| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| James Smart | 13706 | 96.13% | 54 | 55.10% |
| Sagi Grimberg | 194 | 1.36% | 11 | 11.22% |
| Christoph Hellwig | 141 | 0.99% | 15 | 15.31% |
| Bart Van Assche | 98 | 0.69% | 3 | 3.06% |
| Johannes Thumshirn | 28 | 0.20% | 2 | 2.04% |
| Ewan D. Milne | 24 | 0.17% | 2 | 2.04% |
| Hannes Reinecke | 23 | 0.16% | 1 | 1.02% |
| Max Gurtovoy | 9 | 0.06% | 2 | 2.04% |
| Keith Busch | 9 | 0.06% | 2 | 2.04% |
| Israel Rukshin | 8 | 0.06% | 1 | 1.02% |
| Ming Lei | 6 | 0.04% | 1 | 1.02% |
| Roy Shterman | 5 | 0.04% | 1 | 1.02% |
| Jens Axboe | 4 | 0.03% | 1 | 1.02% |
| Milan P. Gandhi | 2 | 0.01% | 1 | 1.02% |
| Eric Biggers | 1 | 0.01% | 1 | 1.02% |
| Total | 14258 | 98 |
/* * Copyright (c) 2016 Avago Technologies. All rights reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of version 2 of the GNU General Public License as * published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful. * ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A * PARTICULAR PURPOSE, OR NON-INFRINGEMENT, ARE DISCLAIMED, EXCEPT TO * THE EXTENT THAT SUCH DISCLAIMERS ARE HELD TO BE LEGALLY INVALID. * See the GNU General Public License for more details, a copy of which * can be found in the file COPYING included with this package * */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/module.h> #include <linux/parser.h> #include <uapi/scsi/fc/fc_fs.h> #include <uapi/scsi/fc/fc_els.h> #include <linux/delay.h> #include <linux/overflow.h> #include "nvme.h" #include "fabrics.h" #include <linux/nvme-fc-driver.h> #include <linux/nvme-fc.h> /* *************************** Data Structures/Defines ****************** */ enum nvme_fc_queue_flags { NVME_FC_Q_CONNECTED = 0, NVME_FC_Q_LIVE, }; #define NVME_FC_DEFAULT_DEV_LOSS_TMO 60 /* seconds */ struct nvme_fc_queue { struct nvme_fc_ctrl *ctrl; struct device *dev; struct blk_mq_hw_ctx *hctx; void *lldd_handle; size_t cmnd_capsule_len; u32 qnum; u32 rqcnt; u32 seqno; u64 connection_id; atomic_t csn; unsigned long flags; } __aligned(sizeof(u64)); /* alignment for other things alloc'd with */ enum nvme_fcop_flags { FCOP_FLAGS_TERMIO = (1 << 0), FCOP_FLAGS_AEN = (1 << 1), }; struct nvmefc_ls_req_op { struct nvmefc_ls_req ls_req; struct nvme_fc_rport *rport; struct nvme_fc_queue *queue; struct request *rq; u32 flags; int ls_error; struct completion ls_done; struct list_head lsreq_list; /* rport->ls_req_list */ bool req_queued; }; enum nvme_fcpop_state { FCPOP_STATE_UNINIT = 0, FCPOP_STATE_IDLE = 1, FCPOP_STATE_ACTIVE = 2, FCPOP_STATE_ABORTED = 3, FCPOP_STATE_COMPLETE = 4, }; struct nvme_fc_fcp_op { struct nvme_request nreq; /* * nvme/host/core.c * requires this to be * the 1st element in the * private structure * associated with the * request. */ struct nvmefc_fcp_req fcp_req; struct nvme_fc_ctrl *ctrl; struct nvme_fc_queue *queue; struct request *rq; atomic_t state; u32 flags; u32 rqno; u32 nents; struct nvme_fc_cmd_iu cmd_iu; struct nvme_fc_ersp_iu rsp_iu; }; struct nvme_fcp_op_w_sgl { struct nvme_fc_fcp_op op; struct scatterlist sgl[SG_CHUNK_SIZE]; uint8_t priv[0]; }; struct nvme_fc_lport { struct nvme_fc_local_port localport; struct ida endp_cnt; struct list_head port_list; /* nvme_fc_port_list */ struct list_head endp_list; struct device *dev; /* physical device for dma */ struct nvme_fc_port_template *ops; struct kref ref; atomic_t act_rport_cnt; } __aligned(sizeof(u64)); /* alignment for other things alloc'd with */ struct nvme_fc_rport { struct nvme_fc_remote_port remoteport; struct list_head endp_list; /* for lport->endp_list */ struct list_head ctrl_list; struct list_head ls_req_list; struct list_head disc_list; struct device *dev; /* physical device for dma */ struct nvme_fc_lport *lport; spinlock_t lock; struct kref ref; atomic_t act_ctrl_cnt; unsigned long dev_loss_end; } __aligned(sizeof(u64)); /* alignment for other things alloc'd with */ enum nvme_fcctrl_flags { FCCTRL_TERMIO = (1 << 0), }; struct nvme_fc_ctrl { spinlock_t lock; struct nvme_fc_queue *queues; struct device *dev; struct nvme_fc_lport *lport; struct nvme_fc_rport *rport; u32 cnum; bool ioq_live; bool assoc_active; atomic_t err_work_active; u64 association_id; struct list_head ctrl_list; /* rport->ctrl_list */ struct blk_mq_tag_set admin_tag_set; struct blk_mq_tag_set tag_set; struct delayed_work connect_work; struct work_struct err_work; struct kref ref; u32 flags; u32 iocnt; wait_queue_head_t ioabort_wait; struct nvme_fc_fcp_op aen_ops[NVME_NR_AEN_COMMANDS]; struct nvme_ctrl ctrl; }; static inline struct nvme_fc_ctrl * to_fc_ctrl(struct nvme_ctrl *ctrl) { return container_of(ctrl, struct nvme_fc_ctrl, ctrl); } static inline struct nvme_fc_lport * localport_to_lport(struct nvme_fc_local_port *portptr) { return container_of(portptr, struct nvme_fc_lport, localport); } static inline struct nvme_fc_rport * remoteport_to_rport(struct nvme_fc_remote_port *portptr) { return container_of(portptr, struct nvme_fc_rport, remoteport); } static inline struct nvmefc_ls_req_op * ls_req_to_lsop(struct nvmefc_ls_req *lsreq) { return container_of(lsreq, struct nvmefc_ls_req_op, ls_req); } static inline struct nvme_fc_fcp_op * fcp_req_to_fcp_op(struct nvmefc_fcp_req *fcpreq) { return container_of(fcpreq, struct nvme_fc_fcp_op, fcp_req); } /* *************************** Globals **************************** */ static DEFINE_SPINLOCK(nvme_fc_lock); static LIST_HEAD(nvme_fc_lport_list); static DEFINE_IDA(nvme_fc_local_port_cnt); static DEFINE_IDA(nvme_fc_ctrl_cnt); /* * These items are short-term. They will eventually be moved into * a generic FC class. See comments in module init. */ static struct device *fc_udev_device; /* *********************** FC-NVME Port Management ************************ */ static void __nvme_fc_delete_hw_queue(struct nvme_fc_ctrl *, struct nvme_fc_queue *, unsigned int); static void nvme_fc_free_lport(struct kref *ref) { struct nvme_fc_lport *lport = container_of(ref, struct nvme_fc_lport, ref); unsigned long flags; WARN_ON(lport->localport.port_state != FC_OBJSTATE_DELETED); WARN_ON(!list_empty(&lport->endp_list)); /* remove from transport list */ spin_lock_irqsave(&nvme_fc_lock, flags); list_del(&lport->port_list); spin_unlock_irqrestore(&nvme_fc_lock, flags); ida_simple_remove(&nvme_fc_local_port_cnt, lport->localport.port_num); ida_destroy(&lport->endp_cnt); put_device(lport->dev); kfree(lport); } static void nvme_fc_lport_put(struct nvme_fc_lport *lport) { kref_put(&lport->ref, nvme_fc_free_lport); } static int nvme_fc_lport_get(struct nvme_fc_lport *lport) { return kref_get_unless_zero(&lport->ref); } static struct nvme_fc_lport * nvme_fc_attach_to_unreg_lport(struct nvme_fc_port_info *pinfo, struct nvme_fc_port_template *ops, struct device *dev) { struct nvme_fc_lport *lport; unsigned long flags; spin_lock_irqsave(&nvme_fc_lock, flags); list_for_each_entry(lport, &nvme_fc_lport_list, port_list) { if (lport->localport.node_name != pinfo->node_name || lport->localport.port_name != pinfo->port_name) continue; if (lport->dev != dev) { lport = ERR_PTR(-EXDEV); goto out_done; } if (lport->localport.port_state != FC_OBJSTATE_DELETED) { lport = ERR_PTR(-EEXIST); goto out_done; } if (!nvme_fc_lport_get(lport)) { /* * fails if ref cnt already 0. If so, * act as if lport already deleted */ lport = NULL; goto out_done; } /* resume the lport */ lport->ops = ops; lport->localport.port_role = pinfo->port_role; lport->localport.port_id = pinfo->port_id; lport->localport.port_state = FC_OBJSTATE_ONLINE; spin_unlock_irqrestore(&nvme_fc_lock, flags); return lport; } lport = NULL; out_done: spin_unlock_irqrestore(&nvme_fc_lock, flags); return lport; } /** * nvme_fc_register_localport - transport entry point called by an * LLDD to register the existence of a NVME * host FC port. * @pinfo: pointer to information about the port to be registered * @template: LLDD entrypoints and operational parameters for the port * @dev: physical hardware device node port corresponds to. Will be * used for DMA mappings * @portptr: pointer to a local port pointer. Upon success, the routine * will allocate a nvme_fc_local_port structure and place its * address in the local port pointer. Upon failure, local port * pointer will be set to 0. * * Returns: * a completion status. Must be 0 upon success; a negative errno * (ex: -ENXIO) upon failure. */ int nvme_fc_register_localport(struct nvme_fc_port_info *pinfo, struct nvme_fc_port_template *template, struct device *dev, struct nvme_fc_local_port **portptr) { struct nvme_fc_lport *newrec; unsigned long flags; int ret, idx; if (!template->localport_delete || !template->remoteport_delete || !template->ls_req || !template->fcp_io || !template->ls_abort || !template->fcp_abort || !template->max_hw_queues || !template->max_sgl_segments || !template->max_dif_sgl_segments || !template->dma_boundary) { ret = -EINVAL; goto out_reghost_failed; } /* * look to see if there is already a localport that had been * deregistered and in the process of waiting for all the * references to fully be removed. If the references haven't * expired, we can simply re-enable the localport. Remoteports * and controller reconnections should resume naturally. */ newrec = nvme_fc_attach_to_unreg_lport(pinfo, template, dev); /* found an lport, but something about its state is bad */ if (IS_ERR(newrec)) { ret = PTR_ERR(newrec); goto out_reghost_failed; /* found existing lport, which was resumed */ } else if (newrec) { *portptr = &newrec->localport; return 0; } /* nothing found - allocate a new localport struct */ newrec = kmalloc((sizeof(*newrec) + template->local_priv_sz), GFP_KERNEL); if (!newrec) { ret = -ENOMEM; goto out_reghost_failed; } idx = ida_simple_get(&nvme_fc_local_port_cnt, 0, 0, GFP_KERNEL); if (idx < 0) { ret = -ENOSPC; goto out_fail_kfree; } if (!get_device(dev) && dev) { ret = -ENODEV; goto out_ida_put; } INIT_LIST_HEAD(&newrec->port_list); INIT_LIST_HEAD(&newrec->endp_list); kref_init(&newrec->ref); atomic_set(&newrec->act_rport_cnt, 0); newrec->ops = template; newrec->dev = dev; ida_init(&newrec->endp_cnt); newrec->localport.private = &newrec[1]; newrec->localport.node_name = pinfo->node_name; newrec->localport.port_name = pinfo->port_name; newrec->localport.port_role = pinfo->port_role; newrec->localport.port_id = pinfo->port_id; newrec->localport.port_state = FC_OBJSTATE_ONLINE; newrec->localport.port_num = idx; spin_lock_irqsave(&nvme_fc_lock, flags); list_add_tail(&newrec->port_list, &nvme_fc_lport_list); spin_unlock_irqrestore(&nvme_fc_lock, flags); if (dev) dma_set_seg_boundary(dev, template->dma_boundary); *portptr = &newrec->localport; return 0; out_ida_put: ida_simple_remove(&nvme_fc_local_port_cnt, idx); out_fail_kfree: kfree(newrec); out_reghost_failed: *portptr = NULL; return ret; } EXPORT_SYMBOL_GPL(nvme_fc_register_localport); /** * nvme_fc_unregister_localport - transport entry point called by an * LLDD to deregister/remove a previously * registered a NVME host FC port. * @portptr: pointer to the (registered) local port that is to be deregistered. * * Returns: * a completion status. Must be 0 upon success; a negative errno * (ex: -ENXIO) upon failure. */ int nvme_fc_unregister_localport(struct nvme_fc_local_port *portptr) { struct nvme_fc_lport *lport = localport_to_lport(portptr); unsigned long flags; if (!portptr) return -EINVAL; spin_lock_irqsave(&nvme_fc_lock, flags); if (portptr->port_state != FC_OBJSTATE_ONLINE) { spin_unlock_irqrestore(&nvme_fc_lock, flags); return -EINVAL; } portptr->port_state = FC_OBJSTATE_DELETED; spin_unlock_irqrestore(&nvme_fc_lock, flags); if (atomic_read(&lport->act_rport_cnt) == 0) lport->ops->localport_delete(&lport->localport); nvme_fc_lport_put(lport); return 0; } EXPORT_SYMBOL_GPL(nvme_fc_unregister_localport); /* * TRADDR strings, per FC-NVME are fixed format: * "nn-0x<16hexdigits>:pn-0x<16hexdigits>" - 43 characters * udev event will only differ by prefix of what field is * being specified: * "NVMEFC_HOST_TRADDR=" or "NVMEFC_TRADDR=" - 19 max characters * 19 + 43 + null_fudge = 64 characters */ #define FCNVME_TRADDR_LENGTH 64 static void nvme_fc_signal_discovery_scan(struct nvme_fc_lport *lport, struct nvme_fc_rport *rport) { char hostaddr[FCNVME_TRADDR_LENGTH]; /* NVMEFC_HOST_TRADDR=...