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

[Aaron Campbell <aaron@arbor.net>]

> On Nov 4, 2014, at 3:00 PM, Thomas Monjalon <thomas.monjalon@6wind.com> wrote:
> 
> 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.

I was nit-picking; although it might be nice if the new option is given, to verify the specified lcore is in the coremask.  I will ack v2 though and this can be improved some other time.

-Aaron