1 // SPDX-License-Identifier: GPL-2.0
3 * Common code for the NVMe target.
4 * Copyright (c) 2015-2016 HGST, a Western Digital Company.
6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
7 #include <linux/module.h>
8 #include <linux/random.h>
9 #include <linux/rculist.h>
10 #include <linux/pci-p2pdma.h>
11 #include <linux/scatterlist.h>
13 #define CREATE_TRACE_POINTS
18 struct workqueue_struct *buffered_io_wq;
19 struct workqueue_struct *zbd_wq;
20 static const struct nvmet_fabrics_ops *nvmet_transports[NVMF_TRTYPE_MAX];
21 static DEFINE_IDA(cntlid_ida);
24 * This read/write semaphore is used to synchronize access to configuration
25 * information on a target system that will result in discovery log page
26 * information change for at least one host.
27 * The full list of resources to protected by this semaphore is:
30 * - per-subsystem allowed hosts list
31 * - allow_any_host subsystem attribute
33 * - the nvmet_transports array
35 * When updating any of those lists/structures write lock should be obtained,
36 * while when reading (popolating discovery log page or checking host-subsystem
37 * link) read lock is obtained to allow concurrent reads.
39 DECLARE_RWSEM(nvmet_config_sem);
41 u32 nvmet_ana_group_enabled[NVMET_MAX_ANAGRPS + 1];
43 DECLARE_RWSEM(nvmet_ana_sem);
45 inline u16 errno_to_nvme_status(struct nvmet_req *req, int errno)
49 return NVME_SC_SUCCESS;
51 req->error_loc = offsetof(struct nvme_rw_command, length);
52 return NVME_SC_CAP_EXCEEDED | NVME_SC_DNR;
54 req->error_loc = offsetof(struct nvme_rw_command, slba);
55 return NVME_SC_LBA_RANGE | NVME_SC_DNR;
57 req->error_loc = offsetof(struct nvme_common_command, opcode);
58 switch (req->cmd->common.opcode) {
60 case nvme_cmd_write_zeroes:
61 return NVME_SC_ONCS_NOT_SUPPORTED | NVME_SC_DNR;
63 return NVME_SC_INVALID_OPCODE | NVME_SC_DNR;
67 req->error_loc = offsetof(struct nvme_rw_command, nsid);
68 return NVME_SC_ACCESS_DENIED;
72 req->error_loc = offsetof(struct nvme_common_command, opcode);
73 return NVME_SC_INTERNAL | NVME_SC_DNR;
77 u16 nvmet_report_invalid_opcode(struct nvmet_req *req)
79 pr_debug("unhandled cmd %d on qid %d\n", req->cmd->common.opcode,
82 req->error_loc = offsetof(struct nvme_common_command, opcode);
83 return NVME_SC_INVALID_OPCODE | NVME_SC_DNR;
86 static struct nvmet_subsys *nvmet_find_get_subsys(struct nvmet_port *port,
87 const char *subsysnqn);
89 u16 nvmet_copy_to_sgl(struct nvmet_req *req, off_t off, const void *buf,
92 if (sg_pcopy_from_buffer(req->sg, req->sg_cnt, buf, len, off) != len) {
93 req->error_loc = offsetof(struct nvme_common_command, dptr);
94 return NVME_SC_SGL_INVALID_DATA | NVME_SC_DNR;
99 u16 nvmet_copy_from_sgl(struct nvmet_req *req, off_t off, void *buf, size_t len)
101 if (sg_pcopy_to_buffer(req->sg, req->sg_cnt, buf, len, off) != len) {
102 req->error_loc = offsetof(struct nvme_common_command, dptr);
103 return NVME_SC_SGL_INVALID_DATA | NVME_SC_DNR;
108 u16 nvmet_zero_sgl(struct nvmet_req *req, off_t off, size_t len)
110 if (sg_zero_buffer(req->sg, req->sg_cnt, len, off) != len) {
111 req->error_loc = offsetof(struct nvme_common_command, dptr);
112 return NVME_SC_SGL_INVALID_DATA | NVME_SC_DNR;
117 static u32 nvmet_max_nsid(struct nvmet_subsys *subsys)
119 struct nvmet_ns *cur;
123 xa_for_each(&subsys->namespaces, idx, cur)
129 static u32 nvmet_async_event_result(struct nvmet_async_event *aen)
131 return aen->event_type | (aen->event_info << 8) | (aen->log_page << 16);
134 static void nvmet_async_events_failall(struct nvmet_ctrl *ctrl)
136 struct nvmet_req *req;
138 mutex_lock(&ctrl->lock);
139 while (ctrl->nr_async_event_cmds) {
140 req = ctrl->async_event_cmds[--ctrl->nr_async_event_cmds];
141 mutex_unlock(&ctrl->lock);
142 nvmet_req_complete(req, NVME_SC_INTERNAL | NVME_SC_DNR);
143 mutex_lock(&ctrl->lock);
145 mutex_unlock(&ctrl->lock);
148 static void nvmet_async_events_process(struct nvmet_ctrl *ctrl)
150 struct nvmet_async_event *aen;
151 struct nvmet_req *req;
153 mutex_lock(&ctrl->lock);
154 while (ctrl->nr_async_event_cmds && !list_empty(&ctrl->async_events)) {
155 aen = list_first_entry(&ctrl->async_events,
156 struct nvmet_async_event, entry);
157 req = ctrl->async_event_cmds[--ctrl->nr_async_event_cmds];
