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From: Arseny Krasnov <arseny.krasnov@kaspersky.com>
To: Stefan Hajnoczi <stefanha@redhat.com>,
	Stefano Garzarella <sgarzare@redhat.com>,
	"Michael S. Tsirkin" <mst@redhat.com>,
	Jason Wang <jasowang@redhat.com>,
	"David S. Miller" <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>,
	Arseny Krasnov <arseny.krasnov@kaspersky.com>,
	Colin Ian King <colin.king@canonical.com>,
	Andra Paraschiv <andraprs@amazon.com>,
	Jeff Vander Stoep <jeffv@google.com>
Cc: <kvm@vger.kernel.org>,
	<virtualization@lists.linux-foundation.org>,
	<netdev@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
	<stsp2@yandex.ru>, <oxffffaa@gmail.com>
Subject: [RFC PATCH v2 09/13] virtio/vsock: implement fetch of record length
Date: Fri, 15 Jan 2021 08:43:49 +0300	[thread overview]
Message-ID: <20210115054352.1456795-1-arseny.krasnov@kaspersky.com> (raw)
In-Reply-To: <20210115053553.1454517-1-arseny.krasnov@kaspersky.com>

This adds transport callback which tries to fetch record begin marker from
socket's rx queue. It is called from af_vsock.c before reading data
packets of record.

Signed-off-by: Arseny Krasnov <arseny.krasnov@kaspersky.com>
---
 include/linux/virtio_vsock.h            |  1 +
 net/vmw_vsock/virtio_transport_common.c | 33 +++++++++++++++++++++++++
 2 files changed, 34 insertions(+)

diff --git a/include/linux/virtio_vsock.h b/include/linux/virtio_vsock.h
index 7f0ef5204e33..af8705ea8b95 100644
--- a/include/linux/virtio_vsock.h
+++ b/include/linux/virtio_vsock.h
@@ -84,6 +84,7 @@ virtio_transport_dgram_dequeue(struct vsock_sock *vsk,
 			       struct msghdr *msg,
 			       size_t len, int flags);
 
+size_t virtio_transport_seqpacket_seq_get_len(struct vsock_sock *vsk);
 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 4328f653a477..fe1272e74517 100644
--- a/net/vmw_vsock/virtio_transport_common.c
+++ b/net/vmw_vsock/virtio_transport_common.c
@@ -420,6 +420,39 @@ static size_t virtio_transport_drop_until_seq_begin(struct virtio_vsock_sock *vv
 	return bytes_dropped;
 }
 
+size_t virtio_transport_seqpacket_seq_get_len(struct vsock_sock *vsk)
+{
+	struct virtio_vsock_sock *vvs = vsk->trans;
+	struct virtio_vsock_pkt *pkt;
+	size_t bytes_dropped;
+
+	spin_lock_bh(&vvs->rx_lock);
+
+	/* Fetch all orphaned 'RW', packets, and
+	 * send credit update.
+	 */
+	bytes_dropped = virtio_transport_drop_until_seq_begin(vvs);
+
+	if (list_empty(&vvs->rx_queue))
+		goto out;
+
+	pkt = list_first_entry(&vvs->rx_queue, struct virtio_vsock_pkt, list);
+
+	vvs->user_read_copied = 0;
+	vvs->user_read_seq_len = le32_to_cpu(pkt->hdr.flags);
+	virtio_transport_del_n_free_pkt(pkt);
+out:
+	spin_unlock_bh(&vvs->rx_lock);
+
+	if (bytes_dropped)
+		virtio_transport_send_credit_update(vsk,
+						    VIRTIO_VSOCK_TYPE_SEQPACKET,
+						    NULL);
+
+	return vvs->user_read_seq_len;
+}
+EXPORT_SYMBOL_GPL(virtio_transport_seqpacket_seq_get_len);
+
 static ssize_t virtio_transport_seqpacket_do_dequeue(struct vsock_sock *vsk,
 						     struct msghdr *msg,
 						     size_t user_buf_len)
-- 
2.25.1


  parent reply	other threads:[~2021-01-15  5:45 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-15  5:35 [RFC PATCH v2 00/13] virtio/vsock: introduce SOCK_SEQPACKET support Arseny Krasnov
2021-01-15  5:40 ` [RFC PATCH v2 01/13] af_vsock: implement 'vsock_wait_data()' Arseny Krasnov
2021-01-18 14:51   ` Stefano Garzarella
2021-01-15  5:40 ` [RFC PATCH v2 02/13] af_vsock: separate rx loops for STREAM/SEQPACKET Arseny Krasnov
2021-01-18 15:04   ` Stefano Garzarella
2021-01-15  5:41 ` [RFC PATCH v2 03/13] af_vsock: implement rx loops entry point Arseny Krasnov
2021-01-15  5:41 ` [RFC PATCH v2 04/13] af_vsock: replace previous stream rx loop Arseny Krasnov
2021-01-15  5:42 ` [RFC PATCH v2 05/13] af_vsock: implement send logic for SOCK_SEQPACKET Arseny Krasnov
2021-01-15  5:42 ` [RFC PATCH v2 06/13] af_vsock: general support of SOCK_SEQPACKET type Arseny Krasnov
2021-01-18 15:12   ` Stefano Garzarella
2021-01-15  5:42 ` [RFC PATCH v2 07/13] af_vsock: update comments for stream sockets Arseny Krasnov
2021-01-15  5:43 ` [RFC PATCH v2 08/13] virtio/vsock: dequeue callback for SOCK_SEQPACKET Arseny Krasnov
2021-01-18 15:14   ` Stefano Garzarella
2021-01-15  5:43 ` Arseny Krasnov [this message]
2021-01-15  5:44 ` [RFC PATCH v2 10/13] virtio/vsock: update receive logic Arseny Krasnov
2021-01-18 15:15   ` Stefano Garzarella
2021-01-15  5:44 ` [RFC PATCH v2 11/13] virtio/vsock: rest of SOCK_SEQPACKET support Arseny Krasnov
2021-01-18 15:15   ` Stefano Garzarella
2021-01-15  5:45 ` [RFC PATCH v2 12/13] vhost/vsock: support for SOCK_SEQPACKET socket Arseny Krasnov
2021-01-15  5:45 ` [RFC PATCH v2 13/13] vsock_test: add SOCK_SEQPACKET tests Arseny Krasnov
2021-01-15  9:59 ` [RFC PATCH v2 00/13] virtio/vsock: introduce SOCK_SEQPACKET support stsp
2021-01-18 15:16   ` Stefano Garzarella

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