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openmpi/ompi/mca/btl/btl.h
George Bosilca e361bcb64c Send optimizations. 
1. The send path get shorter. The BTL is allowed to return > 0 to specify that the
   descriptor was pushed to the networks, and that the memory attached to it is 
   available again for the upper layer. The MCA_BTL_DES_SEND_ALWAYS_CALLBACK flag
   can be used by the PML to force the BTL to always trigger the callback.
   Unmodified BTL will continue to work as expected, as they will return OMPI_SUCCESS
   which force the PML to have exactly the same behavior as before. Some BTLs have
   been modified: self, sm, tcp, mx.
2. Add send immediate interface to BTL.
   The idea is to have a mechanism of allowing the BTL to take advantage of
   send optimizations such as the ability to deliver data "inline". Some
   network APIs such as Portals allow data to be sent using a "thin" event
   without packing data into a memory descriptor. This interface change
   allows the BTL to use such capabilities and allows for other optimizations
   in the future. All existing BTLs except for Portals and sm have this interface
   set to NULL.

This commit was SVN r18551.
2008-05-30 03:58:39 +00:00

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/*
* 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) 2006-2007 Los Alamos National Security, LLC. 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_param_register_int(),
* mca_base_param_register_string()). 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
* ompi_modex_send() interface. Note that peer information is not
* guaranteed to be available via ompi_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.
*
*/
#include "opal/mca/mca.h"
#ifndef MCA_BTL_H
#define MCA_BTL_H
#include "ompi/types.h"
#include "opal/prefetch.h" /* For OPAL_LIKELY */
#include "ompi/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 ompi_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)
/* 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
/* 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
/**
* 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.
*/
struct mca_btl_base_segment_t {
/** Address of the memory */
ompi_ptr_t seg_addr;
/** Length in bytes */
uint32_t seg_len;
#if OMPI_ENABLE_HETEROGENEOUS_SUPPORT
/** Heterogeneous padding */
uint8_t seg_padding[4];
#endif
/** Memory segment key required by some RDMA networks */
union {
uint32_t key32[2];
uint64_t key64;
uint8_t key8[8];
} seg_key;
};
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: from the initiator of a PUT operation des_src is the local memory
* and des_dst is the remote memory
* from the initiator of a GET operations des_dst is the local memory
* and des_src is the remote memory
* from the initiator of a SEND operation des_src is the local memory
* and des_dst is not used
*/
struct mca_btl_base_descriptor_t {
ompi_free_list_item_t super;
mca_btl_base_segment_t *des_src; /**< source segments */
size_t des_src_cnt; /**< number of source segments */
mca_btl_base_segment_t *des_dst; /**< destination segments */
size_t des_dst_cnt; /**< 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;
OMPI_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
/**
* Maximum number of allowed segments in src/dst fields of a descriptor.
*/
#define MCA_BTL_DES_MAX_SEGMENTS 16
/*
* 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 ompi_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.
*
* @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;
OMPI_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_1_0_1_t {
mca_base_component_t btl_version;
mca_base_component_data_1_0_0_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_1_0_1_t mca_btl_base_component_1_0_1_t;
typedef struct mca_btl_base_component_1_0_1_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_1_0_1_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 OMPI_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 OMPI_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 ompi_modex_send()
* function should be available during this call via the corresponding
* ompi_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 ompi_proc_t** procs,
struct mca_btl_base_endpoint_t** endpoints,
struct ompi_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 ompi_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 OMPI_SUCCESS The callback was registered successfully
* @return OMPI_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
*/
typedef void (*mca_btl_base_module_error_cb_fn_t)(
struct mca_btl_base_module_t* btl,
int32_t flags
);
/**
* Register a callback function that is called on receipt
* of an error.
*
* @param[IN] btl BTL module
* @param[IN] cbfunc The callback function
*
* @return OMPI_SUCCESS The callback was registered successfully
* @return OMPI_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 ompi_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 OMPI_SUCCESS The descriptor was successfully queued for a send
* @retval OMPI_ERROR The descriptor was NOT successfully queued for a send
* @retval OMPI_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 tag (IN) The tag value used to notify the peer.
* @param descriptor (OUT) The descriptor to be returned unable to be sent immediately
* @retval OMPI_SUCCESS The send was successfully queued
* @retval OMPI_ERROR The send failed
* @retval OMPI_ERR_UNREACH The endpoint is not reachable
* @retval OMPI_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 ompi_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 OMPI_SUCCESS The descriptor was successfully queued for a put
* @retval OMPI_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 OMPI_SUCCESS The descriptor was successfully queued for a get
* @retval OMPI_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 OMPI_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...) */
/* 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;
};
typedef struct mca_btl_base_module_t mca_btl_base_module_t;
/*
* Macro for use in modules that are of type btl v1.0.1
*/
#define MCA_BTL_BASE_VERSION_1_0_1 \
/* coll v1.0 is chained to MCA v1.0 */ \
MCA_BASE_VERSION_1_0_0, \
/* btl v1.0 */ \
"btl", 1, 0, 1
/*
* Macro for use in modules that are of type btl v1.0.0
* alows older btl sources to compile..
*/
#define MCA_BTL_BASE_VERSION_1_0_0 \
/* coll v1.0 is chained to MCA v1.0 */ \
MCA_BASE_VERSION_1_0_0, \
/* btl v1.0 */ \
"btl", 1, 0, 0
END_C_DECLS
#endif /* OMPI_MCA_BTL_H */
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