lkml.org 
[lkml]   [2022]   [Jul]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: [PATCH net-next 0/3] net: vlan: fix bridge binding behavior and add selftests
From

On 7/30/22 09:48, Sevinj Aghayeva wrote:
> (Resending this because the first email was rejected due to being in HTML.)
>
>
> On Sat, Jul 30, 2022 at 12:46 PM Sevinj Aghayeva
> <sevinj.aghayeva@gmail.com> wrote:
>>
>>
>> On Sat, Jul 30, 2022 at 12:22 PM Nikolay Aleksandrov <razor@blackwall.org> wrote:
>>> On 7/30/22 19:03, Sevinj Aghayeva wrote:
>>>> When bridge binding is enabled for a vlan interface, it is expected
>>>> that the link state of the vlan interface will track the subset of the
>>>> ports that are also members of the corresponding vlan, rather than
>>>> that of all ports.
>>>>
>>>> Currently, this feature works as expected when a vlan interface is
>>>> created with bridge binding enabled:
>>>>
>>>> ip link add link br name vlan10 type vlan id 10 protocol 802.1q \
>>>> bridge_binding on
>>>>
>>>> However, the feature does not work when a vlan interface is created
>>>> with bridge binding disabled, and then enabled later:
>>>>
>>>> ip link add link br name vlan10 type vlan id 10 protocol 802.1q \
>>>> bridge_binding off
>>>> ip link set vlan10 type vlan bridge_binding on
>>>>
>>>> After these two commands, the link state of the vlan interface
>>>> continues to track that of all ports, which is inconsistent and
>>>> confusing to users. This series fixes this bug and introduces two
>>>> tests for the valid behavior.
>>>>
>>>> Sevinj Aghayeva (3):
>>>> net: bridge: export br_vlan_upper_change
>>>> net: 8021q: fix bridge binding behavior for vlan interfaces
>>>> selftests: net: tests for bridge binding behavior
>>>>
>>>> include/linux/if_bridge.h | 9 ++
>>>> net/8021q/vlan.h | 2 +-
>>>> net/8021q/vlan_dev.c | 21 ++-
>>>> net/bridge/br_vlan.c | 7 +-
>>>> tools/testing/selftests/net/Makefile | 1 +
>>>> .../selftests/net/bridge_vlan_binding_test.sh | 143 ++++++++++++++++++
>>>> 6 files changed, 176 insertions(+), 7 deletions(-)
>>>> create mode 100755 tools/testing/selftests/net/bridge_vlan_binding_test.sh
>>>>
>>> Hmm.. I don't like this and don't think this bridge function should be
>>> exported at all.
>>>
>>> Calling bridge state changing functions from 8021q module is not the
>>> proper way to solve this. The problem is that the bridge doesn't know
>>> that the state has changed, so you can process NETDEV_CHANGE events and
>>> check for the bridge vlan which got its state changed and react based on
>>> it. I haven't checked in detail, but I think it should be doable. So all
>>> the logic is kept inside the bridge.
>>
>> Hi Nik,
>>
>> Can please elaborate on where I should process NETDEV_CHANGE events? I'm doing this as part of outreachy project and this is my first kernel task, so I don't know the bridging code that well.
>>
>> Thanks!

good point Nikolay.

Sevinj, see br_vlan_bridge_event and __vlan_device_event  for how both
drivers react to netdev change events.

I have not looked at it in detail yet, but lets explore and discuss if
we can make use of events to achieve same results.

\
 
 \ /
  Last update: 2022-07-31 03:55    [W:0.057 / U:0.304 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site