158 nvmet_set_result(req, nvmet_async_event_result(aen));
160 list_del(&aen->entry);
163 mutex_unlock(&ctrl->lock);
164 trace_nvmet_async_event(ctrl, req->cqe->result.u32);
165 nvmet_req_complete(req, 0);
166 mutex_lock(&ctrl->lock);
168 mutex_unlock(&ctrl->lock);
171 static void nvmet_async_events_free(struct nvmet_ctrl *ctrl)
173 struct nvmet_async_event *aen, *tmp;
175 mutex_lock(&ctrl->lock);
176 list_for_each_entry_safe(aen, tmp, &ctrl->async_events, entry) {
177 list_del(&aen->entry);
180 mutex_unlock(&ctrl->lock);
183 static void nvmet_async_event_work(struct work_struct *work)
185 struct nvmet_ctrl *ctrl =
186 container_of(work, struct nvmet_ctrl, async_event_work);
188 nvmet_async_events_process(ctrl);
191 void nvmet_add_async_event(struct nvmet_ctrl *ctrl, u8 event_type,
192 u8 event_info, u8 log_page)
194 struct nvmet_async_event *aen;
196 aen = kmalloc(sizeof(*aen), GFP_KERNEL);
200 aen->event_type = event_type;
201 aen->event_info = event_info;
202 aen->log_page = log_page;
204 mutex_lock(&ctrl->lock);
205 list_add_tail(&aen->entry, &ctrl->async_events);
206 mutex_unlock(&ctrl->lock);
208 schedule_work(&ctrl->async_event_work);
211 static void nvmet_add_to_changed_ns_log(struct nvmet_ctrl *ctrl, __le32 nsid)
215 mutex_lock(&ctrl->lock);
216 if (ctrl->nr_changed_ns > NVME_MAX_CHANGED_NAMESPACES)
219 for (i = 0; i < ctrl->nr_changed_ns; i++) {
220 if (ctrl->changed_ns_list[i] == nsid)
224 if (ctrl->nr_changed_ns == NVME_MAX_CHANGED_NAMESPACES) {
225 ctrl->changed_ns_list[0] = cpu_to_le32(0xffffffff);
226 ctrl->nr_changed_ns = U32_MAX;
230 ctrl->changed_ns_list[ctrl->nr_changed_ns++] = nsid;
232 mutex_unlock(&ctrl->lock);
235 void nvmet_ns_changed(struct nvmet_subsys *subsys, u32 nsid)
237 struct nvmet_ctrl *ctrl;
239 lockdep_assert_held(&subsys->lock);
241 list_for_each_entry(ctrl, &subsys->ctrls, subsys_entry) {
242 nvmet_add_to_changed_ns_log(ctrl, cpu_to_le32(nsid));
243 if (nvmet_aen_bit_disabled(ctrl, NVME_AEN_BIT_NS_ATTR))
245 nvmet_add_async_event(ctrl, NVME_AER_TYPE_NOTICE,
246 NVME_AER_NOTICE_NS_CHANGED,
247 NVME_LOG_CHANGED_NS);
251 void nvmet_send_ana_event(struct nvmet_subsys *subsys,
252 struct nvmet_port *port)
254 struct nvmet_ctrl *ctrl;
256 mutex_lock(&subsys->lock);
257 list_for_each_entry(ctrl, &subsys->ctrls, subsys_entry) {
258 if (port && ctrl->port != port)
260 if (nvmet_aen_bit_disabled(ctrl, NVME_AEN_BIT_ANA_CHANGE))
262 nvmet_add_async_event(ctrl, NVME_AER_TYPE_NOTICE,
263 NVME_AER_NOTICE_ANA, NVME_LOG_ANA);
265 mutex_unlock(&subsys->lock);
268 void nvmet_port_send_ana_event(struct nvmet_port *port)
270 struct nvmet_subsys_link *p;
272 down_read(&nvmet_config_sem);
273 list_for_each_entry(p, &port->subsystems, entry)
274 nvmet_send_ana_event(p->subsys, port);
275 up_read(&nvmet_config_sem);
278 int nvmet_register_transport(const struct nvmet_fabrics_ops *ops)
282 down_write(&nvmet_config_sem);
283 if (nvmet_transports[ops->type])
286 nvmet_transports[ops->type] = ops;
287 up_write(&nvmet_config_sem);
291 EXPORT_SYMBOL_GPL(nvmet_register_transport);
293 void nvmet_unregister_transport(const struct nvmet_fabrics_ops *ops)
295 down_write(&nvmet_config_sem);
296 nvmet_transports[ops->type] = NULL;
297 up_write(&nvmet_config_sem);
299 EXPORT_SYMBOL_GPL(nvmet_unregister_transport);
301 void nvmet_port_del_ctrls(struct nvmet_port *port, struct nvmet_subsys *subsys)
303 struct nvmet_ctrl *ctrl;
305 mutex_lock(&subsys->lock);
306 list_for_each_entry(ctrl, &subsys->ctrls, subsys_entry) {
307 if (ctrl->port == port)
308 ctrl->ops->delete_ctrl(ctrl);
310 mutex_unlock(&subsys->lock);
313 int nvmet_enable_port(struct nvmet_port *port)
315 const struct nvmet_fabrics_ops *ops;
318 lockdep_assert_held(&nvmet_config_sem);
320 ops = nvmet_transports[port->disc_addr.trtype];
322 up_write(&nvmet_config_sem);
323 request_module("nvmet-transport-%d", port->disc_addr.trtype);
324 down_write(&nvmet_config_sem);
325 ops = nvmet_transports[port->disc_addr.trtype];
327 pr_err("transport type %d not supported\n",
328 port->disc_addr.trtype);
333 if (!try_module_get(ops->owner))
337 * If the user requested PI support and the transport isn't pi capable,
338 * don't enable the port.
