tapv2: Sporadic SIGABRT in ethernet_input [VPP-1183]
virtio_free_rx_buffers uses the wrong slot in the vring to get
the buffer index. It uses desc_next. It should be last_used_idx
which is the slot number for the first valid descriptor.
Change-Id: I6b62b794f06869fbffffce45430b8b2e37b1266c
Signed-off-by: Steven <sluong@cisco.com>
diff --git a/src/vnet/devices/tap/cli.c b/src/vnet/devices/tap/cli.c
index c17599a..9d86159 100644
--- a/src/vnet/devices/tap/cli.c
+++ b/src/vnet/devices/tap/cli.c
@@ -265,8 +265,9 @@
// RX = 0, TX = 1
vring = vec_elt_at_index (vif->vrings, i);
vlib_cli_output (vm, " Virtqueue (%s)", (i & 1) ? "TX" : "RX");
- vlib_cli_output (vm, " qsz %d, last_used_idx %d, desc_in_use %d",
- vring->size, vring->last_used_idx,
+ vlib_cli_output (vm,
+ " qsz %d, last_used_idx %d, desc_next %d, desc_in_use %d",
+ vring->size, vring->last_used_idx, vring->desc_next,
vring->desc_in_use);
vlib_cli_output (vm,
" avail.flags 0x%x avail.idx %d used.flags 0x%x used.idx %d",
diff --git a/src/vnet/devices/virtio/virtio.c b/src/vnet/devices/virtio/virtio.c
index aa9db3a..072e8a7 100644
--- a/src/vnet/devices/virtio/virtio.c
+++ b/src/vnet/devices/virtio/virtio.c
@@ -140,13 +140,13 @@
virtio_free_rx_buffers (vlib_main_t * vm, virtio_vring_t * vring)
{
u16 used = vring->desc_in_use;
- u16 next = vring->desc_next;
+ u16 last = vring->last_used_idx;
u16 mask = vring->size - 1;
while (used)
{
- vlib_buffer_free (vm, &vring->buffers[next], 1);
- next = (next + 1) & mask;
+ vlib_buffer_free (vm, &vring->buffers[last & mask], 1);
+ last++;
used--;
}
}