/* * 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) {		/* Need to check both agent[0] and agent[1], as an agent port		 * may only have one of them		 */		if (entry->agent[0] &&		    entry->agent[0]->device == device &&		    entry->agent[0]->port_num == port_num)			return entry; 		if (entry->agent[1] &&		    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 %pe\n", 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_obj(*port_priv);	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;		}	} 	if (rdma_cap_ib_cm(device, port_num)) {		/* 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); 	if (port_priv->agent[1])		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;}