v4.19.13 snapshot.
diff --git a/drivers/nvme/host/rdma.c b/drivers/nvme/host/rdma.c
new file mode 100644
index 0000000..b6a28de
--- /dev/null
+++ b/drivers/nvme/host/rdma.c
@@ -0,0 +1,2095 @@
+/*
+ * 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 <rdma/mr_pool.h>
+#include <linux/err.h>
+#include <linux/string.h>
+#include <linux/atomic.h>
+#include <linux/blk-mq.h>
+#include <linux/blk-mq-rdma.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 3000 /* 3 second */
+
+#define NVME_RDMA_MAX_SEGMENTS 256
+
+#define NVME_RDMA_MAX_INLINE_SEGMENTS 4
+
+struct nvme_rdma_device {
+ struct ib_device *dev;
+ struct ib_pd *pd;
+ struct kref ref;
+ struct list_head entry;
+ unsigned int num_inline_segments;
+};
+
+struct nvme_rdma_qe {
+ struct ib_cqe cqe;
+ void *data;
+ u64 dma;
+};
+
+struct nvme_rdma_queue;
+struct nvme_rdma_request {
+ struct nvme_request req;
+ struct ib_mr *mr;
+ struct nvme_rdma_qe sqe;
+ union nvme_result result;
+ __le16 status;
+ refcount_t ref;
+ struct ib_sge sge[1 + NVME_RDMA_MAX_INLINE_SEGMENTS];
+ u32 num_sge;
+ int nents;
+ 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_ALLOCATED = 0,
+ NVME_RDMA_Q_LIVE = 1,
+ NVME_RDMA_Q_TR_READY = 2,
+};
+
+struct nvme_rdma_queue {
+ struct nvme_rdma_qe *rsp_ring;
+ 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 only in the hot path */
+ struct nvme_rdma_queue *queues;
+
+ /* other member variables */
+ struct blk_mq_tag_set tag_set;
+ struct work_struct err_work;
+
+ struct nvme_rdma_qe async_event_sqe;
+
+ struct delayed_work reconnect_work;
+
+ struct list_head list;
+
+ struct blk_mq_tag_set admin_tag_set;
+ struct nvme_rdma_device *device;
+
+ u32 max_fr_pages;
+
+ struct sockaddr_storage addr;
+ struct sockaddr_storage src_addr;
+
+ struct nvme_ctrl ctrl;
+ bool use_inline_data;
+};
+
+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);
+
+/*
+ * 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);
+
+static const struct blk_mq_ops nvme_rdma_mq_ops;
+static const struct blk_mq_ops nvme_rdma_admin_mq_ops;
+
+/* 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);
+ qe->data = NULL;
+ 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)
+{
+ pr_debug("QP event %s (%d)\n",
+ ib_event_msg(event->event), event->event);
+
+}
+
+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 + dev->num_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 void nvme_rdma_exit_request(struct blk_mq_tag_set *set,
+ struct request *rq, unsigned int hctx_idx)
+{
+ struct nvme_rdma_ctrl *ctrl = set->driver_data;
+ struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
+ int queue_idx = (set == &ctrl->tag_set) ? hctx_idx + 1 : 0;
+ struct nvme_rdma_queue *queue = &ctrl->queues[queue_idx];
+ struct nvme_rdma_device *dev = queue->device;
+
+ nvme_rdma_free_qe(dev->dev, &req->sqe, sizeof(struct nvme_command),
+ DMA_TO_DEVICE);
+}
+
+static int nvme_rdma_init_request(struct blk_mq_tag_set *set,
+ struct request *rq, unsigned int hctx_idx,
+ unsigned int numa_node)
+{
+ struct nvme_rdma_ctrl *ctrl = set->driver_data;
+ struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
+ int queue_idx = (set == &ctrl->tag_set) ? hctx_idx + 1 : 0;
+ struct nvme_rdma_queue *queue = &ctrl->queues[queue_idx];
+ struct nvme_rdma_device *dev = queue->device;
+ struct ib_device *ibdev = dev->dev;
+ int ret;
+
+ nvme_req(rq)->ctrl = &ctrl->ctrl;
+ ret = nvme_rdma_alloc_qe(ibdev, &req->sqe, sizeof(struct nvme_command),
+ DMA_TO_DEVICE);
+ if (ret)
+ return ret;
+
+ req->queue = queue;
+
+ return 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->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);
+
+ ndev->pd = ib_alloc_pd(ndev->dev,
+ register_always ? 0 : IB_PD_UNSAFE_GLOBAL_RKEY);
+ 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");
+ goto out_free_pd;
+ }
+
+ ndev->num_inline_segments = min(NVME_RDMA_MAX_INLINE_SEGMENTS,
+ ndev->dev->attrs.max_send_sge - 1);
+ 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)
+{
+ struct nvme_rdma_device *dev;
+ struct ib_device *ibdev;
+
+ if (!test_and_clear_bit(NVME_RDMA_Q_TR_READY, &queue->flags))
+ return;
+
+ dev = queue->device;
+ ibdev = dev->dev;
+
+ ib_mr_pool_destroy(queue->qp, &queue->qp->rdma_mrs);
+
+ /*
+ * The cm_id object might have been destroyed during RDMA connection
+ * establishment error flow to avoid getting other cma events, thus
+ * the destruction of the QP shouldn't use rdma_cm API.
+ */
+ ib_destroy_qp(queue->qp);
+ 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_get_max_fr_pages(struct ib_device *ibdev)
+{
+ return min_t(u32, NVME_RDMA_MAX_SEGMENTS,
+ ibdev->attrs.max_fast_reg_page_list_len);
+}
+
+static int nvme_rdma_create_queue_ib(struct nvme_rdma_queue *queue)
+{
+ struct ib_device *ibdev;
+ 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 = nvme_rdma_find_get_device(queue->cm_id);
+ if (!queue->device) {
+ dev_err(queue->cm_id->device->dev.parent,
+ "no client data found!\n");
+ return -ECONNREFUSED;
+ }
+ ibdev = queue->device->dev;
+
+ /*
+ * Spread I/O queues completion vectors according their queue index.
+ * Admin queues can always go on completion vector 0.
