| /* |
| * 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. |
| * Copyright (c) 2005 Open Grid Computing, Inc. All rights reserved. |
| * Copyright (c) 2005 Network Appliance, Inc. All rights reserved. |
| * |
| * This software is available to you under a choice of one of two |
| * licenses. You may choose to be licensed under the terms of the GNU |
| * General Public License (GPL) Version 2, available from the file |
| * COPYING in the main directory of this source tree, or the |
| * OpenIB.org BSD license below: |
| * |
| * Redistribution and use in source and binary forms, with or |
| * without modification, are permitted provided that the following |
| * conditions are met: |
| * |
| * - Redistributions of source code must retain the above |
| * copyright notice, this list of conditions and the following |
| * disclaimer. |
| * |
| * - Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following |
| * disclaimer in the documentation and/or other materials |
| * provided with the distribution. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
| * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS |
| * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN |
| * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
| * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| * SOFTWARE. |
| * |
| */ |
| #include <linux/dma-mapping.h> |
| #include <linux/err.h> |
| #include <linux/idr.h> |
| #include <linux/interrupt.h> |
| #include <linux/rbtree.h> |
| #include <linux/sched.h> |
| #include <linux/spinlock.h> |
| #include <linux/workqueue.h> |
| #include <linux/completion.h> |
| #include <linux/slab.h> |
| #include <linux/module.h> |
| #include <linux/sysctl.h> |
| |
| #include <rdma/iw_cm.h> |
| #include <rdma/ib_addr.h> |
| #include <rdma/iw_portmap.h> |
| #include <rdma/rdma_netlink.h> |
| |
| #include "iwcm.h" |
| |
| MODULE_AUTHOR("Tom Tucker"); |
| MODULE_DESCRIPTION("iWARP CM"); |
| MODULE_LICENSE("Dual BSD/GPL"); |
| |
| static const char * const iwcm_rej_reason_strs[] = { |
| [ECONNRESET] = "reset by remote host", |
| [ECONNREFUSED] = "refused by remote application", |
| [ETIMEDOUT] = "setup timeout", |
| }; |
| |
| const char *__attribute_const__ iwcm_reject_msg(int reason) |
| { |
| size_t index; |
| |
| /* iWARP uses negative errnos */ |
| index = -reason; |
| |
| if (index < ARRAY_SIZE(iwcm_rej_reason_strs) && |
| iwcm_rej_reason_strs[index]) |
| return iwcm_rej_reason_strs[index]; |
| else |
| return "unrecognized reason"; |
| } |
| EXPORT_SYMBOL(iwcm_reject_msg); |
| |
| static struct rdma_nl_cbs iwcm_nl_cb_table[] = { |
| [RDMA_NL_IWPM_REG_PID] = {.dump = iwpm_register_pid_cb}, |
| [RDMA_NL_IWPM_ADD_MAPPING] = {.dump = iwpm_add_mapping_cb}, |
| [RDMA_NL_IWPM_QUERY_MAPPING] = {.dump = iwpm_add_and_query_mapping_cb}, |
| [RDMA_NL_IWPM_REMOTE_INFO] = {.dump = iwpm_remote_info_cb}, |
| [RDMA_NL_IWPM_HANDLE_ERR] = {.dump = iwpm_mapping_error_cb}, |
| [RDMA_NL_IWPM_MAPINFO] = {.dump = iwpm_mapping_info_cb}, |
| [RDMA_NL_IWPM_MAPINFO_NUM] = {.dump = iwpm_ack_mapping_info_cb} |
| }; |
| |
| static struct workqueue_struct *iwcm_wq; |
| struct iwcm_work { |
| struct work_struct work; |
| struct iwcm_id_private *cm_id; |
| struct list_head list; |
| struct iw_cm_event event; |
| struct list_head free_list; |
| }; |
| |
| static unsigned int default_backlog = 256; |
| |
| static struct ctl_table_header *iwcm_ctl_table_hdr; |
| static struct ctl_table iwcm_ctl_table[] = { |
| { |
| .procname = "default_backlog", |
| .data = &default_backlog, |
| .maxlen = sizeof(default_backlog), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| { } |
| }; |
| |
| /* |
| * The following services provide a mechanism for pre-allocating iwcm_work |
| * elements. The design pre-allocates them based on the cm_id type: |
| * LISTENING IDS: Get enough elements preallocated to handle the |
| * listen backlog. |
| * ACTIVE IDS: 4: CONNECT_REPLY, ESTABLISHED, DISCONNECT, CLOSE |
| * PASSIVE IDS: 3: ESTABLISHED, DISCONNECT, CLOSE |
| * |
| * Allocating them in connect and listen avoids having to deal |
| * with allocation failures on the event upcall from the provider (which |
| * is called in the interrupt context). |
| * |
| * One exception is when creating the cm_id for incoming connection requests. |
| * There are two cases: |
| * 1) in the event upcall, cm_event_handler(), for a listening cm_id. If |
| * the backlog is exceeded, then no more connection request events will |
| * be processed. cm_event_handler() returns -ENOMEM in this case. Its up |
