commit ce21599c8af34a3f9da813a3c953a38a16316b4d
author Mohsin Kazmi <sykazmi@cisco.com> Fri Apr 10 14:57:06 2020 +0000
committer Damjan Marion <dmarion@me.com> Fri Apr 17 16:36:45 2020 +0000
tree 7ac332437239cf76d90d9e56d8cc82723ac301d0
parent 82fc98fa4578dbbfb156effb11dea6a4e2d0b898

virtio: fix to use chained descriptors when missing indirect descriptor

Some vhost-backed missing the VIRTIO_RING_F_INDIRECT_DESC feature.
Previously, vpp doesn't support jumbo frames using chained descriptors.
This patch fixes this issue.

Type: fix

Change-Id: I20487e201e88ea136b556ac84dde058019ab3e78
Signed-off-by: Mohsin Kazmi <sykazmi@cisco.com>

src/vnet/devices/virtio/pci.c

diff --git a/src/vnet/devices/virtio/pci.c b/src/vnet/devices/virtio/pci.c
index 5482822..c7398c9 100644
--- a/src/vnet/devices/virtio/pci.c
+++ b/src/vnet/devices/virtio/pci.c
@@ -1052,6 +1052,17 @@
    * read device features and negotiate (user) requested features
    */
   virtio_pci_read_device_feature (vm, vif);
+  if ((vif->remote_features & VIRTIO_FEATURE (VIRTIO_RING_F_INDIRECT_DESC)) ==
+      0)
+    {
+      virtio_log_warning (vif, "error encountered: vhost-net backend doesn't "
+			  "support VIRTIO_RING_F_INDIRECT_DESC features");
+    }
+  if ((vif->remote_features & VIRTIO_FEATURE (VIRTIO_NET_F_MRG_RXBUF)) == 0)
+    {
+      virtio_log_warning (vif, "error encountered: vhost-net backend doesn't "
+			  "support VIRTIO_NET_F_MRG_RXBUF features");
+    }
   virtio_negotiate_features (vm, vif, args->features);
 
   /*