netdev - Re: [PATCH net-next] net: dsa: don't call ptp_classify_raw() if switch doesn't provide RX timestamping

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <3fd85490-0a78-2d2e-0156-22ca209420af@gmail.com>
Date:   Fri, 9 Dec 2022 16:08:34 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Vladimir Oltean <vladimir.oltean@....com>, netdev@...r.kernel.org
Cc:     Andrew Lunn <andrew@...n.ch>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Richard Cochran <richardcochran@...il.com>
Subject: Re: [PATCH net-next] net: dsa: don't call ptp_classify_raw() if
 switch doesn't provide RX timestamping

On 12/9/22 09:58, Vladimir Oltean wrote:
> ptp_classify_raw() is not exactly cheap, since it invokes a BPF program
> for every skb in the receive path. For switches which do not provide
> ds->ops->port_rxtstamp(), running ptp_classify_raw() provides precisely
> nothing, so check for the presence of the function pointer first, since
> that is much cheaper.
> 
> Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>

Reviewed-by: Florian Fainelli <f.fainelli@...il.com>
-- 
Florian