--- /dev/null
+/*
+ * Copyright (c) 2004-2007 Voltaire, Inc. All rights reserved.
+ * Copyright (c) 2005 Intel Corporation. All rights reserved.
+ * Copyright (c) 2005 Mellanox Technologies Ltd. All rights reserved.
+ * Copyright (c) 2009 HNR Consulting. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses. You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials
+ * provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/dma-mapping.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <rdma/ib_cache.h>
+
+#include "mad_priv.h"
+#include "mad_rmpp.h"
+#include "smi.h"
+#include "agent.h"
+
+MODULE_LICENSE("Dual BSD/GPL");
+MODULE_DESCRIPTION("kernel IB MAD API");
+MODULE_AUTHOR("Hal Rosenstock");
+MODULE_AUTHOR("Sean Hefty");
+
+static int mad_sendq_size = IB_MAD_QP_SEND_SIZE;
+static int mad_recvq_size = IB_MAD_QP_RECV_SIZE;
+
+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");
+
+static struct kmem_cache *ib_mad_cache;
+
+static struct list_head ib_mad_port_list;
+static u32 ib_mad_client_id = 0;
+
+/* Port list lock */
+static DEFINE_SPINLOCK(ib_mad_port_list_lock);
+
+/* 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,
+ struct ib_mad *mad);
+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);
+static void timeout_sends(struct work_struct *work);
+static void local_completions(struct work_struct *work);
+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);
+
+/*
+ * 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;
+}
+
+int ib_response_mad(struct ib_mad *mad)
+{
+ return ((mad->mad_hdr.method & IB_MGMT_METHOD_RESP) ||
+ (mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS) ||
+ ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_BM) &&
+ (mad->mad_hdr.attr_mod & IB_BM_ATTR_MOD_RESP)));
+}
+EXPORT_SYMBOL(ib_response_mad);
+
+/*
+ * ib_register_mad_agent - Register to send/receive MADs
+ */
+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,
+ void *context,
+ u32 registration_flags)
+{
+ 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;
+ unsigned long flags;
+ u8 mgmt_class, vclass;
+
+ /* Validate parameters */
+ qpn = get_spl_qp_index(qp_type);
+ if (qpn == -1) {
+ dev_notice(&device->dev,
+ "ib_register_mad_agent: invalid QP Type %d\n",
+ qp_type);
+ goto error1;
+ }
+
+ if (rmpp_version && rmpp_version != IB_MGMT_RMPP_VERSION) {
+ dev_notice(&device->dev,
+ "ib_register_mad_agent: invalid RMPP Version %u\n",
+ rmpp_version);
+ goto error1;
+ }
+
+ /* Validate MAD registration request if supplied */
+ if (mad_reg_req) {
+ 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);
+ goto error1;
+ }
+ if (!recv_handler) {
+ dev_notice(&device->dev,
+ "ib_register_mad_agent: no recv_handler\n");
+ goto error1;
+ }
+ 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 !=
+ 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);
+ goto error1;
+ }
+ } 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
+ */
+ dev_notice(&device->dev,
+ "ib_register_mad_agent: Invalid Mgmt Class 0\n");
+ 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
+ */
+ 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);
+ goto error1;
+ }
+ }
+ /* Make sure class supplied is consistent with RMPP */
+ if (!ib_is_mad_class_rmpp(mad_reg_req->mgmt_class)) {
+ 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);
+ goto error1;
+ }
+ }
+
+ /* 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 !=
+ 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);
+ goto error1;
+ }
+ } else {
+ if ((mad_reg_req->mgmt_class ==
+ IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
+ (mad_reg_req->mgmt_class ==
+ 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);
+ goto error1;
+ }
+ }
+ } else {
+ /* No registration request supplied */
+ if (!send_handler)
+ goto error1;
+ if (registration_flags & IB_MAD_USER_RMPP)
+ goto error1;
+ }
+
+ /* Validate device and port */
+ port_priv = ib_get_mad_port(device, port_num);
+ if (!port_priv) {
+ dev_notice(&device->dev, "ib_register_mad_agent: Invalid port\n");
+ ret = ERR_PTR(-ENODEV);
+ goto error1;
+ }
+
+ /* Verify the QP requested is supported. For example, Ethernet devices
+ * will not have QP0 */
+ if (!port_priv->qp_info[qpn].qp) {
+ dev_notice(&device->dev,
+ "ib_register_mad_agent: QP %d not supported\n", qpn);
+ ret = ERR_PTR(-EPROTONOSUPPORT);
+ goto error1;
+ }
+
+ /* Allocate structures */
+ mad_agent_priv = kzalloc(sizeof *mad_agent_priv, GFP_KERNEL);
+ if (!mad_agent_priv) {
+ ret = ERR_PTR(-ENOMEM);
+ goto error1;
+ }
+
+ mad_agent_priv->agent.mr = ib_get_dma_mr(port_priv->qp_info[qpn].qp->pd,
+ IB_ACCESS_LOCAL_WRITE);
+ if (IS_ERR(mad_agent_priv->agent.mr)) {
+ ret = ERR_PTR(-ENOMEM);
+ goto error2;
+ }
+
+ if (mad_reg_req) {
+ reg_req = kmemdup(mad_reg_req, sizeof *reg_req, GFP_KERNEL);
+ if (!reg_req) {
+ ret = ERR_PTR(-ENOMEM);
+ goto error3;
+ }
+ }
+
+ /* Now, fill in the various structures */
+ mad_agent_priv->qp_info = &port_priv->qp_info[qpn];
+ mad_agent_priv->reg_req = reg_req;
+ mad_agent_priv->agent.rmpp_version = rmpp_version;
+ 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;
+ mad_agent_priv->agent.flags = registration_flags;
+ 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);
+
+ spin_lock_irqsave(&port_priv->reg_lock, flags);
+ mad_agent_priv->agent.hi_tid = ++ib_mad_client_id;
+
+ /*
+ * 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))
+ goto error4;
+ }
+ }
+ 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))
+ goto error4;
+ }
+ }
+ ret2 = add_oui_reg_req(mad_reg_req, mad_agent_priv);
+ }
+ if (ret2) {
+ ret = ERR_PTR(ret2);
+ goto error4;
+ }
+ }
+
+ /* Add mad agent into port's agent list */
+ list_add_tail(&mad_agent_priv->agent_list, &port_priv->agent_list);
+ spin_unlock_irqrestore(&port_priv->reg_lock, flags);
+
+ return &mad_agent_priv->agent;
+
+error4:
+ spin_unlock_irqrestore(&port_priv->reg_lock, flags);
+ kfree(reg_req);
+error3:
+ ib_dereg_mr(mad_agent_priv->agent.mr);
+error2:
+ kfree(mad_agent_priv);
+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. */
+ new_snoop_table = krealloc(qp_info->snoop_table,
+ sizeof mad_snoop_priv *
+ (qp_info->snoop_table_size + 1),
+ GFP_ATOMIC);
+ if (!new_snoop_table) {
+ i = -ENOMEM;
+ goto out;
+ }
+
+ 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;
+
+ /* 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 */
+ mad_snoop_priv = kzalloc(sizeof *mad_snoop_priv, GFP_KERNEL);
+ 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;
+ init_completion(&mad_snoop_priv->comp);
+ 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);
+ goto error2;
+ }
+
+ atomic_set(&mad_snoop_priv->refcount, 1);
+ return &mad_snoop_priv->agent;
+
+error2:
+ kfree(mad_snoop_priv);
+error1:
+ return ret;
+}
+EXPORT_SYMBOL(ib_register_mad_snoop);
+
+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);
+}
+
+static void unregister_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
+{
+ struct ib_mad_port_private *port_priv;
+ unsigned long flags;
+
+ /* 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);
+
+ spin_lock_irqsave(&port_priv->reg_lock, flags);
+ remove_mad_reg_req(mad_agent_priv);
+ list_del(&mad_agent_priv->agent_list);
+ spin_unlock_irqrestore(&port_priv->reg_lock, flags);
