--- /dev/null
+/*
+ * Copyright (c) 2004, 2005 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.
+ *
+ * $Id: cm.c 2821 2005-07-08 17:07:28Z sean.hefty $
+ */
+#include <linux/dma-mapping.h>
+#include <linux/err.h>
+#include <linux/idr.h>
+#include <linux/interrupt.h>
+#include <linux/pci.h>
+#include <linux/rbtree.h>
+#include <linux/spinlock.h>
+#include <linux/workqueue.h>
+
+#include <ib_cache.h>
+#include <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;
+ struct workqueue_struct *wq;
+} cm;
+
+struct cm_port {
+ struct cm_device *cm_dev;
+ struct ib_mad_agent *mad_agent;
+ u8 port_num;
+};
+
+struct cm_device {
+ struct list_head list;
+ struct ib_device *device;
+ u64 ca_guid;
+ 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 packet_life_time;
+};
+
+struct cm_work {
+ struct work_struct work;
+ struct list_head list;
+ struct cm_port *port;
+ struct ib_mad_recv_wc *mad_recv_wc; /* Received MADs */
+ u32 local_id; /* Established / timewait */
+ u32 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 rb_node remote_qp_node;
+ struct rb_node remote_id_node;
+ u64 remote_ca_guid;
+ u32 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;
+ wait_queue_head_t wait;
+ 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;
+
+ void *private_data;
+ u64 tid;
+ u32 local_qpn;
+ u32 remote_qpn;
+ u32 sq_psn;
+ u32 rq_psn;
+ int timeout_ms;
+ enum ib_mtu path_mtu;
+ u8 private_data_len;
+ u8 max_cm_retries;
+ u8 peer_to_peer;
+ u8 responder_resources;
+ u8 initiator_depth;
+ u8 local_ack_timeout;
+ u8 retry_count;
+ u8 rnr_retry_count;
+ u8 service_timeout;
+
+ struct list_head work_list;
+ atomic_t work_count;
+};
+
+static void cm_work_handler(void *data);
+
+static inline void cm_deref_id(struct cm_id_private *cm_id_priv)
+{
+ if (atomic_dec_and_test(&cm_id_priv->refcount))
+ wake_up(&cm_id_priv->wait);
+}
+
+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, 1, cm_id_priv->av.pkey_index,
+ ah, 0, sizeof(struct ib_mad_hdr),
+ sizeof(struct ib_mad)-sizeof(struct ib_mad_hdr),
+ GFP_ATOMIC);
+ if (IS_ERR(m)) {
+ ib_destroy_ah(ah);
+ return PTR_ERR(m);
+ }
+
+ /* Timeout set by caller if response is expected. */
+ m->send_wr.wr.ud.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,
+ ah, 0, sizeof(struct ib_mad_hdr),
+ sizeof(struct ib_mad)-sizeof(struct ib_mad_hdr),
+ GFP_ATOMIC);
+ if (IS_ERR(m)) {
+ ib_destroy_ah(ah);
+ return PTR_ERR(m);
+ }
+ *msg = m;
+ return 0;
+}
+
+static void cm_free_msg(struct ib_mad_send_buf *msg)
+{
+ ib_destroy_ah(msg->send_wr.wr.ud.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 = kmalloc(private_data_len, GFP_KERNEL);
+ if (!data)
+ return ERR_PTR(-ENOMEM);
+
+ memcpy(data, private_data, private_data_len);
+ 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_set_ah_attr(struct ib_ah_attr *ah_attr, u8 port_num,
+ u16 dlid, u8 sl, u16 src_path_bits)
+{
+ memset(ah_attr, 0, sizeof ah_attr);
+ ah_attr->dlid = be16_to_cpu(dlid);
+ ah_attr->sl = sl;
+ ah_attr->src_path_bits = src_path_bits;
+ ah_attr->port_num = port_num;
+}
+
+static void cm_init_av_for_response(struct cm_port *port,
+ struct ib_wc *wc, struct cm_av *av)
+{
+ av->port = port;
+ av->pkey_index = wc->pkey_index;
+ cm_set_ah_attr(&av->ah_attr, port->port_num, cpu_to_be16(wc->slid),
+ wc->sl, wc->dlid_path_bits);
+}
+
+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->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->device, port->port_num,
+ be16_to_cpu(path->pkey), &av->pkey_index);
+ if (ret)
+ return ret;
+
+ av->port = port;
+ cm_set_ah_attr(&av->ah_attr, av->port->port_num, path->dlid,
+ path->sl, path->slid & 0x7F);
+ av->packet_life_time = path->packet_life_time;
+ return 0;
+}
+
+static int cm_alloc_id(struct cm_id_private *cm_id_priv)
+{
+ unsigned long flags;
+ int ret;
+
+ do {
+ spin_lock_irqsave(&cm.lock, flags);
+ ret = idr_get_new_above(&cm.local_id_table, cm_id_priv, 1,
+ (int *) &cm_id_priv->id.local_id);
+ spin_unlock_irqrestore(&cm.lock, flags);
+ } while( (ret == -EAGAIN) && idr_pre_get(&cm.local_id_table, GFP_KERNEL) );
+ return ret;
+}
+
+static void cm_free_id(u32 local_id)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&cm.lock, flags);
+ idr_remove(&cm.local_id_table, (int) local_id);
+ spin_unlock_irqrestore(&cm.lock, flags);
+}
+
+static struct cm_id_private * cm_get_id(u32 local_id, u32 remote_id)
+{
+ struct cm_id_private *cm_id_priv;
+
+ cm_id_priv = idr_find(&cm.local_id_table, (int) local_id);
+ 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(u32 local_id, u32 remote_id)
+{
+ struct cm_id_private *cm_id_priv;
+ unsigned long flags;
+
+ spin_lock_irqsave(&cm.lock, flags);
+ cm_id_priv = cm_get_id(local_id, remote_id);
+ spin_unlock_irqrestore(&cm.lock, flags);
+
+ return cm_id_priv;
+}
+
+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;
+ u64 service_id = cm_id_priv->id.service_id;
+ u64 service_mask = cm_id_priv->id.service_mask;
+
+ while (*link) {
