508 строки
18 KiB
C
508 строки
18 KiB
C
/*
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* Copyright (c) 2004-2005 The Trustees of Indiana University.
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* All rights reserved.
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* Copyright (c) 2004-2005 The Trustees of the University of Tennessee.
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* All rights reserved.
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* Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
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* University of Stuttgart. All rights reserved.
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* Copyright (c) 2004-2005 The Regents of the University of California.
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* All rights reserved.
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* $COPYRIGHT$
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*
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* Additional copyrights may follow
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*
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* $HEADER$
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*/
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/**
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* @file
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*
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* Bit Mover Interface (BTL)
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*
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*
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* BTL Initialization:
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*
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* During library initialization, all available BTL components are
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* loaded and opened via their mca_base_open_component_fn_t
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* function. The BTL open function should register any mca parameters
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* used to tune/adjust the behaviour of the BTL (mca_base_param_register_int(),
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* mca_base_param_register_string()). Note that the open function may fail
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* if the resources (e.g. shared libraries, etc) required by the network
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* transport are not available.
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*
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* The mca_btl_base_component_init_fn_t() is then called for each of the
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* components that are succesfully opened. The component init function may
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* return either:
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*
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* (1) a NULL list of BTL modules if the transport is not available,
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* (2) a list containing a single BTL module, where the BTL provides
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* a layer of abstraction over multiple physical devices (e.g. NICs),
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* (3) a list containing multiple BTL modules where each BTL module
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* corresponds to a single physical device.
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*
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* During module initialization, the module should post any addressing
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* information required by its peers. An example would be the TCP
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* listen port opened by the TCP module for incoming connection
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* requests. This information is published to peers via the
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* mca_pml_base_modex_send() interface. Note that peer information is not
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* guaranteed to be available via mca_pml_base_modex_recv() during the
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* module's init function. However, it will be available during
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* BTL selection (mca_btl_base_add_proc_fn_t()).
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*
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* BTL Selection:
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*
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* The upper layer builds an ordered list of the available BTL modules sorted
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* by their exclusivity ranking. This is a relative ranking that is used
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* to determine the set of BTLs that may be used to reach a given destination.
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* During startup the BTL modules are queried via their
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* mca_btl_base_add_proc_fn_t() to determine if they are able to reach
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* a given destination. The BTL module with the highest ranking that
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* returns success is selected. Subsequent BTL modules are selected only
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* if they have the same exclusivity ranking.
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*
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* An example of how this might be used:
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*
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* BTL Exclusivity Comments
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* -------- ----------- ------------------
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* LO 100 Selected exclusively for local process
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* SM 50 Selected exclusively for other processes on host
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* IB 0 Selected based on network reachability
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* IB 0 Selected based on network reachability
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* TCP 0 Selected based on network reachability
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* TCP 0 Selected based on network reachability
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*
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* When a BTL module is selected, it may choose to optionally return a
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* pointer to an an mca_btl_base_endpoint_t data structure to the PML.
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* This pointer is treated as an opaque handle by the PML and is
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* returned to the BTL on subsequent data transfer calls to the
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* corresponding destination process. The actual contents of the
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* data structure are defined on a per BTL basis, and may be used to
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* cache addressing or connection information, such as a TCP socket
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* or IB queue pair.
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*
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* Progress:
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*
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* By default, the library provides for polling based progress of outstanding
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* requests. The BTL component exports an interface function (btlm_progress)
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* that is called in a polling mode by the PML during calls into the MPI
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* library. Note that the btlm_progress() function is called on the BTL component
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* rather than each BTL module. This implies that the BTL author is responsible
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* for iterating over the pending operations in each of the BTL modules associated
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* with the component.
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*
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* On platforms where threading support is provided, the library provides the
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* option of building with asynchronous threaded progress. In this case, the BTL
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* author is responsible for providing a thread to progress pending operations.
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* A thread is associated with the BTL component/module such that transport specific
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* functionality/APIs may be used to block the thread ubtll a pending operation
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* completes. This thread MUST NOT poll for completion as this would oversubscribe
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* the CPU.
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*
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* Note that in the threaded case the PML may choose to use a hybrid approach,
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* such that polling is implemented from the user thread for a fixed number of
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* cycles before relying on the background thread(s) to complete requests. If
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* possible the BTL should support the use of both modes concurrebtly.
