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737 lines
19 KiB
737 lines
19 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* NVMe over Fabrics loopback device. |
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* Copyright (c) 2015-2016 HGST, a Western Digital Company. |
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*/ |
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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#include <linux/scatterlist.h> |
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#include <linux/blk-mq.h> |
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#include <linux/nvme.h> |
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#include <linux/module.h> |
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#include <linux/parser.h> |
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#include "nvmet.h" |
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#include "../host/nvme.h" |
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#include "../host/fabrics.h" |
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#define NVME_LOOP_MAX_SEGMENTS 256 |
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|
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struct nvme_loop_iod { |
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struct nvme_request nvme_req; |
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struct nvme_command cmd; |
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struct nvme_completion cqe; |
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struct nvmet_req req; |
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struct nvme_loop_queue *queue; |
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struct work_struct work; |
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struct sg_table sg_table; |
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struct scatterlist first_sgl[]; |
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}; |
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struct nvme_loop_ctrl { |
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struct nvme_loop_queue *queues; |
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struct blk_mq_tag_set admin_tag_set; |
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struct list_head list; |
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struct blk_mq_tag_set tag_set; |
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struct nvme_loop_iod async_event_iod; |
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struct nvme_ctrl ctrl; |
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struct nvmet_port *port; |
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}; |
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static inline struct nvme_loop_ctrl *to_loop_ctrl(struct nvme_ctrl *ctrl) |
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{ |
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return container_of(ctrl, struct nvme_loop_ctrl, ctrl); |
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} |
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enum nvme_loop_queue_flags { |
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NVME_LOOP_Q_LIVE = 0, |
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}; |
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struct nvme_loop_queue { |
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struct nvmet_cq nvme_cq; |
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struct nvmet_sq nvme_sq; |
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struct nvme_loop_ctrl *ctrl; |
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unsigned long flags; |
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}; |
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static LIST_HEAD(nvme_loop_ports); |
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static DEFINE_MUTEX(nvme_loop_ports_mutex); |
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static LIST_HEAD(nvme_loop_ctrl_list); |
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static DEFINE_MUTEX(nvme_loop_ctrl_mutex); |
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static void nvme_loop_queue_response(struct nvmet_req *nvme_req); |
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static void nvme_loop_delete_ctrl(struct nvmet_ctrl *ctrl); |
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static const struct nvmet_fabrics_ops nvme_loop_ops; |
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static inline int nvme_loop_queue_idx(struct nvme_loop_queue *queue) |
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{ |
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return queue - queue->ctrl->queues; |
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} |
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static void nvme_loop_complete_rq(struct request *req) |
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{ |
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struct nvme_loop_iod *iod = blk_mq_rq_to_pdu(req); |
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sg_free_table_chained(&iod->sg_table, NVME_INLINE_SG_CNT); |
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nvme_complete_rq(req); |
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} |
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static struct blk_mq_tags *nvme_loop_tagset(struct nvme_loop_queue *queue) |
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{ |
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u32 queue_idx = nvme_loop_queue_idx(queue); |
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if (queue_idx == 0) |
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return queue->ctrl->admin_tag_set.tags[queue_idx]; |
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return queue->ctrl->tag_set.tags[queue_idx - 1]; |
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} |
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static void nvme_loop_queue_response(struct nvmet_req *req) |
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{ |
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struct nvme_loop_queue *queue = |
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container_of(req->sq, struct nvme_loop_queue, nvme_sq); |
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struct nvme_completion *cqe = req->cqe; |
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/* |
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* AEN requests are special as they don't time out and can |
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* survive any kind of queue freeze and often don't respond to |
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* aborts. We don't even bother to allocate a struct request |
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* for them but rather special case them here. |
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*/ |
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if (unlikely(nvme_is_aen_req(nvme_loop_queue_idx(queue), |
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cqe->command_id))) { |
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nvme_complete_async_event(&queue->ctrl->ctrl, cqe->status, |
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&cqe->result); |
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} else { |
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struct request *rq; |