+ parent = *link;
+ cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
+ service_node);
+ if ((cur_cm_id_priv->id.service_mask & service_id) ==
+ (service_mask & cur_cm_id_priv->id.service_id))
+ return cm_id_priv;
+ if (service_id < cur_cm_id_priv->id.service_id)
+ 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(u64 service_id)
+{
+ struct rb_node *node = cm.listen_service_table.rb_node;
+ struct cm_id_private *cm_id_priv;
+
+ while (node) {
+ cm_id_priv = rb_entry(node, struct cm_id_private, service_node);
+ if ((cm_id_priv->id.service_mask & service_id) ==
+ (cm_id_priv->id.service_mask & cm_id_priv->id.service_id))
+ return cm_id_priv;
+ if (service_id < cm_id_priv->id.service_id)
+ 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;
+ u64 remote_ca_guid = timewait_info->remote_ca_guid;
+ u32 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 (remote_id < cur_timewait_info->work.remote_id)
+ link = &(*link)->rb_left;
+ else if (remote_id > cur_timewait_info->work.remote_id)
+ link = &(*link)->rb_right;
+ else if (remote_ca_guid < cur_timewait_info->remote_ca_guid)
+ link = &(*link)->rb_left;
+ else if (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(u64 remote_ca_guid,
+ u32 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 (remote_id < timewait_info->work.remote_id)
+ node = node->rb_left;
+ else if (remote_id > timewait_info->work.remote_id)
+ node = node->rb_right;
+ else if (remote_ca_guid < timewait_info->remote_ca_guid)
+ node = node->rb_left;
+ else if (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;
+ u64 remote_ca_guid = timewait_info->remote_ca_guid;
+ u32 remote_qpn = timewait_info->remote_qpn;
+
+ while (*link) {
+ parent = *link;
+ cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
+ remote_qp_node);
+ if (remote_qpn < cur_timewait_info->remote_qpn)
+ link = &(*link)->rb_left;
+ else if (remote_qpn > cur_timewait_info->remote_qpn)
+ link = &(*link)->rb_right;
+ else if (remote_ca_guid < cur_timewait_info->remote_ca_guid)
+ link = &(*link)->rb_left;
+ else if (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;
+ u32 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 (remote_id < cur_cm_id_priv->id.remote_id)
+ link = &(*link)->rb_left;
+ else if (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(¶m, 0, sizeof param);
+ param.status = status;
+ ib_send_cm_sidr_rep(&cm_id_priv->id, ¶m);
+}
+
+struct ib_cm_id *ib_create_cm_id(ib_cm_handler cm_handler,
+ void *context)
+{
+ struct cm_id_private *cm_id_priv;
+ int ret;
+
+ cm_id_priv = kmalloc(sizeof *cm_id_priv, GFP_KERNEL);
+ if (!cm_id_priv)
+ return ERR_PTR(-ENOMEM);
+
+ memset(cm_id_priv, 0, sizeof *cm_id_priv);
+ cm_id_priv->id.state = IB_CM_IDLE;
+ cm_id_priv->id.cm_handler = cm_handler;
+ cm_id_priv->id.context = context;
+ ret = cm_alloc_id(cm_id_priv);
+ if (ret)
+ goto error;
+
+ spin_lock_init(&cm_id_priv->lock);
+ init_waitqueue_head(&cm_id_priv->wait);
+ 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);
+}
+
+static void cm_cleanup_timewait(struct cm_timewait_info *timewait_info)
+{
+ unsigned long flags;
+
+ if (!timewait_info->inserted_remote_id &&
+ !timewait_info->inserted_remote_qp)
+ return;
+
+ spin_lock_irqsave(&cm.lock, flags);
+ 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;
+ }
+ spin_unlock_irqrestore(&cm.lock, flags);
+}
+
+static struct cm_timewait_info * cm_create_timewait_info(u32 local_id)
+{
+ struct cm_timewait_info *timewait_info;
+
+ timewait_info = kmalloc(sizeof *timewait_info, GFP_KERNEL);
+ if (!timewait_info)
+ return ERR_PTR(-ENOMEM);
+ memset(timewait_info, 0, sizeof *timewait_info);
+
+ timewait_info->work.local_id = local_id;
+ INIT_WORK(&timewait_info->work.work, cm_work_handler,
+ &timewait_info->work);
+ 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;
+
+ /*
+ * 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->local_ack_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)
+{
+ cm_id_priv->id.state = IB_CM_IDLE;
+ if (cm_id_priv->timewait_info) {
+ cm_cleanup_timewait(cm_id_priv->timewait_info);
+ kfree(cm_id_priv->timewait_info);
+ cm_id_priv->timewait_info = NULL;
+ }
+}
+
+void ib_destroy_cm_id(struct ib_cm_id *cm_id)
+{
+ struct cm_id_private *cm_id_priv;
+ struct cm_work *work;
+ unsigned long flags;
+
+ cm_id_priv = container_of(cm_id, struct cm_id_private, id);
+retest:
+ spin_lock_irqsave(&cm_id_priv->lock, flags);
+ switch (cm_id->state) {
+ case IB_CM_LISTEN:
+ 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->service_node, &cm.listen_service_table);
+ spin_unlock_irqrestore(&cm.lock, flags);
+ break;
+ case IB_CM_SIDR_REQ_SENT:
+ cm_id->state = IB_CM_IDLE;
+ ib_cancel_mad(cm_id_priv->av.port->mad_agent,
+ (unsigned long) cm_id_priv->msg);
+ spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+ break;
+ case IB_CM_SIDR_REQ_RCVD:
+ spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+ cm_reject_sidr_req(cm_id_priv, IB_SIDR_REJECT);
