drivers/infiniband/core/agent.c - kernel/msm-4.9 - Gitiles

 /*
  * Copyright (c) 2004 Mellanox Technologies Ltd.  All rights reserved.
  * Copyright (c) 2004 Infinicon Corporation.  All rights reserved.
  * Copyright (c) 2004 Intel Corporation.  All rights reserved.
  * Copyright (c) 2004 Topspin Corporation.  All rights reserved.
  * Copyright (c) 2004 Voltaire Corporation.  All rights reserved.
  *
  * This software is available to you under a choice of one of two
  * licenses.  You may choose to be licensed under the terms of the GNU
  * General Public License (GPL) Version 2, available from the file
  * COPYING in the main directory of this source tree, or the
  * OpenIB.org BSD license below:
  *
  *     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.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  * SOFTWARE.
  *
  * $Id: agent.c 1389 2004-12-27 22:56:47Z roland $
  */

 #include <linux/dma-mapping.h>

 #include <asm/bug.h>

 #include <ib_smi.h>

 #include "smi.h"
 #include "agent_priv.h"
 #include "mad_priv.h"
 #include "agent.h"

 spinlock_t ib_agent_port_list_lock;
 static LIST_HEAD(ib_agent_port_list);

 /*
  * Caller must hold ib_agent_port_list_lock
  */
 static inline struct ib_agent_port_private *
 __ib_get_agent_port(struct ib_device *device, int port_num,
 		    struct ib_mad_agent *mad_agent)
 {
 	struct ib_agent_port_private *entry;

 	BUG_ON(!(!!device ^ !!mad_agent));  /* Exactly one MUST be (!NULL) */

 	if (device) {
 		list_for_each_entry(entry, &ib_agent_port_list, port_list) {
 			if (entry->smp_agent->device == device &&
 			    entry->port_num == port_num)
 				return entry;
 		}
 	} else {
 		list_for_each_entry(entry, &ib_agent_port_list, port_list) {
 			if ((entry->smp_agent == mad_agent) ||
 			    (entry->perf_mgmt_agent == mad_agent))
 				return entry;
 		}
 	}
 	return NULL;
 }

 static inline struct ib_agent_port_private *
 ib_get_agent_port(struct ib_device *device, int port_num,
 		  struct ib_mad_agent *mad_agent)
 {
 	struct ib_agent_port_private *entry;
 	unsigned long flags;

 	spin_lock_irqsave(&ib_agent_port_list_lock, flags);
 	entry = __ib_get_agent_port(device, port_num, mad_agent);
 	spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);

 	return entry;
 }

 int smi_check_local_dr_smp(struct ib_smp *smp,
 			   struct ib_device *device,
 			   int port_num)
 {
 	struct ib_agent_port_private *port_priv;

 	if (smp->mgmt_class != IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
 		return 1;
 	port_priv = ib_get_agent_port(device, port_num, NULL);
 	if (!port_priv) {
 		printk(KERN_DEBUG SPFX "smi_check_local_dr_smp %s port %d "
 		       "not open\n",
 		       device->name, port_num);
 		return 1;
 	}

 	return smi_check_local_smp(port_priv->smp_agent, smp);
 }

 static int agent_mad_send(struct ib_mad_agent *mad_agent,
 			  struct ib_agent_port_private *port_priv,
 			  struct ib_mad_private *mad_priv,
 			  struct ib_grh *grh,
 			  struct ib_wc *wc)
 {
 	struct ib_agent_send_wr *agent_send_wr;
 	struct ib_sge gather_list;
 	struct ib_send_wr send_wr;
 	struct ib_send_wr *bad_send_wr;
 	struct ib_ah_attr ah_attr;
 	unsigned long flags;
 	int ret = 1;

 	agent_send_wr = kmalloc(sizeof(*agent_send_wr), GFP_KERNEL);
 	if (!agent_send_wr)
 		goto out;
 	agent_send_wr->mad = mad_priv;

 	gather_list.addr = dma_map_single(mad_agent->device->dma_device,
 					  &mad_priv->mad,
 					  sizeof(mad_priv->mad),
 					  DMA_TO_DEVICE);
 	gather_list.length = sizeof(mad_priv->mad);
 	gather_list.lkey = (*port_priv->mr).lkey;

 	send_wr.next = NULL;
 	send_wr.opcode = IB_WR_SEND;
 	send_wr.sg_list = &gather_list;
 	send_wr.num_sge = 1;
 	send_wr.wr.ud.remote_qpn = wc->src_qp; /* DQPN */
 	send_wr.wr.ud.timeout_ms = 0;
 	send_wr.send_flags = IB_SEND_SIGNALED | IB_SEND_SOLICITED;

