VCC_MTU_SZ
if (uio_size < VCC_MTU_SZ) {
bytes = MIN(size, VCC_MTU_SZ);
attr.mtu = VCC_MTU_SZ;
ASSERT(space_left >= VCC_MTU_SZ);
while (space_left >= VCC_MTU_SZ) {
#define VCC_BUF_SZ (VCC_HDR_SZ + VCC_MTU_SZ)
uint8_t data[VCC_MTU_SZ]; /* data if type is data */