340 if (port->pi_enable && !(ops->flags & NVMF_METADATA_SUPPORTED)) {
341 pr_err("T10-PI is not supported by transport type %d\n",
342 port->disc_addr.trtype);
347 ret = ops->add_port(port);
351 /* If the transport didn't set inline_data_size, then disable it. */
352 if (port->inline_data_size < 0)
353 port->inline_data_size = 0;
355 port->enabled = true;
360 module_put(ops->owner);
364 void nvmet_disable_port(struct nvmet_port *port)
366 const struct nvmet_fabrics_ops *ops;
368 lockdep_assert_held(&nvmet_config_sem);
370 port->enabled = false;
373 ops = nvmet_transports[port->disc_addr.trtype];
374 ops->remove_port(port);
375 module_put(ops->owner);
378 static void nvmet_keep_alive_timer(struct work_struct *work)
380 struct nvmet_ctrl *ctrl = container_of(to_delayed_work(work),
381 struct nvmet_ctrl, ka_work);
382 bool reset_tbkas = ctrl->reset_tbkas;
384 ctrl->reset_tbkas = false;
386 pr_debug("ctrl %d reschedule traffic based keep-alive timer\n",
388 schedule_delayed_work(&ctrl->ka_work, ctrl->kato * HZ);
392 pr_err("ctrl %d keep-alive timer (%d seconds) expired!\n",
393 ctrl->cntlid, ctrl->kato);
395 nvmet_ctrl_fatal_error(ctrl);
398 void nvmet_start_keep_alive_timer(struct nvmet_ctrl *ctrl)
400 if (unlikely(ctrl->kato == 0))
403 pr_debug("ctrl %d start keep-alive timer for %d secs\n",
404 ctrl->cntlid, ctrl->kato);
406 schedule_delayed_work(&ctrl->ka_work, ctrl->kato * HZ);
409 void nvmet_stop_keep_alive_timer(struct nvmet_ctrl *ctrl)
411 if (unlikely(ctrl->kato == 0))
414 pr_debug("ctrl %d stop keep-alive\n", ctrl->cntlid);
416 cancel_delayed_work_sync(&ctrl->ka_work);
419 u16 nvmet_req_find_ns(struct nvmet_req *req)
421 u32 nsid = le32_to_cpu(req->cmd->common.nsid);
423 req->ns = xa_load(&nvmet_req_subsys(req)->namespaces, nsid);
424 if (unlikely(!req->ns)) {
425 req->error_loc = offsetof(struct nvme_common_command, nsid);
426 return NVME_SC_INVALID_NS | NVME_SC_DNR;
429 percpu_ref_get(&req->ns->ref);
430 return NVME_SC_SUCCESS;
433 static void nvmet_destroy_namespace(struct percpu_ref *ref)
435 struct nvmet_ns *ns = container_of(ref, struct nvmet_ns, ref);
437 complete(&ns->disable_done);
440 void nvmet_put_namespace(struct nvmet_ns *ns)
442 percpu_ref_put(&ns->ref);
445 static void nvmet_ns_dev_disable(struct nvmet_ns *ns)
447 nvmet_bdev_ns_disable(ns);
448 nvmet_file_ns_disable(ns);
451 static int nvmet_p2pmem_ns_enable(struct nvmet_ns *ns)
454 struct pci_dev *p2p_dev;
460 pr_err("peer-to-peer DMA is not supported by non-block device namespaces\n");
464 if (!blk_queue_pci_p2pdma(ns->bdev->bd_disk->queue)) {
465 pr_err("peer-to-peer DMA is not supported by the driver of %s\n",
471 ret = pci_p2pdma_distance(ns->p2p_dev, nvmet_ns_dev(ns), true);
476 * Right now we just check that there is p2pmem available so
477 * we can report an error to the user right away if there
478 * is not. We'll find the actual device to use once we
479 * setup the controller when the port's device is available.
482 p2p_dev = pci_p2pmem_find(nvmet_ns_dev(ns));
484 pr_err("no peer-to-peer memory is available for %s\n",
489 pci_dev_put(p2p_dev);
496 * Note: ctrl->subsys->lock should be held when calling this function
498 static void nvmet_p2pmem_ns_add_p2p(struct nvmet_ctrl *ctrl,
501 struct device *clients[2];
502 struct pci_dev *p2p_dev;
505 if (!ctrl->p2p_client || !ns->use_p2pmem)
509 ret = pci_p2pdma_distance(ns->p2p_dev, ctrl->p2p_client, true);
513 p2p_dev = pci_dev_get(ns->p2p_dev);
515 clients[0] = ctrl->p2p_client;
516 clients[1] = nvmet_ns_dev(ns);
518 p2p_dev = pci_p2pmem_find_many(clients, ARRAY_SIZE(clients));
520 pr_err("no peer-to-peer memory is available that's supported by %s and %s\n",
521 dev_name(ctrl->p2p_client), ns->device_path);
526 ret = radix_tree_insert(&ctrl->p2p_ns_map, ns->nsid, p2p_dev);
528 pci_dev_put(p2p_dev);
530 pr_info("using p2pmem on %s for nsid %d\n", pci_name(p2p_dev),
534 void nvmet_ns_revalidate(struct nvmet_ns *ns)
536 loff_t oldsize = ns->size;
539 nvmet_bdev_ns_revalidate(ns);
541 nvmet_file_ns_revalidate(ns);
543 if (oldsize != ns->size)
544 nvmet_ns_changed(ns->subsys, ns->nsid);
547 int nvmet_ns_enable(struct nvmet_ns *ns)
549 struct nvmet_subsys *subsys = ns->subsys;
550 struct nvmet_ctrl *ctrl;
553 mutex_lock(&subsys->lock);
556 if (nvmet_passthru_ctrl(subsys)) {
557 pr_info("cannot enable both passthru and regular namespaces for a single subsystem");
565 if (subsys->nr_namespaces == NVMET_MAX_NAMESPACES)
568 ret = nvmet_bdev_ns_enable(ns);
570 ret = nvmet_file_ns_enable(ns);
574 ret = nvmet_p2pmem_ns_enable(ns);
576 goto out_dev_disable;
578 list_for_each_entry(ctrl, &subsys->ctrls, subsys_entry)
579 nvmet_p2pmem_ns_add_p2p(ctrl, ns);
581 ret = percpu_ref_init(&ns->ref, nvmet_destroy_namespace,
586 if (ns->nsid > subsys->max_nsid)
587 subsys->max_nsid = ns->nsid;
589 ret = xa_insert(&subsys->namespaces, ns->nsid, ns, GFP_KERNEL);
591 goto out_restore_subsys_maxnsid;
593 subsys->nr_namespaces++;
595 nvmet_ns_changed(subsys, ns->nsid);
599 mutex_unlock(&subsys->lock);
602 out_restore_subsys_maxnsid:
603 subsys->max_nsid = nvmet_max_nsid(subsys);
604 percpu_ref_exit(&ns->ref);
606 list_for_each_entry(ctrl, &subsys->ctrls, subsys_entry)
607 pci_dev_put(radix_tree_delete(&ctrl->p2p_ns_map, ns->nsid));
609 nvmet_ns_dev_disable(ns);
613 void nvmet_ns_disable(struct nvmet_ns *ns)
615 struct nvmet_subsys *subsys = ns->subsys;
616 struct nvmet_ctrl *ctrl;
618 mutex_lock(&subsys->lock);
623 xa_erase(&ns->subsys->namespaces, ns->nsid);
624 if (ns->nsid == subsys->max_nsid)
625 subsys->max_nsid = nvmet_max_nsid(subsys);
627 list_for_each_entry(ctrl, &subsys->ctrls, subsys_entry)
628 pci_dev_put(radix_tree_delete(&ctrl->p2p_ns_map, ns->nsid));
630 mutex_unlock(&subsys->lock);
633 * Now that we removed the namespaces from the lookup list, we
634 * can kill the per_cpu ref and wait for any remaining references
635 * to be dropped, as well as a RCU grace period for anyone only
636 * using the namepace under rcu_read_lock(). Note that we can't
637 * use call_rcu here as we need to ensure the namespaces have
638 * been fully destroyed before unloading the module.
