L4 will provide the callback to be called by L3 after the packet is
handled to lower layers for transmission. L4 will know that it can queue
more data from user at this point. The patch also change send function
that can no longer block to return void instead of future<>.
Currently dhcp assumes that cpu 0 gets all the packets and redistributes
them by itself. With multiqueue this is not necessary the case, so the
current trick to disable forwarding by installing special dhcp forward()
function will not work. Rework it by installing packet filter on all
cpus before running dhcp and forward all dhcp packets to cpu 0.
Some packets, like arp replies, are broadcast to all cpus for handling,
but only packet structure is copied for each cpu, the actual packet data
is the same for all of them. Currently networking stack mangles a
packet data during its travel up the stack while doing ntoh()
translations which cannot obviously work for broadcaster packets. This
patches fixes the code to not modify packet data while doing ntoh(), but
do it in a stack allocated copy of a data instead.
Simple discovery class + usage of it in the native stack init.
DHCP discovery will be default if no other ip options are set on command
line, and not explicitly turned off.
Signed-off-by: Calle Wilund <calle@cloudius-systems.com>
