| /* |
| * Common code for the NVMe target. |
| * Copyright (c) 2015-2016 HGST, a Western Digital Company. |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms and conditions of the GNU General Public License, |
| * version 2, as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| * more details. |
| */ |
| #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| #include <linux/module.h> |
| #include <linux/random.h> |
| #include <linux/rculist.h> |
| |
| #include "nvmet.h" |
| |
| static struct nvmet_fabrics_ops *nvmet_transports[NVMF_TRTYPE_MAX]; |
| static DEFINE_IDA(cntlid_ida); |
| |
| /* |
| * 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); |
| |
| 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) |
| 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) |
| return NVME_SC_SGL_INVALID_DATA | NVME_SC_DNR; |
| return 0; |
| } |
| |
| 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_free(struct nvmet_ctrl *ctrl) |
| { |
| struct nvmet_req *req; |
| |
| while (1) { |
| mutex_lock(&ctrl->lock); |
| if (!ctrl->nr_async_event_cmds) { |
| mutex_unlock(&ctrl->lock); |
| return; |
| } |
| |
| req = ctrl->async_event_cmds[--ctrl->nr_async_event_cmds]; |
| mutex_unlock(&ctrl->lock); |
| nvmet_req_complete(req, NVME_SC_INTERNAL | NVME_SC_DNR); |
| } |
| } |
| |
| static void nvmet_async_event_work(struct work_struct *work) |
| { |
| struct nvmet_ctrl *ctrl = |
| container_of(work, struct nvmet_ctrl, async_event_work); |
| struct nvmet_async_event *aen; |
| struct nvmet_req *req; |
| |
| while (1) { |
| mutex_lock(&ctrl->lock); |
| aen = list_first_entry_or_null(&ctrl->async_events, |
| struct nvmet_async_event, entry); |
| if (!aen || !ctrl->nr_async_event_cmds) { |
| mutex_unlock(&ctrl->lock); |
| return; |
| } |
| |
| 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); |
| nvmet_req_complete(req, 0); |
| } |
| } |
| |
| static 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); |
| |
| schedule_work(&ctrl->async_event_work); |
| } |
| |
| int nvmet_register_transport(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(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); |
| |
| int nvmet_enable_port(struct nvmet_port *port) |
| { |
| 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; |
| |
| ret = ops->add_port(port); |
| if (ret) { |
| module_put(ops->owner); |
| return ret; |
| } |
| |
| port->enabled = true; |
| return 0; |
| } |
| |
| void nvmet_disable_port(struct nvmet_port *port) |
| { |
| struct nvmet_fabrics_ops *ops; |
| |
| lockdep_assert_held(&nvmet_config_sem); |
| |
| port->enabled = false; |
| |
| 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); |
| |
| pr_err("ctrl %d keep-alive timer (%d seconds) expired!\n", |
| ctrl->cntlid, ctrl->kato); |
| |
| nvmet_ctrl_fatal_error(ctrl); |
| } |
| |
| static void nvmet_start_keep_alive_timer(struct nvmet_ctrl *ctrl) |
| { |
| pr_debug("ctrl %d start keep-alive timer for %d secs\n", |
| ctrl->cntlid, ctrl->kato); |
| |
| INIT_DELAYED_WORK(&ctrl->ka_work, nvmet_keep_alive_timer); |
| schedule_delayed_work(&ctrl->ka_work, ctrl->kato * HZ); |
| } |
| |
| static void nvmet_stop_keep_alive_timer(struct nvmet_ctrl *ctrl) |
| { |
| pr_debug("ctrl %d stop keep-alive\n", ctrl->cntlid); |
| |
| cancel_delayed_work_sync(&ctrl->ka_work); |
| } |
| |
| static struct nvmet_ns *__nvmet_find_namespace(struct nvmet_ctrl *ctrl, |