640 percpu_ref_kill(&ns->ref);
642 wait_for_completion(&ns->disable_done);
643 percpu_ref_exit(&ns->ref);
645 mutex_lock(&subsys->lock);
647 subsys->nr_namespaces--;
648 nvmet_ns_changed(subsys, ns->nsid);
649 nvmet_ns_dev_disable(ns);
651 mutex_unlock(&subsys->lock);
654 void nvmet_ns_free(struct nvmet_ns *ns)
656 nvmet_ns_disable(ns);
658 down_write(&nvmet_ana_sem);
659 nvmet_ana_group_enabled[ns->anagrpid]--;
660 up_write(&nvmet_ana_sem);
662 kfree(ns->device_path);
666 struct nvmet_ns *nvmet_ns_alloc(struct nvmet_subsys *subsys, u32 nsid)
670 ns = kzalloc(sizeof(*ns), GFP_KERNEL);
674 init_completion(&ns->disable_done);
679 down_write(&nvmet_ana_sem);
680 ns->anagrpid = NVMET_DEFAULT_ANA_GRPID;
681 nvmet_ana_group_enabled[ns->anagrpid]++;
682 up_write(&nvmet_ana_sem);
685 ns->buffered_io = false;
686 ns->csi = NVME_CSI_NVM;
691 static void nvmet_update_sq_head(struct nvmet_req *req)
694 u32 old_sqhd, new_sqhd;
697 old_sqhd = req->sq->sqhd;
698 new_sqhd = (old_sqhd + 1) % req->sq->size;
699 } while (cmpxchg(&req->sq->sqhd, old_sqhd, new_sqhd) !=
702 req->cqe->sq_head = cpu_to_le16(req->sq->sqhd & 0x0000FFFF);
705 static void nvmet_set_error(struct nvmet_req *req, u16 status)
707 struct nvmet_ctrl *ctrl = req->sq->ctrl;
708 struct nvme_error_slot *new_error_slot;
711 req->cqe->status = cpu_to_le16(status << 1);
713 if (!ctrl || req->error_loc == NVMET_NO_ERROR_LOC)
716 spin_lock_irqsave(&ctrl->error_lock, flags);
719 &ctrl->slots[ctrl->err_counter % NVMET_ERROR_LOG_SLOTS];
721 new_error_slot->error_count = cpu_to_le64(ctrl->err_counter);
722 new_error_slot->sqid = cpu_to_le16(req->sq->qid);
723 new_error_slot->cmdid = cpu_to_le16(req->cmd->common.command_id);
724 new_error_slot->status_field = cpu_to_le16(status << 1);
725 new_error_slot->param_error_location = cpu_to_le16(req->error_loc);
726 new_error_slot->lba = cpu_to_le64(req->error_slba);
727 new_error_slot->nsid = req->cmd->common.nsid;
728 spin_unlock_irqrestore(&ctrl->error_lock, flags);
730 /* set the more bit for this request */
731 req->cqe->status |= cpu_to_le16(1 << 14);
734 static void __nvmet_req_complete(struct nvmet_req *req, u16 status)
736 if (!req->sq->sqhd_disabled)
737 nvmet_update_sq_head(req);
738 req->cqe->sq_id = cpu_to_le16(req->sq->qid);
739 req->cqe->command_id = req->cmd->common.command_id;
741 if (unlikely(status))
742 nvmet_set_error(req, status);
744 trace_nvmet_req_complete(req);
747 nvmet_put_namespace(req->ns);
748 req->ops->queue_response(req);
751 void nvmet_req_complete(struct nvmet_req *req, u16 status)
753 __nvmet_req_complete(req, status);
754 percpu_ref_put(&req->sq->ref);
756 EXPORT_SYMBOL_GPL(nvmet_req_complete);
758 void nvmet_cq_setup(struct nvmet_ctrl *ctrl, struct nvmet_cq *cq,
765 void nvmet_sq_setup(struct nvmet_ctrl *ctrl, struct nvmet_sq *sq,
775 static void nvmet_confirm_sq(struct percpu_ref *ref)
777 struct nvmet_sq *sq = container_of(ref, struct nvmet_sq, ref);
779 complete(&sq->confirm_done);
782 void nvmet_sq_destroy(struct nvmet_sq *sq)
784 struct nvmet_ctrl *ctrl = sq->ctrl;
787 * If this is the admin queue, complete all AERs so that our
788 * queue doesn't have outstanding requests on it.
790 if (ctrl && ctrl->sqs && ctrl->sqs[0] == sq)
791 nvmet_async_events_failall(ctrl);
792 percpu_ref_kill_and_confirm(&sq->ref, nvmet_confirm_sq);
793 wait_for_completion(&sq->confirm_done);
794 wait_for_completion(&sq->free_done);
795 percpu_ref_exit(&sq->ref);
799 * The teardown flow may take some time, and the host may not
800 * send us keep-alive during this period, hence reset the
801 * traffic based keep-alive timer so we don't trigger a
802 * controller teardown as a result of a keep-alive expiration.