| * to the provider to reject the connection request. |
| * 2) in the connection request workqueue handler, cm_conn_req_handler(). |
| * If work elements cannot be allocated for the new connect request cm_id, |
| * then IWCM will call the provider reject method. This is ok since |
| * cm_conn_req_handler() runs in the workqueue thread context. |
| */ |
| |
| static struct iwcm_work *get_work(struct iwcm_id_private *cm_id_priv) |
| { |
| struct iwcm_work *work; |
| |
| if (list_empty(&cm_id_priv->work_free_list)) |
| return NULL; |
| work = list_entry(cm_id_priv->work_free_list.next, struct iwcm_work, |
| free_list); |
| list_del_init(&work->free_list); |
| return work; |
| } |
| |
| static void put_work(struct iwcm_work *work) |
| { |
| list_add(&work->free_list, &work->cm_id->work_free_list); |
| } |
| |
| static void dealloc_work_entries(struct iwcm_id_private *cm_id_priv) |
| { |
| struct list_head *e, *tmp; |
| |
| list_for_each_safe(e, tmp, &cm_id_priv->work_free_list) |
| kfree(list_entry(e, struct iwcm_work, free_list)); |
| } |
| |
| static int alloc_work_entries(struct iwcm_id_private *cm_id_priv, int count) |
| { |
| struct iwcm_work *work; |
| |
| BUG_ON(!list_empty(&cm_id_priv->work_free_list)); |
| while (count--) { |
| work = kmalloc(sizeof(struct iwcm_work), GFP_KERNEL); |
| if (!work) { |
| dealloc_work_entries(cm_id_priv); |
| return -ENOMEM; |
| } |
| work->cm_id = cm_id_priv; |
| INIT_LIST_HEAD(&work->list); |
| put_work(work); |
| } |
| return 0; |
| } |
| |
| /* |
| * Save private data from incoming connection requests to |
| * iw_cm_event, so the low level driver doesn't have to. Adjust |
| * the event ptr to point to the local copy. |
| */ |
| static int copy_private_data(struct iw_cm_event *event) |
| { |
| void *p; |
| |
| p = kmemdup(event->private_data, event->private_data_len, GFP_ATOMIC); |
| if (!p) |
| return -ENOMEM; |
| event->private_data = p; |
| return 0; |
| } |
| |
| static void free_cm_id(struct iwcm_id_private *cm_id_priv) |
| { |
| dealloc_work_entries(cm_id_priv); |
| kfree(cm_id_priv); |
| } |
| |
| /* |
| * Release a reference on cm_id. If the last reference is being |
| * released, free the cm_id and return 1. |
| */ |
| static int iwcm_deref_id(struct iwcm_id_private *cm_id_priv) |
| { |
| BUG_ON(atomic_read(&cm_id_priv->refcount)==0); |
| if (atomic_dec_and_test(&cm_id_priv->refcount)) { |
| BUG_ON(!list_empty(&cm_id_priv->work_list)); |
| free_cm_id(cm_id_priv); |
| return 1; |
| } |
| |
| return 0; |
| } |
| |
| static void add_ref(struct iw_cm_id *cm_id) |
| { |
| struct iwcm_id_private *cm_id_priv; |
| cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); |
| atomic_inc(&cm_id_priv->refcount); |
| } |
| |
| static void rem_ref(struct iw_cm_id *cm_id) |
| { |
| struct iwcm_id_private *cm_id_priv; |
| |
| cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); |
| |
| (void)iwcm_deref_id(cm_id_priv); |
| } |
| |
| static int cm_event_handler(struct iw_cm_id *cm_id, struct iw_cm_event *event); |
| |
| struct iw_cm_id *iw_create_cm_id(struct ib_device *device, |
| iw_cm_handler cm_handler, |
| void *context) |
| { |
| struct iwcm_id_private *cm_id_priv; |
| |
| cm_id_priv = kzalloc(sizeof(*cm_id_priv), GFP_KERNEL); |
| if (!cm_id_priv) |
| return ERR_PTR(-ENOMEM); |
| |
| cm_id_priv->state = IW_CM_STATE_IDLE; |
| cm_id_priv->id.device = device; |
| cm_id_priv->id.cm_handler = cm_handler; |
| cm_id_priv->id.context = context; |
| cm_id_priv->id.event_handler = cm_event_handler; |
| cm_id_priv->id.add_ref = add_ref; |
| cm_id_priv->id.rem_ref = rem_ref; |
| spin_lock_init(&cm_id_priv->lock); |
| atomic_set(&cm_id_priv->refcount, 1); |
| init_waitqueue_head(&cm_id_priv->connect_wait); |
| init_completion(&cm_id_priv->destroy_comp); |
| INIT_LIST_HEAD(&cm_id_priv->work_list); |
| INIT_LIST_HEAD(&cm_id_priv->work_free_list); |
| |
| return &cm_id_priv->id; |
| } |
| EXPORT_SYMBOL(iw_create_cm_id); |
| |
| |
| static int iwcm_modify_qp_err(struct ib_qp *qp) |
| { |
| struct ib_qp_attr qp_attr; |
| |
| if (!qp) |
| return -EINVAL; |
| |
| qp_attr.qp_state = IB_QPS_ERR; |
| return ib_modify_qp(qp, &qp_attr, IB_QP_STATE); |
| } |
| |
| /* |
| * This is really the RDMAC CLOSING state. It is most similar to the |
| * IB SQD QP state. |
| */ |
| static int iwcm_modify_qp_sqd(struct ib_qp *qp) |
| { |
| struct ib_qp_attr qp_attr; |
| |
| BUG_ON(qp == NULL); |
| qp_attr.qp_state = IB_QPS_SQD; |
| return ib_modify_qp(qp, &qp_attr, IB_QP_STATE); |
| } |
| |
| /* |
| * CM_ID <-- CLOSING |
| * |
| * Block if a passive or active connection is currently being processed. Then |