+
+ flush_workqueue(port_priv->wq);
+ ib_cancel_rmpp_recvs(mad_agent_priv);
+
+ deref_mad_agent(mad_agent_priv);
+ wait_for_completion(&mad_agent_priv->comp);
+
+ kfree(mad_agent_priv->reg_req);
+ ib_dereg_mr(mad_agent_priv->agent.mr);
+ 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);
+
+ deref_snoop_agent(mad_snoop_priv);
+ wait_for_completion(&mad_snoop_priv->comp);
+
+ kfree(mad_snoop_priv);
+}
+
+/*
+ * ib_unregister_mad_agent - Unregisters a client from using MAD services
+ */
+int ib_unregister_mad_agent(struct ib_mad_agent *mad_agent)
+{
+ 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);
+ }
+ return 0;
+}
+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;
+
+ BUG_ON(!mad_list->mad_queue);
+ 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,
+ struct ib_mad_send_buf *send_buf,
+ 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,
+ send_buf, mad_send_wc);
+ deref_snoop_agent(mad_snoop_priv);
+ 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);
+ mad_snoop_priv->agent.recv_handler(&mad_snoop_priv->agent,
+ mad_recv_wc);
+ deref_snoop_agent(mad_snoop_priv);
+ spin_lock_irqsave(&qp_info->snoop_lock, flags);
+ }
+ spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
+}
+
+static void build_smp_wc(struct ib_qp *qp,
+ u64 wr_id, u16 slid, u16 pkey_index, u8 port_num,
+ struct ib_wc *wc)
+{
+ memset(wc, 0, sizeof *wc);
+ wc->wr_id = wr_id;
+ 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;
+ wc->qp = qp;
+ wc->slid = slid;
+ wc->sl = 0;
+ wc->dlid_path_bits = 0;
+ wc->port_num = port_num;
+}
+
+/*
+ * 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,
+ struct ib_mad_send_wr_private *mad_send_wr)
+{
+ int ret = 0;
+ struct ib_smp *smp = mad_send_wr->send_buf.mad;
+ 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;
+ u8 port_num;
+ struct ib_wc mad_wc;
+ struct ib_send_wr *send_wr = &mad_send_wr->send_wr;
+
+ if (device->node_type == RDMA_NODE_IB_SWITCH &&
+ smp->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
+ port_num = send_wr->wr.ud.port_num;
+ else
+ port_num = mad_agent_priv->agent.port_num;
+
+ /*
+ * 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.
+ */
+ if ((ib_get_smp_direction(smp) ? smp->dr_dlid : smp->dr_slid) ==
+ IB_LID_PERMISSIVE &&
+ smi_handle_dr_smp_send(smp, device->node_type, port_num) ==
+ IB_SMI_DISCARD) {
+ ret = -EINVAL;
+ dev_err(&device->dev, "Invalid directed route\n");
+ goto out;
+ }
+
+ /* 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;
+
+ local = kmalloc(sizeof *local, GFP_ATOMIC);
+ if (!local) {
+ ret = -ENOMEM;
+ dev_err(&device->dev, "No memory for ib_mad_local_private\n");
+ goto out;
+ }
+ local->mad_priv = NULL;
+ local->recv_mad_agent = NULL;
+ mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_ATOMIC);
+ if (!mad_priv) {
+ ret = -ENOMEM;
+ dev_err(&device->dev, "No memory for local response MAD\n");
+ kfree(local);
+ goto out;
+ }
+
+ build_smp_wc(mad_agent_priv->agent.qp,
+ send_wr->wr_id, be16_to_cpu(smp->dr_slid),
+ send_wr->wr.ud.pkey_index,
+ send_wr->wr.ud.port_num, &mad_wc);
+
+ /* No GRH for DR SMP */
+ ret = device->process_mad(device, 0, port_num, &mad_wc, NULL,
+ (struct ib_mad *)smp,
+ (struct ib_mad *)&mad_priv->mad);
+ switch (ret)
+ {
+ case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY:
+ if (ib_response_mad(&mad_priv->mad.mad) &&
+ 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
+ kmem_cache_free(ib_mad_cache, mad_priv);
+ break;
+ case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED:
+ kmem_cache_free(ib_mad_cache, mad_priv);
+ break;
+ 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) {
+ memcpy(&mad_priv->mad.mad, smp, sizeof(struct ib_mad));
+ recv_mad_agent = find_mad_agent(port_priv,
+ &mad_priv->mad.mad);
+ }
+ if (!port_priv || !recv_mad_agent) {
+ /*
+ * No receiving agent so drop packet and
+ * generate send completion.
+ */
+ kmem_cache_free(ib_mad_cache, mad_priv);
+ break;
+ }
+ local->mad_priv = mad_priv;
+ local->recv_mad_agent = recv_mad_agent;
+ break;
+ default:
+ kmem_cache_free(ib_mad_cache, mad_priv);
+ kfree(local);
+ ret = -EINVAL;
+ goto out;
+ }
+
+ local->mad_send_wr = mad_send_wr;
+ /* 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,
+ &mad_agent_priv->local_work);
+ ret = 1;
+out:
+ return ret;
+}
+
+static int get_pad_size(int hdr_len, int data_len)
+{
+ int seg_size, pad;
+
+ seg_size = sizeof(struct ib_mad) - hdr_len;
+ if (data_len && seg_size) {
+ pad = seg_size - data_len % seg_size;
+ return pad == seg_size ? 0 : pad;
+ } else
+ 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,
+ gfp_t gfp_mask)
+{
+ 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;
+
+ send_buf->seg_size = sizeof (struct ib_mad) - send_buf->hdr_len;
+ 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) {
+ dev_err(&send_buf->mad_agent->device->dev,
+ "alloc_send_rmpp_segs: RMPP mem alloc failed for len %zd, gfp %#x\n",
+ sizeof (*seg) + seg_size, gfp_mask);
+ 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;
+}
+
+int ib_mad_kernel_rmpp_agent(struct ib_mad_agent *agent)
+{
+ return agent->rmpp_version && !(agent->flags & IB_MAD_USER_RMPP);
+}
+EXPORT_SYMBOL(ib_mad_kernel_rmpp_agent);
+
+struct ib_mad_send_buf * ib_create_send_mad(struct ib_mad_agent *mad_agent,
+ u32 remote_qpn, u16 pkey_index,
+ int rmpp_active,
+ int hdr_len, int data_len,
+ gfp_t gfp_mask)
+{
+ struct ib_mad_agent_private *mad_agent_priv;
+ struct ib_mad_send_wr_private *mad_send_wr;
+ int pad, message_size, ret, size;
+ void *buf;
+
+ mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
+ agent);
+ pad = get_pad_size(hdr_len, data_len);
+ message_size = hdr_len + data_len + pad;
+
+ if (ib_mad_kernel_rmpp_agent(mad_agent)) {
+ if (!rmpp_active && message_size > sizeof(struct ib_mad))
+ return ERR_PTR(-EINVAL);
+ } else
+ if (rmpp_active || message_size > sizeof(struct ib_mad))
+ return ERR_PTR(-EINVAL);
+
+ size = rmpp_active ? hdr_len : sizeof(struct ib_mad);
+ buf = kzalloc(sizeof *mad_send_wr + size, gfp_mask);
+ if (!buf)
+ return ERR_PTR(-ENOMEM);
+
+ mad_send_wr = buf + size;
+ INIT_LIST_HEAD(&mad_send_wr->rmpp_list);
+ mad_send_wr->send_buf.mad = buf;
+ mad_send_wr->send_buf.hdr_len = hdr_len;
+ mad_send_wr->send_buf.data_len = data_len;
+ mad_send_wr->pad = pad;
+
+ mad_send_wr->mad_agent_priv = mad_agent_priv;
+ mad_send_wr->sg_list[0].length = hdr_len;
+ mad_send_wr->sg_list[0].lkey = mad_agent->mr->lkey;
+ mad_send_wr->sg_list[1].length = sizeof(struct ib_mad) - hdr_len;
+ mad_send_wr->sg_list[1].lkey = mad_agent->mr->lkey;
+
+ mad_send_wr->send_wr.wr_id = (unsigned long) mad_send_wr;
+ mad_send_wr->send_wr.sg_list = mad_send_wr->sg_list;
+ mad_send_wr->send_wr.num_sge = 2;
+ mad_send_wr->send_wr.opcode = IB_WR_SEND;
+ mad_send_wr->send_wr.send_flags = IB_SEND_SIGNALED;
+ mad_send_wr->send_wr.wr.ud.remote_qpn = remote_qpn;
+ mad_send_wr->send_wr.wr.ud.remote_qkey = IB_QP_SET_QKEY;
+ mad_send_wr->send_wr.wr.ud.pkey_index = pkey_index;
+
+ if (rmpp_active) {
+ ret = alloc_send_rmpp_list(mad_send_wr, gfp_mask);
+ if (ret) {
+ kfree(buf);
+ return ERR_PTR(ret);
+ }
+ }
+
+ mad_send_wr->send_buf.mad_agent = mad_agent;
+ atomic_inc(&mad_agent_priv->refcount);
+ return &mad_send_wr->send_buf;
