/* * 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(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …; static const char * const iwcm_rej_reason_strs[] = …; const char *__attribute_const__ iwcm_reject_msg(int reason) { … } EXPORT_SYMBOL(…); static struct rdma_nl_cbs iwcm_nl_cb_table[RDMA_NL_IWPM_NUM_OPS] = …; static struct workqueue_struct *iwcm_wq; struct iwcm_work { … }; static unsigned int default_backlog = …; static struct ctl_table_header *iwcm_ctl_table_hdr; static struct ctl_table iwcm_ctl_table[] = …; /* * 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) { … } static void put_work(struct iwcm_work *work) { … } static void dealloc_work_entries(struct iwcm_id_private *cm_id_priv) { … } static int alloc_work_entries(struct iwcm_id_private *cm_id_priv, int count) { … } /* * 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) { … } static void free_cm_id(struct iwcm_id_private *cm_id_priv) { … } /* * Release a reference on cm_id. If the last reference is being * released, free the cm_id and return 'true'. */ static bool iwcm_deref_id(struct iwcm_id_private *cm_id_priv) { … } static void add_ref(struct iw_cm_id *cm_id) { … } static void rem_ref(struct iw_cm_id *cm_id) { … } 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) { … } EXPORT_SYMBOL(…); static int iwcm_modify_qp_err(struct ib_qp *qp) { … } /* * 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) { … } /* * 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) { … } EXPORT_SYMBOL(…); /* * CM_ID <-- DESTROYING * * Clean up all resources associated with the connection and release * the initial reference taken by iw_create_cm_id. * * Returns true if and only if the last cm_id_priv reference has been dropped. */ static bool destroy_cm_id(struct iw_cm_id *cm_id) { … } /* * 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) { … } EXPORT_SYMBOL(…); /** * 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) { … } /** * 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) { … } /* * 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) { … } EXPORT_SYMBOL(…); /* * 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) { … } EXPORT_SYMBOL(…); /* * 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) { … } EXPORT_SYMBOL(…); /* * 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) { … } EXPORT_SYMBOL(…); /* * 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) { … } /* * 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) { … } /* * 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) { … } /* * 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) { … } /* * 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) { … } static int process_event(struct iwcm_id_private *cm_id_priv, struct iw_cm_event *iw_event) { … } /* * 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) { … } /* * 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) { … } static int iwcm_init_qp_init_attr(struct iwcm_id_private *cm_id_priv, struct ib_qp_attr *qp_attr, int *qp_attr_mask) { … } static int iwcm_init_qp_rts_attr(struct iwcm_id_private *cm_id_priv, struct ib_qp_attr *qp_attr, int *qp_attr_mask) { … } int iw_cm_init_qp_attr(struct iw_cm_id *cm_id, struct ib_qp_attr *qp_attr, int *qp_attr_mask) { … } EXPORT_SYMBOL(…); static int __init iw_cm_init(void) { … } static void __exit iw_cm_cleanup(void) { … } MODULE_ALIAS_RDMA_NETLINK(…); module_init(…) …; module_exit(iw_cm_cleanup);
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