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/*
* Copyright (c) 2006 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.
*/
#include <linux/completion.h>
#include <linux/dma-mapping.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/bitops.h>
#include <linux/random.h>
#include "sa.h"
MODULE_AUTHOR("Sean Hefty");
MODULE_DESCRIPTION("InfiniBand InformInfo & Notice event handling");
MODULE_LICENSE("Dual BSD/GPL");
static void inform_add_one(struct ib_device *device);
static void inform_remove_one(struct ib_device *device);
static struct ib_client inform_client = {
.name = "ib_notice",
.add = inform_add_one,
.remove = inform_remove_one
};
static struct ib_sa_client sa_client;
static struct workqueue_struct *inform_wq;
struct inform_device;
struct inform_port {
struct inform_device *dev;
spinlock_t lock;
struct rb_root table;
atomic_t refcount;
struct completion comp;
u8 port_num;
};
struct inform_device {
struct ib_device *device;
struct ib_event_handler event_handler;
int start_port;
int end_port;
struct inform_port port[0];
};
enum inform_state {
INFORM_IDLE,
INFORM_REGISTERING,
INFORM_MEMBER,
INFORM_BUSY,
INFORM_ERROR
};
struct inform_member;
struct inform_group {
u16 trap_number;
struct rb_node node;
struct inform_port *port;
spinlock_t lock;
struct work_struct work;
struct list_head pending_list;
struct list_head active_list;
struct list_head notice_list;
struct inform_member *last_join;
int members;
enum inform_state join_state; /* State relative to SA */
atomic_t refcount;
enum inform_state state;
struct ib_sa_query *query;
int query_id;
};
struct inform_member {
struct ib_inform_info info;
struct ib_sa_client *client;
struct inform_group *group;
struct list_head list;
enum inform_state state;
atomic_t refcount;
struct completion comp;
};
struct inform_notice {
struct list_head list;
struct ib_sa_notice notice;
};
static void reg_handler(int status, struct ib_sa_inform *inform,
void *context);
static void unreg_handler(int status, struct ib_sa_inform *inform,
void *context);
static struct inform_group *inform_find(struct inform_port *port,
u16 trap_number)
{
struct rb_node *node = port->table.rb_node;
struct inform_group *group;
while (node) {
group = rb_entry(node, struct inform_group, node);
if (trap_number < group->trap_number)
node = node->rb_left;
else if (trap_number > group->trap_number)
node = node->rb_right;
else
return group;
}
return NULL;
}
static struct inform_group *inform_insert(struct inform_port *port,
struct inform_group *group)
{
struct rb_node **link = &port->table.rb_node;
struct rb_node *parent = NULL;
struct inform_group *cur_group;
while (*link) {
parent = *link;
cur_group = rb_entry(parent, struct inform_group, node);
if (group->trap_number < cur_group->trap_number)
link = &(*link)->rb_left;
else if (group->trap_number > cur_group->trap_number)
link = &(*link)->rb_right;
else
return cur_group;
}
rb_link_node(&group->node, parent, link);
rb_insert_color(&group->node, &port->table);
return NULL;
}
static void deref_port(struct inform_port *port)
{
if (atomic_dec_and_test(&port->refcount))
complete(&port->comp);
}
static void release_group(struct inform_group *group)
{
struct inform_port *port = group->port;
unsigned long flags;
spin_lock_irqsave(&port->lock, flags);
if (atomic_dec_and_test(&group->refcount)) {
rb_erase(&group->node, &port->table);
spin_unlock_irqrestore(&port->lock, flags);
kfree(group);
deref_port(port);
} else
spin_unlock_irqrestore(&port->lock, flags);
}
static void deref_member(struct inform_member *member)
{
if (atomic_dec_and_test(&member->refcount))
complete(&member->comp);
}
static void queue_reg(struct inform_member *member)
{
struct inform_group *group = member->group;
unsigned long flags;
spin_lock_irqsave(&group->lock, flags);
list_add(&member->list, &group->pending_list);
if (group->state == INFORM_IDLE) {
group->state = INFORM_BUSY;
atomic_inc(&group->refcount);
queue_work(inform_wq, &group->work);
}
spin_unlock_irqrestore(&group->lock, flags);
}
static int send_reg(struct inform_group *group, struct inform_member *member)
{
struct inform_port *port = group->port;
struct ib_sa_inform inform;
int ret;
memset(&inform, 0, sizeof inform);
inform.lid_range_begin = cpu_to_be16(0xFFFF);
inform.is_generic = 1;
inform.subscribe = 1;
inform.type = cpu_to_be16(IB_SA_EVENT_TYPE_ALL);
inform.trap.generic.trap_num = cpu_to_be16(member->info.trap_number);
inform.trap.generic.resp_time = 19;
inform.trap.generic.producer_type =
cpu_to_be32(IB_SA_EVENT_PRODUCER_TYPE_ALL);
