[linux-block.git] / drivers / infiniband / hw / mthca / mthca_mad.c

/*
 * Copyright (c) 2004 Topspin Communications.  All rights reserved.
 * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
 * Copyright (c) 2004 Voltaire, 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: mthca_mad.c 1349 2004-12-16 21:09:43Z roland $
 */

#include <linux/string.h>
#include <linux/slab.h>

#include <rdma/ib_verbs.h>
#include <rdma/ib_mad.h>
#include <rdma/ib_smi.h>

#include "mthca_dev.h"
#include "mthca_cmd.h"

enum {
	MTHCA_VENDOR_CLASS1 = 0x9,
	MTHCA_VENDOR_CLASS2 = 0xa
};

int mthca_update_rate(struct mthca_dev *dev, u8 port_num)
{
	struct ib_port_attr *tprops = NULL;
	int                  ret;

	tprops = kmalloc(sizeof *tprops, GFP_KERNEL);
	if (!tprops)
		return -ENOMEM;

	ret = ib_query_port(&dev->ib_dev, port_num, tprops);
	if (ret) {
		printk(KERN_WARNING "ib_query_port failed (%d) for %s port %d\n",
		       ret, dev->ib_dev.name, port_num);
		goto out;
	}

	dev->rate[port_num - 1] = tprops->active_speed *
				  ib_width_enum_to_int(tprops->active_width);

out:
	kfree(tprops);
	return ret;
}

static void update_sm_ah(struct mthca_dev *dev,
			 u8 port_num, u16 lid, u8 sl)
{
	struct ib_ah *new_ah;
	struct ib_ah_attr ah_attr;
	unsigned long flags;

	if (!dev->send_agent[port_num - 1][0])
		return;

	memset(&ah_attr, 0, sizeof ah_attr);
	ah_attr.dlid     = lid;
	ah_attr.sl       = sl;
	ah_attr.port_num = port_num;

	new_ah = ib_create_ah(dev->send_agent[port_num - 1][0]->qp->pd,
			      &ah_attr);
	if (IS_ERR(new_ah))
		return;

	spin_lock_irqsave(&dev->sm_lock, flags);
	if (dev->sm_ah[port_num - 1])
		ib_destroy_ah(dev->sm_ah[port_num - 1]);
	dev->sm_ah[port_num - 1] = new_ah;
	spin_unlock_irqrestore(&dev->sm_lock, flags);
}

/*
 * Snoop SM MADs for port info and P_Key table sets, so we can
 * synthesize LID change and P_Key change events.
 */
static void smp_snoop(struct ib_device *ibdev,
		      u8 port_num,
		      struct ib_mad *mad)
{
	struct ib_event event;

	if ((mad->mad_hdr.mgmt_class  == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
	     mad->mad_hdr.mgmt_class  == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
	    mad->mad_hdr.method     == IB_MGMT_METHOD_SET) {
		if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PORT_INFO) {
			mthca_update_rate(to_mdev(ibdev), port_num);
			update_sm_ah(to_mdev(ibdev), port_num,
				     be16_to_cpup((__be16 *) (mad->data + 58)),
				     (*(u8 *) (mad->data + 76)) & 0xf);

			event.device           = ibdev;
			event.event            = IB_EVENT_LID_CHANGE;
			event.element.port_num = port_num;
			ib_dispatch_event(&event);
		}

		if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PKEY_TABLE) {
			event.device           = ibdev;
			event.event            = IB_EVENT_PKEY_CHANGE;
			event.element.port_num = port_num;
			ib_dispatch_event(&event);
		}
	}
}

static void node_desc_override(struct ib_device *dev,
			       struct ib_mad *mad)
{
	if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
	     mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
	    mad->mad_hdr.method == IB_MGMT_METHOD_GET_RESP &&
	    mad->mad_hdr.attr_id == IB_SMP_ATTR_NODE_DESC) {
		mutex_lock(&to_mdev(dev)->cap_mask_mutex);
		memcpy(((struct ib_smp *) mad)->data, dev->node_desc, 64);
		mutex_unlock(&to_mdev(dev)->cap_mask_mutex);
	}
}

