Roland, where exactly does the following math come from?
static inline struct ipoib_neigh **to_ipoib_neigh(struct neighbour *neigh)
{
return (struct ipoib_neigh **) (neigh->ha + 24 -
(offsetof(struct neighbour, ha) & 4));
}
1. What does & 4 do here?
2. Why are we subsrctucting a function of ha offset?
4. What is 24? Is it related to INFINIBAND_ALEN?
Thanks,
--
MST
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