Re: [dpdk-dev] rte_eal_init() alternative?

[Thomas Monjalon <thomas.monjalon@6wind.com>]

2015-09-02 12:00, Stephen Hemminger:
> On Wed, 2 Sep 2015 18:17:40 +0000
> Don Provan <dprovan@bivio.net> wrote:
> 
> > Thomas Monjalon:
> > >Yes but please, do not create an alternative init function.
> > >We just need to replace panic/exit with error codes and be sure that apps and examples handle them correctly.
> > 
> > I understand your concerns, but the panics are really just the tip of the iceberg of the EAL library not realizing it's a library. It really makes no sense to think the library should define the application's command line, or that the PCI bus should be probed without considering whether this application is going to use PCI, and or to insist that EAL work be done on internal EAL threads.
> > 
> > So I'd say it's way past time to consider revamping initialization to start the process of ending the DPDK library's tail wagging the application's dog. Naturally this would have to be done while retaining the existing init routine on top of a real library initialization, but that's just an unfortunate artifact of the library's history, not a rational design decision for moving forward.
> > 
> > -don provan
> > 
> 
> You are welcome to submit patches with what you are proposing for review.
> Theoretical requirements discussions will probably only result in more mail,
> not new code. You know what you want, propose a solution.

+1
Everybody agree that DPDK should be more flexible.
We move from a bare metal framework to a real library.
They are shortcuts in original design which can be changed.

> As far as the command line. That is easily managed by realizing the application
> doesn't have to pass the original command line into EAL. If you just view the
> command line as a way to pass unstructured options; the application or infrastructure
> can build up new values and pass it in.
> 
> I agree that initialization itself should try and not fail except in the
> most extreme cases.  "ie I can't find /sys what is wrong" and should try
> and adapt more "you asked for 128 cpu's but I see only 2, log it and continue"
>