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	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 // SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (c) 2016 Avago Technologies.  All rights reserved.
  */
 #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 <linux/blk-cgroup.h>
 #include "nvme.h"
 #include "fabrics.h"
 #include <linux/nvme-fc-driver.h>
 #include <linux/nvme-fc.h>
 #include "fc.h"
 #include <scsi/scsi_transport_fc.h>
 #include <linux/blk-mq-pci.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 */
 #define NVME_FC_DEFAULT_RECONNECT_TMO   2   /* delay between reconnects
                          * when connected and a
                          * connection failure.
                          */
 
 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;
 };
 
 struct nvmefc_ls_rcv_op {
     struct nvme_fc_rport        *rport;
     struct nvmefc_ls_rsp        *lsrsp;
     union nvmefc_ls_requests    *rqstbuf;
     union nvmefc_ls_responses   *rspbuf;
     u16             rqstdatalen;
     bool                handled;
     dma_addr_t          rspdma;
     struct list_head        lsrcv_list; /* rport->ls_rcv_list */
 } __aligned(sizeof(u64));   /* alignment for other things alloc'd with */
 
 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[NVME_INLINE_SG_CNT];
     uint8_t         priv[];
 };
 
 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        ls_rcv_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;
     struct work_struct      lsrcv_work;
 } __aligned(sizeof(u64));   /* alignment for other things alloc'd with */
 
 /* fc_ctrl flags values - specified as bit positions */
 #define ASSOC_ACTIVE        0
 #define ASSOC_FAILED        1
 #define FCCTRL_TERMIO       2
 
 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;
     u64         association_id;
     struct nvmefc_ls_rcv_op *rcv_disconn;
 
     struct list_head    ctrl_list;  /* rport->ctrl_list */
 
     struct blk_mq_tag_set   admin_tag_set;
     struct blk_mq_tag_set   tag_set;
 
     struct work_struct  ioerr_work;
     struct delayed_work connect_work;
 
     struct kref     ref;
     unsigned long       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);
 
 static struct workqueue_struct *nvme_fc_wq;
 
 static bool nvme_fc_waiting_to_unload;
 static DECLARE_COMPLETION(nvme_fc_unload_proceed);
 
 /*
  * 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;
 
 static void nvme_fc_complete_rq(struct request *rq);
 
 /* *********************** 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_handle_ls_rqst_work(struct work_struct *work);
 
 
 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);
     if (nvme_fc_waiting_to_unload && list_empty(&nvme_fc_lport_list))
         complete(&nvme_fc_unload_proceed);
     spin_unlock_irqrestore(&nvme_fc_lock, flags);
 
     ida_free(&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_alloc(&nvme_fc_local_port_cnt, 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);
     if (template->local_priv_sz)
         newrec->localport.private = &newrec[1];
     else
         newrec->localport.private = NULL;
     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_free(&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_free(&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_alloc(&lport->endp_cnt, 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;
     INIT_LIST_HEAD(&newrec->ls_rcv_list);
     newrec->dev = lport->dev;
     newrec->lport = lport;
     if (lport->ops->remote_priv_sz)
         newrec->remoteport.private = &newrec[1];
     else
         newrec->remoteport.private = NULL;
     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);
     INIT_WORK(&newrec->lsrcv_work, nvme_fc_handle_ls_rqst_work);
 
     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:
     case NVME_CTRL_DELETING_NOIO:
     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_error_recovery(struct nvme_fc_ctrl *ctrl, char *errmsg);
 
 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);
 }
 
 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;
     unsigned long flags;
     int ret, fcret = 0;
 
     lsop = kzalloc((sizeof(*lsop) +
              sizeof(*assoc_rqst) + sizeof(*assoc_acc) +
              ctrl->lport->ops->lsrqst_priv_sz), GFP_KERNEL);
     if (!lsop) {
         dev_info(ctrl->ctrl.device,
             "NVME-FC{%d}: send Create Association failed: ENOMEM\n",
             ctrl->cnum);
         ret = -ENOMEM;
         goto out_no_memory;
     }
 
     assoc_rqst = (struct fcnvme_ls_cr_assoc_rqst *)&lsop[1];
     assoc_acc = (struct fcnvme_ls_cr_assoc_acc *)&assoc_rqst[1];
     lsreq = &lsop->ls_req;
     if (ctrl->lport->ops->lsrqst_priv_sz)
         lsreq->private = &assoc_acc[1];
     else
         lsreq->private = NULL;
 
     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_LS_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 Create Association LS failed: %s\n",
             queue->qnum, validation_errors[fcret]);
     } else {
         spin_lock_irqsave(&ctrl->lock, flags);
         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);
         spin_unlock_irqrestore(&ctrl->lock, 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) +
              sizeof(*conn_rqst) + sizeof(*conn_acc) +
              ctrl->lport->ops->lsrqst_priv_sz), GFP_KERNEL);
     if (!lsop) {
         dev_info(ctrl->ctrl.device,
             "NVME-FC{%d}: send Create Connection failed: ENOMEM\n",
             ctrl->cnum);
         ret = -ENOMEM;
         goto out_no_memory;
     }
 
     conn_rqst = (struct fcnvme_ls_cr_conn_rqst *)&lsop[1];
     conn_acc = (struct fcnvme_ls_cr_conn_acc *)&conn_rqst[1];
     lsreq = &lsop->ls_req;
     if (ctrl->lport->ops->lsrqst_priv_sz)
         lsreq->private = (void *)&conn_acc[1];
     else
         lsreq->private = NULL;
 
