netdev - Re: [patch iproute2-next v2 3/5] devlink: introduce support for netns id for nested handle

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Date: Tue, 19 Sep 2023 08:03:27 -0600
From: David Ahern <dsahern@...il.com>
To: Jiri Pirko <jiri@...nulli.us>, netdev@...r.kernel.org
Cc: stephen@...workplumber.org, daniel.machon@...rochip.com
Subject: Re: [patch iproute2-next v2 3/5] devlink: introduce support for netns
 id for nested handle

On 9/19/23 5:56 AM, Jiri Pirko wrote:
> @@ -2723,6 +2725,40 @@ static bool should_arr_last_handle_end(struct dl *dl, const char *bus_name,
>  	       !cmp_arr_last_handle(dl, bus_name, dev_name);
>  }
>  
> +struct netns_name_by_id_ctx {
> +	int32_t id;
> +	char *name;
> +	struct rtnl_handle *rth;
> +};
> +
> +static int netns_name_by_id_func(char *nsname, void *arg)
> +{
> +	struct netns_name_by_id_ctx *ctx = arg;
> +	int32_t ret;
> +
> +	ret = netns_netnsid_from_name(ctx->rth, nsname);
> +	if (ret < 0 || ret != ctx->id)
> +		return 0;
> +	ctx->name = strdup(nsname);
> +	return 1;
> +}
> +
> +static char *netns_name_by_id(int32_t id)
> +{
> +	struct rtnl_handle rth;
> +	struct netns_name_by_id_ctx ctx = {
> +		.id = id,
> +		.rth = &rth,
> +	};
> +
> +	if (rtnl_open(&rth, 0) < 0)
> +		return NULL;
> +	netns_foreach(netns_name_by_id_func, &ctx);
> +	rtnl_close(&rth);
> +
> +	return ctx.name;
> +}
> +

The above is not devlink specific, so it should go in lib/namespace.c as
well.

Name wise it should be consistent with the last patch, so either
netns_id_to_name or netns_name_from_id based on the name from the
refactoring in patch 2.


>  static void pr_out_nested_handle(struct nlattr *nla_nested_dl)
>  {
>  	struct nlattr *tb[DEVLINK_ATTR_MAX + 1] = {};
> @@ -2740,6 +2776,30 @@ static void pr_out_nested_handle(struct nlattr *nla_nested_dl)
>  	sprintf(buf, "%s/%s", mnl_attr_get_str(tb[DEVLINK_ATTR_BUS_NAME]),
>  		mnl_attr_get_str(tb[DEVLINK_ATTR_DEV_NAME]));
>  	print_string(PRINT_ANY, "nested_devlink", " nested_devlink %s", buf);
> +
> +	if (tb[DEVLINK_ATTR_NETNS_ID]) {
> +		int32_t id = mnl_attr_get_u32(tb[DEVLINK_ATTR_NETNS_ID]);
> +
> +		if (id >= 0) {
> +			char *name = netns_name_by_id(id);
> +
> +			if (name) {
> +				print_string(PRINT_ANY,
> +					     "nested_devlink_netns",
> +					     " nested_devlink_netns %s", name);
> +				free(name);
> +			} else {
> +				print_int(PRINT_ANY,
> +					  "nested_devlink_netnsid",
> +					  " nested_devlink_netnsid %d", id);
> +			}
> +		} else {
> +			print_string(PRINT_FP, NULL,
> +				     " nested_devlink_netnsid %s", "unknown");
> +			print_int(PRINT_JSON,
> +				  "nested_devlink_netnsid", NULL, id);
> +		}

Also, devlink in the name here provides no addititional value (devlink
is the command name) and why add 'nested'? The attribute is just
NETNS_ID, so why not just 'netnsid' here.


> +	}
>  }
>  
>  static void __pr_out_handle_start(struct dl *dl, struct nlattr **tb,