[PATCH v4] net/af_xdp: re-enable secondary process support

[Ferruh Yigit]

On 2/10/2022 3:40 PM, Loftus, Ciara wrote:
>> Subject: Re: [PATCH v4] net/af_xdp: re-enable secondary process support
>>
>> On 2/9/2022 9:48 AM, Ciara Loftus wrote:
>>> Secondary process support had been disabled for the AF_XDP PMD
>> because
>>> there was no logic in place to share the AF_XDP socket file descriptors
>>> between the processes. This commit introduces this logic using the IPC
>>> APIs.
>>>
>>> Rx and Tx are disabled in the secondary process due to memory mapping of
>>> the AF_XDP rings being assigned by the kernel in the primary process only.
>>> However other operations including retrieval of stats are permitted.
>>>
>>> Signed-off-by: Ciara Loftus <ciara.loftus at intel.com>
>>>
>>
>> Hi Ciara,
>>
>> When I tried to test the patch getting following error [1], it doesn't look
>> related to this patch but can you help to fix the issue, thanks.
>>
>> [1]
>> libxdp: Couldn't find a BPF file with name xsk_def_xdp_prog.o
>> xsk_configure(): Failed to create xsk socket.
>> eth_rx_queue_setup(): Failed to configure xdp socket
>> Fail to configure port 2 rx queues
>> EAL: Error - exiting with code: 1
> 
> 
> Hi Ferruh,
> 
> This file should be generated when libxdp is compiled.
> Mine is located @ /usr/local/lib/bpf/xsk_def_xdp_prog.o
> Can you check if that file is there for you? It could be in /usr/local/lib64/bpf/ on your machine.
> What kernel are you running on?
> 

It is in: /usr/local/lib64/bpf/xsk_def_xdp_prog.o

I had to compile libxdp from source because OS package version was old
to work with af_xdp.
Is something required to point location of this file to af_xdp PMD?

I run kernel:
5.15.16-200.fc35.x86_64