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openmpi/opal/mca/btl/btl.h
Nathan Hjelm 1b564f62bd Revert "Merge pull request #275 from hjelmn/btlmod" 
This reverts commit ccaecf0fd6, reversing
changes made to 6a19bf85dd.
2014-11-19 23:22:43 -07:00

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C
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/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil -*- */
/*
* Copyright (c) 2004-2007 The Trustees of Indiana University and Indiana
* University Research and Technology
* Corporation. All rights reserved.
* Copyright (c) 2004-2008 The University of Tennessee and The University
* of Tennessee Research Foundation. All rights
* reserved.
* Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
* University of Stuttgart. All rights reserved.
* Copyright (c) 2004-2005 The Regents of the University of California.
* All rights reserved.
* Copyright (c) 2006-2014 Los Alamos National Security, LLC. All rights
* reserved.
* Copyright (c) 2010 Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2012-2013 NVIDIA Corporation. All rights reserved.
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
/**
* @file
*
* Byte Transfer Layer (BTL)
*
*
* BTL Initialization:
*
* During library initialization, all available BTL components are
* loaded and opened via their mca_base_open_component_fn_t
* function. The BTL open function should register any mca parameters
* used to tune/adjust the behaviour of the BTL (mca_base_var_register()
* mca_base_component_var_register()). Note that the open function may fail
* if the resources (e.g. shared libraries, etc) required by the network
* transport are not available.
*
* The mca_btl_base_component_init_fn_t() is then called for each of the
* components that are succesfully opened. The component init function may
* return either:
*
* (1) a NULL list of BTL modules if the transport is not available,
* (2) a list containing a one or more single BTL modules, where the BTL provides
* a layer of abstraction over one or more physical devices (e.g. NICs),
*
* During module initialization, the module should post any addressing
* information required by its peers. An example would be the TCP
* listen port opened by the TCP module for incoming connection
* requests. This information is published to peers via the
* modex_send() interface. Note that peer information is not
* guaranteed to be available via modex_recv() during the
* module's init function. However, it will be available during
* BTL selection (mca_btl_base_add_proc_fn_t()).
*
* BTL Selection:
*
* The upper layer builds an ordered list of the available BTL modules sorted
* by their exclusivity ranking. This is a relative ranking that is used
* to determine the set of BTLs that may be used to reach a given destination.
* During startup the BTL modules are queried via their
* mca_btl_base_add_proc_fn_t() to determine if they are able to reach
* a given destination. The BTL module with the highest ranking that
* returns success is selected. Subsequent BTL modules are selected only
* if they have the same exclusivity ranking.
*
* An example of how this might be used:
*
* BTL Exclusivity Comments
* -------- ----------- ------------------
* LO 100 Selected exclusively for local process
* SM 50 Selected exclusively for other processes on host
* IB 0 Selected based on network reachability
* IB 0 Selected based on network reachability
* TCP 0 Selected based on network reachability
* TCP 0 Selected based on network reachability
*
* When mca_btl_base_add_proc_fn_t() is called on a BTL module, the BTL
* will populate an OUT variable with mca_btl_base_endpoint_t pointers.
* Each pointer is treated as an opaque handle by the upper layer and is
* returned to the BTL on subsequent data transfer calls to the
* corresponding destination process. The actual contents of the
* data structure are defined on a per BTL basis, and may be used to
* cache addressing or connection information, such as a TCP socket
* or IB queue pair.
*
* Progress:
*
* By default, the library provides for polling based progress of outstanding
* requests. The BTL component exports an interface function (btl_progress)
* that is called in a polling mode by the PML during calls into the MPI
* library. Note that the btl_progress() function is called on the BTL component
* rather than each BTL module. This implies that the BTL author is responsible
* for iterating over the pending operations in each of the BTL modules associated
* with the component.
*
* On platforms where threading support is provided, the library provides the
* option of building with asynchronous threaded progress. In this case, the BTL
* author is responsible for providing a thread to progress pending operations.
* A thread is associated with the BTL component/module such that transport specific
* functionality/APIs may be used to block the thread until a pending operation
* completes. This thread MUST NOT poll for completion as this would oversubscribe
* the CPU.