static void forward_trap(struct mthca_dev *dev,
			 u8 port_num,
			 struct ib_mad *mad)
{
	int qpn = mad->mad_hdr.mgmt_class != IB_MGMT_CLASS_SUBN_LID_ROUTED;
	struct ib_mad_send_buf *send_buf;
	struct ib_mad_agent *agent = dev->send_agent[port_num - 1][qpn];
	int ret;
	unsigned long flags;

	if (agent) {
		send_buf = ib_create_send_mad(agent, qpn, 0, 0, IB_MGMT_MAD_HDR,
					      IB_MGMT_MAD_DATA, GFP_ATOMIC);
		/*
		 * We rely here on the fact that MLX QPs don't use the
		 * address handle after the send is posted (this is
		 * wrong following the IB spec strictly, but we know
		 * it's OK for our devices).
		 */
		spin_lock_irqsave(&dev->sm_lock, flags);
		memcpy(send_buf->mad, mad, sizeof *mad);
		if ((send_buf->ah = dev->sm_ah[port_num - 1]))
			ret = ib_post_send_mad(send_buf, NULL);
		else
			ret = -EINVAL;
		spin_unlock_irqrestore(&dev->sm_lock, flags);

		if (ret)
			ib_free_send_mad(send_buf);
	}
}

int mthca_process_mad(struct ib_device *ibdev,
		      int mad_flags,
		      u8 port_num,
		      struct ib_wc *in_wc,
		      struct ib_grh *in_grh,
		      struct ib_mad *in_mad,
		      struct ib_mad *out_mad)
{
	int err;
	u8 status;
	u16 slid = in_wc ? in_wc->slid : be16_to_cpu(IB_LID_PERMISSIVE);

	/* Forward locally generated traps to the SM */
	if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP &&
	    slid == 0) {
		forward_trap(to_mdev(ibdev), port_num, in_mad);
		return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
	}

	/*
	 * Only handle SM gets, sets and trap represses for SM class
	 *
	 * Only handle PMA and Mellanox vendor-specific class gets and
	 * sets for other classes.
	 */
	if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
	    in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
		if (in_mad->mad_hdr.method   != IB_MGMT_METHOD_GET &&
		    in_mad->mad_hdr.method   != IB_MGMT_METHOD_SET &&
		    in_mad->mad_hdr.method   != IB_MGMT_METHOD_TRAP_REPRESS)
			return IB_MAD_RESULT_SUCCESS;

		/*
		 * Don't process SMInfo queries or vendor-specific
		 * MADs -- the SMA can't handle them.
		 */
		if (in_mad->mad_hdr.attr_id == IB_SMP_ATTR_SM_INFO ||
		    ((in_mad->mad_hdr.attr_id & IB_SMP_ATTR_VENDOR_MASK) ==
		     IB_SMP_ATTR_VENDOR_MASK))
			return IB_MAD_RESULT_SUCCESS;
	} else if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_PERF_MGMT ||
		   in_mad->mad_hdr.mgmt_class == MTHCA_VENDOR_CLASS1     ||
		   in_mad->mad_hdr.mgmt_class == MTHCA_VENDOR_CLASS2) {
		if (in_mad->mad_hdr.method  != IB_MGMT_METHOD_GET &&
		    in_mad->mad_hdr.method  != IB_MGMT_METHOD_SET)
			return IB_MAD_RESULT_SUCCESS;
	} else
		return IB_MAD_RESULT_SUCCESS;

	err = mthca_MAD_IFC(to_mdev(ibdev),
			    mad_flags & IB_MAD_IGNORE_MKEY,
			    mad_flags & IB_MAD_IGNORE_BKEY,
			    port_num, in_wc, in_grh, in_mad, out_mad,
			    &status);
	if (err) {
		mthca_err(to_mdev(ibdev), "MAD_IFC failed\n");
		return IB_MAD_RESULT_FAILURE;
	}
	if (status == MTHCA_CMD_STAT_BAD_PKT)
		return IB_MAD_RESULT_SUCCESS;
	if (status) {
		mthca_err(to_mdev(ibdev), "MAD_IFC returned status %02x\n",
			  status);
		return IB_MAD_RESULT_FAILURE;
	}

	if (!out_mad->mad_hdr.status) {
		smp_snoop(ibdev, port_num, in_mad);
		node_desc_override(ibdev, out_mad);
	}

