linux-kernel - Re: [PATCH net-next 2/2] vxlan: add back error messages to vxlan_config

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Date:   Wed, 28 Jun 2017 19:25:26 +0200
From:   Jiri Benc <jbenc@...hat.com>
To:     Matthias Schiffer <mschiffer@...verse-factory.net>
Cc:     davem@...emloft.net, roopa@...ulusnetworks.com, pshelar@....org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 2/2] vxlan: add back error messages to
 vxlan_config_validate() as extended netlink acks

On Tue, 27 Jun 2017 22:47:58 +0200, Matthias Schiffer wrote:
>  		if ((conf->flags & ~VXLAN_F_ALLOWED_GPE) ||
>  		    !(conf->flags & VXLAN_F_COLLECT_METADATA)) {
> +			NL_SET_ERR_MSG(extack,
> +				       "unsupported combination of extensions");

Since we're redesigning this, let's be more helpful to the user.
There's probably not going to be tremendous improvements here but let's
try at least a bit.

"VXLAN GPE does not support this combination of extensions"

>  			if (local_type & IPV6_ADDR_LINKLOCAL) {
>  				if (!(remote_type & IPV6_ADDR_LINKLOCAL) &&
> -				    (remote_type != IPV6_ADDR_ANY))
> +				    (remote_type != IPV6_ADDR_ANY)) {
> +					NL_SET_ERR_MSG(extack,
> +						       "invalid combination of address scopes");

"invalid combination of local and remote address scopes"

>  					return -EINVAL;
> +				}
>  
>  				conf->flags |= VXLAN_F_IPV6_LINKLOCAL;
>  			} else {
>  				if (remote_type ==
> -				    (IPV6_ADDR_UNICAST | IPV6_ADDR_LINKLOCAL))
> +				    (IPV6_ADDR_UNICAST | IPV6_ADDR_LINKLOCAL)) {
> +					NL_SET_ERR_MSG(extack,
> +						       "invalid combination of address scopes");

ditto

The rest looks good to me. Thanks a lot for doing the work, Matthias!

 Jiri