linux_dsm_epyc7002/drivers/infiniband/core/cm.c
Ted Kim c29ed5a456 ib/cm: Change reject message type when destroying cm_id
Problem reported by: Ted Kim <ted.h.kim@oracle.com>:

We have a case where a Linux system and a non-Linux system are
trying to interoperate.  The Linux host is the active side and
starts the connection establishment, but later decides to not go
through with the connection setup and does rdma_destroy_id().

The rdma_destroy_id() eventually works its way down to cm_destroy_id()
in core/cm.c, where a REJ is sent. The non-Linux system
has some trouble recognizing the REJ because of:

A. CM states which can't receive the REJ
B. Some issues about REJ formatting (missing comm ID)

ISSUE A: That part of the spec says, a Consumer Reject REJ can be
sent for a connection abort, but it goes further
and says: can send a REJ message with a "Consumer Reject"
Reason code if they are in a CM state (i.e. REP
Rcvd, MRA(REP) Sent, REQ Rcvd, MRA Sent) that allows
a REJ to be sent (lines 35-38).

Of the states listed there in that sentence, it would
seem to limit the active side to using the Consumer Reject
(for the abort case) in just the REP-Rcvd and MRA-REP-Sent
states. That is basically only after the active side
sees a REP (or alternatively goes down the state transitions
to timeout in which case a Timeout REJ is sent).

As a fix, in cm-destroy-id() move the IB-CM-MRA-REQ-RCVD case
to the same as REQ-SENT.  Essentially, make a REJ sent after
getting an MRA on active side a timeout rather than Consumer-
Reject, which is arguably more correct with the CM state
diagrams previous to getting a REP.

Signed-off-by: Ted Kim <ted.h.kim@oracle.com>
Signed-off-by: Sean Hefty <sean.hefty@intel.com>
2015-05-20 12:41:38 -04:00

3932 lines
108 KiB
C

/*
* 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(u32 *dst, const u32 *src, const u32 *mask)
{
int i;
for (i = 0; i < IB_CM_COMPARE_SIZE; i++)
dst[i] = src[i] & mask[i];
}
static int cm_compare_data(struct ib_cm_compare_data *src_data,
struct ib_cm_compare_data *dst_data)
{
u32 src[IB_CM_COMPARE_SIZE];
u32 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, sizeof(src));
}
static int cm_compare_private_data(u32 *private_data,
struct ib_cm_compare_data *dst_data)
{
u32 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, sizeof(src));
}
/*
* 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,
u32 *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:
case IB_CM_MRA_REQ_RCVD:
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_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,
sizeof(compare_data->mask));
}
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;
msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED;
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->lap_state = IB_CM_LAP_SENT;
cm_id_priv->msg = msg;
out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
return ret;
}
EXPORT_SYMBOL(ib_send_cm_lap);
static void cm_format_path_from_lap(struct cm_id_private *cm_id_priv,
struct ib_sa_path_rec *path,
struct cm_lap_msg *lap_msg)
{
memset(path, 0, sizeof *path);
path->dgid = lap_msg->alt_local_gid;
path->sgid = lap_msg->alt_remote_gid;
path->dlid = lap_msg->alt_local_lid;
path->slid = lap_msg->alt_remote_lid;
path->flow_label = cm_lap_get_flow_label(lap_msg);
path->hop_limit = lap_msg->alt_hop_limit;
path->traffic_class = cm_lap_get_traffic_class(lap_msg);
path->reversible = 1;
path->pkey = cm_id_priv->pkey;
path->sl = cm_lap_get_sl(lap_msg);
path->mtu_selector = IB_SA_EQ;
path->mtu = cm_id_priv->path_mtu;
path->rate_selector = IB_SA_EQ;
path->rate = cm_lap_get_packet_rate(lap_msg);
path->packet_life_time_selector = IB_SA_EQ;
path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg);
path->packet_life_time -= (path->packet_life_time > 0);
}
static int cm_lap_handler(struct cm_work *work)
{
struct cm_id_private *cm_id_priv;
struct cm_lap_msg *lap_msg;
struct ib_cm_lap_event_param *param;
struct ib_mad_send_buf *msg = NULL;
int ret;
/* todo: verify LAP request and send reject APR if invalid. */
lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad;
cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id,
lap_msg->local_comm_id);
if (!cm_id_priv)
return -EINVAL;
param = &work->cm_event.param.lap_rcvd;
