Sebastian Sanchez af8aab7137 IB/hfi1: Optimize kthread pointer locking when queuing CQ entries ... All threads queuing CQ entries on different CQs are unnecessarily synchronized by a spin lock to check if the CQ kthread worker hasn't been destroyed before queuing an CQ entry. The lock used in 6efaf10f16 ("IB/rdmavt: Avoid queuing work into a destroyed cq kthread worker") is a device global lock and will have poor performance at scale as completions are entered from a large number of CPUs. Convert to use RCU where the read side of RCU is rvt_cq_enter() to determine that the worker is alive prior to triggering the completion event. Apply write side RCU semantics in rvt_driver_cq_init() and rvt_cq_exit(). Fixes: 6efaf10f16 ("IB/rdmavt: Avoid queuing work into a destroyed cq kthread worker") Cc: <stable@vger.kernel.org> # 4.14.x Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com> Signed-off-by: Sebastian Sanchez <sebastian.sanchez@intel.com> Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com> Signed-off-by: Doug Ledford <dledford@redhat.com>		2018-05-09 15:53:30 -04:00
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rdmavt	IB/hfi1: Optimize kthread pointer locking when queuing CQ entries	2018-05-09 15:53:30 -04:00
rxe	Merge branch 'k.o/for-rc' into k.o/wip/dl-for-next	2018-05-09 15:48:48 -04:00
Makefile	Soft RoCE driver	2016-08-04 11:13:12 -04:00