 	ah_attr.dlid = wc->slid;
 	ah_attr.port_num = mad_agent->port_num;
 	ah_attr.src_path_bits = wc->dlid_path_bits;
 	ah_attr.sl = wc->sl;
 	ah_attr.static_rate = 0;
 	ah_attr.ah_flags = 0; /* No GRH */
 	if (mad_priv->mad.mad.mad_hdr.mgmt_class == IB_MGMT_CLASS_PERF_MGMT) {
 		if (wc->wc_flags & IB_WC_GRH) {
 			ah_attr.ah_flags = IB_AH_GRH;
 			/* Should sgid be looked up ? */
 			ah_attr.grh.sgid_index = 0;
 			ah_attr.grh.hop_limit = grh->hop_limit;
 			ah_attr.grh.flow_label = be32_to_cpup(
 				&grh->version_tclass_flow)  & 0xfffff;
 			ah_attr.grh.traffic_class = (be32_to_cpup(
 				&grh->version_tclass_flow) >> 20) & 0xff;
 			memcpy(ah_attr.grh.dgid.raw,
 			       grh->sgid.raw,
 			       sizeof(ah_attr.grh.dgid));
 		}
 	}

 	agent_send_wr->ah = ib_create_ah(mad_agent->qp->pd, &ah_attr);
 	if (IS_ERR(agent_send_wr->ah)) {
 		printk(KERN_ERR SPFX "No memory for address handle\n");
 		kfree(agent_send_wr);
 		goto out;
 	}

 	send_wr.wr.ud.ah = agent_send_wr->ah;
 	if (mad_priv->mad.mad.mad_hdr.mgmt_class == IB_MGMT_CLASS_PERF_MGMT) {
 		send_wr.wr.ud.pkey_index = wc->pkey_index;
 		send_wr.wr.ud.remote_qkey = IB_QP1_QKEY;
 	} else { 	/* for SMPs */
 		send_wr.wr.ud.pkey_index = 0;
 		send_wr.wr.ud.remote_qkey = 0;
 	}
 	send_wr.wr.ud.mad_hdr = &mad_priv->mad.mad.mad_hdr;
 	send_wr.wr_id = (unsigned long)agent_send_wr;

 	pci_unmap_addr_set(agent_send_wr, mapping, gather_list.addr);

 	/* Send */
 	spin_lock_irqsave(&port_priv->send_list_lock, flags);
 	if (ib_post_send_mad(mad_agent, &send_wr, &bad_send_wr)) {
 		spin_unlock_irqrestore(&port_priv->send_list_lock, flags);
 		dma_unmap_single(mad_agent->device->dma_device,
 				 pci_unmap_addr(agent_send_wr, mapping),
 				 sizeof(mad_priv->mad),
 				 DMA_TO_DEVICE);
 		ib_destroy_ah(agent_send_wr->ah);
 		kfree(agent_send_wr);
 	} else {
 		list_add_tail(&agent_send_wr->send_list,
 			      &port_priv->send_posted_list);
 		spin_unlock_irqrestore(&port_priv->send_list_lock, flags);
 		ret = 0;
 	}

 out:
 	return ret;
 }

 int agent_send(struct ib_mad_private *mad,
 	       struct ib_grh *grh,
 	       struct ib_wc *wc,
 	       struct ib_device *device,
 	       int port_num)
 {
 	struct ib_agent_port_private *port_priv;
 	struct ib_mad_agent *mad_agent;

 	port_priv = ib_get_agent_port(device, port_num, NULL);
 	if (!port_priv) {
 		printk(KERN_DEBUG SPFX "agent_send %s port %d not open\n",
 		       device->name, port_num);
 		return 1;
 	}

 	/* Get mad agent based on mgmt_class in MAD */
 	switch (mad->mad.mad.mad_hdr.mgmt_class) {
 		case IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE:
 		case IB_MGMT_CLASS_SUBN_LID_ROUTED:
 			mad_agent = port_priv->smp_agent;
 			break;
 		case IB_MGMT_CLASS_PERF_MGMT:
 			mad_agent = port_priv->perf_mgmt_agent;
 			break;
 		default:
 			return 1;
 	}

 	return agent_mad_send(mad_agent, port_priv, mad, grh, wc);
 }

 static void agent_send_handler(struct ib_mad_agent *mad_agent,
 			       struct ib_mad_send_wc *mad_send_wc)
 {
 	struct ib_agent_port_private	*port_priv;
 	struct ib_agent_send_wr		*agent_send_wr;
 	unsigned long			flags;