| __le32 nsid) |
| { |
| struct nvmet_ns *ns; |
| |
| list_for_each_entry_rcu(ns, &ctrl->subsys->namespaces, dev_link) { |
| if (ns->nsid == le32_to_cpu(nsid)) |
| return ns; |
| } |
| |
| return NULL; |
| } |
| |
| struct nvmet_ns *nvmet_find_namespace(struct nvmet_ctrl *ctrl, __le32 nsid) |
| { |
| struct nvmet_ns *ns; |
| |
| rcu_read_lock(); |
| ns = __nvmet_find_namespace(ctrl, nsid); |
| if (ns) |
| percpu_ref_get(&ns->ref); |
| rcu_read_unlock(); |
| |
| return ns; |
| } |
| |
| 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); |
| } |
| |
| int nvmet_ns_enable(struct nvmet_ns *ns) |
| { |
| struct nvmet_subsys *subsys = ns->subsys; |
| struct nvmet_ctrl *ctrl; |
| int ret = 0; |
| |
| mutex_lock(&subsys->lock); |
| if (ns->enabled) |
| goto out_unlock; |
| |
| ns->bdev = blkdev_get_by_path(ns->device_path, FMODE_READ | FMODE_WRITE, |
| NULL); |
| if (IS_ERR(ns->bdev)) { |
| pr_err("failed to open block device %s: (%ld)\n", |
| ns->device_path, PTR_ERR(ns->bdev)); |
| ret = PTR_ERR(ns->bdev); |
| ns->bdev = NULL; |
| goto out_unlock; |
| } |
| |
| ns->size = i_size_read(ns->bdev->bd_inode); |
| ns->blksize_shift = blksize_bits(bdev_logical_block_size(ns->bdev)); |
| |
| ret = percpu_ref_init(&ns->ref, nvmet_destroy_namespace, |
| 0, GFP_KERNEL); |
| if (ret) |
| goto out_blkdev_put; |
| |
| if (ns->nsid > subsys->max_nsid) |
| subsys->max_nsid = ns->nsid; |
| |
| /* |
| * The namespaces list needs to be sorted to simplify the implementation |
| * of the Identify Namepace List subcommand. |
| */ |
| if (list_empty(&subsys->namespaces)) { |
| list_add_tail_rcu(&ns->dev_link, &subsys->namespaces); |
| } else { |
| struct nvmet_ns *old; |
| |
| list_for_each_entry_rcu(old, &subsys->namespaces, dev_link) { |
| BUG_ON(ns->nsid == old->nsid); |
| if (ns->nsid < old->nsid) |
| break; |
| } |
| |
| list_add_tail_rcu(&ns->dev_link, &old->dev_link); |
| } |
| |
| list_for_each_entry(ctrl, &subsys->ctrls, subsys_entry) |
| nvmet_add_async_event(ctrl, NVME_AER_TYPE_NOTICE, 0, 0); |
| |
| ns->enabled = true; |
| ret = 0; |
| out_unlock: |
| mutex_unlock(&subsys->lock); |
| return ret; |
| out_blkdev_put: |
| blkdev_put(ns->bdev, FMODE_WRITE|FMODE_READ); |
| ns->bdev = NULL; |
| 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; |
| list_del_rcu(&ns->dev_link); |
| 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); |
| list_for_each_entry(ctrl, &subsys->ctrls, subsys_entry) |
| nvmet_add_async_event(ctrl, NVME_AER_TYPE_NOTICE, 0, 0); |
| |
| if (ns->bdev) |
| blkdev_put(ns->bdev, FMODE_WRITE|FMODE_READ); |
| out_unlock: |
| mutex_unlock(&subsys->lock); |
| } |
| |
| void nvmet_ns_free(struct nvmet_ns *ns) |
| { |
| nvmet_ns_disable(ns); |
| |
| 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_LIST_HEAD(&ns->dev_link); |
| init_completion(&ns->disable_done); |
| |
| ns->nsid = nsid; |
| ns->subsys = subsys; |
| uuid_gen(&ns->uuid); |
| |
| return ns; |
| } |
| |
| static void __nvmet_req_complete(struct nvmet_req *req, u16 status) |
| { |
| if (status) |
| nvmet_set_status(req, status); |
| |
| /* XXX: need to fill in something useful for sq_head */ |
| req->rsp->sq_head = 0; |
| if (likely(req->sq)) /* may happen during early failure */ |
| req->rsp->sq_id = cpu_to_le16(req->sq->qid); |
| req->rsp->command_id = req->cmd->common.command_id; |
| |
| 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; |