+}
+EXPORT_SYMBOL(ib_create_send_mad);
+
+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);
+
+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;
+}
+
+void ib_free_send_mad(struct ib_mad_send_buf *send_buf)
+{
+ struct ib_mad_agent_private *mad_agent_priv;
+ struct ib_mad_send_wr_private *mad_send_wr;
+
+ mad_agent_priv = container_of(send_buf->mad_agent,
+ struct ib_mad_agent_private, agent);
+ mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
+ send_buf);
+
+ free_send_rmpp_list(mad_send_wr);
+ kfree(send_buf->mad);
+ deref_mad_agent(mad_agent_priv);
+}
+EXPORT_SYMBOL(ib_free_send_mad);
+
+int ib_send_mad(struct ib_mad_send_wr_private *mad_send_wr)
+{
+ struct ib_mad_qp_info *qp_info;
+ struct list_head *list;
+ struct ib_send_wr *bad_send_wr;
+ struct ib_mad_agent *mad_agent;
+ struct ib_sge *sge;
+ unsigned long flags;
+ int ret;
+
+ /* Set WR ID to find mad_send_wr upon completion */
+ qp_info = mad_send_wr->mad_agent_priv->qp_info;
+ mad_send_wr->send_wr.wr_id = (unsigned long)&mad_send_wr->mad_list;
+ mad_send_wr->mad_list.mad_queue = &qp_info->send_queue;
+
+ mad_agent = mad_send_wr->send_buf.mad_agent;
+ sge = mad_send_wr->sg_list;
+ sge[0].addr = ib_dma_map_single(mad_agent->device,
+ mad_send_wr->send_buf.mad,
+ sge[0].length,
+ DMA_TO_DEVICE);
+ if (unlikely(ib_dma_mapping_error(mad_agent->device, sge[0].addr)))
+ return -ENOMEM;
+
+ 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);
+ 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;
+ }
+ mad_send_wr->payload_mapping = sge[1].addr;
+
+ spin_lock_irqsave(&qp_info->send_queue.lock, flags);
+ if (qp_info->send_queue.count < qp_info->send_queue.max_active) {
+ ret = ib_post_send(mad_agent->qp, &mad_send_wr->send_wr,
+ &bad_send_wr);
+ list = &qp_info->send_queue.list;
+ } else {
+ ret = 0;
+ list = &qp_info->overflow_list;
+ }
+
+ 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);
+ if (ret) {
+ 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);
+ }
+ return ret;
+}
+
+/*
+ * ib_post_send_mad - Posts MAD(s) to the send queue of the QP associated
+ * with the registered client
+ */
+int ib_post_send_mad(struct ib_mad_send_buf *send_buf,
+ struct ib_mad_send_buf **bad_send_buf)
+{
+ struct ib_mad_agent_private *mad_agent_priv;
+ struct ib_mad_send_buf *next_send_buf;
+ struct ib_mad_send_wr_private *mad_send_wr;
+ unsigned long flags;
+ int ret = -EINVAL;
+
+ /* Walk list of send WRs and post each on send list */
+ 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;
+
+ if (!send_buf->mad_agent->send_handler ||
+ (send_buf->timeout_ms &&
+ !send_buf->mad_agent->recv_handler)) {
+ ret = -EINVAL;
+ goto error;
+ }
+
+ 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;
+ }
+ }
+
+ /*
+ * 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
+ */
+ next_send_buf = send_buf->next;
+ mad_send_wr->send_wr.wr.ud.ah = send_buf->ah;
+
+ 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);
+ if (ret < 0) /* error */
+ goto error;
+ else if (ret == 1) /* locally consumed */
+ continue;
+ }
+
+ mad_send_wr->tid = ((struct ib_mad_hdr *) send_buf->mad)->tid;
+ /* Timeout will be updated after send completes */
+ mad_send_wr->timeout = msecs_to_jiffies(send_buf->timeout_ms);
+ mad_send_wr->max_retries = send_buf->retries;
+ mad_send_wr->retries_left = send_buf->retries;
+ send_buf->retries = 0;
+ /* Reference for work request to QP + response */
+ 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);
+
+ if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) {
+ 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) {
+ /* 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);
+ goto error;
+ }
+ }
+ return 0;
+error:
+ if (bad_send_buf)
+ *bad_send_buf = send_buf;
+ 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)
+{
+ struct ib_mad_recv_buf *mad_recv_buf, *temp_recv_buf;
+ struct ib_mad_private_header *mad_priv_hdr;
+ struct ib_mad_private *priv;
+ struct list_head free_list;
+
+ INIT_LIST_HEAD(&free_list);
+ list_splice_init(&mad_recv_wc->rmpp_list, &free_list);
+
+ 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);
+ 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);
+ kmem_cache_free(ib_mad_cache, priv);
+ }
+}
+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)
+{
+ dev_err(&mad_agent->device->dev,
+ "ib_process_mad_wc() not implemented yet\n");
+ 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;
+
+ for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS) {
+ if ((*method)->agent[i]) {
+ pr_err("Method %d already in use\n", i);
+ return -EINVAL;
+ }
+ }
+ return 0;
+}
+
+static int allocate_method_table(struct ib_mad_mgmt_method_table **method)
+{
+ /* Allocate management method table */
+ *method = kzalloc(sizeof **method, GFP_ATOMIC);
+ if (!*method) {
+ pr_err("No memory for ib_mad_mgmt_method_table\n");
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+/*
+ * 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,
+ char *oui)
+{
+ int i;
+
+ for (i = 0; i < MAX_MGMT_OUI; i++)
+ /* Is there matching OUI for this vendor class ? */
+ if (!memcmp(vendor_class->oui[i], oui, 3))
+ 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 */
+ *class = kzalloc(sizeof **class, GFP_ATOMIC);
+ if (!*class) {
+ dev_err(&agent_priv->agent.device->dev,
+ "No memory for ib_mad_mgmt_class_table\n");
+ ret = -ENOMEM;
+ goto error1;
+ }
+
+ /* 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 */
+ for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS)
+ (*method)->agent[i] = agent_priv;
+
+ 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 */
+ vendor = kzalloc(sizeof *vendor, GFP_ATOMIC);
+ if (!vendor) {
+ dev_err(&agent_priv->agent.device->dev,
+ "No memory for ib_mad_mgmt_vendor_class_table\n");
+ goto error1;
+ }
+
+ *vendor_table = vendor;
+ }
+ if (!(*vendor_table)->vendor_class[vclass]) {
+ /* Allocate table for this management vendor class */
+ vendor_class = kzalloc(sizeof *vendor_class, GFP_ATOMIC);
+ if (!vendor_class) {
+ dev_err(&agent_priv->agent.device->dev,
+ "No memory for ib_mad_mgmt_vendor_class\n");
+ goto error2;
+ }
+
+ (*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];
+ BUG_ON(!*method);
+ 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];
+ BUG_ON(*method);
+ /* Allocate method table for this OUI */
+ if ((ret = allocate_method_table(method)))
+ goto error3;
+ memcpy((*vendor_table)->vendor_class[vclass]->oui[i],
+ mad_reg_req->oui, 3);
+ goto check_in_use;
+ }
+ }
+ dev_err(&agent_priv->agent.device->dev, "All OUI slots in use\n");
+ 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 */
+ for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS)
+ (*method)->agent[i] = agent_priv;
+
+ 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 */
+ kfree(method);
+ class->method_table[mgmt_class] = NULL;
+ /* Any management classes left ? */
+ 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,
+ struct ib_mad *mad)
+{
+ struct ib_mad_agent_private *mad_agent = NULL;
+ unsigned long flags;
+
+ spin_lock_irqsave(&port_priv->reg_lock, flags);
+ if (ib_response_mad(mad)) {
+ u32 hi_tid;
+ struct ib_mad_agent_private *entry;
+
+ /*
+ * Routing is based on high 32 bits of transaction ID
+ * of MAD.
