netdev - Re: [RFC PATCH 0/5] Add driver bpf hook for early packet drop

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]

Date:	Sat, 2 Apr 2016 22:41:04 -0700
From:	Brenden Blanco <bblanco@...mgrid.com>
To:	Tom Herbert <tom@...bertland.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Linux Kernel Network Developers <netdev@...r.kernel.org>,
	Alexei Starovoitov <alexei.starovoitov@...il.com>,
	gerlitz@...lanox.com, Daniel Borkmann <daniel@...earbox.net>,
	john fastabend <john.fastabend@...il.com>,
	Jesper Dangaard Brouer <brouer@...hat.com>
Subject: Re: [RFC PATCH 0/5] Add driver bpf hook for early packet drop

On Sat, Apr 02, 2016 at 12:47:16PM -0400, Tom Herbert wrote:
> Very nice! Do you think this hook will be sufficient to implement a
> fast forward patch also?
That is the goal, but more work needs to be done of course. It won't be
possible with just a single pseudo skb, the driver will need a fast way to get
batches of pseudo skbs (per core?) through from rx to tx. In mlx4 for
instance, either the skb needs to be much more complete to be handled from the
start of mlx4_en_xmit(), or that function would need to be split so that the
fast tx could start midway through.

Or, skb allocation just gets much faster. Then it should be pretty
straightforward.
> 
> Tom