     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_LS_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 Create I/O Connection LS 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 I/O queue 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_assoc_rqst *discon_rqst;
     struct fcnvme_ls_disconnect_assoc_acc *discon_acc;
     struct nvmefc_ls_req_op *lsop;
     struct nvmefc_ls_req *lsreq;
     int ret;
 
     lsop = kzalloc((sizeof(*lsop) +
             sizeof(*discon_rqst) + sizeof(*discon_acc) +
             ctrl->lport->ops->lsrqst_priv_sz), GFP_KERNEL);
     if (!lsop) {
         dev_info(ctrl->ctrl.device,
             "NVME-FC{%d}: send Disconnect Association "
             "failed: ENOMEM\n",
             ctrl->cnum);
         return;
     }
 
     discon_rqst = (struct fcnvme_ls_disconnect_assoc_rqst *)&lsop[1];
     discon_acc = (struct fcnvme_ls_disconnect_assoc_acc *)&discon_rqst[1];
     lsreq = &lsop->ls_req;
     if (ctrl->lport->ops->lsrqst_priv_sz)
         lsreq->private = (void *)&discon_acc[1];
     else
         lsreq->private = NULL;
 
     nvmefc_fmt_lsreq_discon_assoc(lsreq, discon_rqst, discon_acc,
                 ctrl->association_id);
 
     ret = nvme_fc_send_ls_req_async(ctrl->rport, lsop,
                 nvme_fc_disconnect_assoc_done);
     if (ret)
         kfree(lsop);
 }
 
 static void
 nvme_fc_xmt_ls_rsp_done(struct nvmefc_ls_rsp *lsrsp)
 {
     struct nvmefc_ls_rcv_op *lsop = lsrsp->nvme_fc_private;
     struct nvme_fc_rport *rport = lsop->rport;
     struct nvme_fc_lport *lport = rport->lport;
     unsigned long flags;
 
     spin_lock_irqsave(&rport->lock, flags);
     list_del(&lsop->lsrcv_list);
     spin_unlock_irqrestore(&rport->lock, flags);
 
     fc_dma_sync_single_for_cpu(lport->dev, lsop->rspdma,
                 sizeof(*lsop->rspbuf), DMA_TO_DEVICE);
     fc_dma_unmap_single(lport->dev, lsop->rspdma,
             sizeof(*lsop->rspbuf), DMA_TO_DEVICE);
 
     kfree(lsop);
 
     nvme_fc_rport_put(rport);
 }
 
 static void
 nvme_fc_xmt_ls_rsp(struct nvmefc_ls_rcv_op *lsop)
 {
     struct nvme_fc_rport *rport = lsop->rport;
     struct nvme_fc_lport *lport = rport->lport;
     struct fcnvme_ls_rqst_w0 *w0 = &lsop->rqstbuf->w0;
     int ret;
 
     fc_dma_sync_single_for_device(lport->dev, lsop->rspdma,
                   sizeof(*lsop->rspbuf), DMA_TO_DEVICE);
 
     ret = lport->ops->xmt_ls_rsp(&lport->localport, &rport->remoteport,
                      lsop->lsrsp);
     if (ret) {
         dev_warn(lport->dev,
             "LLDD rejected LS RSP xmt: LS %d status %d\n",
             w0->ls_cmd, ret);
         nvme_fc_xmt_ls_rsp_done(lsop->lsrsp);
         return;
     }
 }
 
 static struct nvme_fc_ctrl *
 nvme_fc_match_disconn_ls(struct nvme_fc_rport *rport,
               struct nvmefc_ls_rcv_op *lsop)
 {
     struct fcnvme_ls_disconnect_assoc_rqst *rqst =
                     &lsop->rqstbuf->rq_dis_assoc;
     struct nvme_fc_ctrl *ctrl, *ret = NULL;
     struct nvmefc_ls_rcv_op *oldls = NULL;
     u64 association_id = be64_to_cpu(rqst->associd.association_id);
     unsigned long flags;
 
     spin_lock_irqsave(&rport->lock, flags);
 
     list_for_each_entry(ctrl, &rport->ctrl_list, ctrl_list) {
         if (!nvme_fc_ctrl_get(ctrl))
             continue;
         spin_lock(&ctrl->lock);
         if (association_id == ctrl->association_id) {
             oldls = ctrl->rcv_disconn;
             ctrl->rcv_disconn = lsop;
             ret = ctrl;
         }
         spin_unlock(&ctrl->lock);
         if (ret)
             /* leave the ctrl get reference */
             break;
         nvme_fc_ctrl_put(ctrl);
     }
 
     spin_unlock_irqrestore(&rport->lock, flags);
 
     /* transmit a response for anything that was pending */
     if (oldls) {
         dev_info(rport->lport->dev,
             "NVME-FC{%d}: Multiple Disconnect Association "
             "LS's received\n", ctrl->cnum);
         /* overwrite good response with bogus failure */
         oldls->lsrsp->rsplen = nvme_fc_format_rjt(oldls->rspbuf,
                         sizeof(*oldls->rspbuf),
                         rqst->w0.ls_cmd,
                         FCNVME_RJT_RC_UNAB,
                         FCNVME_RJT_EXP_NONE, 0);
         nvme_fc_xmt_ls_rsp(oldls);
     }
 
     return ret;
 }
 
 /*
  * returns true to mean LS handled and ls_rsp can be sent
  * returns false to defer ls_rsp xmt (will be done as part of
  *     association termination)
  */
 static bool
 nvme_fc_ls_disconnect_assoc(struct nvmefc_ls_rcv_op *lsop)
 {
     struct nvme_fc_rport *rport = lsop->rport;
     struct fcnvme_ls_disconnect_assoc_rqst *rqst =
                     &lsop->rqstbuf->rq_dis_assoc;
     struct fcnvme_ls_disconnect_assoc_acc *acc =
                     &lsop->rspbuf->rsp_dis_assoc;
     struct nvme_fc_ctrl *ctrl = NULL;
     int ret = 0;
 
     memset(acc, 0, sizeof(*acc));
 
     ret = nvmefc_vldt_lsreq_discon_assoc(lsop->rqstdatalen, rqst);
     if (!ret) {
         /* match an active association */
         ctrl = nvme_fc_match_disconn_ls(rport, lsop);
         if (!ctrl)
             ret = VERR_NO_ASSOC;
     }
 
     if (ret) {
         dev_info(rport->lport->dev,
             "Disconnect LS failed: %s\n",
             validation_errors[ret]);
         lsop->lsrsp->rsplen = nvme_fc_format_rjt(acc,
                     sizeof(*acc), rqst->w0.ls_cmd,
                     (ret == VERR_NO_ASSOC) ?
                         FCNVME_RJT_RC_INV_ASSOC :
                         FCNVME_RJT_RC_LOGIC,
                     FCNVME_RJT_EXP_NONE, 0);
         return true;
     }
 
