| /* |
| * Copyright (c) 2013-2015, Mellanox Technologies. All rights reserved. |
| * |
| * This software is available to you under a choice of one of two |
| * licenses. You may choose to be licensed under the terms of the GNU |
| * General Public License (GPL) Version 2, available from the file |
| * COPYING in the main directory of this source tree, or the |
| * OpenIB.org BSD license below: |
| * |
| * Redistribution and use in source and binary forms, with or |
| * without modification, are permitted provided that the following |
| * conditions are met: |
| * |
| * - Redistributions of source code must retain the above |
| * copyright notice, this list of conditions and the following |
| * disclaimer. |
| * |
| * - Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following |
| * disclaimer in the documentation and/or other materials |
| * provided with the distribution. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
| * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS |
| * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN |
| * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
| * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| * SOFTWARE. |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/mlx5/qp.h> |
| #include <linux/mlx5/srq.h> |
| #include <linux/slab.h> |
| #include <rdma/ib_umem.h> |
| #include <rdma/ib_user_verbs.h> |
| |
| #include "mlx5_ib.h" |
| #include "user.h" |
| |
| /* not supported currently */ |
| static int srq_signature; |
| |
| static void *get_wqe(struct mlx5_ib_srq *srq, int n) |
| { |
| return mlx5_buf_offset(&srq->buf, n << srq->msrq.wqe_shift); |
| } |
| |
| 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_create_srq_mbox_in **in, |
| struct ib_udata *udata, int buf_size, int *inlen) |
| { |
| 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; |
| |
| ucmdlen = |
| (udata->inlen - sizeof(struct ib_uverbs_cmd_hdr) < |
| sizeof(ucmd)) ? (sizeof(ucmd) - |
| sizeof(ucmd.reserved)) : sizeof(ucmd); |
| |
| if (ib_copy_from_udata(&ucmd, udata, ucmdlen)) { |
| mlx5_ib_dbg(dev, "failed copy udata\n"); |
| return -EFAULT; |
| } |
| |
| if (ucmdlen == sizeof(ucmd) && |
| ucmd.reserved != 0) |
| return -EINVAL; |
| |
| 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, &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; |
| } |
| |
| *inlen = sizeof(**in) + sizeof(*(*in)->pas) * ncont; |
| *in = mlx5_vzalloc(*inlen); |
| if (!(*in)) { |
| 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)->ctx.log_pg_sz = page_shift - MLX5_ADAPTER_PAGE_SHIFT; |
| (*in)->ctx.pgoff_cqn = cpu_to_be32(offset << 26); |
| |
| return 0; |
| |
| err_in: |
| kvfree(*in); |
| |
| 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_create_srq_mbox_in **in, int buf_size, |
| int *inlen) |
| { |
| int err; |
| int i; |
| struct mlx5_wqe_srq_next_seg *next; |
| int page_shift; |
| int npages; |
| |
| err = mlx5_db_alloc(dev->mdev, &srq->db); |
| if (err) { |
| mlx5_ib_warn(dev, "alloc dbell rec failed\n"); |
| return err; |
| } |
| |
| if (mlx5_buf_alloc(dev->mdev, buf_size, &srq->buf)) { |
| mlx5_ib_dbg(dev, "buf alloc failed\n"); |
| err = -ENOMEM; |
| goto err_db; |
| } |
| page_shift = srq->buf.page_shift; |
| |
| 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)); |
| } |
| |
| npages = DIV_ROUND_UP(srq->buf.npages, 1 << (page_shift - PAGE_SHIFT)); |
| mlx5_ib_dbg(dev, "buf_size %d, page_shift %d, npages %d, calc npages %d\n", |
| buf_size, page_shift, srq->buf.npages, npages); |
