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For userspace RoCE UD QPs we need to know the GID format that the kernel uses, e.g when working over older kernels. For that end, add a new port capability IB_PORT_IP_BASED_GIDS and report it when query port is issued. Signed-off-by: Moni Shoua <[email protected]> Signed-off-by: Matan Barak <[email protected]> Signed-off-by: Or Gerlitz <[email protected]> Signed-off-by: Roland Dreier <[email protected]>