| // SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB |
| /* |
| * Copyright (c) 2013-2018, Mellanox Technologies inc. All rights reserved. |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/mlx5/qp.h> |
| #include <linux/slab.h> |
| #include <rdma/ib_umem.h> |
| #include <rdma/ib_user_verbs.h> |
| #include "mlx5_ib.h" |
| #include "srq.h" |
| |
| static void *get_wqe(struct mlx5_ib_srq *srq, int n) |
| { |
| return mlx5_frag_buf_get_wqe(&srq->fbc, n); |
| } |
| |
| static void mlx5_ib_srq_event(struct mlx5_core_srq *srq, enum mlx5_event type) |
| { |
| struct ib_event event; |
| struct ib_srq *ibsrq = &to_mibsrq(srq)->ibsrq; |
| |
| if (ibsrq->event_handler) { |
| event.device = ibsrq->device; |
| event.element.srq = ibsrq; |
| switch (type) { |
| case MLX5_EVENT_TYPE_SRQ_RQ_LIMIT: |
| event.event = IB_EVENT_SRQ_LIMIT_REACHED; |
| break; |
| case MLX5_EVENT_TYPE_SRQ_CATAS_ERROR: |
| event.event = IB_EVENT_SRQ_ERR; |
| break; |
| default: |
| pr_warn("mlx5_ib: Unexpected event type %d on SRQ %06x\n", |
| type, srq->srqn); |
| return; |
| } |
| |
| ibsrq->event_handler(&event, ibsrq->srq_context); |
| } |
| } |
| |
| static int create_srq_user(struct ib_pd *pd, struct mlx5_ib_srq *srq, |
| struct mlx5_srq_attr *in, |
| struct ib_udata *udata, int buf_size) |
| { |
| struct mlx5_ib_dev *dev = to_mdev(pd->device); |
| struct mlx5_ib_create_srq ucmd = {}; |
| size_t ucmdlen; |
| int err; |
| int npages; |
| int page_shift; |
| int ncont; |
| u32 offset; |
| u32 uidx = MLX5_IB_DEFAULT_UIDX; |
| |
| ucmdlen = min(udata->inlen, sizeof(ucmd)); |
| |
| if (ib_copy_from_udata(&ucmd, udata, ucmdlen)) { |
| mlx5_ib_dbg(dev, "failed copy udata\n"); |
| return -EFAULT; |
| } |
| |
| if (ucmd.reserved0 || ucmd.reserved1) |
| return -EINVAL; |
| |
| if (udata->inlen > sizeof(ucmd) && |
| !ib_is_udata_cleared(udata, sizeof(ucmd), |
| udata->inlen - sizeof(ucmd))) |
| return -EINVAL; |
| |
| if (in->type != IB_SRQT_BASIC) { |
| err = get_srq_user_index(to_mucontext(pd->uobject->context), |
| &ucmd, udata->inlen, &uidx); |
| if (err) |
| return err; |
| } |
| |
| srq->wq_sig = !!(ucmd.flags & MLX5_SRQ_FLAG_SIGNATURE); |
| |
| srq->umem = ib_umem_get(pd->uobject->context, ucmd.buf_addr, buf_size, |
| 0, 0); |
| if (IS_ERR(srq->umem)) { |
| mlx5_ib_dbg(dev, "failed umem get, size %d\n", buf_size); |
| err = PTR_ERR(srq->umem); |
| return err; |
| } |
| |
| mlx5_ib_cont_pages(srq->umem, ucmd.buf_addr, 0, &npages, |
| &page_shift, &ncont, NULL); |
| err = mlx5_ib_get_buf_offset(ucmd.buf_addr, page_shift, |
| &offset); |
| if (err) { |
| mlx5_ib_warn(dev, "bad offset\n"); |
| goto err_umem; |
| } |
| |
| in->pas = kvcalloc(ncont, sizeof(*in->pas), GFP_KERNEL); |
| if (!in->pas) { |
| err = -ENOMEM; |
| goto err_umem; |
| } |
| |
| mlx5_ib_populate_pas(dev, srq->umem, page_shift, in->pas, 0); |
| |
| err = mlx5_ib_db_map_user(to_mucontext(pd->uobject->context), |
| ucmd.db_addr, &srq->db); |
| if (err) { |
| mlx5_ib_dbg(dev, "map doorbell failed\n"); |
| goto err_in; |
| } |
| |
| in->log_page_size = page_shift - MLX5_ADAPTER_PAGE_SHIFT; |
| in->page_offset = offset; |
| in->uid = (in->type != IB_SRQT_XRC) ? to_mpd(pd)->uid : 0; |
| if (MLX5_CAP_GEN(dev->mdev, cqe_version) == MLX5_CQE_VERSION_V1 && |
