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-rw-r--r--drivers/nvme/target/loop.c744
1 files changed, 744 insertions, 0 deletions
diff --git a/drivers/nvme/target/loop.c b/drivers/nvme/target/loop.c
new file mode 100644
index 000000000..08b52f3ed
--- /dev/null
+++ b/drivers/nvme/target/loop.c
@@ -0,0 +1,744 @@
+/*
+ * NVMe over Fabrics loopback device.
+ * 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/scatterlist.h>
+#include <linux/blk-mq.h>
+#include <linux/nvme.h>
+#include <linux/module.h>
+#include <linux/parser.h>
+#include "nvmet.h"
+#include "../host/nvme.h"
+#include "../host/fabrics.h"
+
+#define NVME_LOOP_MAX_SEGMENTS 256
+
+struct nvme_loop_iod {
+ struct nvme_request nvme_req;
+ struct nvme_command cmd;
+ struct nvme_completion rsp;
+ struct nvmet_req req;
+ struct nvme_loop_queue *queue;
+ struct work_struct work;
+ struct sg_table sg_table;
+ struct scatterlist first_sgl[];
+};
+
+struct nvme_loop_ctrl {
+ struct nvme_loop_queue *queues;
+
+ struct blk_mq_tag_set admin_tag_set;
+
+ struct list_head list;
+ struct blk_mq_tag_set tag_set;
+ struct nvme_loop_iod async_event_iod;
+ struct nvme_ctrl ctrl;
+
+ struct nvmet_ctrl *target_ctrl;
+ struct nvmet_port *port;
+};
+
+static inline struct nvme_loop_ctrl *to_loop_ctrl(struct nvme_ctrl *ctrl)
+{
+ return container_of(ctrl, struct nvme_loop_ctrl, ctrl);
+}
+
+enum nvme_loop_queue_flags {
+ NVME_LOOP_Q_LIVE = 0,
+};
+
+struct nvme_loop_queue {
+ struct nvmet_cq nvme_cq;
+ struct nvmet_sq nvme_sq;
+ struct nvme_loop_ctrl *ctrl;
+ unsigned long flags;
+};
+
+static LIST_HEAD(nvme_loop_ports);
+static DEFINE_MUTEX(nvme_loop_ports_mutex);
+
+static LIST_HEAD(nvme_loop_ctrl_list);
+static DEFINE_MUTEX(nvme_loop_ctrl_mutex);
+
+static void nvme_loop_queue_response(struct nvmet_req *nvme_req);
+static void nvme_loop_delete_ctrl(struct nvmet_ctrl *ctrl);
+
+static const struct nvmet_fabrics_ops nvme_loop_ops;
+
+static inline int nvme_loop_queue_idx(struct nvme_loop_queue *queue)
+{
+ return queue - queue->ctrl->queues;
+}
+
+static void nvme_loop_complete_rq(struct request *req)
+{
+ struct nvme_loop_iod *iod = blk_mq_rq_to_pdu(req);
+
+ nvme_cleanup_cmd(req);
+ sg_free_table_chained(&iod->sg_table, true);
+ nvme_complete_rq(req);
+}
+
+static struct blk_mq_tags *nvme_loop_tagset(struct nvme_loop_queue *queue)
+{
+ u32 queue_idx = nvme_loop_queue_idx(queue);
+
+ if (queue_idx == 0)
+ return queue->ctrl->admin_tag_set.tags[queue_idx];
+ return queue->ctrl->tag_set.tags[queue_idx - 1];
+}
+
+static void nvme_loop_queue_response(struct nvmet_req *req)
+{
+ struct nvme_loop_queue *queue =
+ container_of(req->sq, struct nvme_loop_queue, nvme_sq);
+ struct nvme_completion *cqe = req->rsp;
+
+ /*
+ * AEN requests are special as they don't time out and can
+ * survive any kind of queue freeze and often don't respond to
+ * aborts. We don't even bother to allocate a struct request
+ * for them but rather special case them here.
