-/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
- * vim:expandtab:shiftwidth=8:tabstop=8:
- *
+/*
* GPL HEADER START
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* You should have received a copy of the GNU General Public License
* version 2 along with this program; If not, see
- * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
- *
- * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
- * CA 95054 USA or visit www.sun.com if you need additional information or
- * have any questions.
+ * http://www.gnu.org/licenses/gpl-2.0.html
*
* GPL HEADER END
*/
/*
- * Copyright 2008 Sun Microsystems, Inc. All rights reserved
+ * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
+ *
+ * Copyright (c) 2016, Intel Corporation.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
#ifndef __LNET_API_H__
#define __LNET_API_H__
-#include <lnet/types.h>
+/** \defgroup lnet LNet
+ *
+ * The Lustre Networking subsystem.
+ *
+ * LNet is an asynchronous message-passing API, which provides an unreliable
+ * connectionless service that can't guarantee any order. It supports OFA IB,
+ * TCP/IP, and Cray Portals, and routes between heterogeneous networks.
+ * @{
+ */
+
+#ifndef __KERNEL__
+# error This include is only for kernel use.
+#endif
-int LNetInit(void);
-void LNetFini(void);
+#include <lnet/types.h>
+/** \defgroup lnet_init_fini Initialization and cleanup
+ * The LNet must be properly initialized before any LNet calls can be made.
+ * @{ */
int LNetNIInit(lnet_pid_t requested_pid);
int LNetNIFini(void);
+/** @} lnet_init_fini */
-int LNetGetId(unsigned int index, lnet_process_id_t *id);
+/** \defgroup lnet_addr LNet addressing and basic types
+ *
+ * Addressing scheme and basic data types of LNet.
+ *
+ * The LNet API is memory-oriented, so LNet must be able to address not only
+ * end-points but also memory region within a process address space.
+ * An ::lnet_nid_t addresses an end-point. An ::lnet_pid_t identifies a process
+ * in a node. A portal represents an opening in the address space of a
+ * process. Match bits is criteria to identify a region of memory inside a
+ * portal, and offset specifies an offset within the memory region.
+ *
+ * LNet creates a table of portals for each process during initialization.
+ * This table has MAX_PORTALS entries and its size can't be dynamically
+ * changed. A portal stays empty until the owning process starts to add
+ * memory regions to it. A portal is sometimes called an index because
+ * it's an entry in the portals table of a process.
+ *
+ * \see LNetMEAttach
+ * @{ */
+int LNetGetId(unsigned int index, struct lnet_process_id *id);
int LNetDist(lnet_nid_t nid, lnet_nid_t *srcnid, __u32 *order);
-int LNetCtl(unsigned int cmd, void *arg);
-void LNetSnprintHandle (char *str, int str_len, lnet_handle_any_t handle);
+lnet_nid_t LNetPrimaryNID(lnet_nid_t nid);
+bool LNetIsPeerLocal(lnet_nid_t nid);
-/*
- * Portals
- */
-int LNetSetLazyPortal(int portal);
-int LNetClearLazyPortal(int portal);
+/** @} lnet_addr */
-/*
- * Match entries
- */
-int LNetMEAttach(unsigned int portal,
- lnet_process_id_t match_id_in,
- __u64 match_bits_in,
- __u64 ignore_bits_in,
- lnet_unlink_t unlink_in,
- lnet_ins_pos_t pos_in,
- lnet_handle_me_t *handle_out);
-
-int LNetMEInsert(lnet_handle_me_t current_in,
- lnet_process_id_t match_id_in,
- __u64 match_bits_in,
- __u64 ignore_bits_in,
- lnet_unlink_t unlink_in,
- lnet_ins_pos_t position_in,
- lnet_handle_me_t *handle_out);
-
-int LNetMEUnlink(lnet_handle_me_t current_in);
-/*
- * Memory descriptors
- */
-int LNetMDAttach(lnet_handle_me_t current_in,
- lnet_md_t md_in,
- lnet_unlink_t unlink_in,
- lnet_handle_md_t *handle_out);
-
-int LNetMDBind(lnet_md_t md_in,
- lnet_unlink_t unlink_in,
- lnet_handle_md_t *handle_out);
-
-int LNetMDUnlink(lnet_handle_md_t md_in);
-
-/*
- * Event queues
- */
-int LNetEQAlloc(unsigned int count_in,
+/** \defgroup lnet_me Match entries
+ *
+ * A match entry (abbreviated as ME) describes a set of criteria to accept
+ * incoming requests.
+ *
+ * A portal is essentially a match list plus a set of attributes. A match
+ * list is a chain of MEs. Each ME includes a pointer to a memory descriptor
+ * and a set of match criteria. The match criteria can be used to reject
+ * incoming requests based on process ID or the match bits provided in the
+ * request. MEs can be dynamically inserted into a match list by LNetMEAttach()
+ * and LNetMEInsert(), and removed from its list by LNetMEUnlink().
+ * @{ */
+int LNetMEAttach(unsigned int portal,
+ struct lnet_process_id match_id_in,
+ __u64 match_bits_in,
+ __u64 ignore_bits_in,
+ enum lnet_unlink unlink_in,
+ enum lnet_ins_pos pos_in,
+ struct lnet_handle_me *handle_out);
+
+int LNetMEInsert(struct lnet_handle_me current_in,
+ struct lnet_process_id match_id_in,
+ __u64 match_bits_in,
+ __u64 ignore_bits_in,
+ enum lnet_unlink unlink_in,
+ enum lnet_ins_pos position_in,
+ struct lnet_handle_me *handle_out);
+
+int LNetMEUnlink(struct lnet_handle_me current_in);
+/** @} lnet_me */
+
+/** \defgroup lnet_md Memory descriptors
+ *
+ * A memory descriptor contains information about a region of a user's
+ * memory (either in kernel or user space) and optionally points to an
+ * event queue where information about the operations performed on the
+ * memory descriptor are recorded. Memory descriptor is abbreviated as
+ * MD and can be used interchangeably with the memory region it describes.
