Create inbound with Cake

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Create inbound with Cake

Juan Simón

1/16/24, 8:50 PM

I have created the following NetworkManager dispatcher files on my system, following the instructions I read here: https://www.bufferbloat.net/projects/codel/wiki/CakeRecipes :

$ cat /etc/NetworkManager/dispatcher.d/30-ethtool
#!/bin/bash

if [ "$1" == "enp68s0" ] && [ "$2" == "up" ]; then
    ethtool -K "$1" tso off gro off gso off
fi

$ cat /etc/NetworkManager/dispatcher.d/pre-up.d/40-qdisc-cake
#!/bin/bash

if [ "$1" == "enp68s0" ]; then
    tc qdisc replace dev "$1" root cake ethernet bandwidth 1gbit
fi

cat /etc/NetworkManager/dispatcher.d/45-qdisc-cake-inbound
#!/bin/bash

if [ "$1" == "enp68s0" ] && [ "$2" == "up" ]; then
    ifb="ifb4$1"
    ip link add name "$ifb" type ifb
    tc qdisc del dev "$1" ingress
    tc qdisc add dev "$1" handle ffff: ingress
    tc qdisc del dev "$ifb" root
    tc qdisc add dev "$ifb" root cake bandwidth 1gbit besteffort
    ip link set "$ifb" up
    tc filter add dev "$1" parent ffff: matchall action mirred egress redirect dev "$ifb"
fi

And this is the status of my network devices once the system is booted (I have disabled IPv6 on enp68s0):

$ tc -s qdisc show dev enp68s0
qdisc cake 8001: root refcnt 9 bandwidth 1Gbit diffserv3 triple-isolate nonat nowash no-ack-filter split-gso rtt 100ms noatm overhead 38 mpu 84
 Sent 349141491 bytes 355525 pkt (dropped 0, overlimits 412519 requeues 1275)
 backlog 0b 0p requeues 1275
 memory used: 205056b of 15140Kb
 capacity estimate: 1Gbit
 min/max network layer size:           28 /    1500
 min/max overhead-adjusted size:       84 /    1538
 average network hdr offset:           14

                   Bulk  Best Effort        Voice
  thresh      62500Kbit        1Gbit      250Mbit
  target            5ms          5ms          5ms
  interval        100ms        100ms        100ms
  pk_delay         13us         17us          3us
  av_delay          5us          2us          1us
  sp_delay          0us          0us          0us
  backlog            0b           0b           0b
  pkts           305582        49404          539
  bytes       342836359      6282092        23040
  way_inds          876         2189            0
  way_miss         4837         8131            9
  way_cols            0            0            0
  drops               0            0            0
  marks               0            0            0
  ack_drop            0            0            0
  sp_flows            7            6            1
  bk_flows            0            0            0
  un_flows            0            0            0
  max_len          3012         3487          112
  quantum          1514         1514         1514

qdisc ingress ffff: parent ffff:fff1 ----------------
 Sent 35716092 bytes 195928 pkt (dropped 0, overlimits 0 requeues 0)
 backlog 0b 0p requeues 0

$ ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: enp68s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc cake state UP group default qlen 1000
    link/ether d4:5d:64:55:a0:4c brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.3/24 brd 192.168.1.255 scope global dynamic noprefixroute enp68s0
       valid_lft 85806sec preferred_lft 85806sec
3: ifb0: <BROADCAST,NOARP> mtu 1500 qdisc noop state DOWN group default qlen 32
    link/ether 46:0f:08:5b:58:19 brd ff:ff:ff:ff:ff:ff
4: ifb1: <BROADCAST,NOARP> mtu 1500 qdisc noop state DOWN group default qlen 32
    link/ether 5a:6e:1b:6a:11:ea brd ff:ff:ff:ff:ff:ff
5: ifb4enp68s0: <BROADCAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc cake state UNKNOWN group default qlen 32
    link/ether ca:5b:3f:51:a9:a7 brd ff:ff:ff:ff:ff:ff
    inet6 fe80::c85b:3fff:fe51:a9a7/64 scope link
       valid_lft forever preferred_lft forever

My doubts are: is that ip output correct? is it "normal" that ifb0 and ifb1 are created and in the DOWN state? is it also "normal" that ifb4enp68s0 has the status UNKNOWN?

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