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[RFC,v4,12/17] virtio/vsock: rest of SOCK_SEQPACKET support

Message ID 20210207151747.805754-1-arseny.krasnov@kaspersky.com (mailing list archive)
State Superseded
Delegated to: Netdev Maintainers
Headers show
Series virtio/vsock: introduce SOCK_SEQPACKET support | expand

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Commit Message

Arseny Krasnov Feb. 7, 2021, 3:17 p.m. UTC 
This adds rest of logic for SEQPACKET:
1) Packet's type is now set in 'virtio_send_pkt_info()' using
   type of socket.
2) SEQPACKET specific functions which send SEQ_BEGIN/SEQ_END.
   Note that both functions may sleep to wait enough space for
   SEQPACKET header.
3) SEQ_BEGIN/SEQ_END to TAP packet capture.
4) Send SHUTDOWN on socket close for SEQPACKET type.

Signed-off-by: Arseny Krasnov <arseny.krasnov@kaspersky.com>
---
 include/linux/virtio_vsock.h            |  9 +++
 net/vmw_vsock/virtio_transport_common.c | 99 +++++++++++++++++++++----
 2 files changed, 95 insertions(+), 13 deletions(-)

Comments

Arseny Krasnov Feb. 11, 2021, 11 a.m. UTC | #1 
On 07.02.2021 18:17, Arseny Krasnov wrote:
> This adds rest of logic for SEQPACKET:
> 1) Packet's type is now set in 'virtio_send_pkt_info()' using
>    type of socket.
> 2) SEQPACKET specific functions which send SEQ_BEGIN/SEQ_END.
>    Note that both functions may sleep to wait enough space for
>    SEQPACKET header.
> 3) SEQ_BEGIN/SEQ_END to TAP packet capture.
> 4) Send SHUTDOWN on socket close for SEQPACKET type.
>
> Signed-off-by: Arseny Krasnov <arseny.krasnov@kaspersky.com>
> ---
>  include/linux/virtio_vsock.h            |  9 +++
>  net/vmw_vsock/virtio_transport_common.c | 99 +++++++++++++++++++++----
>  2 files changed, 95 insertions(+), 13 deletions(-)
>
> diff --git a/include/linux/virtio_vsock.h b/include/linux/virtio_vsock.h
> index a5e8681bfc6a..c4a39424686d 100644
> --- a/include/linux/virtio_vsock.h
> +++ b/include/linux/virtio_vsock.h
> @@ -41,6 +41,7 @@ struct virtio_vsock_sock {
>  	u32 user_read_seq_len;
>  	u32 user_read_copied;
>  	u32 curr_rx_msg_cnt;
> +	u32 next_tx_msg_cnt;
>  };
>  
>  struct virtio_vsock_pkt {
> @@ -85,7 +86,15 @@ virtio_transport_dgram_dequeue(struct vsock_sock *vsk,
>  			       struct msghdr *msg,
>  			       size_t len, int flags);
>  
> +int virtio_transport_seqpacket_seq_send_len(struct vsock_sock *vsk, size_t len, int flags);
> +int virtio_transport_seqpacket_seq_send_eor(struct vsock_sock *vsk, int flags);
>  size_t virtio_transport_seqpacket_seq_get_len(struct vsock_sock *vsk);
> +int
> +virtio_transport_seqpacket_dequeue(struct vsock_sock *vsk,
> +				   struct msghdr *msg,
> +				   int flags,
> +				   bool *msg_ready);
> +
>  s64 virtio_transport_stream_has_data(struct vsock_sock *vsk);
>  s64 virtio_transport_stream_has_space(struct vsock_sock *vsk);
>  
> diff --git a/net/vmw_vsock/virtio_transport_common.c b/net/vmw_vsock/virtio_transport_common.c
> index 51b66f8dd7c7..0aa0fd33e9d6 100644
