MIN_BUF_SIZE
ASSERT(msz >= MIN_BUF_SIZE);
vq_pushchain(ring, MAX(copied, MIN_BUF_SIZE + hdr_sz), cookie);
ASSERT(msz >= MIN_BUF_SIZE);
#define NEED_VLAN_PAD_SIZE (MIN_BUF_SIZE - VLAN_TAGSZ)
} else if (size < MIN_BUF_SIZE) {
const size_t pad_size = MIN_BUF_SIZE - size;