Re: [dpdk-dev] [PATCH] eal/linuxapp: Add parameter to specify master lcore id

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

2014-11-03 13:02, Aaron Campbell:
> > On Jul 8, 2014, at 5:28 AM, Simon Kuenzer <simon.kuenzer@neclab.eu> wrote:
> > 
> > +			else if (!strcmp(lgopts[option_index].name, OPT_MASTER_LCORE)) {
> > +				if (!coremask_ok) {
> > +					RTE_LOG(ERR, EAL, "please specify the master "
> > +							"lcore id after specifying "
> > +							"the coremask\n");
> > +					eal_usage(prgname);
> > +					return -1;
> > +				}
> 
> 
> Hi Simon,
> 
> I think that forcing a particular command line order is not that clean.
> It might be better to remove the cfg->master_lcore setting from
> eal_parse_coremask(), and defer the selection of the master lcore until
> all of the command-line options have been parsed.  If —master-lcore was
> specified, save the value and use that, otherwise
> rte_get_next_lcore(-1, 0, 0) can return the first bit set in the coremask.

It's not sufficient: eal_parse_master_lcore() requires cfg->lcore_role
to be set. There is a real dependency between these 2 options.
I'm going to submit a v2. Feel free to improve it with another patch.

-- 
Thomas