+ */
+ hi_tid = be64_to_cpu(mad->mad_hdr.tid) >> 32;
+ list_for_each_entry(entry, &port_priv->agent_list, agent_list) {
+ 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;
+ struct ib_vendor_mad *vendor_mad;
+ int index;
+
+ /*
+ * Routing is based on version, class, and method
+ * For "newer" vendor MADs, also based on OUI
+ */
+ if (mad->mad_hdr.class_version >= MAX_MGMT_VERSION)
+ goto out;
+ if (!is_vendor_class(mad->mad_hdr.mgmt_class)) {
+ class = port_priv->version[
+ mad->mad_hdr.class_version].class;
+ if (!class)
+ goto out;
+ if (convert_mgmt_class(mad->mad_hdr.mgmt_class) >=
+ IB_MGMT_MAX_METHODS)
+ goto out;
+ method = class->method_table[convert_mgmt_class(
+ mad->mad_hdr.mgmt_class)];
+ if (method)
+ mad_agent = method->agent[mad->mad_hdr.method &
+ ~IB_MGMT_METHOD_RESP];
+ } else {
+ vendor = port_priv->version[
+ mad->mad_hdr.class_version].vendor;
+ if (!vendor)
+ goto out;
+ vendor_class = vendor->vendor_class[vendor_class_index(
+ mad->mad_hdr.mgmt_class)];
+ if (!vendor_class)
+ goto out;
+ /* Find matching OUI */
+ vendor_mad = (struct ib_vendor_mad *)mad;
+ index = find_vendor_oui(vendor_class, vendor_mad->oui);
+ if (index == -1)
+ goto out;
+ method = vendor_class->method_table[index];
+ if (method) {
+ mad_agent = method->agent[mad->mad_hdr.method &
+ ~IB_MGMT_METHOD_RESP];
+ }
+ }
+ }
+
+ if (mad_agent) {
+ if (mad_agent->agent.recv_handler)
+ atomic_inc(&mad_agent->refcount);
+ else {
+ dev_notice(&port_priv->device->dev,
+ "No receive handler for client %p on port %d\n",
+ &mad_agent->agent, port_priv->port_num);
+ mad_agent = NULL;
+ }
+ }
+out:
+ spin_unlock_irqrestore(&port_priv->reg_lock, flags);
+
+ return mad_agent;
+}
+
+static int validate_mad(struct ib_mad *mad, u32 qp_num)
+{
+ int valid = 0;
+
+ /* Make sure MAD base version is understood */
+ if (mad->mad_hdr.base_version != IB_MGMT_BASE_VERSION) {
+ pr_err("MAD received with unsupported base version %d\n",
+ mad->mad_hdr.base_version);
+ goto out;
+ }
+
+ /* Filter SMI packets sent to other than QP0 */
+ if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
+ (mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
+ if (qp_num == 0)
+ valid = 1;
+ } else {
+ /* Filter GSI packets sent to QP0 */
+ if (qp_num != 0)
+ valid = 1;
+ }
+
+out:
+ return valid;
+}
+
+static int is_data_mad(struct ib_mad_agent_private *mad_agent_priv,
+ struct ib_mad_hdr *mad_hdr)
+{
+ struct ib_rmpp_mad *rmpp_mad;
+
+ rmpp_mad = (struct ib_rmpp_mad *)mad_hdr;
+ return !mad_agent_priv->agent.rmpp_version ||
+ !ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent) ||
+ !(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
+ IB_MGMT_RMPP_FLAG_ACTIVE) ||
+ (rmpp_mad->rmpp_hdr.rmpp_type == IB_MGMT_RMPP_TYPE_DATA);
+}
+
+static inline int rcv_has_same_class(struct ib_mad_send_wr_private *wr,
+ struct ib_mad_recv_wc *rwc)
+{
+ return ((struct ib_mad *)(wr->send_buf.mad))->mad_hdr.mgmt_class ==
+ rwc->recv_buf.mad->mad_hdr.mgmt_class;
+}
+
+static inline int rcv_has_same_gid(struct ib_mad_agent_private *mad_agent_priv,
+ struct ib_mad_send_wr_private *wr,
+ struct ib_mad_recv_wc *rwc )
+{
+ struct ib_ah_attr attr;
+ u8 send_resp, rcv_resp;
+ union ib_gid sgid;
+ struct ib_device *device = mad_agent_priv->agent.device;
+ u8 port_num = mad_agent_priv->agent.port_num;
+ u8 lmc;
+
+ send_resp = ib_response_mad((struct ib_mad *)wr->send_buf.mad);
+ rcv_resp = ib_response_mad(rwc->recv_buf.mad);
+
+ if (send_resp == rcv_resp)
+ /* both requests, or both responses. GIDs different */
+ return 0;
+
+ if (ib_query_ah(wr->send_buf.ah, &attr))
+ /* Assume not equal, to avoid false positives. */
+ return 0;
+
+ if (!!(attr.ah_flags & IB_AH_GRH) !=
+ !!(rwc->wc->wc_flags & IB_WC_GRH))
+ /* one has GID, other does not. Assume different */
+ return 0;
+
+ if (!send_resp && rcv_resp) {
+ /* is request/response. */
+ if (!(attr.ah_flags & IB_AH_GRH)) {
+ if (ib_get_cached_lmc(device, port_num, &lmc))
+ return 0;
+ return (!lmc || !((attr.src_path_bits ^
+ rwc->wc->dlid_path_bits) &
+ ((1 << lmc) - 1)));
+ } else {
+ if (ib_get_cached_gid(device, port_num,
+ attr.grh.sgid_index, &sgid))
+ return 0;
+ return !memcmp(sgid.raw, rwc->recv_buf.grh->dgid.raw,
+ 16);
+ }
+ }
+
+ if (!(attr.ah_flags & IB_AH_GRH))
+ return attr.dlid == rwc->wc->slid;
+ else
+ return !memcmp(attr.grh.dgid.raw, rwc->recv_buf.grh->sgid.raw,
+ 16);
+}
+
+static inline int is_direct(u8 class)
+{
+ return (class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE);
+}
+
+struct ib_mad_send_wr_private*
+ib_find_send_mad(struct ib_mad_agent_private *mad_agent_priv,
+ struct ib_mad_recv_wc *wc)
+{
+ struct ib_mad_send_wr_private *wr;
+ struct ib_mad *mad;
+
+ mad = (struct ib_mad *)wc->recv_buf.mad;
+
+ list_for_each_entry(wr, &mad_agent_priv->wait_list, agent_list) {
+ if ((wr->tid == mad->mad_hdr.tid) &&
+ rcv_has_same_class(wr, wc) &&
+ /*
+ * Don't check GID for direct routed MADs.
