There was a bug in wrsTimingStatus_data_fill that even if not all of the
wrsPtpDataTable_data_fill, wrsSpllStatus_data_fill or
wrsPortStatusTable_data_fill were updated all objects in the
wrsTimingStatusGroup were updated. As a side effect it may happen that all
prev_ values were compared with exactly the same set of data (since there was
no update in particular data). By this delta were zero and wrong value was set.

The bug may be hit when snmp requests rate is lower than snmpd's cache timeout.
Signed-off-by: Adam Wujek <adam.wujek@cern.ch>

Before at the beginnig of the hwinfo script, hwinfo_error was written to the status file.
Then if there was success or warning then update was written to status file.
Snmpd could read error even there was no error.
Signed-off-by: Adam Wujek <adam.wujek@cern.ch>

Try again when read error from file
Signed-off-by: Adam Wujek <adam.wujek@cern.ch>

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

Up eth0 before trying to get URL to dot-config via DHCP (needed when switch
start without IP address)

fix missing "CONFIG_" in CONFIG_DOTCONF_SOURCE_LOCAL

run /usr/share/udhcpc/default.script when getting URL to dot-config to get
IP address to avoid another DHCP requests just to get IP.
Signed-off-by: Adam Wujek <adam.wujek@cern.ch>

By this avoid log entires during normal startup:
snmpd[1138]: wrsPortStatusTable_data_fill: Unable to read PPSI's shmem
Signed-off-by: Adam Wujek <adam.wujek@cern.ch>

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

Add commit:
increase Announce rcv timeout to 20 - workaround for the WRS
Signed-off-by: Adam Wujek <adam.wujek@cern.ch>

Support getting URL to dot-config via DHCP

Add support of different dot-config sources.
Improve some help information.
Signed-off-by: Adam Wujek <adam.wujek@cern.ch>

Only for the case when dot-config source changed during run-time.
Signed-off-by: Adam Wujek <adam.wujek@cern.ch>

force-dhcp can be used to retrieve a URL to the dot-config, which is downloaded
during boot.
try-dhcp the same as above but don't complain about unsuccessful receive of the
URL via DHCP to SNMP.

Update:
--MIB - add tryDhcp and forceDhcp to the wrsConfigSource object; add
        dhcpError to the wrsBootConfigStatus object
--SNMPd - same as the above; don't error in wrsBootConfigStatus when tryDhcp
          fails
--dot-config's script - support new dot-config sources
--Kconfig - support new dot-config sources
--wrs_failures
--wrs-user-manual
--wrs_release_defconfig - add new items
--create new script for udhcpc to save "filename" configuration field retrieved
  from DHCP server; it contains the URL to the dot-config to be downloaded.
Signed-off-by: Adam Wujek <adam.wujek@cern.ch>

NOTE: This commit brings non compatible changes into MIB. It should never
happen after release!

Change wrsConfigSource to inform whether dot-config source was local or remote.
Before it contained also information about remote protocol.
Now information from wrsConfigSource, wrsConfigSourceHost and
wrsConfigSourceFilename is stored in wrsConfigSourceUrl.

wrsRestartReasonMonit is moved into place where wrsConfigSourceFilename was
before.
Signed-off-by: Adam Wujek <adam.wujek@cern.ch>

Rebooting can now be done with a different timeout:

* Flashing the full wrs-firmware.tar takes ~120s
* Flashing some part takes ~90s
* Rebooting is ~30s

Threshold value used to count offset errors
(SNMP's wrsPtpClockOffsetErrCnt object).
Signed-off-by: Adam Wujek <adam.wujek@cern.ch>

Fix problem with hanging send in PPSI

The bug we were facing was in wr-nic.ko (previous commit fixes it),
but we made a few changes to the better in ppsi handing of timestamps
(wrs-socket.c) while looking for that problem. So this picks those
4 commits of ppsi:
wrs-socket: decrease the timeout when waiting for a timestamp
wrs-socket: simplify the code retrieving timestamps
unix and wrs socket: open in non-blocking mode and report write errors
wrs-socket: use POLLERR for timestamps
Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

When the switch is loaded, some PTP outgoing frames get discarded, so we
never get back the timestamp interrupt.  By round-robin'ing the slots,
we get back to the "busy" one, which holds an skb structure that must be
released.

Without this freeing, the skb remains in the output queue of the
socket, and after a while we get EAGAIN in send() because the buffer
is full (400 frames, more or less). And the ptp port is stuck until we
reopen the socket.

This diagnosis exposed the fact that it's not an overflow of pending
descriptors, so I change the message from

  descriptor overflow: tx timestamp pending

to

  discarding tx frame that got no timestamp

Finally, this is pr_warn, not pr_err as we now know it's expected.
Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

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

When process is restarted more than 5 times within 10*10 seconds (10 cycles,
each 10 seconds), then monit triggers system restart. Save information, which
process caused restart. Store it in flash to survive over restart, then copy
to /tmp.
Signed-off-by: Adam Wujek <adam.wujek@cern.ch>

Shorten timeout for opening shmem (wrs_shm_get). Clients use their own sleep
between tries.
Signed-off-by: Adam Wujek <adam.wujek@cern.ch>

SNMPd will try to connect to HAL's and PPSI's shmem at startup. If HAL or PPSI
is not started SNMPd would continue instead of exiting. Later when data from
shmem is needed SNMPd will try to open shmem again. By this it would be
possible to figure out what is happening on switch when HAL, PPSI or RTUd
failed to start.
Signed-off-by: Adam Wujek <adam.wujek@cern.ch>

Report when wrs_watchdog is not present in process' list.
Signed-off-by: Adam Wujek <adam.wujek@cern.ch>

Retry next time when there is an error in "run_once" sections.
Signed-off-by: Adam Wujek <adam.wujek@cern.ch>

When parameter -g is used there is no need to check other parameters.
Change to avoid waiting for HAL's shmem to be available.
Signed-off-by: Adam Wujek <adam.wujek@cern.ch>

Make possible to start snmpd without successful open of RTUd's shmem
(in other words having RTUd running). SNMPd shall start even on faulty system
since it is a way to report if and what is wrong.
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>

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