951f7fc137
Document the reject sending and modifying QP to error done in rdma_accept(). Signed-off-by: Or Gerlitz <ogerlitz@voltaire.com> Signed-off-by: Sean Hefty <sean.hefty@intel.com> Signed-off-by: Roland Dreier <rolandd@cisco.com>
268 lines
8.5 KiB
C
268 lines
8.5 KiB
C
/*
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* Copyright (c) 2005 Voltaire Inc. All rights reserved.
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* Copyright (c) 2005 Intel Corporation. All rights reserved.
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*
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* This Software is licensed under one of the following licenses:
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*
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* 1) under the terms of the "Common Public License 1.0" a copy of which is
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* available from the Open Source Initiative, see
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* http://www.opensource.org/licenses/cpl.php.
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*
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* 2) under the terms of the "The BSD License" a copy of which is
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* available from the Open Source Initiative, see
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* http://www.opensource.org/licenses/bsd-license.php.
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*
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* 3) under the terms of the "GNU General Public License (GPL) Version 2" a
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* copy of which is available from the Open Source Initiative, see
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* http://www.opensource.org/licenses/gpl-license.php.
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*
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* Licensee has the right to choose one of the above licenses.
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*
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* Redistributions of source code must retain the above copyright
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* notice and one of the license notices.
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*
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* Redistributions in binary form must reproduce both the above copyright
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* notice, one of the license notices in the documentation
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* and/or other materials provided with the distribution.
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*
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*/
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#if !defined(RDMA_CM_H)
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#define RDMA_CM_H
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#include <linux/socket.h>
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#include <linux/in6.h>
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#include <rdma/ib_addr.h>
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#include <rdma/ib_sa.h>
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/*
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* Upon receiving a device removal event, users must destroy the associated
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* RDMA identifier and release all resources allocated with the device.
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*/
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enum rdma_cm_event_type {
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RDMA_CM_EVENT_ADDR_RESOLVED,
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RDMA_CM_EVENT_ADDR_ERROR,
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RDMA_CM_EVENT_ROUTE_RESOLVED,
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RDMA_CM_EVENT_ROUTE_ERROR,
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RDMA_CM_EVENT_CONNECT_REQUEST,
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RDMA_CM_EVENT_CONNECT_RESPONSE,
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RDMA_CM_EVENT_CONNECT_ERROR,
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RDMA_CM_EVENT_UNREACHABLE,
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RDMA_CM_EVENT_REJECTED,
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RDMA_CM_EVENT_ESTABLISHED,
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RDMA_CM_EVENT_DISCONNECTED,
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RDMA_CM_EVENT_DEVICE_REMOVAL,
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};
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enum rdma_port_space {
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RDMA_PS_SDP = 0x0001,
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RDMA_PS_TCP = 0x0106,
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RDMA_PS_UDP = 0x0111,
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RDMA_PS_SCTP = 0x0183
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};
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struct rdma_addr {
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struct sockaddr src_addr;
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u8 src_pad[sizeof(struct sockaddr_in6) -
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sizeof(struct sockaddr)];
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struct sockaddr dst_addr;
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u8 dst_pad[sizeof(struct sockaddr_in6) -
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sizeof(struct sockaddr)];
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struct rdma_dev_addr dev_addr;
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};
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struct rdma_route {
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struct rdma_addr addr;
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struct ib_sa_path_rec *path_rec;
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int num_paths;
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};
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struct rdma_cm_event {
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enum rdma_cm_event_type event;
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int status;
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void *private_data;
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u8 private_data_len;
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};
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struct rdma_cm_id;
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/**
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* rdma_cm_event_handler - Callback used to report user events.
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*
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* Notes: Users may not call rdma_destroy_id from this callback to destroy
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* the passed in id, or a corresponding listen id. Returning a
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* non-zero value from the callback will destroy the passed in id.
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*/
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typedef int (*rdma_cm_event_handler)(struct rdma_cm_id *id,
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struct rdma_cm_event *event);
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struct rdma_cm_id {
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struct ib_device *device;
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void *context;
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struct ib_qp *qp;
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rdma_cm_event_handler event_handler;
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struct rdma_route route;
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enum rdma_port_space ps;
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u8 port_num;
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};
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/**
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* rdma_create_id - Create an RDMA identifier.
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*
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* @event_handler: User callback invoked to report events associated with the
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* returned rdma_id.
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* @context: User specified context associated with the id.
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* @ps: RDMA port space.
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*/
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struct rdma_cm_id *rdma_create_id(rdma_cm_event_handler event_handler,
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void *context, enum rdma_port_space ps);
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/**
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* rdma_destroy_id - Destroys an RDMA identifier.
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*
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* @id: RDMA identifier.
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*
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* Note: calling this function has the effect of canceling in-flight
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* asynchronous operations associated with the id.