+ */
+ comp_vector = idx == 0 ? idx : idx - 1;
+
+ /* +1 for ib_stop_cq */
+ queue->ib_cq = ib_alloc_cq(ibdev, 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_put_dev;
+ }
+
+ 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;
+ }
+
+ ret = ib_mr_pool_init(queue->qp, &queue->qp->rdma_mrs,
+ queue->queue_size,
+ IB_MR_TYPE_MEM_REG,
+ nvme_rdma_get_max_fr_pages(ibdev));
+ if (ret) {
+ dev_err(queue->ctrl->ctrl.device,
+ "failed to initialize MR pool sized %d for QID %d\n",
+ queue->queue_size, idx);
+ goto out_destroy_ring;
+ }
+
+ set_bit(NVME_RDMA_Q_TR_READY, &queue->flags);
+
+ return 0;
+
+out_destroy_ring:
+ nvme_rdma_free_ring(ibdev, queue->rsp_ring, queue->queue_size,
+ sizeof(struct nvme_completion), DMA_FROM_DEVICE);
+out_destroy_qp:
+ rdma_destroy_qp(queue->cm_id);
+out_destroy_ib_cq:
+ ib_free_cq(queue->ib_cq);
+out_put_dev:
+ nvme_rdma_dev_put(queue->device);
+ return ret;
+}
+
+static int nvme_rdma_alloc_queue(struct nvme_rdma_ctrl *ctrl,
+ int idx, size_t queue_size)
+{
+ struct nvme_rdma_queue *queue;
+ struct sockaddr *src_addr = NULL;
+ 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);
+ }
+
+ if (ctrl->ctrl.opts->mask & NVMF_OPT_HOST_TRADDR)
+ src_addr = (struct sockaddr *)&ctrl->src_addr;
+
+ queue->cm_error = -ETIMEDOUT;
+ ret = rdma_resolve_addr(queue->cm_id, src_addr,
+ (struct sockaddr *)&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 connection establishment failed (%d)\n", ret);
+ goto out_destroy_cm_id;
+ }
+
+ set_bit(NVME_RDMA_Q_ALLOCATED, &queue->flags);
+
+ return 0;
+
+out_destroy_cm_id:
+ rdma_destroy_id(queue->cm_id);
+ nvme_rdma_destroy_queue_ib(queue);
+ return ret;
+}
+
+static void nvme_rdma_stop_queue(struct nvme_rdma_queue *queue)
+{
+ if (!test_and_clear_bit(NVME_RDMA_Q_LIVE, &queue->flags))
+ return;
+
+ rdma_disconnect(queue->cm_id);
+ ib_drain_qp(queue->qp);
+}
+
+static void nvme_rdma_free_queue(struct nvme_rdma_queue *queue)
+{
+ if (!test_and_clear_bit(NVME_RDMA_Q_ALLOCATED, &queue->flags))
+ return;
+
+ nvme_rdma_destroy_queue_ib(queue);
+ rdma_destroy_id(queue->cm_id);
+}
+
+static void nvme_rdma_free_io_queues(struct nvme_rdma_ctrl *ctrl)
+{
+ int i;
+
+ for (i = 1; i < ctrl->ctrl.queue_count; i++)
+ nvme_rdma_free_queue(&ctrl->queues[i]);
+}
+
+static void nvme_rdma_stop_io_queues(struct nvme_rdma_ctrl *ctrl)
+{
+ int i;
+
+ for (i = 1; i < ctrl->ctrl.queue_count; i++)
+ nvme_rdma_stop_queue(&ctrl->queues[i]);
+}
+
+static int nvme_rdma_start_queue(struct nvme_rdma_ctrl *ctrl, int idx)
+{
+ int ret;
+
+ if (idx)
+ ret = nvmf_connect_io_queue(&ctrl->ctrl, idx);
+ else
+ ret = nvmf_connect_admin_queue(&ctrl->ctrl);
+
+ if (!ret)
+ set_bit(NVME_RDMA_Q_LIVE, &ctrl->queues[idx].flags);
+ else
+ dev_info(ctrl->ctrl.device,
+ "failed to connect queue: %d ret=%d\n", idx, ret);
+ return ret;
+}
+
+static int nvme_rdma_start_io_queues(struct nvme_rdma_ctrl *ctrl)
+{
+ int i, ret = 0;
+
+ for (i = 1; i < ctrl->ctrl.queue_count; i++) {
+ ret = nvme_rdma_start_queue(ctrl, i);
+ if (ret)
+ goto out_stop_queues;
+ }
+
+ return 0;
+
+out_stop_queues:
+ for (i--; i >= 1; i--)
+ nvme_rdma_stop_queue(&ctrl->queues[i]);
+ return ret;
+}
+
+static int nvme_rdma_alloc_io_queues(struct nvme_rdma_ctrl *ctrl)
+{
+ struct nvmf_ctrl_options *opts = ctrl->ctrl.opts;
+ struct ib_device *ibdev = ctrl->device->dev;
+ unsigned int nr_io_queues;
+ int i, ret;
+
+ nr_io_queues = min(opts->nr_io_queues, num_online_cpus());
+
+ /*
+ * we map queues according to the device irq vectors for
+ * optimal locality so we don't need more queues than
+ * completion vectors.
