blob: e28a494e2a3a0f72b41af479b269262c6472cb77 [file] [log] [blame]
/*
* Copyright (c) 2004-2007 Intel Corporation. All rights reserved.
* Copyright (c) 2004 Topspin Corporation. All rights reserved.
* Copyright (c) 2004, 2005 Voltaire Corporation. All rights reserved.
* Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <linux/completion.h>
#include <linux/dma-mapping.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/err.h>
#include <linux/idr.h>
#include <linux/interrupt.h>
#include <linux/random.h>
#include <linux/rbtree.h>
#include <linux/spinlock.h>
#include <linux/slab.h>
#include <linux/sysfs.h>
#include <linux/workqueue.h>
#include <linux/kdev_t.h>
#include <linux/etherdevice.h>
#include <rdma/ib_cache.h>
#include <rdma/ib_cm.h>
#include "cm_msgs.h"
MODULE_AUTHOR("Sean Hefty");
MODULE_DESCRIPTION("InfiniBand CM");
MODULE_LICENSE("Dual BSD/GPL");
static void cm_add_one(struct ib_device *device);
static void cm_remove_one(struct ib_device *device);
static struct ib_client cm_client = {
.name = "cm",
.add = cm_add_one,
.remove = cm_remove_one
};
static struct ib_cm {
spinlock_t lock;
struct list_head device_list;
rwlock_t device_lock;
struct rb_root listen_service_table;
u64 listen_service_id;
/* struct rb_root peer_service_table; todo: fix peer to peer */
struct rb_root remote_qp_table;
struct rb_root remote_id_table;
struct rb_root remote_sidr_table;
struct idr local_id_table;
__be32 random_id_operand;
struct list_head timewait_list;
struct workqueue_struct *wq;
} cm;
/* Counter indexes ordered by attribute ID */
enum {
CM_REQ_COUNTER,
CM_MRA_COUNTER,
CM_REJ_COUNTER,
CM_REP_COUNTER,
CM_RTU_COUNTER,
CM_DREQ_COUNTER,
CM_DREP_COUNTER,
CM_SIDR_REQ_COUNTER,
CM_SIDR_REP_COUNTER,
CM_LAP_COUNTER,
CM_APR_COUNTER,
CM_ATTR_COUNT,
CM_ATTR_ID_OFFSET = 0x0010,
};
enum {
CM_XMIT,
CM_XMIT_RETRIES,
CM_RECV,
CM_RECV_DUPLICATES,
CM_COUNTER_GROUPS
};
static char const counter_group_names[CM_COUNTER_GROUPS]
[sizeof("cm_rx_duplicates")] = {
"cm_tx_msgs", "cm_tx_retries",
"cm_rx_msgs", "cm_rx_duplicates"
};
struct cm_counter_group {
struct kobject obj;
atomic_long_t counter[CM_ATTR_COUNT];
};
struct cm_counter_attribute {
struct attribute attr;
int index;
};
#define CM_COUNTER_ATTR(_name, _index) \
struct cm_counter_attribute cm_##_name##_counter_attr = { \
.attr = { .name = __stringify(_name), .mode = 0444 }, \
.index = _index \
}
static CM_COUNTER_ATTR(req, CM_REQ_COUNTER);
static CM_COUNTER_ATTR(mra, CM_MRA_COUNTER);
static CM_COUNTER_ATTR(rej, CM_REJ_COUNTER);
static CM_COUNTER_ATTR(rep, CM_REP_COUNTER);
static CM_COUNTER_ATTR(rtu, CM_RTU_COUNTER);
static CM_COUNTER_ATTR(dreq, CM_DREQ_COUNTER);
static CM_COUNTER_ATTR(drep, CM_DREP_COUNTER);
static CM_COUNTER_ATTR(sidr_req, CM_SIDR_REQ_COUNTER);
static CM_COUNTER_ATTR(sidr_rep, CM_SIDR_REP_COUNTER);
static CM_COUNTER_ATTR(lap, CM_LAP_COUNTER);
static CM_COUNTER_ATTR(apr, CM_APR_COUNTER);
static struct attribute *cm_counter_default_attrs[] = {
&cm_req_counter_attr.attr,
&cm_mra_counter_attr.attr,
&cm_rej_counter_attr.attr,
&cm_rep_counter_attr.attr,
&cm_rtu_counter_attr.attr,
&cm_dreq_counter_attr.attr,
&cm_drep_counter_attr.attr,
&cm_sidr_req_counter_attr.attr,
&cm_sidr_rep_counter_attr.attr,
&cm_lap_counter_attr.attr,
&cm_apr_counter_attr.attr,
NULL
};
struct cm_port {
struct cm_device *cm_dev;
struct ib_mad_agent *mad_agent;
struct kobject port_obj;
u8 port_num;
struct cm_counter_group counter_group[CM_COUNTER_GROUPS];
};
struct cm_device {
struct list_head list;
struct ib_device *ib_device;
struct device *device;
u8 ack_delay;
struct cm_port *port[0];
};
struct cm_av {
struct cm_port *port;
union ib_gid dgid;
struct ib_ah_attr ah_attr;
u16 pkey_index;
u8 timeout;
u8 valid;
u8 smac[ETH_ALEN];
};
struct cm_work {
struct delayed_work work;
struct list_head list;
struct cm_port *port;
struct ib_mad_recv_wc *mad_recv_wc; /* Received MADs */
__be32 local_id; /* Established / timewait */
__be32 remote_id;
struct ib_cm_event cm_event;
struct ib_sa_path_rec path[0];
};
struct cm_timewait_info {
struct cm_work work; /* Must be first. */
struct list_head list;
struct rb_node remote_qp_node;
struct rb_node remote_id_node;
__be64 remote_ca_guid;
__be32 remote_qpn;
u8 inserted_remote_qp;
u8 inserted_remote_id;
};
struct cm_id_private {
struct ib_cm_id id;
struct rb_node service_node;
struct rb_node sidr_id_node;
spinlock_t lock; /* Do not acquire inside cm.lock */
struct completion comp;
atomic_t refcount;
struct ib_mad_send_buf *msg;
struct cm_timewait_info *timewait_info;
/* todo: use alternate port on send failure */
struct cm_av av;
struct cm_av alt_av;
struct ib_cm_compare_data *compare_data;
void *private_data;
__be64 tid;
__be32 local_qpn;
__be32 remote_qpn;
enum ib_qp_type qp_type;
__be32 sq_psn;
__be32 rq_psn;
int timeout_ms;
enum ib_mtu path_mtu;
__be16 pkey;
u8 private_data_len;
u8 max_cm_retries;
u8 peer_to_peer;
u8 responder_resources;
u8 initiator_depth;
u8 retry_count;
u8 rnr_retry_count;
u8 service_timeout;
u8 target_ack_delay;
struct list_head work_list;
atomic_t work_count;
};
static void cm_work_handler(struct work_struct *work);
static inline void cm_deref_id(struct cm_id_private *cm_id_priv)
{
if (atomic_dec_and_test(&cm_id_priv->refcount))
complete(&cm_id_priv->comp);
}
static int cm_alloc_msg(struct cm_id_private *cm_id_priv,
struct ib_mad_send_buf **msg)
{
struct ib_mad_agent *mad_agent;
struct ib_mad_send_buf *m;
struct ib_ah *ah;
mad_agent = cm_id_priv->av.port->mad_agent;
ah = ib_create_ah(mad_agent->qp->pd, &cm_id_priv->av.ah_attr);
if (IS_ERR(ah))
return PTR_ERR(ah);
m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn,
cm_id_priv->av.pkey_index,
0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
GFP_ATOMIC);
if (IS_ERR(m)) {
ib_destroy_ah(ah);
return PTR_ERR(m);
}
/* Timeout set by caller if response is expected. */
m->ah = ah;
m->retries = cm_id_priv->max_cm_retries;
atomic_inc(&cm_id_priv->refcount);
m->context[0] = cm_id_priv;
*msg = m;
return 0;
}
static int cm_alloc_response_msg(struct cm_port *port,
struct ib_mad_recv_wc *mad_recv_wc,
struct ib_mad_send_buf **msg)
{
struct ib_mad_send_buf *m;
struct ib_ah *ah;
ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc,
mad_recv_wc->recv_buf.grh, port->port_num);
if (IS_ERR(ah))
return PTR_ERR(ah);
m = ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index,
0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
GFP_ATOMIC);
if (IS_ERR(m)) {
ib_destroy_ah(ah);
return PTR_ERR(m);
}
m->ah = ah;
*msg = m;
return 0;
}
static void cm_free_msg(struct ib_mad_send_buf *msg)
{
ib_destroy_ah(msg->ah);
if (msg->context[0])
cm_deref_id(msg->context[0]);
ib_free_send_mad(msg);
}
static void * cm_copy_private_data(const void *private_data,
u8 private_data_len)
{
void *data;
if (!private_data || !private_data_len)
return NULL;
data = kmemdup(private_data, private_data_len, GFP_KERNEL);
if (!data)
return ERR_PTR(-ENOMEM);
return data;
}
static void cm_set_private_data(struct cm_id_private *cm_id_priv,
void *private_data, u8 private_data_len)
{
if (cm_id_priv->private_data && cm_id_priv->private_data_len)
kfree(cm_id_priv->private_data);
cm_id_priv->private_data = private_data;
cm_id_priv->private_data_len = private_data_len;
}
static void cm_init_av_for_response(struct cm_port *port, struct ib_wc *wc,
struct ib_grh *grh, struct cm_av *av)
{
av->port = port;
av->pkey_index = wc->pkey_index;
ib_init_ah_from_wc(port->cm_dev->ib_device, port->port_num, wc,
grh, &av->ah_attr);
}
static int cm_init_av_by_path(struct ib_sa_path_rec *path, struct cm_av *av)
{
struct cm_device *cm_dev;
struct cm_port *port = NULL;
unsigned long flags;
int ret;
u8 p;
read_lock_irqsave(&cm.device_lock, flags);
list_for_each_entry(cm_dev, &cm.device_list, list) {
if (!ib_find_cached_gid(cm_dev->ib_device, &path->sgid,
&p, NULL)) {
port = cm_dev->port[p-1];
break;
}
}
read_unlock_irqrestore(&cm.device_lock, flags);
if (!port)
return -EINVAL;
ret = ib_find_cached_pkey(cm_dev->ib_device, port->port_num,
be16_to_cpu(path->pkey), &av->pkey_index);
if (ret)
return ret;
av->port = port;
ib_init_ah_from_path(cm_dev->ib_device, port->port_num, path,
&av->ah_attr);
av->timeout = path->packet_life_time + 1;
memcpy(av->smac, path->smac, sizeof(av->smac));
av->valid = 1;
return 0;
}
static int cm_alloc_id(struct cm_id_private *cm_id_priv)
{
unsigned long flags;
int id;
idr_preload(GFP_KERNEL);
spin_lock_irqsave(&cm.lock, flags);
id = idr_alloc_cyclic(&cm.local_id_table, cm_id_priv, 0, 0, GFP_NOWAIT);
spin_unlock_irqrestore(&cm.lock, flags);
idr_preload_end();
cm_id_priv->id.local_id = (__force __be32)id ^ cm.random_id_operand;
return id < 0 ? id : 0;
}
static void cm_free_id(__be32 local_id)
{
spin_lock_irq(&cm.lock);
idr_remove(&cm.local_id_table,
(__force int) (local_id ^ cm.random_id_operand));
spin_unlock_irq(&cm.lock);
}
static struct cm_id_private * cm_get_id(__be32 local_id, __be32 remote_id)
{
struct cm_id_private *cm_id_priv;
cm_id_priv = idr_find(&cm.local_id_table,
(__force int) (local_id ^ cm.random_id_operand));
if (cm_id_priv) {
if (cm_id_priv->id.remote_id == remote_id)
atomic_inc(&cm_id_priv->refcount);
else
cm_id_priv = NULL;
}
return cm_id_priv;
}
static struct cm_id_private * cm_acquire_id(__be32 local_id, __be32 remote_id)
{
struct cm_id_private *cm_id_priv;
spin_lock_irq(&cm.lock);
cm_id_priv = cm_get_id(local_id, remote_id);
spin_unlock_irq(&cm.lock);
return cm_id_priv;
}
static void cm_mask_copy(u8 *dst, u8 *src, u8 *mask)
{
int i;
for (i = 0; i < IB_CM_COMPARE_SIZE / sizeof(unsigned long); i++)
((unsigned long *) dst)[i] = ((unsigned long *) src)[i] &
((unsigned long *) mask)[i];
}
static int cm_compare_data(struct ib_cm_compare_data *src_data,
struct ib_cm_compare_data *dst_data)
{
u8 src[IB_CM_COMPARE_SIZE];
u8 dst[IB_CM_COMPARE_SIZE];
if (!src_data || !dst_data)
return 0;
cm_mask_copy(src, src_data->data, dst_data->mask);
cm_mask_copy(dst, dst_data->data, src_data->mask);
return memcmp(src, dst, IB_CM_COMPARE_SIZE);
}
static int cm_compare_private_data(u8 *private_data,
struct ib_cm_compare_data *dst_data)
{
u8 src[IB_CM_COMPARE_SIZE];
if (!dst_data)
return 0;
cm_mask_copy(src, private_data, dst_data->mask);
return memcmp(src, dst_data->data, IB_CM_COMPARE_SIZE);
}
/*
* Trivial helpers to strip endian annotation and compare; the
* endianness doesn't actually matter since we just need a stable
* order for the RB tree.
