netdev - Re: [PATCH net-next 2/2] net: vxlan: vxlan_core.c: Add extack support to vxlan_fdb

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Date:   Fri, 22 Apr 2022 12:37:01 -0600
From:   David Ahern <dsahern@...nel.org>
To:     Alaa Mohamed <eng.alaamohamedsoliman.am@...il.com>
Cc:     netdev@...r.kernel.org, outreachy@...ts.linux.dev,
        roopa@...dia.com, roopa.prabhu@...il.com, jdenham@...hat.com,
        sbrivio@...hat.com
Subject: Re: [PATCH net-next 2/2] net: vxlan: vxlan_core.c: Add extack
 support to vxlan_fdb_delet

On Tue, Apr 19, 2022 at 04:37:18PM +0200, Alaa Mohamed wrote:
> diff --git a/drivers/net/vxlan/vxlan_core.c b/drivers/net/vxlan/vxlan_core.c
> index cf2f60037340..4ecbb5878fe2 100644
> --- a/drivers/net/vxlan/vxlan_core.c
> +++ b/drivers/net/vxlan/vxlan_core.c
> @@ -1129,18 +1129,20 @@ static void vxlan_fdb_dst_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f,
> 
>  static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
>  			   union vxlan_addr *ip, __be16 *port, __be32 *src_vni,
> -			   __be32 *vni, u32 *ifindex, u32 *nhid)
> +			   __be32 *vni, u32 *ifindex, u32 *nhid, struct netlink_ext_ack *extack)
>  {
>  	struct net *net = dev_net(vxlan->dev);
>  	int err;
> 
>  	if (tb[NDA_NH_ID] && (tb[NDA_DST] || tb[NDA_VNI] || tb[NDA_IFINDEX] ||
>  	    tb[NDA_PORT]))
> +		NL_SET_ERR_MSG(extack, "Missing required arguments");

That's a misleading error message; I think it should be something like:
		NL_SET_ERR_MSG(extack, "DST, VNI, ifindex and port are mutually exclusive with NH_ID");

>  		return -EINVAL;
> 
>  	if (tb[NDA_DST]) {
>  		err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
>  		if (err)
> +			NL_SET_ERR_MSG(extack, "Unsupported address family");
>  			return err;
>  	} else {
>  		union vxlan_addr *remote = &vxlan->default_dst.remote_ip;