[RFC v2 05/11] virtio: Fill .next in tx queue

["Eugenio Pérez" <eperezma@redhat.com>]

This way we can send one frame splitted in many buffers. TCP stack
already works this way in pasta.

Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
---
 tap.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tap.c b/tap.c
index 8b3ec45..5667fbe 100644
--- a/tap.c
+++ b/tap.c
@@ -1727,6 +1727,9 @@ static int tap_ns_tun(void *arg)
 		vring_desc[0][i].len = PKT_BUF_BYTES/VHOST_NDESCS;
 		vring_desc[0][i].flags = VRING_DESC_F_WRITE;
 	}
+	for (i = 0; i < (VHOST_NDESCS - 1); ++i) {
+		vring_desc[1][i].next = i+1;
+	}
 	for (i = 0; i < VHOST_NDESCS; ++i) {
 		vring_avail_0.avail.ring[i] = i;
 	}
-- 
@@ -1727,6 +1727,9 @@ static int tap_ns_tun(void *arg)
 		vring_desc[0][i].len = PKT_BUF_BYTES/VHOST_NDESCS;
 		vring_desc[0][i].flags = VRING_DESC_F_WRITE;
 	}
+	for (i = 0; i < (VHOST_NDESCS - 1); ++i) {
+		vring_desc[1][i].next = i+1;
+	}
 	for (i = 0; i < VHOST_NDESCS; ++i) {
 		vring_avail_0.avail.ring[i] = i;
 	}
-- 
2.50.0