[dpdk-dev] [v2] ethdev: support Tx queue used count

[Ferruh Yigit]

On 1/23/2024 11:46 AM, Ferruh Yigit wrote:
> On 1/22/2024 1:00 PM, Konstantin Ananyev wrote:
>> CAUTION: This message has originated from an External Source. Please use proper judgment and caution when opening attachments, clicking links, or responding to this email.
>>
>>
>>> From: Jerin Jacob <jerinj at marvell.com>
>>>
>>> Introduce a new API to retrieve the number of used descriptors
>>> in a Tx queue. Applications can leverage this API in the fast path to
>>> inspect the Tx queue occupancy and take appropriate actions based on the
>>> available free descriptors.
>>>
>>> A notable use case could be implementing Random Early Discard (RED)
>>> in software based on Tx queue occupancy.
>>>
>>> Signed-off-by: Jerin Jacob <jerinj at marvell.com>
>>> Reviewed-by: Andrew Rybchenko <andrew.rybchenko at oktetlabs.ru>
>>> Acked-by: Morten Brørup <mb at smartsharesystems.com>
>>>
>>
>> Acked-by: Konstantin Ananyev <konstantin.ananyev at huawei.com>
>>
> 
> Reviewed-by: Ferruh Yigit <ferruh.yigit at amd.com>
> 
> Applied to dpdk-next-net/main, thanks.
> 

There is a build error related to the tracing object.

As 'rte_eth_tx_queue_count()' is static inline, application needs to be
able to access '__rte_eth_trace_tx_queue_count' tracing object, this is
problem in shared library build.

Needs to update '.../ethdev/version.map' and add
'__rte_eth_trace_tx_queue_count'. I am doing the change in next-net and
force push. FYI.


Since there was no user of the 'rte_eth_tx_queue_count()' API, not able
to detect the issue with this patch. But with testpmd support problem
became visible.