| /* |
| * NVMe over Fabrics RDMA target. |
| * 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/atomic.h> |
| #include <linux/ctype.h> |
| #include <linux/delay.h> |
| #include <linux/err.h> |
| #include <linux/init.h> |
| #include <linux/module.h> |
| #include <linux/nvme.h> |
| #include <linux/slab.h> |
| #include <linux/string.h> |
| #include <linux/wait.h> |
| #include <linux/inet.h> |
| #include <asm/unaligned.h> |
| |
| #include <rdma/ib_verbs.h> |
| #include <rdma/rdma_cm.h> |
| #include <rdma/rw.h> |
| |
| #include <linux/nvme-rdma.h> |
| #include "nvmet.h" |
| |
| /* |
| * We allow up to a page of inline data to go with the SQE |
| */ |
| #define NVMET_RDMA_INLINE_DATA_SIZE PAGE_SIZE |
| |
| struct nvmet_rdma_cmd { |
| struct ib_sge sge[2]; |
| struct ib_cqe cqe; |
| struct ib_recv_wr wr; |
| struct scatterlist inline_sg; |
| struct page *inline_page; |
| struct nvme_command *nvme_cmd; |
| struct nvmet_rdma_queue *queue; |
| }; |
| |
| enum { |
| NVMET_RDMA_REQ_INLINE_DATA = (1 << 0), |
| NVMET_RDMA_REQ_INVALIDATE_RKEY = (1 << 1), |
| }; |
| |
| struct nvmet_rdma_rsp { |
| struct ib_sge send_sge; |
| struct ib_cqe send_cqe; |
| struct ib_send_wr send_wr; |
| |
| struct nvmet_rdma_cmd *cmd; |
| struct nvmet_rdma_queue *queue; |
| |
| struct ib_cqe read_cqe; |
| struct rdma_rw_ctx rw; |
| |
| struct nvmet_req req; |
| |
| u8 n_rdma; |
| u32 flags; |
| u32 invalidate_rkey; |
| |
| struct list_head wait_list; |
| struct list_head free_list; |
| }; |
| |
| enum nvmet_rdma_queue_state { |
| NVMET_RDMA_Q_CONNECTING, |
| NVMET_RDMA_Q_LIVE, |
| NVMET_RDMA_Q_DISCONNECTING, |
| NVMET_RDMA_IN_DEVICE_REMOVAL, |
| }; |
| |
| struct nvmet_rdma_queue { |
| struct rdma_cm_id *cm_id; |
| struct nvmet_port *port; |
| struct ib_cq *cq; |
| atomic_t sq_wr_avail; |
| struct nvmet_rdma_device *dev; |
| spinlock_t state_lock; |
| enum nvmet_rdma_queue_state state; |
| struct nvmet_cq nvme_cq; |
| struct nvmet_sq nvme_sq; |
| |
| struct nvmet_rdma_rsp *rsps; |
| struct list_head free_rsps; |
| spinlock_t rsps_lock; |
| struct nvmet_rdma_cmd *cmds; |
| |
| struct work_struct release_work; |
| struct list_head rsp_wait_list; |
| struct list_head rsp_wr_wait_list; |
| spinlock_t rsp_wr_wait_lock; |
| |
| int idx; |
| int host_qid; |
| int recv_queue_size; |
| int send_queue_size; |
| |
| struct list_head queue_list; |
| }; |
| |
| struct nvmet_rdma_device { |
| struct ib_device *device; |
| struct ib_pd *pd; |
| struct ib_srq *srq; |
| struct nvmet_rdma_cmd *srq_cmds; |
| size_t srq_size; |
| struct kref ref; |
| struct list_head entry; |
| }; |
| |
| static bool nvmet_rdma_use_srq; |
| module_param_named(use_srq, nvmet_rdma_use_srq, bool, 0444); |
| MODULE_PARM_DESC(use_srq, "Use shared receive queue."); |
| |
| static DEFINE_IDA(nvmet_rdma_queue_ida); |
| static LIST_HEAD(nvmet_rdma_queue_list); |
| static DEFINE_MUTEX(nvmet_rdma_queue_mutex); |
| |
| static LIST_HEAD(device_list); |
| static DEFINE_MUTEX(device_list_mutex); |
| |
| static bool nvmet_rdma_execute_command(struct nvmet_rdma_rsp *rsp); |
| static void nvmet_rdma_send_done(struct ib_cq *cq, struct ib_wc *wc); |
| static void nvmet_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc); |
| static void nvmet_rdma_read_data_done(struct ib_cq *cq, struct ib_wc *wc); |
| static void nvmet_rdma_qp_event(struct ib_event *event, void *priv); |
| static void nvmet_rdma_queue_disconnect(struct nvmet_rdma_queue *queue); |
| |
| static struct nvmet_fabrics_ops nvmet_rdma_ops; |
| |
| /* XXX: really should move to a generic header sooner or later.. */ |
| static inline u32 get_unaligned_le24(const u8 *p) |
| { |
| return (u32)p[0] | (u32)p[1] << 8 | (u32)p[2] << 16; |
| } |
| |
| static inline bool nvmet_rdma_need_data_in(struct nvmet_rdma_rsp *rsp) |
| { |
| return nvme_is_write(rsp->req.cmd) && |
| rsp->req.data_len && |
| !(rsp->flags & NVMET_RDMA_REQ_INLINE_DATA); |
| } |
| |
| static inline bool nvmet_rdma_need_data_out(struct nvmet_rdma_rsp *rsp) |
| { |
| return !nvme_is_write(rsp->req.cmd) && |
| rsp->req.data_len && |
| !rsp->req.rsp->status && |
| !(rsp->flags & NVMET_RDMA_REQ_INLINE_DATA); |
| } |
| |
| static inline struct nvmet_rdma_rsp * |
| nvmet_rdma_get_rsp(struct nvmet_rdma_queue *queue) |
| { |
| struct nvmet_rdma_rsp *rsp; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&queue->rsps_lock, flags); |
| rsp = list_first_entry(&queue->free_rsps, |
| struct nvmet_rdma_rsp, free_list); |
| list_del(&rsp->free_list); |
| spin_unlock_irqrestore(&queue->rsps_lock, flags); |
| |
| return rsp; |
| } |
| |
| static inline void |
| nvmet_rdma_put_rsp(struct nvmet_rdma_rsp *rsp) |
| { |
| unsigned long flags; |
| |
| spin_lock_irqsave(&rsp->queue->rsps_lock, flags); |
| list_add_tail(&rsp->free_list, &rsp->queue->free_rsps); |
| spin_unlock_irqrestore(&rsp->queue->rsps_lock, flags); |
| } |
| |
| static void nvmet_rdma_free_sgl(struct scatterlist *sgl, unsigned int nents) |
| { |
| struct scatterlist *sg; |
| int count; |
| |
| if (!sgl || !nents) |
| return; |
| |
| for_each_sg(sgl, sg, nents, count) |
| __free_page(sg_page(sg)); |
| kfree(sgl); |
| } |
| |
| static int nvmet_rdma_alloc_sgl(struct scatterlist **sgl, unsigned int *nents, |