| in->type != IB_SRQT_BASIC) |
| in->user_index = uidx; |
| |
| return 0; |
| |
| err_in: |
| kvfree(in->pas); |
| |
| err_umem: |
| ib_umem_release(srq->umem); |
| |
| return err; |
| } |
| |
| static int create_srq_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_srq *srq, |
| struct mlx5_srq_attr *in, int buf_size) |
| { |
| int err; |
| int i; |
| struct mlx5_wqe_srq_next_seg *next; |
| |
| err = mlx5_db_alloc(dev->mdev, &srq->db); |
| if (err) { |
| mlx5_ib_warn(dev, "alloc dbell rec failed\n"); |
| return err; |
| } |
| |
| if (mlx5_frag_buf_alloc_node(dev->mdev, buf_size, &srq->buf, |
| dev->mdev->priv.numa_node)) { |
| mlx5_ib_dbg(dev, "buf alloc failed\n"); |
| err = -ENOMEM; |
| goto err_db; |
| } |
| |
| mlx5_init_fbc(srq->buf.frags, srq->msrq.wqe_shift, ilog2(srq->msrq.max), |
| &srq->fbc); |
| |
| srq->head = 0; |
| srq->tail = srq->msrq.max - 1; |
| srq->wqe_ctr = 0; |
| |
| for (i = 0; i < srq->msrq.max; i++) { |
| next = get_wqe(srq, i); |
| next->next_wqe_index = |
| cpu_to_be16((i + 1) & (srq->msrq.max - 1)); |
| } |
| |
| mlx5_ib_dbg(dev, "srq->buf.page_shift = %d\n", srq->buf.page_shift); |
| in->pas = kvcalloc(srq->buf.npages, sizeof(*in->pas), GFP_KERNEL); |
| if (!in->pas) { |
| err = -ENOMEM; |
| goto err_buf; |
| } |
| mlx5_fill_page_frag_array(&srq->buf, in->pas); |
| |
| srq->wrid = kvmalloc_array(srq->msrq.max, sizeof(u64), GFP_KERNEL); |
| if (!srq->wrid) { |
| err = -ENOMEM; |
| goto err_in; |
| } |
| srq->wq_sig = 0; |
| |
| in->log_page_size = srq->buf.page_shift - MLX5_ADAPTER_PAGE_SHIFT; |
| if (MLX5_CAP_GEN(dev->mdev, cqe_version) == MLX5_CQE_VERSION_V1 && |
| in->type != IB_SRQT_BASIC) |
| in->user_index = MLX5_IB_DEFAULT_UIDX; |
| |
| return 0; |
| |
| err_in: |
| kvfree(in->pas); |
| |
| err_buf: |
| mlx5_frag_buf_free(dev->mdev, &srq->buf); |
| |
| err_db: |
| mlx5_db_free(dev->mdev, &srq->db); |
| return err; |
| } |
| |
| static void destroy_srq_user(struct ib_pd *pd, struct mlx5_ib_srq *srq) |
| { |
| mlx5_ib_db_unmap_user(to_mucontext(pd->uobject->context), &srq->db); |
| ib_umem_release(srq->umem); |
| } |
| |
| |
| static void destroy_srq_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_srq *srq) |
| { |
| kvfree(srq->wrid); |
| mlx5_frag_buf_free(dev->mdev, &srq->buf); |
| mlx5_db_free(dev->mdev, &srq->db); |
| } |
| |
| struct ib_srq *mlx5_ib_create_srq(struct ib_pd *pd, |
| struct ib_srq_init_attr *init_attr, |
| struct ib_udata *udata) |
| { |
| struct mlx5_ib_dev *dev = to_mdev(pd->device); |
| struct mlx5_ib_srq *srq; |
| size_t desc_size; |
| size_t buf_size; |
| int err; |
| struct mlx5_srq_attr in = {0}; |
| __u32 max_srq_wqes = 1 << MLX5_CAP_GEN(dev->mdev, log_max_srq_sz); |
| |
| /* Sanity check SRQ size before proceeding */ |
| if (init_attr->attr.max_wr >= max_srq_wqes) { |
| mlx5_ib_dbg(dev, "max_wr %d, cap %d\n", |
| init_attr->attr.max_wr, |
| max_srq_wqes); |
| return ERR_PTR(-EINVAL); |
| } |
| |
| srq = kmalloc(sizeof(*srq), GFP_KERNEL); |
| if (!srq) |
| return ERR_PTR(-ENOMEM); |
| |
| mutex_init(&srq->mutex); |
| spin_lock_init(&srq->lock); |
| srq->msrq.max = roundup_pow_of_two(init_attr->attr.max_wr + 1); |
| srq->msrq.max_gs = init_attr->attr.max_sge; |
| |
