unable to use BPF Just-In-Time compiler

[Bjoern A. Zeeb]

On 15 Sep 2016, at 5:32, KrishnamRaju ErapaRaju wrote:

> Hi,
>
> I want to use BPF JIT Kernel APIs in FreeBSD(like: bpf_jitter(), 
> etc..), for implementing TCP connection packet filtering.
>
> I have followed below instructions as specified in: 
> https://lists.freebsd.org/pipermail/freebsd-current/2005-December/058603.html
>
> STEPS followed:
> ---------------------
> cp /usr/src/sys/amd64/conf/GENERIC /usr/src/sys/amd64/conf/MYKERNEL
>
> And added below line in MYKERNEL config file.
>         options BPF_JITTER

I think you want

device         bpf_jitter

The options line to my understanding only turns it on by default.

>
> make buildkernel KERNCONF=MYKERNEL
> make installkernel KERNCONF=MYKERNEL
> reboot
>
> But after reboot the flag BPF_JITTER is not getting enabled(all the 
> code inside "#ifdef BPF_JITTER" is not getting executed).
>
> Am I missing something?
>
> Also it looks like there are not many updates to BPF JIT code since 
> 2005, is it stable? anyone using it?
>
> Thanks,
> Krishna.
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