On 21/08/16 00:25, Bruce Simpson wrote:
[Use a predicted branch in favour of Ethernet to optimize common case
comments snipped]
...we ensure that M_BCAST is cleared at all times before possible
re-entry, and use a separate M_BCASTL3 bit. Let the ethernet protocols
decide themselves if re-entered about M_BCAST based on DMAC.
Better still, rename it to M_IPBCAST, because that is exactly what that
flag would be. Treat it like M_PROMISC, hands off, use THAT test instead
of M_BCAST in the code (but predictive branch the original
in_broadcast() call), make sure M_BCAST is cleared before possible
Netgraph handoff, but leave M_IPBCAST set.
That way, anyone can tell IP set the M_BCAST bit - not Ethernet - just
by XORing them together.
I'd code this, but I don't have a -CURRENT box. :-(
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