netdev - Re: [PATCH V7 7/9] PCI/sysfs: Add a 10-Bit Tag sysfs file

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Date:   Thu, 5 Aug 2021 16:38:54 +0800
From:   Dongdong Liu <liudongdong3@...wei.com>
To:     Bjorn Helgaas <helgaas@...nel.org>
CC:     <hch@...radead.org>, <kw@...ux.com>, <logang@...tatee.com>,
        <leon@...nel.org>, <linux-pci@...r.kernel.org>,
        <rajur@...lsio.com>, <hverkuil-cisco@...all.nl>,
        <linux-media@...r.kernel.org>, <netdev@...r.kernel.org>
Subject: Re: [PATCH V7 7/9] PCI/sysfs: Add a 10-Bit Tag sysfs file


On 2021/8/5 7:52, Bjorn Helgaas wrote:
> On Wed, Aug 04, 2021 at 09:47:06PM +0800, Dongdong Liu wrote:
>> PCIe spec 5.0 r1.0 section 2.2.6.2 says that if an Endpoint supports
>> sending Requests to other Endpoints (as opposed to host memory), the
>> Endpoint must not send 10-Bit Tag Requests to another given Endpoint
>> unless an implementation-specific mechanism determines that the Endpoint
>> supports 10-Bit Tag Completer capability. Add a 10bit_tag sysfs file,
>> write 0 to disable 10-Bit Tag Requester when the driver does not bind
>> the device if the peer device does not support the 10-Bit Tag Completer.
>> This will make P2P traffic safe. the 10bit_tag file content indicate
>> current 10-Bit Tag Requester Enable status.
>>
>> Signed-off-by: Dongdong Liu <liudongdong3@...wei.com>
>
>> +		The file is also writeable, the value only accept by write 0
>> +		to disable 10-Bit Tag Requester when the driver does not bind
>> +		the deivce. The typical use case is for p2pdma when the peer
>> +		device does not support 10-BIT Tag Completer.
>
> s/10-BIT/10-Bit/
Will fix and will check other place.

Thank,
Dongdong
> .
>