rdma.c 51.9 KB
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/*
 * NVMe over Fabrics RDMA host code.
 * Copyright (c) 2015-2016 HGST, a Western Digital Company.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 */
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/string.h>
#include <linux/atomic.h>
#include <linux/blk-mq.h>
#include <linux/types.h>
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/scatterlist.h>
#include <linux/nvme.h>
#include <asm/unaligned.h>

#include <rdma/ib_verbs.h>
#include <rdma/rdma_cm.h>
#include <linux/nvme-rdma.h>

#include "nvme.h"
#include "fabrics.h"


#define NVME_RDMA_CONNECT_TIMEOUT_MS	1000		/* 1 second */

#define NVME_RDMA_MAX_SEGMENT_SIZE	0xffffff	/* 24-bit SGL field */

#define NVME_RDMA_MAX_SEGMENTS		256

#define NVME_RDMA_MAX_INLINE_SEGMENTS	1

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static const char *const nvme_rdma_cm_status_strs[] = {
	[NVME_RDMA_CM_INVALID_LEN]	= "invalid length",
	[NVME_RDMA_CM_INVALID_RECFMT]	= "invalid record format",
	[NVME_RDMA_CM_INVALID_QID]	= "invalid queue ID",
	[NVME_RDMA_CM_INVALID_HSQSIZE]	= "invalid host SQ size",
	[NVME_RDMA_CM_INVALID_HRQSIZE]	= "invalid host RQ size",
	[NVME_RDMA_CM_NO_RSC]		= "resource not found",
	[NVME_RDMA_CM_INVALID_IRD]	= "invalid IRD",
	[NVME_RDMA_CM_INVALID_ORD]	= "Invalid ORD",
};

static const char *nvme_rdma_cm_msg(enum nvme_rdma_cm_status status)
{
	size_t index = status;

	if (index < ARRAY_SIZE(nvme_rdma_cm_status_strs) &&
	    nvme_rdma_cm_status_strs[index])
		return nvme_rdma_cm_status_strs[index];
	else
		return "unrecognized reason";
};

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/*
 * We handle AEN commands ourselves and don't even let the
 * block layer know about them.
 */
#define NVME_RDMA_NR_AEN_COMMANDS      1
#define NVME_RDMA_AQ_BLKMQ_DEPTH       \
	(NVMF_AQ_DEPTH - NVME_RDMA_NR_AEN_COMMANDS)

struct nvme_rdma_device {
	struct ib_device       *dev;
	struct ib_pd	       *pd;
	struct kref		ref;
	struct list_head	entry;
};

struct nvme_rdma_qe {
	struct ib_cqe		cqe;
	void			*data;
	u64			dma;
};

struct nvme_rdma_queue;
struct nvme_rdma_request {
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	struct nvme_request	req;
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	struct ib_mr		*mr;
	struct nvme_rdma_qe	sqe;
	struct ib_sge		sge[1 + NVME_RDMA_MAX_INLINE_SEGMENTS];
	u32			num_sge;
	int			nents;
	bool			inline_data;
	struct ib_reg_wr	reg_wr;
	struct ib_cqe		reg_cqe;
	struct nvme_rdma_queue  *queue;
	struct sg_table		sg_table;
	struct scatterlist	first_sgl[];
};

enum nvme_rdma_queue_flags {
	NVME_RDMA_Q_CONNECTED = (1 << 0),
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	NVME_RDMA_IB_QUEUE_ALLOCATED = (1 << 1),
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	NVME_RDMA_Q_DELETING = (1 << 2),
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	NVME_RDMA_Q_LIVE = (1 << 3),
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};

struct nvme_rdma_queue {
	struct nvme_rdma_qe	*rsp_ring;
	u8			sig_count;
	int			queue_size;
	size_t			cmnd_capsule_len;
	struct nvme_rdma_ctrl	*ctrl;
	struct nvme_rdma_device	*device;
	struct ib_cq		*ib_cq;
	struct ib_qp		*qp;

	unsigned long		flags;
	struct rdma_cm_id	*cm_id;
	int			cm_error;
	struct completion	cm_done;
};

struct nvme_rdma_ctrl {
	/* read and written in the hot path */
	spinlock_t		lock;

	/* read only in the hot path */
	struct nvme_rdma_queue	*queues;
	u32			queue_count;

	/* other member variables */
	struct blk_mq_tag_set	tag_set;
	struct work_struct	delete_work;
	struct work_struct	reset_work;
	struct work_struct	err_work;

	struct nvme_rdma_qe	async_event_sqe;

	int			reconnect_delay;
	struct delayed_work	reconnect_work;

	struct list_head	list;

	struct blk_mq_tag_set	admin_tag_set;
	struct nvme_rdma_device	*device;

	u64			cap;
	u32			max_fr_pages;

	union {
		struct sockaddr addr;
		struct sockaddr_in addr_in;
	};

	struct nvme_ctrl	ctrl;
};

static inline struct nvme_rdma_ctrl *to_rdma_ctrl(struct nvme_ctrl *ctrl)
{
	return container_of(ctrl, struct nvme_rdma_ctrl, ctrl);
}

static LIST_HEAD(device_list);
static DEFINE_MUTEX(device_list_mutex);

static LIST_HEAD(nvme_rdma_ctrl_list);
static DEFINE_MUTEX(nvme_rdma_ctrl_mutex);

static struct workqueue_struct *nvme_rdma_wq;

/*
 * Disabling this option makes small I/O goes faster, but is fundamentally
 * unsafe.  With it turned off we will have to register a global rkey that
 * allows read and write access to all physical memory.
 */
static bool register_always = true;
module_param(register_always, bool, 0444);
MODULE_PARM_DESC(register_always,
	 "Use memory registration even for contiguous memory regions");

static int nvme_rdma_cm_handler(struct rdma_cm_id *cm_id,
		struct rdma_cm_event *event);
static void nvme_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc);

/* XXX: really should move to a generic header sooner or later.. */
static inline void put_unaligned_le24(u32 val, u8 *p)
{
	*p++ = val;
	*p++ = val >> 8;
	*p++ = val >> 16;
}

static inline int nvme_rdma_queue_idx(struct nvme_rdma_queue *queue)
{
	return queue - queue->ctrl->queues;
}

static inline size_t nvme_rdma_inline_data_size(struct nvme_rdma_queue *queue)
{
	return queue->cmnd_capsule_len - sizeof(struct nvme_command);
}

static void nvme_rdma_free_qe(struct ib_device *ibdev, struct nvme_rdma_qe *qe,
		size_t capsule_size, enum dma_data_direction dir)
{
	ib_dma_unmap_single(ibdev, qe->dma, capsule_size, dir);
	kfree(qe->data);
}

static int nvme_rdma_alloc_qe(struct ib_device *ibdev, struct nvme_rdma_qe *qe,
		size_t capsule_size, enum dma_data_direction dir)
{
	qe->data = kzalloc(capsule_size, GFP_KERNEL);
	if (!qe->data)
		return -ENOMEM;

	qe->dma = ib_dma_map_single(ibdev, qe->data, capsule_size, dir);
	if (ib_dma_mapping_error(ibdev, qe->dma)) {
		kfree(qe->data);
		return -ENOMEM;
	}

	return 0;
}

static void nvme_rdma_free_ring(struct ib_device *ibdev,
		struct nvme_rdma_qe *ring, size_t ib_queue_size,
		size_t capsule_size, enum dma_data_direction dir)
{
	int i;

	for (i = 0; i < ib_queue_size; i++)
		nvme_rdma_free_qe(ibdev, &ring[i], capsule_size, dir);
	kfree(ring);
}

static struct nvme_rdma_qe *nvme_rdma_alloc_ring(struct ib_device *ibdev,
		size_t ib_queue_size, size_t capsule_size,
		enum dma_data_direction dir)
{
	struct nvme_rdma_qe *ring;
	int i;

	ring = kcalloc(ib_queue_size, sizeof(struct nvme_rdma_qe), GFP_KERNEL);
	if (!ring)
		return NULL;

	for (i = 0; i < ib_queue_size; i++) {
		if (nvme_rdma_alloc_qe(ibdev, &ring[i], capsule_size, dir))
			goto out_free_ring;
	}

	return ring;

out_free_ring:
	nvme_rdma_free_ring(ibdev, ring, i, capsule_size, dir);
	return NULL;
}

static void nvme_rdma_qp_event(struct ib_event *event, void *context)
{
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	pr_debug("QP event %s (%d)\n",
		 ib_event_msg(event->event), event->event);

