netdev - Re: [RFC net-next 0/3] bonding: new option API

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Date:	Fri, 10 Jan 2014 12:32:15 -0800
From:	Scott Feldman <sfeldma@...ulusnetworks.com>
To:	Nikolay Aleksandrov <nikolay@...hat.com>
Cc:	Netdev <netdev@...r.kernel.org>,
	Andy Gospodarek <andy@...yhouse.net>,
	Jay Vosburgh <fubar@...ibm.com>,
	Veaceslav Falico <vfalico@...hat.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [RFC net-next 0/3] bonding: new option API


On Jan 10, 2014, at 5:11 AM, Nikolay Aleksandrov <nikolay@...hat.com> wrote:

> Hi,
> This patchset aims to introduce a new option API that can be easily
> extended if necessary and which attempts to remove some common problems
> and code. In the beginning there was support for inter-option dependencies,
> but that turned out to be unnecessary as the only 2 options that _enforce_
> another option to be set prior to setting are up/down delay and they can be
> easily re-worked to not require miimon to be set, so we can spare ourselves
> 100+ lines of checks, dealing with complex dependency errors and such.
> In case this becomes necessary I've kept the old version of this patch-set
> which has it, and can easily re-work it at any time.
> There're still a lot of things to fix/clean but I've done some limited testing
> with the options that are converted and it seems to work.
> The main exported functions (as can be seen) are:
> __bond_opt_set() - to be used when a string is passed which needs to be
>                   converted in the case of BOND_OPTVAL_INTEGER. (sysfs)
> __bond_opt_intset() - to be used when a value is passed to
>                      BOND_OPTVAL_INTEGER (netlink), this function can't
>                      be used for BOND_OPTVAL_STRING options
> These two can be used from inside other options to stop them (e.g., arp_interval
> stopping miimon and vice versa).
> I've also added bond_opt_tryset_rtnl() mostly for sysfs use.
> See the description of patch 01 and the comments inside for more information.
> 
> Value tables of converted options are no longer exported, and can be accessed
> through the API (bond_opt_get_val() & bond_opt_get_flags).
> Another good side-effect is that the error codes are standard for all options
> for the common errors at least.

Nice!

> When/if this patchset is posted for inclusion, I'll have all options converted.
> I actually had them before but while on vacation during December a lot of code
> went in changing the bonding options and have to re-work most of the patches.

Oops, sorry about that ;)

> Some of the future plans for this are:
> Verbose outputting of dependencies (done, just have to polish it)
> Automatic sysfs generation from the bond_opts[].

I had a patch in my queue to do something similar, but yours is so much nicer.  

For sysfs nodes, there is a file permission. I wonder if bond_opts should have a sense of RO, RW, or WO?  Then automatic sysfs generation is even easier.  Hmmm, actually I think the answer is no.  Nevermind.

> Use of the API in bond_check_params() and thus cleaning it up
> Structure for accessor fn parameter passing so we can implement get/set
> in a more general manner
> 
> Sending it with 2 options converted which illustrate the use of different
> features of the API. I've tested them via sysfs.
> 
> Any thoughts, comments and suggestions are very welcome.

Nice job Nik, well done.

-scott

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