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linux_dsm_epyc7002/drivers/infiniband/core/mad.c
Haggai Eran 7c1eb45a22 IB/core: lock client data with lists_rwsem 
An ib_client callback that is called with the lists_rwsem locked only for
read is protected from changes to the IB client lists, but not from
ib_unregister_device() freeing its client data. This is because
ib_unregister_device() will remove the device from the device list with
lists_rwsem locked for write, but perform the rest of the cleanup,
including the call to remove() without that lock.

Mark client data that is undergoing de-registration with a new going_down
flag in the client data context. Lock the client data list with lists_rwsem
for write in addition to using the spinlock, so that functions calling the
callback would be able to lock only lists_rwsem for read and let callbacks
sleep.

Since ib_unregister_client() now marks the client data context, no need for
remove() to search the context again, so pass the client data directly to
remove() callbacks.

Reviewed-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Signed-off-by: Haggai Eran <haggaie@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
2015-08-30 15:48:21 -04:00

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/*
* 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.
* Copyright (c) 2014 Intel Corporation. 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 "opa_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 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,
const struct ib_mad_hdr *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(const struct ib_mad_hdr *hdr)
{
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)));
}
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;
}
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;
}
/*
* 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;
struct opa_smp *opa_smp = (struct opa_smp *)smp;
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;
size_t mad_size = port_mad_size(mad_agent_priv->qp_info->port_priv);
u16 out_mad_pkey_index = 0;
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);
if (rdma_cap_ib_switch(device) &&
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 (opa && smp->class_version == OPA_SMP_CLASS_VERSION) {
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 &&
opa_smi_handle_dr_smp_send(opa_smp,
rdma_cap_ib_switch(device),
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);
if (opa_drslid != be32_to_cpu(OPA_LID_PERMISSIVE) &&
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);
/* 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 &&
smi_handle_dr_smp_send(smp, rdma_cap_ib_switch(device), port_num) ==
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;
}
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 = alloc_mad_private(mad_size, 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, drslid,
send_wr->wr.ud.pkey_index,
send_wr->wr.ud.port_num, &mad_wc);
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);
}
/* No GRH for DR SMP */
ret = device->process_mad(device, 0, port_num, &mad_wc, NULL,
(const struct ib_mad_hdr *)smp, mad_size,
(struct ib_mad_hdr *)mad_priv->mad,
&mad_size, &out_mad_pkey_index);
switch (ret)
{
case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY:
if (ib_response_mad((const struct ib_mad_hdr *)mad_priv->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
kfree(mad_priv);
break;
case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED:
kfree(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, smp, mad_priv->mad_size);
recv_mad_agent = find_mad_agent(port_priv,
(const struct ib_mad_hdr *)mad_priv->mad);
}
if (!port_priv || !recv_mad_agent) {
/*
* No receiving agent so drop packet and
* generate send completion.
*/
kfree(mad_priv);
break;
}
local->mad_priv = mad_priv;
local->recv_mad_agent = recv_mad_agent;
break;
default:
kfree(mad_priv);
kfree(local);
ret = -EINVAL;
goto out;
}
local->mad_send_wr = mad_send_wr;
if (opa) {
local->mad_send_wr->send_wr.wr.ud.pkey_index = out_mad_pkey_index;
local->return_wc_byte_len = mad_size;
}
/* 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, size_t mad_size)
{
int seg_size, pad;
seg_size = mad_size - 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,
size_t mad_size, 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 = mad_size - send_buf->hdr_len;
send_buf->seg_rmpp_size = mad_size - IB_MGMT_RMPP_HDR;
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(const 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,
u8 base_version)
{
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;
size_t mad_size;
bool opa;
mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
agent);
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);
message_size = hdr_len + data_len + pad;
if (ib_mad_kernel_rmpp_agent(mad_agent)) {
if (!rmpp_active && message_size > mad_size)
return ERR_PTR(-EINVAL);
} else
if (rmpp_active || message_size > mad_size)
return ERR_PTR(-EINVAL);
size = rmpp_active ? hdr_len : mad_size;
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;
/* 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;