> --- a/net/vmw_vsock/virtio_transport_common.c
> +++ b/net/vmw_vsock/virtio_transport_common.c
> @@ -139,6 +139,8 @@ static struct sk_buff *virtio_transport_build_skb(void *opaque)
>  		break;
>  	case VIRTIO_VSOCK_OP_CREDIT_UPDATE:
>  	case VIRTIO_VSOCK_OP_CREDIT_REQUEST:
> +	case VIRTIO_VSOCK_OP_SEQ_BEGIN:
> +	case VIRTIO_VSOCK_OP_SEQ_END:
>  		hdr->op = cpu_to_le16(AF_VSOCK_OP_CONTROL);
>  		break;
>  	default:
> @@ -165,6 +167,14 @@ void virtio_transport_deliver_tap_pkt(struct virtio_vsock_pkt *pkt)
>  }
>  EXPORT_SYMBOL_GPL(virtio_transport_deliver_tap_pkt);
>  
> +static u16 virtio_transport_get_type(struct sock *sk)
> +{
> +	if (sk->sk_type == SOCK_STREAM)
> +		return VIRTIO_VSOCK_TYPE_STREAM;
> +	else
> +		return VIRTIO_VSOCK_TYPE_SEQPACKET;
> +}
> +
>  /* This function can only be used on connecting/connected sockets,
>   * since a socket assigned to a transport is required.
>   *
> @@ -179,6 +189,13 @@ static int virtio_transport_send_pkt_info(struct vsock_sock *vsk,
>  	struct virtio_vsock_pkt *pkt;
>  	u32 pkt_len = info->pkt_len;
>  
> +	info->type = virtio_transport_get_type(sk_vsock(vsk));
> +
> +	if (info->type == VIRTIO_VSOCK_TYPE_SEQPACKET &&
> +	    info->msg &&
> +	    info->msg->msg_flags & MSG_EOR)
> +		info->flags |= VIRTIO_VSOCK_RW_EOR;
> +
>  	t_ops = virtio_transport_get_ops(vsk);
>  	if (unlikely(!t_ops))
>  		return -EFAULT;
> @@ -397,13 +414,61 @@ virtio_transport_stream_do_dequeue(struct vsock_sock *vsk,
>  	return err;
>  }
>  
> -static u16 virtio_transport_get_type(struct sock *sk)
> +static int virtio_transport_seqpacket_send_ctrl(struct vsock_sock *vsk,
> +						int type,
> +						size_t len,
> +						int flags)
>  {
> -	if (sk->sk_type == SOCK_STREAM)
> -		return VIRTIO_VSOCK_TYPE_STREAM;
> -	else
> -		return VIRTIO_VSOCK_TYPE_SEQPACKET;
> +	struct virtio_vsock_sock *vvs = vsk->trans;
> +	struct virtio_vsock_pkt_info info = {
> +		.op = type,
> +		.vsk = vsk,
> +		.pkt_len = sizeof(struct virtio_vsock_seq_hdr)
> +	};
> +
> +	struct virtio_vsock_seq_hdr seq_hdr = {
> +		.msg_cnt = vvs->next_tx_msg_cnt,
> +		.msg_len = len
Oops, forgot to use 'cpu_to_le32()'. Will fix in v5
> +	};
> +
> +	struct kvec seq_hdr_kiov = {
> +		.iov_base = (void *)&seq_hdr,
> +		.iov_len = sizeof(struct virtio_vsock_seq_hdr)
> +	};
> +
> +	struct msghdr msg = {0};
> +
> +	//XXX: do we need 'vsock_transport_send_notify_data' pointer?
> +	if (vsock_wait_space(sk_vsock(vsk),
> +			     sizeof(struct virtio_vsock_seq_hdr),
> +			     flags, NULL))
> +		return -1;
> +
> +	iov_iter_kvec(&msg.msg_iter, WRITE, &seq_hdr_kiov, 1, sizeof(seq_hdr));
> +
> +	info.msg = &msg;
> +	vvs->next_tx_msg_cnt++;
> +
> +	return virtio_transport_send_pkt_info(vsk, &info);
> +}
> +
> +int virtio_transport_seqpacket_seq_send_len(struct vsock_sock *vsk, size_t len, int flags)
> +{
> +	return virtio_transport_seqpacket_send_ctrl(vsk,
> +						    VIRTIO_VSOCK_OP_SEQ_BEGIN,
> +						    len,
> +						    flags);
>  }
> +EXPORT_SYMBOL_GPL(virtio_transport_seqpacket_seq_send_len);
