Subject: Re: [PATCH net-next 1/2] selftests: openvswitch: fix action formatting

From: Aaron Conole <[email-masked]>
Date: Tue, 11 Jun 2024 10:04:14 -0400

Adrián Moreno <[email-masked]> writes:

> On Mon, Jun 03, 2024 at 03:00:03PM GMT, Aaron Conole wrote:
>> Adrian Moreno <[email-masked]> writes:
>>
>> > In the action formatting function ("dpstr"), the iteration is made over
>> > the nla_map, so if there are more than one attribute from the same type
>> > we only print the first one.
>> >
>> > Fix this by iterating over the actual attributes.
>> >
>> > Signed-off-by: Adrian Moreno <[email-masked]>
>> > ---
>> >  .../selftests/net/openvswitch/ovs-dpctl.py    | 48 +++++++++++--------
>> >  1 file changed, 27 insertions(+), 21 deletions(-)
>> >
>> > diff --git a/tools/testing/selftests/net/openvswitch/ovs-dpctl.py b/tools/testing/selftests/net/openvswitch/ovs-dpctl.py
>> > index 1dd057afd3fb..b76907ac0092 100644
>> > --- a/tools/testing/selftests/net/openvswitch/ovs-dpctl.py
>> > +++ b/tools/testing/selftests/net/openvswitch/ovs-dpctl.py
>> > @@ -437,40 +437,46 @@ class ovsactions(nla):
>> >      def dpstr(self, more=False):
>> >          print_str = ""
>> >
>> > -        for field in self.nla_map:
>> > -            if field[1] == "none" or self.get_attr(field[0]) is None:
>> > +        for attr_name, value in self["attrs"]:
>> > +            attr_desc = next(filter(lambda x: x[0] == attr_name, self.nla_map),
>> > +                             None)
>> > +            if not attr_desc:
>> > +                raise ValueError("Unknown attribute: %s" % attr)
>> > +
>> > +            attr_type = attr_desc[1]
>> > +
>> > +            if attr_type == "none":
>>
>> I agree, this is an issue.  BUT I think it might be better to just
>> filter by field type up front.  See:
>>
>> https://github.com/apconole/linux-next-work/commit/7262107de7170d44b6dbf6c5ea6f7e6c0bb71d36#diff-3e72e7405c6bb4e9842bed5f63883ca930387086bb40d4034e92ed83a5decb4bR441
>>
>> That version I think ends up being much easier to follow.  If you want
>> to take it for your series, feel free.  If you disagree, maybe there's
>> something I'm not considering about it.
>>
>
> I agree. It's better to check field attribute names first. I found this
> during manual testing of the "emit_sample" series but I ended up not
> needing it for the automated one, so I'm OK waiting for your cleanup
> series.

I'll get stuff out this week for it.

> In fact, I also have some patches that try some rework of this part. In
> particular, I tried to unify all attributes under a common base class
> that would handle printing and parsing. That way, most cases would fall
> into "print_str += datum.dpstr(more)" and the "if/elif" block would
> shrink significantly.

That sounds very good.

>> NOTE that version is just a bunch of independent changes that are
>> squashed together.  I have a cleaner version.
>>
>> I can also bundle up the series I have so far and submit, but I didn't
>> want to do that until I got all the pmtu.sh support working.  Maybe it
>> makes sense to send it now though.  Simon, Jakub - wdyt?
>>
>> >                  continue
>> >              if print_str != "":
>> >                  print_str += ","
>> >
>> > -            if field[1] == "uint32":
>> > -                if field[0] == "OVS_ACTION_ATTR_OUTPUT":
>> > -                    print_str += "%d" % int(self.get_attr(field[0]))
>> > -                elif field[0] == "OVS_ACTION_ATTR_RECIRC":
>> > -                    print_str += "recirc(0x%x)" % int(self.get_attr(field[0]))
>> > -                elif field[0] == "OVS_ACTION_ATTR_TRUNC":
>> > -                    print_str += "trunc(%d)" % int(self.get_attr(field[0]))
>> > -                elif field[0] == "OVS_ACTION_ATTR_DROP":
>> > -                    print_str += "drop(%d)" % int(self.get_attr(field[0]))
>> > -            elif field[1] == "flag":
>> > -                if field[0] == "OVS_ACTION_ATTR_CT_CLEAR":
>> > +            if attr_type == "uint32":
>> > +                if attr_name == "OVS_ACTION_ATTR_OUTPUT":
>> > +                    print_str += "%d" % int(value)
>> > +                elif attr_name == "OVS_ACTION_ATTR_RECIRC":
>> > +                    print_str += "recirc(0x%x)" % int(value)
>> > +                elif attr_name == "OVS_ACTION_ATTR_TRUNC":
>> > +                    print_str += "trunc(%d)" % int(value)
>> > +                elif attr_name == "OVS_ACTION_ATTR_DROP":
>> > +                    print_str += "drop(%d)" % int(value)
>> > +            elif attr_type == "flag":
>> > +                if attr_name == "OVS_ACTION_ATTR_CT_CLEAR":
>> >                      print_str += "ct_clear"
>> > -                elif field[0] == "OVS_ACTION_ATTR_POP_VLAN":
>> > +                elif attr_name == "OVS_ACTION_ATTR_POP_VLAN":
>> >                      print_str += "pop_vlan"
>> > -                elif field[0] == "OVS_ACTION_ATTR_POP_ETH":
>> > +                elif attr_name == "OVS_ACTION_ATTR_POP_ETH":
>> >                      print_str += "pop_eth"
>> > -                elif field[0] == "OVS_ACTION_ATTR_POP_NSH":
>> > +                elif attr_name == "OVS_ACTION_ATTR_POP_NSH":
>> >                      print_str += "pop_nsh"
>> > -                elif field[0] == "OVS_ACTION_ATTR_POP_MPLS":
>> > +                elif attr_name == "OVS_ACTION_ATTR_POP_MPLS":
>> >                      print_str += "pop_mpls"
>> >              else:
>> > -                datum = self.get_attr(field[0])
>> > -                if field[0] == "OVS_ACTION_ATTR_CLONE":
>> > +                if attr_name == "OVS_ACTION_ATTR_CLONE":
>> >                      print_str += "clone("
>> > -                    print_str += datum.dpstr(more)
>> > +                    print_str += value.dpstr(more)
>> >                      print_str += ")"
>> >                  else:
>> > -                    print_str += datum.dpstr(more)
>> > +                    print_str += value.dpstr(more)
>> >
>> >          return print_str
>>