netdev - Re: [PATCH RFC 11/11] net/mlx5e: XDP TX xmit more

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: <1473259302.10725.31.camel@edumazet-glaptop3.roam.corp.google.com>
Date:   Wed, 07 Sep 2016 07:41:42 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Saeed Mahameed <saeedm@...lanox.com>
Cc:     iovisor-dev <iovisor-dev@...ts.iovisor.org>,
        netdev@...r.kernel.org, Tariq Toukan <tariqt@...lanox.com>,
        Brenden Blanco <bblanco@...mgrid.com>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Tom Herbert <tom@...bertland.com>,
        Martin KaFai Lau <kafai@...com>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jamal Hadi Salim <jhs@...atatu.com>
Subject: Re: [PATCH RFC 11/11] net/mlx5e: XDP TX xmit more

On Wed, 2016-09-07 at 15:42 +0300, Saeed Mahameed wrote:
> Previously we rang XDP SQ doorbell on every forwarded XDP packet.
> 
> Here we introduce a xmit more like mechanism that will queue up more
> than one packet into SQ (up to RX napi budget) w/o notifying the hardware.
> 
> Once RX napi budget is consumed and we exit napi RX loop, we will
> flush (doorbell) all XDP looped packets in case there are such.

Why is this idea depends on XDP ?

It looks like we could apply it to any driver having one IRQ servicing
one RX and one TX, without XDP being involved.