	/* set return bit in status of directed route responses */
	if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
		out_mad->mad_hdr.status |= cpu_to_be16(1 << 15);

	if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS)
		/* no response for trap repress */
		return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;

	return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY;
}

static void send_handler(struct ib_mad_agent *agent,
			 struct ib_mad_send_wc *mad_send_wc)
{
	ib_free_send_mad(mad_send_wc->send_buf);
}

int mthca_create_agents(struct mthca_dev *dev)
{
	struct ib_mad_agent *agent;
	int p, q;
	int ret;

	spin_lock_init(&dev->sm_lock);

	for (p = 0; p < dev->limits.num_ports; ++p)
		for (q = 0; q <= 1; ++q) {
			agent = ib_register_mad_agent(&dev->ib_dev, p + 1,
						      q ? IB_QPT_GSI : IB_QPT_SMI,
						      NULL, 0, send_handler,
						      NULL, NULL);
			if (IS_ERR(agent)) {
				ret = PTR_ERR(agent);
				goto err;
			}
			dev->send_agent[p][q] = agent;
		}


	for (p = 1; p <= dev->limits.num_ports; ++p) {
		ret = mthca_update_rate(dev, p);
		if (ret) {
			mthca_err(dev, "Failed to obtain port %d rate."
				  " aborting.\n", p);
			goto err;
		}
	}

	return 0;

err:
	for (p = 0; p < dev->limits.num_ports; ++p)
		for (q = 0; q <= 1; ++q)
			if (dev->send_agent[p][q])
				ib_unregister_mad_agent(dev->send_agent[p][q]);

	return ret;
}

void __devexit mthca_free_agents(struct mthca_dev *dev)
{
	struct ib_mad_agent *agent;
	int p, q;

	for (p = 0; p < dev->limits.num_ports; ++p) {
		for (q = 0; q <= 1; ++q) {
			agent = dev->send_agent[p][q];
			dev->send_agent[p][q] = NULL;
			ib_unregister_mad_agent(agent);
		}

