Re: [PATCH] app/testpmd: fix secondary process cannot dump packet

["lihuisong (C)" <lihuisong@huawei.com>]

在 2022/6/23 20:10, Andrew Rybchenko 写道:
> On 6/23/22 21:15, peng1x.zhang@intel.com wrote:
>> From: Peng Zhang <peng1x.zhang@intel.com>
>>
>> The origin design is whether testpmd is primary or not, if state of
>> receive queue is stop, then packets will not be dumped for show.
>> While to secondary process, receive queue will not be set up, and state
>> will still be stop even if testpmd is started. So packets of stated
>> secondary process cannot be dumped for show.
>>
>> The current design is to secondary process state of queue will be set
>> to start after testpmd is started. Then packets of started secondary
>> process can be dumped for show.
>>
>> Fixes: a550baf24af9 ("app/testpmd: support multi-process")
>> Cc: stable@dpdk.org
>>
>> Signed-off-by: Peng Zhang <peng1x.zhang@intel.com>
>> ---
>>   app/test-pmd/testpmd.c | 12 ++++++++++++
>>   1 file changed, 12 insertions(+)
>>
>> diff --git a/app/test-pmd/testpmd.c b/app/test-pmd/testpmd.c
>> index 205d98ee3d..93ba7e7c9b 100644
>> --- a/app/test-pmd/testpmd.c
>> +++ b/app/test-pmd/testpmd.c
>> @@ -3007,6 +3007,18 @@ start_port(portid_t pid)
>>               if (setup_hairpin_queues(pi, p_pi, cnt_pi) != 0)
>>                   return -1;
>>           }
>> +
>> +        if (port->need_reconfig_queues > 0 && !is_proc_primary()) {
>> +            struct rte_eth_rxconf *rx_conf;
>> +            for (qi = 0; qi < nb_rxq; qi++) {
>> +                rx_conf = &(port->rxq[qi].conf);
>> +                ports[pi].rxq[qi].state =
>> +                    rx_conf->rx_deferred_start ?
>> +                    RTE_ETH_QUEUE_STATE_STOPPED :
>> +                    RTE_ETH_QUEUE_STATE_STARTED;
>
> I'm not sure why it is correct to assume that deferred queue is
> not yet started.
+1.

We should also consider whether the queue state can be changed in secondary.
The 'rx_conf->rx_deferred_start' is the data in secondary.
Why not use 'dev->data->rx_queue_state[]'.

In fact, the issue you memtioned was introduced the following patch:
Fixes: 3c4426db54fc ("app/testpmd: do not poll stopped queues")

The root cause of this issue is that the default value of Rx/Tx queue state
maintained by testpmd is 'RTE_ETH_QUEUE_STATE_STOPPED'. As a result,
secondary doesn't start polling thread to receive packets when start packet
forwarding. And now, secondary cannot receive and send any packets.

Could you fix it together?
>
>> +            }
>> +        }
>> +
>>           configure_rxtx_dump_callbacks(verbose_level);
>>           if (clear_ptypes) {
>>               diag = rte_eth_dev_set_ptypes(pi, RTE_PTYPE_UNKNOWN,
>
> .