netdev - [PATCH iproute2-next v3 0/2] f_flower: match on the number of vlan tags

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Date:   Tue, 26 Apr 2022 12:14:15 +0300
From:   Boris Sukholitko <boris.sukholitko@...adcom.com>
To:     netdev@...r.kernel.org, David Ahern <dsahern@...nel.org>
Cc:     Ilya Lifshits <ilya.lifshits@...adcom.com>,
        Boris Sukholitko <boris.sukholitko@...adcom.com>
Subject: [PATCH iproute2-next v3 0/2] f_flower: match on the number of vlan tags

Hi,

Our customers in the fiber telecom world have network configurations
where they would like to control their traffic according to the number
of tags appearing in the packet.

For example, TR247 GPON conformance test suite specification mostly
talks about untagged, single, double tagged packets and gives lax
guidelines on the vlan protocol vs. number of vlan tags.

This is different from the common IT networks where 802.1Q and 802.1ad
protocols are usually describe single and double tagged packet. GPON
configurations that we work with have arbitrary mix the above protocols
and number of vlan tags in the packet.

The following patch series implement number of vlans flower filter. They
add num_of_vlans flower filter as an alternative to vlan ethtype protocol
matching. The end result is that the following command becomes possible:

tc filter add dev eth1 ingress flower \
  num_of_vlans 1 vlan_prio 5 action drop

Also, from our logs, we have redirect rules such that:

tc filter add dev $GPON ingress flower num_of_vlans $N \
     action mirred egress redirect dev $DEV

where N can range from 0 to 3 and $DEV is the function of $N.

Also there are rules setting skb mark based on the number of vlans:

tc filter add dev $GPON ingress flower num_of_vlans $N vlan_prio \
    $P action skbedit mark $M

Thanks,
Boris.

- v3: rebased to the latest iproute2-next
- v2: add missing f_flower subject prefix

Boris Sukholitko (2):
  f_flower: Add num of vlans parameter
  f_flower: Check args with num_of_vlans

 tc/f_flower.c | 57 ++++++++++++++++++++++++++++++++++++---------------
 1 file changed, 41 insertions(+), 16 deletions(-)

-- 
2.29.2

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