| u32 length) |
| { |
| struct scatterlist *sg; |
| struct page *page; |
| unsigned int nent; |
| int i = 0; |
| |
| nent = DIV_ROUND_UP(length, PAGE_SIZE); |
| sg = kmalloc_array(nent, sizeof(struct scatterlist), GFP_KERNEL); |
| if (!sg) |
| goto out; |
| |
| sg_init_table(sg, nent); |
| |
| while (length) { |
| u32 page_len = min_t(u32, length, PAGE_SIZE); |
| |
| page = alloc_page(GFP_KERNEL); |
| if (!page) |
| goto out_free_pages; |
| |
| sg_set_page(&sg[i], page, page_len, 0); |
| length -= page_len; |
| i++; |
| } |
| *sgl = sg; |
| *nents = nent; |
| return 0; |
| |
| out_free_pages: |
| while (i > 0) { |
| i--; |
| __free_page(sg_page(&sg[i])); |
| } |
| kfree(sg); |
| out: |
| return NVME_SC_INTERNAL; |
| } |
| |
| static int nvmet_rdma_alloc_cmd(struct nvmet_rdma_device *ndev, |
| struct nvmet_rdma_cmd *c, bool admin) |
| { |
| /* NVMe command / RDMA RECV */ |
| c->nvme_cmd = kmalloc(sizeof(*c->nvme_cmd), GFP_KERNEL); |
| if (!c->nvme_cmd) |
| goto out; |
| |
| c->sge[0].addr = ib_dma_map_single(ndev->device, c->nvme_cmd, |
| sizeof(*c->nvme_cmd), DMA_FROM_DEVICE); |
| if (ib_dma_mapping_error(ndev->device, c->sge[0].addr)) |
| goto out_free_cmd; |
| |
| c->sge[0].length = sizeof(*c->nvme_cmd); |
| c->sge[0].lkey = ndev->pd->local_dma_lkey; |
| |
| if (!admin) { |
| c->inline_page = alloc_pages(GFP_KERNEL, |
| get_order(NVMET_RDMA_INLINE_DATA_SIZE)); |
| if (!c->inline_page) |
| goto out_unmap_cmd; |
| c->sge[1].addr = ib_dma_map_page(ndev->device, |
| c->inline_page, 0, NVMET_RDMA_INLINE_DATA_SIZE, |
| DMA_FROM_DEVICE); |
| if (ib_dma_mapping_error(ndev->device, c->sge[1].addr)) |
| goto out_free_inline_page; |
| c->sge[1].length = NVMET_RDMA_INLINE_DATA_SIZE; |
| c->sge[1].lkey = ndev->pd->local_dma_lkey; |
| } |
| |
| c->cqe.done = nvmet_rdma_recv_done; |
| |
| c->wr.wr_cqe = &c->cqe; |
| c->wr.sg_list = c->sge; |
| c->wr.num_sge = admin ? 1 : 2; |
| |
| return 0; |
| |
| out_free_inline_page: |
| if (!admin) { |
| __free_pages(c->inline_page, |
| get_order(NVMET_RDMA_INLINE_DATA_SIZE)); |
| } |
| out_unmap_cmd: |
| ib_dma_unmap_single(ndev->device, c->sge[0].addr, |
| sizeof(*c->nvme_cmd), DMA_FROM_DEVICE); |
| out_free_cmd: |
| kfree(c->nvme_cmd); |
| |
| out: |
| return -ENOMEM; |
| } |
| |
| static void nvmet_rdma_free_cmd(struct nvmet_rdma_device *ndev, |
| struct nvmet_rdma_cmd *c, bool admin) |
| { |
| if (!admin) { |
| ib_dma_unmap_page(ndev->device, c->sge[1].addr, |
| NVMET_RDMA_INLINE_DATA_SIZE, DMA_FROM_DEVICE); |
| __free_pages(c->inline_page, |
| get_order(NVMET_RDMA_INLINE_DATA_SIZE)); |
| } |
| ib_dma_unmap_single(ndev->device, c->sge[0].addr, |
| sizeof(*c->nvme_cmd), DMA_FROM_DEVICE); |
| kfree(c->nvme_cmd); |
| } |
| |
| static struct nvmet_rdma_cmd * |
| nvmet_rdma_alloc_cmds(struct nvmet_rdma_device *ndev, |
| int nr_cmds, bool admin) |
| { |
| struct nvmet_rdma_cmd *cmds; |
| int ret = -EINVAL, i; |
| |
| cmds = kcalloc(nr_cmds, sizeof(struct nvmet_rdma_cmd), GFP_KERNEL); |
| if (!cmds) |
| goto out; |
| |
| for (i = 0; i < nr_cmds; i++) { |
| ret = nvmet_rdma_alloc_cmd(ndev, cmds + i, admin); |
| if (ret) |
| goto out_free; |
| } |
| |
| return cmds; |
| |
| out_free: |
| while (--i >= 0) |
| nvmet_rdma_free_cmd(ndev, cmds + i, admin); |
| kfree(cmds); |
| out: |
| return ERR_PTR(ret); |
| } |
| |
| static void nvmet_rdma_free_cmds(struct nvmet_rdma_device *ndev, |
| struct nvmet_rdma_cmd *cmds, int nr_cmds, bool admin) |
| { |
| int i; |
| |
| for (i = 0; i < nr_cmds; i++) |
| nvmet_rdma_free_cmd(ndev, cmds + i, admin); |
| kfree(cmds); |
| } |
| |
| static int nvmet_rdma_alloc_rsp(struct nvmet_rdma_device *ndev, |
| struct nvmet_rdma_rsp *r) |
| { |
| /* NVMe CQE / RDMA SEND */ |
| r->req.rsp = kmalloc(sizeof(*r->req.rsp), GFP_KERNEL); |
| if (!r->req.rsp) |
| goto out; |
| |
| r->send_sge.addr = ib_dma_map_single(ndev->device, r->req.rsp, |
| sizeof(*r->req.rsp), DMA_TO_DEVICE); |
| if (ib_dma_mapping_error(ndev->device, r->send_sge.addr)) |
| goto out_free_rsp; |
| |
| r->send_sge.length = sizeof(*r->req.rsp); |
| r->send_sge.lkey = ndev->pd->local_dma_lkey; |
| |
| r->send_cqe.done = nvmet_rdma_send_done; |
| |
| r->send_wr.wr_cqe = &r->send_cqe; |
| r->send_wr.sg_list = &r->send_sge; |
| r->send_wr.num_sge = 1; |
| r->send_wr.send_flags = IB_SEND_SIGNALED; |
| |
| /* Data In / RDMA READ */ |
| r->read_cqe.done = nvmet_rdma_read_data_done; |
| return 0; |
| |
| out_free_rsp: |
| kfree(r->req.rsp); |
| out: |
| return -ENOMEM; |
| } |
| |
| static void nvmet_rdma_free_rsp(struct nvmet_rdma_device *ndev, |
| struct nvmet_rdma_rsp *r) |
| { |
| ib_dma_unmap_single(ndev->device, r->send_sge.addr, |
| sizeof(*r->req.rsp), DMA_TO_DEVICE); |
| kfree(r->req.rsp); |
| } |
| |
| static int |
| nvmet_rdma_alloc_rsps(struct nvmet_rdma_queue *queue) |
| { |
| struct nvmet_rdma_device *ndev = queue->dev; |
| int nr_rsps = queue->recv_queue_size * 2; |
| int ret = -EINVAL, i; |
| |
| queue->rsps = kcalloc(nr_rsps, sizeof(struct nvmet_rdma_rsp), |
| GFP_KERNEL); |
| if (!queue->rsps) |
| goto out; |
| |
| for (i = 0; i < nr_rsps; i++) { |
| struct nvmet_rdma_rsp *rsp = &queue->rsps[i]; |
| |
| ret = nvmet_rdma_alloc_rsp(ndev, rsp); |
