[DPDK/ethdev Bug 1382] tap device does not support multiple flow rules with same priority

[bugzilla at dpdk.org]

https://bugs.dpdk.org/show_bug.cgi?id=1382

            Bug ID: 1382
           Summary: tap device does not support multiple flow rules with
                    same priority
           Product: DPDK
           Version: 23.11
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: ethdev
          Assignee: dev at dpdk.org
          Reporter: stephen at networkplumber.org
  Target Milestone: ---

Internally TAP device appears to be using priority as TC index. Which leads to
the following buggy behavior. Drivers should allow multiple flow rules with
same priority.

testpmd> flow create 0 priority 2 ingress pattern eth src is 06:05:04:03:02:01
/ end actions queue index 2 / end
Flow rule #0 created
testpmd> flow create 0 priority 2 ingress pattern eth src is 06:05:04:03:02:00
/ end actions queue index 3 / end
tap_nl_dump_ext_ack(): Filter already exists
tap_flow_create(): Kernel refused TC filter rule creation (17): File exists
port_flow_complain(): Caught PMD error type 2 (flow rule (handle)): overlapping
rules or Kernel too old for flower support: File exists

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