[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) 2004-2007 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(const 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(const 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(const struct ib_mad_hdr *mad_hdr, const struct ib_grh *grh,
			 const struct ib_wc *wc, const struct ib_device *device,
			 int port_num, int qpn, size_t resp_mad_len, bool opa)
{
	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 (rdma_cap_ib_switch(device))
		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;
	}

	if (opa && mad_hdr->base_version != OPA_MGMT_BASE_VERSION)
		resp_mad_len = IB_MGMT_MAD_SIZE;

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

	memcpy(send_buf->mad, mad_hdr, resp_mad_len);
	send_buf->ah = ah;

	if (rdma_cap_ib_switch(device)) {
		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_cap_ib_smi(device, port_num)) {
		/* 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, 0);
		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, 0);
	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
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	56	static struct ib_agent_port_private *
73cdaaee	57	__ib_get_agent_port(const struct ib_device *device, int port_num)
1da177e4 LT	58	{
	59	struct ib_agent_port_private *entry;
	60
34816ad9	61	list_for_each_entry(entry, &ib_agent_port_list, port_list) {
fac70d51 EC	62	if (entry->agent[1]->device == device &&
fac70d51 EC	63	entry->agent[1]->port_num == port_num)
34816ad9	64	return entry;
1da177e4 LT	65	}
	66	return NULL;
	67	}
	68
34816ad9	69	static struct ib_agent_port_private *
73cdaaee	70	ib_get_agent_port(const 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
c9082e51	81	void agent_send_response(const struct ib_mad_hdr mad_hdr, const struct ib_grh grh,
73cdaaee	82	const struct ib_wc wc, const struct ib_device device,
8e4349d1	83	int port_num, int qpn, size_t resp_mad_len, bool opa)
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;
1bae4dbf HR	89	struct ib_mad_send_wr_private *mad_send_wr;
1bae4dbf HR	90
4139032b	91	if (rdma_cap_ib_switch(device))
1bae4dbf HR	92	port_priv = ib_get_agent_port(device, 0);
	93	else
	94	port_priv = ib_get_agent_port(device, port_num);
1da177e4	95
34816ad9	96	if (!port_priv) {
7ef5d4b0	97	dev_err(&device->dev, "Unable to find port agent\n");
8fc394b1	98	return;
1da177e4 LT	99	}
1da177e4 LT	100
34816ad9 SH	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)) {
7ef5d4b0	104	dev_err(&device->dev, "ib_create_ah_from_wc error %ld\n",
1eba843d	105	PTR_ERR(ah));
8fc394b1	106	return;
1da177e4 LT	107	}
1da177e4 LT	108
8e4349d1 IW	109	if (opa && mad_hdr->base_version != OPA_MGMT_BASE_VERSION)
	110	resp_mad_len = IB_MGMT_MAD_SIZE;
	111
34816ad9	112	send_buf = ib_create_send_mad(agent, wc->src_qp, wc->pkey_index, 0,
c9082e51 IW	113	IB_MGMT_MAD_HDR,
c9082e51 IW	114	resp_mad_len - IB_MGMT_MAD_HDR,
da2dfaa3	115	GFP_KERNEL,
8e4349d1	116	mad_hdr->base_version);
34816ad9	117	if (IS_ERR(send_buf)) {
7ef5d4b0	118	dev_err(&device->dev, "ib_create_send_mad error\n");
34816ad9	119	goto err1;
1da177e4	120	}
1da177e4	121
c9082e51	122	memcpy(send_buf->mad, mad_hdr, resp_mad_len);
34816ad9	123	send_buf->ah = ah;
1bae4dbf	124
4139032b	125	if (rdma_cap_ib_switch(device)) {
