[GitHub/mt8127/android_kernel_alcatel_ttab.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[0]->device == device &&
		    entry->agent[0]->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;
}

int 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;
	int ret;
	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) {
		printk(KERN_ERR SPFX "Unable to find port agent\n");
		return -ENODEV;
	}

	agent = port_priv->agent[qpn];
	ah = ib_create_ah_from_wc(agent->qp->pd, wc, grh, port_num);
	if (IS_ERR(ah)) {
		ret = PTR_ERR(ah);
		printk(KERN_ERR SPFX "ib_create_ah_from_wc error:%d\n", ret);
		return ret;
	}

	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)) {
		ret = PTR_ERR(send_buf);
		printk(KERN_ERR SPFX "ib_create_send_mad error:%d\n", ret);
		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 ((ret = ib_post_send_mad(send_buf, NULL))) {
		printk(KERN_ERR SPFX "ib_post_send_mad error:%d\n", ret);
		goto err2;
	}
	return 0;
err2:
	ib_free_send_mad(send_buf);
err1:
	ib_destroy_ah(ah);
	return ret;
}

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) {
		printk(KERN_ERR SPFX "No memory for ib_agent_port_private\n");
		ret = -ENOMEM;
		goto error1;
	}

	/* 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:
	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);
		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->agent[1]);
	ib_unregister_mad_agent(port_priv->agent[0]);
	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.
1bae4dbf	6	* Copyright (c) 2004-2007 Voltaire Corporation. All rights reserved.
2a1d9b7f	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	*
1da177e4 LT	37	*/
1da177e4 LT	38
8c65b4a6 TS	39	#include <linux/slab.h>
	40	#include <linux/string.h>
	41
34816ad9 SH	42	#include "agent.h"
34816ad9 SH	43	#include "smi.h"
1bae4dbf	44	#include "mad_priv.h"
1da177e4	45
34816ad9	46	#define SPFX "ib_agent: "
1da177e4	47
34816ad9 SH	48	struct ib_agent_port_private {
	49	struct list_head port_list;
	50	struct ib_mad_agent *agent[2];
	51	};
1da177e4	52
34816ad9	53	static DEFINE_SPINLOCK(ib_agent_port_list_lock);
1da177e4 LT	54	static LIST_HEAD(ib_agent_port_list);
1da177e4 LT	55
34816ad9 SH	56	static struct ib_agent_port_private *
34816ad9 SH	57	__ib_get_agent_port(struct ib_device *device, int port_num)
1da177e4 LT	58	{
	59	struct ib_agent_port_private *entry;
	60
34816ad9 SH	61	list_for_each_entry(entry, &ib_agent_port_list, port_list) {
	62	if (entry->agent[0]->device == device &&
	63	entry->agent[0]->port_num == port_num)
	64	return entry;
1da177e4 LT	65	}
	66	return NULL;
	67	}
	68
34816ad9 SH	69	static struct ib_agent_port_private *
34816ad9 SH	70	ib_get_agent_port(struct ib_device *device, int port_num)
1da177e4 LT	71	{
	72	struct ib_agent_port_private *entry;
	73	unsigned long flags;
	74
	75	spin_lock_irqsave(&ib_agent_port_list_lock, flags);
34816ad9	76	entry = __ib_get_agent_port(device, port_num);
1da177e4	77	spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);
1da177e4 LT	78	return entry;
	79	}
	80
34816ad9 SH	81	int 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)
1da177e4	84	{
34816ad9 SH	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	int ret;
1bae4dbf HR	90	struct ib_mad_send_wr_private *mad_send_wr;
	91
	92	if (device->node_type == RDMA_NODE_IB_SWITCH)
	93	port_priv = ib_get_agent_port(device, 0);
	94	else
	95	port_priv = ib_get_agent_port(device, port_num);
1da177e4	96
34816ad9 SH	97	if (!port_priv) {
	98	printk(KERN_ERR SPFX "Unable to find port agent\n");