 	/* Find matching MAD agent */
 	port_priv = ib_get_agent_port(NULL, 0, mad_agent);
 	if (!port_priv) {
 		printk(KERN_ERR SPFX "agent_send_handler: no matching MAD "
 		       "agent %p\n", mad_agent);
 		return;
 	}

 	agent_send_wr = (struct ib_agent_send_wr *)(unsigned long)mad_send_wc->wr_id;
 	spin_lock_irqsave(&port_priv->send_list_lock, flags);
 	/* Remove completed send from posted send MAD list */
 	list_del(&agent_send_wr->send_list);
 	spin_unlock_irqrestore(&port_priv->send_list_lock, flags);

 	dma_unmap_single(mad_agent->device->dma_device,
 			 pci_unmap_addr(agent_send_wr, mapping),
 			 sizeof(agent_send_wr->mad->mad),
 			 DMA_TO_DEVICE);

 	ib_destroy_ah(agent_send_wr->ah);

 	/* Release allocated memory */
 	kmem_cache_free(ib_mad_cache, agent_send_wr->mad);
 	kfree(agent_send_wr);
 }

 int ib_agent_port_open(struct ib_device *device, int port_num)
 {
 	int ret;
 	struct ib_agent_port_private *port_priv;
 	unsigned long flags;

 	/* First, check if port already open for SMI */
 	port_priv = ib_get_agent_port(device, port_num, NULL);
 	if (port_priv) {
 		printk(KERN_DEBUG SPFX "%s port %d already open\n",
 		       device->name, port_num);
 		return 0;
 	}

 	/* Create new device info */
 	port_priv = kmalloc(sizeof *port_priv, GFP_KERNEL);
 	if (!port_priv) {
 		printk(KERN_ERR SPFX "No memory for ib_agent_port_private\n");
 		ret = -ENOMEM;
 		goto error1;
 	}

 	memset(port_priv, 0, sizeof *port_priv);
 	port_priv->port_num = port_num;
 	spin_lock_init(&port_priv->send_list_lock);
 	INIT_LIST_HEAD(&port_priv->send_posted_list);

 	/* Obtain send only MAD agent for SM class (SMI QP) */
 	port_priv->smp_agent = ib_register_mad_agent(device, port_num,
 						     IB_QPT_SMI,
 						     NULL, 0,
 						    &agent_send_handler,
 						     NULL, NULL);

 	if (IS_ERR(port_priv->smp_agent)) {
 		ret = PTR_ERR(port_priv->smp_agent);
 		goto error2;
 	}

 	/* Obtain send only MAD agent for PerfMgmt class (GSI QP) */
 	port_priv->perf_mgmt_agent = ib_register_mad_agent(device, port_num,
 							   IB_QPT_GSI,
 							   NULL, 0,
 							  &agent_send_handler,
 							   NULL, NULL);
 	if (IS_ERR(port_priv->perf_mgmt_agent)) {
 		ret = PTR_ERR(port_priv->perf_mgmt_agent);
 		goto error3;
 	}

 	port_priv->mr = ib_get_dma_mr(port_priv->smp_agent->qp->pd,
 				      IB_ACCESS_LOCAL_WRITE);
 	if (IS_ERR(port_priv->mr)) {
 		printk(KERN_ERR SPFX "Couldn't get DMA MR\n");
 		ret = PTR_ERR(port_priv->mr);
 		goto error4;
 	}

 	spin_lock_irqsave(&ib_agent_port_list_lock, flags);
 	list_add_tail(&port_priv->port_list, &ib_agent_port_list);
 	spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);

 	return 0;

 error4:
 	ib_unregister_mad_agent(port_priv->perf_mgmt_agent);
 error3:
 	ib_unregister_mad_agent(port_priv->smp_agent);
 error2:
 	kfree(port_priv);
 error1:
 	return ret;
 }

 int ib_agent_port_close(struct ib_device *device, int port_num)
 {
 	struct ib_agent_port_private *port_priv;
 	unsigned long flags;

 	spin_lock_irqsave(&ib_agent_port_list_lock, flags);
 	port_priv = __ib_get_agent_port(device, port_num, NULL);
 	if (port_priv == NULL) {
 		spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);
 		printk(KERN_ERR SPFX "Port %d not found\n", port_num);
 		return -ENODEV;
 	}
 	list_del(&port_priv->port_list);
 	spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);