param->alternate_path = &work->path[0];
cm_format_path_from_lap(cm_id_priv, param->alternate_path, lap_msg);
work->cm_event.private_data = &lap_msg->private_data;
spin_lock_irq(&cm_id_priv->lock);
if (cm_id_priv->id.state != IB_CM_ESTABLISHED)
goto unlock;
switch (cm_id_priv->id.lap_state) {
case IB_CM_LAP_UNINIT:
case IB_CM_LAP_IDLE:
break;
case IB_CM_MRA_LAP_SENT:
atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
counter[CM_LAP_COUNTER]);
if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
goto unlock;
cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
CM_MSG_RESPONSE_OTHER,
cm_id_priv->service_timeout,
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_LAP_RCVD:
atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
counter[CM_LAP_COUNTER]);
goto unlock;
default:
goto unlock;
}
cm_id_priv->id.lap_state = IB_CM_LAP_RCVD;
cm_id_priv->tid = lap_msg->hdr.tid;
cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
work->mad_recv_wc->recv_buf.grh,
&cm_id_priv->av);
cm_init_av_by_path(param->alternate_path, &cm_id_priv->alt_av);
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 void cm_format_apr(struct cm_apr_msg *apr_msg,
struct cm_id_private *cm_id_priv,
enum ib_cm_apr_status status,
void *info,
u8 info_length,
const void *private_data,
u8 private_data_len)
{
cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid);
apr_msg->local_comm_id = cm_id_priv->id.local_id;
apr_msg->remote_comm_id = cm_id_priv->id.remote_id;
apr_msg->ap_status = (u8) status;
if (info && info_length) {
apr_msg->info_length = info_length;
memcpy(apr_msg->info, info, info_length);
}
if (private_data && private_data_len)
memcpy(apr_msg->private_data, private_data, private_data_len);
}
int ib_send_cm_apr(struct ib_cm_id *cm_id,
enum ib_cm_apr_status status,
void *info,
u8 info_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_APR_PRIVATE_DATA_SIZE) ||
(info && info_length > IB_CM_APR_INFO_LENGTH))
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_RCVD &&
cm_id->lap_state != IB_CM_MRA_LAP_SENT)) {
ret = -EINVAL;
goto out;
}
ret = cm_alloc_msg(cm_id_priv, &msg);
if (ret)
goto out;
cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status,
info, info_length, 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;
}
cm_id->lap_state = IB_CM_LAP_IDLE;
out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
return ret;
}
EXPORT_SYMBOL(ib_send_cm_apr);
static int cm_apr_handler(struct cm_work *work)
{
struct cm_id_private *cm_id_priv;
struct cm_apr_msg *apr_msg;
int ret;
apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad;
cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id,
apr_msg->local_comm_id);
if (!cm_id_priv)
return -EINVAL; /* Unmatched reply. */
work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status;
work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info;
work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length;
work->cm_event.private_data = &apr_msg->private_data;
spin_lock_irq(&cm_id_priv->lock);
if (cm_id_priv->id.state != IB_CM_ESTABLISHED ||
(cm_id_priv->id.lap_state != IB_CM_LAP_SENT &&
cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) {
spin_unlock_irq(&cm_id_priv->lock);
goto out;
}
cm_id_priv->id.lap_state = IB_CM_LAP_IDLE;
ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
cm_id_priv->msg = NULL;
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_timewait_handler(struct cm_work *work)
{
struct cm_timewait_info *timewait_info;
struct cm_id_private *cm_id_priv;
int ret;
timewait_info = (struct cm_timewait_info *)work;
spin_lock_irq(&cm.lock);
list_del(&timewait_info->list);
spin_unlock_irq(&cm.lock);
cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
timewait_info->work.remote_id);
if (!cm_id_priv)
return -EINVAL;
spin_lock_irq(&cm_id_priv->lock);
if (cm_id_priv->id.state != IB_CM_TIMEWAIT ||
cm_id_priv->remote_qpn != timewait_info->remote_qpn) {
spin_unlock_irq(&cm_id_priv->lock);
goto out;
}
cm_id_priv->id.state = IB_CM_IDLE;
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_sidr_req(struct cm_sidr_req_msg *sidr_req_msg,
struct cm_id_private *cm_id_priv,
struct ib_cm_sidr_req_param *param)
{
cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID,
cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_SIDR));
