[deliverable/linux.git] / drivers / infiniband / core / agent.c

/*
 * Copyright (c) 2004, 2005 Mellanox Technologies Ltd.  All rights reserved.
 * Copyright (c) 2004, 2005 Infinicon Corporation.  All rights reserved.
 * Copyright (c) 2004, 2005 Intel Corporation.  All rights reserved.
 * Copyright (c) 2004, 2005 Topspin Corporation.  All rights reserved.
 * Copyright (c) 2004, 2005 Voltaire Corporation.  All rights reserved.
 * Copyright (c) 2005 Sun Microsystems, Inc. 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 <rdma/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 = mad_agent->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_cpu(
				grh->version_tclass_flow)  & 0xfffff;
			ah_attr.grh.traffic_class = (be32_to_cpu(
				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;
	}

	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;

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

	return 0;
}
Commit	Line	Data
1da177e4	1	/*
2a1d9b7f RD	2	* Copyright (c) 2004, 2005 Mellanox Technologies Ltd. All rights reserved.
	3	* Copyright (c) 2004, 2005 Infinicon Corporation. All rights reserved.
	4	* Copyright (c) 2004, 2005 Intel Corporation. All rights reserved.
	5	* Copyright (c) 2004, 2005 Topspin Corporation. All rights reserved.
	6	* Copyright (c) 2004, 2005 Voltaire Corporation. All rights reserved.
	7	* Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
1da177e4 LT	8	*
	9	* This software is available to you under a choice of one of two
	10	* licenses. You may choose to be licensed under the terms of the GNU
	11	* General Public License (GPL) Version 2, available from the file
	12	* COPYING in the main directory of this source tree, or the
	13	* OpenIB.org BSD license below:
	14	*
	15	* Redistribution and use in source and binary forms, with or
	16	* without modification, are permitted provided that the following
	17	* conditions are met:
	18	*
	19	* - Redistributions of source code must retain the above
	20	* copyright notice, this list of conditions and the following
	21	* disclaimer.
	22	*
	23	* - Redistributions in binary form must reproduce the above
	24	* copyright notice, this list of conditions and the following
	25	* disclaimer in the documentation and/or other materials
	26	* provided with the distribution.
	27	*
	28	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
	29	* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
	30	* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
	31	* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
	32	* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
	33	* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
	34	* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
	35	* SOFTWARE.
	36	*
	37	* $Id: agent.c 1389 2004-12-27 22:56:47Z roland $
	38	*/
	39
	40	#include <linux/dma-mapping.h>
	41
	42	#include <asm/bug.h>
	43
a4d61e84	44	#include <rdma/ib_smi.h>
1da177e4 LT	45
	46	#include "smi.h"
	47	#include "agent_priv.h"
	48	#include "mad_priv.h"
	49	#include "agent.h"
	50
	51	spinlock_t ib_agent_port_list_lock;
	52	static LIST_HEAD(ib_agent_port_list);
	53
	54	/*
	55	* Caller must hold ib_agent_port_list_lock
	56	*/
