Messages in this thread | | | Subject | Re: [PATCH 5/5] nvme-rdma: add a NVMe over Fabrics RDMA host driver | From | Sagi Grimberg <> | Date | Tue, 7 Jun 2016 15:00:53 +0300 |
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We forgot to CC Linux-rdma, CC'ing...
On 07/06/16 00:23, Christoph Hellwig wrote: > This patch implements the RDMA host (initiator in SCSI speak) driver. It > can be used to connect to remote NVMe over Fabrics controllers over > Infiniband, RoCE or iWarp, and uses the existing NVMe core driver as well > a the new fabrics library. > > To connect to all NVMe over Fabrics controller reachable on a given taget > port using RDMA/CM use the following command: > > nvme connect-all -t rdma -a $IPADDR > > This requires the latest version of nvme-cli with Fabrics support. > > Signed-off-by: Jay Freyensee <james.p.freyensee@intel.com> > Signed-off-by: Ming Lin <ming.l@ssi.samsung.com> > Signed-off-by: Sagi Grimberg <sagi@grimberg.me> > Signed-off-by: Christoph Hellwig <hch@lst.de> > --- > drivers/nvme/host/Kconfig | 16 + > drivers/nvme/host/Makefile | 3 + > drivers/nvme/host/rdma.c | 2009 ++++++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 2028 insertions(+) > create mode 100644 drivers/nvme/host/rdma.c > > diff --git a/drivers/nvme/host/Kconfig b/drivers/nvme/host/Kconfig > index 3397651..db39d53 100644 > --- a/drivers/nvme/host/Kconfig > +++ b/drivers/nvme/host/Kconfig > @@ -27,3 +27,19 @@ config BLK_DEV_NVME_SCSI > > config NVME_FABRICS > tristate > + > +config NVME_RDMA > + tristate "NVM Express over Fabrics RDMA host driver" > + depends on INFINIBAND > + depends on BLK_DEV_NVME > + select NVME_FABRICS > + select SG_POOL > + help > + This provides support for the NVMe over Fabrics protocol using > + the RDMA (Infiniband, RoCE, iWarp) transport. This allows you > + to use remote block devices exported using the NVMe protocol set. > + > + To configure a NVMe over Fabrics controller use the nvme-cli tool > + from https://github.com/linux-nvme/nvme-cli. > + > + If unsure, say N. > diff --git a/drivers/nvme/host/Makefile b/drivers/nvme/host/Makefile > index 5f8648f..47abcec 100644 > --- a/drivers/nvme/host/Makefile > +++ b/drivers/nvme/host/Makefile > @@ -1,6 +1,7 @@ > obj-$(CONFIG_NVME_CORE) += nvme-core.o > obj-$(CONFIG_BLK_DEV_NVME) += nvme.o > obj-$(CONFIG_NVME_FABRICS) += nvme-fabrics.o > +obj-$(CONFIG_NVME_RDMA) += nvme-rdma.o > > nvme-core-y := core.o > nvme-core-$(CONFIG_BLK_DEV_NVME_SCSI) += scsi.o > @@ -9,3 +10,5 @@ nvme-core-$(CONFIG_NVM) += lightnvm.o > nvme-y += pci.o > > nvme-fabrics-y += fabrics.o > + > +nvme-rdma-y += rdma.o > diff --git a/drivers/nvme/host/rdma.c b/drivers/nvme/host/rdma.c > new file mode 100644 > index 0000000..4edc912 > --- /dev/null > +++ b/drivers/nvme/host/rdma.c > @@ -0,0 +1,2009 @@ > +/* > + * 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/delay.h> > +#include <linux/module.h> > +#include <linux/init.h> > +#include <linux/slab.h> > +#include <linux/err.h> > +#include <linux/string.h> > +#include <linux/jiffies.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 <linux/t10-pi.h> > +#include <asm/unaligned.h> > + > +#include <rdma/ib_verbs.h> > +#include <rdma/rdma_cm.h> > +#include <rdma/ib_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 > + > +#define NVME_RDMA_MAX_PAGES_PER_MR 512 > + > +#define NVME_RDMA_DEF_RECONNECT_DELAY 20 > + > +/* > + * 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 ib_mr *mr; > + 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 { > + 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; > + bool need_inval; > + 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), > +}; > + > +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 */ > + unsigned short tl_retry_count; > + 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); > +static int __nvme_rdma_del_ctrl(struct nvme_rdma_ctrl *ctrl); > + > +/* 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) > +{ > + pr_debug("QP event %d\n", 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 + 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; > + > + if (!req->need_inval) > + 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)) { > + req->mr = NULL; > + ret = PTR_ERR(req->mr); > + } > + > + req->need_inval = false; > + > +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); > + > + if (!register_always) > + ib_dereg_mr(ndev->mr); > + 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); > + if (IS_ERR(ndev->pd)) > + goto out_free_dev; > + > + if (!register_always) { > + ndev->mr = ib_get_dma_mr(ndev->pd, > + IB_ACCESS_LOCAL_WRITE | > + IB_ACCESS_REMOTE_READ | > + IB_ACCESS_REMOTE_WRITE); > + if (IS_ERR(ndev->mr)) > + goto out_free_pd; > + } > + > + 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_mr; > + } > + > + list_add(&ndev->entry, &device_list); > +out_unlock: > + mutex_unlock(&device_list_mutex); > + return ndev; > + > +out_free_mr: > + if (!register_always) > + ib_dereg_mr(ndev->mr); > +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 = queue->device; > + struct ib_device *ibdev = dev->dev; > + > + 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; > + } > + > + 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; > + } > + > + set_bit(NVME_RDMA_Q_CONNECTED, &queue->flags); > + > + return 0; > + > +out_destroy_cm_id: > + rdma_destroy_id(queue->cm_id); > + return ret; > +} > + > +static void nvme_rdma_free_queue(struct nvme_rdma_queue *queue) > +{ > + if (!test_and_clear_bit(NVME_RDMA_Q_CONNECTED, &queue->flags)) > + return; > + > + rdma_disconnect(queue->cm_id); > + ib_drain_qp(queue->qp); > + 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->queue_count; i++) > + nvme_rdma_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); > + if (ret) > + break; > + } > + > + 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++) { > + ret = nvme_rdma_init_queue(ctrl, i, ctrl->ctrl.sqsize); > + 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: > + for (; i >= 1; i--) > + nvme_rdma_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_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); > + > + 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); > + } > + 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_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; > + > + 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); > + > + if (ctrl->queue_count > 1) > + nvme_start_queues(&ctrl->ctrl); > + > + 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); > + > + nvme_stop_keep_alive(&ctrl->ctrl); > + 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; > + > + if (req->need_inval) { > + 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); > + put_unaligned_le32(queue->device->mr->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; > + > + 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; > + > + req->need_inval = true; > + > + 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; > + int nents, count; > + int ret; > + > + req->num_sge = 1; > + req->inline_data = false; > + req->need_inval = false; > + > + 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; > + ret = sg_alloc_table_chained(&req->sg_table, rq->nr_phys_segments, > + req->sg_table.sgl); > + if (ret) > + return -ENOMEM; > + > + nents = blk_rq_map_sg(rq->q, rq, req->sg_table.sgl); > + BUG_ON(nents > rq->nr_phys_segments); > + req->nents = nents; > + > + count = ib_dma_map_sg(ibdev, req->sg_table.sgl, nents, > + 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); > + > + if (!register_always) > + 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 = ≀ > + else > + first = ≀ > + > + 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; > + 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) > +{ > + u16 status = le16_to_cpu(cqe->status); > + struct request *rq; > + struct nvme_rdma_request *req; > + int ret = 0; > + > + status >>= 1; > + > + 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->cmd_type == REQ_TYPE_DRV_PRIV && rq->special) > + memcpy(rq->special, cqe, sizeof(*cqe)); > + > + if (rq->tag == tag) > + ret = 1; > + > + if ((wc->wc_flags & IB_WC_WITH_INVALIDATE) && > + wc->ex.invalidate_rkey == req->mr->rkey) > + req->need_inval = false; > + > + blk_mq_complete_request(rq, status); > + > + 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)) > + nvme_complete_async_event(&queue->ctrl->ctrl, cqe); > + 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) > +{ > + if (ev->status == IB_CM_REJ_CONSUMER_DEFINED) { > + struct nvme_rdma_cm_rej *rej = > + (struct nvme_rdma_cm_rej *)ev->param.conn.private_data; > + > + dev_err(queue->ctrl->ctrl.device, > + "Connect rejected, status %d.", le16_to_cpu(rej->sts)); > + /* XXX: Think of something clever to do here... */ > + } else { > + dev_err(queue->ctrl->ctrl.device, > + "Connect rejected, no private data.\n"); > + } > + > + 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 = { }; > + 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; > + /* rdma_cm will clamp down to max QP retry count (7) */ > + param.retry_count = ctrl->tl_retry_count; > + 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)); > + priv.hrqsize = cpu_to_le16(queue->queue_size); > + priv.hsqsize = cpu_to_le16(queue->queue_size); > + > + 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; > +} > + > +/** > + * nvme_rdma_device_unplug() - Handle RDMA device unplug > + * @queue: Queue that owns the cm_id that caught the event > + * > + * DEVICE_REMOVAL event notifies us that the RDMA device is about > + * to unplug so we should take care of destroying our RDMA resources. > + * This event will be generated for each allocated cm_id. > + * > + * In our case, the RDMA resources are managed per controller and not > + * only per queue. So the way we handle this is we trigger an implicit > + * controller deletion upon the first DEVICE_REMOVAL event we see, and > + * hold the event inflight until the controller deletion is