307 lines
7.3 KiB
C
307 lines
7.3 KiB
C
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// SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause
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/*
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* Copyright(c) 2016 Intel Corporation.
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*/
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#include <linux/err.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include <rdma/uverbs_ioctl.h>
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#include "srq.h"
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#include "vt.h"
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#include "qp.h"
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/**
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* rvt_driver_srq_init - init srq resources on a per driver basis
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* @rdi: rvt dev structure
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*
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* Do any initialization needed when a driver registers with rdmavt.
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*/
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void rvt_driver_srq_init(struct rvt_dev_info *rdi)
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{
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spin_lock_init(&rdi->n_srqs_lock);
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rdi->n_srqs_allocated = 0;
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}
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/**
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* rvt_create_srq - create a shared receive queue
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* @ibsrq: the protection domain of the SRQ to create
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* @srq_init_attr: the attributes of the SRQ
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* @udata: data from libibverbs when creating a user SRQ
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*
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* Return: 0 on success
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*/
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int rvt_create_srq(struct ib_srq *ibsrq, struct ib_srq_init_attr *srq_init_attr,
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struct ib_udata *udata)
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{
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struct rvt_dev_info *dev = ib_to_rvt(ibsrq->device);
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struct rvt_srq *srq = ibsrq_to_rvtsrq(ibsrq);
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u32 sz;
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int ret;
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if (srq_init_attr->srq_type != IB_SRQT_BASIC)
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return -EOPNOTSUPP;
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if (srq_init_attr->attr.max_sge == 0 ||
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srq_init_attr->attr.max_sge > dev->dparms.props.max_srq_sge ||
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srq_init_attr->attr.max_wr == 0 ||
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srq_init_attr->attr.max_wr > dev->dparms.props.max_srq_wr)
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return -EINVAL;
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/*
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* Need to use vmalloc() if we want to support large #s of entries.
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*/
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srq->rq.size = srq_init_attr->attr.max_wr + 1;
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srq->rq.max_sge = srq_init_attr->attr.max_sge;
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sz = sizeof(struct ib_sge) * srq->rq.max_sge +
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sizeof(struct rvt_rwqe);
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if (rvt_alloc_rq(&srq->rq, srq->rq.size * sz,
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dev->dparms.node, udata)) {
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ret = -ENOMEM;
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goto bail_srq;
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}
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/*
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* Return the address of the RWQ as the offset to mmap.
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* See rvt_mmap() for details.
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*/
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if (udata && udata->outlen >= sizeof(__u64)) {
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u32 s = sizeof(struct rvt_rwq) + srq->rq.size * sz;
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srq->ip = rvt_create_mmap_info(dev, s, udata, srq->rq.wq);
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if (IS_ERR(srq->ip)) {
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ret = PTR_ERR(srq->ip);
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goto bail_wq;
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}
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ret = ib_copy_to_udata(udata, &srq->ip->offset,
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sizeof(srq->ip->offset));
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if (ret)
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goto bail_ip;
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}
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/*
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* ib_create_srq() will initialize srq->ibsrq.
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*/
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spin_lock_init(&srq->rq.lock);
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srq->limit = srq_init_attr->attr.srq_limit;
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spin_lock(&dev->n_srqs_lock);
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if (dev->n_srqs_allocated == dev->dparms.props.max_srq) {
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spin_unlock(&dev->n_srqs_lock);
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ret = -ENOMEM;
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goto bail_ip;
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}
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dev->n_srqs_allocated++;
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spin_unlock(&dev->n_srqs_lock);
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if (srq->ip) {
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spin_lock_irq(&dev->pending_lock);
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list_add(&srq->ip->pending_mmaps, &dev->pending_mmaps);
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spin_unlock_irq(&dev->pending_lock);
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}
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return 0;
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bail_ip:
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kfree(srq->ip);
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bail_wq:
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rvt_free_rq(&srq->rq);
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bail_srq:
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return ret;
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}
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/**
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* rvt_modify_srq - modify a shared receive queue
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* @ibsrq: the SRQ to modify
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* @attr: the new attributes of the SRQ
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* @attr_mask: indicates which attributes to modify
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* @udata: user data for libibverbs.so
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*
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* Return: 0 on success
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*/
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int rvt_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
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enum ib_srq_attr_mask attr_mask,
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struct ib_udata *udata)
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{
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struct rvt_srq *srq = ibsrq_to_rvtsrq(ibsrq);
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struct rvt_dev_info *dev = ib_to_rvt(ibsrq->device);
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struct rvt_rq tmp_rq = {};
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int ret = 0;
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if (attr_mask & IB_SRQ_MAX_WR) {
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struct rvt_krwq *okwq = NULL;
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struct rvt_rwq *owq = NULL;
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struct rvt_rwqe *p;
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u32 sz, size, n, head, tail;
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/* Check that the requested sizes are below the limits. */
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if ((attr->max_wr > dev->dparms.props.max_srq_wr) ||
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((attr_mask & IB_SRQ_LIMIT) ?
