mad.c 93.6 KB
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/*
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 * Copyright (c) 2004-2007 Voltaire, Inc. All rights reserved.
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 * Copyright (c) 2005 Intel Corporation.  All rights reserved.
 * Copyright (c) 2005 Mellanox Technologies Ltd.  All rights reserved.
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 * Copyright (c) 2009 HNR Consulting. All rights reserved.
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 * Copyright (c) 2014 Intel Corporation.  All rights reserved.
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 *
 * 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.
 *
 */
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

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#include <linux/dma-mapping.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/security.h>
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#include <rdma/ib_cache.h>
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#include "mad_priv.h"
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#include "core_priv.h"
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#include "mad_rmpp.h"
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#include "smi.h"
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#include "opa_smi.h"
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#include "agent.h"

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static int mad_sendq_size = IB_MAD_QP_SEND_SIZE;
static int mad_recvq_size = IB_MAD_QP_RECV_SIZE;
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module_param_named(send_queue_size, mad_sendq_size, int, 0444);
MODULE_PARM_DESC(send_queue_size, "Size of send queue in number of work requests");
module_param_named(recv_queue_size, mad_recvq_size, int, 0444);
MODULE_PARM_DESC(recv_queue_size, "Size of receive queue in number of work requests");

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static struct list_head ib_mad_port_list;
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static atomic_t ib_mad_client_id = ATOMIC_INIT(0);
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/* Port list lock */
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static DEFINE_SPINLOCK(ib_mad_port_list_lock);
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/* Forward declarations */
static int method_in_use(struct ib_mad_mgmt_method_table **method,
			 struct ib_mad_reg_req *mad_reg_req);
static void remove_mad_reg_req(struct ib_mad_agent_private *priv);
static struct ib_mad_agent_private *find_mad_agent(
					struct ib_mad_port_private *port_priv,
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					const struct ib_mad_hdr *mad);
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static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
				    struct ib_mad_private *mad);
static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv);
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static void timeout_sends(struct work_struct *work);
static void local_completions(struct work_struct *work);
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static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
			      struct ib_mad_agent_private *agent_priv,
			      u8 mgmt_class);
static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
			   struct ib_mad_agent_private *agent_priv);
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static bool ib_mad_send_error(struct ib_mad_port_private *port_priv,
			      struct ib_wc *wc);
static void ib_mad_send_done(struct ib_cq *cq, struct ib_wc *wc);
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/*
 * Returns a ib_mad_port_private structure or NULL for a device/port
 * Assumes ib_mad_port_list_lock is being held
 */
static inline struct ib_mad_port_private *
__ib_get_mad_port(struct ib_device *device, int port_num)
{
	struct ib_mad_port_private *entry;

	list_for_each_entry(entry, &ib_mad_port_list, port_list) {
		if (entry->device == device && entry->port_num == port_num)
			return entry;
	}
	return NULL;
}

/*
 * Wrapper function to return a ib_mad_port_private structure or NULL
 * for a device/port
 */
static inline struct ib_mad_port_private *
ib_get_mad_port(struct ib_device *device, int port_num)
{
	struct ib_mad_port_private *entry;
	unsigned long flags;

	spin_lock_irqsave(&ib_mad_port_list_lock, flags);
	entry = __ib_get_mad_port(device, port_num);
	spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);

	return entry;
}

static inline u8 convert_mgmt_class(u8 mgmt_class)
{
	/* Alias IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE to 0 */
	return mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE ?
		0 : mgmt_class;
}

static int get_spl_qp_index(enum ib_qp_type qp_type)
{
	switch (qp_type)
	{
	case IB_QPT_SMI:
		return 0;
	case IB_QPT_GSI:
		return 1;
	default:
		return -1;
	}
}

static int vendor_class_index(u8 mgmt_class)
{
	return mgmt_class - IB_MGMT_CLASS_VENDOR_RANGE2_START;
}

static int is_vendor_class(u8 mgmt_class)
{
	if ((mgmt_class < IB_MGMT_CLASS_VENDOR_RANGE2_START) ||
	    (mgmt_class > IB_MGMT_CLASS_VENDOR_RANGE2_END))
		return 0;
	return 1;
}

static int is_vendor_oui(char *oui)
{
	if (oui[0] || oui[1] || oui[2])
		return 1;
	return 0;
}

static int is_vendor_method_in_use(
		struct ib_mad_mgmt_vendor_class *vendor_class,
		struct ib_mad_reg_req *mad_reg_req)
{
	struct ib_mad_mgmt_method_table *method;
	int i;

	for (i = 0; i < MAX_MGMT_OUI; i++) {
		if (!memcmp(vendor_class->oui[i], mad_reg_req->oui, 3)) {
			method = vendor_class->method_table[i];
			if (method) {
				if (method_in_use(&method, mad_reg_req))
					return 1;
				else
					break;
			}
		}
	}
	return 0;
}

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int ib_response_mad(const struct ib_mad_hdr *hdr)
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{
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	return ((hdr->method & IB_MGMT_METHOD_RESP) ||
		(hdr->method == IB_MGMT_METHOD_TRAP_REPRESS) ||
		((hdr->mgmt_class == IB_MGMT_CLASS_BM) &&
		 (hdr->attr_mod & IB_BM_ATTR_MOD_RESP)));
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}
EXPORT_SYMBOL(ib_response_mad);

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/*
 * ib_register_mad_agent - Register to send/receive MADs
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 *
 * Context: Process context.
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 */
struct ib_mad_agent *ib_register_mad_agent(struct ib_device *device,
					   u8 port_num,
					   enum ib_qp_type qp_type,
					   struct ib_mad_reg_req *mad_reg_req,
					   u8 rmpp_version,
					   ib_mad_send_handler send_handler,
					   ib_mad_recv_handler recv_handler,
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					   void *context,
					   u32 registration_flags)
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{
	struct ib_mad_port_private *port_priv;
	struct ib_mad_agent *ret = ERR_PTR(-EINVAL);
	struct ib_mad_agent_private *mad_agent_priv;
	struct ib_mad_reg_req *reg_req = NULL;
	struct ib_mad_mgmt_class_table *class;
	struct ib_mad_mgmt_vendor_class_table *vendor;
	struct ib_mad_mgmt_vendor_class *vendor_class;
	struct ib_mad_mgmt_method_table *method;
	int ret2, qpn;
	u8 mgmt_class, vclass;

	/* Validate parameters */
	qpn = get_spl_qp_index(qp_type);
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	if (qpn == -1) {
		dev_notice(&device->dev,
			   "ib_register_mad_agent: invalid QP Type %d\n",
			   qp_type);
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		goto error1;
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	}
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	if (rmpp_version && rmpp_version != IB_MGMT_RMPP_VERSION) {
		dev_notice(&device->dev,
			   "ib_register_mad_agent: invalid RMPP Version %u\n",
			   rmpp_version);
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		goto error1;
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	}
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	/* Validate MAD registration request if supplied */
	if (mad_reg_req) {
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		if (mad_reg_req->mgmt_class_version >= MAX_MGMT_VERSION) {
			dev_notice(&device->dev,
				   "ib_register_mad_agent: invalid Class Version %u\n",
				   mad_reg_req->mgmt_class_version);
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			goto error1;
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		}
		if (!recv_handler) {
			dev_notice(&device->dev,
				   "ib_register_mad_agent: no recv_handler\n");
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			goto error1;
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		}
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		if (mad_reg_req->mgmt_class >= MAX_MGMT_CLASS) {
			/*
			 * IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE is the only
			 * one in this range currently allowed
			 */
			if (mad_reg_req->mgmt_class !=
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			    IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
				dev_notice(&device->dev,
					   "ib_register_mad_agent: Invalid Mgmt Class 0x%x\n",
					   mad_reg_req->mgmt_class);
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				goto error1;
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			}
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		} else if (mad_reg_req->mgmt_class == 0) {
			/*
			 * Class 0 is reserved in IBA and is used for
			 * aliasing of IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE
			 */
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			dev_notice(&device->dev,
				   "ib_register_mad_agent: Invalid Mgmt Class 0\n");
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			goto error1;
		} else if (is_vendor_class(mad_reg_req->mgmt_class)) {
			/*
			 * If class is in "new" vendor range,
			 * ensure supplied OUI is not zero
			 */
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			if (!is_vendor_oui(mad_reg_req->oui)) {
				dev_notice(&device->dev,
					   "ib_register_mad_agent: No OUI specified for class 0x%x\n",
					   mad_reg_req->mgmt_class);
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				goto error1;
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			}
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		}
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		/* Make sure class supplied is consistent with RMPP */
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		if (!ib_is_mad_class_rmpp(mad_reg_req->mgmt_class)) {
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			if (rmpp_version) {
				dev_notice(&device->dev,
					   "ib_register_mad_agent: RMPP version for non-RMPP class 0x%x\n",
					   mad_reg_req->mgmt_class);
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				goto error1;
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			}
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		}
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		/* Make sure class supplied is consistent with QP type */
		if (qp_type == IB_QPT_SMI) {
			if ((mad_reg_req->mgmt_class !=
					IB_MGMT_CLASS_SUBN_LID_ROUTED) &&
			    (mad_reg_req->mgmt_class !=
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					IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
				dev_notice(&device->dev,
					   "ib_register_mad_agent: Invalid SM QP type: class 0x%x\n",
					   mad_reg_req->mgmt_class);
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				goto error1;
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			}
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		} else {
			if ((mad_reg_req->mgmt_class ==
					IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
			    (mad_reg_req->mgmt_class ==
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					IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
				dev_notice(&device->dev,
					   "ib_register_mad_agent: Invalid GS QP type: class 0x%x\n",
					   mad_reg_req->mgmt_class);
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				goto error1;
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			}
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		}
	} else {
		/* No registration request supplied */
		if (!send_handler)
			goto error1;
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		if (registration_flags & IB_MAD_USER_RMPP)
			goto error1;
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	}

	/* Validate device and port */
	port_priv = ib_get_mad_port(device, port_num);
	if (!port_priv) {
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		dev_notice(&device->dev,
			   "ib_register_mad_agent: Invalid port %d\n",
			   port_num);
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		ret = ERR_PTR(-ENODEV);
		goto error1;
	}

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	/* Verify the QP requested is supported.  For example, Ethernet devices
	 * will not have QP0 */
	if (!port_priv->qp_info[qpn].qp) {
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		dev_notice(&device->dev,
			   "ib_register_mad_agent: QP %d not supported\n", qpn);
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		ret = ERR_PTR(-EPROTONOSUPPORT);
		goto error1;
	}

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	/* Allocate structures */
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	mad_agent_priv = kzalloc(sizeof *mad_agent_priv, GFP_KERNEL);
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	if (!mad_agent_priv) {
		ret = ERR_PTR(-ENOMEM);
		goto error1;
	}
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	if (mad_reg_req) {
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		reg_req = kmemdup(mad_reg_req, sizeof *reg_req, GFP_KERNEL);
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		if (!reg_req) {
			ret = ERR_PTR(-ENOMEM);
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			goto error3;
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		}
	}

	/* Now, fill in the various structures */
	mad_agent_priv->qp_info = &port_priv->qp_info[qpn];
	mad_agent_priv->reg_req = reg_req;
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	mad_agent_priv->agent.rmpp_version = rmpp_version;
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	mad_agent_priv->agent.device = device;
	mad_agent_priv->agent.recv_handler = recv_handler;
	mad_agent_priv->agent.send_handler = send_handler;
	mad_agent_priv->agent.context = context;
	mad_agent_priv->agent.qp = port_priv->qp_info[qpn].qp;
	mad_agent_priv->agent.port_num = port_num;
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	mad_agent_priv->agent.flags = registration_flags;
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	spin_lock_init(&mad_agent_priv->lock);
	INIT_LIST_HEAD(&mad_agent_priv->send_list);
	INIT_LIST_HEAD(&mad_agent_priv->wait_list);
	INIT_LIST_HEAD(&mad_agent_priv->done_list);
	INIT_LIST_HEAD(&mad_agent_priv->rmpp_list);
	INIT_DELAYED_WORK(&mad_agent_priv->timed_work, timeout_sends);
	INIT_LIST_HEAD(&mad_agent_priv->local_list);
	INIT_WORK(&mad_agent_priv->local_work, local_completions);
	atomic_set(&mad_agent_priv->refcount, 1);
	init_completion(&mad_agent_priv->comp);
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	ret2 = ib_mad_agent_security_setup(&mad_agent_priv->agent, qp_type);
	if (ret2) {
		ret = ERR_PTR(ret2);
		goto error4;
	}

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	spin_lock_irq(&port_priv->reg_lock);
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	mad_agent_priv->agent.hi_tid = atomic_inc_return(&ib_mad_client_id);
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	/*
	 * Make sure MAD registration (if supplied)
	 * is non overlapping with any existing ones
	 */
	if (mad_reg_req) {
		mgmt_class = convert_mgmt_class(mad_reg_req->mgmt_class);
		if (!is_vendor_class(mgmt_class)) {
			class = port_priv->version[mad_reg_req->
						   mgmt_class_version].class;
			if (class) {
				method = class->method_table[mgmt_class];
				if (method) {
					if (method_in_use(&method,
							   mad_reg_req))
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						goto error5;
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				}
			}
			ret2 = add_nonoui_reg_req(mad_reg_req, mad_agent_priv,
						  mgmt_class);
		} else {
			/* "New" vendor class range */
			vendor = port_priv->version[mad_reg_req->
						    mgmt_class_version].vendor;
			if (vendor) {
				vclass = vendor_class_index(mgmt_class);
				vendor_class = vendor->vendor_class[vclass];
				if (vendor_class) {
					if (is_vendor_method_in_use(
							vendor_class,
							mad_reg_req))
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						goto error5;
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				}
			}
			ret2 = add_oui_reg_req(mad_reg_req, mad_agent_priv);
		}
		if (ret2) {
			ret = ERR_PTR(ret2);
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			goto error5;
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		}
	}

	/* Add mad agent into port's agent list */
	list_add_tail(&mad_agent_priv->agent_list, &port_priv->agent_list);
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	spin_unlock_irq(&port_priv->reg_lock);
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	return &mad_agent_priv->agent;
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error5:
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	spin_unlock_irq(&port_priv->reg_lock);
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	ib_mad_agent_security_cleanup(&mad_agent_priv->agent);
error4:
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	kfree(reg_req);
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error3:
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	kfree(mad_agent_priv);
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error1:
	return ret;
}
EXPORT_SYMBOL(ib_register_mad_agent);

static inline int is_snooping_sends(int mad_snoop_flags)
{
	return (mad_snoop_flags &
		(/*IB_MAD_SNOOP_POSTED_SENDS |
		 IB_MAD_SNOOP_RMPP_SENDS |*/
		 IB_MAD_SNOOP_SEND_COMPLETIONS /*|
		 IB_MAD_SNOOP_RMPP_SEND_COMPLETIONS*/));
}

static inline int is_snooping_recvs(int mad_snoop_flags)
{
	return (mad_snoop_flags &
		(IB_MAD_SNOOP_RECVS /*|
		 IB_MAD_SNOOP_RMPP_RECVS*/));
}

static int register_snoop_agent(struct ib_mad_qp_info *qp_info,
				struct ib_mad_snoop_private *mad_snoop_priv)
{
	struct ib_mad_snoop_private **new_snoop_table;
	unsigned long flags;
	int i;

	spin_lock_irqsave(&qp_info->snoop_lock, flags);
	/* Check for empty slot in array. */
	for (i = 0; i < qp_info->snoop_table_size; i++)
		if (!qp_info->snoop_table[i])
			break;

	if (i == qp_info->snoop_table_size) {
		/* Grow table. */
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		new_snoop_table = krealloc(qp_info->snoop_table,
					   sizeof mad_snoop_priv *
					   (qp_info->snoop_table_size + 1),
					   GFP_ATOMIC);
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		if (!new_snoop_table) {
			i = -ENOMEM;
			goto out;
		}
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		qp_info->snoop_table = new_snoop_table;
		qp_info->snoop_table_size++;
	}
	qp_info->snoop_table[i] = mad_snoop_priv;
	atomic_inc(&qp_info->snoop_count);
out:
	spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
	return i;
}

struct ib_mad_agent *ib_register_mad_snoop(struct ib_device *device,
					   u8 port_num,
					   enum ib_qp_type qp_type,
					   int mad_snoop_flags,
					   ib_mad_snoop_handler snoop_handler,
					   ib_mad_recv_handler recv_handler,
					   void *context)
{
	struct ib_mad_port_private *port_priv;
	struct ib_mad_agent *ret;
	struct ib_mad_snoop_private *mad_snoop_priv;
	int qpn;
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	int err;
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	/* Validate parameters */
	if ((is_snooping_sends(mad_snoop_flags) && !snoop_handler) ||
	    (is_snooping_recvs(mad_snoop_flags) && !recv_handler)) {
		ret = ERR_PTR(-EINVAL);
		goto error1;
	}
	qpn = get_spl_qp_index(qp_type);
	if (qpn == -1) {
		ret = ERR_PTR(-EINVAL);
		goto error1;
	}
	port_priv = ib_get_mad_port(device, port_num);
	if (!port_priv) {
		ret = ERR_PTR(-ENODEV);
		goto error1;
	}
	/* Allocate structures */
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	mad_snoop_priv = kzalloc(sizeof *mad_snoop_priv, GFP_KERNEL);
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	if (!mad_snoop_priv) {
		ret = ERR_PTR(-ENOMEM);
		goto error1;
	}

	/* Now, fill in the various structures */
	mad_snoop_priv->qp_info = &port_priv->qp_info[qpn];
	mad_snoop_priv->agent.device = device;
	mad_snoop_priv->agent.recv_handler = recv_handler;
	mad_snoop_priv->agent.snoop_handler = snoop_handler;
	mad_snoop_priv->agent.context = context;
	mad_snoop_priv->agent.qp = port_priv->qp_info[qpn].qp;
	mad_snoop_priv->agent.port_num = port_num;
	mad_snoop_priv->mad_snoop_flags = mad_snoop_flags;
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Sean Hefty 已提交
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	init_completion(&mad_snoop_priv->comp);
538 539 540 541 542 543 544

	err = ib_mad_agent_security_setup(&mad_snoop_priv->agent, qp_type);
	if (err) {
		ret = ERR_PTR(err);
		goto error2;
	}