| |
| ctrl->cqs[qid] = cq; |
| } |
| |
| void nvmet_sq_setup(struct nvmet_ctrl *ctrl, struct nvmet_sq *sq, |
| u16 qid, u16 size) |
| { |
| 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) |
| { |
| /* |
| * If this is the admin queue, complete all AERs so that our |
| * queue doesn't have outstanding requests on it. |
| */ |
| if (sq->ctrl && sq->ctrl->sqs && sq->ctrl->sqs[0] == sq) |
| nvmet_async_events_free(sq->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 (sq->ctrl) { |
| nvmet_ctrl_put(sq->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); |
| |
| bool nvmet_req_init(struct nvmet_req *req, struct nvmet_cq *cq, |
| struct nvmet_sq *sq, 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->sg_cnt = 0; |
| req->rsp->status = 0; |
| |
| /* no support for fused commands yet */ |
| if (unlikely(flags & (NVME_CMD_FUSE_FIRST | NVME_CMD_FUSE_SECOND))) { |
| status = NVME_SC_INVALID_FIELD | NVME_SC_DNR; |
| goto fail; |
| } |
| |
| /* either variant of SGLs is fine, as we don't support metadata */ |
| if (unlikely((flags & NVME_CMD_SGL_ALL) != NVME_CMD_SGL_METABUF && |
| (flags & NVME_CMD_SGL_ALL) != NVME_CMD_SGL_METASEG)) { |
| 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 if (req->cmd->common.opcode == nvme_fabrics_command) |
| status = nvmet_parse_fabrics_cmd(req); |
| else if (req->sq->ctrl->subsys->type == NVME_NQN_DISC) |
| status = nvmet_parse_discovery_cmd(req); |
| else |
| status = nvmet_parse_admin_cmd(req); |
| |
| if (status) |
| goto fail; |
| |
| if (unlikely(!percpu_ref_tryget_live(&sq->ref))) { |
| status = NVME_SC_INVALID_FIELD | NVME_SC_DNR; |
| goto fail; |
| } |
| |
| 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); |
| } |
| EXPORT_SYMBOL_GPL(nvmet_req_uninit); |
| |
| 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 void nvmet_start_ctrl(struct nvmet_ctrl *ctrl) |
| { |
| lockdep_assert_held(&ctrl->lock); |
| |
| if (nvmet_cc_iosqes(ctrl->cc) != NVME_NVM_IOSQES || |
| nvmet_cc_iocqes(ctrl->cc) != NVME_NVM_IOCQES || |
| nvmet_cc_mps(ctrl->cc) != 0 || |
| nvmet_cc_ams(ctrl->cc) != 0 || |
| nvmet_cc_css(ctrl->cc) != 0) { |
| ctrl->csts = NVME_CSTS_CFS; |
| return; |
| } |
| |
| ctrl->csts = NVME_CSTS_RDY; |
| } |
| |
| 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); |
| /* CC.EN timeout in 500msec units: */ |
| ctrl->cap |= (15ULL << 24); |
| /* maximum queue entries supported: */ |
| ctrl->cap |= NVMET_QUEUE_SIZE - 1; |
| } |
| |
| u16 nvmet_ctrl_find_get(const char *subsysnqn, const char *hostnqn, u16 cntlid, |
| struct nvmet_req *req, struct nvmet_ctrl **ret) |
| { |
| struct nvmet_subsys *subsys; |
| struct nvmet_ctrl *ctrl; |
| u16 status = 0; |
| |
| subsys = nvmet_find_get_subsys(req->port, subsysnqn); |
| if (!subsys) { |
| pr_warn("connect request for invalid subsystem %s!\n", |
| subsysnqn); |
| req->rsp->result.u32 = IPO_IATTR_CONNECT_DATA(subsysnqn); |
| return NVME_SC_CONNECT_INVALID_PARAM | NVME_SC_DNR; |
| } |
| |
| 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; |
| |
| *ret = ctrl; |
| goto out; |
| } |
| } |
| |
| pr_warn("could not find controller %d for subsys %s / host %s\n", |
| cntlid, subsysnqn, hostnqn); |
| req->rsp->result.u32 = IPO_IATTR_CONNECT_DATA(cntlid); |
| status = NVME_SC_CONNECT_INVALID_PARAM | NVME_SC_DNR; |
| |
| out: |
| mutex_unlock(&subsys->lock); |
| nvmet_subsys_put(subsys); |
| return status; |
| } |
