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From: Phil Yang <Phil.Yang@arm.com>
To: Honnappa Nagarahalli <Honnappa.Nagarahalli@arm.com>, "Carrillo, Erik G"
<erik.g.carrillo@intel.com>, "dev@dpdk.org" <dev@dpdk.org>
CC: "drc@linux.vnet.ibm.com" <drc@linux.vnet.ibm.com>, Ruifeng Wang
<Ruifeng.Wang@arm.com>, Dharmik Thakkar <Dharmik.Thakkar@arm.com>, nd
<nd@arm.com>, "stable@dpdk.org" <stable@dpdk.org>, nd <nd@arm.com>,
"jerinj@marvell.com" <jerinj@marvell.com>
Thread-Topic: [PATCH 1/3] eventdev: fix race condition on timer list counter
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Date: Thu, 2 Jul 2020 03:26:30 +0000
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Subject: Re: [dpdk-stable] [PATCH 1/3] eventdev: fix race condition on timer
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Sender: "stable" <stable-bounces@dpdk.org>
> -----Original Message-----
> From: Honnappa Nagarahalli <Honnappa.Nagarahalli@arm.com>
> Sent: Friday, June 19, 2020 2:26 AM
> To: Carrillo, Erik G <erik.g.carrillo@intel.com>; Phil Yang
> <Phil.Yang@arm.com>; dev@dpdk.org
> Cc: drc@linux.vnet.ibm.com; Ruifeng Wang <Ruifeng.Wang@arm.com>;
> Dharmik Thakkar <Dharmik.Thakkar@arm.com>; nd <nd@arm.com>;
> stable@dpdk.org; Honnappa Nagarahalli <Honnappa.Nagarahalli@arm.com>;
> nd <nd@arm.com>
> Subject: RE: [PATCH 1/3] eventdev: fix race condition on timer list count=
er
>=20
> <snip>
>=20
> >
> > Hi Phil,
> >
> > Good catch - thanks for the fix. I've commented in-line:
> >
> > > -----Original Message-----
> > > From: Phil Yang <phil.yang@arm.com>
> > > Sent: Friday, June 12, 2020 6:20 AM
> > > To: dev@dpdk.org; Carrillo, Erik G <erik.g.carrillo@intel.com>
> > > Cc: drc@linux.vnet.ibm.com; honnappa.nagarahalli@arm.com;
> > > ruifeng.wang@arm.com; dharmik.thakkar@arm.com; nd@arm.com;
> > > stable@dpdk.org
> > > Subject: [PATCH 1/3] eventdev: fix race condition on timer list
> > > counter
> > >
> > > The n_poll_lcores counter and poll_lcore array are shared between
> > > lcores and the update of these variables are out of the protection of
> > > spinlock on each lcore timer list. The read-modify-write operations o=
f
> > > the counter are not atomic, so it has the potential of race condition
> > between lcores.
> > >
> > > Use c11 atomics with RELAXED ordering to prevent confliction.