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rq = blk_mq_tag_to_rq(nvme_loop_tagset(queue), cqe->command_id); |
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if (!rq) { |
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dev_err(queue->ctrl->ctrl.device, |
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"tag 0x%x on queue %d not found\n", |
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cqe->command_id, nvme_loop_queue_idx(queue)); |
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return; |
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} |
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if (!nvme_try_complete_req(rq, cqe->status, cqe->result)) |
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nvme_loop_complete_rq(rq); |
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} |
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} |
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static void nvme_loop_execute_work(struct work_struct *work) |
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{ |
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struct nvme_loop_iod *iod = |
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container_of(work, struct nvme_loop_iod, work); |
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iod->req.execute(&iod->req); |
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} |
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static blk_status_t nvme_loop_queue_rq(struct blk_mq_hw_ctx *hctx, |
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const struct blk_mq_queue_data *bd) |
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{ |
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struct nvme_ns *ns = hctx->queue->queuedata; |
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struct nvme_loop_queue *queue = hctx->driver_data; |
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struct request *req = bd->rq; |
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struct nvme_loop_iod *iod = blk_mq_rq_to_pdu(req); |
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bool queue_ready = test_bit(NVME_LOOP_Q_LIVE, &queue->flags); |
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blk_status_t ret; |
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if (!nvme_check_ready(&queue->ctrl->ctrl, req, queue_ready)) |
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return nvme_fail_nonready_command(&queue->ctrl->ctrl, req); |
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ret = nvme_setup_cmd(ns, req); |
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if (ret) |
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return ret; |
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blk_mq_start_request(req); |
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iod->cmd.common.flags |= NVME_CMD_SGL_METABUF; |
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iod->req.port = queue->ctrl->port; |
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if (!nvmet_req_init(&iod->req, &queue->nvme_cq, |
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&queue->nvme_sq, &nvme_loop_ops)) |
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return BLK_STS_OK; |
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if (blk_rq_nr_phys_segments(req)) { |
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iod->sg_table.sgl = iod->first_sgl; |
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if (sg_alloc_table_chained(&iod->sg_table, |
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blk_rq_nr_phys_segments(req), |
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iod->sg_table.sgl, NVME_INLINE_SG_CNT)) { |
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nvme_cleanup_cmd(req); |
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return BLK_STS_RESOURCE; |
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} |
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iod->req.sg = iod->sg_table.sgl; |
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iod->req.sg_cnt = blk_rq_map_sg(req->q, req, iod->sg_table.sgl); |
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iod->req.transfer_len = blk_rq_payload_bytes(req); |
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} |
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schedule_work(&iod->work); |
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return BLK_STS_OK; |
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} |
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static void nvme_loop_submit_async_event(struct nvme_ctrl *arg) |
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{ |
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struct nvme_loop_ctrl *ctrl = to_loop_ctrl(arg); |
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struct nvme_loop_queue *queue = &ctrl->queues[0]; |
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struct nvme_loop_iod *iod = &ctrl->async_event_iod; |
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memset(&iod->cmd, 0, sizeof(iod->cmd)); |
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iod->cmd.common.opcode = nvme_admin_async_event; |
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iod->cmd.common.command_id = NVME_AQ_BLK_MQ_DEPTH; |
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iod->cmd.common.flags |= NVME_CMD_SGL_METABUF; |
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if (!nvmet_req_init(&iod->req, &queue->nvme_cq, &queue->nvme_sq, |
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&nvme_loop_ops)) { |
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dev_err(ctrl->ctrl.device, "failed async event work\n"); |
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return; |
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} |
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schedule_work(&iod->work); |
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} |
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static int nvme_loop_init_iod(struct nvme_loop_ctrl *ctrl, |
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struct nvme_loop_iod *iod, unsigned int queue_idx) |
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{ |
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iod->req.cmd = &iod->cmd; |
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iod->req.cqe = &iod->cqe; |
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iod->queue = &ctrl->queues[queue_idx]; |
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INIT_WORK(&iod->work, nvme_loop_execute_work); |
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return 0; |
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} |
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static int nvme_loop_init_request(struct blk_mq_tag_set *set, |
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struct request *req, unsigned int hctx_idx, |
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unsigned int numa_node) |
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{ |
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struct nvme_loop_ctrl *ctrl = set->driver_data; |
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struct nvme_loop_iod *iod = blk_mq_rq_to_pdu(req); |
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nvme_req(req)->ctrl = &ctrl->ctrl; |
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nvme_req(req)->cmd = &iod->cmd; |
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return nvme_loop_init_iod(ctrl, blk_mq_rq_to_pdu(req), |