*/
static int be32_lt(__be32 a, __be32 b)
{
return (__force u32) a < (__force u32) b;
}
static int be32_gt(__be32 a, __be32 b)
{
return (__force u32) a > (__force u32) b;
}
static int be64_lt(__be64 a, __be64 b)
{
return (__force u64) a < (__force u64) b;
}
static int be64_gt(__be64 a, __be64 b)
{
return (__force u64) a > (__force u64) b;
}
static struct cm_id_private * cm_insert_listen(struct cm_id_private *cm_id_priv)
{
struct rb_node **link = &cm.listen_service_table.rb_node;
struct rb_node *parent = NULL;
struct cm_id_private *cur_cm_id_priv;
__be64 service_id = cm_id_priv->id.service_id;
__be64 service_mask = cm_id_priv->id.service_mask;
int data_cmp;
while (*link) {
parent = *link;
cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
service_node);
data_cmp = cm_compare_data(cm_id_priv->compare_data,
cur_cm_id_priv->compare_data);
if ((cur_cm_id_priv->id.service_mask & service_id) ==
(service_mask & cur_cm_id_priv->id.service_id) &&
(cm_id_priv->id.device == cur_cm_id_priv->id.device) &&
!data_cmp)
return cur_cm_id_priv;
if (cm_id_priv->id.device < cur_cm_id_priv->id.device)
link = &(*link)->rb_left;
else if (cm_id_priv->id.device > cur_cm_id_priv->id.device)
link = &(*link)->rb_right;
else if (be64_lt(service_id, cur_cm_id_priv->id.service_id))
link = &(*link)->rb_left;
else if (be64_gt(service_id, cur_cm_id_priv->id.service_id))
link = &(*link)->rb_right;
else if (data_cmp < 0)
link = &(*link)->rb_left;
else
link = &(*link)->rb_right;
}
rb_link_node(&cm_id_priv->service_node, parent, link);
rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table);
return NULL;
}
static struct cm_id_private * cm_find_listen(struct ib_device *device,
__be64 service_id,
u8 *private_data)
{
struct rb_node *node = cm.listen_service_table.rb_node;
struct cm_id_private *cm_id_priv;
int data_cmp;
while (node) {
cm_id_priv = rb_entry(node, struct cm_id_private, service_node);
data_cmp = cm_compare_private_data(private_data,
cm_id_priv->compare_data);
if ((cm_id_priv->id.service_mask & service_id) ==
cm_id_priv->id.service_id &&
(cm_id_priv->id.device == device) && !data_cmp)
return cm_id_priv;
if (device < cm_id_priv->id.device)
node = node->rb_left;
else if (device > cm_id_priv->id.device)
node = node->rb_right;
else if (be64_lt(service_id, cm_id_priv->id.service_id))
node = node->rb_left;
else if (be64_gt(service_id, cm_id_priv->id.service_id))
node = node->rb_right;
else if (data_cmp < 0)
node = node->rb_left;
else
node = node->rb_right;
}
return NULL;
}
static struct cm_timewait_info * cm_insert_remote_id(struct cm_timewait_info
*timewait_info)
{
struct rb_node **link = &cm.remote_id_table.rb_node;
struct rb_node *parent = NULL;
struct cm_timewait_info *cur_timewait_info;
__be64 remote_ca_guid = timewait_info->remote_ca_guid;
__be32 remote_id = timewait_info->work.remote_id;
while (*link) {
parent = *link;
cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
remote_id_node);
if (be32_lt(remote_id, cur_timewait_info->work.remote_id))
link = &(*link)->rb_left;
else if (be32_gt(remote_id, cur_timewait_info->work.remote_id))
link = &(*link)->rb_right;
else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
link = &(*link)->rb_left;
else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
link = &(*link)->rb_right;
else
return cur_timewait_info;
}
timewait_info->inserted_remote_id = 1;
rb_link_node(&timewait_info->remote_id_node, parent, link);
rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table);
return NULL;
}
static struct cm_timewait_info * cm_find_remote_id(__be64 remote_ca_guid,
__be32 remote_id)
{
struct rb_node *node = cm.remote_id_table.rb_node;
struct cm_timewait_info *timewait_info;
while (node) {
timewait_info = rb_entry(node, struct cm_timewait_info,
remote_id_node);
if (be32_lt(remote_id, timewait_info->work.remote_id))
node = node->rb_left;
else if (be32_gt(remote_id, timewait_info->work.remote_id))
node = node->rb_right;
else if (be64_lt(remote_ca_guid, timewait_info->remote_ca_guid))
node = node->rb_left;
else if (be64_gt(remote_ca_guid, timewait_info->remote_ca_guid))
node = node->rb_right;
else
return timewait_info;
}
return NULL;
}
static struct cm_timewait_info * cm_insert_remote_qpn(struct cm_timewait_info
*timewait_info)
{
struct rb_node **link = &cm.remote_qp_table.rb_node;
struct rb_node *parent = NULL;
struct cm_timewait_info *cur_timewait_info;
__be64 remote_ca_guid = timewait_info->remote_ca_guid;
__be32 remote_qpn = timewait_info->remote_qpn;
while (*link) {
parent = *link;
cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
remote_qp_node);
if (be32_lt(remote_qpn, cur_timewait_info->remote_qpn))
link = &(*link)->rb_left;
else if (be32_gt(remote_qpn, cur_timewait_info->remote_qpn))
link = &(*link)->rb_right;
else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
link = &(*link)->rb_left;
else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
link = &(*link)->rb_right;
else
return cur_timewait_info;
}
timewait_info->inserted_remote_qp = 1;
rb_link_node(&timewait_info->remote_qp_node, parent, link);
rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table);
return NULL;
}
static struct cm_id_private * cm_insert_remote_sidr(struct cm_id_private
*cm_id_priv)
{
struct rb_node **link = &cm.remote_sidr_table.rb_node;
struct rb_node *parent = NULL;
struct cm_id_private *cur_cm_id_priv;
union ib_gid *port_gid = &cm_id_priv->av.dgid;
__be32 remote_id = cm_id_priv->id.remote_id;
while (*link) {
parent = *link;
cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
sidr_id_node);
if (be32_lt(remote_id, cur_cm_id_priv->id.remote_id))
link = &(*link)->rb_left;
else if (be32_gt(remote_id, cur_cm_id_priv->id.remote_id))
link = &(*link)->rb_right;
else {
int cmp;
cmp = memcmp(port_gid, &cur_cm_id_priv->av.dgid,
sizeof *port_gid);
if (cmp < 0)
link = &(*link)->rb_left;
else if (cmp > 0)
link = &(*link)->rb_right;
else
return cur_cm_id_priv;
}
}
rb_link_node(&cm_id_priv->sidr_id_node, parent, link);
rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
return NULL;
}
static void cm_reject_sidr_req(struct cm_id_private *cm_id_priv,
enum ib_cm_sidr_status status)
{
struct ib_cm_sidr_rep_param param;
memset(&param, 0, sizeof param);
param.status = status;
ib_send_cm_sidr_rep(&cm_id_priv->id, &param);
}
struct ib_cm_id *ib_create_cm_id(struct ib_device *device,
ib_cm_handler cm_handler,
void *context)
{
struct cm_id_private *cm_id_priv;
int ret;
cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL);
if (!cm_id_priv)
return ERR_PTR(-ENOMEM);
cm_id_priv->id.state = IB_CM_IDLE;
cm_id_priv->id.device = device;
cm_id_priv->id.cm_handler = cm_handler;
cm_id_priv->id.context = context;
cm_id_priv->id.remote_cm_qpn = 1;
ret = cm_alloc_id(cm_id_priv);
if (ret)
goto error;
spin_lock_init(&cm_id_priv->lock);
init_completion(&cm_id_priv->comp);
INIT_LIST_HEAD(&cm_id_priv->work_list);
atomic_set(&cm_id_priv->work_count, -1);
atomic_set(&cm_id_priv->refcount, 1);
return &cm_id_priv->id;
error:
kfree(cm_id_priv);
return ERR_PTR(-ENOMEM);
}
EXPORT_SYMBOL(ib_create_cm_id);
static struct cm_work * cm_dequeue_work(struct cm_id_private *cm_id_priv)
{
struct cm_work *work;
if (list_empty(&cm_id_priv->work_list))
return NULL;
work = list_entry(cm_id_priv->work_list.next, struct cm_work, list);
list_del(&work->list);
return work;
}
static void cm_free_work(struct cm_work *work)
{
if (work->mad_recv_wc)
ib_free_recv_mad(work->mad_recv_wc);
kfree(work);
}
static inline int cm_convert_to_ms(int iba_time)
{
/* approximate conversion to ms from 4.096us x 2^iba_time */
return 1 << max(iba_time - 8, 0);
}
/*
* calculate: 4.096x2^ack_timeout = 4.096x2^ack_delay + 2x4.096x2^life_time
* Because of how ack_timeout is stored, adding one doubles the timeout.
