+++ /dev/null
-/*
- *
- * This file is provided under a dual BSD/GPLv2 license. When using or
- * redistributing this file, you may do so under either license.
- *
- * GPL LICENSE SUMMARY
- *
- * Copyright(c) 2015 Intel Corporation.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of version 2 of the GNU General Public License as
- * published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * BSD LICENSE
- *
- * Copyright(c) 2015 Intel Corporation.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * - Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * - Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- * - Neither the name of Intel Corporation nor the names of its
- * contributors may be used to endorse or promote products derived
- * from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- */
-
-#include <linux/rculist.h>
-
-#include "hfi.h"
-
-/**
- * mcast_qp_alloc - alloc a struct to link a QP to mcast GID struct
- * @qp: the QP to link
- */
-static struct hfi1_mcast_qp *mcast_qp_alloc(struct rvt_qp *qp)
-{
- struct hfi1_mcast_qp *mqp;
-
- mqp = kmalloc(sizeof(*mqp), GFP_KERNEL);
- if (!mqp)
- goto bail;
-
- mqp->qp = qp;
- atomic_inc(&qp->refcount);
-
-bail:
- return mqp;
-}
-
-static void mcast_qp_free(struct hfi1_mcast_qp *mqp)
-{
- struct rvt_qp *qp = mqp->qp;
-
- /* Notify hfi1_destroy_qp() if it is waiting. */
- if (atomic_dec_and_test(&qp->refcount))
- wake_up(&qp->wait);
-
- kfree(mqp);
-}
-
-/**
- * mcast_alloc - allocate the multicast GID structure
- * @mgid: the multicast GID
- *
- * A list of QPs will be attached to this structure.
- */
-static struct hfi1_mcast *mcast_alloc(union ib_gid *mgid)
-{
- struct hfi1_mcast *mcast;
-
- mcast = kmalloc(sizeof(*mcast), GFP_KERNEL);
- if (!mcast)
- goto bail;
-
- mcast->mgid = *mgid;
- INIT_LIST_HEAD(&mcast->qp_list);
- init_waitqueue_head(&mcast->wait);
- atomic_set(&mcast->refcount, 0);
- mcast->n_attached = 0;
-
-bail:
- return mcast;
-}
-
-static void mcast_free(struct hfi1_mcast *mcast)
-{
- struct hfi1_mcast_qp *p, *tmp;
-
- list_for_each_entry_safe(p, tmp, &mcast->qp_list, list)
- mcast_qp_free(p);
-
- kfree(mcast);
-}
-
-/**
- * hfi1_mcast_find - search the global table for the given multicast GID
- * @ibp: the IB port structure
- * @mgid: the multicast GID to search for
- *
- * Returns NULL if not found.
- *
- * The caller is responsible for decrementing the reference count if found.
- */
-struct hfi1_mcast *hfi1_mcast_find(struct hfi1_ibport *ibp, union ib_gid *mgid)
-{
- struct rb_node *n;
- unsigned long flags;
- struct hfi1_mcast *mcast;
-
- spin_lock_irqsave(&ibp->rvp.lock, flags);
- n = ibp->rvp.mcast_tree.rb_node;
- while (n) {
- int ret;
-
- mcast = rb_entry(n, struct hfi1_mcast, rb_node);
-
- ret = memcmp(mgid->raw, mcast->mgid.raw,
- sizeof(union ib_gid));
- if (ret < 0)
- n = n->rb_left;
- else if (ret > 0)
- n = n->rb_right;
- else {
- atomic_inc(&mcast->refcount);
- spin_unlock_irqrestore(&ibp->rvp.lock, flags);
- goto bail;
- }
- }
- spin_unlock_irqrestore(&ibp->rvp.lock, flags);
-
- mcast = NULL;
-
-bail:
- return mcast;
-}
-
-/**
- * mcast_add - insert mcast GID into table and attach QP struct
- * @mcast: the mcast GID table
- * @mqp: the QP to attach
- *
- * Return zero if both were added. Return EEXIST if the GID was already in
- * the table but the QP was added. Return ESRCH if the QP was already
- * attached and neither structure was added.
