-/* -*- 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.
* in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU General Public License
- * version 2 along with this program; If not, see [sun.com URL with a
- * copy of GPLv2].
- *
- * 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.
+ * version 2 along with this program; If not, see
+ * 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, 2017, Intel Corporation.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
- * Lustre is a trademark of Sun Microsystems, Inc.
*/
#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 <uapi/linux/lnet/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);
-
-/*
- * Portals
- */
-int LNetSetLazyPortal(int portal);
-int LNetClearLazyPortal(int portal);
-
-/*
- * 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);
+lnet_nid_t LNetPrimaryNID(lnet_nid_t nid);
+bool LNetIsPeerLocal(lnet_nid_t nid);
-/*
- * 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,
- lnet_eq_handler_t handler,
- lnet_handle_eq_t *handle_out);
-
-int LNetEQFree(lnet_handle_eq_t eventq_in);
-
-int LNetEQGet(lnet_handle_eq_t eventq_in,
- lnet_event_t *event_out);
+/** @} lnet_addr */
-int LNetEQWait(lnet_handle_eq_t eventq_in,
- lnet_event_t *event_out);
-
-int LNetEQPoll(lnet_handle_eq_t *eventqs_in,
- int neq_in,
- int timeout_ms,
- lnet_event_t *event_out,
- int *which_eq_out);
-
-/*
- * 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,
+/** \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 must then be attached to an MD with LNetMDAttach().
+ * @{ */
+struct lnet_me *
+LNetMEAttach(unsigned int portal,
+ struct lnet_processid *match_id_in,
+ __u64 match_bits_in,
+ __u64 ignore_bits_in,
+ enum lnet_unlink unlink_in,
+ enum lnet_ins_pos pos_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_me *current_in,
+ const struct lnet_md *md_in,
+ enum lnet_unlink unlink_in,
+ struct lnet_handle_md *md_handle_out);
+
+int LNetMDBind(const 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, bool discard);
+#define LNetMDUnlink(handle) __LNetMDUnlink(handle, false)
+
+void lnet_assert_handler_unused(lnet_handler_t handler);
+/** @} lnet_md */
+
+/** \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);
+ __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,
- unsigned int offset_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,
+ bool recovery);
+/** @} 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);
+int LNetGetPeerDiscoveryStatus(void);
+int LNetAddPeer(lnet_nid_t *nids, __u32 num_nids);
-void lnet_server_mode();
-#endif
+/** @} lnet_misc */
+/** @} lnet */
#endif
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