How to disable PCIE Relaxed Ordering?

Solution Verified - Updated -

Issue

  • Some of devices show RlxdOrd+ bit set in lspci output, how can it be disabled or unset?
d8:00.0 Ethernet controller [0200]: Mellanox Technologies MT27700 Family [ConnectX-4] [15b3:1013]
        Subsystem: Hewlett Packard Enterprise Device [1590:00c8]
        Capabilities: [60] Express (v2) Endpoint, MSI 00
                DevCap: MaxPayload 512 bytes, PhantFunc 0, Latency L0s unlimited, L1 unlimited
                        ExtTag+ AttnBtn- AttnInd- PwrInd- RBE+ FLReset+ SlotPowerLimit 75.000W
                DevCtl: Report errors: Correctable- Non-Fatal+ Fatal+ Unsupported-
                        RlxdOrd+ ExtTag+ PhantFunc- AuxPwr- NoSnoop+ FLReset-    <----- RlxdOrd+ is set
                        MaxPayload 256 bytes, MaxReadReq 4096 bytes

Environment

  • Red Hat Enterprise Linux.

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