vec_validate_aligned (vif->txq_vrings, TX_QUEUE_ACCESS (idx),
CLIB_CACHE_LINE_BYTES);
vring = vec_elt_at_index (vif->txq_vrings, TX_QUEUE_ACCESS (idx));
vec_validate_aligned (vif->txq_vrings, TX_QUEUE_ACCESS (idx),
CLIB_CACHE_LINE_BYTES);
vring = vec_elt_at_index (vif->txq_vrings, TX_QUEUE_ACCESS (idx));