[dpdk-dev] [PATCH v2] ethdev: warn once for buggy applications

[Ferruh Yigit]

On 10/27/2021 1:46 PM, Thomas Monjalon wrote:
>>> Warning continuously is a pain when developping or if a unit test
>>> is/gets broken.
>>>
>>> It could also be a problem if application behaves badly only in some
>>> corner cases and a DoS results of those logs being continuously displayed.
>>>
>>> Let's warn once per port and per rx/tx.
>>>
>>> Getting such a log is scary, but let's make it more eye catching by
>>> dumping a backtrace with it.
>>>
>>> Tested by introducing a bug in testpmd:
>>>   static int
>>>   eth_dev_start_mp(uint16_t port_id)
>>>   {
>>> -       if (is_proc_primary())
>>> +       if (!is_proc_primary())
>>>                  return rte_eth_dev_start(port_id);
>>>
>>>          return 0;
>>>
>>> Then, running a basic null test:
>>> $ ./devtools/test-null.sh
>>> ...
>>> Start automatic packet forwarding
>>> io packet forwarding - ports=2 - cores=1 - streams=2 - NUMA support
>>>    enabled, MP allocation mode: native
>>> Logical Core 1 (socket 0) forwards packets on 2 streams:
>>>    RX P=0/Q=0 (socket 0) -> TX P=1/Q=0 (socket 0) peer=02:00:00:00:00:01
>>>    RX P=1/Q=0 (socket 0) -> TX P=0/Q=0 (socket 0) peer=02:00:00:00:00:00
>>>
>>> lcore 0 called rx_pkt_burst for not ready port 0
>>> 8: [build/app/dpdk-testpmd() [0x59e839]]
>>> 7: [/lib64/libc.so.6(__libc_start_main+0xf5) [0x7ff481b69555]]
>>> 6: [build/app/dpdk-testpmd(main+0x54b) [0x662d24]]
>>> 5: [build/app/dpdk-testpmd(start_packet_forwarding+0x263) [0x65e795]]
>>> 4: [build/app/dpdk-testpmd() [0x65e1be]]
>>> 3: [build/app/dpdk-testpmd() [0x65a996]]
>>> 2: [build/app/dpdk-testpmd() [0xa6cbc7]]
>>> 1: [build/app/dpdk-testpmd(rte_dump_stack+0x27) [0xaee796]]
>>> lcore 0 called rx_pkt_burst for not ready port 1
>>> 8: [build/app/dpdk-testpmd() [0x59e839]]
>>> 7: [/lib64/libc.so.6(__libc_start_main+0xf5) [0x7ff481b69555]]
>>> 6: [build/app/dpdk-testpmd(main+0x54b) [0x662d24]]
>>> 5: [build/app/dpdk-testpmd(start_packet_forwarding+0x263) [0x65e795]]
>>> 4: [build/app/dpdk-testpmd() [0x65e1be]]
>>> 3: [build/app/dpdk-testpmd() [0x65a996]]
>>> 2: [build/app/dpdk-testpmd() [0xa6cbc7]]
>>> 1: [build/app/dpdk-testpmd(rte_dump_stack+0x27) [0xaee796]]
>>>    io packet forwarding packets/burst=32
>>>    nb forwarding cores=1 - nb forwarding ports=2
>>>    port 0: RX queue number: 1 Tx queue number: 1
>>>      Rx offloads=0x0 Tx offloads=0x0
>>>
>>> Fixes: c87d435a4d79 ("ethdev: copy fast-path API into separate structure")
>>>
>>> Signed-off-by: David Marchand <david.marchand at redhat.com>
>>> ---
>>> Changes since v1:
>>> - removed diff banner in commitlog,
>>> - renamed vars,
>>> - removed unneeded cast on anonymous struct in initialisation construct,
>>> - added check on queue pointer,
>>>
>>> ---
>>
>> Acked-by: Konstantin Ananyev <konstantin.ananyev at intel.com>
>> Tested-by: Konstantin Ananyev <konstantin.ananyev at intel.com>
> 
> Acked-by: Thomas Monjalon <thomas at monjalon.net>
> 
> 

Applied to dpdk-next-net/main, thanks.