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}

static int nvme_rdma_wait_for_cm(struct nvme_rdma_queue *queue)
{
	wait_for_completion_interruptible_timeout(&queue->cm_done,
			msecs_to_jiffies(NVME_RDMA_CONNECT_TIMEOUT_MS) + 1);
	return queue->cm_error;
}

static int nvme_rdma_create_qp(struct nvme_rdma_queue *queue, const int factor)
{
	struct nvme_rdma_device *dev = queue->device;
	struct ib_qp_init_attr init_attr;
	int ret;

	memset(&init_attr, 0, sizeof(init_attr));
	init_attr.event_handler = nvme_rdma_qp_event;
	/* +1 for drain */
	init_attr.cap.max_send_wr = factor * queue->queue_size + 1;
	/* +1 for drain */
	init_attr.cap.max_recv_wr = queue->queue_size + 1;
	init_attr.cap.max_recv_sge = 1;
	init_attr.cap.max_send_sge = 1 + NVME_RDMA_MAX_INLINE_SEGMENTS;
	init_attr.sq_sig_type = IB_SIGNAL_REQ_WR;
	init_attr.qp_type = IB_QPT_RC;
	init_attr.send_cq = queue->ib_cq;
	init_attr.recv_cq = queue->ib_cq;

	ret = rdma_create_qp(queue->cm_id, dev->pd, &init_attr);

	queue->qp = queue->cm_id->qp;
	return ret;
}

static int nvme_rdma_reinit_request(void *data, struct request *rq)
{
	struct nvme_rdma_ctrl *ctrl = data;
	struct nvme_rdma_device *dev = ctrl->device;
	struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
	int ret = 0;

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	if (!req->mr->need_inval)
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		goto out;

	ib_dereg_mr(req->mr);

	req->mr = ib_alloc_mr(dev->pd, IB_MR_TYPE_MEM_REG,
			ctrl->max_fr_pages);
	if (IS_ERR(req->mr)) {
		ret = PTR_ERR(req->mr);
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		req->mr = NULL;
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		goto out;
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	}

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	req->mr->need_inval = false;
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out:
	return ret;
}

static void __nvme_rdma_exit_request(struct nvme_rdma_ctrl *ctrl,
		struct request *rq, unsigned int queue_idx)
{
	struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
	struct nvme_rdma_queue *queue = &ctrl->queues[queue_idx];
	struct nvme_rdma_device *dev = queue->device;

	if (req->mr)
		ib_dereg_mr(req->mr);

	nvme_rdma_free_qe(dev->dev, &req->sqe, sizeof(struct nvme_command),
			DMA_TO_DEVICE);
}

static void nvme_rdma_exit_request(void *data, struct request *rq,
				unsigned int hctx_idx, unsigned int rq_idx)
{
	return __nvme_rdma_exit_request(data, rq, hctx_idx + 1);
}

static void nvme_rdma_exit_admin_request(void *data, struct request *rq,
				unsigned int hctx_idx, unsigned int rq_idx)
{
	return __nvme_rdma_exit_request(data, rq, 0);
}

static int __nvme_rdma_init_request(struct nvme_rdma_ctrl *ctrl,
		struct request *rq, unsigned int queue_idx)
{
	struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
	struct nvme_rdma_queue *queue = &ctrl->queues[queue_idx];
	struct nvme_rdma_device *dev = queue->device;
	struct ib_device *ibdev = dev->dev;
	int ret;

	BUG_ON(queue_idx >= ctrl->queue_count);

	ret = nvme_rdma_alloc_qe(ibdev, &req->sqe, sizeof(struct nvme_command),
			DMA_TO_DEVICE);
	if (ret)
		return ret;

	req->mr = ib_alloc_mr(dev->pd, IB_MR_TYPE_MEM_REG,
			ctrl->max_fr_pages);
	if (IS_ERR(req->mr)) {
		ret = PTR_ERR(req->mr);
		goto out_free_qe;
	}

	req->queue = queue;

	return 0;

out_free_qe:
	nvme_rdma_free_qe(dev->dev, &req->sqe, sizeof(struct nvme_command),
			DMA_TO_DEVICE);
	return -ENOMEM;
}

static int nvme_rdma_init_request(void *data, struct request *rq,
				unsigned int hctx_idx, unsigned int rq_idx,
				unsigned int numa_node)
{
	return __nvme_rdma_init_request(data, rq, hctx_idx + 1);
}

static int nvme_rdma_init_admin_request(void *data, struct request *rq,
				unsigned int hctx_idx, unsigned int rq_idx,
				unsigned int numa_node)
{
	return __nvme_rdma_init_request(data, rq, 0);
}

static int nvme_rdma_init_hctx(struct blk_mq_hw_ctx *hctx, void *data,
		unsigned int hctx_idx)
{
	struct nvme_rdma_ctrl *ctrl = data;
	struct nvme_rdma_queue *queue = &ctrl->queues[hctx_idx + 1];

	BUG_ON(hctx_idx >= ctrl->queue_count);

	hctx->driver_data = queue;
	return 0;
}

static int nvme_rdma_init_admin_hctx(struct blk_mq_hw_ctx *hctx, void *data,
		unsigned int hctx_idx)
{
	struct nvme_rdma_ctrl *ctrl = data;
	struct nvme_rdma_queue *queue = &ctrl->queues[0];

	BUG_ON(hctx_idx != 0);

	hctx->driver_data = queue;
	return 0;
}

static void nvme_rdma_free_dev(struct kref *ref)
{
	struct nvme_rdma_device *ndev =
		container_of(ref, struct nvme_rdma_device, ref);

	mutex_lock(&device_list_mutex);
	list_del(&ndev->entry);
	mutex_unlock(&device_list_mutex);

	ib_dealloc_pd(ndev->pd);
	kfree(ndev);
}

static void nvme_rdma_dev_put(struct nvme_rdma_device *dev)
{
	kref_put(&dev->ref, nvme_rdma_free_dev);
}

static int nvme_rdma_dev_get(struct nvme_rdma_device *dev)
{
	return kref_get_unless_zero(&dev->ref);
}

static struct nvme_rdma_device *
nvme_rdma_find_get_device(struct rdma_cm_id *cm_id)
{
	struct nvme_rdma_device *ndev;

	mutex_lock(&device_list_mutex);
	list_for_each_entry(ndev, &device_list, entry) {
		if (ndev->dev->node_guid == cm_id->device->node_guid &&
		    nvme_rdma_dev_get(ndev))
			goto out_unlock;
	}

	ndev = kzalloc(sizeof(*ndev), GFP_KERNEL);
	if (!ndev)
		goto out_err;

	ndev->dev = cm_id->device;
	kref_init(&ndev->ref);

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	ndev->pd = ib_alloc_pd(ndev->dev,
		register_always ? 0 : IB_PD_UNSAFE_GLOBAL_RKEY);
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	if (IS_ERR(ndev->pd))
		goto out_free_dev;

	if (!(ndev->dev->attrs.device_cap_flags &
	      IB_DEVICE_MEM_MGT_EXTENSIONS)) {
		dev_err(&ndev->dev->dev,
			"Memory registrations not supported.\n");
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		goto out_free_pd;
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	}

	list_add(&ndev->entry, &device_list);
out_unlock:
	mutex_unlock(&device_list_mutex);
	return ndev;

out_free_pd:
	ib_dealloc_pd(ndev->pd);
out_free_dev:
	kfree(ndev);
out_err:
	mutex_unlock(&device_list_mutex);
	return NULL;
}

static void nvme_rdma_destroy_queue_ib(struct nvme_rdma_queue *queue)
{
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	struct nvme_rdma_device *dev;
	struct ib_device *ibdev;
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	if (!test_and_clear_bit(NVME_RDMA_IB_QUEUE_ALLOCATED, &queue->flags))
		return;

	dev = queue->device;
	ibdev = dev->dev;
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	rdma_destroy_qp(queue->cm_id);
	ib_free_cq(queue->ib_cq);

	nvme_rdma_free_ring(ibdev, queue->rsp_ring, queue->queue_size,
			sizeof(struct nvme_completion), DMA_FROM_DEVICE);

	nvme_rdma_dev_put(dev);
}

static int nvme_rdma_create_queue_ib(struct nvme_rdma_queue *queue,
		struct nvme_rdma_device *dev)
{
	struct ib_device *ibdev = dev->dev;
	const int send_wr_factor = 3;			/* MR, SEND, INV */
	const int cq_factor = send_wr_factor + 1;	/* + RECV */
	int comp_vector, idx = nvme_rdma_queue_idx(queue);

	int ret;

	queue->device = dev;

	/*
	 * The admin queue is barely used once the controller is live, so don't
	 * bother to spread it out.
	 */
	if (idx == 0)
		comp_vector = 0;
	else
		comp_vector = idx % ibdev->num_comp_vectors;


