MCP251XFD_FIFO_RX_NUM
.fifo_num = MCP251XFD_FIFO_RX_NUM,
#define MCP251XFD_RX_OBJ_NUM_MAX (MCP251XFD_FIFO_RX_NUM * MCP251XFD_FIFO_DEPTH)
static_assert(MCP251XFD_FIFO_RX_NUM <= 4U);
struct mcp251xfd_rx_ring *rx[MCP251XFD_FIFO_RX_NUM];