*
* Note that in the threaded case the PML may choose to use a hybrid approach,
* such that polling is implemented from the user thread for a fixed number of
* cycles before relying on the background thread(s) to complete requests. If
* possible the BTL should support the use of both modes concurrently.
*
*/
#ifndef OPAL_MCA_BTL_H
#define OPAL_MCA_BTL_H
#include "opal_config.h"
#include "opal/types.h"
#include "opal/prefetch.h" /* For OPAL_LIKELY */
#include "opal/class/opal_bitmap.h"
#include "opal/datatype/opal_convertor.h"
#include "opal/mca/mca.h"
#include "opal/mca/mpool/mpool.h"
#include "opal/mca/crs/crs.h"
#include "opal/mca/crs/base/base.h"
BEGIN_C_DECLS
/*
* BTL types
*/
struct mca_btl_base_module_t;
struct mca_btl_base_endpoint_t;
struct mca_btl_base_descriptor_t;
struct mca_mpool_base_resources_t;
struct opal_proc_t;
/* send/recv operations require tag matching */
typedef uint8_t mca_btl_base_tag_t;
#define MCA_BTL_NO_ORDER 255
/*
* Communication specific defines. There are a number of active message ID
* that can be shred between all frameworks that need to communicate (i.e.
* use the PML or the BTL directly). These ID are exchanged between the
* processes, therefore they need to be identical everywhere. The simplest
* approach is to have them defined as constants, and give each framework a
* small number. Here is the rule that defines these ID (they are 8 bits):
* - the first 3 bits are used to code the framework (i.e. PML, OSC, COLL)
* - the remaining 5 bytes are used internally by the framework, and divided
* based on the components requirements. Therefore, the way the PML and
* the OSC frameworks use these defines will be different. For more
* information about how these framework ID are defined, take a look in the
* header file associated with the framework.
*/
#define MCA_BTL_AM_FRAMEWORK_MASK 0xD0
#define MCA_BTL_TAG_BTL 0x20
#define MCA_BTL_TAG_PML 0x40
#define MCA_BTL_TAG_OSC_RDMA 0x60
#define MCA_BTL_TAG_USR 0x80
#define MCA_BTL_TAG_MAX 255 /* 1 + highest allowed tag num */
/*
* Reserved tags for specific BTLs. As multiple BTLs can be active
* simultaneously, their tags should not collide.
*/
#define MCA_BTL_TAG_IB (MCA_BTL_TAG_BTL + 0)
#define MCA_BTL_TAG_UDAPL (MCA_BTL_TAG_BTL + 1)
#define MCA_BTL_TAG_SMCUDA (MCA_BTL_TAG_BTL + 2)
/* prefered protocol */
#define MCA_BTL_FLAGS_SEND 0x0001
#define MCA_BTL_FLAGS_PUT 0x0002
#define MCA_BTL_FLAGS_GET 0x0004
#define MCA_BTL_FLAGS_RDMA (MCA_BTL_FLAGS_GET|MCA_BTL_FLAGS_PUT)
/* btl can send directly from user buffer w/out registration */
#define MCA_BTL_FLAGS_SEND_INPLACE 0x0008
/* btl transport reliability flags - currently used only by the DR PML */
#define MCA_BTL_FLAGS_NEED_ACK 0x0010
#define MCA_BTL_FLAGS_NEED_CSUM 0x0020
/** RDMA put/get calls must have a matching prepare_{src,dst} call
on the target with the same base (and possibly bound). */
#define MCA_BTL_FLAGS_RDMA_MATCHED 0x0040
/* btl needs local rdma completion */
#define MCA_BTL_FLAGS_RDMA_COMPLETION 0x0080
/* btl can do heterogeneous rdma operations on byte buffers */
#define MCA_BTL_FLAGS_HETEROGENEOUS_RDMA 0x0100
/* btl can support failover if enabled */
#define MCA_BTL_FLAGS_FAILOVER_SUPPORT 0x0200
#define MCA_BTL_FLAGS_CUDA_PUT 0x0400
#define MCA_BTL_FLAGS_CUDA_GET 0x0800
#define MCA_BTL_FLAGS_CUDA_RDMA (MCA_BTL_FLAGS_CUDA_GET|MCA_BTL_FLAGS_CUDA_PUT)
#define MCA_BTL_FLAGS_CUDA_COPY_ASYNC_SEND 0x1000
#define MCA_BTL_FLAGS_CUDA_COPY_ASYNC_RECV 0x2000
/* btl can support signaled operations. BTLs that support this flag are
* expected to provide a mechanism for asynchronous progress on descriptors
* where the feature is requested. BTLs should also be aware that users can
* (and probably will) turn this flag on and off using the MCA variable
* system.