804 ctrl->reset_tbkas = true;
805 nvmet_ctrl_put(ctrl);
806 sq->ctrl = NULL; /* allows reusing the queue later */
809 EXPORT_SYMBOL_GPL(nvmet_sq_destroy);
811 static void nvmet_sq_free(struct percpu_ref *ref)
813 struct nvmet_sq *sq = container_of(ref, struct nvmet_sq, ref);
815 complete(&sq->free_done);
818 int nvmet_sq_init(struct nvmet_sq *sq)
822 ret = percpu_ref_init(&sq->ref, nvmet_sq_free, 0, GFP_KERNEL);
824 pr_err("percpu_ref init failed!\n");
827 init_completion(&sq->free_done);
828 init_completion(&sq->confirm_done);
832 EXPORT_SYMBOL_GPL(nvmet_sq_init);
834 static inline u16 nvmet_check_ana_state(struct nvmet_port *port,
837 enum nvme_ana_state state = port->ana_state[ns->anagrpid];
839 if (unlikely(state == NVME_ANA_INACCESSIBLE))
840 return NVME_SC_ANA_INACCESSIBLE;
841 if (unlikely(state == NVME_ANA_PERSISTENT_LOSS))
842 return NVME_SC_ANA_PERSISTENT_LOSS;
843 if (unlikely(state == NVME_ANA_CHANGE))
844 return NVME_SC_ANA_TRANSITION;
848 static inline u16 nvmet_io_cmd_check_access(struct nvmet_req *req)
850 if (unlikely(req->ns->readonly)) {
851 switch (req->cmd->common.opcode) {
856 return NVME_SC_NS_WRITE_PROTECTED;
863 static u16 nvmet_parse_io_cmd(struct nvmet_req *req)
867 ret = nvmet_check_ctrl_status(req);
871 if (nvmet_req_passthru_ctrl(req))
872 return nvmet_parse_passthru_io_cmd(req);
874 ret = nvmet_req_find_ns(req);
878 ret = nvmet_check_ana_state(req->port, req->ns);
880 req->error_loc = offsetof(struct nvme_common_command, nsid);
883 ret = nvmet_io_cmd_check_access(req);
885 req->error_loc = offsetof(struct nvme_common_command, nsid);
889 switch (req->ns->csi) {
892 return nvmet_file_parse_io_cmd(req);
893 return nvmet_bdev_parse_io_cmd(req);
895 if (IS_ENABLED(CONFIG_BLK_DEV_ZONED))
896 return nvmet_bdev_zns_parse_io_cmd(req);
897 return NVME_SC_INVALID_IO_CMD_SET;
899 return NVME_SC_INVALID_IO_CMD_SET;
903 bool nvmet_req_init(struct nvmet_req *req, struct nvmet_cq *cq,
904 struct nvmet_sq *sq, const struct nvmet_fabrics_ops *ops)
906 u8 flags = req->cmd->common.flags;
913 req->metadata_sg = NULL;
915 req->metadata_sg_cnt = 0;
916 req->transfer_len = 0;
917 req->metadata_len = 0;
918 req->cqe->status = 0;
919 req->cqe->sq_head = 0;
921 req->error_loc = NVMET_NO_ERROR_LOC;
924 /* no support for fused commands yet */
925 if (unlikely(flags & (NVME_CMD_FUSE_FIRST | NVME_CMD_FUSE_SECOND))) {
926 req->error_loc = offsetof(struct nvme_common_command, flags);
927 status = NVME_SC_INVALID_FIELD | NVME_SC_DNR;
932 * For fabrics, PSDT field shall describe metadata pointer (MPTR) that
933 * contains an address of a single contiguous physical buffer that is
936 if (unlikely((flags & NVME_CMD_SGL_ALL) != NVME_CMD_SGL_METABUF)) {
937 req->error_loc = offsetof(struct nvme_common_command, flags);
938 status = NVME_SC_INVALID_FIELD | NVME_SC_DNR;
942 if (unlikely(!req->sq->ctrl))
943 /* will return an error for any non-connect command: */
944 status = nvmet_parse_connect_cmd(req);
945 else if (likely(req->sq->qid != 0))
946 status = nvmet_parse_io_cmd(req);
948 status = nvmet_parse_admin_cmd(req);
953 trace_nvmet_req_init(req, req->cmd);
955 if (unlikely(!percpu_ref_tryget_live(&sq->ref))) {
956 status = NVME_SC_INVALID_FIELD | NVME_SC_DNR;
961 sq->ctrl->reset_tbkas = true;
966 __nvmet_req_complete(req, status);
969 EXPORT_SYMBOL_GPL(nvmet_req_init);
971 void nvmet_req_uninit(struct nvmet_req *req)
973 percpu_ref_put(&req->sq->ref);
975 nvmet_put_namespace(req->ns);
977 EXPORT_SYMBOL_GPL(nvmet_req_uninit);
979 bool nvmet_check_transfer_len(struct nvmet_req *req, size_t len)
981 if (unlikely(len != req->transfer_len)) {
982 req->error_loc = offsetof(struct nvme_common_command, dptr);
983 nvmet_req_complete(req, NVME_SC_SGL_INVALID_DATA | NVME_SC_DNR);
989 EXPORT_SYMBOL_GPL(nvmet_check_transfer_len);
991 bool nvmet_check_data_len_lte(struct nvmet_req *req, size_t data_len)
993 if (unlikely(data_len > req->transfer_len)) {
994 req->error_loc = offsetof(struct nvme_common_command, dptr);
995 nvmet_req_complete(req, NVME_SC_SGL_INVALID_DATA | NVME_SC_DNR);
1002 static unsigned int nvmet_data_transfer_len(struct nvmet_req *req)
1004 return req->transfer_len - req->metadata_len;
1007 static int nvmet_req_alloc_p2pmem_sgls(struct pci_dev *p2p_dev,
1008 struct nvmet_req *req)
1010 req->sg = pci_p2pmem_alloc_sgl(p2p_dev, &req->sg_cnt,
1011 nvmet_data_transfer_len(req));
1015 if (req->metadata_len) {
1016 req->metadata_sg = pci_p2pmem_alloc_sgl(p2p_dev,
1017 &req->metadata_sg_cnt, req->metadata_len);
1018 if (!req->metadata_sg)
1022 req->p2p_dev = p2p_dev;
1026 pci_p2pmem_free_sgl(req->p2p_dev, req->sg);
1031 static struct pci_dev *nvmet_req_find_p2p_dev(struct nvmet_req *req)
1033 if (!IS_ENABLED(CONFIG_PCI_P2PDMA) ||
1034 !req->sq->ctrl || !req->sq->qid || !req->ns)
1036 return radix_tree_lookup(&req->sq->ctrl->p2p_ns_map, req->ns->nsid);
1039 int nvmet_req_alloc_sgls(struct nvmet_req *req)
1041 struct pci_dev *p2p_dev = nvmet_req_find_p2p_dev(req);
1043 if (p2p_dev && !nvmet_req_alloc_p2pmem_sgls(p2p_dev, req))
1046 req->sg = sgl_alloc(nvmet_data_transfer_len(req), GFP_KERNEL,
1048 if (unlikely(!req->sg))
1051 if (req->metadata_len) {
1052 req->metadata_sg = sgl_alloc(req->metadata_len, GFP_KERNEL,
1053 &req->metadata_sg_cnt);
1054 if (unlikely(!req->metadata_sg))
1064 EXPORT_SYMBOL_GPL(nvmet_req_alloc_sgls);
1066 void nvmet_req_free_sgls(struct nvmet_req *req)
1069 pci_p2pmem_free_sgl(req->p2p_dev, req->sg);
1070 if (req->metadata_sg)
1071 pci_p2pmem_free_sgl(req->p2p_dev, req->metadata_sg);
1072 req->p2p_dev = NULL;
1075 if (req->metadata_sg)
1076 sgl_free(req->metadata_sg);
1080 req->metadata_sg = NULL;
1082 req->metadata_sg_cnt = 0;
1084 EXPORT_SYMBOL_GPL(nvmet_req_free_sgls);
1086 static inline bool nvmet_cc_en(u32 cc)
1088 return (cc >> NVME_CC_EN_SHIFT) & 0x1;
1091 static inline u8 nvmet_cc_css(u32 cc)
1093 return (cc >> NVME_CC_CSS_SHIFT) & 0x7;
1096 static inline u8 nvmet_cc_mps(u32 cc)
1098 return (cc >> NVME_CC_MPS_SHIFT) & 0xf;
1101 static inline u8 nvmet_cc_ams(u32 cc)
1103 return (cc >> NVME_CC_AMS_SHIFT) & 0x7;
1106 static inline u8 nvmet_cc_shn(u32 cc)
1108 return (cc >> NVME_CC_SHN_SHIFT) & 0x3;
1111 static inline u8 nvmet_cc_iosqes(u32 cc)
1113 return (cc >> NVME_CC_IOSQES_SHIFT) & 0xf;
1116 static inline u8 nvmet_cc_iocqes(u32 cc)
1118 return (cc >> NVME_CC_IOCQES_SHIFT) & 0xf;
1121 static inline bool nvmet_css_supported(u8 cc_css)
1123 switch (cc_css <<= NVME_CC_CSS_SHIFT) {
1124 case NVME_CC_CSS_NVM:
1125 case NVME_CC_CSS_CSI:
1132 static void nvmet_start_ctrl(struct nvmet_ctrl *ctrl)
1134 lockdep_assert_held(&ctrl->lock);
1137 * Only I/O controllers should verify iosqes,iocqes.