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, mad_size, 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);
kfree(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,
const 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,
const struct ib_mad_hdr *mad_hdr)
{
struct ib_mad_agent_private *mad_agent = NULL;
unsigned long flags;
spin_lock_irqsave(&port_priv->reg_lock, flags);
if (ib_response_mad(mad_hdr)) {
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_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;
const 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_hdr->class_version >= MAX_MGMT_VERSION)
goto out;
if (!is_vendor_class(mad_hdr->mgmt_class)) {
class = port_priv->version[
mad_hdr->class_version].class;
if (!class)
goto out;
if (convert_mgmt_class(mad_hdr->mgmt_class) >=
IB_MGMT_MAX_METHODS)
goto out;
method = class->method_table[convert_mgmt_class(
mad_hdr->mgmt_class)];
if (method)
mad_agent = method->agent[mad_hdr->method &
~IB_MGMT_METHOD_RESP];
} else {
vendor = port_priv->version[
mad_hdr->class_version].vendor;
if (!vendor)
goto out;
vendor_class = vendor->vendor_class[vendor_class_index(
mad_hdr->mgmt_class)];
if (!vendor_class)
goto out;
/* Find matching OUI */
vendor_mad = (const struct ib_vendor_mad *)mad_hdr;
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_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(const struct ib_mad_hdr *mad_hdr,
const struct ib_mad_qp_info *qp_info,
bool opa)
{
int valid = 0;
u32 qp_num = qp_info->qp->qp_num;
/* Make sure MAD base version is understood */
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)" : "");
goto out;
}
/* Filter SMI packets sent to other than QP0 */
if ((mad_hdr->mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
(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_rmpp_data_mad(const struct ib_mad_agent_private *mad_agent_priv,
const 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(const struct ib_mad_send_wr_private *wr,
const struct ib_mad_recv_wc *rwc)
{
return ((struct ib_mad_hdr *)(wr->send_buf.mad))->mgmt_class ==
rwc->recv_buf.mad->mad_hdr.mgmt_class;
}
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 )
{
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_hdr *)wr->send_buf.mad);
rcv_resp = ib_response_mad(&rwc->recv_buf.mad->mad_hdr);
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(const struct ib_mad_agent_private *mad_agent_priv,
const struct ib_mad_recv_wc *wc)
{
struct ib_mad_send_wr_private *wr;
const struct ib_mad_hdr *mad_hdr;
mad_hdr = &wc->recv_buf.mad->mad_hdr;
list_for_each_entry(wr, &mad_agent_priv->wait_list, agent_list) {
if ((wr->tid == mad_hdr->tid) &&
rcv_has_same_class(wr, wc) &&
/*
* Don't check GID for direct routed MADs.
* These might have permissive LIDs.
*/
(is_direct(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_rmpp_data_mad(mad_agent_priv, wr->send_buf.mad) &&
wr->tid == 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(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->mad_hdr)) {
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 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;
struct ib_smp *smp = (struct ib_smp *)recv->mad;
if (smi_handle_dr_smp_recv(smp,
rdma_cap_ib_switch(port_priv->device),
port_num,
port_priv->device->phys_port_cnt) ==
IB_SMI_DISCARD)
return IB_SMI_DISCARD;
retsmi = smi_check_forward_dr_smp(smp);
if (retsmi == IB_SMI_LOCAL)
return IB_SMI_HANDLE;
if (retsmi == IB_SMI_SEND) { /* don't forward */
if (smi_handle_dr_smp_send(smp,
rdma_cap_ib_switch(port_priv->device),
port_num) == IB_SMI_DISCARD)
return IB_SMI_DISCARD;
if (smi_check_local_smp(smp, port_priv->device) == IB_SMI_DISCARD)
return IB_SMI_DISCARD;
} else if (rdma_cap_ib_switch(port_priv->device)) {
/* 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.mad = (struct ib_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,
smi_get_fwd_port(smp),
qp_info->qp->qp_num,
response->mad_size,
false);
return IB_SMI_DISCARD;
}
return IB_SMI_HANDLE;
}
static bool generate_unmatched_resp(const struct ib_mad_private *recv,
struct ib_mad_private *response,
size_t *resp_len, bool opa)
{
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));
response->header.recv_wc.wc = &response->header.wc;
response->header.recv_wc.recv_buf.mad = (struct ib_mad *)response->mad;
response->header.recv_wc.recv_buf.grh = &response->grh;
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;
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);
}
return true;
} else {
return false;
}
}
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,
rdma_cap_ib_switch(port_priv->device),
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,
rdma_cap_ib_switch(port_priv->device),
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;
} else if (rdma_cap_ib_switch(port_priv->device)) {
/* 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 &&
mad_hdr->class_version == OPA_SMI_CLASS_VERSION)
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);
}
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;
size_t mad_size;
u16 resp_mad_pkey_index = 0;
bool opa;
mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