| * process the event as follows: |
| * - If we are ESTABLISHED, move to CLOSING and modify the QP state |
| * based on the abrupt flag |
| * - If the connection is already in the CLOSING or IDLE state, the peer is |
| * disconnecting concurrently with us and we've already seen the |
| * DISCONNECT event -- ignore the request and return 0 |
| * - Disconnect on a listening endpoint returns -EINVAL |
| */ |
| int iw_cm_disconnect(struct iw_cm_id *cm_id, int abrupt) |
| { |
| struct iwcm_id_private *cm_id_priv; |
| unsigned long flags; |
| int ret = 0; |
| struct ib_qp *qp = NULL; |
| |
| cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); |
| /* Wait if we're currently in a connect or accept downcall */ |
| wait_event(cm_id_priv->connect_wait, |
| !test_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags)); |
| |
| spin_lock_irqsave(&cm_id_priv->lock, flags); |
| switch (cm_id_priv->state) { |
| case IW_CM_STATE_ESTABLISHED: |
| cm_id_priv->state = IW_CM_STATE_CLOSING; |
| |
| /* QP could be <nul> for user-mode client */ |
| if (cm_id_priv->qp) |
| qp = cm_id_priv->qp; |
| else |
| ret = -EINVAL; |
| break; |
| case IW_CM_STATE_LISTEN: |
| ret = -EINVAL; |
| break; |
| case IW_CM_STATE_CLOSING: |
| /* remote peer closed first */ |
| case IW_CM_STATE_IDLE: |
| /* accept or connect returned !0 */ |
| break; |
| case IW_CM_STATE_CONN_RECV: |
| /* |
| * App called disconnect before/without calling accept after |
| * connect_request event delivered. |
| */ |
| break; |
| case IW_CM_STATE_CONN_SENT: |
| /* Can only get here if wait above fails */ |
| default: |
| BUG(); |
| } |
| spin_unlock_irqrestore(&cm_id_priv->lock, flags); |
| |
| if (qp) { |
| if (abrupt) |
| ret = iwcm_modify_qp_err(qp); |
| else |
| ret = iwcm_modify_qp_sqd(qp); |
| |
| /* |
| * If both sides are disconnecting the QP could |
| * already be in ERR or SQD states |
| */ |
| ret = 0; |
| } |
| |
| return ret; |
| } |
| EXPORT_SYMBOL(iw_cm_disconnect); |
| |
| /* |
| * CM_ID <-- DESTROYING |
| * |
| * Clean up all resources associated with the connection and release |
| * the initial reference taken by iw_create_cm_id. |
| */ |
| static void destroy_cm_id(struct iw_cm_id *cm_id) |
| { |
| struct iwcm_id_private *cm_id_priv; |
| unsigned long flags; |
| |
| cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); |
| /* |
| * Wait if we're currently in a connect or accept downcall. A |
| * listening endpoint should never block here. |
| */ |
| wait_event(cm_id_priv->connect_wait, |
| !test_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags)); |
| |
| /* |
| * Since we're deleting the cm_id, drop any events that |
| * might arrive before the last dereference. |
| */ |
| set_bit(IWCM_F_DROP_EVENTS, &cm_id_priv->flags); |
| |
| spin_lock_irqsave(&cm_id_priv->lock, flags); |
| switch (cm_id_priv->state) { |
| case IW_CM_STATE_LISTEN: |
| cm_id_priv->state = IW_CM_STATE_DESTROYING; |
| spin_unlock_irqrestore(&cm_id_priv->lock, flags); |
| /* destroy the listening endpoint */ |
| cm_id->device->iwcm->destroy_listen(cm_id); |
| spin_lock_irqsave(&cm_id_priv->lock, flags); |
| break; |
| case IW_CM_STATE_ESTABLISHED: |
| cm_id_priv->state = IW_CM_STATE_DESTROYING; |
| spin_unlock_irqrestore(&cm_id_priv->lock, flags); |
| /* Abrupt close of the connection */ |
| (void)iwcm_modify_qp_err(cm_id_priv->qp); |
| spin_lock_irqsave(&cm_id_priv->lock, flags); |
| break; |
| case IW_CM_STATE_IDLE: |
| case IW_CM_STATE_CLOSING: |
| cm_id_priv->state = IW_CM_STATE_DESTROYING; |
| break; |
| case IW_CM_STATE_CONN_RECV: |
| /* |
| * App called destroy before/without calling accept after |
| * receiving connection request event notification or |
| * returned non zero from the event callback function. |
| * In either case, must tell the provider to reject. |
| */ |
| cm_id_priv->state = IW_CM_STATE_DESTROYING; |
| spin_unlock_irqrestore(&cm_id_priv->lock, flags); |
| cm_id->device->iwcm->reject(cm_id, NULL, 0); |
| spin_lock_irqsave(&cm_id_priv->lock, flags); |
| break; |
| case IW_CM_STATE_CONN_SENT: |
| case IW_CM_STATE_DESTROYING: |
| default: |
| BUG(); |
| break; |
| } |
| if (cm_id_priv->qp) { |
| cm_id_priv->id.device->iwcm->rem_ref(cm_id_priv->qp); |
| cm_id_priv->qp = NULL; |
| } |
| spin_unlock_irqrestore(&cm_id_priv->lock, flags); |
| |
| if (cm_id->mapped) { |
| iwpm_remove_mapinfo(&cm_id->local_addr, &cm_id->m_local_addr); |
| iwpm_remove_mapping(&cm_id->local_addr, RDMA_NL_IWCM); |
| } |
| |
| (void)iwcm_deref_id(cm_id_priv); |
| } |
| |
| /* |