	/* +1 for ib_stop_cq */
	queue->ib_cq = ib_alloc_cq(dev->dev, queue,
				cq_factor * queue->queue_size + 1, comp_vector,
				IB_POLL_SOFTIRQ);
	if (IS_ERR(queue->ib_cq)) {
		ret = PTR_ERR(queue->ib_cq);
		goto out;
	}

	ret = nvme_rdma_create_qp(queue, send_wr_factor);
	if (ret)
		goto out_destroy_ib_cq;

	queue->rsp_ring = nvme_rdma_alloc_ring(ibdev, queue->queue_size,
			sizeof(struct nvme_completion), DMA_FROM_DEVICE);
	if (!queue->rsp_ring) {
		ret = -ENOMEM;
		goto out_destroy_qp;
	}
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	set_bit(NVME_RDMA_IB_QUEUE_ALLOCATED, &queue->flags);
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	return 0;

out_destroy_qp:
	ib_destroy_qp(queue->qp);
out_destroy_ib_cq:
	ib_free_cq(queue->ib_cq);
out:
	return ret;
}

static int nvme_rdma_init_queue(struct nvme_rdma_ctrl *ctrl,
		int idx, size_t queue_size)
{
	struct nvme_rdma_queue *queue;
	int ret;

	queue = &ctrl->queues[idx];
	queue->ctrl = ctrl;
	init_completion(&queue->cm_done);

	if (idx > 0)
		queue->cmnd_capsule_len = ctrl->ctrl.ioccsz * 16;
	else
		queue->cmnd_capsule_len = sizeof(struct nvme_command);

	queue->queue_size = queue_size;

	queue->cm_id = rdma_create_id(&init_net, nvme_rdma_cm_handler, queue,
			RDMA_PS_TCP, IB_QPT_RC);
	if (IS_ERR(queue->cm_id)) {
		dev_info(ctrl->ctrl.device,
			"failed to create CM ID: %ld\n", PTR_ERR(queue->cm_id));
		return PTR_ERR(queue->cm_id);
	}

	queue->cm_error = -ETIMEDOUT;
	ret = rdma_resolve_addr(queue->cm_id, NULL, &ctrl->addr,
			NVME_RDMA_CONNECT_TIMEOUT_MS);
	if (ret) {
		dev_info(ctrl->ctrl.device,
			"rdma_resolve_addr failed (%d).\n", ret);
		goto out_destroy_cm_id;
	}

	ret = nvme_rdma_wait_for_cm(queue);
	if (ret) {
		dev_info(ctrl->ctrl.device,
			"rdma_resolve_addr wait failed (%d).\n", ret);
		goto out_destroy_cm_id;
	}

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	clear_bit(NVME_RDMA_Q_DELETING, &queue->flags);
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	set_bit(NVME_RDMA_Q_CONNECTED, &queue->flags);

	return 0;

out_destroy_cm_id:
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	nvme_rdma_destroy_queue_ib(queue);
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	rdma_destroy_id(queue->cm_id);
	return ret;
}

static void nvme_rdma_stop_queue(struct nvme_rdma_queue *queue)
{
	rdma_disconnect(queue->cm_id);
	ib_drain_qp(queue->qp);
}

static void nvme_rdma_free_queue(struct nvme_rdma_queue *queue)
{
	nvme_rdma_destroy_queue_ib(queue);
	rdma_destroy_id(queue->cm_id);
}

static void nvme_rdma_stop_and_free_queue(struct nvme_rdma_queue *queue)
{
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	if (test_and_set_bit(NVME_RDMA_Q_DELETING, &queue->flags))
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		return;
	nvme_rdma_stop_queue(queue);
	nvme_rdma_free_queue(queue);
}

static void nvme_rdma_free_io_queues(struct nvme_rdma_ctrl *ctrl)
{
	int i;

	for (i = 1; i < ctrl->queue_count; i++)
		nvme_rdma_stop_and_free_queue(&ctrl->queues[i]);
}

static int nvme_rdma_connect_io_queues(struct nvme_rdma_ctrl *ctrl)
{
	int i, ret = 0;

	for (i = 1; i < ctrl->queue_count; i++) {
		ret = nvmf_connect_io_queue(&ctrl->ctrl, i);
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		if (ret) {
			dev_info(ctrl->ctrl.device,
				"failed to connect i/o queue: %d\n", ret);
			goto out_free_queues;
		}
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		set_bit(NVME_RDMA_Q_LIVE, &ctrl->queues[i].flags);
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	}

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	return 0;

out_free_queues:
	nvme_rdma_free_io_queues(ctrl);
664 665 666 667 668 669 670 671
	return ret;
}

static int nvme_rdma_init_io_queues(struct nvme_rdma_ctrl *ctrl)
{
	int i, ret;

	for (i = 1; i < ctrl->queue_count; i++) {
672 673
		ret = nvme_rdma_init_queue(ctrl, i,
					   ctrl->ctrl.opts->queue_size);
674 675 676 677 678 679 680 681 682 683
		if (ret) {
			dev_info(ctrl->ctrl.device,
				"failed to initialize i/o queue: %d\n", ret);
			goto out_free_queues;
		}
	}

	return 0;

out_free_queues:
684
	for (i--; i >= 1; i--)
685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747
		nvme_rdma_stop_and_free_queue(&ctrl->queues[i]);

	return ret;
}

static void nvme_rdma_destroy_admin_queue(struct nvme_rdma_ctrl *ctrl)
{
	nvme_rdma_free_qe(ctrl->queues[0].device->dev, &ctrl->async_event_sqe,
			sizeof(struct nvme_command), DMA_TO_DEVICE);
	nvme_rdma_stop_and_free_queue(&ctrl->queues[0]);
	blk_cleanup_queue(ctrl->ctrl.admin_q);
	blk_mq_free_tag_set(&ctrl->admin_tag_set);
	nvme_rdma_dev_put(ctrl->device);
}

static void nvme_rdma_free_ctrl(struct nvme_ctrl *nctrl)
{
	struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(nctrl);

	if (list_empty(&ctrl->list))
		goto free_ctrl;

	mutex_lock(&nvme_rdma_ctrl_mutex);
	list_del(&ctrl->list);
	mutex_unlock(&nvme_rdma_ctrl_mutex);

	kfree(ctrl->queues);
	nvmf_free_options(nctrl->opts);
free_ctrl:
	kfree(ctrl);
}

static void nvme_rdma_reconnect_ctrl_work(struct work_struct *work)
{
	struct nvme_rdma_ctrl *ctrl = container_of(to_delayed_work(work),
			struct nvme_rdma_ctrl, reconnect_work);
	bool changed;
	int ret;

	if (ctrl->queue_count > 1) {
		nvme_rdma_free_io_queues(ctrl);

		ret = blk_mq_reinit_tagset(&ctrl->tag_set);
		if (ret)
			goto requeue;
	}

	nvme_rdma_stop_and_free_queue(&ctrl->queues[0]);

	ret = blk_mq_reinit_tagset(&ctrl->admin_tag_set);
	if (ret)
		goto requeue;

	ret = nvme_rdma_init_queue(ctrl, 0, NVMF_AQ_DEPTH);
	if (ret)
		goto requeue;

	blk_mq_start_stopped_hw_queues(ctrl->ctrl.admin_q, true);

	ret = nvmf_connect_admin_queue(&ctrl->ctrl);
	if (ret)
		goto stop_admin_q;

748 749
	set_bit(NVME_RDMA_Q_LIVE, &ctrl->queues[0].flags);

750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768
	ret = nvme_enable_ctrl(&ctrl->ctrl, ctrl->cap);
	if (ret)
		goto stop_admin_q;

	nvme_start_keep_alive(&ctrl->ctrl);

	if (ctrl->queue_count > 1) {
		ret = nvme_rdma_init_io_queues(ctrl);
		if (ret)
			goto stop_admin_q;

		ret = nvme_rdma_connect_io_queues(ctrl);
		if (ret)
			goto stop_admin_q;
	}

	changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE);
	WARN_ON_ONCE(!changed);

769
	if (ctrl->queue_count > 1) {
770
		nvme_start_queues(&ctrl->ctrl);
771
		nvme_queue_scan(&ctrl->ctrl);
772
		nvme_queue_async_events(&ctrl->ctrl);
773
	}
774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794

	dev_info(ctrl->ctrl.device, "Successfully reconnected\n");

	return;

stop_admin_q:
	blk_mq_stop_hw_queues(ctrl->ctrl.admin_q);
requeue:
	/* Make sure we are not resetting/deleting */
	if (ctrl->ctrl.state == NVME_CTRL_RECONNECTING) {
		dev_info(ctrl->ctrl.device,
			"Failed reconnect attempt, requeueing...\n");
		queue_delayed_work(nvme_rdma_wq, &ctrl->reconnect_work,
					ctrl->reconnect_delay * HZ);
	}
}

static void nvme_rdma_error_recovery_work(struct work_struct *work)
{
	struct nvme_rdma_ctrl *ctrl = container_of(work,
			struct nvme_rdma_ctrl, err_work);
795
	int i;
796 797

	nvme_stop_keep_alive(&ctrl->ctrl);
798

799
	for (i = 0; i < ctrl->queue_count; i++) {
800
		clear_bit(NVME_RDMA_Q_CONNECTED, &ctrl->queues[i].flags);
801 802
		clear_bit(NVME_RDMA_Q_LIVE, &ctrl->queues[i].flags);
	}
803

804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885
	if (ctrl->queue_count > 1)
		nvme_stop_queues(&ctrl->ctrl);
	blk_mq_stop_hw_queues(ctrl->ctrl.admin_q);