+ * These might have permissive LIDs.
+ */
+ (is_direct(wc->recv_buf.mad->mad_hdr.mgmt_class) ||
+ rcv_has_same_gid(mad_agent_priv, wr, wc)))
+ return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
+ }
+
+ /*
+ * It's possible to receive the response before we've
+ * been notified that the send has completed
+ */
+ list_for_each_entry(wr, &mad_agent_priv->send_list, agent_list) {
+ if (is_data_mad(mad_agent_priv, wr->send_buf.mad) &&
+ wr->tid == mad->mad_hdr.tid &&
+ wr->timeout &&
+ rcv_has_same_class(wr, wc) &&
+ /*
+ * Don't check GID for direct routed MADs.
+ * These might have permissive LIDs.
+ */
+ (is_direct(wc->recv_buf.mad->mad_hdr.mgmt_class) ||
+ rcv_has_same_gid(mad_agent_priv, wr, wc)))
+ /* Verify request has not been canceled */
+ return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
+ }
+ return NULL;
+}
+
+void ib_mark_mad_done(struct ib_mad_send_wr_private *mad_send_wr)
+{
+ mad_send_wr->timeout = 0;
+ if (mad_send_wr->refcount == 1)
+ list_move_tail(&mad_send_wr->agent_list,
+ &mad_send_wr->mad_agent_priv->done_list);
+}
+
+static void ib_mad_complete_recv(struct ib_mad_agent_private *mad_agent_priv,
+ struct ib_mad_recv_wc *mad_recv_wc)
+{
+ struct ib_mad_send_wr_private *mad_send_wr;
+ struct ib_mad_send_wc mad_send_wc;
+ unsigned long flags;
+
+ INIT_LIST_HEAD(&mad_recv_wc->rmpp_list);
+ list_add(&mad_recv_wc->recv_buf.list, &mad_recv_wc->rmpp_list);
+ if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) {
+ mad_recv_wc = ib_process_rmpp_recv_wc(mad_agent_priv,
+ mad_recv_wc);
+ if (!mad_recv_wc) {
+ deref_mad_agent(mad_agent_priv);
+ return;
+ }
+ }
+
+ /* Complete corresponding request */
+ if (ib_response_mad(mad_recv_wc->recv_buf.mad)) {
+ spin_lock_irqsave(&mad_agent_priv->lock, flags);
+ mad_send_wr = ib_find_send_mad(mad_agent_priv, mad_recv_wc);
+ if (!mad_send_wr) {
+ spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
+ 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
+ */
+ mad_recv_wc->wc->wr_id = 0;
+ mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
+ mad_recv_wc);
+ 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);
+
+ /* Defined behavior is to complete response before request */
+ mad_recv_wc->wc->wr_id = (unsigned long) &mad_send_wr->send_buf;
+ mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
+ mad_recv_wc);
+ atomic_dec(&mad_agent_priv->refcount);
+
+ 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);
+ }
+ } else {
+ mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
+ mad_recv_wc);
+ deref_mad_agent(mad_agent_priv);
+ }
+}
+
+static bool generate_unmatched_resp(struct ib_mad_private *recv,
+ struct ib_mad_private *response)
+{
+ if (recv->mad.mad.mad_hdr.method == IB_MGMT_METHOD_GET ||
+ recv->mad.mad.mad_hdr.method == IB_MGMT_METHOD_SET) {
+ memcpy(response, recv, sizeof *response);
+ response->header.recv_wc.wc = &response->header.wc;
+ response->header.recv_wc.recv_buf.mad = &response->mad.mad;
+ response->header.recv_wc.recv_buf.grh = &response->grh;
+ response->mad.mad.mad_hdr.method = IB_MGMT_METHOD_GET_RESP;
+ response->mad.mad.mad_hdr.status =
+ cpu_to_be16(IB_MGMT_MAD_STATUS_UNSUPPORTED_METHOD_ATTRIB);
+ if (recv->mad.mad.mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
+ response->mad.mad.mad_hdr.status |= IB_SMP_DIRECTION;
+
+ return true;
+ } else {
+ return false;
+ }
+}
+static void ib_mad_recv_done_handler(struct ib_mad_port_private *port_priv,
+ struct ib_wc *wc)
+{
+ struct ib_mad_qp_info *qp_info;
+ struct ib_mad_private_header *mad_priv_hdr;
+ struct ib_mad_private *recv, *response = NULL;
+ struct ib_mad_list_head *mad_list;
+ struct ib_mad_agent_private *mad_agent;
+ int port_num;
+ int ret = IB_MAD_RESULT_SUCCESS;
+
+ mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
+ qp_info = mad_list->mad_queue->qp_info;
+ dequeue_mad(mad_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);
+ ib_dma_unmap_single(port_priv->device,
+ recv->header.mapping,
+ sizeof(struct ib_mad_private) -
+ sizeof(struct ib_mad_private_header),
+ DMA_FROM_DEVICE);
+
+ /* Setup MAD receive work completion from "normal" work completion */
+ recv->header.wc = *wc;
+ recv->header.recv_wc.wc = &recv->header.wc;
+ recv->header.recv_wc.mad_len = sizeof(struct ib_mad);
+ recv->header.recv_wc.recv_buf.mad = &recv->mad.mad;
+ 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 */
+ if (!validate_mad(&recv->mad.mad, qp_info->qp->qp_num))
+ goto out;
+
+ response = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL);
+ if (!response) {
+ dev_err(&port_priv->device->dev,
+ "ib_mad_recv_done_handler no memory for response buffer\n");
+ goto out;
+ }
+
+ if (port_priv->device->node_type == RDMA_NODE_IB_SWITCH)
+ port_num = wc->port_num;
+ else
+ port_num = port_priv->port_num;
+
+ if (recv->mad.mad.mad_hdr.mgmt_class ==
+ IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
+ enum smi_forward_action retsmi;
+
+ if (smi_handle_dr_smp_recv(&recv->mad.smp,
+ port_priv->device->node_type,
+ port_num,
+ port_priv->device->phys_port_cnt) ==
+ IB_SMI_DISCARD)
+ goto out;
+
+ retsmi = smi_check_forward_dr_smp(&recv->mad.smp);
+ if (retsmi == IB_SMI_LOCAL)
+ goto local;
+
+ if (retsmi == IB_SMI_SEND) { /* don't forward */
+ if (smi_handle_dr_smp_send(&recv->mad.smp,
+ port_priv->device->node_type,
+ port_num) == IB_SMI_DISCARD)
+ goto out;
+
+ if (smi_check_local_smp(&recv->mad.smp, port_priv->device) == IB_SMI_DISCARD)
+ goto out;
+ } else if (port_priv->device->node_type == RDMA_NODE_IB_SWITCH) {
+ /* forward case for switches */
+ memcpy(response, recv, sizeof(*response));
+ response->header.recv_wc.wc = &response->header.wc;
+ response->header.recv_wc.recv_buf.mad = &response->mad.mad;
+ response->header.recv_wc.recv_buf.grh = &response->grh;
+
+ agent_send_response(&response->mad.mad,
+ &response->grh, wc,
+ port_priv->device,
+ smi_get_fwd_port(&recv->mad.smp),
+ qp_info->qp->qp_num);
+
+ goto out;
+ }
+ }
+
+local:
+ /* 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,
+ &recv->mad.mad,
+ &response->mad.mad);
+ if (ret & IB_MAD_RESULT_SUCCESS) {
+ if (ret & IB_MAD_RESULT_CONSUMED)
+ goto out;
+ if (ret & IB_MAD_RESULT_REPLY) {
+ agent_send_response(&response->mad.mad,
+ &recv->grh, wc,
+ port_priv->device,
+ port_num,
+ qp_info->qp->qp_num);
+ goto out;
+ }
+ }
+ }
+
+ mad_agent = find_mad_agent(port_priv, &recv->mad.mad);
+ if (mad_agent) {
+ ib_mad_complete_recv(mad_agent, &recv->header.recv_wc);
+ /*
+ * recv is freed up in error cases in ib_mad_complete_recv
