RDMA: Convert drivers to use sgid_attr instead of sgid_index
The core code now ensures that all driver callbacks that receive an rdma_ah_attrs will have a sgid_attr's pointer if there is a GRH present. Drivers can use this pointer instead of calling a query function with sgid_index. This simplifies the drivers and also avoids races where a gid_index lookup may return different data if it is changed. Signed-off-by: NParav Pandit <parav@mellanox.com> Signed-off-by: NJason Gunthorpe <jgg@mellanox.com> Signed-off-by: NLeon Romanovsky <leonro@mellanox.com>
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