1241 lines
29 KiB
C
1241 lines
29 KiB
C
/*
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* Common code for the NVMe target.
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* Copyright (c) 2015-2016 HGST, a Western Digital Company.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
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#include <linux/random.h>
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#include <linux/rculist.h>
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#include "nvmet.h"
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struct workqueue_struct *buffered_io_wq;
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static const struct nvmet_fabrics_ops *nvmet_transports[NVMF_TRTYPE_MAX];
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static DEFINE_IDA(cntlid_ida);
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/*
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* This read/write semaphore is used to synchronize access to configuration
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* information on a target system that will result in discovery log page
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* information change for at least one host.
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* The full list of resources to protected by this semaphore is:
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*
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* - subsystems list
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* - per-subsystem allowed hosts list
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* - allow_any_host subsystem attribute
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* - nvmet_genctr
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* - the nvmet_transports array
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*
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* When updating any of those lists/structures write lock should be obtained,
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* while when reading (popolating discovery log page or checking host-subsystem
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* link) read lock is obtained to allow concurrent reads.
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*/
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DECLARE_RWSEM(nvmet_config_sem);
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u32 nvmet_ana_group_enabled[NVMET_MAX_ANAGRPS + 1];
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u64 nvmet_ana_chgcnt;
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DECLARE_RWSEM(nvmet_ana_sem);
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static struct nvmet_subsys *nvmet_find_get_subsys(struct nvmet_port *port,
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const char *subsysnqn);
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u16 nvmet_copy_to_sgl(struct nvmet_req *req, off_t off, const void *buf,
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size_t len)
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{
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if (sg_pcopy_from_buffer(req->sg, req->sg_cnt, buf, len, off) != len)
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return NVME_SC_SGL_INVALID_DATA | NVME_SC_DNR;
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return 0;
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}
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u16 nvmet_copy_from_sgl(struct nvmet_req *req, off_t off, void *buf, size_t len)
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{
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if (sg_pcopy_to_buffer(req->sg, req->sg_cnt, buf, len, off) != len)
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return NVME_SC_SGL_INVALID_DATA | NVME_SC_DNR;
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return 0;
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}
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u16 nvmet_zero_sgl(struct nvmet_req *req, off_t off, size_t len)
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{
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if (sg_zero_buffer(req->sg, req->sg_cnt, len, off) != len)
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return NVME_SC_SGL_INVALID_DATA | NVME_SC_DNR;
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return 0;
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}
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static unsigned int nvmet_max_nsid(struct nvmet_subsys *subsys)
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{
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struct nvmet_ns *ns;
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if (list_empty(&subsys->namespaces))
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return 0;
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ns = list_last_entry(&subsys->namespaces, struct nvmet_ns, dev_link);
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return ns->nsid;
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}
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static u32 nvmet_async_event_result(struct nvmet_async_event *aen)
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{
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return aen->event_type | (aen->event_info << 8) | (aen->log_page << 16);
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}
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static void nvmet_async_events_free(struct nvmet_ctrl *ctrl)
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{
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struct nvmet_req *req;
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while (1) {
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mutex_lock(&ctrl->lock);
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if (!ctrl->nr_async_event_cmds) {
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mutex_unlock(&ctrl->lock);
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return;
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}
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req = ctrl->async_event_cmds[--ctrl->nr_async_event_cmds];
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mutex_unlock(&ctrl->lock);
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nvmet_req_complete(req, NVME_SC_INTERNAL | NVME_SC_DNR);
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}
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}
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static void nvmet_async_event_work(struct work_struct *work)
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{
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struct nvmet_ctrl *ctrl =
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container_of(work, struct nvmet_ctrl, async_event_work);
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struct nvmet_async_event *aen;
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struct nvmet_req *req;
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while (1) {
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mutex_lock(&ctrl->lock);
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aen = list_first_entry_or_null(&ctrl->async_events,
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struct nvmet_async_event, entry);
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if (!aen || !ctrl->nr_async_event_cmds) {
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mutex_unlock(&ctrl->lock);
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return;
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}
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req = ctrl->async_event_cmds[--ctrl->nr_async_event_cmds];
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nvmet_set_result(req, nvmet_async_event_result(aen));
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list_del(&aen->entry);
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kfree(aen);
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mutex_unlock(&ctrl->lock);
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nvmet_req_complete(req, 0);
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}
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}
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static void nvmet_add_async_event(struct nvmet_ctrl *ctrl, u8 event_type,
