> There is confusion about lkeys and rkeys with regard to iWARP. In the > iWARP verbs, there is no distinction between an lkey and > rkey: they are the same key, called a Steering Tag or STAG. When you > create a MR, the lkey == rkey == STAG for iwarp transports. > Somewhat related, but really a different issue, is that SGEs that are the > target of a read need REMOTE_WRITE access flags on their > STAG for iWARP. > > Clear as mud? :)
This may be a nit, but IMO, the use of the term 'rkey' versus 'stag' matters. They convey different ways of finding a data buffer. For example, do you locate a buffer using the stag, then verify that the offset + length fits into the target buffer? Or do you locate the buffer by address, then verify that the key matches? Consider if we allow an app to specify the rkey/stag, or reference the buffer using an offset, rather than a virtual address. This seems to be part of the difference between an lkey and an rkey. -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