| |
| u16 nvmet_check_ctrl_status(struct nvmet_req *req, struct nvme_command *cmd) |
| { |
| if (unlikely(!(req->sq->ctrl->cc & NVME_CC_ENABLE))) { |
| pr_err("got io cmd %d while CC.EN == 0 on qid = %d\n", |
| 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 io cmd %d while CSTS.RDY == 0 on qid = %d\n", |
| cmd->common.opcode, req->sq->qid); |
| req->ns = NULL; |
| return NVME_SC_CMD_SEQ_ERROR | NVME_SC_DNR; |
| } |
| return 0; |
| } |
| |
| static bool __nvmet_host_allowed(struct nvmet_subsys *subsys, |
| const char *hostnqn) |
| { |
| struct nvmet_host_link *p; |
| |
| if (subsys->allow_any_host) |
| return true; |
| |
| list_for_each_entry(p, &subsys->hosts, entry) { |
| if (!strcmp(nvmet_host_name(p->host), hostnqn)) |
| return true; |
| } |
| |
| return false; |
| } |
| |
| static bool nvmet_host_discovery_allowed(struct nvmet_req *req, |
| const char *hostnqn) |
| { |
| struct nvmet_subsys_link *s; |
| |
| list_for_each_entry(s, &req->port->subsystems, entry) { |
| if (__nvmet_host_allowed(s->subsys, hostnqn)) |
| return true; |
| } |
| |
| return false; |
| } |
| |
| bool nvmet_host_allowed(struct nvmet_req *req, struct nvmet_subsys *subsys, |
| const char *hostnqn) |
| { |
| lockdep_assert_held(&nvmet_config_sem); |
| |
| if (subsys->type == NVME_NQN_DISC) |
| return nvmet_host_discovery_allowed(req, hostnqn); |
| else |
| return __nvmet_host_allowed(subsys, hostnqn); |
| } |
| |
| 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->rsp->result.u32 = IPO_IATTR_CONNECT_DATA(subsysnqn); |
| goto out; |
| } |
| |
| status = NVME_SC_CONNECT_INVALID_PARAM | NVME_SC_DNR; |
| down_read(&nvmet_config_sem); |
| if (!nvmet_host_allowed(req, subsys, hostnqn)) { |
| pr_info("connect by host %s for subsystem %s not allowed\n", |
| hostnqn, subsysnqn); |
| req->rsp->result.u32 = IPO_IATTR_CONNECT_DATA(hostnqn); |
| up_read(&nvmet_config_sem); |
| status = NVME_SC_CONNECT_INVALID_HOST | NVME_SC_DNR; |
| 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); |
| |
| nvmet_init_cap(ctrl); |
| |
| INIT_WORK(&ctrl->async_event_work, nvmet_async_event_work); |
| INIT_LIST_HEAD(&ctrl->async_events); |
| |
| memcpy(ctrl->subsysnqn, subsysnqn, NVMF_NQN_SIZE); |
| memcpy(ctrl->hostnqn, hostnqn, NVMF_NQN_SIZE); |
| |
| kref_init(&ctrl->ref); |
| ctrl->subsys = subsys; |
| |
| ctrl->cqs = kcalloc(subsys->max_qid + 1, |
| sizeof(struct nvmet_cq *), |
| GFP_KERNEL); |
| if (!ctrl->cqs) |
| goto out_free_ctrl; |
| |
| ctrl->sqs = kcalloc(subsys->max_qid + 1, |
| sizeof(struct nvmet_sq *), |
| GFP_KERNEL); |
| if (!ctrl->sqs) |
| goto out_free_cqs; |
| |
| ret = ida_simple_get(&cntlid_ida, |
| NVME_CNTLID_MIN, NVME_CNTLID_MAX, |
| GFP_KERNEL); |
| if (ret < 0) { |
| status = NVME_SC_CONNECT_CTRL_BUSY | NVME_SC_DNR; |
| goto out_free_sqs; |
| } |
| ctrl->cntlid = ret; |
| |
| ctrl->ops = req->ops; |
| if (ctrl->subsys->type == NVME_NQN_DISC) { |
| /* Don't accept keep-alive timeout for discovery controllers */ |
| if (kato) { |
| status = NVME_SC_INVALID_FIELD | NVME_SC_DNR; |
| goto out_free_sqs; |
| } |
| |
| /* |
| * Discovery controllers use some arbitrary high value in order |
| * to cleanup stale discovery sessions |
| * |
| * From the latest base diff RC: |
| * "The Keep Alive command is not supported by |
| * Discovery controllers. A transport may specify a |
| * fixed Discovery controller activity timeout value |
