| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * Common code for the NVMe target. |
| * Copyright (c) 2015-2016 HGST, a Western Digital Company. |
| */ |
| #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| #include <linux/module.h> |
| #include <linux/random.h> |
| #include <linux/rculist.h> |
| #include <linux/pci-p2pdma.h> |
| #include <linux/scatterlist.h> |
| |
| #define CREATE_TRACE_POINTS |
| #include "trace.h" |
| |
| #include "nvmet.h" |
| |
| struct workqueue_struct *buffered_io_wq; |
| struct workqueue_struct *zbd_wq; |
| static const struct nvmet_fabrics_ops *nvmet_transports[NVMF_TRTYPE_MAX]; |
| static DEFINE_IDA(cntlid_ida); |
| |
| struct workqueue_struct *nvmet_wq; |
| EXPORT_SYMBOL_GPL(nvmet_wq); |
| |
| /* |
| * This read/write semaphore is used to synchronize access to configuration |
| * information on a target system that will result in discovery log page |
| * information change for at least one host. |
| * The full list of resources to protected by this semaphore is: |
| * |
| * - subsystems list |
| * - per-subsystem allowed hosts list |
| * - allow_any_host subsystem attribute |
| * - nvmet_genctr |
| * - the nvmet_transports array |
| * |
| * When updating any of those lists/structures write lock should be obtained, |
| * while when reading (popolating discovery log page or checking host-subsystem |
| * link) read lock is obtained to allow concurrent reads. |
| */ |
| DECLARE_RWSEM(nvmet_config_sem); |
| |
| u32 nvmet_ana_group_enabled[NVMET_MAX_ANAGRPS + 1]; |
| u64 nvmet_ana_chgcnt; |
| DECLARE_RWSEM(nvmet_ana_sem); |
| |
| inline u16 errno_to_nvme_status(struct nvmet_req *req, int errno) |
| { |
| switch (errno) { |
| case 0: |
| return NVME_SC_SUCCESS; |
| case -ENOSPC: |
| req->error_loc = offsetof(struct nvme_rw_command, length); |
| return NVME_SC_CAP_EXCEEDED | NVME_SC_DNR; |
| case -EREMOTEIO: |
| req->error_loc = offsetof(struct nvme_rw_command, slba); |
| return NVME_SC_LBA_RANGE | NVME_SC_DNR; |
| case -EOPNOTSUPP: |
| req->error_loc = offsetof(struct nvme_common_command, opcode); |
| switch (req->cmd->common.opcode) { |
| case nvme_cmd_dsm: |
| case nvme_cmd_write_zeroes: |
| return NVME_SC_ONCS_NOT_SUPPORTED | NVME_SC_DNR; |
| default: |
| return NVME_SC_INVALID_OPCODE | NVME_SC_DNR; |
| } |
| break; |
| case -ENODATA: |
| req->error_loc = offsetof(struct nvme_rw_command, nsid); |
| return NVME_SC_ACCESS_DENIED; |
| case -EIO: |
| fallthrough; |
| default: |
| req->error_loc = offsetof(struct nvme_common_command, opcode); |
| return NVME_SC_INTERNAL | NVME_SC_DNR; |
| } |
| } |
| |
| u16 nvmet_report_invalid_opcode(struct nvmet_req *req) |
| { |
| pr_debug("unhandled cmd %d on qid %d\n", req->cmd->common.opcode, |
| req->sq->qid); |
| |
| req->error_loc = offsetof(struct nvme_common_command, opcode); |
| return NVME_SC_INVALID_OPCODE | NVME_SC_DNR; |
| } |
| |
| static struct nvmet_subsys *nvmet_find_get_subsys(struct nvmet_port *port, |
| const char *subsysnqn); |
| |
| u16 nvmet_copy_to_sgl(struct nvmet_req *req, off_t off, const void *buf, |
| size_t len) |
| { |
| if (sg_pcopy_from_buffer(req->sg, req->sg_cnt, buf, len, off) != len) { |
| req->error_loc = offsetof(struct nvme_common_command, dptr); |
| return NVME_SC_SGL_INVALID_DATA | NVME_SC_DNR; |
| } |
| return 0; |
| } |
| |
| u16 nvmet_copy_from_sgl(struct nvmet_req *req, off_t off, void *buf, size_t len) |
| { |
| if (sg_pcopy_to_buffer(req->sg, req->sg_cnt, buf, len, off) != len) { |
| req->error_loc = offsetof(struct nvme_common_command, dptr); |
| return NVME_SC_SGL_INVALID_DATA | NVME_SC_DNR; |
| } |
| return 0; |
| } |
| |
| u16 nvmet_zero_sgl(struct nvmet_req *req, off_t off, size_t len) |
| { |
| if (sg_zero_buffer(req->sg, req->sg_cnt, len, off) != len) { |
| req->error_loc = offsetof(struct nvme_common_command, dptr); |
| return NVME_SC_SGL_INVALID_DATA | NVME_SC_DNR; |
| } |
| return 0; |
| } |
| |
| static u32 nvmet_max_nsid(struct nvmet_subsys *subsys) |
| { |
| struct nvmet_ns *cur; |
| unsigned long idx; |
| u32 nsid = 0; |
| |
| xa_for_each(&subsys->namespaces, idx, cur) |
| nsid = cur->nsid; |
| |
| return nsid; |
| } |
| |
| static u32 nvmet_async_event_result(struct nvmet_async_event *aen) |
| { |
| return aen->event_type | (aen->event_info << 8) | (aen->log_page << 16); |
| } |
| |
| static void nvmet_async_events_failall(struct nvmet_ctrl *ctrl) |
| { |
| struct nvmet_req *req; |
| |
| mutex_lock(&ctrl->lock); |
| while (ctrl->nr_async_event_cmds) { |
| req = ctrl->async_event_cmds[--ctrl->nr_async_event_cmds]; |
| mutex_unlock(&ctrl->lock); |
| nvmet_req_complete(req, NVME_SC_INTERNAL | NVME_SC_DNR); |
| mutex_lock(&ctrl->lock); |
| } |
| mutex_unlock(&ctrl->lock); |
| } |
| |
| static void nvmet_async_events_process(struct nvmet_ctrl *ctrl) |
| { |
| struct nvmet_async_event *aen; |
| struct nvmet_req *req; |
| |
| mutex_lock(&ctrl->lock); |
| while (ctrl->nr_async_event_cmds && !list_empty(&ctrl->async_events)) { |
| aen = list_first_entry(&ctrl->async_events, |
| struct nvmet_async_event, entry); |
| req = ctrl->async_event_cmds[--ctrl->nr_async_event_cmds]; |
| nvmet_set_result(req, nvmet_async_event_result(aen)); |
| |
| list_del(&aen->entry); |
| kfree(aen); |
| |
| mutex_unlock(&ctrl->lock); |
| trace_nvmet_async_event(ctrl, req->cqe->result.u32); |
| nvmet_req_complete(req, 0); |
| mutex_lock(&ctrl->lock); |
| } |
| mutex_unlock(&ctrl->lock); |
| } |
| |
| static void nvmet_async_events_free(struct nvmet_ctrl *ctrl) |
| { |
| struct nvmet_async_event *aen, *tmp; |
| |
| mutex_lock(&ctrl->lock); |
| list_for_each_entry_safe(aen, tmp, &ctrl->async_events, entry) { |
| list_del(&aen->entry); |
| kfree(aen); |
| } |