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*/
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void rdma_destroy_id(struct rdma_cm_id *id);
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/**
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* rdma_bind_addr - Bind an RDMA identifier to a source address and
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* associated RDMA device, if needed.
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*
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* @id: RDMA identifier.
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* @addr: Local address information. Wildcard values are permitted.
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*
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* This associates a source address with the RDMA identifier before calling
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* rdma_listen. If a specific local address is given, the RDMA identifier will
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* be bound to a local RDMA device.
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*/
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int rdma_bind_addr(struct rdma_cm_id *id, struct sockaddr *addr);
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/**
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* rdma_resolve_addr - Resolve destination and optional source addresses
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* from IP addresses to an RDMA address. If successful, the specified
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* rdma_cm_id will be bound to a local device.
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*
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* @id: RDMA identifier.
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* @src_addr: Source address information. This parameter may be NULL.
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* @dst_addr: Destination address information.
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* @timeout_ms: Time to wait for resolution to complete.
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*/
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int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
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struct sockaddr *dst_addr, int timeout_ms);
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/**
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* rdma_resolve_route - Resolve the RDMA address bound to the RDMA identifier
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* into route information needed to establish a connection.
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*
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* This is called on the client side of a connection.
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* Users must have first called rdma_resolve_addr to resolve a dst_addr
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* into an RDMA address before calling this routine.
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*/
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int rdma_resolve_route(struct rdma_cm_id *id, int timeout_ms);
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/**
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* rdma_create_qp - Allocate a QP and associate it with the specified RDMA
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* identifier.
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*
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* QPs allocated to an rdma_cm_id will automatically be transitioned by the CMA
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* through their states.
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*/
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int rdma_create_qp(struct rdma_cm_id *id, struct ib_pd *pd,
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struct ib_qp_init_attr *qp_init_attr);
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/**
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* rdma_destroy_qp - Deallocate the QP associated with the specified RDMA
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* identifier.
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*
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* Users must destroy any QP associated with an RDMA identifier before
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* destroying the RDMA ID.
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*/
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void rdma_destroy_qp(struct rdma_cm_id *id);
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/**
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* rdma_init_qp_attr - Initializes the QP attributes for use in transitioning
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* to a specified QP state.
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* @id: Communication identifier associated with the QP attributes to
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* initialize.
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* @qp_attr: On input, specifies the desired QP state. On output, the
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* mandatory and desired optional attributes will be set in order to
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* modify the QP to the specified state.
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* @qp_attr_mask: The QP attribute mask that may be used to transition the
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* QP to the specified state.
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*
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* Users must set the @qp_attr->qp_state to the desired QP state. This call
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* will set all required attributes for the given transition, along with
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* known optional attributes. Users may override the attributes returned from
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* this call before calling ib_modify_qp.
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*
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* Users that wish to have their QP automatically transitioned through its
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* states can associate a QP with the rdma_cm_id by calling rdma_create_qp().
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*/
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int rdma_init_qp_attr(struct rdma_cm_id *id, struct ib_qp_attr *qp_attr,
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int *qp_attr_mask);
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struct rdma_conn_param {
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const void *private_data;
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u8 private_data_len;
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u8 responder_resources;
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u8 initiator_depth;
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u8 flow_control;
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u8 retry_count; /* ignored when accepting */
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u8 rnr_retry_count;
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/* Fields below ignored if a QP is created on the rdma_cm_id. */
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u8 srq;
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u32 qp_num;
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enum ib_qp_type qp_type;
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};
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/**
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* rdma_connect - Initiate an active connection request.
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*
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* Users must have resolved a route for the rdma_cm_id to connect with
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* by having called rdma_resolve_route before calling this routine.
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*/
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int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param);
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/**
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* rdma_listen - This function is called by the passive side to
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* listen for incoming connection requests.
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*
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* Users must have bound the rdma_cm_id to a local address by calling
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* rdma_bind_addr before calling this routine.
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*/
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int rdma_listen(struct rdma_cm_id *id, int backlog);
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/**
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* rdma_accept - Called to accept a connection request or response.
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* @id: Connection identifier associated with the request.
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* @conn_param: Information needed to establish the connection. This must be
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* provided if accepting a connection request. If accepting a connection
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* response, this parameter must be NULL.
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*
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* Typically, this routine is only called by the listener to accept a connection
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* request. It must also be called on the active side of a connection if the
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* user is performing their own QP transitions.
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*
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* In the case of error, a reject message is sent to the remote side and the
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* state of the qp associated with the id is modified to error, such that any
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* previously posted receive buffers would be flushed.
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*/
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int rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param);
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/**
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* rdma_reject - Called to reject a connection request or response.
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*/
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int rdma_reject(struct rdma_cm_id *id, const void *private_data,
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u8 private_data_len);
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/**
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* rdma_disconnect - This function disconnects the associated QP and
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* transitions it into the error state.
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*/
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int rdma_disconnect(struct rdma_cm_id *id);
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#endif /* RDMA_CM_H */
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