364 lines
8.4 KiB
C
364 lines
8.4 KiB
C
/*
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* Copyright (c) 2006, 2007 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/list.h>
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#include <linux/rcupdate.h>
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#include "ipath_verbs.h"
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/*
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* Global table of GID to attached QPs.
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* The table is global to all ipath devices since a send from one QP/device
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* needs to be locally routed to any locally attached QPs on the same
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* or different device.
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*/
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static struct rb_root mcast_tree;
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static DEFINE_SPINLOCK(mcast_lock);
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/**
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* ipath_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 ipath_mcast_qp *ipath_mcast_qp_alloc(struct ipath_qp *qp)
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{
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struct ipath_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 ipath_mcast_qp_free(struct ipath_mcast_qp *mqp)
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{
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struct ipath_qp *qp = mqp->qp;
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/* Notify ipath_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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* ipath_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 ipath_mcast *ipath_mcast_alloc(union ib_gid *mgid)
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{
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struct ipath_mcast *mcast;
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mcast = kmalloc(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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mcast->n_attached = 0;
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bail:
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return mcast;
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}
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static void ipath_mcast_free(struct ipath_mcast *mcast)
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{
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struct ipath_mcast_qp *p, *tmp;
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list_for_each_entry_safe(p, tmp, &mcast->qp_list, list)
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ipath_mcast_qp_free(p);
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kfree(mcast);
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}
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/**
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* ipath_mcast_find - search the global table for the given multicast GID
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* @mgid: the multicast GID to search for
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*
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* Returns NULL if not found.
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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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struct ipath_mcast *ipath_mcast_find(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 ipath_mcast *mcast;
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spin_lock_irqsave(&mcast_lock, flags);
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n = mcast_tree.rb_node;
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while (n) {
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int ret;
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mcast = rb_entry(n, struct ipath_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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spin_unlock_irqrestore(&mcast_lock, flags);
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goto bail;
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}
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}
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spin_unlock_irqrestore(&mcast_lock, flags);
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mcast = NULL;
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bail:
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return mcast;
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}
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/**
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* ipath_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 ipath_mcast_add(struct ipath_ibdev *dev,
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struct ipath_mcast *mcast,
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struct ipath_mcast_qp *mqp)
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{
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struct rb_node **n = &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(&mcast_lock);
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while (*n) {
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struct ipath_mcast *tmcast;
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struct ipath_mcast_qp *p;
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pn = *n;
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tmcast = rb_entry(pn, struct ipath_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 == ib_ipath_max_mcast_qp_attached) {
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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(&dev->n_mcast_grps_lock);
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if (dev->n_mcast_grps_allocated == ib_ipath_max_mcast_grps) {
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spin_unlock(&dev->n_mcast_grps_lock);
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ret = ENOMEM;
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goto bail;
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}
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dev->n_mcast_grps_allocated++;
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spin_unlock(&dev->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, &mcast_tree);
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ret = 0;
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bail:
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spin_unlock_irq(&mcast_lock);
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return ret;
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}
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int ipath_multicast_attach(struct ib_qp *ibqp, union ib_gid *gid, u16 lid)
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{
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struct ipath_qp *qp = to_iqp(ibqp);
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struct ipath_ibdev *dev = to_idev(ibqp->device);
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struct ipath_mcast *mcast;
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struct ipath_mcast_qp *mqp;
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int ret;
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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 = ipath_mcast_alloc(gid);
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if (mcast == NULL) {
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ret = -ENOMEM;
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goto bail;
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}
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mqp = ipath_mcast_qp_alloc(qp);
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if (mqp == NULL) {
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ipath_mcast_free(mcast);
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ret = -ENOMEM;
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goto bail;
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}
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switch (ipath_mcast_add(dev, mcast, mqp)) {
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case ESRCH:
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/* Neither was used: can't attach the same QP twice. */
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ipath_mcast_qp_free(mqp);
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ipath_mcast_free(mcast);
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ret = -EINVAL;
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goto bail;
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case EEXIST: /* The mcast wasn't used */
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ipath_mcast_free(mcast);
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break;
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case ENOMEM:
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/* Exceeded the maximum number of mcast groups. */
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ipath_mcast_qp_free(mqp);
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ipath_mcast_free(mcast);
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ret = -ENOMEM;
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goto bail;
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default:
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break;
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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_multicast_detach(struct ib_qp *ibqp, union ib_gid *gid, u16 lid)
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{
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struct ipath_qp *qp = to_iqp(ibqp);
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struct ipath_ibdev *dev = to_idev(ibqp->device);
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struct ipath_mcast *mcast = NULL;
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struct ipath_mcast_qp *p, *tmp;
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struct rb_node *n;
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int last = 0;
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int ret;
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spin_lock_irq(&mcast_lock);
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/* Find the GID in the mcast table. */
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n = mcast_tree.rb_node;
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while (1) {
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if (n == NULL) {
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spin_unlock_irq(&mcast_lock);
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ret = -EINVAL;
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goto bail;
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}
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mcast = rb_entry(n, struct ipath_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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/* 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, &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(&mcast_lock);
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if (p) {
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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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ipath_mcast_qp_free(p);
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}
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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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ipath_mcast_free(mcast);
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spin_lock_irq(&dev->n_mcast_grps_lock);
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dev->n_mcast_grps_allocated--;
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spin_unlock_irq(&dev->n_mcast_grps_lock);
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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_mcast_tree_empty(void)
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{
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return mcast_tree.rb_node == NULL;
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}
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