*/ char tgtaddr[FCNVME_TRADDR_LENGTH]; /* NVMEFC_TRADDR=...*/ char *envp[4] = { "FC_EVENT=nvmediscovery", hostaddr, tgtaddr, NULL }; if (!(rport->remoteport.port_role & FC_PORT_ROLE_NVME_DISCOVERY)) return; snprintf(hostaddr, sizeof(hostaddr), "NVMEFC_HOST_TRADDR=nn-0x%016llx:pn-0x%016llx", lport->localport.node_name, lport->localport.port_name); snprintf(tgtaddr, sizeof(tgtaddr), "NVMEFC_TRADDR=nn-0x%016llx:pn-0x%016llx", rport->remoteport.node_name, rport->remoteport.port_name); kobject_uevent_env(&fc_udev_device->kobj, KOBJ_CHANGE, envp); } static void nvme_fc_free_rport(struct kref *ref) { struct nvme_fc_rport *rport = container_of(ref, struct nvme_fc_rport, ref); struct nvme_fc_lport *lport = localport_to_lport(rport->remoteport.localport); unsigned long flags; WARN_ON(rport->remoteport.port_state != FC_OBJSTATE_DELETED); WARN_ON(!list_empty(&rport->ctrl_list)); /* remove from lport list */ spin_lock_irqsave(&nvme_fc_lock, flags); list_del(&rport->endp_list); spin_unlock_irqrestore(&nvme_fc_lock, flags); WARN_ON(!list_empty(&rport->disc_list)); ida_simple_remove(&lport->endp_cnt, rport->remoteport.port_num); kfree(rport); nvme_fc_lport_put(lport); } static void nvme_fc_rport_put(struct nvme_fc_rport *rport) { kref_put(&rport->ref, nvme_fc_free_rport); } static int nvme_fc_rport_get(struct nvme_fc_rport *rport) { return kref_get_unless_zero(&rport->ref); } static void nvme_fc_resume_controller(struct nvme_fc_ctrl *ctrl) { switch (ctrl->ctrl.state) { case NVME_CTRL_NEW: case NVME_CTRL_CONNECTING: /* * As all reconnects were suppressed, schedule a * connect. */ dev_info(ctrl->ctrl.device, "NVME-FC{%d}: connectivity re-established. " "Attempting reconnect\n", ctrl->cnum); queue_delayed_work(nvme_wq, &ctrl->connect_work, 0); break; case NVME_CTRL_RESETTING: /* * Controller is already in the process of terminating the * association. No need to do anything further. The reconnect * step will naturally occur after the reset completes. */ break; default: /* no action to take - let it delete */ break; } } static struct nvme_fc_rport * nvme_fc_attach_to_suspended_rport(struct nvme_fc_lport *lport, struct nvme_fc_port_info *pinfo) { struct nvme_fc_rport *rport; struct nvme_fc_ctrl *ctrl; unsigned long flags; spin_lock_irqsave(&nvme_fc_lock, flags); list_for_each_entry(rport, &lport->endp_list, endp_list) { if (rport->remoteport.node_name != pinfo->node_name || rport->remoteport.port_name != pinfo->port_name) continue; if (!nvme_fc_rport_get(rport)) { rport = ERR_PTR(-ENOLCK); goto out_done; } spin_unlock_irqrestore(&nvme_fc_lock, flags); spin_lock_irqsave(&rport->lock, flags); /* has it been unregistered */ if (rport->remoteport.port_state != FC_OBJSTATE_DELETED) { /* means lldd called us twice */ spin_unlock_irqrestore(&rport->lock, flags); nvme_fc_rport_put(rport); return ERR_PTR(-ESTALE); } rport->remoteport.port_role = pinfo->port_role; rport->remoteport.port_id = pinfo->port_id; rport->remoteport.port_state = FC_OBJSTATE_ONLINE; rport->dev_loss_end = 0; /* * kick off a reconnect attempt on all associations to the * remote port. A successful reconnects will resume i/o. */ list_for_each_entry(ctrl, &rport->ctrl_list, ctrl_list) nvme_fc_resume_controller(ctrl); spin_unlock_irqrestore(&rport->lock, flags); return rport; } rport = NULL; out_done: spin_unlock_irqrestore(&nvme_fc_lock, flags); return rport; } static inline void __nvme_fc_set_dev_loss_tmo(struct nvme_fc_rport *rport, struct nvme_fc_port_info *pinfo) { if (pinfo->dev_loss_tmo) rport->remoteport.dev_loss_tmo = pinfo->dev_loss_tmo; else rport->remoteport.dev_loss_tmo = NVME_FC_DEFAULT_DEV_LOSS_TMO; } /** * nvme_fc_register_remoteport - transport entry point called by an * LLDD to register the existence of a NVME * subsystem FC port on its fabric. * @localport: pointer to the (registered) local port that the remote * subsystem port is connected to. * @pinfo: pointer to information about the port to be registered * @portptr: pointer to a remote port pointer. Upon success, the routine * will allocate a nvme_fc_remote_port structure and place its * address in the remote port pointer. Upon failure, remote port * pointer will be set to 0. * * Returns: * a completion status. Must be 0 upon success; a negative errno * (ex: -ENXIO) upon failure. */ int nvme_fc_register_remoteport(struct nvme_fc_local_port *localport, struct nvme_fc_port_info *pinfo, struct nvme_fc_remote_port **portptr) { struct nvme_fc_lport *lport = localport_to_lport(localport); struct nvme_fc_rport *newrec; unsigned long flags; int ret, idx; if (!nvme_fc_lport_get(lport)) { ret = -ESHUTDOWN; goto out_reghost_failed; } /* * look to see if there is already a remoteport that is waiting * for a reconnect (within dev_loss_tmo) with the same WWN's. * If so, transition to it and reconnect. */ newrec = nvme_fc_attach_to_suspended_rport(lport, pinfo); /* found an rport, but something about its state is bad */ if (IS_ERR(newrec)) { ret = PTR_ERR(newrec); goto out_lport_put; /* found existing rport, which was resumed */ } else if (newrec) { nvme_fc_lport_put(lport); __nvme_fc_set_dev_loss_tmo(newrec, pinfo); nvme_fc_signal_discovery_scan(lport, newrec); *portptr = &newrec->remoteport; return 0; } /* nothing found - allocate a new remoteport struct */ newrec = kmalloc((sizeof(*newrec) + lport->ops->remote_priv_sz), GFP_KERNEL); if (!newrec) { ret = -ENOMEM; goto out_lport_put; } idx = ida_simple_get(&lport->endp_cnt, 0, 0, GFP_KERNEL); if (idx < 0) { ret = -ENOSPC; goto out_kfree_rport; } INIT_LIST_HEAD(&newrec->endp_list); INIT_LIST_HEAD(&newrec->ctrl_list); INIT_LIST_HEAD(&newrec->ls_req_list); INIT_LIST_HEAD(&newrec->disc_list); kref_init(&newrec->ref); atomic_set(&newrec->act_ctrl_cnt, 0); spin_lock_init(&newrec->lock); newrec->remoteport.localport = &lport->localport; newrec->dev = lport->dev; newrec->lport = lport; newrec->remoteport.private = &newrec[1]; newrec->remoteport.port_role = pinfo->port_role; newrec->remoteport.node_name = pinfo->node_name; newrec->remoteport.port_name = pinfo->port_name; newrec->remoteport.port_id = pinfo->port_id; newrec->remoteport.port_state = FC_OBJSTATE_ONLINE; newrec->remoteport.port_num = idx; __nvme_fc_set_dev_loss_tmo(newrec, pinfo); spin_lock_irqsave(&nvme_fc_lock, flags); list_add_tail(&newrec->endp_list, &lport->endp_list); spin_unlock_irqrestore(&nvme_fc_lock, flags); nvme_fc_signal_discovery_scan(lport, newrec); *portptr = &newrec->remoteport; return 0; out_kfree_rport: kfree(newrec); out_lport_put: nvme_fc_lport_put(lport); out_reghost_failed: *portptr = NULL; return ret; } EXPORT_SYMBOL_GPL(nvme_fc_register_remoteport); static int nvme_fc_abort_lsops(struct nvme_fc_rport *rport) { struct nvmefc_ls_req_op *lsop; unsigned long flags; restart: spin_lock_irqsave(&rport->lock, flags); list_for_each_entry(lsop, &rport->ls_req_list, lsreq_list) { if (!(lsop->flags & FCOP_FLAGS_TERMIO)) { lsop->flags |= FCOP_FLAGS_TERMIO; spin_unlock_irqrestore(&rport->lock, flags); rport->lport->ops->ls_abort(&rport->lport->localport, &rport->remoteport, &lsop->ls_req); goto restart; } } spin_unlock_irqrestore(&rport->lock, flags); return 0; } static void nvme_fc_ctrl_connectivity_loss(struct nvme_fc_ctrl *ctrl) { dev_info(ctrl->ctrl.device, "NVME-FC{%d}: controller connectivity lost. Awaiting " "Reconnect", ctrl->cnum); switch (ctrl->ctrl.state) { case NVME_CTRL_NEW: case NVME_CTRL_LIVE: /* * Schedule a controller reset. The reset will terminate the * association and schedule the reconnect timer. Reconnects * will be attempted until either the ctlr_loss_tmo * (max_retries * connect_delay) expires or the remoteport's * dev_loss_tmo expires. */ if (nvme_reset_ctrl(&ctrl->ctrl)) { dev_warn(ctrl->ctrl.device, "NVME-FC{%d}: Couldn't schedule reset.\n", ctrl->cnum); nvme_delete_ctrl(&ctrl->ctrl); } break; case NVME_CTRL_CONNECTING: /* * The association has already been terminated and the * controller is attempting reconnects. No need to do anything * futher. Reconnects will be attempted until either the * ctlr_loss_tmo (max_retries * connect_delay) expires or the * remoteport's dev_loss_tmo expires. */ break; case NVME_CTRL_RESETTING: /* * Controller is already in the process of terminating the * association. No need to do anything further. The reconnect * step will kick in naturally after the association is * terminated. */ break; case NVME_CTRL_DELETING: default: /* no action to take - let it delete */ break; } } /** * nvme_fc_unregister_remoteport - transport entry point called by an * LLDD to deregister/remove a previously * registered a NVME subsystem FC port. * @portptr: pointer to the (registered) remote port that is to be * deregistered. * * Returns: * a completion status. Must be 0 upon success; a negative errno * (ex: -ENXIO) upon failure. */ int nvme_fc_unregister_remoteport(struct nvme_fc_remote_port *portptr) { struct nvme_fc_rport *rport = remoteport_to_rport(portptr); struct nvme_fc_ctrl *ctrl; unsigned long flags; if (!portptr) return -EINVAL; spin_lock_irqsave(&rport->lock, flags); if (portptr->port_state != FC_OBJSTATE_ONLINE) { spin_unlock_irqrestore(&rport->lock, flags); return -EINVAL; } portptr->port_state = FC_OBJSTATE_DELETED; rport->dev_loss_end = jiffies + (portptr->dev_loss_tmo * HZ); list_for_each_entry(ctrl, &rport->ctrl_list, ctrl_list) { /* if dev_loss_tmo==0, dev loss is immediate */ if (!portptr->dev_loss_tmo) { dev_warn(ctrl->ctrl.device, "NVME-FC{%d}: controller connectivity lost.