linux-stable/include/rdma/rdma_cm.h
Leon Romanovsky 6bf9d8f6f0 RDMA/include: Replace license text with SPDX tags
The header files in RDMA subsystem are dual licensed and can be
described by simple SPDX tag, so replace all of them at once
together with making them use the same coding style for header
guard defines.

Link: https://lore.kernel.org/r/20200719072521.135260-1-leon@kernel.org
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
2020-07-29 14:48:36 -03:00

404 lines
14 KiB
C

/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
/*
* Copyright (c) 2005 Voltaire Inc. All rights reserved.
* Copyright (c) 2005 Intel Corporation. All rights reserved.
*/
#ifndef RDMA_CM_H
#define RDMA_CM_H
#include <linux/socket.h>
#include <linux/in6.h>
#include <rdma/ib_addr.h>
#include <rdma/ib_sa.h>
#include <uapi/rdma/rdma_user_cm.h>
/*
* Upon receiving a device removal event, users must destroy the associated
* RDMA identifier and release all resources allocated with the device.
*/
enum rdma_cm_event_type {
RDMA_CM_EVENT_ADDR_RESOLVED,
RDMA_CM_EVENT_ADDR_ERROR,
RDMA_CM_EVENT_ROUTE_RESOLVED,
RDMA_CM_EVENT_ROUTE_ERROR,
RDMA_CM_EVENT_CONNECT_REQUEST,
RDMA_CM_EVENT_CONNECT_RESPONSE,
RDMA_CM_EVENT_CONNECT_ERROR,
RDMA_CM_EVENT_UNREACHABLE,
RDMA_CM_EVENT_REJECTED,
RDMA_CM_EVENT_ESTABLISHED,
RDMA_CM_EVENT_DISCONNECTED,
RDMA_CM_EVENT_DEVICE_REMOVAL,
RDMA_CM_EVENT_MULTICAST_JOIN,
RDMA_CM_EVENT_MULTICAST_ERROR,
RDMA_CM_EVENT_ADDR_CHANGE,
RDMA_CM_EVENT_TIMEWAIT_EXIT
};
const char *__attribute_const__ rdma_event_msg(enum rdma_cm_event_type event);
#define RDMA_IB_IP_PS_MASK 0xFFFFFFFFFFFF0000ULL
#define RDMA_IB_IP_PS_TCP 0x0000000001060000ULL
#define RDMA_IB_IP_PS_UDP 0x0000000001110000ULL
#define RDMA_IB_IP_PS_IB 0x00000000013F0000ULL
struct rdma_addr {
struct sockaddr_storage src_addr;
struct sockaddr_storage dst_addr;
struct rdma_dev_addr dev_addr;
};
struct rdma_route {
struct rdma_addr addr;
struct sa_path_rec *path_rec;
int num_paths;
};
struct rdma_conn_param {
const void *private_data;
u8 private_data_len;
u8 responder_resources;
u8 initiator_depth;
u8 flow_control;
u8 retry_count; /* ignored when accepting */
u8 rnr_retry_count;
/* Fields below ignored if a QP is created on the rdma_cm_id. */
u8 srq;
u32 qp_num;
u32 qkey;
};
struct rdma_ud_param {
const void *private_data;
u8 private_data_len;
struct rdma_ah_attr ah_attr;
u32 qp_num;
u32 qkey;
};
struct rdma_cm_event {
enum rdma_cm_event_type event;
int status;
union {
struct rdma_conn_param conn;
struct rdma_ud_param ud;
} param;
struct rdma_ucm_ece ece;
};
struct rdma_cm_id;
/**
* rdma_cm_event_handler - Callback used to report user events.
*
* Notes: Users may not call rdma_destroy_id from this callback to destroy
* the passed in id, or a corresponding listen id. Returning a
* non-zero value from the callback will destroy the passed in id.
*/
typedef int (*rdma_cm_event_handler)(struct rdma_cm_id *id,
struct rdma_cm_event *event);
struct rdma_cm_id {
struct ib_device *device;
void *context;
struct ib_qp *qp;
rdma_cm_event_handler event_handler;
struct rdma_route route;
enum rdma_ucm_port_space ps;
enum ib_qp_type qp_type;
u8 port_num;
};
struct rdma_cm_id *__rdma_create_id(struct net *net,
rdma_cm_event_handler event_handler,
void *context, enum rdma_ucm_port_space ps,
enum ib_qp_type qp_type,
const char *caller);
/**
* rdma_create_id - Create an RDMA identifier.
*
* @net: The network namespace in which to create the new id.
* @event_handler: User callback invoked to report events associated with the
* returned rdma_id.
* @context: User specified context associated with the id.
* @ps: RDMA port space.
* @qp_type: type of queue pair associated with the id.
*
* Returns a new rdma_cm_id. The id holds a reference on the network
* namespace until it is destroyed.
*
* The event handler callback serializes on the id's mutex and is
* allowed to sleep.
