418 lines
9.9 KiB
C
418 lines
9.9 KiB
C
/*
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* Copyright(c) 2016 Intel Corporation.
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*
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* This file is provided under a dual BSD/GPLv2 license. When using or
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* redistributing this file, you may do so under either license.
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*
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* GPL LICENSE SUMMARY
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* BSD LICENSE
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* - Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include <linux/slab.h>
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#include <linux/sched.h>
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#include <linux/rculist.h>
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#include <rdma/rdma_vt.h>
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#include <rdma/rdmavt_qp.h>
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#include "mcast.h"
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/**
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* rvt_driver_mcast - init resources for multicast
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* @rdi: rvt dev struct
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*
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* This is per device that registers with rdmavt
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*/
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void rvt_driver_mcast_init(struct rvt_dev_info *rdi)
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{
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/*
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* Anything that needs setup for multicast on a per driver or per rdi
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* basis should be done in here.
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*/
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spin_lock_init(&rdi->n_mcast_grps_lock);
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}
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/**
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* mcast_qp_alloc - alloc a struct to link a QP to mcast GID struct
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* @qp: the QP to link
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*/
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static struct rvt_mcast_qp *rvt_mcast_qp_alloc(struct rvt_qp *qp)
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{
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struct rvt_mcast_qp *mqp;
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mqp = kmalloc(sizeof(*mqp), GFP_KERNEL);
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if (!mqp)
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goto bail;
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mqp->qp = qp;
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atomic_inc(&qp->refcount);
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bail:
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return mqp;
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}
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static void rvt_mcast_qp_free(struct rvt_mcast_qp *mqp)
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{
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struct rvt_qp *qp = mqp->qp;
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/* Notify hfi1_destroy_qp() if it is waiting. */
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if (atomic_dec_and_test(&qp->refcount))
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wake_up(&qp->wait);
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kfree(mqp);
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}
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/**
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* mcast_alloc - allocate the multicast GID structure
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* @mgid: the multicast GID
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*
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* A list of QPs will be attached to this structure.
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*/
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static struct rvt_mcast *rvt_mcast_alloc(union ib_gid *mgid)
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{
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struct rvt_mcast *mcast;
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mcast = kzalloc(sizeof(*mcast), GFP_KERNEL);
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if (!mcast)
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goto bail;
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mcast->mgid = *mgid;
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INIT_LIST_HEAD(&mcast->qp_list);
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init_waitqueue_head(&mcast->wait);
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atomic_set(&mcast->refcount, 0);
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bail:
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return mcast;
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}
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static void rvt_mcast_free(struct rvt_mcast *mcast)
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{
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struct rvt_mcast_qp *p, *tmp;
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list_for_each_entry_safe(p, tmp, &mcast->qp_list, list)
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rvt_mcast_qp_free(p);
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kfree(mcast);
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}
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/**
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* rvt_mcast_find - search the global table for the given multicast GID
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* @ibp: the IB port structure
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* @mgid: the multicast GID to search for
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*
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* The caller is responsible for decrementing the reference count if found.
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*
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* Return: NULL if not found.
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*/
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struct rvt_mcast *rvt_mcast_find(struct rvt_ibport *ibp, union ib_gid *mgid)
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{
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struct rb_node *n;
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unsigned long flags;
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struct rvt_mcast *found = NULL;
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spin_lock_irqsave(&ibp->lock, flags);
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n = ibp->mcast_tree.rb_node;
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while (n) {
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int ret;
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struct rvt_mcast *mcast;
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mcast = rb_entry(n, struct rvt_mcast, rb_node);
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ret = memcmp(mgid->raw, mcast->mgid.raw,
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sizeof(union ib_gid));
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if (ret < 0) {
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n = n->rb_left;
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} else if (ret > 0) {
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n = n->rb_right;
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} else {
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atomic_inc(&mcast->refcount);
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found = mcast;
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break;
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}
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}
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spin_unlock_irqrestore(&ibp->lock, flags);
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return found;
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}
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EXPORT_SYMBOL(rvt_mcast_find);
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/**
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* mcast_add - insert mcast GID into table and attach QP struct
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* @mcast: the mcast GID table
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* @mqp: the QP to attach
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*
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* Return: zero if both were added. Return EEXIST if the GID was already in
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* the table but the QP was added. Return ESRCH if the QP was already
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* attached and neither structure was added.
