On Tue, 1 Sep 2020 09:33:18 +0800
"Min Hu (Connor)" [off-list ref] wrote:

From: Huisong Li <lihuisong@huawei.com>

Currently, only statistics of rx/tx queues with queue_id less than
RTE_ETHDEV_QUEUE_STAT_CNTRS can be displayed. If there is a certain
application scenario that it needs to use 256 or more than 256 queues
and display all statistics of rx/tx queue. At this moment, we have to
change the macro to be equaled to the queue number.

However, modifying the macro to be greater than 256 will trigger
many errors and warnings from test-pmd, PMD driver and librte_ethdev
during compiling dpdk project. But it is possible and permited that
rx/tx queue number is greater than 256 and all statistics of rx/tx
queue need to be displayed. In addition, the data type of rx/tx queue
number in rte_eth_dev_configure API is 'uint16_t'. So It is unreasonable
to use the 'uint8_t' type for variables that control which per-queue
statistics can be displayed.

Fixes: ed30d9b691b2 ("app/testpmd: add stats per queue")
Fixes: 09c7e63a71f9 ("net/memif: introduce memory interface PMD")
Fixes: abf7275bbaa2 ("ixgbe: move to drivers/net/")
Fixes: e6defdfddc3b ("net/igc: enable statistics")
Fixes: 2265e4b4e84b ("net/octeontx2: add basic stats operation")
Fixes: 6c3169a3dc04 ("virtio: move to drivers/net/")
Cc: stable@dpdk.org

Signed-off-by: Huisong Li <lihuisong@huawei.com>
Reviewed-by: huwei <redacted>
Reviewed-by: liudongdong <redacted>
---

This looks like a reasonable way to address this.
But it does break the API, and it wasn't announced previously.
Since it is minor and compatible change I am ok with doing it for 20.11.
Please update the release notes.