| mutex_unlock(&ctrl->lock); |
| } |
| |
| static void nvmet_async_event_work(struct work_struct *work) |
| { |
| struct nvmet_ctrl *ctrl = |
| container_of(work, struct nvmet_ctrl, async_event_work); |
| |
| nvmet_async_events_process(ctrl); |
| } |
| |
| void nvmet_add_async_event(struct nvmet_ctrl *ctrl, u8 event_type, |
| u8 event_info, u8 log_page) |
| { |
| struct nvmet_async_event *aen; |
| |
| aen = kmalloc(sizeof(*aen), GFP_KERNEL); |
| if (!aen) |
| return; |
| |
| aen->event_type = event_type; |
| aen->event_info = event_info; |
| aen->log_page = log_page; |
| |
| mutex_lock(&ctrl->lock); |
| list_add_tail(&aen->entry, &ctrl->async_events); |
| mutex_unlock(&ctrl->lock); |
| |
| queue_work(nvmet_wq, &ctrl->async_event_work); |
| } |
| |
| static void nvmet_add_to_changed_ns_log(struct nvmet_ctrl *ctrl, __le32 nsid) |
| { |
| u32 i; |
| |
| mutex_lock(&ctrl->lock); |
| if (ctrl->nr_changed_ns > NVME_MAX_CHANGED_NAMESPACES) |
| goto out_unlock; |
| |
| for (i = 0; i < ctrl->nr_changed_ns; i++) { |
| if (ctrl->changed_ns_list[i] == nsid) |
| goto out_unlock; |
| } |
| |
| if (ctrl->nr_changed_ns == NVME_MAX_CHANGED_NAMESPACES) { |
| ctrl->changed_ns_list[0] = cpu_to_le32(0xffffffff); |
| ctrl->nr_changed_ns = U32_MAX; |
| goto out_unlock; |
| } |
| |
| ctrl->changed_ns_list[ctrl->nr_changed_ns++] = nsid; |
| out_unlock: |
| mutex_unlock(&ctrl->lock); |
| } |
| |
| void nvmet_ns_changed(struct nvmet_subsys *subsys, u32 nsid) |
| { |
| struct nvmet_ctrl *ctrl; |
| |
| lockdep_assert_held(&subsys->lock); |
| |
| list_for_each_entry(ctrl, &subsys->ctrls, subsys_entry) { |
| nvmet_add_to_changed_ns_log(ctrl, cpu_to_le32(nsid)); |
| if (nvmet_aen_bit_disabled(ctrl, NVME_AEN_BIT_NS_ATTR)) |
| continue; |
| nvmet_add_async_event(ctrl, NVME_AER_TYPE_NOTICE, |
| NVME_AER_NOTICE_NS_CHANGED, |
| NVME_LOG_CHANGED_NS); |
| } |
| } |
| |
| void nvmet_send_ana_event(struct nvmet_subsys *subsys, |
| struct nvmet_port *port) |
| { |
| struct nvmet_ctrl *ctrl; |
| |
| mutex_lock(&subsys->lock); |
| list_for_each_entry(ctrl, &subsys->ctrls, subsys_entry) { |
| if (port && ctrl->port != port) |
| continue; |
| if (nvmet_aen_bit_disabled(ctrl, NVME_AEN_BIT_ANA_CHANGE)) |
| continue; |
| nvmet_add_async_event(ctrl, NVME_AER_TYPE_NOTICE, |
| NVME_AER_NOTICE_ANA, NVME_LOG_ANA); |
| } |
| mutex_unlock(&subsys->lock); |
| } |
| |
| void nvmet_port_send_ana_event(struct nvmet_port *port) |
| { |
| struct nvmet_subsys_link *p; |
| |
| down_read(&nvmet_config_sem); |
| list_for_each_entry(p, &port->subsystems, entry) |
| nvmet_send_ana_event(p->subsys, port); |
| up_read(&nvmet_config_sem); |
| } |
| |
| int nvmet_register_transport(const struct nvmet_fabrics_ops *ops) |
| { |
| int ret = 0; |
| |
| down_write(&nvmet_config_sem); |
| if (nvmet_transports[ops->type]) |
| ret = -EINVAL; |
| else |
| nvmet_transports[ops->type] = ops; |
| up_write(&nvmet_config_sem); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(nvmet_register_transport); |
| |
| void nvmet_unregister_transport(const struct nvmet_fabrics_ops *ops) |
| { |
| down_write(&nvmet_config_sem); |
| nvmet_transports[ops->type] = NULL; |
| up_write(&nvmet_config_sem); |
| } |
| EXPORT_SYMBOL_GPL(nvmet_unregister_transport); |
| |
| void nvmet_port_del_ctrls(struct nvmet_port *port, struct nvmet_subsys *subsys) |
| { |
| struct nvmet_ctrl *ctrl; |
| |
| mutex_lock(&subsys->lock); |
| list_for_each_entry(ctrl, &subsys->ctrls, subsys_entry) { |
| if (ctrl->port == port) |
| ctrl->ops->delete_ctrl(ctrl); |
| } |
| mutex_unlock(&subsys->lock); |
| } |
| |
| int nvmet_enable_port(struct nvmet_port *port) |
| { |
| const struct nvmet_fabrics_ops *ops; |
| int ret; |
| |
| lockdep_assert_held(&nvmet_config_sem); |
| |
| ops = nvmet_transports[port->disc_addr.trtype]; |
| if (!ops) { |
| up_write(&nvmet_config_sem); |
| request_module("nvmet-transport-%d", port->disc_addr.trtype); |
| down_write(&nvmet_config_sem); |
| ops = nvmet_transports[port->disc_addr.trtype]; |
| if (!ops) { |
| pr_err("transport type %d not supported\n", |
| port->disc_addr.trtype); |
| return -EINVAL; |
| } |
| } |
| |
| if (!try_module_get(ops->owner)) |
| return -EINVAL; |
| |
| /* |
| * If the user requested PI support and the transport isn't pi capable, |
| * don't enable the port. |
| */ |
| if (port->pi_enable && !(ops->flags & NVMF_METADATA_SUPPORTED)) { |
| pr_err("T10-PI is not supported by transport type %d\n", |
| port->disc_addr.trtype); |
| ret = -EINVAL; |
| goto out_put; |
| } |
| |
| ret = ops->add_port(port); |
| if (ret) |
| goto out_put; |
| |
| /* If the transport didn't set inline_data_size, then disable it. */ |
| if (port->inline_data_size < 0) |
| port->inline_data_size = 0; |
| |
| port->enabled = true; |
| port->tr_ops = ops; |
| return 0; |
| |
| out_put: |
| module_put(ops->owner); |
| return ret; |
| } |
| |
| void nvmet_disable_port(struct nvmet_port *port) |
| { |
| const struct nvmet_fabrics_ops *ops; |
| |
| lockdep_assert_held(&nvmet_config_sem); |
| |
| port->enabled = false; |
| port->tr_ops = NULL; |
| |
| ops = nvmet_transports[port->disc_addr.trtype]; |
| ops->remove_port(port); |
| module_put(ops->owner); |
| } |
| |
| static void nvmet_keep_alive_timer(struct work_struct *work) |
| { |
| struct nvmet_ctrl *ctrl = container_of(to_delayed_work(work), |
| struct nvmet_ctrl, ka_work); |
| bool reset_tbkas = ctrl->reset_tbkas; |
| |
| ctrl->reset_tbkas = false; |
| if (reset_tbkas) { |
| pr_debug("ctrl %d reschedule traffic based keep-alive timer\n", |
| ctrl->cntlid); |
| queue_delayed_work(nvmet_wq, &ctrl->ka_work, ctrl->kato * HZ); |
| return; |
| } |
| |
| pr_err("ctrl %d keep-alive timer (%d seconds) expired!\n", |