* To avoid large timeouts, select the max(ack_delay, life_time + 1), and
* increment it (round up) only if the other is within 50%.
*/
static u8 cm_ack_timeout(u8 ca_ack_delay, u8 packet_life_time)
{
int ack_timeout = packet_life_time + 1;
if (ack_timeout >= ca_ack_delay)
ack_timeout += (ca_ack_delay >= (ack_timeout - 1));
else
ack_timeout = ca_ack_delay +
(ack_timeout >= (ca_ack_delay - 1));
return min(31, ack_timeout);
}
static void cm_cleanup_timewait(struct cm_timewait_info *timewait_info)
{
if (timewait_info->inserted_remote_id) {
rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table);
timewait_info->inserted_remote_id = 0;
}
if (timewait_info->inserted_remote_qp) {
rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table);
timewait_info->inserted_remote_qp = 0;
}
}
static struct cm_timewait_info * cm_create_timewait_info(__be32 local_id)
{
struct cm_timewait_info *timewait_info;
timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL);
if (!timewait_info)
return ERR_PTR(-ENOMEM);
timewait_info->work.local_id = local_id;
INIT_DELAYED_WORK(&timewait_info->work.work, cm_work_handler);
timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT;
return timewait_info;
}
static void cm_enter_timewait(struct cm_id_private *cm_id_priv)
{
int wait_time;
unsigned long flags;
spin_lock_irqsave(&cm.lock, flags);
cm_cleanup_timewait(cm_id_priv->timewait_info);
list_add_tail(&cm_id_priv->timewait_info->list, &cm.timewait_list);
spin_unlock_irqrestore(&cm.lock, flags);
/*
* The cm_id could be destroyed by the user before we exit timewait.
* To protect against this, we search for the cm_id after exiting
* timewait before notifying the user that we've exited timewait.
*/
cm_id_priv->id.state = IB_CM_TIMEWAIT;
wait_time = cm_convert_to_ms(cm_id_priv->av.timeout);
queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work,
msecs_to_jiffies(wait_time));
cm_id_priv->timewait_info = NULL;
}
static void cm_reset_to_idle(struct cm_id_private *cm_id_priv)
{
unsigned long flags;
cm_id_priv->id.state = IB_CM_IDLE;
if (cm_id_priv->timewait_info) {
spin_lock_irqsave(&cm.lock, flags);
cm_cleanup_timewait(cm_id_priv->timewait_info);
spin_unlock_irqrestore(&cm.lock, flags);
kfree(cm_id_priv->timewait_info);
cm_id_priv->timewait_info = NULL;
}
}
static void cm_destroy_id(struct ib_cm_id *cm_id, int err)
{
struct cm_id_private *cm_id_priv;
struct cm_work *work;
cm_id_priv = container_of(cm_id, struct cm_id_private, id);
retest:
spin_lock_irq(&cm_id_priv->lock);
switch (cm_id->state) {
case IB_CM_LISTEN:
cm_id->state = IB_CM_IDLE;
spin_unlock_irq(&cm_id_priv->lock);
spin_lock_irq(&cm.lock);
rb_erase(&cm_id_priv->service_node, &cm.listen_service_table);
spin_unlock_irq(&cm.lock);
break;
case IB_CM_SIDR_REQ_SENT:
cm_id->state = IB_CM_IDLE;
ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
spin_unlock_irq(&cm_id_priv->lock);
break;
case IB_CM_SIDR_REQ_RCVD:
spin_unlock_irq(&cm_id_priv->lock);
cm_reject_sidr_req(cm_id_priv, IB_SIDR_REJECT);
break;
case IB_CM_REQ_SENT:
ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
spin_unlock_irq(&cm_id_priv->lock);
ib_send_cm_rej(cm_id, IB_CM_REJ_TIMEOUT,
&cm_id_priv->id.device->node_guid,
sizeof cm_id_priv->id.device->node_guid,
NULL, 0);
break;
case IB_CM_REQ_RCVD:
if (err == -ENOMEM) {
/* Do not reject to allow future retries. */
cm_reset_to_idle(cm_id_priv);
spin_unlock_irq(&cm_id_priv->lock);
} else {
spin_unlock_irq(&cm_id_priv->lock);
ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
NULL, 0, NULL, 0);
}
break;
case IB_CM_MRA_REQ_RCVD:
case IB_CM_REP_SENT:
case IB_CM_MRA_REP_RCVD:
ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
/* Fall through */
case IB_CM_MRA_REQ_SENT:
case IB_CM_REP_RCVD:
case IB_CM_MRA_REP_SENT:
spin_unlock_irq(&cm_id_priv->lock);
ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
NULL, 0, NULL, 0);
break;
case IB_CM_ESTABLISHED:
spin_unlock_irq(&cm_id_priv->lock);
if (cm_id_priv->qp_type == IB_QPT_XRC_TGT)
break;
ib_send_cm_dreq(cm_id, NULL, 0);
goto retest;
case IB_CM_DREQ_SENT:
ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
cm_enter_timewait(cm_id_priv);
spin_unlock_irq(&cm_id_priv->lock);
break;
case IB_CM_DREQ_RCVD:
spin_unlock_irq(&cm_id_priv->lock);
ib_send_cm_drep(cm_id, NULL, 0);
break;
default:
spin_unlock_irq(&cm_id_priv->lock);
break;
}
cm_free_id(cm_id->local_id);
cm_deref_id(cm_id_priv);
wait_for_completion(&cm_id_priv->comp);
while ((work = cm_dequeue_work(cm_id_priv)) != NULL)
cm_free_work(work);
kfree(cm_id_priv->compare_data);
kfree(cm_id_priv->private_data);
kfree(cm_id_priv);
}
void ib_destroy_cm_id(struct ib_cm_id *cm_id)
{
cm_destroy_id(cm_id, 0);
}
EXPORT_SYMBOL(ib_destroy_cm_id);
int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask,
struct ib_cm_compare_data *compare_data)
{
struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
unsigned long flags;
int ret = 0;
service_mask = service_mask ? service_mask : ~cpu_to_be64(0);
service_id &= service_mask;
if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID &&
(service_id != IB_CM_ASSIGN_SERVICE_ID))
return -EINVAL;
cm_id_priv = container_of(cm_id, struct cm_id_private, id);
if (cm_id->state != IB_CM_IDLE)
return -EINVAL;
if (compare_data) {
cm_id_priv->compare_data = kzalloc(sizeof *compare_data,
GFP_KERNEL);
if (!cm_id_priv->compare_data)
return -ENOMEM;
cm_mask_copy(cm_id_priv->compare_data->data,
compare_data->data, compare_data->mask);
memcpy(cm_id_priv->compare_data->mask, compare_data->mask,
IB_CM_COMPARE_SIZE);
}
cm_id->state = IB_CM_LISTEN;
spin_lock_irqsave(&cm.lock, flags);
if (service_id == IB_CM_ASSIGN_SERVICE_ID) {
cm_id->service_id = cpu_to_be64(cm.listen_service_id++);
cm_id->service_mask = ~cpu_to_be64(0);
} else {
cm_id->service_id = service_id;
cm_id->service_mask = service_mask;
}
cur_cm_id_priv = cm_insert_listen(cm_id_priv);
spin_unlock_irqrestore(&cm.lock, flags);
if (cur_cm_id_priv) {
cm_id->state = IB_CM_IDLE;
kfree(cm_id_priv->compare_data);
cm_id_priv->compare_data = NULL;
ret = -EBUSY;
}
return ret;
}
EXPORT_SYMBOL(ib_cm_listen);
static __be64 cm_form_tid(struct cm_id_private *cm_id_priv,
enum cm_msg_sequence msg_seq)
{
u64 hi_tid, low_tid;
hi_tid = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32;
low_tid = (u64) ((__force u32)cm_id_priv->id.local_id |
(msg_seq << 30));
return cpu_to_be64(hi_tid | low_tid);
}
static void cm_format_mad_hdr(struct ib_mad_hdr *hdr,
__be16 attr_id, __be64 tid)
{
hdr->base_version = IB_MGMT_BASE_VERSION;
hdr->mgmt_class = IB_MGMT_CLASS_CM;
hdr->class_version = IB_CM_CLASS_VERSION;
hdr->method = IB_MGMT_METHOD_SEND;
hdr->attr_id = attr_id;
hdr->tid = tid;
}
static void cm_format_req(struct cm_req_msg *req_msg,
struct cm_id_private *cm_id_priv,
struct ib_cm_req_param *param)
{
struct ib_sa_path_rec *pri_path = param->primary_path;
struct ib_sa_path_rec *alt_path = param->alternate_path;
cm_format_mad_hdr(&req_msg->hdr, CM_REQ_ATTR_ID,
cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_REQ));
req_msg->local_comm_id = cm_id_priv->id.local_id;
req_msg->service_id = param->service_id;
req_msg->local_ca_guid = cm_id_priv->id.device->node_guid;
cm_req_set_local_qpn(req_msg, cpu_to_be32(param->qp_num));
cm_req_set_init_depth(req_msg, param->initiator_depth);
cm_req_set_remote_resp_timeout(req_msg,
param->remote_cm_response_timeout);
cm_req_set_qp_type(req_msg, param->qp_type);
cm_req_set_flow_ctrl(req_msg, param->flow_control);
cm_req_set_starting_psn(req_msg, cpu_to_be32(param->starting_psn));
cm_req_set_local_resp_timeout(req_msg,
param->local_cm_response_timeout);
req_msg->pkey = param->primary_path->pkey;
cm_req_set_path_mtu(req_msg, param->primary_path->mtu);
cm_req_set_max_cm_retries(req_msg, param->max_cm_retries);
if (param->qp_type != IB_QPT_XRC_INI) {
cm_req_set_resp_res(req_msg, param->responder_resources);
cm_req_set_retry_count(req_msg, param->retry_count);
cm_req_set_rnr_retry_count(req_msg, param->rnr_retry_count);
cm_req_set_srq(req_msg, param->srq);
}
if (pri_path->hop_limit <= 1) {
req_msg->primary_local_lid = pri_path->slid;
req_msg->primary_remote_lid = pri_path->dlid;
} else {
/* Work-around until there's a way to obtain remote LID info */
req_msg->primary_local_lid = IB_LID_PERMISSIVE;
req_msg->primary_remote_lid = IB_LID_PERMISSIVE;
}
req_msg->primary_local_gid = pri_path->sgid;
req_msg->primary_remote_gid = pri_path->dgid;
cm_req_set_primary_flow_label(req_msg, pri_path->flow_label);
cm_req_set_primary_packet_rate(req_msg, pri_path->rate);
req_msg->primary_traffic_class = pri_path->traffic_class;
req_msg->primary_hop_limit = pri_path->hop_limit;
cm_req_set_primary_sl(req_msg, pri_path->sl);
cm_req_set_primary_subnet_local(req_msg, (pri_path->hop_limit <= 1));
cm_req_set_primary_local_ack_timeout(req_msg,
cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
pri_path->packet_life_time));