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	mad_snoop_priv->snoop_index = register_snoop_agent(
						&port_priv->qp_info[qpn],
						mad_snoop_priv);
	if (mad_snoop_priv->snoop_index < 0) {
		ret = ERR_PTR(mad_snoop_priv->snoop_index);
550
		goto error3;
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	}

	atomic_set(&mad_snoop_priv->refcount, 1);
	return &mad_snoop_priv->agent;
555 556
error3:
	ib_mad_agent_security_cleanup(&mad_snoop_priv->agent);
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error2:
	kfree(mad_snoop_priv);
error1:
	return ret;
}
EXPORT_SYMBOL(ib_register_mad_snoop);

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static inline void deref_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
{
	if (atomic_dec_and_test(&mad_agent_priv->refcount))
		complete(&mad_agent_priv->comp);
}

static inline void deref_snoop_agent(struct ib_mad_snoop_private *mad_snoop_priv)
{
	if (atomic_dec_and_test(&mad_snoop_priv->refcount))
		complete(&mad_snoop_priv->comp);
}

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static void unregister_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
{
	struct ib_mad_port_private *port_priv;

	/* Note that we could still be handling received MADs */

	/*
	 * Canceling all sends results in dropping received response
	 * MADs, preventing us from queuing additional work
	 */
	cancel_mads(mad_agent_priv);
	port_priv = mad_agent_priv->qp_info->port_priv;
	cancel_delayed_work(&mad_agent_priv->timed_work);

590
	spin_lock_irq(&port_priv->reg_lock);
L
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	remove_mad_reg_req(mad_agent_priv);
	list_del(&mad_agent_priv->agent_list);
593
	spin_unlock_irq(&port_priv->reg_lock);
L
Linus Torvalds 已提交
594

595
	flush_workqueue(port_priv->wq);
596
	ib_cancel_rmpp_recvs(mad_agent_priv);
L
Linus Torvalds 已提交
597

S
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	deref_mad_agent(mad_agent_priv);
	wait_for_completion(&mad_agent_priv->comp);
L
Linus Torvalds 已提交
600

601 602
	ib_mad_agent_security_cleanup(&mad_agent_priv->agent);

603
	kfree(mad_agent_priv->reg_req);
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	kfree(mad_agent_priv);
}

static void unregister_mad_snoop(struct ib_mad_snoop_private *mad_snoop_priv)
{
	struct ib_mad_qp_info *qp_info;
	unsigned long flags;

	qp_info = mad_snoop_priv->qp_info;
	spin_lock_irqsave(&qp_info->snoop_lock, flags);
	qp_info->snoop_table[mad_snoop_priv->snoop_index] = NULL;
	atomic_dec(&qp_info->snoop_count);
	spin_unlock_irqrestore(&qp_info->snoop_lock, flags);

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	deref_snoop_agent(mad_snoop_priv);
	wait_for_completion(&mad_snoop_priv->comp);
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621 622
	ib_mad_agent_security_cleanup(&mad_snoop_priv->agent);

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	kfree(mad_snoop_priv);
}

/*
 * ib_unregister_mad_agent - Unregisters a client from using MAD services
628 629
 *
 * Context: Process context.
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 */
631
void ib_unregister_mad_agent(struct ib_mad_agent *mad_agent)
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{
	struct ib_mad_agent_private *mad_agent_priv;
	struct ib_mad_snoop_private *mad_snoop_priv;

	/* If the TID is zero, the agent can only snoop. */
	if (mad_agent->hi_tid) {
		mad_agent_priv = container_of(mad_agent,
					      struct ib_mad_agent_private,
					      agent);
		unregister_mad_agent(mad_agent_priv);
	} else {
		mad_snoop_priv = container_of(mad_agent,
					      struct ib_mad_snoop_private,
					      agent);
		unregister_mad_snoop(mad_snoop_priv);
	}
}
EXPORT_SYMBOL(ib_unregister_mad_agent);

static void dequeue_mad(struct ib_mad_list_head *mad_list)
{
	struct ib_mad_queue *mad_queue;
	unsigned long flags;

	mad_queue = mad_list->mad_queue;
	spin_lock_irqsave(&mad_queue->lock, flags);
	list_del(&mad_list->list);
	mad_queue->count--;
	spin_unlock_irqrestore(&mad_queue->lock, flags);
}

static void snoop_send(struct ib_mad_qp_info *qp_info,
664
		       struct ib_mad_send_buf *send_buf,
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		       struct ib_mad_send_wc *mad_send_wc,
		       int mad_snoop_flags)
{
	struct ib_mad_snoop_private *mad_snoop_priv;
	unsigned long flags;
	int i;

	spin_lock_irqsave(&qp_info->snoop_lock, flags);
	for (i = 0; i < qp_info->snoop_table_size; i++) {
		mad_snoop_priv = qp_info->snoop_table[i];
		if (!mad_snoop_priv ||
		    !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
			continue;

		atomic_inc(&mad_snoop_priv->refcount);
		spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
		mad_snoop_priv->agent.snoop_handler(&mad_snoop_priv->agent,
682
						    send_buf, mad_send_wc);
S
Sean Hefty 已提交
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		deref_snoop_agent(mad_snoop_priv);
L
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		spin_lock_irqsave(&qp_info->snoop_lock, flags);
	}
	spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
}

static void snoop_recv(struct ib_mad_qp_info *qp_info,
		       struct ib_mad_recv_wc *mad_recv_wc,
		       int mad_snoop_flags)
{
	struct ib_mad_snoop_private *mad_snoop_priv;
	unsigned long flags;
	int i;

	spin_lock_irqsave(&qp_info->snoop_lock, flags);
	for (i = 0; i < qp_info->snoop_table_size; i++) {
		mad_snoop_priv = qp_info->snoop_table[i];
		if (!mad_snoop_priv ||
		    !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
			continue;

		atomic_inc(&mad_snoop_priv->refcount);
		spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
706
		mad_snoop_priv->agent.recv_handler(&mad_snoop_priv->agent, NULL,
L
Linus Torvalds 已提交
707
						   mad_recv_wc);
S
Sean Hefty 已提交
708
		deref_snoop_agent(mad_snoop_priv);
L
Linus Torvalds 已提交
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		spin_lock_irqsave(&qp_info->snoop_lock, flags);
	}
	spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
}

C
Christoph Hellwig 已提交
714 715
static void build_smp_wc(struct ib_qp *qp, struct ib_cqe *cqe, u16 slid,
		u16 pkey_index, u8 port_num, struct ib_wc *wc)
L
Linus Torvalds 已提交
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{
	memset(wc, 0, sizeof *wc);
C
Christoph Hellwig 已提交
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	wc->wr_cqe = cqe;
L
Linus Torvalds 已提交
719 720 721 722 723
	wc->status = IB_WC_SUCCESS;
	wc->opcode = IB_WC_RECV;
	wc->pkey_index = pkey_index;
	wc->byte_len = sizeof(struct ib_mad) + sizeof(struct ib_grh);
	wc->src_qp = IB_QP0;
724
	wc->qp = qp;
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Linus Torvalds 已提交
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	wc->slid = slid;
	wc->sl = 0;
	wc->dlid_path_bits = 0;
	wc->port_num = port_num;
}

731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756
static size_t mad_priv_size(const struct ib_mad_private *mp)
{
	return sizeof(struct ib_mad_private) + mp->mad_size;
}

static struct ib_mad_private *alloc_mad_private(size_t mad_size, gfp_t flags)
{
	size_t size = sizeof(struct ib_mad_private) + mad_size;
	struct ib_mad_private *ret = kzalloc(size, flags);

	if (ret)
		ret->mad_size = mad_size;

	return ret;
}

static size_t port_mad_size(const struct ib_mad_port_private *port_priv)
{
	return rdma_max_mad_size(port_priv->device, port_priv->port_num);
}

static size_t mad_priv_dma_size(const struct ib_mad_private *mp)
{
	return sizeof(struct ib_grh) + mp->mad_size;
}

L
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/*
 * Return 0 if SMP is to be sent
 * Return 1 if SMP was consumed locally (whether or not solicited)
 * Return < 0 if error
 */
static int handle_outgoing_dr_smp(struct ib_mad_agent_private *mad_agent_priv,
763
				  struct ib_mad_send_wr_private *mad_send_wr)
L
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{
765
	int ret = 0;
766
	struct ib_smp *smp = mad_send_wr->send_buf.mad;
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Ira Weiny 已提交
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	struct opa_smp *opa_smp = (struct opa_smp *)smp;
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	unsigned long flags;
	struct ib_mad_local_private *local;
	struct ib_mad_private *mad_priv;
	struct ib_mad_port_private *port_priv;
	struct ib_mad_agent_private *recv_mad_agent = NULL;
	struct ib_device *device = mad_agent_priv->agent.device;
774
	u8 port_num;
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	struct ib_wc mad_wc;
C
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	struct ib_ud_wr *send_wr = &mad_send_wr->send_wr;
777
	size_t mad_size = port_mad_size(mad_agent_priv->qp_info->port_priv);
778
	u16 out_mad_pkey_index = 0;
I
Ira Weiny 已提交
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	u16 drslid;
	bool opa = rdma_cap_opa_mad(mad_agent_priv->qp_info->port_priv->device,
				    mad_agent_priv->qp_info->port_priv->port_num);
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783
	if (rdma_cap_ib_switch(device) &&
784
	    smp->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
C
Christoph Hellwig 已提交
785
		port_num = send_wr->port_num;
786 787 788
	else
		port_num = mad_agent_priv->agent.port_num;

789 790 791 792 793 794
	/*
	 * Directed route handling starts if the initial LID routed part of
	 * a request or the ending LID routed part of a response is empty.
	 * If we are at the start of the LID routed part, don't update the
	 * hop_ptr or hop_cnt.  See section 14.2.2, Vol 1 IB spec.
	 */
795
	if (opa && smp->class_version == OPA_SM_CLASS_VERSION) {
I
Ira Weiny 已提交
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		u32 opa_drslid;

		if ((opa_get_smp_direction(opa_smp)
		     ? opa_smp->route.dr.dr_dlid : opa_smp->route.dr.dr_slid) ==
		     OPA_LID_PERMISSIVE &&
801 802
		     opa_smi_handle_dr_smp_send(opa_smp,
						rdma_cap_ib_switch(device),
I
Ira Weiny 已提交
803 804 805 806 807 808
						port_num) == IB_SMI_DISCARD) {
			ret = -EINVAL;
			dev_err(&device->dev, "OPA Invalid directed route\n");
			goto out;
		}
		opa_drslid = be32_to_cpu(opa_smp->route.dr.dr_slid);
809
		if (opa_drslid != be32_to_cpu(OPA_LID_PERMISSIVE) &&
I
Ira Weiny 已提交
810 811 812 813 814 815 816
		    opa_drslid & 0xffff0000) {
			ret = -EINVAL;
			dev_err(&device->dev, "OPA Invalid dr_slid 0x%x\n",
			       opa_drslid);
			goto out;
		}
		drslid = (u16)(opa_drslid & 0x0000ffff);
817

I
Ira Weiny 已提交
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		/* Check to post send on QP or process locally */
		if (opa_smi_check_local_smp(opa_smp, device) == IB_SMI_DISCARD &&
		    opa_smi_check_local_returning_smp(opa_smp, device) == IB_SMI_DISCARD)
			goto out;
	} else {
		if ((ib_get_smp_direction(smp) ? smp->dr_dlid : smp->dr_slid) ==
		     IB_LID_PERMISSIVE &&
825
		     smi_handle_dr_smp_send(smp, rdma_cap_ib_switch(device), port_num) ==
I
Ira Weiny 已提交
826 827 828 829 830 831 832 833 834 835 836 837
		     IB_SMI_DISCARD) {
			ret = -EINVAL;
			dev_err(&device->dev, "Invalid directed route\n");
			goto out;
		}
		drslid = be16_to_cpu(smp->dr_slid);

		/* Check to post send on QP or process locally */
		if (smi_check_local_smp(smp, device) == IB_SMI_DISCARD &&
		    smi_check_local_returning_smp(smp, device) == IB_SMI_DISCARD)
			goto out;
	}
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	local = kmalloc(sizeof *local, GFP_ATOMIC);
	if (!local) {
		ret = -ENOMEM;
		goto out;
	}
	local->mad_priv = NULL;
	local->recv_mad_agent = NULL;
846
	mad_priv = alloc_mad_private(mad_size, GFP_ATOMIC);
L
Linus Torvalds 已提交
847 848 849 850 851 852
	if (!mad_priv) {
		ret = -ENOMEM;
		kfree(local);
		goto out;
	}

853
	build_smp_wc(mad_agent_priv->agent.qp,
C
Christoph Hellwig 已提交
854
		     send_wr->wr.wr_cqe, drslid,
C
Christoph Hellwig 已提交
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		     send_wr->pkey_index,
		     send_wr->port_num, &mad_wc);
L
Linus Torvalds 已提交
857

I
Ira Weiny 已提交
858 859 860 861 862 863
	if (opa && smp->base_version == OPA_MGMT_BASE_VERSION) {
		mad_wc.byte_len = mad_send_wr->send_buf.hdr_len
					+ mad_send_wr->send_buf.data_len
					+ sizeof(struct ib_grh);
	}

L
Linus Torvalds 已提交
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	/* No GRH for DR SMP */
	ret = device->process_mad(device, 0, port_num, &mad_wc, NULL,
866 867 868
				  (const struct ib_mad_hdr *)smp, mad_size,
				  (struct ib_mad_hdr *)mad_priv->mad,
				  &mad_size, &out_mad_pkey_index);
L
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869 870 871
	switch (ret)
	{
	case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY:
872
		if (ib_response_mad((const struct ib_mad_hdr *)mad_priv->mad) &&
L
Linus Torvalds 已提交
873 874 875 876 877 878 879 880 881
		    mad_agent_priv->agent.recv_handler) {
			local->mad_priv = mad_priv;
			local->recv_mad_agent = mad_agent_priv;
			/*
			 * Reference MAD agent until receive
			 * side of local completion handled
			 */
			atomic_inc(&mad_agent_priv->refcount);
		} else
882
			kfree(mad_priv);
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		break;
	case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED:
885
		kfree(mad_priv);
886
		break;
L
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	case IB_MAD_RESULT_SUCCESS:
		/* Treat like an incoming receive MAD */
		port_priv = ib_get_mad_port(mad_agent_priv->agent.device,
					    mad_agent_priv->agent.port_num);
		if (port_priv) {
892
			memcpy(mad_priv->mad, smp, mad_priv->mad_size);
L
Linus Torvalds 已提交
893
			recv_mad_agent = find_mad_agent(port_priv,
894
						        (const struct ib_mad_hdr *)mad_priv->mad);
L
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895 896
		}
		if (!port_priv || !recv_mad_agent) {
897 898 899 900
			/*
			 * No receiving agent so drop packet and
			 * generate send completion.
			 */
901
			kfree(mad_priv);
902
			break;
L
Linus Torvalds 已提交
903 904 905 906 907
		}
		local->mad_priv = mad_priv;
		local->recv_mad_agent = recv_mad_agent;
		break;
	default:
908
		kfree(mad_priv);
L
Linus Torvalds 已提交
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		kfree(local);
		ret = -EINVAL;
		goto out;
	}

914
	local->mad_send_wr = mad_send_wr;
I
Ira Weiny 已提交
915
	if (opa) {
C
Christoph Hellwig 已提交
916
		local->mad_send_wr->send_wr.pkey_index = out_mad_pkey_index;
I
Ira Weiny 已提交
917 918
		local->return_wc_byte_len = mad_size;
	}
L
Linus Torvalds 已提交
919 920 921 922 923 924 925
	/* Reference MAD agent until send side of local completion handled */
	atomic_inc(&mad_agent_priv->refcount);
	/* Queue local completion to local list */
	spin_lock_irqsave(&mad_agent_priv->lock, flags);
	list_add_tail(&local->completion_list, &mad_agent_priv->local_list);
	spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
	queue_work(mad_agent_priv->qp_info->port_priv->wq,
926
		   &mad_agent_priv->local_work);
L
Linus Torvalds 已提交
927 928 929 930 931
	ret = 1;
out:
	return ret;
}

932
static int get_pad_size(int hdr_len, int data_len, size_t mad_size)
933 934 935
{
	int seg_size, pad;

936
	seg_size = mad_size - hdr_len;
937 938
	if (data_len && seg_size) {
		pad = seg_size - data_len % seg_size;
939
		return pad == seg_size ? 0 : pad;
940
	} else
941 942 943 944 945 946 947 948 949 950 951 952 953 954
		return seg_size;
}

static void free_send_rmpp_list(struct ib_mad_send_wr_private *mad_send_wr)
{
	struct ib_rmpp_segment *s, *t;

	list_for_each_entry_safe(s, t, &mad_send_wr->rmpp_list, list) {
		list_del(&s->list);
		kfree(s);
	}
}

static int alloc_send_rmpp_list(struct ib_mad_send_wr_private *send_wr,
955
				size_t mad_size, gfp_t gfp_mask)
956 957 958 959 960 961
{
	struct ib_mad_send_buf *send_buf = &send_wr->send_buf;
	struct ib_rmpp_mad *rmpp_mad = send_buf->mad;
	struct ib_rmpp_segment *seg = NULL;
	int left, seg_size, pad;

962 963
	send_buf->seg_size = mad_size - send_buf->hdr_len;
	send_buf->seg_rmpp_size = mad_size - IB_MGMT_RMPP_HDR;
964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990
	seg_size = send_buf->seg_size;
	pad = send_wr->pad;