\n", ctrl->cnum); nvme_delete_ctrl(&ctrl->ctrl); } else nvme_fc_ctrl_connectivity_loss(ctrl); } spin_unlock_irqrestore(&rport->lock, flags); nvme_fc_abort_lsops(rport); if (atomic_read(&rport->act_ctrl_cnt) == 0) rport->lport->ops->remoteport_delete(portptr); /* * release the reference, which will allow, if all controllers * go away, which should only occur after dev_loss_tmo occurs, * for the rport to be torn down. */ nvme_fc_rport_put(rport); return 0; } EXPORT_SYMBOL_GPL(nvme_fc_unregister_remoteport); /** * nvme_fc_rescan_remoteport - transport entry point called by an * LLDD to request a nvme device rescan. * @remoteport: pointer to the (registered) remote port that is to be * rescanned. * * Returns: N/A */ void nvme_fc_rescan_remoteport(struct nvme_fc_remote_port *remoteport) { struct nvme_fc_rport *rport = remoteport_to_rport(remoteport); nvme_fc_signal_discovery_scan(rport->lport, rport); } EXPORT_SYMBOL_GPL(nvme_fc_rescan_remoteport); int nvme_fc_set_remoteport_devloss(struct nvme_fc_remote_port *portptr, u32 dev_loss_tmo) { struct nvme_fc_rport *rport = remoteport_to_rport(portptr); unsigned long flags; spin_lock_irqsave(&rport->lock, flags); if (portptr->port_state != FC_OBJSTATE_ONLINE) { spin_unlock_irqrestore(&rport->lock, flags); return -EINVAL; } /* a dev_loss_tmo of 0 (immediate) is allowed to be set */ rport->remoteport.dev_loss_tmo = dev_loss_tmo; spin_unlock_irqrestore(&rport->lock, flags); return 0; } EXPORT_SYMBOL_GPL(nvme_fc_set_remoteport_devloss); /* *********************** FC-NVME DMA Handling **************************** */ /* * The fcloop device passes in a NULL device pointer. Real LLD's will * pass in a valid device pointer. If NULL is passed to the dma mapping * routines, depending on the platform, it may or may not succeed, and * may crash. * * As such: * Wrapper all the dma routines and check the dev pointer. * * If simple mappings (return just a dma address, we'll noop them, * returning a dma address of 0. * * On more complex mappings (dma_map_sg), a pseudo routine fills * in the scatter list, setting all dma addresses to 0. */ static inline dma_addr_t fc_dma_map_single(struct device *dev, void *ptr, size_t size, enum dma_data_direction dir) { return dev ? dma_map_single(dev, ptr, size, dir) : (dma_addr_t)0L; } static inline int fc_dma_mapping_error(struct device *dev, dma_addr_t dma_addr) { return dev ? dma_mapping_error(dev, dma_addr) : 0; } static inline void fc_dma_unmap_single(struct device *dev, dma_addr_t addr, size_t size, enum dma_data_direction dir) { if (dev) dma_unmap_single(dev, addr, size, dir); } static inline void fc_dma_sync_single_for_cpu(struct device *dev, dma_addr_t addr, size_t size, enum dma_data_direction dir) { if (dev) dma_sync_single_for_cpu(dev, addr, size, dir); } static inline void fc_dma_sync_single_for_device(struct device *dev, dma_addr_t addr, size_t size, enum dma_data_direction dir) { if (dev) dma_sync_single_for_device(dev, addr, size, dir); } /* pseudo dma_map_sg call */ static int fc_map_sg(struct scatterlist *sg, int nents) { struct scatterlist *s; int i; WARN_ON(nents == 0 || sg[0].length == 0); for_each_sg(sg, s, nents, i) { s->dma_address = 0L; #ifdef CONFIG_NEED_SG_DMA_LENGTH s->dma_length = s->length; #endif } return nents; } static inline int fc_dma_map_sg(struct device *dev, struct scatterlist *sg, int nents, enum dma_data_direction dir) { return dev ? dma_map_sg(dev, sg, nents, dir) : fc_map_sg(sg, nents); } static inline void fc_dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nents, enum dma_data_direction dir) { if (dev) dma_unmap_sg(dev, sg, nents, dir); } /* *********************** FC-NVME LS Handling **************************** */ static void nvme_fc_ctrl_put(struct nvme_fc_ctrl *); static int nvme_fc_ctrl_get(struct nvme_fc_ctrl *); static void __nvme_fc_finish_ls_req(struct nvmefc_ls_req_op *lsop) { struct nvme_fc_rport *rport = lsop->rport; struct nvmefc_ls_req *lsreq = &lsop->ls_req; unsigned long flags; spin_lock_irqsave(&rport->lock, flags); if (!lsop->req_queued) { spin_unlock_irqrestore(&rport->lock, flags); return; } list_del(&lsop->lsreq_list); lsop->req_queued = false; spin_unlock_irqrestore(&rport->lock, flags); fc_dma_unmap_single(rport->dev, lsreq->rqstdma, (lsreq->rqstlen + lsreq->rsplen), DMA_BIDIRECTIONAL); nvme_fc_rport_put(rport); } static int __nvme_fc_send_ls_req(struct nvme_fc_rport *rport, struct nvmefc_ls_req_op *lsop, void (*done)(struct nvmefc_ls_req *req, int status)) { struct nvmefc_ls_req *lsreq = &lsop->ls_req; unsigned long flags; int ret = 0; if (rport->remoteport.port_state != FC_OBJSTATE_ONLINE) return -ECONNREFUSED; if (!nvme_fc_rport_get(rport)) return -ESHUTDOWN; lsreq->done = done; lsop->rport = rport; lsop->req_queued = false; INIT_LIST_HEAD(&lsop->lsreq_list); init_completion(&lsop->ls_done); lsreq->rqstdma = fc_dma_map_single(rport->dev, lsreq->rqstaddr, lsreq->rqstlen + lsreq->rsplen, DMA_BIDIRECTIONAL); if (fc_dma_mapping_error(rport->dev, lsreq->rqstdma)) { ret = -EFAULT; goto out_putrport; } lsreq->rspdma = lsreq->rqstdma + lsreq->rqstlen; spin_lock_irqsave(&rport->lock, flags); list_add_tail(&lsop->lsreq_list, &rport->ls_req_list); lsop->req_queued = true; spin_unlock_irqrestore(&rport->lock, flags); ret = rport->lport->ops->ls_req(&rport->lport->localport, &rport->remoteport, lsreq); if (ret) goto out_unlink; return 0; out_unlink: lsop->ls_error = ret; spin_lock_irqsave(&rport->lock, flags); lsop->req_queued = false; list_del(&lsop->lsreq_list); spin_unlock_irqrestore(&rport->lock, flags); fc_dma_unmap_single(rport->dev, lsreq->rqstdma, (lsreq->rqstlen + lsreq->rsplen), DMA_BIDIRECTIONAL); out_putrport: nvme_fc_rport_put(rport); return ret; } static void nvme_fc_send_ls_req_done(struct nvmefc_ls_req *lsreq, int status) { struct nvmefc_ls_req_op *lsop = ls_req_to_lsop(lsreq); lsop->ls_error = status; complete(&lsop->ls_done); } static int nvme_fc_send_ls_req(struct nvme_fc_rport *rport, struct nvmefc_ls_req_op *lsop) { struct nvmefc_ls_req *lsreq = &lsop->ls_req; struct fcnvme_ls_rjt *rjt = lsreq->rspaddr; int ret; ret = __nvme_fc_send_ls_req(rport, lsop, nvme_fc_send_ls_req_done); if (!ret) { /* * No timeout/not interruptible as we need the struct * to exist until the lldd calls us back. Thus mandate * wait until driver calls back. lldd responsible for * the timeout action */ wait_for_completion(&lsop->ls_done); __nvme_fc_finish_ls_req(lsop); ret = lsop->ls_error; } if (ret) return ret; /* ACC or RJT payload ? */ if (rjt->w0.ls_cmd == FCNVME_LS_RJT) return -ENXIO; return 0; } static int nvme_fc_send_ls_req_async(struct nvme_fc_rport *rport, struct nvmefc_ls_req_op *lsop, void (*done)(struct nvmefc_ls_req *req, int status)) { /* don't wait for completion */ return __nvme_fc_send_ls_req(rport, lsop, done); } /* Validation Error indexes into the string table below */ enum { VERR_NO_ERROR = 0, VERR_LSACC = 1, VERR_LSDESC_RQST = 2, VERR_LSDESC_RQST_LEN = 3, VERR_ASSOC_ID = 4, VERR_ASSOC_ID_LEN = 5, VERR_CONN_ID = 6, VERR_CONN_ID_LEN = 7, VERR_CR_ASSOC = 8, VERR_CR_ASSOC_ACC_LEN = 9, VERR_CR_CONN = 10, VERR_CR_CONN_ACC_LEN = 11, VERR_DISCONN = 12, VERR_DISCONN_ACC_LEN = 13, }; static char *validation_errors[] = { "OK", "Not LS_ACC", "Not LSDESC_RQST", "Bad LSDESC_RQST Length", "Not Association ID", "Bad Association ID Length", "Not Connection ID", "Bad Connection ID Length", "Not CR_ASSOC Rqst", "Bad CR_ASSOC ACC Length", "Not CR_CONN Rqst", "Bad CR_CONN ACC Length", "Not Disconnect Rqst", "Bad Disconnect ACC Length", }; static int nvme_fc_connect_admin_queue(struct nvme_fc_ctrl *ctrl, struct nvme_fc_queue *queue, u16 qsize, u16 ersp_ratio) { struct nvmefc_ls_req_op *lsop; struct nvmefc_ls_req *lsreq; struct fcnvme_ls_cr_assoc_rqst *assoc_rqst; struct fcnvme_ls_cr_assoc_acc *assoc_acc; int ret, fcret = 0; lsop = kzalloc((sizeof(*lsop) + ctrl->lport->ops->lsrqst_priv_sz + sizeof(*assoc_rqst) + sizeof(*assoc_acc)), GFP_KERNEL); if (!lsop) { ret = -ENOMEM; goto out_no_memory; } lsreq = &lsop->ls_req; lsreq->private = (void *)&lsop[1]; assoc_rqst = (struct fcnvme_ls_cr_assoc_rqst *) (lsreq->private + ctrl->lport->ops->lsrqst_priv_sz); assoc_acc = (struct fcnvme_ls_cr_assoc_acc *)&assoc_rqst[1]; assoc_rqst->w0.ls_cmd = FCNVME_LS_CREATE_ASSOCIATION; assoc_rqst->desc_list_len = cpu_to_be32(sizeof(struct fcnvme_lsdesc_cr_assoc_cmd)); assoc_rqst->assoc_cmd.desc_tag = cpu_to_be32(FCNVME_LSDESC_CREATE_ASSOC_CMD); assoc_rqst->assoc_cmd.desc_len = fcnvme_lsdesc_len( sizeof(struct fcnvme_lsdesc_cr_assoc_cmd)); assoc_rqst->assoc_cmd.ersp_ratio = cpu_to_be16(ersp_ratio); assoc_rqst->assoc_cmd.sqsize = cpu_to_be16(qsize - 1); /* Linux supports only Dynamic controllers */ assoc_rqst->assoc_cmd.cntlid = cpu_to_be16(0xffff); uuid_copy(&assoc_rqst->assoc_cmd.hostid, &ctrl->ctrl.opts->host->id); strncpy(assoc_rqst->assoc_cmd.hostnqn, ctrl->ctrl.opts->host->nqn, min(FCNVME_ASSOC_HOSTNQN_LEN, NVMF_NQN_SIZE)); strncpy(assoc_rqst->assoc_cmd.subnqn, ctrl->ctrl.opts->subsysnqn, min(FCNVME_ASSOC_SUBNQN_LEN, NVMF_NQN_SIZE)); lsop->queue = queue; lsreq->rqstaddr = assoc_rqst; lsreq->rqstlen = sizeof(*assoc_rqst); lsreq->rspaddr = assoc_acc; lsreq->rsplen = sizeof(*assoc_acc); lsreq->timeout = NVME_FC_CONNECT_TIMEOUT_SEC; ret = nvme_fc_send_ls_req(ctrl->rport, lsop); if (ret) goto out_free_buffer; /* process connect LS completion */ /* validate the ACC response */ if (assoc_acc->hdr.w0.ls_cmd != FCNVME_LS_ACC) fcret = VERR_LSACC; else if (assoc_acc->hdr.desc_list_len != fcnvme_lsdesc_len( sizeof(struct fcnvme_ls_cr_assoc_acc))) fcret = VERR_CR_ASSOC_ACC_LEN; else if (assoc_acc->hdr.rqst.desc_tag != cpu_to_be32(FCNVME_LSDESC_RQST)) fcret = VERR_LSDESC_RQST; else if (assoc_acc->hdr.rqst.desc_len != fcnvme_lsdesc_len(sizeof(struct fcnvme_lsdesc_rqst))) fcret = VERR_LSDESC_RQST_LEN; else if (assoc_acc->hdr.rqst.w0.ls_cmd != FCNVME_LS_CREATE_ASSOCIATION) fcret = VERR_CR_ASSOC; else if (assoc_acc->associd.desc_tag != cpu_to_be32(FCNVME_LSDESC_ASSOC_ID)) fcret = VERR_ASSOC_ID; else if (assoc_acc->associd.desc_len != fcnvme_lsdesc_len( sizeof(struct fcnvme_lsdesc_assoc_id))) fcret = VERR_ASSOC_ID_LEN; else if (assoc_acc->connectid.desc_tag != cpu_to_be32(FCNVME_LSDESC_CONN_ID)) fcret = VERR_CONN_ID; else if (assoc_acc->connectid.desc_len != fcnvme_lsdesc_len(sizeof(struct fcnvme_lsdesc_conn_id))) fcret = VERR_CONN_ID_LEN; if (fcret) { ret = -EBADF; dev_err(ctrl->dev, "q %d connect failed: %s\n", queue->qnum, validation_errors[fcret]); } else { ctrl->association_id = be64_to_cpu(assoc_acc->associd.association_id); queue->connection_id = be64_to_cpu(assoc_acc->connectid.connection_id); set_bit(NVME_FC_Q_CONNECTED, &queue->flags); } out_free_buffer: kfree(lsop); out_no_memory: if (ret) dev_err(ctrl->dev, "queue %d connect admin queue failed (%d).