forked from Minki/linux
nvme-loop: add a NVMe loopback host driver
This patch implements adds nvme-loop which allows to access local devices exported as NVMe over Fabrics namespaces. This module can be useful for easy evaluation, testing and also feature experimentation. To createa nvme-loop device you need to configure the NVMe target to export a loop port (see the nvmetcli documentaton for that) and then connect to it using nvme connect-all -t loop which requires the very latest nvme-cli version with Fabrics support. Signed-off-by: Jay Freyensee <james.p.freyensee@intel.com> Signed-off-by: Ming Lin <ming.l@ssi.samsung.com> Signed-off-by: Sagi Grimberg <sagi@grimberg.me> Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Steve Wise <swise@opengridcomputing.com> Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Christoph Hellwig
Jens Axboe
parent
a07b4970f4
commit
3a85a5de29
@ -13,4 +13,14 @@ config NVME_TARGET
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To configure the NVMe target you probably want to use the nvmetcli
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tool from http://git.infradead.org/users/hch/nvmetcli.git.
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config NVME_TARGET_LOOP
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tristate "NVMe loopback device support"
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depends on BLK_DEV_NVME
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select NVME_TARGET
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select NVME_FABRICS
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select SG_POOL
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help
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This enables the NVMe loopback device support, which can be useful
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to test NVMe host and target side features.
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If unsure, say N.
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@ -1,5 +1,7 @@
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obj-$(CONFIG_NVME_TARGET) += nvmet.o
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obj-$(CONFIG_NVME_TARGET_LOOP) += nvme-loop.o
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nvmet-y += core.o configfs.o admin-cmd.o io-cmd.o fabrics-cmd.o \
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discovery.o
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nvme-loop-y += loop.o
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754
drivers/nvme/target/loop.c
Normal file
754
drivers/nvme/target/loop.c
Normal file
@ -0,0 +1,754 @@
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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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* 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/scatterlist.h>
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#include <linux/delay.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 <linux/t10-pi.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_AQ_DEPTH 256
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#define NVME_LOOP_MAX_SEGMENTS 256
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/*
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* We handle AEN commands ourselves and don't even let the
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* block layer know about them.
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*/
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#define NVME_LOOP_NR_AEN_COMMANDS 1
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#define NVME_LOOP_AQ_BLKMQ_DEPTH \
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(NVME_LOOP_AQ_DEPTH - NVME_LOOP_NR_AEN_COMMANDS)
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struct nvme_loop_iod {
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struct nvme_command cmd;
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struct nvme_completion rsp;
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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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spinlock_t lock;
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struct nvme_loop_queue *queues;
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u32 queue_count;
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struct blk_mq_tag_set admin_tag_set;
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struct list_head list;
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u64 cap;
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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_ctrl *target_ctrl;
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struct work_struct delete_work;
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struct work_struct reset_work;
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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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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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};
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static struct nvmet_port *nvmet_loop_port;
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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 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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int error = 0;
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nvme_cleanup_cmd(req);
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sg_free_table_chained(&iod->sg_table, true);
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if (unlikely(req->errors)) {
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if (nvme_req_needs_retry(req, req->errors)) {
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nvme_requeue_req(req);
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return;
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}
