netdev - Re: [PATCH net v2 2/6] bnxt_en: do not allow wildcard matches for L2 flows

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Date:   Wed, 11 Apr 2018 13:41:31 -0700
From:   Michael Chan <michael.chan@...adcom.com>
To:     Andy Gospodarek <andrew.gospodarek@...adcom.com>
Cc:     Jakub Kicinski <kubakici@...pl>,
        David Miller <davem@...emloft.net>,
        Netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net v2 2/6] bnxt_en: do not allow wildcard matches for L2 flows

On Wed, Apr 11, 2018 at 1:31 PM, Andy Gospodarek
<andrew.gospodarek@...adcom.com> wrote:
> On Wed, Apr 11, 2018 at 11:43:14AM -0700, Jakub Kicinski wrote:
>> On Wed, 11 Apr 2018 11:50:14 -0400, Michael Chan wrote:
>> > @@ -764,6 +788,41 @@ static bool bnxt_tc_can_offload(struct bnxt *bp, struct bnxt_tc_flow *flow)
>> >             return false;
>> >     }
>> >
>> > +   /* Currently source/dest MAC cannot be partial wildcard  */
>> > +   if (bits_set(&flow->l2_key.smac, sizeof(flow->l2_key.smac)) &&
>> > +       !is_exactmatch(flow->l2_mask.smac, sizeof(flow->l2_mask.smac))) {
>> > +           netdev_info(bp->dev, "Wildcard match unsupported for Source MAC\n");
>>
>> This wouldn't be something to do in net, but how do you feel about
>> using extack for messages like this?
>>
>
> I agree 'net' would not have been the place for a change like that, but
> I do think that would be a good idea.  It looks like we could easily
> change the ndo_setup_tc to something like this:
>
>         int                     (*ndo_setup_tc)(struct net_device *dev,
>                                                 enum tc_setup_type type,
>                                                 void *type_data,
>                                                 struct netlink_ext_ack *extack);

I think the extack pointer is already in the tc_cls_common_offload
struct inside tc_cls_flower_offload struct.