if (alt_path) {
if (alt_path->hop_limit <= 1) {
req_msg->alt_local_lid = alt_path->slid;
req_msg->alt_remote_lid = alt_path->dlid;
} else {
req_msg->alt_local_lid = IB_LID_PERMISSIVE;
req_msg->alt_remote_lid = IB_LID_PERMISSIVE;
}
req_msg->alt_local_gid = alt_path->sgid;
req_msg->alt_remote_gid = alt_path->dgid;
cm_req_set_alt_flow_label(req_msg,
alt_path->flow_label);
cm_req_set_alt_packet_rate(req_msg, alt_path->rate);
req_msg->alt_traffic_class = alt_path->traffic_class;
req_msg->alt_hop_limit = alt_path->hop_limit;
cm_req_set_alt_sl(req_msg, alt_path->sl);
cm_req_set_alt_subnet_local(req_msg, (alt_path->hop_limit <= 1));
cm_req_set_alt_local_ack_timeout(req_msg,
cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
alt_path->packet_life_time));
}
if (param->private_data && param->private_data_len)
memcpy(req_msg->private_data, param->private_data,
param->private_data_len);
}
static int cm_validate_req_param(struct ib_cm_req_param *param)
{
/* peer-to-peer not supported */
if (param->peer_to_peer)
return -EINVAL;
if (!param->primary_path)
return -EINVAL;
if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC &&
param->qp_type != IB_QPT_XRC_INI)
return -EINVAL;
if (param->private_data &&
param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE)
return -EINVAL;
if (param->alternate_path &&
(param->alternate_path->pkey != param->primary_path->pkey ||
param->alternate_path->mtu != param->primary_path->mtu))
return -EINVAL;
return 0;
}
int ib_send_cm_req(struct ib_cm_id *cm_id,
struct ib_cm_req_param *param)
{
struct cm_id_private *cm_id_priv;
struct cm_req_msg *req_msg;
unsigned long flags;
int ret;
ret = cm_validate_req_param(param);
if (ret)
return ret;
/* Verify that we're not in timewait. */
cm_id_priv = container_of(cm_id, struct cm_id_private, id);
spin_lock_irqsave(&cm_id_priv->lock, flags);
if (cm_id->state != IB_CM_IDLE) {
spin_unlock_irqrestore(&cm_id_priv->lock, flags);
ret = -EINVAL;
goto out;
}
spin_unlock_irqrestore(&cm_id_priv->lock, flags);
cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
id.local_id);
if (IS_ERR(cm_id_priv->timewait_info)) {
ret = PTR_ERR(cm_id_priv->timewait_info);
goto out;
}
ret = cm_init_av_by_path(param->primary_path, &cm_id_priv->av);
if (ret)
goto error1;
if (param->alternate_path) {
ret = cm_init_av_by_path(param->alternate_path,
&cm_id_priv->alt_av);
if (ret)
goto error1;
}
cm_id->service_id = param->service_id;
cm_id->service_mask = ~cpu_to_be64(0);
cm_id_priv->timeout_ms = cm_convert_to_ms(
param->primary_path->packet_life_time) * 2 +
cm_convert_to_ms(
param->remote_cm_response_timeout);
cm_id_priv->max_cm_retries = param->max_cm_retries;
cm_id_priv->initiator_depth = param->initiator_depth;
cm_id_priv->responder_resources = param->responder_resources;
cm_id_priv->retry_count = param->retry_count;
cm_id_priv->path_mtu = param->primary_path->mtu;
cm_id_priv->pkey = param->primary_path->pkey;
cm_id_priv->qp_type = param->qp_type;
ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg);
if (ret)
goto error1;
req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad;
cm_format_req(req_msg, cm_id_priv, param);
cm_id_priv->tid = req_msg->hdr.tid;
cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms;
cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT;
cm_id_priv->local_qpn = cm_req_get_local_qpn(req_msg);
cm_id_priv->rq_psn = cm_req_get_starting_psn(req_msg);
spin_lock_irqsave(&cm_id_priv->lock, flags);
ret = ib_post_send_mad(cm_id_priv->msg, NULL);
if (ret) {
spin_unlock_irqrestore(&cm_id_priv->lock, flags);
goto error2;
}
BUG_ON(cm_id->state != IB_CM_IDLE);
cm_id->state = IB_CM_REQ_SENT;
spin_unlock_irqrestore(&cm_id_priv->lock, flags);
return 0;
error2: cm_free_msg(cm_id_priv->msg);
error1: kfree(cm_id_priv->timewait_info);
out: return ret;
}
EXPORT_SYMBOL(ib_send_cm_req);
static int cm_issue_rej(struct cm_port *port,
struct ib_mad_recv_wc *mad_recv_wc,
enum ib_cm_rej_reason reason,
enum cm_msg_response msg_rejected,
void *ari, u8 ari_length)
{
struct ib_mad_send_buf *msg = NULL;
struct cm_rej_msg *rej_msg, *rcv_msg;
int ret;
ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
if (ret)
return ret;
/* We just need common CM header information. Cast to any message. */
rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad;
rej_msg = (struct cm_rej_msg *) msg->mad;
cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid);
rej_msg->remote_comm_id = rcv_msg->local_comm_id;
rej_msg->local_comm_id = rcv_msg->remote_comm_id;
cm_rej_set_msg_rejected(rej_msg, msg_rejected);
rej_msg->reason = cpu_to_be16(reason);
if (ari && ari_length) {
cm_rej_set_reject_info_len(rej_msg, ari_length);
memcpy(rej_msg->ari, ari, ari_length);
}
ret = ib_post_send_mad(msg, NULL);
if (ret)
cm_free_msg(msg);
return ret;
}
static inline int cm_is_active_peer(__be64 local_ca_guid, __be64 remote_ca_guid,
__be32 local_qpn, __be32 remote_qpn)
{
return (be64_to_cpu(local_ca_guid) > be64_to_cpu(remote_ca_guid) ||
((local_ca_guid == remote_ca_guid) &&
(be32_to_cpu(local_qpn) > be32_to_cpu(remote_qpn))));
}
static void cm_format_paths_from_req(struct cm_req_msg *req_msg,
struct ib_sa_path_rec *primary_path,
struct ib_sa_path_rec *alt_path)
{
memset(primary_path, 0, sizeof *primary_path);
primary_path->dgid = req_msg->primary_local_gid;
primary_path->sgid = req_msg->primary_remote_gid;
primary_path->dlid = req_msg->primary_local_lid;
primary_path->slid = req_msg->primary_remote_lid;
primary_path->flow_label = cm_req_get_primary_flow_label(req_msg);
primary_path->hop_limit = req_msg->primary_hop_limit;
primary_path->traffic_class = req_msg->primary_traffic_class;
primary_path->reversible = 1;
primary_path->pkey = req_msg->pkey;
primary_path->sl = cm_req_get_primary_sl(req_msg);
primary_path->mtu_selector = IB_SA_EQ;
primary_path->mtu = cm_req_get_path_mtu(req_msg);
primary_path->rate_selector = IB_SA_EQ;
primary_path->rate = cm_req_get_primary_packet_rate(req_msg);
primary_path->packet_life_time_selector = IB_SA_EQ;
primary_path->packet_life_time =
cm_req_get_primary_local_ack_timeout(req_msg);
primary_path->packet_life_time -= (primary_path->packet_life_time > 0);
if (req_msg->alt_local_lid) {
memset(alt_path, 0, sizeof *alt_path);
alt_path->dgid = req_msg->alt_local_gid;
alt_path->sgid = req_msg->alt_remote_gid;
alt_path->dlid = req_msg->alt_local_lid;
alt_path->slid = req_msg->alt_remote_lid;
alt_path->flow_label = cm_req_get_alt_flow_label(req_msg);
alt_path->hop_limit = req_msg->alt_hop_limit;
alt_path->traffic_class = req_msg->alt_traffic_class;
alt_path->reversible = 1;
alt_path->pkey = req_msg->pkey;
alt_path->sl = cm_req_get_alt_sl(req_msg);
alt_path->mtu_selector = IB_SA_EQ;
alt_path->mtu = cm_req_get_path_mtu(req_msg);
alt_path->rate_selector = IB_SA_EQ;
alt_path->rate = cm_req_get_alt_packet_rate(req_msg);
alt_path->packet_life_time_selector = IB_SA_EQ;
alt_path->packet_life_time =
cm_req_get_alt_local_ack_timeout(req_msg);
alt_path->packet_life_time -= (alt_path->packet_life_time > 0);
}
}
static void cm_format_req_event(struct cm_work *work,
struct cm_id_private *cm_id_priv,
struct ib_cm_id *listen_id)
{
struct cm_req_msg *req_msg;
struct ib_cm_req_event_param *param;
req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
param = &work->cm_event.param.req_rcvd;
param->listen_id = listen_id;
param->port = cm_id_priv->av.port->port_num;
param->primary_path = &work->path[0];
if (req_msg->alt_local_lid)
param->alternate_path = &work->path[1];
else
param->alternate_path = NULL;
param->remote_ca_guid = req_msg->local_ca_guid;
param->remote_qkey = be32_to_cpu(req_msg->local_qkey);
param->remote_qpn = be32_to_cpu(cm_req_get_local_qpn(req_msg));
param->qp_type = cm_req_get_qp_type(req_msg);
param->starting_psn = be32_to_cpu(cm_req_get_starting_psn(req_msg));
param->responder_resources = cm_req_get_init_depth(req_msg);
param->initiator_depth = cm_req_get_resp_res(req_msg);
param->local_cm_response_timeout =
cm_req_get_remote_resp_timeout(req_msg);
param->flow_control = cm_req_get_flow_ctrl(req_msg);
param->remote_cm_response_timeout =
cm_req_get_local_resp_timeout(req_msg);
param->retry_count = cm_req_get_retry_count(req_msg);
param->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
param->srq = cm_req_get_srq(req_msg);
work->cm_event.private_data = &req_msg->private_data;
}
static void cm_process_work(struct cm_id_private *cm_id_priv,
struct cm_work *work)
{
int ret;
/* We will typically only have the current event to report. */
ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event);
cm_free_work(work);
while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) {
spin_lock_irq(&cm_id_priv->lock);
work = cm_dequeue_work(cm_id_priv);
spin_unlock_irq(&cm_id_priv->lock);
BUG_ON(!work);
ret = cm_id_priv->id.cm_handler(&cm_id_priv->id,
&work->cm_event);
cm_free_work(work);
}
cm_deref_id(cm_id_priv);
if (ret)
