From: root <root@xxxxxxxxxxxxxxxxxxxx> This series adds a new API to support a drain of a QP that is associated with a SRQ (Shared Receive Queue). Leakage problem can occur if we won't treat Last WQE Reached event: 1. QP may have consumed SRQ WQE, but no CQE received yet (especially in error flow that can take long time) 2. polling responder CQ at this stage is meaningless (since CQEs haven't been posted) 3. destroying QP at this point will cause SRQ credit leakage So the solution (according to IB spec): 1. modify QP to err state 2. wait for Last WQE Reached event 3. poll CQ to free SRQ WQEs completions 4. destroy the QP. In the series, I based on earlier patchset that enables direct polling the CQ regardless of the type. I've added support for ULPs: NVMe-oF, iSER and SRP as well. Max Gurtovoy (4): IB/core: add support for draining Shared receive queues nvmet-rdma: notify QP on Last WQE Reached event arrival iser-target: remove dead code IB/srpt: notify QP on Last WQE Reached event arrival drivers/infiniband/core/verbs.c | 69 ++++++++++++++++++++++++++++++++- drivers/infiniband/ulp/isert/ib_isert.c | 3 -- drivers/infiniband/ulp/srpt/ib_srpt.c | 1 + drivers/nvme/target/rdma.c | 3 ++ include/rdma/ib_verbs.h | 8 ++++ 5 files changed, 80 insertions(+), 4 deletions(-) -- 1.8.3.1 -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