+ */
+ nr_io_queues = min_t(unsigned int, nr_io_queues,
+ ibdev->num_comp_vectors);
+
+ ret = nvme_set_queue_count(&ctrl->ctrl, &nr_io_queues);
+ if (ret)
+ return ret;
+
+ ctrl->ctrl.queue_count = nr_io_queues + 1;
+ if (ctrl->ctrl.queue_count < 2)
+ return 0;
+
+ dev_info(ctrl->ctrl.device,
+ "creating %d I/O queues.\n", nr_io_queues);
+
+ for (i = 1; i < ctrl->ctrl.queue_count; i++) {
+ ret = nvme_rdma_alloc_queue(ctrl, i,
+ ctrl->ctrl.sqsize + 1);
+ if (ret)
+ goto out_free_queues;
+ }
+
+ return 0;
+
+out_free_queues:
+ for (i--; i >= 1; i--)
+ nvme_rdma_free_queue(&ctrl->queues[i]);
+
+ return ret;
+}
+
+static void nvme_rdma_free_tagset(struct nvme_ctrl *nctrl,
+ struct blk_mq_tag_set *set)
+{
+ struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(nctrl);
+
+ blk_mq_free_tag_set(set);
+ nvme_rdma_dev_put(ctrl->device);
+}
+
+static struct blk_mq_tag_set *nvme_rdma_alloc_tagset(struct nvme_ctrl *nctrl,
+ bool admin)
+{
+ struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(nctrl);
+ struct blk_mq_tag_set *set;
+ int ret;
+
+ if (admin) {
+ set = &ctrl->admin_tag_set;
+ memset(set, 0, sizeof(*set));
+ set->ops = &nvme_rdma_admin_mq_ops;
+ set->queue_depth = NVME_AQ_MQ_TAG_DEPTH;
+ set->reserved_tags = 2; /* connect + keep-alive */
+ set->numa_node = NUMA_NO_NODE;
+ set->cmd_size = sizeof(struct nvme_rdma_request) +
+ SG_CHUNK_SIZE * sizeof(struct scatterlist);
+ set->driver_data = ctrl;
+ set->nr_hw_queues = 1;
+ set->timeout = ADMIN_TIMEOUT;
+ set->flags = BLK_MQ_F_NO_SCHED;
+ } else {
+ set = &ctrl->tag_set;
+ memset(set, 0, sizeof(*set));
+ set->ops = &nvme_rdma_mq_ops;
+ set->queue_depth = nctrl->sqsize + 1;
+ set->reserved_tags = 1; /* fabric connect */
+ set->numa_node = NUMA_NO_NODE;
+ set->flags = BLK_MQ_F_SHOULD_MERGE;
+ set->cmd_size = sizeof(struct nvme_rdma_request) +
+ SG_CHUNK_SIZE * sizeof(struct scatterlist);
+ set->driver_data = ctrl;
+ set->nr_hw_queues = nctrl->queue_count - 1;
+ set->timeout = NVME_IO_TIMEOUT;
+ }
+
+ ret = blk_mq_alloc_tag_set(set);
+ if (ret)
+ goto out;
+
+ /*
+ * 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 = nvme_rdma_dev_get(ctrl->device);
+ if (!ret) {
+ ret = -EINVAL;
+ goto out_free_tagset;
+ }
+
+ return set;
+
+out_free_tagset:
+ blk_mq_free_tag_set(set);
+out:
+ return ERR_PTR(ret);
+}
+
+static void nvme_rdma_destroy_admin_queue(struct nvme_rdma_ctrl *ctrl,
+ bool remove)
+{
+ if (remove) {
+ blk_cleanup_queue(ctrl->ctrl.admin_q);
+ nvme_rdma_free_tagset(&ctrl->ctrl, ctrl->ctrl.admin_tagset);
+ }
+ if (ctrl->async_event_sqe.data) {
+ nvme_rdma_free_qe(ctrl->device->dev, &ctrl->async_event_sqe,
+ sizeof(struct nvme_command), DMA_TO_DEVICE);
+ ctrl->async_event_sqe.data = NULL;
+ }
+ nvme_rdma_free_queue(&ctrl->queues[0]);
+}
+
+static int nvme_rdma_configure_admin_queue(struct nvme_rdma_ctrl *ctrl,
+ bool new)
+{
+ int error;
+
+ error = nvme_rdma_alloc_queue(ctrl, 0, NVME_AQ_DEPTH);
+ if (error)
+ return error;
+
+ ctrl->device = ctrl->queues[0].device;
+
+ ctrl->max_fr_pages = nvme_rdma_get_max_fr_pages(ctrl->device->dev);
+
+ error = nvme_rdma_alloc_qe(ctrl->device->dev, &ctrl->async_event_sqe,
+ sizeof(struct nvme_command), DMA_TO_DEVICE);
+ if (error)
+ goto out_free_queue;
+
+ if (new) {
+ ctrl->ctrl.admin_tagset = nvme_rdma_alloc_tagset(&ctrl->ctrl, true);
+ if (IS_ERR(ctrl->ctrl.admin_tagset)) {
+ error = PTR_ERR(ctrl->ctrl.admin_tagset);
+ goto out_free_async_qe;
+ }
+
+ 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 = nvme_rdma_start_queue(ctrl, 0);
+ if (error)
+ goto out_cleanup_queue;
+
+ error = ctrl->ctrl.ops->reg_read64(&ctrl->ctrl, NVME_REG_CAP,
+ &ctrl->ctrl.cap);
+ if (error) {
+ dev_err(ctrl->ctrl.device,
+ "prop_get NVME_REG_CAP failed\n");
+ goto out_stop_queue;
+ }
+
+ ctrl->ctrl.sqsize =
+ min_t(int, NVME_CAP_MQES(ctrl->ctrl.cap), ctrl->ctrl.sqsize);
+
+ error = nvme_enable_ctrl(&ctrl->ctrl, ctrl->ctrl.cap);
+ if (error)
+ goto out_stop_queue;
+
+ ctrl->ctrl.max_hw_sectors =
+ (ctrl->max_fr_pages - 1) << (ilog2(SZ_4K) - 9);
+
+ error = nvme_init_identify(&ctrl->ctrl);
+ if (error)
+ goto out_stop_queue;
+
+ return 0;
+
+out_stop_queue:
+ nvme_rdma_stop_queue(&ctrl->queues[0]);
+out_cleanup_queue:
+ if (new)
+ blk_cleanup_queue(ctrl->ctrl.admin_q);
+out_free_tagset:
+ if (new)
+ nvme_rdma_free_tagset(&ctrl->ctrl, ctrl->ctrl.admin_tagset);
+out_free_async_qe:
+ nvme_rdma_free_qe(ctrl->device->dev, &ctrl->async_event_sqe,
+ sizeof(struct nvme_command), DMA_TO_DEVICE);
+ ctrl->async_event_sqe.data = NULL;
+out_free_queue:
+ nvme_rdma_free_queue(&ctrl->queues[0]);
+ return error;
+}
+
+static void nvme_rdma_destroy_io_queues(struct nvme_rdma_ctrl *ctrl,
+ bool remove)
+{
+ if (remove) {
+ blk_cleanup_queue(ctrl->ctrl.connect_q);
+ nvme_rdma_free_tagset(&ctrl->ctrl, ctrl->ctrl.tagset);
+ }
