On 2021-08-04 7:47 a.m., 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.

Can we not have both the sysfs file and the command line parameter? If
the user wants to disable it always for a specific device this sysfs
parameter is fairly awkward. A script at boot to unbind the driver, set
the sysfs file and rebind the driver is not trivial and the command line
parameter offers additional options for users.

Logan