+ */
+ if (unlikely(nvme_loop_queue_idx(queue) == 0 &&
+ cqe->command_id >= NVME_AQ_BLK_MQ_DEPTH)) {
+ nvme_complete_async_event(&queue->ctrl->ctrl, cqe->status,
+ &cqe->result);
+ } else {
+ struct request *rq;
+
+ rq = blk_mq_tag_to_rq(nvme_loop_tagset(queue), cqe->command_id);
+ if (!rq) {
+ dev_err(queue->ctrl->ctrl.device,
+ "tag 0x%x on queue %d not found\n",
+ cqe->command_id, nvme_loop_queue_idx(queue));
+ return;
+ }
+
+ nvme_end_request(rq, cqe->status, cqe->result);
+ }
+}
+
+static void nvme_loop_execute_work(struct work_struct *work)
+{
+ struct nvme_loop_iod *iod =
+ container_of(work, struct nvme_loop_iod, work);
+
+ nvmet_req_execute(&iod->req);
+}
+
+static enum blk_eh_timer_return
+nvme_loop_timeout(struct request *rq, bool reserved)
+{
+ struct nvme_loop_iod *iod = blk_mq_rq_to_pdu(rq);
+
+ /* queue error recovery */
+ nvme_reset_ctrl(&iod->queue->ctrl->ctrl);
+
+ /* fail with DNR on admin cmd timeout */
+ nvme_req(rq)->status = NVME_SC_ABORT_REQ | NVME_SC_DNR;
+
+ return BLK_EH_DONE;
+}
+
+static blk_status_t nvme_loop_queue_rq(struct blk_mq_hw_ctx *hctx,
+ const struct blk_mq_queue_data *bd)
+{
+ struct nvme_ns *ns = hctx->queue->queuedata;
+ struct nvme_loop_queue *queue = hctx->driver_data;
+ struct request *req = bd->rq;
+ struct nvme_loop_iod *iod = blk_mq_rq_to_pdu(req);
+ bool queue_ready = test_bit(NVME_LOOP_Q_LIVE, &queue->flags);
+ blk_status_t ret;
+
+ if (!nvmf_check_ready(&queue->ctrl->ctrl, req, queue_ready))
+ return nvmf_fail_nonready_command(&queue->ctrl->ctrl, req);
+
+ ret = nvme_setup_cmd(ns, req, &iod->cmd);
+ if (ret)
+ return ret;
+
+ blk_mq_start_request(req);
+ iod->cmd.common.flags |= NVME_CMD_SGL_METABUF;
+ iod->req.port = queue->ctrl->port;
+ if (!nvmet_req_init(&iod->req, &queue->nvme_cq,
+ &queue->nvme_sq, &nvme_loop_ops))
+ return BLK_STS_OK;
+
+ if (blk_rq_nr_phys_segments(req)) {
+ iod->sg_table.sgl = iod->first_sgl;
+ if (sg_alloc_table_chained(&iod->sg_table,
+ blk_rq_nr_phys_segments(req),
+ iod->sg_table.sgl))
+ return BLK_STS_RESOURCE;
+
+ iod->req.sg = iod->sg_table.sgl;
+ iod->req.sg_cnt = blk_rq_map_sg(req->q, req, iod->sg_table.sgl);
+ iod->req.transfer_len = blk_rq_payload_bytes(req);
+ }
+
+ schedule_work(&iod->work);
+ return BLK_STS_OK;
+}
+
+static void nvme_loop_submit_async_event(struct nvme_ctrl *arg)
+{
+ struct nvme_loop_ctrl *ctrl = to_loop_ctrl(arg);
+ struct nvme_loop_queue *queue = &ctrl->queues[0];
+ struct nvme_loop_iod *iod = &ctrl->async_event_iod;
+
+ memset(&iod->cmd, 0, sizeof(iod->cmd));
+ iod->cmd.common.opcode = nvme_admin_async_event;
+ iod->cmd.common.command_id = NVME_AQ_BLK_MQ_DEPTH;
+ iod->cmd.common.flags |= NVME_CMD_SGL_METABUF;
+
+ if (!nvmet_req_init(&iod->req, &queue->nvme_cq, &queue->nvme_sq,
+ &nvme_loop_ops)) {
+ dev_err(ctrl->ctrl.device, "failed async event work\n");
