CAKE w/ DSCPs - cake-qos-simple

[tohojo]

@Lynx

I have implemented the following:

# create egress handle using prio qdisc
tc qdisc add dev "${ul_if}" handle 1: root prio
# filter the flow using pedit and send the filtered flow to band 1:1
tc filter add dev "${ul_if}" parent 1: protocol ip matchall action pedit ex munge ip dsfield set "${overwrite_ecn_val_ul}" retain 0x3 flowid 1:1
# then apply cake on band 1:1
tc qdisc add dev "${ul_if}" parent 1:1 cake bandwidth "${cake_ul_rate_Mbps}Mbit" ${cake_ul_options}

I tested this on upload and it works - ECN bits are overwritten before cake sees them and cake does not mark any packets on upload. I cannot test download because my ISP bleaches the ECN bits.

Any thoughts?

Why the extra prio qdisc? You should be able to attach the filter directly to cake, like:

# create egress handle using prio qdisc
tc qdisc add dev "${ul_if}" handle 1: cake bandwidth "${cake_ul_rate_Mbps}Mbit" ${cake_ul_options}
tc filter add dev "${ul_if}" parent 1: protocol ip matchall action pedit ex munge ip dsfield set "${overwrite_ecn_val_ul}" retain 0x3