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authorDimitri Staessens <dimitri@ouroboros.rocks>2020-09-20 13:04:52 +0200
committerSander Vrijders <sander@ouroboros.rocks>2020-09-25 11:52:51 +0200
commit1e3a9e464cbb2f02c057e9f63c1f270ff27530f4 (patch)
tree5193774eea2bb204d062cc47e178a3702d4790a4 /src/ipcpd/ipcp.c
parent5f468ee5e02a0d63ed8ad7420ee1beda87e524d6 (diff)
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lib: Complete retransmission logic
This completes the retransmission (automated repeat-request, ARQ) logic, sending (delayed) ACK messages when needed. On deallocation, flows will ACK try to retransmit any remaining unacknowledged messages (unless the FRCTFLINGER flag is turned off; this is on by default). Applications can safely shut down as soon as everything is ACK'd (i.e. the current Delta-t run is done). The activity timeout is now passed to the IPCP for it to sleep before completing deallocation (and releasing the flow_id). That should be moved to the IRMd in due time. The timerwheel is revised to be multi-level to reduce memory consumption. The resolution bumps by a factor of 1 << RXMQ_BUMP (16) and each level has RXMQ_SLOTS (1 << 8) slots. The lowest level has a resolution of (1 << RXMQ_RES) (20) ns, which is roughly a millisecond. Currently, 3 levels are defined, so the largest delay we can schedule at each level is: Level 0: 256ms Level 1: 4s Level 2: about a minute. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
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