netdev - RE: XDP question - how much can BPF change in xdp

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] [day] [month] [year] [list]

Date:   Tue, 1 Nov 2016 07:06:02 +0000
From:   "Mintz, Yuval" <Yuval.Mintz@...ium.com>
To:     Tom Herbert <tom@...bertland.com>
CC:     netdev <netdev@...r.kernel.org>
Subject: RE: XDP question - how much can BPF change in xdp_buff?

> BTW, are we considering some offload where the eBPF would return  a set of
> changes [based on some pre-set capabilities set by driver] done on buffer and let
> the HW offload those?
> 
> I understand end goal is eBPF hw-offloading, but seems like there are a lot of
> existing offload facilities that might be leveraged.

On second thought, given that the program is likely to change only a
small set of fields [as opposed to building whole new buffers],
probably fixing the csum isn't going to be much costlier [if at all] then the logic
that would be required to determine whether the device would be able to offload
it.