[dpdk-dev] [PATCH v5] ethdev: fix representor port ID search by name

[Singh, Aman Deep]

On 9/30/2021 5:33 PM, Andrew Rybchenko wrote:
> On 9/29/21 2:13 PM, Singh, Aman Deep wrote:
>> On 9/13/2021 4:56 PM, Andrew Rybchenko wrote:
>>> From: Viacheslav Galaktionov <viacheslav.galaktionov at oktetlabs.ru>
>>>
>>> Getting a list of representors from a representor does not make sense.
>>> Instead, a parent device should be used.
>>>
>>> To this end, extend the rte_eth_dev_data structure to include the port ID
>>> of the backing device for representors.
>>>
>>> Signed-off-by: Viacheslav Galaktionov
>>> <viacheslav.galaktionov at oktetlabs.ru>
>>> Signed-off-by: Andrew Rybchenko <andrew.rybchenko at oktetlabs.ru>
>>> Acked-by: Haiyue Wang <haiyue.wang at intel.com>
>>> Acked-by: Beilei Xing <beilei.xing at intel.com>
>>> ---
>>> The new field is added into the hole in rte_eth_dev_data structure.
>>> The patch does not change ABI, but extra care is required since ABI
>>> check is disabled for the structure because of the libabigail bug [1].
>>> It should not be a problem anyway since 21.11 is a ABI breaking release.
>>>
>>> Potentially it is bad for out-of-tree drivers which implement
>>> representors but do not fill in a new parert_port_id field in
>>> rte_eth_dev_data structure. Get ID by name will not work.
>> Did we change name of new field from parert_port_id to backer_port_id.
> Yes, see v5 changelog below.
> It is done to address review notes from Ferruh on v4.

Maybe I did not put it clearly, my bad. Just wanted, in above lines also 
the usage
of "parert_port_id" should be changed.

>
>>> mlx5 changes should be reviwed by maintainers very carefully, since
>>> we are not sure if we patch it correctly.
>>>
>>> [1] https://sourceware.org/bugzilla/show_bug.cgi?id=28060
>>>
>>> v5:
>>>       - try to improve name: backer_port_id instead of parent_port_id
>>>       - init new field to RTE_MAX_ETHPORTS on allocation to avoid
>>>         zero port usage by default
>>>
>>> v4:
>>>       - apply mlx5 review notes: remove fallback from generic ethdev
>>>         code and add fallback to mlx5 code to handle legacy usecase
>>>
>>> v3:
>>>       - fix mlx5 build breakage
>>>
>>> v2:
>>>       - fix mlx5 review notes
>>>       - try device port ID first before parent in order to address
>>>         backward compatibility issue
> [snip]
>