Date: Fri, 20 Mar 2015 17:04:14 +0000 From: Gokul Krishna <gokulkrishna334@gmail.com> To: Hans Petter Selasky <hps@selasky.org> Cc: freebsd-hackers@freebsd.org, freebsd-usb@freebsd.org Subject: Re: GSoC 2015: USB-Front end driver Message-ID: <CA%2B21aci8dxKy74zaRzFdYX1BYUeBLLp8KMi-cpd_7-%2B0sTOkoQ@mail.gmail.com> In-Reply-To: <5509526C.8050000@selasky.org> References: <CA%2B21acgbXduDse2D0UE6Diqn3E8AX5_3w8JFWZ53_dPjUOFm4w@mail.gmail.com> <54FB120C.7080707@selasky.org> <54FB132E.9070901@selasky.org> <550683AF.1010007@selasky.org> <CA%2B21aciNMZ-vqf5470ybA5=R=bL7ukG51OwKOLhAKJ_8eVvYjQ@mail.gmail.com> <550708B0.8010601@selasky.org> <550934CE.9030607@selasky.org> <CA%2B21aciyRO0yokjA-NzrfhbAeBcHrm70_vwyHkVcadGCQrZHGw@mail.gmail.com> <5509526C.8050000@selasky.org>
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Hi I found these links usefull to understand some major API constructs for freebsd http://www.selasky.org/hans_petter/usb4bsd/index_Obj8_00.html with the vusb_analyser and enabling the usb_debug locks in usb_debug.c from this link of freebsd usb source tree http://svnweb.freebsd.org/base/head/sys/dev/usb/ and by testing with keyboard which is low speed interrupt transfer endpoint will i be able to see frames data transfer and debug lock messages , so i cud understand the source code functions related to USB stack (major API functions which i watched in your FreeBSD USB stack and in link i mentioned above) which i need to implement in Xen frontend code. Kindly i want to discuss these in skype . Could you please mention your convenient availability time. thanks and regards gokul On Wed, Mar 18, 2015 at 10:24 AM, Hans Petter Selasky <hps@selasky.org> wrote: > Hi, > > On 03/18/15 11:19, Gokul Krishna wrote: > >> Hi >> Sure I will do that. >> I watched the video on USB stack on freeBSD and I could able understand >> those USB data transfer management constructs and other things explained . >> I also checked the vusb-analyser which is a Virtual USB Bus-analyser and >> understood certain debugging things that it gives information of data >> including device address from device descriptor and amount of data >> transfer >> from interface and endpoint (In and Out buffers) descriptors data >> structures . >> > > Another idea might be to implement a USB backend for Wireshark. It also > can understand USB transactions! > > >> The aim of the project is to convert XEN USB device model( made with Linux >> requirement ) into something compatible with FreeBSD USB Stack. >> > > Right! > > >> I also try to see things on para-virtualised XEN USB . I found the >> appropriate front-end driver source tree in slide number 7 in the below >> pdf >> link. >> http://www-archive.xenproject.org/files/xensummit_oracle09/PVUSB.pdf >> (please give your suggestions and comments and will i have access to see >> this code) >> I think i need to go through this particular source code to find my >> precise >> task >> >> So I will have more clarity in planning the list of milestone tasks for >> mid-term deliverables toll gate and final deliverables toll gates which i >> need to get reviewed from you before applying the proposal. >> > > When you have something ready, just contact me off-list and I'll give it a > review. > > --HPS > >
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