group->last_join = member;
ret = ib_sa_informinfo_query(&sa_client, port->dev->device,
port->port_num, &inform, 3000, GFP_KERNEL,
reg_handler, group,&group->query);
if (ret >= 0) {
group->query_id = ret;
ret = 0;
}
return ret;
}
static int send_unreg(struct inform_group *group)
{
struct inform_port *port = group->port;
struct ib_sa_inform inform;
int ret;
memset(&inform, 0, sizeof inform);
inform.lid_range_begin = cpu_to_be16(0xFFFF);
inform.is_generic = 1;
inform.type = cpu_to_be16(IB_SA_EVENT_TYPE_ALL);
inform.trap.generic.trap_num = cpu_to_be16(group->trap_number);
inform.trap.generic.qpn = IB_QP1;
inform.trap.generic.resp_time = 19;
inform.trap.generic.producer_type =
cpu_to_be32(IB_SA_EVENT_PRODUCER_TYPE_ALL);
ret = ib_sa_informinfo_query(&sa_client, port->dev->device,
port->port_num, &inform, 3000, GFP_KERNEL,
unreg_handler, group, &group->query);
if (ret >= 0) {
group->query_id = ret;
ret = 0;
}
return ret;
}
static void join_group(struct inform_group *group, struct inform_member *member)
{
member->state = INFORM_MEMBER;
group->members++;
list_move(&member->list, &group->active_list);
}
static int fail_join(struct inform_group *group, struct inform_member *member,
int status)
{
spin_lock_irq(&group->lock);
list_del_init(&member->list);
spin_unlock_irq(&group->lock);
return member->info.callback(status, &member->info, NULL);
}
static void process_group_error(struct inform_group *group)
{
struct inform_member *member;
int ret;
spin_lock_irq(&group->lock);
while (!list_empty(&group->active_list)) {
member = list_entry(group->active_list.next,
struct inform_member, list);
atomic_inc(&member->refcount);
list_del_init(&member->list);
group->members--;
member->state = INFORM_ERROR;
spin_unlock_irq(&group->lock);
ret = member->info.callback(-ENETRESET, &member->info, NULL);
deref_member(member);
if (ret)
ib_sa_unregister_inform_info(&member->info);
spin_lock_irq(&group->lock);
}
group->join_state = INFORM_IDLE;
group->state = INFORM_BUSY;
spin_unlock_irq(&group->lock);
}
/*
* Report a notice to all active subscribers. We use a temporary list to
* handle unsubscription requests while the notice is being reported, which
* avoids holding the group lock while in the user's callback.
*/
static void process_notice(struct inform_group *group,
struct inform_notice *info_notice)
{
struct inform_member *member;
struct list_head list;
int ret;
INIT_LIST_HEAD(&list);
spin_lock_irq(&group->lock);
list_splice_init(&group->active_list, &list);
while (!list_empty(&list)) {
member = list_entry(list.next, struct inform_member, list);
atomic_inc(&member->refcount);
list_move(&member->list, &group->active_list);
spin_unlock_irq(&group->lock);
ret = member->info.callback(0, &member->info,
&info_notice->notice);
deref_member(member);
if (ret)
ib_sa_unregister_inform_info(&member->info);
spin_lock_irq(&group->lock);
}
spin_unlock_irq(&group->lock);
}
static void inform_work_handler(struct work_struct *work)
{
struct inform_group *group;
struct inform_member *member;
struct ib_inform_info *info;
struct inform_notice *info_notice;
int status, ret;
group = container_of(work, typeof(*group), work);
retest:
spin_lock_irq(&group->lock);
while (!list_empty(&group->pending_list) ||
!list_empty(&group->notice_list) ||
(group->state == INFORM_ERROR)) {
if (group->state == INFORM_ERROR) {
spin_unlock_irq(&group->lock);
process_group_error(group);
goto retest;
}
if (!list_empty(&group->notice_list)) {
info_notice = list_entry(group->notice_list.next,
struct inform_notice, list);
list_del(&info_notice->list);
spin_unlock_irq(&group->lock);
process_notice(group, info_notice);
kfree(info_notice);
goto retest;
}
member = list_entry(group->pending_list.next,
struct inform_member, list);
info = &member->info;
atomic_inc(&member->refcount);
if (group->join_state == INFORM_MEMBER) {
join_group(group, member);
spin_unlock_irq(&group->lock);
ret = info->callback(0, info, NULL);
} else {
spin_unlock_irq(&group->lock);
status = send_reg(group, member);
if (!status) {
deref_member(member);
return;
}
ret = fail_join(group, member, status);
}
deref_member(member);
if (ret)
ib_sa_unregister_inform_info(&member->info);
spin_lock_irq(&group->lock);
}
if (!group->members && (group->join_state == INFORM_MEMBER)) {
group->join_state = INFORM_IDLE;
spin_unlock_irq(&group->lock);
if (send_unreg(group))
goto retest;
} else {
group->state = INFORM_IDLE;
spin_unlock_irq(&group->lock);
release_group(group);
}
}
/*
* Fail a join request if it is still active - at the head of the pending queue.