> +
> +int virtio_transport_seqpacket_seq_send_eor(struct vsock_sock *vsk, int flags)
> +{
> +	return virtio_transport_seqpacket_send_ctrl(vsk,
> +						    VIRTIO_VSOCK_OP_SEQ_END,
> +						    0,
> +						    flags);
> +}
> +EXPORT_SYMBOL_GPL(virtio_transport_seqpacket_seq_send_eor);
>  
>  static inline void virtio_transport_remove_pkt(struct virtio_vsock_pkt *pkt)
>  {
> @@ -577,6 +642,18 @@ virtio_transport_stream_dequeue(struct vsock_sock *vsk,
>  }
>  EXPORT_SYMBOL_GPL(virtio_transport_stream_dequeue);
>  
> +int
> +virtio_transport_seqpacket_dequeue(struct vsock_sock *vsk,
> +				   struct msghdr *msg,
> +				   int flags, bool *msg_ready)
> +{
> +	if (flags & MSG_PEEK)
> +		return -EOPNOTSUPP;
> +
> +	return virtio_transport_seqpacket_do_dequeue(vsk, msg, msg_ready);
> +}
> +EXPORT_SYMBOL_GPL(virtio_transport_seqpacket_dequeue);
> +
>  int
>  virtio_transport_dgram_dequeue(struct vsock_sock *vsk,
>  			       struct msghdr *msg,
> @@ -658,14 +735,15 @@ EXPORT_SYMBOL_GPL(virtio_transport_do_socket_init);
>  void virtio_transport_notify_buffer_size(struct vsock_sock *vsk, u64 *val)
>  {
>  	struct virtio_vsock_sock *vvs = vsk->trans;
> +	int type;
>  
>  	if (*val > VIRTIO_VSOCK_MAX_BUF_SIZE)
>  		*val = VIRTIO_VSOCK_MAX_BUF_SIZE;
>  
>  	vvs->buf_alloc = *val;
>  
> -	virtio_transport_send_credit_update(vsk, VIRTIO_VSOCK_TYPE_STREAM,
> -					    NULL);
> +	type = virtio_transport_get_type(sk_vsock(vsk));
> +	virtio_transport_send_credit_update(vsk, type, NULL);
>  }
>  EXPORT_SYMBOL_GPL(virtio_transport_notify_buffer_size);
>  
> @@ -792,7 +870,6 @@ int virtio_transport_connect(struct vsock_sock *vsk)
>  {
>  	struct virtio_vsock_pkt_info info = {
>  		.op = VIRTIO_VSOCK_OP_REQUEST,
> -		.type = VIRTIO_VSOCK_TYPE_STREAM,
>  		.vsk = vsk,
>  	};
>  
> @@ -804,7 +881,6 @@ int virtio_transport_shutdown(struct vsock_sock *vsk, int mode)
>  {
>  	struct virtio_vsock_pkt_info info = {
>  		.op = VIRTIO_VSOCK_OP_SHUTDOWN,
> -		.type = VIRTIO_VSOCK_TYPE_STREAM,
>  		.flags = (mode & RCV_SHUTDOWN ?
>  			  VIRTIO_VSOCK_SHUTDOWN_RCV : 0) |
>  			 (mode & SEND_SHUTDOWN ?
> @@ -833,7 +909,6 @@ virtio_transport_stream_enqueue(struct vsock_sock *vsk,
>  {
>  	struct virtio_vsock_pkt_info info = {
>  		.op = VIRTIO_VSOCK_OP_RW,
> -		.type = VIRTIO_VSOCK_TYPE_STREAM,
>  		.msg = msg,
>  		.pkt_len = len,
>  		.vsk = vsk,
> @@ -856,7 +931,6 @@ static int virtio_transport_reset(struct vsock_sock *vsk,
>  {
>  	struct virtio_vsock_pkt_info info = {
>  		.op = VIRTIO_VSOCK_OP_RST,
> -		.type = VIRTIO_VSOCK_TYPE_STREAM,
>  		.reply = !!pkt,
>  		.vsk = vsk,
>  	};
> @@ -1001,7 +1075,7 @@ void virtio_transport_release(struct vsock_sock *vsk)
>  	struct sock *sk = &vsk->sk;
>  	bool remove_sock = true;
>  
> -	if (sk->sk_type == SOCK_STREAM)
> +	if (sk->sk_type == SOCK_STREAM || sk->sk_type == SOCK_SEQPACKET)
>  		remove_sock = virtio_transport_close(vsk);
>  
>  	list_for_each_entry_safe(pkt, tmp, &vvs->rx_queue, list) {