| ctrl->cntlid, ctrl->kato); |
| |
| nvmet_ctrl_fatal_error(ctrl); |
| } |
| |
| void nvmet_start_keep_alive_timer(struct nvmet_ctrl *ctrl) |
| { |
| if (unlikely(ctrl->kato == 0)) |
| return; |
| |
| pr_debug("ctrl %d start keep-alive timer for %d secs\n", |
| ctrl->cntlid, ctrl->kato); |
| |
| queue_delayed_work(nvmet_wq, &ctrl->ka_work, ctrl->kato * HZ); |
| } |
| |
| void nvmet_stop_keep_alive_timer(struct nvmet_ctrl *ctrl) |
| { |
| if (unlikely(ctrl->kato == 0)) |
| return; |
| |
| pr_debug("ctrl %d stop keep-alive\n", ctrl->cntlid); |
| |
| cancel_delayed_work_sync(&ctrl->ka_work); |
| } |
| |
| u16 nvmet_req_find_ns(struct nvmet_req *req) |
| { |
| u32 nsid = le32_to_cpu(req->cmd->common.nsid); |
| |
| req->ns = xa_load(&nvmet_req_subsys(req)->namespaces, nsid); |
| if (unlikely(!req->ns)) { |
| req->error_loc = offsetof(struct nvme_common_command, nsid); |
| return NVME_SC_INVALID_NS | NVME_SC_DNR; |
| } |
| |
| percpu_ref_get(&req->ns->ref); |
| return NVME_SC_SUCCESS; |
| } |
| |
| static void nvmet_destroy_namespace(struct percpu_ref *ref) |
| { |
| struct nvmet_ns *ns = container_of(ref, struct nvmet_ns, ref); |
| |
| complete(&ns->disable_done); |
| } |
| |
| void nvmet_put_namespace(struct nvmet_ns *ns) |
| { |
| percpu_ref_put(&ns->ref); |
| } |
| |
| static void nvmet_ns_dev_disable(struct nvmet_ns *ns) |
| { |
| nvmet_bdev_ns_disable(ns); |
| nvmet_file_ns_disable(ns); |
| } |
| |
| static int nvmet_p2pmem_ns_enable(struct nvmet_ns *ns) |
| { |
| int ret; |
| struct pci_dev *p2p_dev; |
| |
| if (!ns->use_p2pmem) |
| return 0; |
| |
| if (!ns->bdev) { |
| pr_err("peer-to-peer DMA is not supported by non-block device namespaces\n"); |
| return -EINVAL; |
| } |
| |
| if (!blk_queue_pci_p2pdma(ns->bdev->bd_disk->queue)) { |
| pr_err("peer-to-peer DMA is not supported by the driver of %s\n", |
| ns->device_path); |
| return -EINVAL; |
| } |
| |
| if (ns->p2p_dev) { |
| ret = pci_p2pdma_distance(ns->p2p_dev, nvmet_ns_dev(ns), true); |
| if (ret < 0) |
| return -EINVAL; |
| } else { |
| /* |
| * Right now we just check that there is p2pmem available so |
| * we can report an error to the user right away if there |
| * is not. We'll find the actual device to use once we |
| * setup the controller when the port's device is available. |
| */ |
| |
| p2p_dev = pci_p2pmem_find(nvmet_ns_dev(ns)); |
| if (!p2p_dev) { |
| pr_err("no peer-to-peer memory is available for %s\n", |
| ns->device_path); |
| return -EINVAL; |
| } |
| |
| pci_dev_put(p2p_dev); |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * Note: ctrl->subsys->lock should be held when calling this function |
| */ |
| static void nvmet_p2pmem_ns_add_p2p(struct nvmet_ctrl *ctrl, |
| struct nvmet_ns *ns) |
| { |
| struct device *clients[2]; |
| struct pci_dev *p2p_dev; |
| int ret; |
| |
| if (!ctrl->p2p_client || !ns->use_p2pmem) |
| return; |
| |
| if (ns->p2p_dev) { |
| ret = pci_p2pdma_distance(ns->p2p_dev, ctrl->p2p_client, true); |
| if (ret < 0) |
| return; |
| |
| p2p_dev = pci_dev_get(ns->p2p_dev); |
| } else { |
| clients[0] = ctrl->p2p_client; |
| clients[1] = nvmet_ns_dev(ns); |
| |
| p2p_dev = pci_p2pmem_find_many(clients, ARRAY_SIZE(clients)); |
| if (!p2p_dev) { |
| pr_err("no peer-to-peer memory is available that's supported by %s and %s\n", |
| dev_name(ctrl->p2p_client), ns->device_path); |
| return; |
| } |
| } |
| |
| ret = radix_tree_insert(&ctrl->p2p_ns_map, ns->nsid, p2p_dev); |
| if (ret < 0) |
| pci_dev_put(p2p_dev); |
| |
| pr_info("using p2pmem on %s for nsid %d\n", pci_name(p2p_dev), |
| ns->nsid); |
| } |
| |
| bool nvmet_ns_revalidate(struct nvmet_ns *ns) |
| { |
| loff_t oldsize = ns->size; |
| |
| if (ns->bdev) |
| nvmet_bdev_ns_revalidate(ns); |
| else |
| nvmet_file_ns_revalidate(ns); |
| |
| return oldsize != ns->size; |
| } |
| |
| int nvmet_ns_enable(struct nvmet_ns *ns) |
| { |
| struct nvmet_subsys *subsys = ns->subsys; |
| struct nvmet_ctrl *ctrl; |
| int ret; |
| |
| mutex_lock(&subsys->lock); |
| ret = 0; |
| |
| if (nvmet_is_passthru_subsys(subsys)) { |
| pr_info("cannot enable both passthru and regular namespaces for a single subsystem"); |
| goto out_unlock; |
| } |
| |
| if (ns->enabled) |
| goto out_unlock; |
| |
| ret = -EMFILE; |
| if (subsys->nr_namespaces == NVMET_MAX_NAMESPACES) |
| goto out_unlock; |
| |
| ret = nvmet_bdev_ns_enable(ns); |
| if (ret == -ENOTBLK) |
| ret = nvmet_file_ns_enable(ns); |
| if (ret) |
| goto out_unlock; |
| |
| ret = nvmet_p2pmem_ns_enable(ns); |
| if (ret) |
| goto out_dev_disable; |
| |
| list_for_each_entry(ctrl, &subsys->ctrls, subsys_entry) |
| nvmet_p2pmem_ns_add_p2p(ctrl, ns); |
| |
| ret = percpu_ref_init(&ns->ref, nvmet_destroy_namespace, |
| 0, GFP_KERNEL); |
| if (ret) |
| goto out_dev_put; |
| |
| if (ns->nsid > subsys->max_nsid) |
| subsys->max_nsid = ns->nsid; |
| |
| ret = xa_insert(&subsys->namespaces, ns->nsid, ns, GFP_KERNEL); |
| if (ret) |
| goto out_restore_subsys_maxnsid; |
| |
| subsys->nr_namespaces++; |
| |
| nvmet_ns_changed(subsys, ns->nsid); |
| ns->enabled = true; |
| ret = 0; |
| out_unlock: |
| mutex_unlock(&subsys->lock); |
| return ret; |
| |
| out_restore_subsys_maxnsid: |
| subsys->max_nsid = nvmet_max_nsid(subsys); |
| percpu_ref_exit(&ns->ref); |
| out_dev_put: |
| list_for_each_entry(ctrl, &subsys->ctrls, subsys_entry) |
| pci_dev_put(radix_tree_delete(&ctrl->p2p_ns_map, ns->nsid)); |
| out_dev_disable: |
| nvmet_ns_dev_disable(ns); |
| goto out_unlock; |
| } |
| |
| void nvmet_ns_disable(struct nvmet_ns *ns) |
| { |
| struct nvmet_subsys *subsys = ns->subsys; |
| struct nvmet_ctrl *ctrl; |
| |
| mutex_lock(&subsys->lock); |
| if (!ns->enabled) |
| goto out_unlock; |
| |
| ns->enabled = false; |
