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 22:14:57 +0000
From: Donald Hunter <donald.hunter@...il.com>
To: Jakub Kicinski <kuba@...nel.org>
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 at 18:32, Jakub Kicinski <kuba@...nel.org> wrote:
>
> Somewhat incredibly the C seems to work, I tested with this sample:

Wow, above and beyond for writing a sample. Was it ever in any doubt
that it would work ;-)

> // 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;
> }