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if (req->cmd_type == REQ_TYPE_DRV_PRIV)
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error = req->errors;
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else
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error = nvme_error_status(req->errors);
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}
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blk_mq_end_request(req, error);
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}
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static void nvme_loop_queue_response(struct nvmet_req *nvme_req)
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{
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struct nvme_loop_iod *iod =
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container_of(nvme_req, struct nvme_loop_iod, req);
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struct nvme_completion *cqe = &iod->rsp;
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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_loop_queue_idx(iod->queue) == 0 &&
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cqe->command_id >= NVME_LOOP_AQ_BLKMQ_DEPTH)) {
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nvme_complete_async_event(&iod->queue->ctrl->ctrl, cqe);
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} else {
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struct request *req = blk_mq_rq_from_pdu(iod);
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if (req->cmd_type == REQ_TYPE_DRV_PRIV && req->special)
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memcpy(req->special, cqe, sizeof(*cqe));
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blk_mq_complete_request(req, le16_to_cpu(cqe->status) >> 1);
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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 enum blk_eh_timer_return
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nvme_loop_timeout(struct request *rq, bool reserved)
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{
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struct nvme_loop_iod *iod = blk_mq_rq_to_pdu(rq);
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/* queue error recovery */
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schedule_work(&iod->queue->ctrl->reset_work);
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/* fail with DNR on admin cmd timeout */
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rq->errors = NVME_SC_ABORT_REQ | NVME_SC_DNR;
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return BLK_EH_HANDLED;
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}
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static int 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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int ret;
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ret = nvme_setup_cmd(ns, req, &iod->cmd);
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if (ret)
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return ret;
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iod->cmd.common.flags |= NVME_CMD_SGL_METABUF;
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iod->req.port = nvmet_loop_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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nvme_cleanup_cmd(req);
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blk_mq_start_request(req);
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nvme_loop_queue_response(&iod->req);
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return 0;
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}
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if (blk_rq_bytes(req)) {
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iod->sg_table.sgl = iod->first_sgl;
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ret = sg_alloc_table_chained(&iod->sg_table,
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req->nr_phys_segments, iod->sg_table.sgl);
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if (ret)
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return BLK_MQ_RQ_QUEUE_BUSY;
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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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BUG_ON(iod->req.sg_cnt > req->nr_phys_segments);
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}
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iod->cmd.common.command_id = req->tag;
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blk_mq_start_request(req);
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schedule_work(&iod->work);
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return 0;
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}
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static void nvme_loop_submit_async_event(struct nvme_ctrl *arg, int aer_idx)
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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_LOOP_AQ_BLKMQ_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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BUG_ON(queue_idx >= ctrl->queue_count);
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iod->req.cmd = &iod->cmd;
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iod->req.rsp = &iod->rsp;
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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(void *data, struct request *req,
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unsigned int hctx_idx, unsigned int rq_idx,
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unsigned int numa_node)
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{
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return nvme_loop_init_iod(data, blk_mq_rq_to_pdu(req), hctx_idx + 1);
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}