| desc_size = sizeof(struct mlx5_wqe_srq_next_seg) + |
| srq->msrq.max_gs * sizeof(struct mlx5_wqe_data_seg); |
| if (desc_size == 0 || srq->msrq.max_gs > desc_size) { |
| err = -EINVAL; |
| goto err_srq; |
| } |
| desc_size = roundup_pow_of_two(desc_size); |
| desc_size = max_t(size_t, 32, desc_size); |
| if (desc_size < sizeof(struct mlx5_wqe_srq_next_seg)) { |
| err = -EINVAL; |
| goto err_srq; |
| } |
| srq->msrq.max_avail_gather = (desc_size - sizeof(struct mlx5_wqe_srq_next_seg)) / |
| sizeof(struct mlx5_wqe_data_seg); |
| srq->msrq.wqe_shift = ilog2(desc_size); |
| buf_size = srq->msrq.max * desc_size; |
| if (buf_size < desc_size) { |
| err = -EINVAL; |
| goto err_srq; |
| } |
| in.type = init_attr->srq_type; |
| |
| if (udata) |
| err = create_srq_user(pd, srq, &in, udata, buf_size); |
| else |
| err = create_srq_kernel(dev, srq, &in, buf_size); |
| |
| if (err) { |
| mlx5_ib_warn(dev, "create srq %s failed, err %d\n", |
| udata ? "user" : "kernel", err); |
| goto err_srq; |
| } |
| |
| in.log_size = ilog2(srq->msrq.max); |
| in.wqe_shift = srq->msrq.wqe_shift - 4; |
| if (srq->wq_sig) |
| in.flags |= MLX5_SRQ_FLAG_WQ_SIG; |
| |
| if (init_attr->srq_type == IB_SRQT_XRC) |
| in.xrcd = to_mxrcd(init_attr->ext.xrc.xrcd)->xrcdn; |
| else |
| in.xrcd = to_mxrcd(dev->devr.x0)->xrcdn; |
| |
| if (init_attr->srq_type == IB_SRQT_TM) { |
| in.tm_log_list_size = |
| ilog2(init_attr->ext.tag_matching.max_num_tags) + 1; |
| if (in.tm_log_list_size > |
| MLX5_CAP_GEN(dev->mdev, log_tag_matching_list_sz)) { |
| mlx5_ib_dbg(dev, "TM SRQ max_num_tags exceeding limit\n"); |
| err = -EINVAL; |
| goto err_usr_kern_srq; |
| } |
| in.flags |= MLX5_SRQ_FLAG_RNDV; |
| } |
| |
| if (ib_srq_has_cq(init_attr->srq_type)) |
| in.cqn = to_mcq(init_attr->ext.cq)->mcq.cqn; |
| else |
| in.cqn = to_mcq(dev->devr.c0)->mcq.cqn; |
| |
| in.pd = to_mpd(pd)->pdn; |
| in.db_record = srq->db.dma; |
| err = mlx5_cmd_create_srq(dev, &srq->msrq, &in); |
| kvfree(in.pas); |
| if (err) { |
| mlx5_ib_dbg(dev, "create SRQ failed, err %d\n", err); |
| goto err_usr_kern_srq; |
| } |
| |
| mlx5_ib_dbg(dev, "create SRQ with srqn 0x%x\n", srq->msrq.srqn); |
| |
| srq->msrq.event = mlx5_ib_srq_event; |
| srq->ibsrq.ext.xrc.srq_num = srq->msrq.srqn; |
| |
| if (udata) |
| if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof(__u32))) { |
| mlx5_ib_dbg(dev, "copy to user failed\n"); |
| err = -EFAULT; |
| goto err_core; |
| } |
| |
| init_attr->attr.max_wr = srq->msrq.max - 1; |
| |
| return &srq->ibsrq; |
| |
| err_core: |
| mlx5_cmd_destroy_srq(dev, &srq->msrq); |
| |
| err_usr_kern_srq: |
| if (udata) |
| destroy_srq_user(pd, srq); |
| else |
| destroy_srq_kernel(dev, srq); |
| |
| err_srq: |
| kfree(srq); |
| |
| return ERR_PTR(err); |
| } |
| |
| int mlx5_ib_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr, |
| enum ib_srq_attr_mask attr_mask, struct ib_udata *udata) |
| { |
| struct mlx5_ib_dev *dev = to_mdev(ibsrq->device); |
| struct mlx5_ib_srq *srq = to_msrq(ibsrq); |
| int ret; |
| |
| /* We don't support resizing SRQs yet */ |
| if (attr_mask & IB_SRQ_MAX_WR) |
| return -EINVAL; |
| |
| if (attr_mask & IB_SRQ_LIMIT) { |
| if (attr->srq_limit >= srq->msrq.max) |
| return -EINVAL; |
| |
| mutex_lock(&srq->mutex); |
