From: "谢华伟(此时此刻)" <huawei.xhw@alibaba-inc.com>
To: Ferruh Yigit <ferruh.yigit@intel.com>,
Maxime Coquelin <maxime.coquelin@redhat.com>
Cc: dev@dpdk.org, anatoly.burakov@intel.com,
david.marchand@redhat.com, chenbo.xia@intel.com, grive@u256.net,
"Xueming(Steven) Li" <xuemingl@nvidia.com>
Subject: Re: [dpdk-dev] [PATCH v5 3/3] PCI: don't use vfio ioctl call to access PIO resource
Date: Thu, 28 Jan 2021 21:43:57 +0800 [thread overview]
Message-ID: <9866192f-f678-ec59-9ca4-2d0a5bed6470@alibaba-inc.com> (raw)
In-Reply-To: <21913480-a3d8-81d5-b493-c8d9657fc68f@intel.com>
On 2021/1/28 0:45, Ferruh Yigit wrote:
> On 1/27/2021 2:43 PM, 谢华伟(此时此刻) wrote:
>>
>> On 2021/1/27 18:32, Ferruh Yigit wrote:
>>> I was waiting for clarification if this can be solved in virtio,
>>> which seems clarified and decided to go with this patch, I am OK to
>>> proceed with patch 1 & 2.
>>>
>>> But first patch changes how PIO address get, it changes the Linux
>>> interface used to get the PIO.
>>> And as far as I can see second patch requires this new interface to
>>> be able to access the MEM resources.
>>>
>>> I have a concern that this interface change may cause issues with
>>> various distros, kernel versions etc.. And prefer it goes through a
>>> full -rc1 validation cycle.
>>>
>>> Huawei, I am aware the patch is around for a while but to play safe,
>>> I suggest considering it for early next release, so it can be tested
>>> enough, instead of getting if for -rc2/3 in this release.
>>>
>>> Thanks,
>>> ferruh
>>>
>> Hi Ferruh and Maxime:
>>
>> igb_uio kernel driver gets resource through pci_resource_start, i.e,
>> (dev)->resource[(bar)].start
>>
>> uio_pci_generic and the generic way in my patch 1 gets resource
>> through the same interface:
>>
>> pci dev driver exports to userspace the bar resource
>> attributes through pci_dev->resource (check resource_show in kernel's
>> drivers/pci/pci-sysfs.c)
>>
>> Other arch than x86 uses the same interface in their pci_uio_ioport_map.
>>
>> So patch 1 is the most generic way and shouldn't break things.
>> /proc/ioports should be fully dropped.
>>
>> Using /proc/ioport is partly my fault at the very beginning. It
>> causes so much mess.
>>
>> Could you please confirm this?
>>
>
> Hi Huawei,
>
> I confirm that interface is already in use,
> 'pci_parse_sysfs_resource()' does similar parsing.
>
> Most probably it is safe as you and Maxime said, and I am not trying
> to be difficult but extra conscious here.
>
> Will it cause too much trouble to consider the patch early next
> release? This gives more time and testing after the patch merged.
>
> Thanks,
> ferruh
Hi Ferruh:
If early next release, what is about the schedule, early next February?
In summary, patch 1 is simple and straightforward. It just don't use
/proc/ioports and don't use resource attribute created by igb_uio and
use the standard resource attribute under /sys/pci/.
As i explained, the resource attribute created by igb_uio is exactly the
same thing as the standard resource attribute under /sys/pci/.
Patch 1 fixes messy things. Patch 2 fixes wrong assumptions (BAR is IO bar).
Customers have been pushing us for quite a long time. Besides, at least
in China, virtio in VM with MMIO bar is a de-facto implementation. It
brings quite much trouble not only to cloud users, but also to us self
when we run DPDK.
>
>> Thanks huawei
>>
>>>> Could you please post v6?
