DPDK patches and discussions
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From: fengchengwen <fengchengwen@huawei.com>
To: Ray Kinsella <mdr@ashroe.eu>, Thomas Monjalon <thomas@monjalon.net>
Cc: Ferruh Yigit <ferruh.yigit@intel.com>,
	Kalesh A P <kalesh-anakkur.purayil@broadcom.com>, <dev@dpdk.org>,
	<ajit.khaparde@broadcom.com>, <asafp@nvidia.com>,
	David Marchand <david.marchand@redhat.com>,
	Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>,
	<lizhenyi1@huawei.com>, shuliubin 00419723 <shuliubin@huawei.com>
Subject: Re: [dpdk-dev] [PATCH v7 1/4] ethdev: support device reset and recovery events
Date: Sat, 21 May 2022 18:33:48 +0800	[thread overview]
Message-ID: <c27dbe0a-b5be-a246-eae4-960f06d583e4@huawei.com> (raw)
In-Reply-To: <875yphigb6.fsf@mdr78.vserver.site>

Hi all,

  This patch lasts for a long time. Are we waiting for 22.11 to deal with it?

  We have the same requirements for the reset or recovery mechanism, but there are differences:

    APP                                    PMD
     |                                      |
     |                                  detect error
     |     <---report error event---        |
     |                                      |
do error stats                              |
and report                                  |
     |      ---start recover-->             |
     |                                  do recover
     |     <---report recover result        |
     |                                      |
if succ just log
else may migrate
service

Can we generalize these processes(means that the implementation is at the framework layer)? or only at PMD API?


