netdev - Re: [net-next PATCH v2 1/5] introduce IFE action

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Message-ID: <56CF7640.2060202@iogearbox.net>
Date:	Thu, 25 Feb 2016 22:46:40 +0100
From:	Daniel Borkmann <daniel@...earbox.net>
To:	Jamal Hadi Salim <jhs@...atatu.com>, davem@...emloft.net
CC:	netdev@...r.kernel.org, xiyou.wangcong@...il.com,
	alexei.starovoitov@...il.com, john.fastabend@...il.com,
	dj@...izon.com
Subject: Re: [net-next PATCH v2 1/5] introduce IFE action

On 02/25/2016 01:20 PM, Jamal Hadi Salim wrote:
> On 16-02-24 12:37 PM, Daniel Borkmann wrote:
>> On 02/23/2016 01:49 PM, Jamal Hadi Salim wrote:
>>> From: Jamal Hadi Salim <jhs@...atatu.com>
>> [...]
>>> +static const struct nla_policy ife_policy[TCA_IFE_MAX + 1] = {
>>> +    [TCA_IFE_PARMS] = {.len = sizeof(struct tc_ife)},
>>> +    [TCA_IFE_DMAC] = {.type = NLA_BINARY,.len = ETH_ALEN},
>>> +    [TCA_IFE_SMAC] = {.type = NLA_BINARY,.len = ETH_ALEN},
>>
>> This is buggy btw ...
>
> I am sure i cutnpasted that from somewhere. Thanks for catching
> it; I will remove NLA_BINARY ref.

Yeah, NLA_BINARY seems to be a bit of a misleading name. We should
probably audit, if there are more such users already in the tree.

[...]
>> Maybe try to make this lockless in the fast path? Otherwise placing
>> this on ingress / egress (f.e. clsact) doesn't really scale.
>
> Let me think about it. Likely it will be subsequent patches - I just
> want to get this set out first.

Yes, I mean one of the key motivation was "[...] to horizontally scale
packet processing at scope of a chasis or rack [...]". So for people
who don't have that NIC with embedded Cavium processor, they might
already hit scalability issues for encode/decode right there.

Thanks again,
Daniel