> > >
> > > Fixes: cc7b73ea9e3b ("eventdev: add new software timer adapter")
> > > Cc: erik.g.carrillo@intel.com
> > > Cc: stable@dpdk.org
> > >
> > > Signed-off-by: Phil Yang <phil.yang@arm.com>
> > > Reviewed-by: Dharmik Thakkar <dharmik.thakkar@arm.com>
> > > Reviewed-by: Ruifeng Wang <ruifeng.wang@arm.com>
> > > ---
> > > lib/librte_eventdev/rte_event_timer_adapter.c | 16 ++++++++++++----
> > > 1 file changed, 12 insertions(+), 4 deletions(-)
> > >
> > > diff --git a/lib/librte_eventdev/rte_event_timer_adapter.c
> > > b/lib/librte_eventdev/rte_event_timer_adapter.c
> > > index 005459f..6a0e283 100644
> > > --- a/lib/librte_eventdev/rte_event_timer_adapter.c
> > > +++ b/lib/librte_eventdev/rte_event_timer_adapter.c
> > > @@ -583,6 +583,7 @@ swtim_callback(struct rte_timer *tim)
> > > uint16_t nb_evs_invalid =3D 0;
> > > uint64_t opaque;
> > > int ret;
> > > +int n_lcores;
> > >
> > > opaque =3D evtim->impl_opaque[1];
> > > adapter =3D (struct rte_event_timer_adapter *)(uintptr_t)opaque; @@
> > > -605,8 +606,12 @@ swtim_callback(struct rte_timer *tim)
> > > "with immediate expiry value");
> > > }
> > >
> > > -if (unlikely(rte_atomic16_test_and_set(&sw-
> > > >in_use[lcore].v)))
> > > -sw->poll_lcores[sw->n_poll_lcores++] =3D lcore;
> > > +if (unlikely(rte_atomic16_test_and_set(&sw-
> > > >in_use[lcore].v))) {
> > > +n_lcores =3D __atomic_fetch_add(&sw->n_poll_lcores,
> > > 1,
> > > +__ATOMIC_RELAXED);
> Since this commit will be back ported, we should prefer to use rte_atomic
> APIs for this commit. Otherwise, we will have a mix of rte_atomic and C11
> APIs.
> My suggestion is to fix this bug using rte_atomic so that backported code=
will
> have only rte_atomic APIs. Add another commit (if required) in this serie=
s to
> make the bug fix use C11 APIs (this commit will not be backported).
Hi Honnappa,
It doesn't have an applicable rte_atomic_XXX API to fix this issue.
The rte_atomic32_inc doesn't return the original value of the input paramet=
er and rte_atomic32_add_return can only return the new value.
Meanwhile, the rte_timer_alt_manage & rte_timer_stop_all API not support rt=
e_atomic type parameters. We might need to rewrite these two APIs if we wan=
t to use rte_atomic operations for n_pol_lcores and poll_lcores array.
So, a better solution could be to backport the entire c11 solution to stabl=
e releases.
Thanks,
Phil
>=20
> >
> > Just a nit, but let's align the continued line with the opening parenth=
eses in
> > this location and below. With these changes:
> >
> > Acked-by: Erik Gabriel Carrillo <erik.g.carrillo@intel.com>
> >
> > > +__atomic_store_n(&sw->poll_lcores[n_lcores],
> > > lcore,
> > > +__ATOMIC_RELAXED);
> > > +}
> > > } else {
> > > EVTIM_BUF_LOG_DBG("buffered an event timer expiry event");
> > >
> > > @@ -1011,6 +1016,7 @@ __swtim_arm_burst(const struct
> > > rte_event_timer_adapter *adapter,
> > > uint32_t lcore_id =3D rte_lcore_id();
> > > struct rte_timer *tim, *tims[nb_evtims];
> > > uint64_t cycles;
> > > +int n_lcores;
> > >
> > > #ifdef RTE_LIBRTE_EVENTDEV_DEBUG
> > > /* Check that the service is running. */ @@ -1033,8 +1039,10 @@
> > > __swtim_arm_burst(const struct rte_event_timer_adapter *adapter,
> > > if (unlikely(rte_atomic16_test_and_set(&sw->in_use[lcore_id].v))) {
> > > EVTIM_LOG_DBG("Adding lcore id =3D %u to list of lcores to
> > poll",
> > > lcore_id);
> > > -sw->poll_lcores[sw->n_poll_lcores] =3D lcore_id;
> > > -++sw->n_poll_lcores;
> > > +n_lcores =3D __atomic_fetch_add(&sw->n_poll_lcores, 1,
> > > +__ATOMIC_RELAXED);
> > > +__atomic_store_n(&sw->poll_lcores[n_lcores], lcore_id,
> > > +__ATOMIC_RELAXED);
> > > }
> > >
> > > ret =3D rte_mempool_get_bulk(sw->tim_pool, (void **)tims,
> > > --
> > > 2.7.4
>=20