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29 * This file is part of Lustre, http://www.lustre.org/
32 #ifndef __LNET_API_H__
33 #define __LNET_API_H__
35 /** \defgroup lnet LNet
37 * The Lustre Networking subsystem.
39 * LNet is an asynchronous message-passing API, which provides an unreliable
40 * connectionless service that can't guarantee any order. It supports OFA IB,
41 * TCP/IP, and Cray Portals, and routes between heterogeneous networks.
46 # error This include is only for kernel use.
49 #include <uapi/linux/lnet/lnet-types.h>
51 /** \defgroup lnet_init_fini Initialization and cleanup
52 * The LNet must be properly initialized before any LNet calls can be made.
54 int LNetNIInit(lnet_pid_t requested_pid);
56 /** @} lnet_init_fini */
58 /** \defgroup lnet_addr LNet addressing and basic types
60 * Addressing scheme and basic data types of LNet.
62 * The LNet API is memory-oriented, so LNet must be able to address not only
63 * end-points but also memory region within a process address space.
64 * An ::lnet_nid_t addresses an end-point. An ::lnet_pid_t identifies a process
65 * in a node. A portal represents an opening in the address space of a
66 * process. Match bits is criteria to identify a region of memory inside a
67 * portal, and offset specifies an offset within the memory region.
69 * LNet creates a table of portals for each process during initialization.
70 * This table has MAX_PORTALS entries and its size can't be dynamically
71 * changed. A portal stays empty until the owning process starts to add
72 * memory regions to it. A portal is sometimes called an index because
73 * it's an entry in the portals table of a process.
77 int LNetGetId(unsigned int index, struct lnet_processid *id, bool large_nids);
78 int LNetDist(struct lnet_nid *nid, struct lnet_nid *srcnid, __u32 *order);
79 void LNetPrimaryNID(struct lnet_nid *nid);
80 bool LNetIsPeerLocal(struct lnet_nid *nid);
81 bool LNetPeerDiscovered(struct lnet_nid *nid);
86 /** \defgroup lnet_me Match entries
88 * A match entry (abbreviated as ME) describes a set of criteria to accept
91 * A portal is essentially a match list plus a set of attributes. A match
92 * list is a chain of MEs. Each ME includes a pointer to a memory descriptor
93 * and a set of match criteria. The match criteria can be used to reject
94 * incoming requests based on process ID or the match bits provided in the
95 * request. MEs can be dynamically inserted into a match list by LNetMEAttach(),
96 * and must then be attached to an MD with LNetMDAttach().
99 LNetMEAttach(unsigned int portal,
100 struct lnet_processid *match_id_in,
102 __u64 ignore_bits_in,
103 enum lnet_unlink unlink_in,
104 enum lnet_ins_pos pos_in);
107 /** \defgroup lnet_md Memory descriptors
109 * A memory descriptor contains information about a region of a user's
110 * memory (either in kernel or user space) and optionally points to an
111 * event queue where information about the operations performed on the
112 * memory descriptor are recorded. Memory descriptor is abbreviated as
113 * MD and can be used interchangeably with the memory region it describes.
115 * The LNet API provides two operations to create MDs: LNetMDAttach()
116 * and LNetMDBind(); one operation to unlink and release the resources
117 * associated with a MD: LNetMDUnlink().
119 int LNetMDAttach(struct lnet_me *current_in,
120 const struct lnet_md *md_in,
121 enum lnet_unlink unlink_in,
122 struct lnet_handle_md *md_handle_out);
124 int LNetMDBind(const struct lnet_md *md_in,
125 enum lnet_unlink unlink_in,
126 struct lnet_handle_md *md_handle_out);
128 int __LNetMDUnlink(struct lnet_handle_md md_in, bool discard);
129 #define LNetMDUnlink(handle) __LNetMDUnlink(handle, false)
131 bool lnet_assert_handler_unused(lnet_handler_t handler, bool assert);
134 /** \defgroup lnet_data Data movement operations
136 * The LNet API provides two data movement operations: LNetPut()
139 int LNetPut(struct lnet_nid *self,
140 struct lnet_handle_md md_in,
141 enum lnet_ack_req ack_req_in,
142 struct lnet_processid *target_in,
143 unsigned int portal_in,
145 unsigned int offset_in,
148 int LNetGet(struct lnet_nid *self,
149 struct lnet_handle_md md_in,
150 struct lnet_processid *target_in,
151 unsigned int portal_in,
153 unsigned int offset_in,
158 /** \defgroup lnet_misc Miscellaneous operations.
159 * Miscellaneous operations.
162 int LNetSetLazyPortal(int portal);
163 int LNetClearLazyPortal(int portal);
164 int LNetCtl(unsigned int cmd, void *arg);
165 void LNetDebugPeer(struct lnet_processid *id);
166 int LNetGetPeerDiscoveryStatus(void);
167 int LNetAddPeer(struct lnet_nid *nids, u32 num_nids);