> Regarding type, it’s needed, especially for the in packets. There are two > distinct kinds of incoming > packets: notification‑in and reply‑in. Because of that differences, Combining > cmd and type would > blur that distinction and complicate the implementation.
[Goes and looks at gpio-virtio] https://elixir.bootlin.com/linux/v6.19.3/source/include/uapi/linux/virtio_gpio.h#L13 /* Virtio GPIO request types */ #define VIRTIO_GPIO_MSG_GET_NAMES 0x0001 #define VIRTIO_GPIO_MSG_GET_DIRECTION 0x0002 #define VIRTIO_GPIO_MSG_SET_DIRECTION 0x0003 #define VIRTIO_GPIO_MSG_GET_VALUE 0x0004 #define VIRTIO_GPIO_MSG_SET_VALUE 0x0005 #define VIRTIO_GPIO_MSG_IRQ_TYPE 0x0006 Andrew
