Messages in this thread Patch in this message | | | From | Daniel Wagner <> | Subject | [PATCH v0 6/6] nvme-fc: wait for connect attempt to finish | Date | Fri, 16 Feb 2024 09:45:26 +0100 |
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The FC transport offloads the connect attempt to a workqueue. Thus userspace is not able to wait on the result.
Thus, allow userspace to wait on the connect result by honnering the 'connect_sync' connect option.
Signed-off-by: Daniel Wagner <dwagner@suse.de> --- drivers/nvme/host/fc.c | 26 +++++++++++++++++++++++++- 1 file changed, 25 insertions(+), 1 deletion(-)
diff --git a/drivers/nvme/host/fc.c b/drivers/nvme/host/fc.c index 7f9edab57550..5f1d0165de40 100644 --- a/drivers/nvme/host/fc.c +++ b/drivers/nvme/host/fc.c @@ -169,6 +169,7 @@ struct nvme_fc_ctrl { struct work_struct ioerr_work; struct delayed_work connect_work; + struct completion connect_completion; struct kref ref; unsigned long flags; @@ -803,6 +804,7 @@ nvme_fc_ctrl_connectivity_loss(struct nvme_fc_ctrl *ctrl) dev_warn(ctrl->ctrl.device, "NVME-FC{%d}: Couldn't schedule reset.\n", ctrl->cnum); + complete(&ctrl->connect_completion); nvme_fc_ctrl_put(ctrl); } break; @@ -871,6 +873,7 @@ nvme_fc_unregister_remoteport(struct nvme_fc_remote_port *portptr) dev_warn(ctrl->ctrl.device, "NVME-FC{%d}: controller connectivity lost.\n", ctrl->cnum); + complete(&ctrl->connect_completion); nvme_fc_ctrl_put(ctrl); } else nvme_fc_ctrl_connectivity_loss(ctrl); @@ -3308,6 +3311,7 @@ nvme_fc_reconnect_or_delete(struct nvme_fc_ctrl *ctrl, int status) ctrl->cnum, min_t(int, portptr->dev_loss_tmo, (ctrl->ctrl.opts->max_reconnects * ctrl->ctrl.opts->reconnect_delay))); + complete(&ctrl->connect_completion); nvme_fc_ctrl_put(ctrl); } } @@ -3367,10 +3371,12 @@ nvme_fc_connect_ctrl_work(struct work_struct *work) ret = nvme_fc_create_association(ctrl); if (ret) nvme_fc_reconnect_or_delete(ctrl, ret); - else + else { dev_info(ctrl->ctrl.device, "NVME-FC{%d}: controller connect complete\n", ctrl->cnum); + complete(&ctrl->connect_completion); + } } @@ -3477,6 +3483,7 @@ nvme_fc_init_ctrl(struct device *dev, struct nvmf_ctrl_options *opts, INIT_WORK(&ctrl->ctrl.reset_work, nvme_fc_reset_ctrl_work); INIT_DELAYED_WORK(&ctrl->connect_work, nvme_fc_connect_ctrl_work); + init_completion(&ctrl->connect_completion); INIT_WORK(&ctrl->ioerr_work, nvme_fc_ctrl_ioerr_work); spin_lock_init(&ctrl->lock); @@ -3524,6 +3531,9 @@ nvme_fc_init_ctrl(struct device *dev, struct nvmf_ctrl_options *opts, list_add_tail(&ctrl->ctrl_list, &rport->ctrl_list); spin_unlock_irqrestore(&rport->lock, flags); + if (opts->connect_sync) + nvme_fc_ctrl_get(ctrl); + if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_RESETTING) || !nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_CONNECTING)) { dev_err(ctrl->ctrl.device, @@ -3540,6 +3550,19 @@ nvme_fc_init_ctrl(struct device *dev, struct nvmf_ctrl_options *opts, flush_delayed_work(&ctrl->connect_work); + if (opts->connect_sync) { + enum nvme_ctrl_state state; + + wait_for_completion(&ctrl->connect_completion); + state = nvme_ctrl_state(&ctrl->ctrl); + nvme_fc_ctrl_put(ctrl); + + if (state != NVME_CTRL_LIVE) { + /* Cleanup is handled by the connect state machine */ + return ERR_PTR(-EIO); + } + } + dev_info(ctrl->ctrl.device, "NVME-FC{%d}: new ctrl: NQN \"%s\", hostnqn: %s\n", ctrl->cnum, nvmf_ctrl_subsysnqn(&ctrl->ctrl), opts->host->nqn); @@ -3896,6 +3919,7 @@ nvme_fc_delete_controllers(struct nvme_fc_rport *rport) dev_warn(ctrl->ctrl.device, "NVME-FC{%d}: transport unloading: deleting ctrl\n", ctrl->cnum); + complete(&ctrl->connect_completion); nvme_fc_ctrl_put(ctrl); } spin_unlock(&rport->lock); -- 2.43.0
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