netdev - Re: [PATCH net-next v2 0/5] tools/net/ynl: Add support for nlctrl netlink family

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Date: Wed, 6 Mar 2024 10:32:19 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: Donald Hunter <donald.hunter@...il.com>
Cc: netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>, Eric
 Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, Jacob
 Keller <jacob.e.keller@...el.com>, Jiri Pirko <jiri@...nulli.us>, Stanislav
 Fomichev <sdf@...gle.com>, donald.hunter@...hat.com
Subject: Re: [PATCH net-next v2 0/5] tools/net/ynl: Add support for nlctrl
 netlink family

On Wed,  6 Mar 2024 12:56:59 +0000 Donald Hunter wrote:
> This series adds a new YNL spec for the nlctrl family, plus some fixes
> and enhancements for ynl.
> 
> Patch 1 fixes an extack decoding bug
> Patch 2 gives cleaner netlink error reporting
> Patch 3 fixes an array-nest codegen bug
> Patch 4 adds nest-type-value support to ynl
> Patch 5 contains the nlctrl spec

Somewhat incredibly the C seems to work, I tested with this sample:

// SPDX-License-Identifier: GPL-2.0
#include <stdio.h>
#include <string.h>

#include <ynl.h>

#include "nlctrl-user.h"

int main(int argc, char **argv)
{
	struct nlctrl_getfamily_list *fams;
	struct ynl_error yerr;
	struct ynl_sock *ys;
	char *name;

	ys = ynl_sock_create(&ynl_nlctrl_family, &yerr);
	if (!ys) {
		fprintf(stderr, "YNL: %s\n", yerr.msg);
		return 1;
	}

	printf("Select family ($name; or 0 = dump): ");
	scanf("%ms", &name);

	if (!name || !strcmp(name, "0")) {
		fams = nlctrl_getfamily_dump(ys);
		if (!fams)
			goto err_close;

		ynl_dump_foreach(fams, f)
			printf("%d: %s\n", f->family_id, f->family_name);
		nlctrl_getfamily_list_free(fams);
	} else {
		struct nlctrl_getfamily_req *req;
		struct nlctrl_getfamily_rsp *f;

		req = nlctrl_getfamily_req_alloc();
		nlctrl_getfamily_req_set_family_name(req, name);

		f = nlctrl_getfamily(ys, req);
		nlctrl_getfamily_req_free(req);
		if (!f)
			goto err_close;

		printf("%d: %s\n", f->family_id, f->family_name);
		nlctrl_getfamily_rsp_free(f);
	}
	free(name);

	ynl_sock_destroy(ys);
	return 0;

err_close:
	fprintf(stderr, "YNL: %s\n", ys->err.msg);
	ynl_sock_destroy(ys);
	return 2;
}