diff options
author | 2015-08-04 12:17:53 -0700 | |
---|---|---|
committer | 2015-08-04 15:44:42 -0700 | |
commit | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch) | |
tree | 1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/drivers/infiniband/hw/mlx4/srq.c | |
parent | 98260f3884f4a202f9ca5eabed40b1354c489b29 (diff) |
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base.
It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:
commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Sat Jul 25 12:13:34 2015 +0200
Prepare v4.1.3-rt3
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.
Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/drivers/infiniband/hw/mlx4/srq.c')
-rw-r--r-- | kernel/drivers/infiniband/hw/mlx4/srq.c | 377 |
1 files changed, 377 insertions, 0 deletions
diff --git a/kernel/drivers/infiniband/hw/mlx4/srq.c b/kernel/drivers/infiniband/hw/mlx4/srq.c new file mode 100644 index 000000000..dce5dfe3a --- /dev/null +++ b/kernel/drivers/infiniband/hw/mlx4/srq.c @@ -0,0 +1,377 @@ +/* + * Copyright (c) 2007 Cisco Systems, Inc. All rights reserved. + * Copyright (c) 2007, 2008 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/mlx4/qp.h> +#include <linux/mlx4/srq.h> +#include <linux/slab.h> + +#include "mlx4_ib.h" +#include "user.h" + +static void *get_wqe(struct mlx4_ib_srq *srq, int n) +{ + return mlx4_buf_offset(&srq->buf, n << srq->msrq.wqe_shift); +} + +static void mlx4_ib_srq_event(struct mlx4_srq *srq, enum mlx4_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 MLX4_EVENT_TYPE_SRQ_LIMIT: + event.event = IB_EVENT_SRQ_LIMIT_REACHED; + break; + case MLX4_EVENT_TYPE_SRQ_CATAS_ERROR: + event.event = IB_EVENT_SRQ_ERR; + break; + default: + pr_warn("Unexpected event type %d " + "on SRQ %06x\n", type, srq->srqn); + return; + } + + ibsrq->event_handler(&event, ibsrq->srq_context); + } +} + +struct ib_srq *mlx4_ib_create_srq(struct ib_pd *pd, + struct ib_srq_init_attr *init_attr, + struct ib_udata *udata) +{ + struct mlx4_ib_dev *dev = to_mdev(pd->device); + struct mlx4_ib_srq *srq; + struct mlx4_wqe_srq_next_seg *next; + struct mlx4_wqe_data_seg *scatter; + u32 cqn; + u16 xrcdn; + int desc_size; + int buf_size; + int err; + int i; + + /* Sanity check SRQ size before proceeding */ + if (init_attr->attr.max_wr >= dev->dev->caps.max_srq_wqes || + init_attr->attr.max_sge > dev->dev->caps.max_srq_sge) + 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 = max(32UL, + roundup_pow_of_two(sizeof (struct mlx4_wqe_srq_next_seg) + + srq->msrq.max_gs * + sizeof (struct mlx4_wqe_data_seg))); + srq->msrq.wqe_shift = ilog2(desc_size); + + buf_size = srq->msrq.max * desc_size; + + if (pd->uobject) { + struct mlx4_ib_create_srq ucmd; + + if (ib_copy_from_udata(&ucmd, udata, sizeof ucmd)) { + err = -EFAULT; + goto err_srq; + } + + srq->umem = ib_umem_get(pd->uobject->context, ucmd.buf_addr, + buf_size, 0, 0); + if (IS_ERR(srq->umem)) { + err = PTR_ERR(srq->umem); + goto err_srq; + } + + err = mlx4_mtt_init(dev->dev, ib_umem_page_count(srq->umem), + ilog2(srq->umem->page_size), &srq->mtt); + if (err) + goto err_buf; + + err = mlx4_ib_umem_write_mtt(dev, &srq->mtt, srq->umem); + if (err) + goto err_mtt; + + err = mlx4_ib_db_map_user(to_mucontext(pd->uobject->context), + ucmd.db_addr, &srq->db); + if (err) + goto err_mtt; + } else { + err = mlx4_db_alloc(dev->dev, &srq->db, 0, GFP_KERNEL); + if (err) + goto err_srq; + + *srq->db.db = 0; + + if (mlx4_buf_alloc(dev->dev, buf_size, PAGE_SIZE * 2, &srq->buf, + GFP_KERNEL)) { + err = -ENOMEM; + goto err_db; + } + + 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)); + + for (scatter = (void *) (next + 1); + (void *) scatter < (void *) next + desc_size; + ++scatter) + scatter->lkey = cpu_to_be32(MLX4_INVALID_LKEY); + } + + err = mlx4_mtt_init(dev->dev, srq->buf.npages, srq->buf.page_shift, + &srq->mtt); + if (err) + goto err_buf; + + err = mlx4_buf_write_mtt(dev->dev, &srq->mtt, &srq->buf, GFP_KERNEL); + if (err) + goto err_mtt; + + srq->wrid = kmalloc(srq->msrq.max * sizeof (u64), GFP_KERNEL); + if (!srq->wrid) { + err = -ENOMEM; + goto err_mtt; + } + } + + cqn = (init_attr->srq_type == IB_SRQT_XRC) ? + to_mcq(init_attr->ext.xrc.cq)->mcq.cqn : 0; + xrcdn = (init_attr->srq_type == IB_SRQT_XRC) ? + to_mxrcd(init_attr->ext.xrc.xrcd)->xrcdn : + (u16) dev->dev->caps.reserved_xrcds; + err = mlx4_srq_alloc(dev->dev, to_mpd(pd)->pdn, cqn, xrcdn, &srq->mtt, + srq->db.dma, &srq->msrq); + if (err) + goto err_wrid; + + srq->msrq.event = mlx4_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))) { + err = -EFAULT; + goto err_wrid; + } + + init_attr->attr.max_wr = srq->msrq.max - 1; + + return &srq->ibsrq; + +err_wrid: + if (pd->uobject) + mlx4_ib_db_unmap_user(to_mucontext(pd->uobject->context), &srq->db); + else + kfree(srq->wrid); + +err_mtt: + mlx4_mtt_cleanup(dev->dev, &srq->mtt); + +err_buf: + if (pd->uobject) + ib_umem_release(srq->umem); + else + mlx4_buf_free(dev->dev, buf_size, &srq->buf); + +err_db: + if (!pd->uobject) + mlx4_db_free(dev->dev, &srq->db); + +err_srq: + kfree(srq); + + return ERR_PTR(err); +} + +int mlx4_ib_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr, + enum ib_srq_attr_mask attr_mask, struct ib_udata *udata) +{ + struct mlx4_ib_dev *dev = to_mdev(ibsrq->device); + struct mlx4_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 = mlx4_srq_arm(dev->dev, &srq->msrq, attr->srq_limit); + mutex_unlock(&srq->mutex); + + if (ret) + return ret; + } + + return 0; +} + +int mlx4_ib_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr) +{ + struct mlx4_ib_dev *dev = to_mdev(ibsrq->device); + struct mlx4_ib_srq *srq = to_msrq(ibsrq); + int ret; + int limit_watermark; + + ret = mlx4_srq_query(dev->dev, &srq->msrq, &limit_watermark); + if (ret) + return ret; + + srq_attr->srq_limit = limit_watermark; + srq_attr->max_wr = srq->msrq.max - 1; + srq_attr->max_sge = srq->msrq.max_gs; + + return 0; +} + +int mlx4_ib_destroy_srq(struct ib_srq *srq) +{ + struct mlx4_ib_dev *dev = to_mdev(srq->device); + struct mlx4_ib_srq *msrq = to_msrq(srq); + + mlx4_srq_free(dev->dev, &msrq->msrq); + mlx4_mtt_cleanup(dev->dev, &msrq->mtt); + + if (srq->uobject) { + mlx4_ib_db_unmap_user(to_mucontext(srq->uobject->context), &msrq->db); + ib_umem_release(msrq->umem); + } else { + kfree(msrq->wrid); + mlx4_buf_free(dev->dev, msrq->msrq.max << msrq->msrq.wqe_shift, + &msrq->buf); + mlx4_db_free(dev->dev, &msrq->db); + } + + kfree(msrq); + + return 0; +} + +void mlx4_ib_free_srq_wqe(struct mlx4_ib_srq *srq, int wqe_index) +{ + struct mlx4_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 mlx4_ib_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr, + struct ib_recv_wr **bad_wr) +{ + struct mlx4_ib_srq *srq = to_msrq(ibsrq); + struct mlx4_wqe_srq_next_seg *next; + struct mlx4_wqe_data_seg *scat; + unsigned long flags; + int err = 0; + int nreq; + int i; + struct mlx4_ib_dev *mdev = to_mdev(ibsrq->device); + + spin_lock_irqsave(&srq->lock, flags); + if (mdev->dev->persist->state & MLX4_DEVICE_STATE_INTERNAL_ERROR) { + err = -EIO; + *bad_wr = wr; + nreq = 0; + 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 mlx4_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_gs) { + scat[i].byte_count = 0; + scat[i].lkey = cpu_to_be32(MLX4_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; +} |