netdev - Re: [PATCH bpf-next] bpftool: Add BPF_F_QUERY_EFFECTIVE support in bpftool cgroup [show|tree]

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Date:   Mon, 24 Jun 2019 16:22:25 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Takshak Chahande <ctakshak@...com>, netdev@...r.kernel.org
Cc:     ast@...nel.org, rdna@...com, kernel-team@...com
Subject: Re: [PATCH bpf-next] bpftool: Add BPF_F_QUERY_EFFECTIVE support in
 bpftool cgroup [show|tree]

On 06/22/2019 12:33 AM, Takshak Chahande wrote:
> With different bpf attach_flags available to attach bpf programs specially
> with BPF_F_ALLOW_OVERRIDE and BPF_F_ALLOW_MULTI, the list of effective
> bpf-programs available to any sub-cgroups really needs to be available for
> easy debugging.
> 
> Using BPF_F_QUERY_EFFECTIVE flag, one can get the list of not only attached
> bpf-programs to a cgroup but also the inherited ones from parent cgroup.
> 
> So "-e" option is introduced to use BPF_F_QUERY_EFFECTIVE query flag here to
> list all the effective bpf-programs available for execution at a specified
> cgroup.
> 
> Reused modified test program test_cgroup_attach from tools/testing/selftests/bpf:
>   # ./test_cgroup_attach
> 
> With old bpftool (without -e option):
> 
>   # bpftool cgroup show /sys/fs/cgroup/cgroup-test-work-dir/cg1/
>   ID       AttachType      AttachFlags     Name
>   271      egress          multi           pkt_cntr_1
>   272      egress          multi           pkt_cntr_2
> 
>   Attached new program pkt_cntr_4 in cg2 gives following:
> 
>   # bpftool cgroup show /sys/fs/cgroup/cgroup-test-work-dir/cg1/cg2
>   ID       AttachType      AttachFlags     Name
>   273      egress          override        pkt_cntr_4
> 
> And with new "-e" option it shows all effective programs for cg2:
> 
>   # bpftool -e cgroup show /sys/fs/cgroup/cgroup-test-work-dir/cg1/cg2
>   ID       AttachType      AttachFlags     Name
>   273      egress          override        pkt_cntr_4
>   271      egress          override        pkt_cntr_1
>   272      egress          override        pkt_cntr_2
> 
> Signed-off-by: Takshak Chahande <ctakshak@...com>
> Acked-by: Andrey Ignatov <rdna@...com>

Applied, thanks!