Re: [RFC PATCH v4 10/17] vhost/vsock: support MSG_ZEROCOPY for transport

From: Stefano Garzarella
Date: Mon Jun 26 2023 - 12:12:07 EST


On Sat, Jun 03, 2023 at 11:49:32PM +0300, Arseniy Krasnov wrote:
Add 'msgzerocopy_allow()' callback for vhost transport.

Signed-off-by: Arseniy Krasnov <AVKrasnov@xxxxxxxxxxxxxx>
---
drivers/vhost/vsock.c | 6 ++++++
1 file changed, 6 insertions(+)

diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c
index b254aa4b756a..318866713ef7 100644
--- a/drivers/vhost/vsock.c
+++ b/drivers/vhost/vsock.c
@@ -396,6 +396,11 @@ static bool vhost_vsock_more_replies(struct vhost_vsock *vsock)
return val < vq->num;
}

+static bool vhost_transport_msgzerocopy_allow(void)
+{
+ return true;
+}
+
static bool vhost_transport_seqpacket_allow(u32 remote_cid);

static struct virtio_transport vhost_transport = {
@@ -442,6 +447,7 @@ static struct virtio_transport vhost_transport = {
.notify_buffer_size = virtio_transport_notify_buffer_size,

.read_skb = virtio_transport_read_skb,
+ .msgzerocopy_allow = vhost_transport_msgzerocopy_allow,

Can we move this after .seqpacket section?

},

.send_pkt = vhost_transport_send_pkt,
--
2.25.1