drivers/infiniband/core/agent.c - third_party/kernel - Git at Google

 /*
  * 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.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:
 	rdma_destroy_ah(ah, RDMA_DESTROY_AH_SLEEPABLE);
 }

 static void agent_send_handler(struct ib_mad_agent *mad_agent,
 			       struct ib_mad_send_wc *mad_send_wc)
 {
 	rdma_destroy_ah(mad_send_wc->send_buf->ah, RDMA_DESTROY_AH_SLEEPABLE);
 	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) {
 		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;
 }
	/*
	* 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.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:
	rdma_destroy_ah(ah, RDMA_DESTROY_AH_SLEEPABLE);
	}

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