From: Daniel Borkmann <daniel@iogearbox.net>
To: Thomas Graf <tgraf@suug.ch>, Tom Herbert <tom@herbertland.com>
Cc: "David S. Miller" <davem@davemloft.net>,
Linux Kernel Network Developers <netdev@vger.kernel.org>,
Kernel Team <kernel-team@fb.com>,
Tariq Toukan <tariqt@mellanox.com>,
Brenden Blanco <bblanco@plumgrid.com>,
Alexei Starovoitov <alexei.starovoitov@gmail.com>,
Eric Dumazet <eric.dumazet@gmail.com>,
Jesper Dangaard Brouer <brouer@redhat.com>
Subject: Re: [PATCH RFC 1/3] xdp: Infrastructure to generalize XDP
Date: Wed, 21 Sep 2016 01:22:54 +0200 [thread overview]
Message-ID: <57E1C4CE.7000104@iogearbox.net> (raw)
In-Reply-To: <20160920230927.GG3291@pox.localdomain>
On 09/21/2016 01:09 AM, Thomas Graf wrote:
> On 09/20/16 at 03:49pm, Tom Herbert wrote:
>> On Tue, Sep 20, 2016 at 3:44 PM, Thomas Graf <tgraf@suug.ch> wrote:
>>> On 09/20/16 at 03:00pm, Tom Herbert wrote:
>>>> +static inline int __xdp_hook_run(struct list_head *list_head,
>>>> + struct xdp_buff *xdp)
>>>> +{
>>>> + struct xdp_hook_ops *elem;
>>>> + int ret = XDP_PASS;
>>>> +
>>>> + list_for_each_entry(elem, list_head, list) {
>>>> + ret = elem->hook(elem->priv, xdp);
>>>> + if (ret != XDP_PASS)
>>>> + break;
>>>> + }
>>>
>>> Walking over a linear list? Really? :-) I thought this was supposed
>>> to be fast, no compromises made.
>>
>> Can you suggest an alternative?
>
> Single BPF program that encodes whatever logic is required. This is
> what BPF is for. If it absolutely has to run two programs in sequence
> then it can still do that even though I really don't see much of a
> point of doing that in a high performance environment.
Agreed, if there's one thing I would change in cls_bpf, then it's getting
rid of the (uapi unfortunately) list of classifiers and just make it a
single one, because that's all that is needed, and chaining/pipelining
can be done via tail calls for example. This whole list + callback likely
also makes things slower. Why not let more drivers come first to support
the current xdp model we have, and then we can move common parts to the
driver-independent core code?
> I'm not even sure yet I understand full purpose of this yet ;-)
next prev parent reply other threads:[~2016-09-20 23:22 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-20 22:00 [PATCH RFC 0/3] xdp: Generalize XDP Tom Herbert
2016-09-20 22:00 ` [PATCH RFC 1/3] xdp: Infrastructure to generalize XDP Tom Herbert
2016-09-20 22:37 ` Eric Dumazet
2016-09-20 22:40 ` Tom Herbert
2016-09-20 22:44 ` Thomas Graf
2016-09-20 22:49 ` Tom Herbert
2016-09-20 23:09 ` Thomas Graf
2016-09-20 23:18 ` Tom Herbert
2016-09-20 23:43 ` Thomas Graf
2016-09-20 23:59 ` Tom Herbert
2016-09-21 0:13 ` Alexei Starovoitov
2016-09-21 11:55 ` Thomas Graf
2016-09-21 14:19 ` Tom Herbert
2016-09-21 14:48 ` Thomas Graf
2016-09-21 15:08 ` Tom Herbert
2016-09-21 19:56 ` Jesper Dangaard Brouer
2016-09-22 13:14 ` Jesper Dangaard Brouer
2016-09-22 14:46 ` Eric Dumazet
2016-09-21 15:39 ` Alexei Starovoitov
2016-09-21 17:26 ` Jakub Kicinski
2016-09-20 23:22 ` Daniel Borkmann [this message]
2016-09-21 0:01 ` Alexei Starovoitov
2016-09-21 6:39 ` Jesper Dangaard Brouer
2016-09-21 8:42 ` Daniel Borkmann
2016-09-21 15:44 ` Alexei Starovoitov
2016-09-21 17:26 ` Jakub Kicinski
2016-09-21 17:39 ` Tom Herbert
2016-09-21 18:45 ` Jakub Kicinski
2016-09-21 18:50 ` Tom Herbert
2016-09-21 18:54 ` Jakub Kicinski
2016-09-21 18:58 ` Thomas Graf
2016-09-23 11:13 ` Jamal Hadi Salim
2016-09-23 13:00 ` Jesper Dangaard Brouer
2016-09-23 14:26 ` Alexei Starovoitov
2016-09-25 11:32 ` Jamal Hadi Salim
2016-09-23 14:14 ` Tom Herbert
2016-09-25 12:29 ` Jamal Hadi Salim
2016-09-20 22:00 ` [PATCH RFC 2/3] mlx4: Change XDP/BPF to use generic XDP infrastructure Tom Herbert
2016-09-20 22:00 ` [PATCH RFC 3/3] netdevice: Remove obsolete xdp_netdev_command Tom Herbert
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