     /* format an ACCept response */
 
     lsop->lsrsp->rsplen = sizeof(*acc);
 
     nvme_fc_format_rsp_hdr(acc, FCNVME_LS_ACC,
             fcnvme_lsdesc_len(
                 sizeof(struct fcnvme_ls_disconnect_assoc_acc)),
             FCNVME_LS_DISCONNECT_ASSOC);
 
     /*
      * the transmit of the response will occur after the exchanges
      * for the association have been ABTS'd by
      * nvme_fc_delete_association().
      */
 
     /* fail the association */
     nvme_fc_error_recovery(ctrl, "Disconnect Association LS received");
 
     /* release the reference taken by nvme_fc_match_disconn_ls() */
     nvme_fc_ctrl_put(ctrl);
 
     return false;
 }
 
 /*
  * Actual Processing routine for received FC-NVME LS Requests from the LLD
  * returns true if a response should be sent afterward, false if rsp will
  * be sent asynchronously.
  */
 static bool
 nvme_fc_handle_ls_rqst(struct nvmefc_ls_rcv_op *lsop)
 {
     struct fcnvme_ls_rqst_w0 *w0 = &lsop->rqstbuf->w0;
     bool ret = true;
 
     lsop->lsrsp->nvme_fc_private = lsop;
     lsop->lsrsp->rspbuf = lsop->rspbuf;
     lsop->lsrsp->rspdma = lsop->rspdma;
     lsop->lsrsp->done = nvme_fc_xmt_ls_rsp_done;
     /* Be preventative. handlers will later set to valid length */
     lsop->lsrsp->rsplen = 0;
 
     /*
      * handlers:
      *   parse request input, execute the request, and format the
      *   LS response
      */
     switch (w0->ls_cmd) {
     case FCNVME_LS_DISCONNECT_ASSOC:
         ret = nvme_fc_ls_disconnect_assoc(lsop);
         break;
     case FCNVME_LS_DISCONNECT_CONN:
         lsop->lsrsp->rsplen = nvme_fc_format_rjt(lsop->rspbuf,
                 sizeof(*lsop->rspbuf), w0->ls_cmd,
                 FCNVME_RJT_RC_UNSUP, FCNVME_RJT_EXP_NONE, 0);
         break;
     case FCNVME_LS_CREATE_ASSOCIATION:
     case FCNVME_LS_CREATE_CONNECTION:
         lsop->lsrsp->rsplen = nvme_fc_format_rjt(lsop->rspbuf,
                 sizeof(*lsop->rspbuf), w0->ls_cmd,
                 FCNVME_RJT_RC_LOGIC, FCNVME_RJT_EXP_NONE, 0);
         break;
     default:
         lsop->lsrsp->rsplen = nvme_fc_format_rjt(lsop->rspbuf,
                 sizeof(*lsop->rspbuf), w0->ls_cmd,
                 FCNVME_RJT_RC_INVAL, FCNVME_RJT_EXP_NONE, 0);
         break;
     }
 
     return(ret);
 }
 
 static void
 nvme_fc_handle_ls_rqst_work(struct work_struct *work)
 {
     struct nvme_fc_rport *rport =
         container_of(work, struct nvme_fc_rport, lsrcv_work);
     struct fcnvme_ls_rqst_w0 *w0;
     struct nvmefc_ls_rcv_op *lsop;
     unsigned long flags;
     bool sendrsp;
 
 restart:
     sendrsp = true;
     spin_lock_irqsave(&rport->lock, flags);
     list_for_each_entry(lsop, &rport->ls_rcv_list, lsrcv_list) {
         if (lsop->handled)
             continue;
 
         lsop->handled = true;
         if (rport->remoteport.port_state == FC_OBJSTATE_ONLINE) {
             spin_unlock_irqrestore(&rport->lock, flags);
             sendrsp = nvme_fc_handle_ls_rqst(lsop);
         } else {
             spin_unlock_irqrestore(&rport->lock, flags);
             w0 = &lsop->rqstbuf->w0;
             lsop->lsrsp->rsplen = nvme_fc_format_rjt(
                         lsop->rspbuf,
                         sizeof(*lsop->rspbuf),
                         w0->ls_cmd,
                         FCNVME_RJT_RC_UNAB,
                         FCNVME_RJT_EXP_NONE, 0);
         }
         if (sendrsp)
             nvme_fc_xmt_ls_rsp(lsop);
         goto restart;
     }
     spin_unlock_irqrestore(&rport->lock, flags);
 }
 
 /**
  * nvme_fc_rcv_ls_req - transport entry point called by an LLDD
  *                       upon the reception of a NVME LS request.
  *
  * The nvme-fc layer will copy payload to an internal structure for
  * processing.  As such, upon completion of the routine, the LLDD may
  * immediately free/reuse the LS request buffer passed in the call.
  *
  * If this routine returns error, the LLDD should abort the exchange.
  *
  * @portptr:    pointer to the (registered) remote port that the LS
  *              was received from. The remoteport is associated with
  *              a specific localport.
  * @lsrsp:      pointer to a nvmefc_ls_rsp response structure to be
  *              used to reference the exchange corresponding to the LS
  *              when issuing an ls response.
  * @lsreqbuf:   pointer to the buffer containing the LS Request
  * @lsreqbuf_len: length, in bytes, of the received LS request
  */
 int
 nvme_fc_rcv_ls_req(struct nvme_fc_remote_port *portptr,
             struct nvmefc_ls_rsp *lsrsp,
             void *lsreqbuf, u32 lsreqbuf_len)
 {
     struct nvme_fc_rport *rport = remoteport_to_rport(portptr);
     struct nvme_fc_lport *lport = rport->lport;
     struct fcnvme_ls_rqst_w0 *w0 = (struct fcnvme_ls_rqst_w0 *)lsreqbuf;
     struct nvmefc_ls_rcv_op *lsop;
     unsigned long flags;
     int ret;
 
     nvme_fc_rport_get(rport);
 