| if (ret) |
| goto out_free; |
| |
| list_add_tail(&rsp->free_list, &queue->free_rsps); |
| } |
| |
| return 0; |
| |
| out_free: |
| while (--i >= 0) { |
| struct nvmet_rdma_rsp *rsp = &queue->rsps[i]; |
| |
| list_del(&rsp->free_list); |
| nvmet_rdma_free_rsp(ndev, rsp); |
| } |
| kfree(queue->rsps); |
| out: |
| return ret; |
| } |
| |
| static void nvmet_rdma_free_rsps(struct nvmet_rdma_queue *queue) |
| { |
| struct nvmet_rdma_device *ndev = queue->dev; |
| int i, nr_rsps = queue->recv_queue_size * 2; |
| |
| for (i = 0; i < nr_rsps; i++) { |
| struct nvmet_rdma_rsp *rsp = &queue->rsps[i]; |
| |
| list_del(&rsp->free_list); |
| nvmet_rdma_free_rsp(ndev, rsp); |
| } |
| kfree(queue->rsps); |
| } |
| |
| static int nvmet_rdma_post_recv(struct nvmet_rdma_device *ndev, |
| struct nvmet_rdma_cmd *cmd) |
| { |
| struct ib_recv_wr *bad_wr; |
| |
| ib_dma_sync_single_for_device(ndev->device, |
| cmd->sge[0].addr, cmd->sge[0].length, |
| DMA_FROM_DEVICE); |
| |
| if (ndev->srq) |
| return ib_post_srq_recv(ndev->srq, &cmd->wr, &bad_wr); |
| return ib_post_recv(cmd->queue->cm_id->qp, &cmd->wr, &bad_wr); |
| } |
| |
| static void nvmet_rdma_process_wr_wait_list(struct nvmet_rdma_queue *queue) |
| { |
| spin_lock(&queue->rsp_wr_wait_lock); |
| while (!list_empty(&queue->rsp_wr_wait_list)) { |
| struct nvmet_rdma_rsp *rsp; |
| bool ret; |
| |
| rsp = list_entry(queue->rsp_wr_wait_list.next, |
| struct nvmet_rdma_rsp, wait_list); |
| list_del(&rsp->wait_list); |
| |
| spin_unlock(&queue->rsp_wr_wait_lock); |
| ret = nvmet_rdma_execute_command(rsp); |
| spin_lock(&queue->rsp_wr_wait_lock); |
| |
| if (!ret) { |
| list_add(&rsp->wait_list, &queue->rsp_wr_wait_list); |
| break; |
| } |
| } |
| spin_unlock(&queue->rsp_wr_wait_lock); |
| } |
| |
| |
| static void nvmet_rdma_release_rsp(struct nvmet_rdma_rsp *rsp) |
| { |
| struct nvmet_rdma_queue *queue = rsp->queue; |
| |
| atomic_add(1 + rsp->n_rdma, &queue->sq_wr_avail); |
| |
| if (rsp->n_rdma) { |
| rdma_rw_ctx_destroy(&rsp->rw, queue->cm_id->qp, |
| queue->cm_id->port_num, rsp->req.sg, |
| rsp->req.sg_cnt, nvmet_data_dir(&rsp->req)); |
| } |
| |
| if (rsp->req.sg != &rsp->cmd->inline_sg) |
| nvmet_rdma_free_sgl(rsp->req.sg, rsp->req.sg_cnt); |
| |
| if (unlikely(!list_empty_careful(&queue->rsp_wr_wait_list))) |
| nvmet_rdma_process_wr_wait_list(queue); |
| |
| nvmet_rdma_put_rsp(rsp); |
| } |
| |
| static void nvmet_rdma_error_comp(struct nvmet_rdma_queue *queue) |
| { |
| if (queue->nvme_sq.ctrl) { |
| nvmet_ctrl_fatal_error(queue->nvme_sq.ctrl); |
| } else { |
| /* |
| * we didn't setup the controller yet in case |
| * of admin connect error, just disconnect and |
| * cleanup the queue |
| */ |
| nvmet_rdma_queue_disconnect(queue); |
| } |
| } |
| |
| static void nvmet_rdma_send_done(struct ib_cq *cq, struct ib_wc *wc) |
| { |
| struct nvmet_rdma_rsp *rsp = |
| container_of(wc->wr_cqe, struct nvmet_rdma_rsp, send_cqe); |
| |
| nvmet_rdma_release_rsp(rsp); |
| |
| if (unlikely(wc->status != IB_WC_SUCCESS && |
| wc->status != IB_WC_WR_FLUSH_ERR)) { |
| pr_err("SEND for CQE 0x%p failed with status %s (%d).\n", |
| wc->wr_cqe, ib_wc_status_msg(wc->status), wc->status); |
| nvmet_rdma_error_comp(rsp->queue); |
| } |
| } |
| |
| static void nvmet_rdma_queue_response(struct nvmet_req *req) |
| { |
| struct nvmet_rdma_rsp *rsp = |
| container_of(req, struct nvmet_rdma_rsp, req); |
| struct rdma_cm_id *cm_id = rsp->queue->cm_id; |
| struct ib_send_wr *first_wr, *bad_wr; |
| |
| if (rsp->flags & NVMET_RDMA_REQ_INVALIDATE_RKEY) { |
| rsp->send_wr.opcode = IB_WR_SEND_WITH_INV; |
| rsp->send_wr.ex.invalidate_rkey = rsp->invalidate_rkey; |
| } else { |
| rsp->send_wr.opcode = IB_WR_SEND; |
| } |
| |
| if (nvmet_rdma_need_data_out(rsp)) |
| first_wr = rdma_rw_ctx_wrs(&rsp->rw, cm_id->qp, |
| cm_id->port_num, NULL, &rsp->send_wr); |
| else |
| first_wr = &rsp->send_wr; |
| |
| nvmet_rdma_post_recv(rsp->queue->dev, rsp->cmd); |
| |
| ib_dma_sync_single_for_device(rsp->queue->dev->device, |
| rsp->send_sge.addr, rsp->send_sge.length, |
| DMA_TO_DEVICE); |
| |
| if (ib_post_send(cm_id->qp, first_wr, &bad_wr)) { |
| pr_err("sending cmd response failed\n"); |
| nvmet_rdma_release_rsp(rsp); |
| } |
| } |
| |
| static void nvmet_rdma_read_data_done(struct ib_cq *cq, struct ib_wc *wc) |
| { |
| struct nvmet_rdma_rsp *rsp = |
| container_of(wc->wr_cqe, struct nvmet_rdma_rsp, read_cqe); |
| struct nvmet_rdma_queue *queue = cq->cq_context; |
| |
| WARN_ON(rsp->n_rdma <= 0); |
| atomic_add(rsp->n_rdma, &queue->sq_wr_avail); |
| rdma_rw_ctx_destroy(&rsp->rw, queue->cm_id->qp, |
| queue->cm_id->port_num, rsp->req.sg, |
| rsp->req.sg_cnt, nvmet_data_dir(&rsp->req)); |
| rsp->n_rdma = 0; |
| |
| if (unlikely(wc->status != IB_WC_SUCCESS)) { |
| nvmet_rdma_release_rsp(rsp); |
| if (wc->status != IB_WC_WR_FLUSH_ERR) { |
| pr_info("RDMA READ for CQE 0x%p failed with status %s (%d).\n", |
| wc->wr_cqe, ib_wc_status_msg(wc->status), wc->status); |
| nvmet_rdma_error_comp(queue); |
| } |
| return; |
| } |
| |
| rsp->req.execute(&rsp->req); |
| } |
| |
| static void nvmet_rdma_use_inline_sg(struct nvmet_rdma_rsp *rsp, u32 len, |
| u64 off) |