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u8 event_info, u8 log_page)
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{
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struct nvmet_async_event *aen;
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aen = kmalloc(sizeof(*aen), GFP_KERNEL);
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if (!aen)
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return;
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aen->event_type = event_type;
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aen->event_info = event_info;
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aen->log_page = log_page;
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mutex_lock(&ctrl->lock);
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list_add_tail(&aen->entry, &ctrl->async_events);
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mutex_unlock(&ctrl->lock);
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schedule_work(&ctrl->async_event_work);
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}
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static bool nvmet_aen_disabled(struct nvmet_ctrl *ctrl, u32 aen)
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{
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if (!(READ_ONCE(ctrl->aen_enabled) & aen))
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return true;
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return test_and_set_bit(aen, &ctrl->aen_masked);
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}
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static void nvmet_add_to_changed_ns_log(struct nvmet_ctrl *ctrl, __le32 nsid)
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{
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u32 i;
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mutex_lock(&ctrl->lock);
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if (ctrl->nr_changed_ns > NVME_MAX_CHANGED_NAMESPACES)
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goto out_unlock;
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for (i = 0; i < ctrl->nr_changed_ns; i++) {
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if (ctrl->changed_ns_list[i] == nsid)
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goto out_unlock;
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}
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if (ctrl->nr_changed_ns == NVME_MAX_CHANGED_NAMESPACES) {
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ctrl->changed_ns_list[0] = cpu_to_le32(0xffffffff);
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ctrl->nr_changed_ns = U32_MAX;
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goto out_unlock;
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}
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ctrl->changed_ns_list[ctrl->nr_changed_ns++] = nsid;
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out_unlock:
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mutex_unlock(&ctrl->lock);
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}
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void nvmet_ns_changed(struct nvmet_subsys *subsys, u32 nsid)
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{
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struct nvmet_ctrl *ctrl;
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list_for_each_entry(ctrl, &subsys->ctrls, subsys_entry) {
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nvmet_add_to_changed_ns_log(ctrl, cpu_to_le32(nsid));
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if (nvmet_aen_disabled(ctrl, NVME_AEN_CFG_NS_ATTR))
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continue;
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nvmet_add_async_event(ctrl, NVME_AER_TYPE_NOTICE,
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NVME_AER_NOTICE_NS_CHANGED,
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NVME_LOG_CHANGED_NS);
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}
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}
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void nvmet_send_ana_event(struct nvmet_subsys *subsys,
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struct nvmet_port *port)
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{
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struct nvmet_ctrl *ctrl;
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mutex_lock(&subsys->lock);
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list_for_each_entry(ctrl, &subsys->ctrls, subsys_entry) {
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if (port && ctrl->port != port)
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continue;
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if (nvmet_aen_disabled(ctrl, NVME_AEN_CFG_ANA_CHANGE))
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continue;
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nvmet_add_async_event(ctrl, NVME_AER_TYPE_NOTICE,
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NVME_AER_NOTICE_ANA, NVME_LOG_ANA);
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}
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mutex_unlock(&subsys->lock);
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}
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void nvmet_port_send_ana_event(struct nvmet_port *port)
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{
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struct nvmet_subsys_link *p;
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down_read(&nvmet_config_sem);
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list_for_each_entry(p, &port->subsystems, entry)
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nvmet_send_ana_event(p->subsys, port);
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up_read(&nvmet_config_sem);
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}
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int nvmet_register_transport(const struct nvmet_fabrics_ops *ops)
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{
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int ret = 0;
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down_write(&nvmet_config_sem);
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if (nvmet_transports[ops->type])
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ret = -EINVAL;
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else
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nvmet_transports[ops->type] = ops;
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up_write(&nvmet_config_sem);
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return ret;
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}
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EXPORT_SYMBOL_GPL(nvmet_register_transport);
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void nvmet_unregister_transport(const struct nvmet_fabrics_ops *ops)
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{
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down_write(&nvmet_config_sem);
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nvmet_transports[ops->type] = NULL;
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up_write(&nvmet_config_sem);
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}
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EXPORT_SYMBOL_GPL(nvmet_unregister_transport);
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int nvmet_enable_port(struct nvmet_port *port)
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{
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const struct nvmet_fabrics_ops *ops;
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int ret;
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lockdep_assert_held(&nvmet_config_sem);
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ops = nvmet_transports[port->disc_addr.trtype];
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if (!ops) {
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up_write(&nvmet_config_sem);
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request_module("nvmet-transport-%d", port->disc_addr.trtype);
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down_write(&nvmet_config_sem);
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ops = nvmet_transports[port->disc_addr.trtype];
