ib_cm.h

来自「linux 内核源代码」· C头文件 代码 · 共 592 行 · 第 1/2 页

 * ib_create_cm_id - Allocate a communication identifier.
 * @device: Device associated with the cm_id.  All related communication will
 * be associated with the specified device.
 * @cm_handler: Callback invoked to notify the user of CM events.
 * @context: User specified context associated with the communication
 *   identifier.
 *
 * Communication identifiers are used to track connection states, service
 * ID resolution requests, and listen requests.
 */
struct ib_cm_id *ib_create_cm_id(struct ib_device *device,
				 ib_cm_handler cm_handler,
				 void *context);

/**
 * ib_destroy_cm_id - Destroy a connection identifier.
 * @cm_id: Connection identifier to destroy.
 *
 * This call blocks until the connection identifier is destroyed.
 */
void ib_destroy_cm_id(struct ib_cm_id *cm_id);

#define IB_SERVICE_ID_AGN_MASK	__constant_cpu_to_be64(0xFF00000000000000ULL)
#define IB_CM_ASSIGN_SERVICE_ID __constant_cpu_to_be64(0x0200000000000000ULL)
#define IB_CMA_SERVICE_ID	__constant_cpu_to_be64(0x0000000001000000ULL)
#define IB_CMA_SERVICE_ID_MASK	__constant_cpu_to_be64(0xFFFFFFFFFF000000ULL)
#define IB_SDP_SERVICE_ID	__constant_cpu_to_be64(0x0000000000010000ULL)
#define IB_SDP_SERVICE_ID_MASK	__constant_cpu_to_be64(0xFFFFFFFFFFFF0000ULL)

struct ib_cm_compare_data {
	u8  data[IB_CM_COMPARE_SIZE];
	u8  mask[IB_CM_COMPARE_SIZE];
};

/**
 * ib_cm_listen - Initiates listening on the specified service ID for
 *   connection and service ID resolution requests.
 * @cm_id: Connection identifier associated with the listen request.
 * @service_id: Service identifier matched against incoming connection
 *   and service ID resolution requests.  The service ID should be specified
 *   network-byte order.  If set to IB_CM_ASSIGN_SERVICE_ID, the CM will
 *   assign a service ID to the caller.
 * @service_mask: Mask applied to service ID used to listen across a
 *   range of service IDs.  If set to 0, the service ID is matched
 *   exactly.  This parameter is ignored if %service_id is set to
 *   IB_CM_ASSIGN_SERVICE_ID.
 * @compare_data: This parameter is optional.  It specifies data that must
 *   appear in the private data of a connection request for the specified
 *   listen request.
 */
int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask,
		 struct ib_cm_compare_data *compare_data);

struct ib_cm_req_param {
	struct ib_sa_path_rec	*primary_path;
	struct ib_sa_path_rec	*alternate_path;
	__be64			service_id;
	u32			qp_num;
	enum ib_qp_type		qp_type;
	u32			starting_psn;
	const void		*private_data;
	u8			private_data_len;
	u8			peer_to_peer;
	u8			responder_resources;
	u8			initiator_depth;
	u8			remote_cm_response_timeout;
	u8			flow_control;
	u8			local_cm_response_timeout;
	u8			retry_count;
	u8			rnr_retry_count;
	u8			max_cm_retries;
	u8			srq;
};

/**
 * ib_send_cm_req - Sends a connection request to the remote node.
 * @cm_id: Connection identifier that will be associated with the
 *   connection request.
 * @param: Connection request information needed to establish the
 *   connection.
 */
int ib_send_cm_req(struct ib_cm_id *cm_id,
		   struct ib_cm_req_param *param);

struct ib_cm_rep_param {
	u32		qp_num;
	u32		starting_psn;
	const void	*private_data;
	u8		private_data_len;
	u8		responder_resources;
	u8		initiator_depth;
	u8		failover_accepted;
	u8		flow_control;
	u8		rnr_retry_count;
	u8		srq;
};

/**
 * ib_send_cm_rep - Sends a connection reply in response to a connection
 *   request.
 * @cm_id: Connection identifier that will be associated with the
 *   connection request.
 * @param: Connection reply information needed to establish the
 *   connection.
 */
int ib_send_cm_rep(struct ib_cm_id *cm_id,
		   struct ib_cm_rep_param *param);

/**
 * ib_send_cm_rtu - Sends a connection ready to use message in response
 *   to a connection reply message.
 * @cm_id: Connection identifier associated with the connection request.
 * @private_data: Optional user-defined private data sent with the
 *   ready to use message.
 * @private_data_len: Size of the private data buffer, in bytes.
 */
int ib_send_cm_rtu(struct ib_cm_id *cm_id,
		   const void *private_data,
		   u8 private_data_len);

