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References: <20230301030610.49468-1-fengchengwen@huawei.com>
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<18c5b676-ae72-e646-89af-d6cd636d923f@yandex.ru>
<5b40049f-6f22-fc3f-b13e-da1793c2fd1a@amd.com>
<9092fdae9c1d4c53a00a8f23eb1129ec@huawei.com>
<0effdaa9-5045-0635-775c-6e1eda0d5dba@amd.com>
<CACZ4nhtvtRZQcBaLKQ5k76VSVo8F9NWWbrJbnUZV5JNO6N4MoA@mail.gmail.com>
<e3c8dd66f915462e9b58defdb4e5aa1e@huawei.com>
<9dc5d714-07a4-c32e-e557-efe8e7fe2d16@huawei.com>
<5b110017-8679-4603-5c25-742ed83e4bda@amd.com>
<16463f17-6f71-308b-c27b-9134346002c9@huawei.com>
<d529cca9c82048529bbad695e59579b0@huawei.com>
In-Reply-To: <d529cca9c82048529bbad695e59579b0@huawei.com>
From: Ajit Khaparde <ajit.khaparde@broadcom.com>
Date: Wed, 8 Mar 2023 18:05:06 -0800
Message-ID: <CACZ4nhshWoKaML-yjgkax91vRP8di5rk0Nf-ymj_95-CB5zcXg@mail.gmail.com>
Subject: Re: [PATCH 1/5] ethdev: fix race-condition of proactive error
handling mode
To: Konstantin Ananyev <konstantin.ananyev@huawei.com>
Cc: Fengchengwen <fengchengwen@huawei.com>, Ferruh Yigit <ferruh.yigit@amd.com>,
Konstantin Ananyev <konstantin.v.ananyev@yandex.ru>,
Thomas Monjalon <thomas@monjalon.net>,
Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>, "dev@dpdk.org" <dev@dpdk.org>
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On Tue, Mar 7, 2023 at 4:40=E2=80=AFAM Konstantin Ananyev
<konstantin.ananyev@huawei.com> wrote:
>
>
>
> > >>>>>>>>>>> In the proactive error handling mode, the PMD will set the =
data path
> > >>>>>>>>>>> pointers to dummy functions and then try recovery, in this =
period the
> > >>>>>>>>>>> application may still invoking data path API. This will int=
roduce a
> > >>>>>>>>>>> race-condition with data path which may lead to crash [1].
> > >>>>>>>>>>>
> > >>>>>>>>>>> Although the PMD added delay after setting data path pointe=
rs to cover
> > >>>>>>>>>>> the above race-condition, it reduces the probability, but i=
t doesn't
> > >>>>>>>>>>> solve the problem.
> > >>>>>>>>>>>
> > >>>>>>>>>>> To solve the race-condition problem fundamentally, the foll=
owing
> > >>>>>>>>>>> requirements are added:
> > >>>>>>>>>>> 1. The PMD should set the data path pointers to dummy funct=
ions after
> > >>>>>>>>>>> report RTE_ETH_EVENT_ERR_RECOVERING event.
> > >>>>>>>>>>> 2. The application should stop data path API invocation whe=
n process
> > >>>>>>>>>>> the RTE_ETH_EVENT_ERR_RECOVERING event.
> > >>>>>>>>>>> 3. The PMD should set the data path pointers to valid funct=
ions before
> > >>>>>>>>>>> report RTE_ETH_EVENT_RECOVERY_SUCCESS event.
> > >>>>>>>>>>> 4. The application should enable data path API invocation w=
hen process
> > >>>>>>>>>>> the RTE_ETH_EVENT_RECOVERY_SUCCESS event.
> > >>>>>>>>>>>
> > >>>>>>>>>
> > >>>>>>>>> How this is solving the race-condition, by pushing responsibi=
lity to
> > >>>>>>>>> stop data path to application?
> > >>>>>>>>
> > >>>>>>>> Exactly, it becomes application responsibility to make sure da=
ta-path is
> > >>>>>>>> stopped/suspended before recovery will continue.
> > >>>>>>>>
> > >>>>>>>
> > >>>>>>> From documentation of the feature:
> > >>>>>>>
> > >>>>>>> ``
> > >>>>>>> Because the PMD recovers automatically,
> > >>>>>>> the application can only sense that the data flow is disconnect=
ed for a
> > >>>>>>> while and the control API returns an error in this period.
