Subject: Re: [PATCH net-next 2/2] selftests: openvswitch: set value to nla flags

From: Aaron Conole <[email-masked]>
Date: Mon, 03 Jun 2024 15:02:46 -0400

Adrian Moreno <[email-masked]> writes:

> Netlink flags, although they don't have payload at the netlink level,
> are represented as having a "True" value in pyroute2.
>
> Without it, trying to add a flow with a flag-type action (e.g: pop_vlan)
> fails with the following traceback:
>
> Traceback (most recent call last):
>   File "[...]/ovs-dpctl.py", line 2498, in <module>
>     sys.exit(main(sys.argv))
>              ^^^^^^^^^^^^^^
>   File "[...]/ovs-dpctl.py", line 2487, in main
>     ovsflow.add_flow(rep["dpifindex"], flow)
>   File "[...]/ovs-dpctl.py", line 2136, in add_flow
>     reply = self.nlm_request(
>             ^^^^^^^^^^^^^^^^^
>   File "[...]/pyroute2/netlink/nlsocket.py", line 822, in nlm_request
>     return tuple(self._genlm_request(*argv, **kwarg))
>                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>   File "[...]/pyroute2/netlink/generic/__init__.py", line 126, in
> nlm_request
>     return tuple(super().nlm_request(*argv, **kwarg))
>            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>   File "[...]/pyroute2/netlink/nlsocket.py", line 1124, in nlm_request
>     self.put(msg, msg_type, msg_flags, msg_seq=msg_seq)
>   File "[...]/pyroute2/netlink/nlsocket.py", line 389, in put
>     self.sendto_gate(msg, addr)
>   File "[...]/pyroute2/netlink/nlsocket.py", line 1056, in sendto_gate
>     msg.encode()
>   File "[...]/pyroute2/netlink/__init__.py", line 1245, in encode
>     offset = self.encode_nlas(offset)
>              ^^^^^^^^^^^^^^^^^^^^^^^^
>   File "[...]/pyroute2/netlink/__init__.py", line 1560, in encode_nlas
>     nla_instance.setvalue(cell[1])
>   File "[...]/pyroute2/netlink/__init__.py", line 1265, in setvalue
>     nlv.setvalue(nla_tuple[1])
>                  ~~~~~~~~~^^^
> IndexError: list index out of range
>
> Signed-off-by: Adrian Moreno <[email-masked]>
> ---

Acked-by: Aaron Conole <[email-masked]>

I don't know which pyroute2 version I had used when I tested this
previously, but even on my current system I get this error now.  Thanks
for the fix.

>  tools/testing/selftests/net/openvswitch/ovs-dpctl.py | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/tools/testing/selftests/net/openvswitch/ovs-dpctl.py b/tools/testing/selftests/net/openvswitch/ovs-dpctl.py
> index b76907ac0092..a2395c3f37a1 100644
> --- a/tools/testing/selftests/net/openvswitch/ovs-dpctl.py
> +++ b/tools/testing/selftests/net/openvswitch/ovs-dpctl.py
> @@ -537,7 +537,7 @@ class ovsactions(nla):
>              for flat_act in parse_flat_map:
>                  if parse_starts_block(actstr, flat_act[0], False):
>                      actstr = actstr[len(flat_act[0]):]
> -                    self["attrs"].append([flat_act[1]])
> +                    self["attrs"].append([flat_act[1], True])
>                      actstr = actstr[strspn(actstr, ", ") :]
>                      parsed = True