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(set == &ctrl->tag_set) ? hctx_idx + 1 : 0); |
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} |
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static struct lock_class_key loop_hctx_fq_lock_key; |
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static int nvme_loop_init_hctx(struct blk_mq_hw_ctx *hctx, void *data, |
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unsigned int hctx_idx) |
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{ |
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struct nvme_loop_ctrl *ctrl = data; |
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struct nvme_loop_queue *queue = &ctrl->queues[hctx_idx + 1]; |
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BUG_ON(hctx_idx >= ctrl->ctrl.queue_count); |
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/* |
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* flush_end_io() can be called recursively for us, so use our own |
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* lock class key for avoiding lockdep possible recursive locking, |
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* then we can remove the dynamically allocated lock class for each |
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* flush queue, that way may cause horrible boot delay. |
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*/ |
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blk_mq_hctx_set_fq_lock_class(hctx, &loop_hctx_fq_lock_key); |
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hctx->driver_data = queue; |
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return 0; |
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} |
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static int nvme_loop_init_admin_hctx(struct blk_mq_hw_ctx *hctx, void *data, |
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unsigned int hctx_idx) |
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{ |
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struct nvme_loop_ctrl *ctrl = data; |
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struct nvme_loop_queue *queue = &ctrl->queues[0]; |
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BUG_ON(hctx_idx != 0); |
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hctx->driver_data = queue; |
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return 0; |
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} |
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static const struct blk_mq_ops nvme_loop_mq_ops = { |
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.queue_rq = nvme_loop_queue_rq, |
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.complete = nvme_loop_complete_rq, |
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.init_request = nvme_loop_init_request, |
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.init_hctx = nvme_loop_init_hctx, |
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}; |
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static const struct blk_mq_ops nvme_loop_admin_mq_ops = { |
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.queue_rq = nvme_loop_queue_rq, |
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.complete = nvme_loop_complete_rq, |
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.init_request = nvme_loop_init_request, |
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.init_hctx = nvme_loop_init_admin_hctx, |
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}; |
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static void nvme_loop_destroy_admin_queue(struct nvme_loop_ctrl *ctrl) |
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{ |
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if (!test_and_clear_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[0].flags)) |
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return; |
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nvmet_sq_destroy(&ctrl->queues[0].nvme_sq); |
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blk_cleanup_queue(ctrl->ctrl.admin_q); |
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blk_cleanup_queue(ctrl->ctrl.fabrics_q); |
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blk_mq_free_tag_set(&ctrl->admin_tag_set); |
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} |
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static void nvme_loop_free_ctrl(struct nvme_ctrl *nctrl) |
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{ |
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struct nvme_loop_ctrl *ctrl = to_loop_ctrl(nctrl); |
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if (list_empty(&ctrl->list)) |
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goto free_ctrl; |
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mutex_lock(&nvme_loop_ctrl_mutex); |
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list_del(&ctrl->list); |
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mutex_unlock(&nvme_loop_ctrl_mutex); |
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if (nctrl->tagset) { |
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blk_cleanup_queue(ctrl->ctrl.connect_q); |
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blk_mq_free_tag_set(&ctrl->tag_set); |
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} |
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kfree(ctrl->queues); |
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nvmf_free_options(nctrl->opts); |
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free_ctrl: |
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kfree(ctrl); |
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} |
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static void nvme_loop_destroy_io_queues(struct nvme_loop_ctrl *ctrl) |
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{ |
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int i; |
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for (i = 1; i < ctrl->ctrl.queue_count; i++) { |
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clear_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[i].flags); |
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nvmet_sq_destroy(&ctrl->queues[i].nvme_sq); |
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} |
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ctrl->ctrl.queue_count = 1; |
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} |
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static int nvme_loop_init_io_queues(struct nvme_loop_ctrl *ctrl) |
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{ |
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struct nvmf_ctrl_options *opts = ctrl->ctrl.opts; |
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unsigned int nr_io_queues; |
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int ret, i; |
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nr_io_queues = min(opts->nr_io_queues, num_online_cpus()); |
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ret = nvme_set_queue_count(&ctrl->ctrl, &nr_io_queues); |
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if (ret || !nr_io_queues) |
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return ret; |
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dev_info(ctrl->ctrl.device, "creating %d I/O queues.\n", nr_io_queues); |
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for (i = 1; i <= nr_io_queues; i++) { |