*/
#define MCA_BTL_FLAGS_SIGNALED 0x4000
/* Default exclusivity levels */
#define MCA_BTL_EXCLUSIVITY_HIGH (64*1024) /* internal loopback */
#define MCA_BTL_EXCLUSIVITY_DEFAULT 1024 /* GM/IB/etc. */
#define MCA_BTL_EXCLUSIVITY_LOW 0 /* TCP used as a last resort */
/* error callback flags */
#define MCA_BTL_ERROR_FLAGS_FATAL 0x1
#define MCA_BTL_ERROR_FLAGS_NONFATAL 0x2
#define MCA_BTL_ERROR_FLAGS_ADD_CUDA_IPC 0x4
/**
* Asynchronous callback function on completion of an operation.
* Completion Semantics: The descriptor can be reused or returned to the
* BTL via mca_btl_base_module_free_fn_t. The operation has been queued to
* the network device or will otherwise make asynchronous progress without
* subsequent calls to btl_progress.
*
* @param[IN] module the BTL module
* @param[IN] endpoint the BTL endpoint
* @param[IN] descriptor the BTL descriptor
*
*/
typedef void (*mca_btl_base_completion_fn_t)(
struct mca_btl_base_module_t* module,
struct mca_btl_base_endpoint_t* endpoint,
struct mca_btl_base_descriptor_t* descriptor,
int status);
/**
* Describes a region/segment of memory that is addressable
* by an BTL.
*
* Note: In many cases the alloc and prepare methods of BTLs
* do not return a mca_btl_base_segment_t but instead return a
* subclass. Extreme care should be used when modifying
* BTL segments to prevent overwriting internal BTL data.
*
* All BTLs MUST use base segments when calling registered
* Callbacks.
*
* BTL MUST use mca_btl_base_segment_t or a subclass and
* MUST store their segment length in btl_seg_size. BTLs
* MUST specify a segment no larger than MCA_BTL_SEG_MAX_SIZE.
*/
struct mca_btl_base_segment_t {
/** Address of the memory */
opal_ptr_t seg_addr;
/** Length in bytes */
uint64_t seg_len;
};
typedef struct mca_btl_base_segment_t mca_btl_base_segment_t;
/**
* A descriptor that holds the parameters to a send/put/get
* operation along w/ a callback routine that is called on
* completion of the request.
* Note: receive callbacks will store the incomming data segments in
* des_local
*/
struct mca_btl_base_descriptor_t {
ompi_free_list_item_t super;
mca_btl_base_segment_t *des_local; /**< local segments */
size_t des_local_count; /**< number of local segments */
mca_btl_base_segment_t *des_remote; /**< remote segments */
size_t des_remote_count; /**< number of destination segments */
mca_btl_base_completion_fn_t des_cbfunc; /**< local callback function */
void* des_cbdata; /**< opaque callback data */
void* des_context; /**< more opaque callback data */
uint32_t des_flags; /**< hints to BTL */
/** order value, this is only
valid in the local completion callback
and may be used in subsequent calls to
btl_alloc, btl_prepare_src/dst to request
a descriptor that will be ordered w.r.t.
this descriptor
*/
uint8_t order;
};
typedef struct mca_btl_base_descriptor_t mca_btl_base_descriptor_t;
OPAL_DECLSPEC OBJ_CLASS_DECLARATION(mca_btl_base_descriptor_t);
#define MCA_BTL_DES_FLAGS_PRIORITY 0x0001
/* Allow the BTL to dispose the descriptor once the callback
* associated was triggered.
*/
#define MCA_BTL_DES_FLAGS_BTL_OWNERSHIP 0x0002
/* Allow the BTL to avoid calling the descriptor callback
* if the send succeded in the btl_send (i.e in the fast path).
