diff options
| -rw-r--r-- | net/vhost-vdpa.c | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/net/vhost-vdpa.c b/net/vhost-vdpa.c index c3ef0139a6..99d0445d90 100644 --- a/net/vhost-vdpa.c +++ b/net/vhost-vdpa.c @@ -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; } |