+ break;
+ 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,
+ (unsigned long) cm_id_priv->msg);
+ /* Fall through */
+ case IB_CM_REQ_RCVD:
+ case IB_CM_MRA_REQ_SENT:
+ case IB_CM_REP_RCVD:
+ case IB_CM_MRA_REP_SENT:
+ spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+ ib_send_cm_rej(cm_id, IB_CM_REJ_TIMEOUT,
+ &cm_id_priv->av.port->cm_dev->ca_guid,
+ sizeof cm_id_priv->av.port->cm_dev->ca_guid,
+ NULL, 0);
+ break;
+ case IB_CM_ESTABLISHED:
+ spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+ 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,
+ (unsigned long) cm_id_priv->msg);
+ cm_enter_timewait(cm_id_priv);
+ spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+ break;
+ case IB_CM_DREQ_RCVD:
+ spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+ ib_send_cm_drep(cm_id, NULL, 0);
+ break;
+ default:
+ spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+ break;
+ }
+
+ cm_free_id(cm_id->local_id);
+ atomic_dec(&cm_id_priv->refcount);
+ wait_event(cm_id_priv->wait, !atomic_read(&cm_id_priv->refcount));
+ while ((work = cm_dequeue_work(cm_id_priv)) != NULL)
+ cm_free_work(work);
+ if (cm_id_priv->private_data && cm_id_priv->private_data_len)
+ kfree(cm_id_priv->private_data);
+ kfree(cm_id_priv);
+}
+EXPORT_SYMBOL(ib_destroy_cm_id);
+
+int ib_cm_listen(struct ib_cm_id *cm_id,
+ u64 service_id,
+ u64 service_mask)
+{
+ struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
+ unsigned long flags;
+ int ret = 0;
+
+ service_mask = service_mask ? service_mask : ~0ULL;
+ 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);
+ BUG_ON(cm_id->state != IB_CM_IDLE);
+
+ 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 = ~0ULL;
+ } 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;
+ ret = -EBUSY;
+ }
+ return ret;
+}
+EXPORT_SYMBOL(ib_cm_listen);
+
+static u64 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) (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,
+ enum cm_msg_attr_id attr_id, u64 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)
+{
+ 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->av.port->cm_dev->ca_guid;
+ cm_req_set_local_qpn(req_msg, cpu_to_be32(param->qp_num));
+ cm_req_set_resp_res(req_msg, param->responder_resources);
+ 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);
+ cm_req_set_retry_count(req_msg, param->retry_count);
+ req_msg->pkey = param->primary_path->pkey;
+ cm_req_set_path_mtu(req_msg, param->primary_path->mtu);
+ cm_req_set_rnr_retry_count(req_msg, param->rnr_retry_count);
+ cm_req_set_max_cm_retries(req_msg, param->max_cm_retries);
+ cm_req_set_srq(req_msg, param->srq);
+
+ req_msg->primary_local_lid = param->primary_path->slid;
+ req_msg->primary_remote_lid = param->primary_path->dlid;
+ req_msg->primary_local_gid = param->primary_path->sgid;
+ req_msg->primary_remote_gid = param->primary_path->dgid;
+ cm_req_set_primary_flow_label(req_msg, param->primary_path->flow_label);
+ cm_req_set_primary_packet_rate(req_msg, param->primary_path->rate);
+ req_msg->primary_traffic_class = param->primary_path->traffic_class;
+ req_msg->primary_hop_limit = param->primary_path->hop_limit;
+ cm_req_set_primary_sl(req_msg, param->primary_path->sl);
+ cm_req_set_primary_subnet_local(req_msg, 1); /* local only... */
+ cm_req_set_primary_local_ack_timeout(req_msg,
+ min(31, param->primary_path->packet_life_time + 1));
+
+ if (param->alternate_path) {
+ req_msg->alt_local_lid = param->alternate_path->slid;
+ req_msg->alt_remote_lid = param->alternate_path->dlid;
+ req_msg->alt_local_gid = param->alternate_path->sgid;
+ req_msg->alt_remote_gid = param->alternate_path->dgid;
+ cm_req_set_alt_flow_label(req_msg,
+ param->alternate_path->flow_label);
+ cm_req_set_alt_packet_rate(req_msg, param->alternate_path->rate);
+ req_msg->alt_traffic_class = param->alternate_path->traffic_class;
+ req_msg->alt_hop_limit = param->alternate_path->hop_limit;
+ cm_req_set_alt_sl(req_msg, param->alternate_path->sl);
+ cm_req_set_alt_subnet_local(req_msg, 1); /* local only... */
+ cm_req_set_alt_local_ack_timeout(req_msg,
+ min(31, param->alternate_path->packet_life_time + 1));
+ }
+
+ if (param->private_data && param->private_data_len)
+ memcpy(req_msg->private_data, param->private_data,
+ param->private_data_len);
+}
+
+static inline 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)
+ 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 ib_send_wr *bad_send_wr;
+ 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))
+ 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 = ~0ULL;
+ 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;
+
+ 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->send_wr.wr.ud.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);
+ cm_id_priv->local_ack_timeout =
+ cm_req_get_primary_local_ack_timeout(req_msg);
+
+ spin_lock_irqsave(&cm_id_priv->lock, flags);
+ ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent,
