quoted

No, it won't need 2 transitions - just an extra function call,
so it won't hurt performance - it would improve performance.

ib_uverbs_req_notify_cq would call

	ib_uverbs_req_notify_cq()
	{
			ib_set_cq_udata(cq, udata)
			ib_req_notify_cq(cq, cmd.solicited_only ?
				IB_CQ_SOLICITED : IB_CQ_NEXT_COMP);
	}

ib_set_cq_udata() would transition into the kernel to pass in the
consumer's index.  In addition, ib_req_notify_cq would also transition
into the kernel since its not a bypass function for chelsio.

We misunderstand each other.

ib_uverbs_req_notify_cq is in drivers/infiniband/core/uverbs_cmd.c -
all this code runs inside the IB_USER_VERBS_CMD_REQ_NOTIFY_CQ command,
so there is a single user to kernel transition.

-- 
MST