I am writing packet generation/analysis software using the ConnectX-4 (mlx5) DPDK driver.
With all other NICs I have tried (including ConnectX-3) when only a single queue on an interface is used
all packets are usually received in the order they are sent regardless of changing IP/MAC addresses
because RSS is not being used.
Is the ConnectX-4 doing RX flow classification/analysis all the time which would cause this?
Is there a way to turn it off?
I am using DPDK 16.11 with Mellanox 4.0-126.96.36.199 kernel drivers w/ linux 4.4 kernel in a VM running on QEMU/KVM w/ PCI passthru.
Board ID: MT_2150110033
Attached is a simple program which reproduces the issue.
See the readme.txt file in the .tgz file for additional details and description of program.
I thought the issue might be caused by the WQ indirection in the DPDK driver so I modified the
DPDK mlx5 driver code to use a QP directly, but there are still out of order packet issues.
Any idea why this is occurring?
mlx-ooo-test.tgz (20 KB)