Add support for multicast in RoCEv2

This series from Noa enables multicast traffic over RoCE v2.

To allow this, several changes were required.

First of all, there is a need to validate MLID when link layer is Infiniband. This check is mandatory according to Infiniband spec but the MLID should be ignored for RoCE according to RoCEv2 Annex (Annex 17, A17.5.6).

Second, there is need to cange the mapping of IPv4 multicast addresses to MGIDs to be according to RoCEv2 Annex (A17.4.1.1 L3 Addresses): GID = ::ffff:<IPv4 Address>

And third, multicast addresses need to be mapped to multicast MAC instead of searching for it in the GID table.

Thanks

Noa Osherovich (3):
IB/core: Fix the validations of a multicast LID in attach or detach
operations
IB/core: Set RoCEv2 MGID according to spec
IB/core: Add support for RoCEv2 multicast

 drivers/infiniband/core/cma.c   | 13 +++++----
 drivers/infiniband/core/verbs.c | 62 +++++++++++++++++++++++++++++++++++++----
 include/rdma/ib_addr.h          |  8 +++++-
 3 files changed, 70 insertions(+), 13 deletions(-)

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2.12.2

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