[PATCH 1/2] vdpa: Add vhost_vdpa_net_load_offloads

[Hawkins Jiawei]

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

Signed-off-by: Hawkins Jiawei <yin31149@gmail.com>
---
 net/vhost-vdpa.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/net/vhost-vdpa.c b/net/vhost-vdpa.c
index 37cdc84562..682c749b19 100644
--- a/net/vhost-vdpa.c
+++ b/net/vhost-vdpa.c
@@ -680,6 +680,28 @@ 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 features, offloads;
+    ssize_t dev_written;
+
+    features = n->parent_obj.guest_features;
+    if (!(features & BIT_ULL(VIRTIO_NET_F_CTRL_GUEST_OFFLOADS))) {
+        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);
@@ -702,6 +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;
 }
-- 
2.25.1