Comment 0 for bug 1922494

[impact]
Add Support for flow counters offset for bulk counters on kernel side.
Currently Ubuntu 20.04 has 'flow counters offset for bulk counters' on user space side only with these 3 rdma-core patches from v27.0
3956cf74 mlx5: Add support for bulk flow counters steering actions
65ed59c6 Update kernel headers
b32eee70 mlx5: Fix typos

[test case]
/* download and install dpdk from github (issue do not reproduce with inbox dpdk) */
$ git clone https://github.com/mellanox/dpdk.org
$ cd dpdk.org/

/* install dependencies if needed */
$ apt-get install -y python3-pyelftools python-pyelftools
$ apt install meson

$ meson build-meson
$ ninja -C build-meson/

/* run dpdk-testpmd with mellanox HCA (I used CX5) 0000:05:00.0, 0000:05:00.1 are pci id for the cx5 devices */

/<path to dpdk folder>/dpdk.org/build-meson/app/dpdk-testpmd -v -n 4 -w 0000:05:00.0,txq_inline=147,rx_vec_en=1 -w 0000:05:00.1,txq_inline=147,rx_vec_en=1 -- --mbcache=512 -i --nb-cores=7 --txd=8192 --rxd=8192 --burst=64

EAL: Detected 12 lcore(s)
EAL: Detected 2 NUMA nodes
EAL: RTE Version: 'DPDK 21.05.0-rc0'
Option -w, --pci-whitelist is deprecated, use -a, --allow option instead
Option -w, --pci-whitelist is deprecated, use -a, --allow option instead
EAL: Detected static linkage of DPDK
EAL: Multi-process socket /var/run/dpdk/rte/mp_socket
EAL: Selected IOVA mode 'VA'
EAL: Probing VFIO support...
EAL: VFIO support initialized
EAL: Probe PCI driver: mlx5_pci (15b3:101d) device: 0000:05:00.0 (socket 0)
mlx5_pci: txq_inline: deprecated parameter, converted to txq_inline_max
mlx5_pci: txq_inline: deprecated parameter, converted to txq_inline_max
mlx5_pci: Default miss action is not supported.
mlx5_pci: Unexpected error in counter offset support detection /* LINE INDICATING ERROR*/
EAL: Probe PCI driver: mlx5_pci (15b3:101d) device: 0000:05:00.1 (socket 0)
mlx5_pci: txq_inline: deprecated parameter, converted to txq_inline_max
mlx5_pci: txq_inline: deprecated parameter, converted to txq_inline_max
mlx5_pci: Default miss action is not supported.
mlx5_pci: Unexpected error in counter offset support detection /* LINE INDICATING ERROR*/
Interactive-mode selected
testpmd: create a new mbuf pool <mb_pool_0>: n=327680, size=2176, socket=0
testpmd: preferred mempool ops selected: ring_mp_mc
testpmd: create a new mbuf pool <mb_pool_1>: n=327680, size=2176, socket=1
testpmd: preferred mempool ops selected: ring_mp_mc
Configuring Port 0 (socket 0)
Port 0: 0C:42:A1:D1:D0:64
Configuring Port 1 (socket 0)
Port 1: 0C:42:A1:D1:D0:65
Checking link statuses...
Done
testpmd>

two lines indicates errors in counter offset supports detection.

[Fix]

the issue is fixed with the following upstream commit from v5.5-rc1 which cleanly applied above focal.
208d70f562e5 IB/mlx5: Support flow counters offset for bulk counters
Our QA-dpdk team tested the focal kernel with this patch and found no issues.

Thanks,
Amir