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From: Ferruh Yigit <ferruh.yigit@intel.com>
To: "Kinsella, Ray" <ray.kinsella@intel.com>,
	Thomas Monjalon <thomas@monjalon.net>,
	"Guo, Jia" <jia.guo@intel.com>,
	"Zhang, Qi Z" <qi.z.zhang@intel.com>
Cc: "Wu, Jingjing" <jingjing.wu@intel.com>,
	"Yang, Qiming" <qiming.yang@intel.com>,
	"Wang, Haiyue" <haiyue.wang@intel.com>,
	"dev@dpdk.org" <dev@dpdk.org>,
	"andrew.rybchenko@oktetlabs.ru" <andrew.rybchenko@oktetlabs.ru>,
	"orika@nvidia.com" <orika@nvidia.com>,
	"getelson@nvidia.com" <getelson@nvidia.com>,
	Dodji Seketeli <dodji@redhat.com>
Subject: Re: [dpdk-dev] [dpdk-dev v2 1/2] ethdev: add new tunnel type for ecpri
Date: Fri, 8 Jan 2021 14:27:23 +0000
Message-ID: <5c90d107-8569-1c32-fa16-35068b983365@intel.com> (raw)
In-Reply-To: <PH0PR11MB4776551DEB97A5970962116D90AE0@PH0PR11MB4776.namprd11.prod.outlook.com>

On 1/8/2021 12:38 PM, Kinsella, Ray wrote:
> 
> 
>> -----Original Message-----
>> From: Thomas Monjalon <thomas@monjalon.net>
>> Sent: Friday 8 January 2021 10:24
>> To: Guo, Jia <jia.guo@intel.com>; Zhang, Qi Z <qi.z.zhang@intel.com>;
>> Yigit, Ferruh <ferruh.yigit@intel.com>
>> Cc: Wu, Jingjing <jingjing.wu@intel.com>; Yang, Qiming
>> <qiming.yang@intel.com>; Wang, Haiyue <haiyue.wang@intel.com>;
>> dev@dpdk.org; andrew.rybchenko@oktetlabs.ru; orika@nvidia.com;
>> getelson@nvidia.com; Dodji Seketeli <dodji@redhat.com>; Kinsella, Ray
>> <ray.kinsella@intel.com>
>> Subject: Re: [dpdk-dev] [dpdk-dev v2 1/2] ethdev: add new tunnel type
>> for ecpri
>>
>> 08/01/2021 10:22, Ferruh Yigit:
>>> On 1/7/2021 1:33 PM, Thomas Monjalon wrote:
>>>> 07/01/2021 13:47, Zhang, Qi Z:
>>>>> From: Thomas Monjalon <thomas@monjalon.net>
>>>>>> 07/01/2021 10:32, Guo, Jia:
>>>>>>> From: Thomas Monjalon <thomas@monjalon.net>
>>>>>>>> Sorry, it is a nack.
>>>>>>>> BTW, it is probably breaking the ABI because of
>> RTE_TUNNEL_TYPE_MAX.
>>>>>
>>>>> Yes that may break the ABI but fortunately the checking-abi-
>> compatibility tool shows negative :) , thanks Ferruh' s guide.
>>>>> https://github.com/ferruhy/dpdk/actions/runs/468859673
>>>>
>>>> That's very strange. An enum value is changed.
>>>> Why it is not flagged by libabigail?
>>>
>>> As long as the enum values not sent to the application and kept
>> within
>>> the library, changing their values shouldn't be problem.
>>
>> But RTE_TUNNEL_TYPE_MAX is part of lib/librte_ethdev/rte_ethdev.h so it
>> is exposed to the application.
>> I think it is a case of ABI breakage.
>>
> 
> Really a lot depends on context, Thomas is right it is hard to predict how these _MAX values are used.
> 
> We have seen cases in the past where _MAX enumeration values have been used to size arrays the like - I don't immediately see that issue here. My understanding is that the only consumer of this enumeration is rte_eth_dev_udp_tunnel_port_add and rte_eth_dev_udp_tunnel_port_delete, right? On face value, impact looks negligible.
> 
> I will take a look at why libabigail doesn't complain.
> 

Application can use the enum, including MAX as they desire, we can't really 
assume anything there.

In previous case, library was providing an enum value back to application. And 
the problem was application can use those values blindly and new unexpected 
values may cause trouble.

