netdev - Re: [PATCH 1/5] netlink: extended ACK reporting

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Date:   Sat, 8 Apr 2017 14:36:39 -0400
From:   David Ahern <dsa@...ulusnetworks.com>
To:     Johannes Berg <johannes@...solutions.net>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org
Cc:     pablo@...filter.org, Jamal Hadi Salim <jhs@...atatu.com>,
        Jiri Benc <jbenc@...hat.com>, jiri@...nulli.us,
        Johannes Berg <johannes.berg@...el.com>
Subject: Re: [PATCH 1/5] netlink: extended ACK reporting

On 4/8/17 1:48 PM, Johannes Berg wrote:
> diff --git a/include/linux/netlink.h b/include/linux/netlink.h
> index da14ab61f363..47562e940e9c 100644
> --- a/include/linux/netlink.h
> +++ b/include/linux/netlink.h
> @@ -62,11 +62,41 @@ netlink_kernel_create(struct net *net, int unit, struct netlink_kernel_cfg *cfg)
>  	return __netlink_kernel_create(net, unit, THIS_MODULE, cfg);
>  }
>  
> +/**
> + * struct netlink_ext_ack - netlink extended ACK report struct
> + * @_msg: message string to report - don't access directly, use
> + *	%NL_SET_ERR_MSG
> + * @bad_attr: attribute with error
> + * @missing_attr: number of missing attr (or 0)
> + * @cookie: cookie data to return to userspace (for success)
> + * @cookie_len: actual cookie data length
> + */
> +struct netlink_ext_ack {
> +	const char *_msg;
> +	const struct nlattr *bad_attr;
> +	u16 missing_attr;
> +	u8 cookie[NETLINK_MAX_COOKIE_LEN];
> +	u8 cookie_len;
> +};
> +

I think v3 is in your future ...

/home/dsa/kernel-4.git/include/linux/netlink.h:78:12: error:
‘NETLINK_MAX_COOKIE_LEN’ undeclared here (not in a function)
  u8 cookie[NETLINK_MAX_COOKIE_LEN];
            ^

it's defined in patch 3; needed in patch 1