		if (dev->sm_ah[p])
			ib_destroy_ah(dev->sm_ah[p]);
	}
}
Commit	Line	Data
1da177e4 LT	1	/*
1da177e4 LT	2	* Copyright (c) 2004 Topspin Communications. All rights reserved.
2a1d9b7f RD	3	* Copyright (c) 2005 Mellanox Technologies. All rights reserved.
2a1d9b7f RD	4	* Copyright (c) 2004 Voltaire, Inc. All rights reserved.
1da177e4 LT	5	*
	6	* This software is available to you under a choice of one of two
	7	* licenses. You may choose to be licensed under the terms of the GNU
	8	* General Public License (GPL) Version 2, available from the file
	9	* COPYING in the main directory of this source tree, or the
	10	* OpenIB.org BSD license below:
	11	*
	12	* Redistribution and use in source and binary forms, with or
	13	* without modification, are permitted provided that the following
	14	* conditions are met:
	15	*
	16	* - Redistributions of source code must retain the above
	17	* copyright notice, this list of conditions and the following
	18	* disclaimer.
	19	*
	20	* - Redistributions in binary form must reproduce the above
	21	* copyright notice, this list of conditions and the following
	22	* disclaimer in the documentation and/or other materials
	23	* provided with the distribution.
	24	*
	25	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
	26	* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
	27	* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
	28	* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
	29	* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
	30	* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
	31	* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
	32	* SOFTWARE.
	33	*
	34	* $Id: mthca_mad.c 1349 2004-12-16 21:09:43Z roland $
	35	*/
	36
4e57b681 TS	37	#include <linux/string.h>
	38	#include <linux/slab.h>
	39
a4d61e84 RD	40	#include <rdma/ib_verbs.h>
	41	#include <rdma/ib_mad.h>
	42	#include <rdma/ib_smi.h>
1da177e4 LT	43
	44	#include "mthca_dev.h"
	45	#include "mthca_cmd.h"
	46
	47	enum {
	48	MTHCA_VENDOR_CLASS1 = 0x9,
	49	MTHCA_VENDOR_CLASS2 = 0xa
	50	};
	51
bf6a9e31 JM	52	int mthca_update_rate(struct mthca_dev *dev, u8 port_num)
	53	{
	54	struct ib_port_attr *tprops = NULL;
	55	int ret;
	56
	57	tprops = kmalloc(sizeof *tprops, GFP_KERNEL);
	58	if (!tprops)
	59	return -ENOMEM;
	60
	61	ret = ib_query_port(&dev->ib_dev, port_num, tprops);
	62	if (ret) {
	63	printk(KERN_WARNING "ib_query_port failed (%d) for %s port %d\n",
	64	ret, dev->ib_dev.name, port_num);
	65	goto out;
	66	}
	67
	68	dev->rate[port_num - 1] = tprops->active_speed *
	69	ib_width_enum_to_int(tprops->active_width);
	70
	71	out:
	72	kfree(tprops);
	73	return ret;
	74	}
	75
1da177e4 LT	76	static void update_sm_ah(struct mthca_dev *dev,
	77	u8 port_num, u16 lid, u8 sl)
	78	{
	79	struct ib_ah *new_ah;
	80	struct ib_ah_attr ah_attr;
	81	unsigned long flags;
	82
	83	if (!dev->send_agent[port_num - 1][0])
	84	return;
	85
	86	memset(&ah_attr, 0, sizeof ah_attr);
	87	ah_attr.dlid = lid;
	88	ah_attr.sl = sl;
	89	ah_attr.port_num = port_num;
	90
	91	new_ah = ib_create_ah(dev->send_agent[port_num - 1][0]->qp->pd,
	92	&ah_attr);
	93	if (IS_ERR(new_ah))
	94	return;
	95
	96	spin_lock_irqsave(&dev->sm_lock, flags);
	97	if (dev->sm_ah[port_num - 1])
	98	ib_destroy_ah(dev->sm_ah[port_num - 1]);
	99	dev->sm_ah[port_num - 1] = new_ah;
	100	spin_unlock_irqrestore(&dev->sm_lock, flags);
	101	}
	102
	103	/*
	104	* Snoop SM MADs for port info and P_Key table sets, so we can
	105	* synthesize LID change and P_Key change events.
	106	*/
	107	static void smp_snoop(struct ib_device *ibdev,
	108	u8 port_num,
	109	struct ib_mad *mad)