sidr_req_msg->request_id = cm_id_priv->id.local_id;
sidr_req_msg->pkey = param->path->pkey;
sidr_req_msg->service_id = param->service_id;
if (param->private_data && param->private_data_len)
memcpy(sidr_req_msg->private_data, param->private_data,
param->private_data_len);
}
int ib_send_cm_sidr_req(struct ib_cm_id *cm_id,
struct ib_cm_sidr_req_param *param)
{
struct cm_id_private *cm_id_priv;
struct ib_mad_send_buf *msg;
unsigned long flags;
int ret;
if (!param->path || (param->private_data &&
param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE))
return -EINVAL;
cm_id_priv = container_of(cm_id, struct cm_id_private, id);
ret = cm_init_av_by_path(param->path, &cm_id_priv->av);
if (ret)
goto out;
cm_id->service_id = param->service_id;
cm_id->service_mask = ~cpu_to_be64(0);
cm_id_priv->timeout_ms = param->timeout_ms;
cm_id_priv->max_cm_retries = param->max_cm_retries;
ret = cm_alloc_msg(cm_id_priv, &msg);
if (ret)
goto out;
cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv,
param);
msg->timeout_ms = cm_id_priv->timeout_ms;
msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT;
spin_lock_irqsave(&cm_id_priv->lock, flags);
if (cm_id->state == IB_CM_IDLE)
ret = ib_post_send_mad(msg, NULL);
else
ret = -EINVAL;
if (ret) {
spin_unlock_irqrestore(&cm_id_priv->lock, flags);
cm_free_msg(msg);
goto out;
}
cm_id->state = IB_CM_SIDR_REQ_SENT;
cm_id_priv->msg = msg;
spin_unlock_irqrestore(&cm_id_priv->lock, flags);
out:
return ret;
}
EXPORT_SYMBOL(ib_send_cm_sidr_req);
static void cm_format_sidr_req_event(struct cm_work *work,
struct ib_cm_id *listen_id)
{
struct cm_sidr_req_msg *sidr_req_msg;
struct ib_cm_sidr_req_event_param *param;
sidr_req_msg = (struct cm_sidr_req_msg *)
work->mad_recv_wc->recv_buf.mad;
param = &work->cm_event.param.sidr_req_rcvd;
param->pkey = __be16_to_cpu(sidr_req_msg->pkey);
param->listen_id = listen_id;
param->port = work->port->port_num;
work->cm_event.private_data = &sidr_req_msg->private_data;
}
static int cm_sidr_req_handler(struct cm_work *work)
{
struct ib_cm_id *cm_id;
struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
struct cm_sidr_req_msg *sidr_req_msg;
struct ib_wc *wc;
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);
/* Record SGID/SLID and request ID for lookup. */
sidr_req_msg = (struct cm_sidr_req_msg *)
work->mad_recv_wc->recv_buf.mad;
wc = work->mad_recv_wc->wc;
cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid);
cm_id_priv->av.dgid.global.interface_id = 0;
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->id.remote_id = sidr_req_msg->request_id;
cm_id_priv->tid = sidr_req_msg->hdr.tid;
atomic_inc(&cm_id_priv->work_count);
spin_lock_irq(&cm.lock);
cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv);
if (cur_cm_id_priv) {
spin_unlock_irq(&cm.lock);
atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
counter[CM_SIDR_REQ_COUNTER]);
goto out; /* Duplicate message. */
}
cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD;
cur_cm_id_priv = cm_find_listen(cm_id->device,
sidr_req_msg->service_id,
sidr_req_msg->private_data);
if (!cur_cm_id_priv) {
spin_unlock_irq(&cm.lock);
cm_reject_sidr_req(cm_id_priv, IB_SIDR_UNSUPPORTED);
goto out; /* No match. */
}
atomic_inc(&cur_cm_id_priv->refcount);
atomic_inc(&cm_id_priv->refcount);
spin_unlock_irq(&cm.lock);
cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler;
cm_id_priv->id.context = cur_cm_id_priv->id.context;
cm_id_priv->id.service_id = sidr_req_msg->service_id;
cm_id_priv->id.service_mask = ~cpu_to_be64(0);
cm_format_sidr_req_event(work, &cur_cm_id_priv->id);
cm_process_work(cm_id_priv, work);
cm_deref_id(cur_cm_id_priv);
return 0;
out:
ib_destroy_cm_id(&cm_id_priv->id);
return -EINVAL;
}
static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg,
struct cm_id_private *cm_id_priv,
struct ib_cm_sidr_rep_param *param)
{
cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID,
cm_id_priv->tid);
sidr_rep_msg->request_id = cm_id_priv->id.remote_id;
sidr_rep_msg->status = param->status;
cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num));
sidr_rep_msg->service_id = cm_id_priv->id.service_id;
sidr_rep_msg->qkey = cpu_to_be32(param->qkey);
if (param->info && param->info_length)
memcpy(sidr_rep_msg->info, param->info, param->info_length);
