Also, preserve and restore current configuration, so I don't get mad
when checking with MAKEALL during my tests for new feature.

The rationale for this is that wrpc-sw will soon select different ppsi
choices according to its own configuration, through $(PPSI-CFG-y).
Actually, it already does for the host process build.

MAKEALL must obey this choice, so we trim ppsi configuration
each time we reconfigure wrpc (removing the file would spit an
error instead).

Then, our Makefile forces a ppsi reconfig if ppsi/.config is missing
*or* empty.
Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

The new config tools are more picky. We got:

   Kconfig:22:warning: defaults for choice values not supported

and

  warning: (WR_SWITCH) selects UART which has unmet direct dependencies
             (DEVELOPER && EMBEDDED_NODE)

The latter is fixed adding WR_SWITCH in the dependencies. The former
is worked-around by using "IS_XINT" and friends in "choice", and
then "XINT" replicates the "IS_" choice.  I dislike it, because it's
repetition, but we really need CONFIG_PRINTF_XINT and friends in
pp_printf/
Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

remove rules like:
--allmodconfig
--kvmconfig
--xenconfig
--tinyconfig

change directory with configs
Signed-off-by: Adam Wujek <adam.wujek@cern.ch>

Now it is also possible to use for dot-config configuration:
make nconfig
make xconfig
make gconfig
make menuconfig

kconfig is taken from the linux kernel repo commit v4.8-rc1-19-g81abf25:
e50bd235 Merge tag 'lkdtm-v4.8-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linuxSigned-off-by: Adam Wujek <adam.wujek@cern.ch>

Add conditional compilation of support of aux diag registers and SNMP for
these registers.
Signed-off-by: Adam Wujek <adam.wujek@cern.ch>

Signed-off-by: Adam Wujek <adam.wujek@cern.ch>

Signed-off-by: Adam Wujek <adam.wujek@cern.ch>

It does not make sense when the init is stored in flash and the board has no
EEPROM. Otherwise, storage_init() calls mi2c_devprobe() if needed.

Signed-off-by: Adam Wujek <adam.wujek@cern.ch>

This function can be used to discard packets with the wrong destination IP.
Signed-off-by: Adam Wujek <adam.wujek@cern.ch>

Add the mini SNMP SNMP responder to the WRPC.
Signed-off-by: Adam Wujek <adam.wujek@cern.ch>

Tread as error when 0 is returned from the set_value function.
Signed-off-by: Adam Wujek <adam.wujek@cern.ch>

Copy the pointer even it is not used now
Signed-off-by: Adam Wujek <adam.wujek@cern.ch>

Move wrpcSfpEntry and wrpcTemperatureEntry to be a part of limb not a twig.
Signed-off-by: Adam Wujek <adam.wujek@cern.ch>

Add support for ASN_UNSIGNED to set_value and get_value.
Also return 0 if ASN not supported.
Signed-off-by: Adam Wujek <adam.wujek@cern.ch>

Fix problems reported by smilint (smilint lib/WR-WRPC-MIB.txt)
Signed-off-by: Adam Wujek <adam.wujek@cern.ch>

Signed-off-by: Adam Wujek <adam.wujek@cern.ch>

Add an object to restart PTP via SNMP (wrpcPtpConfigRestart).
Also don't restart ppsi after SFP updates in the flash.
Signed-off-by: Adam Wujek <adam.wujek@cern.ch>

When snmpset is performed on not existing or read only OID, then response
packet does not contain to-be-set value. Due to that, returning packet is
shorter. It is necessary to recalculate sizes of the fields inside the response
packet.
Signed-off-by: Adam Wujek <adam.wujek@cern.ch>

Pass returned value from twig functions (group and table) in the response.
Now setting read only values return proper error (SNMP_ERR_READONLY).
Signed-off-by: Adam Wujek <adam.wujek@cern.ch>