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*
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*/
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#include "mca/mca.h"
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#ifndef MCA_BTL_H
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#define MCA_BTL_H
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#include "include/types.h"
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#include "class/ompi_free_list.h"
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/*
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* BTL types
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*/
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struct mca_btl_base_module_t;
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struct mca_btl_base_endpoint_t;
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struct mca_btl_base_descriptor_t;
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struct mca_mpool_base_resources_t;
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/* send/recv operations require tag matching */
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typedef uint8_t mca_btl_base_tag_t;
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/* reserved tag values */
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#define MCA_BTL_TAG_BTL 0
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#define MCA_BTL_TAG_PML 1
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#define MCA_BTL_TAG_USR 2
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#define MCA_BTL_TAG_MAX 255 /* 1 + highest allowed tag num */
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/* prefered protocol */
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#define MCA_BTL_FLAGS_SEND 1
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#define MCA_BTL_FLAGS_RDMA 2
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/**
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* Asynchronous callback function on completion of an operation.
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*/
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typedef void (*mca_btl_base_completion_fn_t)(
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struct mca_btl_base_module_t*,
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struct mca_btl_base_endpoint_t*,
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struct mca_btl_base_descriptor_t*,
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int status);
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/**
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* Describes a region/segment of memory that is addressable
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* by an BTL.
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*/
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struct mca_btl_base_segment_t {
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ompi_ptr_t seg_addr;
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uint32_t seg_len;
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union {
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uint32_t key32[2];
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uint64_t key64;
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uint8_t key8[8];
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} seg_key;
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};
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typedef struct mca_btl_base_segment_t mca_btl_base_segment_t;
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/**
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* A descriptor that holds the parameters to a send/put/get
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* operation along w/ a callback routine that is called on
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* completion of the request.
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*/
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struct mca_btl_base_descriptor_t {
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ompi_free_list_item_t super;
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mca_btl_base_segment_t *des_src;
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size_t des_src_cnt;
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mca_btl_base_segment_t *des_dst;
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size_t des_dst_cnt;
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mca_btl_base_completion_fn_t des_cbfunc;
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void* des_cbdata;
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void* des_context;
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int32_t des_flags;
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};
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typedef struct mca_btl_base_descriptor_t mca_btl_base_descriptor_t;
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OBJ_CLASS_DECLARATION(mca_btl_base_descriptor_t);
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#define MCA_BTL_DES_FLAGS_DEREGISTER 0x0001
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#define MCA_BTL_DES_FLAGS_PRIORITY 0x0002
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/**
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* Maximum number of allowed segments in src/dst fields of a descriptor.
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*/
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#define MCA_BTL_DES_MAX_SEGMENTS 16
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/*
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* BTL base header, stores the tag at a minimum
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*/
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struct mca_btl_base_header_t{
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mca_btl_base_tag_t tag;
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};
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typedef struct mca_btl_base_header_t mca_btl_base_header_t;
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/*
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* BTL component interface functions and datatype.
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*/
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/**
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* MCA->BTL Initializes the BTL component and creates specific BTL
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* module(s).
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*
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* @param num_btls (OUT) Returns the number of btl modules created, or 0
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* if the transport is not available.
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*
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* @param enable_progress_threads (IN) Whether this component is
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* allowed to run a hidden/progress thread or not.
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*
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* @param enable_mpi_threads (IN) Whether support for multiple MPI
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* threads is enabled or not (i.e., MPI_THREAD_MULTIPLE), which
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* indicates whether multiple threads may invoke this component
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* simultaneously or not.
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*
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* @return Array of pointers to BTL modules, or NULL if the transport
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* is not available.
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*
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* During component initialization, the BTL component should discover
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* the physical devices that are available for the given transport,
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* and create a BTL module to represent each device. Any addressing
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* information required by peers to reach the device should be published
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* during this function via the mca_pml_base_modex_send() interface.
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*
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*/
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typedef struct mca_btl_base_module_t** (*mca_btl_base_component_init_fn_t)(
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int *num_btls,
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bool enable_progress_threads,
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bool enable_mpi_threads
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);
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/**
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* MCA->BTL Called to progress outstanding requests for
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* non-threaded polling environments.
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*
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* @param tstamp Current time.
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* @return OMPI_SUCCESS or error code on failure.
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*/
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typedef int (*mca_btl_base_component_progress_fn_t)(void);
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/**
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* BTL component descriptor. Contains component version information
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* and component open/close/init functions.
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*/
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struct mca_btl_base_component_1_0_0_t {
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mca_base_component_t btl_version;
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mca_base_component_data_1_0_0_t btl_data;
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mca_btl_base_component_init_fn_t btl_init;
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mca_btl_base_component_progress_fn_t btl_progress;
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};
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typedef struct mca_btl_base_component_1_0_0_t mca_btl_base_component_1_0_0_t;
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typedef struct mca_btl_base_component_1_0_0_t mca_btl_base_component_t;
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/*
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* BTL module interface functions and datatype.