if (param->private_data && param->private_data_len)
memcpy(sidr_rep_msg->private_data, param->private_data,
param->private_data_len);
}
int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id,
struct ib_cm_sidr_rep_param *param)
{
struct cm_id_private *cm_id_priv;
struct ib_mad_send_buf *msg;
unsigned long flags;
int ret;
if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) ||
(param->private_data &&
param->private_data_len > IB_CM_SIDR_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_SIDR_REQ_RCVD) {
ret = -EINVAL;
goto error;
}
ret = cm_alloc_msg(cm_id_priv, &msg);
if (ret)
goto error;
cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv,
param);
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_IDLE;
spin_unlock_irqrestore(&cm_id_priv->lock, flags);
spin_lock_irqsave(&cm.lock, flags);
rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
spin_unlock_irqrestore(&cm.lock, flags);
return 0;
error: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
return ret;
}
EXPORT_SYMBOL(ib_send_cm_sidr_rep);
static void cm_format_sidr_rep_event(struct cm_work *work)
{
struct cm_sidr_rep_msg *sidr_rep_msg;
struct ib_cm_sidr_rep_event_param *param;
sidr_rep_msg = (struct cm_sidr_rep_msg *)
work->mad_recv_wc->recv_buf.mad;
param = &work->cm_event.param.sidr_rep_rcvd;
param->status = sidr_rep_msg->status;
param->qkey = be32_to_cpu(sidr_rep_msg->qkey);
param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg));
param->info = &sidr_rep_msg->info;
param->info_len = sidr_rep_msg->info_length;
work->cm_event.private_data = &sidr_rep_msg->private_data;
}
static int cm_sidr_rep_handler(struct cm_work *work)
{
struct cm_sidr_rep_msg *sidr_rep_msg;
struct cm_id_private *cm_id_priv;
sidr_rep_msg = (struct cm_sidr_rep_msg *)
work->mad_recv_wc->recv_buf.mad;
cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0);
if (!cm_id_priv)
return -EINVAL; /* Unmatched reply. */
spin_lock_irq(&cm_id_priv->lock);
if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) {
spin_unlock_irq(&cm_id_priv->lock);
goto out;
}
cm_id_priv->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);
cm_format_sidr_rep_event(work);
cm_process_work(cm_id_priv, work);
return 0;
out:
cm_deref_id(cm_id_priv);
return -EINVAL;
}
static void cm_process_send_error(struct ib_mad_send_buf *msg,
enum ib_wc_status wc_status)
{
struct cm_id_private *cm_id_priv;
struct ib_cm_event cm_event;
enum ib_cm_state state;
int ret;
memset(&cm_event, 0, sizeof cm_event);
cm_id_priv = msg->context[0];
/* Discard old sends or ones without a response. */
spin_lock_irq(&cm_id_priv->lock);
state = (enum ib_cm_state) (unsigned long) msg->context[1];
if (msg != cm_id_priv->msg || state != cm_id_priv->id.state)
goto discard;
switch (state) {
case IB_CM_REQ_SENT:
case IB_CM_MRA_REQ_RCVD:
cm_reset_to_idle(cm_id_priv);
cm_event.event = IB_CM_REQ_ERROR;
break;
case IB_CM_REP_SENT:
case IB_CM_MRA_REP_RCVD:
cm_reset_to_idle(cm_id_priv);
cm_event.event = IB_CM_REP_ERROR;
break;
case IB_CM_DREQ_SENT:
cm_enter_timewait(cm_id_priv);
cm_event.event = IB_CM_DREQ_ERROR;
break;
case IB_CM_SIDR_REQ_SENT:
cm_id_priv->id.state = IB_CM_IDLE;
cm_event.event = IB_CM_SIDR_REQ_ERROR;
break;
default:
goto discard;
}
spin_unlock_irq(&cm_id_priv->lock);
cm_event.param.send_status = wc_status;
/* No other events can occur on the cm_id at this point. */
ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event);
cm_free_msg(msg);
if (ret)
ib_destroy_cm_id(&cm_id_priv->id);
return;
discard:
spin_unlock_irq(&cm_id_priv->lock);
cm_free_msg(msg);
}
static void cm_send_handler(struct ib_mad_agent *mad_agent,
struct ib_mad_send_wc *mad_send_wc)
{
struct ib_mad_send_buf *msg = mad_send_wc->send_buf;
struct cm_port *port;
u16 attr_index;
port = mad_agent->context;
attr_index = be16_to_cpu(((struct ib_mad_hdr *)
msg->mad)->attr_id) - CM_ATTR_ID_OFFSET;
/*
* If the send was in response to a received message (context[0] is not
* set to a cm_id), and is not a REJ, then it is a send that was
* manually retried.
*/
if (!msg->context[0] && (attr_index != CM_REJ_COUNTER))
msg->retries = 1;
atomic_long_add(1 + msg->retries,
&port->counter_group[CM_XMIT].counter[attr_index]);
if (msg->retries)
atomic_long_add(msg->retries,
&port->counter_group[CM_XMIT_RETRIES].
