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From: Ferruh Yigit <ferruh.yigit@intel.com>
To: Thomas Monjalon <thomas@monjalon.net>
Cc: david.marchand@redhat.com, ajit.khaparde@broadcom.com,
	alejandro.lucero@netronome.com, anatoly.burakov@intel.com,
	beilei.xing@intel.com, bruce.richardson@intel.com, dev@dpdk.org,
	hyonkim@cisco.com, igor.russkikh@aquantia.com,
	jerinj@marvell.com, jingjing.wu@intel.com,
	john.mcnamara@intel.com, johndale@cisco.com,
	kirankumark@marvell.com, konstantin.ananyev@intel.com,
	marko.kovacevic@intel.com, matan@mellanox.com,
	ndabilpuram@marvell.com, pavel.belous@aquantia.com,
	qi.z.zhang@intel.com, qiming.yang@intel.com, rmody@marvell.com,
	shahafs@mellanox.com, shshaikh@marvell.com,
	somnath.kotur@broadcom.com, viacheslavo@mellanox.com,
	wenzhuo.lu@intel.com, xiao.w.wang@intel.com, 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 12:03:44 +0000
Message-ID: <7d735fc8-a80c-3517-8d8e-8eced554d13f@intel.com> (raw)
In-Reply-To: <9486799.kn5VEkfAUu@xps>

On 11/25/2019 10:22 AM, Thomas Monjalon wrote:
> 25/11/2019 10:33, Ferruh Yigit:
>> It looks like DPDK application initialized as IOVA=VA,
>> and the new device is bound to 'igb_uio' which forces it to PA,
>> fails on above check.
> 
> Do you mean this use case was not tested earlier with DPDK 19.08?

Perhaps, just a guess, this can be side affect of only using LTS.

> 
> 
>> 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?


  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 [this message]
2019-11-25 12:36           ` David Marchand
2019-11-25 12:58             ` Burakov, Anatoly
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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