	/* Allocate data segments. */
	for (left = send_buf->data_len + pad; left > 0; left -= seg_size) {
		seg = kmalloc(sizeof (*seg) + seg_size, gfp_mask);
		if (!seg) {
			free_send_rmpp_list(send_wr);
			return -ENOMEM;
		}
		seg->num = ++send_buf->seg_count;
		list_add_tail(&seg->list, &send_wr->rmpp_list);
	}

	/* Zero any padding */
	if (pad)
		memset(seg->data + seg_size - pad, 0, pad);

	rmpp_mad->rmpp_hdr.rmpp_version = send_wr->mad_agent_priv->
					  agent.rmpp_version;
	rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_DATA;
	ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);

	send_wr->cur_seg = container_of(send_wr->rmpp_list.next,
					struct ib_rmpp_segment, list);
	send_wr->last_ack_seg = send_wr->cur_seg;
	return 0;
991 992
}

993
int ib_mad_kernel_rmpp_agent(const struct ib_mad_agent *agent)
I
Ira Weiny 已提交
994 995 996 997 998
{
	return agent->rmpp_version && !(agent->flags & IB_MAD_USER_RMPP);
}
EXPORT_SYMBOL(ib_mad_kernel_rmpp_agent);

999 1000
struct ib_mad_send_buf * ib_create_send_mad(struct ib_mad_agent *mad_agent,
					    u32 remote_qpn, u16 pkey_index,
1001
					    int rmpp_active,
1002
					    int hdr_len, int data_len,
1003 1004
					    gfp_t gfp_mask,
					    u8 base_version)
1005 1006
{
	struct ib_mad_agent_private *mad_agent_priv;
1007
	struct ib_mad_send_wr_private *mad_send_wr;
1008
	int pad, message_size, ret, size;
1009
	void *buf;
1010 1011
	size_t mad_size;
	bool opa;
1012

1013 1014
	mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
				      agent);
1015 1016 1017 1018 1019 1020 1021 1022 1023

	opa = rdma_cap_opa_mad(mad_agent->device, mad_agent->port_num);

	if (opa && base_version == OPA_MGMT_BASE_VERSION)
		mad_size = sizeof(struct opa_mad);
	else
		mad_size = sizeof(struct ib_mad);

	pad = get_pad_size(hdr_len, data_len, mad_size);
1024
	message_size = hdr_len + data_len + pad;
1025

I
Ira Weiny 已提交
1026
	if (ib_mad_kernel_rmpp_agent(mad_agent)) {
1027
		if (!rmpp_active && message_size > mad_size)
I
Ira Weiny 已提交
1028 1029
			return ERR_PTR(-EINVAL);
	} else
1030
		if (rmpp_active || message_size > mad_size)
I
Ira Weiny 已提交
1031
			return ERR_PTR(-EINVAL);
1032

1033
	size = rmpp_active ? hdr_len : mad_size;
1034
	buf = kzalloc(sizeof *mad_send_wr + size, gfp_mask);
1035 1036
	if (!buf)
		return ERR_PTR(-ENOMEM);
1037

1038 1039
	mad_send_wr = buf + size;
	INIT_LIST_HEAD(&mad_send_wr->rmpp_list);
1040
	mad_send_wr->send_buf.mad = buf;
1041 1042 1043
	mad_send_wr->send_buf.hdr_len = hdr_len;
	mad_send_wr->send_buf.data_len = data_len;
	mad_send_wr->pad = pad;
1044 1045

	mad_send_wr->mad_agent_priv = mad_agent_priv;
1046
	mad_send_wr->sg_list[0].length = hdr_len;
1047
	mad_send_wr->sg_list[0].lkey = mad_agent->qp->pd->local_dma_lkey;
1048 1049 1050 1051 1052 1053 1054 1055

	/* OPA MADs don't have to be the full 2048 bytes */
	if (opa && base_version == OPA_MGMT_BASE_VERSION &&
	    data_len < mad_size - hdr_len)
		mad_send_wr->sg_list[1].length = data_len;
	else
		mad_send_wr->sg_list[1].length = mad_size - hdr_len;

1056
	mad_send_wr->sg_list[1].lkey = mad_agent->qp->pd->local_dma_lkey;
1057

C
Christoph Hellwig 已提交
1058 1059 1060
	mad_send_wr->mad_list.cqe.done = ib_mad_send_done;

	mad_send_wr->send_wr.wr.wr_cqe = &mad_send_wr->mad_list.cqe;
C
Christoph Hellwig 已提交
1061 1062 1063 1064 1065 1066 1067
	mad_send_wr->send_wr.wr.sg_list = mad_send_wr->sg_list;
	mad_send_wr->send_wr.wr.num_sge = 2;
	mad_send_wr->send_wr.wr.opcode = IB_WR_SEND;
	mad_send_wr->send_wr.wr.send_flags = IB_SEND_SIGNALED;
	mad_send_wr->send_wr.remote_qpn = remote_qpn;
	mad_send_wr->send_wr.remote_qkey = IB_QP_SET_QKEY;
	mad_send_wr->send_wr.pkey_index = pkey_index;
1068 1069

	if (rmpp_active) {
1070
		ret = alloc_send_rmpp_list(mad_send_wr, mad_size, gfp_mask);
1071 1072 1073 1074
		if (ret) {
			kfree(buf);
			return ERR_PTR(ret);
		}
1075 1076
	}

1077
	mad_send_wr->send_buf.mad_agent = mad_agent;
1078
	atomic_inc(&mad_agent_priv->refcount);
1079
	return &mad_send_wr->send_buf;
1080 1081 1082
}
EXPORT_SYMBOL(ib_create_send_mad);

1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111
int ib_get_mad_data_offset(u8 mgmt_class)
{
	if (mgmt_class == IB_MGMT_CLASS_SUBN_ADM)
		return IB_MGMT_SA_HDR;
	else if ((mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
		 (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
		 (mgmt_class == IB_MGMT_CLASS_BIS))
		return IB_MGMT_DEVICE_HDR;
	else if ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
		 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END))
		return IB_MGMT_VENDOR_HDR;
	else
		return IB_MGMT_MAD_HDR;
}
EXPORT_SYMBOL(ib_get_mad_data_offset);

int ib_is_mad_class_rmpp(u8 mgmt_class)
{
	if ((mgmt_class == IB_MGMT_CLASS_SUBN_ADM) ||
	    (mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
	    (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
	    (mgmt_class == IB_MGMT_CLASS_BIS) ||
	    ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
	     (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END)))
		return 1;
	return 0;
}
EXPORT_SYMBOL(ib_is_mad_class_rmpp);

1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143
void *ib_get_rmpp_segment(struct ib_mad_send_buf *send_buf, int seg_num)
{
	struct ib_mad_send_wr_private *mad_send_wr;
	struct list_head *list;

	mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
				   send_buf);
	list = &mad_send_wr->cur_seg->list;

	if (mad_send_wr->cur_seg->num < seg_num) {
		list_for_each_entry(mad_send_wr->cur_seg, list, list)
			if (mad_send_wr->cur_seg->num == seg_num)
				break;
	} else if (mad_send_wr->cur_seg->num > seg_num) {
		list_for_each_entry_reverse(mad_send_wr->cur_seg, list, list)
			if (mad_send_wr->cur_seg->num == seg_num)
				break;
	}
	return mad_send_wr->cur_seg->data;
}
EXPORT_SYMBOL(ib_get_rmpp_segment);

static inline void *ib_get_payload(struct ib_mad_send_wr_private *mad_send_wr)
{
	if (mad_send_wr->send_buf.seg_count)
		return ib_get_rmpp_segment(&mad_send_wr->send_buf,
					   mad_send_wr->seg_num);
	else
		return mad_send_wr->send_buf.mad +
		       mad_send_wr->send_buf.hdr_len;
}

1144 1145 1146
void ib_free_send_mad(struct ib_mad_send_buf *send_buf)
{
	struct ib_mad_agent_private *mad_agent_priv;
1147
	struct ib_mad_send_wr_private *mad_send_wr;
1148 1149 1150

	mad_agent_priv = container_of(send_buf->mad_agent,
				      struct ib_mad_agent_private, agent);
1151 1152
	mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
				   send_buf);
1153

1154 1155
	free_send_rmpp_list(mad_send_wr);
	kfree(send_buf->mad);
S
Sean Hefty 已提交
1156
	deref_mad_agent(mad_agent_priv);
1157 1158 1159
}
EXPORT_SYMBOL(ib_free_send_mad);

1160
int ib_send_mad(struct ib_mad_send_wr_private *mad_send_wr)
L
Linus Torvalds 已提交
1161 1162
{
	struct ib_mad_qp_info *qp_info;
1163
	struct list_head *list;
1164 1165 1166
	struct ib_send_wr *bad_send_wr;
	struct ib_mad_agent *mad_agent;
	struct ib_sge *sge;
L
Linus Torvalds 已提交
1167 1168 1169
	unsigned long flags;
	int ret;

1170
	/* Set WR ID to find mad_send_wr upon completion */
1171
	qp_info = mad_send_wr->mad_agent_priv->qp_info;
L
Linus Torvalds 已提交
1172
	mad_send_wr->mad_list.mad_queue = &qp_info->send_queue;
C
Christoph Hellwig 已提交
1173 1174
	mad_send_wr->mad_list.cqe.done = ib_mad_send_done;
	mad_send_wr->send_wr.wr.wr_cqe = &mad_send_wr->mad_list.cqe;
L
Linus Torvalds 已提交
1175

1176 1177
	mad_agent = mad_send_wr->send_buf.mad_agent;
	sge = mad_send_wr->sg_list;
1178 1179 1180 1181
	sge[0].addr = ib_dma_map_single(mad_agent->device,
					mad_send_wr->send_buf.mad,
					sge[0].length,
					DMA_TO_DEVICE);
1182 1183 1184
	if (unlikely(ib_dma_mapping_error(mad_agent->device, sge[0].addr)))
		return -ENOMEM;

1185 1186 1187 1188 1189 1190
	mad_send_wr->header_mapping = sge[0].addr;

	sge[1].addr = ib_dma_map_single(mad_agent->device,
					ib_get_payload(mad_send_wr),
					sge[1].length,
					DMA_TO_DEVICE);
1191 1192 1193 1194 1195 1196
	if (unlikely(ib_dma_mapping_error(mad_agent->device, sge[1].addr))) {
		ib_dma_unmap_single(mad_agent->device,
				    mad_send_wr->header_mapping,
				    sge[0].length, DMA_TO_DEVICE);
		return -ENOMEM;
	}
1197
	mad_send_wr->payload_mapping = sge[1].addr;
1198

L
Linus Torvalds 已提交
1199
	spin_lock_irqsave(&qp_info->send_queue.lock, flags);
1200
	if (qp_info->send_queue.count < qp_info->send_queue.max_active) {
C
Christoph Hellwig 已提交
1201
		ret = ib_post_send(mad_agent->qp, &mad_send_wr->send_wr.wr,
1202
				   &bad_send_wr);
1203
		list = &qp_info->send_queue.list;
L
Linus Torvalds 已提交
1204 1205
	} else {
		ret = 0;
1206
		list = &qp_info->overflow_list;
L
Linus Torvalds 已提交
1207
	}
1208 1209 1210 1211 1212 1213

	if (!ret) {
		qp_info->send_queue.count++;
		list_add_tail(&mad_send_wr->mad_list.list, list);
	}
	spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
1214
	if (ret) {
1215 1216 1217 1218 1219 1220
		ib_dma_unmap_single(mad_agent->device,
				    mad_send_wr->header_mapping,
				    sge[0].length, DMA_TO_DEVICE);
		ib_dma_unmap_single(mad_agent->device,
				    mad_send_wr->payload_mapping,
				    sge[1].length, DMA_TO_DEVICE);
1221
	}
L
Linus Torvalds 已提交
1222 1223 1224 1225 1226 1227 1228
	return ret;
}

/*
 * ib_post_send_mad - Posts MAD(s) to the send queue of the QP associated
 *  with the registered client
 */
1229 1230
int ib_post_send_mad(struct ib_mad_send_buf *send_buf,
		     struct ib_mad_send_buf **bad_send_buf)
L
Linus Torvalds 已提交
1231 1232
{
	struct ib_mad_agent_private *mad_agent_priv;
1233 1234 1235 1236
	struct ib_mad_send_buf *next_send_buf;
	struct ib_mad_send_wr_private *mad_send_wr;
	unsigned long flags;
	int ret = -EINVAL;
L
Linus Torvalds 已提交
1237 1238

	/* Walk list of send WRs and post each on send list */
1239 1240 1241 1242 1243
	for (; send_buf; send_buf = next_send_buf) {
		mad_send_wr = container_of(send_buf,
					   struct ib_mad_send_wr_private,
					   send_buf);
		mad_agent_priv = mad_send_wr->mad_agent_priv;
L
Linus Torvalds 已提交
1244

1245 1246 1247 1248 1249
		ret = ib_mad_enforce_security(mad_agent_priv,
					      mad_send_wr->send_wr.pkey_index);
		if (ret)
			goto error;

1250 1251 1252 1253 1254
		if (!send_buf->mad_agent->send_handler ||
		    (send_buf->timeout_ms &&
		     !send_buf->mad_agent->recv_handler)) {
			ret = -EINVAL;
			goto error;
L
Linus Torvalds 已提交
1255 1256
		}

1257 1258 1259 1260 1261 1262 1263
		if (!ib_is_mad_class_rmpp(((struct ib_mad_hdr *) send_buf->mad)->mgmt_class)) {
			if (mad_agent_priv->agent.rmpp_version) {
				ret = -EINVAL;
				goto error;
			}
		}

L
Linus Torvalds 已提交
1264 1265 1266 1267 1268
		/*
		 * Save pointer to next work request to post in case the
		 * current one completes, and the user modifies the work
		 * request associated with the completion
		 */
1269
		next_send_buf = send_buf->next;
C
Christoph Hellwig 已提交
1270
		mad_send_wr->send_wr.ah = send_buf->ah;
L
Linus Torvalds 已提交
1271

1272 1273 1274 1275
		if (((struct ib_mad_hdr *) send_buf->mad)->mgmt_class ==
		    IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
			ret = handle_outgoing_dr_smp(mad_agent_priv,
						     mad_send_wr);
L
Linus Torvalds 已提交
1276
			if (ret < 0)		/* error */
1277
				goto error;
L
Linus Torvalds 已提交
1278
			else if (ret == 1)	/* locally consumed */
1279
				continue;
L
Linus Torvalds 已提交
1280 1281
		}

1282
		mad_send_wr->tid = ((struct ib_mad_hdr *) send_buf->mad)->tid;
L
Linus Torvalds 已提交
1283
		/* Timeout will be updated after send completes */
1284
		mad_send_wr->timeout = msecs_to_jiffies(send_buf->timeout_ms);
1285 1286 1287
		mad_send_wr->max_retries = send_buf->retries;
		mad_send_wr->retries_left = send_buf->retries;
		send_buf->retries = 0;
1288
		/* Reference for work request to QP + response */
L
Linus Torvalds 已提交
1289 1290 1291 1292 1293 1294 1295 1296 1297 1298
		mad_send_wr->refcount = 1 + (mad_send_wr->timeout > 0);
		mad_send_wr->status = IB_WC_SUCCESS;

		/* Reference MAD agent until send completes */
		atomic_inc(&mad_agent_priv->refcount);
		spin_lock_irqsave(&mad_agent_priv->lock, flags);
		list_add_tail(&mad_send_wr->agent_list,
			      &mad_agent_priv->send_list);
		spin_unlock_irqrestore(&mad_agent_priv->lock, flags);

I
Ira Weiny 已提交
1299
		if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) {
1300 1301 1302 1303 1304 1305
			ret = ib_send_rmpp_mad(mad_send_wr);
			if (ret >= 0 && ret != IB_RMPP_RESULT_CONSUMED)
				ret = ib_send_mad(mad_send_wr);
		} else
			ret = ib_send_mad(mad_send_wr);
		if (ret < 0) {
L
Linus Torvalds 已提交
1306 1307 1308 1309 1310
			/* Fail send request */
			spin_lock_irqsave(&mad_agent_priv->lock, flags);
			list_del(&mad_send_wr->agent_list);
			spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
			atomic_dec(&mad_agent_priv->refcount);
1311
			goto error;
L
Linus Torvalds 已提交
1312 1313 1314
		}
	}
	return 0;
1315 1316 1317
error:
	if (bad_send_buf)
		*bad_send_buf = send_buf;
L
Linus Torvalds 已提交
1318 1319 1320 1321 1322 1323 1324 1325 1326 1327
	return ret;
}
EXPORT_SYMBOL(ib_post_send_mad);

/*
 * ib_free_recv_mad - Returns data buffers used to receive
 *  a MAD to the access layer
 */
void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc)
{
1328
	struct ib_mad_recv_buf *mad_recv_buf, *temp_recv_buf;
L
Linus Torvalds 已提交
1329 1330
	struct ib_mad_private_header *mad_priv_hdr;
	struct ib_mad_private *priv;
1331
	struct list_head free_list;
L
Linus Torvalds 已提交
1332

1333 1334
	INIT_LIST_HEAD(&free_list);
	list_splice_init(&mad_recv_wc->rmpp_list, &free_list);
L
Linus Torvalds 已提交
1335