> > >>>>>>>
> > >>>>>>> In order to sense the error happening/recovering, as well as to=
restore
> > >>>>>>> some additional configuration, three events are available:
> > >>>>>>> ``
> > >>>>>>>
> > >>>>>>> It looks like initial design is to use events mainly inform app=
lication
> > >>>>>>> about what happened and mainly for re-configuration.
> > >>>>>>>
> > >>>>>>> Although I am don't disagree to involve the application, I am n=
ot sure
> > >>>>>>> that is part of current design.
> > >>>>>>
> > >>>>>> I thought we all agreed that initial design contain some fallaci=
es that
> > >>>>>> need to fixed, no?
> > >>>>>> Statement that with current rte_ethdev design error recovery can=
be done
> > >>>>>> without interaction with the app (to stop/suspend data/control p=
ath)
> > >>>>>> is the main one I think.
> > >>>>>> It needs some interaction with app layer, one way or another.
> > >>>>>>
> > >>>>>>>>>
> > >>>>>>>>> What if application is not interested in recovery modes at al=
l and not
> > >>>>>>>>> registered any callback for the recovery?
> > >>>>>>>>
> > >>>>>>>>
> > >>>>>>>> Are you saying there is no way for application to disable
> > >>>>>>>> automatic recovery in PMD if it is not interested
> > >>>>>>>> (or can't full-fill per-requesties for it)?
> > >>>>>>>> If so, then yes it is a problem and we need to fix it.
> > >>>>>>>> I assumed that such mechanism to disable unwanted events alrea=
dy exists,
> > >>>>>>>> but I can't find anything.
> > >>>>>>>> Wonder what would be the easiest way here - can PMD make a dec=
ision
> > >>>>>>>> based on callback return value, or do we need a new API to
> > >>>>>>>> enable/disable callbacks, or ...?
> > >>>>>>>>
> > >>>>>>>>
> > >>>>>>>
> > >>>>>>> As far as I can see automatic recovery is not configurable by a=
pp.
> > >>>>>>>
> > >>>>>>> But that is not all, PMD sends events to application but PMD ca=
n't know
> > >>>>>>> if application is handling them or not, so with current design =
PMD can't
> > >>>>>>> rely on to app.
> > >>>>>>
> > >>>>>> Well, PMD invokes user provided callback.
> > >>>>>> One way to fix that problem - if there is no callback provided,
> > >>>>>> or callback returns an error code - PMD can assume that recovery
> > >>>>>> should not be done.
> > >>>>>> That is probably not the best design choice, but at least it wil=
l allow
> > >>>>>> to fix the problem without too many changes and introducing new =
API.
> > >>>>>> That could be sort of a 'quick fix'.
> > >>>>>> In a meanwhile we can think about new/better approach for that.
> > >>>>>>
> > >>>>>
> > >>>>> -rc2 for 23.03 is a few days away.
> > >>>>>
> > >>>>> What do you think to have 'quick fix' as modifying how driver upd=
ates
> > >>>>> burst ops to prevent the race condition, for this release?
> > >>
> > >> The 'quick fix', do you mean only update function pointer (without r=
xq setting) ?
> > >> Currently the PMDs which announced support "proactive error handling=
mode" already
> > >> do this.
> > >>
> > >
> > > Yes.
> > > I checked hns3, it does as you said, hns3_eth_dev_fp_ops_config()'
> > > updates all fields in 'rte_eth_fp_ops' but only function pointer seem=
s
> > > changed in the driver, resulting only function pointers to be updated=
.
> > >
> > > The discussion about race condition started with patch [1], which
> > > mentions a crash because of a race condition. Later in discussions,
> > > recovery event given as a sample for where the race can occur, that i=
s
> > > why we are here.
> > >
> > > But after above info, although there is race condition and a bigger
> > > update (that needs application involvement) is required for recovery
> > > mechanism, there is no crash and NO 'quick fix' is required for recov=
ery.
> > >
> > > @Konstantin, @Chengwen, can you please confirm above understanding is
> > > correct?
> >
> > Yes, that's what.
>
> Yes, I think with Chengwen patch the race condition problem should be fix=
ed.
> Though for that user has to provide a properly implemented callback.