| xa_erase(&ns->subsys->namespaces, ns->nsid); |
| if (ns->nsid == subsys->max_nsid) |
| subsys->max_nsid = nvmet_max_nsid(subsys); |
| |
| list_for_each_entry(ctrl, &subsys->ctrls, subsys_entry) |
| pci_dev_put(radix_tree_delete(&ctrl->p2p_ns_map, ns->nsid)); |
| |
| mutex_unlock(&subsys->lock); |
| |
| /* |
| * Now that we removed the namespaces from the lookup list, we |
| * can kill the per_cpu ref and wait for any remaining references |
| * to be dropped, as well as a RCU grace period for anyone only |
| * using the namepace under rcu_read_lock(). Note that we can't |
| * use call_rcu here as we need to ensure the namespaces have |
| * been fully destroyed before unloading the module. |
| */ |
| percpu_ref_kill(&ns->ref); |
| synchronize_rcu(); |
| wait_for_completion(&ns->disable_done); |
| percpu_ref_exit(&ns->ref); |
| |
| mutex_lock(&subsys->lock); |
| |
| subsys->nr_namespaces--; |
| nvmet_ns_changed(subsys, ns->nsid); |
| nvmet_ns_dev_disable(ns); |
| out_unlock: |
| mutex_unlock(&subsys->lock); |
| } |
| |
| void nvmet_ns_free(struct nvmet_ns *ns) |
| { |
| nvmet_ns_disable(ns); |
| |
| down_write(&nvmet_ana_sem); |
| nvmet_ana_group_enabled[ns->anagrpid]--; |
| up_write(&nvmet_ana_sem); |
| |
| kfree(ns->device_path); |
| kfree(ns); |
| } |
| |
| struct nvmet_ns *nvmet_ns_alloc(struct nvmet_subsys *subsys, u32 nsid) |
| { |
| struct nvmet_ns *ns; |
| |
| ns = kzalloc(sizeof(*ns), GFP_KERNEL); |
| if (!ns) |
| return NULL; |
| |
| init_completion(&ns->disable_done); |
| |
| ns->nsid = nsid; |
| ns->subsys = subsys; |
| |
| down_write(&nvmet_ana_sem); |
| ns->anagrpid = NVMET_DEFAULT_ANA_GRPID; |
| nvmet_ana_group_enabled[ns->anagrpid]++; |
| up_write(&nvmet_ana_sem); |
| |
| uuid_gen(&ns->uuid); |
| ns->buffered_io = false; |
| ns->csi = NVME_CSI_NVM; |
| |
| return ns; |
| } |
| |
| static void nvmet_update_sq_head(struct nvmet_req *req) |
| { |
| if (req->sq->size) { |
| u32 old_sqhd, new_sqhd; |
| |
| do { |
| old_sqhd = req->sq->sqhd; |
| new_sqhd = (old_sqhd + 1) % req->sq->size; |
| } while (cmpxchg(&req->sq->sqhd, old_sqhd, new_sqhd) != |
| old_sqhd); |
| } |
| req->cqe->sq_head = cpu_to_le16(req->sq->sqhd & 0x0000FFFF); |
| } |
| |
| static void nvmet_set_error(struct nvmet_req *req, u16 status) |
| { |
| struct nvmet_ctrl *ctrl = req->sq->ctrl; |
| struct nvme_error_slot *new_error_slot; |
| unsigned long flags; |
| |
| req->cqe->status = cpu_to_le16(status << 1); |
| |
| if (!ctrl || req->error_loc == NVMET_NO_ERROR_LOC) |
| return; |
| |
| spin_lock_irqsave(&ctrl->error_lock, flags); |
| ctrl->err_counter++; |
| new_error_slot = |
| &ctrl->slots[ctrl->err_counter % NVMET_ERROR_LOG_SLOTS]; |
| |
| new_error_slot->error_count = cpu_to_le64(ctrl->err_counter); |
| new_error_slot->sqid = cpu_to_le16(req->sq->qid); |
| new_error_slot->cmdid = cpu_to_le16(req->cmd->common.command_id); |
| new_error_slot->status_field = cpu_to_le16(status << 1); |
| new_error_slot->param_error_location = cpu_to_le16(req->error_loc); |
| new_error_slot->lba = cpu_to_le64(req->error_slba); |
| new_error_slot->nsid = req->cmd->common.nsid; |
| spin_unlock_irqrestore(&ctrl->error_lock, flags); |
| |
| /* set the more bit for this request */ |
| req->cqe->status |= cpu_to_le16(1 << 14); |
| } |
| |
| static void __nvmet_req_complete(struct nvmet_req *req, u16 status) |
| { |
| if (!req->sq->sqhd_disabled) |
| nvmet_update_sq_head(req); |
| req->cqe->sq_id = cpu_to_le16(req->sq->qid); |
| req->cqe->command_id = req->cmd->common.command_id; |
| |
| if (unlikely(status)) |
| nvmet_set_error(req, status); |
| |
| trace_nvmet_req_complete(req); |
| |
| if (req->ns) |
| nvmet_put_namespace(req->ns); |
| req->ops->queue_response(req); |
| } |
| |
| void nvmet_req_complete(struct nvmet_req *req, u16 status) |
| { |
| __nvmet_req_complete(req, status); |
| percpu_ref_put(&req->sq->ref); |
| } |
| EXPORT_SYMBOL_GPL(nvmet_req_complete); |
| |
| void nvmet_cq_setup(struct nvmet_ctrl *ctrl, struct nvmet_cq *cq, |
| u16 qid, u16 size) |
| { |
| cq->qid = qid; |
| cq->size = size; |
| } |
| |
| void nvmet_sq_setup(struct nvmet_ctrl *ctrl, struct nvmet_sq *sq, |
| u16 qid, u16 size) |
| { |
| sq->sqhd = 0; |
| sq->qid = qid; |
| sq->size = size; |
| |
| ctrl->sqs[qid] = sq; |
| } |
| |
| static void nvmet_confirm_sq(struct percpu_ref *ref) |
| { |
| struct nvmet_sq *sq = container_of(ref, struct nvmet_sq, ref); |
| |
| complete(&sq->confirm_done); |
| } |
| |
| void nvmet_sq_destroy(struct nvmet_sq *sq) |
| { |
| struct nvmet_ctrl *ctrl = sq->ctrl; |
| |
| /* |
| * If this is the admin queue, complete all AERs so that our |
| * queue doesn't have outstanding requests on it. |
| */ |
| if (ctrl && ctrl->sqs && ctrl->sqs[0] == sq) |
| nvmet_async_events_failall(ctrl); |
| percpu_ref_kill_and_confirm(&sq->ref, nvmet_confirm_sq); |
| wait_for_completion(&sq->confirm_done); |
| wait_for_completion(&sq->free_done); |
| percpu_ref_exit(&sq->ref); |
| |
| if (ctrl) { |
| /* |
| * The teardown flow may take some time, and the host may not |
| * send us keep-alive during this period, hence reset the |
| * traffic based keep-alive timer so we don't trigger a |
| * controller teardown as a result of a keep-alive expiration. |
| */ |
| ctrl->reset_tbkas = true; |
| sq->ctrl->sqs[sq->qid] = NULL; |
| nvmet_ctrl_put(ctrl); |
| sq->ctrl = NULL; /* allows reusing the queue later */ |
| } |
| } |
| EXPORT_SYMBOL_GPL(nvmet_sq_destroy); |
| |
| static void nvmet_sq_free(struct percpu_ref *ref) |
| { |
| struct nvmet_sq *sq = container_of(ref, struct nvmet_sq, ref); |
| |
| complete(&sq->free_done); |
| } |
| |
| int nvmet_sq_init(struct nvmet_sq *sq) |
| { |
| int ret; |
| |