	/* We must take care of fastfail/requeue all our inflight requests */
	if (ctrl->queue_count > 1)
		blk_mq_tagset_busy_iter(&ctrl->tag_set,
					nvme_cancel_request, &ctrl->ctrl);
	blk_mq_tagset_busy_iter(&ctrl->admin_tag_set,
				nvme_cancel_request, &ctrl->ctrl);

	dev_info(ctrl->ctrl.device, "reconnecting in %d seconds\n",
		ctrl->reconnect_delay);

	queue_delayed_work(nvme_rdma_wq, &ctrl->reconnect_work,
				ctrl->reconnect_delay * HZ);
}

static void nvme_rdma_error_recovery(struct nvme_rdma_ctrl *ctrl)
{
	if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_RECONNECTING))
		return;

	queue_work(nvme_rdma_wq, &ctrl->err_work);
}

static void nvme_rdma_wr_error(struct ib_cq *cq, struct ib_wc *wc,
		const char *op)
{
	struct nvme_rdma_queue *queue = cq->cq_context;
	struct nvme_rdma_ctrl *ctrl = queue->ctrl;

	if (ctrl->ctrl.state == NVME_CTRL_LIVE)
		dev_info(ctrl->ctrl.device,
			     "%s for CQE 0x%p failed with status %s (%d)\n",
			     op, wc->wr_cqe,
			     ib_wc_status_msg(wc->status), wc->status);
	nvme_rdma_error_recovery(ctrl);
}

static void nvme_rdma_memreg_done(struct ib_cq *cq, struct ib_wc *wc)
{
	if (unlikely(wc->status != IB_WC_SUCCESS))
		nvme_rdma_wr_error(cq, wc, "MEMREG");
}

static void nvme_rdma_inv_rkey_done(struct ib_cq *cq, struct ib_wc *wc)
{
	if (unlikely(wc->status != IB_WC_SUCCESS))
		nvme_rdma_wr_error(cq, wc, "LOCAL_INV");
}

static int nvme_rdma_inv_rkey(struct nvme_rdma_queue *queue,
		struct nvme_rdma_request *req)
{
	struct ib_send_wr *bad_wr;
	struct ib_send_wr wr = {
		.opcode		    = IB_WR_LOCAL_INV,
		.next		    = NULL,
		.num_sge	    = 0,
		.send_flags	    = 0,
		.ex.invalidate_rkey = req->mr->rkey,
	};

	req->reg_cqe.done = nvme_rdma_inv_rkey_done;
	wr.wr_cqe = &req->reg_cqe;

	return ib_post_send(queue->qp, &wr, &bad_wr);
}

static void nvme_rdma_unmap_data(struct nvme_rdma_queue *queue,
		struct request *rq)
{
	struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
	struct nvme_rdma_ctrl *ctrl = queue->ctrl;
	struct nvme_rdma_device *dev = queue->device;
	struct ib_device *ibdev = dev->dev;
	int res;

	if (!blk_rq_bytes(rq))
		return;

886
	if (req->mr->need_inval) {
887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939
		res = nvme_rdma_inv_rkey(queue, req);
		if (res < 0) {
			dev_err(ctrl->ctrl.device,
				"Queueing INV WR for rkey %#x failed (%d)\n",
				req->mr->rkey, res);
			nvme_rdma_error_recovery(queue->ctrl);
		}
	}

	ib_dma_unmap_sg(ibdev, req->sg_table.sgl,
			req->nents, rq_data_dir(rq) ==
				    WRITE ? DMA_TO_DEVICE : DMA_FROM_DEVICE);

	nvme_cleanup_cmd(rq);
	sg_free_table_chained(&req->sg_table, true);
}

static int nvme_rdma_set_sg_null(struct nvme_command *c)
{
	struct nvme_keyed_sgl_desc *sg = &c->common.dptr.ksgl;

	sg->addr = 0;
	put_unaligned_le24(0, sg->length);
	put_unaligned_le32(0, sg->key);
	sg->type = NVME_KEY_SGL_FMT_DATA_DESC << 4;
	return 0;
}

static int nvme_rdma_map_sg_inline(struct nvme_rdma_queue *queue,
		struct nvme_rdma_request *req, struct nvme_command *c)
{
	struct nvme_sgl_desc *sg = &c->common.dptr.sgl;

	req->sge[1].addr = sg_dma_address(req->sg_table.sgl);
	req->sge[1].length = sg_dma_len(req->sg_table.sgl);
	req->sge[1].lkey = queue->device->pd->local_dma_lkey;

	sg->addr = cpu_to_le64(queue->ctrl->ctrl.icdoff);
	sg->length = cpu_to_le32(sg_dma_len(req->sg_table.sgl));
	sg->type = (NVME_SGL_FMT_DATA_DESC << 4) | NVME_SGL_FMT_OFFSET;

	req->inline_data = true;
	req->num_sge++;
	return 0;
}

static int nvme_rdma_map_sg_single(struct nvme_rdma_queue *queue,
		struct nvme_rdma_request *req, struct nvme_command *c)
{
	struct nvme_keyed_sgl_desc *sg = &c->common.dptr.ksgl;

	sg->addr = cpu_to_le64(sg_dma_address(req->sg_table.sgl));
	put_unaligned_le24(sg_dma_len(req->sg_table.sgl), sg->length);
940
	put_unaligned_le32(queue->device->pd->unsafe_global_rkey, sg->key);
941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971
	sg->type = NVME_KEY_SGL_FMT_DATA_DESC << 4;
	return 0;
}

static int nvme_rdma_map_sg_fr(struct nvme_rdma_queue *queue,
		struct nvme_rdma_request *req, struct nvme_command *c,
		int count)
{
	struct nvme_keyed_sgl_desc *sg = &c->common.dptr.ksgl;
	int nr;

	nr = ib_map_mr_sg(req->mr, req->sg_table.sgl, count, NULL, PAGE_SIZE);
	if (nr < count) {
		if (nr < 0)
			return nr;
		return -EINVAL;
	}

	ib_update_fast_reg_key(req->mr, ib_inc_rkey(req->mr->rkey));

	req->reg_cqe.done = nvme_rdma_memreg_done;
	memset(&req->reg_wr, 0, sizeof(req->reg_wr));
	req->reg_wr.wr.opcode = IB_WR_REG_MR;
	req->reg_wr.wr.wr_cqe = &req->reg_cqe;
	req->reg_wr.wr.num_sge = 0;
	req->reg_wr.mr = req->mr;
	req->reg_wr.key = req->mr->rkey;
	req->reg_wr.access = IB_ACCESS_LOCAL_WRITE |
			     IB_ACCESS_REMOTE_READ |
			     IB_ACCESS_REMOTE_WRITE;

972
	req->mr->need_inval = true;
973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989

	sg->addr = cpu_to_le64(req->mr->iova);
	put_unaligned_le24(req->mr->length, sg->length);
	put_unaligned_le32(req->mr->rkey, sg->key);
	sg->type = (NVME_KEY_SGL_FMT_DATA_DESC << 4) |
			NVME_SGL_FMT_INVALIDATE;

	return 0;
}

static int nvme_rdma_map_data(struct nvme_rdma_queue *queue,
		struct request *rq, unsigned int map_len,
		struct nvme_command *c)
{
	struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
	struct nvme_rdma_device *dev = queue->device;
	struct ib_device *ibdev = dev->dev;
990
	int count, ret;
991 992 993

	req->num_sge = 1;
	req->inline_data = false;
994
	req->mr->need_inval = false;
995 996 997 998 999 1000 1001

	c->common.flags |= NVME_CMD_SGL_METABUF;

	if (!blk_rq_bytes(rq))
		return nvme_rdma_set_sg_null(c);

	req->sg_table.sgl = req->first_sgl;
1002 1003
	ret = sg_alloc_table_chained(&req->sg_table,
			blk_rq_nr_phys_segments(rq), req->sg_table.sgl);
1004 1005 1006
	if (ret)
		return -ENOMEM;

1007
	req->nents = blk_rq_map_sg(rq->q, rq, req->sg_table.sgl);
1008

1009
	count = ib_dma_map_sg(ibdev, req->sg_table.sgl, req->nents,
1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021
		    rq_data_dir(rq) == WRITE ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
	if (unlikely(count <= 0)) {
		sg_free_table_chained(&req->sg_table, true);
		return -EIO;
	}

	if (count == 1) {
		if (rq_data_dir(rq) == WRITE &&
		    map_len <= nvme_rdma_inline_data_size(queue) &&
		    nvme_rdma_queue_idx(queue))
			return nvme_rdma_map_sg_inline(queue, req, c);

1022
		if (dev->pd->flags & IB_PD_UNSAFE_GLOBAL_RKEY)
1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172
			return nvme_rdma_map_sg_single(queue, req, c);
	}

	return nvme_rdma_map_sg_fr(queue, req, c, count);
}

static void nvme_rdma_send_done(struct ib_cq *cq, struct ib_wc *wc)
{
	if (unlikely(wc->status != IB_WC_SUCCESS))
		nvme_rdma_wr_error(cq, wc, "SEND");
}

static int nvme_rdma_post_send(struct nvme_rdma_queue *queue,
		struct nvme_rdma_qe *qe, struct ib_sge *sge, u32 num_sge,
		struct ib_send_wr *first, bool flush)
{
	struct ib_send_wr wr, *bad_wr;
	int ret;

	sge->addr   = qe->dma;
	sge->length = sizeof(struct nvme_command),
	sge->lkey   = queue->device->pd->local_dma_lkey;

	qe->cqe.done = nvme_rdma_send_done;

	wr.next       = NULL;
	wr.wr_cqe     = &qe->cqe;
	wr.sg_list    = sge;
	wr.num_sge    = num_sge;
	wr.opcode     = IB_WR_SEND;
	wr.send_flags = 0;