| * This function is only called by the application thread and cannot |
| * be called by the event thread. The function will wait for all |
| * references to be released on the cm_id and then kfree the cm_id |
| * object. |
| */ |
| void iw_destroy_cm_id(struct iw_cm_id *cm_id) |
| { |
| destroy_cm_id(cm_id); |
| } |
| EXPORT_SYMBOL(iw_destroy_cm_id); |
| |
| /** |
| * iw_cm_check_wildcard - If IP address is 0 then use original |
| * @pm_addr: sockaddr containing the ip to check for wildcard |
| * @cm_addr: sockaddr containing the actual IP address |
| * @cm_outaddr: sockaddr to set IP addr which leaving port |
| * |
| * Checks the pm_addr for wildcard and then sets cm_outaddr's |
| * IP to the actual (cm_addr). |
| */ |
| static void iw_cm_check_wildcard(struct sockaddr_storage *pm_addr, |
| struct sockaddr_storage *cm_addr, |
| struct sockaddr_storage *cm_outaddr) |
| { |
| if (pm_addr->ss_family == AF_INET) { |
| struct sockaddr_in *pm4_addr = (struct sockaddr_in *)pm_addr; |
| |
| if (pm4_addr->sin_addr.s_addr == htonl(INADDR_ANY)) { |
| struct sockaddr_in *cm4_addr = |
| (struct sockaddr_in *)cm_addr; |
| struct sockaddr_in *cm4_outaddr = |
| (struct sockaddr_in *)cm_outaddr; |
| |
| cm4_outaddr->sin_addr = cm4_addr->sin_addr; |
| } |
| } else { |
| struct sockaddr_in6 *pm6_addr = (struct sockaddr_in6 *)pm_addr; |
| |
| if (ipv6_addr_type(&pm6_addr->sin6_addr) == IPV6_ADDR_ANY) { |
| struct sockaddr_in6 *cm6_addr = |
| (struct sockaddr_in6 *)cm_addr; |
| struct sockaddr_in6 *cm6_outaddr = |
| (struct sockaddr_in6 *)cm_outaddr; |
| |
| cm6_outaddr->sin6_addr = cm6_addr->sin6_addr; |
| } |
| } |
| } |
| |
| /** |
| * iw_cm_map - Use portmapper to map the ports |
| * @cm_id: connection manager pointer |
| * @active: Indicates the active side when true |
| * returns nonzero for error only if iwpm_create_mapinfo() fails |
| * |
| * Tries to add a mapping for a port using the Portmapper. If |
| * successful in mapping the IP/Port it will check the remote |
| * mapped IP address for a wildcard IP address and replace the |
| * zero IP address with the remote_addr. |
| */ |
| static int iw_cm_map(struct iw_cm_id *cm_id, bool active) |
| { |
| struct iwpm_dev_data pm_reg_msg; |
| struct iwpm_sa_data pm_msg; |
| int status; |
| |
| cm_id->m_local_addr = cm_id->local_addr; |
| cm_id->m_remote_addr = cm_id->remote_addr; |
| |
| memcpy(pm_reg_msg.dev_name, cm_id->device->name, |
| sizeof(pm_reg_msg.dev_name)); |
| memcpy(pm_reg_msg.if_name, cm_id->device->iwcm->ifname, |
| sizeof(pm_reg_msg.if_name)); |
| |
| if (iwpm_register_pid(&pm_reg_msg, RDMA_NL_IWCM) || |
| !iwpm_valid_pid()) |
| return 0; |
| |
| cm_id->mapped = true; |
| pm_msg.loc_addr = cm_id->local_addr; |
| pm_msg.rem_addr = cm_id->remote_addr; |
| if (active) |
| status = iwpm_add_and_query_mapping(&pm_msg, |
| RDMA_NL_IWCM); |
| else |
| status = iwpm_add_mapping(&pm_msg, RDMA_NL_IWCM); |
| |
| if (!status) { |
| cm_id->m_local_addr = pm_msg.mapped_loc_addr; |
| if (active) { |
| cm_id->m_remote_addr = pm_msg.mapped_rem_addr; |
| iw_cm_check_wildcard(&pm_msg.mapped_rem_addr, |
| &cm_id->remote_addr, |
| &cm_id->m_remote_addr); |
| } |
| } |
| |
| return iwpm_create_mapinfo(&cm_id->local_addr, |
| &cm_id->m_local_addr, |
| RDMA_NL_IWCM); |
| } |
| |
| /* |
| * CM_ID <-- LISTEN |
| * |
| * Start listening for connect requests. Generates one CONNECT_REQUEST |
| * event for each inbound connect request. |
| */ |
| int iw_cm_listen(struct iw_cm_id *cm_id, int backlog) |
| { |
| struct iwcm_id_private *cm_id_priv; |
| unsigned long flags; |
| int ret; |
| |
| cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); |
| |
| if (!backlog) |
| backlog = default_backlog; |
| |
| ret = alloc_work_entries(cm_id_priv, backlog); |
| if (ret) |
| return ret; |
| |
| spin_lock_irqsave(&cm_id_priv->lock, flags); |
| switch (cm_id_priv->state) { |
| case IW_CM_STATE_IDLE: |
| cm_id_priv->state = IW_CM_STATE_LISTEN; |
| spin_unlock_irqrestore(&cm_id_priv->lock, flags); |
| ret = iw_cm_map(cm_id, false); |
| if (!ret) |
| ret = cm_id->device->iwcm->create_listen(cm_id, backlog); |
| if (ret) |
| cm_id_priv->state = IW_CM_STATE_IDLE; |
| spin_lock_irqsave(&cm_id_priv->lock, flags); |
| break; |
| default: |
| ret = -EINVAL; |
| } |
| spin_unlock_irqrestore(&cm_id_priv->lock, flags); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL(iw_cm_listen); |
| |
| /* |
| * CM_ID <-- IDLE |
| * |
| * Rejects an inbound connection request. No events are generated. |
| */ |
| int iw_cm_reject(struct iw_cm_id *cm_id, |
| const void *private_data, |