*/
#define MCA_BTL_DES_SEND_ALWAYS_CALLBACK 0x0004
/* Tell the PML that the copy is being done asynchronously
*/
#define MCA_BTL_DES_FLAGS_CUDA_COPY_ASYNC 0x0008
/* Type of transfer that will be done with this frag.
*/
#define MCA_BTL_DES_FLAGS_PUT 0x0010
#define MCA_BTL_DES_FLAGS_GET 0x0020
/* Ask the BTL to wake the remote process (send/sendi) or local process
* (put/get) to handle this message. The BTL may ignore this flag if
* signaled operations are not supported.
*/
#define MCA_BTL_DES_FLAGS_SIGNAL 0x0040
/**
* Maximum number of allowed segments in src/dst fields of a descriptor.
*/
#define MCA_BTL_DES_MAX_SEGMENTS 16
/**
* Maximum size of a BTL segment (NTH: does it really save us anything
* to hardcode this?)
*/
#define MCA_BTL_SEG_MAX_SIZE 256
/*
* BTL base header, stores the tag at a minimum
*/
struct mca_btl_base_header_t{
mca_btl_base_tag_t tag;
};
typedef struct mca_btl_base_header_t mca_btl_base_header_t;
#define MCA_BTL_BASE_HEADER_HTON(hdr)
#define MCA_BTL_BASE_HEADER_NTOH(hdr)
/*
* BTL component interface functions and datatype.
*/
/**
* MCA->BTL Initializes the BTL component and creates specific BTL
* module(s).
*
* @param num_btls (OUT) Returns the number of btl modules created, or 0
* if the transport is not available.
*
* @param enable_progress_threads (IN) Whether this component is
* allowed to run a hidden/progress thread or not.
*
* @param enable_mpi_threads (IN) Whether support for multiple MPI
* threads is enabled or not (i.e., MPI_THREAD_MULTIPLE), which
* indicates whether multiple threads may invoke this component
* simultaneously or not.
*
* @return Array of pointers to BTL modules, or NULL if the transport
* is not available.
*
* During component initialization, the BTL component should discover
* the physical devices that are available for the given transport,
* and create a BTL module to represent each device. Any addressing
* information required by peers to reach the device should be published
* during this function via the modex_send() interface.
*
*/
typedef struct mca_btl_base_module_t** (*mca_btl_base_component_init_fn_t)(
int *num_btls,
bool enable_progress_threads,
bool enable_mpi_threads
);
/**
* MCA->BTL Called to progress outstanding requests for
* non-threaded polling environments.
*
* @return Count of "completions", a metric of
* how many items where completed in the call
* to progress.
*/
typedef int (*mca_btl_base_component_progress_fn_t)(void);
/**
* Callback function that is called asynchronously on receipt
* of data by the transport layer.
* Note that the the mca_btl_base_descriptor_t is only valid within the
* completion function, this implies that all data payload in the
* mca_btl_base_descriptor_t must be copied out within this callback or
* forfeited back to the BTL.
* Note also that descriptor segments (des_local) must be base
* segments for all callbacks.
*
* @param[IN] btl BTL module
* @param[IN] tag The active message receive callback tag value
* @param[IN] descriptor The BTL descriptor (contains the receive payload)
* @param[IN] cbdata Opaque callback data
*/
typedef void (*mca_btl_base_module_recv_cb_fn_t)(
struct mca_btl_base_module_t* btl,
mca_btl_base_tag_t tag,
mca_btl_base_descriptor_t* descriptor,
void* cbdata
);
typedef struct mca_btl_active_message_callback_t {
mca_btl_base_module_recv_cb_fn_t cbfunc;
void* cbdata;
} mca_btl_active_message_callback_t;
OPAL_DECLSPEC extern
mca_btl_active_message_callback_t mca_btl_base_active_message_trigger[MCA_BTL_TAG_MAX];
/**
* BTL component descriptor. Contains component version information
* and component open/close/init functions.