>>>>
>>>> Thanks,
>>>> Maxime
>>>>
>>>>>>
>>>>>> It is not too late for this release, as the change will not be that
>>>>>> intrusive. But if you prepare such patch, please base it on top
>>>>>> of my
>>>>>> virtio rework series; To make it easier to you, I added it to the
>>>>>> dpdk-
>>>>>> next-virtio tree:
>>>>>> https://git.dpdk.org/next/dpdk-next-virtio/log/?h=virtio_pmd_rework_v2
>>>>>>
>>>>>>
>>>>>> Thanks,
>>>>>> Maxime
>>>>>>
>>>>>
next prev parent reply other threads:[~2021-01-28 13:44 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-30 14:59 [dpdk-dev] [PATCH v2] pci: support both PIO and MMIO BAR for legacy virtio on x86 谢华伟(此时此刻)
2020-10-01 10:22 ` Burakov, Anatoly
2020-10-02 5:44 ` 谢华伟(此时此刻)
2020-10-09 8:36 ` [dpdk-dev] [PATCH v3] " 谢华伟(此时此刻)
2020-10-13 8:41 ` [dpdk-dev] [PATCH v4] support both PIO and MMIO bar for virtio pci device 谢华伟(此时此刻)
2020-10-13 8:41 ` [dpdk-dev] [PATCH v4] pci: support both PIO and MMIO BAR for legacy virtio on x86 谢华伟(此时此刻)
2020-10-13 12:34 ` 谢华伟(此时此刻)
2020-10-21 8:46 ` 谢华伟(此时此刻)
2020-10-21 11:49 ` Ferruh Yigit
2020-10-21 12:32 ` 谢华伟(此时此刻)
2020-10-21 17:24 ` Ferruh Yigit
2020-10-22 9:15 ` 谢华伟(此时此刻)
2020-10-22 9:44 ` Ferruh Yigit
2020-10-22 9:57 ` 谢华伟(此时此刻)
2020-10-22 15:51 ` [dpdk-dev] [PATCH v5 0/3] support both PIO and MMIO BAR for virtio PMD 谢华伟(此时此刻)
2020-10-22 15:51 ` [dpdk-dev] [PATCH v5 1/3] PCI: use PCI standard sysfs entry to get PIO address 谢华伟(此时此刻)
2021-01-12 8:07 ` Maxime Coquelin
2021-01-14 18:23 ` 谢华伟(此时此刻)
2021-01-24 15:10 ` Xueming(Steven) Li
2020-10-22 15:51 ` [dpdk-dev] [PATCH v5 2/3] PCI: support MMIO in rte_pci_ioport_map/unap/read/write 谢华伟(此时此刻)
2021-01-12 8:23 ` Maxime Coquelin
2021-01-21 6:30 ` 谢华伟(此时此刻)
2021-01-24 15:22 ` Xueming(Steven) Li
2021-01-25 3:08 ` 谢华伟(此时此刻)
2021-01-27 10:40 ` Ferruh Yigit
2021-01-27 15:34 ` 谢华伟(此时此刻)
2021-01-27 16:45 ` Ferruh Yigit
2020-10-22 15:51 ` [dpdk-dev] [PATCH v5 3/3] PCI: don't use vfio ioctl call to access PIO resource 谢华伟(此时此刻)
2021-01-12 9:37 ` Maxime Coquelin
2021-01-12 16:58 ` Maxime Coquelin
2021-01-20 14:54 ` 谢华伟(此时此刻)
2021-01-21 8:29 ` Maxime Coquelin
2021-01-21 14:57 ` 谢华伟(此时此刻)
2021-01-21 15:00 ` 谢华伟(此时此刻)
2021-01-21 15:38 ` Maxime Coquelin
2021-01-22 7:25 ` 谢华伟(此时此刻)
2021-01-26 10:44 ` Maxime Coquelin
2021-01-27 10:32 ` Ferruh Yigit
2021-01-27 12:17 ` Maxime Coquelin
2021-01-27 14:43 ` 谢华伟(此时此刻)
2021-01-27 16:45 ` Ferruh Yigit
2021-01-28 13:43 ` 谢华伟(此时此刻) [this message]
2021-01-26 12:30 ` 谢华伟(此时此刻)
2021-01-26 12:35 ` Maxime Coquelin
2021-01-26 14:24 ` 谢华伟(此时此刻)
2020-10-27 8:50 ` [dpdk-dev] [PATCH v5 0/3] support both PIO and MMIO BAR for virtio PMD 谢华伟(此时此刻)
2020-10-28 3:48 ` 谢华伟(此时此刻)
2020-11-02 11:56 ` 谢华伟(此时此刻)
2020-11-10 12:35 ` 谢华伟(此时此刻)
2020-11-10 12:42 ` David Marchand
2020-11-12 13:35 ` 谢华伟(此时此刻)
2020-12-14 14:24 ` 谢华伟(此时此刻)
2020-12-16 7:54 ` Maxime Coquelin
2021-01-12 17:37 ` Maxime Coquelin
2021-01-14 18:19 ` 谢华伟(此时此刻)
2021-01-21 4:12 ` 谢华伟(此时此刻)
2021-01-21 8:47 ` Maxime Coquelin
2021-01-21 13:51 ` 谢华伟(此时此刻)
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