David Miller wrote:
I've been meaning to bring this up.
A lot of cards that support multiple MAC addresses
in hardware provide pre-cooked lists of alternate
MAC addresses. This is either done via EEPROM,
NVRAM, or OpenFirmware device properties.
For example, the Sun Neptune cards can provide an
array of up to 16 alternate MAC addresses per-port.
We should provide a way to export these lists to
userspace.
Perhaps an ethtool thing, Jeff?
Once we have this, virtualization implementations can probe for and
use them. Currently they have no way to discover these things so
probably they just generate their own using some algorithm.
hmmmm. Using ethtool isn't a big deal, but IMO you probably want more
than just an exported list for the usage you described... it sounds
like some sort of reservation system should be used, to note which MAC
addresses are [not] in use?
Then a virt client -- or anyone who wants multiple unicast addresses for
whatever reason -- can let other clients to avoid MAC addresses 1, 7, or
13 (random examples).
Jeff
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