* [PATCH net] selftest/bpf: no need to drop the packet when there is no geneve opt
@ 2021-02-24 8:14 Hangbin Liu
2021-02-24 19:17 ` William Tu
2021-02-24 20:40 ` patchwork-bot+netdevbpf
0 siblings, 2 replies; 3+ messages in thread
From: Hangbin Liu @ 2021-02-24 8:14 UTC (permalink / raw)
To: netdev
Cc: Jakub Kicinski, Daniel Borkmann, Yi-Hung Wei, David Miller, bpf,
Jiong Wang, Hangbin Liu
In bpf geneve tunnel test we set geneve option on tx side. On rx side we
only call bpf_skb_get_tunnel_opt(). Since commit 9c2e14b48119 ("ip_tunnels:
Set tunnel option flag when tunnel metadata is present") geneve_rx() will
not add TUNNEL_GENEVE_OPT flag if there is no geneve option, which cause
bpf_skb_get_tunnel_opt() return ENOENT and _geneve_get_tunnel() in
test_tunnel_kern.c drop the packet.
As it should be valid that bpf_skb_get_tunnel_opt() return error when
there is not tunnel option, there is no need to drop the packet and
break all geneve rx traffic. Just set opt_class to 0 in this test and
keep returning TC_ACT_OK.
Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
---
tools/testing/selftests/bpf/progs/test_tunnel_kern.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/tools/testing/selftests/bpf/progs/test_tunnel_kern.c b/tools/testing/selftests/bpf/progs/test_tunnel_kern.c
index a621b58ab079..9afe947cfae9 100644
--- a/tools/testing/selftests/bpf/progs/test_tunnel_kern.c
+++ b/tools/testing/selftests/bpf/progs/test_tunnel_kern.c
@@ -446,10 +446,8 @@ int _geneve_get_tunnel(struct __sk_buff *skb)
}
ret = bpf_skb_get_tunnel_opt(skb, &gopt, sizeof(gopt));
- if (ret < 0) {
- ERROR(ret);
- return TC_ACT_SHOT;
- }
+ if (ret < 0)
+ gopt.opt_class = 0;
bpf_trace_printk(fmt, sizeof(fmt),
key.tunnel_id, key.remote_ipv4, gopt.opt_class);
--
2.26.2
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH net] selftest/bpf: no need to drop the packet when there is no geneve opt
2021-02-24 8:14 [PATCH net] selftest/bpf: no need to drop the packet when there is no geneve opt Hangbin Liu
@ 2021-02-24 19:17 ` William Tu
2021-02-24 20:40 ` patchwork-bot+netdevbpf
1 sibling, 0 replies; 3+ messages in thread
From: William Tu @ 2021-02-24 19:17 UTC (permalink / raw)
To: Hangbin Liu
Cc: Linux Kernel Network Developers, Jakub Kicinski, Daniel Borkmann,
Yi-Hung Wei, David Miller, bpf, Jiong Wang
On Wed, Feb 24, 2021 at 12:37 AM Hangbin Liu <liuhangbin@gmail.com> wrote:
>
> In bpf geneve tunnel test we set geneve option on tx side. On rx side we
> only call bpf_skb_get_tunnel_opt(). Since commit 9c2e14b48119 ("ip_tunnels:
> Set tunnel option flag when tunnel metadata is present") geneve_rx() will
> not add TUNNEL_GENEVE_OPT flag if there is no geneve option, which cause
> bpf_skb_get_tunnel_opt() return ENOENT and _geneve_get_tunnel() in
> test_tunnel_kern.c drop the packet.
>
> As it should be valid that bpf_skb_get_tunnel_opt() return error when
> there is not tunnel option, there is no need to drop the packet and
> break all geneve rx traffic. Just set opt_class to 0 in this test and
> keep returning TC_ACT_OK.
>
> Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
> ---
LGTM.
Acked-by: William Tu <u9012063@gmail.com>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH net] selftest/bpf: no need to drop the packet when there is no geneve opt
2021-02-24 8:14 [PATCH net] selftest/bpf: no need to drop the packet when there is no geneve opt Hangbin Liu
2021-02-24 19:17 ` William Tu
@ 2021-02-24 20:40 ` patchwork-bot+netdevbpf
1 sibling, 0 replies; 3+ messages in thread
From: patchwork-bot+netdevbpf @ 2021-02-24 20:40 UTC (permalink / raw)
To: Hangbin Liu; +Cc: netdev, kuba, daniel, yihung.wei, davem, bpf, jiong.wang
Hello:
This patch was applied to bpf/bpf.git (refs/heads/master):
On Wed, 24 Feb 2021 16:14:03 +0800 you wrote:
> In bpf geneve tunnel test we set geneve option on tx side. On rx side we
> only call bpf_skb_get_tunnel_opt(). Since commit 9c2e14b48119 ("ip_tunnels:
> Set tunnel option flag when tunnel metadata is present") geneve_rx() will
> not add TUNNEL_GENEVE_OPT flag if there is no geneve option, which cause
> bpf_skb_get_tunnel_opt() return ENOENT and _geneve_get_tunnel() in
> test_tunnel_kern.c drop the packet.
>
> [...]
Here is the summary with links:
- [net] selftest/bpf: no need to drop the packet when there is no geneve opt
https://git.kernel.org/bpf/bpf/c/557c223b643a
You are awesome, thank you!
--
Deet-doot-dot, I am a bot.
https://korg.docs.kernel.org/patchwork/pwbot.html
^ permalink raw reply [flat|nested] 3+ messages in thread
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2021-02-24 8:14 [PATCH net] selftest/bpf: no need to drop the packet when there is no geneve opt Hangbin Liu
2021-02-24 19:17 ` William Tu
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