+ &cm_id_priv->msg->send_wr, &bad_send_wr);
+ 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 ib_send_wr *bad_send_wr;
+ 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 = 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(port->mad_agent, &msg->send_wr, &bad_send_wr);
+ if (ret)
+ cm_free_msg(msg);
+
+ return ret;
+}
+
+static inline int cm_is_active_peer(u64 local_ca_guid, u64 remote_ca_guid,
+ u32 local_qpn, u32 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 inline 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->device = cm_id_priv->av.port->mad_agent->device;
+ 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)
+{
+ unsigned long flags;
+ 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_irqsave(&cm_id_priv->lock, flags);
+ work = cm_dequeue_work(cm_id_priv);
+ spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+ 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)
+ ib_destroy_cm_id(&cm_id_priv->id);
+}
+
+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 = 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;
+ struct ib_send_wr *bad_send_wr;
+ unsigned long flags;
+ int ret;
+
+ /* 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_irqsave(&cm_id_priv->lock, flags);
+ 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_irqrestore(&cm_id_priv->lock, flags);
+
+ ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent, &msg->send_wr,
+ &bad_send_wr);
+ if (ret)
+ goto free;
+ return;
+
+unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+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;
+ unsigned long flags;
+
+ req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
+
+ /* Check for duplicate REQ and stale connections. */
+ spin_lock_irqsave(&cm.lock, flags);
+ timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info);
+ if (!timewait_info)
+ timewait_info = cm_insert_remote_qpn(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_irqrestore(&cm.lock, flags);
+ if (cur_cm_id_priv) {
+ cm_dup_req_handler(work, cur_cm_id_priv);
+ cm_deref_id(cur_cm_id_priv);
+ } else
+ cm_issue_rej(work->port, work->mad_recv_wc,
+ IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ,
+ NULL, 0);
+ goto error;
+ }
+
+ /* Find matching listen request. */
+ listen_cm_id_priv = cm_find_listen(req_msg->service_id);
+ if (!listen_cm_id_priv) {
+ spin_unlock_irqrestore(&cm.lock, flags);
+ cm_issue_rej(work->port, work->mad_recv_wc,
+ IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ,
+ NULL, 0);
+ goto error;
+ }
+ 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_irqrestore(&cm.lock, flags);
+ return listen_cm_id_priv;
+
+error: cm_cleanup_timewait(cm_id_priv->timewait_info);
+ return NULL;
+}
+
+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(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,
+ &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 error1;
+ }
+ 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;
+ goto error2;
+ }
+
+ 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 = ~0ULL;
+
+ cm_format_paths_from_req(req_msg, &work->path[0], &work->path[1]);
+ ret = cm_init_av_by_path(&work->path[0], &cm_id_priv->av);
+ if (ret)
+ goto error3;
+ if (req_msg->alt_local_lid) {
+ ret = cm_init_av_by_path(&work->path[1], &cm_id_priv->alt_av);
+ if (ret)
+ goto error3;
+ }
+ 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->sq_psn = cm_req_get_starting_psn(req_msg);
+ cm_id_priv->local_ack_timeout =
+ cm_req_get_primary_local_ack_timeout(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_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;
+
+error3: atomic_dec(&cm_id_priv->refcount);
+ cm_deref_id(listen_cm_id_priv);
+ cm_cleanup_timewait(cm_id_priv->timewait_info);
+error2: kfree(cm_id_priv->timewait_info);
+error1: ib_destroy_cm_id(&cm_id_priv->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_local_qpn(rep_msg, cpu_to_be32(param->qp_num));
+ cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn));
+ rep_msg->resp_resources = param->responder_resources;
+ rep_msg->initiator_depth = param->initiator_depth;
+ cm_rep_set_target_ack_delay(rep_msg, param->target_ack_delay);
+ cm_rep_set_failover(rep_msg, param->failover_accepted);
+ cm_rep_set_flow_ctrl(rep_msg, param->flow_control);
+ cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count);
+ cm_rep_set_srq(rep_msg, param->srq);
+ rep_msg->local_ca_guid = cm_id_priv->av.port->cm_dev->ca_guid;
+
+ 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;
+ struct ib_send_wr *bad_send_wr;
+ 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->send_wr.wr.ud.timeout_ms = cm_id_priv->timeout_ms;
+ msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT;
+
+ ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent,
+ &msg->send_wr, &bad_send_wr);
+ 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 = cm_rep_get_local_qpn(rep_msg);
+
+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;