> What is not currently addressed - user can not disable this auto-recovery=
procedure on his will.
> So if user will not provide a proper call-back the recovery can still pro=
ceed and race can happen.
Ideally the user or the application should participate in the recovery
to prevent more catastrophic results which may need a system reboot.
Not all scenarios are recoverable, but based on implementation that
could be a very small percentage.
But the application awareness and participation as an end goal is a
good idea nevertheless.
>
> >
> > >
> > >
> > >
> > > [1]
> > > https://patches.dpdk.org/project/dpdk/patch/20230220060839.1267349-2-=
ashok.k.kaladi@intel.com/
> > >
> > >>>>>
> > >>>>> And plan a design update for the next release?
> > >>>> +1 on the overall approach.
> > >>>
> > >>> Yep, agree.
> > >>
> > >> Hope for better solution.
> > >> And also, I notice only the openvswitch (from all open-source softwa=
re which based-on DPDK)
> > >> registers RTE_ETH_EVENT_INTR_RESET callback .
> > >>
> > >> Therefore, hope we build a recovery framework at the DPDK SDK level =
and be compatible
> > >> with RTE_ETH_EVENT_INTR_RESET and RTE_ETH_EVENT_ERR_RECOVERING mecha=
nism.
> > >>
> > >>>
> > >>>>
> > >>>>>
> > >>>>>
> > >>>>>>>
> > >>>>>>>>> I think driver should not rely on application for this, unles=
s
> > >>>>>>>>> application explicitly says (to driver) that it is handling r=
ecovery,
> > >>>>>>>>> right now there is no way for driver to know this.
> > >>>>>>>>
> > >>>>>>>> I think it is visa-versa:
> > >>>>>>>> application should not enable auto-recovery if it can't meet
> > >>>>>>>> per-requeststies for it (provide appropriate callback).
> > >>>>>>>>
> > >>>>>>>
> > >>>>>>> I agree on above, we are saying similar thing in different pers=
pective.
> > >>>>>>
> > >>>>>> Ok, that's good we are on the same page.
> > >>>>>>
> > >>>>>>
> > >>>>>>>
> > >>>>>>>>
> > >>>>>>>>>
> > >>>>>>>>>>> Also, this patch introduce a driver internal function
> > >>>>>>>>>>> rte_eth_fp_ops_setup which used as an help function for PMD=
.
> > >>>>>>>>>>>
> > >>>>>>>>>>> [1]
> > >>>>>>>>>>> http://patchwork.dpdk.org/project/dpdk/patch/20230220060839=
.1267349-2-ashok.k.kaladi@intel.com/
> > >>>>>>>>>>>
> > >>>>>>>>>>> Fixes: eb0d471a8941 ("ethdev: add proactive error handling =
mode")
> > >>>>>>>>>>> Cc: stable@dpdk.org
> > >>>>>>>>>>>
> > >>>>>>>>>>> Signed-off-by: Chengwen Feng <fengchengwen@huawei.com>
> > >>>>>>>>>>> ---
> > >>>>>>>>>>> doc/guides/prog_guide/poll_mode_drv.rst | 20 +++++++-----=
----
> > >>>>>>>>>>> lib/ethdev/ethdev_driver.c | 8 +++++++
> > >>>>>>>>>>> lib/ethdev/ethdev_driver.h | 10 ++++++++
> > >>>>>>>>>>> lib/ethdev/rte_ethdev.h | 32
> > >>>>>>>>>>> +++++++++++++++----------
> > >>>>>>>>>>> lib/ethdev/version.map | 1 +
> > >>>>>>>>>>> 5 files changed, 46 insertions(+), 25 deletions(-)
> > >>>>>>>>>>>
> > >>>>>>>>>>> diff --git a/doc/guides/prog_guide/poll_mode_drv.rst
> > >>>>>>>>>>> b/doc/guides/prog_guide/poll_mode_drv.rst
> > >>>>>>>>>>> index c145a9066c..e380ff135a 100644
> > >>>>>>>>>>> --- a/doc/guides/prog_guide/poll_mode_drv.rst
> > >>>>>>>>>>> +++ b/doc/guides/prog_guide/poll_mode_drv.rst
> > >>>>>>>>>>> @@ -638,14 +638,9 @@ different from the application invokes=
recovery
> > >>>>>>>>>>> in PASSIVE mode,
> > >>>>>>>>>>> the PMD automatically recovers from error in PROACTIVE mo=
de,
> > >>>>>>>>>>> and only a small amount of work is required for the appli=
cation.
