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@xxxxxxxxxx> > + 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/