1336 1337 1338 1339
	list_for_each_entry_safe(mad_recv_buf, temp_recv_buf,
					&free_list, list) {
		mad_recv_wc = container_of(mad_recv_buf, struct ib_mad_recv_wc,
					   recv_buf);
L
Linus Torvalds 已提交
1340 1341 1342 1343 1344
		mad_priv_hdr = container_of(mad_recv_wc,
					    struct ib_mad_private_header,
					    recv_wc);
		priv = container_of(mad_priv_hdr, struct ib_mad_private,
				    header);
1345
		kfree(priv);
L
Linus Torvalds 已提交
1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362
	}
}
EXPORT_SYMBOL(ib_free_recv_mad);

struct ib_mad_agent *ib_redirect_mad_qp(struct ib_qp *qp,
					u8 rmpp_version,
					ib_mad_send_handler send_handler,
					ib_mad_recv_handler recv_handler,
					void *context)
{
	return ERR_PTR(-EINVAL);	/* XXX: for now */
}
EXPORT_SYMBOL(ib_redirect_mad_qp);

int ib_process_mad_wc(struct ib_mad_agent *mad_agent,
		      struct ib_wc *wc)
{
1363 1364
	dev_err(&mad_agent->device->dev,
		"ib_process_mad_wc() not implemented yet\n");
L
Linus Torvalds 已提交
1365 1366 1367 1368 1369 1370 1371 1372 1373
	return 0;
}
EXPORT_SYMBOL(ib_process_mad_wc);

static int method_in_use(struct ib_mad_mgmt_method_table **method,
			 struct ib_mad_reg_req *mad_reg_req)
{
	int i;

1374
	for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS) {
L
Linus Torvalds 已提交
1375
		if ((*method)->agent[i]) {
1376
			pr_err("Method %d already in use\n", i);
L
Linus Torvalds 已提交
1377 1378 1379 1380 1381 1382 1383 1384 1385
			return -EINVAL;
		}
	}
	return 0;
}

static int allocate_method_table(struct ib_mad_mgmt_method_table **method)
{
	/* Allocate management method table */
R
Roland Dreier 已提交
1386
	*method = kzalloc(sizeof **method, GFP_ATOMIC);
1387
	return (*method) ? 0 : (-ENOMEM);
L
Linus Torvalds 已提交
1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426
}

/*
 * Check to see if there are any methods still in use
 */
static int check_method_table(struct ib_mad_mgmt_method_table *method)
{
	int i;

	for (i = 0; i < IB_MGMT_MAX_METHODS; i++)
		if (method->agent[i])
			return 1;
	return 0;
}

/*
 * Check to see if there are any method tables for this class still in use
 */
static int check_class_table(struct ib_mad_mgmt_class_table *class)
{
	int i;

	for (i = 0; i < MAX_MGMT_CLASS; i++)
		if (class->method_table[i])
			return 1;
	return 0;
}

static int check_vendor_class(struct ib_mad_mgmt_vendor_class *vendor_class)
{
	int i;

	for (i = 0; i < MAX_MGMT_OUI; i++)
		if (vendor_class->method_table[i])
			return 1;
	return 0;
}

static int find_vendor_oui(struct ib_mad_mgmt_vendor_class *vendor_class,
1427
			   const char *oui)
L
Linus Torvalds 已提交
1428 1429 1430 1431
{
	int i;

	for (i = 0; i < MAX_MGMT_OUI; i++)
R
Roland Dreier 已提交
1432 1433
		/* Is there matching OUI for this vendor class ? */
		if (!memcmp(vendor_class->oui[i], oui, 3))
L
Linus Torvalds 已提交
1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475
			return i;

	return -1;
}

static int check_vendor_table(struct ib_mad_mgmt_vendor_class_table *vendor)
{
	int i;

	for (i = 0; i < MAX_MGMT_VENDOR_RANGE2; i++)
		if (vendor->vendor_class[i])
			return 1;

	return 0;
}

static void remove_methods_mad_agent(struct ib_mad_mgmt_method_table *method,
				     struct ib_mad_agent_private *agent)
{
	int i;

	/* Remove any methods for this mad agent */
	for (i = 0; i < IB_MGMT_MAX_METHODS; i++) {
		if (method->agent[i] == agent) {
			method->agent[i] = NULL;
		}
	}
}

static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
			      struct ib_mad_agent_private *agent_priv,
			      u8 mgmt_class)
{
	struct ib_mad_port_private *port_priv;
	struct ib_mad_mgmt_class_table **class;
	struct ib_mad_mgmt_method_table **method;
	int i, ret;

	port_priv = agent_priv->qp_info->port_priv;
	class = &port_priv->version[mad_reg_req->mgmt_class_version].class;
	if (!*class) {
		/* Allocate management class table for "new" class version */
R
Roland Dreier 已提交
1476
		*class = kzalloc(sizeof **class, GFP_ATOMIC);
L
Linus Torvalds 已提交
1477 1478 1479 1480
		if (!*class) {
			ret = -ENOMEM;
			goto error1;
		}
R
Roland Dreier 已提交
1481

L
Linus Torvalds 已提交
1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499
		/* Allocate method table for this management class */
		method = &(*class)->method_table[mgmt_class];
		if ((ret = allocate_method_table(method)))
			goto error2;
	} else {
		method = &(*class)->method_table[mgmt_class];
		if (!*method) {
			/* Allocate method table for this management class */
			if ((ret = allocate_method_table(method)))
				goto error1;
		}
	}

	/* Now, make sure methods are not already in use */
	if (method_in_use(method, mad_reg_req))
		goto error3;

	/* Finally, add in methods being registered */
1500
	for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS)
L
Linus Torvalds 已提交
1501
		(*method)->agent[i] = agent_priv;
1502

L
Linus Torvalds 已提交
1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540
	return 0;

error3:
	/* Remove any methods for this mad agent */
	remove_methods_mad_agent(*method, agent_priv);
	/* Now, check to see if there are any methods in use */
	if (!check_method_table(*method)) {
		/* If not, release management method table */
		kfree(*method);
		*method = NULL;
	}
	ret = -EINVAL;
	goto error1;
error2:
	kfree(*class);
	*class = NULL;
error1:
	return ret;
}

static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
			   struct ib_mad_agent_private *agent_priv)
{
	struct ib_mad_port_private *port_priv;
	struct ib_mad_mgmt_vendor_class_table **vendor_table;
	struct ib_mad_mgmt_vendor_class_table *vendor = NULL;
	struct ib_mad_mgmt_vendor_class *vendor_class = NULL;
	struct ib_mad_mgmt_method_table **method;
	int i, ret = -ENOMEM;
	u8 vclass;

	/* "New" vendor (with OUI) class */
	vclass = vendor_class_index(mad_reg_req->mgmt_class);
	port_priv = agent_priv->qp_info->port_priv;
	vendor_table = &port_priv->version[
				mad_reg_req->mgmt_class_version].vendor;
	if (!*vendor_table) {
		/* Allocate mgmt vendor class table for "new" class version */
R
Roland Dreier 已提交
1541
		vendor = kzalloc(sizeof *vendor, GFP_ATOMIC);
1542
		if (!vendor)
L
Linus Torvalds 已提交
1543
			goto error1;
R
Roland Dreier 已提交
1544

L
Linus Torvalds 已提交
1545 1546 1547 1548
		*vendor_table = vendor;
	}
	if (!(*vendor_table)->vendor_class[vclass]) {
		/* Allocate table for this management vendor class */
R
Roland Dreier 已提交
1549
		vendor_class = kzalloc(sizeof *vendor_class, GFP_ATOMIC);
1550
		if (!vendor_class)
L
Linus Torvalds 已提交
1551
			goto error2;
R
Roland Dreier 已提交
1552

L
Linus Torvalds 已提交
1553 1554 1555 1556 1557 1558 1559 1560
		(*vendor_table)->vendor_class[vclass] = vendor_class;
	}
	for (i = 0; i < MAX_MGMT_OUI; i++) {
		/* Is there matching OUI for this vendor class ? */
		if (!memcmp((*vendor_table)->vendor_class[vclass]->oui[i],
			    mad_reg_req->oui, 3)) {
			method = &(*vendor_table)->vendor_class[
						vclass]->method_table[i];
1561 1562
			if (!*method)
				goto error3;
L
Linus Torvalds 已提交
1563 1564 1565 1566 1567 1568 1569 1570 1571 1572
			goto check_in_use;
		}
	}
	for (i = 0; i < MAX_MGMT_OUI; i++) {
		/* OUI slot available ? */
		if (!is_vendor_oui((*vendor_table)->vendor_class[
				vclass]->oui[i])) {
			method = &(*vendor_table)->vendor_class[
				vclass]->method_table[i];
			/* Allocate method table for this OUI */
1573 1574 1575 1576 1577
			if (!*method) {
				ret = allocate_method_table(method);
				if (ret)
					goto error3;
			}
L
Linus Torvalds 已提交
1578 1579 1580 1581 1582
			memcpy((*vendor_table)->vendor_class[vclass]->oui[i],
			       mad_reg_req->oui, 3);
			goto check_in_use;
		}
	}
1583
	dev_err(&agent_priv->agent.device->dev, "All OUI slots in use\n");
L
Linus Torvalds 已提交
1584 1585 1586 1587 1588 1589 1590 1591
	goto error3;

check_in_use:
	/* Now, make sure methods are not already in use */
	if (method_in_use(method, mad_reg_req))
		goto error4;

	/* Finally, add in methods being registered */
1592
	for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS)
L
Linus Torvalds 已提交
1593
		(*method)->agent[i] = agent_priv;
1594

L
Linus Torvalds 已提交
1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652
	return 0;

error4:
	/* Remove any methods for this mad agent */
	remove_methods_mad_agent(*method, agent_priv);
	/* Now, check to see if there are any methods in use */
	if (!check_method_table(*method)) {
		/* If not, release management method table */
		kfree(*method);
		*method = NULL;
	}
	ret = -EINVAL;
error3:
	if (vendor_class) {
		(*vendor_table)->vendor_class[vclass] = NULL;
		kfree(vendor_class);
	}
error2:
	if (vendor) {
		*vendor_table = NULL;
		kfree(vendor);
	}
error1:
	return ret;
}

static void remove_mad_reg_req(struct ib_mad_agent_private *agent_priv)
{
	struct ib_mad_port_private *port_priv;
	struct ib_mad_mgmt_class_table *class;
	struct ib_mad_mgmt_method_table *method;
	struct ib_mad_mgmt_vendor_class_table *vendor;
	struct ib_mad_mgmt_vendor_class *vendor_class;
	int index;
	u8 mgmt_class;

	/*
	 * Was MAD registration request supplied
	 * with original registration ?
	 */
	if (!agent_priv->reg_req) {
		goto out;
	}

	port_priv = agent_priv->qp_info->port_priv;
	mgmt_class = convert_mgmt_class(agent_priv->reg_req->mgmt_class);
	class = port_priv->version[
			agent_priv->reg_req->mgmt_class_version].class;
	if (!class)
		goto vendor_check;

	method = class->method_table[mgmt_class];
	if (method) {
		/* Remove any methods for this mad agent */
		remove_methods_mad_agent(method, agent_priv);
		/* Now, check to see if there are any methods still in use */
		if (!check_method_table(method)) {
			/* If not, release management method table */
B
Bart Van Assche 已提交
1653 1654 1655
			kfree(method);
			class->method_table[mgmt_class] = NULL;
			/* Any management classes left ? */
L
Linus Torvalds 已提交
1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719
			if (!check_class_table(class)) {
				/* If not, release management class table */
				kfree(class);
				port_priv->version[
					agent_priv->reg_req->
					mgmt_class_version].class = NULL;
			}
		}
	}

vendor_check:
	if (!is_vendor_class(mgmt_class))
		goto out;

	/* normalize mgmt_class to vendor range 2 */
	mgmt_class = vendor_class_index(agent_priv->reg_req->mgmt_class);
	vendor = port_priv->version[
			agent_priv->reg_req->mgmt_class_version].vendor;

	if (!vendor)
		goto out;

	vendor_class = vendor->vendor_class[mgmt_class];
	if (vendor_class) {
		index = find_vendor_oui(vendor_class, agent_priv->reg_req->oui);
		if (index < 0)
			goto out;
		method = vendor_class->method_table[index];
		if (method) {
			/* Remove any methods for this mad agent */
			remove_methods_mad_agent(method, agent_priv);
			/*
			 * Now, check to see if there are
			 * any methods still in use
			 */
			if (!check_method_table(method)) {
				/* If not, release management method table */
				kfree(method);
				vendor_class->method_table[index] = NULL;
				memset(vendor_class->oui[index], 0, 3);
				/* Any OUIs left ? */
				if (!check_vendor_class(vendor_class)) {
					/* If not, release vendor class table */
					kfree(vendor_class);
					vendor->vendor_class[mgmt_class] = NULL;
					/* Any other vendor classes left ? */
					if (!check_vendor_table(vendor)) {
						kfree(vendor);
						port_priv->version[
							agent_priv->reg_req->
							mgmt_class_version].
							vendor = NULL;
					}
				}
			}
		}
	}

out:
	return;
}

static struct ib_mad_agent_private *
find_mad_agent(struct ib_mad_port_private *port_priv,
1720
	       const struct ib_mad_hdr *mad_hdr)
L
Linus Torvalds 已提交
1721 1722 1723 1724 1725
{
	struct ib_mad_agent_private *mad_agent = NULL;
	unsigned long flags;

	spin_lock_irqsave(&port_priv->reg_lock, flags);
1726
	if (ib_response_mad(mad_hdr)) {
L
Linus Torvalds 已提交
1727 1728 1729 1730 1731 1732 1733
		u32 hi_tid;
		struct ib_mad_agent_private *entry;

		/*
		 * Routing is based on high 32 bits of transaction ID
		 * of MAD.
		 */
1734
		hi_tid = be64_to_cpu(mad_hdr->tid) >> 32;
1735
		list_for_each_entry(entry, &port_priv->agent_list, agent_list) {
L
Linus Torvalds 已提交
1736 1737 1738 1739 1740 1741 1742 1743 1744 1745
			if (entry->agent.hi_tid == hi_tid) {
				mad_agent = entry;
				break;
			}
		}
	} else {
		struct ib_mad_mgmt_class_table *class;
		struct ib_mad_mgmt_method_table *method;
		struct ib_mad_mgmt_vendor_class_table *vendor;
		struct ib_mad_mgmt_vendor_class *vendor_class;
1746
		const struct ib_vendor_mad *vendor_mad;
L
Linus Torvalds 已提交
1747 1748 1749 1750 1751 1752
		int index;

		/*
		 * Routing is based on version, class, and method
		 * For "newer" vendor MADs, also based on OUI
		 */
1753
		if (mad_hdr->class_version >= MAX_MGMT_VERSION)
L
Linus Torvalds 已提交
1754
			goto out;
1755
		if (!is_vendor_class(mad_hdr->mgmt_class)) {
L
Linus Torvalds 已提交
1756
			class = port_priv->version[
1757
					mad_hdr->class_version].class;
L
Linus Torvalds 已提交
1758 1759
			if (!class)
				goto out;
1760
			if (convert_mgmt_class(mad_hdr->mgmt_class) >=
B
Bart Van Assche 已提交
1761
			    ARRAY_SIZE(class->method_table))
1762
				goto out;
L
Linus Torvalds 已提交
1763
			method = class->method_table[convert_mgmt_class(
1764
							mad_hdr->mgmt_class)];
L
Linus Torvalds 已提交
1765
			if (method)
1766
				mad_agent = method->agent[mad_hdr->method &
L
Linus Torvalds 已提交
1767 1768 1769
							  ~IB_MGMT_METHOD_RESP];
		} else {
			vendor = port_priv->version[
1770
					mad_hdr->class_version].vendor;
L
Linus Torvalds 已提交
1771 1772 1773
			if (!vendor)
				goto out;
			vendor_class = vendor->vendor_class[vendor_class_index(
1774
						mad_hdr->mgmt_class)];
L
Linus Torvalds 已提交
1775 1776 1777
			if (!vendor_class)
				goto out;
			/* Find matching OUI */
1778
			vendor_mad = (const struct ib_vendor_mad *)mad_hdr;
L
Linus Torvalds 已提交
1779 1780 1781 1782 1783
			index = find_vendor_oui(vendor_class, vendor_mad->oui);
			if (index == -1)
				goto out;
			method = vendor_class->method_table[index];
			if (method) {
1784
				mad_agent = method->agent[mad_hdr->method &
L
Linus Torvalds 已提交
1785 1786 1787 1788 1789 1790 1791 1792 1793
							  ~IB_MGMT_METHOD_RESP];
			}
		}
	}

	if (mad_agent) {
		if (mad_agent->agent.recv_handler)
			atomic_inc(&mad_agent->refcount);
		else {
1794 1795 1796
			dev_notice(&port_priv->device->dev,
				   "No receive handler for client %p on port %d\n",
				   &mad_agent->agent, port_priv->port_num);
L
Linus Torvalds 已提交
1797 1798 1799 1800 1801 1802 1803 1804 1805
			mad_agent = NULL;
		}
	}
out:
	spin_unlock_irqrestore(&port_priv->reg_lock, flags);

	return mad_agent;
}

I
Ira Weiny 已提交
1806 1807 1808
static int validate_mad(const struct ib_mad_hdr *mad_hdr,
			const struct ib_mad_qp_info *qp_info,
			bool opa)
L
Linus Torvalds 已提交
1809 1810
{
	int valid = 0;
I
Ira Weiny 已提交
1811
	u32 qp_num = qp_info->qp->qp_num;
L
Linus Torvalds 已提交
1812 1813

	/* Make sure MAD base version is understood */
I
Ira Weiny 已提交
1814 1815 1816 1817
	if (mad_hdr->base_version != IB_MGMT_BASE_VERSION &&
	    (!opa || mad_hdr->base_version != OPA_MGMT_BASE_VERSION)) {
		pr_err("MAD received with unsupported base version %d %s\n",
		       mad_hdr->base_version, opa ? "(opa)" : "");
L
Linus Torvalds 已提交
1818 1819 1820 1821
		goto out;
	}