+ nvme_rdma_free_io_queues(ctrl);
+}
+
+static int nvme_rdma_configure_io_queues(struct nvme_rdma_ctrl *ctrl, bool new)
+{
+ int ret;
+
+ ret = nvme_rdma_alloc_io_queues(ctrl);
+ if (ret)
+ return ret;
+
+ if (new) {
+ ctrl->ctrl.tagset = nvme_rdma_alloc_tagset(&ctrl->ctrl, false);
+ if (IS_ERR(ctrl->ctrl.tagset)) {
+ ret = PTR_ERR(ctrl->ctrl.tagset);
+ goto out_free_io_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_tag_set;
+ }
+ } else {
+ blk_mq_update_nr_hw_queues(&ctrl->tag_set,
+ ctrl->ctrl.queue_count - 1);
+ }
+
+ ret = nvme_rdma_start_io_queues(ctrl);
+ if (ret)
+ goto out_cleanup_connect_q;
+
+ return 0;
+
+out_cleanup_connect_q:
+ if (new)
+ blk_cleanup_queue(ctrl->ctrl.connect_q);
+out_free_tag_set:
+ if (new)
+ nvme_rdma_free_tagset(&ctrl->ctrl, ctrl->ctrl.tagset);
+out_free_io_queues:
+ nvme_rdma_free_io_queues(ctrl);
+ return ret;
+}
+
+static void nvme_rdma_teardown_admin_queue(struct nvme_rdma_ctrl *ctrl,
+ bool remove)
+{
+ blk_mq_quiesce_queue(ctrl->ctrl.admin_q);
+ nvme_rdma_stop_queue(&ctrl->queues[0]);
+ blk_mq_tagset_busy_iter(&ctrl->admin_tag_set, nvme_cancel_request,
+ &ctrl->ctrl);
+ blk_mq_unquiesce_queue(ctrl->ctrl.admin_q);
+ nvme_rdma_destroy_admin_queue(ctrl, remove);
+}
+
+static void nvme_rdma_teardown_io_queues(struct nvme_rdma_ctrl *ctrl,
+ bool remove)
+{
+ if (ctrl->ctrl.queue_count > 1) {
+ nvme_stop_queues(&ctrl->ctrl);
+ nvme_rdma_stop_io_queues(ctrl);
+ blk_mq_tagset_busy_iter(&ctrl->tag_set, nvme_cancel_request,
+ &ctrl->ctrl);
+ if (remove)
+ nvme_start_queues(&ctrl->ctrl);
+ nvme_rdma_destroy_io_queues(ctrl, remove);
+ }
+}
+
+static void nvme_rdma_stop_ctrl(struct nvme_ctrl *nctrl)
+{
+ struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(nctrl);
+
+ cancel_work_sync(&ctrl->err_work);
+ cancel_delayed_work_sync(&ctrl->reconnect_work);
+}
+
+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);
+
+ nvmf_free_options(nctrl->opts);
+free_ctrl:
+ kfree(ctrl->queues);
+ kfree(ctrl);
+}
+
+static void nvme_rdma_reconnect_or_remove(struct nvme_rdma_ctrl *ctrl)
+{
+ /* If we are resetting/deleting then do nothing */
+ if (ctrl->ctrl.state != NVME_CTRL_CONNECTING) {
+ WARN_ON_ONCE(ctrl->ctrl.state == NVME_CTRL_NEW ||
+ ctrl->ctrl.state == NVME_CTRL_LIVE);
+ return;
+ }
+
+ if (nvmf_should_reconnect(&ctrl->ctrl)) {
+ dev_info(ctrl->ctrl.device, "Reconnecting in %d seconds...\n",
+ ctrl->ctrl.opts->reconnect_delay);
+ queue_delayed_work(nvme_wq, &ctrl->reconnect_work,
+ ctrl->ctrl.opts->reconnect_delay * HZ);
+ } else {
+ nvme_delete_ctrl(&ctrl->ctrl);
+ }
+}
+
+static int nvme_rdma_setup_ctrl(struct nvme_rdma_ctrl *ctrl, bool new)
+{
+ int ret = -EINVAL;
+ bool changed;
+
+ ret = nvme_rdma_configure_admin_queue(ctrl, new);
+ if (ret)
+ return ret;
+
+ if (ctrl->ctrl.icdoff) {
+ dev_err(ctrl->ctrl.device, "icdoff is not supported!\n");
+ goto destroy_admin;
+ }
+
+ if (!(ctrl->ctrl.sgls & (1 << 2))) {
+ dev_err(ctrl->ctrl.device,
+ "Mandatory keyed sgls are not supported!\n");
+ goto destroy_admin;
+ }
+
+ if (ctrl->ctrl.opts->queue_size > ctrl->ctrl.sqsize + 1) {
+ dev_warn(ctrl->ctrl.device,
+ "queue_size %zu > ctrl sqsize %u, clamping down\n",
+ ctrl->ctrl.opts->queue_size, ctrl->ctrl.sqsize + 1);
+ }
+
+ if (ctrl->ctrl.sqsize + 1 > ctrl->ctrl.maxcmd) {
+ dev_warn(ctrl->ctrl.device,
+ "sqsize %u > ctrl maxcmd %u, clamping down\n",
+ ctrl->ctrl.sqsize + 1, ctrl->ctrl.maxcmd);
+ ctrl->ctrl.sqsize = ctrl->ctrl.maxcmd - 1;
+ }
+
+ if (ctrl->ctrl.sgls & (1 << 20))
+ ctrl->use_inline_data = true;
+
+ if (ctrl->ctrl.queue_count > 1) {
+ ret = nvme_rdma_configure_io_queues(ctrl, new);
+ if (ret)
+ goto destroy_admin;
+ }
+
+ changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE);
+ if (!changed) {
+ /* state change failure is ok if we're in DELETING state */
+ WARN_ON_ONCE(ctrl->ctrl.state != NVME_CTRL_DELETING);
+ ret = -EINVAL;
+ goto destroy_io;
+ }
+
+ nvme_start_ctrl(&ctrl->ctrl);
+ return 0;
+
+destroy_io:
+ if (ctrl->ctrl.queue_count > 1)
+ nvme_rdma_destroy_io_queues(ctrl, new);
+destroy_admin:
+ nvme_rdma_stop_queue(&ctrl->queues[0]);
+ nvme_rdma_destroy_admin_queue(ctrl, new);
+ return ret;
+}
+
+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);
+
+ ++ctrl->ctrl.nr_reconnects;
+
+ if (nvme_rdma_setup_ctrl(ctrl, false))
+ goto requeue;
+
+ dev_info(ctrl->ctrl.device, "Successfully reconnected (%d attempts)\n",
+ ctrl->ctrl.nr_reconnects);
+
+ ctrl->ctrl.nr_reconnects = 0;
+
+ return;
+
+requeue:
+ dev_info(ctrl->ctrl.device, "Failed reconnect attempt %d\n",
+ ctrl->ctrl.nr_reconnects);
+ nvme_rdma_reconnect_or_remove(ctrl);
+}
+
+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);
+
+ nvme_stop_keep_alive(&ctrl->ctrl);
+ nvme_rdma_teardown_io_queues(ctrl, false);
+ nvme_start_queues(&ctrl->ctrl);
+ nvme_rdma_teardown_admin_queue(ctrl, false);
