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

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Message-ID: <20240223105503.2c0afc88@wsk>
Date: Fri, 23 Feb 2024 10:55:03 +0100
From: Lukasz Majewski <lukma@...x.de>
To: Andrew Lunn <andrew@...n.ch>, Vladimir Oltean <olteanv@...il.com>,
 Stephen Hemminger <stephen@...workplumber.org>
Cc: 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

Dear Community,

> 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>
> ---
>  include/uapi/linux/if_link.h |  1 +
>  ip/iplink_hsr.c              | 22 +++++++++++++++++++++-
>  2 files changed, 22 insertions(+), 1 deletion(-)
> 
> diff --git a/include/uapi/linux/if_link.h
> b/include/uapi/linux/if_link.h index 41708e2..aa70ed6 100644
> --- a/include/uapi/linux/if_link.h
> +++ b/include/uapi/linux/if_link.h
> @@ -1122,6 +1122,7 @@ enum {
>  	IFLA_HSR_PROTOCOL,		/* Indicate different
> protocol than
>  					 * HSR. For example PRP.
>  					 */
> +	IFLA_HSR_INTERLINK,		/* HSR interlink network
> device */ __IFLA_HSR_MAX,
>  };
>  
> 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) {
> +			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])));
> +	else
> +		print_null(PRINT_ANY, "interlink", "interlink %s ",
> "<none>"); +
>  	if (tb[IFLA_HSR_SEQ_NR])
>  		print_int(PRINT_ANY,
>  			  "seq_nr",

Any feedback if this approach is acceptable?


Best regards,

Lukasz Majewski

--

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