| { |
| sg_init_table(&rsp->cmd->inline_sg, 1); |
| sg_set_page(&rsp->cmd->inline_sg, rsp->cmd->inline_page, len, off); |
| rsp->req.sg = &rsp->cmd->inline_sg; |
| rsp->req.sg_cnt = 1; |
| } |
| |
| static u16 nvmet_rdma_map_sgl_inline(struct nvmet_rdma_rsp *rsp) |
| { |
| struct nvme_sgl_desc *sgl = &rsp->req.cmd->common.dptr.sgl; |
| u64 off = le64_to_cpu(sgl->addr); |
| u32 len = le32_to_cpu(sgl->length); |
| |
| if (!nvme_is_write(rsp->req.cmd)) |
| return NVME_SC_INVALID_FIELD | NVME_SC_DNR; |
| |
| if (off + len > NVMET_RDMA_INLINE_DATA_SIZE) { |
| pr_err("invalid inline data offset!\n"); |
| return NVME_SC_SGL_INVALID_OFFSET | NVME_SC_DNR; |
| } |
| |
| /* no data command? */ |
| if (!len) |
| return 0; |
| |
| nvmet_rdma_use_inline_sg(rsp, len, off); |
| rsp->flags |= NVMET_RDMA_REQ_INLINE_DATA; |
| return 0; |
| } |
| |
| static u16 nvmet_rdma_map_sgl_keyed(struct nvmet_rdma_rsp *rsp, |
| struct nvme_keyed_sgl_desc *sgl, bool invalidate) |
| { |
| struct rdma_cm_id *cm_id = rsp->queue->cm_id; |
| u64 addr = le64_to_cpu(sgl->addr); |
| u32 len = get_unaligned_le24(sgl->length); |
| u32 key = get_unaligned_le32(sgl->key); |
| int ret; |
| u16 status; |
| |
| /* no data command? */ |
| if (!len) |
| return 0; |
| |
| status = nvmet_rdma_alloc_sgl(&rsp->req.sg, &rsp->req.sg_cnt, |
| len); |
| if (status) |
| return status; |
| |
| ret = rdma_rw_ctx_init(&rsp->rw, cm_id->qp, cm_id->port_num, |
| rsp->req.sg, rsp->req.sg_cnt, 0, addr, key, |
| nvmet_data_dir(&rsp->req)); |
| if (ret < 0) |
| return NVME_SC_INTERNAL; |
| rsp->n_rdma += ret; |
| |
| if (invalidate) { |
| rsp->invalidate_rkey = key; |
| rsp->flags |= NVMET_RDMA_REQ_INVALIDATE_RKEY; |
| } |
| |
| return 0; |
| } |
| |
| static u16 nvmet_rdma_map_sgl(struct nvmet_rdma_rsp *rsp) |
| { |
| struct nvme_keyed_sgl_desc *sgl = &rsp->req.cmd->common.dptr.ksgl; |
| |
| switch (sgl->type >> 4) { |
| case NVME_SGL_FMT_DATA_DESC: |
| switch (sgl->type & 0xf) { |
| case NVME_SGL_FMT_OFFSET: |
| return nvmet_rdma_map_sgl_inline(rsp); |
| default: |
| pr_err("invalid SGL subtype: %#x\n", sgl->type); |
| return NVME_SC_INVALID_FIELD | NVME_SC_DNR; |
| } |
| case NVME_KEY_SGL_FMT_DATA_DESC: |
| switch (sgl->type & 0xf) { |
| case NVME_SGL_FMT_ADDRESS | NVME_SGL_FMT_INVALIDATE: |
| return nvmet_rdma_map_sgl_keyed(rsp, sgl, true); |
| case NVME_SGL_FMT_ADDRESS: |
| return nvmet_rdma_map_sgl_keyed(rsp, sgl, false); |
| default: |
| pr_err("invalid SGL subtype: %#x\n", sgl->type); |
| return NVME_SC_INVALID_FIELD | NVME_SC_DNR; |
| } |
| default: |
| pr_err("invalid SGL type: %#x\n", sgl->type); |
| return NVME_SC_SGL_INVALID_TYPE | NVME_SC_DNR; |
| } |
| } |
| |
| static bool nvmet_rdma_execute_command(struct nvmet_rdma_rsp *rsp) |
| { |
| struct nvmet_rdma_queue *queue = rsp->queue; |
| |
| if (unlikely(atomic_sub_return(1 + rsp->n_rdma, |
| &queue->sq_wr_avail) < 0)) { |
| pr_debug("IB send queue full (needed %d): queue %u cntlid %u\n", |
| 1 + rsp->n_rdma, queue->idx, |
| queue->nvme_sq.ctrl->cntlid); |
| atomic_add(1 + rsp->n_rdma, &queue->sq_wr_avail); |
| return false; |
| } |
| |
| if (nvmet_rdma_need_data_in(rsp)) { |
| if (rdma_rw_ctx_post(&rsp->rw, queue->cm_id->qp, |
| queue->cm_id->port_num, &rsp->read_cqe, NULL)) |
| nvmet_req_complete(&rsp->req, NVME_SC_DATA_XFER_ERROR); |
| } else { |
| rsp->req.execute(&rsp->req); |
| } |
| |
| return true; |
| } |
| |
| static void nvmet_rdma_handle_command(struct nvmet_rdma_queue *queue, |
| struct nvmet_rdma_rsp *cmd) |
| { |
| u16 status; |
| |
| cmd->queue = queue; |
| cmd->n_rdma = 0; |
| cmd->req.port = queue->port; |
| |
| |
| ib_dma_sync_single_for_cpu(queue->dev->device, |
| cmd->cmd->sge[0].addr, cmd->cmd->sge[0].length, |
| DMA_FROM_DEVICE); |
| ib_dma_sync_single_for_cpu(queue->dev->device, |
| cmd->send_sge.addr, cmd->send_sge.length, |
| DMA_TO_DEVICE); |
| |
| if (!nvmet_req_init(&cmd->req, &queue->nvme_cq, |
| &queue->nvme_sq, &nvmet_rdma_ops)) |
| return; |
| |
| status = nvmet_rdma_map_sgl(cmd); |
| if (status) |
| goto out_err; |
| |
| if (unlikely(!nvmet_rdma_execute_command(cmd))) { |
| spin_lock(&queue->rsp_wr_wait_lock); |
| list_add_tail(&cmd->wait_list, &queue->rsp_wr_wait_list); |
| spin_unlock(&queue->rsp_wr_wait_lock); |
| } |
| |
| return; |
| |
| out_err: |
| nvmet_req_complete(&cmd->req, status); |
| } |
| |
| static void nvmet_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc) |
| { |
| struct nvmet_rdma_cmd *cmd = |
| container_of(wc->wr_cqe, struct nvmet_rdma_cmd, cqe); |
| struct nvmet_rdma_queue *queue = cq->cq_context; |
| struct nvmet_rdma_rsp *rsp; |
| |
| if (unlikely(wc->status != IB_WC_SUCCESS)) { |
| if (wc->status != IB_WC_WR_FLUSH_ERR) { |
| pr_err("RECV for CQE 0x%p failed with status %s (%d)\n", |
| wc->wr_cqe, ib_wc_status_msg(wc->status), |
| wc->status); |
| nvmet_rdma_error_comp(queue); |
| } |
| return; |
| } |
| |
| if (unlikely(wc->byte_len < sizeof(struct nvme_command))) { |
| pr_err("Ctrl Fatal Error: capsule size less than 64 bytes\n"); |
| nvmet_rdma_error_comp(queue); |
| return; |
| } |
| |
| cmd->queue = queue; |
| rsp = nvmet_rdma_get_rsp(queue); |
| rsp->cmd = cmd; |
| rsp->flags = 0; |
| rsp->req.cmd = cmd->nvme_cmd; |