+
+ if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_CONNECTING)) {
+ /* state change failure is ok if we're in DELETING state */
+ WARN_ON_ONCE(ctrl->ctrl.state != NVME_CTRL_DELETING);
+ return;
+ }
+
+ nvme_rdma_reconnect_or_remove(ctrl);
+}
+
+static void nvme_rdma_error_recovery(struct nvme_rdma_ctrl *ctrl)
+{
+ if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_RESETTING))
+ return;
+
+ queue_work(nvme_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)
+{
+ struct nvme_rdma_request *req =
+ container_of(wc->wr_cqe, struct nvme_rdma_request, reg_cqe);
+ struct request *rq = blk_mq_rq_from_pdu(req);
+
+ if (unlikely(wc->status != IB_WC_SUCCESS)) {
+ nvme_rdma_wr_error(cq, wc, "LOCAL_INV");
+ return;
+ }
+
+ if (refcount_dec_and_test(&req->ref))
+ nvme_end_request(rq, req->status, req->result);
+
+}
+
+static int nvme_rdma_inv_rkey(struct nvme_rdma_queue *queue,
+ struct nvme_rdma_request *req)
+{
+ struct ib_send_wr wr = {
+ .opcode = IB_WR_LOCAL_INV,
+ .next = NULL,
+ .num_sge = 0,
+ .send_flags = IB_SEND_SIGNALED,
+ .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, NULL);
+}
+
+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_device *dev = queue->device;
+ struct ib_device *ibdev = dev->dev;
+
+ if (!blk_rq_payload_bytes(rq))
+ return;
+
+ if (req->mr) {
+ ib_mr_pool_put(queue->qp, &queue->qp->rdma_mrs, req->mr);
+ req->mr = NULL;
+ }
+
+ 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,
+ int count)
+{
+ struct nvme_sgl_desc *sg = &c->common.dptr.sgl;
+ struct scatterlist *sgl = req->sg_table.sgl;
+ struct ib_sge *sge = &req->sge[1];
+ u32 len = 0;
+ int i;
+
+ for (i = 0; i < count; i++, sgl++, sge++) {
+ sge->addr = sg_dma_address(sgl);
+ sge->length = sg_dma_len(sgl);
+ sge->lkey = queue->device->pd->local_dma_lkey;
+ len += sge->length;
+ }
+
+ sg->addr = cpu_to_le64(queue->ctrl->ctrl.icdoff);
+ sg->length = cpu_to_le32(len);
+ sg->type = (NVME_SGL_FMT_DATA_DESC << 4) | NVME_SGL_FMT_OFFSET;
+
+ req->num_sge += count;
+ 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);
+ put_unaligned_le32(queue->device->pd->unsafe_global_rkey, sg->key);
+ 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;
+
+ req->mr = ib_mr_pool_get(queue->qp, &queue->qp->rdma_mrs);
+ if (WARN_ON_ONCE(!req->mr))
+ return -EAGAIN;
+
+ /*
+ * Align the MR to a 4K page size to match the ctrl page size and
+ * the block virtual boundary.
+ */
+ nr = ib_map_mr_sg(req->mr, req->sg_table.sgl, count, NULL, SZ_4K);
+ if (unlikely(nr < count)) {
+ ib_mr_pool_put(queue->qp, &queue->qp->rdma_mrs, req->mr);
+ req->mr = NULL;
+ 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;
+
+ 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, 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;
+ int count, ret;
+
+ req->num_sge = 1;
+ refcount_set(&req->ref, 2); /* send and recv completions */
+
+ c->common.flags |= NVME_CMD_SGL_METABUF;
+
+ if (!blk_rq_payload_bytes(rq))
+ return nvme_rdma_set_sg_null(c);
+
+ req->sg_table.sgl = req->first_sgl;
+ ret = sg_alloc_table_chained(&req->sg_table,
+ blk_rq_nr_phys_segments(rq), req->sg_table.sgl);
+ if (ret)
+ return -ENOMEM;
+
+ req->nents = blk_rq_map_sg(rq->q, rq, req->sg_table.sgl);
+
+ count = ib_dma_map_sg(ibdev, req->sg_table.sgl, req->nents,
+ rq_data_dir(rq) == WRITE ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
+ if (unlikely(count <= 0)) {
+ ret = -EIO;
+ goto out_free_table;
+ }
+
+ if (count <= dev->num_inline_segments) {
+ if (rq_data_dir(rq) == WRITE && nvme_rdma_queue_idx(queue) &&
+ queue->ctrl->use_inline_data &&
+ blk_rq_payload_bytes(rq) <=
+ nvme_rdma_inline_data_size(queue)) {
+ ret = nvme_rdma_map_sg_inline(queue, req, c, count);
+ goto out;
+ }
+
+ if (count == 1 && dev->pd->flags & IB_PD_UNSAFE_GLOBAL_RKEY) {
+ ret = nvme_rdma_map_sg_single(queue, req, c);
+ goto out;
+ }
+ }
+
+ ret = nvme_rdma_map_sg_fr(queue, req, c, count);
+out:
+ if (unlikely(ret))
+ goto out_unmap_sg;
+
+ return 0;
+
+out_unmap_sg:
+ ib_dma_unmap_sg(ibdev, req->sg_table.sgl,
+ req->nents, rq_data_dir(rq) ==
+ WRITE ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
+out_free_table:
+ sg_free_table_chained(&req->sg_table, true);
+ return ret;
+}
+
+static void nvme_rdma_send_done(struct ib_cq *cq, struct ib_wc *wc)
+{
+ struct nvme_rdma_qe *qe =
+ container_of(wc->wr_cqe, struct nvme_rdma_qe, cqe);
+ struct nvme_rdma_request *req =
+ container_of(qe, struct nvme_rdma_request, sqe);
+ struct request *rq = blk_mq_rq_from_pdu(req);
+
+ if (unlikely(wc->status != IB_WC_SUCCESS)) {
+ nvme_rdma_wr_error(cq, wc, "SEND");
+ return;
+ }
+
+ if (refcount_dec_and_test(&req->ref))
+ nvme_end_request(rq, req->status, req->result);
+}
+
+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)
+{
+ struct ib_send_wr wr;
+ int ret;
+
+ sge->addr = qe->dma;