| * (e.g., 2 minutes). If no commands are received |
| * by a Discovery controller within that time |
| * period, the controller may perform the |
| * actions for Keep Alive Timer expiration". |
| */ |
| ctrl->kato = NVMET_DISC_KATO; |
| } else { |
| /* keep-alive timeout in seconds */ |
| ctrl->kato = DIV_ROUND_UP(kato, 1000); |
| } |
| nvmet_start_keep_alive_timer(ctrl); |
| |
| mutex_lock(&subsys->lock); |
| list_add_tail(&ctrl->subsys_entry, &subsys->ctrls); |
| mutex_unlock(&subsys->lock); |
| |
| *ctrlp = ctrl; |
| return 0; |
| |
| out_free_sqs: |
| kfree(ctrl->sqs); |
| out_free_cqs: |
| kfree(ctrl->cqs); |
| 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; |
| |
| nvmet_stop_keep_alive_timer(ctrl); |
| |
| mutex_lock(&subsys->lock); |
| list_del(&ctrl->subsys_entry); |
| mutex_unlock(&subsys->lock); |
| |
| flush_work(&ctrl->async_event_work); |
| cancel_work_sync(&ctrl->fatal_err_work); |
| |
| ida_simple_remove(&cntlid_ida, ctrl->cntlid); |
| nvmet_subsys_put(subsys); |
| |
| kfree(ctrl->sqs); |
| kfree(ctrl->cqs); |
| kfree(ctrl); |
| } |
| |
| void nvmet_ctrl_put(struct nvmet_ctrl *ctrl) |
| { |
| kref_put(&ctrl->ref, nvmet_ctrl_free); |
| } |
| |
| 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); |
| } |
| |
| void nvmet_ctrl_fatal_error(struct nvmet_ctrl *ctrl) |
| { |
| mutex_lock(&ctrl->lock); |
| if (!(ctrl->csts & NVME_CSTS_CFS)) { |
| ctrl->csts |= NVME_CSTS_CFS; |
| INIT_WORK(&ctrl->fatal_err_work, nvmet_fatal_error_handler); |
| schedule_work(&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 (!strncmp(NVME_DISC_SUBSYS_NAME, subsysnqn, |
| NVMF_NQN_SIZE)) { |
| 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; |
| |
| subsys = kzalloc(sizeof(*subsys), GFP_KERNEL); |
| if (!subsys) |
| return NULL; |
| |
| subsys->ver = NVME_VS(1, 3, 0); /* NVMe 1.3.0 */ |
| /* generate a random serial number as our controllers are ephemeral: */ |
| get_random_bytes(&subsys->serial, sizeof(subsys->serial)); |
| |
| switch (type) { |
| case NVME_NQN_NVME: |
| subsys->max_qid = NVMET_NR_QUEUES; |
| break; |
| case NVME_NQN_DISC: |
| subsys->max_qid = 0; |
| break; |
| default: |
| pr_err("%s: Unknown Subsystem type - %d\n", __func__, type); |
| kfree(subsys); |
| return NULL; |
| } |
| subsys->type = type; |
| subsys->subsysnqn = kstrndup(subsysnqn, NVMF_NQN_SIZE, |
| GFP_KERNEL); |
| if (!subsys->subsysnqn) { |
| kfree(subsys); |
| return NULL; |
| } |
| |
| kref_init(&subsys->ref); |
| |
| mutex_init(&subsys->lock); |
| INIT_LIST_HEAD(&subsys->namespaces); |
| INIT_LIST_HEAD(&subsys->ctrls); |
| INIT_LIST_HEAD(&subsys->hosts); |
| |
| return subsys; |
| } |
| |
| static void nvmet_subsys_free(struct kref *ref) |
| { |
| struct nvmet_subsys *subsys = |
| container_of(ref, struct nvmet_subsys, ref); |
| |
| WARN_ON_ONCE(!list_empty(&subsys->namespaces)); |
| |
| kfree(subsys->subsysnqn); |
| 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; |
| |
| error = nvmet_init_discovery(); |
| if (error) |
| goto out; |
| |
| error = nvmet_init_configfs(); |
| if (error) |
| goto out_exit_discovery; |
| return 0; |
| |
| out_exit_discovery: |
| nvmet_exit_discovery(); |
| out: |
| return error; |
| } |
| |
| static void __exit nvmet_exit(void) |
| { |
| nvmet_exit_configfs(); |
| nvmet_exit_discovery(); |
| ida_destroy(&cntlid_ida); |
| |
| 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"); |