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attr->srq_limit : srq->limit) > attr->max_wr)
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return -EINVAL;
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sz = sizeof(struct rvt_rwqe) +
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srq->rq.max_sge * sizeof(struct ib_sge);
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size = attr->max_wr + 1;
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if (rvt_alloc_rq(&tmp_rq, size * sz, dev->dparms.node,
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udata))
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return -ENOMEM;
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/* Check that we can write the offset to mmap. */
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if (udata && udata->inlen >= sizeof(__u64)) {
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__u64 offset_addr;
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__u64 offset = 0;
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ret = ib_copy_from_udata(&offset_addr, udata,
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sizeof(offset_addr));
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if (ret)
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goto bail_free;
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udata->outbuf = (void __user *)
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(unsigned long)offset_addr;
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ret = ib_copy_to_udata(udata, &offset,
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sizeof(offset));
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if (ret)
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goto bail_free;
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}
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spin_lock_irq(&srq->rq.kwq->c_lock);
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/*
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* validate head and tail pointer values and compute
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* the number of remaining WQEs.
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*/
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if (udata) {
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owq = srq->rq.wq;
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head = RDMA_READ_UAPI_ATOMIC(owq->head);
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tail = RDMA_READ_UAPI_ATOMIC(owq->tail);
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} else {
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okwq = srq->rq.kwq;
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head = okwq->head;
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tail = okwq->tail;
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}
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if (head >= srq->rq.size || tail >= srq->rq.size) {
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ret = -EINVAL;
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goto bail_unlock;
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}
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n = head;
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if (n < tail)
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n += srq->rq.size - tail;
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else
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n -= tail;
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if (size <= n) {
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ret = -EINVAL;
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goto bail_unlock;
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}
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n = 0;
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p = tmp_rq.kwq->curr_wq;
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while (tail != head) {
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struct rvt_rwqe *wqe;
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int i;
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wqe = rvt_get_rwqe_ptr(&srq->rq, tail);
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p->wr_id = wqe->wr_id;
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p->num_sge = wqe->num_sge;
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for (i = 0; i < wqe->num_sge; i++)
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p->sg_list[i] = wqe->sg_list[i];
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n++;
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p = (struct rvt_rwqe *)((char *)p + sz);
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if (++tail >= srq->rq.size)
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tail = 0;
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}
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srq->rq.kwq = tmp_rq.kwq;
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if (udata) {
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srq->rq.wq = tmp_rq.wq;
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RDMA_WRITE_UAPI_ATOMIC(tmp_rq.wq->head, n);
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RDMA_WRITE_UAPI_ATOMIC(tmp_rq.wq->tail, 0);
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} else {
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tmp_rq.kwq->head = n;
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tmp_rq.kwq->tail = 0;
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}
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srq->rq.size = size;
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if (attr_mask & IB_SRQ_LIMIT)
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srq->limit = attr->srq_limit;
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spin_unlock_irq(&srq->rq.kwq->c_lock);
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vfree(owq);
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kvfree(okwq);
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if (srq->ip) {
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struct rvt_mmap_info *ip = srq->ip;
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struct rvt_dev_info *dev = ib_to_rvt(srq->ibsrq.device);
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u32 s = sizeof(struct rvt_rwq) + size * sz;
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rvt_update_mmap_info(dev, ip, s, tmp_rq.wq);
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/*
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* Return the offset to mmap.
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* See rvt_mmap() for details.
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*/
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if (udata && udata->inlen >= sizeof(__u64)) {
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ret = ib_copy_to_udata(udata, &ip->offset,
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sizeof(ip->offset));
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if (ret)
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return ret;
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}
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/*
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* Put user mapping info onto the pending list
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* unless it already is on the list.
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*/
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spin_lock_irq(&dev->pending_lock);
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if (list_empty(&ip->pending_mmaps))
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list_add(&ip->pending_mmaps,
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&dev->pending_mmaps);
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spin_unlock_irq(&dev->pending_lock);
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}
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} else if (attr_mask & IB_SRQ_LIMIT) {
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spin_lock_irq(&srq->rq.kwq->c_lock);
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if (attr->srq_limit >= srq->rq.size)
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ret = -EINVAL;
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else
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srq->limit = attr->srq_limit;
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spin_unlock_irq(&srq->rq.kwq->c_lock);
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}
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return ret;
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bail_unlock:
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spin_unlock_irq(&srq->rq.kwq->c_lock);
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bail_free:
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rvt_free_rq(&tmp_rq);
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return ret;
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}
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/**
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* rvt_query_srq - query srq data
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* @ibsrq: srq to query
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* @attr: return info in attr
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*
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* Return: always 0
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*/
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int rvt_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr)
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{
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struct rvt_srq *srq = ibsrq_to_rvtsrq(ibsrq);
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attr->max_wr = srq->rq.size - 1;
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attr->max_sge = srq->rq.max_sge;
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attr->srq_limit = srq->limit;
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return 0;
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}
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/**
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* rvt_destroy_srq - destory an srq
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* @ibsrq: srq object to destroy
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* @udata: user data for libibverbs.so
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*/
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int rvt_destroy_srq(struct ib_srq *ibsrq, struct ib_udata *udata)
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{
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struct rvt_srq *srq = ibsrq_to_rvtsrq(ibsrq);
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struct rvt_dev_info *dev = ib_to_rvt(ibsrq->device);
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spin_lock(&dev->n_srqs_lock);
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dev->n_srqs_allocated--;
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spin_unlock(&dev->n_srqs_lock);
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if (srq->ip)
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kref_put(&srq->ip->ref, rvt_release_mmap_info);
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kvfree(srq->rq.kwq);
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return 0;
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}
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