+ return;
+ }
+
+ schedule_work(&iod->work);
+}
+
+static int nvme_loop_init_iod(struct nvme_loop_ctrl *ctrl,
+ struct nvme_loop_iod *iod, unsigned int queue_idx)
+{
+ iod->req.cmd = &iod->cmd;
+ iod->req.rsp = &iod->rsp;
+ iod->queue = &ctrl->queues[queue_idx];
+ INIT_WORK(&iod->work, nvme_loop_execute_work);
+ return 0;
+}
+
+static int nvme_loop_init_request(struct blk_mq_tag_set *set,
+ struct request *req, unsigned int hctx_idx,
+ unsigned int numa_node)
+{
+ struct nvme_loop_ctrl *ctrl = set->driver_data;
+
+ nvme_req(req)->ctrl = &ctrl->ctrl;
+ return nvme_loop_init_iod(ctrl, blk_mq_rq_to_pdu(req),
+ (set == &ctrl->tag_set) ? hctx_idx + 1 : 0);
+}
+
+static int nvme_loop_init_hctx(struct blk_mq_hw_ctx *hctx, void *data,
+ unsigned int hctx_idx)
+{
+ struct nvme_loop_ctrl *ctrl = data;
+ struct nvme_loop_queue *queue = &ctrl->queues[hctx_idx + 1];
+
+ BUG_ON(hctx_idx >= ctrl->ctrl.queue_count);
+
+ hctx->driver_data = queue;
+ return 0;
+}
+
+static int nvme_loop_init_admin_hctx(struct blk_mq_hw_ctx *hctx, void *data,
+ unsigned int hctx_idx)
+{
+ struct nvme_loop_ctrl *ctrl = data;
+ struct nvme_loop_queue *queue = &ctrl->queues[0];
+
+ BUG_ON(hctx_idx != 0);
+
+ hctx->driver_data = queue;
+ return 0;
+}
+
+static const struct blk_mq_ops nvme_loop_mq_ops = {
+ .queue_rq = nvme_loop_queue_rq,
+ .complete = nvme_loop_complete_rq,
+ .init_request = nvme_loop_init_request,
+ .init_hctx = nvme_loop_init_hctx,
+ .timeout = nvme_loop_timeout,
+};
+
+static const struct blk_mq_ops nvme_loop_admin_mq_ops = {
+ .queue_rq = nvme_loop_queue_rq,
+ .complete = nvme_loop_complete_rq,
+ .init_request = nvme_loop_init_request,
+ .init_hctx = nvme_loop_init_admin_hctx,
+ .timeout = nvme_loop_timeout,
+};
+
+static void nvme_loop_destroy_admin_queue(struct nvme_loop_ctrl *ctrl)
+{
+ if (!test_and_clear_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[0].flags))
+ return;
+ nvmet_sq_destroy(&ctrl->queues[0].nvme_sq);
+ blk_cleanup_queue(ctrl->ctrl.admin_q);
+ blk_mq_free_tag_set(&ctrl->admin_tag_set);
+}
+
+static void nvme_loop_free_ctrl(struct nvme_ctrl *nctrl)
+{
+ struct nvme_loop_ctrl *ctrl = to_loop_ctrl(nctrl);
+
+ if (list_empty(&ctrl->list))
+ goto free_ctrl;
+
+ mutex_lock(&nvme_loop_ctrl_mutex);
+ list_del(&ctrl->list);
+ mutex_unlock(&nvme_loop_ctrl_mutex);
+
+ if (nctrl->tagset) {
+ blk_cleanup_queue(ctrl->ctrl.connect_q);
+ blk_mq_free_tag_set(&ctrl->tag_set);
+ }
+ kfree(ctrl->queues);
+ nvmf_free_options(nctrl->opts);
+free_ctrl:
+ kfree(ctrl);
+}
+
+static void nvme_loop_destroy_io_queues(struct nvme_loop_ctrl *ctrl)
+{
+ int i;
+
+ for (i = 1; i < ctrl->ctrl.queue_count; i++) {
+ clear_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[i].flags);
+ nvmet_sq_destroy(&ctrl->queues[i].nvme_sq);
+ }
+ ctrl->ctrl.queue_count = 1;
+}
+