> > >>>>>>>>>>>
> > >>>>>>>>>>> -During error detection and automatic recovery,
> > >>>>>>>>>>> -the PMD sets the data path pointers to dummy functions
> > >>>>>>>>>>> -(which will prevent the crash),
> > >>>>>>>>>>> -and also make sure the control path operations fail with a=
return
> > >>>>>>>>>>> code ``-EBUSY``.
> > >>>>>>>>>>> -
> > >>>>>>>>>>> -Because the PMD recovers automatically,
> > >>>>>>>>>>> -the application can only sense that the data flow is disco=
nnected
> > >>>>>>>>>>> for a while
> > >>>>>>>>>>> -and the control API returns an error in this period.
> > >>>>>>>>>>> +During error detection and automatic recovery, the PMD set=
s the
> > >>>>>>>>>>> data path
> > >>>>>>>>>>> +pointers to dummy functions and also make sure the control=
path
> > >>>>>>>>>>> operations
> > >>>>>>>>>>> +failed with a return code ``-EBUSY``.
> > >>>>>>>>>>>
> > >>>>>>>>>>> In order to sense the error happening/recovering,
> > >>>>>>>>>>> as well as to restore some additional configuration,
> > >>>>>>>>>>> @@ -653,9 +648,9 @@ three events are available:
> > >>>>>>>>>>>
> > >>>>>>>>>>> ``RTE_ETH_EVENT_ERR_RECOVERING``
> > >>>>>>>>>>> Notify the application that an error is detected
> > >>>>>>>>>>> - and the recovery is being started.
> > >>>>>>>>>>> + and the recovery is about to start.
> > >>>>>>>>>>> Upon receiving the event, the application should not i=
nvoke
> > >>>>>>>>>>> - any control path function until receiving
> > >>>>>>>>>>> + any control and data path API until receiving
> > >>>>>>>>>>> ``RTE_ETH_EVENT_RECOVERY_SUCCESS`` or
> > >>>>>>>>>>> ``RTE_ETH_EVENT_RECOVERY_FAILED`` event.
> > >>>>>>>>>>>
> > >>>>>>>>>>> .. note::
> > >>>>>>>>>>> @@ -666,8 +661,9 @@ three events are available:
> > >>>>>>>>>>>
> > >>>>>>>>>>> ``RTE_ETH_EVENT_RECOVERY_SUCCESS``
> > >>>>>>>>>>> Notify the application that the recovery from error is=
successful,
> > >>>>>>>>>>> - the PMD already re-configures the port,
> > >>>>>>>>>>> - and the effect is the same as a restart operation.
> > >>>>>>>>>>> + the PMD already re-configures the port.
> > >>>>>>>>>>> + The application should restore some additional configur=
ation,
> > >>>>>>>>>>> and then
> > >>>>>>>>>>> + enable data path API invocation.