	/*
	 * Unsignalled send completions are another giant desaster in the
	 * IB Verbs spec:  If we don't regularly post signalled sends
	 * the send queue will fill up and only a QP reset will rescue us.
	 * Would have been way to obvious to handle this in hardware or
	 * at least the RDMA stack..
	 *
	 * This messy and racy code sniplet is copy and pasted from the iSER
	 * initiator, and the magic '32' comes from there as well.
	 *
	 * Always signal the flushes. The magic request used for the flush
	 * sequencer is not allocated in our driver's tagset and it's
	 * triggered to be freed by blk_cleanup_queue(). So we need to
	 * always mark it as signaled to ensure that the "wr_cqe", which is
	 * embeded in request's payload, is not freed when __ib_process_cq()
	 * calls wr_cqe->done().
	 */
	if ((++queue->sig_count % 32) == 0 || flush)
		wr.send_flags |= IB_SEND_SIGNALED;

	if (first)
		first->next = &wr;
	else
		first = &wr;

	ret = ib_post_send(queue->qp, first, &bad_wr);
	if (ret) {
		dev_err(queue->ctrl->ctrl.device,
			     "%s failed with error code %d\n", __func__, ret);
	}
	return ret;
}

static int nvme_rdma_post_recv(struct nvme_rdma_queue *queue,
		struct nvme_rdma_qe *qe)
{
	struct ib_recv_wr wr, *bad_wr;
	struct ib_sge list;
	int ret;

	list.addr   = qe->dma;
	list.length = sizeof(struct nvme_completion);
	list.lkey   = queue->device->pd->local_dma_lkey;

	qe->cqe.done = nvme_rdma_recv_done;

	wr.next     = NULL;
	wr.wr_cqe   = &qe->cqe;
	wr.sg_list  = &list;
	wr.num_sge  = 1;

	ret = ib_post_recv(queue->qp, &wr, &bad_wr);
	if (ret) {
		dev_err(queue->ctrl->ctrl.device,
			"%s failed with error code %d\n", __func__, ret);
	}
	return ret;
}

static struct blk_mq_tags *nvme_rdma_tagset(struct nvme_rdma_queue *queue)
{
	u32 queue_idx = nvme_rdma_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_rdma_submit_async_event(struct nvme_ctrl *arg, int aer_idx)
{
	struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(arg);
	struct nvme_rdma_queue *queue = &ctrl->queues[0];
	struct ib_device *dev = queue->device->dev;
	struct nvme_rdma_qe *sqe = &ctrl->async_event_sqe;
	struct nvme_command *cmd = sqe->data;
	struct ib_sge sge;
	int ret;

	if (WARN_ON_ONCE(aer_idx != 0))
		return;

	ib_dma_sync_single_for_cpu(dev, sqe->dma, sizeof(*cmd), DMA_TO_DEVICE);

	memset(cmd, 0, sizeof(*cmd));
	cmd->common.opcode = nvme_admin_async_event;
	cmd->common.command_id = NVME_RDMA_AQ_BLKMQ_DEPTH;
	cmd->common.flags |= NVME_CMD_SGL_METABUF;
	nvme_rdma_set_sg_null(cmd);

	ib_dma_sync_single_for_device(dev, sqe->dma, sizeof(*cmd),
			DMA_TO_DEVICE);

	ret = nvme_rdma_post_send(queue, sqe, &sge, 1, NULL, false);
	WARN_ON_ONCE(ret);
}

static int nvme_rdma_process_nvme_rsp(struct nvme_rdma_queue *queue,
		struct nvme_completion *cqe, struct ib_wc *wc, int tag)
{
	struct request *rq;
	struct nvme_rdma_request *req;
	int ret = 0;

	rq = blk_mq_tag_to_rq(nvme_rdma_tagset(queue), cqe->command_id);
	if (!rq) {
		dev_err(queue->ctrl->ctrl.device,
			"tag 0x%x on QP %#x not found\n",
			cqe->command_id, queue->qp->qp_num);
		nvme_rdma_error_recovery(queue->ctrl);
		return ret;
	}
	req = blk_mq_rq_to_pdu(rq);

	if (rq->tag == tag)
		ret = 1;

	if ((wc->wc_flags & IB_WC_WITH_INVALIDATE) &&
	    wc->ex.invalidate_rkey == req->mr->rkey)
1173
		req->mr->need_inval = false;
1174

1175 1176
	req->req.result = cqe->result;
	blk_mq_complete_request(rq, le16_to_cpu(cqe->status) >> 1);
1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203
	return ret;
}

static int __nvme_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc, int tag)
{
	struct nvme_rdma_qe *qe =
		container_of(wc->wr_cqe, struct nvme_rdma_qe, cqe);
	struct nvme_rdma_queue *queue = cq->cq_context;
	struct ib_device *ibdev = queue->device->dev;
	struct nvme_completion *cqe = qe->data;
	const size_t len = sizeof(struct nvme_completion);
	int ret = 0;

	if (unlikely(wc->status != IB_WC_SUCCESS)) {
		nvme_rdma_wr_error(cq, wc, "RECV");
		return 0;
	}

	ib_dma_sync_single_for_cpu(ibdev, qe->dma, len, DMA_FROM_DEVICE);
	/*
	 * 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_rdma_queue_idx(queue) == 0 &&
			cqe->command_id >= NVME_RDMA_AQ_BLKMQ_DEPTH))
1204 1205
		nvme_complete_async_event(&queue->ctrl->ctrl, cqe->status,
				&cqe->result);
1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238
	else
		ret = nvme_rdma_process_nvme_rsp(queue, cqe, wc, tag);
	ib_dma_sync_single_for_device(ibdev, qe->dma, len, DMA_FROM_DEVICE);

	nvme_rdma_post_recv(queue, qe);
	return ret;
}

static void nvme_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc)
{
	__nvme_rdma_recv_done(cq, wc, -1);
}

static int nvme_rdma_conn_established(struct nvme_rdma_queue *queue)
{
	int ret, i;

	for (i = 0; i < queue->queue_size; i++) {
		ret = nvme_rdma_post_recv(queue, &queue->rsp_ring[i]);
		if (ret)
			goto out_destroy_queue_ib;
	}

	return 0;

out_destroy_queue_ib:
	nvme_rdma_destroy_queue_ib(queue);
	return ret;
}

static int nvme_rdma_conn_rejected(struct nvme_rdma_queue *queue,
		struct rdma_cm_event *ev)
{
1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249
	struct rdma_cm_id *cm_id = queue->cm_id;
	int status = ev->status;
	const char *rej_msg;
	const struct nvme_rdma_cm_rej *rej_data;
	u8 rej_data_len;

	rej_msg = rdma_reject_msg(cm_id, status);
	rej_data = rdma_consumer_reject_data(cm_id, ev, &rej_data_len);

	if (rej_data && rej_data_len >= sizeof(u16)) {
		u16 sts = le16_to_cpu(rej_data->sts);
1250 1251

		dev_err(queue->ctrl->ctrl.device,
1252 1253
		      "Connect rejected: status %d (%s) nvme status %d (%s).\n",
		      status, rej_msg, sts, nvme_rdma_cm_msg(sts));
1254 1255
	} else {
		dev_err(queue->ctrl->ctrl.device,
1256
			"Connect rejected: status %d (%s).\n", status, rej_msg);
1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299
	}

	return -ECONNRESET;
}

static int nvme_rdma_addr_resolved(struct nvme_rdma_queue *queue)
{
	struct nvme_rdma_device *dev;
	int ret;

	dev = nvme_rdma_find_get_device(queue->cm_id);
	if (!dev) {
		dev_err(queue->cm_id->device->dma_device,
			"no client data found!\n");
		return -ECONNREFUSED;
	}

	ret = nvme_rdma_create_queue_ib(queue, dev);
	if (ret) {
		nvme_rdma_dev_put(dev);
		goto out;
	}

	ret = rdma_resolve_route(queue->cm_id, NVME_RDMA_CONNECT_TIMEOUT_MS);
	if (ret) {
		dev_err(queue->ctrl->ctrl.device,
			"rdma_resolve_route failed (%d).\n",
			queue->cm_error);
		goto out_destroy_queue;
	}

	return 0;

out_destroy_queue:
	nvme_rdma_destroy_queue_ib(queue);
out:
	return ret;
}

static int nvme_rdma_route_resolved(struct nvme_rdma_queue *queue)
{
	struct nvme_rdma_ctrl *ctrl = queue->ctrl;
	struct rdma_conn_param param = { };
1300
	struct nvme_rdma_cm_req priv = { };
1301 1302 1303 1304 1305 1306
	int ret;

