Rare project developers

[mc36 <>]

hi,
so i don't run the profiles at all for the feature testing or development, 
except on my stordis... not everything have a profile...:)
so i build special vms with the c-* files from 
https://github.com/rare-freertr/freeRtr/tree/master/misc/p4bf and i used the 
sde9.11 imho...
well, this assembler bug is quite funny, btw the others are too... :)
imho we really should open a ticket at the community forum with these or wait 
until they mention the bugid in the release notes...
thanks,
cs


On 12/22/22 12:55, Alexander Gall wrote:
> On Thu, 15 Dec 2022 13:55:20 +0100, mc36 <> said:
>
> > well, so i don't have a tofino2 at hand so all i can tell you is that
> > the "no dead code elimination" was tested on the modem... according
> > to your finding, that is you had a model-only workaround, i'm afraid
> > to say a thing but worth a try... in the model, all the tests passed
> > after adding this hack to my tofino2 vm...
>
> For all profiles?  Which SDE version did you use? Did you run the
> optimizer?
>
> I'm unable to optimize some of the profiles with
> "--no-dead-code-elimination":
>
> vpls
> geant-testbed
> renater-peering-l3
> nop-mchome
>
> Those all fail with "no phv record" for some of the fields in ig_md
> for all combinations of parameters the optimizer is trying.  That's
> with SDE 9.7.4. With 9.11.1 it gets even worse, e.g.
>
> running /nix/store/vyhk6qd7fg9254dh5dry3hbfdfk6fvfa-bf-sde-model-9.11.1/bin/bf-p4c -I. 
> -I../p4src/ -Xp4c="--no-dead-code-elimination"  -b tofino2 -a t2na 
> -DDUAL_PIPE optimizer821280.p4...
>
> optimizer821280.tofino2/pipe/optimizer821280.bfa:4231: error: No phv record 
> ig_md.bridge_src
> optimizer821280.tofino2/pipe/optimizer821280.bfa:4239: error: No phv record 
> ig_md.bridge_src
> Assembler BUG
> terminate called without an active exception
>
> --
> Alex
>
> > br,
> > cs
>
> > On 12/15/22 13:25, Alexander Gall wrote:
> > > Hi Fr  d  ric
> > >
> > > Thanks for helping to debug the issue with the dropped packets on
> > > Tofino2. Do I understand correctly that disabling dead-code
> > > eliminiation when compiling for Tofino2 is a workaround for this
> > > problem until Intel fixes the bug (P4C-5045) in the compiler?
> > >
> > > If so, I will add the --no-dead-code-elimination flag to the build
> > > procedure for Tofino2-based platforms in the rare-nix repo.
> > >
> > > My previous workaround (commit 09e14ee4 in the rare repo) only worked
> > > on the model but not on the ASIC. I notice that it has already been
> > > removed by the combination of commits 5b0e759 and 3d6d736. That's fine
> > > but I'm not sure if it was intentional (I'm still unhappy with these
> > > automated commits...).