# Re: \[PATCH v2\] ip link: hsr: Add support for passing information about INTERLINK device

- From: David Ahern \<dsahern@kernel.org\>
- Date: 2024-03-15 02:45:32 
- List: netdev
- Page: https://ratatoskr.run/netdev/2024/03/11288957
- Thread: https://ratatoskr.run/netdev/2024/03/11288545/t.md

```text
On 3/8/24 7:57 AM, Lukasz Majewski wrote:
> diff --git a/ip/iplink_hsr.c b/ip/iplink_hsr.c
> index 76f24a6a..dc802ed9 100644
> --- a/ip/iplink_hsr.c
> +++ b/ip/iplink_hsr.c
> @@ -21,12 +21,15 @@ static void print_usage(FILE *f)
>  {
>  	fprintf(f,
>  		"Usage:\tip link add name NAME type hsr slave1 SLAVE1-IF slave2 SLAVE2-IF\n"
> -		"\t[ supervision ADDR-BYTE ] [version VERSION] [proto PROTOCOL]\n"
> +		"\t[ interlink INTERLINK-IF ] [ supervision ADDR-BYTE ] [ version VERSION ]\n"
> +		"\t[ proto PROTOCOL ]\n"
>  		"\n"
>  		"NAME\n"
>  		"	name of new hsr device (e.g. hsr0)\n"
>  		"SLAVE1-IF, SLAVE2-IF\n"
>  		"	the two slave devices bound to the HSR device\n"
> +		"INTERLINK-IF\n"
> +		"	the interlink device bound to the HSR network to connect SAN device\n"
>  		"ADDR-BYTE\n"
>  		"	0-255; the last byte of the multicast address used for HSR supervision\n"
>  		"	frames (default = 0)\n"
> @@ -82,6 +85,12 @@ static int hsr_parse_opt(struct link_util *lu, int argc, char **argv,
>  			if (ifindex == 0)
>  				invarg("No such interface", *argv);
>  			addattr_l(n, 1024, IFLA_HSR_SLAVE2, &ifindex, 4);
> +		} else if (strcmp(*argv, "interlink") == 0) {
> +			NEXT_ARG();
> +			ifindex = ll_name_to_index(*argv);
> +			if (ifindex == 0)
> +				invarg("No such interface", *argv);
> +			addattr_l(n, 1024, IFLA_HSR_INTERLINK, &ifindex, 4);
>  		} else if (matches(*argv, "help") == 0) {
>  			usage();
>  			return -1;
> @@ -109,6 +118,9 @@ static void hsr_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
>  	if (tb[IFLA_HSR_SLAVE2] &&
>  	    RTA_PAYLOAD(tb[IFLA_HSR_SLAVE2]) < sizeof(__u32))
>  		return;
> +	if (tb[IFLA_HSR_INTERLINK] &&
> +	    RTA_PAYLOAD(tb[IFLA_HSR_INTERLINK]) < sizeof(__u32))
> +		return;
>  	if (tb[IFLA_HSR_SEQ_NR] &&
>  	    RTA_PAYLOAD(tb[IFLA_HSR_SEQ_NR]) < sizeof(__u16))
>  		return;
> @@ -132,6 +144,10 @@ static void hsr_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
>  	else
>  		print_null(PRINT_ANY, "slave2", "slave2 %s ", "<none>");
>  
> +	if (tb[IFLA_HSR_INTERLINK])
> +		print_color_string(PRINT_ANY, COLOR_IFNAME, "interlink", "interlink %s ",
> +				   ll_index_to_name(rta_getattr_u32(tb[IFLA_HSR_INTERLINK])));
> +
>  	if (tb[IFLA_HSR_SEQ_NR])
>  		print_int(PRINT_ANY,
>  			  "seq_nr",


Please update the man page as well, man/man8/ip-link.8.in.

pw-bot: cr
```