zephyr/tests/unit/net_timeout/testcase.yaml

tests:
  utilities.net_timeout:
    tags: net
    type: unit
net: timeout: refactor to fix multiple problems The net_timeout structure is documented to exist because of behavior that is no longer true, i.e. that `k_delayed_work_submit()` supports only delays up to INT32_MAX milliseconds. Nonetheless, use of 32-bit timestamps within the work handlers mean the restriction is still present. This infrastructure is currently used for two timers with long durations: * address for IPv6 addresses * prefix for IPv6 prefixes The handling of rollover was subtly different between these: address wraps reset the start time while prefix wraps did not. The calculation of remaining time in ipv6_nbr was incorrect when the original requested time in seconds was a multiple of NET_TIMEOUT_MAX_VALUE: the remainder value would be zero while the wrap counter was positive, causing the calculation to indicate no time remained. The maximum value was set to allow a 100 ms latency between elapse of the deadline and assessment of a given timer, but detection of rollover assumed that the captured time in the work handler was precisely the expected deadline, which is unlikely to be true. Use of the shared system work queue also risks observed latency exceeding 100 ms. These calculations could produce delays to next event that exceeded the maximum delay, which introduced special cases. Refactor so all operations that use this structure are encapsulated into API that is documented and has a full-coverage unit test. Switch to the standard mechanism of detecting completed deadlines by calculating the signed difference between the deadline and the current time, which eliminates some special cases. Uniformly rely on the scanning the set of timers to determine the next deadline, rather than assuming that the most recent update is always next. Signed-off-by: Peter Bigot <peter.bigot@nordicsemi.no> 2020-12-26 03:32:42 +08:00			`tests:`
			`utilities.net_timeout:`
			`tags: net`
			`type: unit`