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if (!ops) {
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pr_err("transport type %d not supported\n",
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port->disc_addr.trtype);
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return -EINVAL;
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}
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}
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if (!try_module_get(ops->owner))
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return -EINVAL;
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ret = ops->add_port(port);
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if (ret) {
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module_put(ops->owner);
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return ret;
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}
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/* If the transport didn't set inline_data_size, then disable it. */
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if (port->inline_data_size < 0)
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port->inline_data_size = 0;
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port->enabled = true;
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return 0;
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}
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void nvmet_disable_port(struct nvmet_port *port)
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{
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const struct nvmet_fabrics_ops *ops;
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lockdep_assert_held(&nvmet_config_sem);
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port->enabled = false;
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ops = nvmet_transports[port->disc_addr.trtype];
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ops->remove_port(port);
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module_put(ops->owner);
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}
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static void nvmet_keep_alive_timer(struct work_struct *work)
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{
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struct nvmet_ctrl *ctrl = container_of(to_delayed_work(work),
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struct nvmet_ctrl, ka_work);
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pr_err("ctrl %d keep-alive timer (%d seconds) expired!\n",
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ctrl->cntlid, ctrl->kato);
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nvmet_ctrl_fatal_error(ctrl);
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}
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static void nvmet_start_keep_alive_timer(struct nvmet_ctrl *ctrl)
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{
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pr_debug("ctrl %d start keep-alive timer for %d secs\n",
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ctrl->cntlid, ctrl->kato);
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INIT_DELAYED_WORK(&ctrl->ka_work, nvmet_keep_alive_timer);
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schedule_delayed_work(&ctrl->ka_work, ctrl->kato * HZ);
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}
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static void nvmet_stop_keep_alive_timer(struct nvmet_ctrl *ctrl)
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{
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pr_debug("ctrl %d stop keep-alive\n", ctrl->cntlid);
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cancel_delayed_work_sync(&ctrl->ka_work);
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}
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static struct nvmet_ns *__nvmet_find_namespace(struct nvmet_ctrl *ctrl,
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__le32 nsid)
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{
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struct nvmet_ns *ns;
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list_for_each_entry_rcu(ns, &ctrl->subsys->namespaces, dev_link) {
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if (ns->nsid == le32_to_cpu(nsid))
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return ns;
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}
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return NULL;
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}
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struct nvmet_ns *nvmet_find_namespace(struct nvmet_ctrl *ctrl, __le32 nsid)
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{
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struct nvmet_ns *ns;
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rcu_read_lock();
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ns = __nvmet_find_namespace(ctrl, nsid);
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if (ns)
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percpu_ref_get(&ns->ref);
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rcu_read_unlock();
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return ns;
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}
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static void nvmet_destroy_namespace(struct percpu_ref *ref)
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{
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struct nvmet_ns *ns = container_of(ref, struct nvmet_ns, ref);
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complete(&ns->disable_done);
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}
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void nvmet_put_namespace(struct nvmet_ns *ns)
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{
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percpu_ref_put(&ns->ref);
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}
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static void nvmet_ns_dev_disable(struct nvmet_ns *ns)
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{
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nvmet_bdev_ns_disable(ns);
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nvmet_file_ns_disable(ns);
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}
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int nvmet_ns_enable(struct nvmet_ns *ns)
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{
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struct nvmet_subsys *subsys = ns->subsys;
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int ret;
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mutex_lock(&subsys->lock);
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ret = -EMFILE;
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if (subsys->nr_namespaces == NVMET_MAX_NAMESPACES)
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goto out_unlock;
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ret = 0;
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if (ns->enabled)
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goto out_unlock;
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ret = nvmet_bdev_ns_enable(ns);
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if (ret == -ENOTBLK)
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ret = nvmet_file_ns_enable(ns);
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if (ret)
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goto out_unlock;
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ret = percpu_ref_init(&ns->ref, nvmet_destroy_namespace,
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0, GFP_KERNEL);
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if (ret)
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goto out_dev_put;
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if (ns->nsid > subsys->max_nsid)
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subsys->max_nsid = ns->nsid;
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/*
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* The namespaces list needs to be sorted to simplify the implementation
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* of the Identify Namepace List subcommand.
