netdev - Re: [PATCH net-next] net: qede: flower: validate control flags

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Date: Thu, 25 Apr 2024 09:04:18 +0200
From: Jiri Pirko <jiri@...nulli.us>
To: Asbjørn Sloth Tønnesen <ast@...erby.net>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Ariel Elior <aelior@...vell.com>,
	Manish Chopra <manishc@...vell.com>
Subject: Re: [PATCH net-next] net: qede: flower: validate control flags

Wed, Apr 24, 2024 at 06:43:14PM CEST, ast@...erby.net wrote:
>Hi Jiri,
>
>On 4/24/24 2:52 PM, Jiri Pirko wrote:
>> Wed, Apr 24, 2024 at 03:42:48PM CEST, ast@...erby.net wrote:
>> > This driver currently doesn't support any flower control flags.
>> > 
>> > Implement check for control flags, such as can be set through
>> > `tc flower ... ip_flags frag`.
>> > 
>> > Since qede_parse_flow_attr() are called by both qede_add_tc_flower_fltr()
>> > and qede_flow_spec_to_rule(), as the latter doesn't having access to
>> > extack, then flow_rule_*_control_flags() can't be used in this driver.
>> 
>> Why? You can pass null.
>
>Ah, I see. I hadn't traced that option down through the defines,
>I incorrectly assumed that NL_SET_ERR_MSG* didn't allow NULL.
>
>Currently thinking about doing v2 in this style:
>
>if (flow_rule_match_has_control_flags(rule, extack)) {
>        if (!extack)
>                DP_NOTICE(edev, "Unsupported match on control.flags");
>        return -EOPNOTSUPP;
>}

Looks ok.

>
>pw-bot: changes-requested
>
>-- 
>Best regards
>Asbjørn Sloth Tønnesen
>Network Engineer
>Fiberby - AS42541