*/
struct mca_btl_base_component_2_0_0_t {
mca_base_component_t btl_version;
mca_base_component_data_t btl_data;
mca_btl_base_component_init_fn_t btl_init;
mca_btl_base_component_progress_fn_t btl_progress;
};
typedef struct mca_btl_base_component_2_0_0_t mca_btl_base_component_2_0_0_t;
typedef struct mca_btl_base_component_2_0_0_t mca_btl_base_component_t;
/* add the 1_0_0_t typedef for source compatibility
* we can do this safely because 1_0_0 components are the same as
* 1_0_1 components, the difference is in the btl module.
* Fortunately the only difference in the module is an additional interface
* function added to 1_0_1. We can therefore safely treat an older module just
* just like the new one so long as we check the component version
* prior to invoking the new interface function.
*/
typedef struct mca_btl_base_component_2_0_0_t mca_btl_base_component_1_0_1_t;
typedef struct mca_btl_base_component_2_0_0_t mca_btl_base_component_1_0_0_t;
/*
* BTL module interface functions and datatype.
*/
/**
* MCA->BTL Clean up any resources held by BTL module
* before the module is unloaded.
*
* @param btl (IN) BTL module.
* @return OPAL_SUCCESS or error status on failure.
*
* Prior to unloading a BTL module, the MCA framework will call
* the BTL finalize method of the module. Any resources held by
* the BTL should be released and if required the memory corresponding
* to the BTL module freed.
*
*/
typedef int (*mca_btl_base_module_finalize_fn_t)(
struct mca_btl_base_module_t* btl
);
/**
* BML->BTL notification of change in the process list.
*
* @param btl (IN) BTL module
* @param nprocs (IN) Number of processes
* @param procs (IN) Array of processes
* @param endpoint (OUT) Array of mca_btl_base_endpoint_t structures by BTL.
* @param reachable (OUT) Bitmask indicating set of peer processes that are reachable by this BTL.
* @return OPAL_SUCCESS or error status on failure.
*
* The mca_btl_base_module_add_procs_fn_t() is called by the BML to
* determine the set of BTLs that should be used to reach each process.
* Any addressing information exported by the peer via the modex_send()
* function should be available during this call via the corresponding
* modex_recv() function. The BTL may utilize this information to
* determine reachability of each peer process.
*
* For each process that is reachable by the BTL, the bit corresponding to the index
* into the proc array (nprocs) should be set in the reachable bitmask. The BTL
* will return an array of pointers to a data structure defined
* by the BTL that is then returned to the BTL on subsequent calls to the BTL data
* transfer functions (e.g btl_send). This may be used by the BTL to cache any addressing
* or connection information (e.g. TCP socket, IB queue pair).
*/
typedef int (*mca_btl_base_module_add_procs_fn_t)(
struct mca_btl_base_module_t* btl,
size_t nprocs,
struct opal_proc_t** procs,
struct mca_btl_base_endpoint_t** endpoints,
struct opal_bitmap_t* reachable
);
/**
* Notification of change to the process list.
*
* @param btl (IN) BTL module
* @param nprocs (IN) Number of processes
* @param proc (IN) Set of processes
* @param peer (IN) Set of peer addressing information.
* @return Status indicating if cleanup was successful
*
* When the process list changes, the BML notifies the BTL of the
* change, to provide the opportunity to cleanup or release any
* resources associated with the peer.
*/
typedef int (*mca_btl_base_module_del_procs_fn_t)(
struct mca_btl_base_module_t* btl,
size_t nprocs,
struct opal_proc_t** procs,
struct mca_btl_base_endpoint_t** peer
);
/**
* Register a callback function that is called on receipt
* of a fragment.
*
* @param[IN] btl BTL module
* @param[IN] tag tag value of this callback
* (specified on subsequent send operations)
* @param[IN] cbfunc The callback function
* @param[IN] cbdata Opaque callback data
*
* @return OPAL_SUCCESS The callback was registered successfully
* @return OPAL_ERROR The callback was NOT registered successfully
*
*/
typedef int (*mca_btl_base_module_register_fn_t)(
struct mca_btl_base_module_t* btl,
mca_btl_base_tag_t tag,
mca_btl_base_module_recv_cb_fn_t cbfunc,
void* cbdata
);
/**
* Callback function that is called asynchronously on receipt
* of an error from the transport layer
*
* @param[IN] btl BTL module
* @param[IN] flags type of error
* @param[IN] errproc process that had an error
* @param[IN] btlinfo descriptive string from the BTL
*/
typedef void (*mca_btl_base_module_error_cb_fn_t)(
struct mca_btl_base_module_t* btl,
int32_t flags,
struct opal_proc_t* errproc,
char* btlinfo
);
/**
* Register a callback function that is called on receipt
* of an error.
