Maximum QMI request size?

[ttuttle]

The theoretical maximum size is a little over 64k, since the length field
is 16 bits.  I think it would make sense to use that as a maximum in the
kernel.
On Aug 19, 2012 3:40 PM, "Bjørn Mork" <bjorn at mork.no> wrote:

> Did anyone ever see a definite QMI message size specification? The
> qmi_wwan driver currently uses 512 bytes, but I do not remember where I
> got that from...
>
> Anyway, I am suspecting that it should be increased. I've been
> experimenting with injecting XTRA data to speed up GPS aquisition.
> Uploading chunks exceeding the driver message size (i.e. splitting the
> chunks in several USB control messages) does not seem to work.  If I
> increase the driver message limit to 2048 bytes, I can successfully
> upload the XTRA database in 1536 byte chunks (which seems to be maximum
> supported).
>
> So I guess I should make this change to the driver, unless I was doing
> something wrong here.  Has anyone else experimented with sending QMI
> messages > 512 bytes?
>
> But it would nice to quote a reference when making this change.
> Changing one arbitrary number for another arbitrary number looks bad.
>
>
> Bjørn
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>
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