Re: [dpdk-dev] [PATCH] devargs: restore empty devargs as ""

[Tetsuya Mukawa <mukawa@igel.co.jp>]

On 2015/02/24 18:41, David Marchand wrote:
> Following commit c07691ae1089, an implicit change has been done in the devargs
> api.
> This triggers problem in virtual pmds that did not check for parameters validity
> as it was implicitely valid.
>
> Fix this by restoring the empty argument as "" and add a note in the api.
> Restore associated tests.
>
> Fixes: c07691ae1089 ("devargs: remove limit on parameters length")
> Reported-by: Tetsuya Mukawa <mukawa@igel.co.jp>
> Signed-off-by: David Marchand <david.marchand@6wind.com>
> ---
>  app/test/test_devargs.c                     |    2 +-
>  lib/librte_eal/common/eal_common_devargs.c  |   11 +++++++----
>  lib/librte_eal/common/include/rte_devargs.h |    2 +-
>  3 files changed, 9 insertions(+), 6 deletions(-)
>
> diff --git a/app/test/test_devargs.c b/app/test/test_devargs.c
> index 08fb781..f7fc59c 100644
> --- a/app/test/test_devargs.c
> +++ b/app/test/test_devargs.c
> @@ -107,7 +107,7 @@ test_devargs(void)
>  		devargs->pci.addr.devid != 0 ||
>  		devargs->pci.addr.function != 1)
>  		goto fail;
> -	if (devargs->args)
> +	if (!devargs->args || strcmp(devargs->args, "") != 0)
>  		goto fail;
>  	free_devargs_list();
>  
> diff --git a/lib/librte_eal/common/eal_common_devargs.c b/lib/librte_eal/common/eal_common_devargs.c
> index 3aace08..eadd719 100644
> --- a/lib/librte_eal/common/eal_common_devargs.c
> +++ b/lib/librte_eal/common/eal_common_devargs.c
> @@ -73,10 +73,13 @@ rte_eal_devargs_add(enum rte_devtype devtype, const char *devargs_str)
>  	if (sep != NULL) {
>  		sep[0] = '\0';
>  		devargs->args = strdup(sep + 1);
> -		if (devargs->args == NULL) {
> -			RTE_LOG(ERR, EAL, "cannot allocate for devargs args\n");
> -			goto fail;
> -		}
> +	} else {
> +		devargs->args = strdup("");
> +	}
> +
> +	if (devargs->args == NULL) {
> +		RTE_LOG(ERR, EAL, "cannot allocate for devargs args\n");
> +		goto fail;
>  	}
>  
>  	switch (devargs->type) {
> diff --git a/lib/librte_eal/common/include/rte_devargs.h b/lib/librte_eal/common/include/rte_devargs.h
> index 996e180..6834333 100644
> --- a/lib/librte_eal/common/include/rte_devargs.h
> +++ b/lib/librte_eal/common/include/rte_devargs.h
> @@ -88,7 +88,7 @@ struct rte_devargs {
>  			char drv_name[32];
>  		} virtual;
>  	};
> -	/** Arguments string as given by user. */
> +	/** Arguments string as given by user or "" for no argument. */
>  	char *args;
>  };
>  

Hi David,

I've confirmed this patch fixes the issue descried in above comment.

Thanks,
Tetsuya