completed. > + * > + * One exception that we need to handle is the destruction of the cm_id > + * that caught the event. Since we hold the callout until the controller > + * deletion is completed, we'll deadlock if the controller deletion will > + * call rdma_destroy_id on this queue's cm_id. Thus, we claim ownership > + * of destroying this queue before-hand, destroy the queue resources > + * after the controller deletion completed with the exception of destroying > + * the cm_id implicitely by returning a non-zero rc to the callout. > + */ > +static int nvme_rdma_device_unplug(struct nvme_rdma_queue *queue) > +{ > + struct nvme_rdma_ctrl *ctrl = queue->ctrl; > + int ret, ctrl_deleted = 0; > + > + /* First disable the queue so ctrl delete won't free it */ > + if (!test_and_clear_bit(NVME_RDMA_Q_CONNECTED, &queue->flags)) > + goto out; > + > + /* delete the controller */ > + ret = __nvme_rdma_del_ctrl(ctrl); > + if (!ret) { > + dev_warn(ctrl->ctrl.device, > + "Got rdma device removal event, deleting ctrl\n"); > + flush_work(&ctrl->delete_work); > + > + /* Return non-zero so the cm_id will destroy implicitly */ > + ctrl_deleted = 1; > + > + /* Free this queue ourselves */ > + rdma_disconnect(queue->cm_id); > + ib_drain_qp(queue->qp); > + nvme_rdma_destroy_queue_ib(queue); > + } > + > +out: > + return ctrl_deleted; > +} > + > +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: > + /* return 1 means impliciy CM ID destroy */ > + return nvme_rdma_device_unplug(queue); > + 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; > +} > + > +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); > + > + 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; > + > + c->common.command_id = rq->tag; > + 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 && (rq->cmd_flags & REQ_FLUSH)) > + flush = true; > + ret = nvme_rdma_post_send(queue, sqe, req->sge, req->num_sge, > + req->need_inval ? &req->reg_wr.wr : NULL, flush); > + 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, > + .map_queue = blk_mq_map_queue, > + .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, > + .map_queue = blk_mq_map_queue, > + .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; > + > + 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; > + > + nvme_start_keep_alive(&ctrl->ctrl); > + > + 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; > + > + return 0; > + > +out_cleanup_queue: > + blk_cleanup_queue(ctrl->ctrl.admin_q); > +out_free_tagset: > + 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); > + } > + > + if (ctrl->ctrl.state == NVME_CTRL_LIVE) > + 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); > +} > + > +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); > + > + nvme_remove_namespaces(&ctrl->ctrl); > + nvme_rdma_shutdown_ctrl(ctrl); > + nvme_uninit_ctrl(&ctrl->ctrl); > + nvme_put_ctrl(&ctrl->ctrl); > +} > + > +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); > + int ret; > + > + ret = __nvme_rdma_del_ctrl(ctrl); > + if (ret) > + return ret; > + > + flush_work(&ctrl->delete_work); > + > + return 0; > +} > + > +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); > + > + nvme_remove_namespaces(&ctrl->ctrl); > + nvme_uninit_ctrl(&ctrl->ctrl); > + nvme_put_ctrl(&ctrl->ctrl); > +} > + > +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); > + } > + > + 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; > + ctrl->tag_set.queue_depth = ctrl->ctrl.sqsize; > + ctrl->tag_set.reserved_tags = 1; /* fabric connect */ > + ctrl->tag_set.numa_node = NUMA_NO_NODE; > + ctrl->tag_set.flags = BLK_MQ_F_SHOULD_MERGE; > + ctrl->tag_set.cmd_size = sizeof(struct nvme_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: > + nvme_stop_keep_alive(&ctrl->ctrl); > + 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 */ > + ctrl->ctrl.sqsize = opts->queue_size; > + ctrl->tl_retry_count = opts->tl_retry_count; > + 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; > + } > + > + 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_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, > + .allowed_opts = NVMF_OPT_TRSVCID | NVMF_OPT_TL_RETRY_COUNT | > + NVMF_OPT_RECONNECT_DELAY, > + .create_ctrl = nvme_rdma_create_ctrl, > +}; > + > +static int __init nvme_rdma_init_module(void) > +{ > + nvme_rdma_wq = create_workqueue("nvme_rdma_wq"); > + if (!nvme_rdma_wq) > + return -ENOMEM; > + > + nvmf_register_transport(&nvme_rdma_transport); > + return 0; > +} > + > +static void __exit nvme_rdma_cleanup_module(void) > +{ > + struct nvme_rdma_ctrl *ctrl; > + > + nvmf_unregister_transport(&nvme_rdma_transport); > + > + mutex_lock(&nvme_rdma_ctrl_mutex); > + list_for_each_entry(ctrl, &nvme_rdma_ctrl_list, list) > + __nvme_rdma_del_ctrl(ctrl); > + mutex_unlock(&nvme_rdma_ctrl_mutex); > + > + destroy_workqueue(nvme_rdma_wq); > +} > + > +module_init(nvme_rdma_init_module); > +module_exit(nvme_rdma_cleanup_module); > + > +MODULE_LICENSE("GPL v2"); >
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