unable to use BPF Just-In-Time compiler

[KrishnamRaju ErapaRaju]

Thanks Navdeep,  Now I understood that if any C file want to use a specific 'options' (defined in the config file), then its corresponding .h file(found at sys/conf/options<arch>) needs to be included.

#include "opt_bpf.h"

My issue resolved after adding the above line in all C files which used BPF_FILTER macro.

Thanks,
Krishna.

-----Original Message-----
From: Navdeep Parhar [mailto:nparhar at gmail.com] On Behalf Of Navdeep Parhar
Sent: Tuesday, September 20, 2016 12:04 PM
To: KrishnamRaju ErapaRaju <Krishna2 at chelsio.com>
Cc: Bjoern A. Zeeb <bzeeb-lists at lists.zabbadoz.net>; freebsd-net at freebsd.org
Subject: Re: unable to use BPF Just-In-Time compiler

Use "options BPF_JITTER" in your kernconf.  If this is new code you must include opt_bpf.h in it.  If it's part of a module then the module's makefile must have opt_bpf.h in its SRCS.  When in doubt take a look at all the obt_bpf.h in your obj tree after the buildkernel and see if they have "#define BPF_JITTER 1" or not.  Remove all opt_bpf.h files in the obj tree and retry buildkernel if all else fails.

Regards,
Navdeep

On Mon, Sep 19, 2016 at 10:41:38AM +0000, KrishnamRaju ErapaRaju wrote:
> Thanks for your response Bjeorn.
> 
> I added "device         bpf_jitter"  line as you suggested, but not luck.
> Still no code under BPF_JITTER macro is executing.
> 
> Please help me  enabling JIT compiler.
> 
> Thanks,
> Krishna.
> -----Original Message-----
> From: Bjoern A. Zeeb [mailto:bzeeb-lists at lists.zabbadoz.net]
> Sent: Sunday, September 18, 2016 2:41 AM
> To: KrishnamRaju ErapaRaju <Krishna2 at chelsio.com>
> Cc: freebsd-net at freebsd.org
> Subject: Re: unable to use BPF Just-In-Time compiler
> 
> 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/05
> > 86
> > 03.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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