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vdpa: Add vhost_vdpa_net_load_offloads()

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This patch introduces vhost_vdpa_net_load_offloads() to
restore offloads state at device's startup.

Signed-off-by: Hawkins Jiawei <yin31149@gmail.com>
Message-Id: <7e2b5cad9c48c917df53d80dec27dbfeb513e1a3.1685704856.git.yin31149@gmail.com>
Tested-by: Lei Yang <leiyang@redhat.com>
Reviewed-by: Eugenio Pérez <eperezma@redhat.com>
Tested-by: Eugenio Pérez <eperezma@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Hawkins Jiawei 2023-06-02 19:52:17 +08:00 committed by Michael S. Tsirkin
parent 0b545b1e42
commit 0b58d3686a
1 changed files with 42 additions and 0 deletions
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42
net/vhost-vdpa.c
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@ -664,6 +664,44 @@ static int vhost_vdpa_net_load_mq(VhostVDPAState *s,
return *s->status != VIRTIO_NET_OK;
}
static int vhost_vdpa_net_load_offloads(VhostVDPAState *s,
const VirtIONet *n)
{
uint64_t offloads;
ssize_t dev_written;
if (!virtio_vdev_has_feature(&n->parent_obj,
VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) {
return 0;
}
if (n->curr_guest_offloads == virtio_net_supported_guest_offloads(n)) {
/*
* According to VirtIO standard, "Upon feature negotiation
* corresponding offload gets enabled to preserve
* backward compatibility.".
*
* Therefore, there is no need to send this CVQ command if the
* driver also enables all supported offloads, which aligns with
* the device's defaults.
*
* Note that the device's defaults can mismatch the driver's
* configuration only at live migration.
*/
return 0;
}
offloads = cpu_to_le64(n->curr_guest_offloads);
dev_written = vhost_vdpa_net_load_cmd(s, VIRTIO_NET_CTRL_GUEST_OFFLOADS,
VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET,
&offloads, sizeof(offloads));
if (unlikely(dev_written < 0)) {
return dev_written;
}
return *s->status != VIRTIO_NET_OK;
}
static int vhost_vdpa_net_load(NetClientState *nc)
{
VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc);
@ -686,6 +724,10 @@ static int vhost_vdpa_net_load(NetClientState *nc)
if (unlikely(r)) {
return r;
}
r = vhost_vdpa_net_load_offloads(s, n);
if (unlikely(r)) {
return r;
}
return 0;
}