| |
| if (unlikely(queue->state != NVMET_RDMA_Q_LIVE)) { |
| unsigned long flags; |
| |
| spin_lock_irqsave(&queue->state_lock, flags); |
| if (queue->state == NVMET_RDMA_Q_CONNECTING) |
| list_add_tail(&rsp->wait_list, &queue->rsp_wait_list); |
| else |
| nvmet_rdma_put_rsp(rsp); |
| spin_unlock_irqrestore(&queue->state_lock, flags); |
| return; |
| } |
| |
| nvmet_rdma_handle_command(queue, rsp); |
| } |
| |
| static void nvmet_rdma_destroy_srq(struct nvmet_rdma_device *ndev) |
| { |
| if (!ndev->srq) |
| return; |
| |
| nvmet_rdma_free_cmds(ndev, ndev->srq_cmds, ndev->srq_size, false); |
| ib_destroy_srq(ndev->srq); |
| } |
| |
| static int nvmet_rdma_init_srq(struct nvmet_rdma_device *ndev) |
| { |
| struct ib_srq_init_attr srq_attr = { NULL, }; |
| struct ib_srq *srq; |
| size_t srq_size; |
| int ret, i; |
| |
| srq_size = 4095; /* XXX: tune */ |
| |
| srq_attr.attr.max_wr = srq_size; |
| srq_attr.attr.max_sge = 2; |
| srq_attr.attr.srq_limit = 0; |
| srq_attr.srq_type = IB_SRQT_BASIC; |
| srq = ib_create_srq(ndev->pd, &srq_attr); |
| if (IS_ERR(srq)) { |
| /* |
| * If SRQs aren't supported we just go ahead and use normal |
| * non-shared receive queues. |
| */ |
| pr_info("SRQ requested but not supported.\n"); |
| return 0; |
| } |
| |
| ndev->srq_cmds = nvmet_rdma_alloc_cmds(ndev, srq_size, false); |
| if (IS_ERR(ndev->srq_cmds)) { |
| ret = PTR_ERR(ndev->srq_cmds); |
| goto out_destroy_srq; |
| } |
| |
| ndev->srq = srq; |
| ndev->srq_size = srq_size; |
| |
| for (i = 0; i < srq_size; i++) |
| nvmet_rdma_post_recv(ndev, &ndev->srq_cmds[i]); |
| |
| return 0; |
| |
| out_destroy_srq: |
| ib_destroy_srq(srq); |
| return ret; |
| } |
| |
| static void nvmet_rdma_free_dev(struct kref *ref) |
| { |
| struct nvmet_rdma_device *ndev = |
| container_of(ref, struct nvmet_rdma_device, ref); |
| |
| mutex_lock(&device_list_mutex); |
| list_del(&ndev->entry); |
| mutex_unlock(&device_list_mutex); |
| |
| nvmet_rdma_destroy_srq(ndev); |
| ib_dealloc_pd(ndev->pd); |
| |
| kfree(ndev); |
| } |
| |
| static struct nvmet_rdma_device * |
| nvmet_rdma_find_get_device(struct rdma_cm_id *cm_id) |
| { |
| struct nvmet_rdma_device *ndev; |
| int ret; |
| |
| mutex_lock(&device_list_mutex); |
| list_for_each_entry(ndev, &device_list, entry) { |
| if (ndev->device->node_guid == cm_id->device->node_guid && |
| kref_get_unless_zero(&ndev->ref)) |
| goto out_unlock; |
| } |
| |
| ndev = kzalloc(sizeof(*ndev), GFP_KERNEL); |
| if (!ndev) |
| goto out_err; |
| |
| ndev->device = cm_id->device; |
| kref_init(&ndev->ref); |
| |
| ndev->pd = ib_alloc_pd(ndev->device, 0); |
| if (IS_ERR(ndev->pd)) |
| goto out_free_dev; |
| |
| if (nvmet_rdma_use_srq) { |
| ret = nvmet_rdma_init_srq(ndev); |
| if (ret) |
| goto out_free_pd; |
| } |
| |
| list_add(&ndev->entry, &device_list); |
| out_unlock: |
| mutex_unlock(&device_list_mutex); |
| pr_debug("added %s.\n", ndev->device->name); |
| 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 int nvmet_rdma_create_queue_ib(struct nvmet_rdma_queue *queue) |
| { |
| struct ib_qp_init_attr qp_attr; |
| struct nvmet_rdma_device *ndev = queue->dev; |
| int comp_vector, nr_cqe, ret, i; |
| |
| /* |
| * Spread the io queues across completion vectors, |
| * but still keep all admin queues on vector 0. |
| */ |
| comp_vector = !queue->host_qid ? 0 : |
| queue->idx % ndev->device->num_comp_vectors; |
| |
| /* |
| * Reserve CQ slots for RECV + RDMA_READ/RDMA_WRITE + RDMA_SEND. |
| */ |
| nr_cqe = queue->recv_queue_size + 2 * queue->send_queue_size; |
| |
| queue->cq = ib_alloc_cq(ndev->device, queue, |
| nr_cqe + 1, comp_vector, |
| IB_POLL_WORKQUEUE); |
| if (IS_ERR(queue->cq)) { |
| ret = PTR_ERR(queue->cq); |
| pr_err("failed to create CQ cqe= %d ret= %d\n", |
| nr_cqe + 1, ret); |
| goto out; |
| } |
| |
| memset(&qp_attr, 0, sizeof(qp_attr)); |
| qp_attr.qp_context = queue; |
| qp_attr.event_handler = nvmet_rdma_qp_event; |
| qp_attr.send_cq = queue->cq; |
| qp_attr.recv_cq = queue->cq; |
| qp_attr.sq_sig_type = IB_SIGNAL_REQ_WR; |
| qp_attr.qp_type = IB_QPT_RC; |
| /* +1 for drain */ |
| qp_attr.cap.max_send_wr = queue->send_queue_size + 1; |
| qp_attr.cap.max_rdma_ctxs = queue->send_queue_size; |
| qp_attr.cap.max_send_sge = max(ndev->device->attrs.max_sge_rd, |
| ndev->device->attrs.max_sge); |
| |
| if (ndev->srq) { |
| qp_attr.srq = ndev->srq; |
| } else { |
| /* +1 for drain */ |
| qp_attr.cap.max_recv_wr = 1 + queue->recv_queue_size; |
| qp_attr.cap.max_recv_sge = 2; |
| } |
| |
| ret = rdma_create_qp(queue->cm_id, ndev->pd, &qp_attr); |
| if (ret) { |
| pr_err("failed to create_qp ret= %d\n", ret); |
| goto err_destroy_cq; |
| } |
| |
| atomic_set(&queue->sq_wr_avail, qp_attr.cap.max_send_wr); |
| |
| pr_debug("%s: max_cqe= %d max_sge= %d sq_size = %d cm_id= %p\n", |
| __func__, queue->cq->cqe, qp_attr.cap.max_send_sge, |
| qp_attr.cap.max_send_wr, queue->cm_id); |
| |
| if (!ndev->srq) { |
| for (i = 0; i < queue->recv_queue_size; i++) { |
| queue->cmds[i].queue = queue; |
| nvmet_rdma_post_recv(ndev, &queue->cmds[i]); |
| } |
| } |
| |
| out: |
| return ret; |
| |
| err_destroy_cq: |
| ib_free_cq(queue->cq); |
| goto out; |
| } |
| |