> @@ -1164,7 +1238,6 @@ virtio_transport_send_response(struct vsock_sock *vsk,
>  {
>  	struct virtio_vsock_pkt_info info = {
>  		.op = VIRTIO_VSOCK_OP_RESPONSE,
> -		.type = VIRTIO_VSOCK_TYPE_STREAM,
>  		.remote_cid = le64_to_cpu(pkt->hdr.src_cid),
>  		.remote_port = le32_to_cpu(pkt->hdr.src_port),
>  		.reply = true,
Stefano Garzarella Feb. 11, 2021, 2:29 p.m. UTC | #2 
On Sun, Feb 07, 2021 at 06:17:44PM +0300, Arseny Krasnov wrote:
>This adds rest of logic for SEQPACKET:
>1) Packet's type is now set in 'virtio_send_pkt_info()' using
>   type of socket.
>2) SEQPACKET specific functions which send SEQ_BEGIN/SEQ_END.
>   Note that both functions may sleep to wait enough space for
>   SEQPACKET header.
>3) SEQ_BEGIN/SEQ_END to TAP packet capture.
>4) Send SHUTDOWN on socket close for SEQPACKET type.
>
>Signed-off-by: Arseny Krasnov <arseny.krasnov@kaspersky.com>
>---
> include/linux/virtio_vsock.h            |  9 +++
> net/vmw_vsock/virtio_transport_common.c | 99 +++++++++++++++++++++----
> 2 files changed, 95 insertions(+), 13 deletions(-)
>
>diff --git a/include/linux/virtio_vsock.h b/include/linux/virtio_vsock.h
>index a5e8681bfc6a..c4a39424686d 100644
>--- a/include/linux/virtio_vsock.h
>+++ b/include/linux/virtio_vsock.h
>@@ -41,6 +41,7 @@ struct virtio_vsock_sock {
> 	u32 user_read_seq_len;
> 	u32 user_read_copied;
> 	u32 curr_rx_msg_cnt;
>+	u32 next_tx_msg_cnt;
> };
>
> struct virtio_vsock_pkt {
>@@ -85,7 +86,15 @@ virtio_transport_dgram_dequeue(struct vsock_sock *vsk,
> 			       struct msghdr *msg,
> 			       size_t len, int flags);
>
>+int virtio_transport_seqpacket_seq_send_len(struct vsock_sock *vsk, size_t len, int flags);
>+int virtio_transport_seqpacket_seq_send_eor(struct vsock_sock *vsk, int flags);
> size_t virtio_transport_seqpacket_seq_get_len(struct vsock_sock *vsk);
>+int
>+virtio_transport_seqpacket_dequeue(struct vsock_sock *vsk,
>+				   struct msghdr *msg,
>+				   int flags,
>+				   bool *msg_ready);
>+
> s64 virtio_transport_stream_has_data(struct vsock_sock *vsk);
> s64 virtio_transport_stream_has_space(struct vsock_sock *vsk);
>
>diff --git a/net/vmw_vsock/virtio_transport_common.c b/net/vmw_vsock/virtio_transport_common.c
>index 51b66f8dd7c7..0aa0fd33e9d6 100644
>--- a/net/vmw_vsock/virtio_transport_common.c
>+++ b/net/vmw_vsock/virtio_transport_common.c
>@@ -139,6 +139,8 @@ static struct sk_buff *virtio_transport_build_skb(void *opaque)
> 		break;
> 	case VIRTIO_VSOCK_OP_CREDIT_UPDATE:
> 	case VIRTIO_VSOCK_OP_CREDIT_REQUEST:
>+	case VIRTIO_VSOCK_OP_SEQ_BEGIN:
>+	case VIRTIO_VSOCK_OP_SEQ_END:
> 		hdr->op = cpu_to_le16(AF_VSOCK_OP_CONTROL);
> 		break;
> 	default:
>@@ -165,6 +167,14 @@ void virtio_transport_deliver_tap_pkt(struct virtio_vsock_pkt *pkt)
> }
> EXPORT_SYMBOL_GPL(virtio_transport_deliver_tap_pkt);
>
>+static u16 virtio_transport_get_type(struct sock *sk)
>+{
>+	if (sk->sk_type == SOCK_STREAM)
>+		return VIRTIO_VSOCK_TYPE_STREAM;
>+	else
>+		return VIRTIO_VSOCK_TYPE_SEQPACKET;
>+}
>+

