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,
