[PATCH v4 4/8] vdpa: Avoid using vhost_vdpa_net_load_*() outside vhost_vdpa_net_load()

[Hawkins Jiawei]

Next patches in this series will refactor vhost_vdpa_net_load_cmd()
to iterate through the control commands shadow buffers, allowing QEMU
to send CVQ state load commands in parallel at device startup.

Considering that QEMU always forwards the CVQ command serialized
outside of vhost_vdpa_net_load(), it is more elegant to send the
CVQ commands directly without invoking vhost_vdpa_net_load_*() helpers.

Signed-off-by: Hawkins Jiawei <yin31149@gmail.com>
---
v4:
  - pack CVQ command by iov_from_buf() instead of accessing
`out` directly suggested by Eugenio

v3: 
https://lore.kernel.org/all/428a8fac2a29b37757fa15ca747be93c0226cb1f.1689748694.git.yin31149@gmail.com/

 net/vhost-vdpa.c | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/net/vhost-vdpa.c b/net/vhost-vdpa.c
index e6342b213f..7c67063469 100644
--- a/net/vhost-vdpa.c
+++ b/net/vhost-vdpa.c
@@ -1097,12 +1097,14 @@ static NetClientInfo net_vhost_vdpa_cvq_info = {
  */
 static int vhost_vdpa_net_excessive_mac_filter_cvq_add(VhostVDPAState *s,
                                                        VirtQueueElement *elem,
-                                                       struct iovec *out)
+                                                       struct iovec *out,
+                                                       const struct iovec *in)
 {
     struct virtio_net_ctrl_mac mac_data, *mac_ptr;
     struct virtio_net_ctrl_hdr *hdr_ptr;
     uint32_t cursor;
     ssize_t r;
+    uint8_t on = 1;
 
     /* parse the non-multicast MAC address entries from CVQ command */
     cursor = sizeof(*hdr_ptr);
@@ -1150,7 +1152,15 @@ static int 
vhost_vdpa_net_excessive_mac_filter_cvq_add(VhostVDPAState *s,
      * filter table to the vdpa device, it should send the
      * VIRTIO_NET_CTRL_RX_PROMISC CVQ command to enable promiscuous mode
      */
-    r = vhost_vdpa_net_load_rx_mode(s, VIRTIO_NET_CTRL_RX_PROMISC, 1);
+    cursor = 0;
+    hdr_ptr = out->iov_base;
+    out->iov_len = sizeof(*hdr_ptr) + sizeof(on);
+    assert(out->iov_len < vhost_vdpa_net_cvq_cmd_page_len());
+
+    hdr_ptr->class = VIRTIO_NET_CTRL_RX;
+    hdr_ptr->cmd = VIRTIO_NET_CTRL_RX_PROMISC;
+    iov_from_buf(out, 1, sizeof(*hdr_ptr), &on, sizeof(on));
+    r = vhost_vdpa_net_cvq_add(s, out, 1, in, 1);
     if (unlikely(r < 0)) {
         return r;
     }
@@ -1268,7 +1278,7 @@ static int 
vhost_vdpa_net_handle_ctrl_avail(VhostShadowVirtqueue *svq,
          * the CVQ command direclty.
          */
         dev_written = vhost_vdpa_net_excessive_mac_filter_cvq_add(s, elem,
-                                                                  &out);
+                                                            &out, &vdpa_in);
         if (unlikely(dev_written < 0)) {
             goto out;
         }
-- 
2.25.1