netdev - Re: [net-next PATCH 7/7] net: ixgbe: add support for tc

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Message-ID: <56B9CDF2.2050908@gmail.com>
Date:	Tue, 9 Feb 2016 03:30:58 -0800
From:	"Fastabend, John R" <john.fastabend@...il.com>
To:	Jamal Hadi Salim <jhs@...atatu.com>, "Amir Vadai\"" <amir@...ai.me>
Cc:	ogerlitz@...lanox.com, jiri@...nulli.us,
	jeffrey.t.kirsher@...el.com, netdev@...r.kernel.org,
	davem@...emloft.net
Subject: Re: [net-next PATCH 7/7] net: ixgbe: add support for tc_u32 offload

[...]

>>
>> If you leave ht and order off the tc cli I believe 'tc' just
>> picks some semi-arbitrary ones for you. I've been in the habit
>> of always specifying them even for software filters.
>>
> 
> The default table id is essentially 0x800. Default bucket is 0.
> "order" essentially is the filter id. And given you can link tables
> (Nice work John!); essentially the ht:bucket:nodeid is an "address" to
> a specific filter on a specific table and when makes sense a specific
> hash bucket. Some other way to look at it is as a way to construct
> a mapping to a TCAM key.
> What John is doing is essentially taking the nodeid and trying to use
> it as a priority. In otherwise the abstraction is reduced to a linked
> list in which the ordering is how the list is traversed.
> It may work in this case, but i am for being able to explicitly specify
> priorities.

Sorry bombing you with emails Jamal. Another thing to note is ixgbe
doesn't support hash tables explicitly but our other devices do. So
when a hash node is created we can map that onto a hardware block
and actually do the hash.

> 
> cheers,
> jamal
>