Re: [PATCH v2] eal: read and parse device option separately

[Thomas Monjalon <thomas@monjalon.net>]

Hi Gaetan

02/08/2017 10:56, Gaetan Rivet:
> When the EAL parses the common options given to the application,
> not all subsystems are available. Some device drivers are registered
> afterward upon dynamic plugin loading.
> 
> Devices using those drivers are thus unable to be parsed by any drivers
> and are rejected.
> 
> Store the device options first and keep them for later processing.
> Parse these right before initializing the buses, the drivers must have
> been stabilized at this point.
> 
> Signed-off-by: Gaetan Rivet <gaetan.rivet@6wind.com>
> ---
> 
> v2:
> 
>   - Fix the -w / -b incompatibility check.
>     It was checking that no two incompatible rte_devargs were inserted.
>     As rte_devargs are now generated right before buses scan, this check
>     was always correct, even when it should have failed.

You are doing this check in eal_check_common_options().
I think you can do the check earlier in eal_parse_common_option()
with 2 static variables, instead of implementing the
new function eal_option_device_type_count().

> +static unsigned int
> +eal_option_device_type_count(enum rte_devtype type)
[...]
> @@ -944,14 +1013,14 @@ eal_parse_common_option(int opt, const char *optarg,
>  	switch (opt) {
>  	/* blacklist */
>  	case 'b':
> -		if (rte_eal_devargs_add(RTE_DEVTYPE_BLACKLISTED_PCI,
> +		if (eal_option_device_add(RTE_DEVTYPE_BLACKLISTED_PCI,
>  				optarg) < 0) {
>  			return -1;
>  		}
>  		break;
>  	/* whitelist */
>  	case 'w':
> -		if (rte_eal_devargs_add(RTE_DEVTYPE_WHITELISTED_PCI,
> +		if (eal_option_device_add(RTE_DEVTYPE_WHITELISTED_PCI,
>  				optarg) < 0) {
>  			return -1;
>  		}
> @@ -1061,7 +1130,7 @@ eal_parse_common_option(int opt, const char *optarg,
>  		break;
>  
>  	case OPT_VDEV_NUM:
> -		if (rte_eal_devargs_add(RTE_DEVTYPE_VIRTUAL,
> +		if (eal_option_device_add(RTE_DEVTYPE_VIRTUAL,
>  				optarg) < 0) {
>  			return -1;
>  		}
> @@ -1187,8 +1256,8 @@ eal_check_common_options(struct internal_config *internal_cfg)
>  		return -1;
>  	}
>  
> -	if (rte_eal_devargs_type_count(RTE_DEVTYPE_WHITELISTED_PCI) != 0 &&
> -		rte_eal_devargs_type_count(RTE_DEVTYPE_BLACKLISTED_PCI) != 0) {
> +	if (eal_option_device_type_count(RTE_DEVTYPE_WHITELISTED_PCI) != 0 &&
> +		eal_option_device_type_count(RTE_DEVTYPE_BLACKLISTED_PCI) != 0) {
>  		RTE_LOG(ERR, EAL, "Options blacklist (-b) and whitelist (-w) "
>  			"cannot be used at the same time\n");
>  		return -1;

[...]
> +static int
> +eal_option_device_add(enum rte_devtype type, const char *optarg)
> +{
> +	struct device_option *deo;
> +	size_t optlen;

Just a last comment about variable name:
Instead of deo, opt or option would be more meaningful.

Thanks for the important fix!