+ struct ib_send_wr *bad_send_wr;
+ 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(cm_id_priv->av.port->mad_agent,
+ &msg->send_wr, &bad_send_wr);
+ 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)
+{
+ 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_local_qpn(rep_msg));
+ 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;
+ struct ib_send_wr *bad_send_wr;
+ unsigned long flags;
+ 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;
+
+ ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
+ if (ret)
+ goto deref;
+
+ spin_lock_irqsave(&cm_id_priv->lock, flags);
+ 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_irqrestore(&cm_id_priv->lock, flags);
+
+ ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent, &msg->send_wr,
+ &bad_send_wr);
+ if (ret)
+ goto free;
+ goto deref;
+
+unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+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;
+ unsigned long flags;
+ 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_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_local_qpn(rep_msg);
+
+ spin_lock_irqsave(&cm.lock, flags);
+ /* Check for duplicate REP. */
+ if (cm_insert_remote_id(cm_id_priv->timewait_info)) {
+ spin_unlock_irqrestore(&cm.lock, flags);
+ ret = -EINVAL;
+ goto error;
+ }
+ /* Check for a stale connection. */
+ if (cm_insert_remote_qpn(cm_id_priv->timewait_info)) {
+ spin_unlock_irqrestore(&cm.lock, flags);
+ 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_irqrestore(&cm.lock, flags);
+
+ cm_format_rep_event(work);
+
+ 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:
+ break;
+ default:
+ spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+ ret = -EINVAL;
+ goto error;
+ }
+ 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_local_qpn(rep_msg);
+ 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);
+
+ /* todo: handle peer_to_peer */
+
+ ib_cancel_mad(cm_id_priv->av.port->mad_agent,
+ (unsigned long) 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_irqrestore(&cm_id_priv->lock, flags);
+
+ if (ret)
+ cm_process_work(cm_id_priv, work);
+ else
+ cm_deref_id(cm_id_priv);
+ return 0;
+
+error: cm_cleanup_timewait(cm_id_priv->timewait_info);
+ cm_deref_id(cm_id_priv);
+ return ret;
+}
+
+static int cm_establish_handler(struct cm_work *work)
+{
+ struct cm_id_private *cm_id_priv;
+ unsigned long flags;
+ int ret;
+
+ /* See comment in ib_cm_establish about lookup. */
+ cm_id_priv = cm_acquire_id(work->local_id, work->remote_id);
+ if (!cm_id_priv)
+ return -EINVAL;
+
+ spin_lock_irqsave(&cm_id_priv->lock, flags);
+ if (cm_id_priv->id.state != IB_CM_ESTABLISHED) {
+ spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+ goto out;
+ }
+
+ ib_cancel_mad(cm_id_priv->av.port->mad_agent,
+ (unsigned long) 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_irqrestore(&cm_id_priv->lock, flags);
+
+ 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;
+ unsigned long flags;
+ 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_irqsave(&cm_id_priv->lock, flags);
+ if (cm_id_priv->id.state != IB_CM_REP_SENT &&
+ cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) {
+ spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+ goto out;
+ }
+ cm_id_priv->id.state = IB_CM_ESTABLISHED;
+
+ ib_cancel_mad(cm_id_priv->av.port->mad_agent,
+ (unsigned long) 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_irqrestore(&cm_id_priv->lock, flags);
+
+ 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;
+ struct ib_send_wr *bad_send_wr;
+ 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;
+ }
+
+ 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->send_wr.wr.ud.timeout_ms = cm_id_priv->timeout_ms;
+ msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT;
+
+ ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent,
+ &msg->send_wr, &bad_send_wr);
+ 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;
+ struct ib_send_wr *bad_send_wr;
+ 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(cm_id_priv->av.port->mad_agent, &msg->send_wr,
+ &bad_send_wr);
+ 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_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;
+ struct ib_send_wr *bad_send_wr;
+ unsigned long flags;
+ 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)
+ return -EINVAL;
+
+ work->cm_event.private_data = &dreq_msg->private_data;
+
+ spin_lock_irqsave(&cm_id_priv->lock, flags);
+ 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,
+ (unsigned long) cm_id_priv->msg);
+ break;
+ case IB_CM_ESTABLISHED:
+ case IB_CM_MRA_REP_RCVD:
+ break;
+ case IB_CM_TIMEWAIT:
+ 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_irqrestore(&cm_id_priv->lock, flags);
+
+ if (ib_post_send_mad(cm_id_priv->av.port->mad_agent,
+ &msg->send_wr, &bad_send_wr))
+ cm_free_msg(msg);
+ goto deref;
+ 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_irqrestore(&cm_id_priv->lock, flags);
+
+ if (ret)
+ cm_process_work(cm_id_priv, work);