	param.qp_num = queue->qp->qp_num;
	param.flow_control = 1;

	param.responder_resources = queue->device->dev->attrs.max_qp_rd_atom;
1307 1308
	/* maximum retry count */
	param.retry_count = 7;
1309 1310 1311 1312 1313 1314
	param.rnr_retry_count = 7;
	param.private_data = &priv;
	param.private_data_len = sizeof(priv);

	priv.recfmt = cpu_to_le16(NVME_RDMA_CM_FMT_1_0);
	priv.qid = cpu_to_le16(nvme_rdma_queue_idx(queue));
1315 1316 1317 1318 1319 1320 1321 1322
	/*
	 * set the admin queue depth to the minimum size
	 * specified by the Fabrics standard.
	 */
	if (priv.qid == 0) {
		priv.hrqsize = cpu_to_le16(NVMF_AQ_DEPTH);
		priv.hsqsize = cpu_to_le16(NVMF_AQ_DEPTH - 1);
	} else {
1323 1324 1325 1326 1327
		/*
		 * current interpretation of the fabrics spec
		 * is at minimum you make hrqsize sqsize+1, or a
		 * 1's based representation of sqsize.
		 */
1328
		priv.hrqsize = cpu_to_le16(queue->queue_size);
1329
		priv.hsqsize = cpu_to_le16(queue->ctrl->ctrl.sqsize);
1330
	}
1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386

	ret = rdma_connect(queue->cm_id, &param);
	if (ret) {
		dev_err(ctrl->ctrl.device,
			"rdma_connect failed (%d).\n", ret);
		goto out_destroy_queue_ib;
	}

	return 0;

out_destroy_queue_ib:
	nvme_rdma_destroy_queue_ib(queue);
	return ret;
}

static int nvme_rdma_cm_handler(struct rdma_cm_id *cm_id,
		struct rdma_cm_event *ev)
{
	struct nvme_rdma_queue *queue = cm_id->context;
	int cm_error = 0;

	dev_dbg(queue->ctrl->ctrl.device, "%s (%d): status %d id %p\n",
		rdma_event_msg(ev->event), ev->event,
		ev->status, cm_id);

	switch (ev->event) {
	case RDMA_CM_EVENT_ADDR_RESOLVED:
		cm_error = nvme_rdma_addr_resolved(queue);
		break;
	case RDMA_CM_EVENT_ROUTE_RESOLVED:
		cm_error = nvme_rdma_route_resolved(queue);
		break;
	case RDMA_CM_EVENT_ESTABLISHED:
		queue->cm_error = nvme_rdma_conn_established(queue);
		/* complete cm_done regardless of success/failure */
		complete(&queue->cm_done);
		return 0;
	case RDMA_CM_EVENT_REJECTED:
		cm_error = nvme_rdma_conn_rejected(queue, ev);
		break;
	case RDMA_CM_EVENT_ADDR_ERROR:
	case RDMA_CM_EVENT_ROUTE_ERROR:
	case RDMA_CM_EVENT_CONNECT_ERROR:
	case RDMA_CM_EVENT_UNREACHABLE:
		dev_dbg(queue->ctrl->ctrl.device,
			"CM error event %d\n", ev->event);
		cm_error = -ECONNRESET;
		break;
	case RDMA_CM_EVENT_DISCONNECTED:
	case RDMA_CM_EVENT_ADDR_CHANGE:
	case RDMA_CM_EVENT_TIMEWAIT_EXIT:
		dev_dbg(queue->ctrl->ctrl.device,
			"disconnect received - connection closed\n");
		nvme_rdma_error_recovery(queue->ctrl);
		break;
	case RDMA_CM_EVENT_DEVICE_REMOVAL:
1387 1388
		/* device removal is handled via the ib_client API */
		break;
1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417
	default:
		dev_err(queue->ctrl->ctrl.device,
			"Unexpected RDMA CM event (%d)\n", ev->event);
		nvme_rdma_error_recovery(queue->ctrl);
		break;
	}

	if (cm_error) {
		queue->cm_error = cm_error;
		complete(&queue->cm_done);
	}

	return 0;
}

static enum blk_eh_timer_return
nvme_rdma_timeout(struct request *rq, bool reserved)
{
	struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);

	/* queue error recovery */
	nvme_rdma_error_recovery(req->queue->ctrl);

	/* fail with DNR on cmd timeout */
	rq->errors = NVME_SC_ABORT_REQ | NVME_SC_DNR;

	return BLK_EH_HANDLED;
}

1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435
/*
 * We cannot accept any other command until the Connect command has completed.
 */
static inline bool nvme_rdma_queue_is_ready(struct nvme_rdma_queue *queue,
		struct request *rq)
{
	if (unlikely(!test_bit(NVME_RDMA_Q_LIVE, &queue->flags))) {
		struct nvme_command *cmd = (struct nvme_command *)rq->cmd;

		if (rq->cmd_type != REQ_TYPE_DRV_PRIV ||
		    cmd->common.opcode != nvme_fabrics_command ||
		    cmd->fabrics.fctype != nvme_fabrics_type_connect)
			return false;
	}

	return true;
}

1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451
static int nvme_rdma_queue_rq(struct blk_mq_hw_ctx *hctx,
		const struct blk_mq_queue_data *bd)
{
	struct nvme_ns *ns = hctx->queue->queuedata;
	struct nvme_rdma_queue *queue = hctx->driver_data;
	struct request *rq = bd->rq;
	struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
	struct nvme_rdma_qe *sqe = &req->sqe;
	struct nvme_command *c = sqe->data;
	bool flush = false;
	struct ib_device *dev;
	unsigned int map_len;
	int ret;

	WARN_ON_ONCE(rq->tag < 0);

1452 1453 1454
	if (!nvme_rdma_queue_is_ready(queue, rq))
		return BLK_MQ_RQ_QUEUE_BUSY;

1455 1456 1457 1458 1459
	dev = queue->device->dev;
	ib_dma_sync_single_for_cpu(dev, sqe->dma,
			sizeof(struct nvme_command), DMA_TO_DEVICE);

	ret = nvme_setup_cmd(ns, rq, c);
1460
	if (ret != BLK_MQ_RQ_QUEUE_OK)
1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479
		return ret;

	blk_mq_start_request(rq);

	map_len = nvme_map_len(rq);
	ret = nvme_rdma_map_data(queue, rq, map_len, c);
	if (ret < 0) {
		dev_err(queue->ctrl->ctrl.device,
			     "Failed to map data (%d)\n", ret);
		nvme_cleanup_cmd(rq);
		goto err;
	}

	ib_dma_sync_single_for_device(dev, sqe->dma,
			sizeof(struct nvme_command), DMA_TO_DEVICE);

	if (rq->cmd_type == REQ_TYPE_FS && req_op(rq) == REQ_OP_FLUSH)
		flush = true;
	ret = nvme_rdma_post_send(queue, sqe, req->sge, req->num_sge,
1480
			req->mr->need_inval ? &req->reg_wr.wr : NULL, flush);
1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603
	if (ret) {
		nvme_rdma_unmap_data(queue, rq);
		goto err;
	}

	return BLK_MQ_RQ_QUEUE_OK;
err:
	return (ret == -ENOMEM || ret == -EAGAIN) ?
		BLK_MQ_RQ_QUEUE_BUSY : BLK_MQ_RQ_QUEUE_ERROR;
}

static int nvme_rdma_poll(struct blk_mq_hw_ctx *hctx, unsigned int tag)
{
	struct nvme_rdma_queue *queue = hctx->driver_data;
	struct ib_cq *cq = queue->ib_cq;
	struct ib_wc wc;
	int found = 0;

	ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
	while (ib_poll_cq(cq, 1, &wc) > 0) {
		struct ib_cqe *cqe = wc.wr_cqe;

		if (cqe) {
			if (cqe->done == nvme_rdma_recv_done)
				found |= __nvme_rdma_recv_done(cq, &wc, tag);
			else
				cqe->done(cq, &wc);
		}
	}

	return found;
}

static void nvme_rdma_complete_rq(struct request *rq)
{
	struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
	struct nvme_rdma_queue *queue = req->queue;
	int error = 0;

	nvme_rdma_unmap_data(queue, rq);

	if (unlikely(rq->errors)) {
		if (nvme_req_needs_retry(rq, rq->errors)) {
			nvme_requeue_req(rq);
			return;
		}

		if (rq->cmd_type == REQ_TYPE_DRV_PRIV)
			error = rq->errors;
		else
			error = nvme_error_status(rq->errors);
	}

	blk_mq_end_request(rq, error);
}

static struct blk_mq_ops nvme_rdma_mq_ops = {
	.queue_rq	= nvme_rdma_queue_rq,
	.complete	= nvme_rdma_complete_rq,
	.init_request	= nvme_rdma_init_request,
	.exit_request	= nvme_rdma_exit_request,
	.reinit_request	= nvme_rdma_reinit_request,
	.init_hctx	= nvme_rdma_init_hctx,
	.poll		= nvme_rdma_poll,
	.timeout	= nvme_rdma_timeout,
};

static struct blk_mq_ops nvme_rdma_admin_mq_ops = {
	.queue_rq	= nvme_rdma_queue_rq,
	.complete	= nvme_rdma_complete_rq,
	.init_request	= nvme_rdma_init_admin_request,
	.exit_request	= nvme_rdma_exit_admin_request,
	.reinit_request	= nvme_rdma_reinit_request,
	.init_hctx	= nvme_rdma_init_admin_hctx,
	.timeout	= nvme_rdma_timeout,
};

static int nvme_rdma_configure_admin_queue(struct nvme_rdma_ctrl *ctrl)
{
	int error;

	error = nvme_rdma_init_queue(ctrl, 0, NVMF_AQ_DEPTH);
	if (error)
		return error;

	ctrl->device = ctrl->queues[0].device;

