552c9ca5a0
WHAT: Open our low-level communication infrastructure by moving all necessary components (btl/rcache/allocator/mpool) down in OPAL All the components required for inter-process communications are currently deeply integrated in the OMPI layer. Several groups/institutions have express interest in having a more generic communication infrastructure, without all the OMPI layer dependencies. This communication layer should be made available at a different software level, available to all layers in the Open MPI software stack. As an example, our ORTE layer could replace the current OOB and instead use the BTL directly, gaining access to more reactive network interfaces than TCP. Similarly, external software libraries could take advantage of our highly optimized AM (active message) communication layer for their own purpose. UTK with support from Sandia, developped a version of Open MPI where the entire communication infrastucture has been moved down to OPAL (btl/rcache/allocator/mpool). Most of the moved components have been updated to match the new schema, with few exceptions (mainly BTLs where I have no way of compiling/testing them). Thus, the completion of this RFC is tied to being able to completing this move for all BTLs. For this we need help from the rest of the Open MPI community, especially those supporting some of the BTLs. A non-exhaustive list of BTLs that qualify here is: mx, portals4, scif, udapl, ugni, usnic. This commit was SVN r32317.
39 строки
1.3 KiB
C
39 строки
1.3 KiB
C
/*
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* Copyright (c) 2014 Cisco Systems, Inc. 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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#ifndef LIBNL_UTILS_H
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#define LIBNL_UTILS_H
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/* This header file and btl_usnic_libnl1_utils.c/btl_usnic_libnl3_utils.c are
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* here to support OS routing lookups. They use the Linux "routing netlink"
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* communication subsystem (see "man 7 rtnetlink") via the "libnl" helper
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* library. Unfortunately, libnl comes in two major versions: libnl (v1) and
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* libnl-3 with significant API differences between them.
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*
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* Quick glossary to some of the abbreviations here:
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* rtnl -- rtnetlink (routing netlink)
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* sk -- socket
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*/
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struct usnic_rtnl_sk;
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/* returns zero on success or negative errno values on failure */
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int opal_btl_usnic_rtnl_sk_alloc(struct usnic_rtnl_sk **p_sk);
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void opal_btl_usnic_rtnl_sk_free(struct usnic_rtnl_sk* u_nlsk);
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/* src_addr and dst_addr are IPv4 addresses in network byte order. Returns
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* zero on successful route lookup, -1 otherwise. */
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int opal_btl_usnic_nl_ip_rt_lookup(struct usnic_rtnl_sk *unlsk,
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const char *src_ifname,
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uint32_t src_addr,
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uint32_t dst_addr, int *metric);
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#endif /* LIBNL_UTILS_H */
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