+static int nvme_loop_init_io_queues(struct nvme_loop_ctrl *ctrl)
+{
+ struct nvmf_ctrl_options *opts = ctrl->ctrl.opts;
+ unsigned int nr_io_queues;
+ int ret, i;
+
+ nr_io_queues = min(opts->nr_io_queues, num_online_cpus());
+ ret = nvme_set_queue_count(&ctrl->ctrl, &nr_io_queues);
+ if (ret || !nr_io_queues)
+ return ret;
+
+ dev_info(ctrl->ctrl.device, "creating %d I/O queues.\n", nr_io_queues);
+
+ for (i = 1; i <= nr_io_queues; i++) {
+ ctrl->queues[i].ctrl = ctrl;
+ ret = nvmet_sq_init(&ctrl->queues[i].nvme_sq);
+ if (ret)
+ goto out_destroy_queues;
+
+ ctrl->ctrl.queue_count++;
+ }
+
+ return 0;
+
+out_destroy_queues:
+ nvme_loop_destroy_io_queues(ctrl);
+ return ret;
+}
+
+static int nvme_loop_connect_io_queues(struct nvme_loop_ctrl *ctrl)
+{
+ int i, ret;
+
+ for (i = 1; i < ctrl->ctrl.queue_count; i++) {
+ ret = nvmf_connect_io_queue(&ctrl->ctrl, i);
+ if (ret)
+ return ret;
+ set_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[i].flags);
+ }
+
+ return 0;
+}
+
+static int nvme_loop_configure_admin_queue(struct nvme_loop_ctrl *ctrl)
+{
+ int error;
+
+ memset(&ctrl->admin_tag_set, 0, sizeof(ctrl->admin_tag_set));
+ ctrl->admin_tag_set.ops = &nvme_loop_admin_mq_ops;
+ ctrl->admin_tag_set.queue_depth = NVME_AQ_MQ_TAG_DEPTH;
+ ctrl->admin_tag_set.reserved_tags = 2; /* connect + keep-alive */
+ ctrl->admin_tag_set.numa_node = NUMA_NO_NODE;
+ ctrl->admin_tag_set.cmd_size = sizeof(struct nvme_loop_iod) +
+ SG_CHUNK_SIZE * sizeof(struct scatterlist);
+ ctrl->admin_tag_set.driver_data = ctrl;
+ ctrl->admin_tag_set.nr_hw_queues = 1;
+ ctrl->admin_tag_set.timeout = ADMIN_TIMEOUT;
+ ctrl->admin_tag_set.flags = BLK_MQ_F_NO_SCHED;
+
+ ctrl->queues[0].ctrl = ctrl;
+ error = nvmet_sq_init(&ctrl->queues[0].nvme_sq);
+ if (error)
+ return error;
+ ctrl->ctrl.queue_count = 1;
+
+ error = blk_mq_alloc_tag_set(&ctrl->admin_tag_set);
+ if (error)
+ goto out_free_sq;
+ ctrl->ctrl.admin_tagset = &ctrl->admin_tag_set;
+
+ ctrl->ctrl.admin_q = blk_mq_init_queue(&ctrl->admin_tag_set);
+ if (IS_ERR(ctrl->ctrl.admin_q)) {
+ error = PTR_ERR(ctrl->ctrl.admin_q);
+ goto out_free_tagset;
+ }
+
+ error = nvmf_connect_admin_queue(&ctrl->ctrl);
+ if (error)
+ goto out_cleanup_queue;
+
+ set_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[0].flags);
+
+ error = nvmf_reg_read64(&ctrl->ctrl, NVME_REG_CAP, &ctrl->ctrl.cap);
+ if (error) {
+ dev_err(ctrl->ctrl.device,
+ "prop_get NVME_REG_CAP failed\n");
+ goto out_cleanup_queue;
+ }
+
+ ctrl->ctrl.sqsize =
+ min_t(int, NVME_CAP_MQES(ctrl->ctrl.cap), ctrl->ctrl.sqsize);
+
+ error = nvme_enable_ctrl(&ctrl->ctrl, ctrl->ctrl.cap);
+ if (error)
+ goto out_cleanup_queue;
+
+ ctrl->ctrl.max_hw_sectors =
+ (NVME_LOOP_MAX_SEGMENTS - 1) << (PAGE_SHIFT - 9);
+
+ error = nvme_init_identify(&ctrl->ctrl);
+ if (error)
+ goto out_cleanup_queue;
+
+ return 0;
+
+out_cleanup_queue:
