[ofa-general] [PATCH RFC v3 1/2] RDMA/Core: MEM_MGT_EXTENSIONS support

[Roland Dreier]

 >  > static void ib_update_fast_reg_key(struct ib_mr *mr, u8 newkey)
 >  > {
 >  > 	/* iWARP: rkey == lkey */
 > 
 > actually I need to reread the IB spec and understand how the consumer
 > key part of L_Key and R_Key is supposed to work... for Mellanox adapters
 > at least the L_Key and R_Key are the same too.
 > 
 >  > 	if (mr->rkey == mr->lkey)
 >  > 		mr->lkey = mr->lkey & 0xffffff00 | newkey;
 >  > 	mr->rkey = mr->rkey & 0xffffff00 | newkey;
 >  > }

I just looked in the IB spec (1.2.1) and it talks about passing the "Key
to use on the new L_Key and R_Key" into a fastreg work request.

So I think we can just can the test for rkey==lkey and just do

	mr->lkey = mr->lkey & 0xffffff00 | newkey;
	mr->rkey = mr->rkey & 0xffffff00 | newkey;

 - R.