Maybe add this function in this part of the file from the first patch, 
so you don't need to move it in this series.

> /* This function can only be used on connecting/connected sockets,
>  * since a socket assigned to a transport is required.
>  *
>@@ -179,6 +189,13 @@ static int virtio_transport_send_pkt_info(struct vsock_sock *vsk,
> 	struct virtio_vsock_pkt *pkt;
> 	u32 pkt_len = info->pkt_len;
>
>+	info->type = virtio_transport_get_type(sk_vsock(vsk));

I'd this change in another patch before this one, since this touch also 
the stream part.

>+
>+	if (info->type == VIRTIO_VSOCK_TYPE_SEQPACKET &&
>+	    info->msg &&
>+	    info->msg->msg_flags & MSG_EOR)
>+		info->flags |= VIRTIO_VSOCK_RW_EOR;
>+
> 	t_ops = virtio_transport_get_ops(vsk);
> 	if (unlikely(!t_ops))
> 		return -EFAULT;
>@@ -397,13 +414,61 @@ virtio_transport_stream_do_dequeue(struct vsock_sock *vsk,
> 	return err;
> }
>
>-static u16 virtio_transport_get_type(struct sock *sk)
>+static int virtio_transport_seqpacket_send_ctrl(struct vsock_sock *vsk,
>+						int type,
>+						size_t len,
>+						int flags)
> {
>-	if (sk->sk_type == SOCK_STREAM)
>-		return VIRTIO_VSOCK_TYPE_STREAM;
>-	else
>-		return VIRTIO_VSOCK_TYPE_SEQPACKET;
>+	struct virtio_vsock_sock *vvs = vsk->trans;
>+	struct virtio_vsock_pkt_info info = {
>+		.op = type,
>+		.vsk = vsk,
>+		.pkt_len = sizeof(struct virtio_vsock_seq_hdr)
>+	};
>+
>+	struct virtio_vsock_seq_hdr seq_hdr = {
>+		.msg_cnt = vvs->next_tx_msg_cnt,
>+		.msg_len = len
>+	};
>+
>+	struct kvec seq_hdr_kiov = {
>+		.iov_base = (void *)&seq_hdr,
>+		.iov_len = sizeof(struct virtio_vsock_seq_hdr)
>+	};
>+
>+	struct msghdr msg = {0};
>+
>+	//XXX: do we need 'vsock_transport_send_notify_data' pointer?
>+	if (vsock_wait_space(sk_vsock(vsk),
>+			     sizeof(struct virtio_vsock_seq_hdr),
>+			     flags, NULL))
>+		return -1;
>+
>+	iov_iter_kvec(&msg.msg_iter, WRITE, &seq_hdr_kiov, 1, sizeof(seq_hdr));
>+
>+	info.msg = &msg;
>+	vvs->next_tx_msg_cnt++;
>+
>+	return virtio_transport_send_pkt_info(vsk, &info);
>+}
>+
>+int virtio_transport_seqpacket_seq_send_len(struct vsock_sock *vsk, size_t len, int flags)
>+{
>+	return virtio_transport_seqpacket_send_ctrl(vsk,
>+						    VIRTIO_VSOCK_OP_SEQ_BEGIN,
>+						    len,
>+						    flags);
> }
>+EXPORT_SYMBOL_GPL(virtio_transport_seqpacket_seq_send_len);
>+
>+int virtio_transport_seqpacket_seq_send_eor(struct vsock_sock *vsk, int flags)
>+{
>+	return virtio_transport_seqpacket_send_ctrl(vsk,
>+						    VIRTIO_VSOCK_OP_SEQ_END,
>+						    0,
>+						    flags);
>+}
>+EXPORT_SYMBOL_GPL(virtio_transport_seqpacket_seq_send_eor);
>
> static inline void virtio_transport_remove_pkt(struct virtio_vsock_pkt *pkt)
> {
>@@ -577,6 +642,18 @@ virtio_transport_stream_dequeue(struct vsock_sock *vsk,
> }
> EXPORT_SYMBOL_GPL(virtio_transport_stream_dequeue);
>
>+int
>+virtio_transport_seqpacket_dequeue(struct vsock_sock *vsk,
>+				   struct msghdr *msg,
>+				   int flags, bool *msg_ready)
>+{
>+	if (flags & MSG_PEEK)
>+		return -EOPNOTSUPP;
>+
>+	return virtio_transport_seqpacket_do_dequeue(vsk, msg, msg_ready);
>+}
>+EXPORT_SYMBOL_GPL(virtio_transport_seqpacket_dequeue);
>+
> int
> virtio_transport_dgram_dequeue(struct vsock_sock *vsk,
> 			       struct msghdr *msg,
>@@ -658,14 +735,15 @@ EXPORT_SYMBOL_GPL(virtio_transport_do_socket_init);
> void virtio_transport_notify_buffer_size(struct vsock_sock *vsk, u64 *val)
> {
> 	struct virtio_vsock_sock *vvs = vsk->trans;
>+	int type;
>
> 	if (*val > VIRTIO_VSOCK_MAX_BUF_SIZE)
> 		*val = VIRTIO_VSOCK_MAX_BUF_SIZE;
>
> 	vvs->buf_alloc = *val;
>
>-	virtio_transport_send_credit_update(vsk, VIRTIO_VSOCK_TYPE_STREAM,
>-					    NULL);
>+	type = virtio_transport_get_type(sk_vsock(vsk));
>+	virtio_transport_send_credit_update(vsk, type, NULL);

I think we can remove the 'type' parameter of 
virtio_transport_send_credit_update() since 
virtio_transport_send_pkt_info() will overwrite it.