\n", queue->qnum, ret); return ret; } static int nvme_fc_connect_queue(struct nvme_fc_ctrl *ctrl, struct nvme_fc_queue *queue, u16 qsize, u16 ersp_ratio) { struct nvmefc_ls_req_op *lsop; struct nvmefc_ls_req *lsreq; struct fcnvme_ls_cr_conn_rqst *conn_rqst; struct fcnvme_ls_cr_conn_acc *conn_acc; int ret, fcret = 0; lsop = kzalloc((sizeof(*lsop) + ctrl->lport->ops->lsrqst_priv_sz + sizeof(*conn_rqst) + sizeof(*conn_acc)), GFP_KERNEL); if (!lsop) { ret = -ENOMEM; goto out_no_memory; } lsreq = &lsop->ls_req; lsreq->private = (void *)&lsop[1]; conn_rqst = (struct fcnvme_ls_cr_conn_rqst *) (lsreq->private + ctrl->lport->ops->lsrqst_priv_sz); conn_acc = (struct fcnvme_ls_cr_conn_acc *)&conn_rqst[1]; conn_rqst->w0.ls_cmd = FCNVME_LS_CREATE_CONNECTION; conn_rqst->desc_list_len = cpu_to_be32( sizeof(struct fcnvme_lsdesc_assoc_id) + sizeof(struct fcnvme_lsdesc_cr_conn_cmd)); conn_rqst->associd.desc_tag = cpu_to_be32(FCNVME_LSDESC_ASSOC_ID); conn_rqst->associd.desc_len = fcnvme_lsdesc_len( sizeof(struct fcnvme_lsdesc_assoc_id)); conn_rqst->associd.association_id = cpu_to_be64(ctrl->association_id); conn_rqst->connect_cmd.desc_tag = cpu_to_be32(FCNVME_LSDESC_CREATE_CONN_CMD); conn_rqst->connect_cmd.desc_len = fcnvme_lsdesc_len( sizeof(struct fcnvme_lsdesc_cr_conn_cmd)); conn_rqst->connect_cmd.ersp_ratio = cpu_to_be16(ersp_ratio); conn_rqst->connect_cmd.qid = cpu_to_be16(queue->qnum); conn_rqst->connect_cmd.sqsize = cpu_to_be16(qsize - 1); lsop->queue = queue; lsreq->rqstaddr = conn_rqst; lsreq->rqstlen = sizeof(*conn_rqst); lsreq->rspaddr = conn_acc; lsreq->rsplen = sizeof(*conn_acc); lsreq->timeout = NVME_FC_CONNECT_TIMEOUT_SEC; ret = nvme_fc_send_ls_req(ctrl->rport, lsop); if (ret) goto out_free_buffer; /* process connect LS completion */ /* validate the ACC response */ if (conn_acc->hdr.w0.ls_cmd != FCNVME_LS_ACC) fcret = VERR_LSACC; else if (conn_acc->hdr.desc_list_len != fcnvme_lsdesc_len(sizeof(struct fcnvme_ls_cr_conn_acc))) fcret = VERR_CR_CONN_ACC_LEN; else if (conn_acc->hdr.rqst.desc_tag != cpu_to_be32(FCNVME_LSDESC_RQST)) fcret = VERR_LSDESC_RQST; else if (conn_acc->hdr.rqst.desc_len != fcnvme_lsdesc_len(sizeof(struct fcnvme_lsdesc_rqst))) fcret = VERR_LSDESC_RQST_LEN; else if (conn_acc->hdr.rqst.w0.ls_cmd != FCNVME_LS_CREATE_CONNECTION) fcret = VERR_CR_CONN; else if (conn_acc->connectid.desc_tag != cpu_to_be32(FCNVME_LSDESC_CONN_ID)) fcret = VERR_CONN_ID; else if (conn_acc->connectid.desc_len != fcnvme_lsdesc_len(sizeof(struct fcnvme_lsdesc_conn_id))) fcret = VERR_CONN_ID_LEN; if (fcret) { ret = -EBADF; dev_err(ctrl->dev, "q %d connect failed: %s\n", queue->qnum, validation_errors[fcret]); } else { queue->connection_id = be64_to_cpu(conn_acc->connectid.connection_id); set_bit(NVME_FC_Q_CONNECTED, &queue->flags); } out_free_buffer: kfree(lsop); out_no_memory: if (ret) dev_err(ctrl->dev, "queue %d connect command failed (%d).\n", queue->qnum, ret); return ret; } static void nvme_fc_disconnect_assoc_done(struct nvmefc_ls_req *lsreq, int status) { struct nvmefc_ls_req_op *lsop = ls_req_to_lsop(lsreq); __nvme_fc_finish_ls_req(lsop); /* fc-nvme initiator doesn't care about success or failure of cmd */ kfree(lsop); } /* * This routine sends a FC-NVME LS to disconnect (aka terminate) * the FC-NVME Association. Terminating the association also * terminates the FC-NVME connections (per queue, both admin and io * queues) that are part of the association. E.g. things are torn * down, and the related FC-NVME Association ID and Connection IDs * become invalid. * * The behavior of the fc-nvme initiator is such that it's * understanding of the association and connections will implicitly * be torn down. The action is implicit as it may be due to a loss of * connectivity with the fc-nvme target, so you may never get a * response even if you tried. As such, the action of this routine * is to asynchronously send the LS, ignore any results of the LS, and * continue on with terminating the association. If the fc-nvme target * is present and receives the LS, it too can tear down. */ static void nvme_fc_xmt_disconnect_assoc(struct nvme_fc_ctrl *ctrl) { struct fcnvme_ls_disconnect_rqst *discon_rqst; struct fcnvme_ls_disconnect_acc *discon_acc; struct nvmefc_ls_req_op *lsop; struct nvmefc_ls_req *lsreq; int ret; lsop = kzalloc((sizeof(*lsop) + ctrl->lport->ops->lsrqst_priv_sz + sizeof(*discon_rqst) + sizeof(*discon_acc)), GFP_KERNEL); if (!lsop) /* couldn't sent it... too bad */ return; lsreq = &lsop->ls_req; lsreq->private = (void *)&lsop[1]; discon_rqst = (struct fcnvme_ls_disconnect_rqst *) (lsreq->private + ctrl->lport->ops->lsrqst_priv_sz); discon_acc = (struct fcnvme_ls_disconnect_acc *)&discon_rqst[1]; discon_rqst->w0.ls_cmd = FCNVME_LS_DISCONNECT; discon_rqst->desc_list_len = cpu_to_be32( sizeof(struct fcnvme_lsdesc_assoc_id) + sizeof(struct fcnvme_lsdesc_disconn_cmd)); discon_rqst->associd.desc_tag = cpu_to_be32(FCNVME_LSDESC_ASSOC_ID); discon_rqst->associd.desc_len = fcnvme_lsdesc_len( sizeof(struct fcnvme_lsdesc_assoc_id)); discon_rqst->associd.association_id = cpu_to_be64(ctrl->association_id); discon_rqst->discon_cmd.desc_tag = cpu_to_be32( FCNVME_LSDESC_DISCONN_CMD); discon_rqst->discon_cmd.desc_len = fcnvme_lsdesc_len( sizeof(struct fcnvme_lsdesc_disconn_cmd)); discon_rqst->discon_cmd.scope = FCNVME_DISCONN_ASSOCIATION; discon_rqst->discon_cmd.id = cpu_to_be64(ctrl->association_id); lsreq->rqstaddr = discon_rqst; lsreq->rqstlen = sizeof(*discon_rqst); lsreq->rspaddr = discon_acc; lsreq->rsplen = sizeof(*discon_acc); lsreq->timeout = NVME_FC_CONNECT_TIMEOUT_SEC; ret = nvme_fc_send_ls_req_async(ctrl->rport, lsop, nvme_fc_disconnect_assoc_done); if (ret) kfree(lsop); /* only meaningful part to terminating the association */ ctrl->association_id = 0; } /* *********************** NVME Ctrl Routines **************************** */ static void nvme_fc_error_recovery(struct nvme_fc_ctrl *ctrl, char *errmsg); static void __nvme_fc_exit_request(struct nvme_fc_ctrl *ctrl, struct nvme_fc_fcp_op *op) { fc_dma_unmap_single(ctrl->lport->dev, op->fcp_req.rspdma, sizeof(op->rsp_iu), DMA_FROM_DEVICE); fc_dma_unmap_single(ctrl->lport->dev, op->fcp_req.cmddma, sizeof(op->cmd_iu), DMA_TO_DEVICE); atomic_set(&op->state, FCPOP_STATE_UNINIT); } static void nvme_fc_exit_request(struct blk_mq_tag_set *set, struct request *rq, unsigned int hctx_idx) { struct nvme_fc_fcp_op *op = blk_mq_rq_to_pdu(rq); return __nvme_fc_exit_request(set->driver_data, op); } static int __nvme_fc_abort_op(struct nvme_fc_ctrl *ctrl, struct nvme_fc_fcp_op *op) { unsigned long flags; int opstate; spin_lock_irqsave(&ctrl->lock, flags); opstate = atomic_xchg(&op->state, FCPOP_STATE_ABORTED); if (opstate != FCPOP_STATE_ACTIVE) atomic_set(&op->state, opstate); else if (ctrl->flags & FCCTRL_TERMIO) ctrl->iocnt++; spin_unlock_irqrestore(&ctrl->lock, flags); if (opstate != FCPOP_STATE_ACTIVE) return -ECANCELED; ctrl->lport->ops->fcp_abort(&ctrl->lport->localport, &ctrl->rport->remoteport, op->queue->lldd_handle, &op->fcp_req); return 0; } static void nvme_fc_abort_aen_ops(struct nvme_fc_ctrl *ctrl) { struct nvme_fc_fcp_op *aen_op = ctrl->aen_ops; int i; /* ensure we've initialized the ops once */ if (!(aen_op->flags & FCOP_FLAGS_AEN)) return; for (i = 0; i < NVME_NR_AEN_COMMANDS; i++, aen_op++) __nvme_fc_abort_op(ctrl, aen_op); } static inline void __nvme_fc_fcpop_chk_teardowns(struct nvme_fc_ctrl *ctrl, struct nvme_fc_fcp_op *op, int opstate) { unsigned long flags; if (opstate == FCPOP_STATE_ABORTED) { spin_lock_irqsave(&ctrl->lock, flags); if (ctrl->flags & FCCTRL_TERMIO) { if (!--ctrl->iocnt) wake_up(&ctrl->ioabort_wait); } spin_unlock_irqrestore(&ctrl->lock, flags); } } static void nvme_fc_fcpio_done(struct nvmefc_fcp_req *req) { struct nvme_fc_fcp_op *op = fcp_req_to_fcp_op(req); struct request *rq = op->rq; struct nvmefc_fcp_req *freq = &op->fcp_req; struct nvme_fc_ctrl *ctrl = op->ctrl; struct nvme_fc_queue *queue = op->queue; struct nvme_completion *cqe = &op->rsp_iu.cqe; struct nvme_command *sqe = &op->cmd_iu.sqe; __le16 status = cpu_to_le16(NVME_SC_SUCCESS << 1); union nvme_result result; bool terminate_assoc = true; int opstate; /* * WARNING: * The current linux implementation of a nvme controller * allocates a single tag set for all io queues and sizes * the io queues to fully hold all possible tags. Thus, the * implementation does not reference or care about the sqhd * value as it never needs to use the sqhd/sqtail pointers * for submission pacing. * * This affects the FC-NVME implementation in two ways: * 1) As the value doesn't matter, we don't need to waste * cycles extracting it from ERSPs and stamping it in the * cases where the transport fabricates CQEs on successful * completions. * 2) The FC-NVME implementation requires that delivery of * ERSP completions are to go back to the nvme layer in order * relative to the rsn, such that the sqhd value will always * be "in order" for the nvme layer. As the nvme layer in * linux doesn't care about sqhd, there's no need to return * them in order. * * Additionally: * As the core nvme layer in linux currently does not look at * every field in the cqe - in cases where the FC transport must * fabricate a CQE, the following fields will not be set as they * are not referenced: * cqe.sqid, cqe.sqhd, cqe.command_id * * Failure or error of an individual i/o, in a transport * detected fashion unrelated to the nvme completion status, * potentially cause the initiator and target sides to get out * of sync on SQ head/tail (aka outstanding io count allowed). * Per FC-NVME spec, failure of an individual command requires * the connection to be terminated, which in turn requires the * association to be terminated. */ opstate = atomic_xchg(&op->state, FCPOP_STATE_COMPLETE); fc_dma_sync_single_for_cpu(ctrl->lport->dev, op->fcp_req.rspdma, sizeof(op->rsp_iu), DMA_FROM_DEVICE); if (opstate == FCPOP_STATE_ABORTED) status = cpu_to_le16(NVME_SC_ABORT_REQ << 1); else if (freq->status) status = cpu_to_le16(NVME_SC_INTERNAL << 1); /* * For the linux implementation, if we have an unsuccesful * status, they blk-mq layer can typically be called with the * non-zero status and the content of the cqe isn't important. */ if (status) goto done; /* * command completed successfully relative to the wire * protocol. However, validate anything received and * extract the status and result from the cqe (create it * where necessary). */ switch (freq->rcv_rsplen) { case 0: case NVME_FC_SIZEOF_ZEROS_RSP: /* * No response payload or 12 bytes of payload (which * should all be zeros) are considered successful and * no payload in the CQE by the transport. */ if (freq->transferred_length != be32_to_cpu(op->cmd_iu.data_len)) { status = cpu_to_le16(NVME_SC_INTERNAL << 1); goto done; } result.u64 = 0; break; case sizeof(struct nvme_fc_ersp_iu): /* * The ERSP IU contains a full completion with CQE. * Validate ERSP IU and look at cqe. */ if (unlikely(be16_to_cpu(op->rsp_iu.iu_len) != (freq->rcv_rsplen / 4) || be32_to_cpu(op->rsp_iu.xfrd_len) != freq->transferred_length || op->rsp_iu.status_code || sqe->common.command_id != cqe->command_id)) { status = cpu_to_le16(NVME_SC_INTERNAL << 1); goto done; } result = cqe->result; status = cqe->status; break; default: status = cpu_to_le16(NVME_SC_INTERNAL << 1); goto done; } terminate_assoc = false; done: if (op->flags & FCOP_FLAGS_AEN) { nvme_complete_async_event(&queue->ctrl->ctrl, status, &result); __nvme_fc_fcpop_chk_teardowns(ctrl, op, opstate); atomic_set(&op->state, FCPOP_STATE_IDLE); op->flags = FCOP_FLAGS_AEN; /* clear other flags */ nvme_fc_ctrl_put(ctrl); goto check_error; } __nvme_fc_fcpop_chk_teardowns(ctrl, op, opstate); nvme_end_request(rq, status, result); check_error: if (terminate_assoc) nvme_fc_error_recovery(ctrl, "transport detected io error"); } static int __nvme_fc_init_request(struct nvme_fc_ctrl *ctrl, struct nvme_fc_queue *queue, struct nvme_fc_fcp_op *op, struct request *rq, u32 rqno) { struct nvme_fcp_op_w_sgl *op_w_sgl = container_of(op, typeof(*op_w_sgl), op); struct nvme_fc_cmd_iu *cmdiu = &op->cmd_iu; int ret = 0; memset(op, 0, sizeof(*op)); op->fcp_req.cmdaddr = &op->cmd_iu; op->fcp_req.cmdlen = sizeof(op->cmd_iu); op->fcp_req.rspaddr = &op->rsp_iu; op->fcp_req.rsplen = sizeof(op->rsp_iu); op->fcp_req.done = nvme_fc_fcpio_done; op->ctrl = ctrl; op->queue = queue; op->rq = rq; op->rqno = rqno; cmdiu->scsi_id = NVME_CMD_SCSI_ID; cmdiu->fc_id = NVME_CMD_FC_ID; cmdiu->iu_len = cpu_to_be16(sizeof(*cmdiu) / sizeof(u32)); op->fcp_req.cmddma = fc_dma_map_single(ctrl->lport->dev, &op->cmd_iu, sizeof(op->cmd_iu), DMA_TO_DEVICE); if (fc_dma_mapping_error(ctrl->lport->dev, op->fcp_req.cmddma)) { dev_err(ctrl->dev, "FCP Op failed - cmdiu dma mapping failed.