*
* @param[IN] btl BTL module
* @param[IN] cbfunc The callback function
*
* @return OPAL_SUCCESS The callback was registered successfully
* @return OPAL_ERROR The callback was NOT registered successfully
*
*/
typedef int (*mca_btl_base_module_register_error_fn_t)(
struct mca_btl_base_module_t* btl,
mca_btl_base_module_error_cb_fn_t cbfunc
);
/**
* Allocate a descriptor with a segment of the requested size.
* Note that the BTL layer may choose to return a smaller size
* if it cannot support the request. The order tag value ensures that
* operations on the descriptor that is allocated will be
* ordered w.r.t. a previous operation on a particular descriptor.
* Ordering is only guaranteed if the previous descriptor had its
* local completion callback function called and the order tag of
* that descriptor is only valid upon the local completion callback function.
*
*
* @param btl (IN) BTL module
* @param size (IN) Request segment size.
* @param order (IN) The ordering tag (may be MCA_BTL_NO_ORDER)
*/
typedef mca_btl_base_descriptor_t* (*mca_btl_base_module_alloc_fn_t)(
struct mca_btl_base_module_t* btl,
struct mca_btl_base_endpoint_t* endpoint,
uint8_t order,
size_t size,
uint32_t flags
);
/**
* Return a descriptor allocated from this BTL via alloc/prepare.
* A descriptor can only be deallocated after its local completion
* callback function has called for all send/put/get operations.
*
* @param btl (IN) BTL module
* @param segment (IN) Descriptor allocated from the BTL
*/
typedef int (*mca_btl_base_module_free_fn_t)(
struct mca_btl_base_module_t* btl,
mca_btl_base_descriptor_t* descriptor
);
/**
* Prepare a descriptor for send/put/get using the supplied
* convertor. If the convertor references data that is contiguous,
* the descriptor may simply point to the user buffer. Otherwise,
* this routine is responsible for allocating buffer space and
* packing if required.
*
* The descriptor returned can be used in multiple concurrent operations
* (send/put/get) unless the BTL has the MCA_BTL_FLAGS_RDMA_MATCHED flag set
* in which case a corresponding prepare call must accompany the put/get call
* in addition, the address and length that is put/get must match the address
* and length which is prepared.
*
* The order tag value ensures that operations on the
* descriptor that is prepared will be ordered w.r.t. a previous
* operation on a particular descriptor. Ordering is only guaranteed if
* the previous descriptor had its local completion callback function
* called and the order tag of that descriptor is only valid upon the local
* completion callback function.
*
* @param btl (IN) BTL module
* @param endpoint (IN) BTL peer addressing
* @param registration (IN) Memory registration
* @param convertor (IN) Data type convertor
* @param order (IN) The ordering tag (may be MCA_BTL_NO_ORDER)
* @param reserve (IN) Additional bytes requested by upper layer to precede user data
* @param size (IN/OUT) Number of bytes to prepare (IN),
* number of bytes actually prepared (OUT)
*
*/
typedef struct mca_btl_base_descriptor_t* (*mca_btl_base_module_prepare_fn_t)(
struct mca_btl_base_module_t* btl,
struct mca_btl_base_endpoint_t* endpoint,
mca_mpool_base_registration_t* registration,
struct opal_convertor_t* convertor,
uint8_t order,
size_t reserve,
size_t* size,
uint32_t flags
);
/**
* Initiate an asynchronous send.
* Completion Semantics: the descriptor has been queued for a send operation
* the BTL now controls the descriptor until local
* completion callback is made on the descriptor
*
* All BTLs allow multiple concurrent asynchronous send operations on a descriptor
*
* @param btl (IN) BTL module
* @param endpoint (IN) BTL addressing information
* @param descriptor (IN) Description of the data to be transfered
* @param tag (IN) The tag value used to notify the peer.
