ouroboros/src/lib, branch 0.17.4

lib: Fix retransmission DRF update

2020-05-02T09:34:28+00:00

The retransmission was always disabling the DRF flag. This caused problems with the loss of the first packet, which of course needs a DRF flag set. The retransmitted packet will now contain a the original DRF flag and an updated ack number. Signed-off-by: Dimitri Staessens Signed-off-by: Sander Vrijders

lib: Create an rxmwheel per flow

2020-05-02T09:34:28+00:00

The single retransmission wheel caused locking headaches as the calls for different flows could block on the same rxmwheel. This stabilizes the stack, but if the rdrbuff gets full there can now be big delays. Signed-off-by: Dimitri Staessens Signed-off-by: Sander Vrijders

lib: Fix updating retransmission wheel

2020-05-01T08:13:10+00:00

Fixes infinite rescheduling with RTO getting lower than the timerwheel resolution. For very low RTO values we'd need a big packet buffer with the current memory allocator implementation (rdrbuff). Setting a (configurable) minimum RTO (250 us) reduces this need. Signed-off-by: Dimitri Staessens Signed-off-by: Sander Vrijders

lib: Unmount stale RIB directories

2020-04-30T10:32:53+00:00

If Ouroboros crashed, the RIB directory might still be mounted. This checks if this is the case, then unmounts it. Signed-off-by: Sander Vrijders Signed-off-by: Dimitri Staessens

lib: Stabilize FRCP under packet loss conditions

2020-04-30T09:54:44+00:00

There were a bunch of bugs in FRCP that urgently needed fixing. Now data QoS is usable even with heavy packet loss (within some parameters). The current RTT estimator is the IETF one. It should be updated to the improved one used in the Linux kernel once the A-timer (ACKs without data) and graceful shutdown are implemented. Signed-off-by: Dimitri Staessens Signed-off-by: Sander Vrijders

irmd: Fix cleanup of shm_flow_set

2020-03-20T11:10:44+00:00

The shm_flowset destroy was using the irmd pid, resulting in wrong unlinks. The irmd was not cleaning up the process table, resulting in shm leaks if there were still running processes on exit. Signed-off-by: Dimitri Staessens Signed-off-by: Sander Vrijders

lib: Fix thread management in thread pool manager

2020-03-20T09:42:52+00:00

The thread pool manager wasn't counting working threads when deciding to create new ones, resulting in constant starting of new threads when threads were busy. Signed-off-by: Dimitri Staessens Signed-off-by: Sander Vrijders

lib: Return number of written bytes on flow_write

2020-03-15T13:30:58+00:00

This is more in line with the write() system call and prepares for partial writes. Partial writes are disabled by default (and not yet implemented). Signed-off-by: Dimitri Staessens Signed-off-by: Sander Vrijders

lib: Change return type of fevent to ssize_t

2020-03-15T13:26:49+00:00

The return type was still an int, but since it returns the number of events, it should be an ssize_t. Signed-off-by: Dimitri Staessens Signed-off-by: Sander Vrijders

irm: Revise naming API

2020-03-15T13:20:38+00:00

This revises the naming API to treat names (or reg_name in the source) as first-class citizens of the architecture. This is more in line with the way they are described in the article. Operations have been added to create/destroy names independently of registering. This was previously done only as part of register, and there was no way to delete a name from the IRMd. The create call now allows specifying a policy for load-balancing incoming flows for a name. The default is the new round-robin load-balancer, the previous behaviour is still available as a spillover load-balancer. The register calls will still create a name if it doesn't exist, with the default round-robin load-balancer. The tools now have a "name" section, so the format is now irm name ... Signed-off-by: Dimitri Staessens Signed-off-by: Sander Vrijders