netdev - Re: [PATCHv2 net-next] sched: multicast sched extack messages

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Date:   Wed, 21 Dec 2022 17:28:17 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Hangbin Liu <liuhangbin@...il.com>
Cc:     netdev@...r.kernel.org, Jamal Hadi Salim <jhs@...atatu.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Jiri Pirko <jiri@...nulli.us>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        David Ahern <dsahern@...nel.org>,
        Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
Subject: Re: [PATCHv2 net-next] sched: multicast sched extack messages

On Wed, 21 Dec 2022 17:39:40 +0800 Hangbin Liu wrote:
> +	nlh = nlmsg_put(skb, portid, n->nlmsg_seq, NLMSG_ERROR, sizeof(*errmsg),
> +			NLM_F_ACK_TLVS | NLM_F_CAPPED);
> +	if (!nlh)
> +		return -1;
> +
> +	errmsg = (struct nlmsgerr *)nlmsg_data(nlh);
> +	errmsg->error = 0;
> +	errmsg->msg = *n;
> +
> +	if (nla_put_string(skb, NLMSGERR_ATTR_MSG, extack->_msg))
> +		return -1;
> +
> +	nlmsg_end(skb, nlh);

I vote "no", notifications should not generate NLMSG_ERRORs.
(BTW setting pid and seq on notifications is odd, no?)