linux-kernel - Re: [Bridge] [PATCH iproute2-next 2/2] bridge: fdb: enable FDB blackhole feature

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Date:   Thu, 29 Sep 2022 18:14:11 +0200
From:   netdev@...io-technology.com
To:     Stephen Hemminger <stephen@...workplumber.org>
Cc:     davem@...emloft.net, kuba@...nel.org, Andrew Lunn <andrew@...n.ch>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Nikolay Aleksandrov <razor@...ckwall.org>,
        Kurt Kanzenbach <kurt@...utronix.de>,
        Eric Dumazet <edumazet@...gle.com>,
        linux-kselftest@...r.kernel.org,
        Joachim Wiberg <troglobit@...il.com>,
        Shuah Khan <shuah@...nel.org>,
        Ivan Vecera <ivecera@...hat.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Ido Schimmel <idosch@...dia.com>,
        bridge@...ts.linux-foundation.org,
        Russell King <linux@...linux.org.uk>,
        linux-arm-kernel@...ts.infradead.org,
        Roopa Prabhu <roopa@...dia.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Woojung Huh <woojung.huh@...rochip.com>,
        Landen Chao <Landen.Chao@...iatek.com>,
        Jiri Pirko <jiri@...nulli.us>, Amit Cohen <amcohen@...dia.com>,
        Christian Marangi <ansuelsmth@...il.com>,
        Hauke Mehrtens <hauke@...ke-m.de>,
        Hans Schultz <schultz.hans@...il.com>,
        Sean Wang <sean.wang@...iatek.com>,
        DENG Qingfang <dqfext@...il.com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        linux-mediatek@...ts.infradead.org,
        Matthias Brugger <matthias.bgg@...il.com>,
        Yuwei Wang <wangyuweihx@...il.com>,
        Petr Machata <petrm@...dia.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, UNGLinuxDriver@...rochip.com,
        Vladimir Oltean <olteanv@...il.com>,
        Florent Fourcot <florent.fourcot@...irst.fr>
Subject: Re: [Bridge] [PATCH iproute2-next 2/2] bridge: fdb: enable FDB
 blackhole feature

On 2022-09-29 17:43, Stephen Hemminger wrote:
> On Thu, 29 Sep 2022 17:21:37 +0200
> Hans Schultz <netdev@...io-technology.com> wrote:
> 
>> 
>> @@ -493,6 +496,8 @@ static int fdb_modify(int cmd, int flags, int 
>> argc, char **argv)
>>  			req.ndm.ndm_flags |= NTF_EXT_LEARNED;
>>  		} else if (matches(*argv, "sticky") == 0) {
>>  			req.ndm.ndm_flags |= NTF_STICKY;
>> +		} else if (matches(*argv, "blackhole") == 0) {
>> +			ext_flags |= NTF_EXT_BLACKHOLE;
>>  		} else {
>>  			if (strcmp(*argv, "to") == 0)
>>  				NEXT_ARG();
> 
> The parsing of flags is weird here, most of the flags are compared with 
> strcmp()
> but some use matches()..  I should have used strcmp() all the time; but 
> at the
> time did not realize what kind of confusion matches() can cause.

Maybe just change all of them then, and then how about using strncmp() 
and maybe also strnlen() instead?