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linux/drivers/nvme/host/fc.c

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