     /* validate there's a routine to transmit a response */
     if (!lport->ops->xmt_ls_rsp) {
         dev_info(lport->dev,
             "RCV %s LS failed: no LLDD xmt_ls_rsp\n",
             (w0->ls_cmd <= NVME_FC_LAST_LS_CMD_VALUE) ?
                 nvmefc_ls_names[w0->ls_cmd] : "");
         ret = -EINVAL;
         goto out_put;
     }
 
     if (lsreqbuf_len > sizeof(union nvmefc_ls_requests)) {
         dev_info(lport->dev,
             "RCV %s LS failed: payload too large\n",
             (w0->ls_cmd <= NVME_FC_LAST_LS_CMD_VALUE) ?
                 nvmefc_ls_names[w0->ls_cmd] : "");
         ret = -E2BIG;
         goto out_put;
     }
 
     lsop = kzalloc(sizeof(*lsop) +
             sizeof(union nvmefc_ls_requests) +
             sizeof(union nvmefc_ls_responses),
             GFP_KERNEL);
     if (!lsop) {
         dev_info(lport->dev,
             "RCV %s LS failed: No memory\n",
             (w0->ls_cmd <= NVME_FC_LAST_LS_CMD_VALUE) ?
                 nvmefc_ls_names[w0->ls_cmd] : "");
         ret = -ENOMEM;
         goto out_put;
     }
     lsop->rqstbuf = (union nvmefc_ls_requests *)&lsop[1];
     lsop->rspbuf = (union nvmefc_ls_responses *)&lsop->rqstbuf[1];
 
     lsop->rspdma = fc_dma_map_single(lport->dev, lsop->rspbuf,
                     sizeof(*lsop->rspbuf),
                     DMA_TO_DEVICE);
     if (fc_dma_mapping_error(lport->dev, lsop->rspdma)) {
         dev_info(lport->dev,
             "RCV %s LS failed: DMA mapping failure\n",
             (w0->ls_cmd <= NVME_FC_LAST_LS_CMD_VALUE) ?
                 nvmefc_ls_names[w0->ls_cmd] : "");
         ret = -EFAULT;
         goto out_free;
     }
 
     lsop->rport = rport;
     lsop->lsrsp = lsrsp;
 
     memcpy(lsop->rqstbuf, lsreqbuf, lsreqbuf_len);
     lsop->rqstdatalen = lsreqbuf_len;
 
     spin_lock_irqsave(&rport->lock, flags);
     if (rport->remoteport.port_state != FC_OBJSTATE_ONLINE) {
         spin_unlock_irqrestore(&rport->lock, flags);
         ret = -ENOTCONN;
         goto out_unmap;
     }
     list_add_tail(&lsop->lsrcv_list, &rport->ls_rcv_list);
     spin_unlock_irqrestore(&rport->lock, flags);
 
     schedule_work(&rport->lsrcv_work);
 
     return 0;
 
 out_unmap:
     fc_dma_unmap_single(lport->dev, lsop->rspdma,
             sizeof(*lsop->rspbuf), DMA_TO_DEVICE);
 out_free:
     kfree(lsop);
 out_put:
     nvme_fc_rport_put(rport);
     return ret;
 }
 EXPORT_SYMBOL_GPL(nvme_fc_rcv_ls_req);
 
 
 /* *********************** NVME Ctrl Routines **************************** */
 
 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 (test_bit(FCCTRL_TERMIO, &ctrl->flags)) {
         op->flags |= FCOP_FLAGS_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 (test_bit(FCCTRL_TERMIO, &ctrl->flags) &&
             op->flags & FCOP_FLAGS_TERMIO) {
             if (!--ctrl->iocnt)
                 wake_up(&ctrl->ioabort_wait);
         }
         spin_unlock_irqrestore(&ctrl->lock, flags);
     }
 }
 
 static void
 nvme_fc_ctrl_ioerr_work(struct work_struct *work)
 {
     struct nvme_fc_ctrl *ctrl =
             container_of(work, struct nvme_fc_ctrl, ioerr_work);
 
     nvme_fc_error_recovery(ctrl, "transport detected io error");
 }
 
 /*
  * nvme_fc_io_getuuid - Routine called to get the appid field
  * associated with request by the lldd
  * @req:IO request from nvme fc to driver
  * Returns: UUID if there is an appid associated with VM or
  * NULL if the user/libvirt has not set the appid to VM
  */
 char *nvme_fc_io_getuuid(struct nvmefc_fcp_req *req)
 {
     struct nvme_fc_fcp_op *op = fcp_req_to_fcp_op(req);
     struct request *rq = op->rq;
 
     if (!IS_ENABLED(CONFIG_BLK_CGROUP_FC_APPID) || !rq->bio)
         return NULL;
     return blkcg_get_fc_appid(rq->bio);
 }
 EXPORT_SYMBOL_GPL(nvme_fc_io_getuuid);
 
 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_HOST_ABORTED_CMD << 1);
     else if (freq->status) {
         status = cpu_to_le16(NVME_SC_HOST_PATH_ERROR << 1);
         dev_info(ctrl->ctrl.device,
             "NVME-FC{%d}: io failed due to lldd error %d\n",
             ctrl->cnum, freq->status);
     }
 
