[linux-2.6-block.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) 2004-2007 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.
 *
 */

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

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

#define SPFX "ib_agent: "

struct ib_agent_port_private {
	struct list_head port_list;
	struct ib_mad_agent *agent[2];
};

static DEFINE_SPINLOCK(ib_agent_port_list_lock);
static LIST_HEAD(ib_agent_port_list);

static struct ib_agent_port_private *
__ib_get_agent_port(struct ib_device *device, int port_num)
{
	struct ib_agent_port_private *entry;

	list_for_each_entry(entry, &ib_agent_port_list, port_list) {
		if (entry->agent[1]->device == device &&
		    entry->agent[1]->port_num == port_num)
			return entry;
	}
	return NULL;
}

static struct ib_agent_port_private *
ib_get_agent_port(struct ib_device *device, int port_num)
{
	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);
	spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);
	return entry;
}

void agent_send_response(struct ib_mad *mad, struct ib_grh *grh,
			 struct ib_wc *wc, struct ib_device *device,
			 int port_num, int qpn)
{
	struct ib_agent_port_private *port_priv;
	struct ib_mad_agent *agent;
	struct ib_mad_send_buf *send_buf;
	struct ib_ah *ah;
	struct ib_mad_send_wr_private *mad_send_wr;

	if (device->node_type == RDMA_NODE_IB_SWITCH)
		port_priv = ib_get_agent_port(device, 0);
	else
		port_priv = ib_get_agent_port(device, port_num);

	if (!port_priv) {
		dev_err(&device->dev, "Unable to find port agent\n");
		return;
	}

	agent = port_priv->agent[qpn];
	ah = ib_create_ah_from_wc(agent->qp->pd, wc, grh, port_num);
	if (IS_ERR(ah)) {
		dev_err(&device->dev, "ib_create_ah_from_wc error %ld\n",
			PTR_ERR(ah));
		return;
	}

	send_buf = ib_create_send_mad(agent, wc->src_qp, wc->pkey_index, 0,
				      IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
				      GFP_KERNEL);
	if (IS_ERR(send_buf)) {
		dev_err(&device->dev, "ib_create_send_mad error\n");
		goto err1;
	}

	memcpy(send_buf->mad, mad, sizeof *mad);
	send_buf->ah = ah;

	if (device->node_type == RDMA_NODE_IB_SWITCH) {
		mad_send_wr = container_of(send_buf,
					   struct ib_mad_send_wr_private,
					   send_buf);
		mad_send_wr->send_wr.wr.ud.port_num = port_num;
	}

	if (ib_post_send_mad(send_buf, NULL)) {
		dev_err(&device->dev, "ib_post_send_mad error\n");
		goto err2;
	}
	return;
err2:
	ib_free_send_mad(send_buf);
err1:
	ib_destroy_ah(ah);
}

static void agent_send_handler(struct ib_mad_agent *mad_agent,
			       struct ib_mad_send_wc *mad_send_wc)
{
	ib_destroy_ah(mad_send_wc->send_buf->ah);
	ib_free_send_mad(mad_send_wc->send_buf);
}

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

	/* Create new device info */
	port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL);
	if (!port_priv) {
		dev_err(&device->dev, "No memory for ib_agent_port_private\n");
		ret = -ENOMEM;
		goto error1;
	}

	if (rdma_port_get_link_layer(device, port_num) == IB_LINK_LAYER_INFINIBAND) {
		/* Obtain send only MAD agent for SMI QP */
		port_priv->agent[0] = ib_register_mad_agent(device, port_num,
							    IB_QPT_SMI, NULL, 0,
							    &agent_send_handler,
							    NULL, NULL);
		if (IS_ERR(port_priv->agent[0])) {
			ret = PTR_ERR(port_priv->agent[0]);
			goto error2;
		}
	}

	/* Obtain send only MAD agent for GSI QP */
	port_priv->agent[1] = ib_register_mad_agent(device, port_num,
						    IB_QPT_GSI, NULL, 0,
						    &agent_send_handler,
						    NULL, NULL);
	if (IS_ERR(port_priv->agent[1])) {
		ret = PTR_ERR(port_priv->agent[1]);
		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:
	if (port_priv->agent[0])
		ib_unregister_mad_agent(port_priv->agent[0]);
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);
	if (port_priv == NULL) {
		spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);
		dev_err(&device->dev, "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->agent[1]);
	if (port_priv->agent[0])
		ib_unregister_mad_agent(port_priv->agent[0]);