	57	static inline struct ib_agent_port_private *
	58	__ib_get_agent_port(struct ib_device *device, int port_num,
	59	struct ib_mad_agent *mad_agent)
	60	{
	61	struct ib_agent_port_private *entry;
	62
	63	BUG_ON(!(!!device ^ !!mad_agent)); /* Exactly one MUST be (!NULL) */
	64
	65	if (device) {
	66	list_for_each_entry(entry, &ib_agent_port_list, port_list) {
	67	if (entry->smp_agent->device == device &&
	68	entry->port_num == port_num)
	69	return entry;
	70	}
	71	} else {
	72	list_for_each_entry(entry, &ib_agent_port_list, port_list) {
	73	if ((entry->smp_agent == mad_agent) \|\|
	74	(entry->perf_mgmt_agent == mad_agent))
	75	return entry;
	76	}
	77	}
	78	return NULL;
	79	}
	80
	81	static inline struct ib_agent_port_private *
	82	ib_get_agent_port(struct ib_device *device, int port_num,
	83	struct ib_mad_agent *mad_agent)
	84	{
	85	struct ib_agent_port_private *entry;
	86	unsigned long flags;
	87
	88	spin_lock_irqsave(&ib_agent_port_list_lock, flags);
	89	entry = __ib_get_agent_port(device, port_num, mad_agent);
	90	spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);
	91
	92	return entry;
	93	}
	94
	95	int smi_check_local_dr_smp(struct ib_smp *smp,
	96	struct ib_device *device,
	97	int port_num)
	98	{
	99	struct ib_agent_port_private *port_priv;
	100
	101	if (smp->mgmt_class != IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
	102	return 1;
	103	port_priv = ib_get_agent_port(device, port_num, NULL);
	104	if (!port_priv) {
	105	printk(KERN_DEBUG SPFX "smi_check_local_dr_smp %s port %d "
	106	"not open\n",
	107	device->name, port_num);
	108	return 1;
109	}
110
111	return smi_check_local_smp(port_priv->smp_agent, smp);
112	}
113
114	static int agent_mad_send(struct ib_mad_agent *mad_agent,
115	struct ib_agent_port_private *port_priv,
116	struct ib_mad_private *mad_priv,
117	struct ib_grh *grh,
118	struct ib_wc *wc)
119	{
120	struct ib_agent_send_wr *agent_send_wr;
121	struct ib_sge gather_list;
122	struct ib_send_wr send_wr;
123	struct ib_send_wr *bad_send_wr;
124	struct ib_ah_attr ah_attr;
125	unsigned long flags;
126	int ret = 1;
127
128	agent_send_wr = kmalloc(sizeof(*agent_send_wr), GFP_KERNEL);
129	if (!agent_send_wr)
130	goto out;
131	agent_send_wr->mad = mad_priv;
132
1da177e4 LT	133	gather_list.addr = dma_map_single(mad_agent->device->dma_device,
	134	&mad_priv->mad,
	135	sizeof(mad_priv->mad),
	136	DMA_TO_DEVICE);
	137	gather_list.length = sizeof(mad_priv->mad);
b82cab6b	138	gather_list.lkey = mad_agent->mr->lkey;
1da177e4 LT	139
	140	send_wr.next = NULL;
	141	send_wr.opcode = IB_WR_SEND;
	142	send_wr.sg_list = &gather_list;
	143	send_wr.num_sge = 1;
	144	send_wr.wr.ud.remote_qpn = wc->src_qp; /* DQPN */
	145	send_wr.wr.ud.timeout_ms = 0;
	146	send_wr.send_flags = IB_SEND_SIGNALED \| IB_SEND_SOLICITED;
	147
	148	ah_attr.dlid = wc->slid;
	149	ah_attr.port_num = mad_agent->port_num;
	150	ah_attr.src_path_bits = wc->dlid_path_bits;
	151	ah_attr.sl = wc->sl;
	152	ah_attr.static_rate = 0;
	153	ah_attr.ah_flags = 0; /* No GRH */
	154	if (mad_priv->mad.mad.mad_hdr.mgmt_class == IB_MGMT_CLASS_PERF_MGMT) {
	155	if (wc->wc_flags & IB_WC_GRH) {
	156	ah_attr.ah_flags = IB_AH_GRH;
	157	/* Should sgid be looked up ? */