- */
-static int mcast_add(struct hfi1_ibdev *dev, struct hfi1_ibport *ibp,
- struct hfi1_mcast *mcast, struct hfi1_mcast_qp *mqp)
-{
- struct rb_node **n = &ibp->rvp.mcast_tree.rb_node;
- struct rb_node *pn = NULL;
- int ret;
-
- spin_lock_irq(&ibp->rvp.lock);
-
- while (*n) {
- struct hfi1_mcast *tmcast;
- struct hfi1_mcast_qp *p;
-
- pn = *n;
- tmcast = rb_entry(pn, struct hfi1_mcast, rb_node);
-
- ret = memcmp(mcast->mgid.raw, tmcast->mgid.raw,
- sizeof(union ib_gid));
- if (ret < 0) {
- n = &pn->rb_left;
- continue;
- }
- if (ret > 0) {
- n = &pn->rb_right;
- continue;
- }
-
- /* Search the QP list to see if this is already there. */
- list_for_each_entry_rcu(p, &tmcast->qp_list, list) {
- if (p->qp == mqp->qp) {
- ret = ESRCH;
- goto bail;
- }
- }
- if (tmcast->n_attached == hfi1_max_mcast_qp_attached) {
- ret = ENOMEM;
- goto bail;
- }
-
- tmcast->n_attached++;
-
- list_add_tail_rcu(&mqp->list, &tmcast->qp_list);
- ret = EEXIST;
- goto bail;
- }
-
- spin_lock(&dev->n_mcast_grps_lock);
- if (dev->n_mcast_grps_allocated == hfi1_max_mcast_grps) {
- spin_unlock(&dev->n_mcast_grps_lock);
- ret = ENOMEM;
- goto bail;
- }
-
- dev->n_mcast_grps_allocated++;
- spin_unlock(&dev->n_mcast_grps_lock);
-
- mcast->n_attached++;
-
- list_add_tail_rcu(&mqp->list, &mcast->qp_list);
-
- atomic_inc(&mcast->refcount);
- rb_link_node(&mcast->rb_node, pn, n);
- rb_insert_color(&mcast->rb_node, &ibp->rvp.mcast_tree);
-
- ret = 0;
-
-bail:
- spin_unlock_irq(&ibp->rvp.lock);
-
- return ret;
-}
-
-int hfi1_multicast_attach(struct ib_qp *ibqp, union ib_gid *gid, u16 lid)
-{
- struct rvt_qp *qp = ibqp_to_rvtqp(ibqp);
- struct hfi1_ibdev *dev = to_idev(ibqp->device);
- struct hfi1_ibport *ibp;
- struct hfi1_mcast *mcast;
- struct hfi1_mcast_qp *mqp;
- int ret;
-
- if (ibqp->qp_num <= 1 || qp->state == IB_QPS_RESET) {
- ret = -EINVAL;
- goto bail;
- }
-
- /*
- * Allocate data structures since its better to do this outside of
- * spin locks and it will most likely be needed.
- */
- mcast = mcast_alloc(gid);
- if (mcast == NULL) {
- ret = -ENOMEM;
- goto bail;
- }
- mqp = mcast_qp_alloc(qp);
- if (mqp == NULL) {
- mcast_free(mcast);
- ret = -ENOMEM;
- goto bail;
- }
- ibp = to_iport(ibqp->device, qp->port_num);
- switch (mcast_add(dev, ibp, mcast, mqp)) {
- case ESRCH:
- /* Neither was used: OK to attach the same QP twice. */
- mcast_qp_free(mqp);
- mcast_free(mcast);
- break;
-
- case EEXIST: /* The mcast wasn't used */
- mcast_free(mcast);
- break;
-
- case ENOMEM:
- /* Exceeded the maximum number of mcast groups. */
- mcast_qp_free(mqp);
- mcast_free(mcast);
- ret = -ENOMEM;
- goto bail;
-
- default:
- break;
- }
-
- ret = 0;
-
-bail:
- return ret;
-}
-
-int hfi1_multicast_detach(struct ib_qp *ibqp, union ib_gid *gid, u16 lid)
-{
- struct rvt_qp *qp = ibqp_to_rvtqp(ibqp);
- struct hfi1_ibdev *dev = to_idev(ibqp->device);
- struct hfi1_ibport *ibp = to_iport(ibqp->device, qp->port_num);
- struct hfi1_mcast *mcast = NULL;
- struct hfi1_mcast_qp *p, *tmp;
- struct rb_node *n;
- int last = 0;
- int ret;
-
- if (ibqp->qp_num <= 1 || qp->state == IB_QPS_RESET) {
- ret = -EINVAL;
- goto bail;
- }
-
- spin_lock_irq(&ibp->rvp.lock);
-
- /* Find the GID in the mcast table. */
- n = ibp->rvp.mcast_tree.rb_node;
- while (1) {
- if (n == NULL) {
- spin_unlock_irq(&ibp->rvp.lock);
- ret = -EINVAL;
- goto bail;
- }
-
- mcast = rb_entry(n, struct hfi1_mcast, rb_node);
- ret = memcmp(gid->raw, mcast->mgid.raw,
- sizeof(union ib_gid));
- if (ret < 0)
- n = n->rb_left;
- else if (ret > 0)
- n = n->rb_right;
- else
- break;
- }
-
- /* Search the QP list. */
- list_for_each_entry_safe(p, tmp, &mcast->qp_list, list) {
- if (p->qp != qp)
- continue;
- /*
- * We found it, so remove it, but don't poison the forward
- * link until we are sure there are no list walkers.
- */
- list_del_rcu(&p->list);
- mcast->n_attached--;
-
- /* If this was the last attached QP, remove the GID too. */
- if (list_empty(&mcast->qp_list)) {
- rb_erase(&mcast->rb_node, &ibp->rvp.mcast_tree);
- last = 1;
- }
- break;
- }
-
- spin_unlock_irq(&ibp->rvp.lock);
-
- if (p) {
- /*
- * Wait for any list walkers to finish before freeing the
- * list element.
- */
- wait_event(mcast->wait, atomic_read(&mcast->refcount) <= 1);
- mcast_qp_free(p);
- }
- if (last) {
- atomic_dec(&mcast->refcount);
- wait_event(mcast->wait, !atomic_read(&mcast->refcount));
- mcast_free(mcast);
- spin_lock_irq(&dev->n_mcast_grps_lock);
- dev->n_mcast_grps_allocated--;
- spin_unlock_irq(&dev->n_mcast_grps_lock);
- }
-
- ret = 0;
-
-bail:
- return ret;
-}
-
-int hfi1_mcast_tree_empty(struct hfi1_ibport *ibp)
-{
- return !ibp->rvp.mcast_tree.rb_node;
-}
projects / platform / kernel / linux-starfive.git / commitdiff