IPoIB multicast support with Mellanox ConnectX-3 Pro cards using RoCEv2

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Issue

A simple multicast connectivity test using the mckey program does not work when using Mellanox ConnectX-3 Pro cards (mlx4) which are in RoCEv2 mode.

Environment

Red Hat Enterprise Linux
Mellanox ConnectX-3 Pro hardware (mlx4 module)

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