	/*
	 * We need a reference on the device as long as the tag_set is alive,
	 * as the MRs in the request structures need a valid ib_device.
	 */
	error = -EINVAL;
	if (!nvme_rdma_dev_get(ctrl->device))
		goto out_free_queue;

	ctrl->max_fr_pages = min_t(u32, NVME_RDMA_MAX_SEGMENTS,
		ctrl->device->dev->attrs.max_fast_reg_page_list_len);

	memset(&ctrl->admin_tag_set, 0, sizeof(ctrl->admin_tag_set));
	ctrl->admin_tag_set.ops = &nvme_rdma_admin_mq_ops;
	ctrl->admin_tag_set.queue_depth = NVME_RDMA_AQ_BLKMQ_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_rdma_request) +
		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;

	error = blk_mq_alloc_tag_set(&ctrl->admin_tag_set);
	if (error)
		goto out_put_dev;

	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;

1604 1605
	set_bit(NVME_RDMA_Q_LIVE, &ctrl->queues[0].flags);

1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662
	error = nvmf_reg_read64(&ctrl->ctrl, NVME_REG_CAP, &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->cap) + 1, ctrl->ctrl.sqsize);

	error = nvme_enable_ctrl(&ctrl->ctrl, ctrl->cap);
	if (error)
		goto out_cleanup_queue;

	ctrl->ctrl.max_hw_sectors =
		(ctrl->max_fr_pages - 1) << (PAGE_SHIFT - 9);

	error = nvme_init_identify(&ctrl->ctrl);
	if (error)
		goto out_cleanup_queue;

	error = nvme_rdma_alloc_qe(ctrl->queues[0].device->dev,
			&ctrl->async_event_sqe, sizeof(struct nvme_command),
			DMA_TO_DEVICE);
	if (error)
		goto out_cleanup_queue;

	nvme_start_keep_alive(&ctrl->ctrl);

	return 0;

out_cleanup_queue:
	blk_cleanup_queue(ctrl->ctrl.admin_q);
out_free_tagset:
	/* disconnect and drain the queue before freeing the tagset */
	nvme_rdma_stop_queue(&ctrl->queues[0]);
	blk_mq_free_tag_set(&ctrl->admin_tag_set);
out_put_dev:
	nvme_rdma_dev_put(ctrl->device);
out_free_queue:
	nvme_rdma_free_queue(&ctrl->queues[0]);
	return error;
}

static void nvme_rdma_shutdown_ctrl(struct nvme_rdma_ctrl *ctrl)
{
	nvme_stop_keep_alive(&ctrl->ctrl);
	cancel_work_sync(&ctrl->err_work);
	cancel_delayed_work_sync(&ctrl->reconnect_work);

	if (ctrl->queue_count > 1) {
		nvme_stop_queues(&ctrl->ctrl);
		blk_mq_tagset_busy_iter(&ctrl->tag_set,
					nvme_cancel_request, &ctrl->ctrl);
		nvme_rdma_free_io_queues(ctrl);
	}

1663
	if (test_bit(NVME_RDMA_Q_CONNECTED, &ctrl->queues[0].flags))
1664 1665 1666 1667 1668 1669 1670 1671
		nvme_shutdown_ctrl(&ctrl->ctrl);

	blk_mq_stop_hw_queues(ctrl->ctrl.admin_q);
	blk_mq_tagset_busy_iter(&ctrl->admin_tag_set,
				nvme_cancel_request, &ctrl->ctrl);
	nvme_rdma_destroy_admin_queue(ctrl);
}

1672 1673 1674 1675 1676
static void __nvme_rdma_remove_ctrl(struct nvme_rdma_ctrl *ctrl, bool shutdown)
{
	nvme_uninit_ctrl(&ctrl->ctrl);
	if (shutdown)
		nvme_rdma_shutdown_ctrl(ctrl);
1677 1678 1679 1680 1681 1682 1683

	if (ctrl->ctrl.tagset) {
		blk_cleanup_queue(ctrl->ctrl.connect_q);
		blk_mq_free_tag_set(&ctrl->tag_set);
		nvme_rdma_dev_put(ctrl->device);
	}

1684 1685 1686
	nvme_put_ctrl(&ctrl->ctrl);
}

1687 1688 1689 1690 1691
static void nvme_rdma_del_ctrl_work(struct work_struct *work)
{
	struct nvme_rdma_ctrl *ctrl = container_of(work,
				struct nvme_rdma_ctrl, delete_work);

1692
	__nvme_rdma_remove_ctrl(ctrl, true);
1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708
}

static int __nvme_rdma_del_ctrl(struct nvme_rdma_ctrl *ctrl)
{
	if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_DELETING))
		return -EBUSY;

	if (!queue_work(nvme_rdma_wq, &ctrl->delete_work))
		return -EBUSY;

	return 0;
}

static int nvme_rdma_del_ctrl(struct nvme_ctrl *nctrl)
{
	struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(nctrl);
1709
	int ret = 0;
1710

1711 1712 1713 1714 1715 1716
	/*
	 * Keep a reference until all work is flushed since
	 * __nvme_rdma_del_ctrl can free the ctrl mem
	 */
	if (!kref_get_unless_zero(&ctrl->ctrl.kref))
		return -EBUSY;
1717
	ret = __nvme_rdma_del_ctrl(ctrl);
1718 1719 1720 1721
	if (!ret)
		flush_work(&ctrl->delete_work);
	nvme_put_ctrl(&ctrl->ctrl);
	return ret;
1722 1723 1724 1725 1726 1727 1728
}

static void nvme_rdma_remove_ctrl_work(struct work_struct *work)
{
	struct nvme_rdma_ctrl *ctrl = container_of(work,
				struct nvme_rdma_ctrl, delete_work);

1729
	__nvme_rdma_remove_ctrl(ctrl, false);
1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767
}

static void nvme_rdma_reset_ctrl_work(struct work_struct *work)
{
	struct nvme_rdma_ctrl *ctrl = container_of(work,
					struct nvme_rdma_ctrl, reset_work);
	int ret;
	bool changed;

	nvme_rdma_shutdown_ctrl(ctrl);

	ret = nvme_rdma_configure_admin_queue(ctrl);
	if (ret) {
		/* ctrl is already shutdown, just remove the ctrl */
		INIT_WORK(&ctrl->delete_work, nvme_rdma_remove_ctrl_work);
		goto del_dead_ctrl;
	}

	if (ctrl->queue_count > 1) {
		ret = blk_mq_reinit_tagset(&ctrl->tag_set);
		if (ret)
			goto del_dead_ctrl;

		ret = nvme_rdma_init_io_queues(ctrl);
		if (ret)
			goto del_dead_ctrl;

		ret = nvme_rdma_connect_io_queues(ctrl);
		if (ret)
			goto del_dead_ctrl;
	}

	changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE);
	WARN_ON_ONCE(!changed);

	if (ctrl->queue_count > 1) {
		nvme_start_queues(&ctrl->ctrl);
		nvme_queue_scan(&ctrl->ctrl);
1768
		nvme_queue_async_events(&ctrl->ctrl);
1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838
	}

	return;

del_dead_ctrl:
	/* Deleting this dead controller... */
	dev_warn(ctrl->ctrl.device, "Removing after reset failure\n");
	WARN_ON(!queue_work(nvme_rdma_wq, &ctrl->delete_work));
}

static int nvme_rdma_reset_ctrl(struct nvme_ctrl *nctrl)
{
	struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(nctrl);

	if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_RESETTING))
		return -EBUSY;

	if (!queue_work(nvme_rdma_wq, &ctrl->reset_work))
		return -EBUSY;

	flush_work(&ctrl->reset_work);

	return 0;
}

static const struct nvme_ctrl_ops nvme_rdma_ctrl_ops = {
	.name			= "rdma",
	.module			= THIS_MODULE,
	.is_fabrics		= true,
	.reg_read32		= nvmf_reg_read32,
	.reg_read64		= nvmf_reg_read64,
	.reg_write32		= nvmf_reg_write32,
	.reset_ctrl		= nvme_rdma_reset_ctrl,
	.free_ctrl		= nvme_rdma_free_ctrl,
	.submit_async_event	= nvme_rdma_submit_async_event,
	.delete_ctrl		= nvme_rdma_del_ctrl,
	.get_subsysnqn		= nvmf_get_subsysnqn,
	.get_address		= nvmf_get_address,
};

static int nvme_rdma_create_io_queues(struct nvme_rdma_ctrl *ctrl)
{
	struct nvmf_ctrl_options *opts = ctrl->ctrl.opts;
	int ret;

	ret = nvme_set_queue_count(&ctrl->ctrl, &opts->nr_io_queues);
	if (ret)
		return ret;

	ctrl->queue_count = opts->nr_io_queues + 1;
	if (ctrl->queue_count < 2)
		return 0;

	dev_info(ctrl->ctrl.device,
		"creating %d I/O queues.\n", opts->nr_io_queues);

	ret = nvme_rdma_init_io_queues(ctrl);
	if (ret)
		return ret;