*/
static void process_join_error(struct inform_group *group, int status)
{
struct inform_member *member;
int ret;
spin_lock_irq(&group->lock);
member = list_entry(group->pending_list.next,
struct inform_member, list);
if (group->last_join == member) {
atomic_inc(&member->refcount);
list_del_init(&member->list);
spin_unlock_irq(&group->lock);
ret = member->info.callback(status, &member->info, NULL);
deref_member(member);
if (ret)
ib_sa_unregister_inform_info(&member->info);
} else
spin_unlock_irq(&group->lock);
}
static void reg_handler(int status, struct ib_sa_inform *inform, void *context)
{
struct inform_group *group = context;
if (status)
process_join_error(group, status);
else
group->join_state = INFORM_MEMBER;
inform_work_handler(&group->work);
}
static void unreg_handler(int status, struct ib_sa_inform *rec, void *context)
{
struct inform_group *group = context;
inform_work_handler(&group->work);
}
int notice_dispatch(struct ib_device *device, u8 port_num,
struct ib_sa_notice *notice)
{
struct inform_device *dev;
struct inform_port *port;
struct inform_group *group;
struct inform_notice *info_notice;
dev = ib_get_client_data(device, &inform_client);
if (!dev)
return 0; /* No one to give notice to. */
port = &dev->port[port_num - dev->start_port];
spin_lock_irq(&port->lock);
group = inform_find(port, __be16_to_cpu(notice->trap.
generic.trap_num));
if (!group) {
spin_unlock_irq(&port->lock);
return 0;
}
atomic_inc(&group->refcount);
spin_unlock_irq(&port->lock);
info_notice = kmalloc(sizeof *info_notice, GFP_KERNEL);
if (!info_notice) {
release_group(group);
return -ENOMEM;
}
info_notice->notice = *notice;
spin_lock_irq(&group->lock);
list_add(&info_notice->list, &group->notice_list);
if (group->state == INFORM_IDLE) {
group->state = INFORM_BUSY;
spin_unlock_irq(&group->lock);
inform_work_handler(&group->work);
} else {
spin_unlock_irq(&group->lock);
release_group(group);
}
return 0;
}
static struct inform_group *acquire_group(struct inform_port *port,
u16 trap_number, gfp_t gfp_mask)
{
struct inform_group *group, *cur_group;
unsigned long flags;
spin_lock_irqsave(&port->lock, flags);
group = inform_find(port, trap_number);
if (group)
goto found;
spin_unlock_irqrestore(&port->lock, flags);
group = kzalloc(sizeof *group, gfp_mask);
if (!group)
return NULL;
group->port = port;
group->trap_number = trap_number;
INIT_LIST_HEAD(&group->pending_list);
INIT_LIST_HEAD(&group->active_list);
INIT_LIST_HEAD(&group->notice_list);
INIT_WORK(&group->work, inform_work_handler);
spin_lock_init(&group->lock);
spin_lock_irqsave(&port->lock, flags);
cur_group = inform_insert(port, group);
if (cur_group) {
kfree(group);
group = cur_group;
} else
atomic_inc(&port->refcount);
found:
atomic_inc(&group->refcount);
spin_unlock_irqrestore(&port->lock, flags);
return group;
}
/*
* We serialize all join requests to a single group to make our lives much
* easier. Otherwise, two users could try to join the same group
* simultaneously, with different configurations, one could leave while the
* join is in progress, etc., which makes locking around error recovery
* difficult.
*/
struct ib_inform_info *
ib_sa_register_inform_info(struct ib_sa_client *client,
struct ib_device *device, u8 port_num,
u16 trap_number, gfp_t gfp_mask,
int (*callback)(int status,
struct ib_inform_info *info,
struct ib_sa_notice *notice),
void *context)
{
struct inform_device *dev;
struct inform_member *member;
struct ib_inform_info *info;
int ret;
dev = ib_get_client_data(device, &inform_client);
if (!dev)
return ERR_PTR(-ENODEV);
member = kzalloc(sizeof *member, gfp_mask);
if (!member)
return ERR_PTR(-ENOMEM);
ib_sa_client_get(client);
member->client = client;
member->info.trap_number = trap_number;
member->info.callback = callback;
member->info.context = context;
init_completion(&member->comp);
atomic_set(&member->refcount, 1);
member->state = INFORM_REGISTERING;
member->group = acquire_group(&dev->port[port_num - dev->start_port],
trap_number, gfp_mask);
if (!member->group) {
ret = -ENOMEM;
goto err;
}
/*
* The user will get the info structure in their callback. They
* could then free the info structure before we can return from
* this routine. So we save the pointer to return before queuing
* any callback.
