From c8f6a362bf3eb28ade6027b49bb160a336dd51c0 Mon Sep 17 00:00:00 2001 From: Sean Hefty Date: Thu, 15 Feb 2007 17:00:18 -0800 Subject: RDMA/cma: Add multicast communication support 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 --- include/rdma/rdma_cm_ib.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'include/rdma/rdma_cm_ib.h') diff --git a/include/rdma/rdma_cm_ib.h b/include/rdma/rdma_cm_ib.h index 9b176df1d667..950424b38f16 100644 --- a/include/rdma/rdma_cm_ib.h +++ b/include/rdma/rdma_cm_ib.h @@ -44,7 +44,7 @@ int rdma_set_ib_paths(struct rdma_cm_id *id, struct ib_sa_path_rec *path_rec, int num_paths); -/* Global qkey for UD QPs and multicast groups. */ -#define RDMA_UD_QKEY 0x01234567 +/* Global qkey for UDP QPs and multicast groups. */ +#define RDMA_UDP_QKEY 0x01234567 #endif /* RDMA_CM_IB_H */ -- cgit v1.2.3-59-g8ed1b