| u8 private_data_len) |
| { |
| struct iwcm_id_private *cm_id_priv; |
| unsigned long flags; |
| int ret; |
| |
| cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); |
| set_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); |
| |
| spin_lock_irqsave(&cm_id_priv->lock, flags); |
| if (cm_id_priv->state != IW_CM_STATE_CONN_RECV) { |
| spin_unlock_irqrestore(&cm_id_priv->lock, flags); |
| clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); |
| wake_up_all(&cm_id_priv->connect_wait); |
| return -EINVAL; |
| } |
| cm_id_priv->state = IW_CM_STATE_IDLE; |
| spin_unlock_irqrestore(&cm_id_priv->lock, flags); |
| |
| ret = cm_id->device->iwcm->reject(cm_id, private_data, |
| private_data_len); |
| |
| clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); |
| wake_up_all(&cm_id_priv->connect_wait); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL(iw_cm_reject); |
| |
| /* |
| * CM_ID <-- ESTABLISHED |
| * |
| * Accepts an inbound connection request and generates an ESTABLISHED |
| * event. Callers of iw_cm_disconnect and iw_destroy_cm_id will block |
| * until the ESTABLISHED event is received from the provider. |
| */ |
| int iw_cm_accept(struct iw_cm_id *cm_id, |
| struct iw_cm_conn_param *iw_param) |
| { |
| struct iwcm_id_private *cm_id_priv; |
| struct ib_qp *qp; |
| unsigned long flags; |
| int ret; |
| |
| cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); |
| set_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); |
| |
| spin_lock_irqsave(&cm_id_priv->lock, flags); |
| if (cm_id_priv->state != IW_CM_STATE_CONN_RECV) { |
| spin_unlock_irqrestore(&cm_id_priv->lock, flags); |
| clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); |
| wake_up_all(&cm_id_priv->connect_wait); |
| return -EINVAL; |
| } |
| /* Get the ib_qp given the QPN */ |
| qp = cm_id->device->iwcm->get_qp(cm_id->device, iw_param->qpn); |
| if (!qp) { |
| spin_unlock_irqrestore(&cm_id_priv->lock, flags); |
| clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); |
| wake_up_all(&cm_id_priv->connect_wait); |
| return -EINVAL; |
| } |
| cm_id->device->iwcm->add_ref(qp); |
| cm_id_priv->qp = qp; |
| spin_unlock_irqrestore(&cm_id_priv->lock, flags); |
| |
| ret = cm_id->device->iwcm->accept(cm_id, iw_param); |
| if (ret) { |
| /* An error on accept precludes provider events */ |
| BUG_ON(cm_id_priv->state != IW_CM_STATE_CONN_RECV); |
| cm_id_priv->state = IW_CM_STATE_IDLE; |
| spin_lock_irqsave(&cm_id_priv->lock, flags); |
| if (cm_id_priv->qp) { |
| cm_id->device->iwcm->rem_ref(qp); |
| cm_id_priv->qp = NULL; |
| } |
| spin_unlock_irqrestore(&cm_id_priv->lock, flags); |
| clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); |
| wake_up_all(&cm_id_priv->connect_wait); |
| } |
| |
| return ret; |
| } |
| EXPORT_SYMBOL(iw_cm_accept); |
| |
| /* |
| * Active Side: CM_ID <-- CONN_SENT |
| * |
| * If successful, results in the generation of a CONNECT_REPLY |
| * event. iw_cm_disconnect and iw_cm_destroy will block until the |
| * CONNECT_REPLY event is received from the provider. |
| */ |
| int iw_cm_connect(struct iw_cm_id *cm_id, struct iw_cm_conn_param *iw_param) |
| { |
| struct iwcm_id_private *cm_id_priv; |
| int ret; |
| unsigned long flags; |
| struct ib_qp *qp; |
| |
| cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); |
| |
| ret = alloc_work_entries(cm_id_priv, 4); |
| if (ret) |
| return ret; |
| |
| set_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); |
| spin_lock_irqsave(&cm_id_priv->lock, flags); |
| |
| if (cm_id_priv->state != IW_CM_STATE_IDLE) { |
| ret = -EINVAL; |
| goto err; |
| } |
| |
| /* Get the ib_qp given the QPN */ |
| qp = cm_id->device->iwcm->get_qp(cm_id->device, iw_param->qpn); |
| if (!qp) { |
| ret = -EINVAL; |
| goto err; |
| } |
| cm_id->device->iwcm->add_ref(qp); |
| cm_id_priv->qp = qp; |
| cm_id_priv->state = IW_CM_STATE_CONN_SENT; |
| spin_unlock_irqrestore(&cm_id_priv->lock, flags); |
| |
| ret = iw_cm_map(cm_id, true); |
| if (!ret) |
| ret = cm_id->device->iwcm->connect(cm_id, iw_param); |
| if (!ret) |
| return 0; /* success */ |
| |
| spin_lock_irqsave(&cm_id_priv->lock, flags); |
| if (cm_id_priv->qp) { |
| cm_id->device->iwcm->rem_ref(qp); |
| cm_id_priv->qp = NULL; |
| } |
| cm_id_priv->state = IW_CM_STATE_IDLE; |
| err: |
| spin_unlock_irqrestore(&cm_id_priv->lock, flags); |
| clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); |
| wake_up_all(&cm_id_priv->connect_wait); |
| return ret; |
| } |
| EXPORT_SYMBOL(iw_cm_connect); |
| |
| /* |
| * Passive Side: new CM_ID <-- CONN_RECV |
| * |