| static void nvmet_rdma_destroy_queue_ib(struct nvmet_rdma_queue *queue) |
| { |
| ib_drain_qp(queue->cm_id->qp); |
| rdma_destroy_qp(queue->cm_id); |
| ib_free_cq(queue->cq); |
| } |
| |
| static void nvmet_rdma_free_queue(struct nvmet_rdma_queue *queue) |
| { |
| pr_info("freeing queue %d\n", queue->idx); |
| |
| nvmet_sq_destroy(&queue->nvme_sq); |
| |
| nvmet_rdma_destroy_queue_ib(queue); |
| if (!queue->dev->srq) { |
| nvmet_rdma_free_cmds(queue->dev, queue->cmds, |
| queue->recv_queue_size, |
| !queue->host_qid); |
| } |
| nvmet_rdma_free_rsps(queue); |
| ida_simple_remove(&nvmet_rdma_queue_ida, queue->idx); |
| kfree(queue); |
| } |
| |
| static void nvmet_rdma_release_queue_work(struct work_struct *w) |
| { |
| struct nvmet_rdma_queue *queue = |
| container_of(w, struct nvmet_rdma_queue, release_work); |
| struct rdma_cm_id *cm_id = queue->cm_id; |
| struct nvmet_rdma_device *dev = queue->dev; |
| enum nvmet_rdma_queue_state state = queue->state; |
| |
| nvmet_rdma_free_queue(queue); |
| |
| if (state != NVMET_RDMA_IN_DEVICE_REMOVAL) |
| rdma_destroy_id(cm_id); |
| |
| kref_put(&dev->ref, nvmet_rdma_free_dev); |
| } |
| |
| static int |
| nvmet_rdma_parse_cm_connect_req(struct rdma_conn_param *conn, |
| struct nvmet_rdma_queue *queue) |
| { |
| struct nvme_rdma_cm_req *req; |
| |
| req = (struct nvme_rdma_cm_req *)conn->private_data; |
| if (!req || conn->private_data_len == 0) |
| return NVME_RDMA_CM_INVALID_LEN; |
| |
| if (le16_to_cpu(req->recfmt) != NVME_RDMA_CM_FMT_1_0) |
| return NVME_RDMA_CM_INVALID_RECFMT; |
| |
| queue->host_qid = le16_to_cpu(req->qid); |
| |
| /* |
| * req->hsqsize corresponds to our recv queue size plus 1 |
| * req->hrqsize corresponds to our send queue size |
| */ |
| queue->recv_queue_size = le16_to_cpu(req->hsqsize) + 1; |
| queue->send_queue_size = le16_to_cpu(req->hrqsize); |
| |
| if (!queue->host_qid && queue->recv_queue_size > NVMF_AQ_DEPTH) |
| return NVME_RDMA_CM_INVALID_HSQSIZE; |
| |
| /* XXX: Should we enforce some kind of max for IO queues? */ |
| |
| return 0; |
| } |
| |
| static int nvmet_rdma_cm_reject(struct rdma_cm_id *cm_id, |
| enum nvme_rdma_cm_status status) |
| { |
| struct nvme_rdma_cm_rej rej; |
| |
| rej.recfmt = cpu_to_le16(NVME_RDMA_CM_FMT_1_0); |
| rej.sts = cpu_to_le16(status); |
| |
| return rdma_reject(cm_id, (void *)&rej, sizeof(rej)); |
| } |
| |
| static struct nvmet_rdma_queue * |
| nvmet_rdma_alloc_queue(struct nvmet_rdma_device *ndev, |
| struct rdma_cm_id *cm_id, |
| struct rdma_cm_event *event) |
| { |
| struct nvmet_rdma_queue *queue; |
| int ret; |
| |
| queue = kzalloc(sizeof(*queue), GFP_KERNEL); |
| if (!queue) { |
| ret = NVME_RDMA_CM_NO_RSC; |
| goto out_reject; |
| } |
| |
| ret = nvmet_sq_init(&queue->nvme_sq); |
| if (ret) |
| goto out_free_queue; |
| |
| ret = nvmet_rdma_parse_cm_connect_req(&event->param.conn, queue); |
| if (ret) |
| goto out_destroy_sq; |
| |
| /* |
| * Schedules the actual release because calling rdma_destroy_id from |
| * inside a CM callback would trigger a deadlock. (great API design..) |
| */ |
| INIT_WORK(&queue->release_work, nvmet_rdma_release_queue_work); |
| queue->dev = ndev; |
| queue->cm_id = cm_id; |
| |
| spin_lock_init(&queue->state_lock); |
| queue->state = NVMET_RDMA_Q_CONNECTING; |
| INIT_LIST_HEAD(&queue->rsp_wait_list); |
| INIT_LIST_HEAD(&queue->rsp_wr_wait_list); |
| spin_lock_init(&queue->rsp_wr_wait_lock); |
| INIT_LIST_HEAD(&queue->free_rsps); |
| spin_lock_init(&queue->rsps_lock); |
| INIT_LIST_HEAD(&queue->queue_list); |
| |
| queue->idx = ida_simple_get(&nvmet_rdma_queue_ida, 0, 0, GFP_KERNEL); |
| if (queue->idx < 0) { |
| ret = NVME_RDMA_CM_NO_RSC; |
| goto out_free_queue; |
| } |
| |
| ret = nvmet_rdma_alloc_rsps(queue); |
| if (ret) { |
| ret = NVME_RDMA_CM_NO_RSC; |
| goto out_ida_remove; |
| } |
| |
| if (!ndev->srq) { |
| queue->cmds = nvmet_rdma_alloc_cmds(ndev, |
| queue->recv_queue_size, |
| !queue->host_qid); |
| if (IS_ERR(queue->cmds)) { |
| ret = NVME_RDMA_CM_NO_RSC; |
| goto out_free_responses; |
| } |
| } |
| |
| ret = nvmet_rdma_create_queue_ib(queue); |
| if (ret) { |
| pr_err("%s: creating RDMA queue failed (%d).\n", |
| __func__, ret); |
| ret = NVME_RDMA_CM_NO_RSC; |
| goto out_free_cmds; |
| } |
| |
| return queue; |
| |
| out_free_cmds: |
| if (!ndev->srq) { |
| nvmet_rdma_free_cmds(queue->dev, queue->cmds, |
| queue->recv_queue_size, |
| !queue->host_qid); |
| } |
| out_free_responses: |
| nvmet_rdma_free_rsps(queue); |
| out_ida_remove: |
| ida_simple_remove(&nvmet_rdma_queue_ida, queue->idx); |
| out_destroy_sq: |
| nvmet_sq_destroy(&queue->nvme_sq); |
| out_free_queue: |
| kfree(queue); |
| out_reject: |
| nvmet_rdma_cm_reject(cm_id, ret); |
| return NULL; |
| } |
| |
| static void nvmet_rdma_qp_event(struct ib_event *event, void *priv) |
| { |
| struct nvmet_rdma_queue *queue = priv; |
| |
| switch (event->event) { |
| case IB_EVENT_COMM_EST: |
| rdma_notify(queue->cm_id, event->event); |
| break; |
| default: |
| pr_err("received unrecognized IB QP event %d\n", event->event); |
| break; |
| } |
| } |
| |
| static int nvmet_rdma_cm_accept(struct rdma_cm_id *cm_id, |
| struct nvmet_rdma_queue *queue, |