	/*
	 * We need a reference on the device as long as the tag_set is alive,
	 * as the MRs in the request structures need a valid ib_device.
	 */
	ret = -EINVAL;
	if (!nvme_rdma_dev_get(ctrl->device))
		goto out_free_io_queues;

	memset(&ctrl->tag_set, 0, sizeof(ctrl->tag_set));
	ctrl->tag_set.ops = &nvme_rdma_mq_ops;
1839
	ctrl->tag_set.queue_depth = ctrl->ctrl.opts->queue_size;
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	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_rdma_request) +
		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;

	ret = blk_mq_alloc_tag_set(&ctrl->tag_set);
	if (ret)
		goto out_put_dev;
	ctrl->ctrl.tagset = &ctrl->tag_set;

	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_tag_set;
	}

	ret = nvme_rdma_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_tag_set:
	blk_mq_free_tag_set(&ctrl->tag_set);
out_put_dev:
	nvme_rdma_dev_put(ctrl->device);
out_free_io_queues:
	nvme_rdma_free_io_queues(ctrl);
	return ret;
}

static int nvme_rdma_parse_ipaddr(struct sockaddr_in *in_addr, char *p)
{
	u8 *addr = (u8 *)&in_addr->sin_addr.s_addr;
	size_t buflen = strlen(p);

	/* XXX: handle IPv6 addresses */

	if (buflen > INET_ADDRSTRLEN)
		return -EINVAL;
	if (in4_pton(p, buflen, addr, '\0', NULL) == 0)
		return -EINVAL;
	in_addr->sin_family = AF_INET;
	return 0;
}

static struct nvme_ctrl *nvme_rdma_create_ctrl(struct device *dev,
		struct nvmf_ctrl_options *opts)
{
	struct nvme_rdma_ctrl *ctrl;
	int ret;
	bool changed;

	ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
	if (!ctrl)
		return ERR_PTR(-ENOMEM);
	ctrl->ctrl.opts = opts;
	INIT_LIST_HEAD(&ctrl->list);

	ret = nvme_rdma_parse_ipaddr(&ctrl->addr_in, opts->traddr);
	if (ret) {
		pr_err("malformed IP address passed: %s\n", opts->traddr);
		goto out_free_ctrl;
	}

	if (opts->mask & NVMF_OPT_TRSVCID) {
		u16 port;

		ret = kstrtou16(opts->trsvcid, 0, &port);
		if (ret)
			goto out_free_ctrl;

		ctrl->addr_in.sin_port = cpu_to_be16(port);
	} else {
		ctrl->addr_in.sin_port = cpu_to_be16(NVME_RDMA_IP_PORT);
	}

	ret = nvme_init_ctrl(&ctrl->ctrl, dev, &nvme_rdma_ctrl_ops,
				0 /* no quirks, we're perfect! */);
	if (ret)
		goto out_free_ctrl;

	ctrl->reconnect_delay = opts->reconnect_delay;
	INIT_DELAYED_WORK(&ctrl->reconnect_work,
			nvme_rdma_reconnect_ctrl_work);
	INIT_WORK(&ctrl->err_work, nvme_rdma_error_recovery_work);
	INIT_WORK(&ctrl->delete_work, nvme_rdma_del_ctrl_work);
	INIT_WORK(&ctrl->reset_work, nvme_rdma_reset_ctrl_work);
	spin_lock_init(&ctrl->lock);

	ctrl->queue_count = opts->nr_io_queues + 1; /* +1 for admin queue */
1937
	ctrl->ctrl.sqsize = opts->queue_size - 1;
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	ctrl->ctrl.kato = opts->kato;

	ret = -ENOMEM;
	ctrl->queues = kcalloc(ctrl->queue_count, sizeof(*ctrl->queues),
				GFP_KERNEL);
	if (!ctrl->queues)
		goto out_uninit_ctrl;

	ret = nvme_rdma_configure_admin_queue(ctrl);
	if (ret)
		goto out_kfree_queues;

	/* sanity check icdoff */
	if (ctrl->ctrl.icdoff) {
		dev_err(ctrl->ctrl.device, "icdoff is not supported!\n");
		goto out_remove_admin_queue;
	}

	/* sanity check keyed sgls */
	if (!(ctrl->ctrl.sgls & (1 << 20))) {
		dev_err(ctrl->ctrl.device, "Mandatory keyed sgls are not support\n");
		goto out_remove_admin_queue;
	}

	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;
	}

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	if (opts->queue_size > ctrl->ctrl.sqsize + 1) {
		/* warn if sqsize is lower than queue_size */
		dev_warn(ctrl->ctrl.device,
			"queue_size %zu > ctrl sqsize %u, clamping down\n",
			opts->queue_size, ctrl->ctrl.sqsize + 1);
		opts->queue_size = ctrl->ctrl.sqsize + 1;
	}

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	if (opts->nr_io_queues) {
		ret = nvme_rdma_create_io_queues(ctrl);
		if (ret)
			goto out_remove_admin_queue;
	}

	changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE);
	WARN_ON_ONCE(!changed);

	dev_info(ctrl->ctrl.device, "new ctrl: NQN \"%s\", addr %pISp\n",
		ctrl->ctrl.opts->subsysnqn, &ctrl->addr);

	kref_get(&ctrl->ctrl.kref);

	mutex_lock(&nvme_rdma_ctrl_mutex);
	list_add_tail(&ctrl->list, &nvme_rdma_ctrl_list);
	mutex_unlock(&nvme_rdma_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_stop_keep_alive(&ctrl->ctrl);
	nvme_rdma_destroy_admin_queue(ctrl);
out_kfree_queues:
	kfree(ctrl->queues);
out_uninit_ctrl:
	nvme_uninit_ctrl(&ctrl->ctrl);
	nvme_put_ctrl(&ctrl->ctrl);
	if (ret > 0)
		ret = -EIO;
	return ERR_PTR(ret);
out_free_ctrl:
	kfree(ctrl);
	return ERR_PTR(ret);
}

static struct nvmf_transport_ops nvme_rdma_transport = {
	.name		= "rdma",
	.required_opts	= NVMF_OPT_TRADDR,
2022
	.allowed_opts	= NVMF_OPT_TRSVCID | NVMF_OPT_RECONNECT_DELAY,
2023 2024 2025
	.create_ctrl	= nvme_rdma_create_ctrl,
};

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static void nvme_rdma_add_one(struct ib_device *ib_device)
{
}

static void nvme_rdma_remove_one(struct ib_device *ib_device, void *client_data)
{
	struct nvme_rdma_ctrl *ctrl;

	/* Delete all controllers using this device */
	mutex_lock(&nvme_rdma_ctrl_mutex);
	list_for_each_entry(ctrl, &nvme_rdma_ctrl_list, list) {
		if (ctrl->device->dev != ib_device)
			continue;
		dev_info(ctrl->ctrl.device,
			"Removing ctrl: NQN \"%s\", addr %pISp\n",
			ctrl->ctrl.opts->subsysnqn, &ctrl->addr);
		__nvme_rdma_del_ctrl(ctrl);
	}
	mutex_unlock(&nvme_rdma_ctrl_mutex);

	flush_workqueue(nvme_rdma_wq);
}

static struct ib_client nvme_rdma_ib_client = {
	.name   = "nvme_rdma",
	.add = nvme_rdma_add_one,
	.remove = nvme_rdma_remove_one
};

2055 2056
static int __init nvme_rdma_init_module(void)
{
2057 2058
	int ret;

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	nvme_rdma_wq = create_workqueue("nvme_rdma_wq");
	if (!nvme_rdma_wq)
		return -ENOMEM;

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	ret = ib_register_client(&nvme_rdma_ib_client);
	if (ret) {
		destroy_workqueue(nvme_rdma_wq);
		return ret;
	}

2069 2070 2071 2072 2073 2074 2075
	nvmf_register_transport(&nvme_rdma_transport);
	return 0;
}

static void __exit nvme_rdma_cleanup_module(void)
{
	nvmf_unregister_transport(&nvme_rdma_transport);
2076
	ib_unregister_client(&nvme_rdma_ib_client);
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	destroy_workqueue(nvme_rdma_wq);
}

module_init(nvme_rdma_init_module);
module_exit(nvme_rdma_cleanup_module);

MODULE_LICENSE("GPL v2");