio_transport = {
		.notify_send_pre_enqueue  = virtio_transport_notify_send_pre_enqueue,
		.notify_send_post_enqueue = virtio_transport_notify_send_post_enqueue,
		.notify_buffer_size       = virtio_transport_notify_buffer_size,
+
+		.read_skb = virtio_transport_read_skb,
	},

	.send_pkt = virtio_transport_send_pkt,
diff --git a/net/vmw_vsock/virtio_transport_common.c b/net/vmw_vsock/virtio_transport_common.c
index a1581c77cf84..f64527f32385 100644
--- a/net/vmw_vsock/virtio_transport_common.c
+++ b/net/vmw_vsock/virtio_transport_common.c
@@ -1388,6 +1388,31 @@ int virtio_transport_purge_skbs(void *vsk, struct sk_buff_head *queue)
}
EXPORT_SYMBOL_GPL(virtio_transport_purge_skbs);

+int virtio_transport_read_skb(struct vsock_sock *vsk, skb_read_actor_t recv_actor)
+{
+	struct virtio_vsock_sock *vvs = vsk->trans;
+	struct sock *sk = sk_vsock(vsk);
+	struct sk_buff *skb;
+	int off = 0;
+	int copied;
+	int err;
+
+	spin_lock_bh(&vvs->rx_lock);
+	/* Use __skb_recv_datagram() for race-free handling of the receive. It
+	 * works for types other than dgrams.
+	 */
+	skb = __skb_recv_datagram(sk, &vvs->rx_queue, MSG_DONTWAIT, &off, &err);
+	spin_unlock_bh(&vvs->rx_lock);
+
+	if (!skb)
+		return err;
+
+	copied = recv_actor(sk, skb);
+	kfree_skb(skb);
+	return copied;
+}
+EXPORT_SYMBOL_GPL(virtio_transport_read_skb);
+
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Asias He");
MODULE_DESCRIPTION("common code for virtio vsock");
diff --git a/net/vmw_vsock/vsock_bpf.c b/net/vmw_vsock/vsock_bpf.c
new file mode 100644
index 000000000000..9c71c163c684
--- /dev/null
+++ b/net/vmw_vsock/vsock_bpf.c
@@ -0,0 +1,174 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2022 Bobby Eshleman <bobby.eshleman@xxxxxxxxxxxxx>
+ *
+ * Based off of net/unix/unix_bpf.c
+ */
+
+#include <linux/bpf.h>
+#include <linux/module.h>
+#include <linux/skmsg.h>
+#include <linux/socket.h>
+#include <linux/wait.h>
+#include <net/af_vsock.h>
+#include <net/sock.h>
+
+#define vsock_sk_has_data(__sk, __psock)				\
+		({	!skb_queue_empty(&(__sk)->sk_receive_queue) ||	\
+			!skb_queue_empty(&(__psock)->ingress_skb) ||	\
+			!list_empty(&(__psock)->ingress_msg);		\
+		})
+
+static struct proto *vsock_prot_saved __read_mostly;
+static DEFINE_SPINLOCK(vsock_prot_lock);
+static struct proto vsock_bpf_prot;
+
+static bool vsock_has_data(struct sock *sk, struct sk_psock *psock)
+{
+	struct vsock_sock *vsk = vsock_sk(sk);
+	s64 ret;
+
+	ret = vsock_connectible_has_data(vsk);
+	if (ret > 0)
+		return true;
+
+	return vsock_sk_has_data(sk, psock);
+}
+
+static bool vsock_msg_wait_data(struct sock *sk, struct sk_psock *psock, long timeo)
+{
+	int ret;

`ret` can be bool now.

The rest LGTM.

Thanks,
Stefano




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