[dpdk-dev] [Bug 277] eventdev sw rx adapter enqueue buffer may store packets indefinitely

[dpdk-dev] [Bug 277] eventdev sw rx adapter enqueue buffer may store packets indefinitely

[bugzilla]

https://bugs.dpdk.org/show_bug.cgi?id=277

            Bug ID: 277
           Summary: eventdev sw rx adapter enqueue buffer may store
                    packets indefinitely
           Product: DPDK
           Version: 19.05
          Hardware: All
                OS: All
            Status: CONFIRMED
          Severity: normal
          Priority: Normal
         Component: eventdev
          Assignee: dev@dpdk.org
          Reporter: matias.elo@nokia.com
  Target Milestone: ---

The sw eventdev rx adapter has an internal enqueue buffer
'rx_adapter->event_enqueue_buffer', which stores packets received from the NIC
until at least BATCH_SIZE (=32) packets have been received before enqueueing
them to eventdev. If not enough packets (BATCH_SIZE) are received or the system
stops receiving new packets, existing packets stored in the enqueue buffer are
never passed to eventdev.

Situation like this occurs easily for example when performing validation
testing with predefined test packets. Additionally, if packet receive rate is
slow, this adds a considerable amount of extra delay.

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