On 2022/2/15 0:06, Ray Kinsella wrote:
> 
> Thomas Monjalon <thomas@monjalon.net> writes:
> 
>> 14/02/2022 11:16, Ray Kinsella:
>>> Ray Kinsella <mdr@ashroe.eu> writes:
>>>> Thomas Monjalon <thomas@monjalon.net> writes:
>>>>> 02/02/2022 12:44, Ray Kinsella:
>>>>>> Ferruh Yigit <ferruh.yigit@intel.com> writes:
>>>>>>> On 1/28/2022 12:48 PM, Kalesh A P wrote:
>>>>>>>> --- a/lib/ethdev/rte_ethdev.h
>>>>>>>> +++ b/lib/ethdev/rte_ethdev.h
>>>>>>>> @@ -3818,6 +3818,24 @@ enum rte_eth_event_type {
>>>>>>>>   	RTE_ETH_EVENT_DESTROY,  /**< port is released */
>>>>>>>>   	RTE_ETH_EVENT_IPSEC,    /**< IPsec offload related event */
>>>>>>>>   	RTE_ETH_EVENT_FLOW_AGED,/**< New aged-out flows is detected */
>>>>>>>> +	RTE_ETH_EVENT_ERR_RECOVERING,
>>>>>>>> +			/**< port recovering from an error
>>>>>>>> +			 *
>>>>>>>> +			 * PMD detected a FW reset or error condition.
>>>>>>>> +			 * PMD will try to recover from the error.
>>>>>>>> +			 * Data path may be quiesced and Control path operations
>>>>>>>> +			 * may fail at this time.
>>>>>>>> +			 */
>>>>>>>> +	RTE_ETH_EVENT_RECOVERED,
>>>>>>>> +			/**< port recovered from an error
>>>>>>>> +			 *
>>>>>>>> +			 * PMD has recovered from the error condition.
>>>>>>>> +			 * Control path and Data path are up now.
>>>>>>>> +			 * PMD re-configures the port to the state prior to the error.
>>>>>>>> +			 * Since the device has undergone a reset, flow rules
>>>>>>>> +			 * offloaded prior to reset may be lost and
>>>>>>>> +			 * the application should recreate the rules again.
>>>>>>>> +			 */
>>>>>>>>   	RTE_ETH_EVENT_MAX       /**< max value of this enum */
>>>>>>>
>>>>>>>
>>>>>>> Also ABI check complains about 'RTE_ETH_EVENT_MAX' value check, cc'ed more people
>>>>>>> to evaluate if it is a false positive:
>>>>>>>
>>>>>>>
>>>>>>> 1 function with some indirect sub-type change:
>>>>>>>   [C] 'function int rte_eth_dev_callback_register(uint16_t, rte_eth_event_type, rte_eth_dev_cb_fn, void*)' at rte_ethdev.c:4637:1 has some indirect sub-type changes:
>>>>>>>     parameter 3 of type 'typedef rte_eth_dev_cb_fn' has sub-type changes:
>>>>>>>       underlying type 'int (typedef uint16_t, enum rte_eth_event_type, void*, void*)*' changed:
>>>>>>>         in pointed to type 'function type int (typedef uint16_t, enum rte_eth_event_type, void*, void*)':
>>>>>>>           parameter 2 of type 'enum rte_eth_event_type' has sub-type changes:
>>>>>>>             type size hasn't changed
>>>>>>>             2 enumerator insertions:
>>>>>>>               'rte_eth_event_type::RTE_ETH_EVENT_ERR_RECOVERING' value '11'
>>>>>>>               'rte_eth_event_type::RTE_ETH_EVENT_RECOVERED' value '12'
>>>>>>>             1 enumerator change:
>>>>>>>               'rte_eth_event_type::RTE_ETH_EVENT_MAX' from value '11' to '13' at rte_ethdev.h:3807:1
>>>>>>
>>>>>> I don't immediately see the problem that this would cause.
>>>>>> There are no array sizes etc dependent on the value of MAX for instance.
>>>>>>
>>>>>> Looks safe?
>>>>>
>>>>> We never know how this enum will be used by the application.
>>>>> The max value may be used for the size of an event array.
>>>>> It looks a real ABI issue unfortunately.
>>>>
>>>> Right - but we only really care about it when an array size based on MAX
>>>> is likely to be passed to DPDK, which doesn't apply in this case.
>>
>> I don't completely agree.
>> A developer may assume an event will never exceed MAX value.
>> However, after an upgrade of DPDK without app rebuild,
>> a higher event value may be received in the app,
>> breaking the assumption.
>> Should we consider this case as an ABI breakage?
> 
> Nope - I think we should explicitly exclude MAX values from any
> ABI guarantee, as being able to change them is key to our be able to
> evolve DPDK while maintaining ABI stability. 
> 
> Consider what it means applying the ABI policy to a MAX value, you are
> in effect saying that that no value can be added to this enumeration
> until the next ABI version, for me this is very restrictive without a
> solid reason. 
> 
>>
>>>> I noted that some Linux folks explicitly mark similar MAX values as not
>>>> part of the ABI.
>>>>
>>>> /usr/include/linux/perf_event.h
>>>> 37:     PERF_TYPE_MAX,                          /* non-ABI */
>>>> 60:     PERF_COUNT_HW_MAX,                      /* non-ABI */
>>>> 79:     PERF_COUNT_HW_CACHE_MAX,                /* non-ABI */
>>>> 87:     PERF_COUNT_HW_CACHE_OP_MAX,             /* non-ABI */
>>>> 94:     PERF_COUNT_HW_CACHE_RESULT_MAX,         /* non-ABI */
>>>> 116:    PERF_COUNT_SW_MAX,                      /* non-ABI */
>>>> 149:    PERF_SAMPLE_MAX = 1U << 24,             /* non-ABI */
>>>> 151:    __PERF_SAMPLE_CALLCHAIN_EARLY           = 1ULL << 63, /*
>>>> non-ABI; internal use */
>>>> 189:    PERF_SAMPLE_BRANCH_MAX_SHIFT            /* non-ABI */
>>>> 267:    PERF_TXN_MAX            = (1 << 8), /* non-ABI */
>>>> 301:    PERF_FORMAT_MAX = 1U << 4,              /* non-ABI */
>>>> 1067:   PERF_RECORD_MAX,                        /* non-ABI */
>>>> 1078:   PERF_RECORD_KSYMBOL_TYPE_MAX            /* non-ABI */
>>>> 1087:   PERF_BPF_EVENT_MAX,             /* non-ABI */
>>>
>>> Any thoughts on similarly annotating all our _MAX enums in the same way?
>>> We could also add a section in the ABI Policy to make it explicit _MAX
>>> enum values are not part of the ABI - what do folks think?
>>
>> Interesting. I am not sure it is always ABI-safe though.
> 
> 


  parent reply	other threads:[~2022-05-21 10:33 UTC|newest]