| * Handles an inbound connect request. The function creates a new |
| * iw_cm_id to represent the new connection and inherits the client |
| * callback function and other attributes from the listening parent. |
| * |
| * The work item contains a pointer to the listen_cm_id and the event. The |
| * listen_cm_id contains the client cm_handler, context and |
| * device. These are copied when the device is cloned. The event |
| * contains the new four tuple. |
| * |
| * An error on the child should not affect the parent, so this |
| * function does not return a value. |
| */ |
| static void cm_conn_req_handler(struct iwcm_id_private *listen_id_priv, |
| struct iw_cm_event *iw_event) |
| { |
| unsigned long flags; |
| struct iw_cm_id *cm_id; |
| struct iwcm_id_private *cm_id_priv; |
| int ret; |
| |
| /* |
| * The provider should never generate a connection request |
| * event with a bad status. |
| */ |
| BUG_ON(iw_event->status); |
| |
| cm_id = iw_create_cm_id(listen_id_priv->id.device, |
| listen_id_priv->id.cm_handler, |
| listen_id_priv->id.context); |
| /* If the cm_id could not be created, ignore the request */ |
| if (IS_ERR(cm_id)) |
| goto out; |
| |
| cm_id->provider_data = iw_event->provider_data; |
| cm_id->m_local_addr = iw_event->local_addr; |
| cm_id->m_remote_addr = iw_event->remote_addr; |
| cm_id->local_addr = listen_id_priv->id.local_addr; |
| |
| ret = iwpm_get_remote_info(&listen_id_priv->id.m_local_addr, |
| &iw_event->remote_addr, |
| &cm_id->remote_addr, |
| RDMA_NL_IWCM); |
| if (ret) { |
| cm_id->remote_addr = iw_event->remote_addr; |
| } else { |
| iw_cm_check_wildcard(&listen_id_priv->id.m_local_addr, |
| &iw_event->local_addr, |
| &cm_id->local_addr); |
| iw_event->local_addr = cm_id->local_addr; |
| iw_event->remote_addr = cm_id->remote_addr; |
| } |
| |
| cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); |
| cm_id_priv->state = IW_CM_STATE_CONN_RECV; |
| |
| /* |
| * We could be destroying the listening id. If so, ignore this |
| * upcall. |
| */ |
| spin_lock_irqsave(&listen_id_priv->lock, flags); |
| if (listen_id_priv->state != IW_CM_STATE_LISTEN) { |
| spin_unlock_irqrestore(&listen_id_priv->lock, flags); |
| iw_cm_reject(cm_id, NULL, 0); |
| iw_destroy_cm_id(cm_id); |
| goto out; |
| } |
| spin_unlock_irqrestore(&listen_id_priv->lock, flags); |
| |
| ret = alloc_work_entries(cm_id_priv, 3); |
| if (ret) { |
| iw_cm_reject(cm_id, NULL, 0); |
| iw_destroy_cm_id(cm_id); |
| goto out; |
| } |
| |
| /* Call the client CM handler */ |
| ret = cm_id->cm_handler(cm_id, iw_event); |
| if (ret) { |
| iw_cm_reject(cm_id, NULL, 0); |
| iw_destroy_cm_id(cm_id); |
| } |
| |
| out: |
| if (iw_event->private_data_len) |
| kfree(iw_event->private_data); |
| } |
| |
| /* |
| * Passive Side: CM_ID <-- ESTABLISHED |
| * |
| * The provider generated an ESTABLISHED event which means that |
| * the MPA negotion has completed successfully and we are now in MPA |
| * FPDU mode. |
| * |
| * This event can only be received in the CONN_RECV state. If the |
| * remote peer closed, the ESTABLISHED event would be received followed |
| * by the CLOSE event. If the app closes, it will block until we wake |
| * it up after processing this event. |
| */ |
| static int cm_conn_est_handler(struct iwcm_id_private *cm_id_priv, |
| struct iw_cm_event *iw_event) |
| { |
| unsigned long flags; |
| int ret; |
| |
| spin_lock_irqsave(&cm_id_priv->lock, flags); |
| |
| /* |
| * We clear the CONNECT_WAIT bit here to allow the callback |
| * function to call iw_cm_disconnect. Calling iw_destroy_cm_id |
| * from a callback handler is not allowed. |
| */ |
| clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); |
| BUG_ON(cm_id_priv->state != IW_CM_STATE_CONN_RECV); |
| cm_id_priv->state = IW_CM_STATE_ESTABLISHED; |
| spin_unlock_irqrestore(&cm_id_priv->lock, flags); |
| ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, iw_event); |
| wake_up_all(&cm_id_priv->connect_wait); |
| |
| return ret; |
| } |
| |
| /* |
| * Active Side: CM_ID <-- ESTABLISHED |
| * |
| * The app has called connect and is waiting for the established event to |
| * post it's requests to the server. This event will wake up anyone |
| * blocked in iw_cm_disconnect or iw_destroy_id. |
| */ |
| static int cm_conn_rep_handler(struct iwcm_id_private *cm_id_priv, |
| struct iw_cm_event *iw_event) |
| { |
| unsigned long flags; |
| int ret; |
| |
| spin_lock_irqsave(&cm_id_priv->lock, flags); |
| /* |
| * Clear the connect wait bit so a callback function calling |
| * iw_cm_disconnect will not wait and deadlock this thread |
