[LAU] AVB on Linux

[Brandon Hale]

Hello Fernando,

Thank you for this information. Maybe my institution will be able to get 
one of these interfaces to try out avb support. Maybe I can convince 
them to get one, since it will also work on macos.

Brandon Hale

On 7/13/21 12:41 PM, Fernando Lopez-Lezcano wrote:
> On 7/13/21 8:20 AM, Brandon Hale wrote:
>> Thanks so much for these links Fernando. I've played with the 
>> OpenAvnu repo about 2 years ago, but I couldn't get it working as I 
>> didn't know what I was doing. I'll try compiling it with the standard 
>> Linux network stack and see how far I get.
>>
>> I don't currently have a motu avb interface, but I do have access to 
>> an RME Digiface AVB <https://www.rme-usa.com/digiface-avb.html>. I'll 
>> look through those repositories, but I figure there's not much I can 
>> do with that interface on Linux as of yet. :(
>>
>> What interface do you use to get the 64 channels over usb?
>
> There are several, at home I currently have an 8M and a 16A and I am 
> driving them through a patched kernel with the drumfix's driver 
> (caveat: the driver does NOT work with an RT patched kernel - 
> something to do with the number of interrupts generated and context 
> switches - but it works fine with a full preemption kernel with 
> threadirqs disabled), details in this thread:
>
> https://linuxmusicians.com/viewtopic.php?f=6&t=18046&sid=5021bc427a7f0abd6b7a24c8aaef15d7&start=630 
>
>
> For a couple of our speaker arrays I have again used 16A and 8M mainly 
> as gateways into a larger array of Motus[*], but the 24ai and 24ao 
> also work. For these I am still running old firmware and the regular 
> usb driver in linux (newer Motu interfaces cannot be downgraded to old 
> enough firmware for the class compliant driver to work).
>
> -- Fernando
>
> [*] https://ccrma.stanford.edu/~nando/publications/stage_grail_2019.pdf
>
>
>> On 7/13/21 2:17 AM, Fernando Lopez-Lezcano wrote:
>>> On 7/12/21 3:47 PM, Brandon Hale wrote:
>>>> Hello all,
>>>>
>>>> Are there any of you here who are using AVB on Linux, especially 
>>>> with a standard Ethernet port? What software or hardware are you 
>>>> using to do this on your Linux machines? I am interested in playing 
>>>> with it and have some AVB speakers to mess with, but I'm not sure 
>>>> if it is even possible yet, especially with a standard laptop 
>>>> Ethernet port.
>>>>
>>>> Tell me about your Linux AVB success stories!
>>>
>>> None yet... :-(
>>>
>>> Regarding the use of i210 network interfaces, a while back I found 
>>> this:
>>> https://github.com/AVnu/OpenAvnu/issues/601
>>>
>>> ----
>>> At the top-level of the OpenAvnu checkout, run this make command:
>>>
>>> $ PLATFORM_TOOLCHAIN=generic make avtp_pipeline
>>>
>>> That will prevent it from linking to the i210 library and instead 
>>> use the standard Linux network stack. The packet launch times and 
>>> presentation timestamps will be
>>>  far less even and I'm working on ways to lessen those problems, but 
>>> you should be able to get a talker and listener built from the 
>>> avtp_pipeline code to work toge
>>> ther with some tweaking of the avtp_pipeline INI files. Be sure to 
>>> read through the documentation that comes with the avtp_pipeline code.
>>> ----
>>>
>>> But never had a chance to test it and see if it really works...
>>>
>>> Then there is this software:
>>> https://github.com/Drumfix/avb4linux.git
>>>
>>> This is just 8 ports i/o on linux for motu avb cards, but it needs 
>>> an i210 NIC (by the same guy that posted an experimental driver for 
>>> proprietary usb mode on Motu's - in the LinuxMusicians forum - so 
>>> you can get 64 channel i/o over usb with the newest firmware - I am 
>>> using it and it works quite nicely).
>>>
>>> -- Fernando
>