*
* @retval OPAL_SUCCESS The descriptor was successfully queued for a send
* @retval OPAL_ERROR The descriptor was NOT successfully queued for a send
* @retval OPAL_ERR_UNREACH The endpoint is not reachable
*/
typedef int (*mca_btl_base_module_send_fn_t)(
struct mca_btl_base_module_t* btl,
struct mca_btl_base_endpoint_t* endpoint,
struct mca_btl_base_descriptor_t* descriptor,
mca_btl_base_tag_t tag
);
/**
* Initiate an immediate blocking send.
* Completion Semantics: the BTL will make a best effort
* to send the header and "size" bytes from the datatype using the convertor.
* The header is guaranteed to be delivered entirely in the first segment.
* Should the BTL be unable to deliver the data due to resource constraints
* the BTL will return a descriptor (via the OUT param)
* of size "payload_size + header_size".
*
* @param btl (IN) BTL module
* @param endpoint (IN) BTL addressing information
* @param convertor (IN) Data type convertor
* @param header (IN) Pointer to header.
* @param header_size (IN) Size of header.
* @param payload_size (IN) Size of payload (from convertor).
* @param order (IN) The ordering tag (may be MCA_BTL_NO_ORDER)
* @param flags (IN) Flags.
* @param tag (IN) The tag value used to notify the peer.
* @param descriptor (OUT) The descriptor to be returned unable to be sent immediately
* @retval OPAL_SUCCESS The send was successfully queued
* @retval OPAL_ERROR The send failed
* @retval OPAL_ERR_UNREACH The endpoint is not reachable
* @retval OPAL_ERR_RESOURCE_BUSY The BTL is busy a descriptor will be returned
* (via the OUT param) if descriptors are available
*/
typedef int (*mca_btl_base_module_sendi_fn_t)(
struct mca_btl_base_module_t* btl,
struct mca_btl_base_endpoint_t* endpoint,
struct opal_convertor_t* convertor,
void* header,
size_t header_size,
size_t payload_size,
uint8_t order,
uint32_t flags,
mca_btl_base_tag_t tag,
mca_btl_base_descriptor_t** descriptor
);
/**
* Initiate an asynchronous put.
* Completion Semantics: the descriptor has been queued for a put operation
* the BTL now controls the descriptor until local
* completion callback is made on the descriptor
*
* BTLs that do not have the MCA_BTL_FLAGS_RDMA_MATCHED flag set
* allow multiple concurrent put operations on the same descriptor.
* BTLs that do have the MCA_BTL_FLAGS_RDMA_MATCHED flag set require
* a corresponding prepare_src/dst call for each put operation and
* therefore prohibit multiple concurrent put operations.
*
* @param btl (IN) BTL module
* @param endpoint (IN) BTL addressing information
* @param descriptor (IN) Description of the data to be transferred
*
* @retval OPAL_SUCCESS The descriptor was successfully queued for a put
* @retval OPAL_ERROR The descriptor was NOT successfully queued for a put
*/
typedef int (*mca_btl_base_module_put_fn_t)(
struct mca_btl_base_module_t* btl,
struct mca_btl_base_endpoint_t* endpoint,
struct mca_btl_base_descriptor_t* descriptor
);
/**
* Initiate an asynchronous get.
*
* Completion Semantics: the descriptor has been queued for a get operation
* the BTL now controls the descriptor until local
* completion callback is made on the descriptor
*
* BTLs that do not have the MCA_BTL_FLAGS_RDMA_MATCHED flag set
* allow multiple concurrent get operations on the same descriptor.
* BTLs that do have the MCA_BTL_FLAGS_RDMA_MATCHED flag set require
* a corresponding prepare_src/dst call for each get operation and
* therefore prohibit multiple concurrent get operations.
*
* @param btl (IN) BTL module
* @param endpoint (IN) BTL addressing information
* @param descriptor (IN) Description of the data to be transferred
*
* @retval OPAL_SUCCESS The descriptor was successfully queued for a get
* @retval OPAL_ERROR The descriptor was NOT successfully queued for a get
*
*/
typedef int (*mca_btl_base_module_get_fn_t)(
struct mca_btl_base_module_t* btl,
struct mca_btl_base_endpoint_t* endpoint,
struct mca_btl_base_descriptor_t* descriptor
);
/**
* Diagnostic dump of btl state.