| struct rdma_conn_param *p) |
| { |
| struct rdma_conn_param param = { }; |
| struct nvme_rdma_cm_rep priv = { }; |
| int ret = -ENOMEM; |
| |
| param.rnr_retry_count = 7; |
| param.flow_control = 1; |
| param.initiator_depth = min_t(u8, p->initiator_depth, |
| queue->dev->device->attrs.max_qp_init_rd_atom); |
| param.private_data = &priv; |
| param.private_data_len = sizeof(priv); |
| priv.recfmt = cpu_to_le16(NVME_RDMA_CM_FMT_1_0); |
| priv.crqsize = cpu_to_le16(queue->recv_queue_size); |
| |
| ret = rdma_accept(cm_id, ¶m); |
| if (ret) |
| pr_err("rdma_accept failed (error code = %d)\n", ret); |
| |
| return ret; |
| } |
| |
| static int nvmet_rdma_queue_connect(struct rdma_cm_id *cm_id, |
| struct rdma_cm_event *event) |
| { |
| struct nvmet_rdma_device *ndev; |
| struct nvmet_rdma_queue *queue; |
| int ret = -EINVAL; |
| |
| ndev = nvmet_rdma_find_get_device(cm_id); |
| if (!ndev) { |
| pr_err("no client data!\n"); |
| nvmet_rdma_cm_reject(cm_id, NVME_RDMA_CM_NO_RSC); |
| return -ECONNREFUSED; |
| } |
| |
| queue = nvmet_rdma_alloc_queue(ndev, cm_id, event); |
| if (!queue) { |
| ret = -ENOMEM; |
| goto put_device; |
| } |
| queue->port = cm_id->context; |
| |
| ret = nvmet_rdma_cm_accept(cm_id, queue, &event->param.conn); |
| if (ret) |
| goto release_queue; |
| |
| mutex_lock(&nvmet_rdma_queue_mutex); |
| list_add_tail(&queue->queue_list, &nvmet_rdma_queue_list); |
| mutex_unlock(&nvmet_rdma_queue_mutex); |
| |
| return 0; |
| |
| release_queue: |
| nvmet_rdma_free_queue(queue); |
| put_device: |
| kref_put(&ndev->ref, nvmet_rdma_free_dev); |
| |
| return ret; |
| } |
| |
| static void nvmet_rdma_queue_established(struct nvmet_rdma_queue *queue) |
| { |
| unsigned long flags; |
| |
| spin_lock_irqsave(&queue->state_lock, flags); |
| if (queue->state != NVMET_RDMA_Q_CONNECTING) { |
| pr_warn("trying to establish a connected queue\n"); |
| goto out_unlock; |
| } |
| queue->state = NVMET_RDMA_Q_LIVE; |
| |
| while (!list_empty(&queue->rsp_wait_list)) { |
| struct nvmet_rdma_rsp *cmd; |
| |
| cmd = list_first_entry(&queue->rsp_wait_list, |
| struct nvmet_rdma_rsp, wait_list); |
| list_del(&cmd->wait_list); |
| |
| spin_unlock_irqrestore(&queue->state_lock, flags); |
| nvmet_rdma_handle_command(queue, cmd); |
| spin_lock_irqsave(&queue->state_lock, flags); |
| } |
| |
| out_unlock: |
| spin_unlock_irqrestore(&queue->state_lock, flags); |
| } |
| |
| static void __nvmet_rdma_queue_disconnect(struct nvmet_rdma_queue *queue) |
| { |
| bool disconnect = false; |
| unsigned long flags; |
| |
| pr_debug("cm_id= %p queue->state= %d\n", queue->cm_id, queue->state); |
| |
| spin_lock_irqsave(&queue->state_lock, flags); |
| switch (queue->state) { |
| case NVMET_RDMA_Q_CONNECTING: |
| case NVMET_RDMA_Q_LIVE: |
| queue->state = NVMET_RDMA_Q_DISCONNECTING; |
| case NVMET_RDMA_IN_DEVICE_REMOVAL: |
| disconnect = true; |
| break; |
| case NVMET_RDMA_Q_DISCONNECTING: |
| break; |
| } |
| spin_unlock_irqrestore(&queue->state_lock, flags); |
| |
| if (disconnect) { |
| rdma_disconnect(queue->cm_id); |
| schedule_work(&queue->release_work); |
| } |
| } |
| |
| static void nvmet_rdma_queue_disconnect(struct nvmet_rdma_queue *queue) |
| { |
| bool disconnect = false; |
| |
| mutex_lock(&nvmet_rdma_queue_mutex); |
| if (!list_empty(&queue->queue_list)) { |
| list_del_init(&queue->queue_list); |
| disconnect = true; |
| } |
| mutex_unlock(&nvmet_rdma_queue_mutex); |
| |
| if (disconnect) |
| __nvmet_rdma_queue_disconnect(queue); |
| } |
| |
| static void nvmet_rdma_queue_connect_fail(struct rdma_cm_id *cm_id, |
| struct nvmet_rdma_queue *queue) |
| { |
| WARN_ON_ONCE(queue->state != NVMET_RDMA_Q_CONNECTING); |
| |
| mutex_lock(&nvmet_rdma_queue_mutex); |
| if (!list_empty(&queue->queue_list)) |
| list_del_init(&queue->queue_list); |
| mutex_unlock(&nvmet_rdma_queue_mutex); |
| |
| pr_err("failed to connect queue %d\n", queue->idx); |
| schedule_work(&queue->release_work); |
| } |
| |
| /** |
| * nvme_rdma_device_removal() - Handle RDMA device removal |
| * @queue: nvmet rdma queue (cm id qp_context) |
| * @addr: nvmet address (cm_id context) |
| * |
| * 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. |
| * |
| * Note that this event can be generated on a normal queue cm_id |
| * and/or a device bound listener cm_id (where in this case |
| * queue will be null). |
| * |
| * we claim ownership on destroying the cm_id. For queues we move |
| * the queue state to NVMET_RDMA_IN_DEVICE_REMOVAL and for port |
| * we nullify the priv to prevent double cm_id destruction and destroying |
| * the cm_id implicitely by returning a non-zero rc to the callout. |
| */ |
| static int nvmet_rdma_device_removal(struct rdma_cm_id *cm_id, |
| struct nvmet_rdma_queue *queue) |
| { |
| unsigned long flags; |
| |
| if (!queue) { |
| struct nvmet_port *port = cm_id->context; |
| |
| /* |
| * This is a listener cm_id. Make sure that |
| * future remove_port won't invoke a double |
| * cm_id destroy. use atomic xchg to make sure |
| * we don't compete with remove_port. |
| */ |
| if (xchg(&port->priv, NULL) != cm_id) |
| return 0; |
| } else { |
| /* |
| * This is a queue cm_id. Make sure that |