1138 * Strictly speaking, the spec says a discovery controller
1139 * should verify iosqes,iocqes are zeroed, however that
1140 * would break backwards compatibility, so don't enforce it.
1142 if (ctrl->subsys->type != NVME_NQN_DISC &&
1143 (nvmet_cc_iosqes(ctrl->cc) != NVME_NVM_IOSQES ||
1144 nvmet_cc_iocqes(ctrl->cc) != NVME_NVM_IOCQES)) {
1145 ctrl->csts = NVME_CSTS_CFS;
1149 if (nvmet_cc_mps(ctrl->cc) != 0 ||
1150 nvmet_cc_ams(ctrl->cc) != 0 ||
1151 !nvmet_css_supported(nvmet_cc_css(ctrl->cc))) {
1152 ctrl->csts = NVME_CSTS_CFS;
1156 ctrl->csts = NVME_CSTS_RDY;
1159 * Controllers that are not yet enabled should not really enforce the
1160 * keep alive timeout, but we still want to track a timeout and cleanup
1161 * in case a host died before it enabled the controller. Hence, simply
1162 * reset the keep alive timer when the controller is enabled.
1165 mod_delayed_work(system_wq, &ctrl->ka_work, ctrl->kato * HZ);
1168 static void nvmet_clear_ctrl(struct nvmet_ctrl *ctrl)
1170 lockdep_assert_held(&ctrl->lock);
1172 /* XXX: tear down queues? */
1173 ctrl->csts &= ~NVME_CSTS_RDY;
1177 void nvmet_update_cc(struct nvmet_ctrl *ctrl, u32 new)
1181 mutex_lock(&ctrl->lock);
1185 if (nvmet_cc_en(new) && !nvmet_cc_en(old))
1186 nvmet_start_ctrl(ctrl);
1187 if (!nvmet_cc_en(new) && nvmet_cc_en(old))
1188 nvmet_clear_ctrl(ctrl);
1189 if (nvmet_cc_shn(new) && !nvmet_cc_shn(old)) {
1190 nvmet_clear_ctrl(ctrl);
1191 ctrl->csts |= NVME_CSTS_SHST_CMPLT;
1193 if (!nvmet_cc_shn(new) && nvmet_cc_shn(old))
1194 ctrl->csts &= ~NVME_CSTS_SHST_CMPLT;
1195 mutex_unlock(&ctrl->lock);
1198 static void nvmet_init_cap(struct nvmet_ctrl *ctrl)
1200 /* command sets supported: NVMe command set: */
1201 ctrl->cap = (1ULL << 37);
1202 /* Controller supports one or more I/O Command Sets */
1203 ctrl->cap |= (1ULL << 43);
1204 /* CC.EN timeout in 500msec units: */
1205 ctrl->cap |= (15ULL << 24);
1206 /* maximum queue entries supported: */
1207 ctrl->cap |= NVMET_QUEUE_SIZE - 1;
1210 struct nvmet_ctrl *nvmet_ctrl_find_get(const char *subsysnqn,
1211 const char *hostnqn, u16 cntlid,
1212 struct nvmet_req *req)
1214 struct nvmet_ctrl *ctrl = NULL;
1215 struct nvmet_subsys *subsys;
1217 subsys = nvmet_find_get_subsys(req->port, subsysnqn);
1219 pr_warn("connect request for invalid subsystem %s!\n",
1221 req->cqe->result.u32 = IPO_IATTR_CONNECT_DATA(subsysnqn);
1225 mutex_lock(&subsys->lock);
1226 list_for_each_entry(ctrl, &subsys->ctrls, subsys_entry) {
1227 if (ctrl->cntlid == cntlid) {
1228 if (strncmp(hostnqn, ctrl->hostnqn, NVMF_NQN_SIZE)) {
1229 pr_warn("hostnqn mismatch.\n");
1232 if (!kref_get_unless_zero(&ctrl->ref))
1240 ctrl = NULL; /* ctrl not found */
1241 pr_warn("could not find controller %d for subsys %s / host %s\n",
1242 cntlid, subsysnqn, hostnqn);
1243 req->cqe->result.u32 = IPO_IATTR_CONNECT_DATA(cntlid);
1246 mutex_unlock(&subsys->lock);
1247 nvmet_subsys_put(subsys);
1252 u16 nvmet_check_ctrl_status(struct nvmet_req *req)
1254 if (unlikely(!(req->sq->ctrl->cc & NVME_CC_ENABLE))) {
1255 pr_err("got cmd %d while CC.EN == 0 on qid = %d\n",
1256 req->cmd->common.opcode, req->sq->qid);
1257 return NVME_SC_CMD_SEQ_ERROR | NVME_SC_DNR;
1260 if (unlikely(!(req->sq->ctrl->csts & NVME_CSTS_RDY))) {
1261 pr_err("got cmd %d while CSTS.RDY == 0 on qid = %d\n",
1262 req->cmd->common.opcode, req->sq->qid);
1263 return NVME_SC_CMD_SEQ_ERROR | NVME_SC_DNR;
1268 bool nvmet_host_allowed(struct nvmet_subsys *subsys, const char *hostnqn)
1270 struct nvmet_host_link *p;
1272 lockdep_assert_held(&nvmet_config_sem);
1274 if (subsys->allow_any_host)
1277 if (subsys->type == NVME_NQN_DISC) /* allow all access to disc subsys */
1280 list_for_each_entry(p, &subsys->hosts, entry) {
1281 if (!strcmp(nvmet_host_name(p->host), hostnqn))
1289 * Note: ctrl->subsys->lock should be held when calling this function
1291 static void nvmet_setup_p2p_ns_map(struct nvmet_ctrl *ctrl,
1292 struct nvmet_req *req)
1294 struct nvmet_ns *ns;