> }
> EXPORT_SYMBOL_GPL(virtio_transport_notify_buffer_size);
>
>@@ -792,7 +870,6 @@ int virtio_transport_connect(struct vsock_sock *vsk)
> {
> 	struct virtio_vsock_pkt_info info = {
> 		.op = VIRTIO_VSOCK_OP_REQUEST,
>-		.type = VIRTIO_VSOCK_TYPE_STREAM,
> 		.vsk = vsk,
> 	};
>
>@@ -804,7 +881,6 @@ int virtio_transport_shutdown(struct vsock_sock *vsk, int mode)
> {
> 	struct virtio_vsock_pkt_info info = {
> 		.op = VIRTIO_VSOCK_OP_SHUTDOWN,
>-		.type = VIRTIO_VSOCK_TYPE_STREAM,
> 		.flags = (mode & RCV_SHUTDOWN ?
> 			  VIRTIO_VSOCK_SHUTDOWN_RCV : 0) |
> 			 (mode & SEND_SHUTDOWN ?
>@@ -833,7 +909,6 @@ virtio_transport_stream_enqueue(struct vsock_sock *vsk,
> {
> 	struct virtio_vsock_pkt_info info = {
> 		.op = VIRTIO_VSOCK_OP_RW,
>-		.type = VIRTIO_VSOCK_TYPE_STREAM,
> 		.msg = msg,
> 		.pkt_len = len,
> 		.vsk = vsk,
>@@ -856,7 +931,6 @@ static int virtio_transport_reset(struct vsock_sock *vsk,
> {
> 	struct virtio_vsock_pkt_info info = {
> 		.op = VIRTIO_VSOCK_OP_RST,
>-		.type = VIRTIO_VSOCK_TYPE_STREAM,
> 		.reply = !!pkt,
> 		.vsk = vsk,
> 	};

These changes could go with the new patch to handle the type directly in 
the virtio_transport_send_pkt_info().


>@@ -1001,7 +1075,7 @@ void virtio_transport_release(struct vsock_sock *vsk)
> 	struct sock *sk = &vsk->sk;
> 	bool remove_sock = true;
>
>-	if (sk->sk_type == SOCK_STREAM)
>+	if (sk->sk_type == SOCK_STREAM || sk->sk_type == SOCK_SEQPACKET)
> 		remove_sock = virtio_transport_close(vsk);
>
> 	list_for_each_entry_safe(pkt, tmp, &vvs->rx_queue, list) {
>@@ -1164,7 +1238,6 @@ virtio_transport_send_response(struct vsock_sock *vsk,
> {
> 	struct virtio_vsock_pkt_info info = {
> 		.op = VIRTIO_VSOCK_OP_RESPONSE,
>-		.type = VIRTIO_VSOCK_TYPE_STREAM,
> 		.remote_cid = le64_to_cpu(pkt->hdr.src_cid),
> 		.remote_port = le32_to_cpu(pkt->hdr.src_port),
> 		.reply = true,

Also this one.

Thanks,
Stefano
diff mbox series

Patch

diff --git a/include/linux/virtio_vsock.h b/include/linux/virtio_vsock.h
index a5e8681bfc6a..c4a39424686d 100644
--- a/include/linux/virtio_vsock.h
+++ b/include/linux/virtio_vsock.h
@@ -41,6 +41,7 @@  struct virtio_vsock_sock {
 	u32 user_read_seq_len;
 	u32 user_read_copied;
 	u32 curr_rx_msg_cnt;
+	u32 next_tx_msg_cnt;
 };
 
 struct virtio_vsock_pkt {
@@ -85,7 +86,15 @@  virtio_transport_dgram_dequeue(struct vsock_sock *vsk,
 			       struct msghdr *msg,
 			       size_t len, int flags);
 
+int virtio_transport_seqpacket_seq_send_len(struct vsock_sock *vsk, size_t len, int flags);
+int virtio_transport_seqpacket_seq_send_eor(struct vsock_sock *vsk, int flags);
 size_t virtio_transport_seqpacket_seq_get_len(struct vsock_sock *vsk);
+int
+virtio_transport_seqpacket_dequeue(struct vsock_sock *vsk,
+				   struct msghdr *msg,
+				   int flags,
+				   bool *msg_ready);
+
 s64 virtio_transport_stream_has_data(struct vsock_sock *vsk);
 s64 virtio_transport_stream_has_space(struct vsock_sock *vsk);
 