+ sge->length = sizeof(struct nvme_command),
+ sge->lkey = queue->device->pd->local_dma_lkey;
+
+ 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 = IB_SEND_SIGNALED;
+
+ if (first)
+ first->next = ≀
+ else
+ first = ≀
+
+ ret = ib_post_send(queue->qp, first, NULL);
+ if (unlikely(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;
+ 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, NULL);
+ if (unlikely(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_async_done(struct ib_cq *cq, struct ib_wc *wc)
+{
+ if (unlikely(wc->status != IB_WC_SUCCESS))
+ nvme_rdma_wr_error(cq, wc, "ASYNC");
+}
+
+static void nvme_rdma_submit_async_event(struct nvme_ctrl *arg)
+{
+ 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;
+
+ 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_AQ_BLK_MQ_DEPTH;
+ cmd->common.flags |= NVME_CMD_SGL_METABUF;
+ nvme_rdma_set_sg_null(cmd);
+
+ sqe->cqe.done = nvme_rdma_async_done;
+
+ ib_dma_sync_single_for_device(dev, sqe->dma, sizeof(*cmd),
+ DMA_TO_DEVICE);
+
+ ret = nvme_rdma_post_send(queue, sqe, &sge, 1, NULL);
+ 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);
+
+ req->status = cqe->status;
+ req->result = cqe->result;
+
+ if (wc->wc_flags & IB_WC_WITH_INVALIDATE) {
+ if (unlikely(wc->ex.invalidate_rkey != req->mr->rkey)) {
+ dev_err(queue->ctrl->ctrl.device,
+ "Bogus remote invalidation for rkey %#x\n",
+ req->mr->rkey);
+ nvme_rdma_error_recovery(queue->ctrl);
+ }
+ } else if (req->mr) {
+ ret = nvme_rdma_inv_rkey(queue, req);
+ if (unlikely(ret < 0)) {
+ dev_err(queue->ctrl->ctrl.device,
+ "Queueing INV WR for rkey %#x failed (%d)\n",
+ req->mr->rkey, ret);
+ nvme_rdma_error_recovery(queue->ctrl);
+ }
+ /* the local invalidation completion will end the request */
+ return 0;
+ }
+
+ if (refcount_dec_and_test(&req->ref)) {
+ if (rq->tag == tag)
+ ret = 1;
+ nvme_end_request(rq, req->status, req->result);
+ }
+
+ 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_AQ_BLK_MQ_DEPTH))
+ nvme_complete_async_event(&queue->ctrl->ctrl, cqe->status,
+ &cqe->result);
+ 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)
+{
+ 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);
+
+ dev_err(queue->ctrl->ctrl.device,
+ "Connect rejected: status %d (%s) nvme status %d (%s).\n",
+ status, rej_msg, sts, nvme_rdma_cm_msg(sts));
+ } else {
+ dev_err(queue->ctrl->ctrl.device,
+ "Connect rejected: status %d (%s).\n", status, rej_msg);
+ }
+
+ return -ECONNRESET;
+}
+
+static int nvme_rdma_addr_resolved(struct nvme_rdma_queue *queue)
+{
+ int ret;
+
+ ret = nvme_rdma_create_queue_ib(queue);
+ if (ret)
+ return ret;
+
+ 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);
+ 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 = { };
+ struct nvme_rdma_cm_req priv = { };
+ int ret;
+
+ param.qp_num = queue->qp->qp_num;
+ param.flow_control = 1;
+
+ param.responder_resources = queue->device->dev->attrs.max_qp_rd_atom;
+ /* maximum retry count */
+ param.retry_count = 7;
+ 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));
+ /*
+ * set the admin queue depth to the minimum size
+ * specified by the Fabrics standard.
+ */
+ if (priv.qid == 0) {
+ priv.hrqsize = cpu_to_le16(NVME_AQ_DEPTH);
+ priv.hsqsize = cpu_to_le16(NVME_AQ_DEPTH - 1);
+ } else {
+ /*
+ * current interpretation of the fabrics spec
+ * is at minimum you make hrqsize sqsize+1, or a
+ * 1's based representation of sqsize.
+ */
+ priv.hrqsize = cpu_to_le16(queue->queue_size);
+ priv.hsqsize = cpu_to_le16(queue->ctrl->ctrl.sqsize);
+ }
+
+ ret = rdma_connect(queue->cm_id, ¶m);
+ 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:
+ nvme_rdma_destroy_queue_ib(queue);
+ cm_error = nvme_rdma_conn_rejected(queue, ev);
+ break;
+ case RDMA_CM_EVENT_ROUTE_ERROR:
+ case RDMA_CM_EVENT_CONNECT_ERROR:
+ case RDMA_CM_EVENT_UNREACHABLE:
+ nvme_rdma_destroy_queue_ib(queue);
+ /* fall through */
+ case RDMA_CM_EVENT_ADDR_ERROR:
+ 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:
+ /* device removal is handled via the ib_client API */
+ break;
+ 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);
+
+ dev_warn(req->queue->ctrl->ctrl.device,
+ "I/O %d QID %d timeout, reset controller\n",
+ rq->tag, nvme_rdma_queue_idx(req->queue));
+
+ /* queue error recovery */
+ nvme_rdma_error_recovery(req->queue->ctrl);
+
+ /* fail with DNR on cmd timeout */
+ nvme_req(rq)->status = NVME_SC_ABORT_REQ | NVME_SC_DNR;
+
+ return BLK_EH_DONE;
+}
+
+static blk_status_t 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;
+ struct ib_device *dev;
+ bool queue_ready = test_bit(NVME_RDMA_Q_LIVE, &queue->flags);
+ blk_status_t ret;
+ int err;
+
+ WARN_ON_ONCE(rq->tag < 0);
+
+ if (!nvmf_check_ready(&queue->ctrl->ctrl, rq, queue_ready))
+ return nvmf_fail_nonready_command(&queue->ctrl->ctrl, rq);
+