     /*
      * 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_HOST_PATH_ERROR << 1);
             dev_info(ctrl->ctrl.device,
                 "NVME-FC{%d}: io failed due to bad transfer "
                 "length: %d vs expected %d\n",
                 ctrl->cnum, freq->transferred_length,
                 be32_to_cpu(op->cmd_iu.data_len));
             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.ersp_result ||
                  sqe->common.command_id != cqe->command_id)) {
             status = cpu_to_le16(NVME_SC_HOST_PATH_ERROR << 1);
             dev_info(ctrl->ctrl.device,
                 "NVME-FC{%d}: io failed due to bad NVMe_ERSP: "
                 "iu len %d, xfr len %d vs %d, status code "
                 "%d, cmdid %d vs %d\n",
                 ctrl->cnum, be16_to_cpu(op->rsp_iu.iu_len),
                 be32_to_cpu(op->rsp_iu.xfrd_len),
                 freq->transferred_length,
                 op->rsp_iu.ersp_result,
                 sqe->common.command_id,
                 cqe->command_id);
             goto done;
         }
         result = cqe->result;
         status = cqe->status;
         break;
 
     default:
         status = cpu_to_le16(NVME_SC_HOST_PATH_ERROR << 1);
         dev_info(ctrl->ctrl.device,
             "NVME-FC{%d}: io failed due to odd NVMe_xRSP iu "
             "len %d\n",
             ctrl->cnum, freq->rcv_rsplen);
         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);
     if (!nvme_try_complete_req(rq, status, result))
         nvme_fc_complete_rq(rq);
 
 check_error:
     if (terminate_assoc && ctrl->ctrl.state != NVME_CTRL_RESETTING)
         queue_work(nvme_reset_wq, &ctrl->ioerr_work);
 }
 
 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->format_id = NVME_CMD_FORMAT_ID;
     cmdiu->fc_id = NVME_CMD_FC_ID;
     cmdiu->iu_len = cpu_to_be16(sizeof(*cmdiu) / sizeof(u32));
     if (queue->qnum)
         cmdiu->rsv_cat = fccmnd_set_cat_css(0,
                     (NVME_CC_CSS_NVM >> NVME_CC_CSS_SHIFT));
     else
         cmdiu->rsv_cat = fccmnd_set_cat_admin(0);
 
     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;
     op->op.fcp_req.private = &op->priv[0];
     nvme_req(rq)->ctrl = &ctrl->ctrl;
     nvme_req(rq)->cmd = &op->op.cmd_iu.sqe;
     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 = NULL;
     int i, ret;
 
     aen_op = ctrl->aen_ops;
     for (i = 0; i < NVME_NR_AEN_COMMANDS; i++, aen_op++) {
         if (ctrl->lport->ops->fcprqst_priv_sz) {
             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;
 
     cancel_work_sync(&ctrl->ctrl.async_event_work);
     aen_op = ctrl->aen_ops;
     for (i = 0; i < NVME_NR_AEN_COMMANDS; i++, aen_op++) {
         __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, 0);
     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, 0);
 }
 
 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);
         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_mq_destroy_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);
 
     nvme_start_admin_queue(&ctrl->ctrl);
     blk_mq_destroy_queue(ctrl->ctrl.admin_q);
     blk_mq_destroy_queue(ctrl->ctrl.fabrics_q);
     blk_mq_free_tag_set(&ctrl->admin_tag_set);
 
     kfree(ctrl->queues);
 
     put_device(ctrl->dev);
     nvme_fc_rport_put(ctrl->rport);
 
     ida_free(&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);
 }
 
 /*
  * 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)
 {
     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);
 
     op->nreq.flags |= NVME_REQ_CANCELLED;
     __nvme_fc_abort_op(ctrl, op);
     return true;
 }
 
 /*
  * This routine runs through all outstanding commands on the association
  * and aborts them.  This routine is typically be called by the
  * delete_association routine. It is also called due to an error during
  * reconnect. In that scenario, it is most likely a command that initializes
  * the controller, including fabric Connect commands on io queues, that
  * may have timed out or failed thus the io must be killed for the connect
  * thread to see the error.
  */
 static void
 __nvme_fc_abort_outstanding_ios(struct nvme_fc_ctrl *ctrl, bool start_queues)
 {
     int q;
 
     /*
      * if aborting io, the queues are no longer good, mark them
      * all as not live.
      */
     if (ctrl->ctrl.queue_count > 1) {
         for (q = 1; q < ctrl->ctrl.queue_count; q++)
             clear_bit(NVME_FC_Q_LIVE, &ctrl->queues[q].flags);
     }
     clear_bit(NVME_FC_Q_LIVE, &ctrl->queues[0].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);
         nvme_sync_io_queues(&ctrl->ctrl);
         blk_mq_tagset_busy_iter(&ctrl->tag_set,
                 nvme_fc_terminate_exchange, &ctrl->ctrl);
         blk_mq_tagset_wait_completed_request(&ctrl->tag_set);
         if (start_queues)
             nvme_start_queues(&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.
      */
     nvme_stop_admin_queue(&ctrl->ctrl);
     blk_sync_queue(ctrl->ctrl.admin_q);
     blk_mq_tagset_busy_iter(&ctrl->admin_tag_set,
                 nvme_fc_terminate_exchange, &ctrl->ctrl);
     blk_mq_tagset_wait_completed_request(&ctrl->admin_tag_set);
     if (start_queues)
         nvme_start_admin_queue(&ctrl->ctrl);
 }
 
 static void
 nvme_fc_error_recovery(struct nvme_fc_ctrl *ctrl, char *errmsg)
 {
     /*
      * if an error (io timeout, etc) while (re)connecting, the remote
      * port requested terminating of the association (disconnect_ls)
      * or an error (timeout or abort) occurred on an io while creating
      * the controller.  Abort any ios on the association and let the
      * create_association error path resolve things.
      */
     if (ctrl->ctrl.state == NVME_CTRL_CONNECTING) {
         __nvme_fc_abort_outstanding_ios(ctrl, true);
         set_bit(ASSOC_FAILED, &ctrl->flags);
         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 event: %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)
 {
     struct nvme_fc_fcp_op *op = blk_mq_rq_to_pdu(rq);
     struct nvme_fc_ctrl *ctrl = op->ctrl;
     struct nvme_fc_cmd_iu *cmdiu = &op->cmd_iu;
     struct nvme_command *sqe = &cmdiu->sqe;
 