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*/
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if (list_empty(&subsys->namespaces)) {
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list_add_tail_rcu(&ns->dev_link, &subsys->namespaces);
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} else {
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struct nvmet_ns *old;
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list_for_each_entry_rcu(old, &subsys->namespaces, dev_link) {
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BUG_ON(ns->nsid == old->nsid);
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if (ns->nsid < old->nsid)
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break;
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}
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list_add_tail_rcu(&ns->dev_link, &old->dev_link);
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}
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subsys->nr_namespaces++;
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nvmet_ns_changed(subsys, ns->nsid);
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ns->enabled = true;
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ret = 0;
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out_unlock:
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mutex_unlock(&subsys->lock);
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return ret;
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out_dev_put:
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nvmet_ns_dev_disable(ns);
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goto out_unlock;
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}
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void nvmet_ns_disable(struct nvmet_ns *ns)
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{
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struct nvmet_subsys *subsys = ns->subsys;
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mutex_lock(&subsys->lock);
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if (!ns->enabled)
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goto out_unlock;
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ns->enabled = false;
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list_del_rcu(&ns->dev_link);
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if (ns->nsid == subsys->max_nsid)
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subsys->max_nsid = nvmet_max_nsid(subsys);
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mutex_unlock(&subsys->lock);
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/*
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* Now that we removed the namespaces from the lookup list, we
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* can kill the per_cpu ref and wait for any remaining references
|
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* to be dropped, as well as a RCU grace period for anyone only
|
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* using the namepace under rcu_read_lock(). Note that we can't
|
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* use call_rcu here as we need to ensure the namespaces have
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* been fully destroyed before unloading the module.
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*/
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percpu_ref_kill(&ns->ref);
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synchronize_rcu();
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wait_for_completion(&ns->disable_done);
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percpu_ref_exit(&ns->ref);
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|
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mutex_lock(&subsys->lock);
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subsys->nr_namespaces--;
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nvmet_ns_changed(subsys, ns->nsid);
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nvmet_ns_dev_disable(ns);
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out_unlock:
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mutex_unlock(&subsys->lock);
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}
|
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|
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void nvmet_ns_free(struct nvmet_ns *ns)
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{
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nvmet_ns_disable(ns);
|
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|
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down_write(&nvmet_ana_sem);
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nvmet_ana_group_enabled[ns->anagrpid]--;
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up_write(&nvmet_ana_sem);
|
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|
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kfree(ns->device_path);
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kfree(ns);
|
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}
|
|
|
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struct nvmet_ns *nvmet_ns_alloc(struct nvmet_subsys *subsys, u32 nsid)
|
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{
|
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struct nvmet_ns *ns;
|
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|
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ns = kzalloc(sizeof(*ns), GFP_KERNEL);