+ 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);
+ if (ret)
+ return ret;
+
+ blk_mq_start_request(rq);
+
+ err = nvme_rdma_map_data(queue, rq, c);
+ if (unlikely(err < 0)) {
+ dev_err(queue->ctrl->ctrl.device,
+ "Failed to map data (%d)\n", err);
+ nvme_cleanup_cmd(rq);
+ goto err;
+ }
+
+ sqe->cqe.done = nvme_rdma_send_done;
+
+ ib_dma_sync_single_for_device(dev, sqe->dma,
+ sizeof(struct nvme_command), DMA_TO_DEVICE);
+
+ err = nvme_rdma_post_send(queue, sqe, req->sge, req->num_sge,
+ req->mr ? &req->reg_wr.wr : NULL);
+ if (unlikely(err)) {
+ nvme_rdma_unmap_data(queue, rq);
+ goto err;
+ }
+
+ return BLK_STS_OK;
+err:
+ if (err == -ENOMEM || err == -EAGAIN)
+ return BLK_STS_RESOURCE;
+ return BLK_STS_IOERR;
+}
+
+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;
+
+ 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);
+
+ nvme_rdma_unmap_data(req->queue, rq);
+ nvme_complete_rq(rq);
+}
+
+static int nvme_rdma_map_queues(struct blk_mq_tag_set *set)
+{
+ struct nvme_rdma_ctrl *ctrl = set->driver_data;
+
+ return blk_mq_rdma_map_queues(set, ctrl->device->dev, 0);
+}
+
+static const 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,
+ .init_hctx = nvme_rdma_init_hctx,
+ .poll = nvme_rdma_poll,
+ .timeout = nvme_rdma_timeout,
+ .map_queues = nvme_rdma_map_queues,
+};
+
+static const 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_request,
+ .exit_request = nvme_rdma_exit_request,
+ .init_hctx = nvme_rdma_init_admin_hctx,
+ .timeout = nvme_rdma_timeout,
+};
+
+static void nvme_rdma_shutdown_ctrl(struct nvme_rdma_ctrl *ctrl, bool shutdown)
+{
+ nvme_rdma_teardown_io_queues(ctrl, shutdown);
+ if (shutdown)
+ nvme_shutdown_ctrl(&ctrl->ctrl);
+ else
+ nvme_disable_ctrl(&ctrl->ctrl, ctrl->ctrl.cap);
+ nvme_rdma_teardown_admin_queue(ctrl, shutdown);
+}
+
+static void nvme_rdma_delete_ctrl(struct nvme_ctrl *ctrl)
+{
+ nvme_rdma_shutdown_ctrl(to_rdma_ctrl(ctrl), true);
+}
+
+static void nvme_rdma_reset_ctrl_work(struct work_struct *work)
+{
+ struct nvme_rdma_ctrl *ctrl =
+ container_of(work, struct nvme_rdma_ctrl, ctrl.reset_work);
+
+ nvme_stop_ctrl(&ctrl->ctrl);
+ nvme_rdma_shutdown_ctrl(ctrl, false);
+
+ if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_CONNECTING)) {
+ /* state change failure should never happen */
+ WARN_ON_ONCE(1);
+ return;
+ }
+
+ if (nvme_rdma_setup_ctrl(ctrl, false))
+ goto out_fail;
+
+ return;
+
+out_fail:
+ ++ctrl->ctrl.nr_reconnects;
+ nvme_rdma_reconnect_or_remove(ctrl);
+}
+
+static const struct nvme_ctrl_ops nvme_rdma_ctrl_ops = {
+ .name = "rdma",
+ .module = THIS_MODULE,
+ .flags = NVME_F_FABRICS,
+ .reg_read32 = nvmf_reg_read32,
+ .reg_read64 = nvmf_reg_read64,
+ .reg_write32 = nvmf_reg_write32,
+ .free_ctrl = nvme_rdma_free_ctrl,
+ .submit_async_event = nvme_rdma_submit_async_event,
+ .delete_ctrl = nvme_rdma_delete_ctrl,
+ .get_address = nvmf_get_address,
+ .stop_ctrl = nvme_rdma_stop_ctrl,
+};
+
+static inline bool
+__nvme_rdma_options_match(struct nvme_rdma_ctrl *ctrl,
+ struct nvmf_ctrl_options *opts)
+{
+ char *stdport = __stringify(NVME_RDMA_IP_PORT);
+
+
+ if (!nvmf_ctlr_matches_baseopts(&ctrl->ctrl, opts) ||
+ strcmp(opts->traddr, ctrl->ctrl.opts->traddr))
+ return false;
+
+ if (opts->mask & NVMF_OPT_TRSVCID &&
+ ctrl->ctrl.opts->mask & NVMF_OPT_TRSVCID) {
+ if (strcmp(opts->trsvcid, ctrl->ctrl.opts->trsvcid))
+ return false;
+ } else if (opts->mask & NVMF_OPT_TRSVCID) {
+ if (strcmp(opts->trsvcid, stdport))
+ return false;
+ } else if (ctrl->ctrl.opts->mask & NVMF_OPT_TRSVCID) {
+ if (strcmp(stdport, ctrl->ctrl.opts->trsvcid))
+ return false;
+ }
+ /* else, it's a match as both have stdport. Fall to next checks */
+
+ /*
+ * checking the local address is rough. In most cases, one
+ * is not specified and the host port is selected by the stack.
+ *
+ * Assume no match if:
+ * local address is specified and address is not the same
+ * local address is not specified but remote is, or vice versa
+ * (admin using specific host_traddr when it matters).
+ */
+ if (opts->mask & NVMF_OPT_HOST_TRADDR &&
+ ctrl->ctrl.opts->mask & NVMF_OPT_HOST_TRADDR) {
+ if (strcmp(opts->host_traddr, ctrl->ctrl.opts->host_traddr))
+ return false;
+ } else if (opts->mask & NVMF_OPT_HOST_TRADDR ||
+ ctrl->ctrl.opts->mask & NVMF_OPT_HOST_TRADDR)
+ return false;
+ /*
+ * if neither controller had an host port specified, assume it's
+ * a match as everything else matched.
+ */
+
+ return true;
+}
+
+/*
+ * Fails a connection request if it matches an existing controller
+ * (association) with the same tuple:
+ * <Host NQN, Host ID, local address, remote address, remote port, SUBSYS NQN>
+ *
+ * if local address is not specified in the request, it will match an
+ * existing controller with all the other parameters the same and no
+ * local port address specified as well.
