netdev - Re: [patch net-next v3 05/10] net: sched: keep track of offloaded filters and check tc offload feature

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Date:   Fri, 15 Dec 2017 10:09:44 +0100
From:   Jiri Pirko <jiri@...nulli.us>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>
Cc:     netdev@...r.kernel.org, davem@...emloft.net, jhs@...atatu.com,
        xiyou.wangcong@...il.com, mlxsw@...lanox.com, andrew@...n.ch,
        vivien.didelot@...oirfairelinux.com, f.fainelli@...il.com,
        michael.chan@...adcom.com, ganeshgr@...lsio.com,
        saeedm@...lanox.com, matanb@...lanox.com, leonro@...lanox.com,
        idosch@...lanox.com, simon.horman@...ronome.com,
        pieter.jansenvanvuuren@...ronome.com, john.hurley@...ronome.com,
        alexander.h.duyck@...el.com, ogerlitz@...lanox.com,
        john.fastabend@...il.com, daniel@...earbox.net
Subject: Re: [patch net-next v3 05/10] net: sched: keep track of offloaded
 filters and check tc offload feature

Thu, Dec 14, 2017 at 07:49:41PM CET, jakub.kicinski@...ronome.com wrote:
>On Thu, 14 Dec 2017 14:10:45 +0100, Jiri Pirko wrote:
>> >Why? Just a namechange?
>> >
>> >  
>> >>IIUC the problem is we don't know whether the driver/callee of the new
>> >>port is aware of previous callbacks/filters and we can't replay them.  
>> 
>> Well, the problem is a bit different.
>> There are 2 scenarios when we need to fail here:
>> 1) tc offload feature is turned off, there are some filters offloaded in
>>    the block. That is what I commented above.
>> 2) tc offload feature is turned on, there are some filters offloaded in
>>    the block but the block is not accounted by the driver. This is
>>    because of the lack or replay. This is taken care of in the beginning
>>    of __tcf_block_cb_register function - see below, there is a comment
>>    there.
>
>Restating in code terms, shouldn't this:
>
>+	tcf_block_offload_cmd(block, dev, ei, TC_BLOCK_BIND);
>+	return 0;
>
>return the error like this:
>
>	return tcf_block_offload_cmd(block, dev, ei, TC_BLOCK_BIND);
>
>We expect simple drivers to do this:
>
>	case TC_BLOCK_BIND:
>		return tcf_block_cb_register(f->block, mycb,
>					     priv, priv);
>
>Which will return an error for shared offloaded block, just need to
>propagate it.

Got it. Will do. Thanks!