/**
 * ib_send_cm_dreq - Sends a disconnection request for an existing
 *   connection.
 * @cm_id: Connection identifier associated with the connection being
 *   released.
 * @private_data: Optional user-defined private data sent with the
 *   disconnection request message.
 * @private_data_len: Size of the private data buffer, in bytes.
 */
int ib_send_cm_dreq(struct ib_cm_id *cm_id,
		    const void *private_data,
		    u8 private_data_len);

/**
 * ib_send_cm_drep - Sends a disconnection reply to a disconnection request.
 * @cm_id: Connection identifier associated with the connection being
 *   released.
 * @private_data: Optional user-defined private data sent with the
 *   disconnection reply message.
 * @private_data_len: Size of the private data buffer, in bytes.
 *
 * If the cm_id is in the correct state, the CM will transition the connection
 * to the timewait state, even if an error occurs sending the DREP message.
 */
int ib_send_cm_drep(struct ib_cm_id *cm_id,
		    const void *private_data,
		    u8 private_data_len);

/**
 * ib_cm_notify - Notifies the CM of an event reported to the consumer.
 * @cm_id: Connection identifier to transition to established.
 * @event: Type of 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.
 * IB_EVENT_PATH_MIG - Notifies the CM that the connection has failed over
 *   to the alternate path.
 */
int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event);

/**
 * ib_send_cm_rej - Sends a connection rejection message to the
 *   remote node.
 * @cm_id: Connection identifier associated with the connection being
 *   rejected.
 * @reason: Reason for the connection request rejection.
 * @ari: Optional additional rejection information.
 * @ari_length: Size of the additional rejection information, in bytes.
 * @private_data: Optional user-defined private data sent with the
 *   rejection message.
 * @private_data_len: Size of the private data buffer, in bytes.
 */
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);

#define IB_CM_MRA_FLAG_DELAY 0x80  /* Send MRA only after a duplicate msg */

/**
 * ib_send_cm_mra - Sends a message receipt acknowledgement to a connection
 *   message.
 * @cm_id: Connection identifier associated with the connection message.
 * @service_timeout: The lower 5-bits specify the maximum time required for
 *   the sender to reply to to the connection message.  The upper 3-bits
 *   specify additional control flags.
 * @private_data: Optional user-defined private data sent with the
 *   message receipt acknowledgement.
 * @private_data_len: Size of the private data buffer, in bytes.
 */
int ib_send_cm_mra(struct ib_cm_id *cm_id,
		   u8 service_timeout,
		   const void *private_data,
		   u8 private_data_len);

/**
 * ib_send_cm_lap - Sends a load alternate path request.
 * @cm_id: Connection identifier associated with the load alternate path
 *   message.
 * @alternate_path: A path record that identifies the alternate path to
 *   load.
 * @private_data: Optional user-defined private data sent with the
 *   load alternate path message.
 * @private_data_len: Size of the private data buffer, in bytes.
 */
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);

/**
 * ib_cm_init_qp_attr - Initializes the QP attributes for use in transitioning
 *   to a specified QP state.
 * @cm_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.
 */
int ib_cm_init_qp_attr(struct ib_cm_id *cm_id,
		       struct ib_qp_attr *qp_attr,
		       int *qp_attr_mask);

/**
 * ib_send_cm_apr - Sends an alternate path response message in response to
 *   a load alternate path request.
 * @cm_id: Connection identifier associated with the alternate path response.
 * @status: Reply status sent with the alternate path response.
 * @info: Optional additional information sent with the alternate path
 *   response.
 * @info_length: Size of the additional information, in bytes.
 * @private_data: Optional user-defined private data sent with the
 *   alternate path response message.
 * @private_data_len: Size of the private data buffer, in bytes.
 */
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 ib_cm_sidr_req_param {
	struct ib_sa_path_rec	*path;
	__be64			service_id;
	int			timeout_ms;
	const void		*private_data;
	u8			private_data_len;
	u8			max_cm_retries;
};

/**
 * ib_send_cm_sidr_req - Sends a service ID resolution request to the
 *   remote node.
 * @cm_id: Communication identifier that will be associated with the
 *   service ID resolution request.
 * @param: Service ID resolution request information.
 */
int ib_send_cm_sidr_req(struct ib_cm_id *cm_id,
			struct ib_cm_sidr_req_param *param);

struct ib_cm_sidr_rep_param {
	u32			qp_num;
	u32			qkey;
	enum ib_cm_sidr_status	status;
	const void		*info;
	u8			info_length;
	const void		*private_data;
	u8			private_data_len;
};

/**
 * ib_send_cm_sidr_rep - Sends a service ID resolution reply to the
 *   remote node.
 * @cm_id: Communication identifier associated with the received service ID
 *   resolution request.
 * @param: Service ID resolution reply information.
 */
int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id,
			struct ib_cm_sidr_rep_param *param);

#endif /* IB_CM_H */