	158	ah_attr.grh.sgid_index = 0;
	159	ah_attr.grh.hop_limit = grh->hop_limit;
497677ab HR	160	ah_attr.grh.flow_label = be32_to_cpu(
	161	grh->version_tclass_flow) & 0xfffff;
	162	ah_attr.grh.traffic_class = (be32_to_cpu(
	163	grh->version_tclass_flow) >> 20) & 0xff;
1da177e4 LT	164	memcpy(ah_attr.grh.dgid.raw,
	165	grh->sgid.raw,
	166	sizeof(ah_attr.grh.dgid));
	167	}
	168	}
	169
	170	agent_send_wr->ah = ib_create_ah(mad_agent->qp->pd, &ah_attr);
	171	if (IS_ERR(agent_send_wr->ah)) {
	172	printk(KERN_ERR SPFX "No memory for address handle\n");
	173	kfree(agent_send_wr);
	174	goto out;
	175	}
	176
	177	send_wr.wr.ud.ah = agent_send_wr->ah;
	178	if (mad_priv->mad.mad.mad_hdr.mgmt_class == IB_MGMT_CLASS_PERF_MGMT) {
	179	send_wr.wr.ud.pkey_index = wc->pkey_index;
	180	send_wr.wr.ud.remote_qkey = IB_QP1_QKEY;
	181	} else { /* for SMPs */
	182	send_wr.wr.ud.pkey_index = 0;
	183	send_wr.wr.ud.remote_qkey = 0;
	184	}
	185	send_wr.wr.ud.mad_hdr = &mad_priv->mad.mad.mad_hdr;
	186	send_wr.wr_id = (unsigned long)agent_send_wr;
	187
	188	pci_unmap_addr_set(agent_send_wr, mapping, gather_list.addr);
	189
	190	/* Send */
	191	spin_lock_irqsave(&port_priv->send_list_lock, flags);
	192	if (ib_post_send_mad(mad_agent, &send_wr, &bad_send_wr)) {
	193	spin_unlock_irqrestore(&port_priv->send_list_lock, flags);
	194	dma_unmap_single(mad_agent->device->dma_device,
	195	pci_unmap_addr(agent_send_wr, mapping),
	196	sizeof(mad_priv->mad),
	197	DMA_TO_DEVICE);
	198	ib_destroy_ah(agent_send_wr->ah);
	199	kfree(agent_send_wr);
	200	} else {
	201	list_add_tail(&agent_send_wr->send_list,
	202	&port_priv->send_posted_list);
	203	spin_unlock_irqrestore(&port_priv->send_list_lock, flags);
	204	ret = 0;
	205	}
	206
	207	out:
	208	return ret;
	209	}
	210
	211	int agent_send(struct ib_mad_private *mad,
	212	struct ib_grh *grh,
	213	struct ib_wc *wc,
	214	struct ib_device *device,
	215	int port_num)
	216	{
	217	struct ib_agent_port_private *port_priv;
	218	struct ib_mad_agent *mad_agent;
	219
	220	port_priv = ib_get_agent_port(device, port_num, NULL);
	221	if (!port_priv) {
	222	printk(KERN_DEBUG SPFX "agent_send %s port %d not open\n",
	223	device->name, port_num);
	224	return 1;
	225	}
	226
	227	/* Get mad agent based on mgmt_class in MAD */
228	switch (mad->mad.mad.mad_hdr.mgmt_class) {
229	case IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE:
230	case IB_MGMT_CLASS_SUBN_LID_ROUTED:
231	mad_agent = port_priv->smp_agent;
232	break;
233	case IB_MGMT_CLASS_PERF_MGMT:
234	mad_agent = port_priv->perf_mgmt_agent;
235	break;
236	default:
237	return 1;
238	}
239
240	return agent_mad_send(mad_agent, port_priv, mad, grh, wc);
241	}
242
243	static void agent_send_handler(struct ib_mad_agent *mad_agent,
244	struct ib_mad_send_wc *mad_send_wc)
245	{
246	struct ib_agent_port_private *port_priv;
247	struct ib_agent_send_wr *agent_send_wr;
248	unsigned long flags;
249
250	/* Find matching MAD agent */
251	port_priv = ib_get_agent_port(NULL, 0, mad_agent);
252	if (!port_priv) {
253	printk(KERN_ERR SPFX "agent_send_handler: no matching MAD "
254	"agent %p\n", mad_agent);
255	return;
256	}
257
258	agent_send_wr = (struct ib_agent_send_wr *)(unsigned long)mad_send_wc->wr_id;