cm_destroy_id(&cm_id_priv->id, ret);
}
static void cm_format_mra(struct cm_mra_msg *mra_msg,
struct cm_id_private *cm_id_priv,
enum cm_msg_response msg_mraed, u8 service_timeout,
const void *private_data, u8 private_data_len)
{
cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid);
cm_mra_set_msg_mraed(mra_msg, msg_mraed);
mra_msg->local_comm_id = cm_id_priv->id.local_id;
mra_msg->remote_comm_id = cm_id_priv->id.remote_id;
cm_mra_set_service_timeout(mra_msg, service_timeout);
if (private_data && private_data_len)
memcpy(mra_msg->private_data, private_data, private_data_len);
}
static void cm_format_rej(struct cm_rej_msg *rej_msg,
struct cm_id_private *cm_id_priv,
enum ib_cm_rej_reason reason,
void *ari,
u8 ari_length,
const void *private_data,
u8 private_data_len)
{
cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid);
rej_msg->remote_comm_id = cm_id_priv->id.remote_id;
switch(cm_id_priv->id.state) {
case IB_CM_REQ_RCVD:
rej_msg->local_comm_id = 0;
cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
break;
case IB_CM_MRA_REQ_SENT:
rej_msg->local_comm_id = cm_id_priv->id.local_id;
cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
break;
case IB_CM_REP_RCVD:
case IB_CM_MRA_REP_SENT:
rej_msg->local_comm_id = cm_id_priv->id.local_id;
cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REP);
break;
default:
rej_msg->local_comm_id = cm_id_priv->id.local_id;
cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_OTHER);
break;
}
rej_msg->reason = cpu_to_be16(reason);
if (ari && ari_length) {
cm_rej_set_reject_info_len(rej_msg, ari_length);
memcpy(rej_msg->ari, ari, ari_length);
}
if (private_data && private_data_len)
memcpy(rej_msg->private_data, private_data, private_data_len);
}
static void cm_dup_req_handler(struct cm_work *work,
struct cm_id_private *cm_id_priv)
{
struct ib_mad_send_buf *msg = NULL;
int ret;
atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
counter[CM_REQ_COUNTER]);
/* Quick state check to discard duplicate REQs. */
if (cm_id_priv->id.state == IB_CM_REQ_RCVD)
return;
ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
if (ret)
return;
spin_lock_irq(&cm_id_priv->lock);
switch (cm_id_priv->id.state) {
case IB_CM_MRA_REQ_SENT:
cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout,
cm_id_priv->private_data,
cm_id_priv->private_data_len);
break;
case IB_CM_TIMEWAIT:
cm_format_rej((struct cm_rej_msg *) msg->mad, cm_id_priv,
IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0);
break;
default:
goto unlock;
}
spin_unlock_irq(&cm_id_priv->lock);
ret = ib_post_send_mad(msg, NULL);
if (ret)
goto free;
return;
unlock: spin_unlock_irq(&cm_id_priv->lock);
free: cm_free_msg(msg);
}
static struct cm_id_private * cm_match_req(struct cm_work *work,
struct cm_id_private *cm_id_priv)
{
struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv;
struct cm_timewait_info *timewait_info;
struct cm_req_msg *req_msg;
req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
/* Check for possible duplicate REQ. */
spin_lock_irq(&cm.lock);
timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info);
if (timewait_info) {
cur_cm_id_priv = cm_get_id(timewait_info->work.local_id,
timewait_info->work.remote_id);
spin_unlock_irq(&cm.lock);
if (cur_cm_id_priv) {
cm_dup_req_handler(work, cur_cm_id_priv);
cm_deref_id(cur_cm_id_priv);
}
return NULL;
}
/* Check for stale connections. */
timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info);
if (timewait_info) {
cm_cleanup_timewait(cm_id_priv->timewait_info);
spin_unlock_irq(&cm.lock);
cm_issue_rej(work->port, work->mad_recv_wc,
IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ,
NULL, 0);
return NULL;
}
/* Find matching listen request. */
listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device,
req_msg->service_id,
req_msg->private_data);
if (!listen_cm_id_priv) {
cm_cleanup_timewait(cm_id_priv->timewait_info);
spin_unlock_irq(&cm.lock);
cm_issue_rej(work->port, work->mad_recv_wc,
IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ,
NULL, 0);
goto out;
}
atomic_inc(&listen_cm_id_priv->refcount);
atomic_inc(&cm_id_priv->refcount);
cm_id_priv->id.state = IB_CM_REQ_RCVD;
atomic_inc(&cm_id_priv->work_count);
spin_unlock_irq(&cm.lock);
out:
return listen_cm_id_priv;
}
/*
* Work-around for inter-subnet connections. If the LIDs are permissive,
* we need to override the LID/SL data in the REQ with the LID information
* in the work completion.
*/
static void cm_process_routed_req(struct cm_req_msg *req_msg, struct ib_wc *wc)
{
if (!cm_req_get_primary_subnet_local(req_msg)) {
if (req_msg->primary_local_lid == IB_LID_PERMISSIVE) {
req_msg->primary_local_lid = cpu_to_be16(wc->slid);
cm_req_set_primary_sl(req_msg, wc->sl);
}
if (req_msg->primary_remote_lid == IB_LID_PERMISSIVE)
req_msg->primary_remote_lid = cpu_to_be16(wc->dlid_path_bits);
}
if (!cm_req_get_alt_subnet_local(req_msg)) {
if (req_msg->alt_local_lid == IB_LID_PERMISSIVE) {
req_msg->alt_local_lid = cpu_to_be16(wc->slid);
cm_req_set_alt_sl(req_msg, wc->sl);
}
if (req_msg->alt_remote_lid == IB_LID_PERMISSIVE)
req_msg->alt_remote_lid = cpu_to_be16(wc->dlid_path_bits);
}
}
static int cm_req_handler(struct cm_work *work)
{
struct ib_cm_id *cm_id;
struct cm_id_private *cm_id_priv, *listen_cm_id_priv;
struct cm_req_msg *req_msg;
int ret;
req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL);
if (IS_ERR(cm_id))
return PTR_ERR(cm_id);
cm_id_priv = container_of(cm_id, struct cm_id_private, id);
cm_id_priv->id.remote_id = req_msg->local_comm_id;
cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
work->mad_recv_wc->recv_buf.grh,
&cm_id_priv->av);
cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
id.local_id);
if (IS_ERR(cm_id_priv->timewait_info)) {
ret = PTR_ERR(cm_id_priv->timewait_info);
goto destroy;
}
cm_id_priv->timewait_info->work.remote_id = req_msg->local_comm_id;
cm_id_priv->timewait_info->remote_ca_guid = req_msg->local_ca_guid;
cm_id_priv->timewait_info->remote_qpn = cm_req_get_local_qpn(req_msg);
listen_cm_id_priv = cm_match_req(work, cm_id_priv);
if (!listen_cm_id_priv) {
ret = -EINVAL;
kfree(cm_id_priv->timewait_info);
goto destroy;
}
cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler;
cm_id_priv->id.context = listen_cm_id_priv->id.context;
cm_id_priv->id.service_id = req_msg->service_id;
cm_id_priv->id.service_mask = ~cpu_to_be64(0);
cm_process_routed_req(req_msg, work->mad_recv_wc->wc);
cm_format_paths_from_req(req_msg, &work->path[0], &work->path[1]);
memcpy(work->path[0].dmac, cm_id_priv->av.ah_attr.dmac, ETH_ALEN);
work->path[0].vlan_id = cm_id_priv->av.ah_attr.vlan_id;
ret = cm_init_av_by_path(&work->path[0], &cm_id_priv->av);
if (ret) {
ib_get_cached_gid(work->port->cm_dev->ib_device,
work->port->port_num, 0, &work->path[0].sgid);
ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_GID,
&work->path[0].sgid, sizeof work->path[0].sgid,
NULL, 0);
goto rejected;
}
if (req_msg->alt_local_lid) {
ret = cm_init_av_by_path(&work->path[1], &cm_id_priv->alt_av);
if (ret) {
ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_ALT_GID,
&work->path[0].sgid,
sizeof work->path[0].sgid, NULL, 0);
goto rejected;
}
}
cm_id_priv->tid = req_msg->hdr.tid;
cm_id_priv->timeout_ms = cm_convert_to_ms(
cm_req_get_local_resp_timeout(req_msg));
cm_id_priv->max_cm_retries = cm_req_get_max_cm_retries(req_msg);
cm_id_priv->remote_qpn = cm_req_get_local_qpn(req_msg);
cm_id_priv->initiator_depth = cm_req_get_resp_res(req_msg);
cm_id_priv->responder_resources = cm_req_get_init_depth(req_msg);
cm_id_priv->path_mtu = cm_req_get_path_mtu(req_msg);
cm_id_priv->pkey = req_msg->pkey;
cm_id_priv->sq_psn = cm_req_get_starting_psn(req_msg);
cm_id_priv->retry_count = cm_req_get_retry_count(req_msg);
cm_id_priv->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
cm_id_priv->qp_type = cm_req_get_qp_type(req_msg);
cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id);
cm_process_work(cm_id_priv, work);
cm_deref_id(listen_cm_id_priv);
return 0;
rejected:
atomic_dec(&cm_id_priv->refcount);
cm_deref_id(listen_cm_id_priv);
destroy:
ib_destroy_cm_id(cm_id);
return ret;
}
static void cm_format_rep(struct cm_rep_msg *rep_msg,
struct cm_id_private *cm_id_priv,
struct ib_cm_rep_param *param)
{
cm_format_mad_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid);
rep_msg->local_comm_id = cm_id_priv->id.local_id;
rep_msg->remote_comm_id = cm_id_priv->id.remote_id;
cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn));
rep_msg->resp_resources = param->responder_resources;
cm_rep_set_target_ack_delay(rep_msg,
cm_id_priv->av.port->cm_dev->ack_delay);
cm_rep_set_failover(rep_msg, param->failover_accepted);
cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count);
rep_msg->local_ca_guid = cm_id_priv->id.device->node_guid;
if (cm_id_priv->qp_type != IB_QPT_XRC_TGT) {
rep_msg->initiator_depth = param->initiator_depth;
