MCP251XFD_FIFO_TEF_NUM
static_assert(MCP251XFD_FIFO_TEF_NUM == 1U);
static_assert(MCP251XFD_FIFO_TEF_NUM == MCP251XFD_FIFO_TX_NUM);
struct mcp251xfd_tef_ring tef[MCP251XFD_FIFO_TEF_NUM];