	kfree(port_priv);
	return 0;
}
Commit	Line	Data
	1	/*
	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) 2004-2007 Voltaire Corporation. All rights reserved.
	7	* Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
	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	*/
	38
	39	#include <linux/slab.h>
	40	#include <linux/string.h>
	41
	42	#include "agent.h"
	43	#include "smi.h"
	44	#include "mad_priv.h"
	45
	46	#define SPFX "ib_agent: "
	47
	48	struct ib_agent_port_private {
	49	struct list_head port_list;
	50	struct ib_mad_agent *agent[2];
	51	};
	52
	53	static DEFINE_SPINLOCK(ib_agent_port_list_lock);
	54	static LIST_HEAD(ib_agent_port_list);
	55
	56	static struct ib_agent_port_private *
	57	__ib_get_agent_port(struct ib_device *device, int port_num)
	58	{
	59	struct ib_agent_port_private *entry;
	60
	61	list_for_each_entry(entry, &ib_agent_port_list, port_list) {
	62	if (entry->agent[1]->device == device &&
	63	entry->agent[1]->port_num == port_num)
	64	return entry;
	65	}
	66	return NULL;
	67	}
	68
	69	static struct ib_agent_port_private *
	70	ib_get_agent_port(struct ib_device *device, int port_num)
	71	{
	72	struct ib_agent_port_private *entry;
	73	unsigned long flags;
	74
	75	spin_lock_irqsave(&ib_agent_port_list_lock, flags);
	76	entry = __ib_get_agent_port(device, port_num);
	77	spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);
	78	return entry;
	79	}
	80
	81	void agent_send_response(struct ib_mad mad, struct ib_grh grh,
	82	struct ib_wc wc, struct ib_device device,
	83	int port_num, int qpn)
	84	{
	85	struct ib_agent_port_private *port_priv;
	86	struct ib_mad_agent *agent;
	87	struct ib_mad_send_buf *send_buf;
	88	struct ib_ah *ah;
	89	struct ib_mad_send_wr_private *mad_send_wr;
	90
	91	if (device->node_type == RDMA_NODE_IB_SWITCH)
	92	port_priv = ib_get_agent_port(device, 0);
	93	else
	94	port_priv = ib_get_agent_port(device, port_num);
	95
	96	if (!port_priv) {
	97	dev_err(&device->dev, "Unable to find port agent\n");
	98	return;
	99	}
	100
	101	agent = port_priv->agent[qpn];
	102	ah = ib_create_ah_from_wc(agent->qp->pd, wc, grh, port_num);
	103	if (IS_ERR(ah)) {
	104	dev_err(&device->dev, "ib_create_ah_from_wc error %ld\n",
	105	PTR_ERR(ah));
	106	return;
	107	}
	108
	109	send_buf = ib_create_send_mad(agent, wc->src_qp, wc->pkey_index, 0,
	110	IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
	111	GFP_KERNEL);
	112	if (IS_ERR(send_buf)) {
	113	dev_err(&device->dev, "ib_create_send_mad error\n");
	114	goto err1;
	115	}
	116
	117	memcpy(send_buf->mad, mad, sizeof *mad);
	118	send_buf->ah = ah;
	119
	120	if (device->node_type == RDMA_NODE_IB_SWITCH) {
	121	mad_send_wr = container_of(send_buf,
	122	struct ib_mad_send_wr_private,
	123	send_buf);
	124	mad_send_wr->send_wr.wr.ud.port_num = port_num;
	125	}
	126
	127	if (ib_post_send_mad(send_buf, NULL)) {
	128	dev_err(&device->dev, "ib_post_send_mad error\n");
	129	goto err2;
	130	}
	131	return;
	132	err2:
	133	ib_free_send_mad(send_buf);
	134	err1:
	135	ib_destroy_ah(ah);
	136	}
	137
	138	static void agent_send_handler(struct ib_mad_agent *mad_agent,
	139	struct ib_mad_send_wc *mad_send_wc)
	140	{
	141	ib_destroy_ah(mad_send_wc->send_buf->ah);
	142	ib_free_send_mad(mad_send_wc->send_buf);
	143	}
	144
	145	int ib_agent_port_open(struct ib_device *device, int port_num)
	146	{
	147	struct ib_agent_port_private *port_priv;
	148	unsigned long flags;
	149	int ret;
	150
	151	/* Create new device info */
	152	port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL);
	153	if (!port_priv) {
	154	dev_err(&device->dev, "No memory for ib_agent_port_private\n");
	155	ret = -ENOMEM;
	156	goto error1;
	157	}
	158
	159	if (rdma_port_get_link_layer(device, port_num) == IB_LINK_LAYER_INFINIBAND) {
	160	/* Obtain send only MAD agent for SMI QP */
	161	port_priv->agent[0] = ib_register_mad_agent(device, port_num,
	162	IB_QPT_SMI, NULL, 0,
	163	&agent_send_handler,
	164	NULL, NULL);
	165	if (IS_ERR(port_priv->agent[0])) {
	166	ret = PTR_ERR(port_priv->agent[0]);
	167	goto error2;
	168	}
	169	}
	170
	171	/* Obtain send only MAD agent for GSI QP */
	172	port_priv->agent[1] = ib_register_mad_agent(device, port_num,
	173	IB_QPT_GSI, NULL, 0,
	174	&agent_send_handler,
	175	NULL, NULL);
	176	if (IS_ERR(port_priv->agent[1])) {
	177	ret = PTR_ERR(port_priv->agent[1]);
	178	goto error3;
	179	}
	180
	181	spin_lock_irqsave(&ib_agent_port_list_lock, flags);
	182	list_add_tail(&port_priv->port_list, &ib_agent_port_list);
	183	spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);
	184
	185	return 0;
	186
	187	error3:
	188	if (port_priv->agent[0])
	189	ib_unregister_mad_agent(port_priv->agent[0]);
	190	error2:
	191	kfree(port_priv);
	192	error1:
	193	return ret;
	194	}
	195
	196	int ib_agent_port_close(struct ib_device *device, int port_num)
	197	{
	198	struct ib_agent_port_private *port_priv;
	199	unsigned long flags;
	200
	201	spin_lock_irqsave(&ib_agent_port_list_lock, flags);
	202	port_priv = __ib_get_agent_port(device, port_num);
	203	if (port_priv == NULL) {
	204	spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);
	205	dev_err(&device->dev, "Port %d not found\n", port_num);
	206	return -ENODEV;
	207	}
	208	list_del(&port_priv->port_list);
	209	spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);
	210
	211	ib_unregister_mad_agent(port_priv->agent[1]);
	212	if (port_priv->agent[0])
	213	ib_unregister_mad_agent(port_priv->agent[0]);
	214
	215	kfree(port_priv);
	216	return 0;
	217	}