	99	return -ENODEV;
1da177e4 LT	100	}
1da177e4 LT	101
34816ad9 SH	102	agent = port_priv->agent[qpn];
	103	ah = ib_create_ah_from_wc(agent->qp->pd, wc, grh, port_num);
	104	if (IS_ERR(ah)) {
	105	ret = PTR_ERR(ah);
	106	printk(KERN_ERR SPFX "ib_create_ah_from_wc error:%d\n", ret);
	107	return ret;
1da177e4 LT	108	}
1da177e4 LT	109
34816ad9 SH	110	send_buf = ib_create_send_mad(agent, wc->src_qp, wc->pkey_index, 0,
	111	IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
	112	GFP_KERNEL);
	113	if (IS_ERR(send_buf)) {
	114	ret = PTR_ERR(send_buf);
	115	printk(KERN_ERR SPFX "ib_create_send_mad error:%d\n", ret);
	116	goto err1;
1da177e4	117	}
1da177e4	118
34816ad9 SH	119	memcpy(send_buf->mad, mad, sizeof *mad);
34816ad9 SH	120	send_buf->ah = ah;
1bae4dbf HR	121
	122	if (device->node_type == RDMA_NODE_IB_SWITCH) {
	123	mad_send_wr = container_of(send_buf,
	124	struct ib_mad_send_wr_private,
	125	send_buf);
	126	mad_send_wr->send_wr.wr.ud.port_num = port_num;
	127	}
	128
34816ad9 SH	129	if ((ret = ib_post_send_mad(send_buf, NULL))) {
	130	printk(KERN_ERR SPFX "ib_post_send_mad error:%d\n", ret);
	131	goto err2;
1da177e4	132	}
34816ad9 SH	133	return 0;
	134	err2:
	135	ib_free_send_mad(send_buf);
	136	err1:
	137	ib_destroy_ah(ah);
1da177e4 LT	138	return ret;
	139	}
	140
1da177e4 LT	141	static void agent_send_handler(struct ib_mad_agent *mad_agent,
	142	struct ib_mad_send_wc *mad_send_wc)
	143	{
34816ad9 SH	144	ib_destroy_ah(mad_send_wc->send_buf->ah);
34816ad9 SH	145	ib_free_send_mad(mad_send_wc->send_buf);
1da177e4 LT	146	}
	147
	148	int ib_agent_port_open(struct ib_device *device, int port_num)
	149	{
1da177e4 LT	150	struct ib_agent_port_private *port_priv;
1da177e4 LT	151	unsigned long flags;
34816ad9	152	int ret;
1da177e4 LT	153
1da177e4 LT	154	/* Create new device info */
de6eb66b	155	port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL);
1da177e4 LT	156	if (!port_priv) {
	157	printk(KERN_ERR SPFX "No memory for ib_agent_port_private\n");
	158	ret = -ENOMEM;
	159	goto error1;
	160	}
1da177e4	161
34816ad9 SH	162	/* Obtain send only MAD agent for SMI QP */
	163	port_priv->agent[0] = ib_register_mad_agent(device, port_num,
	164	IB_QPT_SMI, NULL, 0,
1da177e4	165	&agent_send_handler,
34816ad9 SH	166	NULL, NULL);
	167	if (IS_ERR(port_priv->agent[0])) {
	168	ret = PTR_ERR(port_priv->agent[0]);
1da177e4 LT	169	goto error2;
	170	}
	171
34816ad9 SH	172	/* Obtain send only MAD agent for GSI QP */
	173	port_priv->agent[1] = ib_register_mad_agent(device, port_num,
	174	IB_QPT_GSI, NULL, 0,
	175	&agent_send_handler,
	176	NULL, NULL);
	177	if (IS_ERR(port_priv->agent[1])) {
	178	ret = PTR_ERR(port_priv->agent[1]);
1da177e4 LT	179	goto error3;
	180	}
	181
1da177e4 LT	182	spin_lock_irqsave(&ib_agent_port_list_lock, flags);
	183	list_add_tail(&port_priv->port_list, &ib_agent_port_list);
	184	spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);
	185
	186	return 0;
	187
1da177e4	188	error3:
34816ad9	189	ib_unregister_mad_agent(port_priv->agent[0]);
1da177e4 LT	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);
34816ad9	202	port_priv = __ib_get_agent_port(device, port_num);
1da177e4 LT	203	if (port_priv == NULL) {
	204	spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);
	205	printk(KERN_ERR SPFX "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
34816ad9 SH	211	ib_unregister_mad_agent(port_priv->agent[1]);
34816ad9 SH	212	ib_unregister_mad_agent(port_priv->agent[0]);
1da177e4	213	kfree(port_priv);
1da177e4 LT	214	return 0;
1da177e4 LT	215	}