1297 if (!req->p2p_client)
1300 ctrl->p2p_client = get_device(req->p2p_client);
1302 xa_for_each(&ctrl->subsys->namespaces, idx, ns)
1303 nvmet_p2pmem_ns_add_p2p(ctrl, ns);
1307 * Note: ctrl->subsys->lock should be held when calling this function
1309 static void nvmet_release_p2p_ns_map(struct nvmet_ctrl *ctrl)
1311 struct radix_tree_iter iter;
1314 radix_tree_for_each_slot(slot, &ctrl->p2p_ns_map, &iter, 0)
1315 pci_dev_put(radix_tree_deref_slot(slot));
1317 put_device(ctrl->p2p_client);
1320 static void nvmet_fatal_error_handler(struct work_struct *work)
1322 struct nvmet_ctrl *ctrl =
1323 container_of(work, struct nvmet_ctrl, fatal_err_work);
1325 pr_err("ctrl %d fatal error occurred!\n", ctrl->cntlid);
1326 ctrl->ops->delete_ctrl(ctrl);
1329 u16 nvmet_alloc_ctrl(const char *subsysnqn, const char *hostnqn,
1330 struct nvmet_req *req, u32 kato, struct nvmet_ctrl **ctrlp)
1332 struct nvmet_subsys *subsys;
1333 struct nvmet_ctrl *ctrl;
1337 status = NVME_SC_CONNECT_INVALID_PARAM | NVME_SC_DNR;
1338 subsys = nvmet_find_get_subsys(req->port, subsysnqn);
1340 pr_warn("connect request for invalid subsystem %s!\n",
1342 req->cqe->result.u32 = IPO_IATTR_CONNECT_DATA(subsysnqn);
1343 req->error_loc = offsetof(struct nvme_common_command, dptr);
1347 down_read(&nvmet_config_sem);
1348 if (!nvmet_host_allowed(subsys, hostnqn)) {
1349 pr_info("connect by host %s for subsystem %s not allowed\n",
1350 hostnqn, subsysnqn);
1351 req->cqe->result.u32 = IPO_IATTR_CONNECT_DATA(hostnqn);
1352 up_read(&nvmet_config_sem);
1353 status = NVME_SC_CONNECT_INVALID_HOST | NVME_SC_DNR;
1354 req->error_loc = offsetof(struct nvme_common_command, dptr);
1355 goto out_put_subsystem;
1357 up_read(&nvmet_config_sem);
1359 status = NVME_SC_INTERNAL;
1360 ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
1362 goto out_put_subsystem;
1363 mutex_init(&ctrl->lock);
1365 nvmet_init_cap(ctrl);
1367 ctrl->port = req->port;
1369 INIT_WORK(&ctrl->async_event_work, nvmet_async_event_work);
1370 INIT_LIST_HEAD(&ctrl->async_events);
1371 INIT_RADIX_TREE(&ctrl->p2p_ns_map, GFP_KERNEL);
1372 INIT_WORK(&ctrl->fatal_err_work, nvmet_fatal_error_handler);
1373 INIT_DELAYED_WORK(&ctrl->ka_work, nvmet_keep_alive_timer);
1375 memcpy(ctrl->subsysnqn, subsysnqn, NVMF_NQN_SIZE);
1376 memcpy(ctrl->hostnqn, hostnqn, NVMF_NQN_SIZE);
1378 kref_init(&ctrl->ref);
1379 ctrl->subsys = subsys;
1380 WRITE_ONCE(ctrl->aen_enabled, NVMET_AEN_CFG_OPTIONAL);
1382 ctrl->changed_ns_list = kmalloc_array(NVME_MAX_CHANGED_NAMESPACES,
1383 sizeof(__le32), GFP_KERNEL);
1384 if (!ctrl->changed_ns_list)
1387 ctrl->sqs = kcalloc(subsys->max_qid + 1,
1388 sizeof(struct nvmet_sq *),
1391 goto out_free_changed_ns_list;
1393 if (subsys->cntlid_min > subsys->cntlid_max)
1396 ret = ida_simple_get(&cntlid_ida,
1397 subsys->cntlid_min, subsys->cntlid_max,
1400 status = NVME_SC_CONNECT_CTRL_BUSY | NVME_SC_DNR;
1405 ctrl->ops = req->ops;
1408 * Discovery controllers may use some arbitrary high value
1409 * in order to cleanup stale discovery sessions
1411 if ((ctrl->subsys->type == NVME_NQN_DISC) && !kato)
1412 kato = NVMET_DISC_KATO_MS;
1414 /* keep-alive timeout in seconds */
1415 ctrl->kato = DIV_ROUND_UP(kato, 1000);
1417 ctrl->err_counter = 0;
1418 spin_lock_init(&ctrl->error_lock);
1420 nvmet_start_keep_alive_timer(ctrl);
1422 mutex_lock(&subsys->lock);
1423 list_add_tail(&ctrl->subsys_entry, &subsys->ctrls);
1424 nvmet_setup_p2p_ns_map(ctrl, req);
1425 mutex_unlock(&subsys->lock);
1432 out_free_changed_ns_list:
1433 kfree(ctrl->changed_ns_list);
1437 nvmet_subsys_put(subsys);
1442 static void nvmet_ctrl_free(struct kref *ref)
1444 struct nvmet_ctrl *ctrl = container_of(ref, struct nvmet_ctrl, ref);
1445 struct nvmet_subsys *subsys = ctrl->subsys;
1447 mutex_lock(&subsys->lock);
1448 nvmet_release_p2p_ns_map(ctrl);
1449 list_del(&ctrl->subsys_entry);
1450 mutex_unlock(&subsys->lock);
1452 nvmet_stop_keep_alive_timer(ctrl);
1454 flush_work(&ctrl->async_event_work);
