netdev - Re: [PATCH iproute2-next 1/6] bridge: mdb: Use a boolean to indicate nest is required

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Date:   Fri, 16 Dec 2022 13:59:18 +0200
From:   Nikolay Aleksandrov <razor@...ckwall.org>
To:     Ido Schimmel <idosch@...dia.com>, netdev@...r.kernel.org
Cc:     dsahern@...il.com, stephen@...workplumber.org, mlxsw@...dia.com
Subject: Re: [PATCH iproute2-next 1/6] bridge: mdb: Use a boolean to indicate
 nest is required

On 15/12/2022 19:52, Ido Schimmel wrote:
> Currently, the only attribute inside the 'MDBA_SET_ENTRY_ATTRS' nest is
> 'MDBE_ATTR_SOURCE', but subsequent patches are going to add more
> attributes to the nest.
> 
> Prepare for the addition of these attributes by determining the
> necessity of the nest from a boolean variable that is set whenever one
> of these attributes is parsed. This avoids the need to have one long
> condition that checks for the presence of one of the individual
> attributes.
> 
> Signed-off-by: Ido Schimmel <idosch@...dia.com>
> ---
>  bridge/mdb.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/bridge/mdb.c b/bridge/mdb.c
> index d3afc900e798..4ae91f15dac8 100644
> --- a/bridge/mdb.c
> +++ b/bridge/mdb.c
> @@ -488,6 +488,7 @@ static int mdb_modify(int cmd, int flags, int argc, char **argv)
>  	};
>  	char *d = NULL, *p = NULL, *grp = NULL, *src = NULL;
>  	struct br_mdb_entry entry = {};
> +	bool set_attrs = false;
>  	short vid = 0;
>  
>  	while (argc > 0) {
> @@ -511,6 +512,7 @@ static int mdb_modify(int cmd, int flags, int argc, char **argv)
>  		} else if (strcmp(*argv, "src") == 0) {
>  			NEXT_ARG();
>  			src = *argv;
> +			set_attrs = true;
>  		} else {
>  			if (matches(*argv, "help") == 0)
>  				usage();
> @@ -538,7 +540,7 @@ static int mdb_modify(int cmd, int flags, int argc, char **argv)
>  
>  	entry.vid = vid;
>  	addattr_l(&req.n, sizeof(req), MDBA_SET_ENTRY, &entry, sizeof(entry));
> -	if (src) {
> +	if (set_attrs) {
>  		struct rtattr *nest = addattr_nest(&req.n, sizeof(req),
>  						   MDBA_SET_ENTRY_ATTRS);
>  		struct in6_addr src_ip6;

Reviewed-by: Nikolay Aleksandrov <razor@...ckwall.org>