	/* Filter SMI packets sent to other than QP0 */
1822 1823
	if ((mad_hdr->mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
	    (mad_hdr->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
L
Linus Torvalds 已提交
1824 1825 1826
		if (qp_num == 0)
			valid = 1;
	} else {
1827 1828 1829 1830 1831
		/* CM attributes other than ClassPortInfo only use Send method */
		if ((mad_hdr->mgmt_class == IB_MGMT_CLASS_CM) &&
		    (mad_hdr->attr_id != IB_MGMT_CLASSPORTINFO_ATTR_ID) &&
		    (mad_hdr->method != IB_MGMT_METHOD_SEND))
			goto out;
L
Linus Torvalds 已提交
1832 1833 1834 1835 1836 1837 1838 1839 1840
		/* Filter GSI packets sent to QP0 */
		if (qp_num != 0)
			valid = 1;
	}

out:
	return valid;
}

1841 1842
static int is_rmpp_data_mad(const struct ib_mad_agent_private *mad_agent_priv,
			    const struct ib_mad_hdr *mad_hdr)
1843 1844 1845 1846 1847
{
	struct ib_rmpp_mad *rmpp_mad;

	rmpp_mad = (struct ib_rmpp_mad *)mad_hdr;
	return !mad_agent_priv->agent.rmpp_version ||
I
Ira Weiny 已提交
1848
		!ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent) ||
1849 1850 1851 1852 1853
		!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
				    IB_MGMT_RMPP_FLAG_ACTIVE) ||
		(rmpp_mad->rmpp_hdr.rmpp_type == IB_MGMT_RMPP_TYPE_DATA);
}

I
Ira Weiny 已提交
1854 1855
static inline int rcv_has_same_class(const struct ib_mad_send_wr_private *wr,
				     const struct ib_mad_recv_wc *rwc)
1856
{
I
Ira Weiny 已提交
1857
	return ((struct ib_mad_hdr *)(wr->send_buf.mad))->mgmt_class ==
1858 1859 1860
		rwc->recv_buf.mad->mad_hdr.mgmt_class;
}

1861 1862 1863
static inline int rcv_has_same_gid(const struct ib_mad_agent_private *mad_agent_priv,
				   const struct ib_mad_send_wr_private *wr,
				   const struct ib_mad_recv_wc *rwc )
1864
{
1865
	struct rdma_ah_attr attr;
1866
	u8 send_resp, rcv_resp;
1867 1868 1869 1870
	union ib_gid sgid;
	struct ib_device *device = mad_agent_priv->agent.device;
	u8 port_num = mad_agent_priv->agent.port_num;
	u8 lmc;
1871
	bool has_grh;
1872

1873 1874
	send_resp = ib_response_mad((struct ib_mad_hdr *)wr->send_buf.mad);
	rcv_resp = ib_response_mad(&rwc->recv_buf.mad->mad_hdr);
1875 1876 1877 1878 1879

	if (send_resp == rcv_resp)
		/* both requests, or both responses. GIDs different */
		return 0;

1880
	if (rdma_query_ah(wr->send_buf.ah, &attr))
1881 1882 1883
		/* Assume not equal, to avoid false positives. */
		return 0;

1884 1885
	has_grh = !!(rdma_ah_get_ah_flags(&attr) & IB_AH_GRH);
	if (has_grh != !!(rwc->wc->wc_flags & IB_WC_GRH))
1886 1887
		/* one has GID, other does not.  Assume different */
		return 0;
1888 1889 1890

	if (!send_resp && rcv_resp) {
		/* is request/response. */
1891
		if (!has_grh) {
1892 1893
			if (ib_get_cached_lmc(device, port_num, &lmc))
				return 0;
1894
			return (!lmc || !((rdma_ah_get_path_bits(&attr) ^
1895 1896 1897
					   rwc->wc->dlid_path_bits) &
					  ((1 << lmc) - 1)));
		} else {
1898 1899 1900
			const struct ib_global_route *grh =
					rdma_ah_read_grh(&attr);

1901 1902
			if (rdma_query_gid(device, port_num,
					   grh->sgid_index, &sgid))
1903 1904 1905 1906 1907 1908
				return 0;
			return !memcmp(sgid.raw, rwc->recv_buf.grh->dgid.raw,
				       16);
		}
	}

1909 1910
	if (!has_grh)
		return rdma_ah_get_dlid(&attr) == rwc->wc->slid;
1911
	else
1912 1913
		return !memcmp(rdma_ah_read_grh(&attr)->dgid.raw,
			       rwc->recv_buf.grh->sgid.raw,
1914 1915 1916 1917 1918 1919
			       16);
}

static inline int is_direct(u8 class)
{
	return (class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE);
1920
}
1921

1922
struct ib_mad_send_wr_private*
1923 1924
ib_find_send_mad(const struct ib_mad_agent_private *mad_agent_priv,
		 const struct ib_mad_recv_wc *wc)
L
Linus Torvalds 已提交
1925
{
1926
	struct ib_mad_send_wr_private *wr;
1927
	const struct ib_mad_hdr *mad_hdr;
1928

1929
	mad_hdr = &wc->recv_buf.mad->mad_hdr;
1930 1931

	list_for_each_entry(wr, &mad_agent_priv->wait_list, agent_list) {
1932
		if ((wr->tid == mad_hdr->tid) &&
1933 1934 1935 1936 1937
		    rcv_has_same_class(wr, wc) &&
		    /*
		     * Don't check GID for direct routed MADs.
		     * These might have permissive LIDs.
		     */
1938
		    (is_direct(mad_hdr->mgmt_class) ||
1939
		     rcv_has_same_gid(mad_agent_priv, wr, wc)))
1940
			return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
L
Linus Torvalds 已提交
1941 1942 1943 1944 1945 1946
	}

	/*
	 * It's possible to receive the response before we've
	 * been notified that the send has completed
	 */
1947
	list_for_each_entry(wr, &mad_agent_priv->send_list, agent_list) {
1948
		if (is_rmpp_data_mad(mad_agent_priv, wr->send_buf.mad) &&
1949
		    wr->tid == mad_hdr->tid &&
1950 1951 1952 1953 1954 1955
		    wr->timeout &&
		    rcv_has_same_class(wr, wc) &&
		    /*
		     * Don't check GID for direct routed MADs.
		     * These might have permissive LIDs.
		     */
1956
		    (is_direct(mad_hdr->mgmt_class) ||
1957
		     rcv_has_same_gid(mad_agent_priv, wr, wc)))
L
Linus Torvalds 已提交
1958
			/* Verify request has not been canceled */
1959
			return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
L
Linus Torvalds 已提交
1960 1961 1962 1963
	}
	return NULL;
}

1964
void ib_mark_mad_done(struct ib_mad_send_wr_private *mad_send_wr)
1965 1966
{
	mad_send_wr->timeout = 0;
A
Akinobu Mita 已提交
1967 1968
	if (mad_send_wr->refcount == 1)
		list_move_tail(&mad_send_wr->agent_list,
1969 1970 1971
			      &mad_send_wr->mad_agent_priv->done_list);
}

L
Linus Torvalds 已提交
1972
static void ib_mad_complete_recv(struct ib_mad_agent_private *mad_agent_priv,
1973
				 struct ib_mad_recv_wc *mad_recv_wc)
L
Linus Torvalds 已提交
1974 1975 1976 1977
{
	struct ib_mad_send_wr_private *mad_send_wr;
	struct ib_mad_send_wc mad_send_wc;
	unsigned long flags;
1978 1979
	int ret;

1980
	INIT_LIST_HEAD(&mad_recv_wc->rmpp_list);
1981 1982 1983 1984 1985
	ret = ib_mad_enforce_security(mad_agent_priv,
				      mad_recv_wc->wc->pkey_index);
	if (ret) {
		ib_free_recv_mad(mad_recv_wc);
		deref_mad_agent(mad_agent_priv);
1986
		return;
1987
	}
L
Linus Torvalds 已提交
1988

1989
	list_add(&mad_recv_wc->recv_buf.list, &mad_recv_wc->rmpp_list);
I
Ira Weiny 已提交
1990
	if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) {
1991 1992 1993
		mad_recv_wc = ib_process_rmpp_recv_wc(mad_agent_priv,
						      mad_recv_wc);
		if (!mad_recv_wc) {
S
Sean Hefty 已提交
1994
			deref_mad_agent(mad_agent_priv);
1995 1996 1997 1998
			return;
		}
	}

L
Linus Torvalds 已提交
1999
	/* Complete corresponding request */
2000
	if (ib_response_mad(&mad_recv_wc->recv_buf.mad->mad_hdr)) {
L
Linus Torvalds 已提交
2001
		spin_lock_irqsave(&mad_agent_priv->lock, flags);
2002
		mad_send_wr = ib_find_send_mad(mad_agent_priv, mad_recv_wc);
L
Linus Torvalds 已提交
2003 2004
		if (!mad_send_wr) {
			spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
I
Ira Weiny 已提交
2005 2006 2007 2008 2009 2010 2011
			if (!ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)
			   && ib_is_mad_class_rmpp(mad_recv_wc->recv_buf.mad->mad_hdr.mgmt_class)
			   && (ib_get_rmpp_flags(&((struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad)->rmpp_hdr)
					& IB_MGMT_RMPP_FLAG_ACTIVE)) {
				/* user rmpp is in effect
				 * and this is an active RMPP MAD
				 */
2012 2013 2014
				mad_agent_priv->agent.recv_handler(
						&mad_agent_priv->agent, NULL,
						mad_recv_wc);
I
Ira Weiny 已提交
2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025
				atomic_dec(&mad_agent_priv->refcount);
			} else {
				/* not user rmpp, revert to normal behavior and
				 * drop the mad */
				ib_free_recv_mad(mad_recv_wc);
				deref_mad_agent(mad_agent_priv);
				return;
			}
		} else {
			ib_mark_mad_done(mad_send_wr);
			spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
L
Linus Torvalds 已提交
2026

I
Ira Weiny 已提交
2027
			/* Defined behavior is to complete response before request */
2028 2029 2030 2031
			mad_agent_priv->agent.recv_handler(
					&mad_agent_priv->agent,
					&mad_send_wr->send_buf,
					mad_recv_wc);
I
Ira Weiny 已提交
2032
			atomic_dec(&mad_agent_priv->refcount);
L
Linus Torvalds 已提交
2033

I
Ira Weiny 已提交
2034 2035 2036 2037 2038
			mad_send_wc.status = IB_WC_SUCCESS;
			mad_send_wc.vendor_err = 0;
			mad_send_wc.send_buf = &mad_send_wr->send_buf;
			ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
		}
L
Linus Torvalds 已提交
2039
	} else {
2040
		mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent, NULL,
2041
						   mad_recv_wc);
S
Sean Hefty 已提交
2042
		deref_mad_agent(mad_agent_priv);
L
Linus Torvalds 已提交
2043
	}
2044 2045

	return;
L
Linus Torvalds 已提交
2046 2047
}

2048 2049 2050 2051 2052 2053 2054 2055
static enum smi_action handle_ib_smi(const struct ib_mad_port_private *port_priv,
				     const struct ib_mad_qp_info *qp_info,
				     const struct ib_wc *wc,
				     int port_num,
				     struct ib_mad_private *recv,
				     struct ib_mad_private *response)
{
	enum smi_forward_action retsmi;
2056
	struct ib_smp *smp = (struct ib_smp *)recv->mad;
2057

2058
	if (smi_handle_dr_smp_recv(smp,
2059
				   rdma_cap_ib_switch(port_priv->device),
2060 2061 2062 2063 2064
				   port_num,
				   port_priv->device->phys_port_cnt) ==
				   IB_SMI_DISCARD)
		return IB_SMI_DISCARD;

2065
	retsmi = smi_check_forward_dr_smp(smp);
2066 2067 2068 2069
	if (retsmi == IB_SMI_LOCAL)
		return IB_SMI_HANDLE;

	if (retsmi == IB_SMI_SEND) { /* don't forward */
2070
		if (smi_handle_dr_smp_send(smp,
2071
					   rdma_cap_ib_switch(port_priv->device),
2072 2073 2074
					   port_num) == IB_SMI_DISCARD)
			return IB_SMI_DISCARD;

2075
		if (smi_check_local_smp(smp, port_priv->device) == IB_SMI_DISCARD)
2076
			return IB_SMI_DISCARD;
2077
	} else if (rdma_cap_ib_switch(port_priv->device)) {
2078
		/* forward case for switches */
2079
		memcpy(response, recv, mad_priv_size(response));
2080
		response->header.recv_wc.wc = &response->header.wc;
2081
		response->header.recv_wc.recv_buf.mad = (struct ib_mad *)response->mad;
2082 2083
		response->header.recv_wc.recv_buf.grh = &response->grh;

2084
		agent_send_response((const struct ib_mad_hdr *)response->mad,
2085 2086
				    &response->grh, wc,
				    port_priv->device,
2087 2088
				    smi_get_fwd_port(smp),
				    qp_info->qp->qp_num,
I
Ira Weiny 已提交
2089 2090
				    response->mad_size,
				    false);
2091 2092 2093 2094 2095 2096

		return IB_SMI_DISCARD;
	}
	return IB_SMI_HANDLE;
}

2097
static bool generate_unmatched_resp(const struct ib_mad_private *recv,
I
Ira Weiny 已提交
2098 2099
				    struct ib_mad_private *response,
				    size_t *resp_len, bool opa)
2100
{
2101 2102 2103 2104 2105 2106
	const struct ib_mad_hdr *recv_hdr = (const struct ib_mad_hdr *)recv->mad;
	struct ib_mad_hdr *resp_hdr = (struct ib_mad_hdr *)response->mad;

	if (recv_hdr->method == IB_MGMT_METHOD_GET ||
	    recv_hdr->method == IB_MGMT_METHOD_SET) {
		memcpy(response, recv, mad_priv_size(response));
2107
		response->header.recv_wc.wc = &response->header.wc;
2108
		response->header.recv_wc.recv_buf.mad = (struct ib_mad *)response->mad;
2109
		response->header.recv_wc.recv_buf.grh = &response->grh;
2110 2111 2112 2113
		resp_hdr->method = IB_MGMT_METHOD_GET_RESP;
		resp_hdr->status = cpu_to_be16(IB_MGMT_MAD_STATUS_UNSUPPORTED_METHOD_ATTRIB);
		if (recv_hdr->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
			resp_hdr->status |= IB_SMP_DIRECTION;
2114

I
Ira Weiny 已提交
2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125
		if (opa && recv_hdr->base_version == OPA_MGMT_BASE_VERSION) {
			if (recv_hdr->mgmt_class ==
			    IB_MGMT_CLASS_SUBN_LID_ROUTED ||
			    recv_hdr->mgmt_class ==
			    IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
				*resp_len = opa_get_smp_header_size(
							(struct opa_smp *)recv->mad);
			else
				*resp_len = sizeof(struct ib_mad_hdr);
		}

2126 2127 2128 2129 2130
		return true;
	} else {
		return false;
	}
}
I
Ira Weiny 已提交
2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143

static enum smi_action
handle_opa_smi(struct ib_mad_port_private *port_priv,
	       struct ib_mad_qp_info *qp_info,
	       struct ib_wc *wc,
	       int port_num,
	       struct ib_mad_private *recv,
	       struct ib_mad_private *response)
{
	enum smi_forward_action retsmi;
	struct opa_smp *smp = (struct opa_smp *)recv->mad;

	if (opa_smi_handle_dr_smp_recv(smp,
2144
				   rdma_cap_ib_switch(port_priv->device),
I
Ira Weiny 已提交
2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155
				   port_num,
				   port_priv->device->phys_port_cnt) ==
				   IB_SMI_DISCARD)
		return IB_SMI_DISCARD;

	retsmi = opa_smi_check_forward_dr_smp(smp);
	if (retsmi == IB_SMI_LOCAL)
		return IB_SMI_HANDLE;

	if (retsmi == IB_SMI_SEND) { /* don't forward */
		if (opa_smi_handle_dr_smp_send(smp,
2156
					   rdma_cap_ib_switch(port_priv->device),
I
Ira Weiny 已提交
2157 2158 2159 2160 2161 2162 2163
					   port_num) == IB_SMI_DISCARD)
			return IB_SMI_DISCARD;

		if (opa_smi_check_local_smp(smp, port_priv->device) ==
		    IB_SMI_DISCARD)
			return IB_SMI_DISCARD;

2164
	} else if (rdma_cap_ib_switch(port_priv->device)) {
I
Ira Weiny 已提交
2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197
		/* forward case for switches */
		memcpy(response, recv, mad_priv_size(response));
		response->header.recv_wc.wc = &response->header.wc;
		response->header.recv_wc.recv_buf.opa_mad =
				(struct opa_mad *)response->mad;
		response->header.recv_wc.recv_buf.grh = &response->grh;

		agent_send_response((const struct ib_mad_hdr *)response->mad,
				    &response->grh, wc,
				    port_priv->device,
				    opa_smi_get_fwd_port(smp),
				    qp_info->qp->qp_num,
				    recv->header.wc.byte_len,
				    true);

		return IB_SMI_DISCARD;
	}

	return IB_SMI_HANDLE;
}

static enum smi_action
handle_smi(struct ib_mad_port_private *port_priv,
	   struct ib_mad_qp_info *qp_info,
	   struct ib_wc *wc,
	   int port_num,
	   struct ib_mad_private *recv,
	   struct ib_mad_private *response,
	   bool opa)
{
	struct ib_mad_hdr *mad_hdr = (struct ib_mad_hdr *)recv->mad;

	if (opa && mad_hdr->base_version == OPA_MGMT_BASE_VERSION &&
2198
	    mad_hdr->class_version == OPA_SM_CLASS_VERSION)
I
Ira Weiny 已提交
2199 2200 2201 2202 2203 2204
		return handle_opa_smi(port_priv, qp_info, wc, port_num, recv,
				      response);

	return handle_ib_smi(port_priv, qp_info, wc, port_num, recv, response);
}

C
Christoph Hellwig 已提交
2205
static void ib_mad_recv_done(struct ib_cq *cq, struct ib_wc *wc)
L
Linus Torvalds 已提交
2206
{
C
Christoph Hellwig 已提交
2207 2208 2209
	struct ib_mad_port_private *port_priv = cq->cq_context;
	struct ib_mad_list_head *mad_list =
		container_of(wc->wr_cqe, struct ib_mad_list_head, cqe);
L
Linus Torvalds 已提交
2210 2211
	struct ib_mad_qp_info *qp_info;
	struct ib_mad_private_header *mad_priv_hdr;
2212
	struct ib_mad_private *recv, *response = NULL;
L
Linus Torvalds 已提交
2213
	struct ib_mad_agent_private *mad_agent;
2214
	int port_num;
2215
	int ret = IB_MAD_RESULT_SUCCESS;
2216 2217
	size_t mad_size;
	u16 resp_mad_pkey_index = 0;
I
Ira Weiny 已提交
2218
	bool opa;
L
Linus Torvalds 已提交
2219