> > >>>>>>>>>>>
> > >>>>>>>>>>> ``RTE_ETH_EVENT_RECOVERY_FAILED``
> > >>>>>>>>>>> Notify the application that the recovery from error fa=
iled,
> > >>>>>>>>>>> diff --git a/lib/ethdev/ethdev_driver.c b/lib/ethdev/ethdev=
_driver.c
> > >>>>>>>>>>> index 0be1e8ca04..f994653fe9 100644
> > >>>>>>>>>>> --- a/lib/ethdev/ethdev_driver.c
> > >>>>>>>>>>> +++ b/lib/ethdev/ethdev_driver.c
> > >>>>>>>>>>> @@ -515,6 +515,14 @@ rte_eth_dma_zone_free(const struct rte=
_eth_dev
> > >>>>>>>>>>> *dev, const char *ring_name,
> > >>>>>>>>>>> return rc;
> > >>>>>>>>>>> }
> > >>>>>>>>>>>
> > >>>>>>>>>>> +void
> > >>>>>>>>>>> +rte_eth_fp_ops_setup(struct rte_eth_dev *dev)
> > >>>>>>>>>>> +{
> > >>>>>>>>>>> + if (dev =3D=3D NULL)
> > >>>>>>>>>>> + return;
> > >>>>>>>>>>> + eth_dev_fp_ops_setup(rte_eth_fp_ops + dev->data->port_=
id, dev);
> > >>>>>>>>>>> +}
> > >>>>>>>>>>> +
> > >>>>>>>>>>> const struct rte_memzone *
> > >>>>>>>>>>> rte_eth_dma_zone_reserve(const struct rte_eth_dev *dev, c=
onst char
> > >>>>>>>>>>> *ring_name,
> > >>>>>>>>>>> uint16_t queue_id, size_t size, unsigned int=
align,
> > >>>>>>>>>>> diff --git a/lib/ethdev/ethdev_driver.h b/lib/ethdev/ethdev=
_driver.h
> > >>>>>>>>>>> index 2c9d615fb5..0d964d1f67 100644
> > >>>>>>>>>>> --- a/lib/ethdev/ethdev_driver.h
> > >>>>>>>>>>> +++ b/lib/ethdev/ethdev_driver.h
> > >>>>>>>>>>> @@ -1621,6 +1621,16 @@ int
> > >>>>>>>>>>> rte_eth_dma_zone_free(const struct rte_eth_dev *eth_dev, =
const
> > >>>>>>>>>>> char *name,
> > >>>>>>>>>>> uint16_t queue_id);
> > >>>>>>>>>>>
> > >>>>>>>>>>> +/**
> > >>>>>>>>>>> + * @internal
> > >>>>>>>>>>> + * Setup eth fast-path API to ethdev values.
> > >>>>>>>>>>> + *
> > >>>>>>>>>>> + * @param dev
> > >>>>>>>>>>> + * Pointer to struct rte_eth_dev.
> > >>>>>>>>>>> + */
> > >>>>>>>>>>> +__rte_internal
> > >>>>>>>>>>> +void rte_eth_fp_ops_setup(struct rte_eth_dev *dev);
> > >>>>>>>>>>> +
> > >>>>>>>>>>> /**
> > >>>>>>>>>>> * @internal
> > >>>>>>>>>>> * Atomically set the link status for the specific device=
.
> > >>>>>>>>>>> diff --git a/lib/ethdev/rte_ethdev.h b/lib/ethdev/rte_ethde=
v.h
> > >>>>>>>>>>> index 049641d57c..44ee7229c1 100644
> > >>>>>>>>>>> --- a/lib/ethdev/rte_ethdev.h
> > >>>>>>>>>>> +++ b/lib/ethdev/rte_ethdev.h
> > >>>>>>>>>>> @@ -3944,25 +3944,28 @@ enum rte_eth_event_type {
> > >>>>>>>>>>> */
> > >>>>>>>>>>> RTE_ETH_EVENT_RX_AVAIL_THRESH,
> > >>>>>>>>>>> /** Port recovering from a hardware or firmware error=
.
> > >>>>>>>>>>> - * If PMD supports proactive error recovery,
> > >>>>>>>>>>> - * it should trigger this event to notify application
> > >>>>>>>>>>> - * that it detected an error and the recovery is being=
started.
> > >>>>>>>>>>> - * Upon receiving the event, the application should no=
t invoke
> > >>>>>>>>>>> any control path API
> > >>>>>>>>>>> - * (such as rte_eth_dev_configure/rte_eth_dev_stop...)=
until
> > >>>>>>>>>>> receiving
> > >>>>>>>>>>> - * RTE_ETH_EVENT_RECOVERY_SUCCESS or
> > >>>>>>>>>>> RTE_ETH_EVENT_RECOVERY_FAILED event.
> > >>>>>>>>>>> - * The PMD will set the data path pointers to dummy fu=
nctions,
> > >>>>>>>>>>> - * and re-set the data path pointers to non-dummy func=
tions
> > >>>>>>>>>>> - * before reporting RTE_ETH_EVENT_RECOVERY_SUCCESS eve=
nt.
> > >>>>>>>>>>> - * It means that the application cannot send or receiv=
e any
> > >>>>>>>>>>> packets
> > >>>>>>>>>>> - * during this period.
> > >>>>>>>>>>> + *
> > >>>>>>>>>>> + * If PMD supports proactive error recovery, it should=
trigger
> > >>>>>>>>>>> this
> > >>>>>>>>>>> + * event to notify application that it detected an err=
or and the
> > >>>>>>>>>>> + * recovery is about to start.