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*/
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/**
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* MCA->BTL Clean up any resources held by BTL module
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* before the module is unloaded.
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*
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* @param btl (IN) BTL module.
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*
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* Prior to unloading a BTL module, the MCA framework will call
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* the BTL finalize method of the module. Any resources held by
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* the BTL should be released and if required the memory corresponding
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* to the BTL module freed.
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*
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*/
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typedef int (*mca_btl_base_module_finalize_fn_t)(
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struct mca_btl_base_module_t* btl
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);
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/**
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* PML->BTL notification of change in the process list.
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*
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* @param btl (IN) BTL module
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* @param nprocs (IN) Number of processes
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* @param procs (IN) Set of processes
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* @param endpoint (OUT) Set of (optional) mca_btl_base_endpoint_t structures by BTL.
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* @param reachable (OUT) Bitmask indicating set of peer processes that are reachable by this BTL.
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* @return OMPI_SUCCESS or error status on failure.
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*
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* The mca_btl_base_module_add_procs_fn_t() is called by the PML to
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* determine the set of BTLs that should be used to reach each process.
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* Any addressing information exported by the peer via the mca_pml_base_modex_send()
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* function should be available during this call via the corresponding
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* mca_pml_base_modex_recv() function. The BTL may utilize this information to
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* determine reachability of each peer process.
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*
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* For each process that is reachable by the BTL, the bit corresponding to the index
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* into the proc array (nprocs) should be set in the reachable bitmask. The PML
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* provides the BTL the option to return a pointer to a data structure defined
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* by the BTL that is returned to the BTL on subsequent calls to the BTL data
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* transfer functions (e.g btl_send). This may be used by the BTL to cache any addressing
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* or connection information (e.g. TCP socket, IP queue pair).
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*/
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typedef int (*mca_btl_base_module_add_procs_fn_t)(
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struct mca_btl_base_module_t* btl,
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size_t nprocs,
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struct ompi_proc_t** procs,
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struct mca_btl_base_endpoint_t** endpoints,
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struct ompi_bitmap_t* reachable
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);
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/**
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* Notification of change to the process list.
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*
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* @param btl (IN) BTL module
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* @param nprocs (IN) Number of processes
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* @param proc (IN) Set of processes
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* @param peer (IN) Set of peer addressing information.
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* @return Status indicating if cleanup was successful
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*
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* When the process list changes, the PML notifies the BTL of the
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* change, to provide the opportunity to cleanup or release any
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* resources associated with the peer.
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*/
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typedef int (*mca_btl_base_module_del_procs_fn_t)(
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struct mca_btl_base_module_t* btl,
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size_t nprocs,
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struct ompi_proc_t** procs,
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struct mca_btl_base_endpoint_t**
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);
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/**
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* Callback function that is called asynchronously on receipt
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* of data by the transport layer.
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*/
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typedef void (*mca_btl_base_module_recv_cb_fn_t)(
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struct mca_btl_base_module_t* btl,
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mca_btl_base_tag_t tag,
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mca_btl_base_descriptor_t* descriptor,
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void* cbdata
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);
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/**
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* Register a callback function that is called on receipt
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* of a fragment.
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*
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* @param btl (IN) BTL module
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* @return Status indicating if cleanup was successful
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*
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* When the process list changes, the PML notifies the BTL of the
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* change, to provide the opportunity to cleanup or release any
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* resources associated with the peer.
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*/
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typedef int (*mca_btl_base_module_register_fn_t)(
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struct mca_btl_base_module_t* btl,
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mca_btl_base_tag_t tag,
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mca_btl_base_module_recv_cb_fn_t cbfunc,
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void* cbdata
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);
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/**
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* Allocate a descriptor with a segment of the requested size.
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* Note that the BTL layer may choose to return a smaller size
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* if it cannot support the request.
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*
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* @param btl (IN) BTL module
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* @param size (IN) Request segment size.
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*/
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typedef mca_btl_base_descriptor_t* (*mca_btl_base_module_alloc_fn_t)(
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struct mca_btl_base_module_t* btl,
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size_t size
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);
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/**
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* Return a descriptor allocated from this BTL via alloc/prepare.
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*
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* @param btl (IN) BTL module
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* @param segment (IN) Descriptor allocated from the BTL
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*/
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typedef int (*mca_btl_base_module_free_fn_t)(
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struct mca_btl_base_module_t* btl,
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mca_btl_base_descriptor_t* descriptor
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);
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/**
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* Prepare a descriptor for send/rdma using the supplied
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* convertor. If the convertor references data that is contigous,
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* the descriptor may simply point to the user buffer. Otherwise,
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* this routine is responsible for allocating buffer space and
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* packing if required.
