[PATCH v4 5/6] vdpa: Add vhost_vdpa_net_load_offloads()

[Hawkins Jiawei <yin31149@gmail.com>]

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 | 42 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)

diff --git a/net/vhost-vdpa.c b/net/vhost-vdpa.c
index e907a3c792..1a295af51d 100644
--- a/net/vhost-vdpa.c
+++ b/net/vhost-vdpa.c
@@ -678,6 +678,44 @@ 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);
@@ -700,6 +738,10 @@ 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