 	ib_dereg_mr(port_priv->mr);

 	ib_unregister_mad_agent(port_priv->perf_mgmt_agent);
 	ib_unregister_mad_agent(port_priv->smp_agent);
 	kfree(port_priv);

 	return 0;
 }
	/*
	* Copyright (c) 2004 Mellanox Technologies Ltd. All rights reserved.
	* Copyright (c) 2004 Infinicon Corporation. All rights reserved.
	* Copyright (c) 2004 Intel Corporation. All rights reserved.
	* Copyright (c) 2004 Topspin Corporation. All rights reserved.
	* Copyright (c) 2004 Voltaire Corporation. All rights reserved.
	*
	* This software is available to you under a choice of one of two
	* licenses. You may choose to be licensed under the terms of the GNU
	* General Public License (GPL) Version 2, available from the file
	* COPYING in the main directory of this source tree, or the
	* OpenIB.org BSD license below:
	*
	* 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.
	*
	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
	* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
	* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
	* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
	* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
	* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
	* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
	* SOFTWARE.
	*
	* $Id: agent.c 1389 2004-12-27 22:56:47Z roland $
	*/

	#include <linux/dma-mapping.h>

	#include <asm/bug.h>

	#include <ib_smi.h>

	#include "smi.h"
	#include "agent_priv.h"
	#include "mad_priv.h"
	#include "agent.h"

	spinlock_t ib_agent_port_list_lock;
	static LIST_HEAD(ib_agent_port_list);

	/*
	* Caller must hold ib_agent_port_list_lock
	*/
	static inline struct ib_agent_port_private *
	__ib_get_agent_port(struct ib_device *device, int port_num,
	struct ib_mad_agent *mad_agent)
	{
	struct ib_agent_port_private *entry;

	BUG_ON(!(!!device ^ !!mad_agent)); /* Exactly one MUST be (!NULL) */

	if (device) {
	list_for_each_entry(entry, &ib_agent_port_list, port_list) {
	if (entry->smp_agent->device == device &&
	entry->port_num == port_num)
	return entry;
	}
	} else {
	list_for_each_entry(entry, &ib_agent_port_list, port_list) {
	if ((entry->smp_agent == mad_agent) \|\|
	(entry->perf_mgmt_agent == mad_agent))
	return entry;
	}
	}
	return NULL;
	}

	static inline struct ib_agent_port_private *
	ib_get_agent_port(struct ib_device *device, int port_num,
	struct ib_mad_agent *mad_agent)
	{
	struct ib_agent_port_private *entry;
	unsigned long flags;

	spin_lock_irqsave(&ib_agent_port_list_lock, flags);
	entry = __ib_get_agent_port(device, port_num, mad_agent);
	spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);

	return entry;
	}

	int smi_check_local_dr_smp(struct ib_smp *smp,
	struct ib_device *device,
	int port_num)
	{
	struct ib_agent_port_private *port_priv;

	if (smp->mgmt_class != IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
	return 1;
	port_priv = ib_get_agent_port(device, port_num, NULL);
	if (!port_priv) {
	printk(KERN_DEBUG SPFX "smi_check_local_dr_smp %s port %d "
	"not open\n",
	device->name, port_num);
	return 1;
	}

	return smi_check_local_smp(port_priv->smp_agent, smp);
	}

	static int agent_mad_send(struct ib_mad_agent *mad_agent,
	struct ib_agent_port_private *port_priv,
	struct ib_mad_private *mad_priv,
	struct ib_grh *grh,
	struct ib_wc *wc)
	{
	struct ib_agent_send_wr *agent_send_wr;
	struct ib_sge gather_list;
	struct ib_send_wr send_wr;
	struct ib_send_wr *bad_send_wr;
	struct ib_ah_attr ah_attr;
	unsigned long flags;
	int ret = 1;

	agent_send_wr = kmalloc(sizeof(*agent_send_wr), GFP_KERNEL);
	if (!agent_send_wr)
	goto out;
	agent_send_wr->mad = mad_priv;

	gather_list.addr = dma_map_single(mad_agent->device->dma_device,
	&mad_priv->mad,
	sizeof(mad_priv->mad),
	DMA_TO_DEVICE);
	gather_list.length = sizeof(mad_priv->mad);
	gather_list.lkey = (*port_priv->mr).lkey;