|
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if (!ns)
|
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return NULL;
|
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|
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INIT_LIST_HEAD(&ns->dev_link);
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init_completion(&ns->disable_done);
|
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|
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ns->nsid = nsid;
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ns->subsys = subsys;
|
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|
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down_write(&nvmet_ana_sem);
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ns->anagrpid = NVMET_DEFAULT_ANA_GRPID;
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nvmet_ana_group_enabled[ns->anagrpid]++;
|
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up_write(&nvmet_ana_sem);
|
|
|
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uuid_gen(&ns->uuid);
|
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ns->buffered_io = false;
|
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|
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return ns;
|
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}
|
|
|
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static void __nvmet_req_complete(struct nvmet_req *req, u16 status)
|
|
{
|
|
u32 old_sqhd, new_sqhd;
|
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u16 sqhd;
|
|
|
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if (status)
|
|
nvmet_set_status(req, status);
|
|
|
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if (req->sq->size) {
|
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do {
|
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old_sqhd = req->sq->sqhd;
|
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new_sqhd = (old_sqhd + 1) % req->sq->size;
|
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} while (cmpxchg(&req->sq->sqhd, old_sqhd, new_sqhd) !=
|
|
old_sqhd);
|
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}
|
|
sqhd = req->sq->sqhd & 0x0000FFFF;
|
|
req->rsp->sq_head = cpu_to_le16(sqhd);
|
|
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->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)
|
|
{
|
|
/*
|
|
* 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);
|
|
|
|
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)
|
|
{
|
|
struct nvme_command *cmd = req->cmd;
|
|
u16 ret;
|
|
|
|
ret = nvmet_check_ctrl_status(req, cmd);
|
|
if (unlikely(ret))
|
|
return ret;
|
|
|
|
req->ns = nvmet_find_namespace(req->sq->ctrl, cmd->rw.nsid);
|
|
if (unlikely(!req->ns))
|
|
return NVME_SC_INVALID_NS | NVME_SC_DNR;
|
|
ret = nvmet_check_ana_state(req->port, req->ns);
|
|
if (unlikely(ret))
|
|
return ret;
|
|
ret = nvmet_io_cmd_check_access(req);
|
|
if (unlikely(ret))
|
|
return ret;
|
|
|
|
if (req->ns->file)
|
|
return nvmet_file_parse_io_cmd(req);
|
|
else
|
|
return nvmet_bdev_parse_io_cmd(req);
|
|
}
|
|
|
|
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->sg_cnt = 0;
|
|
req->transfer_len = 0;
|
|
req->rsp->status = 0;
|
|
req->ns = NULL;
|
|
|
|
/* 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;
|
|
}
|
|
|
|
/*
|
|
* 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)) {
|
|
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);
|
|
if (req->ns)
|
|
nvmet_put_namespace(req->ns);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nvmet_req_uninit);
|
|
|
|
void nvmet_req_execute(struct nvmet_req *req)
|
|
{
|
|
if (unlikely(req->data_len != req->transfer_len))
|
|
nvmet_req_complete(req, NVME_SC_SGL_INVALID_DATA | NVME_SC_DNR);
|
|
else
|
|
req->execute(req);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nvmet_req_execute);
|
|
|
|
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;
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
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);
|
|
/* 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 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 cmd %d while CSTS.RDY == 0 on qid = %d\n",
|
|
cmd->common.opcode, req->sq->qid);
|
|
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);
|
|
|
|
ctrl->port = req->port;
|
|
|
|
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;
|
|
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->cqs = kcalloc(subsys->max_qid + 1,
|
|
sizeof(struct nvmet_cq *),
|
|
GFP_KERNEL);
|
|
if (!ctrl->cqs)
|
|
goto out_free_changed_ns_list;
|
|
|
|
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_remove_ida;
|
|
}
|
|
|
|
/*
|
|
* 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_remove_ida:
|
|
ida_simple_remove(&cntlid_ida, ctrl->cntlid);
|
|
out_free_sqs:
|
|
kfree(ctrl->sqs);
|
|
out_free_cqs:
|
|
kfree(ctrl->cqs);
|
|
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);
|
|
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_simple_remove(&cntlid_ida, ctrl->cntlid);
|
|
|
|
kfree(ctrl->sqs);
|
|
kfree(ctrl->cqs);
|
|
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);
|
|
}
|
|
|
|
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;
|
|
|
|
nvmet_ana_group_enabled[NVMET_DEFAULT_ANA_GRPID] = 1;
|
|
|
|
buffered_io_wq = alloc_workqueue("nvmet-buffered-io-wq",
|
|
WQ_MEM_RECLAIM, 0);
|
|
if (!buffered_io_wq) {
|
|
error = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
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);
|
|
destroy_workqueue(buffered_io_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");
|