+ * or via recv_handler in ib_mad_complete_recv()
+ */
+ recv = NULL;
+ } else if ((ret & IB_MAD_RESULT_SUCCESS) &&
+ generate_unmatched_resp(recv, response)) {
+ agent_send_response(&response->mad.mad, &recv->grh, wc,
+ port_priv->device, port_num, qp_info->qp->qp_num);
+ }
+
+out:
+ /* Post another receive request for this QP */
+ if (response) {
+ ib_mad_post_receive_mads(qp_info, response);
+ if (recv)
+ kmem_cache_free(ib_mad_cache, recv);
+ } 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)) {
+ cancel_delayed_work(&mad_agent_priv->timed_work);
+ } 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;
+ mod_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
+ &mad_agent_priv->timed_work, delay);
+ }
+ }
+}
+
+static void wait_for_response(struct ib_mad_send_wr_private *mad_send_wr)
+{
+ struct ib_mad_agent_private *mad_agent_priv;
+ struct ib_mad_send_wr_private *temp_mad_send_wr;
+ struct list_head *list_item;
+ unsigned long delay;
+
+ mad_agent_priv = mad_send_wr->mad_agent_priv;
+ list_del(&mad_send_wr->agent_list);
+
+ delay = mad_send_wr->timeout;
+ mad_send_wr->timeout += jiffies;
+
+ 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;
+ }
+ }
+ else
+ list_item = &mad_agent_priv->wait_list;
+ list_add(&mad_send_wr->agent_list, list_item);
+
+ /* Reschedule a work item if we have a shorter timeout */
+ 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);
+}
+
+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);
+}
+
+/*
+ * Process a send work completion
+ */
+void ib_mad_complete_send_wr(struct ib_mad_send_wr_private *mad_send_wr,
+ struct ib_mad_send_wc *mad_send_wc)
+{
+ struct ib_mad_agent_private *mad_agent_priv;
+ unsigned long flags;
+ int ret;
+
+ mad_agent_priv = mad_send_wr->mad_agent_priv;
+ spin_lock_irqsave(&mad_agent_priv->lock, flags);
+ if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) {
+ 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;
+
+ 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) {
+ wait_for_response(mad_send_wr);
+ }
+ goto done;
+ }
+
+ /* 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;
+ if (ret == IB_RMPP_RESULT_INTERNAL)
+ ib_rmpp_send_handler(mad_send_wc);
+ else
+ mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
+ mad_send_wc);
+
+ /* Release reference on agent taken when sending */
+ deref_mad_agent(mad_agent_priv);
+ return;
+done:
+ spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
+}
+
+static void ib_mad_send_done_handler(struct ib_mad_port_private *port_priv,
+ struct ib_wc *wc)
+{
+ struct ib_mad_send_wr_private *mad_send_wr, *queued_send_wr;
+ struct ib_mad_list_head *mad_list;
+ struct ib_mad_qp_info *qp_info;
+ struct ib_mad_queue *send_queue;
+ struct ib_send_wr *bad_send_wr;
+ struct ib_mad_send_wc mad_send_wc;
+ unsigned long flags;
+ int ret;
+
+ mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
+ 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:
+ 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);
+ 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);
+ list_move_tail(&mad_list->list, &send_queue->list);
+ }
+ spin_unlock_irqrestore(&send_queue->lock, flags);
+
+ mad_send_wc.send_buf = &mad_send_wr->send_buf;
+ mad_send_wc.status = wc->status;
+ mad_send_wc.vendor_err = wc->vendor_err;
+ if (atomic_read(&qp_info->snoop_count))
+ snoop_send(qp_info, &mad_send_wr->send_buf, &mad_send_wc,
+ IB_MAD_SNOOP_SEND_COMPLETIONS);
+ ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
+
+ if (queued_send_wr) {
+ ret = ib_post_send(qp_info->qp, &queued_send_wr->send_wr,
+ &bad_send_wr);
+ if (ret) {
+ dev_err(&port_priv->device->dev,
+ "ib_post_send failed: %d\n", ret);
+ 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);
+}
+
+static void mad_error_handler(struct ib_mad_port_private *port_priv,
+ struct ib_wc *wc)
+{
+ struct ib_mad_list_head *mad_list;
+ struct ib_mad_qp_info *qp_info;
+ struct ib_mad_send_wr_private *mad_send_wr;
+ int ret;
+
+ /* Determine if failure was a send or receive */
+ mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
+ qp_info = mad_list->mad_queue->qp_info;
+ if (mad_list->mad_queue == &qp_info->recv_queue)
+ /*
+ * Receive errors indicate that the QP has entered the error
+ * state - error handling/shutdown code will cleanup
+ */
+ return;
+
+ /*
+ * 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;
+ ret = ib_post_send(qp_info->qp, &mad_send_wr->send_wr,
+ &bad_send_wr);
+ if (ret)
+ ib_mad_send_done_handler(port_priv, wc);
+ } else
+ ib_mad_send_done_handler(port_priv, wc);
+ } 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)
+ dev_err(&port_priv->device->dev,
+ "mad_error_handler - ib_modify_qp to RTS : %d\n",
+ ret);
+ else
+ mark_sends_for_retry(qp_info);
+ }
+ ib_mad_send_done_handler(port_priv, wc);
+ }
+}
+
+/*
+ * IB MAD completion callback
+ */
+static void ib_mad_completion_handler(struct work_struct *work)
+{
+ struct ib_mad_port_private *port_priv;
+ struct ib_wc wc;
+
+ port_priv = container_of(work, struct ib_mad_port_private, work);
+ ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
+
+ while (ib_poll_cq(port_priv->cq, 1, &wc) == 1) {
+ if (wc.status == IB_WC_SUCCESS) {
+ switch (wc.opcode) {
+ case IB_WC_SEND:
+ ib_mad_send_done_handler(port_priv, &wc);
+ break;
+ case IB_WC_RECV:
+ ib_mad_recv_done_handler(port_priv, &wc);
+ break;
+ default:
+ BUG_ON(1);
+ break;
+ }
+ } else
+ mad_error_handler(port_priv, &wc);
+ }
+}
+
+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) {
+ mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
+ 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) {
+ mad_send_wc.send_buf = &mad_send_wr->send_buf;
+ list_del(&mad_send_wr->agent_list);
+ 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*
+find_send_wr(struct ib_mad_agent_private *mad_agent_priv,
+ struct ib_mad_send_buf *send_buf)
+{
+ struct ib_mad_send_wr_private *mad_send_wr;
+
+ list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list,
+ agent_list) {
+ if (&mad_send_wr->send_buf == send_buf)
+ return mad_send_wr;
+ }
+
+ list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list,
+ agent_list) {
+ if (is_data_mad(mad_agent_priv, mad_send_wr->send_buf.mad) &&
+ &mad_send_wr->send_buf == send_buf)
+ return mad_send_wr;
+ }
+ return NULL;
+}
+
+int ib_modify_mad(struct ib_mad_agent *mad_agent,
+ struct ib_mad_send_buf *send_buf, u32 timeout_ms)
+{
+ struct ib_mad_agent_private *mad_agent_priv;
+ struct ib_mad_send_wr_private *mad_send_wr;
+ unsigned long flags;