	send_wr.next = NULL;
	send_wr.opcode = IB_WR_SEND;
	send_wr.sg_list = &gather_list;
	send_wr.num_sge = 1;
	send_wr.wr.ud.remote_qpn = wc->src_qp; /* DQPN */
	send_wr.wr.ud.timeout_ms = 0;
	send_wr.send_flags = IB_SEND_SIGNALED \| IB_SEND_SOLICITED;

	ah_attr.dlid = wc->slid;
	ah_attr.port_num = mad_agent->port_num;
	ah_attr.src_path_bits = wc->dlid_path_bits;
	ah_attr.sl = wc->sl;
	ah_attr.static_rate = 0;
	ah_attr.ah_flags = 0; /* No GRH */
	if (mad_priv->mad.mad.mad_hdr.mgmt_class == IB_MGMT_CLASS_PERF_MGMT) {
	if (wc->wc_flags & IB_WC_GRH) {
	ah_attr.ah_flags = IB_AH_GRH;
	/* Should sgid be looked up ? */
	ah_attr.grh.sgid_index = 0;
	ah_attr.grh.hop_limit = grh->hop_limit;
	ah_attr.grh.flow_label = be32_to_cpup(
	&grh->version_tclass_flow) & 0xfffff;
	ah_attr.grh.traffic_class = (be32_to_cpup(
	&grh->version_tclass_flow) >> 20) & 0xff;
	memcpy(ah_attr.grh.dgid.raw,
	grh->sgid.raw,
	sizeof(ah_attr.grh.dgid));
	}
	}

	agent_send_wr->ah = ib_create_ah(mad_agent->qp->pd, &ah_attr);
	if (IS_ERR(agent_send_wr->ah)) {
	printk(KERN_ERR SPFX "No memory for address handle\n");
	kfree(agent_send_wr);
	goto out;
	}

	send_wr.wr.ud.ah = agent_send_wr->ah;
	if (mad_priv->mad.mad.mad_hdr.mgmt_class == IB_MGMT_CLASS_PERF_MGMT) {
	send_wr.wr.ud.pkey_index = wc->pkey_index;
	send_wr.wr.ud.remote_qkey = IB_QP1_QKEY;
	} else { /* for SMPs */
	send_wr.wr.ud.pkey_index = 0;
	send_wr.wr.ud.remote_qkey = 0;
	}
	send_wr.wr.ud.mad_hdr = &mad_priv->mad.mad.mad_hdr;
	send_wr.wr_id = (unsigned long)agent_send_wr;

	pci_unmap_addr_set(agent_send_wr, mapping, gather_list.addr);

	/* Send */
	spin_lock_irqsave(&port_priv->send_list_lock, flags);
	if (ib_post_send_mad(mad_agent, &send_wr, &bad_send_wr)) {
	spin_unlock_irqrestore(&port_priv->send_list_lock, flags);
	dma_unmap_single(mad_agent->device->dma_device,
	pci_unmap_addr(agent_send_wr, mapping),
	sizeof(mad_priv->mad),
	DMA_TO_DEVICE);
	ib_destroy_ah(agent_send_wr->ah);
	kfree(agent_send_wr);
	} else {
	list_add_tail(&agent_send_wr->send_list,
	&port_priv->send_posted_list);
	spin_unlock_irqrestore(&port_priv->send_list_lock, flags);
	ret = 0;
	}

	out:
	return ret;
	}

	int agent_send(struct ib_mad_private *mad,
	struct ib_grh *grh,
	struct ib_wc *wc,
	struct ib_device *device,
	int port_num)
	{
	struct ib_agent_port_private *port_priv;
	struct ib_mad_agent *mad_agent;

	port_priv = ib_get_agent_port(device, port_num, NULL);
	if (!port_priv) {
	printk(KERN_DEBUG SPFX "agent_send %s port %d not open\n",
	device->name, port_num);
	return 1;
	}

	/* Get mad agent based on mgmt_class in MAD */
	switch (mad->mad.mad.mad_hdr.mgmt_class) {
	case IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE:
	case IB_MGMT_CLASS_SUBN_LID_ROUTED:
	mad_agent = port_priv->smp_agent;
	break;
	case IB_MGMT_CLASS_PERF_MGMT:
	mad_agent = port_priv->perf_mgmt_agent;
	break;
	default:
	return 1;
	}

	return agent_mad_send(mad_agent, port_priv, mad, grh, wc);
	}

	static void agent_send_handler(struct ib_mad_agent *mad_agent,
	struct ib_mad_send_wc *mad_send_wc)
	{
	struct ib_agent_port_private *port_priv;
	struct ib_agent_send_wr *agent_send_wr;
	unsigned long flags;