+ else
+ cm_deref_id(cm_id_priv);
+ return 0;
+
+unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+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;
+ unsigned long flags;
+ 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_irqsave(&cm_id_priv->lock, flags);
+ if (cm_id_priv->id.state != IB_CM_DREQ_SENT &&
+ cm_id_priv->id.state != IB_CM_DREQ_RCVD) {
+ spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+ goto out;
+ }
+ cm_enter_timewait(cm_id_priv);
+
+ ib_cancel_mad(cm_id_priv->av.port->mad_agent,
+ (unsigned long) 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_irqrestore(&cm_id_priv->lock, flags);
+
+ 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;
+ struct ib_send_wr *bad_send_wr;
+ 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(cm_id_priv->av.port->mad_agent,
+ &msg->send_wr, &bad_send_wr);
+ 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 = 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;
+ unsigned long flags;
+ u32 remote_id;
+
+ remote_id = rej_msg->local_comm_id;
+
+ if (rej_msg->reason == IB_CM_REJ_TIMEOUT) {
+ spin_lock_irqsave(&cm.lock, flags);
+ timewait_info = cm_find_remote_id( *((u64 *) rej_msg->ari),
+ remote_id);
+ if (!timewait_info) {
+ spin_unlock_irqrestore(&cm.lock, flags);
+ return NULL;
+ }
+ cm_id_priv = idr_find(&cm.local_id_table,
+ (int) timewait_info->work.local_id);
+ 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_irqrestore(&cm.lock, flags);
+ } 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;
+ unsigned long flags;
+ 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_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_REP_SENT:
+ case IB_CM_MRA_REP_RCVD:
+ ib_cancel_mad(cm_id_priv->av.port->mad_agent,
+ (unsigned long) cm_id_priv->msg);
+ /* fall through */
+ case IB_CM_REQ_RCVD:
+ case IB_CM_MRA_REQ_SENT:
+ if (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,
+ (unsigned long) cm_id_priv->msg);
+ /* fall through */
+ case IB_CM_REP_RCVD:
+ case IB_CM_MRA_REP_SENT:
+ case IB_CM_ESTABLISHED:
+ cm_enter_timewait(cm_id_priv);
+ break;
+ default:
+ spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+ 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_irqrestore(&cm_id_priv->lock, flags);
+
+ 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;
+ struct ib_send_wr *bad_send_wr;
+ 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:
+ ret = cm_alloc_msg(cm_id_priv, &msg);
+ if (ret)
+ goto error1;
+
+ cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
+ CM_MSG_RESPONSE_REQ, service_timeout,
+ private_data, private_data_len);
+ ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent,
+ &msg->send_wr, &bad_send_wr);
+ if (ret)
+ goto error2;
+ cm_id->state = IB_CM_MRA_REQ_SENT;
+ break;
+ case IB_CM_REP_RCVD:
+ ret = cm_alloc_msg(cm_id_priv, &msg);
+ if (ret)
+ goto error1;
+
+ cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
+ CM_MSG_RESPONSE_REP, service_timeout,
+ private_data, private_data_len);
+ ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent,
+ &msg->send_wr, &bad_send_wr);
+ if (ret)
+ goto error2;
+ cm_id->state = IB_CM_MRA_REP_SENT;
+ break;
+ case IB_CM_ESTABLISHED:
+ ret = cm_alloc_msg(cm_id_priv, &msg);
+ if (ret)
+ goto error1;
+
+ cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
+ CM_MSG_RESPONSE_OTHER, service_timeout,
+ private_data, private_data_len);
+ ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent,
+ &msg->send_wr, &bad_send_wr);
+ if (ret)
+ goto error2;
+ cm_id->lap_state = IB_CM_MRA_LAP_SENT;
+ break;
+ default:
+ ret = -EINVAL;
+ goto error1;
+ }
+ 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;
+ unsigned long flags;
+ 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.packet_life_time);
+
+ spin_lock_irqsave(&cm_id_priv->lock, flags);
+ 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,
+ (unsigned long) 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,
+ (unsigned long) 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,
+ (unsigned long) cm_id_priv->msg, timeout))
+ goto out;
+ cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD;
+ break;
+ 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_irqrestore(&cm_id_priv->lock, flags);
+
+ if (ret)
+ cm_process_work(cm_id_priv, work);
+ else
+ cm_deref_id(cm_id_priv);
+ return 0;
+out:
+ spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+ 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,
+ min(31, alternate_path->packet_life_time + 1));
+
+ 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;
+ struct ib_send_wr *bad_send_wr;
+ 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_IDLE) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ 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->send_wr.wr.ud.timeout_ms = cm_id_priv->timeout_ms;
+ msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED;
+
+ ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent,
