Re: [dpdk-dev] [PATCH v2] app/testpmd: report invalid command line parameter

[Ferruh Yigit <ferruh.yigit@intel.com>]

On 11/18/2019 3:37 PM, David Marchand wrote:
> We currently do not check that a non option string has been passed to
> testpmd.
> 
> Example:
> $ ./master/app/testpmd --no-huge -m 512 --vdev net_null0 \
> 	--vdev net_null1 -- -i nb-cores=2 --total-num-mbuf 2048
> [...]
> testpmd> show config fwd
> io packet forwarding - ports=2 - cores=1 - streams=2 - NUMA support
> enabled, MP allocation mode: native
> Logical Core 1 (socket 0) forwards packets on 2 streams:
>   RX P=0/Q=0 (socket 0) -> TX P=1/Q=0 (socket 0) peer=02:00:00:00:00:01
>   RX P=1/Q=0 (socket 0) -> TX P=0/Q=0 (socket 0) peer=02:00:00:00:00:00
> 
> Here nb-cores=2 is just ignored, while the (probably sleepy) user did not
> notice this.
> 
> Validate that all strings passed to testpmd are part of a known option.
> 
> After this patch:
> $ ./master/app/testpmd --no-huge -m 512 --vdev net_null0 \
> 	--vdev net_null1 -- -i nb-cores=2 --total-num-mbuf 2048
> [...]
> Invalid parameter: nb-cores=2
> EAL: Error - exiting with code: 1
>   Cause: Command line incorrect
> 
> While at it, when passing an unknown option, print the string that gets
> refused by getopt_long to help the user.
> 
> Fixes: af75078fece3 ("first public release")
> Cc: stable@dpdk.org
> 
> Signed-off-by: David Marchand <david.marchand@redhat.com>
> Reviewed-by: Ferruh Yigit <ferruh.yigit@intel.com>
> ---
> This seems a bit dangerous to take this kind of change this late.
> Some "working fine" scripts might now report failures from testpmd because
> of garbage in the command line.
> 
> Sending the patch anyway to see what others think about it.
> 
> Changelog since v1:
> - fixed example in commitlog,
> 
> ---
>  app/test-pmd/parameters.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/app/test-pmd/parameters.c b/app/test-pmd/parameters.c
> index deca7a6828..2e7a504415 100644
> --- a/app/test-pmd/parameters.c
> +++ b/app/test-pmd/parameters.c
> @@ -1363,12 +1363,19 @@ launch_args_parse(int argc, char** argv)
>  			break;
>  		default:
>  			usage(argv[0]);
> +			printf("Invalid option: %s\n", argv[optind]);
>  			rte_exit(EXIT_FAILURE,
>  				 "Command line is incomplete or incorrect\n");
>  			break;
>  		}
>  	}
>  
> +	if (optind != argc) {

I hope 'optind' works as expected [1] in Windows too (Anatoly verified the
FreeBSD one).

@Pallavi, @Ranjit, Can you please confirm it?

[1]
https://linux.die.net/man/3/optind
"
If there are no more option characters, getopt() returns -1. Then optind is the
index in argv of the first argv-element that is not an option.
"