C
Christoph Hellwig 已提交
2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230
	if (list_empty_careful(&port_priv->port_list))
		return;

	if (wc->status != IB_WC_SUCCESS) {
		/*
		 * Receive errors indicate that the QP has entered the error
		 * state - error handling/shutdown code will cleanup
		 */
		return;
	}

L
Linus Torvalds 已提交
2231 2232 2233
	qp_info = mad_list->mad_queue->qp_info;
	dequeue_mad(mad_list);

I
Ira Weiny 已提交
2234 2235 2236
	opa = rdma_cap_opa_mad(qp_info->port_priv->device,
			       qp_info->port_priv->port_num);

L
Linus Torvalds 已提交
2237 2238 2239
	mad_priv_hdr = container_of(mad_list, struct ib_mad_private_header,
				    mad_list);
	recv = container_of(mad_priv_hdr, struct ib_mad_private, header);
2240 2241
	ib_dma_unmap_single(port_priv->device,
			    recv->header.mapping,
2242
			    mad_priv_dma_size(recv),
2243
			    DMA_FROM_DEVICE);
L
Linus Torvalds 已提交
2244 2245

	/* Setup MAD receive work completion from "normal" work completion */
2246 2247
	recv->header.wc = *wc;
	recv->header.recv_wc.wc = &recv->header.wc;
I
Ira Weiny 已提交
2248 2249 2250 2251 2252 2253 2254 2255 2256

	if (opa && ((struct ib_mad_hdr *)(recv->mad))->base_version == OPA_MGMT_BASE_VERSION) {
		recv->header.recv_wc.mad_len = wc->byte_len - sizeof(struct ib_grh);
		recv->header.recv_wc.mad_seg_size = sizeof(struct opa_mad);
	} else {
		recv->header.recv_wc.mad_len = sizeof(struct ib_mad);
		recv->header.recv_wc.mad_seg_size = sizeof(struct ib_mad);
	}

2257
	recv->header.recv_wc.recv_buf.mad = (struct ib_mad *)recv->mad;
L
Linus Torvalds 已提交
2258 2259 2260 2261 2262 2263
	recv->header.recv_wc.recv_buf.grh = &recv->grh;

	if (atomic_read(&qp_info->snoop_count))
		snoop_recv(qp_info, &recv->header.recv_wc, IB_MAD_SNOOP_RECVS);

	/* Validate MAD */
I
Ira Weiny 已提交
2264
	if (!validate_mad((const struct ib_mad_hdr *)recv->mad, qp_info, opa))
L
Linus Torvalds 已提交
2265 2266
		goto out;

2267 2268
	mad_size = recv->mad_size;
	response = alloc_mad_private(mad_size, GFP_KERNEL);
2269
	if (!response)
2270 2271
		goto out;

2272
	if (rdma_cap_ib_switch(port_priv->device))
2273 2274 2275 2276
		port_num = wc->port_num;
	else
		port_num = port_priv->port_num;

2277
	if (((struct ib_mad_hdr *)recv->mad)->mgmt_class ==
L
Linus Torvalds 已提交
2278
	    IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
I
Ira Weiny 已提交
2279 2280
		if (handle_smi(port_priv, qp_info, wc, port_num, recv,
			       response, opa)
2281
		    == IB_SMI_DISCARD)
L
Linus Torvalds 已提交
2282 2283 2284 2285 2286 2287 2288 2289
			goto out;
	}

	/* Give driver "right of first refusal" on incoming MAD */
	if (port_priv->device->process_mad) {
		ret = port_priv->device->process_mad(port_priv->device, 0,
						     port_priv->port_num,
						     wc, &recv->grh,
2290 2291 2292 2293
						     (const struct ib_mad_hdr *)recv->mad,
						     recv->mad_size,
						     (struct ib_mad_hdr *)response->mad,
						     &mad_size, &resp_mad_pkey_index);
I
Ira Weiny 已提交
2294 2295 2296 2297

		if (opa)
			wc->pkey_index = resp_mad_pkey_index;

L
Linus Torvalds 已提交
2298 2299 2300 2301
		if (ret & IB_MAD_RESULT_SUCCESS) {
			if (ret & IB_MAD_RESULT_CONSUMED)
				goto out;
			if (ret & IB_MAD_RESULT_REPLY) {
2302
				agent_send_response((const struct ib_mad_hdr *)response->mad,
2303 2304
						    &recv->grh, wc,
						    port_priv->device,
2305
						    port_num,
2306
						    qp_info->qp->qp_num,
I
Ira Weiny 已提交
2307
						    mad_size, opa);
L
Linus Torvalds 已提交
2308 2309 2310 2311 2312
				goto out;
			}
		}
	}

2313
	mad_agent = find_mad_agent(port_priv, (const struct ib_mad_hdr *)recv->mad);
L
Linus Torvalds 已提交
2314
	if (mad_agent) {
2315
		ib_mad_complete_recv(mad_agent, &recv->header.recv_wc);
L
Linus Torvalds 已提交
2316 2317 2318 2319 2320
		/*
		 * recv is freed up in error cases in ib_mad_complete_recv
		 * or via recv_handler in ib_mad_complete_recv()
		 */
		recv = NULL;
2321
	} else if ((ret & IB_MAD_RESULT_SUCCESS) &&
I
Ira Weiny 已提交
2322
		   generate_unmatched_resp(recv, response, &mad_size, opa)) {
2323 2324
		agent_send_response((const struct ib_mad_hdr *)response->mad, &recv->grh, wc,
				    port_priv->device, port_num,
I
Ira Weiny 已提交
2325
				    qp_info->qp->qp_num, mad_size, opa);
L
Linus Torvalds 已提交
2326 2327 2328 2329 2330 2331
	}

out:
	/* Post another receive request for this QP */
	if (response) {
		ib_mad_post_receive_mads(qp_info, response);
2332
		kfree(recv);
L
Linus Torvalds 已提交
2333 2334 2335 2336 2337 2338 2339 2340 2341 2342
	} else
		ib_mad_post_receive_mads(qp_info, recv);
}

static void adjust_timeout(struct ib_mad_agent_private *mad_agent_priv)
{
	struct ib_mad_send_wr_private *mad_send_wr;
	unsigned long delay;

	if (list_empty(&mad_agent_priv->wait_list)) {
2343
		cancel_delayed_work(&mad_agent_priv->timed_work);
L
Linus Torvalds 已提交
2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354
	} else {
		mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
					 struct ib_mad_send_wr_private,
					 agent_list);

		if (time_after(mad_agent_priv->timeout,
			       mad_send_wr->timeout)) {
			mad_agent_priv->timeout = mad_send_wr->timeout;
			delay = mad_send_wr->timeout - jiffies;
			if ((long)delay <= 0)
				delay = 1;
2355 2356
			mod_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
					 &mad_agent_priv->timed_work, delay);
L
Linus Torvalds 已提交
2357 2358 2359 2360
		}
	}
}

2361
static void wait_for_response(struct ib_mad_send_wr_private *mad_send_wr)
L
Linus Torvalds 已提交
2362
{
2363
	struct ib_mad_agent_private *mad_agent_priv;
L
Linus Torvalds 已提交
2364 2365 2366 2367
	struct ib_mad_send_wr_private *temp_mad_send_wr;
	struct list_head *list_item;
	unsigned long delay;

2368
	mad_agent_priv = mad_send_wr->mad_agent_priv;
L
Linus Torvalds 已提交
2369 2370 2371 2372 2373
	list_del(&mad_send_wr->agent_list);

	delay = mad_send_wr->timeout;
	mad_send_wr->timeout += jiffies;

2374 2375 2376 2377 2378 2379 2380 2381 2382
	if (delay) {
		list_for_each_prev(list_item, &mad_agent_priv->wait_list) {
			temp_mad_send_wr = list_entry(list_item,
						struct ib_mad_send_wr_private,
						agent_list);
			if (time_after(mad_send_wr->timeout,
				       temp_mad_send_wr->timeout))
				break;
		}
L
Linus Torvalds 已提交
2383
	}
2384 2385
	else
		list_item = &mad_agent_priv->wait_list;
L
Linus Torvalds 已提交
2386 2387 2388
	list_add(&mad_send_wr->agent_list, list_item);

	/* Reschedule a work item if we have a shorter timeout */
2389 2390 2391
	if (mad_agent_priv->wait_list.next == &mad_send_wr->agent_list)
		mod_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
				 &mad_agent_priv->timed_work, delay);
L
Linus Torvalds 已提交
2392 2393
}

2394 2395 2396 2397 2398 2399 2400
void ib_reset_mad_timeout(struct ib_mad_send_wr_private *mad_send_wr,
			  int timeout_ms)
{
	mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
	wait_for_response(mad_send_wr);
}

L
Linus Torvalds 已提交
2401 2402 2403
/*
 * Process a send work completion
 */
2404 2405
void ib_mad_complete_send_wr(struct ib_mad_send_wr_private *mad_send_wr,
			     struct ib_mad_send_wc *mad_send_wc)
L
Linus Torvalds 已提交
2406 2407 2408
{
	struct ib_mad_agent_private	*mad_agent_priv;
	unsigned long			flags;
2409
	int				ret;
L
Linus Torvalds 已提交
2410

2411
	mad_agent_priv = mad_send_wr->mad_agent_priv;
L
Linus Torvalds 已提交
2412
	spin_lock_irqsave(&mad_agent_priv->lock, flags);
I
Ira Weiny 已提交
2413
	if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) {
2414 2415 2416 2417 2418 2419
		ret = ib_process_rmpp_send_wc(mad_send_wr, mad_send_wc);
		if (ret == IB_RMPP_RESULT_CONSUMED)
			goto done;
	} else
		ret = IB_RMPP_RESULT_UNHANDLED;

L
Linus Torvalds 已提交
2420 2421 2422 2423 2424 2425 2426 2427 2428
	if (mad_send_wc->status != IB_WC_SUCCESS &&
	    mad_send_wr->status == IB_WC_SUCCESS) {
		mad_send_wr->status = mad_send_wc->status;
		mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
	}

	if (--mad_send_wr->refcount > 0) {
		if (mad_send_wr->refcount == 1 && mad_send_wr->timeout &&
		    mad_send_wr->status == IB_WC_SUCCESS) {
2429
			wait_for_response(mad_send_wr);
L
Linus Torvalds 已提交
2430
		}
2431
		goto done;
L
Linus Torvalds 已提交
2432 2433 2434 2435 2436 2437 2438 2439 2440
	}

	/* Remove send from MAD agent and notify client of completion */
	list_del(&mad_send_wr->agent_list);
	adjust_timeout(mad_agent_priv);
	spin_unlock_irqrestore(&mad_agent_priv->lock, flags);

	if (mad_send_wr->status != IB_WC_SUCCESS )
		mad_send_wc->status = mad_send_wr->status;
2441 2442 2443
	if (ret == IB_RMPP_RESULT_INTERNAL)
		ib_rmpp_send_handler(mad_send_wc);
	else
2444 2445
		mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
						   mad_send_wc);
L
Linus Torvalds 已提交
2446 2447

	/* Release reference on agent taken when sending */
S
Sean Hefty 已提交
2448
	deref_mad_agent(mad_agent_priv);
2449 2450 2451
	return;
done:
	spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
L
Linus Torvalds 已提交
2452 2453
}

C
Christoph Hellwig 已提交
2454
static void ib_mad_send_done(struct ib_cq *cq, struct ib_wc *wc)
L
Linus Torvalds 已提交
2455
{
C
Christoph Hellwig 已提交
2456 2457 2458
	struct ib_mad_port_private *port_priv = cq->cq_context;
	struct ib_mad_list_head *mad_list =
		container_of(wc->wr_cqe, struct ib_mad_list_head, cqe);
L
Linus Torvalds 已提交
2459 2460 2461 2462
	struct ib_mad_send_wr_private	*mad_send_wr, *queued_send_wr;
	struct ib_mad_qp_info		*qp_info;
	struct ib_mad_queue		*send_queue;
	struct ib_send_wr		*bad_send_wr;
2463
	struct ib_mad_send_wc		mad_send_wc;
L
Linus Torvalds 已提交
2464 2465 2466
	unsigned long flags;
	int ret;

C
Christoph Hellwig 已提交
2467 2468 2469 2470 2471 2472 2473 2474
	if (list_empty_careful(&port_priv->port_list))
		return;

	if (wc->status != IB_WC_SUCCESS) {
		if (!ib_mad_send_error(port_priv, wc))
			return;
	}

L
Linus Torvalds 已提交
2475 2476 2477 2478 2479 2480
	mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
				   mad_list);
	send_queue = mad_list->mad_queue;
	qp_info = send_queue->qp_info;

retry:
2481 2482 2483 2484 2485 2486
	ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
			    mad_send_wr->header_mapping,
			    mad_send_wr->sg_list[0].length, DMA_TO_DEVICE);
	ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
			    mad_send_wr->payload_mapping,
			    mad_send_wr->sg_list[1].length, DMA_TO_DEVICE);
L
Linus Torvalds 已提交
2487 2488 2489 2490 2491 2492 2493 2494 2495 2496 2497
	queued_send_wr = NULL;
	spin_lock_irqsave(&send_queue->lock, flags);
	list_del(&mad_list->list);

	/* Move queued send to the send queue */
	if (send_queue->count-- > send_queue->max_active) {
		mad_list = container_of(qp_info->overflow_list.next,
					struct ib_mad_list_head, list);
		queued_send_wr = container_of(mad_list,
					struct ib_mad_send_wr_private,
					mad_list);
A
Akinobu Mita 已提交
2498
		list_move_tail(&mad_list->list, &send_queue->list);
L
Linus Torvalds 已提交
2499 2500 2501
	}
	spin_unlock_irqrestore(&send_queue->lock, flags);

2502 2503 2504
	mad_send_wc.send_buf = &mad_send_wr->send_buf;
	mad_send_wc.status = wc->status;
	mad_send_wc.vendor_err = wc->vendor_err;
L
Linus Torvalds 已提交
2505
	if (atomic_read(&qp_info->snoop_count))
2506
		snoop_send(qp_info, &mad_send_wr->send_buf, &mad_send_wc,
L
Linus Torvalds 已提交
2507
			   IB_MAD_SNOOP_SEND_COMPLETIONS);
2508
	ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
L
Linus Torvalds 已提交
2509 2510

	if (queued_send_wr) {
C
Christoph Hellwig 已提交
2511
		ret = ib_post_send(qp_info->qp, &queued_send_wr->send_wr.wr,
2512
				   &bad_send_wr);
L
Linus Torvalds 已提交
2513
		if (ret) {
2514 2515
			dev_err(&port_priv->device->dev,
				"ib_post_send failed: %d\n", ret);
L
Linus Torvalds 已提交
2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538
			mad_send_wr = queued_send_wr;
			wc->status = IB_WC_LOC_QP_OP_ERR;
			goto retry;
		}
	}
}

static void mark_sends_for_retry(struct ib_mad_qp_info *qp_info)
{
	struct ib_mad_send_wr_private *mad_send_wr;
	struct ib_mad_list_head *mad_list;
	unsigned long flags;

	spin_lock_irqsave(&qp_info->send_queue.lock, flags);
	list_for_each_entry(mad_list, &qp_info->send_queue.list, list) {
		mad_send_wr = container_of(mad_list,
					   struct ib_mad_send_wr_private,
					   mad_list);
		mad_send_wr->retry = 1;
	}
	spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
}

C
Christoph Hellwig 已提交
2539 2540
static bool ib_mad_send_error(struct ib_mad_port_private *port_priv,
		struct ib_wc *wc)
L
Linus Torvalds 已提交
2541
{
C
Christoph Hellwig 已提交
2542 2543 2544
	struct ib_mad_list_head *mad_list =
		container_of(wc->wr_cqe, struct ib_mad_list_head, cqe);
	struct ib_mad_qp_info *qp_info = mad_list->mad_queue->qp_info;
L
Linus Torvalds 已提交
2545 2546 2547 2548 2549 2550 2551 2552 2553 2554 2555 2556 2557 2558 2559
	struct ib_mad_send_wr_private *mad_send_wr;
	int ret;

	/*
	 * Send errors will transition the QP to SQE - move
	 * QP to RTS and repost flushed work requests
	 */
	mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
				   mad_list);
	if (wc->status == IB_WC_WR_FLUSH_ERR) {
		if (mad_send_wr->retry) {
			/* Repost send */
			struct ib_send_wr *bad_send_wr;

			mad_send_wr->retry = 0;
C
Christoph Hellwig 已提交
2560
			ret = ib_post_send(qp_info->qp, &mad_send_wr->send_wr.wr,
L
Linus Torvalds 已提交
2561
					&bad_send_wr);
C
Christoph Hellwig 已提交
2562 2563 2564
			if (!ret)
				return false;
		}
L
Linus Torvalds 已提交
2565 2566 2567 2568 2569 2570 2571 2572 2573 2574 2575 2576
	} else {
		struct ib_qp_attr *attr;

