Re: [ndctl PATCH v2 11/18] cxl/region: Make ways an integer argument

[Alison Schofield <alison.schofield@intel.com>]

On Thu, Dec 08, 2022 at 01:29:03PM -0800, Dan Williams wrote:
> Since --ways does not take a unit value like --size, just make it an
> integer argument directly and skip the hand coded conversion.

Reviewed-by: Alison Schofield <alison.schofield@intel.com>
> 
> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
> ---
>  cxl/region.c |   41 +++++++++++++++++++----------------------
>  1 file changed, 19 insertions(+), 22 deletions(-)
> 
> diff --git a/cxl/region.c b/cxl/region.c
> index 334fcc291de7..494da5139c05 100644
> --- a/cxl/region.c
> +++ b/cxl/region.c
> @@ -21,21 +21,23 @@
>  static struct region_params {
>  	const char *bus;
>  	const char *size;
> -	const char *ways;
>  	const char *granularity;
>  	const char *type;
>  	const char *root_decoder;
>  	const char *region;
> +	int ways;
>  	bool memdevs;
>  	bool force;
>  	bool human;
>  	bool debug;
> -} param;
> +} param = {
> +	.ways = INT_MAX,
> +};
>  
>  struct parsed_params {
>  	u64 size;
>  	u64 ep_min_size;
> -	unsigned int ways;
> +	int ways;
>  	unsigned int granularity;
>  	const char **targets;
>  	int num_targets;
> @@ -63,9 +65,8 @@ OPT_BOOLEAN(0, "debug", &param.debug, "turn on debug")
>  OPT_STRING('s', "size", &param.size, \
>  	   "size in bytes or with a K/M/G etc. suffix", \
>  	   "total size desired for the resulting region."), \
> -OPT_STRING('w', "ways", &param.ways, \
> -	   "number of interleave ways", \
> -	   "number of memdevs participating in the regions interleave set"), \
> +OPT_INTEGER('w', "ways", &param.ways, \
> +	    "number of memdevs participating in the regions interleave set"), \
>  OPT_STRING('g', "granularity", \
>  	   &param.granularity, "interleave granularity", \
>  	   "granularity of the interleave set"), \
> @@ -126,15 +127,11 @@ static int parse_create_options(int argc, const char **argv,
>  		}
>  	}
>  
> -	if (param.ways) {
> -		unsigned long ways = strtoul(param.ways, NULL, 0);
> -
> -		if (ways == ULONG_MAX || (int)ways <= 0) {
> -			log_err(&rl, "Invalid interleave ways: %s\n",
> -				param.ways);
> -			return -EINVAL;
> -		}
> -		p->ways = ways;
> +	if (param.ways <= 0) {
> +		log_err(&rl, "Invalid interleave ways: %d\n", param.ways);
> +		return -EINVAL;
> +	} else if (param.ways < INT_MAX) {
> +		p->ways = param.ways;
>  	} else if (argc) {
>  		p->ways = argc;
>  	} else {
> @@ -155,13 +152,13 @@ static int parse_create_options(int argc, const char **argv,
>  	}
>  
>  
> -	if (argc > (int)p->ways) {
> +	if (argc > p->ways) {
>  		for (i = p->ways; i < argc; i++)
>  			log_err(&rl, "extra argument: %s\n", p->targets[i]);
>  		return -EINVAL;
>  	}
>  
> -	if (argc < (int)p->ways) {
> +	if (argc < p->ways) {
>  		log_err(&rl,
>  			"too few target arguments (%d) for interleave ways (%u)\n",
>  			argc, p->ways);
> @@ -253,7 +250,7 @@ static bool validate_memdev(struct cxl_memdev *memdev, const char *target,
>  
>  static int validate_config_memdevs(struct cxl_ctx *ctx, struct parsed_params *p)
>  {
> -	unsigned int i, matched = 0;
> +	int i, matched = 0;
>  
>  	for (i = 0; i < p->ways; i++) {
>  		struct cxl_memdev *memdev;
> @@ -393,7 +390,8 @@ static int cxl_region_determine_granularity(struct cxl_region *region,
>  					    struct parsed_params *p)
>  {
>  	const char *devname = cxl_region_get_devname(region);
> -	unsigned int granularity, ways;
> +	unsigned int granularity;
> +	int ways;
>  
>  	/* Default granularity will be the root decoder's granularity */
>  	granularity = cxl_decoder_get_interleave_granularity(p->root_decoder);
> @@ -408,7 +406,7 @@ static int cxl_region_determine_granularity(struct cxl_region *region,
>  		return granularity;
>  
>  	ways = cxl_decoder_get_interleave_ways(p->root_decoder);
> -	if (ways == 0 || ways == UINT_MAX) {
> +	if (ways == 0 || ways == -1) {
>  		log_err(&rl, "%s: unable to determine root decoder ways\n",
>  			devname);
>  		return -ENXIO;
> @@ -436,12 +434,11 @@ static int create_region(struct cxl_ctx *ctx, int *count,
>  {
>  	unsigned long flags = UTIL_JSON_TARGETS;
>  	struct json_object *jregion;
> -	unsigned int i, granularity;
>  	struct cxl_region *region;
> +	int i, rc, granularity;
>  	u64 size, max_extent;
>  	const char *devname;
>  	uuid_t uuid;
> -	int rc;
>  
>  	rc = create_region_validate_config(ctx, p);
>  	if (rc)
>