[DPDK/ethdev Bug 1384] PCAP PMD reconfiguration failure

[DPDK/ethdev Bug 1384] PCAP PMD reconfiguration failure

[bugzilla]

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https://bugs.dpdk.org/show_bug.cgi?id=1384

            Bug ID: 1384
           Summary: PCAP PMD reconfiguration failure
           Product: DPDK
           Version: 22.11
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: ethdev
          Assignee: dev@dpdk.org
          Reporter: matias.elo@nokia.com
  Target Milestone: ---

Created attachment 275
  --> https://bugs.dpdk.org/attachment.cgi?id=275&action=edit
l2fwd patch to demonstrate issue

When a PCAP PMD Ethernet device is first configured, the selected number of RX
and TX queues overrides the max values initially returned by
rte_eth_dev_info_get() (max_rx_queues, max_tx_queues). Now, if one tries to
reconfigure the device with a larger queue count(s), rte_eth_dev_configure()
will fail to an internal capability check. Reconfiguring devices this way is
useful for example in CI usage.

The issue can be reproduced with the attached simple patch to l2fwd example.

Example output from patched l2fwd (v22.11.4):

$ sudo ./examples/dpdk-l2fwd --no-pci --vdev net_pcap0,iface=lo -- -p 0x1
EAL: Detected CPU lcores: 48
EAL: Detected NUMA nodes: 1
EAL: Detected static linkage of DPDK
EAL: Multi-process socket /var/run/dpdk/rte/mp_socket
EAL: Selected IOVA mode 'VA'
EAL: VFIO support initialized
TELEMETRY: No legacy callbacks, legacy socket not created
MAC updating enabled
Notice: odd number of ports in portmask.
Lcore 0: RX port 0 TX port 0
Initializing port 0... 
  orig. max_rx_queues: 1
  orig. max_tx_queues: 1
  after conf max_rx_queues: 0
  after conf max_tx_queues: 1
Ethdev port_id=0 nb_rx_queues=1 > 0
EAL: Error - exiting with code: 1
  Cause: Cannot configure device: err=-22, port=0

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