		/* Transition QP to RTS and fail offending send */
		attr = kmalloc(sizeof *attr, GFP_KERNEL);
		if (attr) {
			attr->qp_state = IB_QPS_RTS;
			attr->cur_qp_state = IB_QPS_SQE;
			ret = ib_modify_qp(qp_info->qp, attr,
					   IB_QP_STATE | IB_QP_CUR_STATE);
			kfree(attr);
			if (ret)
2577
				dev_err(&port_priv->device->dev,
C
Christoph Hellwig 已提交
2578 2579
					"%s - ib_modify_qp to RTS: %d\n",
					__func__, ret);
L
Linus Torvalds 已提交
2580 2581 2582 2583 2584
			else
				mark_sends_for_retry(qp_info);
		}
	}

C
Christoph Hellwig 已提交
2585
	return true;
L
Linus Torvalds 已提交
2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600
}

static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv)
{
	unsigned long flags;
	struct ib_mad_send_wr_private *mad_send_wr, *temp_mad_send_wr;
	struct ib_mad_send_wc mad_send_wc;
	struct list_head cancel_list;

	INIT_LIST_HEAD(&cancel_list);

	spin_lock_irqsave(&mad_agent_priv->lock, flags);
	list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
				 &mad_agent_priv->send_list, agent_list) {
		if (mad_send_wr->status == IB_WC_SUCCESS) {
R
Roland Dreier 已提交
2601
			mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
L
Linus Torvalds 已提交
2602 2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615
			mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
		}
	}

	/* Empty wait list to prevent receives from finding a request */
	list_splice_init(&mad_agent_priv->wait_list, &cancel_list);
	spin_unlock_irqrestore(&mad_agent_priv->lock, flags);

	/* Report all cancelled requests */
	mad_send_wc.status = IB_WC_WR_FLUSH_ERR;
	mad_send_wc.vendor_err = 0;

	list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
				 &cancel_list, agent_list) {
2616 2617
		mad_send_wc.send_buf = &mad_send_wr->send_buf;
		list_del(&mad_send_wr->agent_list);
L
Linus Torvalds 已提交
2618 2619 2620 2621 2622 2623 2624
		mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
						   &mad_send_wc);
		atomic_dec(&mad_agent_priv->refcount);
	}
}

static struct ib_mad_send_wr_private*
2625 2626
find_send_wr(struct ib_mad_agent_private *mad_agent_priv,
	     struct ib_mad_send_buf *send_buf)
L
Linus Torvalds 已提交
2627 2628 2629 2630 2631
{
	struct ib_mad_send_wr_private *mad_send_wr;

	list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list,
			    agent_list) {
2632
		if (&mad_send_wr->send_buf == send_buf)
L
Linus Torvalds 已提交
2633 2634 2635 2636 2637
			return mad_send_wr;
	}

	list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list,
			    agent_list) {
2638 2639
		if (is_rmpp_data_mad(mad_agent_priv,
				     mad_send_wr->send_buf.mad) &&
2640
		    &mad_send_wr->send_buf == send_buf)
L
Linus Torvalds 已提交
2641 2642 2643 2644 2645
			return mad_send_wr;
	}
	return NULL;
}

2646 2647
int ib_modify_mad(struct ib_mad_agent *mad_agent,
		  struct ib_mad_send_buf *send_buf, u32 timeout_ms)
L
Linus Torvalds 已提交
2648 2649 2650 2651
{
	struct ib_mad_agent_private *mad_agent_priv;
	struct ib_mad_send_wr_private *mad_send_wr;
	unsigned long flags;
2652
	int active;
L
Linus Torvalds 已提交
2653 2654 2655 2656

	mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
				      agent);
	spin_lock_irqsave(&mad_agent_priv->lock, flags);
2657
	mad_send_wr = find_send_wr(mad_agent_priv, send_buf);
2658
	if (!mad_send_wr || mad_send_wr->status != IB_WC_SUCCESS) {
L
Linus Torvalds 已提交
2659
		spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2660
		return -EINVAL;
L
Linus Torvalds 已提交
2661 2662
	}

2663
	active = (!mad_send_wr->timeout || mad_send_wr->refcount > 1);
2664
	if (!timeout_ms) {
L
Linus Torvalds 已提交
2665
		mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2666
		mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
L
Linus Torvalds 已提交
2667 2668
	}

2669
	mad_send_wr->send_buf.timeout_ms = timeout_ms;
2670
	if (active)
2671 2672 2673 2674
		mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
	else
		ib_reset_mad_timeout(mad_send_wr, timeout_ms);

L
Linus Torvalds 已提交
2675
	spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2676 2677 2678
	return 0;
}
EXPORT_SYMBOL(ib_modify_mad);
L
Linus Torvalds 已提交
2679

2680 2681
void ib_cancel_mad(struct ib_mad_agent *mad_agent,
		   struct ib_mad_send_buf *send_buf)
2682
{
2683
	ib_modify_mad(mad_agent, send_buf, 0);
L
Linus Torvalds 已提交
2684 2685 2686
}
EXPORT_SYMBOL(ib_cancel_mad);

D
David Howells 已提交
2687
static void local_completions(struct work_struct *work)
L
Linus Torvalds 已提交
2688 2689 2690 2691 2692
{
	struct ib_mad_agent_private *mad_agent_priv;
	struct ib_mad_local_private *local;
	struct ib_mad_agent_private *recv_mad_agent;
	unsigned long flags;
2693
	int free_mad;
L
Linus Torvalds 已提交
2694 2695
	struct ib_wc wc;
	struct ib_mad_send_wc mad_send_wc;
I
Ira Weiny 已提交
2696
	bool opa;
L
Linus Torvalds 已提交
2697

D
David Howells 已提交
2698 2699
	mad_agent_priv =
		container_of(work, struct ib_mad_agent_private, local_work);
L
Linus Torvalds 已提交
2700

I
Ira Weiny 已提交
2701 2702 2703
	opa = rdma_cap_opa_mad(mad_agent_priv->qp_info->port_priv->device,
			       mad_agent_priv->qp_info->port_priv->port_num);

L
Linus Torvalds 已提交
2704 2705 2706 2707 2708
	spin_lock_irqsave(&mad_agent_priv->lock, flags);
	while (!list_empty(&mad_agent_priv->local_list)) {
		local = list_entry(mad_agent_priv->local_list.next,
				   struct ib_mad_local_private,
				   completion_list);
2709
		list_del(&local->completion_list);
L
Linus Torvalds 已提交
2710
		spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2711
		free_mad = 0;
L
Linus Torvalds 已提交
2712
		if (local->mad_priv) {
I
Ira Weiny 已提交
2713
			u8 base_version;
L
Linus Torvalds 已提交
2714 2715
			recv_mad_agent = local->recv_mad_agent;
			if (!recv_mad_agent) {
2716 2717
				dev_err(&mad_agent_priv->agent.device->dev,
					"No receive MAD agent for local completion\n");
2718
				free_mad = 1;
L
Linus Torvalds 已提交
2719 2720 2721 2722 2723 2724 2725
				goto local_send_completion;
			}

			/*
			 * Defined behavior is to complete response
			 * before request
			 */
2726
			build_smp_wc(recv_mad_agent->agent.qp,
C
Christoph Hellwig 已提交
2727
				     local->mad_send_wr->send_wr.wr.wr_cqe,
2728
				     be16_to_cpu(IB_LID_PERMISSIVE),
C
Christoph Hellwig 已提交
2729
				     local->mad_send_wr->send_wr.pkey_index,
I
Ira Weiny 已提交
2730
				     recv_mad_agent->agent.port_num, &wc);
L
Linus Torvalds 已提交
2731 2732

			local->mad_priv->header.recv_wc.wc = &wc;
I
Ira Weiny 已提交
2733 2734 2735 2736 2737 2738 2739 2740 2741 2742

			base_version = ((struct ib_mad_hdr *)(local->mad_priv->mad))->base_version;
			if (opa && base_version == OPA_MGMT_BASE_VERSION) {
				local->mad_priv->header.recv_wc.mad_len = local->return_wc_byte_len;
				local->mad_priv->header.recv_wc.mad_seg_size = sizeof(struct opa_mad);
			} else {
				local->mad_priv->header.recv_wc.mad_len = sizeof(struct ib_mad);
				local->mad_priv->header.recv_wc.mad_seg_size = sizeof(struct ib_mad);
			}

2743 2744 2745
			INIT_LIST_HEAD(&local->mad_priv->header.recv_wc.rmpp_list);
			list_add(&local->mad_priv->header.recv_wc.recv_buf.list,
				 &local->mad_priv->header.recv_wc.rmpp_list);
L
Linus Torvalds 已提交
2746 2747
			local->mad_priv->header.recv_wc.recv_buf.grh = NULL;
			local->mad_priv->header.recv_wc.recv_buf.mad =
2748
						(struct ib_mad *)local->mad_priv->mad;
L
Linus Torvalds 已提交
2749 2750 2751 2752 2753 2754
			if (atomic_read(&recv_mad_agent->qp_info->snoop_count))
				snoop_recv(recv_mad_agent->qp_info,
					  &local->mad_priv->header.recv_wc,
					   IB_MAD_SNOOP_RECVS);
			recv_mad_agent->agent.recv_handler(
						&recv_mad_agent->agent,
2755
						&local->mad_send_wr->send_buf,
L
Linus Torvalds 已提交
2756 2757 2758 2759 2760 2761 2762 2763 2764 2765
						&local->mad_priv->header.recv_wc);
			spin_lock_irqsave(&recv_mad_agent->lock, flags);
			atomic_dec(&recv_mad_agent->refcount);
			spin_unlock_irqrestore(&recv_mad_agent->lock, flags);
		}

local_send_completion:
		/* Complete send */
		mad_send_wc.status = IB_WC_SUCCESS;
		mad_send_wc.vendor_err = 0;
2766
		mad_send_wc.send_buf = &local->mad_send_wr->send_buf;
L
Linus Torvalds 已提交
2767
		if (atomic_read(&mad_agent_priv->qp_info->snoop_count))
2768 2769 2770
			snoop_send(mad_agent_priv->qp_info,
				   &local->mad_send_wr->send_buf,
				   &mad_send_wc, IB_MAD_SNOOP_SEND_COMPLETIONS);
L
Linus Torvalds 已提交
2771 2772 2773 2774 2775
		mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
						   &mad_send_wc);

		spin_lock_irqsave(&mad_agent_priv->lock, flags);
		atomic_dec(&mad_agent_priv->refcount);
2776
		if (free_mad)
2777
			kfree(local->mad_priv);
L
Linus Torvalds 已提交
2778 2779 2780 2781 2782
		kfree(local);
	}
	spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
}

2783 2784 2785 2786
static int retry_send(struct ib_mad_send_wr_private *mad_send_wr)
{
	int ret;

2787
	if (!mad_send_wr->retries_left)
2788 2789
		return -ETIMEDOUT;

2790 2791 2792
	mad_send_wr->retries_left--;
	mad_send_wr->send_buf.retries++;

2793
	mad_send_wr->timeout = msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms);
2794

I
Ira Weiny 已提交
2795
	if (ib_mad_kernel_rmpp_agent(&mad_send_wr->mad_agent_priv->agent)) {
2796 2797 2798 2799 2800 2801 2802 2803 2804 2805 2806 2807 2808 2809
		ret = ib_retry_rmpp(mad_send_wr);
		switch (ret) {
		case IB_RMPP_RESULT_UNHANDLED:
			ret = ib_send_mad(mad_send_wr);
			break;
		case IB_RMPP_RESULT_CONSUMED:
			ret = 0;
			break;
		default:
			ret = -ECOMM;
			break;
		}
	} else
		ret = ib_send_mad(mad_send_wr);
2810 2811 2812 2813 2814 2815 2816 2817 2818

	if (!ret) {
		mad_send_wr->refcount++;
		list_add_tail(&mad_send_wr->agent_list,
			      &mad_send_wr->mad_agent_priv->send_list);
	}
	return ret;
}

D
David Howells 已提交
2819
static void timeout_sends(struct work_struct *work)
L
Linus Torvalds 已提交
2820 2821 2822 2823 2824 2825
{
	struct ib_mad_agent_private *mad_agent_priv;
	struct ib_mad_send_wr_private *mad_send_wr;
	struct ib_mad_send_wc mad_send_wc;
	unsigned long flags, delay;

D
David Howells 已提交
2826 2827
	mad_agent_priv = container_of(work, struct ib_mad_agent_private,
				      timed_work.work);
L
Linus Torvalds 已提交
2828 2829 2830 2831 2832 2833 2834 2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845
	mad_send_wc.vendor_err = 0;

	spin_lock_irqsave(&mad_agent_priv->lock, flags);
	while (!list_empty(&mad_agent_priv->wait_list)) {
		mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
					 struct ib_mad_send_wr_private,
					 agent_list);

		if (time_after(mad_send_wr->timeout, jiffies)) {
			delay = mad_send_wr->timeout - jiffies;
			if ((long)delay <= 0)
				delay = 1;
			queue_delayed_work(mad_agent_priv->qp_info->
					   port_priv->wq,
					   &mad_agent_priv->timed_work, delay);
			break;
		}

2846
		list_del(&mad_send_wr->agent_list);
2847 2848
		if (mad_send_wr->status == IB_WC_SUCCESS &&
		    !retry_send(mad_send_wr))
2849 2850
			continue;

L
Linus Torvalds 已提交
2851 2852
		spin_unlock_irqrestore(&mad_agent_priv->lock, flags);

2853 2854 2855 2856
		if (mad_send_wr->status == IB_WC_SUCCESS)
			mad_send_wc.status = IB_WC_RESP_TIMEOUT_ERR;
		else
			mad_send_wc.status = mad_send_wr->status;
2857
		mad_send_wc.send_buf = &mad_send_wr->send_buf;
L
Linus Torvalds 已提交
2858 2859 2860 2861 2862 2863 2864 2865 2866 2867 2868 2869 2870 2871 2872 2873 2874 2875 2876 2877 2878 2879 2880
		mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
						   &mad_send_wc);

		atomic_dec(&mad_agent_priv->refcount);
		spin_lock_irqsave(&mad_agent_priv->lock, flags);
	}
	spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
}

/*
 * Allocate receive MADs and post receive WRs for them
 */
static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
				    struct ib_mad_private *mad)
{
	unsigned long flags;
	int post, ret;
	struct ib_mad_private *mad_priv;
	struct ib_sge sg_list;
	struct ib_recv_wr recv_wr, *bad_recv_wr;
	struct ib_mad_queue *recv_queue = &qp_info->recv_queue;

	/* Initialize common scatter list fields */
2881
	sg_list.lkey = qp_info->port_priv->pd->local_dma_lkey;
L
Linus Torvalds 已提交
2882 2883 2884 2885 2886 2887 2888 2889 2890 2891 2892 2893

	/* Initialize common receive WR fields */
	recv_wr.next = NULL;
	recv_wr.sg_list = &sg_list;
	recv_wr.num_sge = 1;

	do {
		/* Allocate and map receive buffer */
		if (mad) {
			mad_priv = mad;
			mad = NULL;
		} else {
2894 2895
			mad_priv = alloc_mad_private(port_mad_size(qp_info->port_priv),
						     GFP_ATOMIC);
L
Linus Torvalds 已提交
2896 2897 2898 2899 2900
			if (!mad_priv) {
				ret = -ENOMEM;
				break;
			}
		}
2901
		sg_list.length = mad_priv_dma_size(mad_priv);
2902 2903
		sg_list.addr = ib_dma_map_single(qp_info->port_priv->device,
						 &mad_priv->grh,
2904
						 mad_priv_dma_size(mad_priv),
2905
						 DMA_FROM_DEVICE);
2906 2907 2908 2909 2910
		if (unlikely(ib_dma_mapping_error(qp_info->port_priv->device,
						  sg_list.addr))) {
			ret = -ENOMEM;
			break;
		}
2911
		mad_priv->header.mapping = sg_list.addr;
L
Linus Torvalds 已提交
2912
		mad_priv->header.mad_list.mad_queue = recv_queue;
C
Christoph Hellwig 已提交
2913 2914
		mad_priv->header.mad_list.cqe.done = ib_mad_recv_done;
		recv_wr.wr_cqe = &mad_priv->header.mad_list.cqe;
L
Linus Torvalds 已提交
2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925 2926

		/* Post receive WR */
		spin_lock_irqsave(&recv_queue->lock, flags);
		post = (++recv_queue->count < recv_queue->max_active);
		list_add_tail(&mad_priv->header.mad_list.list, &recv_queue->list);
		spin_unlock_irqrestore(&recv_queue->lock, flags);
		ret = ib_post_recv(qp_info->qp, &recv_wr, &bad_recv_wr);
		if (ret) {
			spin_lock_irqsave(&recv_queue->lock, flags);
			list_del(&mad_priv->header.mad_list.list);
			recv_queue->count--;
			spin_unlock_irqrestore(&recv_queue->lock, flags);
2927 2928
			ib_dma_unmap_single(qp_info->port_priv->device,
					    mad_priv->header.mapping,
2929
					    mad_priv_dma_size(mad_priv),
2930
					    DMA_FROM_DEVICE);
2931
			kfree(mad_priv);
2932 2933
			dev_err(&qp_info->port_priv->device->dev,
				"ib_post_recv failed: %d\n", ret);
L
Linus Torvalds 已提交
2934 2935 2936 2937 2938 2939 2940 2941 2942 2943 2944 2945 2946 2947 2948 2949
			break;
		}
	} while (post);

	return ret;
}

/*
 * Return all the posted receive MADs
 */
static void cleanup_recv_queue(struct ib_mad_qp_info *qp_info)
{
	struct ib_mad_private_header *mad_priv_hdr;
	struct ib_mad_private *recv;
	struct ib_mad_list_head *mad_list;

2950 2951 2952
	if (!qp_info->qp)
		return;

