Hi,
I have hit some weird (probably missing some detail) issue with drr.
Originally it was tested between two machines, then I quickly double
checked between namespaces (same behaviour) - the configuration follows:
# setup namespace
ip netns add drrtest
ip li add name left type veth peer name right
ip li set right netns drrtest
# setup 'left' interface with drr
tc qdisc add dev left handle 1:0 root drr
for x in {1..16}; do tc class add dev left classid 1:$x parent 1:0 drr; done
for x in {1..16}; do tc qdisc add dev left handle $((256+x)):0 parent 1:$x
pfifo_fast; done
tc filter add dev left proto all pref 1 parent 1:0 handle 1 flow map key dst
divisor 16 baseclass 1:1
ip add add 10.15.0.255/16 dev left
ip li set left up
The above creates simple drr setup with 16 classes, counted from 1:1 to 1:16
The flow filter should simply distribute it across those classes,
relevant piece of code would suggest everything is ok:
if (f->divisor)
classid %= f->divisor;
res->class = 0;
res->classid = TC_H_MAKE(f->baseclass, f->baseclass + classid);
So 'classid' should 0-15 and after TC_H_MAKE() 1:1-1:16
# setup 'right' interface
ip netns exec drrtest bash
ip add add 10.15.1.249/16 dev right
ip li set right up
But with this setup, any transfer from 'left' to 'right' is blackholed.
If I change ip address of 'right' to 10.15.1.248/16, everything works
again - which would suggest some issue with proper classification.
At this point I'm a bit lost what I'm doing wrong.