For this case, even the application create a table with RTE_TUNNEL_TYPE_MAX 
size, library is not sending any type of this enum to application to cause any 
problem, at least abigail seems not able to finding any instance of it.

  reply	other threads:[~2021-01-08 14:27 UTC|newest]

Thread overview: 91+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-16  8:58 [dpdk-dev] [dpdk-dev 21.02 0/5] enable UDP ecpri configure in dcf Jeff Guo
2020-12-16  8:58 ` [dpdk-dev] [dpdk-dev 21.02 1/5] ethdev: add new tunnel type for ecpri Jeff Guo
2020-12-23  9:28   ` Zhang, Qi Z
2020-12-16  8:58 ` [dpdk-dev] [dpdk-dev 21.02 2/5] net/ice/base: add new UDP " Jeff Guo
2020-12-16  8:58 ` [dpdk-dev] [dpdk-dev 21.02 3/5] net/ice: add ecpri package type Jeff Guo
2020-12-16  8:58 ` [dpdk-dev] [dpdk-dev 21.02 4/5] net/ice: enable ecpri tunnel port configure in dcf Jeff Guo
2020-12-16  8:58 ` [dpdk-dev] [dpdk-dev 21.02 5/5] app/testpmd: add new UDP tunnel port for ecpri Jeff Guo
2020-12-24  6:59 ` [dpdk-dev] [dpdk-dev v2 0/2] " Jeff Guo
2020-12-24  6:59   ` [dpdk-dev] [dpdk-dev v2 1/2] ethdev: add new tunnel type " Jeff Guo
2021-01-06 22:12     ` Thomas Monjalon
2021-01-07  9:32       ` Guo, Jia
2021-01-07 10:09         ` Andrew Rybchenko
2021-01-07 10:11         ` Thomas Monjalon
2021-01-07 12:47           ` Zhang, Qi Z
2021-01-07 13:33             ` Thomas Monjalon
2021-01-07 13:45               ` David Marchand
2021-01-07 14:27                 ` Dodji Seketeli
2021-01-07 15:24               ` Zhang, Qi Z
2021-01-07 16:58                 ` Thomas Monjalon
2021-01-08  1:41                   ` Zhang, Qi Z
2021-01-08  8:57                     ` Ferruh Yigit
2021-01-08  9:29                       ` Andrew Rybchenko
2021-01-08 10:36                         ` Thomas Monjalon
2021-01-09  1:01                           ` Zhang, Qi Z
2021-01-10 10:46                             ` Ori Kam
2021-01-11  9:23                               ` Thomas Monjalon
2021-01-11 11:26                                 ` Zhang, Qi Z
2021-01-11 11:37                                   ` Thomas Monjalon
2021-01-11 14:02                                     ` Zhang, Qi Z
2021-01-11 14:53                                       ` Thomas Monjalon
2021-01-12  2:14                                         ` Zhang, Qi Z
2021-01-15 15:15                                           ` Thomas Monjalon
2021-01-08  9:22               ` Ferruh Yigit
2021-01-08 10:23                 ` Thomas Monjalon
2021-01-08 10:43                   ` Ferruh Yigit
2021-01-08 14:06                     ` Thomas Monjalon
2021-01-08 14:07                       ` Kinsella, Ray
2021-01-08 14:10                         ` Thomas Monjalon
2021-01-08 12:38                   ` Kinsella, Ray
2021-01-08 14:27                     ` Ferruh Yigit [this message]
2021-01-08 14:31                       ` Kinsella, Ray
2021-01-08 17:34                       ` Kinsella, Ray
2021-01-14 14:34     ` Ferruh Yigit
2021-01-15  2:51       ` Guo, Jia
2020-12-24  6:59   ` [dpdk-dev] [dpdk-dev v2 2/2] app/testpmd: add new UDP tunnel port " Jeff Guo
2021-01-14 14:33     ` Ferruh Yigit
2021-01-15  2:13       ` Guo, Jia
2020-12-24 13:40   ` [dpdk-dev] [dpdk-dev v2 0/2] " Zhang, Qi Z
2020-12-24  7:01 ` [dpdk-dev] [dpdk-dev v2 0/6] enable UDP ecpri configure in dcf Jeff Guo
