netdev - Fwd: Problem with the kernel 4.15

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Date:   Fri, 6 Apr 2018 14:56:36 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     David Miller <davem@...emloft.net>
Cc:     netdev@...r.kernel.org
Subject: Fwd: Problem with the kernel 4.15 - cutting the band (tc)

Forwarding a report about what looks like a regression between 4.14 and 4.15.

New ENOSPC issue? I don't even knew where to start guessing where to look.

Help me, Davem-Wan Kenobi, you are my only hope.

(But adding netdev just in case somebody else goes "That's obviously Xyz")

              Linus

---------- Forwarded message ----------
From: Marcin Kabiesz <admin@...tcenter.eu>
Date: Thu, Apr 5, 2018 at 10:38 AM
Subject: Problem with the kernel 4.15 - cutting the band (tc)


Hello,
I have a problem with bandwidth cutting on kernel 4.15. On the version
up to 4.15, i.e. 4.14, this problem does not occur.

uname -a: Linux router 4.14.15 #1 SMP x86_64 Intel Xeon E3-1230 v6
command to reproduce:

tc qdisc add dev ifb0 root handle 1: htb r2q 2
tc class add dev ifb0 parent 1: classid 1:1 htb rate 10gbit ceil
10gbit quantum 16000
tc filter add dev ifb0 parent 1: prio 5 handle 1: protocol all u32 divisor 256
tc filter add dev ifb0 protocol all parent 1: prio 5 u32 ht 800::
match ip dst 0.0.0.0/0 hashkey mask 0x000000ff at 16 link 1:
tc filter add dev ifb0 parent 1:0 handle ::1 protocol all prio 5 u32
ht 1:2c: match ip dst 192.168.3.44/32 flowid 1:2
tc filter del dev ifb0 parent 1:0 handle 1:2c:1 prio 5 u32
tc filter add dev ifb0 parent 1:0 handle ::1 protocol all prio 5 u32
ht 1:2c: match ip dst 192.168.3.44/32 flowid 1:2
tc filter del dev ifb0 parent 1:0 handle 1:2c:1 prio 5 u32

This ok, no error/warnings and dmesg log.

uname -a: Linux router 4.15.8 #1 SMP x86_64 Intel Xeon E3-1230 v6 (or
4.15.14 this same effect)
command to reproduce:

tc qdisc add dev ifb0 root handle 1: htb r2q 2
tc class add dev ifb0 parent 1: classid 1:1 htb rate 10gbit ceil
10gbit quantum 16000
tc filter add dev ifb0 parent 1: prio 5 handle 1: protocol all u32 divisor 256
tc filter add dev ifb0 protocol all parent 1: prio 5 u32 ht 800::
match ip dst 0.0.0.0/0 hashkey mask 0x000000ff at 16 link 1:
tc filter add dev ifb0 parent 1:0 handle ::1 protocol all prio 5 u32
ht 1:2c: match ip dst 192.168.3.44/32 flowid 1:2
tc filter del dev ifb0 parent 1:0 handle 1:2c:1 prio 5 u32
tc filter add dev ifb0 parent 1:0 handle ::1 protocol all prio 5 u32
ht 1:2c: match ip dst 192.168.3.44/32 flowid 1:2
RTNETLINK answers: No space left on device
We have an error talking to the kernel

This not ok, on error/warnings and no dmesg log.

Best Regards
Please forgive my English
Marcin Kabiesz