[Bug 43] "rte_eth_tx_queue_setup" will be failed to called if argument "tx_conf" not specified

[Bug 43] "rte_eth_tx_queue_setup" will be failed to called if argument "tx_conf" not specified

[bugzilla]

https://dpdk.org/tracker/show_bug.cgi?id=43

            Bug ID: 43
           Summary: "rte_eth_tx_queue_setup" will be failed to called if
                    argument "tx_conf" not specified
           Product: DPDK
           Version: 18.05
          Hardware: x86
                OS: Linux
            Status: CONFIRMED
          Severity: normal
          Priority: Normal
         Component: ethdev
          Assignee: dev@dpdk.org
          Reporter: cnliuhb@gmail.com
  Target Milestone: ---

OS: Ubuntu 16.04 x86_64 in virtualbox

interfaces: 
    0000:00:08.0 '82540EM Gigabit Ethernet Controller 100e' drv=igb_uio
unused=e1000,uio_pci_generic
    0000:00:09.0 '82540EM Gigabit Ethernet Controller 100e' drv=igb_uio
unused=e1000,uio_pci_generic


When start "./build/app/ip_pipeline -l 0-3 -n 1 -- -s ./examples/l2fwd.cli", it
will be failed to add link, and reports the error:
     eth_em_tx_queue_setup(): 0x5f6f6c0: Tx queue offloads 0x801d don't match
port offloads 0x0 or supported port offloads 0xf or supported queue offloads
0xf
Command "link" failed.

The reason is at rte_ethdev.c line 1610, it will set full tx offloads in
function "rte_eth_convert_txq_flags" if default_txconf.txq_flags is 0, which is
wrong.

One proper fix way is driver should set proper "ETH_TXQ_FLAGS_NOXXXX" flags to
default_txconf.txq_flags.

Any idea?

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