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From: Bjorn Helgaas <helgaas@kernel.org>
To: Dongdong Liu <liudongdong3@huawei.com>
Cc: hch@infradead.org, kw@linux.com, logang@deltatee.com,
	leon@kernel.org, linux-pci@vger.kernel.org, rajur@chelsio.com,
	hverkuil-cisco@xs4all.nl, linux-media@vger.kernel.org,
	netdev@vger.kernel.org
Subject: Re: [PATCH V7 5/9] PCI/IOV: Enable 10-Bit tag support for PCIe VF devices
Date: Fri, 6 Aug 2021 17:59:17 -0500	[thread overview]
Message-ID: <20210806225917.GA1897594@bjorn-Precision-5520> (raw)
In-Reply-To: <08b7a9b7-2951-43c3-5e81-3461b6724955@huawei.com>

On Thu, Aug 05, 2021 at 04:03:58PM +0800, Dongdong Liu wrote:
> 
> On 2021/8/5 7:29, Bjorn Helgaas wrote:
> > On Wed, Aug 04, 2021 at 09:47:04PM +0800, Dongdong Liu wrote:
> > > Enable VF 10-Bit Tag Requester when it's upstream component support
> > > 10-bit Tag Completer.
> > 
> > I think "upstream component" here means the PF, doesn't it?  I don't
> > think the PF is really an *upstream* component; there's no routing
> > like with a switch.
>
> I want to say the switch and root port devices that support 10-Bit
> Tag Completer. Sure, VF also needs to have 10-bit Tag Requester
> Supported capability.

OK.  IIUC we're not talking about P2PDMA here; we're talking about
regular DMA to host memory, which means I *think* only the Root Port
is important, since it is the completer for DMA to host memory.  We're
not talking about P2PDMA to a switch BAR, where the switch would be
the completer.

  reply	other threads:[~2021-08-06 22:59 UTC|newest]

Thread overview: 43+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-04 13:46 [PATCH V7 0/9] PCI: Enable 10-Bit tag support for PCIe devices Dongdong Liu
2021-08-04 13:47 ` [PATCH V7 1/9] PCI: Use cached Device Capabilities Register Dongdong Liu
2021-08-04 13:47 ` [PATCH V7 2/9] PCI: Use cached Device Capabilities 2 Register Dongdong Liu
2021-08-04 13:47 ` [PATCH V7 3/9] PCI: Add 10-Bit Tag register definitions Dongdong Liu
2021-08-04 13:47 ` [PATCH V7 4/9] PCI: Enable 10-Bit Tag support for PCIe Endpoint devices Dongdong Liu
2021-08-04 23:17   ` Bjorn Helgaas
2021-08-05  7:47     ` Dongdong Liu
2021-08-05 19:54       ` Bjorn Helgaas
2021-08-07  6:19         ` Dongdong Liu
2021-08-04 13:47 ` [PATCH V7 5/9] PCI/IOV: Enable 10-Bit tag support for PCIe VF devices Dongdong Liu
2021-08-04 23:29   ` Bjorn Helgaas
2021-08-05  8:03     ` Dongdong Liu
2021-08-06 22:59       ` Bjorn Helgaas [this message]
2021-08-07  7:46         ` Dongdong Liu
2021-08-04 13:47 ` [PATCH V7 6/9] PCI: Enable 10-Bit Tag support for PCIe RP devices Dongdong Liu
2021-08-04 23:38   ` Bjorn Helgaas
2021-08-05  8:25     ` Dongdong Liu
2021-08-09 17:26       ` Bjorn Helgaas
2021-08-10 11:59         ` Dongdong Liu
2021-08-04 13:47 ` [PATCH V7 7/9] PCI/sysfs: Add a 10-Bit Tag sysfs file Dongdong Liu
2021-08-04 15:51   ` Logan Gunthorpe
2021-08-05 13:14     ` Dongdong Liu
2021-08-05 13:53       ` Leon Romanovsky
2021-08-05 15:36       ` Logan Gunthorpe
2021-08-04 23:49   ` Bjorn Helgaas
2021-08-05  8:37     ` Dongdong Liu
2021-08-05 15:31       ` Bjorn Helgaas
2021-08-07  7:01         ` Dongdong Liu
2021-08-09 17:37           ` Bjorn Helgaas
2021-08-10 12:16             ` Dongdong Liu
2021-08-04 23:52   ` Bjorn Helgaas
2021-08-05  8:38     ` Dongdong Liu
2021-08-04 13:47 ` [PATCH V7 8/9] PCI/IOV: Add 10-Bit Tag sysfs files for VF devices Dongdong Liu
2021-08-05  0:05   ` Bjorn Helgaas
2021-08-05  8:47     ` Dongdong Liu
2021-08-05  9:39     ` Dongdong Liu
2021-08-04 13:47 ` [PATCH V7 9/9] PCI/P2PDMA: Add a 10-Bit Tag check in P2PDMA Dongdong Liu
2021-08-04 15:56   ` Logan Gunthorpe
2021-08-05  8:49     ` Dongdong Liu
2021-08-05 18:12   ` Bjorn Helgaas
2021-08-07  7:11     ` Dongdong Liu
2021-08-09 17:31       ` Bjorn Helgaas
2021-08-10 12:31         ` Dongdong Liu

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