+ int active;
+
+ mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
+ agent);
+ spin_lock_irqsave(&mad_agent_priv->lock, flags);
+ mad_send_wr = find_send_wr(mad_agent_priv, send_buf);
+ if (!mad_send_wr || mad_send_wr->status != IB_WC_SUCCESS) {
+ spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
+ return -EINVAL;
+ }
+
+ active = (!mad_send_wr->timeout || mad_send_wr->refcount > 1);
+ if (!timeout_ms) {
+ mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
+ mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
+ }
+
+ mad_send_wr->send_buf.timeout_ms = timeout_ms;
+ if (active)
+ mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
+ else
+ ib_reset_mad_timeout(mad_send_wr, timeout_ms);
+
+ spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
+ return 0;
+}
+EXPORT_SYMBOL(ib_modify_mad);
+
+void ib_cancel_mad(struct ib_mad_agent *mad_agent,
+ struct ib_mad_send_buf *send_buf)
+{
+ ib_modify_mad(mad_agent, send_buf, 0);
+}
+EXPORT_SYMBOL(ib_cancel_mad);
+
+static void local_completions(struct work_struct *work)
+{
+ 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;
+ int free_mad;
+ struct ib_wc wc;
+ struct ib_mad_send_wc mad_send_wc;
+
+ mad_agent_priv =
+ container_of(work, struct ib_mad_agent_private, local_work);
+
+ 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);
+ list_del(&local->completion_list);
+ spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
+ free_mad = 0;
+ if (local->mad_priv) {
+ recv_mad_agent = local->recv_mad_agent;
+ if (!recv_mad_agent) {
+ dev_err(&mad_agent_priv->agent.device->dev,
+ "No receive MAD agent for local completion\n");
+ free_mad = 1;
+ goto local_send_completion;
+ }
+
+ /*
+ * Defined behavior is to complete response
+ * before request
+ */
+ build_smp_wc(recv_mad_agent->agent.qp,
+ (unsigned long) local->mad_send_wr,
+ be16_to_cpu(IB_LID_PERMISSIVE),
+ 0, recv_mad_agent->agent.port_num, &wc);
+
+ local->mad_priv->header.recv_wc.wc = &wc;
+ local->mad_priv->header.recv_wc.mad_len =
+ sizeof(struct ib_mad);
+ 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);
+ local->mad_priv->header.recv_wc.recv_buf.grh = NULL;
+ local->mad_priv->header.recv_wc.recv_buf.mad =
+ &local->mad_priv->mad.mad;
+ 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,
+ &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;
+ mad_send_wc.send_buf = &local->mad_send_wr->send_buf;
+ if (atomic_read(&mad_agent_priv->qp_info->snoop_count))
+ snoop_send(mad_agent_priv->qp_info,
+ &local->mad_send_wr->send_buf,
+ &mad_send_wc, IB_MAD_SNOOP_SEND_COMPLETIONS);
+ 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);
+ if (free_mad)
+ kmem_cache_free(ib_mad_cache, local->mad_priv);
+ kfree(local);
+ }
+ spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
+}
+
+static int retry_send(struct ib_mad_send_wr_private *mad_send_wr)
+{
+ int ret;
+
+ if (!mad_send_wr->retries_left)
+ return -ETIMEDOUT;
+
+ mad_send_wr->retries_left--;
+ mad_send_wr->send_buf.retries++;
+
+ mad_send_wr->timeout = msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms);
+
+ if (ib_mad_kernel_rmpp_agent(&mad_send_wr->mad_agent_priv->agent)) {
+ 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);
+
+ if (!ret) {
+ mad_send_wr->refcount++;
+ list_add_tail(&mad_send_wr->agent_list,
+ &mad_send_wr->mad_agent_priv->send_list);
+ }
+ return ret;
+}
+
+static void timeout_sends(struct work_struct *work)
+{
+ 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;
+
+ mad_agent_priv = container_of(work, struct ib_mad_agent_private,
+ timed_work.work);
+ 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;
+ }
+
+ list_del(&mad_send_wr->agent_list);
+ if (mad_send_wr->status == IB_WC_SUCCESS &&
+ !retry_send(mad_send_wr))
+ continue;
+
+ spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
+
+ 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;
+ mad_send_wc.send_buf = &mad_send_wr->send_buf;
+ 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);
+}
+
+static void ib_mad_thread_completion_handler(struct ib_cq *cq, void *arg)
+{
+ struct ib_mad_port_private *port_priv = cq->cq_context;
+ unsigned long flags;
+
+ spin_lock_irqsave(&ib_mad_port_list_lock, flags);
+ if (!list_empty(&port_priv->port_list))
+ queue_work(port_priv->wq, &port_priv->work);
+ spin_unlock_irqrestore(&ib_mad_port_list_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 */
+ sg_list.length = sizeof *mad_priv - sizeof mad_priv->header;
+ sg_list.lkey = (*qp_info->port_priv->mr).lkey;
+
+ /* 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 {
+ mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL);
+ if (!mad_priv) {
+ dev_err(&qp_info->port_priv->device->dev,
+ "No memory for receive buffer\n");
+ ret = -ENOMEM;
+ break;
+ }
+ }
+ sg_list.addr = ib_dma_map_single(qp_info->port_priv->device,
+ &mad_priv->grh,
+ sizeof *mad_priv -
+ sizeof mad_priv->header,
+ DMA_FROM_DEVICE);
+ if (unlikely(ib_dma_mapping_error(qp_info->port_priv->device,
+ sg_list.addr))) {
+ ret = -ENOMEM;
+ break;
+ }
+ mad_priv->header.mapping = sg_list.addr;
+ recv_wr.wr_id = (unsigned long)&mad_priv->header.mad_list;
+ mad_priv->header.mad_list.mad_queue = recv_queue;
+
+ /* 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);
+ ib_dma_unmap_single(qp_info->port_priv->device,
+ mad_priv->header.mapping,
+ sizeof *mad_priv -
+ sizeof mad_priv->header,
+ DMA_FROM_DEVICE);
+ kmem_cache_free(ib_mad_cache, mad_priv);
+ dev_err(&qp_info->port_priv->device->dev,
+ "ib_post_recv failed: %d\n", ret);
+ 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;
+
+ if (!qp_info->qp)
+ return;
+
+ 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);
+
+ ib_dma_unmap_single(qp_info->port_priv->device,
+ recv->header.mapping,
+ sizeof(struct ib_mad_private) -
+ sizeof(struct ib_mad_private_header),
+ DMA_FROM_DEVICE);
+ kmem_cache_free(ib_mad_cache, recv);
+ }
+
+ 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;
+ u16 pkey_index;
+
+ attr = kmalloc(sizeof *attr, GFP_KERNEL);
+ if (!attr) {
+ dev_err(&port_priv->device->dev,
+ "Couldn't kmalloc ib_qp_attr\n");
+ return -ENOMEM;
+ }
+
+ ret = ib_find_pkey(port_priv->device, port_priv->port_num,
+ IB_DEFAULT_PKEY_FULL, &pkey_index);
+ if (ret)
+ pkey_index = 0;
+
+ for (i = 0; i < IB_MAD_QPS_CORE; i++) {
+ qp = port_priv->qp_info[i].qp;
+ if (!qp)
+ continue;
+
+ /*
+ * PKey index for QP1 is irrelevant but
+ * one is needed for the Reset to Init transition
+ */
+ attr->qp_state = IB_QPS_INIT;
+ attr->pkey_index = pkey_index;
