linux-kernel - Re: test ./tools/testing/selftests/bpf/test

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Date:   Wed, 7 Sep 2022 09:43:59 +0300
From:   Ido Schimmel <idosch@...sch.org>
To:     Jie2x Zhou <jie2x.zhou@...el.com>
Cc:     andrii@...nel.org, mykolal@...com, ast@...nel.org,
        daniel@...earbox.net, martin.lau@...ux.dev, davem@...emloft.net,
        kuba@...nel.org, hawk@...nel.org, netdev@...r.kernel.org,
        bpf@...r.kernel.org, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org, Philip Li <philip.li@...el.com>,
        petrm@...dia.com
Subject: Re: test ./tools/testing/selftests/bpf/test_offload.py failed

On Wed, Sep 07, 2022 at 01:16:57PM +0800, Jie2x Zhou wrote:
> I found that "disable_ifindex" file do not set read function, so return -EINVAL when do read.
> Is it a bug in test_offload.py?

Most likely a bug in netdevsim itself as it sets the mode of this file
as "rw" instead of "w". The test actually knows to skip such files:

            p = os.path.join(path, f)
            if not os.stat(p).st_mode & stat.S_IRUSR:
                continue

Can you test the following patch?

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,

> 
> test output:
>  selftests: bpf: test_offload.py
>  Test destruction of generic XDP...
> ......
>      raise Exception("Command failed: %s\n%s" % (proc.args, stderr))
>  Exception: Command failed: cat /sys/kernel/debug/netdevsim/netdevsim0//ports/0/dev/hwstats/l3/disable_ifindex
>  
>  cat: /sys/kernel/debug/netdevsim/netdevsim0//ports/0/dev/hwstats/l3/disable_ifindex: Invalid argument
>  not ok 20 selftests: bpf: test_offload.py # exit=1