1bae4dbf HR	126	mad_send_wr = container_of(send_buf,
	127	struct ib_mad_send_wr_private,
	128	send_buf);
	129	mad_send_wr->send_wr.wr.ud.port_num = port_num;
	130	}
	131
8fc394b1	132	if (ib_post_send_mad(send_buf, NULL)) {
7ef5d4b0	133	dev_err(&device->dev, "ib_post_send_mad error\n");
34816ad9	134	goto err2;
1da177e4	135	}
8fc394b1	136	return;
34816ad9 SH	137	err2:
	138	ib_free_send_mad(send_buf);
	139	err1:
	140	ib_destroy_ah(ah);
1da177e4 LT	141	}
1da177e4 LT	142
1da177e4 LT	143	static void agent_send_handler(struct ib_mad_agent *mad_agent,
	144	struct ib_mad_send_wc *mad_send_wc)
	145	{
34816ad9 SH	146	ib_destroy_ah(mad_send_wc->send_buf->ah);
34816ad9 SH	147	ib_free_send_mad(mad_send_wc->send_buf);
1da177e4 LT	148	}
	149
	150	int ib_agent_port_open(struct ib_device *device, int port_num)
	151	{
1da177e4 LT	152	struct ib_agent_port_private *port_priv;
1da177e4 LT	153	unsigned long flags;
34816ad9	154	int ret;
1da177e4 LT	155
1da177e4 LT	156	/* Create new device info */
de6eb66b	157	port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL);
1da177e4	158	if (!port_priv) {
7ef5d4b0	159	dev_err(&device->dev, "No memory for ib_agent_port_private\n");
1da177e4 LT	160	ret = -ENOMEM;
	161	goto error1;
	162	}
1da177e4	163
29541e3a	164	if (rdma_cap_ib_smi(device, port_num)) {
fac70d51 EC	165	/* Obtain send only MAD agent for SMI QP */
	166	port_priv->agent[0] = ib_register_mad_agent(device, port_num,
	167	IB_QPT_SMI, NULL, 0,
	168	&agent_send_handler,
0f29b46d	169	NULL, NULL, 0);
fac70d51 EC	170	if (IS_ERR(port_priv->agent[0])) {
	171	ret = PTR_ERR(port_priv->agent[0]);
	172	goto error2;
	173	}
1da177e4 LT	174	}
1da177e4 LT	175
34816ad9 SH	176	/* Obtain send only MAD agent for GSI QP */
	177	port_priv->agent[1] = ib_register_mad_agent(device, port_num,
	178	IB_QPT_GSI, NULL, 0,
	179	&agent_send_handler,
0f29b46d	180	NULL, NULL, 0);
34816ad9 SH	181	if (IS_ERR(port_priv->agent[1])) {
34816ad9 SH	182	ret = PTR_ERR(port_priv->agent[1]);
1da177e4 LT	183	goto error3;
	184	}
	185
1da177e4 LT	186	spin_lock_irqsave(&ib_agent_port_list_lock, flags);
	187	list_add_tail(&port_priv->port_list, &ib_agent_port_list);
	188	spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);
	189
	190	return 0;
	191
1da177e4	192	error3:
fac70d51 EC	193	if (port_priv->agent[0])
fac70d51 EC	194	ib_unregister_mad_agent(port_priv->agent[0]);
1da177e4 LT	195	error2:
	196	kfree(port_priv);
	197	error1:
	198	return ret;
	199	}
	200
	201	int ib_agent_port_close(struct ib_device *device, int port_num)
	202	{
	203	struct ib_agent_port_private *port_priv;
	204	unsigned long flags;
	205
	206	spin_lock_irqsave(&ib_agent_port_list_lock, flags);
34816ad9	207	port_priv = __ib_get_agent_port(device, port_num);
1da177e4 LT	208	if (port_priv == NULL) {
1da177e4 LT	209	spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);
7ef5d4b0	210	dev_err(&device->dev, "Port %d not found\n", port_num);
1da177e4 LT	211	return -ENODEV;
	212	}
	213	list_del(&port_priv->port_list);
	214	spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);
	215
34816ad9	216	ib_unregister_mad_agent(port_priv->agent[1]);
fac70d51 EC	217	if (port_priv->agent[0])
	218	ib_unregister_mad_agent(port_priv->agent[0]);
	219
1da177e4	220	kfree(port_priv);
1da177e4 LT	221	return 0;
1da177e4 LT	222	}