274 lines
6.7 KiB
C
274 lines
6.7 KiB
C
/*
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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/vmalloc.h>
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#include "ipath_verbs.h"
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/**
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* ipath_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: 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 ipath_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 ipath_srq *srq = to_isrq(ibsrq);
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struct ipath_ibdev *dev = to_idev(ibsrq->device);
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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 ipath_rwqe *wqe;
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u32 next;
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int i, j;
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if (wr->num_sge > srq->rq.max_sge) {
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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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spin_lock_irqsave(&srq->rq.lock, flags);
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next = srq->rq.head + 1;
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if (next >= srq->rq.size)
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next = 0;
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if (next == srq->rq.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, srq->rq.head);
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wqe->wr_id = wr->wr_id;
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wqe->sg_list[0].mr = NULL;
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wqe->sg_list[0].vaddr = NULL;
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wqe->sg_list[0].length = 0;
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wqe->sg_list[0].sge_length = 0;
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wqe->length = 0;
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for (i = 0, j = 0; i < wr->num_sge; i++) {
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/* Check LKEY */
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if (to_ipd(srq->ibsrq.pd)->user &&
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wr->sg_list[i].lkey == 0) {
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spin_unlock_irqrestore(&srq->rq.lock,
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flags);
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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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if (wr->sg_list[i].length == 0)
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continue;
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if (!ipath_lkey_ok(&dev->lk_table,
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&wqe->sg_list[j],
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&wr->sg_list[i],
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IB_ACCESS_LOCAL_WRITE)) {
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spin_unlock_irqrestore(&srq->rq.lock,
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flags);
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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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wqe->length += wr->sg_list[i].length;
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j++;
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}
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wqe->num_sge = j;
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srq->rq.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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* ipath_create_srq - create a shared receive queue
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* @ibpd: the protection domain of the SRQ to create
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* @attr: the attributes of the SRQ
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* @udata: not used by the InfiniPath verbs driver
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*/
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struct ib_srq *ipath_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 ipath_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 < 1) {
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ret = ERR_PTR(-EINVAL);
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goto bail;
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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 bail;
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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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sz = sizeof(struct ipath_sge) * srq_init_attr->attr.max_sge +
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sizeof(struct ipath_rwqe);
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srq->rq.wq = vmalloc(srq->rq.size * sz);
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if (!srq->rq.wq) {
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kfree(srq);
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ret = ERR_PTR(-ENOMEM);
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goto bail;
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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->rq.head = 0;
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srq->rq.tail = 0;
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srq->rq.max_sge = srq_init_attr->attr.max_sge;
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srq->limit = srq_init_attr->attr.srq_limit;
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ret = &srq->ibsrq;
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bail:
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return ret;
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}
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/**
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* ipath_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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*/
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int ipath_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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{
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struct ipath_srq *srq = to_isrq(ibsrq);
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unsigned long flags;
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int ret;
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if (attr_mask & IB_SRQ_LIMIT) {
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spin_lock_irqsave(&srq->rq.lock, flags);
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srq->limit = attr->srq_limit;
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spin_unlock_irqrestore(&srq->rq.lock, flags);
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}
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if (attr_mask & IB_SRQ_MAX_WR) {
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u32 size = attr->max_wr + 1;
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struct ipath_rwqe *wq, *p;
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u32 n;
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u32 sz;
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if (attr->max_sge < srq->rq.max_sge) {
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ret = -EINVAL;
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goto bail;
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}
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sz = sizeof(struct ipath_rwqe) +
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attr->max_sge * sizeof(struct ipath_sge);
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wq = vmalloc(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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spin_lock_irqsave(&srq->rq.lock, flags);
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if (srq->rq.head < srq->rq.tail)
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n = srq->rq.size + srq->rq.head - srq->rq.tail;
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else
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n = srq->rq.head - srq->rq.tail;
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if (size <= n || size <= srq->limit) {
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spin_unlock_irqrestore(&srq->rq.lock, flags);
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vfree(wq);
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ret = -EINVAL;
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goto bail;
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}
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n = 0;
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p = wq;
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while (srq->rq.tail != srq->rq.head) {
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struct ipath_rwqe *wqe;
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int i;
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wqe = get_rwqe_ptr(&srq->rq, srq->rq.tail);
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p->wr_id = wqe->wr_id;
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p->length = wqe->length;
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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 ipath_rwqe *)((char *) p + sz);
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if (++srq->rq.tail >= srq->rq.size)
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srq->rq.tail = 0;
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}
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vfree(srq->rq.wq);
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srq->rq.wq = wq;
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srq->rq.size = size;
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srq->rq.head = n;
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srq->rq.tail = 0;
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srq->rq.max_sge = attr->max_sge;
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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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int ipath_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr)
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{
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struct ipath_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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* ipath_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 ipath_destroy_srq(struct ib_srq *ibsrq)
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{
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struct ipath_srq *srq = to_isrq(ibsrq);
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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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