259	spin_lock_irqsave(&port_priv->send_list_lock, flags);
260	/* Remove completed send from posted send MAD list */
261	list_del(&agent_send_wr->send_list);
262	spin_unlock_irqrestore(&port_priv->send_list_lock, flags);
263
1da177e4 LT	264	dma_unmap_single(mad_agent->device->dma_device,
	265	pci_unmap_addr(agent_send_wr, mapping),
	266	sizeof(agent_send_wr->mad->mad),
	267	DMA_TO_DEVICE);
	268
	269	ib_destroy_ah(agent_send_wr->ah);
	270
	271	/* Release allocated memory */
	272	kmem_cache_free(ib_mad_cache, agent_send_wr->mad);
	273	kfree(agent_send_wr);
	274	}
	275
	276	int ib_agent_port_open(struct ib_device *device, int port_num)
	277	{
	278	int ret;
	279	struct ib_agent_port_private *port_priv;
	280	unsigned long flags;
	281
	282	/* First, check if port already open for SMI */
	283	port_priv = ib_get_agent_port(device, port_num, NULL);
	284	if (port_priv) {
	285	printk(KERN_DEBUG SPFX "%s port %d already open\n",
	286	device->name, port_num);
	287	return 0;
	288	}
	289
	290	/* Create new device info */
	291	port_priv = kmalloc(sizeof *port_priv, GFP_KERNEL);
	292	if (!port_priv) {
	293	printk(KERN_ERR SPFX "No memory for ib_agent_port_private\n");
	294	ret = -ENOMEM;
	295	goto error1;
	296	}
	297
	298	memset(port_priv, 0, sizeof *port_priv);
	299	port_priv->port_num = port_num;
	300	spin_lock_init(&port_priv->send_list_lock);
	301	INIT_LIST_HEAD(&port_priv->send_posted_list);
	302
	303	/* Obtain send only MAD agent for SM class (SMI QP) */
	304	port_priv->smp_agent = ib_register_mad_agent(device, port_num,
	305	IB_QPT_SMI,
	306	NULL, 0,
	307	&agent_send_handler,
	308	NULL, NULL);
	309
	310	if (IS_ERR(port_priv->smp_agent)) {
	311	ret = PTR_ERR(port_priv->smp_agent);
	312	goto error2;
	313	}
	314
	315	/* Obtain send only MAD agent for PerfMgmt class (GSI QP) */
	316	port_priv->perf_mgmt_agent = ib_register_mad_agent(device, port_num,
	317	IB_QPT_GSI,
	318	NULL, 0,
	319	&agent_send_handler,
	320	NULL, NULL);
	321	if (IS_ERR(port_priv->perf_mgmt_agent)) {
	322	ret = PTR_ERR(port_priv->perf_mgmt_agent);
	323	goto error3;
	324	}
	325
1da177e4 LT	326	spin_lock_irqsave(&ib_agent_port_list_lock, flags);
	327	list_add_tail(&port_priv->port_list, &ib_agent_port_list);
	328	spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);
	329
	330	return 0;
	331
1da177e4 LT	332	error3:
	333	ib_unregister_mad_agent(port_priv->smp_agent);
	334	error2:
	335	kfree(port_priv);
	336	error1:
	337	return ret;
	338	}
	339
	340	int ib_agent_port_close(struct ib_device *device, int port_num)
	341	{
	342	struct ib_agent_port_private *port_priv;
	343	unsigned long flags;
	344
	345	spin_lock_irqsave(&ib_agent_port_list_lock, flags);
	346	port_priv = __ib_get_agent_port(device, port_num, NULL);
	347	if (port_priv == NULL) {
	348	spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);
	349	printk(KERN_ERR SPFX "Port %d not found\n", port_num);
	350	return -ENODEV;
	351	}
	352	list_del(&port_priv->port_list);
	353	spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);
	354
1da177e4 LT	355	ib_unregister_mad_agent(port_priv->perf_mgmt_agent);
	356	ib_unregister_mad_agent(port_priv->smp_agent);
	357	kfree(port_priv);
	358
	359	return 0;
	360	}