Bug 2137619

Summary: [RFE] Add support for HTB QoS with rate higher than 34 Gbps
Product: Red Hat Enterprise Linux Fast Datapath Reporter: Ilya Maximets <i.maximets>
Component: openvswitch3.0Assignee: Adrián Moreno <amorenoz>
Status: POST --- QA Contact: liting <tli>
Severity: medium Docs Contact:
Priority: unspecified    
Version: FDP 22.LCC: ctrautma, echaudro, jhsiao, ralongi
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Description Ilya Maximets 2022-10-25 15:56:44 UTC 
The basic tc-htb interface is limited to 32bit rate values due to the
'struct tc_ratespec'.  The value is in bytes per second, so the user
is not able to specify rates higher than 34.359.738.360 bps, which is
roughly 34 Gbps.

Modern NICs are capable of much higher speeds.  The extension to the
API was added in kernel 3.13 that included 2 new netlink attributes:
TCA_HTB_RATE64 and TCA_HTB_CEIL64, which are 64bit values that can be
used to break the 32bit barrier.

OVS so far didn't adopt the use of these attributes, so it doesn't
support QoS at high speeds.

Implementation in iproute2:
  https://github.com/shemminger/iproute2/commit/8334bb325d5178483a3063c5f06858b46d993dc7