Thread overview: 84+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-22 10:16 [dpdk-dev] [RFC PATCH 0/3] librte_ethdev: error recovery support Kalesh A P
2020-01-22 10:16 ` [dpdk-dev] [RFC PATCH 1/3] librte_ethdev: support device recovery event Kalesh A P
2020-03-11 13:20   ` Thomas Monjalon
2020-03-12  3:31     ` Kalesh Anakkur Purayil
2020-03-12  7:29       ` Thomas Monjalon
2020-01-22 10:16 ` [dpdk-dev] [RFC PATCH 2/3] net/bnxt: notify applications about device reset Kalesh A P
2020-01-22 10:16 ` [dpdk-dev] [RFC PATCH 3/3] app/testpmd: handle device recovery event Kalesh A P
2020-03-11 13:19 ` [dpdk-dev] [RFC PATCH 0/3] librte_ethdev: error recovery support Thomas Monjalon
2020-03-12  3:25   ` Kalesh Anakkur Purayil
2020-03-12  7:34     ` Thomas Monjalon
2020-07-03 16:12       ` Ferruh Yigit
2020-09-30  7:03 ` [dpdk-dev] [RFC V2 " Kalesh A P
2020-09-30  7:03   ` [dpdk-dev] [RFC V2 1/3] ethdev: support device reset and recovery events Kalesh A P
2020-09-30  7:03   ` [dpdk-dev] [RFC V2 2/3] net/bnxt: notify applications about device reset/recovery Kalesh A P
2020-09-30  7:03   ` [dpdk-dev] [RFC V2 3/3] app/testpmd: handle device recovery event Kalesh A P
2020-09-30  7:07 ` [dpdk-dev] [RFC PATCH v2 0/3] librte_ethdev: error recovery support Kalesh A P
2020-09-30  7:07   ` [dpdk-dev] [RFC PATCH v2 1/3] ethdev: support device reset and recovery events Kalesh A P
2020-09-30  7:07   ` [dpdk-dev] [RFC PATCH v2 2/3] net/bnxt: notify applications about device reset/recovery Kalesh A P
2020-09-30  7:07   ` [dpdk-dev] [RFC PATCH v2 3/3] app/testpmd: handle device recovery event Kalesh A P
2020-09-30  7:12 ` [dpdk-dev] [RFC PATCH v3 0/3] librte_ethdev: error recovery support Kalesh A P
2020-09-30  7:12   ` [dpdk-dev] [RFC PATCH v3 1/3] ethdev: support device reset and recovery events Kalesh A P
2020-09-30  7:50     ` Thomas Monjalon
2020-09-30  8:35       ` Kalesh Anakkur Purayil
2020-09-30  9:31         ` Thomas Monjalon
2020-09-30  7:12   ` [dpdk-dev] [RFC PATCH v3 2/3] net/bnxt: notify applications about device reset/recovery Kalesh A P
2020-09-30  7:12   ` [dpdk-dev] [RFC PATCH v3 3/3] app/testpmd: handle device recovery event Kalesh A P
2020-10-08 10:53     ` Asaf Penso
2020-09-30 12:33 ` [dpdk-dev] [RFC PATCH v4 0/3] librte_ethdev: error recovery support Kalesh A P
2020-09-30 12:33   ` [dpdk-dev] [RFC PATCH v4 1/3] ethdev: support device reset and recovery events Kalesh A P
2020-09-30 12:33   ` [dpdk-dev] [RFC PATCH v4 2/3] net/bnxt: notify applications about device reset/recovery Kalesh A P
2020-09-30 12:33   ` [dpdk-dev] [RFC PATCH v4 3/3] app/testpmd: handle device recovery event Kalesh A P
2020-10-06 17:25     ` Ophir Munk
2020-10-07  4:46       ` Kalesh Anakkur Purayil
2020-10-07  8:36         ` Ophir Munk
2020-10-07  9:37         ` Ferruh Yigit
2020-10-07 18:42           ` Ajit Khaparde
2020-10-07 16:49 ` [dpdk-dev] [PATCH v5 0/3] librte_ethdev: error recovery support Kalesh A P
2020-10-07 16:49   ` [dpdk-dev] [PATCH v5 1/3] ethdev: support device reset and recovery events Kalesh A P