*/
#define rdma_create_id(net, event_handler, context, ps, qp_type) \
__rdma_create_id((net), (event_handler), (context), (ps), (qp_type), \
KBUILD_MODNAME)
/**
* rdma_destroy_id - Destroys an RDMA identifier.
*
* @id: RDMA identifier.
*
* Note: calling this function has the effect of canceling in-flight
* asynchronous operations associated with the id.
*/
void rdma_destroy_id(struct rdma_cm_id *id);
/**
* rdma_bind_addr - Bind an RDMA identifier to a source address and
* associated RDMA device, if needed.
*
* @id: RDMA identifier.
* @addr: Local address information. Wildcard values are permitted.
*
* This associates a source address with the RDMA identifier before calling
* rdma_listen. If a specific local address is given, the RDMA identifier will
* be bound to a local RDMA device.
*/
int rdma_bind_addr(struct rdma_cm_id *id, struct sockaddr *addr);
/**
* rdma_resolve_addr - Resolve destination and optional source addresses
* from IP addresses to an RDMA address. If successful, the specified
* rdma_cm_id will be bound to a local device.
*
* @id: RDMA identifier.
* @src_addr: Source address information. This parameter may be NULL.
* @dst_addr: Destination address information.
* @timeout_ms: Time to wait for resolution to complete.
*/
int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
const struct sockaddr *dst_addr,
unsigned long timeout_ms);
/**
* rdma_resolve_route - Resolve the RDMA address bound to the RDMA identifier
* into route information needed to establish a connection.
*
* This is called on the client side of a connection.
* Users must have first called rdma_resolve_addr to resolve a dst_addr
* into an RDMA address before calling this routine.
*/
int rdma_resolve_route(struct rdma_cm_id *id, unsigned long timeout_ms);
/**
* rdma_create_qp - Allocate a QP and associate it with the specified RDMA
* identifier.
*
* QPs allocated to an rdma_cm_id will automatically be transitioned by the CMA
* through their states.
*/
int rdma_create_qp(struct rdma_cm_id *id, struct ib_pd *pd,
struct ib_qp_init_attr *qp_init_attr);
/**
* rdma_destroy_qp - Deallocate the QP associated with the specified RDMA
* identifier.
*
* Users must destroy any QP associated with an RDMA identifier before
* destroying the RDMA ID.
*/
void rdma_destroy_qp(struct rdma_cm_id *id);
/**
* rdma_init_qp_attr - Initializes the QP attributes for use in transitioning
* to a specified QP state.
* @id: Communication identifier associated with the QP attributes to
* initialize.
* @qp_attr: On input, specifies the desired QP state. On output, the
* mandatory and desired optional attributes will be set in order to
* modify the QP to the specified state.
* @qp_attr_mask: The QP attribute mask that may be used to transition the
* QP to the specified state.
*
* Users must set the @qp_attr->qp_state to the desired QP state. This call
* will set all required attributes for the given transition, along with
* known optional attributes. Users may override the attributes returned from
* this call before calling ib_modify_qp.
*
* Users that wish to have their QP automatically transitioned through its
* states can associate a QP with the rdma_cm_id by calling rdma_create_qp().
*/
int rdma_init_qp_attr(struct rdma_cm_id *id, struct ib_qp_attr *qp_attr,
int *qp_attr_mask);
/**
* rdma_connect - Initiate an active connection request.
* @id: Connection identifier to connect.
* @conn_param: Connection information used for connected QPs.
*
* Users must have resolved a route for the rdma_cm_id to connect with
* by having called rdma_resolve_route before calling this routine.
*
* This call will either connect to a remote QP or obtain remote QP
* information for unconnected rdma_cm_id's. The actual operation is
* based on the rdma_cm_id's port space.
*/
int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param);
int rdma_connect_ece(struct rdma_cm_id *id, struct rdma_conn_param *conn_param,
struct rdma_ucm_ece *ece);
/**
* rdma_listen - This function is called by the passive side to
* listen for incoming connection requests.
*
* Users must have bound the rdma_cm_id to a local address by calling
* rdma_bind_addr before calling this routine.
*/
int rdma_listen(struct rdma_cm_id *id, int backlog);
int __rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param,
const char *caller);
int __rdma_accept_ece(struct rdma_cm_id *id, struct rdma_conn_param *conn_param,
const char *caller, struct rdma_ucm_ece *ece);
/**
* rdma_accept - Called to accept a connection request or response.
* @id: Connection identifier associated with the request.
* @conn_param: Information needed to establish the connection. This must be
* provided if accepting a connection request. If accepting a connection
* response, this parameter must be NULL.
*
* Typically, this routine is only called by the listener to accept a connection
* request. It must also be called on the active side of a connection if the
* user is performing their own QP transitions.
*
* In the case of error, a reject message is sent to the remote side and the
* state of the qp associated with the id is modified to error, such that any
* previously posted receive buffers would be flushed.