+ clear_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[0].flags);
+ blk_cleanup_queue(ctrl->ctrl.admin_q);
+out_free_tagset:
+ blk_mq_free_tag_set(&ctrl->admin_tag_set);
+out_free_sq:
+ nvmet_sq_destroy(&ctrl->queues[0].nvme_sq);
+ return error;
+}
+
+static void nvme_loop_shutdown_ctrl(struct nvme_loop_ctrl *ctrl)
+{
+ if (ctrl->ctrl.queue_count > 1) {
+ nvme_stop_queues(&ctrl->ctrl);
+ blk_mq_tagset_busy_iter(&ctrl->tag_set,
+ nvme_cancel_request, &ctrl->ctrl);
+ nvme_loop_destroy_io_queues(ctrl);
+ }
+
+ if (ctrl->ctrl.state == NVME_CTRL_LIVE)
+ nvme_shutdown_ctrl(&ctrl->ctrl);
+
+ blk_mq_quiesce_queue(ctrl->ctrl.admin_q);
+ blk_mq_tagset_busy_iter(&ctrl->admin_tag_set,
+ nvme_cancel_request, &ctrl->ctrl);
+ blk_mq_unquiesce_queue(ctrl->ctrl.admin_q);
+ nvme_loop_destroy_admin_queue(ctrl);
+}
+
+static void nvme_loop_delete_ctrl_host(struct nvme_ctrl *ctrl)
+{
+ nvme_loop_shutdown_ctrl(to_loop_ctrl(ctrl));
+}
+
+static void nvme_loop_delete_ctrl(struct nvmet_ctrl *nctrl)
+{
+ struct nvme_loop_ctrl *ctrl;
+
+ mutex_lock(&nvme_loop_ctrl_mutex);
+ list_for_each_entry(ctrl, &nvme_loop_ctrl_list, list) {
+ if (ctrl->ctrl.cntlid == nctrl->cntlid)
+ nvme_delete_ctrl(&ctrl->ctrl);
+ }
+ mutex_unlock(&nvme_loop_ctrl_mutex);
+}
+
+static void nvme_loop_reset_ctrl_work(struct work_struct *work)
+{
+ struct nvme_loop_ctrl *ctrl =
+ container_of(work, struct nvme_loop_ctrl, ctrl.reset_work);
+ bool changed;
+ int ret;
+
+ nvme_stop_ctrl(&ctrl->ctrl);
+ nvme_loop_shutdown_ctrl(ctrl);
+
+ if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_CONNECTING)) {
+ /* state change failure should never happen */
+ WARN_ON_ONCE(1);
+ return;
+ }
+
+ ret = nvme_loop_configure_admin_queue(ctrl);
+ if (ret)
+ goto out_disable;
+
+ ret = nvme_loop_init_io_queues(ctrl);
+ if (ret)
+ goto out_destroy_admin;
+
+ ret = nvme_loop_connect_io_queues(ctrl);
+ if (ret)
+ goto out_destroy_io;
+
+ blk_mq_update_nr_hw_queues(&ctrl->tag_set,
+ ctrl->ctrl.queue_count - 1);
+
+ changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE);
+ WARN_ON_ONCE(!changed);
+
+ nvme_start_ctrl(&ctrl->ctrl);
+
+ return;
+
+out_destroy_io:
+ nvme_loop_destroy_io_queues(ctrl);
+out_destroy_admin:
+ nvme_loop_destroy_admin_queue(ctrl);
+out_disable:
+ dev_warn(ctrl->ctrl.device, "Removing after reset failure\n");
+ nvme_uninit_ctrl(&ctrl->ctrl);
+ nvme_put_ctrl(&ctrl->ctrl);
+}
+
+static const struct nvme_ctrl_ops nvme_loop_ctrl_ops = {
+ .name = "loop",
+ .module = THIS_MODULE,
+ .flags = NVME_F_FABRICS,
+ .reg_read32 = nvmf_reg_read32,
+ .reg_read64 = nvmf_reg_read64,
+ .reg_write32 = nvmf_reg_write32,
+ .free_ctrl = nvme_loop_free_ctrl,
+ .submit_async_event = nvme_loop_submit_async_event,
+ .delete_ctrl = nvme_loop_delete_ctrl_host,
+ .get_address = nvmf_get_address,
+};
+
+static int nvme_loop_create_io_queues(struct nvme_loop_ctrl *ctrl)
