Re: Wrapping DPDK log messages with an application logger

[Stephen Hemminger <stephen@networkplumber.org>]

On Thu, 22 Jun 2023 19:08:25 +0300
Dmitry Kozlyuk <dmitry.kozliuk@gmail.com> wrote:

> Hi,
> 
> 2023-06-22 17:45 (UTC+0200), Lukáš Šišmiš:
> > I would think there could be opportunity to  pass my logging callback into
> > DPDK but I have not found it.  
> 
> FWIW, I too think a callback would be better than what DPDK offers now,
> because FILE* argument in rte_openlog_stream() is specific to C (libc).
> 
> > The only thing that I found was setting the stream (rte_openlog_stream()).  
> 
> Correct, this is what you're supposed to use.
> 
> > So I think I could use a Linux pipe to which DPDK would write to and the 
> > application would read the contents of it, parsing it into messages and 
> > logging it with the application logger.  
> 
> > Is there any alternative solution?  
> 
> https://man7.org/linux/man-pages/man3/fopencookie.3.html
> 
> It's effectively a way to pass the callback you want, just wrapped in a FILE*.


I have use fopencookie and rte_logstream to handle this in the past.
Probably the code is still there in Danos and other projects.