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Subject: Re: [virtio-dev] Re: [PATCH v2] virtio-i2c: add the device specification

On 2020/10/24 0:00, Michael S. Tsirkin wrote:

On Fri, Oct 23, 2020 at 02:51:25PM +0800, Jie Deng wrote:
+The driver queues requests to the virtqueues, and they are used by the
+device. The request is the representation of one segment of an I2C
+transaction. Each request is of form:
+struct virtio_i2c_req {
+        le16 addr;
+        le16 flags;
+        le16 len;
+        u8 buf[];
+        u8 status;
+The \field{addr} is the address of the I2C slave device.
+The first bit of \field{flags} indicates whether it is a read or write request.
+It means a read request if the first bit of \field{flags} is set, otherwise
+it is a write request. The rest bits of \field{flags} are reserved.

So how does one creates a multi-segment transaction then?

The I2C doesn't support segments numbering and sorting.
So if one creates a multi-segment transaction, then he/she should keep the segments in order.


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