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From: "Burakov, Anatoly" <anatoly.burakov@intel.com>
To: David Marchand <david.marchand@redhat.com>,
	Ferruh Yigit <ferruh.yigit@intel.com>
Cc: Thomas Monjalon <thomas@monjalon.net>,
	Ajit Khaparde <ajit.khaparde@broadcom.com>,
	Alejandro Lucero <alejandro.lucero@netronome.com>,
	Beilei Xing <beilei.xing@intel.com>,
	Bruce Richardson <bruce.richardson@intel.com>, dev <dev@dpdk.org>,
	Hyong Youb Kim <hyonkim@cisco.com>,
	Igor Russkikh <igor.russkikh@aquantia.com>,
	Jerin Jacob Kollanukkaran <jerinj@marvell.com>,
	Jingjing Wu <jingjing.wu@intel.com>,
	"Mcnamara, John" <john.mcnamara@intel.com>,
	John Daley <johndale@cisco.com>,
	Kiran Kumar Kokkilagadda <kirankumark@marvell.com>,
	"Ananyev, Konstantin" <konstantin.ananyev@intel.com>,
	"Kovacevic, Marko" <marko.kovacevic@intel.com>,
	Matan Azrad <matan@mellanox.com>,
	Nithin Dabilpuram <ndabilpuram@marvell.com>,
	Pavel Belous <pavel.belous@aquantia.com>,
	Qi Zhang <qi.z.zhang@intel.com>,
	Qiming Yang <qiming.yang@intel.com>,
	Rasesh Mody <rmody@marvell.com>,
	Shahaf Shuler <shahafs@mellanox.com>,
	Shahed Shaikh <shshaikh@marvell.com>,
	Somnath Kotur <somnath.kotur@broadcom.com>,
	Viacheslav Ovsiienko <viacheslavo@mellanox.com>,
	Wenzhuo Lu <wenzhuo.lu@intel.com>,
	Xiao Wang <xiao.w.wang@intel.com>,
	Yongseok Koh <yskoh@mellanox.com>
Subject: Re: [dpdk-dev] [PATCH v4 2/4] eal: fix IOVA mode selection as VA for PCI drivers
Date: Mon, 25 Nov 2019 12:58:49 +0000
Message-ID: <7aeaca3a-fc13-c440-2d6f-947c24def572@intel.com> (raw)
In-Reply-To: <CAJFAV8zvw9F2MjsGUPKXv2c6Qhyr0wXpkDTkrXEmvtSTw676Tw@mail.gmail.com>

On 25-Nov-19 12:36 PM, David Marchand wrote:
> On Mon, Nov 25, 2019 at 1:03 PM Ferruh Yigit <ferruh.yigit@intel.com> wrote:
>>>> I would like to get your comment on the issue.
>>>>
>>>> For the OvS mode, hopefully binding the device to 'vfio-pci'
>>>> can be a solution, but for the cases we don't have that option,
>>>> can/should we force the DPDK to PA mode after initialization?
>>>
>>> I think this is expected, because VA is the new default since 19.08:
>>> http://doc.dpdk.org/guides/rel_notes/release_19_08.html#new-features
>>>
>>> In case, there is no constraint on initialization,
>>> we have to decide which mode is preferred.
>>> Previously PA was preferred.
>>> For the sake of modernity (and because it fits with some new devices),
>>> the preference has been changed to VA.
>>>
>>> If igb_uio device is used at initialization,
>>> the PA mode should be used.
>>> If igb_uio (PA-only) device is hotplugged, no luck!
>>> If VA-only device is hotplugged, it works!
>>>
>>> I think this change is one step in deprecating igb_uio.
>>>
>>
>> I just want to confirm/clarify that this behavior change is by design, not a defect.
>> Should we document this behavior change more clearly, or highlight more, to not
>> let catch others too?
> 
> The behavior change happened with:
> https://git.dpdk.org/dpdk/commit?id=bbe29a9bd7ab6feab9a52051c32092a94ee886eb
> And there is an entry in the 19.08 release notes:
> http://doc.dpdk.org/guides/rel_notes/release_19_08.html#new-features
> 
> 

Should we perhaps also provide LTS release notes, i.e. "all changes 
since last LTS"? I think it's unreasonable to expect people using LTS's 
to trace through every release notes between LTS's.