*/
info = &member->info;
queue_reg(member);
return info;
err:
ib_sa_client_put(member->client);
kfree(member);
return ERR_PTR(ret);
}
EXPORT_SYMBOL(ib_sa_register_inform_info);
void ib_sa_unregister_inform_info(struct ib_inform_info *info)
{
struct inform_member *member;
struct inform_group *group;
member = container_of(info, struct inform_member, info);
group = member->group;
spin_lock_irq(&group->lock);
if (member->state == INFORM_MEMBER)
group->members--;
list_del_init(&member->list);
if (group->state == INFORM_IDLE) {
group->state = INFORM_BUSY;
spin_unlock_irq(&group->lock);
/* Continue to hold reference on group until callback */
queue_work(inform_wq, &group->work);
} else {
spin_unlock_irq(&group->lock);
release_group(group);
}
deref_member(member);
wait_for_completion(&member->comp);
ib_sa_client_put(member->client);
kfree(member);
}
EXPORT_SYMBOL(ib_sa_unregister_inform_info);
static void inform_groups_lost(struct inform_port *port)
{
struct inform_group *group;
struct rb_node *node;
unsigned long flags;
spin_lock_irqsave(&port->lock, flags);
for (node = rb_first(&port->table); node; node = rb_next(node)) {
group = rb_entry(node, struct inform_group, node);
spin_lock(&group->lock);
if (group->state == INFORM_IDLE) {
atomic_inc(&group->refcount);
queue_work(inform_wq, &group->work);
}
group->state = INFORM_ERROR;
spin_unlock(&group->lock);
}
spin_unlock_irqrestore(&port->lock, flags);
}
static void inform_event_handler(struct ib_event_handler *handler,
struct ib_event *event)
{
struct inform_device *dev;
dev = container_of(handler, struct inform_device, event_handler);
switch (event->event) {
case IB_EVENT_PORT_ERR:
case IB_EVENT_LID_CHANGE:
case IB_EVENT_SM_CHANGE:
case IB_EVENT_CLIENT_REREGISTER:
inform_groups_lost(&dev->port[event->element.port_num -
dev->start_port]);
break;
default:
break;
}
}
static void inform_add_one(struct ib_device *device)
{
struct inform_device *dev;
struct inform_port *port;
int i;
if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
return;
dev = kmalloc(sizeof *dev + device->phys_port_cnt * sizeof *port,
GFP_KERNEL);
if (!dev)
return;
if (device->node_type == RDMA_NODE_IB_SWITCH)
dev->start_port = dev->end_port = 0;
else {
dev->start_port = 1;
dev->end_port = device->phys_port_cnt;
}
for (i = 0; i <= dev->end_port - dev->start_port; i++) {
port = &dev->port[i];
port->dev = dev;
port->port_num = dev->start_port + i;
spin_lock_init(&port->lock);
port->table = RB_ROOT;
init_completion(&port->comp);
atomic_set(&port->refcount, 1);
}
dev->device = device;
ib_set_client_data(device, &inform_client, dev);
INIT_IB_EVENT_HANDLER(&dev->event_handler, device, inform_event_handler);
ib_register_event_handler(&dev->event_handler);
}
static void inform_remove_one(struct ib_device *device)
{
struct inform_device *dev;
struct inform_port *port;
int i;
dev = ib_get_client_data(device, &inform_client);
if (!dev)
return;
ib_unregister_event_handler(&dev->event_handler);
flush_workqueue(inform_wq);
for (i = 0; i <= dev->end_port - dev->start_port; i++) {
port = &dev->port[i];
deref_port(port);
wait_for_completion(&port->comp);
}
kfree(dev);
}
int notice_init(void)
{
int ret;
inform_wq = create_singlethread_workqueue("ib_inform");
if (!inform_wq)
return -ENOMEM;
ib_sa_register_client(&sa_client);
ret = ib_register_client(&inform_client);
if (ret)
goto err;
return 0;
err:
ib_sa_unregister_client(&sa_client);
destroy_workqueue(inform_wq);
return ret;
}
void notice_cleanup(void)
{
ib_unregister_client(&inform_client);
ib_sa_unregister_client(&sa_client);
destroy_workqueue(inform_wq);
}