     /*
      * Attempt to abort the offending command. Command completion
      * will detect the aborted io and will fail the connection.
      */
     dev_info(ctrl->ctrl.device,
         "NVME-FC{%d.%d}: io timeout: opcode %d fctype %d w10/11: "
         "x%08x/x%08x\n",
         ctrl->cnum, op->queue->qnum, sqe->common.opcode,
         sqe->connect.fctype, sqe->common.cdw10, sqe->common.cdw11);
     if (__nvme_fc_abort_op(ctrl, op))
         nvme_fc_error_recovery(ctrl, "io timeout abort failed");
 
     /*
      * 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;
     int ret;
 
     freq->sg_cnt = 0;
 
     if (!blk_rq_nr_phys_segments(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,
             NVME_INLINE_SG_CNT);
     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));
     freq->sg_cnt = fc_dma_map_sg(ctrl->lport->dev, freq->sg_table.sgl,
                 op->nents, rq_dma_dir(rq));
     if (unlikely(freq->sg_cnt <= 0)) {
         sg_free_table_chained(&freq->sg_table, NVME_INLINE_SG_CNT);
         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_dma_dir(rq));
 
     sg_free_table_chained(&freq->sg_table, NVME_INLINE_SG_CNT);
 
     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;
     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);
     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);
 
     cmdiu->csn = cpu_to_be32(atomic_inc_return(&queue->csn));
     ret = ctrl->lport->ops->fcp_io(&ctrl->lport->localport,
                     &ctrl->rport->remoteport,
                     queue->lldd_handle, &op->fcp_req);
 
     if (ret) {
         /*
          * If the lld fails to send the command is there an issue with
          * the csn value?  If the command that fails is the Connect,
          * no - as the connection won't be live.  If it is a command
          * post-connect, it's possible a gap in csn may be created.
          * Does this matter?  As Linux initiators don't send fused
          * commands, no.  The gap would exist, but as there's nothing
          * that depends on csn order to be delivered on the target
          * side, it shouldn't hurt.  It would be difficult for a
          * target to even detect the csn gap as it has no idea when the
          * cmd with the csn was supposed to arrive.
          */
         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_cleanup_cmd(op->rq);
         }
 
         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);
     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 ||
         !nvme_check_ready(&queue->ctrl->ctrl, rq, queue_ready))
         return nvme_fail_nonready_command(&queue->ctrl->ctrl, rq);
 
     ret = nvme_setup_cmd(ns, rq);
     if (ret)
         return ret;
 
     /*
      * nvme core doesn't quite treat the rq opaquely. Commands such
      * as WRITE ZEROES will return a non-zero rq payload_bytes yet
      * there is no actual payload to be transferred.
      * To get it right, key data transmission on there being 1 or
      * more physical segments in the sg list. If there is no
      * physical segments, there is no payload.
      */
     if (blk_rq_nr_phys_segments(rq)) {
         data_len = blk_rq_payload_bytes(rq);
         io_dir = ((rq_data_dir(rq) == WRITE) ?
                     NVMEFC_FCP_WRITE : NVMEFC_FCP_READ);
     } else {
         data_len = 0;
         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;
     blk_status_t ret;
 
     if (test_bit(FCCTRL_TERMIO, &ctrl->flags))
         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);
     op->flags &= ~FCOP_FLAGS_TERMIO;
 
     nvme_fc_unmap_data(ctrl, rq, op);
     nvme_complete_rq(rq);
     nvme_fc_ctrl_put(ctrl);
 }
 
 static int nvme_fc_map_queues(struct blk_mq_tag_set *set)
 {
     struct nvme_fc_ctrl *ctrl = set->driver_data;
     int i;
 
     for (i = 0; i < set->nr_maps; i++) {
         struct blk_mq_queue_map *map = &set->map[i];
 
         if (!map->nr_queues) {
             WARN_ON(i == HCTX_TYPE_DEFAULT);
             continue;
         }
 
         /* Call LLDD map queue functionality if defined */
         if (ctrl->lport->ops->map_queues)
             ctrl->lport->ops->map_queues(&ctrl->lport->localport,
                              map);
         else
             blk_mq_map_queues(map);
     }
     return 0;
 }
 
 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,
     .map_queues = nvme_fc_map_queues,
 };
 
 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 = NVMF_RESERVED_TAGS;
     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;
 
     ret = nvme_ctrl_init_connect_q(&(ctrl->ctrl));
     if (ret)
         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_mq_destroy_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;
     u32 prior_ioq_cnt = ctrl->ctrl.queue_count - 1;
     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;
     }
 
     if (!nr_io_queues && prior_ioq_cnt) {
         dev_info(ctrl->ctrl.device,
             "Fail Reconnect: At least 1 io queue "
             "required (was %d)\n", prior_ioq_cnt);
         return -ENOSPC;
     }
 
     ctrl->ctrl.queue_count = nr_io_queues + 1;
     /* check for io queues existing */
     if (ctrl->ctrl.queue_count == 1)
         return 0;
 
     if (prior_ioq_cnt != nr_io_queues) {
         dev_info(ctrl->ctrl.device,
             "reconnect: revising io queue count from %d to %d\n",
             prior_ioq_cnt, nr_io_queues);
         blk_mq_update_nr_hw_queues(&ctrl->tag_set, nr_io_queues);
     }
 
     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;
 
     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 (test_and_set_bit(ASSOC_ACTIVE, &ctrl->flags))
         return 1;
 
     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;
 
     /* clearing of ctrl->flags ASSOC_ACTIVE bit is in association delete */
 
     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;
     struct nvmefc_ls_rcv_op *disls = NULL;
     unsigned long flags;
     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;
 
     dev_info(ctrl->ctrl.device,
         "NVME-FC{%d}: create association : host wwpn 0x%016llx "
         " rport wwpn 0x%016llx: NQN \"%s\"\n",
         ctrl->cnum, ctrl->lport->localport.port_name,
         ctrl->rport->remoteport.port_name, ctrl->ctrl.opts->subsysnqn);
 
     clear_bit(ASSOC_FAILED, &ctrl->flags);
 
     /*
      * 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;
 