*
* @param btl (IN) BTL module
* @param endpoint (IN) BTL endpoint
* @param verbose (IN) Verbosity level
*/
typedef void (*mca_btl_base_module_dump_fn_t)(
struct mca_btl_base_module_t* btl,
struct mca_btl_base_endpoint_t* endpoint,
int verbose
);
/**
* Fault Tolerance Event Notification Function
* @param state Checkpoint Status
* @return OPAL_SUCCESS or failure status
*/
typedef int (*mca_btl_base_module_ft_event_fn_t)(int state);
/**
* BTL module interface functions and attributes.
*/
struct mca_btl_base_module_t {
/* BTL common attributes */
mca_btl_base_component_t* btl_component; /**< pointer back to the BTL component structure */
size_t btl_eager_limit; /**< maximum size of first fragment -- eager send */
size_t btl_rndv_eager_limit; /**< the size of a data sent in a first fragment of rendezvous protocol */
size_t btl_max_send_size; /**< maximum send fragment size supported by the BTL */
size_t btl_rdma_pipeline_send_length; /**< amount of bytes that should be send by pipeline protocol */
size_t btl_rdma_pipeline_frag_size; /**< maximum rdma fragment size supported by the BTL */
size_t btl_min_rdma_pipeline_size; /**< minimum packet size for pipeline protocol */
uint32_t btl_exclusivity; /**< indicates this BTL should be used exclusively */
uint32_t btl_latency; /**< relative ranking of latency used to prioritize btls */
uint32_t btl_bandwidth; /**< bandwidth (Mbytes/sec) supported by each endpoint */
uint32_t btl_flags; /**< flags (put/get...) */
size_t btl_seg_size; /**< size of a btl segment */
/* BTL function table */
mca_btl_base_module_add_procs_fn_t btl_add_procs;
mca_btl_base_module_del_procs_fn_t btl_del_procs;
mca_btl_base_module_register_fn_t btl_register;
mca_btl_base_module_finalize_fn_t btl_finalize;
mca_btl_base_module_alloc_fn_t btl_alloc;
mca_btl_base_module_free_fn_t btl_free;
mca_btl_base_module_prepare_fn_t btl_prepare_src;
mca_btl_base_module_prepare_fn_t btl_prepare_dst;
mca_btl_base_module_send_fn_t btl_send;
mca_btl_base_module_sendi_fn_t btl_sendi;
mca_btl_base_module_put_fn_t btl_put;
mca_btl_base_module_get_fn_t btl_get;
mca_btl_base_module_dump_fn_t btl_dump;
/** the mpool associated with this btl (optional) */
mca_mpool_base_module_t* btl_mpool;
/** register a default error handler */
mca_btl_base_module_register_error_fn_t btl_register_error;
/** fault tolerant even notification */
mca_btl_base_module_ft_event_fn_t btl_ft_event;
#if OPAL_CUDA_GDR_SUPPORT
size_t btl_cuda_eager_limit; /**< switch from eager to RDMA */
size_t btl_cuda_rdma_limit; /**< switch from RDMA to rndv pipeline */
#endif /* OPAL_CUDA_GDR_SUPPORT */
};
typedef struct mca_btl_base_module_t mca_btl_base_module_t;
/*
* Macro for use in modules that are of type btl v3.0.0
* NOTE: This is not the final version of 3.0.0. Consider it
* alpha until this comment is removed.
*/
#define MCA_BTL_BASE_VERSION_3_0_0 \
MCA_BASE_VERSION_2_0_0, \
.mca_type_name = "btl", \
.mca_type_major_version = 3, \
.mca_type_minor_version = 0, \
.mca_type_release_version = 0
#define MCA_BTL_DEFAULT_VERSION(name) \
MCA_BTL_BASE_VERSION_3_0_0, \
.mca_component_name = name, \
.mca_component_major_version = OPAL_MAJOR_VERSION, \
.mca_component_minor_version = OPAL_MINOR_VERSION, \
.mca_component_release_version = OPAL_RELEASE_VERSION \
END_C_DECLS
#endif /* OPAL_MCA_BTL_H */
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