[Qemu-devel] [PATCH 5/7] vhost_net: move vhost_net_set_vq_index ahead at vhost_net_init

[Yuanhan Liu]

So that we could use the `vq_index' as well in the vhost_net_init
stage, which is required when adding vhost-user multiple-queue support,
where we need the vq_index to indicate which queue pair we are gonna
initiate.

vhost-user has no multiple queue support yet, hence no queue_index set
before. Here is a quick set to 0 at net_vhost_user_init() stage, and it
will be set properly soon in the next patch.

Signed-off-by: Yuanhan Liu <yuanhan....@linux.intel.com>
---
 hw/net/vhost_net.c | 16 +++++++---------
 net/vhost-user.c   |  1 +
 2 files changed, 8 insertions(+), 9 deletions(-)

diff --git a/hw/net/vhost_net.c b/hw/net/vhost_net.c
index f9441e9..141b557 100644
--- a/hw/net/vhost_net.c
+++ b/hw/net/vhost_net.c
@@ -138,6 +138,11 @@ static int vhost_net_get_fd(NetClientState *backend)
     }
 }
 
+static void vhost_net_set_vq_index(struct vhost_net *net, int vq_index)
+{
+    net->dev.vq_index = vq_index;
+}
+
 struct vhost_net *vhost_net_init(VhostNetOptions *options)
 {
     int r;
@@ -167,6 +172,8 @@ struct vhost_net *vhost_net_init(VhostNetOptions *options)
     }
     net->nc = options->net_backend;
 
+    vhost_net_set_vq_index(net, net->nc->queue_index * 2);
+
     net->dev.nvqs = 2;
     net->dev.vqs = net->vqs;
 
@@ -196,11 +203,6 @@ fail:
     return NULL;
 }
 
-static void vhost_net_set_vq_index(struct vhost_net *net, int vq_index)
-{
-    net->dev.vq_index = vq_index;
-}
-
 static int vhost_net_set_vnet_endian(VirtIODevice *dev, NetClientState *peer,
                                      bool set)
 {
@@ -325,10 +327,6 @@ int vhost_net_start(VirtIODevice *dev, NetClientState *ncs,
         goto err;
     }
 
-    for (i = 0; i < total_queues; i++) {
-        vhost_net_set_vq_index(get_vhost_net(ncs[i].peer), i * 2);
-    }
-
     r = k->set_guest_notifiers(qbus->parent, total_queues * 2, true);
     if (r < 0) {
         error_report("Error binding guest notifier: %d", -r);
diff --git a/net/vhost-user.c b/net/vhost-user.c
index 93dcecd..2d6bbe5 100644
--- a/net/vhost-user.c
+++ b/net/vhost-user.c
@@ -146,6 +146,7 @@ static int net_vhost_user_init(NetClientState *peer, const 
char *device,
     /* We don't provide a receive callback */
     s->nc.receive_disabled = 1;
     s->chr = chr;
+    nc->queue_index = 0;
 
     qemu_chr_add_handlers(s->chr, NULL, NULL, net_vhost_user_event, s);
 
-- 
1.9.0