| */ |
| clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); |
| BUG_ON(cm_id_priv->state != IW_CM_STATE_CONN_SENT); |
| if (iw_event->status == 0) { |
| cm_id_priv->id.m_local_addr = iw_event->local_addr; |
| cm_id_priv->id.m_remote_addr = iw_event->remote_addr; |
| iw_event->local_addr = cm_id_priv->id.local_addr; |
| iw_event->remote_addr = cm_id_priv->id.remote_addr; |
| cm_id_priv->state = IW_CM_STATE_ESTABLISHED; |
| } else { |
| /* REJECTED or RESET */ |
| cm_id_priv->id.device->iwcm->rem_ref(cm_id_priv->qp); |
| cm_id_priv->qp = NULL; |
| cm_id_priv->state = IW_CM_STATE_IDLE; |
| } |
| spin_unlock_irqrestore(&cm_id_priv->lock, flags); |
| ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, iw_event); |
| |
| if (iw_event->private_data_len) |
| kfree(iw_event->private_data); |
| |
| /* Wake up waiters on connect complete */ |
| wake_up_all(&cm_id_priv->connect_wait); |
| |
| return ret; |
| } |
| |
| /* |
| * CM_ID <-- CLOSING |
| * |
| * If in the ESTABLISHED state, move to CLOSING. |
| */ |
| static void cm_disconnect_handler(struct iwcm_id_private *cm_id_priv, |
| struct iw_cm_event *iw_event) |
| { |
| unsigned long flags; |
| |
| spin_lock_irqsave(&cm_id_priv->lock, flags); |
| if (cm_id_priv->state == IW_CM_STATE_ESTABLISHED) |
| cm_id_priv->state = IW_CM_STATE_CLOSING; |
| spin_unlock_irqrestore(&cm_id_priv->lock, flags); |
| } |
| |
| /* |
| * CM_ID <-- IDLE |
| * |
| * If in the ESTBLISHED or CLOSING states, the QP will have have been |
| * moved by the provider to the ERR state. Disassociate the CM_ID from |
| * the QP, move to IDLE, and remove the 'connected' reference. |
| * |
| * If in some other state, the cm_id was destroyed asynchronously. |
| * This is the last reference that will result in waking up |
| * the app thread blocked in iw_destroy_cm_id. |
| */ |
| static int cm_close_handler(struct iwcm_id_private *cm_id_priv, |
| struct iw_cm_event *iw_event) |
| { |
| unsigned long flags; |
| int ret = 0; |
| spin_lock_irqsave(&cm_id_priv->lock, flags); |
| |
| if (cm_id_priv->qp) { |
| cm_id_priv->id.device->iwcm->rem_ref(cm_id_priv->qp); |
| cm_id_priv->qp = NULL; |
| } |
| switch (cm_id_priv->state) { |
| case IW_CM_STATE_ESTABLISHED: |
| case IW_CM_STATE_CLOSING: |
| cm_id_priv->state = IW_CM_STATE_IDLE; |
| spin_unlock_irqrestore(&cm_id_priv->lock, flags); |
| ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, iw_event); |
| spin_lock_irqsave(&cm_id_priv->lock, flags); |
| break; |
| case IW_CM_STATE_DESTROYING: |
| break; |
| default: |
| BUG(); |
| } |
| spin_unlock_irqrestore(&cm_id_priv->lock, flags); |
| |
| return ret; |
| } |
| |
| static int process_event(struct iwcm_id_private *cm_id_priv, |
| struct iw_cm_event *iw_event) |
| { |
| int ret = 0; |
| |
| switch (iw_event->event) { |
| case IW_CM_EVENT_CONNECT_REQUEST: |
| cm_conn_req_handler(cm_id_priv, iw_event); |
| break; |
| case IW_CM_EVENT_CONNECT_REPLY: |
| ret = cm_conn_rep_handler(cm_id_priv, iw_event); |
| break; |
| case IW_CM_EVENT_ESTABLISHED: |
| ret = cm_conn_est_handler(cm_id_priv, iw_event); |
| break; |
| case IW_CM_EVENT_DISCONNECT: |
| cm_disconnect_handler(cm_id_priv, iw_event); |
| break; |
| case IW_CM_EVENT_CLOSE: |
| ret = cm_close_handler(cm_id_priv, iw_event); |
| break; |
| default: |
| BUG(); |
| } |
| |
| return ret; |
| } |
| |
| /* |
| * Process events on the work_list for the cm_id. If the callback |
| * function requests that the cm_id be deleted, a flag is set in the |
| * cm_id flags to indicate that when the last reference is |
| * removed, the cm_id is to be destroyed. This is necessary to |
| * distinguish between an object that will be destroyed by the app |
| * thread asleep on the destroy_comp list vs. an object destroyed |
| * here synchronously when the last reference is removed. |
| */ |
| static void cm_work_handler(struct work_struct *_work) |
| { |
| struct iwcm_work *work = container_of(_work, struct iwcm_work, work); |
| struct iw_cm_event levent; |
| struct iwcm_id_private *cm_id_priv = work->cm_id; |
| unsigned long flags; |
| int empty; |
| int ret = 0; |
| |
| spin_lock_irqsave(&cm_id_priv->lock, flags); |
| empty = list_empty(&cm_id_priv->work_list); |
| while (!empty) { |
| work = list_entry(cm_id_priv->work_list.next, |
| struct iwcm_work, list); |
| list_del_init(&work->list); |
| empty = list_empty(&cm_id_priv->work_list); |
| levent = work->event; |
| put_work(work); |
| spin_unlock_irqrestore(&cm_id_priv->lock, flags); |
| |
| if (!test_bit(IWCM_F_DROP_EVENTS, &cm_id_priv->flags)) { |