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ctrl->queues[i].ctrl = ctrl; |
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ret = nvmet_sq_init(&ctrl->queues[i].nvme_sq); |
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if (ret) |
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goto out_destroy_queues; |
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ctrl->ctrl.queue_count++; |
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} |
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return 0; |
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out_destroy_queues: |
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nvme_loop_destroy_io_queues(ctrl); |
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return ret; |
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} |
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static int nvme_loop_connect_io_queues(struct nvme_loop_ctrl *ctrl) |
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{ |
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int i, ret; |
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for (i = 1; i < ctrl->ctrl.queue_count; i++) { |
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ret = nvmf_connect_io_queue(&ctrl->ctrl, i, false); |
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if (ret) |
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return ret; |
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set_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[i].flags); |
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} |
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return 0; |
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} |
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static int nvme_loop_configure_admin_queue(struct nvme_loop_ctrl *ctrl) |
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{ |
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int error; |
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memset(&ctrl->admin_tag_set, 0, sizeof(ctrl->admin_tag_set)); |
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ctrl->admin_tag_set.ops = &nvme_loop_admin_mq_ops; |
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ctrl->admin_tag_set.queue_depth = NVME_AQ_MQ_TAG_DEPTH; |
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ctrl->admin_tag_set.reserved_tags = NVMF_RESERVED_TAGS; |
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ctrl->admin_tag_set.numa_node = ctrl->ctrl.numa_node; |
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ctrl->admin_tag_set.cmd_size = sizeof(struct nvme_loop_iod) + |
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NVME_INLINE_SG_CNT * sizeof(struct scatterlist); |
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ctrl->admin_tag_set.driver_data = ctrl; |
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ctrl->admin_tag_set.nr_hw_queues = 1; |
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ctrl->admin_tag_set.timeout = NVME_ADMIN_TIMEOUT; |
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ctrl->admin_tag_set.flags = BLK_MQ_F_NO_SCHED; |
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ctrl->queues[0].ctrl = ctrl; |
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error = nvmet_sq_init(&ctrl->queues[0].nvme_sq); |
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if (error) |
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return error; |
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ctrl->ctrl.queue_count = 1; |
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error = blk_mq_alloc_tag_set(&ctrl->admin_tag_set); |
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if (error) |
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goto out_free_sq; |
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ctrl->ctrl.admin_tagset = &ctrl->admin_tag_set; |
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ctrl->ctrl.fabrics_q = blk_mq_init_queue(&ctrl->admin_tag_set); |
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if (IS_ERR(ctrl->ctrl.fabrics_q)) { |
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error = PTR_ERR(ctrl->ctrl.fabrics_q); |
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goto out_free_tagset; |
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} |
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ctrl->ctrl.admin_q = blk_mq_init_queue(&ctrl->admin_tag_set); |
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if (IS_ERR(ctrl->ctrl.admin_q)) { |
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error = PTR_ERR(ctrl->ctrl.admin_q); |
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goto out_cleanup_fabrics_q; |
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} |
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error = nvmf_connect_admin_queue(&ctrl->ctrl); |
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if (error) |
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goto out_cleanup_queue; |
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set_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[0].flags); |
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error = nvme_enable_ctrl(&ctrl->ctrl); |
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if (error) |
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goto out_cleanup_queue; |
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ctrl->ctrl.max_hw_sectors = |
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(NVME_LOOP_MAX_SEGMENTS - 1) << (PAGE_SHIFT - 9); |
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blk_mq_unquiesce_queue(ctrl->ctrl.admin_q); |
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error = nvme_init_ctrl_finish(&ctrl->ctrl); |
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if (error) |
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goto out_cleanup_queue; |
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return 0; |
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out_cleanup_queue: |
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clear_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[0].flags); |
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blk_cleanup_queue(ctrl->ctrl.admin_q); |
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out_cleanup_fabrics_q: |
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blk_cleanup_queue(ctrl->ctrl.fabrics_q); |
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out_free_tagset: |
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blk_mq_free_tag_set(&ctrl->admin_tag_set); |
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out_free_sq: |
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nvmet_sq_destroy(&ctrl->queues[0].nvme_sq); |
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return error; |
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} |
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static void nvme_loop_shutdown_ctrl(struct nvme_loop_ctrl *ctrl) |
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{ |
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if (ctrl->ctrl.queue_count > 1) { |
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nvme_stop_queues(&ctrl->ctrl); |
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blk_mq_tagset_busy_iter(&ctrl->tag_set, |
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nvme_cancel_request, &ctrl->ctrl); |