counter[attr_index]);
switch (mad_send_wc->status) {
case IB_WC_SUCCESS:
case IB_WC_WR_FLUSH_ERR:
cm_free_msg(msg);
break;
default:
if (msg->context[0] && msg->context[1])
cm_process_send_error(msg, mad_send_wc->status);
else
cm_free_msg(msg);
break;
}
}
static void cm_work_handler(struct work_struct *_work)
{
struct cm_work *work = container_of(_work, struct cm_work, work.work);
int ret;
switch (work->cm_event.event) {
case IB_CM_REQ_RECEIVED:
ret = cm_req_handler(work);
break;
case IB_CM_MRA_RECEIVED:
ret = cm_mra_handler(work);
break;
case IB_CM_REJ_RECEIVED:
ret = cm_rej_handler(work);
break;
case IB_CM_REP_RECEIVED:
ret = cm_rep_handler(work);
break;
case IB_CM_RTU_RECEIVED:
ret = cm_rtu_handler(work);
break;
case IB_CM_USER_ESTABLISHED:
ret = cm_establish_handler(work);
break;
case IB_CM_DREQ_RECEIVED:
ret = cm_dreq_handler(work);
break;
case IB_CM_DREP_RECEIVED:
ret = cm_drep_handler(work);
break;
case IB_CM_SIDR_REQ_RECEIVED:
ret = cm_sidr_req_handler(work);
break;
case IB_CM_SIDR_REP_RECEIVED:
ret = cm_sidr_rep_handler(work);
break;
case IB_CM_LAP_RECEIVED:
ret = cm_lap_handler(work);
break;
case IB_CM_APR_RECEIVED:
ret = cm_apr_handler(work);
break;
case IB_CM_TIMEWAIT_EXIT:
ret = cm_timewait_handler(work);
break;
default:
ret = -EINVAL;
break;
}
if (ret)
cm_free_work(work);
}
static int cm_establish(struct ib_cm_id *cm_id)
{
struct cm_id_private *cm_id_priv;
struct cm_work *work;
unsigned long flags;
int ret = 0;
work = kmalloc(sizeof *work, GFP_ATOMIC);
if (!work)
return -ENOMEM;
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_REP_SENT:
case IB_CM_MRA_REP_RCVD:
cm_id->state = IB_CM_ESTABLISHED;
break;
case IB_CM_ESTABLISHED:
ret = -EISCONN;
break;
default:
ret = -EINVAL;
break;
}
spin_unlock_irqrestore(&cm_id_priv->lock, flags);
if (ret) {
kfree(work);
goto out;
}
/*
* The CM worker thread may try to destroy the cm_id before it
* can execute this work item. To prevent potential deadlock,
* we need to find the cm_id once we're in the context of the
* worker thread, rather than holding a reference on it.
*/
INIT_DELAYED_WORK(&work->work, cm_work_handler);
work->local_id = cm_id->local_id;
work->remote_id = cm_id->remote_id;
work->mad_recv_wc = NULL;
work->cm_event.event = IB_CM_USER_ESTABLISHED;
queue_delayed_work(cm.wq, &work->work, 0);
out:
return ret;
}
static int cm_migrate(struct ib_cm_id *cm_id)
{
struct cm_id_private *cm_id_priv;
unsigned long flags;
int ret = 0;
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)) {
cm_id->lap_state = IB_CM_LAP_IDLE;
cm_id_priv->av = cm_id_priv->alt_av;
} else
ret = -EINVAL;
spin_unlock_irqrestore(&cm_id_priv->lock, flags);
return ret;
}
int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event)
{
int ret;
switch (event) {
case IB_EVENT_COMM_EST:
ret = cm_establish(cm_id);
break;
case IB_EVENT_PATH_MIG:
ret = cm_migrate(cm_id);
break;
default:
ret = -EINVAL;
}
return ret;
}
EXPORT_SYMBOL(ib_cm_notify);
static void cm_recv_handler(struct ib_mad_agent *mad_agent,
struct ib_mad_recv_wc *mad_recv_wc)
{
struct cm_port *port = mad_agent->context;
struct cm_work *work;
enum ib_cm_event_type event;
u16 attr_id;
int paths = 0;
switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) {
case CM_REQ_ATTR_ID:
paths = 1 + (((struct cm_req_msg *) mad_recv_wc->recv_buf.mad)->
alt_local_lid != 0);
event = IB_CM_REQ_RECEIVED;
break;
case CM_MRA_ATTR_ID:
event = IB_CM_MRA_RECEIVED;
break;
case CM_REJ_ATTR_ID:
event = IB_CM_REJ_RECEIVED;
break;
case CM_REP_ATTR_ID:
event = IB_CM_REP_RECEIVED;
break;
case CM_RTU_ATTR_ID:
event = IB_CM_RTU_RECEIVED;
break;
case CM_DREQ_ATTR_ID:
event = IB_CM_DREQ_RECEIVED;
break;
case CM_DREP_ATTR_ID:
event = IB_CM_DREP_RECEIVED;
break;
case CM_SIDR_REQ_ATTR_ID:
event = IB_CM_SIDR_REQ_RECEIVED;
break;
case CM_SIDR_REP_ATTR_ID:
event = IB_CM_SIDR_REP_RECEIVED;
break;
case CM_LAP_ATTR_ID:
paths = 1;
event = IB_CM_LAP_RECEIVED;
break;
case CM_APR_ATTR_ID:
event = IB_CM_APR_RECEIVED;
break;
default:
ib_free_recv_mad(mad_recv_wc);
return;
}
attr_id = be16_to_cpu(mad_recv_wc->recv_buf.mad->mad_hdr.attr_id);
atomic_long_inc(&port->counter_group[CM_RECV].
