+ USWG
Thanks for your insight, Feng. Note that I don't subscribe to the USWG so
please include me in responses. I am developing a protocol stack based off the
USB device that needs the continuous bulk pipe read pump.
Thanks,
-Ilya
From: [email protected]
To: [email protected]
Date: Wed, 30 Apr 2014 00:29:07 +0000
Subject: Re: [edk2] Asynchronous USB bulk?
I agree with you that adding an async bulk transfer would be valuable for some
user cases, especially for usb network device.
As it involves UEFI interface change, it would be better to raise it to UEFI
USWG (UEFI Spec Working Group <[email protected]>).
Thanks
Feng
From: Ilya Faenson [mailto:[email protected]]
Sent: Tuesday, April 29, 2014 23:13
To: [email protected]
Subject: [edk2] Asynchronous USB bulk?
I suspect it should be in the FAQ but I don't happen to see any clarifications
to this extent. How come the EFI_USB_IO_PROTOCOL features the asynchronous
functions
to receive over the interrupt (UsbAsyncInterruptTransfer) and iso
(UsbAsyncIsochronousTransfer) USB pipes but no similar bulk pipe API? There is
only the synchronous UsbBulkTransfer. All other USB stacks I've ever worked
with have provided this feature. The
lack of the async bulk API makes supporting quite a few devices harder than it
should be. It forces a thread to be stuck in the sync bulk reception for no
real need. It potentially causes bulk pipe to be read out of timer
notifications increasing latency.
So what is the recommended architecture for the UEFI drivers that need to
support devices where bulk pipes need to be polled for the duration of the
driver use? Are there any plans to introduce async bulk reads?
Many thanks for your insights,
Ilya Faenson
[email protected]
Rockville, MD USA
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