[EXTERNAL] [PATCH] examples/l3fwd: fix Rx over not ready port

[Konstantin Ananyev]

> > > > From: Konstantin Ananyev <konstantin.v.ananyev at yandex.ru>
> > > > Sent: Friday, March 1, 2024 10:10 PM
> > > > To: dev at dpdk.org
> > > > Cc: Jerin Jacob <jerinj at marvell.com>; Pavan Nikhilesh Bhagavatula
> > > > <pbhagavatula at marvell.com>; Konstantin Ananyev
> > > > <konstantin.ananyev at huawei.com>; stable at dpdk.org
> > > > Subject: [EXTERNAL] [PATCH] examples/l3fwd: fix Rx over not ready port
> > > >
> > > > Prioritize security for external emails: Confirm sender and content safety
> > > > before clicking links or opening attachments
> > > >
> > > > ----------------------------------------------------------------------
> > > > From: Konstantin Ananyev <konstantin.ananyev at huawei.com>
> > > >
> > > > Running l3fwd in event mode with SW eventdev, service cores
> > > > can start RX before main thread is finished with PMD installation.
> > > > to reproduce:
> > > > ./dpdk-l3fwd --lcores=49,51 -n 6 -a ca:00.0 -s 0x8000000000000 \
> > > > --vdev event_sw0 -- \
> > > > -L -P -p 1  --mode eventdev --eventq-sched=ordered \
> > > > --rule_ipv4=test/l3fwd_lpm_v4_u1.cfg --
> > rule_ipv6=test/l3fwd_lpm_v6_u1.cfg
> > > > \
> > > > --no-numa
> > > >
> > > > At init stage user will most likely see the error message like that:
> > > > ETHDEV: lcore 51 called rx_pkt_burst for not ready port 0
> > > > 0: ./dpdk-l3fwd (rte_dump_stack+0x1f) [15de723]
> > > > ...
> > > > 9: ./dpdk-l3fwd (eal_thread_loop+0x5a2) [15c1324]
> > > > ...
> > > >
> > > > And then all depends how luck/unlucky you are.
> > > > If there are some actual packet in HW RX queue, then the app will most
> > > > likely crash, otherwise it might survive.
> > > > As error message suggests, the problem is that services are started
> > > > before main thread finished with NIC setup and initialization.
> > > > The suggested fix moves services startup after NIC setup phase.
> > > >
> > > > Bugzilla ID: 1390
> > > > Fixes: 8bd537e9c6cf ("examples/l3fwd: add service core setup based on
> > > > caps")
> > > > Cc: stable at dpdk.org
> > > >
> > > > Signed-off-by: Konstantin Ananyev <konstantin.v.ananyev at yandex.ru>
> > > > Signed-off-by: Konstantin Ananyev <konstantin.ananyev at huawei.com>
> 
> Acked-by: Pavan Nikhilesh <pbhagavatula at marvell.com>
> 
> > > > ---
> > > >  examples/l3fwd/main.c | 6 +++++-
> > > >  1 file changed, 5 insertions(+), 1 deletion(-)
> > > >
> > > > diff --git a/examples/l3fwd/main.c b/examples/l3fwd/main.c
> > > > index 3bf28aec0c..d4fb5d1971 100644
> > > > --- a/examples/l3fwd/main.c
> > > > +++ b/examples/l3fwd/main.c
> > > > @@ -1577,7 +1577,6 @@ main(int argc, char **argv)
> > > >  			l3fwd_lkp.main_loop = evt_rsrc->ops.fib_event_loop;
> > > >  		else
> > > >  			l3fwd_lkp.main_loop = evt_rsrc-
> > > > >ops.lpm_event_loop;
> > > > -		l3fwd_event_service_setup();
> > > >  	} else
> > > >  #endif
> > > >  		l3fwd_poll_resource_setup();
> > > > @@ -1609,6 +1608,11 @@ main(int argc, char **argv)
> > > >  		}
> > > >  	}
> > > >
> > > > +#ifdef RTE_LIB_EVENTDEV
> > >
> > > Is the ifdef required?
> >
> > Well, right now l3fwd_event_service_setup() is defined only when
> > RTE_LIB_EVENTDEV is defined, see examples/l3fwd/main.c.
> > So, I suppose, yes.
> >
> 
> My bad I was looking at wrong DPDK version (22.11).

NP, thank you for taking a look.
As a FYI, I filled 2 more bugs on a similar subject (l3fwd event mode):
https://bugs.dpdk.org/show_bug.cgi?id=1393
https://bugs.dpdk.org/show_bug.cgi?id=1391
If you have bandwidth to have a look and provide some feedback,
would be great. 

> 
> > >
> > > > +	if (evt_rsrc->enabled)
> > > > +		l3fwd_event_service_setup();
> > > > +#endif
> > > > +
> > > >  	printf("\n");
> > > >
> > > >  	for (lcore_id = 0; lcore_id < RTE_MAX_LCORE; lcore_id++) {
> > > > --
> > > > 2.35.3