+ *
+ * The ports don't need to be compared as they are intrinsically
+ * already matched by the port pointers supplied.
+ */
+static bool
+nvme_rdma_existing_controller(struct nvmf_ctrl_options *opts)
+{
+ struct nvme_rdma_ctrl *ctrl;
+ bool found = false;
+
+ mutex_lock(&nvme_rdma_ctrl_mutex);
+ list_for_each_entry(ctrl, &nvme_rdma_ctrl_list, list) {
+ found = __nvme_rdma_options_match(ctrl, opts);
+ if (found)
+ break;
+ }
+ mutex_unlock(&nvme_rdma_ctrl_mutex);
+
+ return found;
+}
+
+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;
+ char *port;
+
+ ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
+ if (!ctrl)
+ return ERR_PTR(-ENOMEM);
+ ctrl->ctrl.opts = opts;
+ INIT_LIST_HEAD(&ctrl->list);
+
+ if (opts->mask & NVMF_OPT_TRSVCID)
+ port = opts->trsvcid;
+ else
+ port = __stringify(NVME_RDMA_IP_PORT);
+
+ ret = inet_pton_with_scope(&init_net, AF_UNSPEC,
+ opts->traddr, port, &ctrl->addr);
+ if (ret) {
+ pr_err("malformed address passed: %s:%s\n", opts->traddr, port);
+ goto out_free_ctrl;
+ }
+
+ if (opts->mask & NVMF_OPT_HOST_TRADDR) {
+ ret = inet_pton_with_scope(&init_net, AF_UNSPEC,
+ opts->host_traddr, NULL, &ctrl->src_addr);
+ if (ret) {
+ pr_err("malformed src address passed: %s\n",
+ opts->host_traddr);
+ goto out_free_ctrl;
+ }
+ }
+
+ if (!opts->duplicate_connect && nvme_rdma_existing_controller(opts)) {
+ ret = -EALREADY;
+ goto out_free_ctrl;
+ }
+
+ INIT_DELAYED_WORK(&ctrl->reconnect_work,
+ nvme_rdma_reconnect_ctrl_work);
+ INIT_WORK(&ctrl->err_work, nvme_rdma_error_recovery_work);
+ INIT_WORK(&ctrl->ctrl.reset_work, nvme_rdma_reset_ctrl_work);
+
+ ctrl->ctrl.queue_count = opts->nr_io_queues + 1; /* +1 for admin queue */
+ ctrl->ctrl.sqsize = opts->queue_size - 1;
+ ctrl->ctrl.kato = opts->kato;
+
+ ret = -ENOMEM;
+ ctrl->queues = kcalloc(ctrl->ctrl.queue_count, sizeof(*ctrl->queues),
+ GFP_KERNEL);
+ if (!ctrl->queues)
+ goto out_free_ctrl;
+
+ ret = nvme_init_ctrl(&ctrl->ctrl, dev, &nvme_rdma_ctrl_ops,
+ 0 /* no quirks, we're perfect! */);
+ if (ret)
+ goto out_kfree_queues;
+
+ changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_CONNECTING);
+ WARN_ON_ONCE(!changed);
+
+ ret = nvme_rdma_setup_ctrl(ctrl, true);
+ if (ret)
+ goto out_uninit_ctrl;
+
+ dev_info(ctrl->ctrl.device, "new ctrl: NQN \"%s\", addr %pISpcs\n",
+ ctrl->ctrl.opts->subsysnqn, &ctrl->addr);
+
+ nvme_get_ctrl(&ctrl->ctrl);
+
+ mutex_lock(&nvme_rdma_ctrl_mutex);
+ list_add_tail(&ctrl->list, &nvme_rdma_ctrl_list);
+ mutex_unlock(&nvme_rdma_ctrl_mutex);
+
+ return &ctrl->ctrl;
+
+out_uninit_ctrl:
+ nvme_uninit_ctrl(&ctrl->ctrl);
+ nvme_put_ctrl(&ctrl->ctrl);
+ if (ret > 0)
+ ret = -EIO;
+ return ERR_PTR(ret);
+out_kfree_queues:
+ kfree(ctrl->queues);
+out_free_ctrl:
+ kfree(ctrl);
+ return ERR_PTR(ret);
+}
+
+static struct nvmf_transport_ops nvme_rdma_transport = {
+ .name = "rdma",
+ .module = THIS_MODULE,
+ .required_opts = NVMF_OPT_TRADDR,
+ .allowed_opts = NVMF_OPT_TRSVCID | NVMF_OPT_RECONNECT_DELAY |
+ NVMF_OPT_HOST_TRADDR | NVMF_OPT_CTRL_LOSS_TMO,
+ .create_ctrl = nvme_rdma_create_ctrl,
+};
+
+static void nvme_rdma_remove_one(struct ib_device *ib_device, void *client_data)
+{
+ struct nvme_rdma_ctrl *ctrl;
+ struct nvme_rdma_device *ndev;
+ bool found = false;
+
+ mutex_lock(&device_list_mutex);
+ list_for_each_entry(ndev, &device_list, entry) {
+ if (ndev->dev == ib_device) {
+ found = true;
+ break;
+ }
+ }
+ mutex_unlock(&device_list_mutex);
+
+ if (!found)
+ return;
+
+ /* 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;
+ nvme_delete_ctrl(&ctrl->ctrl);
+ }
+ mutex_unlock(&nvme_rdma_ctrl_mutex);
+
+ flush_workqueue(nvme_delete_wq);
+}
+
+static struct ib_client nvme_rdma_ib_client = {
+ .name = "nvme_rdma",
+ .remove = nvme_rdma_remove_one
+};
+
+static int __init nvme_rdma_init_module(void)
+{
+ int ret;
+
+ ret = ib_register_client(&nvme_rdma_ib_client);
+ if (ret)
+ return ret;
+
+ ret = nvmf_register_transport(&nvme_rdma_transport);
+ if (ret)
+ goto err_unreg_client;
+
+ return 0;
+
+err_unreg_client:
+ ib_unregister_client(&nvme_rdma_ib_client);
+ return ret;
+}
+
+static void __exit nvme_rdma_cleanup_module(void)
+{
+ nvmf_unregister_transport(&nvme_rdma_transport);
+ ib_unregister_client(&nvme_rdma_ib_client);
+}
+
+module_init(nvme_rdma_init_module);
+module_exit(nvme_rdma_cleanup_module);
+
+MODULE_LICENSE("GPL v2");