Re: [patch net-next 14/17] mlxsw: spectrum_router: Add support for IPv6 routes addition / deletion

On Wed, Jul 19, 2017 at 10:36:52AM -0600, David Ahern wrote:

quoted

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2. How are routes with devices unrelated to ports owned by this driver
handled?

They are handled just like any other route, but they don't have a valid
RIF (for directly connected routes) or an adjacency group (for
gatewayed routes), so the check in mlxsw_sp_fib_entry_should_offload()
will return false and they will be programmed to the device with trap
action, but using a trap ID (RTR_INGRESS0) with a lower traffic class
than IP2ME, so packets that actually need to be locally received by the
CPU have a better QoS.

so mlxsw keeps a copy of the complete FIB for IPv4 and IPv6, even routes
unrelated to its ports?

If we don't reflect all the routes in the system to the ASIC, then we'll
have a broken routing table and a different behavior from what you would
get with plain NICs.