| *inlen = sizeof(**in) + sizeof(*(*in)->pas) * npages; |
| *in = mlx5_vzalloc(*inlen); |
| if (!*in) { |
| err = -ENOMEM; |
| goto err_buf; |
| } |
| mlx5_fill_page_array(&srq->buf, (*in)->pas); |
| |
| srq->wrid = kmalloc(srq->msrq.max * sizeof(u64), GFP_KERNEL); |
| if (!srq->wrid) { |
| mlx5_ib_dbg(dev, "kmalloc failed %lu\n", |
| (unsigned long)(srq->msrq.max * sizeof(u64))); |
| err = -ENOMEM; |
| goto err_in; |
| } |
| srq->wq_sig = !!srq_signature; |
| |
| (*in)->ctx.log_pg_sz = page_shift - MLX5_ADAPTER_PAGE_SHIFT; |
| |
| return 0; |
| |
| err_in: |
| kvfree(*in); |
| |
| err_buf: |
| mlx5_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) |
| { |
| kfree(srq->wrid); |
| mlx5_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; |
| int desc_size; |
| int buf_size; |
| int err; |
| struct mlx5_create_srq_mbox_in *uninitialized_var(in); |
| int uninitialized_var(inlen); |
| int is_xrc; |
| u32 flgs, xrcdn; |
| __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); |
| desc_size = roundup_pow_of_two(desc_size); |
| desc_size = max_t(int, 32, desc_size); |
| 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; |
| mlx5_ib_dbg(dev, "desc_size 0x%x, req wr 0x%x, srq size 0x%x, max_gs 0x%x, max_avail_gather 0x%x\n", |
| desc_size, init_attr->attr.max_wr, srq->msrq.max, srq->msrq.max_gs, |
| srq->msrq.max_avail_gather); |
| |
| if (pd->uobject) |
| err = create_srq_user(pd, srq, &in, udata, buf_size, &inlen); |
| else |
| err = create_srq_kernel(dev, srq, &in, buf_size, &inlen); |
| |
| if (err) { |
| mlx5_ib_warn(dev, "create srq %s failed, err %d\n", |
| pd->uobject ? "user" : "kernel", err); |
| goto err_srq; |
| } |
| |
| is_xrc = (init_attr->srq_type == IB_SRQT_XRC); |
| in->ctx.state_log_sz = ilog2(srq->msrq.max); |
| flgs = ((srq->msrq.wqe_shift - 4) | (is_xrc << 5) | (srq->wq_sig << 7)) << 24; |
| xrcdn = 0; |
| if (is_xrc) { |
| xrcdn = to_mxrcd(init_attr->ext.xrc.xrcd)->xrcdn; |
| in->ctx.pgoff_cqn |= cpu_to_be32(to_mcq(init_attr->ext.xrc.cq)->mcq.cqn); |
| } else if (init_attr->srq_type == IB_SRQT_BASIC) { |
| xrcdn = to_mxrcd(dev->devr.x0)->xrcdn; |
| in->ctx.pgoff_cqn |= cpu_to_be32(to_mcq(dev->devr.c0)->mcq.cqn); |
| } |
| |
| in->ctx.flags_xrcd = cpu_to_be32((flgs & 0xFF000000) | (xrcdn & 0xFFFFFF)); |
| |
| in->ctx.pd = cpu_to_be32(to_mpd(pd)->pdn); |
| in->ctx.db_record = cpu_to_be64(srq->db.dma); |
| err = mlx5_core_create_srq(dev->mdev, &srq->msrq, in, inlen); |
| kvfree(in); |
| 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 (pd->uobject) |
| 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_core_destroy_srq(dev->mdev, &srq->msrq); |
| |
| err_usr_kern_srq: |
| if (pd->uobject) |
| 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_core_arm_srq(dev->mdev, &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_query_srq_mbox_out *out; |
| |
| out = kzalloc(sizeof(*out), GFP_KERNEL); |
| if (!out) |
| return -ENOMEM; |
| |
| ret = mlx5_core_query_srq(dev->mdev, &srq->msrq, out); |
| if (ret) |
| goto out_box; |
| |
| srq_attr->srq_limit = be16_to_cpu(out->ctx.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_core_destroy_srq(dev->mdev, &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, struct ib_recv_wr *wr, |
| 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; |
| unsigned long flags; |
| int err = 0; |
| int nreq; |
| int i; |
| |
| spin_lock_irqsave(&srq->lock, flags); |
| |
| 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); |
| } |
| |
| spin_unlock_irqrestore(&srq->lock, flags); |
| |
| return err; |
| } |