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tc-policy: Update README with info on inspecting loaded BPF-progs

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Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
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Jesper Dangaard Brouer
2022-02-01 15:30:17 +01:00
parent 71d1479d1d
commit 91432fe471
1 changed files with 29 additions and 0 deletions
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@ -87,3 +87,32 @@ Or as oneliner:
#+begin_src sh
bpftrace -e 't:net:net_dev_start_xmit {@txq[str(args->name, 15)]=lhist(args->queue_mapping, 0,32,1)}'
#+end_src
* Inspecting loaded BPF
How do you see if these BPF TC-hook programs are loaded?
** bpftool
The cmdline =bpftool net= can list any network related BPF program:
#+begin_example
root@main-ctrl2:~ # bpftool net
xdp:
eth1(5) driver id 59
tc:
eth1(5) clsact/egress not_txq_zero:[17] id 17
#+end_example
There we see both the *XDP* BPF-program used by AF_XDP to redirect frames, and
the *TC* hook BPF-prog loaded and attached.
** tc egress
The tc command need to be longer and more explicit:
#+begin_example
root@main-ctrl2:~ # tc filter show dev eth1 egress
filter protocol all pref 49199 bpf chain 0
filter protocol all pref 49199 bpf chain 0 handle 0x1 not_txq_zero:[17] direct-action not_in_hw id 17 tag a761e11074b78959 jited
#+end_example