> > >>>>>>>>>>> + *
> > >>>>>>>>>>> + * Upon receiving the event, the application should no=
t invoke any
> > >>>>>>>>>>> + * control and data path API until receiving
> > >>>>>>>>>>> + * RTE_ETH_EVENT_RECOVERY_SUCCESS or RTE_ETH_EVENT_REC=
OVERY_FAILED
> > >>>>>>>>>>> + * event.
> > >>>>>>>>>>> + *
> > >>>>>>>>>>> + * Once this event is reported, the PMD will set the d=
ata path
> > >>>>>>>>>>> pointers
> > >>>>>>>>>>> + * to dummy functions, and re-set the data path pointe=
rs to valid
> > >>>>>>>>>>> + * functions before reporting RTE_ETH_EVENT_RECOVERY_S=
UCCESS
> > >>>>>>>>>>> event.
> > >>>>>>>>>>> + *
> > >>>>>>>>>>> * @note Before the PMD reports the recovery result,
> > >>>>>>>>>>> * the PMD may report the RTE_ETH_EVENT_ERR_RECOVERIN=
G event
> > >>>>>>>>>>> again,
> > >>>>>>>>>>> * because a larger error may occur during the recove=
ry.
> > >>>>>>>>>>> */
> > >>>>>>>>>>> RTE_ETH_EVENT_ERR_RECOVERING,
> > >>>>>>>>>>> /** Port recovers successfully from the error.
> > >>>>>>>>>>> - * The PMD already re-configured the port,
> > >>>>>>>>>>> - * and the effect is the same as a restart operation.
> > >>>>>>>>>>> + *
> > >>>>>>>>>>> + * The PMD already re-configured the port:
> > >>>>>>>>>>> * a) The following operation will be retained: (alph=
abetically)
> > >>>>>>>>>>> * - DCB configuration
> > >>>>>>>>>>> * - FEC configuration
> > >>>>>>>>>>> @@ -3989,6 +3992,9 @@ enum rte_eth_event_type {
> > >>>>>>>>>>> * (@see RTE_ETH_DEV_CAPA_FLOW_SHARED_OBJECT_KEE=
P)
> > >>>>>>>>>>> * c) Any other configuration will not be stored
> > >>>>>>>>>>> * and will need to be re-configured.
> > >>>>>>>>>>> + *
> > >>>>>>>>>>> + * The application should restore some additional conf=
iguration
> > >>>>>>>>>>> + * (see above case b/c), and then enable data path API=
invocation.
> > >>>>>>>>>>> */
> > >>>>>>>>>>> RTE_ETH_EVENT_RECOVERY_SUCCESS,
> > >>>>>>>>>>> /** Port recovery failed.
> > >>>>>>>>>>> diff --git a/lib/ethdev/version.map b/lib/ethdev/version.ma=
p
> > >>>>>>>>>>> index 357d1a88c0..c273e0bdae 100644
> > >>>>>>>>>>> --- a/lib/ethdev/version.map
> > >>>>>>>>>>> +++ b/lib/ethdev/version.map
> > >>>>>>>>>>> @@ -320,6 +320,7 @@ INTERNAL {
> > >>>>>>>>>>> rte_eth_devices;
> > >>>>>>>>>>> rte_eth_dma_zone_free;
> > >>>>>>>>>>> rte_eth_dma_zone_reserve;
> > >>>>>>>>>>> + rte_eth_fp_ops_setup;
> > >>>>>>>>>>> rte_eth_hairpin_queue_peer_bind;
> > >>>>>>>>>>> rte_eth_hairpin_queue_peer_unbind;
> > >>>>>>>>>>> rte_eth_hairpin_queue_peer_update;
> > >>>>>>>>>>> --
> > >>>>>>>>>> Acked-by: Konstantin Ananyev <konstantin.ananyev@huawei.co=
m>
> > >>>>>>>>>>
> > >>>>>>>>>>> 2.17.1
> > >>>>>>>>>>
> > >>>>>>>>>
> > >>>>>>>>
> > >>>>>>
> > >>>>>
> > >
> > > .
> > >
--000000000000fec2dd05f66e134f
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