\n"); ret = EFAULT; goto out_on_error; } op->fcp_req.rspdma = fc_dma_map_single(ctrl->lport->dev, &op->rsp_iu, sizeof(op->rsp_iu), DMA_FROM_DEVICE); if (fc_dma_mapping_error(ctrl->lport->dev, op->fcp_req.rspdma)) { dev_err(ctrl->dev, "FCP Op failed - rspiu dma mapping failed.\n"); ret = EFAULT; } atomic_set(&op->state, FCPOP_STATE_IDLE); out_on_error: return ret; } static int nvme_fc_init_request(struct blk_mq_tag_set *set, struct request *rq, unsigned int hctx_idx, unsigned int numa_node) { struct nvme_fc_ctrl *ctrl = set->driver_data; struct nvme_fcp_op_w_sgl *op = blk_mq_rq_to_pdu(rq); int queue_idx = (set == &ctrl->tag_set) ? hctx_idx + 1 : 0; struct nvme_fc_queue *queue = &ctrl->queues[queue_idx]; int res; res = __nvme_fc_init_request(ctrl, queue, &op->op, rq, queue->rqcnt++); if (res) return res; op->op.fcp_req.first_sgl = &op->sgl[0]; op->op.fcp_req.private = &op->priv[0]; nvme_req(rq)->ctrl = &ctrl->ctrl; return res; } static int nvme_fc_init_aen_ops(struct nvme_fc_ctrl *ctrl) { struct nvme_fc_fcp_op *aen_op; struct nvme_fc_cmd_iu *cmdiu; struct nvme_command *sqe; void *private; int i, ret; aen_op = ctrl->aen_ops; for (i = 0; i < NVME_NR_AEN_COMMANDS; i++, aen_op++) { private = kzalloc(ctrl->lport->ops->fcprqst_priv_sz, GFP_KERNEL); if (!private) return -ENOMEM; cmdiu = &aen_op->cmd_iu; sqe = &cmdiu->sqe; ret = __nvme_fc_init_request(ctrl, &ctrl->queues[0], aen_op, (struct request *)NULL, (NVME_AQ_BLK_MQ_DEPTH + i)); if (ret) { kfree(private); return ret; } aen_op->flags = FCOP_FLAGS_AEN; aen_op->fcp_req.private = private; memset(sqe, 0, sizeof(*sqe)); sqe->common.opcode = nvme_admin_async_event; /* Note: core layer may overwrite the sqe.command_id value */ sqe->common.command_id = NVME_AQ_BLK_MQ_DEPTH + i; } return 0; } static void nvme_fc_term_aen_ops(struct nvme_fc_ctrl *ctrl) { struct nvme_fc_fcp_op *aen_op; int i; aen_op = ctrl->aen_ops; for (i = 0; i < NVME_NR_AEN_COMMANDS; i++, aen_op++) { if (!aen_op->fcp_req.private) continue; __nvme_fc_exit_request(ctrl, aen_op); kfree(aen_op->fcp_req.private); aen_op->fcp_req.private = NULL; } } static inline void __nvme_fc_init_hctx(struct blk_mq_hw_ctx *hctx, struct nvme_fc_ctrl *ctrl, unsigned int qidx) { struct nvme_fc_queue *queue = &ctrl->queues[qidx]; hctx->driver_data = queue; queue->hctx = hctx; } static int nvme_fc_init_hctx(struct blk_mq_hw_ctx *hctx, void *data, unsigned int hctx_idx) { struct nvme_fc_ctrl *ctrl = data; __nvme_fc_init_hctx(hctx, ctrl, hctx_idx + 1); return 0; } static int nvme_fc_init_admin_hctx(struct blk_mq_hw_ctx *hctx, void *data, unsigned int hctx_idx) { struct nvme_fc_ctrl *ctrl = data; __nvme_fc_init_hctx(hctx, ctrl, hctx_idx); return 0; } static void nvme_fc_init_queue(struct nvme_fc_ctrl *ctrl, int idx) { struct nvme_fc_queue *queue; queue = &ctrl->queues[idx]; memset(queue, 0, sizeof(*queue)); queue->ctrl = ctrl; queue->qnum = idx; atomic_set(&queue->csn, 1); queue->dev = ctrl->dev; if (idx > 0) queue->cmnd_capsule_len = ctrl->ctrl.ioccsz * 16; else queue->cmnd_capsule_len = sizeof(struct nvme_command); /* * Considered whether we should allocate buffers for all SQEs * and CQEs and dma map them - mapping their respective entries * into the request structures (kernel vm addr and dma address) * thus the driver could use the buffers/mappings directly. * It only makes sense if the LLDD would use them for its * messaging api. It's very unlikely most adapter api's would use * a native NVME sqe/cqe. More reasonable if FC-NVME IU payload * structures were used instead. */ } /* * This routine terminates a queue at the transport level. * The transport has already ensured that all outstanding ios on * the queue have been terminated. * The transport will send a Disconnect LS request to terminate * the queue's connection. Termination of the admin queue will also * terminate the association at the target. */ static void nvme_fc_free_queue(struct nvme_fc_queue *queue) { if (!test_and_clear_bit(NVME_FC_Q_CONNECTED, &queue->flags)) return; clear_bit(NVME_FC_Q_LIVE, &queue->flags); /* * Current implementation never disconnects a single queue. * It always terminates a whole association. So there is never * a disconnect(queue) LS sent to the target. */ queue->connection_id = 0; atomic_set(&queue->csn, 1); } static void __nvme_fc_delete_hw_queue(struct nvme_fc_ctrl *ctrl, struct nvme_fc_queue *queue, unsigned int qidx) { if (ctrl->lport->ops->delete_queue) ctrl->lport->ops->delete_queue(&ctrl->lport->localport, qidx, queue->lldd_handle); queue->lldd_handle = NULL; } static void nvme_fc_free_io_queues(struct nvme_fc_ctrl *ctrl) { int i; for (i = 1; i < ctrl->ctrl.queue_count; i++) nvme_fc_free_queue(&ctrl->queues[i]); } static int __nvme_fc_create_hw_queue(struct nvme_fc_ctrl *ctrl, struct nvme_fc_queue *queue, unsigned int qidx, u16 qsize) { int ret = 0; queue->lldd_handle = NULL; if (ctrl->lport->ops->create_queue) ret = ctrl->lport->ops->create_queue(&ctrl->lport->localport, qidx, qsize, &queue->lldd_handle); return ret; } static void nvme_fc_delete_hw_io_queues(struct nvme_fc_ctrl *ctrl) { struct nvme_fc_queue *queue = &ctrl->queues[ctrl->ctrl.queue_count - 1]; int i; for (i = ctrl->ctrl.queue_count - 1; i >= 1; i--, queue--) __nvme_fc_delete_hw_queue(ctrl, queue, i); } static int nvme_fc_create_hw_io_queues(struct nvme_fc_ctrl *ctrl, u16 qsize) { struct nvme_fc_queue *queue = &ctrl->queues[1]; int i, ret; for (i = 1; i < ctrl->ctrl.queue_count; i++, queue++) { ret = __nvme_fc_create_hw_queue(ctrl, queue, i, qsize); if (ret) goto delete_queues; } return 0; delete_queues: for (; i >= 0; i--) __nvme_fc_delete_hw_queue(ctrl, &ctrl->queues[i], i); return ret; } static int nvme_fc_connect_io_queues(struct nvme_fc_ctrl *ctrl, u16 qsize) { int i, ret = 0; for (i = 1; i < ctrl->ctrl.queue_count; i++) { ret = nvme_fc_connect_queue(ctrl, &ctrl->queues[i], qsize, (qsize / 5)); if (ret) break; ret = nvmf_connect_io_queue(&ctrl->ctrl, i, false); if (ret) break; set_bit(NVME_FC_Q_LIVE, &ctrl->queues[i].flags); } return ret; } static void nvme_fc_init_io_queues(struct nvme_fc_ctrl *ctrl) { int i; for (i = 1; i < ctrl->ctrl.queue_count; i++) nvme_fc_init_queue(ctrl, i); } static void nvme_fc_ctrl_free(struct kref *ref) { struct nvme_fc_ctrl *ctrl = container_of(ref, struct nvme_fc_ctrl, ref); unsigned long flags; if (ctrl->ctrl.tagset) { blk_cleanup_queue(ctrl->ctrl.connect_q); blk_mq_free_tag_set(&ctrl->tag_set); } /* remove from rport list */ spin_lock_irqsave(&ctrl->rport->lock, flags); list_del(&ctrl->ctrl_list); spin_unlock_irqrestore(&ctrl->rport->lock, flags); blk_mq_unquiesce_queue(ctrl->ctrl.admin_q); blk_cleanup_queue(ctrl->ctrl.admin_q); blk_mq_free_tag_set(&ctrl->admin_tag_set); kfree(ctrl->queues); put_device(ctrl->dev); nvme_fc_rport_put(ctrl->rport); ida_simple_remove(&nvme_fc_ctrl_cnt, ctrl->cnum); if (ctrl->ctrl.opts) nvmf_free_options(ctrl->ctrl.opts); kfree(ctrl); } static void nvme_fc_ctrl_put(struct nvme_fc_ctrl *ctrl) { kref_put(&ctrl->ref, nvme_fc_ctrl_free); } static int nvme_fc_ctrl_get(struct nvme_fc_ctrl *ctrl) { return kref_get_unless_zero(&ctrl->ref); } /* * All accesses from nvme core layer done - can now free the * controller. Called after last nvme_put_ctrl() call */ static void nvme_fc_nvme_ctrl_freed(struct nvme_ctrl *nctrl) { struct nvme_fc_ctrl *ctrl = to_fc_ctrl(nctrl); WARN_ON(nctrl != &ctrl->ctrl); nvme_fc_ctrl_put(ctrl); } static void nvme_fc_error_recovery(struct nvme_fc_ctrl *ctrl, char *errmsg) { int active; /* * if an error (io timeout, etc) while (re)connecting, * it's an error on creating the new association. * Start the error recovery thread if it hasn't already * been started. It is expected there could be multiple * ios hitting this path before things are cleaned up. */ if (ctrl->ctrl.state == NVME_CTRL_CONNECTING) { active = atomic_xchg(&ctrl->err_work_active, 1); if (!active && !schedule_work(&ctrl->err_work)) { atomic_set(&ctrl->err_work_active, 0); WARN_ON(1); } return; } /* Otherwise, only proceed if in LIVE state - e.g. on first error */ if (ctrl->ctrl.state != NVME_CTRL_LIVE) return; dev_warn(ctrl->ctrl.device, "NVME-FC{%d}: transport association error detected: %s\n", ctrl->cnum, errmsg); dev_warn(ctrl->ctrl.device, "NVME-FC{%d}: resetting controller\n", ctrl->cnum); nvme_reset_ctrl(&ctrl->ctrl); } static enum blk_eh_timer_return nvme_fc_timeout(struct request *rq, bool reserved) { struct nvme_fc_fcp_op *op = blk_mq_rq_to_pdu(rq); struct nvme_fc_ctrl *ctrl = op->ctrl; /* * we can't individually ABTS an io without affecting the queue, * thus killing the queue, and thus the association. * So resolve by performing a controller reset, which will stop * the host/io stack, terminate the association on the link, * and recreate an association on the link. */ nvme_fc_error_recovery(ctrl, "io timeout error"); /* * the io abort has been initiated. Have the reset timer * restarted and the abort completion will complete the io * shortly. Avoids a synchronous wait while the abort finishes. */ return BLK_EH_RESET_TIMER; } static int nvme_fc_map_data(struct nvme_fc_ctrl *ctrl, struct request *rq, struct nvme_fc_fcp_op *op) { struct nvmefc_fcp_req *freq = &op->fcp_req; enum dma_data_direction dir; int ret; freq->sg_cnt = 0; if (!blk_rq_payload_bytes(rq)) return 0; freq->sg_table.sgl = freq->first_sgl; ret = sg_alloc_table_chained(&freq->sg_table, blk_rq_nr_phys_segments(rq), freq->sg_table.sgl); if (ret) return -ENOMEM; op->nents = blk_rq_map_sg(rq->q, rq, freq->sg_table.sgl); WARN_ON(op->nents > blk_rq_nr_phys_segments(rq)); dir = (rq_data_dir(rq) == WRITE) ? DMA_TO_DEVICE : DMA_FROM_DEVICE; freq->sg_cnt = fc_dma_map_sg(ctrl->lport->dev, freq->sg_table.sgl, op->nents, dir); if (unlikely(freq->sg_cnt <= 0)) { sg_free_table_chained(&freq->sg_table, true); freq->sg_cnt = 0; return -EFAULT; } /* * TODO: blk_integrity_rq(rq) for DIF */ return 0; } static void nvme_fc_unmap_data(struct nvme_fc_ctrl *ctrl, struct request *rq, struct nvme_fc_fcp_op *op) { struct nvmefc_fcp_req *freq = &op->fcp_req; if (!freq->sg_cnt) return; fc_dma_unmap_sg(ctrl->lport->dev, freq->sg_table.sgl, op->nents, ((rq_data_dir(rq) == WRITE) ? DMA_TO_DEVICE : DMA_FROM_DEVICE)); nvme_cleanup_cmd(rq); sg_free_table_chained(&freq->sg_table, true); freq->sg_cnt = 0; } /* * In FC, the queue is a logical thing. At transport connect, the target * creates its "queue" and returns a handle that is