| ret = percpu_ref_init(&sq->ref, nvmet_sq_free, 0, GFP_KERNEL); |
| if (ret) { |
| pr_err("percpu_ref init failed!\n"); |
| return ret; |
| } |
| init_completion(&sq->free_done); |
| init_completion(&sq->confirm_done); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(nvmet_sq_init); |
| |
| static inline u16 nvmet_check_ana_state(struct nvmet_port *port, |
| struct nvmet_ns *ns) |
| { |
| enum nvme_ana_state state = port->ana_state[ns->anagrpid]; |
| |
| if (unlikely(state == NVME_ANA_INACCESSIBLE)) |
| return NVME_SC_ANA_INACCESSIBLE; |
| if (unlikely(state == NVME_ANA_PERSISTENT_LOSS)) |
| return NVME_SC_ANA_PERSISTENT_LOSS; |
| if (unlikely(state == NVME_ANA_CHANGE)) |
| return NVME_SC_ANA_TRANSITION; |
| return 0; |
| } |
| |
| static inline u16 nvmet_io_cmd_check_access(struct nvmet_req *req) |
| { |
| if (unlikely(req->ns->readonly)) { |
| switch (req->cmd->common.opcode) { |
| case nvme_cmd_read: |
| case nvme_cmd_flush: |
| break; |
| default: |
| return NVME_SC_NS_WRITE_PROTECTED; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static u16 nvmet_parse_io_cmd(struct nvmet_req *req) |
| { |
| u16 ret; |
| |
| ret = nvmet_check_ctrl_status(req); |
| if (unlikely(ret)) |
| return ret; |
| |
| if (nvmet_is_passthru_req(req)) |
| return nvmet_parse_passthru_io_cmd(req); |
| |
| ret = nvmet_req_find_ns(req); |
| if (unlikely(ret)) |
| return ret; |
| |
| ret = nvmet_check_ana_state(req->port, req->ns); |
| if (unlikely(ret)) { |
| req->error_loc = offsetof(struct nvme_common_command, nsid); |
| return ret; |
| } |
| ret = nvmet_io_cmd_check_access(req); |
| if (unlikely(ret)) { |
| req->error_loc = offsetof(struct nvme_common_command, nsid); |
| return ret; |
| } |
| |
| switch (req->ns->csi) { |
| case NVME_CSI_NVM: |
| if (req->ns->file) |
| return nvmet_file_parse_io_cmd(req); |
| return nvmet_bdev_parse_io_cmd(req); |
| case NVME_CSI_ZNS: |
| if (IS_ENABLED(CONFIG_BLK_DEV_ZONED)) |
| return nvmet_bdev_zns_parse_io_cmd(req); |
| return NVME_SC_INVALID_IO_CMD_SET; |
| default: |
| return NVME_SC_INVALID_IO_CMD_SET; |
| } |
| } |
| |
| bool nvmet_req_init(struct nvmet_req *req, struct nvmet_cq *cq, |
| struct nvmet_sq *sq, const struct nvmet_fabrics_ops *ops) |
| { |
| u8 flags = req->cmd->common.flags; |
| u16 status; |
| |
| req->cq = cq; |
| req->sq = sq; |
| req->ops = ops; |
| req->sg = NULL; |
| req->metadata_sg = NULL; |
| req->sg_cnt = 0; |
| req->metadata_sg_cnt = 0; |
| req->transfer_len = 0; |
| req->metadata_len = 0; |
| req->cqe->status = 0; |
| req->cqe->sq_head = 0; |
| req->ns = NULL; |
| req->error_loc = NVMET_NO_ERROR_LOC; |
| req->error_slba = 0; |
| |
| /* no support for fused commands yet */ |
| if (unlikely(flags & (NVME_CMD_FUSE_FIRST | NVME_CMD_FUSE_SECOND))) { |
| req->error_loc = offsetof(struct nvme_common_command, flags); |
| status = NVME_SC_INVALID_FIELD | NVME_SC_DNR; |
| goto fail; |
| } |
| |
| /* |
| * For fabrics, PSDT field shall describe metadata pointer (MPTR) that |
| * contains an address of a single contiguous physical buffer that is |
| * byte aligned. |
| */ |
| if (unlikely((flags & NVME_CMD_SGL_ALL) != NVME_CMD_SGL_METABUF)) { |
| req->error_loc = offsetof(struct nvme_common_command, flags); |
| status = NVME_SC_INVALID_FIELD | NVME_SC_DNR; |
| goto fail; |
| } |
| |
| if (unlikely(!req->sq->ctrl)) |
| /* will return an error for any non-connect command: */ |
| status = nvmet_parse_connect_cmd(req); |
| else if (likely(req->sq->qid != 0)) |
| status = nvmet_parse_io_cmd(req); |
| else |
| status = nvmet_parse_admin_cmd(req); |
| |
| if (status) |
| goto fail; |
| |
| trace_nvmet_req_init(req, req->cmd); |
| |
| if (unlikely(!percpu_ref_tryget_live(&sq->ref))) { |
| status = NVME_SC_INVALID_FIELD | NVME_SC_DNR; |
| goto fail; |
| } |
| |
| if (sq->ctrl) |
| sq->ctrl->reset_tbkas = true; |
| |
| return true; |
| |
| fail: |
| __nvmet_req_complete(req, status); |
| return false; |
| } |
| EXPORT_SYMBOL_GPL(nvmet_req_init); |
| |
| void nvmet_req_uninit(struct nvmet_req *req) |
| { |
| percpu_ref_put(&req->sq->ref); |
| if (req->ns) |
| nvmet_put_namespace(req->ns); |
| } |
| EXPORT_SYMBOL_GPL(nvmet_req_uninit); |
| |
| bool nvmet_check_transfer_len(struct nvmet_req *req, size_t len) |
| { |
| if (unlikely(len != req->transfer_len)) { |
| req->error_loc = offsetof(struct nvme_common_command, dptr); |
| nvmet_req_complete(req, NVME_SC_SGL_INVALID_DATA | NVME_SC_DNR); |
| return false; |
| } |
| |
| return true; |
| } |
| EXPORT_SYMBOL_GPL(nvmet_check_transfer_len); |
| |
| bool nvmet_check_data_len_lte(struct nvmet_req *req, size_t data_len) |
| { |
| if (unlikely(data_len > req->transfer_len)) { |
| req->error_loc = offsetof(struct nvme_common_command, dptr); |
| nvmet_req_complete(req, NVME_SC_SGL_INVALID_DATA | NVME_SC_DNR); |
| return false; |
| } |
| |
| return true; |
| } |
| |
| static unsigned int nvmet_data_transfer_len(struct nvmet_req *req) |
| { |
| return req->transfer_len - req->metadata_len; |
| } |
| |
| static int nvmet_req_alloc_p2pmem_sgls(struct pci_dev *p2p_dev, |
| struct nvmet_req *req) |
| { |
| req->sg = pci_p2pmem_alloc_sgl(p2p_dev, &req->sg_cnt, |
| nvmet_data_transfer_len(req)); |
| if (!req->sg) |
| goto out_err; |
| |
| if (req->metadata_len) { |
| req->metadata_sg = pci_p2pmem_alloc_sgl(p2p_dev, |
| &req->metadata_sg_cnt, req->metadata_len); |
| if (!req->metadata_sg) |
| goto out_free_sg; |
| } |
| |
| req->p2p_dev = p2p_dev; |
| |
| return 0; |
| out_free_sg: |
| pci_p2pmem_free_sgl(req->p2p_dev, req->sg); |
| out_err: |
| return -ENOMEM; |
| } |
| |
| static struct pci_dev *nvmet_req_find_p2p_dev(struct nvmet_req *req) |
| { |
| if (!IS_ENABLED(CONFIG_PCI_P2PDMA) || |
| !req->sq->ctrl || !req->sq->qid || !req->ns) |