diff --git a/net/vmw_vsock/virtio_transport_common.c b/net/vmw_vsock/virtio_transport_common.c
index 51b66f8dd7c7..0aa0fd33e9d6 100644
--- a/net/vmw_vsock/virtio_transport_common.c
+++ b/net/vmw_vsock/virtio_transport_common.c
@@ -139,6 +139,8 @@  static struct sk_buff *virtio_transport_build_skb(void *opaque)
 		break;
 	case VIRTIO_VSOCK_OP_CREDIT_UPDATE:
 	case VIRTIO_VSOCK_OP_CREDIT_REQUEST:
+	case VIRTIO_VSOCK_OP_SEQ_BEGIN:
+	case VIRTIO_VSOCK_OP_SEQ_END:
 		hdr->op = cpu_to_le16(AF_VSOCK_OP_CONTROL);
 		break;
 	default:
@@ -165,6 +167,14 @@  void virtio_transport_deliver_tap_pkt(struct virtio_vsock_pkt *pkt)
 }
 EXPORT_SYMBOL_GPL(virtio_transport_deliver_tap_pkt);
 
+static u16 virtio_transport_get_type(struct sock *sk)
+{
+	if (sk->sk_type == SOCK_STREAM)
+		return VIRTIO_VSOCK_TYPE_STREAM;
+	else
+		return VIRTIO_VSOCK_TYPE_SEQPACKET;
+}
+
 /* This function can only be used on connecting/connected sockets,
  * since a socket assigned to a transport is required.
  *
@@ -179,6 +189,13 @@  static int virtio_transport_send_pkt_info(struct vsock_sock *vsk,
 	struct virtio_vsock_pkt *pkt;
 	u32 pkt_len = info->pkt_len;
 
+	info->type = virtio_transport_get_type(sk_vsock(vsk));
+
+	if (info->type == VIRTIO_VSOCK_TYPE_SEQPACKET &&
+	    info->msg &&
+	    info->msg->msg_flags & MSG_EOR)
+		info->flags |= VIRTIO_VSOCK_RW_EOR;
+
 	t_ops = virtio_transport_get_ops(vsk);
 	if (unlikely(!t_ops))
 		return -EFAULT;
@@ -397,13 +414,61 @@  virtio_transport_stream_do_dequeue(struct vsock_sock *vsk,
 	return err;
 }
 
-static u16 virtio_transport_get_type(struct sock *sk)
+static int virtio_transport_seqpacket_send_ctrl(struct vsock_sock *vsk,
+						int type,
+						size_t len,
+						int flags)
 {
-	if (sk->sk_type == SOCK_STREAM)
-		return VIRTIO_VSOCK_TYPE_STREAM;
-	else
-		return VIRTIO_VSOCK_TYPE_SEQPACKET;
+	struct virtio_vsock_sock *vvs = vsk->trans;
+	struct virtio_vsock_pkt_info info = {
+		.op = type,
+		.vsk = vsk,
+		.pkt_len = sizeof(struct virtio_vsock_seq_hdr)
+	};
+
+	struct virtio_vsock_seq_hdr seq_hdr = {
+		.msg_cnt = vvs->next_tx_msg_cnt,
+		.msg_len = len
+	};
+
+	struct kvec seq_hdr_kiov = {
+		.iov_base = (void *)&seq_hdr,
+		.iov_len = sizeof(struct virtio_vsock_seq_hdr)
+	};
+
+	struct msghdr msg = {0};
+
+	//XXX: do we need 'vsock_transport_send_notify_data' pointer?
+	if (vsock_wait_space(sk_vsock(vsk),
+			     sizeof(struct virtio_vsock_seq_hdr),
+			     flags, NULL))
+		return -1;
+
+	iov_iter_kvec(&msg.msg_iter, WRITE, &seq_hdr_kiov, 1, sizeof(seq_hdr));
+
+	info.msg = &msg;
+	vvs->next_tx_msg_cnt++;
+
+	return virtio_transport_send_pkt_info(vsk, &info);
+}
+
+int virtio_transport_seqpacket_seq_send_len(struct vsock_sock *vsk, size_t len, int flags)
+{
+	return virtio_transport_seqpacket_send_ctrl(vsk,
+						    VIRTIO_VSOCK_OP_SEQ_BEGIN,
+						    len,
+						    flags);
 }
+EXPORT_SYMBOL_GPL(virtio_transport_seqpacket_seq_send_len);
+
+int virtio_transport_seqpacket_seq_send_eor(struct vsock_sock *vsk, int flags)
+{
+	return virtio_transport_seqpacket_send_ctrl(vsk,
+						    VIRTIO_VSOCK_OP_SEQ_END,
+						    0,
+						    flags);
+}
+EXPORT_SYMBOL_GPL(virtio_transport_seqpacket_seq_send_eor);
 
 static inline void virtio_transport_remove_pkt(struct virtio_vsock_pkt *pkt)
 {
@@ -577,6 +642,18 @@  virtio_transport_stream_dequeue(struct vsock_sock *vsk,
 }
 EXPORT_SYMBOL_GPL(virtio_transport_stream_dequeue);
 
