c8f6a362bf
Extend rdma_cm to support multicast communication. Multicast support is added to the existing RDMA_PS_UDP port space, as well as a new RDMA_PS_IPOIB port space. The latter port space allows joining the multicast groups used by IPoIB, which enables offloading IPoIB traffic to a separate QP. The port space determines the signature used in the MGID when joining the group. The newly added RDMA_PS_IPOIB also allows for unicast operations, similar to RDMA_PS_UDP. Supporting the RDMA_PS_IPOIB requires changing how UD QPs are initialized, since we can no longer assume that the qkey is constant. This requires saving the Q_Key to use when attaching to a device, so that it is available when creating the QP. The Q_Key information is exported to the user through the existing rdma_init_qp_attr() interface. Multicast support is also exported to userspace through the rdma_ucm. Signed-off-by: Roland Dreier <rolandd@cisco.com>
51 lines
1.7 KiB
C
51 lines
1.7 KiB
C
/*
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* Copyright (c) 2006 Intel Corporation. All rights reserved.
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*
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* This Software is licensed under one of the following licenses:
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*
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* 1) under the terms of the "Common Public License 1.0" a copy of which is
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* available from the Open Source Initiative, see
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* http://www.opensource.org/licenses/cpl.php.
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*
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* 2) under the terms of the "The BSD License" a copy of which is
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* available from the Open Source Initiative, see
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* http://www.opensource.org/licenses/bsd-license.php.
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*
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* 3) under the terms of the "GNU General Public License (GPL) Version 2" a
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* copy of which is available from the Open Source Initiative, see
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* http://www.opensource.org/licenses/gpl-license.php.
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*
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* Licensee has the right to choose one of the above licenses.
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*
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* Redistributions of source code must retain the above copyright
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* notice and one of the license notices.
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*
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* Redistributions in binary form must reproduce both the above copyright
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* notice, one of the license notices in the documentation
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* and/or other materials provided with the distribution.
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*
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*/
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#if !defined(RDMA_CM_IB_H)
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#define RDMA_CM_IB_H
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#include <rdma/rdma_cm.h>
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/**
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* rdma_set_ib_paths - Manually sets the path records used to establish a
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* connection.
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* @id: Connection identifier associated with the request.
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* @path_rec: Reference to the path record
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*
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* This call permits a user to specify routing information for rdma_cm_id's
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* bound to Infiniband devices. It is called on the client side of a
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* connection and replaces the call to rdma_resolve_route.
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*/
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int rdma_set_ib_paths(struct rdma_cm_id *id,
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struct ib_sa_path_rec *path_rec, int num_paths);
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/* Global qkey for UDP QPs and multicast groups. */
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#define RDMA_UDP_QKEY 0x01234567
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#endif /* RDMA_CM_IB_H */
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