| * release queue will not destroy the cm_id |
| * and schedule all ctrl queues removal (only |
| * if the queue is not disconnecting already). |
| */ |
| spin_lock_irqsave(&queue->state_lock, flags); |
| if (queue->state != NVMET_RDMA_Q_DISCONNECTING) |
| queue->state = NVMET_RDMA_IN_DEVICE_REMOVAL; |
| spin_unlock_irqrestore(&queue->state_lock, flags); |
| nvmet_rdma_queue_disconnect(queue); |
| flush_scheduled_work(); |
| } |
| |
| /* |
| * We need to return 1 so that the core will destroy |
| * it's own ID. What a great API design.. |
| */ |
| return 1; |
| } |
| |
| static int nvmet_rdma_cm_handler(struct rdma_cm_id *cm_id, |
| struct rdma_cm_event *event) |
| { |
| struct nvmet_rdma_queue *queue = NULL; |
| int ret = 0; |
| |
| if (cm_id->qp) |
| queue = cm_id->qp->qp_context; |
| |
| pr_debug("%s (%d): status %d id %p\n", |
| rdma_event_msg(event->event), event->event, |
| event->status, cm_id); |
| |
| switch (event->event) { |
| case RDMA_CM_EVENT_CONNECT_REQUEST: |
| ret = nvmet_rdma_queue_connect(cm_id, event); |
| break; |
| case RDMA_CM_EVENT_ESTABLISHED: |
| nvmet_rdma_queue_established(queue); |
| break; |
| case RDMA_CM_EVENT_ADDR_CHANGE: |
| case RDMA_CM_EVENT_DISCONNECTED: |
| case RDMA_CM_EVENT_TIMEWAIT_EXIT: |
| /* |
| * We might end up here when we already freed the qp |
| * which means queue release sequence is in progress, |
| * so don't get in the way... |
| */ |
| if (queue) |
| nvmet_rdma_queue_disconnect(queue); |
| break; |
| case RDMA_CM_EVENT_DEVICE_REMOVAL: |
| ret = nvmet_rdma_device_removal(cm_id, queue); |
| break; |
| case RDMA_CM_EVENT_REJECTED: |
| case RDMA_CM_EVENT_UNREACHABLE: |
| case RDMA_CM_EVENT_CONNECT_ERROR: |
| nvmet_rdma_queue_connect_fail(cm_id, queue); |
| break; |
| default: |
| pr_err("received unrecognized RDMA CM event %d\n", |
| event->event); |
| break; |
| } |
| |
| return ret; |
| } |
| |
| static void nvmet_rdma_delete_ctrl(struct nvmet_ctrl *ctrl) |
| { |
| struct nvmet_rdma_queue *queue; |
| |
| restart: |
| mutex_lock(&nvmet_rdma_queue_mutex); |
| list_for_each_entry(queue, &nvmet_rdma_queue_list, queue_list) { |
| if (queue->nvme_sq.ctrl == ctrl) { |
| list_del_init(&queue->queue_list); |
| mutex_unlock(&nvmet_rdma_queue_mutex); |
| |
| __nvmet_rdma_queue_disconnect(queue); |
| goto restart; |
| } |
| } |
| mutex_unlock(&nvmet_rdma_queue_mutex); |
| } |
| |
| static int nvmet_rdma_add_port(struct nvmet_port *port) |
| { |
| struct rdma_cm_id *cm_id; |
| struct sockaddr_in addr_in; |
| u16 port_in; |
| int ret; |
| |
| switch (port->disc_addr.adrfam) { |
| case NVMF_ADDR_FAMILY_IP4: |
| break; |
| default: |
| pr_err("address family %d not supported\n", |
| port->disc_addr.adrfam); |
| return -EINVAL; |
| } |
| |
| ret = kstrtou16(port->disc_addr.trsvcid, 0, &port_in); |
| if (ret) |
| return ret; |
| |
| addr_in.sin_family = AF_INET; |
| addr_in.sin_addr.s_addr = in_aton(port->disc_addr.traddr); |
| addr_in.sin_port = htons(port_in); |
| |
| cm_id = rdma_create_id(&init_net, nvmet_rdma_cm_handler, port, |
| RDMA_PS_TCP, IB_QPT_RC); |
| if (IS_ERR(cm_id)) { |
| pr_err("CM ID creation failed\n"); |
| return PTR_ERR(cm_id); |
| } |
| |
| ret = rdma_bind_addr(cm_id, (struct sockaddr *)&addr_in); |
| if (ret) { |
| pr_err("binding CM ID to %pISpc failed (%d)\n", &addr_in, ret); |
| goto out_destroy_id; |
| } |
| |
| ret = rdma_listen(cm_id, 128); |
| if (ret) { |
| pr_err("listening to %pISpc failed (%d)\n", &addr_in, ret); |
| goto out_destroy_id; |
| } |
| |
| pr_info("enabling port %d (%pISpc)\n", |
| le16_to_cpu(port->disc_addr.portid), &addr_in); |
| port->priv = cm_id; |
| return 0; |
| |
| out_destroy_id: |
| rdma_destroy_id(cm_id); |
| return ret; |
| } |
| |
| static void nvmet_rdma_remove_port(struct nvmet_port *port) |
| { |
| struct rdma_cm_id *cm_id = xchg(&port->priv, NULL); |
| |
| if (cm_id) |
| rdma_destroy_id(cm_id); |
| } |
| |
| static struct nvmet_fabrics_ops nvmet_rdma_ops = { |
| .owner = THIS_MODULE, |
| .type = NVMF_TRTYPE_RDMA, |
| .sqe_inline_size = NVMET_RDMA_INLINE_DATA_SIZE, |
| .msdbd = 1, |
| .has_keyed_sgls = 1, |
| .add_port = nvmet_rdma_add_port, |
| .remove_port = nvmet_rdma_remove_port, |
| .queue_response = nvmet_rdma_queue_response, |
| .delete_ctrl = nvmet_rdma_delete_ctrl, |
| }; |
| |
| static int __init nvmet_rdma_init(void) |
| { |
| return nvmet_register_transport(&nvmet_rdma_ops); |
| } |
| |
| static void __exit nvmet_rdma_exit(void) |
| { |
| struct nvmet_rdma_queue *queue; |
| |
| nvmet_unregister_transport(&nvmet_rdma_ops); |
| |
| flush_scheduled_work(); |
| |
| mutex_lock(&nvmet_rdma_queue_mutex); |
| while ((queue = list_first_entry_or_null(&nvmet_rdma_queue_list, |
| struct nvmet_rdma_queue, queue_list))) { |
| list_del_init(&queue->queue_list); |
| |
| mutex_unlock(&nvmet_rdma_queue_mutex); |
| __nvmet_rdma_queue_disconnect(queue); |
| mutex_lock(&nvmet_rdma_queue_mutex); |
| } |
| mutex_unlock(&nvmet_rdma_queue_mutex); |
| |
| flush_scheduled_work(); |
| ida_destroy(&nvmet_rdma_queue_ida); |
| } |
| |
| module_init(nvmet_rdma_init); |
| module_exit(nvmet_rdma_exit); |
| |
| MODULE_LICENSE("GPL v2"); |
| MODULE_ALIAS("nvmet-transport-1"); /* 1 == NVMF_TRTYPE_RDMA */ |