to be given to the * target whenever it posts something to the corresponding SQ. When an * SQE is sent on a SQ, FC effectively considers the SQE, or rather the * command contained within the SQE, an io, and assigns a FC exchange * to it. The SQE and the associated SQ handle are sent in the initial * CMD IU sents on the exchange. All transfers relative to the io occur * as part of the exchange. The CQE is the last thing for the io, * which is transferred (explicitly or implicitly) with the RSP IU * sent on the exchange. After the CQE is received, the FC exchange is * terminaed and the Exchange may be used on a different io. * * The transport to LLDD api has the transport making a request for a * new fcp io request to the LLDD. The LLDD then allocates a FC exchange * resource and transfers the command. The LLDD will then process all * steps to complete the io. Upon completion, the transport done routine * is called. * * So - while the operation is outstanding to the LLDD, there is a link * level FC exchange resource that is also outstanding. This must be * considered in all cleanup operations. */ static blk_status_t nvme_fc_start_fcp_op(struct nvme_fc_ctrl *ctrl, struct nvme_fc_queue *queue, struct nvme_fc_fcp_op *op, u32 data_len, enum nvmefc_fcp_datadir io_dir) { struct nvme_fc_cmd_iu *cmdiu = &op->cmd_iu; struct nvme_command *sqe = &cmdiu->sqe; u32 csn; int ret, opstate; /* * before attempting to send the io, check to see if we believe * the target device is present */ if (ctrl->rport->remoteport.port_state != FC_OBJSTATE_ONLINE) return BLK_STS_RESOURCE; if (!nvme_fc_ctrl_get(ctrl)) return BLK_STS_IOERR; /* format the FC-NVME CMD IU and fcp_req */ cmdiu->connection_id = cpu_to_be64(queue->connection_id); csn = atomic_inc_return(&queue->csn); cmdiu->csn = cpu_to_be32(csn); cmdiu->data_len = cpu_to_be32(data_len); switch (io_dir) { case NVMEFC_FCP_WRITE: cmdiu->flags = FCNVME_CMD_FLAGS_WRITE; break; case NVMEFC_FCP_READ: cmdiu->flags = FCNVME_CMD_FLAGS_READ; break; case NVMEFC_FCP_NODATA: cmdiu->flags = 0; break; } op->fcp_req.payload_length = data_len; op->fcp_req.io_dir = io_dir; op->fcp_req.transferred_length = 0; op->fcp_req.rcv_rsplen = 0; op->fcp_req.status = NVME_SC_SUCCESS; op->fcp_req.sqid = cpu_to_le16(queue->qnum); /* * validate per fabric rules, set fields mandated by fabric spec * as well as those by FC-NVME spec. */ WARN_ON_ONCE(sqe->common.metadata); sqe->common.flags |= NVME_CMD_SGL_METABUF; /* * format SQE DPTR field per FC-NVME rules: * type=0x5 Transport SGL Data Block Descriptor * subtype=0xA Transport-specific value * address=0 * length=length of the data series */ sqe->rw.dptr.sgl.type = (NVME_TRANSPORT_SGL_DATA_DESC << 4) | NVME_SGL_FMT_TRANSPORT_A; sqe->rw.dptr.sgl.length = cpu_to_le32(data_len); sqe->rw.dptr.sgl.addr = 0; if (!(op->flags & FCOP_FLAGS_AEN)) { ret = nvme_fc_map_data(ctrl, op->rq, op); if (ret < 0) { nvme_cleanup_cmd(op->rq); nvme_fc_ctrl_put(ctrl); if (ret == -ENOMEM || ret == -EAGAIN) return BLK_STS_RESOURCE; return BLK_STS_IOERR; } } fc_dma_sync_single_for_device(ctrl->lport->dev, op->fcp_req.cmddma, sizeof(op->cmd_iu), DMA_TO_DEVICE); atomic_set(&op->state, FCPOP_STATE_ACTIVE); if (!(op->flags & FCOP_FLAGS_AEN)) blk_mq_start_request(op->rq); ret = ctrl->lport->ops->fcp_io(&ctrl->lport->localport, &ctrl->rport->remoteport, queue->lldd_handle, &op->fcp_req); if (ret) { opstate = atomic_xchg(&op->state, FCPOP_STATE_COMPLETE); __nvme_fc_fcpop_chk_teardowns(ctrl, op, opstate); if (!(op->flags & FCOP_FLAGS_AEN)) nvme_fc_unmap_data(ctrl, op->rq, op); nvme_fc_ctrl_put(ctrl); if (ctrl->rport->remoteport.port_state == FC_OBJSTATE_ONLINE && ret != -EBUSY) return BLK_STS_IOERR; return BLK_STS_RESOURCE; } return BLK_STS_OK; } static blk_status_t nvme_fc_queue_rq(struct blk_mq_hw_ctx *hctx, const struct blk_mq_queue_data *bd) { struct nvme_ns *ns = hctx->queue->queuedata; struct nvme_fc_queue *queue = hctx->driver_data; struct nvme_fc_ctrl *ctrl = queue->ctrl; struct request *rq = bd->rq; struct nvme_fc_fcp_op *op = blk_mq_rq_to_pdu(rq); struct nvme_fc_cmd_iu *cmdiu = &op->cmd_iu; struct nvme_command *sqe = &cmdiu->sqe; enum nvmefc_fcp_datadir io_dir; bool queue_ready = test_bit(NVME_FC_Q_LIVE, &queue->flags); u32 data_len; blk_status_t ret; if (ctrl->rport->remoteport.port_state != FC_OBJSTATE_ONLINE || !nvmf_check_ready(&queue->ctrl->ctrl, rq, queue_ready)) return nvmf_fail_nonready_command(&queue->ctrl->ctrl, rq); ret = nvme_setup_cmd(ns, rq, sqe); if (ret) return ret; data_len = blk_rq_payload_bytes(rq); if (data_len) io_dir = ((rq_data_dir(rq) == WRITE) ? NVMEFC_FCP_WRITE : NVMEFC_FCP_READ); else io_dir = NVMEFC_FCP_NODATA; return nvme_fc_start_fcp_op(ctrl, queue, op, data_len, io_dir); } static void nvme_fc_submit_async_event(struct nvme_ctrl *arg) { struct nvme_fc_ctrl *ctrl = to_fc_ctrl(arg); struct nvme_fc_fcp_op *aen_op; unsigned long flags; bool terminating = false; blk_status_t ret; spin_lock_irqsave(&ctrl->lock, flags); if (ctrl->flags & FCCTRL_TERMIO) terminating = true; spin_unlock_irqrestore(&ctrl->lock, flags); if (terminating) return; aen_op = &ctrl->aen_ops[0]; ret = nvme_fc_start_fcp_op(ctrl, aen_op->queue, aen_op, 0, NVMEFC_FCP_NODATA); if (ret) dev_err(ctrl->ctrl.device, "failed async event work\n"); } static void nvme_fc_complete_rq(struct request *rq) { struct nvme_fc_fcp_op *op = blk_mq_rq_to_pdu(rq); struct nvme_fc_ctrl *ctrl = op->ctrl; atomic_set(&op->state, FCPOP_STATE_IDLE); nvme_fc_unmap_data(ctrl, rq, op); nvme_complete_rq(rq); nvme_fc_ctrl_put(ctrl); } /* * This routine is used by the transport when it needs to find active * io on a queue that is to be terminated. The transport uses * blk_mq_tagset_busy_itr() to find the busy requests, which then invoke * this routine to kill them on a 1 by 1 basis. * * As FC allocates FC exchange for each io, the transport must contact * the LLDD to terminate the exchange, thus releasing the FC exchange. * After terminating the exchange the LLDD will call the transport's * normal io done path for the request, but it will have an aborted * status. The done path will return the io request back to the block * layer with an error status. */ static bool nvme_fc_terminate_exchange(struct request *req, void *data, bool reserved) { struct nvme_ctrl *nctrl = data; struct nvme_fc_ctrl *ctrl = to_fc_ctrl(nctrl); struct nvme_fc_fcp_op *op = blk_mq_rq_to_pdu(req); __nvme_fc_abort_op(ctrl, op); return true; } static const struct blk_mq_ops nvme_fc_mq_ops = { .queue_rq = nvme_fc_queue_rq, .complete = nvme_fc_complete_rq, .init_request = nvme_fc_init_request, .exit_request = nvme_fc_exit_request, .init_hctx = nvme_fc_init_hctx, .timeout = nvme_fc_timeout, }; static int nvme_fc_create_io_queues(struct nvme_fc_ctrl *ctrl) { struct nvmf_ctrl_options *opts = ctrl->ctrl.opts; unsigned int nr_io_queues; int ret; nr_io_queues = min(min(opts->nr_io_queues, num_online_cpus()), ctrl->lport->ops->max_hw_queues); ret = nvme_set_queue_count(&ctrl->ctrl, &nr_io_queues); if (ret) { dev_info(ctrl->ctrl.device, "set_queue_count failed: %d\n", ret); return ret; } ctrl->ctrl.queue_count = nr_io_queues + 1; if (!nr_io_queues) return 0; nvme_fc_init_io_queues(ctrl); memset(&ctrl->tag_set, 0, sizeof(ctrl->tag_set)); ctrl->tag_set.ops = &nvme_fc_mq_ops; ctrl->tag_set.queue_depth = ctrl->ctrl.opts->queue_size; ctrl->tag_set.reserved_tags = 1; /* fabric connect */ ctrl->tag_set.numa_node = ctrl->ctrl.numa_node; ctrl->tag_set.flags = BLK_MQ_F_SHOULD_MERGE; ctrl->tag_set.cmd_size = struct_size((struct nvme_fcp_op_w_sgl *)NULL, priv, ctrl->lport->ops->fcprqst_priv_sz); ctrl->tag_set.driver_data = ctrl; ctrl->tag_set.nr_hw_queues = ctrl->ctrl.queue_count - 1; ctrl->tag_set.timeout = NVME_IO_TIMEOUT; ret = blk_mq_alloc_tag_set(&ctrl->tag_set); if (ret) return ret; ctrl->ctrl.tagset = &ctrl->tag_set; ctrl->ctrl.connect_q = blk_mq_init_queue(&ctrl->tag_set); if (IS_ERR(ctrl->ctrl.connect_q)) { ret = PTR_ERR(ctrl->ctrl.connect_q); goto out_free_tag_set; } ret = nvme_fc_create_hw_io_queues(ctrl, ctrl->ctrl.sqsize + 1); if (ret) goto out_cleanup_blk_queue; ret = nvme_fc_connect_io_queues(ctrl, ctrl->ctrl.sqsize + 1); if (ret) goto out_delete_hw_queues; ctrl->ioq_live = true; return 0; out_delete_hw_queues: nvme_fc_delete_hw_io_queues(ctrl); out_cleanup_blk_queue: blk_cleanup_queue(ctrl->ctrl.connect_q); out_free_tag_set: blk_mq_free_tag_set(&ctrl->tag_set); nvme_fc_free_io_queues(ctrl); /* force put free routine to ignore io queues */ ctrl->ctrl.tagset = NULL; return ret; } static int nvme_fc_recreate_io_queues(struct nvme_fc_ctrl *ctrl) { struct nvmf_ctrl_options *opts = ctrl->ctrl.opts; unsigned int nr_io_queues; int ret; nr_io_queues = min(min(opts->nr_io_queues, num_online_cpus()), ctrl->lport->ops->max_hw_queues); ret = nvme_set_queue_count(&ctrl->ctrl, &nr_io_queues); if (ret) { dev_info(ctrl->ctrl.device, "set_queue_count failed: %d\n", ret); return ret; } ctrl->ctrl.queue_count = nr_io_queues + 1; /* check for io queues existing */ if (ctrl->ctrl.queue_count == 1) return 0; ret = nvme_fc_create_hw_io_queues(ctrl, ctrl->ctrl.sqsize + 1); if (ret) goto out_free_io_queues; ret = nvme_fc_connect_io_queues(ctrl, ctrl->ctrl.sqsize + 1); if (ret) goto out_delete_hw_queues; blk_mq_update_nr_hw_queues(&ctrl->tag_set, nr_io_queues); return 0; out_delete_hw_queues: nvme_fc_delete_hw_io_queues(ctrl); out_free_io_queues: nvme_fc_free_io_queues(ctrl); return ret; } static void nvme_fc_rport_active_on_lport(struct nvme_fc_rport *rport) { struct nvme_fc_lport *lport = rport->lport; atomic_inc(&lport->act_rport_cnt); } static void nvme_fc_rport_inactive_on_lport(struct nvme_fc_rport *rport) { struct nvme_fc_lport *lport = rport->lport; u32 cnt; cnt = atomic_dec_return(&lport->act_rport_cnt); if (cnt == 0 && lport->localport.port_state == FC_OBJSTATE_DELETED) lport->ops->localport_delete(&lport->localport); } static int nvme_fc_ctlr_active_on_rport(struct nvme_fc_ctrl *ctrl) { struct nvme_fc_rport *rport = ctrl->rport; u32 cnt; if (ctrl->assoc_active) return 1; ctrl->assoc_active = true; cnt = atomic_inc_return(&rport->act_ctrl_cnt); if (cnt == 1) nvme_fc_rport_active_on_lport(rport); return 0; } static int nvme_fc_ctlr_inactive_on_rport(struct nvme_fc_ctrl *ctrl) { struct nvme_fc_rport *rport = ctrl->rport; struct nvme_fc_lport *lport = rport->lport; u32 cnt; /* ctrl->assoc_active=false will be set independently */ cnt = atomic_dec_return(&rport->act_ctrl_cnt); if (cnt == 0) { if (rport->remoteport.port_state == FC_OBJSTATE_DELETED) lport->ops->remoteport_delete(&rport->remoteport); nvme_fc_rport_inactive_on_lport(rport); } return 0; } /* * This routine restarts the controller on the host side, and * on the link side, recreates the controller association. */ static int nvme_fc_create_association(struct nvme_fc_ctrl *ctrl) { struct nvmf_ctrl_options *opts = ctrl->ctrl.opts; int ret; bool changed; ++ctrl->ctrl.nr_reconnects; if (ctrl->rport->remoteport.port_state != FC_OBJSTATE_ONLINE) return -ENODEV; if (nvme_fc_ctlr_active_on_rport(ctrl)) return -ENOTUNIQ; /* * Create the admin queue */ ret = __nvme_fc_create_hw_queue(ctrl, &ctrl->queues[0], 0, NVME_AQ_DEPTH); if (ret) goto out_free_queue; ret = nvme_fc_connect_admin_queue(ctrl, &ctrl->queues[0], NVME_AQ_DEPTH, (NVME_AQ_DEPTH / 4)); if (ret) goto out_delete_hw_queue; blk_mq_unquiesce_queue(ctrl->ctrl.admin_q); ret = nvmf_connect_admin_queue(&ctrl->ctrl); if (ret) goto out_disconnect_admin_queue; set_bit(NVME_FC_Q_LIVE, &ctrl->queues[0].flags); /* * Check controller capabilities * * todo:- add code to check if ctrl attributes changed from * prior connection values */ ret = nvmf_reg_read64(&ctrl->ctrl, NVME_REG_CAP, &ctrl->ctrl.cap); if (ret) { dev_err(ctrl->ctrl.device, "prop_get NVME_REG_CAP failed\n"); goto out_disconnect_admin_queue; } ctrl->ctrl.sqsize = min_t(int, NVME_CAP_MQES(ctrl->ctrl.cap), ctrl->ctrl.sqsize); ret = nvme_enable_ctrl(&ctrl->ctrl, ctrl->ctrl.cap); if (ret) goto out_disconnect_admin_queue; ctrl->ctrl.max_hw_sectors = (ctrl->lport->ops->max_sgl_segments - 1) << (PAGE_SHIFT - 9); ret = nvme_init_identify(&ctrl->ctrl); if (ret) goto out_disconnect_admin_queue; /* sanity checks */ /* FC-NVME does not have other data in the capsule */ if (ctrl->ctrl.icdoff) { dev_err(ctrl->ctrl.device, "icdoff %d is not supported!