376 lines
9.1 KiB
C
376 lines
9.1 KiB
C
/*
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* Copyright (c) 2006, 2007, 2008, 2009 QLogic Corporation. All rights reserved.
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* Copyright (c) 2005, 2006 PathScale, Inc. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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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 "qib_verbs.h"
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/**
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* qib_post_srq_receive - post a receive on a shared receive queue
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* @ibsrq: the SRQ to post the receive on
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* @wr: the list of work requests to post
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* @bad_wr: A pointer to the first WR to cause a problem is put here
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*
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* This may be called from interrupt context.
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*/
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int qib_post_srq_receive(struct ib_srq *ibsrq, struct ib_recv_wr *wr,
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struct ib_recv_wr **bad_wr)
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{
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struct qib_srq *srq = to_isrq(ibsrq);
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struct qib_rwq *wq;
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unsigned long flags;
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int ret;
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for (; wr; wr = wr->next) {
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struct qib_rwqe *wqe;
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u32 next;
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int i;
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if ((unsigned) wr->num_sge > srq->rq.max_sge) {
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*bad_wr = wr;
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ret = -EINVAL;
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goto bail;
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}
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spin_lock_irqsave(&srq->rq.lock, flags);
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wq = srq->rq.wq;
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next = wq->head + 1;
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if (next >= srq->rq.size)
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next = 0;
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if (next == wq->tail) {
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spin_unlock_irqrestore(&srq->rq.lock, flags);
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*bad_wr = wr;
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ret = -ENOMEM;
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goto bail;
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}
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wqe = get_rwqe_ptr(&srq->rq, wq->head);
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wqe->wr_id = wr->wr_id;
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wqe->num_sge = wr->num_sge;
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for (i = 0; i < wr->num_sge; i++)
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wqe->sg_list[i] = wr->sg_list[i];
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/* Make sure queue entry is written before the head index. */
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smp_wmb();
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wq->head = next;
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spin_unlock_irqrestore(&srq->rq.lock, flags);
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}
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ret = 0;
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bail:
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return ret;
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}
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/**
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* qib_create_srq - create a shared receive queue
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* @ibpd: 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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struct ib_srq *qib_create_srq(struct ib_pd *ibpd,
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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 qib_ibdev *dev = to_idev(ibpd->device);
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struct qib_srq *srq;
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u32 sz;
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struct ib_srq *ret;
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if (srq_init_attr->attr.max_sge == 0 ||
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srq_init_attr->attr.max_sge > ib_qib_max_srq_sges ||
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srq_init_attr->attr.max_wr == 0 ||
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srq_init_attr->attr.max_wr > ib_qib_max_srq_wrs) {
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ret = ERR_PTR(-EINVAL);
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goto done;
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}
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srq = kmalloc(sizeof(*srq), GFP_KERNEL);
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if (!srq) {
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ret = ERR_PTR(-ENOMEM);
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goto done;
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}
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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 qib_rwqe);
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srq->rq.wq = vmalloc_user(sizeof(struct qib_rwq) + srq->rq.size * sz);
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if (!srq->rq.wq) {
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ret = ERR_PTR(-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 qib_mmap() for details.
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*/
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if (udata && udata->outlen >= sizeof(__u64)) {
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int err;
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u32 s = sizeof(struct qib_rwq) + srq->rq.size * sz;
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srq->ip =
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qib_create_mmap_info(dev, s, ibpd->uobject->context,
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srq->rq.wq);
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if (!srq->ip) {
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ret = ERR_PTR(-ENOMEM);
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goto bail_wq;
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}
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err = ib_copy_to_udata(udata, &srq->ip->offset,
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sizeof(srq->ip->offset));
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if (err) {
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ret = ERR_PTR(err);
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goto bail_ip;
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}
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} else
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srq->ip = NULL;
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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->rq.wq->head = 0;
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srq->rq.wq->tail = 0;
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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 == ib_qib_max_srqs) {
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spin_unlock(&dev->n_srqs_lock);
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ret = ERR_PTR(-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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ret = &srq->ibsrq;
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goto done;
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bail_ip:
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kfree(srq->ip);
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bail_wq:
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vfree(srq->rq.wq);
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bail_srq:
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kfree(srq);
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done:
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return ret;
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}
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/**
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* qib_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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int qib_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 qib_srq *srq = to_isrq(ibsrq);
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struct qib_rwq *wq;
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int ret = 0;
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if (attr_mask & IB_SRQ_MAX_WR) {
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struct qib_rwq *owq;
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struct qib_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 > ib_qib_max_srq_wrs) ||
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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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ret = -EINVAL;
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goto bail;
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}
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sz = sizeof(struct qib_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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wq = vmalloc_user(sizeof(struct qib_rwq) + size * sz);
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if (!wq) {
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ret = -ENOMEM;
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goto bail;
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}
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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 =
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(void __user *) (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.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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owq = srq->rq.wq;
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head = owq->head;
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tail = owq->tail;
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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 = wq->wq;
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while (tail != head) {
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struct qib_rwqe *wqe;
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int i;
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wqe = 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 qib_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.wq = wq;
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srq->rq.size = size;
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wq->head = n;
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wq->tail = 0;
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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.lock);
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vfree(owq);
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if (srq->ip) {
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struct qib_mmap_info *ip = srq->ip;
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struct qib_ibdev *dev = to_idev(srq->ibsrq.device);
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u32 s = sizeof(struct qib_rwq) + size * sz;
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qib_update_mmap_info(dev, ip, s, wq);
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/*
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* Return the offset to mmap.
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* See qib_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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goto bail;
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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.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.lock);
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}
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goto bail;
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bail_unlock:
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spin_unlock_irq(&srq->rq.lock);
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bail_free:
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vfree(wq);
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bail:
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return ret;
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}
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int qib_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr)
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{
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struct qib_srq *srq = to_isrq(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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* qib_destroy_srq - destroy a shared receive queue
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* @ibsrq: the SRQ to destroy
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*/
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int qib_destroy_srq(struct ib_srq *ibsrq)
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{
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struct qib_srq *srq = to_isrq(ibsrq);
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struct qib_ibdev *dev = to_idev(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, qib_release_mmap_info);
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else
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vfree(srq->rq.wq);
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kfree(srq);
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return 0;
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}
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