| return NULL; |
| return radix_tree_lookup(&req->sq->ctrl->p2p_ns_map, req->ns->nsid); |
| } |
| |
| int nvmet_req_alloc_sgls(struct nvmet_req *req) |
| { |
| struct pci_dev *p2p_dev = nvmet_req_find_p2p_dev(req); |
| |
| if (p2p_dev && !nvmet_req_alloc_p2pmem_sgls(p2p_dev, req)) |
| return 0; |
| |
| req->sg = sgl_alloc(nvmet_data_transfer_len(req), GFP_KERNEL, |
| &req->sg_cnt); |
| if (unlikely(!req->sg)) |
| goto out; |
| |
| if (req->metadata_len) { |
| req->metadata_sg = sgl_alloc(req->metadata_len, GFP_KERNEL, |
| &req->metadata_sg_cnt); |
| if (unlikely(!req->metadata_sg)) |
| goto out_free; |
| } |
| |
| return 0; |
| out_free: |
| sgl_free(req->sg); |
| out: |
| return -ENOMEM; |
| } |
| EXPORT_SYMBOL_GPL(nvmet_req_alloc_sgls); |
| |
| void nvmet_req_free_sgls(struct nvmet_req *req) |
| { |
| if (req->p2p_dev) { |
| pci_p2pmem_free_sgl(req->p2p_dev, req->sg); |
| if (req->metadata_sg) |
| pci_p2pmem_free_sgl(req->p2p_dev, req->metadata_sg); |
| req->p2p_dev = NULL; |
| } else { |
| sgl_free(req->sg); |
| if (req->metadata_sg) |
| sgl_free(req->metadata_sg); |
| } |
| |
| req->sg = NULL; |
| req->metadata_sg = NULL; |
| req->sg_cnt = 0; |
| req->metadata_sg_cnt = 0; |
| } |
| EXPORT_SYMBOL_GPL(nvmet_req_free_sgls); |
| |
| static inline bool nvmet_cc_en(u32 cc) |
| { |
| return (cc >> NVME_CC_EN_SHIFT) & 0x1; |
| } |
| |
| static inline u8 nvmet_cc_css(u32 cc) |
| { |
| return (cc >> NVME_CC_CSS_SHIFT) & 0x7; |
| } |
| |
| static inline u8 nvmet_cc_mps(u32 cc) |
| { |
| return (cc >> NVME_CC_MPS_SHIFT) & 0xf; |
| } |
| |
| static inline u8 nvmet_cc_ams(u32 cc) |
| { |
| return (cc >> NVME_CC_AMS_SHIFT) & 0x7; |
| } |
| |
| static inline u8 nvmet_cc_shn(u32 cc) |
| { |
| return (cc >> NVME_CC_SHN_SHIFT) & 0x3; |
| } |
| |
| static inline u8 nvmet_cc_iosqes(u32 cc) |
| { |
| return (cc >> NVME_CC_IOSQES_SHIFT) & 0xf; |
| } |
| |
| static inline u8 nvmet_cc_iocqes(u32 cc) |
| { |
| return (cc >> NVME_CC_IOCQES_SHIFT) & 0xf; |
| } |
| |
| static inline bool nvmet_css_supported(u8 cc_css) |
| { |
| switch (cc_css << NVME_CC_CSS_SHIFT) { |
| case NVME_CC_CSS_NVM: |
| case NVME_CC_CSS_CSI: |
| return true; |
| default: |
| return false; |
| } |
| } |
| |
| static void nvmet_start_ctrl(struct nvmet_ctrl *ctrl) |
| { |
| lockdep_assert_held(&ctrl->lock); |
| |
| /* |
| * Only I/O controllers should verify iosqes,iocqes. |
| * Strictly speaking, the spec says a discovery controller |
| * should verify iosqes,iocqes are zeroed, however that |
| * would break backwards compatibility, so don't enforce it. |
| */ |
| if (!nvmet_is_disc_subsys(ctrl->subsys) && |
| (nvmet_cc_iosqes(ctrl->cc) != NVME_NVM_IOSQES || |
| nvmet_cc_iocqes(ctrl->cc) != NVME_NVM_IOCQES)) { |
| ctrl->csts = NVME_CSTS_CFS; |
| return; |
| } |
| |
| if (nvmet_cc_mps(ctrl->cc) != 0 || |
| nvmet_cc_ams(ctrl->cc) != 0 || |
| !nvmet_css_supported(nvmet_cc_css(ctrl->cc))) { |
| ctrl->csts = NVME_CSTS_CFS; |
| return; |
| } |
| |
| ctrl->csts = NVME_CSTS_RDY; |
| |
| /* |
| * Controllers that are not yet enabled should not really enforce the |
| * keep alive timeout, but we still want to track a timeout and cleanup |
| * in case a host died before it enabled the controller. Hence, simply |
| * reset the keep alive timer when the controller is enabled. |
| */ |
| if (ctrl->kato) |
| mod_delayed_work(system_wq, &ctrl->ka_work, ctrl->kato * HZ); |
| } |
| |
| static void nvmet_clear_ctrl(struct nvmet_ctrl *ctrl) |
| { |
| lockdep_assert_held(&ctrl->lock); |
| |
| /* XXX: tear down queues? */ |
| ctrl->csts &= ~NVME_CSTS_RDY; |
| ctrl->cc = 0; |
| } |
| |
| void nvmet_update_cc(struct nvmet_ctrl *ctrl, u32 new) |
| { |
| u32 old; |
| |
| mutex_lock(&ctrl->lock); |
| old = ctrl->cc; |
| ctrl->cc = new; |
| |
| if (nvmet_cc_en(new) && !nvmet_cc_en(old)) |
| nvmet_start_ctrl(ctrl); |
| if (!nvmet_cc_en(new) && nvmet_cc_en(old)) |
| nvmet_clear_ctrl(ctrl); |
| if (nvmet_cc_shn(new) && !nvmet_cc_shn(old)) { |
| nvmet_clear_ctrl(ctrl); |
| ctrl->csts |= NVME_CSTS_SHST_CMPLT; |
| } |
| if (!nvmet_cc_shn(new) && nvmet_cc_shn(old)) |
| ctrl->csts &= ~NVME_CSTS_SHST_CMPLT; |
| mutex_unlock(&ctrl->lock); |
| } |
| |
| static void nvmet_init_cap(struct nvmet_ctrl *ctrl) |
| { |
| /* command sets supported: NVMe command set: */ |
| ctrl->cap = (1ULL << 37); |
| /* Controller supports one or more I/O Command Sets */ |
| ctrl->cap |= (1ULL << 43); |
| /* CC.EN timeout in 500msec units: */ |
| ctrl->cap |= (15ULL << 24); |
| /* maximum queue entries supported: */ |
| if (ctrl->ops->get_max_queue_size) |
| ctrl->cap |= ctrl->ops->get_max_queue_size(ctrl) - 1; |
| else |
| ctrl->cap |= NVMET_QUEUE_SIZE - 1; |
| |
| if (nvmet_is_passthru_subsys(ctrl->subsys)) |
| nvmet_passthrough_override_cap(ctrl); |
| } |
| |
| struct nvmet_ctrl *nvmet_ctrl_find_get(const char *subsysnqn, |
| const char *hostnqn, u16 cntlid, |
| struct nvmet_req *req) |
| { |
| struct nvmet_ctrl *ctrl = NULL; |
| struct nvmet_subsys *subsys; |
| |
| subsys = nvmet_find_get_subsys(req->port, subsysnqn); |
| if (!subsys) { |
| pr_warn("connect request for invalid subsystem %s!\n", |
| subsysnqn); |
| req->cqe->result.u32 = IPO_IATTR_CONNECT_DATA(subsysnqn); |
| goto out; |
| } |
| |
| mutex_lock(&subsys->lock); |
| list_for_each_entry(ctrl, &subsys->ctrls, subsys_entry) { |
| if (ctrl->cntlid == cntlid) { |
| if (strncmp(hostnqn, ctrl->hostnqn, NVMF_NQN_SIZE)) { |
| pr_warn("hostnqn mismatch.\n"); |
| continue; |
| } |
| if (!kref_get_unless_zero(&ctrl->ref)) |
| continue; |
| |
| /* ctrl found */ |
| goto found; |
| } |
| } |
| |
| ctrl = NULL; /* ctrl not found */ |
| pr_warn("could not find controller %d for subsys %s / host %s\n", |