counter[attr_id - CM_ATTR_ID_OFFSET]);
work = kmalloc(sizeof *work + sizeof(struct ib_sa_path_rec) * paths,
GFP_KERNEL);
if (!work) {
ib_free_recv_mad(mad_recv_wc);
return;
}
INIT_DELAYED_WORK(&work->work, cm_work_handler);
work->cm_event.event = event;
work->mad_recv_wc = mad_recv_wc;
work->port = port;
queue_delayed_work(cm.wq, &work->work, 0);
}
static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv,
struct ib_qp_attr *qp_attr,
int *qp_attr_mask)
{
unsigned long flags;
int ret;
spin_lock_irqsave(&cm_id_priv->lock, flags);
switch (cm_id_priv->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:
case IB_CM_REP_SENT:
case IB_CM_MRA_REP_RCVD:
case IB_CM_ESTABLISHED:
*qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS |
IB_QP_PKEY_INDEX | IB_QP_PORT;
qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE;
if (cm_id_priv->responder_resources)
qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ |
IB_ACCESS_REMOTE_ATOMIC;
qp_attr->pkey_index = cm_id_priv->av.pkey_index;
qp_attr->port_num = cm_id_priv->av.port->port_num;
ret = 0;
break;
default:
ret = -EINVAL;
break;
}
spin_unlock_irqrestore(&cm_id_priv->lock, flags);
return ret;
}
static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv,
struct ib_qp_attr *qp_attr,
int *qp_attr_mask)
{
unsigned long flags;
int ret;
spin_lock_irqsave(&cm_id_priv->lock, flags);
switch (cm_id_priv->id.state) {
case IB_CM_REQ_RCVD:
case IB_CM_MRA_REQ_SENT:
case IB_CM_REP_RCVD:
case IB_CM_MRA_REP_SENT:
case IB_CM_REP_SENT:
case IB_CM_MRA_REP_RCVD:
case IB_CM_ESTABLISHED:
*qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU |
IB_QP_DEST_QPN | IB_QP_RQ_PSN;
qp_attr->ah_attr = cm_id_priv->av.ah_attr;
if (!cm_id_priv->av.valid) {
spin_unlock_irqrestore(&cm_id_priv->lock, flags);
return -EINVAL;
}
if (cm_id_priv->av.ah_attr.vlan_id != 0xffff) {
qp_attr->vlan_id = cm_id_priv->av.ah_attr.vlan_id;
*qp_attr_mask |= IB_QP_VID;
}
if (!is_zero_ether_addr(cm_id_priv->av.smac)) {
memcpy(qp_attr->smac, cm_id_priv->av.smac,
sizeof(qp_attr->smac));
*qp_attr_mask |= IB_QP_SMAC;
}
if (cm_id_priv->alt_av.valid) {
if (cm_id_priv->alt_av.ah_attr.vlan_id != 0xffff) {
qp_attr->alt_vlan_id =
cm_id_priv->alt_av.ah_attr.vlan_id;
*qp_attr_mask |= IB_QP_ALT_VID;
}
if (!is_zero_ether_addr(cm_id_priv->alt_av.smac)) {
memcpy(qp_attr->alt_smac,
cm_id_priv->alt_av.smac,
sizeof(qp_attr->alt_smac));
*qp_attr_mask |= IB_QP_ALT_SMAC;
}
}
qp_attr->path_mtu = cm_id_priv->path_mtu;
qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn);
qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn);
if (cm_id_priv->qp_type == IB_QPT_RC ||
cm_id_priv->qp_type == IB_QPT_XRC_TGT) {
*qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC |
IB_QP_MIN_RNR_TIMER;
qp_attr->max_dest_rd_atomic =
cm_id_priv->responder_resources;
qp_attr->min_rnr_timer = 0;
}
if (cm_id_priv->alt_av.ah_attr.dlid) {
*qp_attr_mask |= IB_QP_ALT_PATH;
qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
qp_attr->alt_timeout = cm_id_priv->alt_av.timeout;
qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
}
ret = 0;
break;
default:
ret = -EINVAL;
break;
}
spin_unlock_irqrestore(&cm_id_priv->lock, flags);
return ret;
}
static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv,
struct ib_qp_attr *qp_attr,
int *qp_attr_mask)
{
unsigned long flags;
int ret;
spin_lock_irqsave(&cm_id_priv->lock, flags);
switch (cm_id_priv->id.state) {
/* Allow transition to RTS before sending REP */
case IB_CM_REQ_RCVD:
case IB_CM_MRA_REQ_SENT:
case IB_CM_REP_RCVD:
case IB_CM_MRA_REP_SENT:
case IB_CM_REP_SENT:
case IB_CM_MRA_REP_RCVD:
case IB_CM_ESTABLISHED:
if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT) {
*qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN;
qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn);