| ret = process_event(cm_id_priv, &levent); |
| if (ret) |
| destroy_cm_id(&cm_id_priv->id); |
| } else |
| pr_debug("dropping event %d\n", levent.event); |
| if (iwcm_deref_id(cm_id_priv)) |
| return; |
| if (empty) |
| return; |
| spin_lock_irqsave(&cm_id_priv->lock, flags); |
| } |
| spin_unlock_irqrestore(&cm_id_priv->lock, flags); |
| } |
| |
| /* |
| * This function is called on interrupt context. Schedule events on |
| * the iwcm_wq thread to allow callback functions to downcall into |
| * the CM and/or block. Events are queued to a per-CM_ID |
| * work_list. If this is the first event on the work_list, the work |
| * element is also queued on the iwcm_wq thread. |
| * |
| * Each event holds a reference on the cm_id. Until the last posted |
| * event has been delivered and processed, the cm_id cannot be |
| * deleted. |
| * |
| * Returns: |
| * 0 - the event was handled. |
| * -ENOMEM - the event was not handled due to lack of resources. |
| */ |
| static int cm_event_handler(struct iw_cm_id *cm_id, |
| struct iw_cm_event *iw_event) |
| { |
| struct iwcm_work *work; |
| struct iwcm_id_private *cm_id_priv; |
| unsigned long flags; |
| int ret = 0; |
| |
| cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); |
| |
| spin_lock_irqsave(&cm_id_priv->lock, flags); |
| work = get_work(cm_id_priv); |
| if (!work) { |
| ret = -ENOMEM; |
| goto out; |
| } |
| |
| INIT_WORK(&work->work, cm_work_handler); |
| work->cm_id = cm_id_priv; |
| work->event = *iw_event; |
| |
| if ((work->event.event == IW_CM_EVENT_CONNECT_REQUEST || |
| work->event.event == IW_CM_EVENT_CONNECT_REPLY) && |
| work->event.private_data_len) { |
| ret = copy_private_data(&work->event); |
| if (ret) { |
| put_work(work); |
| goto out; |
| } |
| } |
| |
| atomic_inc(&cm_id_priv->refcount); |
| if (list_empty(&cm_id_priv->work_list)) { |
| list_add_tail(&work->list, &cm_id_priv->work_list); |
| queue_work(iwcm_wq, &work->work); |
| } else |
| list_add_tail(&work->list, &cm_id_priv->work_list); |
| out: |
| spin_unlock_irqrestore(&cm_id_priv->lock, flags); |
| return ret; |
| } |
| |
| static int iwcm_init_qp_init_attr(struct iwcm_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->state) { |
| case IW_CM_STATE_IDLE: |
| case IW_CM_STATE_CONN_SENT: |
| case IW_CM_STATE_CONN_RECV: |
| case IW_CM_STATE_ESTABLISHED: |
| *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS; |
| qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE| |
| IB_ACCESS_REMOTE_READ; |
| ret = 0; |
| break; |
| default: |
| ret = -EINVAL; |
| break; |
| } |
| spin_unlock_irqrestore(&cm_id_priv->lock, flags); |
| return ret; |
| } |
| |
| static int iwcm_init_qp_rts_attr(struct iwcm_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->state) { |
| case IW_CM_STATE_IDLE: |
| case IW_CM_STATE_CONN_SENT: |
| case IW_CM_STATE_CONN_RECV: |
| case IW_CM_STATE_ESTABLISHED: |
| *qp_attr_mask = 0; |
| ret = 0; |
| break; |
| default: |
| ret = -EINVAL; |
| break; |
| } |
| spin_unlock_irqrestore(&cm_id_priv->lock, flags); |
| return ret; |
| } |
| |
| int iw_cm_init_qp_attr(struct iw_cm_id *cm_id, |
| struct ib_qp_attr *qp_attr, |
| int *qp_attr_mask) |
| { |
| struct iwcm_id_private *cm_id_priv; |
| int ret; |
| |
| cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); |
| switch (qp_attr->qp_state) { |
| case IB_QPS_INIT: |
| case IB_QPS_RTR: |
| ret = iwcm_init_qp_init_attr(cm_id_priv, |
| qp_attr, qp_attr_mask); |
| break; |
| case IB_QPS_RTS: |
| ret = iwcm_init_qp_rts_attr(cm_id_priv, |
| qp_attr, qp_attr_mask); |
| break; |
| default: |
| ret = -EINVAL; |
| break; |
| } |
| return ret; |
| } |
| EXPORT_SYMBOL(iw_cm_init_qp_attr); |
| |
| static int __init iw_cm_init(void) |
| { |
| int ret; |
| |
| ret = iwpm_init(RDMA_NL_IWCM); |
| if (ret) |
| pr_err("iw_cm: couldn't init iwpm\n"); |
| else |
| rdma_nl_register(RDMA_NL_IWCM, iwcm_nl_cb_table); |
| iwcm_wq = alloc_ordered_workqueue("iw_cm_wq", 0); |
| if (!iwcm_wq) |
| return -ENOMEM; |
| |
| iwcm_ctl_table_hdr = register_net_sysctl(&init_net, "net/iw_cm", |
| iwcm_ctl_table); |
| if (!iwcm_ctl_table_hdr) { |
| pr_err("iw_cm: couldn't register sysctl paths\n"); |
| destroy_workqueue(iwcm_wq); |
| return -ENOMEM; |
| } |
| |
| return 0; |
| } |
| |
| static void __exit iw_cm_cleanup(void) |
| { |
| unregister_net_sysctl_table(iwcm_ctl_table_hdr); |
| destroy_workqueue(iwcm_wq); |
| rdma_nl_unregister(RDMA_NL_IWCM); |
| iwpm_exit(RDMA_NL_IWCM); |
| } |
| |
| MODULE_ALIAS_RDMA_NETLINK(RDMA_NL_IWCM, 2); |
| |
| module_init(iw_cm_init); |
| module_exit(iw_cm_cleanup); |