vhost: fix build with kernel < 3.5

VIRTIO_NET_F_GUEST_ANNOUNCE is a new feature introduced since kernel
v3.5. For older kernels (or more precisely, old distributions), we
could simply define it manually, to fix the "macro not defined" error.

Fixes: d293dac8f30e ("vhost: claim support of guest announce")
Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>

diff --git a/lib/librte_vhost/rte_virtio_net.h b/lib/librte_vhost/rte_virtio_net.h
index 7d1fde202572736c71ca58ef160adf68eec02b2a..443245dc6864e457977eb04a5ee43e076c74066a 100644 (file)
--- a/lib/librte_vhost/rte_virtio_net.h
+++ b/lib/librte_vhost/rte_virtio_net.h
@@ -97,6 +97,11 @@ struct vhost_virtqueue {
        struct buf_vector       buf_vec[BUF_VECTOR_MAX];        /**< for scatter RX. */
 } __rte_cache_aligned;
 
+/* Old kernels have no such macro defined */
+#ifndef VIRTIO_NET_F_GUEST_ANNOUNCE
+ #define VIRTIO_NET_F_GUEST_ANNOUNCE 21
+#endif
+
 
 /*
  * Make an extra wrapper for VIRTIO_NET_F_MQ and