	110	{
	111	struct ib_event event;
	112
	113	if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED \|\|
	114	mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
	115	mad->mad_hdr.method == IB_MGMT_METHOD_SET) {
	116	if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PORT_INFO) {
bf6a9e31	117	mthca_update_rate(to_mdev(ibdev), port_num);
1da177e4 LT	118	update_sm_ah(to_mdev(ibdev), port_num,
	119	be16_to_cpup((__be16 *) (mad->data + 58)),
	120	((u8 ) (mad->data + 76)) & 0xf);
	121
	122	event.device = ibdev;
	123	event.event = IB_EVENT_LID_CHANGE;
	124	event.element.port_num = port_num;
	125	ib_dispatch_event(&event);
	126	}
	127
	128	if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PKEY_TABLE) {
	129	event.device = ibdev;
	130	event.event = IB_EVENT_PKEY_CHANGE;
	131	event.element.port_num = port_num;
	132	ib_dispatch_event(&event);
	133	}
	134	}
	135	}
	136
6dfc3901 RD	137	static void node_desc_override(struct ib_device *dev,
	138	struct ib_mad *mad)
	139	{
	140	if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED \|\|
	141	mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
	142	mad->mad_hdr.method == IB_MGMT_METHOD_GET_RESP &&
	143	mad->mad_hdr.attr_id == IB_SMP_ATTR_NODE_DESC) {
	144	mutex_lock(&to_mdev(dev)->cap_mask_mutex);
	145	memcpy(((struct ib_smp *) mad)->data, dev->node_desc, 64);
	146	mutex_unlock(&to_mdev(dev)->cap_mask_mutex);
	147	}
	148	}
	149
1da177e4 LT	150	static void forward_trap(struct mthca_dev *dev,
	151	u8 port_num,
	152	struct ib_mad *mad)
	153	{
	154	int qpn = mad->mad_hdr.mgmt_class != IB_MGMT_CLASS_SUBN_LID_ROUTED;
34816ad9	155	struct ib_mad_send_buf *send_buf;
1da177e4 LT	156	struct ib_mad_agent *agent = dev->send_agent[port_num - 1][qpn];
	157	int ret;
	158	unsigned long flags;
	159
	160	if (agent) {
34816ad9 SH	161	send_buf = ib_create_send_mad(agent, qpn, 0, 0, IB_MGMT_MAD_HDR,
34816ad9 SH	162	IB_MGMT_MAD_DATA, GFP_ATOMIC);
1da177e4 LT	163	/*
	164	* We rely here on the fact that MLX QPs don't use the
	165	* address handle after the send is posted (this is
	166	* wrong following the IB spec strictly, but we know
	167	* it's OK for our devices).
	168	*/
	169	spin_lock_irqsave(&dev->sm_lock, flags);
34816ad9 SH	170	memcpy(send_buf->mad, mad, sizeof *mad);
	171	if ((send_buf->ah = dev->sm_ah[port_num - 1]))
	172	ret = ib_post_send_mad(send_buf, NULL);
1da177e4 LT	173	else
	174	ret = -EINVAL;
	175	spin_unlock_irqrestore(&dev->sm_lock, flags);
	176
34816ad9 SH	177	if (ret)
34816ad9 SH	178	ib_free_send_mad(send_buf);
1da177e4 LT	179	}
	180	}
	181
	182	int mthca_process_mad(struct ib_device *ibdev,
	183	int mad_flags,
	184	u8 port_num,
	185	struct ib_wc *in_wc,
	186	struct ib_grh *in_grh,
	187	struct ib_mad *in_mad,
	188	struct ib_mad *out_mad)
	189	{
	190	int err;
	191	u8 status;
97f52eb4	192	u16 slid = in_wc ? in_wc->slid : be16_to_cpu(IB_LID_PERMISSIVE);
1da177e4 LT	193
	194	/* Forward locally generated traps to the SM */
	195	if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP &&
	196	slid == 0) {
	197	forward_trap(to_mdev(ibdev), port_num, in_mad);
	198	return IB_MAD_RESULT_SUCCESS \| IB_MAD_RESULT_CONSUMED;
	199	}
	200
	201	/*
	202	* Only handle SM gets, sets and trap represses for SM class
	203	*
	204	* Only handle PMA and Mellanox vendor-specific class gets and
	205	* sets for other classes.
	206	*/
	207	if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED \|\|
	208	in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
	209	if (in_mad->mad_hdr.method != IB_MGMT_METHOD_GET &&
	210	in_mad->mad_hdr.method != IB_MGMT_METHOD_SET &&