| cntlid, subsysnqn, hostnqn); |
| req->cqe->result.u32 = IPO_IATTR_CONNECT_DATA(cntlid); |
| |
| found: |
| mutex_unlock(&subsys->lock); |
| nvmet_subsys_put(subsys); |
| out: |
| return ctrl; |
| } |
| |
| u16 nvmet_check_ctrl_status(struct nvmet_req *req) |
| { |
| if (unlikely(!(req->sq->ctrl->cc & NVME_CC_ENABLE))) { |
| pr_err("got cmd %d while CC.EN == 0 on qid = %d\n", |
| req->cmd->common.opcode, req->sq->qid); |
| return NVME_SC_CMD_SEQ_ERROR | NVME_SC_DNR; |
| } |
| |
| if (unlikely(!(req->sq->ctrl->csts & NVME_CSTS_RDY))) { |
| pr_err("got cmd %d while CSTS.RDY == 0 on qid = %d\n", |
| req->cmd->common.opcode, req->sq->qid); |
| return NVME_SC_CMD_SEQ_ERROR | NVME_SC_DNR; |
| } |
| return 0; |
| } |
| |
| bool nvmet_host_allowed(struct nvmet_subsys *subsys, const char *hostnqn) |
| { |
| struct nvmet_host_link *p; |
| |
| lockdep_assert_held(&nvmet_config_sem); |
| |
| if (subsys->allow_any_host) |
| return true; |
| |
| if (nvmet_is_disc_subsys(subsys)) /* allow all access to disc subsys */ |
| return true; |
| |
| list_for_each_entry(p, &subsys->hosts, entry) { |
| if (!strcmp(nvmet_host_name(p->host), hostnqn)) |
| return true; |
| } |
| |
| return false; |
| } |
| |
| /* |
| * Note: ctrl->subsys->lock should be held when calling this function |
| */ |
| static void nvmet_setup_p2p_ns_map(struct nvmet_ctrl *ctrl, |
| struct nvmet_req *req) |
| { |
| struct nvmet_ns *ns; |
| unsigned long idx; |
| |
| if (!req->p2p_client) |
| return; |
| |
| ctrl->p2p_client = get_device(req->p2p_client); |
| |
| xa_for_each(&ctrl->subsys->namespaces, idx, ns) |
| nvmet_p2pmem_ns_add_p2p(ctrl, ns); |
| } |
| |
| /* |
| * Note: ctrl->subsys->lock should be held when calling this function |
| */ |
| static void nvmet_release_p2p_ns_map(struct nvmet_ctrl *ctrl) |
| { |
| struct radix_tree_iter iter; |
| void __rcu **slot; |
| |
| radix_tree_for_each_slot(slot, &ctrl->p2p_ns_map, &iter, 0) |
| pci_dev_put(radix_tree_deref_slot(slot)); |
| |
| put_device(ctrl->p2p_client); |
| } |
| |
| static void nvmet_fatal_error_handler(struct work_struct *work) |
| { |
| struct nvmet_ctrl *ctrl = |
| container_of(work, struct nvmet_ctrl, fatal_err_work); |
| |
| pr_err("ctrl %d fatal error occurred!\n", ctrl->cntlid); |
| ctrl->ops->delete_ctrl(ctrl); |
| } |
| |
| u16 nvmet_alloc_ctrl(const char *subsysnqn, const char *hostnqn, |
| struct nvmet_req *req, u32 kato, struct nvmet_ctrl **ctrlp) |
| { |
| struct nvmet_subsys *subsys; |
| struct nvmet_ctrl *ctrl; |
| int ret; |
| u16 status; |
| |
| status = NVME_SC_CONNECT_INVALID_PARAM | NVME_SC_DNR; |
| subsys = nvmet_find_get_subsys(req->port, subsysnqn); |
| if (!subsys) { |
| pr_warn("connect request for invalid subsystem %s!\n", |
| subsysnqn); |
| req->cqe->result.u32 = IPO_IATTR_CONNECT_DATA(subsysnqn); |
| req->error_loc = offsetof(struct nvme_common_command, dptr); |
| goto out; |
| } |
| |
| down_read(&nvmet_config_sem); |
| if (!nvmet_host_allowed(subsys, hostnqn)) { |
| pr_info("connect by host %s for subsystem %s not allowed\n", |
| hostnqn, subsysnqn); |
| req->cqe->result.u32 = IPO_IATTR_CONNECT_DATA(hostnqn); |
| up_read(&nvmet_config_sem); |
| status = NVME_SC_CONNECT_INVALID_HOST | NVME_SC_DNR; |
| req->error_loc = offsetof(struct nvme_common_command, dptr); |
| goto out_put_subsystem; |
| } |
| up_read(&nvmet_config_sem); |
| |
| status = NVME_SC_INTERNAL; |
| ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL); |
| if (!ctrl) |
| goto out_put_subsystem; |
| mutex_init(&ctrl->lock); |
| |
| ctrl->port = req->port; |
| ctrl->ops = req->ops; |
| |
| #ifdef CONFIG_NVME_TARGET_PASSTHRU |
| /* By default, set loop targets to clear IDS by default */ |
| if (ctrl->port->disc_addr.trtype == NVMF_TRTYPE_LOOP) |
| subsys->clear_ids = 1; |
| #endif |
| |
| INIT_WORK(&ctrl->async_event_work, nvmet_async_event_work); |
| INIT_LIST_HEAD(&ctrl->async_events); |
| INIT_RADIX_TREE(&ctrl->p2p_ns_map, GFP_KERNEL); |
| INIT_WORK(&ctrl->fatal_err_work, nvmet_fatal_error_handler); |
| INIT_DELAYED_WORK(&ctrl->ka_work, nvmet_keep_alive_timer); |
| |
| memcpy(ctrl->subsysnqn, subsysnqn, NVMF_NQN_SIZE); |
| memcpy(ctrl->hostnqn, hostnqn, NVMF_NQN_SIZE); |
| |
| kref_init(&ctrl->ref); |
| ctrl->subsys = subsys; |
| nvmet_init_cap(ctrl); |
| WRITE_ONCE(ctrl->aen_enabled, NVMET_AEN_CFG_OPTIONAL); |
| |
| ctrl->changed_ns_list = kmalloc_array(NVME_MAX_CHANGED_NAMESPACES, |
| sizeof(__le32), GFP_KERNEL); |
| if (!ctrl->changed_ns_list) |
| goto out_free_ctrl; |
| |
| ctrl->sqs = kcalloc(subsys->max_qid + 1, |
| sizeof(struct nvmet_sq *), |
| GFP_KERNEL); |
| if (!ctrl->sqs) |
| goto out_free_changed_ns_list; |
| |
| if (subsys->cntlid_min > subsys->cntlid_max) |
| goto out_free_sqs; |
| |
| ret = ida_alloc_range(&cntlid_ida, |
| subsys->cntlid_min, subsys->cntlid_max, |
| GFP_KERNEL); |
| if (ret < 0) { |
| status = NVME_SC_CONNECT_CTRL_BUSY | NVME_SC_DNR; |
| goto out_free_sqs; |
| } |
| ctrl->cntlid = ret; |
| |
| /* |
| * Discovery controllers may use some arbitrary high value |
| * in order to cleanup stale discovery sessions |
| */ |
| if (nvmet_is_disc_subsys(ctrl->subsys) && !kato) |
| kato = NVMET_DISC_KATO_MS; |
| |
| /* keep-alive timeout in seconds */ |
| ctrl->kato = DIV_ROUND_UP(kato, 1000); |
| |
| ctrl->err_counter = 0; |
| spin_lock_init(&ctrl->error_lock); |
| |
| nvmet_start_keep_alive_timer(ctrl); |
| |
| mutex_lock(&subsys->lock); |
| list_add_tail(&ctrl->subsys_entry, &subsys->ctrls); |
| nvmet_setup_p2p_ns_map(ctrl, req); |
| mutex_unlock(&subsys->lock); |
| |
| *ctrlp = ctrl; |
| return 0; |
| |
| out_free_sqs: |
| kfree(ctrl->sqs); |
| out_free_changed_ns_list: |
| kfree(ctrl->changed_ns_list); |
| out_free_ctrl: |
