nvme-rdma: Fix device removal handling
Device removal sequence may have crashed because the controller (and admin queue space) was freed before we destroyed the admin queue resources. Thus we want to destroy the admin queue and only then queue controller deletion and wait for it to complete. More specifically we: 1. own the controller deletion (make sure we are not competing with another deletion). 2. get rid of inflight reconnects if exists (which also destroy and create queues). 3. destroy the queue. 4. safely queue controller deletion (and wait for it to complete). Reported-by: Steve Wise <swise@opengridcomputing.com> Signed-off-by: Sagi Grimberg <sagi@grimberg.me> Reviewed-by: Christoph Hellwig <hch@lst.de>
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@ -169,7 +169,6 @@ MODULE_PARM_DESC(register_always,
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static int nvme_rdma_cm_handler(struct rdma_cm_id *cm_id,
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static int nvme_rdma_cm_handler(struct rdma_cm_id *cm_id,
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struct rdma_cm_event *event);
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struct rdma_cm_event *event);
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static void nvme_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc);
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static void nvme_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc);
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static int __nvme_rdma_del_ctrl(struct nvme_rdma_ctrl *ctrl);
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/* XXX: really should move to a generic header sooner or later.. */
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/* XXX: really should move to a generic header sooner or later.. */
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static inline void put_unaligned_le24(u32 val, u8 *p)
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static inline void put_unaligned_le24(u32 val, u8 *p)
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@ -1320,37 +1319,39 @@ out_destroy_queue_ib:
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* that caught the event. Since we hold the callout until the controller
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* that caught the event. Since we hold the callout until the controller
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* deletion is completed, we'll deadlock if the controller deletion will
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* deletion is completed, we'll deadlock if the controller deletion will
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* call rdma_destroy_id on this queue's cm_id. Thus, we claim ownership
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* call rdma_destroy_id on this queue's cm_id. Thus, we claim ownership
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* of destroying this queue before-hand, destroy the queue resources
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* of destroying this queue before-hand, destroy the queue resources,
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* after the controller deletion completed with the exception of destroying
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* then queue the controller deletion which won't destroy this queue and
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* the cm_id implicitely by returning a non-zero rc to the callout.
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* we destroy the cm_id implicitely by returning a non-zero rc to the callout.
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*/
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*/
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static int nvme_rdma_device_unplug(struct nvme_rdma_queue *queue)
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static int nvme_rdma_device_unplug(struct nvme_rdma_queue *queue)
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{
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{
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struct nvme_rdma_ctrl *ctrl = queue->ctrl;
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struct nvme_rdma_ctrl *ctrl = queue->ctrl;
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int ret, ctrl_deleted = 0;
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int ret;
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/* First disable the queue so ctrl delete won't free it */
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/* Own the controller deletion */
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if (!test_and_clear_bit(NVME_RDMA_Q_CONNECTED, &queue->flags))
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if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_DELETING))
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goto out;
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return 0;
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/* delete the controller */
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ret = __nvme_rdma_del_ctrl(ctrl);
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if (!ret) {
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dev_warn(ctrl->ctrl.device,
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dev_warn(ctrl->ctrl.device,
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"Got rdma device removal event, deleting ctrl\n");
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"Got rdma device removal event, deleting ctrl\n");
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flush_work(&ctrl->delete_work);
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/* Get rid of reconnect work if its running */
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cancel_delayed_work_sync(&ctrl->reconnect_work);
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/* Disable the queue so ctrl delete won't free it */
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if (test_and_clear_bit(NVME_RDMA_Q_CONNECTED, &queue->flags)) {
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/* Free this queue ourselves */
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nvme_rdma_stop_queue(queue);
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nvme_rdma_destroy_queue_ib(queue);
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/* Return non-zero so the cm_id will destroy implicitly */
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/* Return non-zero so the cm_id will destroy implicitly */
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ctrl_deleted = 1;
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ret = 1;
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/* Free this queue ourselves */
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rdma_disconnect(queue->cm_id);
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ib_drain_qp(queue->qp);
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nvme_rdma_destroy_queue_ib(queue);
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}
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}
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out:
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/* Queue controller deletion */
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return ctrl_deleted;
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queue_work(nvme_rdma_wq, &ctrl->delete_work);
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flush_work(&ctrl->delete_work);
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return ret;
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}
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}
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static int nvme_rdma_cm_handler(struct rdma_cm_id *cm_id,
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static int nvme_rdma_cm_handler(struct rdma_cm_id *cm_id,
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