	211	in_mad->mad_hdr.method != IB_MGMT_METHOD_TRAP_REPRESS)
	212	return IB_MAD_RESULT_SUCCESS;
	213
	214	/*
	215	* Don't process SMInfo queries or vendor-specific
	216	* MADs -- the SMA can't handle them.
	217	*/
	218	if (in_mad->mad_hdr.attr_id == IB_SMP_ATTR_SM_INFO \|\|
	219	((in_mad->mad_hdr.attr_id & IB_SMP_ATTR_VENDOR_MASK) ==
	220	IB_SMP_ATTR_VENDOR_MASK))
	221	return IB_MAD_RESULT_SUCCESS;
	222	} else if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_PERF_MGMT \|\|
	223	in_mad->mad_hdr.mgmt_class == MTHCA_VENDOR_CLASS1 \|\|
	224	in_mad->mad_hdr.mgmt_class == MTHCA_VENDOR_CLASS2) {
	225	if (in_mad->mad_hdr.method != IB_MGMT_METHOD_GET &&
	226	in_mad->mad_hdr.method != IB_MGMT_METHOD_SET)
	227	return IB_MAD_RESULT_SUCCESS;
	228	} else
	229	return IB_MAD_RESULT_SUCCESS;
	230
	231	err = mthca_MAD_IFC(to_mdev(ibdev),
	232	mad_flags & IB_MAD_IGNORE_MKEY,
	233	mad_flags & IB_MAD_IGNORE_BKEY,
	234	port_num, in_wc, in_grh, in_mad, out_mad,
	235	&status);
	236	if (err) {
	237	mthca_err(to_mdev(ibdev), "MAD_IFC failed\n");
	238	return IB_MAD_RESULT_FAILURE;
	239	}
	240	if (status == MTHCA_CMD_STAT_BAD_PKT)
	241	return IB_MAD_RESULT_SUCCESS;
	242	if (status) {
	243	mthca_err(to_mdev(ibdev), "MAD_IFC returned status %02x\n",
	244	status);
	245	return IB_MAD_RESULT_FAILURE;
	246	}
	247
6dfc3901	248	if (!out_mad->mad_hdr.status) {
1da177e4	249	smp_snoop(ibdev, port_num, in_mad);
6dfc3901 RD	250	node_desc_override(ibdev, out_mad);
6dfc3901 RD	251	}
1da177e4 LT	252
	253	/* set return bit in status of directed route responses */
	254	if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
	255	out_mad->mad_hdr.status \|= cpu_to_be16(1 << 15);
	256
	257	if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS)
	258	/* no response for trap repress */
	259	return IB_MAD_RESULT_SUCCESS \| IB_MAD_RESULT_CONSUMED;
	260
	261	return IB_MAD_RESULT_SUCCESS \| IB_MAD_RESULT_REPLY;
	262	}
	263
	264	static void send_handler(struct ib_mad_agent *agent,
	265	struct ib_mad_send_wc *mad_send_wc)
	266	{
34816ad9	267	ib_free_send_mad(mad_send_wc->send_buf);
1da177e4 LT	268	}
	269
	270	int mthca_create_agents(struct mthca_dev *dev)
	271	{
	272	struct ib_mad_agent *agent;
	273	int p, q;
bf6a9e31	274	int ret;
1da177e4 LT	275
	276	spin_lock_init(&dev->sm_lock);
	277
	278	for (p = 0; p < dev->limits.num_ports; ++p)
	279	for (q = 0; q <= 1; ++q) {
	280	agent = ib_register_mad_agent(&dev->ib_dev, p + 1,
	281	q ? IB_QPT_GSI : IB_QPT_SMI,
	282	NULL, 0, send_handler,
	283	NULL, NULL);
bf6a9e31 JM	284	if (IS_ERR(agent)) {
bf6a9e31 JM	285	ret = PTR_ERR(agent);
1da177e4	286	goto err;
bf6a9e31	287	}
1da177e4 LT	288	dev->send_agent[p][q] = agent;
	289	}
	290
bf6a9e31 JM	291
	292	for (p = 1; p <= dev->limits.num_ports; ++p) {
	293	ret = mthca_update_rate(dev, p);
	294	if (ret) {
	295	mthca_err(dev, "Failed to obtain port %d rate."
	296	" aborting.\n", p);
	297	goto err;
	298	}
	299	}
	300
1da177e4 LT	301	return 0;
	302
	303	err:
	304	for (p = 0; p < dev->limits.num_ports; ++p)
	305	for (q = 0; q <= 1; ++q)
	306	if (dev->send_agent[p][q])
	307	ib_unregister_mad_agent(dev->send_agent[p][q]);
	308
bf6a9e31	309	return ret;
1da177e4 LT	310	}
1da177e4 LT	311
e1f7868c	312	void __devexit mthca_free_agents(struct mthca_dev *dev)
1da177e4 LT	313	{
	314	struct ib_mad_agent *agent;
	315	int p, q;
	316
	317	for (p = 0; p < dev->limits.num_ports; ++p) {
	318	for (q = 0; q <= 1; ++q) {
	319	agent = dev->send_agent[p][q];
	320	dev->send_agent[p][q] = NULL;
	321	ib_unregister_mad_agent(agent);
	322	}
	323
	324	if (dev->sm_ah[p])
	325	ib_destroy_ah(dev->sm_ah[p]);
	326	}
	327	}