| ret = mlx5_cmd_arm_srq(dev, &srq->msrq, attr->srq_limit, 1); |
| mutex_unlock(&srq->mutex); |
| |
| if (ret) |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| int mlx5_ib_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr) |
| { |
| struct mlx5_ib_dev *dev = to_mdev(ibsrq->device); |
| struct mlx5_ib_srq *srq = to_msrq(ibsrq); |
| int ret; |
| struct mlx5_srq_attr *out; |
| |
| out = kzalloc(sizeof(*out), GFP_KERNEL); |
| if (!out) |
| return -ENOMEM; |
| |
| ret = mlx5_cmd_query_srq(dev, &srq->msrq, out); |
| if (ret) |
| goto out_box; |
| |
| srq_attr->srq_limit = out->lwm; |
| srq_attr->max_wr = srq->msrq.max - 1; |
| srq_attr->max_sge = srq->msrq.max_gs; |
| |
| out_box: |
| kfree(out); |
| return ret; |
| } |
| |
| int mlx5_ib_destroy_srq(struct ib_srq *srq) |
| { |
| struct mlx5_ib_dev *dev = to_mdev(srq->device); |
| struct mlx5_ib_srq *msrq = to_msrq(srq); |
| |
| mlx5_cmd_destroy_srq(dev, &msrq->msrq); |
| |
| if (srq->uobject) { |
| mlx5_ib_db_unmap_user(to_mucontext(srq->uobject->context), &msrq->db); |
| ib_umem_release(msrq->umem); |
| } else { |
| destroy_srq_kernel(dev, msrq); |
| } |
| |
| kfree(srq); |
| return 0; |
| } |
| |
| void mlx5_ib_free_srq_wqe(struct mlx5_ib_srq *srq, int wqe_index) |
| { |
| struct mlx5_wqe_srq_next_seg *next; |
| |
| /* always called with interrupts disabled. */ |
| spin_lock(&srq->lock); |
| |
| next = get_wqe(srq, srq->tail); |
| next->next_wqe_index = cpu_to_be16(wqe_index); |
| srq->tail = wqe_index; |
| |
| spin_unlock(&srq->lock); |
| } |
| |
| int mlx5_ib_post_srq_recv(struct ib_srq *ibsrq, const struct ib_recv_wr *wr, |
| const struct ib_recv_wr **bad_wr) |
| { |
| struct mlx5_ib_srq *srq = to_msrq(ibsrq); |
| struct mlx5_wqe_srq_next_seg *next; |
| struct mlx5_wqe_data_seg *scat; |
| struct mlx5_ib_dev *dev = to_mdev(ibsrq->device); |
| struct mlx5_core_dev *mdev = dev->mdev; |
| unsigned long flags; |
| int err = 0; |
| int nreq; |
| int i; |
| |
| spin_lock_irqsave(&srq->lock, flags); |
| |
| if (mdev->state == MLX5_DEVICE_STATE_INTERNAL_ERROR) { |
| err = -EIO; |
| *bad_wr = wr; |
| goto out; |
| } |
| |
| for (nreq = 0; wr; nreq++, wr = wr->next) { |
| if (unlikely(wr->num_sge > srq->msrq.max_gs)) { |
| err = -EINVAL; |
| *bad_wr = wr; |
| break; |
| } |
| |
| if (unlikely(srq->head == srq->tail)) { |
| err = -ENOMEM; |
| *bad_wr = wr; |
| break; |
| } |
| |
| srq->wrid[srq->head] = wr->wr_id; |
| |
| next = get_wqe(srq, srq->head); |
| srq->head = be16_to_cpu(next->next_wqe_index); |
| scat = (struct mlx5_wqe_data_seg *)(next + 1); |
| |
| for (i = 0; i < wr->num_sge; i++) { |
| scat[i].byte_count = cpu_to_be32(wr->sg_list[i].length); |
| scat[i].lkey = cpu_to_be32(wr->sg_list[i].lkey); |
| scat[i].addr = cpu_to_be64(wr->sg_list[i].addr); |
| } |
| |
| if (i < srq->msrq.max_avail_gather) { |
| scat[i].byte_count = 0; |
| scat[i].lkey = cpu_to_be32(MLX5_INVALID_LKEY); |
| scat[i].addr = 0; |
| } |
| } |
| |
| if (likely(nreq)) { |
| srq->wqe_ctr += nreq; |
| |
| /* Make sure that descriptors are written before |
| * doorbell record. |
| */ |
| wmb(); |
| |
| *srq->db.db = cpu_to_be32(srq->wqe_ctr); |
| } |
| out: |
| spin_unlock_irqrestore(&srq->lock, flags); |
| |
| return err; |
| } |