Re: test ./tools/testing/selftests/bpf/test_offload.py failed

[Zhou, Jie2X]

hi ido,

>> My error is  "Exception: Command failed: cat /sys/kernel/debug/netdevsim/netdevsim0//ports/0/dev/hwstats/l3/disable_ifindex"
>This one is solved by the netdevsim patch ([2]).
Thanks for your reply.
About netdevsim patch ([2]), do you commit it to kernel mail list?

best regards,

________________________________________
From: Ido Schimmel <idosch@xxxxxxxxxx>
Sent: Thursday, September 8, 2022 2:23 PM
To: Zhou, Jie2X
Cc: kuba@xxxxxxxxxx; andrii@xxxxxxxxxx; mykolal@xxxxxx; ast@xxxxxxxxxx; daniel@xxxxxxxxxxxxx; martin.lau@xxxxxxxxx; davem@xxxxxxxxxxxxx; hawk@xxxxxxxxxx; netdev@xxxxxxxxxxxxxxx; bpf@xxxxxxxxxxxxxxx; linux-kselftest@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; Li, Philip; petrm@xxxxxxxxxx
Subject: Re: test ./tools/testing/selftests/bpf/test_offload.py failed

On Thu, Sep 08, 2022 at 03:10:51AM +0000, Zhou, Jie2X wrote:
> My error is  "Exception: Command failed: cat /sys/kernel/debug/netdevsim/netdevsim0//ports/0/dev/hwstats/l3/disable_ifindex"

This one is solved by the netdevsim patch ([2]).

> Do you get [1]error, after patch [2]?

Yes. Maybe you do not see it because you have an older bpftool without
"libbpf_strict" feature:

$ bpftool --version
bpftool v6.8.0
using libbpf v0.8
features: libbfd, libbpf_strict, skeletons

> [1]
> # bpftool prog load /home/idosch/code/linux/tools/testing/selftests/bpf/sample_ret0.o /sys/fs/bpf/nooffload type xdp
> Error: object file doesn't contain any bpf program
> Warning: bpftool is now running in libbpf strict mode and has more stringent requirements about BPF programs.
> If it used to work for this object file but now doesn't, see --legacy option for more details.
>
> [2]
> diff --git a/drivers/net/netdevsim/hwstats.c b/drivers/net/netdevsim/hwstats.c
> index 605a38e16db0..0e58aa7f0374 100644
> --- a/drivers/net/netdevsim/hwstats.c
> +++ b/drivers/net/netdevsim/hwstats.c
> @@ -433,11 +433,11 @@ int nsim_dev_hwstats_init(struct nsim_dev *nsim_dev)
>                 goto err_remove_hwstats_recursive;
>         }
>
> -       debugfs_create_file("enable_ifindex", 0600, hwstats->l3_ddir, hwstats,
> +       debugfs_create_file("enable_ifindex", 0200, hwstats->l3_ddir, hwstats,
>                             &nsim_dev_hwstats_l3_enable_fops.fops);
> -       debugfs_create_file("disable_ifindex", 0600, hwstats->l3_ddir, hwstats,
> +       debugfs_create_file("disable_ifindex", 0200, hwstats->l3_ddir, hwstats,
>                             &nsim_dev_hwstats_l3_disable_fops.fops);
> -       debugfs_create_file("fail_next_enable", 0600, hwstats->l3_ddir, hwstats,
> +       debugfs_create_file("fail_next_enable", 0200, hwstats->l3_ddir, hwstats,
>                             &nsim_dev_hwstats_l3_fail_fops.fops);
>
>         INIT_DELAYED_WORK(&hwstats->traffic_dw,