2020-12-24  7:01   ` [dpdk-dev] [dpdk-dev v2 1/6] net/ice/base: add package PTYPE enable information Jeff Guo
2020-12-24  7:01   ` [dpdk-dev] [dpdk-dev v2 2/6] net/ice: refactor package type parsing Jeff Guo
2020-12-24  7:01   ` [dpdk-dev] [dpdk-dev v2 3/6] net/ice/base: add new UDP tunnel type for ecpri Jeff Guo
2020-12-24  7:01   ` [dpdk-dev] [dpdk-dev v2 4/6] net/ice: add PTYPE mapping " Jeff Guo
2020-12-24  7:01   ` [dpdk-dev] [dpdk-dev v2 5/6] net/iavf: " Jeff Guo
2020-12-24  7:01   ` [dpdk-dev] [dpdk-dev v2 6/6] net/ice: enable ecpri tunnel port configure in dcf Jeff Guo
2021-01-12  9:32 ` [dpdk-dev] [dpdk-dev v3 0/3] net/ice: refactor PTYPE parsing Jeff Guo
2021-01-12  9:32   ` [dpdk-dev] [dpdk-dev v3 1/3] net/ice/base: add package PTYPE enable information Jeff Guo
2021-01-12  9:32   ` [dpdk-dev] [dpdk-dev v3 2/3] net/ice/base: add PTYPE value Jeff Guo
2021-01-12  9:32   ` [dpdk-dev] [dpdk-dev v3 3/3] net/ice: refactor PTYPE parsing Jeff Guo
2021-01-13  5:31 ` [dpdk-dev] [dpdk-dev v4 0/2] " Jeff Guo
2021-01-13  5:31   ` [dpdk-dev] [dpdk-dev v4 1/2] net/ice/base: add PTYPE value Jeff Guo
2021-01-13  5:31   ` [dpdk-dev] [dpdk-dev v4 2/2] net/ice: refactor PTYPE parsing Jeff Guo
2021-01-13  6:07   ` [dpdk-dev] [dpdk-dev v4 0/2] " Zhang, Qi Z
2021-01-13 14:05 ` [dpdk-dev] [dpdk-dev v3 0/3] enable UDP ecpri configure in dcf Jeff Guo
2021-01-13 14:05   ` [dpdk-dev] [dpdk-dev v3 1/3] net/ice: add PTYPE mapping for ecpri Jeff Guo
2021-01-13 14:05   ` [dpdk-dev] [dpdk-dev v3 2/3] net/iavf: " Jeff Guo
2021-01-13 14:05   ` [dpdk-dev] [dpdk-dev v3 3/3] net/ice: enable ecpri tunnel port configure in dcf Jeff Guo
2021-01-14  4:18   ` [dpdk-dev] [dpdk-dev v3 0/3] enable UDP ecpri " Zhang, Qi Z
2021-01-18  9:28     ` Ferruh Yigit
2021-01-15  2:42 ` [dpdk-dev] [dpdk-dev v3 0/2] add new UDP tunnel port for ecpri Jeff Guo
2021-01-15  2:42   ` [dpdk-dev] [dpdk-dev v3 1/2] ethdev: add new tunnel type " Jeff Guo
2021-01-15  2:42   ` [dpdk-dev] [dpdk-dev v3 2/2] app/testpmd: add new UDP tunnel port " Jeff Guo
2021-01-15  4:35 ` [dpdk-dev] [dpdk-dev v4 0/2] add new UDP tunnel port configure for eCPRI Jeff Guo
2021-01-15  4:35   ` [dpdk-dev] [dpdk-dev v4 1/2] ethdev: add new tunnel type " Jeff Guo
2021-01-15  4:35   ` [dpdk-dev] [dpdk-dev v4 2/2] app/testpmd: add new UDP tunnel port " Jeff Guo
2021-01-15  5:15 ` [dpdk-dev] [dpdk-dev v5 0/2] add new UDP tunnel port configure " Jeff Guo
2021-01-15  5:15   ` [dpdk-dev] [dpdk-dev v5 1/2] ethdev: add new tunnel type " Jeff Guo
2021-01-15 12:23     ` Ferruh Yigit
2021-01-18  2:40       ` Guo, Jia
2021-01-15  5:15   ` [dpdk-dev] [dpdk-dev v5 2/2] app/testpmd: add new UDP tunnel port " Jeff Guo
2021-01-15 12:24     ` Ferruh Yigit
2021-01-15 12:28   ` [dpdk-dev] [dpdk-dev v5 0/2] add new UDP tunnel port configure " Ferruh Yigit
2021-01-19  3:59 ` [dpdk-dev] [dpdk-dev v4] net/ice: enable eCPRI tunnel port configure in dcf Jeff Guo
2021-01-19  4:15 ` Jeff Guo
2021-01-19  4:19 ` [dpdk-dev] [dpdk-dev v5] " Jeff Guo
2021-01-20 10:14   ` Zhang, Qi Z
2021-01-20 10:19     ` Thomas Monjalon
2021-01-20 10:23       ` Zhang, Qi Z
2021-01-20 10:30         ` Thomas Monjalon
2021-01-20 10:36           ` Zhang, Qi Z
2021-01-20 10:39             ` Thomas Monjalon

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