	/* Find matching MAD agent */
	port_priv = ib_get_agent_port(NULL, 0, mad_agent);
	if (!port_priv) {
	printk(KERN_ERR SPFX "agent_send_handler: no matching MAD "
	"agent %p\n", mad_agent);
	return;
	}

	agent_send_wr = (struct ib_agent_send_wr *)(unsigned long)mad_send_wc->wr_id;
	spin_lock_irqsave(&port_priv->send_list_lock, flags);
	/* Remove completed send from posted send MAD list */
	list_del(&agent_send_wr->send_list);
	spin_unlock_irqrestore(&port_priv->send_list_lock, flags);

	dma_unmap_single(mad_agent->device->dma_device,
	pci_unmap_addr(agent_send_wr, mapping),
	sizeof(agent_send_wr->mad->mad),
	DMA_TO_DEVICE);

	ib_destroy_ah(agent_send_wr->ah);

	/* Release allocated memory */
	kmem_cache_free(ib_mad_cache, agent_send_wr->mad);
	kfree(agent_send_wr);
	}

	int ib_agent_port_open(struct ib_device *device, int port_num)
	{
	int ret;
	struct ib_agent_port_private *port_priv;
	unsigned long flags;

	/* First, check if port already open for SMI */
	port_priv = ib_get_agent_port(device, port_num, NULL);
	if (port_priv) {
	printk(KERN_DEBUG SPFX "%s port %d already open\n",
	device->name, port_num);
	return 0;
	}

	/* Create new device info */
	port_priv = kmalloc(sizeof *port_priv, GFP_KERNEL);
	if (!port_priv) {
	printk(KERN_ERR SPFX "No memory for ib_agent_port_private\n");
	ret = -ENOMEM;
	goto error1;
	}

	memset(port_priv, 0, sizeof *port_priv);
	port_priv->port_num = port_num;
	spin_lock_init(&port_priv->send_list_lock);
	INIT_LIST_HEAD(&port_priv->send_posted_list);

	/* Obtain send only MAD agent for SM class (SMI QP) */
	port_priv->smp_agent = ib_register_mad_agent(device, port_num,
	IB_QPT_SMI,
	NULL, 0,
	&agent_send_handler,
	NULL, NULL);

	if (IS_ERR(port_priv->smp_agent)) {
	ret = PTR_ERR(port_priv->smp_agent);
	goto error2;
	}

	/* Obtain send only MAD agent for PerfMgmt class (GSI QP) */
	port_priv->perf_mgmt_agent = ib_register_mad_agent(device, port_num,
	IB_QPT_GSI,
	NULL, 0,
	&agent_send_handler,
	NULL, NULL);
	if (IS_ERR(port_priv->perf_mgmt_agent)) {
	ret = PTR_ERR(port_priv->perf_mgmt_agent);
	goto error3;
	}

	port_priv->mr = ib_get_dma_mr(port_priv->smp_agent->qp->pd,
	IB_ACCESS_LOCAL_WRITE);
	if (IS_ERR(port_priv->mr)) {
	printk(KERN_ERR SPFX "Couldn't get DMA MR\n");
	ret = PTR_ERR(port_priv->mr);
	goto error4;
	}

	spin_lock_irqsave(&ib_agent_port_list_lock, flags);
	list_add_tail(&port_priv->port_list, &ib_agent_port_list);
	spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);

	return 0;

	error4:
	ib_unregister_mad_agent(port_priv->perf_mgmt_agent);
	error3:
	ib_unregister_mad_agent(port_priv->smp_agent);
	error2:
	kfree(port_priv);
	error1:
	return ret;
	}

	int ib_agent_port_close(struct ib_device *device, int port_num)
	{
	struct ib_agent_port_private *port_priv;
	unsigned long flags;

	spin_lock_irqsave(&ib_agent_port_list_lock, flags);
	port_priv = __ib_get_agent_port(device, port_num, NULL);
	if (port_priv == NULL) {
	spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);
	printk(KERN_ERR SPFX "Port %d not found\n", port_num);
	return -ENODEV;
	}
	list_del(&port_priv->port_list);
	spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);

	ib_dereg_mr(port_priv->mr);

	ib_unregister_mad_agent(port_priv->perf_mgmt_agent);
	ib_unregister_mad_agent(port_priv->smp_agent);
	kfree(port_priv);

	return 0;
	}