b0->desc_index = cur_slot;
b0->data = memif_get_buffer (c, ring, cur_slot & mask);
b0->len = ring->desc[cur_slot & mask].length;
b0->desc_index = cur_slot;
b0->data = memif_get_buffer (c, ring, cur_slot & mask);
b0->len = ring->desc[cur_slot & mask].length;