I forget to explain how to check that the tc command was accepted:
root@ubuntu1804hwe:~# tc filter show dev dummy1 egress
filter protocol all pref 49152 matchall chain 0
filter protocol all pref 49152 matchall chain 0 handle 0x1
not_in_hw
action order 1: bpf test.o:[test] id 9 tag 26af4b090d2d67ee jited
default-action pipe
index 1 ref 1 bind 1
root@ubuntu1804hwe:~#
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https://bugs.launchpad.net/bugs/1896504
Title:
tc/ebpf: unable to use BPF_FUNC_skb_change_head
Status in linux package in Ubuntu:
Incomplete
Bug description:
[Impact]
tc ebpf program that uses BPF_FUNC_skb_change_head are rejected.
This helper exists since linux v4.10, but it cannot be used until the the
upstream commit 6f3f65d80dac ("net: bpf: Allow TC programs to call
BPF_FUNC_skb_change_head"):
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=6f3f65d80dac
[Test Case]
Create a, ebpf program that uses this helper and load it with tc.
[Regression Potential]
The patch is trivial, the potential regressions are low.
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