| kfree(ctrl); |
| out_put_subsystem: |
| nvmet_subsys_put(subsys); |
| out: |
| return status; |
| } |
| |
| static void nvmet_ctrl_free(struct kref *ref) |
| { |
| struct nvmet_ctrl *ctrl = container_of(ref, struct nvmet_ctrl, ref); |
| struct nvmet_subsys *subsys = ctrl->subsys; |
| |
| mutex_lock(&subsys->lock); |
| nvmet_release_p2p_ns_map(ctrl); |
| list_del(&ctrl->subsys_entry); |
| mutex_unlock(&subsys->lock); |
| |
| nvmet_stop_keep_alive_timer(ctrl); |
| |
| flush_work(&ctrl->async_event_work); |
| cancel_work_sync(&ctrl->fatal_err_work); |
| |
| ida_free(&cntlid_ida, ctrl->cntlid); |
| |
| nvmet_async_events_free(ctrl); |
| kfree(ctrl->sqs); |
| kfree(ctrl->changed_ns_list); |
| kfree(ctrl); |
| |
| nvmet_subsys_put(subsys); |
| } |
| |
| void nvmet_ctrl_put(struct nvmet_ctrl *ctrl) |
| { |
| kref_put(&ctrl->ref, nvmet_ctrl_free); |
| } |
| |
| void nvmet_ctrl_fatal_error(struct nvmet_ctrl *ctrl) |
| { |
| mutex_lock(&ctrl->lock); |
| if (!(ctrl->csts & NVME_CSTS_CFS)) { |
| ctrl->csts |= NVME_CSTS_CFS; |
| queue_work(nvmet_wq, &ctrl->fatal_err_work); |
| } |
| mutex_unlock(&ctrl->lock); |
| } |
| EXPORT_SYMBOL_GPL(nvmet_ctrl_fatal_error); |
| |
| static struct nvmet_subsys *nvmet_find_get_subsys(struct nvmet_port *port, |
| const char *subsysnqn) |
| { |
| struct nvmet_subsys_link *p; |
| |
| if (!port) |
| return NULL; |
| |
| if (!strcmp(NVME_DISC_SUBSYS_NAME, subsysnqn)) { |
| if (!kref_get_unless_zero(&nvmet_disc_subsys->ref)) |
| return NULL; |
| return nvmet_disc_subsys; |
| } |
| |
| down_read(&nvmet_config_sem); |
| list_for_each_entry(p, &port->subsystems, entry) { |
| if (!strncmp(p->subsys->subsysnqn, subsysnqn, |
| NVMF_NQN_SIZE)) { |
| if (!kref_get_unless_zero(&p->subsys->ref)) |
| break; |
| up_read(&nvmet_config_sem); |
| return p->subsys; |
| } |
| } |
| up_read(&nvmet_config_sem); |
| return NULL; |
| } |
| |
| struct nvmet_subsys *nvmet_subsys_alloc(const char *subsysnqn, |
| enum nvme_subsys_type type) |
| { |
| struct nvmet_subsys *subsys; |
| char serial[NVMET_SN_MAX_SIZE / 2]; |
| int ret; |
| |
| subsys = kzalloc(sizeof(*subsys), GFP_KERNEL); |
| if (!subsys) |
| return ERR_PTR(-ENOMEM); |
| |
| subsys->ver = NVMET_DEFAULT_VS; |
| /* generate a random serial number as our controllers are ephemeral: */ |
| get_random_bytes(&serial, sizeof(serial)); |
| bin2hex(subsys->serial, &serial, sizeof(serial)); |
| |
| subsys->model_number = kstrdup(NVMET_DEFAULT_CTRL_MODEL, GFP_KERNEL); |
| if (!subsys->model_number) { |
| ret = -ENOMEM; |
| goto free_subsys; |
| } |
| |
| switch (type) { |
| case NVME_NQN_NVME: |
| subsys->max_qid = NVMET_NR_QUEUES; |
| break; |
| case NVME_NQN_DISC: |
| case NVME_NQN_CURR: |
| subsys->max_qid = 0; |
| break; |
| default: |
| pr_err("%s: Unknown Subsystem type - %d\n", __func__, type); |
| ret = -EINVAL; |
| goto free_mn; |
| } |
| subsys->type = type; |
| subsys->subsysnqn = kstrndup(subsysnqn, NVMF_NQN_SIZE, |
| GFP_KERNEL); |
| if (!subsys->subsysnqn) { |
| ret = -ENOMEM; |
| goto free_mn; |
| } |
| subsys->cntlid_min = NVME_CNTLID_MIN; |
| subsys->cntlid_max = NVME_CNTLID_MAX; |
| kref_init(&subsys->ref); |
| |
| mutex_init(&subsys->lock); |
| xa_init(&subsys->namespaces); |
| INIT_LIST_HEAD(&subsys->ctrls); |
| INIT_LIST_HEAD(&subsys->hosts); |
| |
| return subsys; |
| |
| free_mn: |
| kfree(subsys->model_number); |
| free_subsys: |
| kfree(subsys); |
| return ERR_PTR(ret); |
| } |
| |
| static void nvmet_subsys_free(struct kref *ref) |
| { |
| struct nvmet_subsys *subsys = |
| container_of(ref, struct nvmet_subsys, ref); |
| |
| WARN_ON_ONCE(!xa_empty(&subsys->namespaces)); |
| |
| xa_destroy(&subsys->namespaces); |
| nvmet_passthru_subsys_free(subsys); |
| |
| kfree(subsys->subsysnqn); |
| kfree(subsys->model_number); |
| kfree(subsys); |
| } |
| |
| void nvmet_subsys_del_ctrls(struct nvmet_subsys *subsys) |
| { |
| struct nvmet_ctrl *ctrl; |
| |
| mutex_lock(&subsys->lock); |
| list_for_each_entry(ctrl, &subsys->ctrls, subsys_entry) |
| ctrl->ops->delete_ctrl(ctrl); |
| mutex_unlock(&subsys->lock); |
| } |
| |
| void nvmet_subsys_put(struct nvmet_subsys *subsys) |
| { |
| kref_put(&subsys->ref, nvmet_subsys_free); |
| } |
| |
| static int __init nvmet_init(void) |
| { |
| int error; |
| |
| nvmet_ana_group_enabled[NVMET_DEFAULT_ANA_GRPID] = 1; |
| |
| zbd_wq = alloc_workqueue("nvmet-zbd-wq", WQ_MEM_RECLAIM, 0); |
| if (!zbd_wq) |
| return -ENOMEM; |
| |
| buffered_io_wq = alloc_workqueue("nvmet-buffered-io-wq", |
| WQ_MEM_RECLAIM, 0); |
| if (!buffered_io_wq) { |
| error = -ENOMEM; |
| goto out_free_zbd_work_queue; |
| } |
| |
| nvmet_wq = alloc_workqueue("nvmet-wq", WQ_MEM_RECLAIM, 0); |
| if (!nvmet_wq) { |
| error = -ENOMEM; |
| goto out_free_buffered_work_queue; |
| } |
| |
| error = nvmet_init_discovery(); |
| if (error) |
| goto out_free_nvmet_work_queue; |
| |
| error = nvmet_init_configfs(); |
| if (error) |
| goto out_exit_discovery; |
| return 0; |
| |
| out_exit_discovery: |
| nvmet_exit_discovery(); |
| out_free_nvmet_work_queue: |
| destroy_workqueue(nvmet_wq); |
| out_free_buffered_work_queue: |
| destroy_workqueue(buffered_io_wq); |
| out_free_zbd_work_queue: |
| destroy_workqueue(zbd_wq); |
| return error; |
| } |
| |
| static void __exit nvmet_exit(void) |
| { |
| nvmet_exit_configfs(); |
| nvmet_exit_discovery(); |
| ida_destroy(&cntlid_ida); |
| destroy_workqueue(nvmet_wq); |
| destroy_workqueue(buffered_io_wq); |
| destroy_workqueue(zbd_wq); |
| |
| BUILD_BUG_ON(sizeof(struct nvmf_disc_rsp_page_entry) != 1024); |
| BUILD_BUG_ON(sizeof(struct nvmf_disc_rsp_page_hdr) != 1024); |
| } |
| |
| module_init(nvmet_init); |
| module_exit(nvmet_exit); |
| |
| MODULE_LICENSE("GPL v2"); |