+int
+virtio_transport_seqpacket_dequeue(struct vsock_sock *vsk,
+				   struct msghdr *msg,
+				   int flags, bool *msg_ready)
+{
+	if (flags & MSG_PEEK)
+		return -EOPNOTSUPP;
+
+	return virtio_transport_seqpacket_do_dequeue(vsk, msg, msg_ready);
+}
+EXPORT_SYMBOL_GPL(virtio_transport_seqpacket_dequeue);
+
 int
 virtio_transport_dgram_dequeue(struct vsock_sock *vsk,
 			       struct msghdr *msg,
@@ -658,14 +735,15 @@  EXPORT_SYMBOL_GPL(virtio_transport_do_socket_init);
 void virtio_transport_notify_buffer_size(struct vsock_sock *vsk, u64 *val)
 {
 	struct virtio_vsock_sock *vvs = vsk->trans;
+	int type;
 
 	if (*val > VIRTIO_VSOCK_MAX_BUF_SIZE)
 		*val = VIRTIO_VSOCK_MAX_BUF_SIZE;
 
 	vvs->buf_alloc = *val;
 
-	virtio_transport_send_credit_update(vsk, VIRTIO_VSOCK_TYPE_STREAM,
-					    NULL);
+	type = virtio_transport_get_type(sk_vsock(vsk));
+	virtio_transport_send_credit_update(vsk, type, NULL);
 }
 EXPORT_SYMBOL_GPL(virtio_transport_notify_buffer_size);
 
@@ -792,7 +870,6 @@  int virtio_transport_connect(struct vsock_sock *vsk)
 {
 	struct virtio_vsock_pkt_info info = {
 		.op = VIRTIO_VSOCK_OP_REQUEST,
-		.type = VIRTIO_VSOCK_TYPE_STREAM,
 		.vsk = vsk,
 	};
 
@@ -804,7 +881,6 @@  int virtio_transport_shutdown(struct vsock_sock *vsk, int mode)
 {
 	struct virtio_vsock_pkt_info info = {
 		.op = VIRTIO_VSOCK_OP_SHUTDOWN,
-		.type = VIRTIO_VSOCK_TYPE_STREAM,
 		.flags = (mode & RCV_SHUTDOWN ?
 			  VIRTIO_VSOCK_SHUTDOWN_RCV : 0) |
 			 (mode & SEND_SHUTDOWN ?
@@ -833,7 +909,6 @@  virtio_transport_stream_enqueue(struct vsock_sock *vsk,
 {
 	struct virtio_vsock_pkt_info info = {
 		.op = VIRTIO_VSOCK_OP_RW,
-		.type = VIRTIO_VSOCK_TYPE_STREAM,
 		.msg = msg,
 		.pkt_len = len,
 		.vsk = vsk,
@@ -856,7 +931,6 @@  static int virtio_transport_reset(struct vsock_sock *vsk,
 {
 	struct virtio_vsock_pkt_info info = {
 		.op = VIRTIO_VSOCK_OP_RST,
-		.type = VIRTIO_VSOCK_TYPE_STREAM,
 		.reply = !!pkt,
 		.vsk = vsk,
 	};
@@ -1001,7 +1075,7 @@  void virtio_transport_release(struct vsock_sock *vsk)
 	struct sock *sk = &vsk->sk;
 	bool remove_sock = true;
 
-	if (sk->sk_type == SOCK_STREAM)
+	if (sk->sk_type == SOCK_STREAM || sk->sk_type == SOCK_SEQPACKET)
 		remove_sock = virtio_transport_close(vsk);
 
 	list_for_each_entry_safe(pkt, tmp, &vvs->rx_queue, list) {
@@ -1164,7 +1238,6 @@  virtio_transport_send_response(struct vsock_sock *vsk,
 {
 	struct virtio_vsock_pkt_info info = {
 		.op = VIRTIO_VSOCK_OP_RESPONSE,
-		.type = VIRTIO_VSOCK_TYPE_STREAM,
 		.remote_cid = le64_to_cpu(pkt->hdr.src_cid),
 		.remote_port = le32_to_cpu(pkt->hdr.src_port),
 		.reply = true,