cm_rep_set_flow_ctrl(rep_msg, param->flow_control);
cm_rep_set_srq(rep_msg, param->srq);
cm_rep_set_local_qpn(rep_msg, cpu_to_be32(param->qp_num));
} else {
cm_rep_set_srq(rep_msg, 1);
cm_rep_set_local_eecn(rep_msg, cpu_to_be32(param->qp_num));
}
if (param->private_data && param->private_data_len)
memcpy(rep_msg->private_data, param->private_data,
param->private_data_len);
}
int ib_send_cm_rep(struct ib_cm_id *cm_id,
struct ib_cm_rep_param *param)
{
struct cm_id_private *cm_id_priv;
struct ib_mad_send_buf *msg;
struct cm_rep_msg *rep_msg;
unsigned long flags;
int ret;
if (param->private_data &&
param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE)
return -EINVAL;
cm_id_priv = container_of(cm_id, struct cm_id_private, id);
spin_lock_irqsave(&cm_id_priv->lock, flags);
if (cm_id->state != IB_CM_REQ_RCVD &&
cm_id->state != IB_CM_MRA_REQ_SENT) {
ret = -EINVAL;
goto out;
}
ret = cm_alloc_msg(cm_id_priv, &msg);
if (ret)
goto out;
rep_msg = (struct cm_rep_msg *) msg->mad;
cm_format_rep(rep_msg, cm_id_priv, param);
msg->timeout_ms = cm_id_priv->timeout_ms;
msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT;
ret = ib_post_send_mad(msg, NULL);
if (ret) {
spin_unlock_irqrestore(&cm_id_priv->lock, flags);
cm_free_msg(msg);
return ret;
}
cm_id->state = IB_CM_REP_SENT;
cm_id_priv->msg = msg;
cm_id_priv->initiator_depth = param->initiator_depth;
cm_id_priv->responder_resources = param->responder_resources;
cm_id_priv->rq_psn = cm_rep_get_starting_psn(rep_msg);
cm_id_priv->local_qpn = cpu_to_be32(param->qp_num & 0xFFFFFF);
out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
return ret;
}
EXPORT_SYMBOL(ib_send_cm_rep);
static void cm_format_rtu(struct cm_rtu_msg *rtu_msg,
struct cm_id_private *cm_id_priv,
const void *private_data,
u8 private_data_len)
{
cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid);
rtu_msg->local_comm_id = cm_id_priv->id.local_id;
rtu_msg->remote_comm_id = cm_id_priv->id.remote_id;
if (private_data && private_data_len)
memcpy(rtu_msg->private_data, private_data, private_data_len);
}
int ib_send_cm_rtu(struct ib_cm_id *cm_id,
const void *private_data,
u8 private_data_len)
{
struct cm_id_private *cm_id_priv;
struct ib_mad_send_buf *msg;
unsigned long flags;
void *data;
int ret;
if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE)
return -EINVAL;
data = cm_copy_private_data(private_data, private_data_len);
if (IS_ERR(data))
return PTR_ERR(data);
cm_id_priv = container_of(cm_id, struct cm_id_private, id);
spin_lock_irqsave(&cm_id_priv->lock, flags);
if (cm_id->state != IB_CM_REP_RCVD &&
cm_id->state != IB_CM_MRA_REP_SENT) {
ret = -EINVAL;
goto error;
}
ret = cm_alloc_msg(cm_id_priv, &msg);
if (ret)
goto error;
cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
private_data, private_data_len);
ret = ib_post_send_mad(msg, NULL);
if (ret) {
spin_unlock_irqrestore(&cm_id_priv->lock, flags);
cm_free_msg(msg);
kfree(data);
return ret;
}
cm_id->state = IB_CM_ESTABLISHED;
cm_set_private_data(cm_id_priv, data, private_data_len);
spin_unlock_irqrestore(&cm_id_priv->lock, flags);
return 0;
error: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
kfree(data);
return ret;
}
EXPORT_SYMBOL(ib_send_cm_rtu);
static void cm_format_rep_event(struct cm_work *work, enum ib_qp_type qp_type)
{
struct cm_rep_msg *rep_msg;
struct ib_cm_rep_event_param *param;
rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
param = &work->cm_event.param.rep_rcvd;
param->remote_ca_guid = rep_msg->local_ca_guid;
param->remote_qkey = be32_to_cpu(rep_msg->local_qkey);
param->remote_qpn = be32_to_cpu(cm_rep_get_qpn(rep_msg, qp_type));
param->starting_psn = be32_to_cpu(cm_rep_get_starting_psn(rep_msg));
param->responder_resources = rep_msg->initiator_depth;
param->initiator_depth = rep_msg->resp_resources;
param->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg);
param->failover_accepted = cm_rep_get_failover(rep_msg);
param->flow_control = cm_rep_get_flow_ctrl(rep_msg);
param->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
param->srq = cm_rep_get_srq(rep_msg);
work->cm_event.private_data = &rep_msg->private_data;
}
static void cm_dup_rep_handler(struct cm_work *work)
{
struct cm_id_private *cm_id_priv;
struct cm_rep_msg *rep_msg;
struct ib_mad_send_buf *msg = NULL;
int ret;
rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad;
cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id,
rep_msg->local_comm_id);
if (!cm_id_priv)
return;
atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
counter[CM_REP_COUNTER]);
ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
if (ret)
goto deref;
spin_lock_irq(&cm_id_priv->lock);
if (cm_id_priv->id.state == IB_CM_ESTABLISHED)
cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
cm_id_priv->private_data,
cm_id_priv->private_data_len);
else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT)
cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout,
cm_id_priv->private_data,
cm_id_priv->private_data_len);
else
goto unlock;
spin_unlock_irq(&cm_id_priv->lock);
ret = ib_post_send_mad(msg, NULL);
if (ret)
goto free;
goto deref;
unlock: spin_unlock_irq(&cm_id_priv->lock);
free: cm_free_msg(msg);
deref: cm_deref_id(cm_id_priv);
}
static int cm_rep_handler(struct cm_work *work)
{
struct cm_id_private *cm_id_priv;
struct cm_rep_msg *rep_msg;
int ret;
rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 0);
if (!cm_id_priv) {
cm_dup_rep_handler(work);
return -EINVAL;
}
cm_format_rep_event(work, cm_id_priv->qp_type);
spin_lock_irq(&cm_id_priv->lock);
switch (cm_id_priv->id.state) {
case IB_CM_REQ_SENT:
case IB_CM_MRA_REQ_RCVD:
break;
default:
spin_unlock_irq(&cm_id_priv->lock);
ret = -EINVAL;
goto error;
}
cm_id_priv->timewait_info->work.remote_id = rep_msg->local_comm_id;
cm_id_priv->timewait_info->remote_ca_guid = rep_msg->local_ca_guid;
cm_id_priv->timewait_info->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type);
spin_lock(&cm.lock);
/* Check for duplicate REP. */
if (cm_insert_remote_id(cm_id_priv->timewait_info)) {
spin_unlock(&cm.lock);
spin_unlock_irq(&cm_id_priv->lock);
ret = -EINVAL;
goto error;
}
/* Check for a stale connection. */
if (cm_insert_remote_qpn(cm_id_priv->timewait_info)) {
rb_erase(&cm_id_priv->timewait_info->remote_id_node,
&cm.remote_id_table);
cm_id_priv->timewait_info->inserted_remote_id = 0;
spin_unlock(&cm.lock);
spin_unlock_irq(&cm_id_priv->lock);
cm_issue_rej(work->port, work->mad_recv_wc,
IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP,
NULL, 0);
ret = -EINVAL;
goto error;
}
spin_unlock(&cm.lock);
cm_id_priv->id.state = IB_CM_REP_RCVD;
cm_id_priv->id.remote_id = rep_msg->local_comm_id;
cm_id_priv->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type);
cm_id_priv->initiator_depth = rep_msg->resp_resources;
cm_id_priv->responder_resources = rep_msg->initiator_depth;
cm_id_priv->sq_psn = cm_rep_get_starting_psn(rep_msg);
cm_id_priv->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
cm_id_priv->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg);
cm_id_priv->av.timeout =
cm_ack_timeout(cm_id_priv->target_ack_delay,
cm_id_priv->av.timeout - 1);
cm_id_priv->alt_av.timeout =
cm_ack_timeout(cm_id_priv->target_ack_delay,
cm_id_priv->alt_av.timeout - 1);
/* todo: handle peer_to_peer */
ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
ret = atomic_inc_and_test(&cm_id_priv->work_count);
if (!ret)
list_add_tail(&work->list, &cm_id_priv->work_list);
spin_unlock_irq(&cm_id_priv->lock);
if (ret)
cm_process_work(cm_id_priv, work);
else
cm_deref_id(cm_id_priv);
return 0;
error:
cm_deref_id(cm_id_priv);
return ret;
}
static int cm_establish_handler(struct cm_work *work)
{
struct cm_id_private *cm_id_priv;
int ret;
/* See comment in cm_establish about lookup. */
cm_id_priv = cm_acquire_id(work->local_id, work->remote_id);
if (!cm_id_priv)
return -EINVAL;
spin_lock_irq(&cm_id_priv->lock);
if (cm_id_priv->id.state != IB_CM_ESTABLISHED) {
spin_unlock_irq(&cm_id_priv->lock);
goto out;
}
ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
ret = atomic_inc_and_test(&cm_id_priv->work_count);
if (!ret)
list_add_tail(&work->list, &cm_id_priv->work_list);
spin_unlock_irq(&cm_id_priv->lock);
if (ret)
cm_process_work(cm_id_priv, work);
else
cm_deref_id(cm_id_priv);
return 0;
out:
cm_deref_id(cm_id_priv);
return -EINVAL;
}
static int cm_rtu_handler(struct cm_work *work)
{
struct cm_id_private *cm_id_priv;
struct cm_rtu_msg *rtu_msg;
int ret;
rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad;
cm_id_priv = cm_acquire_id(rtu_msg->remote_comm_id,
rtu_msg->local_comm_id);
if (!cm_id_priv)
return -EINVAL;
work->cm_event.private_data = &rtu_msg->private_data;
spin_lock_irq(&cm_id_priv->lock);
if (cm_id_priv->id.state != IB_CM_REP_SENT &&
cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) {
spin_unlock_irq(&cm_id_priv->lock);
atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
counter[CM_RTU_COUNTER]);
goto out;
}
cm_id_priv->id.state = IB_CM_ESTABLISHED;
ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
ret = atomic_inc_and_test(&cm_id_priv->work_count);
if (!ret)
list_add_tail(&work->list, &cm_id_priv->work_list);
spin_unlock_irq(&cm_id_priv->lock);
if (ret)
cm_process_work(cm_id_priv, work);
else
cm_deref_id(cm_id_priv);
return 0;
out:
cm_deref_id(cm_id_priv);
return -EINVAL;
}
static void cm_format_dreq(struct cm_dreq_msg *dreq_msg,
struct cm_id_private *cm_id_priv,
const void *private_data,
u8 private_data_len)
{
cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID,
cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_DREQ));
dreq_msg->local_comm_id = cm_id_priv->id.local_id;
dreq_msg->remote_comm_id = cm_id_priv->id.remote_id;
cm_dreq_set_remote_qpn(dreq_msg, cm_id_priv->remote_qpn);
if (private_data && private_data_len)
memcpy(dreq_msg->private_data, private_data, private_data_len);
}
int ib_send_cm_dreq(struct ib_cm_id *cm_id,
const void *private_data,
u8 private_data_len)
{
struct cm_id_private *cm_id_priv;
struct ib_mad_send_buf *msg;
unsigned long flags;
int ret;
if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE)
return -EINVAL;
cm_id_priv = container_of(cm_id, struct cm_id_private, id);
spin_lock_irqsave(&cm_id_priv->lock, flags);
if (cm_id->state != IB_CM_ESTABLISHED) {
ret = -EINVAL;
goto out;
}
if (cm_id->lap_state == IB_CM_LAP_SENT ||
cm_id->lap_state == IB_CM_MRA_LAP_RCVD)
ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
ret = cm_alloc_msg(cm_id_priv, &msg);
if (ret) {
cm_enter_timewait(cm_id_priv);
goto out;
}
cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv,
private_data, private_data_len);
msg->timeout_ms = cm_id_priv->timeout_ms;
msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT;
ret = ib_post_send_mad(msg, NULL);
if (ret) {
cm_enter_timewait(cm_id_priv);
spin_unlock_irqrestore(&cm_id_priv->lock, flags);
cm_free_msg(msg);
return ret;
}
cm_id->state = IB_CM_DREQ_SENT;
cm_id_priv->msg = msg;
out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
return ret;
}
EXPORT_SYMBOL(ib_send_cm_dreq);
static void cm_format_drep(struct cm_drep_msg *drep_msg,
struct cm_id_private *cm_id_priv,
const void *private_data,
u8 private_data_len)
{
cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid);
drep_msg->local_comm_id = cm_id_priv->id.local_id;
drep_msg->remote_comm_id = cm_id_priv->id.remote_id;
if (private_data && private_data_len)
memcpy(drep_msg->private_data, private_data, private_data_len);
}
int ib_send_cm_drep(struct ib_cm_id *cm_id,
const void *private_data,
u8 private_data_len)
{
struct cm_id_private *cm_id_priv;
struct ib_mad_send_buf *msg;
unsigned long flags;
void *data;
int ret;
if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE)
return -EINVAL;
data = cm_copy_private_data(private_data, private_data_len);
if (IS_ERR(data))
return PTR_ERR(data);
cm_id_priv = container_of(cm_id, struct cm_id_private, id);
spin_lock_irqsave(&cm_id_priv->lock, flags);
if (cm_id->state != IB_CM_DREQ_RCVD) {
spin_unlock_irqrestore(&cm_id_priv->lock, flags);
kfree(data);
return -EINVAL;
}
cm_set_private_data(cm_id_priv, data, private_data_len);
cm_enter_timewait(cm_id_priv);
ret = cm_alloc_msg(cm_id_priv, &msg);
if (ret)
goto out;
cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
private_data, private_data_len);
ret = ib_post_send_mad(msg, NULL);
if (ret) {
spin_unlock_irqrestore(&cm_id_priv->lock, flags);
cm_free_msg(msg);
return ret;
}
out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
return ret;
}
EXPORT_SYMBOL(ib_send_cm_drep);
static int cm_issue_drep(struct cm_port *port,
struct ib_mad_recv_wc *mad_recv_wc)
{
struct ib_mad_send_buf *msg = NULL;
struct cm_dreq_msg *dreq_msg;
struct cm_drep_msg *drep_msg;
int ret;
ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
if (ret)
return ret;
dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad;
drep_msg = (struct cm_drep_msg *) msg->mad;
cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, dreq_msg->hdr.tid);
drep_msg->remote_comm_id = dreq_msg->local_comm_id;
drep_msg->local_comm_id = dreq_msg->remote_comm_id;
ret = ib_post_send_mad(msg, NULL);
if (ret)
cm_free_msg(msg);
return ret;
}
static int cm_dreq_handler(struct cm_work *work)
{
struct cm_id_private *cm_id_priv;
struct cm_dreq_msg *dreq_msg;
struct ib_mad_send_buf *msg = NULL;
int ret;
dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad;
cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id,
dreq_msg->local_comm_id);
if (!cm_id_priv) {
atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
counter[CM_DREQ_COUNTER]);
cm_issue_drep(work->port, work->mad_recv_wc);
return -EINVAL;
}
work->cm_event.private_data = &dreq_msg->private_data;
spin_lock_irq(&cm_id_priv->lock);
if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg))
goto unlock;
switch (cm_id_priv->id.state) {
case IB_CM_REP_SENT:
case IB_CM_DREQ_SENT:
ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
break;
case IB_CM_ESTABLISHED:
if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT ||
cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD)
ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
break;
case IB_CM_MRA_REP_RCVD:
break;
case IB_CM_TIMEWAIT:
atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
counter[CM_DREQ_COUNTER]);
if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
goto unlock;
cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
cm_id_priv->private_data,
cm_id_priv->private_data_len);
spin_unlock_irq(&cm_id_priv->lock);
if (ib_post_send_mad(msg, NULL))
cm_free_msg(msg);
goto deref;
case IB_CM_DREQ_RCVD:
atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
counter[CM_DREQ_COUNTER]);
goto unlock;
default:
goto unlock;
}
cm_id_priv->id.state = IB_CM_DREQ_RCVD;
cm_id_priv->tid = dreq_msg->hdr.tid;
ret = atomic_inc_and_test(&cm_id_priv->work_count);
if (!ret)
list_add_tail(&work->list, &cm_id_priv->work_list);
spin_unlock_irq(&cm_id_priv->lock);
if (ret)
cm_process_work(cm_id_priv, work);
else
cm_deref_id(cm_id_priv);
return 0;
unlock: spin_unlock_irq(&cm_id_priv->lock);
deref: cm_deref_id(cm_id_priv);
return -EINVAL;
}
static int cm_drep_handler(struct cm_work *work)
{
struct cm_id_private *cm_id_priv;
struct cm_drep_msg *drep_msg;
int ret;
drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad;
cm_id_priv = cm_acquire_id(drep_msg->remote_comm_id,
drep_msg->local_comm_id);
if (!cm_id_priv)
return -EINVAL;
work->cm_event.private_data = &drep_msg->private_data;
spin_lock_irq(&cm_id_priv->lock);
if (cm_id_priv->id.state != IB_CM_DREQ_SENT &&
cm_id_priv->id.state != IB_CM_DREQ_RCVD) {
spin_unlock_irq(&cm_id_priv->lock);
goto out;
}
cm_enter_timewait(cm_id_priv);
ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
ret = atomic_inc_and_test(&cm_id_priv->work_count);
if (!ret)
list_add_tail(&work->list, &cm_id_priv->work_list);
spin_unlock_irq(&cm_id_priv->lock);
if (ret)
cm_process_work(cm_id_priv, work);
else
cm_deref_id(cm_id_priv);
return 0;
out:
cm_deref_id(cm_id_priv);
return -EINVAL;
}
int ib_send_cm_rej(struct ib_cm_id *cm_id,
enum ib_cm_rej_reason reason,
void *ari,
u8 ari_length,
const void *private_data,
u8 private_data_len)
{
struct cm_id_private *cm_id_priv;
struct ib_mad_send_buf *msg;
unsigned long flags;
int ret;
if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) ||
(ari && ari_length > IB_CM_REJ_ARI_LENGTH))
return -EINVAL;
cm_id_priv = container_of(cm_id, struct cm_id_private, id);
spin_lock_irqsave(&cm_id_priv->lock, flags);
switch (cm_id->state) {
case IB_CM_REQ_SENT:
case IB_CM_MRA_REQ_RCVD:
case IB_CM_REQ_RCVD:
case IB_CM_MRA_REQ_SENT:
case IB_CM_REP_RCVD:
case IB_CM_MRA_REP_SENT:
ret = cm_alloc_msg(cm_id_priv, &msg);
if (!ret)
cm_format_rej((struct cm_rej_msg *) msg->mad,
cm_id_priv, reason, ari, ari_length,
private_data, private_data_len);
cm_reset_to_idle(cm_id_priv);
break;
case IB_CM_REP_SENT:
case IB_CM_MRA_REP_RCVD:
ret = cm_alloc_msg(cm_id_priv, &msg);
if (!ret)
cm_format_rej((struct cm_rej_msg *) msg->mad,
cm_id_priv, reason, ari, ari_length,
private_data, private_data_len);
cm_enter_timewait(cm_id_priv);
break;
default:
ret = -EINVAL;
goto out;
}
if (ret)
goto out;
ret = ib_post_send_mad(msg, NULL);
if (ret)
cm_free_msg(msg);
out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
return ret;
}
EXPORT_SYMBOL(ib_send_cm_rej);
static void cm_format_rej_event(struct cm_work *work)
{
struct cm_rej_msg *rej_msg;
struct ib_cm_rej_event_param *param;
rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
param = &work->cm_event.param.rej_rcvd;
param->ari = rej_msg->ari;
param->ari_length = cm_rej_get_reject_info_len(rej_msg);
param->reason = __be16_to_cpu(rej_msg->reason);
work->cm_event.private_data = &rej_msg->private_data;
}
