netdev - Re: [PATCHv2 net-next 14/15] net: sch: sch

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Date:   Thu, 14 Dec 2017 13:11:03 -0700
From:   David Ahern <dsahern@...il.com>
To:     Alexander Aring <aring@...atatu.com>, jhs@...atatu.com
Cc:     xiyou.wangcong@...il.com, jiri@...nulli.us, davem@...emloft.net,
        netdev@...r.kernel.org, kernel@...atatu.com,
        David Ahern <dsahern@...il.com>
Subject: Re: [PATCHv2 net-next 14/15] net: sch: sch_cbs: add extack support

On 12/14/17 11:39 AM, Alexander Aring wrote:
> diff --git a/net/sched/sch_cbs.c b/net/sched/sch_cbs.c
> index 8bf6e163d29c..6d09ffd2371e 100644
> --- a/net/sched/sch_cbs.c
> +++ b/net/sched/sch_cbs.c
> @@ -219,14 +219,17 @@ static void cbs_disable_offload(struct net_device *dev,
>  }
>  
>  static int cbs_enable_offload(struct net_device *dev, struct cbs_sched_data *q,
> -			      const struct tc_cbs_qopt *opt)
> +			      const struct tc_cbs_qopt *opt,
> +			      struct netlink_ext_ack *extack)
>  {
>  	const struct net_device_ops *ops = dev->netdev_ops;
>  	struct tc_cbs_qopt_offload cbs = { };
>  	int err;
>  
> -	if (!ops->ndo_setup_tc)
> +	if (!ops->ndo_setup_tc) {
> +		NL_SET_ERR_MSG(extack, "Specified device does support cbs offload");

does *not* support ... ?