XhcCheckUrbResult() will get invoked many times for single request.
XhcExecTransfer () will be only invoked once for single request. The URB is a
software data structure and will be persistent till the request is finished. It
will record how many bytes has been transferred.
You can think the logic as it's continuously polling to see if there is new
data received.
Thanks
Feng
From: Anbazhagan, Baraneedharan [mailto:anbazha...@hp.com]
Sent: Friday, April 17, 2015 11:00
To: edk2-devel@lists.sourceforge.net
Subject: Re: [edk2] XHCI data transfer size
But the total data transfer size is accumulated based on input DataLen field
and if there is more than 1 transfer block(64K+ data request), then the return
size is not correct.
CheckedUrb->Completed += (CheckedUrb->DataLen - EvtTrb->Lenth);
From: Tian, Feng [mailto:feng.t...@intel.com]
Sent: Thursday, April 16, 2015 9:34 PM
To: Anbazhagan, Baraneedharan;
edk2-devel@lists.sourceforge.net<mailto:edk2-devel@lists.sourceforge.net>
Subject: Re: [edk2] XHCI data transfer size
Hi, Baranee
The intention of XhcCheckUrbResult() and XhcExecTransfer() is to traverse all
received events and accumulate these received data lengths for a URB request to
see if it matches with requested data length.
The members of URB, such as ->Completed, -> Finished, -> StartDone and ->
EndDone, are used for this way.
Thanks
Feng
From: Anbazhagan, Baraneedharan [mailto:anbazha...@hp.com]
Sent: Thursday, April 16, 2015 08:31
To: edk2-devel@lists.sourceforge.net<mailto:edk2-devel@lists.sourceforge.net>
Cc: Tian, Feng
Subject: XHCI data transfer size
XhcCheckUrbResult calculates the data transfer size to return based on DataLen
within Urb, If the request is more than 64K and then it reports the size as
multiples of TrbNumber.
Does it make sense to make use of Length field within TRB to calculate total
data transfer size?
-Baranee
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