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static int nvme_loop_init_admin_request(void *data, struct request *req,
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unsigned int hctx_idx, unsigned int rq_idx,
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unsigned int numa_node)
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{
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return nvme_loop_init_iod(data, blk_mq_rq_to_pdu(req), 0);
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}
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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->queue_count);
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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 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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.map_queue = blk_mq_map_queue,
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.init_request = nvme_loop_init_request,
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.init_hctx = nvme_loop_init_hctx,
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.timeout = nvme_loop_timeout,
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};
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static 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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.map_queue = blk_mq_map_queue,
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.init_request = nvme_loop_init_admin_request,
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.init_hctx = nvme_loop_init_admin_hctx,
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.timeout = nvme_loop_timeout,
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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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blk_cleanup_queue(ctrl->ctrl.admin_q);
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blk_mq_free_tag_set(&ctrl->admin_tag_set);
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nvmet_sq_destroy(&ctrl->queues[0].nvme_sq);
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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 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_LOOP_AQ_BLKMQ_DEPTH;
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ctrl->admin_tag_set.reserved_tags = 2; /* connect + keep-alive */
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ctrl->admin_tag_set.numa_node = NUMA_NO_NODE;
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ctrl->admin_tag_set.cmd_size = sizeof(struct nvme_loop_iod) +
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SG_CHUNK_SIZE * 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 = ADMIN_TIMEOUT;
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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->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_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_free_tagset;
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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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error = nvmf_reg_read64(&ctrl->ctrl, NVME_REG_CAP, &ctrl->cap);
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if (error) {
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dev_err(ctrl->ctrl.device,
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"prop_get NVME_REG_CAP failed\n");
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goto out_cleanup_queue;
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}
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ctrl->ctrl.sqsize =
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min_t(int, NVME_CAP_MQES(ctrl->cap) + 1, ctrl->ctrl.sqsize);
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error = nvme_enable_ctrl(&ctrl->ctrl, ctrl->cap);
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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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error = nvme_init_identify(&ctrl->ctrl);
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if (error)
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goto out_cleanup_queue;
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nvme_start_keep_alive(&ctrl->ctrl);
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return 0;
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out_cleanup_queue:
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blk_cleanup_queue(ctrl->ctrl.admin_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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int i;
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nvme_stop_keep_alive(&ctrl->ctrl);
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if (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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for (i = 1; i < ctrl->queue_count; i++)
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nvmet_sq_destroy(&ctrl->queues[i].nvme_sq);
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}
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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_stop_hw_queues(ctrl->ctrl.admin_q);
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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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nvme_loop_destroy_admin_queue(ctrl);
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}
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static void nvme_loop_del_ctrl_work(struct work_struct *work)
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{
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struct nvme_loop_ctrl *ctrl = container_of(work,
|
||||
struct nvme_loop_ctrl, delete_work);
|
||||
|
||||
nvme_remove_namespaces(&ctrl->ctrl);
|
||||
nvme_loop_shutdown_ctrl(ctrl);
|
||||
nvme_uninit_ctrl(&ctrl->ctrl);
|
||||
nvme_put_ctrl(&ctrl->ctrl);
|
||||
}
|
||||
|
||||
static int __nvme_loop_del_ctrl(struct nvme_loop_ctrl *ctrl)
|
||||
{
|
||||