+ 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) {
+ dev_err(&port_priv->device->dev,
+ "Couldn't change QP%d state to INIT: %d\n",
+ i, ret);
+ goto out;
+ }
+
+ attr->qp_state = IB_QPS_RTR;
+ ret = ib_modify_qp(qp, attr, IB_QP_STATE);
+ if (ret) {
+ dev_err(&port_priv->device->dev,
+ "Couldn't change QP%d state to RTR: %d\n",
+ i, ret);
+ 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) {
+ dev_err(&port_priv->device->dev,
+ "Couldn't change QP%d state to RTS: %d\n",
+ i, ret);
+ goto out;
+ }
+ }
+
+ ret = ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
+ if (ret) {
+ dev_err(&port_priv->device->dev,
+ "Failed to request completion notification: %d\n",
+ ret);
+ goto out;
+ }
+
+ for (i = 0; i < IB_MAD_QPS_CORE; i++) {
+ if (!port_priv->qp_info[i].qp)
+ continue;
+
+ ret = ib_mad_post_receive_mads(&port_priv->qp_info[i], NULL);
+ if (ret) {
+ dev_err(&port_priv->device->dev,
+ "Couldn't post receive WRs\n");
+ 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! */
+ dev_err(&qp_info->port_priv->device->dev,
+ "Fatal error (%d) on MAD QP (%d)\n",
+ 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;
+ qp_init_attr.cap.max_send_wr = mad_sendq_size;
+ qp_init_attr.cap.max_recv_wr = mad_recvq_size;
+ 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)) {
+ dev_err(&qp_info->port_priv->device->dev,
+ "Couldn't create ib_mad QP%d\n",
+ get_spl_qp_index(qp_type));
+ ret = PTR_ERR(qp_info->qp);
+ goto error;
+ }
+ /* Use minimum queue sizes unless the CQ is resized */
+ qp_info->send_queue.max_active = mad_sendq_size;
+ qp_info->recv_queue.max_active = mad_recvq_size;
+ return 0;
+
+error:
+ return ret;
+}
+
+static void destroy_mad_qp(struct ib_mad_qp_info *qp_info)
+{
+ if (!qp_info->qp)
+ return;
+
+ ib_destroy_qp(qp_info->qp);
+ kfree(qp_info->snoop_table);
+}
+
+/*
+ * 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"];
+ int has_smi;
+
+ /* Create new device info */
+ port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL);
+ if (!port_priv) {
+ dev_err(&device->dev, "No memory for ib_mad_port_private\n");
+ return -ENOMEM;
+ }
+
+ 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]);
+
+ cq_size = mad_sendq_size + mad_recvq_size;
+ has_smi = rdma_port_get_link_layer(device, port_num) == IB_LINK_LAYER_INFINIBAND;
+ if (has_smi)
+ cq_size *= 2;
+
+ port_priv->cq = ib_create_cq(port_priv->device,
+ ib_mad_thread_completion_handler,
+ NULL, port_priv, cq_size, 0);
+ if (IS_ERR(port_priv->cq)) {
+ dev_err(&device->dev, "Couldn't create ib_mad CQ\n");
+ ret = PTR_ERR(port_priv->cq);
+ goto error3;
+ }
+
+ port_priv->pd = ib_alloc_pd(device);
+ if (IS_ERR(port_priv->pd)) {
+ dev_err(&device->dev, "Couldn't create ib_mad PD\n");
+ ret = PTR_ERR(port_priv->pd);
+ goto error4;
+ }
+
+ port_priv->mr = ib_get_dma_mr(port_priv->pd, IB_ACCESS_LOCAL_WRITE);
+ if (IS_ERR(port_priv->mr)) {
+ dev_err(&device->dev, "Couldn't get ib_mad DMA MR\n");
+ ret = PTR_ERR(port_priv->mr);
+ goto error5;
+ }
+
+ if (has_smi) {
+ ret = create_mad_qp(&port_priv->qp_info[0], IB_QPT_SMI);
+ if (ret)
+ goto error6;
+ }
+ 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);
+ port_priv->wq = create_singlethread_workqueue(name);
+ if (!port_priv->wq) {
+ ret = -ENOMEM;
+ goto error8;
+ }
+ INIT_WORK(&port_priv->work, ib_mad_completion_handler);
+
+ 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);
+
+ ret = ib_mad_port_start(port_priv);
+ if (ret) {
+ dev_err(&device->dev, "Couldn't start port\n");
+ goto error9;
+ }
+
+ return 0;
+
+error9:
+ 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);
+
+ 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_dereg_mr(port_priv->mr);
+error5:
+ ib_dealloc_pd(port_priv->pd);
+error4:
+ ib_destroy_cq(port_priv->cq);
+ 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);
+ dev_err(&device->dev, "Port %d not found\n", port_num);
+ return -ENODEV;
+ }
+ list_del_init(&port_priv->port_list);
+ 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_dereg_mr(port_priv->mr);
+ ib_dealloc_pd(port_priv->pd);
+ ib_destroy_cq(port_priv->cq);
+ 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)
+{
+ int start, end, i;
+
+ if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
+ return;
+
+ if (device->node_type == RDMA_NODE_IB_SWITCH) {
+ start = 0;
+ end = 0;
+ } else {
+ start = 1;
+ end = device->phys_port_cnt;
+ }
+
+ for (i = start; i <= end; i++) {
+ if (ib_mad_port_open(device, i)) {
+ dev_err(&device->dev, "Couldn't open port %d\n", i);
+ goto error;
+ }
+ if (ib_agent_port_open(device, i)) {
+ dev_err(&device->dev,
+ "Couldn't open port %d for agents\n", i);
+ goto error_agent;
+ }
+ }
+ return;
+
+error_agent:
+ if (ib_mad_port_close(device, i))
+ dev_err(&device->dev, "Couldn't close port %d\n", i);
+
+error:
+ i--;
+
+ while (i >= start) {
+ if (ib_agent_port_close(device, i))
+ dev_err(&device->dev,
+ "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);
+ i--;
+ }
+}
+
+static void ib_mad_remove_device(struct ib_device *device)
+{
+ int i, num_ports, cur_port;
+
+ if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
+ return;
+
+ if (device->node_type == RDMA_NODE_IB_SWITCH) {
+ num_ports = 1;
+ cur_port = 0;
+ } else {
+ num_ports = device->phys_port_cnt;
+ cur_port = 1;
+ }
+ for (i = 0; i < num_ports; i++, cur_port++) {
+ if (ib_agent_port_close(device, cur_port))
+ dev_err(&device->dev,
+ "Couldn't close port %d for agents\n",
+ cur_port);
+ if (ib_mad_port_close(device, cur_port))
+ dev_err(&device->dev, "Couldn't close port %d\n",
+ cur_port);
+ }
+}
+
+static struct ib_client mad_client = {
+ .name = "mad",
+ .add = ib_mad_init_device,
+ .remove = ib_mad_remove_device
+};
+
+static int __init ib_mad_init_module(void)
+{
+ int ret;
+
+ 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);
+
+ ib_mad_cache = kmem_cache_create("ib_mad",
+ sizeof(struct ib_mad_private),
+ 0,
+ SLAB_HWCACHE_ALIGN,
+ NULL);
+ if (!ib_mad_cache) {
+ pr_err("Couldn't create ib_mad cache\n");
+ ret = -ENOMEM;
+ goto error1;
+ }
+
+ INIT_LIST_HEAD(&ib_mad_port_list);
+
+ if (ib_register_client(&mad_client)) {
+ pr_err("Couldn't register ib_mad client\n");
+ ret = -EINVAL;
+ goto error2;
+ }
+
+ return 0;
+
+error2:
+ kmem_cache_destroy(ib_mad_cache);
+error1:
+ return ret;
+}
+
+static void __exit ib_mad_cleanup_module(void)
+{
+ ib_unregister_client(&mad_client);
+ kmem_cache_destroy(ib_mad_cache);
+}
+
+module_init(ib_mad_init_module);
+module_exit(ib_mad_cleanup_module);
Code Review / kvmfornfv.git / blobdiff