netdev - Re: mlx5 support tc accept action

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Date:   Fri, 6 Dec 2019 20:28:10 +0000
From:   Mark Bloch <markb@...lanox.com>
To:     Tonghao Zhang <xiangxia.m.yue@...il.com>,
        Saeed Mahameed <saeedm@....mellanox.co.il>
CC:     Ariel Levkovich <lariel@...lanox.com>,
        Roi Dayan <roid@...lanox.com>,
        Saeed Mahameed <saeedm@...lanox.com>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: mlx5 support tc accept action



On 12/5/2019 23:51, Tonghao Zhang wrote:
> On Fri, Dec 6, 2019 at 5:30 AM Saeed Mahameed <saeedm@....mellanox.co.il> wrote:
>>
>> On Wed, Dec 4, 2019 at 10:41 PM Tonghao Zhang <xiangxia.m.yue@...il.com> wrote:
>>>
>>> Hi Roi, Saeed
>>> In one cause, we want the "accept" action: the IP of VF will be
>>> "accept", and others
>>> packets will be done with other actions(e.g. hairpin rule to other VF).
>>>
>>> For example:
>>>
>>> PF0=enp130s0f0
>>> VF0_REP=enp130s0f0_0
>>> VF0=p4p1_0
>>> VF1=p4p2_0 # belong to PF1
>>> VF0_IP=3.3.3.200
>>>
>>> ethtool -K $PF0 hw-tc-offload on
>>> ethtool -K $VF0 hw-tc-offload on
>>> tc qdisc add dev $PF0 ingress
>>> tc qdisc add dev $VF0 ingress
>>> tc filter add dev $PF0 protocol all parent ffff: prio 10 handle 1
>>> flower skip_sw action mirred egress redirect dev $VF0_REP
>>> tc filter add dev $VF0 protocol ip parent ffff: prio 1 handle 3 flower
>>> skip_sw dst_ip $VF0_IP action pass
>>> tc filter add dev $VF0 protocol all parent ffff: prio 10 handle 2
>>> flower skip_sw action mirred egress redirect dev $VF1
>>>
>>> When I change the driver, the rule which action "action pass", can be
>>> offloaded, but it didn't work.
>>> +               case FLOW_ACTION_ACCEPT:
>>> +                   action |= MLX5_FLOW_CONTEXT_ACTION_ALLOW;
>>> +                   break;
>>>
>>>
>>> How can we support it, this function is import for us.
>>
>> Hi Tonghao,
>> where did you add the above code to ?
>> parse_tc_fdb_actions() ? or parse_tc_nic_actions() ?
>> in your use case you need to add it to parse_tc_nic_actions(),
>>
>> currently in mlx5 we don't support ALLOW/pass actions.
>> it might be a little more complicated than what you did in order to
>> support this,

Yep, from a quick look at the code we don't support ALLOW + counter so a change
will be have to made in counter_is_valid() and then account for that on deletion in
del_sw_hw_rule().

Doesn't look too complicated to add if needed (It was just never requested/needed).

>> as a work around you can use action: FLOW_ACTION_MARK in the tc
>> command line rule without any change in the driver.
>> or change your code to do MLX5_FLOW_CONTEXT_ACTION_FWD_DEST instead of
>> MLX5_FLOW_CONTEXT_ACTION_ALLOW
> Hi Saeed, FLOW_ACTION_MARK works fine for us. Thanks.

Great.

Mark

> 
>> Adding Mark and Ariel, they might have better feedback than mine
>>
>> Thanks,
>> Saeed/