[virtio-dev] Re: [virtio-comment] [PATCH] [PATCH v5] virtio-spi: add the device specification

On 29-11-23, 18:31, Haixu Cui wrote:
> Hi Viresh,
> 
>     Thank you for your helpful comments. In next patch, I will clearly point
> this out:

Great, finally we are on the same page. Thanks Haixu.

>     "For full-duplex read and write transfer, both \field{tx_buf} and
> \field{rx_buf} are used and the buffer size of \field{tx_buf} must be same
> as \field{rx_buf}."

Suggest rewriting as:

In full-duplex transfer mode, both \field{tx_buf} and \field{rx_buf} are sent by
the driver, \field{tx_buf} followed by \field{rx_buf}. The length of both the
buffers MUST be same.

>     And in drivernormative section, I will add a requirement:
>     "For full-duplex transfer, Virtio SPI driver MUST guarantee the write
> transfer size is equal to the read transfer size"

Maybe:

drivernormative:

In full-duplex transfer mode, the Virtio SPI driver MUST guarantee that the
length of both \field{tx_buf} and \field{rx_buf} are same.

devicenormative:

In full-duplex transfer mode, the Virtio SPI device MUST verify that the length
of both \field{tx_buf} and \field{rx_buf} are same. In case of any mismatch, the
device MUST fail the transfer and notify the driver.

>     In fact, in my prototype, I only perform the transfers with same tx/rx
> length.

Great.

Thanks.

-- 
viresh

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