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

[Nikolay Aleksandrov <nikolay@redhat.com>]

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.

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.

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[].
 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.

Thanks,
 Nik

CC: Andy Gospodarek <andy@greyhouse.net>
CC: Jay Vosburgh <fubar@us.ibm.com>
CC: Veaceslav Falico <vfalico@redhat.com>
CC: David S. Miller <davem@davemloft.net>


Nikolay Aleksandrov (3):
  bonding: add infrastructure for an option API
  bonding: convert mode setting to use the new option API
  bonding: convert packets_per_slave to use the new option API

 drivers/net/bonding/bond_main.c    |  17 +-
 drivers/net/bonding/bond_netlink.c |   6 +-
 drivers/net/bonding/bond_options.c | 401 +++++++++++++++++++++++++++++++++----
 drivers/net/bonding/bond_options.h |  87 ++++++++
 drivers/net/bonding/bond_sysfs.c   |  44 ++--
 drivers/net/bonding/bonding.h      |   5 +-
 6 files changed, 473 insertions(+), 87 deletions(-)
 create mode 100644 drivers/net/bonding/bond_options.h

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1.8.1.4