[dpdk-dev] Testpmd parameter --enable-lro fails on Mellanox ConnectX5

[Georgios Katsikas <katsikas.gp@gmail.com>]

Hi all,

In the latest features of the MLX5 PMD (i.e., DPDK 19.08), there is LRO
hardware support.
However, I cannot make it work with our dual port 100GbE Mellanox ConnectX5
(MT27800) card.

Let me first describe the configuration of my testbed: First,I upgraded
OFED to the latest 4.7-1.0.0 with firmware version 16.26.1040
(MT_0000000008) and installed the latest MFT (4.13) to enable DevX
according to the instructions here
<https://doc.dpdk.org/guides/nics/mlx5.html>:

mlxconfig -d <device> set UCTX_EN=1

My OS is Ubuntu server 18.04 with kernel 4.15.0-65-generic. I also tested
on another server with the same distro but more recent kernel (5.15),
without any luck.

To test LRO, I simply use testpmd as follows:

sudo ./testpmd -l 0-15 -w 0000:03:00.1 -v -- --txq=16 --rxq=16
--nb-cores=15 --enable-lro -i

Th output I get is:

Configuring Port 0 (socket 0)
net_mlx5: Failed to create RQ using DevX
net_mlx5: port 0 Rx queue 8 RQ creation failure
net_mlx5: port 0 Rx queue allocation failed: Cannot allocate memory
Fail to start port 0
Please stop the ports first
Done

Reducing the number of queues does not solve the problem. Specifically, if
I ask for 1 rX and 1 Tx queue, testpmd  fails without an error from the mlx
driver:

Configuring Port 0 (socket 0)
Fail to start port 0
Please stop the ports first
Done

I would appreciate your help on this issue.

Best regards,
Georgios