-- 
Thanks,
Anatoly

  reply index

Thread overview: 57+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-10 21:48 [dpdk-dev] [PATCH 0/2] Fixes on IOVA mode selection David Marchand
2019-07-10 21:48 ` [dpdk-dev] [PATCH 1/2] Revert "bus/pci: add Mellanox kernel driver type" David Marchand
2019-07-16 10:37   ` [dpdk-dev] [EXT] " Jerin Jacob Kollanukkaran
2019-07-10 21:48 ` [dpdk-dev] [PATCH 2/2] eal: fix IOVA mode selection as VA for pci drivers David Marchand
2019-07-11 14:40   ` Thomas Monjalon
2019-07-12  8:05     ` Jerin Jacob Kollanukkaran
2019-07-12 11:03   ` Burakov, Anatoly
2019-07-12 12:43     ` Thomas Monjalon
2019-07-12 12:58       ` Burakov, Anatoly
2019-07-12 13:19         ` Bruce Richardson
2019-07-15 14:26       ` Jerin Jacob Kollanukkaran
2019-07-15 15:03         ` Thomas Monjalon
2019-07-15 15:35           ` Jerin Jacob Kollanukkaran
2019-07-15 16:06             ` Thomas Monjalon
2019-07-15 16:27               ` Jerin Jacob Kollanukkaran
2019-07-16 13:46 ` [dpdk-dev] [PATCH v2 0/4] Fixes on IOVA mode selection jerinj
2019-07-16 13:46   ` [dpdk-dev] [PATCH v2 1/4] Revert "bus/pci: add Mellanox kernel driver type" jerinj
2019-07-16 13:46   ` [dpdk-dev] [PATCH v2 2/4] eal: fix IOVA mode selection as VA for pci drivers jerinj
2019-07-16 14:26     ` Burakov, Anatoly
2019-07-16 15:07       ` Jerin Jacob Kollanukkaran
2019-07-16 13:46   ` [dpdk-dev] [PATCH v2 3/4] eal: change RTE_PCI_DRV_IOVA_AS_VA flag name jerinj
2019-07-16 13:46   ` [dpdk-dev] [PATCH v2 4/4] eal: select IOVA mode as VA for default case jerinj
2019-07-16 14:33     ` Burakov, Anatoly
2019-07-17  8:33       ` [dpdk-dev] [EXT] " Jerin Jacob Kollanukkaran
2019-07-17 12:38         ` Burakov, Anatoly
2019-07-17 14:04           ` Jerin Jacob Kollanukkaran
2019-07-18  6:45   ` [dpdk-dev] [PATCH v3 0/4] Fixes on IOVA mode selection jerinj
2019-07-18  6:45     ` [dpdk-dev] [PATCH v3 1/4] Revert "bus/pci: add Mellanox kernel driver type" jerinj
2019-07-18  6:45     ` [dpdk-dev] [PATCH v3 2/4] eal: fix IOVA mode selection as VA for pci drivers jerinj
2019-07-18  6:45     ` [dpdk-dev] [PATCH v3 3/4] eal: change RTE_PCI_DRV_IOVA_AS_VA flag name jerinj
2019-07-18  6:45     ` [dpdk-dev] [PATCH v3 4/4] eal: select IOVA mode as VA for default case jerinj
2019-07-22 11:28     ` [dpdk-dev] [PATCH v3 0/4] Fixes on IOVA mode selection David Marchand
2019-07-22 12:56 ` [dpdk-dev] [PATCH v4 " David Marchand
2019-07-22 12:56   ` [dpdk-dev] [PATCH v4 1/4] Revert "bus/pci: add Mellanox kernel driver type" David Marchand
2019-07-22 12:56   ` [dpdk-dev] [PATCH v4 2/4] eal: fix IOVA mode selection as VA for PCI drivers David Marchand
2019-11-25  9:33     ` Ferruh Yigit
2019-11-25 10:22       ` Thomas Monjalon
2019-11-25 12:03         ` Ferruh Yigit
2019-11-25 12:36           ` David Marchand
2019-11-25 12:58             ` Burakov, Anatoly [this message]
2019-11-25 14:29               ` Thomas Monjalon
2019-11-25 11:07       ` Jerin Jacob
2019-07-22 12:56   ` [dpdk-dev] [PATCH v4 3/4] drivers: change IOVA as VA PCI flag name David Marchand
2019-07-22 12:56   ` [dpdk-dev] [PATCH v4 4/4] eal: select IOVA as VA mode for default case David Marchand
2019-07-22 15:53   ` [dpdk-dev] [PATCH v4 0/4] Fixes on IOVA mode selection Thomas Monjalon
2019-07-23  3:35     ` Stojaczyk, Dariusz
2019-07-23  4:18       ` Jerin Jacob Kollanukkaran
2019-07-23  4:54         ` Stojaczyk, Dariusz
2019-07-23  5:27           ` Jerin Jacob Kollanukkaran
2019-07-23  7:21             ` Thomas Monjalon
2019-07-23  9:57             ` Burakov, Anatoly
2019-07-23 10:25               ` Thomas Monjalon
2019-07-23 13:56                 ` Burakov, Anatoly
2019-07-23 14:24                   ` [dpdk-dev] [EXT] " Jerin Jacob Kollanukkaran
2019-07-23 14:29                   ` [dpdk-dev] " Burakov, Anatoly
2019-07-23 14:36                     ` [dpdk-dev] [EXT] " Jerin Jacob Kollanukkaran
2019-07-23 15:47                       ` Burakov, Anatoly

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