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*/
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static int rvt_mcast_add(struct rvt_dev_info *rdi, struct rvt_ibport *ibp,
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struct rvt_mcast *mcast, struct rvt_mcast_qp *mqp)
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{
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struct rb_node **n = &ibp->mcast_tree.rb_node;
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struct rb_node *pn = NULL;
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int ret;
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spin_lock_irq(&ibp->lock);
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while (*n) {
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struct rvt_mcast *tmcast;
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struct rvt_mcast_qp *p;
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pn = *n;
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tmcast = rb_entry(pn, struct rvt_mcast, rb_node);
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ret = memcmp(mcast->mgid.raw, tmcast->mgid.raw,
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sizeof(union ib_gid));
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if (ret < 0) {
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n = &pn->rb_left;
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continue;
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}
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if (ret > 0) {
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n = &pn->rb_right;
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continue;
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}
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/* Search the QP list to see if this is already there. */
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list_for_each_entry_rcu(p, &tmcast->qp_list, list) {
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if (p->qp == mqp->qp) {
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ret = ESRCH;
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goto bail;
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}
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}
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if (tmcast->n_attached ==
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rdi->dparms.props.max_mcast_qp_attach) {
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ret = ENOMEM;
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goto bail;
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}
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tmcast->n_attached++;
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list_add_tail_rcu(&mqp->list, &tmcast->qp_list);
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ret = EEXIST;
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goto bail;
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}
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spin_lock(&rdi->n_mcast_grps_lock);
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if (rdi->n_mcast_grps_allocated == rdi->dparms.props.max_mcast_grp) {
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spin_unlock(&rdi->n_mcast_grps_lock);
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ret = ENOMEM;
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goto bail;
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}
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rdi->n_mcast_grps_allocated++;
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spin_unlock(&rdi->n_mcast_grps_lock);
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mcast->n_attached++;
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list_add_tail_rcu(&mqp->list, &mcast->qp_list);
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atomic_inc(&mcast->refcount);
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rb_link_node(&mcast->rb_node, pn, n);
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rb_insert_color(&mcast->rb_node, &ibp->mcast_tree);
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ret = 0;
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bail:
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spin_unlock_irq(&ibp->lock);
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return ret;
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}
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/**
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* rvt_attach_mcast - attach a qp to a multicast group
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* @ibqp: Infiniband qp
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* @igd: multicast guid
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* @lid: multicast lid
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*
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* Return: 0 on success
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*/
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int rvt_attach_mcast(struct ib_qp *ibqp, union ib_gid *gid, u16 lid)
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{
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struct rvt_qp *qp = ibqp_to_rvtqp(ibqp);
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struct rvt_dev_info *rdi = ib_to_rvt(ibqp->device);
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struct rvt_ibport *ibp = rdi->ports[qp->port_num - 1];
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struct rvt_mcast *mcast;
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struct rvt_mcast_qp *mqp;
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int ret = -ENOMEM;
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if (ibqp->qp_num <= 1 || qp->state == IB_QPS_RESET)
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return -EINVAL;
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/*
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* Allocate data structures since its better to do this outside of
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* spin locks and it will most likely be needed.