*/
#define rdma_accept(id, conn_param) \
__rdma_accept((id), (conn_param), KBUILD_MODNAME)
/**
* rdma_notify - Notifies the RDMA CM of an asynchronous event that has
* occurred on the connection.
* @id: Connection identifier to transition to established.
* @event: Asynchronous event.
*
* This routine should be invoked by users to notify the CM of relevant
* communication events. Events that should be reported to the CM and
* when to report them are:
*
* IB_EVENT_COMM_EST - Used when a message is received on a connected
* QP before an RTU has been received.
*/
int rdma_notify(struct rdma_cm_id *id, enum ib_event_type event);
/**
* rdma_reject - Called to reject a connection request or response.
*/
int rdma_reject(struct rdma_cm_id *id, const void *private_data,
u8 private_data_len, u8 reason);
/**
* rdma_disconnect - This function disconnects the associated QP and
* transitions it into the error state.
*/
int rdma_disconnect(struct rdma_cm_id *id);
/**
* rdma_join_multicast - Join the multicast group specified by the given
* address.
* @id: Communication identifier associated with the request.
* @addr: Multicast address identifying the group to join.
* @join_state: Multicast JoinState bitmap requested by port.
* Bitmap is based on IB_SA_MCMEMBER_REC_JOIN_STATE bits.
* @context: User-defined context associated with the join request, returned
* to the user through the private_data pointer in multicast events.
*/
int rdma_join_multicast(struct rdma_cm_id *id, struct sockaddr *addr,
u8 join_state, void *context);
/**
* rdma_leave_multicast - Leave the multicast group specified by the given
* address.
*/
void rdma_leave_multicast(struct rdma_cm_id *id, struct sockaddr *addr);
/**
* rdma_set_service_type - Set the type of service associated with a
* connection identifier.
* @id: Communication identifier to associated with service type.
* @tos: Type of service.
*
* The type of service is interpretted as a differentiated service
* field (RFC 2474). The service type should be specified before
* performing route resolution, as existing communication on the
* connection identifier may be unaffected. The type of service
* requested may not be supported by the network to all destinations.
*/
void rdma_set_service_type(struct rdma_cm_id *id, int tos);
/**
* rdma_set_reuseaddr - Allow the reuse of local addresses when binding
* the rdma_cm_id.
* @id: Communication identifier to configure.
* @reuse: Value indicating if the bound address is reusable.
*
* Reuse must be set before an address is bound to the id.
*/
int rdma_set_reuseaddr(struct rdma_cm_id *id, int reuse);
/**
* rdma_set_afonly - Specify that listens are restricted to the
* bound address family only.
* @id: Communication identifer to configure.
* @afonly: Value indicating if listens are restricted.
*
* Must be set before identifier is in the listening state.
*/
int rdma_set_afonly(struct rdma_cm_id *id, int afonly);
int rdma_set_ack_timeout(struct rdma_cm_id *id, u8 timeout);
/**
* rdma_get_service_id - Return the IB service ID for a specified address.
* @id: Communication identifier associated with the address.
* @addr: Address for the service ID.
*/
__be64 rdma_get_service_id(struct rdma_cm_id *id, struct sockaddr *addr);
/**
* rdma_reject_msg - return a pointer to a reject message string.
* @id: Communication identifier that received the REJECT event.
* @reason: Value returned in the REJECT event status field.
*/
const char *__attribute_const__ rdma_reject_msg(struct rdma_cm_id *id,
int reason);
/**
* rdma_consumer_reject_data - return the consumer reject private data and
* length, if any.
* @id: Communication identifier that received the REJECT event.
* @ev: RDMA CM reject event.
* @data_len: Pointer to the resulting length of the consumer data.
*/
const void *rdma_consumer_reject_data(struct rdma_cm_id *id,
struct rdma_cm_event *ev, u8 *data_len);
/**
* rdma_read_gids - Return the SGID and DGID used for establishing
* connection. This can be used after rdma_resolve_addr()
* on client side. This can be use on new connection
* on server side. This is applicable to IB, RoCE, iWarp.
* If cm_id is not bound yet to the RDMA device, it doesn't
* copy and SGID or DGID to the given pointers.
* @id: Communication identifier whose GIDs are queried.
* @sgid: Pointer to SGID where SGID will be returned. It is optional.
* @dgid: Pointer to DGID where DGID will be returned. It is optional.
* Note: This API should not be used by any new ULPs or new code.
* Instead, users interested in querying GIDs should refer to path record
* of the rdma_cm_id to query the GIDs.
* This API is provided for compatibility for existing users.
*/
void rdma_read_gids(struct rdma_cm_id *cm_id, union ib_gid *sgid,
union ib_gid *dgid);
struct iw_cm_id *rdma_iw_cm_id(struct rdma_cm_id *cm_id);
struct rdma_cm_id *rdma_res_to_id(struct rdma_restrack_entry *res);
#endif /* RDMA_CM_H */