+ &msg->send_wr, &bad_send_wr);
+ 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 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;
+ /* pkey is same as in REQ */
+ path->sl = cm_lap_get_sl(lap_msg);
+ path->mtu_selector = IB_SA_EQ;
+ /* mtu is same as in REQ */
+ 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;
+ struct ib_send_wr *bad_send_wr;
+ unsigned long flags;
+ 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(param->alternate_path, lap_msg);
+ work->cm_event.private_data = &lap_msg->private_data;
+
+ spin_lock_irqsave(&cm_id_priv->lock, flags);
+ if (cm_id_priv->id.state != IB_CM_ESTABLISHED)
+ goto unlock;
+
+ switch (cm_id_priv->id.lap_state) {
+ case IB_CM_LAP_IDLE:
+ break;
+ case IB_CM_MRA_LAP_SENT:
+ 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_irqrestore(&cm_id_priv->lock, flags);
+
+ if (ib_post_send_mad(cm_id_priv->av.port->mad_agent,
+ &msg->send_wr, &bad_send_wr))
+ cm_free_msg(msg);
+ goto deref;
+ default:
+ goto unlock;
+ }
+
+ cm_id_priv->id.lap_state = IB_CM_LAP_RCVD;
+ cm_id_priv->tid = lap_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_irqrestore(&cm_id_priv->lock, flags);
+
+ if (ret)
+ cm_process_work(cm_id_priv, work);
+ else
+ cm_deref_id(cm_id_priv);
+ return 0;
+
+unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+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;
+ struct ib_send_wr *bad_send_wr;
+ 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(cm_id_priv->av.port->mad_agent,
+ &msg->send_wr, &bad_send_wr);
+ 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;
+ unsigned long flags;
+ 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_irqsave(&cm_id_priv->lock, flags);
+ 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_irqrestore(&cm_id_priv->lock, flags);
+ goto out;
+ }
+ cm_id_priv->id.lap_state = IB_CM_LAP_IDLE;
+ ib_cancel_mad(cm_id_priv->av.port->mad_agent,
+ (unsigned long) 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_irqrestore(&cm_id_priv->lock, flags);
+
+ 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;
+ unsigned long flags;
+ int ret;
+
+ timewait_info = (struct cm_timewait_info *)work;
+ cm_cleanup_timewait(timewait_info);
+
+ cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
+ timewait_info->work.remote_id);
+ if (!cm_id_priv)
+ return -EINVAL;
+
+ spin_lock_irqsave(&cm_id_priv->lock, flags);
+ if (cm_id_priv->id.state != IB_CM_TIMEWAIT ||
+ cm_id_priv->remote_qpn != timewait_info->remote_qpn) {
+ spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+ 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_irqrestore(&cm_id_priv->lock, flags);
+
+ 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->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;
+ struct ib_send_wr *bad_send_wr;
+ 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 = ~0ULL;
+ 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->send_wr.wr.ud.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(cm_id_priv->av.port->mad_agent,
+ &msg->send_wr, &bad_send_wr);
+ 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 = sidr_req_msg->pkey;
+ param->listen_id = listen_id;
+ param->device = work->port->mad_agent->device;
+ 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;
+ unsigned long flags;
+
+ cm_id = ib_create_cm_id(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 = wc->slid;
+ cm_id_priv->av.dgid.global.interface_id = 0;
+ cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
+ &cm_id_priv->av);
+ cm_id_priv->id.remote_id = sidr_req_msg->request_id;
+ cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD;
+ cm_id_priv->tid = sidr_req_msg->hdr.tid;
+ atomic_inc(&cm_id_priv->work_count);
+
+ spin_lock_irqsave(&cm.lock, flags);
+ cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv);
+ if (cur_cm_id_priv) {
+ spin_unlock_irqrestore(&cm.lock, flags);
+ goto out; /* Duplicate message. */
+ }
+ cur_cm_id_priv = cm_find_listen(sidr_req_msg->service_id);
+ if (!cur_cm_id_priv) {
+ rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
+ spin_unlock_irqrestore(&cm.lock, flags);
+ /* todo: reply with no match */
+ goto out; /* No match. */
+ }
+ atomic_inc(&cur_cm_id_priv->refcount);
+ spin_unlock_irqrestore(&cm.lock, flags);
+
+ 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 = ~0ULL;
+
+ 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;
+ struct ib_send_wr *bad_send_wr;
+ 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(cm_id_priv->av.port->mad_agent,
+ &msg->send_wr, &bad_send_wr);
+ 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;
+ unsigned long flags;
+
+ 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_irqsave(&cm_id_priv->lock, flags);
+ if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) {
+ spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+ goto out;
+ }
+ cm_id_priv->id.state = IB_CM_IDLE;
+ ib_cancel_mad(cm_id_priv->av.port->mad_agent,
+ (unsigned long) cm_id_priv->msg);
+ spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+
+ 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;
+ unsigned long flags;
+ 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_irqsave(&cm_id_priv->lock, flags);
+ 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_irqrestore(&cm_id_priv->lock, flags);
+ 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_irqrestore(&cm_id_priv->lock, flags);
+ 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;
+
+ msg = (struct ib_mad_send_buf *)(unsigned long)mad_send_wc->wr_id;
+
+ 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(void *data)
+{
+ struct cm_work *work = data;
+ 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);
+}
+
+int ib_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_WORK(&work->work, cm_work_handler, work);
+ 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_work(cm.wq, &work->work);
+out:
+ return ret;
+}
+EXPORT_SYMBOL(ib_cm_establish);
+
+static void cm_recv_handler(struct ib_mad_agent *mad_agent,
+ struct ib_mad_recv_wc *mad_recv_wc)
+{
+ struct cm_work *work;
+ enum ib_cm_event_type event;
+ 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;
+ }
+
+ work = kmalloc(sizeof *work + sizeof(struct ib_sa_path_rec) * paths,
+ GFP_KERNEL);
+ if (!work) {
+ ib_free_recv_mad(mad_recv_wc);
+ return;
+ }
+
+ INIT_WORK(&work->work, cm_work_handler, work);
+ work->cm_event.event = event;
+ work->mad_recv_wc = mad_recv_wc;
+ work->port = (struct cm_port *)mad_agent->context;
+ queue_work(cm.wq, &work->work);
+}
+
+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_LOCAL_WRITE;
+ if (cm_id_priv->responder_resources)
+ qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_WRITE |
+ IB_ACCESS_REMOTE_READ;
+ 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 |
+ IB_QP_MAX_DEST_RD_ATOMIC | IB_QP_MIN_RNR_TIMER;
+ qp_attr->ah_attr = cm_id_priv->av.ah_attr;
+ 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);
+ 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_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) {
+ 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_TIMEOUT | IB_QP_RETRY_CNT |
+ IB_QP_RNR_RETRY | IB_QP_SQ_PSN |
+ IB_QP_MAX_QP_RD_ATOMIC;
+ qp_attr->timeout = cm_id_priv->local_ack_timeout;
+ qp_attr->retry_cnt = cm_id_priv->retry_count;
+ qp_attr->rnr_retry = cm_id_priv->rnr_retry_count;
+ qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn);
+ qp_attr->max_rd_atomic = cm_id_priv->initiator_depth;
+ 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;
+ }
+ 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 u64 cm_get_ca_guid(struct ib_device *device)
+{
+ struct ib_device_attr *device_attr;
+ u64 guid;
+ int ret;
+
+ device_attr = kmalloc(sizeof *device_attr, GFP_KERNEL);
+ if (!device_attr)
+ return 0;
+
+ ret = ib_query_device(device, device_attr);
+ guid = ret ? 0 : device_attr->node_guid;
+ kfree(device_attr);
+ return guid;
+}
+
+static void cm_add_one(struct ib_device *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;
+
+ cm_dev = kmalloc(sizeof(*cm_dev) + sizeof(*port) *
+ device->phys_port_cnt, GFP_KERNEL);
+ if (!cm_dev)
+ return;
+
+ cm_dev->device = device;
+ cm_dev->ca_guid = cm_get_ca_guid(device);
+ if (!cm_dev->ca_guid)
+ goto error1;
+
+ set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask);
+ for (i = 1; i <= device->phys_port_cnt; i++) {
+ port = &cm_dev->port[i-1];
+ port->cm_dev = cm_dev;
+ port->port_num = i;
+ port->mad_agent = ib_register_mad_agent(device, i,
+ IB_QPT_GSI,
+ ®_req,
+ 0,
+ cm_send_handler,
+ cm_recv_handler,
+ port);
+ if (IS_ERR(port->mad_agent))
+ goto error2;
+
+ ret = ib_modify_port(device, i, 0, &port_modify);
+ if (ret)
+ goto error3;
+ }
+ ib_set_client_data(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:
+ 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(device, port->port_num, 0, &port_modify);
+ ib_unregister_mad_agent(port->mad_agent);
+ }
+error1:
+ kfree(cm_dev);
+}
+
+static void cm_remove_one(struct ib_device *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(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 <= device->phys_port_cnt; i++) {
+ port = &cm_dev->port[i-1];
+ ib_modify_port(device, port->port_num, 0, &port_modify);
+ ib_unregister_mad_agent(port->mad_agent);
+ }
+ 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 = __constant_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);
+ idr_pre_get(&cm.local_id_table, GFP_KERNEL);
+
+ cm.wq = create_workqueue("ib_cm");
+ if (!cm.wq)
+ return -ENOMEM;
+
+ ret = ib_register_client(&cm_client);
+ if (ret)
+ goto error;
+
+ return 0;
+error:
+ destroy_workqueue(cm.wq);
+ return ret;
+}
+
+static void __exit ib_cm_cleanup(void)
+{
+ flush_workqueue(cm.wq);
+ destroy_workqueue(cm.wq);
+ ib_unregister_client(&cm_client);
+}
+
+module_init(ib_cm_init);
+module_exit(ib_cm_cleanup);
+
projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / commitdiff