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*/
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mcast = rvt_mcast_alloc(gid);
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if (!mcast)
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return -ENOMEM;
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mqp = rvt_mcast_qp_alloc(qp);
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if (!mqp)
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goto bail_mcast;
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switch (rvt_mcast_add(rdi, ibp, mcast, mqp)) {
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case ESRCH:
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/* Neither was used: OK to attach the same QP twice. */
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ret = 0;
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goto bail_mqp;
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case EEXIST: /* The mcast wasn't used */
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ret = 0;
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goto bail_mcast;
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case ENOMEM:
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/* Exceeded the maximum number of mcast groups. */
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ret = -ENOMEM;
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goto bail_mqp;
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default:
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break;
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}
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return 0;
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bail_mqp:
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rvt_mcast_qp_free(mqp);
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bail_mcast:
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rvt_mcast_free(mcast);
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return ret;
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}
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/**
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* rvt_detach_mcast - remove a qp from a multicast group
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* @ibqp: Infiniband qp
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* @igd: multicast guid
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* @lid: multicast lid
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*
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* Return: 0 on success
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*/
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int rvt_detach_mcast(struct ib_qp *ibqp, union ib_gid *gid, u16 lid)
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{
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struct rvt_qp *qp = ibqp_to_rvtqp(ibqp);
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struct rvt_dev_info *rdi = ib_to_rvt(ibqp->device);
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struct rvt_ibport *ibp = rdi->ports[qp->port_num - 1];
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struct rvt_mcast *mcast = NULL;
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struct rvt_mcast_qp *p, *tmp, *delp = NULL;
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struct rb_node *n;
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int last = 0;
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int ret = 0;
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if (ibqp->qp_num <= 1 || qp->state == IB_QPS_RESET)
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return -EINVAL;
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spin_lock_irq(&ibp->lock);
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/* Find the GID in the mcast table. */
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n = ibp->mcast_tree.rb_node;
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while (1) {
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if (!n) {
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spin_unlock_irq(&ibp->lock);
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return -EINVAL;
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}
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mcast = rb_entry(n, struct rvt_mcast, rb_node);
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ret = memcmp(gid->raw, mcast->mgid.raw,
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sizeof(union ib_gid));
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if (ret < 0)
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n = n->rb_left;
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else if (ret > 0)
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n = n->rb_right;
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else
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break;
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}
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/* Search the QP list. */
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list_for_each_entry_safe(p, tmp, &mcast->qp_list, list) {
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if (p->qp != qp)
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continue;
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/*
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* We found it, so remove it, but don't poison the forward
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* link until we are sure there are no list walkers.
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*/
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list_del_rcu(&p->list);
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mcast->n_attached--;
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delp = p;
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/* If this was the last attached QP, remove the GID too. */
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if (list_empty(&mcast->qp_list)) {
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rb_erase(&mcast->rb_node, &ibp->mcast_tree);
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last = 1;
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}
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break;
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}
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spin_unlock_irq(&ibp->lock);
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/* QP not attached */
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if (!delp)
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return -EINVAL;
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/*
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* Wait for any list walkers to finish before freeing the
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* list element.
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*/
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wait_event(mcast->wait, atomic_read(&mcast->refcount) <= 1);
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rvt_mcast_qp_free(delp);
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if (last) {
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atomic_dec(&mcast->refcount);
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wait_event(mcast->wait, !atomic_read(&mcast->refcount));
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rvt_mcast_free(mcast);
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spin_lock_irq(&rdi->n_mcast_grps_lock);
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rdi->n_mcast_grps_allocated--;
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spin_unlock_irq(&rdi->n_mcast_grps_lock);
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}
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return 0;
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}
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/**
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*rvt_mast_tree_empty - determine if any qps are attached to any mcast group
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*@rdi: rvt dev struct
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*
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* Return: in use count
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*/
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int rvt_mcast_tree_empty(struct rvt_dev_info *rdi)
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{
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int i;
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int in_use = 0;
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for (i = 0; i < rdi->dparms.nports; i++)
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if (rdi->ports[i]->mcast_tree.rb_node)
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in_use++;
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return in_use;
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}
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