+{
+ int ret;
+
+ ret = nvme_loop_init_io_queues(ctrl);
+ if (ret)
+ return ret;
+
+ memset(&ctrl->tag_set, 0, sizeof(ctrl->tag_set));
+ ctrl->tag_set.ops = &nvme_loop_mq_ops;
+ ctrl->tag_set.queue_depth = ctrl->ctrl.opts->queue_size;
+ ctrl->tag_set.reserved_tags = 1; /* fabric connect */
+ ctrl->tag_set.numa_node = NUMA_NO_NODE;
+ ctrl->tag_set.flags = BLK_MQ_F_SHOULD_MERGE;
+ ctrl->tag_set.cmd_size = sizeof(struct nvme_loop_iod) +
+ SG_CHUNK_SIZE * sizeof(struct scatterlist);
+ ctrl->tag_set.driver_data = ctrl;
+ ctrl->tag_set.nr_hw_queues = ctrl->ctrl.queue_count - 1;
+ ctrl->tag_set.timeout = NVME_IO_TIMEOUT;
+ ctrl->ctrl.tagset = &ctrl->tag_set;
+
+ ret = blk_mq_alloc_tag_set(&ctrl->tag_set);
+ if (ret)
+ goto out_destroy_queues;
+
+ ctrl->ctrl.connect_q = blk_mq_init_queue(&ctrl->tag_set);
+ if (IS_ERR(ctrl->ctrl.connect_q)) {
+ ret = PTR_ERR(ctrl->ctrl.connect_q);
+ goto out_free_tagset;
+ }
+
+ ret = nvme_loop_connect_io_queues(ctrl);
+ if (ret)
+ goto out_cleanup_connect_q;
+
+ return 0;
+
+out_cleanup_connect_q:
+ blk_cleanup_queue(ctrl->ctrl.connect_q);
+out_free_tagset:
+ blk_mq_free_tag_set(&ctrl->tag_set);
+out_destroy_queues:
+ nvme_loop_destroy_io_queues(ctrl);
+ return ret;
+}
+
+static struct nvmet_port *nvme_loop_find_port(struct nvme_ctrl *ctrl)
+{
+ struct nvmet_port *p, *found = NULL;
+
+ mutex_lock(&nvme_loop_ports_mutex);
+ list_for_each_entry(p, &nvme_loop_ports, entry) {
+ /* if no transport address is specified use the first port */
+ if ((ctrl->opts->mask & NVMF_OPT_TRADDR) &&
+ strcmp(ctrl->opts->traddr, p->disc_addr.traddr))
+ continue;
+ found = p;
+ break;
+ }
+ mutex_unlock(&nvme_loop_ports_mutex);
+ return found;
+}
+
+static struct nvme_ctrl *nvme_loop_create_ctrl(struct device *dev,
+ struct nvmf_ctrl_options *opts)
+{
+ struct nvme_loop_ctrl *ctrl;
+ bool changed;
+ int ret;
+
+ ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
+ if (!ctrl)
+ return ERR_PTR(-ENOMEM);
+ ctrl->ctrl.opts = opts;
+ INIT_LIST_HEAD(&ctrl->list);
+
+ INIT_WORK(&ctrl->ctrl.reset_work, nvme_loop_reset_ctrl_work);
+
+ ret = nvme_init_ctrl(&ctrl->ctrl, dev, &nvme_loop_ctrl_ops,
+ 0 /* no quirks, we're perfect! */);
+ if (ret)
+ goto out_put_ctrl;
+
+ ret = -ENOMEM;
+
+ ctrl->ctrl.sqsize = opts->queue_size - 1;
+ ctrl->ctrl.kato = opts->kato;
+ ctrl->port = nvme_loop_find_port(&ctrl->ctrl);
+
+ ctrl->queues = kcalloc(opts->nr_io_queues + 1, sizeof(*ctrl->queues),
+ GFP_KERNEL);
+ if (!ctrl->queues)
+ goto out_uninit_ctrl;
+
+ ret = nvme_loop_configure_admin_queue(ctrl);
+ if (ret)
+ goto out_free_queues;
+
+ if (opts->queue_size > ctrl->ctrl.maxcmd) {
+ /* warn if maxcmd is lower than queue_size */
+ dev_warn(ctrl->ctrl.device,
+ "queue_size %zu > ctrl maxcmd %u, clamping down\n",
+ opts->queue_size, ctrl->ctrl.maxcmd);