+ *
+ * The LNet API provides two operations to create MDs: LNetMDAttach()
+ * and LNetMDBind(); one operation to unlink and release the resources
+ * associated with a MD: LNetMDUnlink().
+ * @{ */
+int LNetMDAttach(struct lnet_handle_me current_in,
+ struct lnet_md md_in,
+ enum lnet_unlink unlink_in,
+ struct lnet_handle_md *md_handle_out);
+
+int LNetMDBind(struct lnet_md md_in,
+ enum lnet_unlink unlink_in,
+ struct lnet_handle_md *md_handle_out);
+
+int LNetMDUnlink(struct lnet_handle_md md_in);
+/** @} lnet_md */
+
+/** \defgroup lnet_eq Events and event queues
+ *
+ * Event queues (abbreviated as EQ) are used to log operations performed on
+ * local MDs. In particular, they signal the completion of a data transmission
+ * into or out of a MD. They can also be used to hold acknowledgments for
+ * completed PUT operations and indicate when a MD has been unlinked. Multiple
+ * MDs can share a single EQ. An EQ may have an optional event handler
+ * associated with it. If an event handler exists, it will be run for each
+ * event that is deposited into the EQ.
+ *
+ * In addition to the struct lnet_handle_eq, the LNet API defines two types
+ * associated with events: The ::lnet_event_kind defines the kinds of events
+ * that can be stored in an EQ. The struct lnet_event defines a structure that
+ * holds the information about with an event.
+ *
+ * There are five functions for dealing with EQs: LNetEQAlloc() is used to
+ * create an EQ and allocate the resources needed, while LNetEQFree()
+ * releases these resources and free the EQ. LNetEQGet() retrieves the next
+ * event from an EQ, and LNetEQWait() can be used to block a process until
+ * an EQ has at least one event. LNetEQPoll() can be used to test or wait
+ * on multiple EQs.
+ * @{ */
+int LNetEQAlloc(unsigned int count_in,
lnet_eq_handler_t handler,
- lnet_handle_eq_t *handle_out);
+ struct lnet_handle_eq *handle_out);
-int LNetEQFree(lnet_handle_eq_t eventq_in);
+int LNetEQFree(struct lnet_handle_eq eventq_in);
-int LNetEQGet(lnet_handle_eq_t eventq_in,
- lnet_event_t *event_out);
+int LNetEQGet(struct lnet_handle_eq eventq_in,
+ struct lnet_event *event_out);
+int LNetEQWait(struct lnet_handle_eq eventq_in,
+ struct lnet_event *event_out);
-int LNetEQWait(lnet_handle_eq_t eventq_in,
- lnet_event_t *event_out);
+int LNetEQPoll(struct lnet_handle_eq *eventqs_in,
+ int neq_in,
+ signed long timeout,
+ struct lnet_event *event_out,
+ int *which_eq_out);
+/** @} lnet_eq */
-int LNetEQPoll(lnet_handle_eq_t *eventqs_in,
- int neq_in,
- int timeout_ms,
- lnet_event_t *event_out,
- int *which_eq_out);
+/** \defgroup lnet_data Data movement operations
+ *
+ * The LNet API provides two data movement operations: LNetPut()
+ * and LNetGet().
+ * @{ */
+int LNetPut(lnet_nid_t self,
+ struct lnet_handle_md md_in,
+ enum lnet_ack_req ack_req_in,
+ struct lnet_process_id target_in,
+ unsigned int portal_in,
+ __u64 match_bits_in,
+ unsigned int offset_in,
+ __u64 hdr_data_in);
-/*
- * Data movement
- */
-int LNetPut(lnet_nid_t self,
- lnet_handle_md_t md_in,
- lnet_ack_req_t ack_req_in,
- lnet_process_id_t target_in,
+int LNetGet(lnet_nid_t self,
+ struct lnet_handle_md md_in,
+ struct lnet_process_id target_in,
unsigned int portal_in,
- __u64 match_bits_in,
- unsigned int offset_in,
- __u64 hdr_data_in);
-
-int LNetGet(lnet_nid_t self,
- lnet_handle_md_t md_in,
- lnet_process_id_t target_in,
- unsigned int portal_in,
- __u64 match_bits_in,
+ __u64 match_bits_in,
unsigned int offset_in);
+/** @} lnet_data */
-int LNetSetAsync(lnet_process_id_t id, int nasync);
+/** \defgroup lnet_misc Miscellaneous operations.
+ * Miscellaneous operations.
+ * @{ */
-#ifndef __KERNEL__
-/* Temporary workaround to allow uOSS and test programs force server
- * mode in userspace. See comments near ln_server_mode_flag in
- * lnet/lib-types.h */
+int LNetSetLazyPortal(int portal);
+int LNetClearLazyPortal(int portal);
+int LNetCtl(unsigned int cmd, void *arg);
+void LNetDebugPeer(struct lnet_process_id id);
-void lnet_server_mode();
-#endif
+/** @} lnet_misc */
+/** @} lnet */
#endif
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