qp_info = mad_list->mad_queue->qp_info;
dequeue_mad(mad_list);
opa = rdma_cap_opa_mad(qp_info->port_priv->device,
qp_info->port_priv->port_num);
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,
mad_priv_dma_size(recv),
DMA_FROM_DEVICE);
/* Setup MAD receive work completion from "normal" work completion */
recv->header.wc = *wc;
recv->header.recv_wc.wc = &recv->header.wc;
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);
}
recv->header.recv_wc.recv_buf.mad = (struct ib_mad *)recv->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((const struct ib_mad_hdr *)recv->mad, qp_info, opa))
goto out;
mad_size = recv->mad_size;
response = alloc_mad_private(mad_size, GFP_KERNEL);
if (!response) {
dev_err(&port_priv->device->dev,
"ib_mad_recv_done_handler no memory for response buffer\n");
goto out;
}
if (rdma_cap_ib_switch(port_priv->device))
port_num = wc->port_num;
else
port_num = port_priv->port_num;
if (((struct ib_mad_hdr *)recv->mad)->mgmt_class ==
IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
if (handle_smi(port_priv, qp_info, wc, port_num, recv,
response, opa)
== IB_SMI_DISCARD)
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,
(const struct ib_mad_hdr *)recv->mad,
recv->mad_size,
(struct ib_mad_hdr *)response->mad,
&mad_size, &resp_mad_pkey_index);
if (opa)
wc->pkey_index = resp_mad_pkey_index;
if (ret & IB_MAD_RESULT_SUCCESS) {
if (ret & IB_MAD_RESULT_CONSUMED)
goto out;
if (ret & IB_MAD_RESULT_REPLY) {
agent_send_response((const struct ib_mad_hdr *)response->mad,
&recv->grh, wc,
port_priv->device,
port_num,
qp_info->qp->qp_num,
mad_size, opa);
goto out;
}
}
}
mad_agent = find_mad_agent(port_priv, (const struct ib_mad_hdr *)recv->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, &mad_size, opa)) {
agent_send_response((const struct ib_mad_hdr *)response->mad, &recv->grh, wc,
port_priv->device, port_num,
qp_info->qp->qp_num, mad_size, opa);
}
out:
/* Post another receive request for this QP */
if (response) {
ib_mad_post_receive_mads(qp_info, response);
kfree(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_rmpp_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;
bool opa;
mad_agent_priv =
container_of(work, struct ib_mad_agent_private, local_work);
opa = rdma_cap_opa_mad(mad_agent_priv->qp_info->port_priv->device,
mad_agent_priv->qp_info->port_priv->port_num);
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) {
u8 base_version;
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),
local->mad_send_wr->send_wr.wr.ud.pkey_index,
recv_mad_agent->agent.port_num, &wc);
local->mad_priv->header.recv_wc.wc = &wc;
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);
}
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 =
(struct ib_mad *)local->mad_priv->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)
kfree(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.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 = alloc_mad_private(port_mad_size(qp_info->port_priv),
GFP_ATOMIC);
if (!mad_priv) {
dev_err(&qp_info->port_priv->device->dev,
"No memory for receive buffer\n");
ret = -ENOMEM;
break;
}
}
sg_list.length = mad_priv_dma_size(mad_priv);
sg_list.addr = ib_dma_map_single(qp_info->port_priv->device,
&mad_priv->grh,
mad_priv_dma_size(mad_priv),
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,
mad_priv_dma_size(mad_priv),
DMA_FROM_DEVICE);
kfree(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,
mad_priv_dma_size(recv),
DMA_FROM_DEVICE);
kfree(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;
struct ib_cq_init_attr cq_attr = {};
if (WARN_ON(rdma_max_mad_size(device, port_num) < IB_MGMT_MAD_SIZE))
return -EFAULT;
if (WARN_ON(rdma_cap_opa_mad(device, port_num) &&
rdma_max_mad_size(device, port_num) < OPA_MGMT_MAD_SIZE))
return -EFAULT;
/* 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_cap_ib_smi(device, port_num);
if (has_smi)
cq_size *= 2;
cq_attr.cqe = cq_size;
port_priv->cq = ib_create_cq(port_priv->device,
ib_mad_thread_completion_handler,
NULL, port_priv, &cq_attr);
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, i;
start = rdma_start_port(device);
for (i = start; i <= rdma_end_port(device); i++) {
if (!rdma_cap_ib_mad(device, i))
continue;
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:
while (--i >= start) {
if (!rdma_cap_ib_mad(device, i))
continue;
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);
}
}
static void ib_mad_remove_device(struct ib_device *device, void *client_data)
{
int i;
for (i = rdma_start_port(device); i <= rdma_end_port(device); i++) {
if (!rdma_cap_ib_mad(device, i))
continue;
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);
}
}
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)
{
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);
INIT_LIST_HEAD(&ib_mad_port_list);
if (ib_register_client(&mad_client)) {
pr_err("Couldn't register ib_mad client\n");
return -EINVAL;
}
return 0;
}
static void __exit ib_mad_cleanup_module(void)
{
ib_unregister_client(&mad_client);
}
module_init(ib_mad_init_module);
module_exit(ib_mad_cleanup_module);
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