netdev - Re: [RFC 3/4] nfp: make use of extended ack message reporting

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Date:   Tue, 25 Apr 2017 08:42:32 -0400
From:   Jamal Hadi Salim <jhs@...atatu.com>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>,
        netdev@...r.kernel.org
Cc:     davem@...emloft.net, johannes@...solutions.net,
        dsa@...ulusnetworks.com, daniel@...earbox.net,
        alexei.starovoitov@...il.com, bblanco@...il.com,
        john.fastabend@...il.com, kubakici@...pl, oss-drivers@...ronome.com
Subject: Re: [RFC 3/4] nfp: make use of extended ack message reporting

Good stuff. Question below:

On 17-04-25 04:06 AM, Jakub Kicinski wrote:
> Try to carry error messages to the user via the netlink extended

[..]
> +nfp_net_check_config(struct nfp_net *nn, struct nfp_net_dp *dp,
> +		     struct netlink_ext_ack *extack)
>  {
>  	/* XDP-enabled tests */
>  	if (!dp->xdp_prog)
>  		return 0;
>  	if (dp->fl_bufsz > PAGE_SIZE) {
> -		nn_warn(nn, "MTU too large w/ XDP enabled\n");
> +		NL_SET_ERR_MSG(extack, "MTU too large w/ XDP enabled");

So are we going to standardize these strings?
i.e what if some user has written a bash script that depends on this
string and it gets changed later.

cheers,
jamal