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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>,
	Norbert Slusarek <nslusarek@gmx.net>,
	Andra Paraschiv <andraprs@amazon.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 1/5] virtio/vsock: add 'VIRTIO_VSOCK_SEQ_EOM' bit
Date: Tue, 10 Aug 2021 14:39:53 +0300	[thread overview]
Message-ID: <20210810113956.1214463-1-arseny.krasnov@kaspersky.com> (raw)
In-Reply-To: <20210810113901.1214116-1-arseny.krasnov@kaspersky.com>

This bit is used to mark end of messages('EOM' - end of message), while
'VIRIO_VSOCK_SEQ_EOR' is used to pass MSG_EOR. Also rename 'record' to
'message' in implementation as it is different things.

Signed-off-by: Arseny Krasnov <arseny.krasnov@kaspersky.com>
---
 drivers/vhost/vsock.c                   | 12 ++++++------
 include/uapi/linux/virtio_vsock.h       |  3 ++-
 net/vmw_vsock/virtio_transport_common.c | 14 +++++++-------
 3 files changed, 15 insertions(+), 14 deletions(-)

diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c
index f249622ef11b..feaf650affbe 100644
--- a/drivers/vhost/vsock.c
+++ b/drivers/vhost/vsock.c
@@ -178,15 +178,15 @@ vhost_transport_do_send_pkt(struct vhost_vsock *vsock,
 			 * small rx buffers, headers of packets in rx queue are
 			 * created dynamically and are initialized with header
 			 * of current packet(except length). But in case of
-			 * SOCK_SEQPACKET, we also must clear record delimeter
-			 * bit(VIRTIO_VSOCK_SEQ_EOR). Otherwise, instead of one
-			 * packet with delimeter(which marks end of record),
+			 * SOCK_SEQPACKET, we also must clear message delimeter
+			 * bit(VIRTIO_VSOCK_SEQ_EOM). Otherwise, instead of one
+			 * packet with delimeter(which marks end of message),
 			 * there will be sequence of packets with delimeter
 			 * bit set. After initialized header will be copied to
 			 * rx buffer, this bit will be restored.
 			 */
-			if (le32_to_cpu(pkt->hdr.flags) & VIRTIO_VSOCK_SEQ_EOR) {
-				pkt->hdr.flags &= ~cpu_to_le32(VIRTIO_VSOCK_SEQ_EOR);
+			if (le32_to_cpu(pkt->hdr.flags) & VIRTIO_VSOCK_SEQ_EOM) {
+				pkt->hdr.flags &= ~cpu_to_le32(VIRTIO_VSOCK_SEQ_EOM);
 				restore_flag = true;
 			}
 		}
@@ -225,7 +225,7 @@ vhost_transport_do_send_pkt(struct vhost_vsock *vsock,
 		 */
 		if (pkt->off < pkt->len) {
 			if (restore_flag)
-				pkt->hdr.flags |= cpu_to_le32(VIRTIO_VSOCK_SEQ_EOR);
+				pkt->hdr.flags |= cpu_to_le32(VIRTIO_VSOCK_SEQ_EOM);
 
 			/* We are queueing the same virtio_vsock_pkt to handle
 			 * the remaining bytes, and we want to deliver it
diff --git a/include/uapi/linux/virtio_vsock.h b/include/uapi/linux/virtio_vsock.h
index 3dd3555b2740..64738838bee5 100644
--- a/include/uapi/linux/virtio_vsock.h
+++ b/include/uapi/linux/virtio_vsock.h
@@ -97,7 +97,8 @@ enum virtio_vsock_shutdown {
 
 /* VIRTIO_VSOCK_OP_RW flags values */
 enum virtio_vsock_rw {
-	VIRTIO_VSOCK_SEQ_EOR = 1,
+	VIRTIO_VSOCK_SEQ_EOM = 1,
+	VIRTIO_VSOCK_SEQ_EOR = 2,
 };
 
