netdev - Re: [PATCH] ip link: hsr: Add support for passing information about INTERLINK device

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Message-ID: <20240226124110.37892211@hermes.local>
Date: Mon, 26 Feb 2024 12:41:10 -0800
From: Stephen Hemminger <stephen@...workplumber.org>
To: Lukasz Majewski <lukma@...x.de>
Cc: Andrew Lunn <andrew@...n.ch>, Vladimir Oltean <olteanv@...il.com>, Eric
 Dumazet <edumazet@...gle.com>, Florian Fainelli <f.fainelli@...il.com>,
 "David S. Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>,
 netdev@...r.kernel.org
Subject: Re: [PATCH] ip link: hsr: Add support for passing information about
 INTERLINK device

On Fri, 16 Feb 2024 14:21:14 +0100
Lukasz Majewski <lukma@...x.de> wrote:

> The HSR capable device can operate in two modes of operations -
> Doubly Attached Node for HSR (DANH) and RedBOX.
> 
> The latter one allows connection of non-HSR aware device to HSR network.
> This node is called SAN (Singly Attached Network) and is connected via
> INTERLINK network device.
> 
> This patch adds support for passing information about the INTERLINK device,
> so the Linux driver can properly setup it.
> 
> Signed-off-by: Lukasz Majewski <lukma@...x.de>

Patch should target iproute2-next since headers come from upstream.
And kernel side needs to be accepted first.

When it is merged to net-next, Dave Ahern can pickup the headers
from there.

>  
> diff --git a/ip/iplink_hsr.c b/ip/iplink_hsr.c
> index da2d03d..1f048fd 100644
> --- a/ip/iplink_hsr.c
> +++ b/ip/iplink_hsr.c
> @@ -25,12 +25,15 @@ 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"
> @@ -86,6 +89,12 @@ 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 (matches(*argv, "interlink") == 0) {

No new uses of matches() allowed in iproute2.

> +			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;
> @@ -113,6 +122,9 @@ 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;
> @@ -136,6 +148,14 @@ 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_string(PRINT_ANY,
> +			     "interlink",
> +			     "interlink %s ",
> +			     ll_index_to_name(rta_getattr_u32(tb[IFLA_HSR_INTERLINK])));

Better to print that in color and pack args on line up to 100 characters.

	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])));

> +	else
> +		print_null(PRINT_ANY, "interlink", "interlink %s ", "<none>");

The output from ip show commands should resemble inputs to configuration.
Therefore the else clause should not be there. Only print if interlink is configured.