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blk_mq_tagset_wait_completed_request(&ctrl->tag_set); |
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nvme_loop_destroy_io_queues(ctrl); |
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} |
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blk_mq_quiesce_queue(ctrl->ctrl.admin_q); |
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if (ctrl->ctrl.state == NVME_CTRL_LIVE) |
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nvme_shutdown_ctrl(&ctrl->ctrl); |
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blk_mq_tagset_busy_iter(&ctrl->admin_tag_set, |
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nvme_cancel_request, &ctrl->ctrl); |
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blk_mq_tagset_wait_completed_request(&ctrl->admin_tag_set); |
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nvme_loop_destroy_admin_queue(ctrl); |
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} |
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static void nvme_loop_delete_ctrl_host(struct nvme_ctrl *ctrl) |
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{ |
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nvme_loop_shutdown_ctrl(to_loop_ctrl(ctrl)); |
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} |
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static void nvme_loop_delete_ctrl(struct nvmet_ctrl *nctrl) |
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{ |
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struct nvme_loop_ctrl *ctrl; |
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mutex_lock(&nvme_loop_ctrl_mutex); |
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list_for_each_entry(ctrl, &nvme_loop_ctrl_list, list) { |
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if (ctrl->ctrl.cntlid == nctrl->cntlid) |
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nvme_delete_ctrl(&ctrl->ctrl); |
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} |
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mutex_unlock(&nvme_loop_ctrl_mutex); |
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} |
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static void nvme_loop_reset_ctrl_work(struct work_struct *work) |
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{ |
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struct nvme_loop_ctrl *ctrl = |
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container_of(work, struct nvme_loop_ctrl, ctrl.reset_work); |
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int ret; |
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nvme_stop_ctrl(&ctrl->ctrl); |
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nvme_loop_shutdown_ctrl(ctrl); |
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if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_CONNECTING)) { |
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if (ctrl->ctrl.state != NVME_CTRL_DELETING && |
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ctrl->ctrl.state != NVME_CTRL_DELETING_NOIO) |
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/* state change failure for non-deleted ctrl? */ |
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WARN_ON_ONCE(1); |
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return; |
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} |
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ret = nvme_loop_configure_admin_queue(ctrl); |
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if (ret) |
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goto out_disable; |
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ret = nvme_loop_init_io_queues(ctrl); |
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if (ret) |
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goto out_destroy_admin; |
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ret = nvme_loop_connect_io_queues(ctrl); |
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if (ret) |
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goto out_destroy_io; |
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blk_mq_update_nr_hw_queues(&ctrl->tag_set, |
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ctrl->ctrl.queue_count - 1); |
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if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE)) |
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WARN_ON_ONCE(1); |
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nvme_start_ctrl(&ctrl->ctrl); |
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return; |
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out_destroy_io: |
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nvme_loop_destroy_io_queues(ctrl); |
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out_destroy_admin: |
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nvme_loop_destroy_admin_queue(ctrl); |
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out_disable: |
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dev_warn(ctrl->ctrl.device, "Removing after reset failure\n"); |
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nvme_uninit_ctrl(&ctrl->ctrl); |
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} |
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static const struct nvme_ctrl_ops nvme_loop_ctrl_ops = { |
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.name = "loop", |
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.module = THIS_MODULE, |
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.flags = NVME_F_FABRICS, |
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.reg_read32 = nvmf_reg_read32, |
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.reg_read64 = nvmf_reg_read64, |
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.reg_write32 = nvmf_reg_write32, |
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.free_ctrl = nvme_loop_free_ctrl, |
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.submit_async_event = nvme_loop_submit_async_event, |
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.delete_ctrl = nvme_loop_delete_ctrl_host, |
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.get_address = nvmf_get_address, |
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}; |
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|
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static int nvme_loop_create_io_queues(struct nvme_loop_ctrl *ctrl) |
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{ |
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int ret; |
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|
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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 = NVMF_RESERVED_TAGS; |
|
ctrl->tag_set.numa_node = ctrl->ctrl.numa_node; |
|
ctrl->tag_set.flags = BLK_MQ_F_SHOULD_MERGE; |
|
ctrl->tag_set.cmd_size = sizeof(struct nvme_loop_iod) + |
|
NVME_INLINE_SG_CNT * 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; |
|
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) { |
|
kfree(ctrl); |
|
goto out; |
|
} |
|
|
|
if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_CONNECTING)) |
|
WARN_ON_ONCE(1); |
|
|
|
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); |
|
|
|
if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE)) |
|
WARN_ON_ONCE(1); |
|
|
|
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); |
|
nvme_put_ctrl(&ctrl->ctrl); |
|
out: |
|
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 */
|
|
|