2020-10-08 10:49     ` Asaf Penso
2020-10-07 16:49   ` [dpdk-dev] [PATCH v5 2/3] net/bnxt: notify applications about device reset/recovery Kalesh A P
2020-10-07 16:49   ` [dpdk-dev] [PATCH v5 3/3] app/testpmd: handle device recovery event Kalesh A P
2020-10-09  3:48 ` [dpdk-dev] [PATCH v6 0/3] librte_ethdev: error recovery support Kalesh A P
2020-10-09  3:48   ` [dpdk-dev] [PATCH v6 1/3] ethdev: support device reset and recovery events Kalesh A P
2020-10-11 21:29     ` Thomas Monjalon
2020-10-12  8:09       ` Andrew Rybchenko
2021-02-18 15:32         ` Ferruh Yigit
2020-10-09  3:48   ` [dpdk-dev] [PATCH v6 2/3] net/bnxt: notify applications about device reset/recovery Kalesh A P
2020-10-09  3:48   ` [dpdk-dev] [PATCH v6 3/3] app/testpmd: handle device recovery event Kalesh A P
2022-01-28 12:48   ` [dpdk-dev] [PATCH v7 0/4] ethdev: error recovery support Kalesh A P
2022-01-28 12:48     ` [dpdk-dev] [PATCH v7 1/4] ethdev: support device reset and recovery events Kalesh A P
2022-02-01 12:11       ` Ferruh Yigit
2022-02-01 13:09         ` Kalesh Anakkur Purayil
2022-02-01 13:19           ` Ferruh Yigit
2022-02-03 20:28             ` Ajit Khaparde
2022-02-10 22:42               ` Thomas Monjalon
2022-02-01 12:52       ` Ferruh Yigit
2022-02-02 11:44         ` Ray Kinsella
2022-02-10 22:16           ` Thomas Monjalon
2022-02-11 10:09             ` Ray Kinsella
2022-02-14 10:16               ` Ray Kinsella
2022-02-14 11:15                 ` Thomas Monjalon
2022-02-14 16:06                   ` Ray Kinsella
2022-02-14 16:25                     ` Thomas Monjalon
2022-02-14 18:27                       ` Ray Kinsella
2022-02-15 13:55                         ` Ray Kinsella
2022-02-15 15:12                           ` Thomas Monjalon
2022-02-15 16:12                             ` Ray Kinsella
2022-05-21 10:33                     ` fengchengwen [this message]
2022-05-24 15:11                       ` Ray Kinsella
2022-06-10  0:16                         ` fengchengwen
2022-01-28 12:48     ` [dpdk-dev] [PATCH v7 2/4] app/testpmd: handle device recovery event Kalesh A P
2022-01-28 12:48     ` [dpdk-dev] [PATCH v7 3/4] net/bnxt: notify applications about device reset/recovery Kalesh A P
2022-01-28 12:48     ` [dpdk-dev] [PATCH v7 4/4] doc: update release notes Kalesh A P
2022-02-01 12:12       ` Ferruh Yigit
2022-06-16  9:41     ` [PATCH v8 0/4] ethdev: support error recovery notification Chengwen Feng
2022-06-16  9:41       ` [PATCH v8 1/4] ethdev: support device " Chengwen Feng
2022-06-20 17:42         ` Thomas Monjalon
2022-06-21  1:38           ` fengchengwen
2022-06-21  7:04             ` Thomas Monjalon
2022-09-22  7:53               ` fengchengwen
2022-06-23 15:58         ` Ray Kinsella
2022-06-16  9:41       ` [PATCH v8 2/4] app/testpmd: handle error recovery notification event Chengwen Feng
2022-06-16  9:41       ` [PATCH v8 3/4] net/hns3: support " Chengwen Feng
2022-06-16  9:41       ` [PATCH v8 4/4] net/bnxt: notify applications about device reset/recovery Chengwen Feng

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