 #endif /* _UAPI_LINUX_VIRTIO_VSOCK_H */
diff --git a/net/vmw_vsock/virtio_transport_common.c b/net/vmw_vsock/virtio_transport_common.c
index 081e7ae93cb1..4d5a93beceb0 100644
--- a/net/vmw_vsock/virtio_transport_common.c
+++ b/net/vmw_vsock/virtio_transport_common.c
@@ -77,7 +77,7 @@ virtio_transport_alloc_pkt(struct virtio_vsock_pkt_info *info,
 
 		if (msg_data_left(info->msg) == 0 &&
 		    info->type == VIRTIO_VSOCK_TYPE_SEQPACKET)
-			pkt->hdr.flags |= cpu_to_le32(VIRTIO_VSOCK_SEQ_EOR);
+			pkt->hdr.flags |= cpu_to_le32(VIRTIO_VSOCK_SEQ_EOM);
 	}
 
 	trace_virtio_transport_alloc_pkt(src_cid, src_port,
@@ -457,7 +457,7 @@ static int virtio_transport_seqpacket_do_dequeue(struct vsock_sock *vsk,
 				dequeued_len += pkt_len;
 		}
 
-		if (le32_to_cpu(pkt->hdr.flags) & VIRTIO_VSOCK_SEQ_EOR) {
+		if (le32_to_cpu(pkt->hdr.flags) & VIRTIO_VSOCK_SEQ_EOM) {
 			msg_ready = true;
 			vvs->msg_count--;
 		}
@@ -1029,7 +1029,7 @@ virtio_transport_recv_enqueue(struct vsock_sock *vsk,
 		goto out;
 	}
 
-	if (le32_to_cpu(pkt->hdr.flags) & VIRTIO_VSOCK_SEQ_EOR)
+	if (le32_to_cpu(pkt->hdr.flags) & VIRTIO_VSOCK_SEQ_EOM)
 		vvs->msg_count++;
 
 	/* Try to copy small packets into the buffer of last packet queued,
@@ -1044,12 +1044,12 @@ virtio_transport_recv_enqueue(struct vsock_sock *vsk,
 
 		/* If there is space in the last packet queued, we copy the
 		 * new packet in its buffer. We avoid this if the last packet
-		 * queued has VIRTIO_VSOCK_SEQ_EOR set, because this is
-		 * delimiter of SEQPACKET record, so 'pkt' is the first packet
-		 * of a new record.
+		 * queued has VIRTIO_VSOCK_SEQ_EOM set, because this is
+		 * delimiter of SEQPACKET message, so 'pkt' is the first packet
+		 * of a new message.
 		 */
 		if ((pkt->len <= last_pkt->buf_len - last_pkt->len) &&
-		    !(le32_to_cpu(last_pkt->hdr.flags) & VIRTIO_VSOCK_SEQ_EOR)) {
+		    !(le32_to_cpu(last_pkt->hdr.flags) & VIRTIO_VSOCK_SEQ_EOM)) {
 			memcpy(last_pkt->buf + last_pkt->len, pkt->buf,
 			       pkt->len);
 			last_pkt->len += pkt->len;
-- 
2.25.1


  reply	other threads:[~2021-08-10 11:40 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-10 11:38 [RFC PATCH v2 0/5] virtio/vsock: introduce MSG_EOR flag for SEQPACKET Arseny Krasnov
2021-08-10 11:39 ` Arseny Krasnov [this message]
2021-08-11  9:00   ` [RFC PATCH v2 1/5] virtio/vsock: add 'VIRTIO_VSOCK_SEQ_EOM' bit Stefano Garzarella
2021-08-10 11:40 ` [RFC PATCH v2 2/5] vhost/vsock: support MSG_EOR bit processing Arseny Krasnov
2021-08-11  9:06   ` Stefano Garzarella
2021-08-10 11:40 ` [RFC PATCH v2 3/5] virito/vsock: " Arseny Krasnov
2021-08-11  9:09   ` Stefano Garzarella
2021-08-10 11:41 ` [RFC PATCH v2 4/5] af_vsock: rename variables in receive loop Arseny Krasnov
2021-08-11  9:09   ` Stefano Garzarella
2021-08-10 11:41 ` [RFC PATCH v2 5/5] vsock_test: update message bounds test for MSG_EOR Arseny Krasnov
2021-08-11  9:12   ` Stefano Garzarella

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