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 for Android: free password hash cracker in your pocket
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <bcb33ba7-b2a3-1fe7-64b2-1e15203e2cce@nbd.name>
Date:   Sat, 12 Nov 2022 12:13:15 +0100
From:   Felix Fietkau <nbd@....name>
To:     Jakub Kicinski <kuba@...nel.org>,
        Vladimir Oltean <olteanv@...il.com>
Cc:     netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>, Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v3 1/4] net: dsa: add support for DSA rx
 offloading via metadata dst

On 12.11.22 05:40, Jakub Kicinski wrote:
> On Sat, 12 Nov 2022 01:37:14 +0200 Vladimir Oltean wrote:
>> Jakub, what do you think? Refcounting or no refcounting?
> 
> I would not trust my word over Felix's.. but since you asked I'd vote
> for refcounted. There's probably a handful of low level redirects
> (generic XDP, TC, NFT) that can happen and steal the packet, and
> keep it alive for a while. I don't think they will all necessarily
> clear the dst.
I don't really see a valid use case in running generic XDP, TC and NFT 
on a DSA master dealing with packets before the tag receive function has 
been run. And after the tag has been processed, the metadata DST is 
cleared from the skb.
How about this: I send a v4 which uses skb_dst_drop instead of 
skb_dst_set, so that other drivers can use refcounting if it makes sense 
for them. For mtk_eth_soc, I prefer to leave out refcounting for 
performance reasons.
Is that acceptable to you guys?

- Felix

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