[v4,3/6] vdpa: Add vhost_vdpa_net_load_mq

Commit Message

Eugenio Perez Martin Sept. 6, 2022, 3:07 p.m. UTC

Same way as with the MAC, restore the expected number of queues at
device's start.

Signed-off-by: Eugenio Pérez <[e-mail]>
---
 net/vhost-vdpa.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

Patch

diff --git a/net/vhost-vdpa.c b/net/vhost-vdpa.c
index e799e744cd..3950e4f25d 100644
--- a/net/vhost-vdpa.c
+++ b/net/vhost-vdpa.c
@@ -400,6 +400,28 @@  static int vhost_vdpa_net_load_mac(VhostVDPAState *s, const VirtIONet *n)
     return 0;
 }
 
+static int vhost_vdpa_net_load_mq(VhostVDPAState *s,
+                                  const VirtIONet *n)
+{
+    struct virtio_net_ctrl_mq mq;
+    uint64_t features = n->parent_obj.guest_features;
+    ssize_t dev_written;
+
+    if (!(features & BIT_ULL(VIRTIO_NET_F_MQ))) {
+        return 0;
+    }
+
+    mq.virtqueue_pairs = cpu_to_le16(n->curr_queue_pairs);
+    dev_written = vhost_vdpa_net_load_cmd(s, VIRTIO_NET_CTRL_MQ,
+                                          VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, &mq,
+                                          sizeof(mq));
+    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);
@@ -418,6 +440,10 @@  static int vhost_vdpa_net_load(NetClientState *nc)
     if (unlikely(r < 0)) {
         return r;
     }
+    r = vhost_vdpa_net_load_mq(s, n);
+    if (unlikely(r)) {
+        return r;
+    }
 
     return 0;
 }