     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 = nvme_enable_ctrl(&ctrl->ctrl);
     if (ret || test_bit(ASSOC_FAILED, &ctrl->flags))
         goto out_disconnect_admin_queue;
 
     ctrl->ctrl.max_segments = ctrl->lport->ops->max_sgl_segments;
     ctrl->ctrl.max_hw_sectors = ctrl->ctrl.max_segments <<
                         (ilog2(SZ_4K) - 9);
 
     nvme_start_admin_queue(&ctrl->ctrl);
 
     ret = nvme_init_ctrl_finish(&ctrl->ctrl);
     if (ret || test_bit(ASSOC_FAILED, &ctrl->flags))
         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);
         ret = NVME_SC_INVALID_FIELD | NVME_SC_DNR;
         goto out_disconnect_admin_queue;
     }
 
     /* FC-NVME supports normal SGL Data Block Descriptors */
     if (!nvme_ctrl_sgl_supported(&ctrl->ctrl)) {
         dev_err(ctrl->ctrl.device,
             "Mandatory sgls are not supported!\n");
         ret = NVME_SC_INVALID_FIELD | NVME_SC_DNR;
         goto out_disconnect_admin_queue;
     }
 
     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 maxcmd\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, reducing "
             "to sqsize\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 || test_bit(ASSOC_FAILED, &ctrl->flags))
         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);
     spin_lock_irqsave(&ctrl->lock, flags);
     ctrl->association_id = 0;
     disls = ctrl->rcv_disconn;
     ctrl->rcv_disconn = NULL;
     spin_unlock_irqrestore(&ctrl->lock, flags);
     if (disls)
         nvme_fc_xmt_ls_rsp(disls);
 out_delete_hw_queue:
     __nvme_fc_delete_hw_queue(ctrl, &ctrl->queues[0], 0);
 out_free_queue:
     nvme_fc_free_queue(&ctrl->queues[0]);
     clear_bit(ASSOC_ACTIVE, &ctrl->flags);
     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)
 {
     struct nvmefc_ls_rcv_op *disls = NULL;
     unsigned long flags;
 
     if (!test_and_clear_bit(ASSOC_ACTIVE, &ctrl->flags))
         return;
 
     spin_lock_irqsave(&ctrl->lock, flags);
     set_bit(FCCTRL_TERMIO, &ctrl->flags);
     ctrl->iocnt = 0;
     spin_unlock_irqrestore(&ctrl->lock, flags);
 
     __nvme_fc_abort_outstanding_ios(ctrl, false);
 
     /* 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);
     clear_bit(FCCTRL_TERMIO, &ctrl->flags);
     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);
 
     spin_lock_irqsave(&ctrl->lock, flags);
     ctrl->association_id = 0;
     disls = ctrl->rcv_disconn;
     ctrl->rcv_disconn = NULL;
     spin_unlock_irqrestore(&ctrl->lock, flags);
     if (disls)
         /*
          * if a Disconnect Request was waiting for a response, send
          * now that all ABTS's have been issued (and are complete).
          */
         nvme_fc_xmt_ls_rsp(disls);
 
     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 */
     nvme_start_admin_queue(&ctrl->ctrl);
 
     /* 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->ioerr_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);
         if (status > 0 && (status & NVME_SC_DNR))
             recon = false;
     } 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) {
             if (status > 0 && (status & NVME_SC_DNR))
                 dev_warn(ctrl->ctrl.device,
                      "NVME-FC{%d}: reconnect failure\n",
                      ctrl->cnum);
             else
                 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, min_t(int, portptr->dev_loss_tmo,
                     (ctrl->ctrl.opts->max_reconnects *
                      ctrl->ctrl.opts->reconnect_delay)));
         WARN_ON(nvme_delete_ctrl(&ctrl->ctrl));
     }
 }
 
 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);
 
     nvme_stop_ctrl(&ctrl->ctrl);
 
     /* will block will waiting for io to terminate */
     nvme_fc_delete_association(ctrl);
 
     if (!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);
 
     if (ctrl->rport->remoteport.port_state == FC_OBJSTATE_ONLINE) {
         if (!queue_delayed_work(nvme_wq, &ctrl->connect_work, 0)) {
             dev_err(ctrl->ctrl.device,
                 "NVME-FC{%d}: failed to schedule connect "
                 "after reset\n", ctrl->cnum);
         } else {
             flush_delayed_work(&ctrl->connect_work);
         }
     } else {
         nvme_fc_reconnect_or_delete(ctrl, -ENOTCONN);
     }
 }
 
 
 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, ctrl_loss_tmo;
 
     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_alloc(&nvme_fc_ctrl_cnt, GFP_KERNEL);
     if (idx < 0) {
         ret = -ENOSPC;
         goto out_free_ctrl;
     }
 
     /*
      * if ctrl_loss_tmo is being enforced and the default reconnect delay
      * is being used, change to a shorter reconnect delay for FC.
      */
     if (opts->max_reconnects != -1 &&
         opts->reconnect_delay == NVMF_DEF_RECONNECT_DELAY &&
         opts->reconnect_delay > NVME_FC_DEFAULT_RECONNECT_TMO) {
         ctrl_loss_tmo = opts->max_reconnects * opts->reconnect_delay;
         opts->reconnect_delay = NVME_FC_DEFAULT_RECONNECT_TMO;
         opts->max_reconnects = DIV_ROUND_UP(ctrl_loss_tmo,
                         opts->reconnect_delay);
     }
 
     ctrl->ctrl.opts = opts;
     ctrl->ctrl.nr_reconnects = 0;
     if (lport->dev)
         ctrl->ctrl.numa_node = dev_to_node(lport->dev);
     else
         ctrl->ctrl.numa_node = NUMA_NO_NODE;
     INIT_LIST_HEAD(&ctrl->ctrl_list);
     ctrl->lport = lport;
     ctrl->rport = rport;
     ctrl->dev = lport->dev;
     ctrl->cnum = idx;
     ctrl->ioq_live = false;
     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->ioerr_work, nvme_fc_ctrl_ioerr_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 = NVMF_RESERVED_TAGS;
     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 = NVME_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.fabrics_q = blk_mq_init_queue(&ctrl->admin_tag_set);
     if (IS_ERR(ctrl->ctrl.fabrics_q)) {
         ret = PTR_ERR(ctrl->ctrl.fabrics_q);
         goto out_free_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_cleanup_fabrics_q;
     }
 