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*
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* @param btl (IN) BTL module
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* @param endpoint (IN) BTL peer addressing
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* @param convertor (IN) Data type convertor
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* @param reserve (IN) Additional bytes requested by upper layer to precede user data
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* @param size (IN/OUT) Number of bytes to prepare (IN), number of bytes actually prepared (OUT)
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*/
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typedef struct mca_btl_base_descriptor_t* (*mca_btl_base_module_prepare_fn_t)(
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struct mca_btl_base_module_t* btl,
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struct mca_btl_base_endpoint_t* endpoint,
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mca_mpool_base_registration_t* registration,
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struct ompi_convertor_t* convertor,
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size_t reserve,
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size_t* size
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);
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/**
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* Initiate an asynchronous send.
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*
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* @param btl (IN) BTL module
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* @param endpoint (IN) BTL addressing information
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* @param descriptor (IN) Description of the data to be transfered
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* @param tag (IN) The tag value used to notify the peer.
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*/
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typedef int (*mca_btl_base_module_send_fn_t)(
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struct mca_btl_base_module_t* btl,
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struct mca_btl_base_endpoint_t* endpoint,
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struct mca_btl_base_descriptor_t* descriptor,
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mca_btl_base_tag_t tag
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);
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/**
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* Initiate an asynchronous put.
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*
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* @param btl (IN) BTL module
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* @param endpoint (IN) BTL addressing information
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* @param descriptor (IN) Description of the data to be transferred
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*/
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typedef int (*mca_btl_base_module_put_fn_t)(
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struct mca_btl_base_module_t* btl,
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struct mca_btl_base_endpoint_t* endpoint,
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struct mca_btl_base_descriptor_t* descriptor
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);
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/**
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* Initiate an asynchronous get.
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*
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* @param btl (IN) BTL module
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* @param endpoint (IN) BTL addressing information
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* @param descriptor (IN) Description of the data to be transferred
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*
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*/
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typedef int (*mca_btl_base_module_get_fn_t)(
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struct mca_btl_base_module_t* btl,
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struct mca_btl_base_endpoint_t* endpoint,
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struct mca_btl_base_descriptor_t* descriptor
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);
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/**
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* BTL module interface functions and attributes.
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*/
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struct mca_btl_base_module_t {
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/* BTL common attributes */
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mca_btl_base_component_t* btl_component; /**< pointer back to the BTL component structure */
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size_t btl_eager_limit; /**< maximum size of first fragment -- eager send */
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size_t btl_min_send_size; /**< threshold below which the BTL should not fragment */
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size_t btl_max_send_size; /**< maximum send fragment size supported by the BTL */
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size_t btl_min_rdma_size; /**< threshold below which the BTL should not fragment */
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size_t btl_max_rdma_size; /**< maximum rdma fragment size supported by the BTL */
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uint32_t btl_exclusivity; /**< indicates this BTL should be used exclusively */
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uint32_t btl_latency; /**< relative ranking of latency used to prioritize btls */
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uint32_t btl_bandwidth; /**< bandwidth (Mbytes/sec) supported by each endpoint */
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uint32_t btl_flags; /**< flags (put/get...) */
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/* BTL function table */
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mca_btl_base_module_add_procs_fn_t btl_add_procs;
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mca_btl_base_module_del_procs_fn_t btl_del_procs;
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mca_btl_base_module_register_fn_t btl_register;
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mca_btl_base_module_finalize_fn_t btl_finalize;
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mca_btl_base_module_alloc_fn_t btl_alloc;
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mca_btl_base_module_free_fn_t btl_free;
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mca_btl_base_module_prepare_fn_t btl_prepare_src;
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mca_btl_base_module_prepare_fn_t btl_prepare_dst;
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mca_btl_base_module_send_fn_t btl_send;
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mca_btl_base_module_put_fn_t btl_put;
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mca_btl_base_module_get_fn_t btl_get;
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};
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typedef struct mca_btl_base_module_t mca_btl_base_module_t;
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/*
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* Macro for use in modules that are of type btl v1.0.0
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*/
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#define MCA_BTL_BASE_VERSION_1_0_0 \
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/* coll v1.0 is chained to MCA v1.0 */ \
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MCA_BASE_VERSION_1_0_0, \
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/* btl v1.0 */ \
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"btl", 1, 0, 0
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#endif /* OMPI_MCA_BTL_H */
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