static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg)
{
struct cm_timewait_info *timewait_info;
struct cm_id_private *cm_id_priv;
__be32 remote_id;
remote_id = rej_msg->local_comm_id;
if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_TIMEOUT) {
spin_lock_irq(&cm.lock);
timewait_info = cm_find_remote_id( *((__be64 *) rej_msg->ari),
remote_id);
if (!timewait_info) {
spin_unlock_irq(&cm.lock);
return NULL;
}
cm_id_priv = idr_find(&cm.local_id_table, (__force int)
(timewait_info->work.local_id ^
cm.random_id_operand));
if (cm_id_priv) {
if (cm_id_priv->id.remote_id == remote_id)
atomic_inc(&cm_id_priv->refcount);
else
cm_id_priv = NULL;
}
spin_unlock_irq(&cm.lock);
} else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ)
cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0);
else
cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id);
return cm_id_priv;
}
static int cm_rej_handler(struct cm_work *work)
{
struct cm_id_private *cm_id_priv;
struct cm_rej_msg *rej_msg;
int ret;
rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
cm_id_priv = cm_acquire_rejected_id(rej_msg);
if (!cm_id_priv)
return -EINVAL;
cm_format_rej_event(work);
spin_lock_irq(&cm_id_priv->lock);
switch (cm_id_priv->id.state) {
case IB_CM_REQ_SENT:
case IB_CM_MRA_REQ_RCVD:
case IB_CM_REP_SENT:
case IB_CM_MRA_REP_RCVD:
ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
/* fall through */
case IB_CM_REQ_RCVD:
case IB_CM_MRA_REQ_SENT:
if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_STALE_CONN)
cm_enter_timewait(cm_id_priv);
else
cm_reset_to_idle(cm_id_priv);
break;
case IB_CM_DREQ_SENT:
ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
/* fall through */
case IB_CM_REP_RCVD:
case IB_CM_MRA_REP_SENT:
cm_enter_timewait(cm_id_priv);
break;
case IB_CM_ESTABLISHED:
if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT ||
cm_id_priv->id.lap_state == IB_CM_LAP_SENT) {
if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT)
ib_cancel_mad(cm_id_priv->av.port->mad_agent,
cm_id_priv->msg);
cm_enter_timewait(cm_id_priv);
break;
}
/* fall through */
default:
spin_unlock_irq(&cm_id_priv->lock);
ret = -EINVAL;
goto out;
}
ret = atomic_inc_and_test(&cm_id_priv->work_count);
if (!ret)
list_add_tail(&work->list, &cm_id_priv->work_list);
spin_unlock_irq(&cm_id_priv->lock);
if (ret)
cm_process_work(cm_id_priv, work);
else
cm_deref_id(cm_id_priv);
return 0;
out:
cm_deref_id(cm_id_priv);
return -EINVAL;
}
int ib_send_cm_mra(struct ib_cm_id *cm_id,
u8 service_timeout,
const void *private_data,
u8 private_data_len)
{
struct cm_id_private *cm_id_priv;
struct ib_mad_send_buf *msg;
enum ib_cm_state cm_state;
enum ib_cm_lap_state lap_state;
enum cm_msg_response msg_response;
void *data;
unsigned long flags;
int ret;
if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE)
return -EINVAL;
data = cm_copy_private_data(private_data, private_data_len);
if (IS_ERR(data))
return PTR_ERR(data);
cm_id_priv = container_of(cm_id, struct cm_id_private, id);
spin_lock_irqsave(&cm_id_priv->lock, flags);
switch(cm_id_priv->id.state) {
case IB_CM_REQ_RCVD:
cm_state = IB_CM_MRA_REQ_SENT;
lap_state = cm_id->lap_state;
msg_response = CM_MSG_RESPONSE_REQ;
break;
case IB_CM_REP_RCVD:
cm_state = IB_CM_MRA_REP_SENT;
lap_state = cm_id->lap_state;
msg_response = CM_MSG_RESPONSE_REP;
break;
case IB_CM_ESTABLISHED:
if (cm_id->lap_state == IB_CM_LAP_RCVD) {
cm_state = cm_id->state;
lap_state = IB_CM_MRA_LAP_SENT;
msg_response = CM_MSG_RESPONSE_OTHER;
break;
}
default:
ret = -EINVAL;
goto error1;
}
if (!(service_timeout & IB_CM_MRA_FLAG_DELAY)) {
ret = cm_alloc_msg(cm_id_priv, &msg);
if (ret)
goto error1;
cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
msg_response, service_timeout,
private_data, private_data_len);
ret = ib_post_send_mad(msg, NULL);
if (ret)
goto error2;
}
cm_id->state = cm_state;
cm_id->lap_state = lap_state;
cm_id_priv->service_timeout = service_timeout;
cm_set_private_data(cm_id_priv, data, private_data_len);
spin_unlock_irqrestore(&cm_id_priv->lock, flags);
return 0;
error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
kfree(data);
return ret;
error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
kfree(data);
cm_free_msg(msg);
return ret;
}
EXPORT_SYMBOL(ib_send_cm_mra);
static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg)
{
switch (cm_mra_get_msg_mraed(mra_msg)) {
case CM_MSG_RESPONSE_REQ:
return cm_acquire_id(mra_msg->remote_comm_id, 0);
case CM_MSG_RESPONSE_REP:
case CM_MSG_RESPONSE_OTHER:
return cm_acquire_id(mra_msg->remote_comm_id,
mra_msg->local_comm_id);
default:
return NULL;
}
}
static int cm_mra_handler(struct cm_work *work)
{
struct cm_id_private *cm_id_priv;
struct cm_mra_msg *mra_msg;
int timeout, ret;
mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad;
cm_id_priv = cm_acquire_mraed_id(mra_msg);
if (!cm_id_priv)
return -EINVAL;
work->cm_event.private_data = &mra_msg->private_data;
work->cm_event.param.mra_rcvd.service_timeout =
cm_mra_get_service_timeout(mra_msg);
timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) +
cm_convert_to_ms(cm_id_priv->av.timeout);
spin_lock_irq(&cm_id_priv->lock);
switch (cm_id_priv->id.state) {
case IB_CM_REQ_SENT:
if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ ||
ib_modify_mad(cm_id_priv->av.port->mad_agent,
cm_id_priv->msg, timeout))
goto out;
cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD;
break;
case IB_CM_REP_SENT:
if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP ||
ib_modify_mad(cm_id_priv->av.port->mad_agent,
cm_id_priv->msg, timeout))
goto out;
cm_id_priv->id.state = IB_CM_MRA_REP_RCVD;
break;
case IB_CM_ESTABLISHED:
if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER ||
cm_id_priv->id.lap_state != IB_CM_LAP_SENT ||
ib_modify_mad(cm_id_priv->av.port->mad_agent,
cm_id_priv->msg, timeout)) {
if (cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD)
atomic_long_inc(&work->port->
counter_group[CM_RECV_DUPLICATES].
counter[CM_MRA_COUNTER]);
goto out;
}
cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD;
break;
case IB_CM_MRA_REQ_RCVD:
case IB_CM_MRA_REP_RCVD:
atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
counter[CM_MRA_COUNTER]);
/* fall through */
default:
goto out;
}
cm_id_priv->msg->context[1] = (void *) (unsigned long)
cm_id_priv->id.state;
ret = atomic_inc_and_test(&cm_id_priv->work_count);
if (!ret)
list_add_tail(&work->list, &cm_id_priv->work_list);
spin_unlock_irq(&cm_id_priv->lock);
if (ret)
cm_process_work(cm_id_priv, work);
else
cm_deref_id(cm_id_priv);
return 0;
out:
spin_unlock_irq(&cm_id_priv->lock);
cm_deref_id(cm_id_priv);
return -EINVAL;
}
static void cm_format_lap(struct cm_lap_msg *lap_msg,
struct cm_id_private *cm_id_priv,
struct ib_sa_path_rec *alternate_path,
const void *private_data,
u8 private_data_len)
{
cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID,
cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_LAP));
lap_msg->local_comm_id = cm_id_priv->id.local_id;
lap_msg->remote_comm_id = cm_id_priv->id.remote_id;
cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn);
/* todo: need remote CM response timeout */
cm_lap_set_remote_resp_timeout(lap_msg, 0x1F);
lap_msg->alt_local_lid = alternate_path->slid;
lap_msg->alt_remote_lid = alternate_path->dlid;
lap_msg->alt_local_gid = alternate_path->sgid;
lap_msg->alt_remote_gid = alternate_path->dgid;
cm_lap_set_flow_label(lap_msg, alternate_path->flow_label);
cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class);
lap_msg->alt_hop_limit = alternate_path->hop_limit;
cm_lap_set_packet_rate(lap_msg, alternate_path->rate);
cm_lap_set_sl(lap_msg, alternate_path->sl);
cm_lap_set_subnet_local(lap_msg, 1); /* local only... */
cm_lap_set_local_ack_timeout(lap_msg,
cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
alternate_path->packet_life_time));
if (private_data && private_data_len)
memcpy(lap_msg->private_data, private_data, private_data_len);
}
int ib_send_cm_lap(struct ib_cm_id *cm_id,
struct ib_sa_path_rec *alternate_path,
const void *private_data,
u8 private_data_len)
{
struct cm_id_private *cm_id_priv;
struct ib_mad_send_buf *msg;
unsigned long flags;
int ret;
if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE)
return -EINVAL;
cm_id_priv = container_of(cm_id, struct cm_id_private, id);
spin_lock_irqsave(&cm_id_priv->lock, flags);
if (cm_id->state != IB_CM_ESTABLISHED ||
(cm_id->lap_state != IB_CM_LAP_UNINIT &&
cm_id->lap_state != IB_CM_LAP_IDLE)) {
ret = -EINVAL;
goto out;
}
ret = cm_init_av_by_path(alternate_path, &cm_id_priv->alt_av);
if (ret)
goto out;
cm_id_priv->alt_av.timeout =
cm_ack_timeout(cm_id_priv->target_ack_delay,
cm_id_priv->alt_av.timeout - 1);
ret = cm_alloc_msg(cm_id_priv, &msg);
if (ret)
goto out;
cm_format_lap((struct cm_lap_msg *) msg->mad, cm_id_priv,
alternate_path, private_data, private_data_len);
msg->timeout_ms = cm_id_priv->timeout_ms;