switch (cm_id_priv->qp_type) {
case IB_QPT_RC:
case IB_QPT_XRC_INI:
*qp_attr_mask |= IB_QP_RETRY_CNT | IB_QP_RNR_RETRY |
IB_QP_MAX_QP_RD_ATOMIC;
qp_attr->retry_cnt = cm_id_priv->retry_count;
qp_attr->rnr_retry = cm_id_priv->rnr_retry_count;
qp_attr->max_rd_atomic = cm_id_priv->initiator_depth;
/* fall through */
case IB_QPT_XRC_TGT:
*qp_attr_mask |= IB_QP_TIMEOUT;
qp_attr->timeout = cm_id_priv->av.timeout;
break;
default:
break;
}
if (cm_id_priv->alt_av.ah_attr.dlid) {
*qp_attr_mask |= IB_QP_PATH_MIG_STATE;
qp_attr->path_mig_state = IB_MIG_REARM;
}
} else {
*qp_attr_mask = IB_QP_ALT_PATH | IB_QP_PATH_MIG_STATE;
qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
qp_attr->alt_timeout = cm_id_priv->alt_av.timeout;
qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
qp_attr->path_mig_state = IB_MIG_REARM;
}
ret = 0;
break;
default:
ret = -EINVAL;
break;
}
spin_unlock_irqrestore(&cm_id_priv->lock, flags);
return ret;
}
int ib_cm_init_qp_attr(struct ib_cm_id *cm_id,
struct ib_qp_attr *qp_attr,
int *qp_attr_mask)
{
struct cm_id_private *cm_id_priv;
int ret;
cm_id_priv = container_of(cm_id, struct cm_id_private, id);
switch (qp_attr->qp_state) {
case IB_QPS_INIT:
ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask);
break;
case IB_QPS_RTR:
ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask);
break;
case IB_QPS_RTS:
ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask);
break;
default:
ret = -EINVAL;
break;
}
return ret;
}
EXPORT_SYMBOL(ib_cm_init_qp_attr);
static void cm_get_ack_delay(struct cm_device *cm_dev)
{
struct ib_device_attr attr;
if (ib_query_device(cm_dev->ib_device, &attr))
cm_dev->ack_delay = 0; /* acks will rely on packet life time */
else
cm_dev->ack_delay = attr.local_ca_ack_delay;
}
static ssize_t cm_show_counter(struct kobject *obj, struct attribute *attr,
char *buf)
{
struct cm_counter_group *group;
struct cm_counter_attribute *cm_attr;
group = container_of(obj, struct cm_counter_group, obj);
cm_attr = container_of(attr, struct cm_counter_attribute, attr);
return sprintf(buf, "%ld\n",
atomic_long_read(&group->counter[cm_attr->index]));
}
static const struct sysfs_ops cm_counter_ops = {
.show = cm_show_counter
};
static struct kobj_type cm_counter_obj_type = {
.sysfs_ops = &cm_counter_ops,
.default_attrs = cm_counter_default_attrs
};
static void cm_release_port_obj(struct kobject *obj)
{
struct cm_port *cm_port;
cm_port = container_of(obj, struct cm_port, port_obj);
kfree(cm_port);
}
static struct kobj_type cm_port_obj_type = {
.release = cm_release_port_obj
};
static char *cm_devnode(struct device *dev, umode_t *mode)
{
if (mode)
*mode = 0666;
return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
}
struct class cm_class = {
.owner = THIS_MODULE,
.name = "infiniband_cm",
.devnode = cm_devnode,
};
EXPORT_SYMBOL(cm_class);
static int cm_create_port_fs(struct cm_port *port)
{
int i, ret;
ret = kobject_init_and_add(&port->port_obj, &cm_port_obj_type,
&port->cm_dev->device->kobj,
"%d", port->port_num);
if (ret) {
kfree(port);
return ret;
}
for (i = 0; i < CM_COUNTER_GROUPS; i++) {
ret = kobject_init_and_add(&port->counter_group[i].obj,
&cm_counter_obj_type,
&port->port_obj,
"%s", counter_group_names[i]);
if (ret)
goto error;
}
return 0;
error:
while (i--)
kobject_put(&port->counter_group[i].obj);
kobject_put(&port->port_obj);
return ret;
}
static void cm_remove_port_fs(struct cm_port *port)
{
int i;
for (i = 0; i < CM_COUNTER_GROUPS; i++)
kobject_put(&port->counter_group[i].obj);
kobject_put(&port->port_obj);
}
static void cm_add_one(struct ib_device *ib_device)
{
struct cm_device *cm_dev;
struct cm_port *port;
struct ib_mad_reg_req reg_req = {
.mgmt_class = IB_MGMT_CLASS_CM,
.mgmt_class_version = IB_CM_CLASS_VERSION,
