af_xdp: ensure at least one queue is created
Attempting to create an af_xdp interface with zerocopy where the
underlying driver didn't support it would lead to a crash due to
queue creation silently failing.
Type: fix
@@ -460,6 +460,8 @@ af_xdp_create_if (vlib_main_t * vm, af_xdp_create_if_args_t * args)
* requested 'max'
* we might create less tx queues than workers but this is ok
*/
+ af_xdp_log (VLIB_LOG_LEVEL_DEBUG, ad,
+ "create interface failed to create queue qid=%d", i);
/* fixup vectors length */
vec_set_len (ad->umem, i);
@@ -470,7 +472,8 @@ af_xdp_create_if (vlib_main_t * vm, af_xdp_create_if_args_t * args)
ad->rxq_num = clib_min (i, rxq_num);
ad->txq_num = clib_min (i, txq_num);
- if (i < rxq_num && AF_XDP_NUM_RX_QUEUES_ALL != args->rxq_num)
+ if (i == 0 ||
+ (i < rxq_num && AF_XDP_NUM_RX_QUEUES_ALL != args->rxq_num))
{
ad->rxq_num = ad->txq_num = 0;
goto err1; /* failed creating requested rxq: fatal error, bailing
