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Date: Wed, 11 Aug 2021 11:00:30 +0200
From: Stefano Garzarella <sgarzare@...hat.com>
To: Arseny Krasnov <arseny.krasnov@...persky.com>
Cc: Stefan Hajnoczi <stefanha@...hat.com>,
"Michael S. Tsirkin" <mst@...hat.com>,
Jason Wang <jasowang@...hat.com>,
"David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>,
Colin Ian King <colin.king@...onical.com>,
Norbert Slusarek <nslusarek@....net>,
Andra Paraschiv <andraprs@...zon.com>, kvm@...r.kernel.org,
virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org, stsp2@...dex.ru, oxffffaa@...il.com
Subject: Re: [RFC PATCH v2 1/5] virtio/vsock: add 'VIRTIO_VSOCK_SEQ_EOM' bit
On Tue, Aug 10, 2021 at 02:39:53PM +0300, Arseny Krasnov wrote:
The title is confusing, we are renaming EOR in EOM.
>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@...persky.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,
^
I think is better to add this new flag in a separate patch.
> };
>
> #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
>
The rest LGTM!
Thanks,
Stefano
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