};
struct ib_port_modify port_modify = {
.set_port_cap_mask = IB_PORT_CM_SUP
};
unsigned long flags;
int ret;
u8 i;
if (rdma_node_get_transport(ib_device->node_type) != RDMA_TRANSPORT_IB)
return;
cm_dev = kzalloc(sizeof(*cm_dev) + sizeof(*port) *
ib_device->phys_port_cnt, GFP_KERNEL);
if (!cm_dev)
return;
cm_dev->ib_device = ib_device;
cm_get_ack_delay(cm_dev);
cm_dev->device = device_create(&cm_class, &ib_device->dev,
MKDEV(0, 0), NULL,
"%s", ib_device->name);
if (IS_ERR(cm_dev->device)) {
kfree(cm_dev);
return;
}
set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask);
for (i = 1; i <= ib_device->phys_port_cnt; i++) {
port = kzalloc(sizeof *port, GFP_KERNEL);
if (!port)
goto error1;
cm_dev->port[i-1] = port;
port->cm_dev = cm_dev;
port->port_num = i;
ret = cm_create_port_fs(port);
if (ret)
goto error1;
port->mad_agent = ib_register_mad_agent(ib_device, i,
IB_QPT_GSI,
&reg_req,
0,
cm_send_handler,
cm_recv_handler,
port,
0);
if (IS_ERR(port->mad_agent))
goto error2;
ret = ib_modify_port(ib_device, i, 0, &port_modify);
if (ret)
goto error3;
}
ib_set_client_data(ib_device, &cm_client, cm_dev);
write_lock_irqsave(&cm.device_lock, flags);
list_add_tail(&cm_dev->list, &cm.device_list);
write_unlock_irqrestore(&cm.device_lock, flags);
return;
error3:
ib_unregister_mad_agent(port->mad_agent);
error2:
cm_remove_port_fs(port);
error1:
port_modify.set_port_cap_mask = 0;
port_modify.clr_port_cap_mask = IB_PORT_CM_SUP;
while (--i) {
port = cm_dev->port[i-1];
ib_modify_port(ib_device, port->port_num, 0, &port_modify);
ib_unregister_mad_agent(port->mad_agent);
cm_remove_port_fs(port);
}
device_unregister(cm_dev->device);
kfree(cm_dev);
}
static void cm_remove_one(struct ib_device *ib_device)
{
struct cm_device *cm_dev;
struct cm_port *port;
struct ib_port_modify port_modify = {
.clr_port_cap_mask = IB_PORT_CM_SUP
};
unsigned long flags;
int i;
cm_dev = ib_get_client_data(ib_device, &cm_client);
if (!cm_dev)
return;
write_lock_irqsave(&cm.device_lock, flags);
list_del(&cm_dev->list);
write_unlock_irqrestore(&cm.device_lock, flags);
for (i = 1; i <= ib_device->phys_port_cnt; i++) {
port = cm_dev->port[i-1];
ib_modify_port(ib_device, port->port_num, 0, &port_modify);
ib_unregister_mad_agent(port->mad_agent);
flush_workqueue(cm.wq);
cm_remove_port_fs(port);
}
device_unregister(cm_dev->device);
kfree(cm_dev);
}
static int __init ib_cm_init(void)
{
int ret;
memset(&cm, 0, sizeof cm);
INIT_LIST_HEAD(&cm.device_list);
rwlock_init(&cm.device_lock);
spin_lock_init(&cm.lock);
cm.listen_service_table = RB_ROOT;
cm.listen_service_id = be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID);
cm.remote_id_table = RB_ROOT;
cm.remote_qp_table = RB_ROOT;
cm.remote_sidr_table = RB_ROOT;
idr_init(&cm.local_id_table);
get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand);
INIT_LIST_HEAD(&cm.timewait_list);
ret = class_register(&cm_class);
if (ret) {
ret = -ENOMEM;
goto error1;
}
cm.wq = create_workqueue("ib_cm");
if (!cm.wq) {
ret = -ENOMEM;
goto error2;
}
ret = ib_register_client(&cm_client);
if (ret)
goto error3;
return 0;
error3:
destroy_workqueue(cm.wq);
error2:
class_unregister(&cm_class);
error1:
idr_destroy(&cm.local_id_table);
return ret;
}
static void __exit ib_cm_cleanup(void)
{
struct cm_timewait_info *timewait_info, *tmp;
spin_lock_irq(&cm.lock);
list_for_each_entry(timewait_info, &cm.timewait_list, list)
cancel_delayed_work(&timewait_info->work.work);
spin_unlock_irq(&cm.lock);
ib_unregister_client(&cm_client);
destroy_workqueue(cm.wq);
list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) {
list_del(&timewait_info->list);
kfree(timewait_info);
}
class_unregister(&cm_class);
idr_destroy(&cm.local_id_table);
}
module_init(ib_cm_init);
module_exit(ib_cm_cleanup);