     /*
      * 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;
     }
 
     if (!queue_delayed_work(nvme_wq, &ctrl->connect_work, 0)) {
         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, nvmf_ctrl_subsysnqn(&ctrl->ctrl));
 
     return &ctrl->ctrl;
 
 fail_ctrl:
     nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_DELETING);
     cancel_work_sync(&ctrl->ioerr_work);
     cancel_work_sync(&ctrl->ctrl.reset_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_mq_destroy_queue(ctrl->ctrl.admin_q);
 out_cleanup_fabrics_q:
     blk_mq_destroy_queue(ctrl->ctrl.fabrics_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_free(&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 ||
             lport->localport.port_state != FC_OBJSTATE_ONLINE)
             continue;
 
         list_for_each_entry(rport, &lport->endp_list, endp_list) {
             if (rport->remoteport.node_name != raddr.nn ||
                 rport->remoteport.port_name != raddr.pn ||
                 rport->remoteport.port_state != FC_OBJSTATE_ONLINE)
                 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);
 
 #ifdef CONFIG_BLK_CGROUP_FC_APPID
 /* Parse the cgroup id from a buf and return the length of cgrpid */
 static int fc_parse_cgrpid(const char *buf, u64 *id)
 {
     char cgrp_id[16+1];
     int cgrpid_len, j;
 
     memset(cgrp_id, 0x0, sizeof(cgrp_id));
     for (cgrpid_len = 0, j = 0; cgrpid_len < 17; cgrpid_len++) {
         if (buf[cgrpid_len] != ':')
             cgrp_id[cgrpid_len] = buf[cgrpid_len];
         else {
             j = 1;
             break;
         }
     }
     if (!j)
         return -EINVAL;
     if (kstrtou64(cgrp_id, 16, id) < 0)
         return -EINVAL;
     return cgrpid_len;
 }
 
 /*
  * Parse and update the appid in the blkcg associated with the cgroupid.
  */
 static ssize_t fc_appid_store(struct device *dev,
         struct device_attribute *attr, const char *buf, size_t count)
 {
     size_t orig_count = count;
     u64 cgrp_id;
     int appid_len = 0;
     int cgrpid_len = 0;
     char app_id[FC_APPID_LEN];
     int ret = 0;
 
     if (buf[count-1] == '\n')
         count--;
 
     if ((count > (16+1+FC_APPID_LEN)) || (!strchr(buf, ':')))
         return -EINVAL;
 
     cgrpid_len = fc_parse_cgrpid(buf, &cgrp_id);
     if (cgrpid_len < 0)
         return -EINVAL;
     appid_len = count - cgrpid_len - 1;
     if (appid_len > FC_APPID_LEN)
         return -EINVAL;
 
     memset(app_id, 0x0, sizeof(app_id));
     memcpy(app_id, &buf[cgrpid_len+1], appid_len);
     ret = blkcg_set_fc_appid(app_id, cgrp_id, sizeof(app_id));
     if (ret < 0)
         return ret;
     return orig_count;
 }
 static DEVICE_ATTR(appid_store, 0200, NULL, fc_appid_store);
 #endif /* CONFIG_BLK_CGROUP_FC_APPID */
 
 static struct attribute *nvme_fc_attrs[] = {
     &dev_attr_nvme_discovery.attr,
 #ifdef CONFIG_BLK_CGROUP_FC_APPID
     &dev_attr_appid_store.attr,
 #endif
     NULL
 };
 
 static const 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;
 
     nvme_fc_wq = alloc_workqueue("nvme_fc_wq", WQ_MEM_RECLAIM, 0);
     if (!nvme_fc_wq)
         return -ENOMEM;
 
     /*
      * 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");
         goto out_destroy_wq;
     }
 
     /*
      * 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);
 out_destroy_wq:
     destroy_workqueue(nvme_fc_wq);
 
     return ret;
 }
 
 static void
 nvme_fc_delete_controllers(struct nvme_fc_rport *rport)
 {
     struct nvme_fc_ctrl *ctrl;
 
     spin_lock(&rport->lock);
     list_for_each_entry(ctrl, &rport->ctrl_list, ctrl_list) {
         dev_warn(ctrl->ctrl.device,
             "NVME-FC{%d}: transport unloading: deleting ctrl\n",
             ctrl->cnum);
         nvme_delete_ctrl(&ctrl->ctrl);
     }
     spin_unlock(&rport->lock);
 }
 
 static void
 nvme_fc_cleanup_for_unload(void)
 {
     struct nvme_fc_lport *lport;
     struct nvme_fc_rport *rport;
 
     list_for_each_entry(lport, &nvme_fc_lport_list, port_list) {
         list_for_each_entry(rport, &lport->endp_list, endp_list) {
             nvme_fc_delete_controllers(rport);
         }
     }
 }
 
 static void __exit nvme_fc_exit_module(void)
 {
     unsigned long flags;
     bool need_cleanup = false;
 
     spin_lock_irqsave(&nvme_fc_lock, flags);
     nvme_fc_waiting_to_unload = true;
     if (!list_empty(&nvme_fc_lport_list)) {
         need_cleanup = true;
         nvme_fc_cleanup_for_unload();
     }
     spin_unlock_irqrestore(&nvme_fc_lock, flags);
     if (need_cleanup) {
         pr_info("%s: waiting for ctlr deletes\n", __func__);
         wait_for_completion(&nvme_fc_unload_proceed);
         pr_info("%s: ctrl deletes complete\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);
     destroy_workqueue(nvme_fc_wq);
 }
 
 module_init(nvme_fc_init_module);
 module_exit(nvme_fc_exit_module);
 
 MODULE_LICENSE("GPL v2");