L
Linus Torvalds 已提交
2953 2954 2955 2956 2957 2958 2959 2960 2961 2962 2963 2964 2965
	while (!list_empty(&qp_info->recv_queue.list)) {

		mad_list = list_entry(qp_info->recv_queue.list.next,
				      struct ib_mad_list_head, list);
		mad_priv_hdr = container_of(mad_list,
					    struct ib_mad_private_header,
					    mad_list);
		recv = container_of(mad_priv_hdr, struct ib_mad_private,
				    header);

		/* Remove from posted receive MAD list */
		list_del(&mad_list->list);

2966 2967
		ib_dma_unmap_single(qp_info->port_priv->device,
				    recv->header.mapping,
2968
				    mad_priv_dma_size(recv),
2969
				    DMA_FROM_DEVICE);
2970
		kfree(recv);
L
Linus Torvalds 已提交
2971 2972 2973 2974 2975 2976 2977 2978 2979 2980 2981 2982 2983
	}

	qp_info->recv_queue.count = 0;
}

/*
 * Start the port
 */
static int ib_mad_port_start(struct ib_mad_port_private *port_priv)
{
	int ret, i;
	struct ib_qp_attr *attr;
	struct ib_qp *qp;
2984
	u16 pkey_index;
L
Linus Torvalds 已提交
2985 2986

	attr = kmalloc(sizeof *attr, GFP_KERNEL);
2987
	if (!attr)
L
Linus Torvalds 已提交
2988 2989
		return -ENOMEM;

2990 2991 2992 2993 2994
	ret = ib_find_pkey(port_priv->device, port_priv->port_num,
			   IB_DEFAULT_PKEY_FULL, &pkey_index);
	if (ret)
		pkey_index = 0;

L
Linus Torvalds 已提交
2995 2996
	for (i = 0; i < IB_MAD_QPS_CORE; i++) {
		qp = port_priv->qp_info[i].qp;
2997 2998 2999
		if (!qp)
			continue;

L
Linus Torvalds 已提交
3000 3001 3002 3003 3004
		/*
		 * PKey index for QP1 is irrelevant but
		 * one is needed for the Reset to Init transition
		 */
		attr->qp_state = IB_QPS_INIT;
3005
		attr->pkey_index = pkey_index;
L
Linus Torvalds 已提交
3006 3007 3008 3009
		attr->qkey = (qp->qp_num == 0) ? 0 : IB_QP1_QKEY;
		ret = ib_modify_qp(qp, attr, IB_QP_STATE |
					     IB_QP_PKEY_INDEX | IB_QP_QKEY);
		if (ret) {
3010 3011 3012
			dev_err(&port_priv->device->dev,
				"Couldn't change QP%d state to INIT: %d\n",
				i, ret);
L
Linus Torvalds 已提交
3013 3014 3015 3016 3017 3018
			goto out;
		}

		attr->qp_state = IB_QPS_RTR;
		ret = ib_modify_qp(qp, attr, IB_QP_STATE);
		if (ret) {
3019 3020 3021
			dev_err(&port_priv->device->dev,
				"Couldn't change QP%d state to RTR: %d\n",
				i, ret);
L
Linus Torvalds 已提交
3022 3023 3024 3025 3026 3027 3028
			goto out;
		}

		attr->qp_state = IB_QPS_RTS;
		attr->sq_psn = IB_MAD_SEND_Q_PSN;
		ret = ib_modify_qp(qp, attr, IB_QP_STATE | IB_QP_SQ_PSN);
		if (ret) {
3029 3030 3031
			dev_err(&port_priv->device->dev,
				"Couldn't change QP%d state to RTS: %d\n",
				i, ret);
L
Linus Torvalds 已提交
3032 3033 3034 3035 3036 3037
			goto out;
		}
	}

	ret = ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
	if (ret) {
3038 3039 3040
		dev_err(&port_priv->device->dev,
			"Failed to request completion notification: %d\n",
			ret);
L
Linus Torvalds 已提交
3041 3042 3043 3044
		goto out;
	}

	for (i = 0; i < IB_MAD_QPS_CORE; i++) {
3045 3046 3047
		if (!port_priv->qp_info[i].qp)
			continue;

L
Linus Torvalds 已提交
3048 3049
		ret = ib_mad_post_receive_mads(&port_priv->qp_info[i], NULL);
		if (ret) {
3050 3051
			dev_err(&port_priv->device->dev,
				"Couldn't post receive WRs\n");
L
Linus Torvalds 已提交
3052 3053 3054 3055 3056 3057 3058 3059 3060 3061 3062 3063 3064
			goto out;
		}
	}
out:
	kfree(attr);
	return ret;
}

static void qp_event_handler(struct ib_event *event, void *qp_context)
{
	struct ib_mad_qp_info	*qp_info = qp_context;

	/* It's worse than that! He's dead, Jim! */
3065 3066
	dev_err(&qp_info->port_priv->device->dev,
		"Fatal error (%d) on MAD QP (%d)\n",
L
Linus Torvalds 已提交
3067 3068 3069 3070 3071 3072 3073 3074 3075 3076 3077 3078 3079 3080 3081 3082 3083 3084 3085 3086 3087 3088 3089 3090 3091 3092 3093 3094 3095 3096 3097 3098 3099 3100 3101
		event->event, qp_info->qp->qp_num);
}

static void init_mad_queue(struct ib_mad_qp_info *qp_info,
			   struct ib_mad_queue *mad_queue)
{
	mad_queue->qp_info = qp_info;
	mad_queue->count = 0;
	spin_lock_init(&mad_queue->lock);
	INIT_LIST_HEAD(&mad_queue->list);
}

static void init_mad_qp(struct ib_mad_port_private *port_priv,
			struct ib_mad_qp_info *qp_info)
{
	qp_info->port_priv = port_priv;
	init_mad_queue(qp_info, &qp_info->send_queue);
	init_mad_queue(qp_info, &qp_info->recv_queue);
	INIT_LIST_HEAD(&qp_info->overflow_list);
	spin_lock_init(&qp_info->snoop_lock);
	qp_info->snoop_table = NULL;
	qp_info->snoop_table_size = 0;
	atomic_set(&qp_info->snoop_count, 0);
}

static int create_mad_qp(struct ib_mad_qp_info *qp_info,
			 enum ib_qp_type qp_type)
{
	struct ib_qp_init_attr	qp_init_attr;
	int ret;

	memset(&qp_init_attr, 0, sizeof qp_init_attr);
	qp_init_attr.send_cq = qp_info->port_priv->cq;
	qp_init_attr.recv_cq = qp_info->port_priv->cq;
	qp_init_attr.sq_sig_type = IB_SIGNAL_ALL_WR;
3102 3103
	qp_init_attr.cap.max_send_wr = mad_sendq_size;
	qp_init_attr.cap.max_recv_wr = mad_recvq_size;
L
Linus Torvalds 已提交
3104 3105 3106 3107 3108 3109 3110 3111
	qp_init_attr.cap.max_send_sge = IB_MAD_SEND_REQ_MAX_SG;
	qp_init_attr.cap.max_recv_sge = IB_MAD_RECV_REQ_MAX_SG;
	qp_init_attr.qp_type = qp_type;
	qp_init_attr.port_num = qp_info->port_priv->port_num;
	qp_init_attr.qp_context = qp_info;
	qp_init_attr.event_handler = qp_event_handler;
	qp_info->qp = ib_create_qp(qp_info->port_priv->pd, &qp_init_attr);
	if (IS_ERR(qp_info->qp)) {
3112 3113 3114
		dev_err(&qp_info->port_priv->device->dev,
			"Couldn't create ib_mad QP%d\n",
			get_spl_qp_index(qp_type));
L
Linus Torvalds 已提交
3115 3116 3117 3118
		ret = PTR_ERR(qp_info->qp);
		goto error;
	}
	/* Use minimum queue sizes unless the CQ is resized */
3119 3120
	qp_info->send_queue.max_active = mad_sendq_size;
	qp_info->recv_queue.max_active = mad_recvq_size;
L
Linus Torvalds 已提交
3121 3122 3123 3124 3125 3126 3127 3128
	return 0;

error:
	return ret;
}

static void destroy_mad_qp(struct ib_mad_qp_info *qp_info)
{
3129 3130 3131
	if (!qp_info->qp)
		return;

L
Linus Torvalds 已提交
3132
	ib_destroy_qp(qp_info->qp);
3133
	kfree(qp_info->snoop_table);
L
Linus Torvalds 已提交
3134 3135 3136 3137 3138 3139 3140 3141 3142 3143 3144 3145 3146
}

/*
 * Open the port
 * Create the QP, PD, MR, and CQ if needed
 */
static int ib_mad_port_open(struct ib_device *device,
			    int port_num)
{
	int ret, cq_size;
	struct ib_mad_port_private *port_priv;
	unsigned long flags;
	char name[sizeof "ib_mad123"];
3147
	int has_smi;
L
Linus Torvalds 已提交
3148

3149 3150 3151
	if (WARN_ON(rdma_max_mad_size(device, port_num) < IB_MGMT_MAD_SIZE))
		return -EFAULT;

3152 3153 3154 3155
	if (WARN_ON(rdma_cap_opa_mad(device, port_num) &&
		    rdma_max_mad_size(device, port_num) < OPA_MGMT_MAD_SIZE))
		return -EFAULT;

L
Linus Torvalds 已提交
3156
	/* Create new device info */
R
Roland Dreier 已提交
3157
	port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL);
3158
	if (!port_priv)
L
Linus Torvalds 已提交
3159
		return -ENOMEM;
R
Roland Dreier 已提交
3160

L
Linus Torvalds 已提交
3161 3162 3163 3164 3165 3166 3167
	port_priv->device = device;
	port_priv->port_num = port_num;
	spin_lock_init(&port_priv->reg_lock);
	INIT_LIST_HEAD(&port_priv->agent_list);
	init_mad_qp(port_priv, &port_priv->qp_info[0]);
	init_mad_qp(port_priv, &port_priv->qp_info[1]);

3168
	cq_size = mad_sendq_size + mad_recvq_size;
3169
	has_smi = rdma_cap_ib_smi(device, port_num);
3170 3171 3172
	if (has_smi)
		cq_size *= 2;

C
Christoph Hellwig 已提交
3173 3174
	port_priv->cq = ib_alloc_cq(port_priv->device, port_priv, cq_size, 0,
			IB_POLL_WORKQUEUE);
L
Linus Torvalds 已提交
3175
	if (IS_ERR(port_priv->cq)) {
3176
		dev_err(&device->dev, "Couldn't create ib_mad CQ\n");
L
Linus Torvalds 已提交
3177 3178 3179 3180
		ret = PTR_ERR(port_priv->cq);
		goto error3;
	}

3181
	port_priv->pd = ib_alloc_pd(device, 0);
L
Linus Torvalds 已提交
3182
	if (IS_ERR(port_priv->pd)) {
3183
		dev_err(&device->dev, "Couldn't create ib_mad PD\n");
L
Linus Torvalds 已提交
3184 3185 3186 3187
		ret = PTR_ERR(port_priv->pd);
		goto error4;
	}

3188 3189 3190 3191 3192
	if (has_smi) {
		ret = create_mad_qp(&port_priv->qp_info[0], IB_QPT_SMI);
		if (ret)
			goto error6;
	}
L
Linus Torvalds 已提交
3193 3194 3195 3196 3197
	ret = create_mad_qp(&port_priv->qp_info[1], IB_QPT_GSI);
	if (ret)
		goto error7;

	snprintf(name, sizeof name, "ib_mad%d", port_num);
3198
	port_priv->wq = alloc_ordered_workqueue(name, WQ_MEM_RECLAIM);
L
Linus Torvalds 已提交
3199 3200 3201 3202 3203
	if (!port_priv->wq) {
		ret = -ENOMEM;
		goto error8;
	}

3204 3205 3206 3207
	spin_lock_irqsave(&ib_mad_port_list_lock, flags);
	list_add_tail(&port_priv->port_list, &ib_mad_port_list);
	spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);

L
Linus Torvalds 已提交
3208 3209
	ret = ib_mad_port_start(port_priv);
	if (ret) {
3210
		dev_err(&device->dev, "Couldn't start port\n");
L
Linus Torvalds 已提交
3211 3212 3213 3214 3215 3216
		goto error9;
	}

	return 0;

error9:
3217 3218 3219 3220
	spin_lock_irqsave(&ib_mad_port_list_lock, flags);
	list_del_init(&port_priv->port_list);
	spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);

L
Linus Torvalds 已提交
3221 3222 3223 3224 3225 3226 3227 3228
	destroy_workqueue(port_priv->wq);
error8:
	destroy_mad_qp(&port_priv->qp_info[1]);
error7:
	destroy_mad_qp(&port_priv->qp_info[0]);
error6:
	ib_dealloc_pd(port_priv->pd);
error4:
C
Christoph Hellwig 已提交
3229
	ib_free_cq(port_priv->cq);
L
Linus Torvalds 已提交
3230 3231 3232 3233 3234 3235 3236 3237 3238 3239 3240 3241 3242 3243 3244 3245 3246 3247 3248 3249 3250 3251
	cleanup_recv_queue(&port_priv->qp_info[1]);
	cleanup_recv_queue(&port_priv->qp_info[0]);
error3:
	kfree(port_priv);

	return ret;
}

/*
 * Close the port
 * If there are no classes using the port, free the port
 * resources (CQ, MR, PD, QP) and remove the port's info structure
 */
static int ib_mad_port_close(struct ib_device *device, int port_num)
{
	struct ib_mad_port_private *port_priv;
	unsigned long flags;

	spin_lock_irqsave(&ib_mad_port_list_lock, flags);
	port_priv = __ib_get_mad_port(device, port_num);
	if (port_priv == NULL) {
		spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
3252
		dev_err(&device->dev, "Port %d not found\n", port_num);
L
Linus Torvalds 已提交
3253 3254
		return -ENODEV;
	}
3255
	list_del_init(&port_priv->port_list);
L
Linus Torvalds 已提交
3256 3257 3258 3259 3260 3261
	spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);

	destroy_workqueue(port_priv->wq);
	destroy_mad_qp(&port_priv->qp_info[1]);
	destroy_mad_qp(&port_priv->qp_info[0]);
	ib_dealloc_pd(port_priv->pd);
C
Christoph Hellwig 已提交
3262
	ib_free_cq(port_priv->cq);
L
Linus Torvalds 已提交
3263 3264 3265 3266 3267 3268 3269 3270 3271 3272 3273
	cleanup_recv_queue(&port_priv->qp_info[1]);
	cleanup_recv_queue(&port_priv->qp_info[0]);
	/* XXX: Handle deallocation of MAD registration tables */

	kfree(port_priv);

	return 0;
}

static void ib_mad_init_device(struct ib_device *device)
{
3274
	int start, i;
L
Linus Torvalds 已提交
3275

3276
	start = rdma_start_port(device);
3277

3278
	for (i = start; i <= rdma_end_port(device); i++) {
3279
		if (!rdma_cap_ib_mad(device, i))
3280 3281
			continue;

3282
		if (ib_mad_port_open(device, i)) {
3283
			dev_err(&device->dev, "Couldn't open port %d\n", i);
3284
			goto error;
L
Linus Torvalds 已提交
3285
		}
3286
		if (ib_agent_port_open(device, i)) {
3287 3288
			dev_err(&device->dev,
				"Couldn't open port %d for agents\n", i);
3289
			goto error_agent;
L
Linus Torvalds 已提交
3290 3291
		}
	}
3292
	return;
L
Linus Torvalds 已提交
3293

3294 3295
error_agent:
	if (ib_mad_port_close(device, i))
3296
		dev_err(&device->dev, "Couldn't close port %d\n", i);
3297 3298

error:
3299
	while (--i >= start) {
3300
		if (!rdma_cap_ib_mad(device, i))
3301
			continue;
3302 3303

		if (ib_agent_port_close(device, i))
3304 3305
			dev_err(&device->dev,
				"Couldn't close port %d for agents\n", i);
3306
		if (ib_mad_port_close(device, i))
3307
			dev_err(&device->dev, "Couldn't close port %d\n", i);
L
Linus Torvalds 已提交
3308 3309 3310
	}
}

3311
static void ib_mad_remove_device(struct ib_device *device, void *client_data)
L
Linus Torvalds 已提交
3312
{
3313
	int i;
3314

3315
	for (i = rdma_start_port(device); i <= rdma_end_port(device); i++) {
3316
		if (!rdma_cap_ib_mad(device, i))
3317 3318 3319
			continue;

		if (ib_agent_port_close(device, i))
3320
			dev_err(&device->dev,
3321 3322 3323
				"Couldn't close port %d for agents\n", i);
		if (ib_mad_port_close(device, i))
			dev_err(&device->dev, "Couldn't close port %d\n", i);
L
Linus Torvalds 已提交
3324 3325 3326 3327 3328 3329 3330 3331 3332
	}
}

static struct ib_client mad_client = {
	.name   = "mad",
	.add = ib_mad_init_device,
	.remove = ib_mad_remove_device
};

3333
int ib_mad_init(void)
L
Linus Torvalds 已提交
3334
{
3335 3336 3337 3338 3339 3340
	mad_recvq_size = min(mad_recvq_size, IB_MAD_QP_MAX_SIZE);
	mad_recvq_size = max(mad_recvq_size, IB_MAD_QP_MIN_SIZE);

	mad_sendq_size = min(mad_sendq_size, IB_MAD_QP_MAX_SIZE);
	mad_sendq_size = max(mad_sendq_size, IB_MAD_QP_MIN_SIZE);

L
Linus Torvalds 已提交
3341 3342 3343
	INIT_LIST_HEAD(&ib_mad_port_list);

	if (ib_register_client(&mad_client)) {
3344
		pr_err("Couldn't register ib_mad client\n");
3345
		return -EINVAL;
L
Linus Torvalds 已提交
3346 3347 3348 3349 3350
	}

	return 0;
}

3351
void ib_mad_cleanup(void)
L
Linus Torvalds 已提交
3352 3353 3354
{
	ib_unregister_client(&mad_client);
}