1455 cancel_work_sync(&ctrl->fatal_err_work);
1457 ida_simple_remove(&cntlid_ida, ctrl->cntlid);
1459 nvmet_async_events_free(ctrl);
1461 kfree(ctrl->changed_ns_list);
1464 nvmet_subsys_put(subsys);
1467 void nvmet_ctrl_put(struct nvmet_ctrl *ctrl)
1469 kref_put(&ctrl->ref, nvmet_ctrl_free);
1472 void nvmet_ctrl_fatal_error(struct nvmet_ctrl *ctrl)
1474 mutex_lock(&ctrl->lock);
1475 if (!(ctrl->csts & NVME_CSTS_CFS)) {
1476 ctrl->csts |= NVME_CSTS_CFS;
1477 schedule_work(&ctrl->fatal_err_work);
1479 mutex_unlock(&ctrl->lock);
1481 EXPORT_SYMBOL_GPL(nvmet_ctrl_fatal_error);
1483 static struct nvmet_subsys *nvmet_find_get_subsys(struct nvmet_port *port,
1484 const char *subsysnqn)
1486 struct nvmet_subsys_link *p;
1491 if (!strcmp(NVME_DISC_SUBSYS_NAME, subsysnqn)) {
1492 if (!kref_get_unless_zero(&nvmet_disc_subsys->ref))
1494 return nvmet_disc_subsys;
1497 down_read(&nvmet_config_sem);
1498 list_for_each_entry(p, &port->subsystems, entry) {
1499 if (!strncmp(p->subsys->subsysnqn, subsysnqn,
1501 if (!kref_get_unless_zero(&p->subsys->ref))
1503 up_read(&nvmet_config_sem);
1507 up_read(&nvmet_config_sem);
1511 struct nvmet_subsys *nvmet_subsys_alloc(const char *subsysnqn,
1512 enum nvme_subsys_type type)
1514 struct nvmet_subsys *subsys;
1515 char serial[NVMET_SN_MAX_SIZE / 2];
1518 subsys = kzalloc(sizeof(*subsys), GFP_KERNEL);
1520 return ERR_PTR(-ENOMEM);
1522 subsys->ver = NVMET_DEFAULT_VS;
1523 /* generate a random serial number as our controllers are ephemeral: */
1524 get_random_bytes(&serial, sizeof(serial));
1525 bin2hex(subsys->serial, &serial, sizeof(serial));
1527 subsys->model_number = kstrdup(NVMET_DEFAULT_CTRL_MODEL, GFP_KERNEL);
1528 if (!subsys->model_number) {
1535 subsys->max_qid = NVMET_NR_QUEUES;
1538 subsys->max_qid = 0;
1541 pr_err("%s: Unknown Subsystem type - %d\n", __func__, type);
1545 subsys->type = type;
1546 subsys->subsysnqn = kstrndup(subsysnqn, NVMF_NQN_SIZE,
1548 if (!subsys->subsysnqn) {
1552 subsys->cntlid_min = NVME_CNTLID_MIN;
1553 subsys->cntlid_max = NVME_CNTLID_MAX;
1554 kref_init(&subsys->ref);
1556 mutex_init(&subsys->lock);
1557 xa_init(&subsys->namespaces);
1558 INIT_LIST_HEAD(&subsys->ctrls);
1559 INIT_LIST_HEAD(&subsys->hosts);
1564 kfree(subsys->model_number);
1567 return ERR_PTR(ret);
1570 static void nvmet_subsys_free(struct kref *ref)
1572 struct nvmet_subsys *subsys =
1573 container_of(ref, struct nvmet_subsys, ref);
1575 WARN_ON_ONCE(!xa_empty(&subsys->namespaces));
1577 xa_destroy(&subsys->namespaces);
1578 nvmet_passthru_subsys_free(subsys);
1580 kfree(subsys->subsysnqn);
1581 kfree(subsys->model_number);
1585 void nvmet_subsys_del_ctrls(struct nvmet_subsys *subsys)
1587 struct nvmet_ctrl *ctrl;
1589 mutex_lock(&subsys->lock);
1590 list_for_each_entry(ctrl, &subsys->ctrls, subsys_entry)
1591 ctrl->ops->delete_ctrl(ctrl);
1592 mutex_unlock(&subsys->lock);
1595 void nvmet_subsys_put(struct nvmet_subsys *subsys)
1597 kref_put(&subsys->ref, nvmet_subsys_free);
1600 static int __init nvmet_init(void)
1604 nvmet_ana_group_enabled[NVMET_DEFAULT_ANA_GRPID] = 1;
1606 zbd_wq = alloc_workqueue("nvmet-zbd-wq", WQ_MEM_RECLAIM, 0);
1610 buffered_io_wq = alloc_workqueue("nvmet-buffered-io-wq",
1612 if (!buffered_io_wq) {
1614 goto out_free_zbd_work_queue;
1617 error = nvmet_init_discovery();
1619 goto out_free_work_queue;
1621 error = nvmet_init_configfs();
1623 goto out_exit_discovery;
1627 nvmet_exit_discovery();
1628 out_free_work_queue:
1629 destroy_workqueue(buffered_io_wq);
1630 out_free_zbd_work_queue:
1631 destroy_workqueue(zbd_wq);
1635 static void __exit nvmet_exit(void)
1637 nvmet_exit_configfs();
1638 nvmet_exit_discovery();
1639 ida_destroy(&cntlid_ida);
1640 destroy_workqueue(buffered_io_wq);
1641 destroy_workqueue(zbd_wq);
1643 BUILD_BUG_ON(sizeof(struct nvmf_disc_rsp_page_entry) != 1024);
1644 BUILD_BUG_ON(sizeof(struct nvmf_disc_rsp_page_hdr) != 1024);
1647 module_init(nvmet_init);
1648 module_exit(nvmet_exit);
1650 MODULE_LICENSE("GPL v2");