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From: "Toke Høiland-Jørgensen" <toke@toke.dk>
To: Jonathan Morton <chromatix99@gmail.com>, Pete Heist <pete@heistp.net>
Cc: Cake List <cake@lists.bufferbloat.net>
Subject: Re: [Cake] issue with Cake and bpf filter
Date: Wed, 22 Aug 2018 12:13:29 +0200	[thread overview]
Message-ID: <87in4290ae.fsf@toke.dk> (raw)
In-Reply-To: <F4EA43EB-B359-4302-8764-71F795174DA4@gmail.com>

Jonathan Morton <chromatix99@gmail.com> writes:

>> On 22 Aug, 2018, at 12:51 pm, Pete Heist <pete@heistp.net> wrote:
>> 
>> "math between pkt pointer and 4294901760 is not allowed"
>
> As a possible clue here, 4294901760 == (2^32) - (2^16).
>
> I suspect both errors are being caused by the call to memcpy(). This
> potentially inlines a substantial amount of code which may not be
> eBPF-clean.

Yeah, I think this is a good guess. You could try using
__builtin_memcpy() instead; that may do fewer pointer shenanigans than
the function-header-defined one...

-Toke

  reply	other threads:[~2018-08-22 10:13 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-08-12  8:17 Pete Heist
2018-08-12 10:23 ` Pete Heist
2018-08-12 13:41   ` Jonathan Morton
2018-08-12 19:42     ` Toke Høiland-Jørgensen
2018-08-12 21:34       ` Jonathan Morton
2018-08-13  0:21         ` Jonathan Morton
2018-08-13  5:44           ` Jonathan Morton
2018-08-13 11:01           ` Toke Høiland-Jørgensen
2018-08-21 11:25             ` Toke Høiland-Jørgensen
2018-08-21 21:06               ` Pete Heist
2018-08-21 21:17                 ` Toke Høiland-Jørgensen
2018-08-21 21:46                   ` Pete Heist
2018-08-22  9:49                     ` Toke Høiland-Jørgensen
2018-08-22  9:41                   ` Toke Høiland-Jørgensen
2018-08-22  6:17                 ` Jonathan Morton
2018-08-22  9:30                   ` Pete Heist
2018-08-22  9:37                     ` Toke Høiland-Jørgensen
2018-08-22  9:51                       ` Pete Heist
2018-08-22 10:00                         ` Jonathan Morton
2018-08-22 10:13                           ` Toke Høiland-Jørgensen [this message]
2018-08-22 10:32                             ` Pete Heist

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