\n", ctrl->ctrl.icdoff); goto out_disconnect_admin_queue; } /* FC-NVME supports normal SGL Data Block Descriptors */ if (opts->queue_size > ctrl->ctrl.maxcmd) { /* warn if maxcmd is lower than queue_size */ dev_warn(ctrl->ctrl.device, "queue_size %zu > ctrl maxcmd %u, reducing " "to queue_size\n", opts->queue_size, ctrl->ctrl.maxcmd); opts->queue_size = ctrl->ctrl.maxcmd; } if (opts->queue_size > ctrl->ctrl.sqsize + 1) { /* warn if sqsize is lower than queue_size */ dev_warn(ctrl->ctrl.device, "queue_size %zu > ctrl sqsize %u, clamping down\n", opts->queue_size, ctrl->ctrl.sqsize + 1); opts->queue_size = ctrl->ctrl.sqsize + 1; } ret = nvme_fc_init_aen_ops(ctrl); if (ret) goto out_term_aen_ops; /* * Create the io queues */ if (ctrl->ctrl.queue_count > 1) { if (!ctrl->ioq_live) ret = nvme_fc_create_io_queues(ctrl); else ret = nvme_fc_recreate_io_queues(ctrl); if (ret) goto out_term_aen_ops; } changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE); ctrl->ctrl.nr_reconnects = 0; if (changed) nvme_start_ctrl(&ctrl->ctrl); return 0; /* Success */ out_term_aen_ops: nvme_fc_term_aen_ops(ctrl); out_disconnect_admin_queue: /* send a Disconnect(association) LS to fc-nvme target */ nvme_fc_xmt_disconnect_assoc(ctrl); out_delete_hw_queue: __nvme_fc_delete_hw_queue(ctrl, &ctrl->queues[0], 0); out_free_queue: nvme_fc_free_queue(&ctrl->queues[0]); ctrl->assoc_active = false; nvme_fc_ctlr_inactive_on_rport(ctrl); return ret; } /* * This routine stops operation of the controller on the host side. * On the host os stack side: Admin and IO queues are stopped, * outstanding ios on them terminated via FC ABTS. * On the link side: the association is terminated. */ static void nvme_fc_delete_association(struct nvme_fc_ctrl *ctrl) { unsigned long flags; if (!ctrl->assoc_active) return; ctrl->assoc_active = false; spin_lock_irqsave(&ctrl->lock, flags); ctrl->flags |= FCCTRL_TERMIO; ctrl->iocnt = 0; spin_unlock_irqrestore(&ctrl->lock, flags); /* * If io queues are present, stop them and terminate all outstanding * ios on them. As FC allocates FC exchange for each io, the * transport must contact the LLDD to terminate the exchange, * thus releasing the FC exchange. We use blk_mq_tagset_busy_itr() * to tell us what io's are busy and invoke a transport routine * to kill them with the LLDD. After terminating the exchange * the LLDD will call the transport's normal io done path, but it * will have an aborted status. The done path will return the * io requests back to the block layer as part of normal completions * (but with error status). */ if (ctrl->ctrl.queue_count > 1) { nvme_stop_queues(&ctrl->ctrl); blk_mq_tagset_busy_iter(&ctrl->tag_set, nvme_fc_terminate_exchange, &ctrl->ctrl); } /* * Other transports, which don't have link-level contexts bound * to sqe's, would try to gracefully shutdown the controller by * writing the registers for shutdown and polling (call * nvme_shutdown_ctrl()). Given a bunch of i/o was potentially * just aborted and we will wait on those contexts, and given * there was no indication of how live the controlelr is on the * link, don't send more io to create more contexts for the * shutdown. Let the controller fail via keepalive failure if * its still present. */ /* * clean up the admin queue. Same thing as above. * use blk_mq_tagset_busy_itr() and the transport routine to * terminate the exchanges. */ blk_mq_quiesce_queue(ctrl->ctrl.admin_q); blk_mq_tagset_busy_iter(&ctrl->admin_tag_set, nvme_fc_terminate_exchange, &ctrl->ctrl); /* kill the aens as they are a separate path */ nvme_fc_abort_aen_ops(ctrl); /* wait for all io that had to be aborted */ spin_lock_irq(&ctrl->lock); wait_event_lock_irq(ctrl->ioabort_wait, ctrl->iocnt == 0, ctrl->lock); ctrl->flags &= ~FCCTRL_TERMIO; spin_unlock_irq(&ctrl->lock); nvme_fc_term_aen_ops(ctrl); /* * send a Disconnect(association) LS to fc-nvme target * Note: could have been sent at top of process, but * cleaner on link traffic if after the aborts complete. * Note: if association doesn't exist, association_id will be 0 */ if (ctrl->association_id) nvme_fc_xmt_disconnect_assoc(ctrl); if (ctrl->ctrl.tagset) { nvme_fc_delete_hw_io_queues(ctrl); nvme_fc_free_io_queues(ctrl); } __nvme_fc_delete_hw_queue(ctrl, &ctrl->queues[0], 0); nvme_fc_free_queue(&ctrl->queues[0]); /* re-enable the admin_q so anything new can fast fail */ blk_mq_unquiesce_queue(ctrl->ctrl.admin_q); /* resume the io queues so that things will fast fail */ nvme_start_queues(&ctrl->ctrl); nvme_fc_ctlr_inactive_on_rport(ctrl); } static void nvme_fc_delete_ctrl(struct nvme_ctrl *nctrl) { struct nvme_fc_ctrl *ctrl = to_fc_ctrl(nctrl); cancel_work_sync(&ctrl->err_work); cancel_delayed_work_sync(&ctrl->connect_work); /* * kill the association on the link side. this will block * waiting for io to terminate */ nvme_fc_delete_association(ctrl); } static void nvme_fc_reconnect_or_delete(struct nvme_fc_ctrl *ctrl, int status) { struct nvme_fc_rport *rport = ctrl->rport; struct nvme_fc_remote_port *portptr = &rport->remoteport; unsigned long recon_delay = ctrl->ctrl.opts->reconnect_delay * HZ; bool recon = true; if (ctrl->ctrl.state != NVME_CTRL_CONNECTING) return; if (portptr->port_state == FC_OBJSTATE_ONLINE) dev_info(ctrl->ctrl.device, "NVME-FC{%d}: reset: Reconnect attempt failed (%d)\n", ctrl->cnum, status); else if (time_after_eq(jiffies, rport->dev_loss_end)) recon = false; if (recon && nvmf_should_reconnect(&ctrl->ctrl)) { if (portptr->port_state == FC_OBJSTATE_ONLINE) dev_info(ctrl->ctrl.device, "NVME-FC{%d}: Reconnect attempt in %ld " "seconds\n", ctrl->cnum, recon_delay / HZ); else if (time_after(jiffies + recon_delay, rport->dev_loss_end)) recon_delay = rport->dev_loss_end - jiffies; queue_delayed_work(nvme_wq, &ctrl->connect_work, recon_delay); } else { if (portptr->port_state == FC_OBJSTATE_ONLINE) dev_warn(ctrl->ctrl.device, "NVME-FC{%d}: Max reconnect attempts (%d) " "reached.\n", ctrl->cnum, ctrl->ctrl.nr_reconnects); else dev_warn(ctrl->ctrl.device, "NVME-FC{%d}: dev_loss_tmo (%d) expired " "while waiting for remoteport connectivity.\n", ctrl->cnum, portptr->dev_loss_tmo); WARN_ON(nvme_delete_ctrl(&ctrl->ctrl)); } } static void __nvme_fc_terminate_io(struct nvme_fc_ctrl *ctrl) { nvme_stop_keep_alive(&ctrl->ctrl); /* will block will waiting for io to terminate */ nvme_fc_delete_association(ctrl); if (ctrl->ctrl.state != NVME_CTRL_CONNECTING && !nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_CONNECTING)) dev_err(ctrl->ctrl.device, "NVME-FC{%d}: error_recovery: Couldn't change state " "to CONNECTING\n", ctrl->cnum); } static void nvme_fc_reset_ctrl_work(struct work_struct *work) { struct nvme_fc_ctrl *ctrl = container_of(work, struct nvme_fc_ctrl, ctrl.reset_work); int ret; __nvme_fc_terminate_io(ctrl); nvme_stop_ctrl(&ctrl->ctrl); if (ctrl->rport->remoteport.port_state == FC_OBJSTATE_ONLINE) ret = nvme_fc_create_association(ctrl); else ret = -ENOTCONN; if (ret) nvme_fc_reconnect_or_delete(ctrl, ret); else dev_info(ctrl->ctrl.device, "NVME-FC{%d}: controller reset complete\n", ctrl->cnum); } static void nvme_fc_connect_err_work(struct work_struct *work) { struct nvme_fc_ctrl *ctrl = container_of(work, struct nvme_fc_ctrl, err_work); __nvme_fc_terminate_io(ctrl); atomic_set(&ctrl->err_work_active, 0); /* * Rescheduling the connection after recovering * from the io error is left to the reconnect work * item, which is what should have stalled waiting on * the io that had the error that scheduled this work. */ } static const struct nvme_ctrl_ops nvme_fc_ctrl_ops = { .name = "fc", .module = THIS_MODULE, .flags = NVME_F_FABRICS, .reg_read32 = nvmf_reg_read32, .reg_read64 = nvmf_reg_read64, .reg_write32 = nvmf_reg_write32, .free_ctrl = nvme_fc_nvme_ctrl_freed, .submit_async_event = nvme_fc_submit_async_event, .delete_ctrl = nvme_fc_delete_ctrl, .get_address = nvmf_get_address, }; static void nvme_fc_connect_ctrl_work(struct work_struct *work) { int ret; struct nvme_fc_ctrl *ctrl = container_of(to_delayed_work(work), struct nvme_fc_ctrl, connect_work); ret = nvme_fc_create_association(ctrl); if (ret) nvme_fc_reconnect_or_delete(ctrl, ret); else dev_info(ctrl->ctrl.device, "NVME-FC{%d}: controller connect complete\n", ctrl->cnum); } static const struct blk_mq_ops nvme_fc_admin_mq_ops = { .queue_rq = nvme_fc_queue_rq, .complete = nvme_fc_complete_rq, .init_request = nvme_fc_init_request, .exit_request = nvme_fc_exit_request, .init_hctx = nvme_fc_init_admin_hctx, .timeout = nvme_fc_timeout, }; /* * Fails a controller request if it matches an existing controller * (association) with the same tuple: * <Host NQN, Host ID, local FC port, remote FC port, SUBSYS NQN> * * The ports don't need to be compared as they are intrinsically * already matched by the port pointers supplied. */ static bool nvme_fc_existing_controller(struct nvme_fc_rport *rport, struct nvmf_ctrl_options *opts) { struct nvme_fc_ctrl *ctrl; unsigned long flags; bool found = false; spin_lock_irqsave(&rport->lock, flags); list_for_each_entry(ctrl, &rport->ctrl_list, ctrl_list) { found = nvmf_ctlr_matches_baseopts(&ctrl->ctrl, opts); if (found) break; } spin_unlock_irqrestore(&rport->lock, flags); return found; } static struct nvme_ctrl * nvme_fc_init_ctrl(struct device *dev, struct nvmf_ctrl_options *opts, struct nvme_fc_lport *lport, struct nvme_fc_rport *rport) { struct nvme_fc_ctrl *ctrl; unsigned long flags; int ret, idx; if (!