+ opts->queue_size = ctrl->ctrl.maxcmd;
+ }
+
+ if (opts->nr_io_queues) {
+ ret = nvme_loop_create_io_queues(ctrl);
+ if (ret)
+ goto out_remove_admin_queue;
+ }
+
+ nvme_loop_init_iod(ctrl, &ctrl->async_event_iod, 0);
+
+ dev_info(ctrl->ctrl.device,
+ "new ctrl: \"%s\"\n", ctrl->ctrl.opts->subsysnqn);
+
+ nvme_get_ctrl(&ctrl->ctrl);
+
+ changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE);
+ WARN_ON_ONCE(!changed);
+
+ mutex_lock(&nvme_loop_ctrl_mutex);
+ list_add_tail(&ctrl->list, &nvme_loop_ctrl_list);
+ mutex_unlock(&nvme_loop_ctrl_mutex);
+
+ nvme_start_ctrl(&ctrl->ctrl);
+
+ return &ctrl->ctrl;
+
+out_remove_admin_queue:
+ nvme_loop_destroy_admin_queue(ctrl);
+out_free_queues:
+ kfree(ctrl->queues);
+out_uninit_ctrl:
+ nvme_uninit_ctrl(&ctrl->ctrl);
+out_put_ctrl:
+ nvme_put_ctrl(&ctrl->ctrl);
+ if (ret > 0)
+ ret = -EIO;
+ return ERR_PTR(ret);
+}
+
+static int nvme_loop_add_port(struct nvmet_port *port)
+{
+ mutex_lock(&nvme_loop_ports_mutex);
+ list_add_tail(&port->entry, &nvme_loop_ports);
+ mutex_unlock(&nvme_loop_ports_mutex);
+ return 0;
+}
+
+static void nvme_loop_remove_port(struct nvmet_port *port)
+{
+ mutex_lock(&nvme_loop_ports_mutex);
+ list_del_init(&port->entry);
+ mutex_unlock(&nvme_loop_ports_mutex);
+
+ /*
+ * Ensure any ctrls that are in the process of being
+ * deleted are in fact deleted before we return
+ * and free the port. This is to prevent active
+ * ctrls from using a port after it's freed.
+ */
+ flush_workqueue(nvme_delete_wq);
+}
+
+static const struct nvmet_fabrics_ops nvme_loop_ops = {
+ .owner = THIS_MODULE,
+ .type = NVMF_TRTYPE_LOOP,
+ .add_port = nvme_loop_add_port,
+ .remove_port = nvme_loop_remove_port,
+ .queue_response = nvme_loop_queue_response,
+ .delete_ctrl = nvme_loop_delete_ctrl,
+};
+
+static struct nvmf_transport_ops nvme_loop_transport = {
+ .name = "loop",
+ .module = THIS_MODULE,
+ .create_ctrl = nvme_loop_create_ctrl,
+ .allowed_opts = NVMF_OPT_TRADDR,
+};
+
+static int __init nvme_loop_init_module(void)
+{
+ int ret;
+
+ ret = nvmet_register_transport(&nvme_loop_ops);
+ if (ret)
+ return ret;
+
+ ret = nvmf_register_transport(&nvme_loop_transport);
+ if (ret)
+ nvmet_unregister_transport(&nvme_loop_ops);
+
+ return ret;
+}
+
+static void __exit nvme_loop_cleanup_module(void)
+{
+ struct nvme_loop_ctrl *ctrl, *next;
+
+ nvmf_unregister_transport(&nvme_loop_transport);
+ nvmet_unregister_transport(&nvme_loop_ops);
+
+ mutex_lock(&nvme_loop_ctrl_mutex);
+ list_for_each_entry_safe(ctrl, next, &nvme_loop_ctrl_list, list)
+ nvme_delete_ctrl(&ctrl->ctrl);
+ mutex_unlock(&nvme_loop_ctrl_mutex);
+
+ flush_workqueue(nvme_delete_wq);
+}
+
+module_init(nvme_loop_init_module);
+module_exit(nvme_loop_cleanup_module);
+
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("nvmet-transport-254"); /* 254 == NVMF_TRTYPE_LOOP */