if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_DELETING))
|
||||
return -EBUSY;
|
||||
|
||||
if (!schedule_work(&ctrl->delete_work))
|
||||
return -EBUSY;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int nvme_loop_del_ctrl(struct nvme_ctrl *nctrl)
|
||||
{
|
||||
struct nvme_loop_ctrl *ctrl = to_loop_ctrl(nctrl);
|
||||
int ret;
|
||||
|
||||
ret = __nvme_loop_del_ctrl(ctrl);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
flush_work(&ctrl->delete_work);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
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_loop_del_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, reset_work);
|
||||
bool changed;
|
||||
int i, ret;
|
||||
|
||||
nvme_loop_shutdown_ctrl(ctrl);
|
||||
|
||||
ret = nvme_loop_configure_admin_queue(ctrl);
|
||||
if (ret)
|
||||
goto out_disable;
|
||||
|
||||
for (i = 1; i <= ctrl->ctrl.opts->nr_io_queues; i++) {
|
||||
ctrl->queues[i].ctrl = ctrl;
|
||||
ret = nvmet_sq_init(&ctrl->queues[i].nvme_sq);
|
||||
if (ret)
|
||||
goto out_free_queues;
|
||||
|
||||
ctrl->queue_count++;
|
||||
}
|
||||
|
||||
for (i = 1; i <= ctrl->ctrl.opts->nr_io_queues; i++) {
|
||||
ret = nvmf_connect_io_queue(&ctrl->ctrl, i);
|
||||
if (ret)
|
||||
goto out_free_queues;
|
||||
}
|
||||
|
||||
changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE);
|
||||
WARN_ON_ONCE(!changed);
|
||||
|
||||
nvme_queue_scan(&ctrl->ctrl);
|
||||
nvme_queue_async_events(&ctrl->ctrl);
|
||||
|
||||
nvme_start_queues(&ctrl->ctrl);
|
||||
|
||||
return;
|
||||
|
||||
out_free_queues:
|
||||
for (i = 1; i < ctrl->queue_count; i++)
|
||||
nvmet_sq_destroy(&ctrl->queues[i].nvme_sq);
|
||||
nvme_loop_destroy_admin_queue(ctrl);
|
||||
out_disable:
|
||||
dev_warn(ctrl->ctrl.device, "Removing after reset failure\n");
|
||||
nvme_remove_namespaces(&ctrl->ctrl);
|
||||
nvme_uninit_ctrl(&ctrl->ctrl);
|
||||
nvme_put_ctrl(&ctrl->ctrl);
|
||||
}
|
||||
|
||||
static int nvme_loop_reset_ctrl(struct nvme_ctrl *nctrl)
|
||||
{
|
||||
struct nvme_loop_ctrl *ctrl = to_loop_ctrl(nctrl);
|
||||
|
||||
if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_RESETTING))
|
||||
return -EBUSY;
|
||||
|
||||
if (!schedule_work(&ctrl->reset_work))
|
||||
return -EBUSY;
|
||||
|
||||
flush_work(&ctrl->reset_work);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct nvme_ctrl_ops nvme_loop_ctrl_ops = {
|
||||
.name = "loop",
|
||||
.module = THIS_MODULE,
|
||||
.is_fabrics = true,
|
||||
.reg_read32 = nvmf_reg_read32,
|
||||
.reg_read64 = nvmf_reg_read64,
|
||||
.reg_write32 = nvmf_reg_write32,
|
||||
.reset_ctrl = nvme_loop_reset_ctrl,
|
||||
.free_ctrl = nvme_loop_free_ctrl,
|
||||
.submit_async_event = nvme_loop_submit_async_event,
|
||||
.delete_ctrl = nvme_loop_del_ctrl,
|
||||
.get_subsysnqn = nvmf_get_subsysnqn,
|
||||
};
|
||||
|
||||
static int nvme_loop_create_io_queues(struct nvme_loop_ctrl *ctrl)
|
||||
{
|
||||
struct nvmf_ctrl_options *opts = ctrl->ctrl.opts;
|
||||
int ret, i;
|
||||
|
||||
ret = nvme_set_queue_count(&ctrl->ctrl, &opts->nr_io_queues);
|
||||
if (ret || !opts->nr_io_queues)
|
||||
return ret;
|
||||
|
||||
dev_info(ctrl->ctrl.device, "creating %d I/O queues.\n",
|
||||
opts->nr_io_queues);
|
||||
|
||||
for (i = 1; i <= opts->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->queue_count++;
|
||||
}
|
||||
|
||||
memset(&ctrl->tag_set, 0, sizeof(ctrl->tag_set));
|
||||
ctrl->tag_set.ops = &nvme_loop_mq_ops;
|
||||
ctrl->tag_set.queue_depth = ctrl->ctrl.sqsize;
|
||||
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->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;
|
||||
}
|
||||
|
||||
for (i = 1; i <= opts->nr_io_queues; i++) {
|
||||
ret = nvmf_connect_io_queue(&ctrl->ctrl, i);
|
||||
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:
|
||||
for (i = 1; i < ctrl->queue_count; i++)
|
||||
nvmet_sq_destroy(&ctrl->queues[i].nvme_sq);
|
||||
return ret;
|
||||
}
|
||||
|
||||
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->delete_work, nvme_loop_del_ctrl_work);
|
||||
INIT_WORK(&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;
|
||||
|
||||
spin_lock_init(&ctrl->lock);
|
||||
|
||||
ret = -ENOMEM;
|
||||
|
||||
ctrl->ctrl.sqsize = opts->queue_size;
|
||||
ctrl->ctrl.kato = opts->kato;
|
||||
|
||||
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);
|
||||
|
||||
kref_get(&ctrl->ctrl.kref);
|
||||
|
||||
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);
|
||||
|
||||
if (opts->nr_io_queues) {
|
||||
nvme_queue_scan(&ctrl->ctrl);
|
||||
nvme_queue_async_events(&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)
|
||||
{
|
||||
/*
|
||||
* XXX: disalow adding more than one port so
|
||||
* there is no connection rejections when a
|
||||
* a subsystem is assigned to a port for which
|
||||
* loop doesn't have a pointer.
|
||||
* This scenario would be possible if we allowed
|
||||
* more than one port to be added and a subsystem
|
||||
* was assigned to a port other than nvmet_loop_port.
|
||||
*/
|
||||
|
||||
if (nvmet_loop_port)
|
||||
return -EPERM;
|
||||
|
||||
nvmet_loop_port = port;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void nvme_loop_remove_port(struct nvmet_port *port)
|
||||
{
|
||||
if (port == nvmet_loop_port)
|
||||
nvmet_loop_port = NULL;
|
||||
}
|
||||
|
||||
static 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",
|
||||
.create_ctrl = nvme_loop_create_ctrl,
|
||||
};
|
||||
|
||||
static int __init nvme_loop_init_module(void)
|
||||
{
|
||||
int ret;
|
||||
|
||||
ret = nvmet_register_transport(&nvme_loop_ops);
|
||||
if (ret)
|
||||
return ret;
|
||||
nvmf_register_transport(&nvme_loop_transport);
|
||||
return 0;
|
||||
}
|
||||
|
||||
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_loop_del_ctrl(ctrl);
|
||||
mutex_unlock(&nvme_loop_ctrl_mutex);
|
||||
|
||||
flush_scheduled_work();
|
||||
}
|
||||
|
||||
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 */
|
||||
Loading…
Reference in New Issue
Block a user