(rport->remoteport.port_role & (FC_PORT_ROLE_NVME_DISCOVERY | FC_PORT_ROLE_NVME_TARGET))) { ret = -EBADR; goto out_fail; } if (!opts->duplicate_connect && nvme_fc_existing_controller(rport, opts)) { ret = -EALREADY; goto out_fail; } ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL); if (!ctrl) { ret = -ENOMEM; goto out_fail; } idx = ida_simple_get(&nvme_fc_ctrl_cnt, 0, 0, GFP_KERNEL); if (idx < 0) { ret = -ENOSPC; goto out_free_ctrl; } ctrl->ctrl.opts = opts; ctrl->ctrl.nr_reconnects = 0; ctrl->ctrl.numa_node = dev_to_node(lport->dev); INIT_LIST_HEAD(&ctrl->ctrl_list); ctrl->lport = lport; ctrl->rport = rport; ctrl->dev = lport->dev; ctrl->cnum = idx; ctrl->ioq_live = false; ctrl->assoc_active = false; atomic_set(&ctrl->err_work_active, 0); init_waitqueue_head(&ctrl->ioabort_wait); get_device(ctrl->dev); kref_init(&ctrl->ref); INIT_WORK(&ctrl->ctrl.reset_work, nvme_fc_reset_ctrl_work); INIT_DELAYED_WORK(&ctrl->connect_work, nvme_fc_connect_ctrl_work); INIT_WORK(&ctrl->err_work, nvme_fc_connect_err_work); spin_lock_init(&ctrl->lock); /* io queue count */ ctrl->ctrl.queue_count = min_t(unsigned int, opts->nr_io_queues, lport->ops->max_hw_queues); ctrl->ctrl.queue_count++; /* +1 for admin queue */ ctrl->ctrl.sqsize = opts->queue_size - 1; ctrl->ctrl.kato = opts->kato; ctrl->ctrl.cntlid = 0xffff; ret = -ENOMEM; ctrl->queues = kcalloc(ctrl->ctrl.queue_count, sizeof(struct nvme_fc_queue), GFP_KERNEL); if (!ctrl->queues) goto out_free_ida; nvme_fc_init_queue(ctrl, 0); memset(&ctrl->admin_tag_set, 0, sizeof(ctrl->admin_tag_set)); ctrl->admin_tag_set.ops = &nvme_fc_admin_mq_ops; ctrl->admin_tag_set.queue_depth = NVME_AQ_MQ_TAG_DEPTH; ctrl->admin_tag_set.reserved_tags = 2; /* fabric connect + Keep-Alive */ ctrl->admin_tag_set.numa_node = ctrl->ctrl.numa_node; ctrl->admin_tag_set.cmd_size = struct_size((struct nvme_fcp_op_w_sgl *)NULL, priv, ctrl->lport->ops->fcprqst_priv_sz); ctrl->admin_tag_set.driver_data = ctrl; ctrl->admin_tag_set.nr_hw_queues = 1; ctrl->admin_tag_set.timeout = ADMIN_TIMEOUT; ctrl->admin_tag_set.flags = BLK_MQ_F_NO_SCHED; ret = blk_mq_alloc_tag_set(&ctrl->admin_tag_set); if (ret) goto out_free_queues; ctrl->ctrl.admin_tagset = &ctrl->admin_tag_set; ctrl->ctrl.admin_q = blk_mq_init_queue(&ctrl->admin_tag_set); if (IS_ERR(ctrl->ctrl.admin_q)) { ret = PTR_ERR(ctrl->ctrl.admin_q); goto out_free_admin_tag_set; } /* * Would have been nice to init io queues tag set as well. * However, we require interaction from the controller * for max io queue count before we can do so. * Defer this to the connect path. */ ret = nvme_init_ctrl(&ctrl->ctrl, dev, &nvme_fc_ctrl_ops, 0); if (ret) goto out_cleanup_admin_q; /* at this point, teardown path changes to ref counting on nvme ctrl */ spin_lock_irqsave(&rport->lock, flags); list_add_tail(&ctrl->ctrl_list, &rport->ctrl_list); spin_unlock_irqrestore(&rport->lock, flags); if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_RESETTING) || !nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_CONNECTING)) { dev_err(ctrl->ctrl.device, "NVME-FC{%d}: failed to init ctrl state\n", ctrl->cnum); goto fail_ctrl; } nvme_get_ctrl(&ctrl->ctrl); if (!queue_delayed_work(nvme_wq, &ctrl->connect_work, 0)) { nvme_put_ctrl(&ctrl->ctrl); dev_err(ctrl->ctrl.device, "NVME-FC{%d}: failed to schedule initial connect\n", ctrl->cnum); goto fail_ctrl; } flush_delayed_work(&ctrl->connect_work); dev_info(ctrl->ctrl.device, "NVME-FC{%d}: new ctrl: NQN \"%s\"\n", ctrl->cnum, ctrl->ctrl.opts->subsysnqn); return &ctrl->ctrl; fail_ctrl: nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_DELETING); cancel_work_sync(&ctrl->ctrl.reset_work); cancel_work_sync(&ctrl->err_work); cancel_delayed_work_sync(&ctrl->connect_work); ctrl->ctrl.opts = NULL; /* initiate nvme ctrl ref counting teardown */ nvme_uninit_ctrl(&ctrl->ctrl); /* Remove core ctrl ref. */ nvme_put_ctrl(&ctrl->ctrl); /* as we're past the point where we transition to the ref * counting teardown path, if we return a bad pointer here, * the calling routine, thinking it's prior to the * transition, will do an rport put. Since the teardown * path also does a rport put, we do an extra get here to * so proper order/teardown happens. */ nvme_fc_rport_get(rport); return ERR_PTR(-EIO); out_cleanup_admin_q: blk_cleanup_queue(ctrl->ctrl.admin_q); out_free_admin_tag_set: blk_mq_free_tag_set(&ctrl->admin_tag_set); out_free_queues: kfree(ctrl->queues); out_free_ida: put_device(ctrl->dev); ida_simple_remove(&nvme_fc_ctrl_cnt, ctrl->cnum); out_free_ctrl: kfree(ctrl); out_fail: /* exit via here doesn't follow ctlr ref points */ return ERR_PTR(ret); } struct nvmet_fc_traddr { u64 nn; u64 pn; }; static int __nvme_fc_parse_u64(substring_t *sstr, u64 *val) { u64 token64; if (match_u64(sstr, &token64)) return -EINVAL; *val = token64; return 0; } /* * This routine validates and extracts the WWN's from the TRADDR string. * As kernel parsers need the 0x to determine number base, universally * build string to parse with 0x prefix before parsing name strings. */ static int nvme_fc_parse_traddr(struct nvmet_fc_traddr *traddr, char *buf, size_t blen) { char name[2 + NVME_FC_TRADDR_HEXNAMELEN + 1]; substring_t wwn = { name, &name[sizeof(name)-1] }; int nnoffset, pnoffset; /* validate if string is one of the 2 allowed formats */ if (strnlen(buf, blen) == NVME_FC_TRADDR_MAXLENGTH && !strncmp(buf, "nn-0x", NVME_FC_TRADDR_OXNNLEN) && !strncmp(&buf[NVME_FC_TRADDR_MAX_PN_OFFSET], "pn-0x", NVME_FC_TRADDR_OXNNLEN)) { nnoffset = NVME_FC_TRADDR_OXNNLEN; pnoffset = NVME_FC_TRADDR_MAX_PN_OFFSET + NVME_FC_TRADDR_OXNNLEN; } else if ((strnlen(buf, blen) == NVME_FC_TRADDR_MINLENGTH && !strncmp(buf, "nn-", NVME_FC_TRADDR_NNLEN) && !strncmp(&buf[NVME_FC_TRADDR_MIN_PN_OFFSET], "pn-", NVME_FC_TRADDR_NNLEN))) { nnoffset = NVME_FC_TRADDR_NNLEN; pnoffset = NVME_FC_TRADDR_MIN_PN_OFFSET + NVME_FC_TRADDR_NNLEN; } else goto out_einval; name[0] = '0'; name[1] = 'x'; name[2 + NVME_FC_TRADDR_HEXNAMELEN] = 0; memcpy(&name[2], &buf[nnoffset], NVME_FC_TRADDR_HEXNAMELEN); if (__nvme_fc_parse_u64(&wwn, &traddr->nn)) goto out_einval; memcpy(&name[2], &buf[pnoffset], NVME_FC_TRADDR_HEXNAMELEN); if (__nvme_fc_parse_u64(&wwn, &traddr->pn)) goto out_einval; return 0; out_einval: pr_warn("%s: bad traddr string\n", __func__); return -EINVAL; } static struct nvme_ctrl * nvme_fc_create_ctrl(struct device *dev, struct nvmf_ctrl_options *opts) { struct nvme_fc_lport *lport; struct nvme_fc_rport *rport; struct nvme_ctrl *ctrl; struct nvmet_fc_traddr laddr = { 0L, 0L }; struct nvmet_fc_traddr raddr = { 0L, 0L }; unsigned long flags; int ret; ret = nvme_fc_parse_traddr(&raddr, opts->traddr, NVMF_TRADDR_SIZE); if (ret || !raddr.nn || !raddr.pn) return ERR_PTR(-EINVAL); ret = nvme_fc_parse_traddr(&laddr, opts->host_traddr, NVMF_TRADDR_SIZE); if (ret || !laddr.nn || !laddr.pn) return ERR_PTR(-EINVAL); /* find the host and remote ports to connect together */ spin_lock_irqsave(&nvme_fc_lock, flags); list_for_each_entry(lport, &nvme_fc_lport_list, port_list) { if (lport->localport.node_name != laddr.nn || lport->localport.port_name != laddr.pn) continue; list_for_each_entry(rport, &lport->endp_list, endp_list) { if (rport->remoteport.node_name != raddr.nn || rport->remoteport.port_name != raddr.pn) continue; /* if fail to get reference fall through. Will error */ if (!nvme_fc_rport_get(rport)) break; spin_unlock_irqrestore(&nvme_fc_lock, flags); ctrl = nvme_fc_init_ctrl(dev, opts, lport, rport); if (IS_ERR(ctrl)) nvme_fc_rport_put(rport); return ctrl; } } spin_unlock_irqrestore(&nvme_fc_lock, flags); pr_warn("%s: %s - %s combination not found\n", __func__, opts->traddr, opts->host_traddr); return ERR_PTR(-ENOENT); } static struct nvmf_transport_ops nvme_fc_transport = { .name = "fc", .module = THIS_MODULE, .required_opts = NVMF_OPT_TRADDR | NVMF_OPT_HOST_TRADDR, .allowed_opts = NVMF_OPT_RECONNECT_DELAY | NVMF_OPT_CTRL_LOSS_TMO, .create_ctrl = nvme_fc_create_ctrl, }; /* Arbitrary successive failures max. With lots of subsystems could be high */ #define DISCOVERY_MAX_FAIL 20 static ssize_t nvme_fc_nvme_discovery_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { unsigned long flags; LIST_HEAD(local_disc_list); struct nvme_fc_lport *lport; struct nvme_fc_rport *rport; int failcnt = 0; spin_lock_irqsave(&nvme_fc_lock, flags); restart: list_for_each_entry(lport, &nvme_fc_lport_list, port_list) { list_for_each_entry(rport, &lport->endp_list, endp_list) { if (!nvme_fc_lport_get(lport)) continue; if (!nvme_fc_rport_get(rport)) { /* * This is a temporary condition. Upon restart * this rport will be gone from the list. * * Revert the lport put and retry. Anything * added to the list already will be skipped (as * they are no longer list_empty). Loops should * resume at rports that were not yet seen. */ nvme_fc_lport_put(lport); if (failcnt++ < DISCOVERY_MAX_FAIL) goto restart; pr_err("nvme_discovery: too many reference " "failures\n"); goto process_local_list; } if (list_empty(&rport->disc_list)) list_add_tail(&rport->disc_list, &local_disc_list); } } process_local_list: while (!list_empty(&local_disc_list)) { rport = list_first_entry(&local_disc_list, struct nvme_fc_rport, disc_list); list_del_init(&rport->disc_list); spin_unlock_irqrestore(&nvme_fc_lock, flags); lport = rport->lport; /* signal discovery. Won't hurt if it repeats */ nvme_fc_signal_discovery_scan(lport, rport); nvme_fc_rport_put(rport); nvme_fc_lport_put(lport); spin_lock_irqsave(&nvme_fc_lock, flags); } spin_unlock_irqrestore(&nvme_fc_lock, flags); return count; } static DEVICE_ATTR(nvme_discovery, 0200, NULL, nvme_fc_nvme_discovery_store); static struct attribute *nvme_fc_attrs[] = { &dev_attr_nvme_discovery.attr, NULL }; static struct attribute_group nvme_fc_attr_group = { .attrs = nvme_fc_attrs, }; static const struct attribute_group *nvme_fc_attr_groups[] = { &nvme_fc_attr_group, NULL }; static struct class fc_class = { .name = "fc", .dev_groups = nvme_fc_attr_groups, .owner = THIS_MODULE, }; static int __init nvme_fc_init_module(void) { int ret; /* * NOTE: * It is expected that in the future the kernel will combine * the FC-isms that are currently under scsi and now being * added to by NVME into a new standalone FC class. The SCSI * and NVME protocols and their devices would be under this * new FC class. * * As we need something to post FC-specific udev events to, * specifically for nvme probe events, start by creating the * new device class. When the new standalone FC class is * put in place, this code will move to a more generic * location for the class. */ ret = class_register(&fc_class); if (ret) { pr_err("couldn't register class fc\n"); return ret; } /* * Create a device for the FC-centric udev events */ fc_udev_device = device_create(&fc_class, NULL, MKDEV(0, 0), NULL, "fc_udev_device"); if (IS_ERR(fc_udev_device)) { pr_err("couldn't create fc_udev device!\n"); ret = PTR_ERR(fc_udev_device); goto out_destroy_class; } ret = nvmf_register_transport(&nvme_fc_transport); if (ret) goto out_destroy_device; return 0; out_destroy_device: device_destroy(&fc_class, MKDEV(0, 0)); out_destroy_class: class_unregister(&fc_class); return ret; } static void __exit nvme_fc_exit_module(void) { /* sanity check - all lports should be removed */ if (!list_empty(&nvme_fc_lport_list)) pr_warn("%s: localport list not empty\n", __func__); nvmf_unregister_transport(&nvme_fc_transport); ida_destroy(&nvme_fc_local_port_cnt); ida_destroy(&nvme_fc_ctrl_cnt); device_destroy(&fc_class, MKDEV(0, 0)); class_unregister(&fc_class); } module_init(nvme_fc_init_module); module_exit(nvme_fc_exit_module); MODULE_LICENSE("GPL v2");
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