From: "Burakov, Anatoly" <anatoly.burakov@intel.com>
To: Jerin Jacob <jerin.jacob@caviumnetworks.com>,
Thomas Monjalon <thomas@monjalon.net>
Cc: Takeshi Yoshimura <t.yoshimura8869@gmail.com>, dev@dpdk.org
Subject: Re: [dpdk-dev] [PATCH v5] vfio: fix workaround of BAR mapping
Date: Mon, 30 Jul 2018 11:03:13 +0100 [thread overview]
Message-ID: <b2a1a644-c103-53e8-0732-fed3592be7a5@intel.com> (raw)
In-Reply-To: <a8ae80d5-cfc2-655d-4bfa-26fe18071965@intel.com>
On 30-Jul-18 9:51 AM, Burakov, Anatoly wrote:
> On 29-Jul-18 9:44 AM, Jerin Jacob wrote:
>> -----Original Message-----
>>> Date: Thu, 26 Jul 2018 11:35:43 +0200
>>> From: Thomas Monjalon <thomas@monjalon.net>
>>> To: Takeshi Yoshimura <t.yoshimura8869@gmail.com>
>>> Cc: dev@dpdk.org, Anatoly Burakov <anatoly.burakov@intel.com>
>>> Subject: Re: [dpdk-dev] [PATCH v5] vfio: fix workaround of BAR mapping
>>>
>>>
>>> 20/07/2018 10:13, Takeshi Yoshimura:
>>>> Currently, VFIO will try to map around MSI-X table in the BARs. When
>>>> MSI-X table (page-aligned) size is equal to (page-aligned) size of BAR,
>>>> VFIO will just skip the BAR.
>>>>
>>>> Recent kernel versions will allow VFIO to map the entire BAR containing
>>>> MSI-X tables (*), so instead of trying to map around the MSI-X vector
>>>> or skipping the BAR entirely if it's not possible, we can now try
>>>> mapping the entire BAR first. If mapping the entire BAR doesn't
>>>> succeed, fall back to the old behavior of mapping around MSI-X table or
>>>> skipping the BAR.
>>>>
>>>> (*): "vfio-pci: Allow mapping MSIX BAR",
>>>> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/
>>>> commit/?id=a32295c612c57990d17fb0f41e7134394b2f35f6
>>>>
>>>> Fixes: 90a1633b2347 ("eal/linux: allow to map BARs with MSI-X tables")
>>>>
>>>> Signed-off-by: Takeshi Yoshimura <t.yoshimura8869@gmail.com>
>>>> Reviewed-by: Anatoly Burakov <anatoly.burakov@intel.com>
>>
>>
>> This change set breaks thunderx/octeontx platform with following
>> error.(Tested with 4.9.0 kernel)
>>
>> EAL: probe driver: 177d:a034 net_thunderx
>> EAL: using IOMMU type 1 (Type 1)
>> EAL: pci_map_resource(): cannot mmap(44, 0xffff60200000, 0x200000,
>> 0x40000000000): Invalid argument (0xffffffffffffffff)
>> EAL: PCI device 0001:01:00.2 on NUMA socket 0
>> EAL: probe driver: 177d:a034 net_thunderx
>> EAL: pci_map_resource(): cannot mmap(47, 0xffff60600000, 0x200000,
>> 0x40000000000): Invalid argument (0xffffffffffffffff)
>>
>> According Linux kernel change, user space application suppose to use
>> VFIO_REGION_INFO_CAP_MSIX_MAPPABLE
>> capability to detect this feature to work < 4.15 kernel. Right? if so,
>> Why we
>> are doing this retry based logic?
>
> I don't think anything's broken there - just a gratuitous error message.
>
> But yes, i seem to have missed the region info flag. It was my
> suggestion to use the retry logic. I'll submit a patch fixing this.
>
The patch to fix it involves way more work than i am comfortable with
submitting to rc3, so i believe we should revert this patch and postpone
the change to 18.11.
--
Thanks,
Anatoly
prev parent reply other threads:[~2018-07-30 10:03 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-12 2:44 [dpdk-dev] [PATCH] vfio: fix workaround of BAR0 mapping Takeshi Yoshimura
2018-07-12 3:08 ` [dpdk-dev] [PATCH v2] " Takeshi Yoshimura
2018-07-12 9:10 ` Burakov, Anatoly
2018-07-13 10:11 ` [dpdk-dev] [PATCH v3] " Takeshi Yoshimura
2018-07-13 11:00 ` Burakov, Anatoly
2018-07-13 11:08 ` Burakov, Anatoly
2018-07-17 8:21 ` Takeshi Yoshimura
2018-07-17 8:22 ` [dpdk-dev] [PATCH v4] " Takeshi Yoshimura
2018-07-17 10:08 ` Burakov, Anatoly
2018-07-20 8:13 ` [dpdk-dev] [PATCH v5] vfio: fix workaround of BAR mapping Takeshi Yoshimura
2018-07-26 9:35 ` Thomas Monjalon
2018-07-29 8:44 ` Jerin Jacob
2018-07-30 8:51 ` Burakov, Anatoly
2018-07-30 10:03 ` Burakov, Anatoly [this message]
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