Public bug reported: This is a request to backport the following upstream commit which is present in v4.15.
commit 8db75d1e4001ac4cdfc73d5bedd0ec6d58a3d617 Author: Dustin Byford <dus...@cumulusnetworks.com> Date: Mon Dec 18 14:57:41 2017 -0800 ethtool: Support for FEC encoding control As FEC settings and different FEC modes are mandatory and configurable across various interfaces of 25G/50G/100G/40G, the lack of FEC encoding control and reporting today is a source for interoperability issues for many vendors set-fec/show-fec option(s) are designed to provide control and report the FEC encoding on the link. $ethtool --set-fec swp1 encoding [off | RS | BaseR | auto] Encoding: Types of encoding Off : Turning off FEC RS : Force RS-FEC encoding BaseR : Force BaseR encoding Auto : Default FEC settings for drivers, and would represent asking the hardware to essentially go into a best effort mode. Here are a few examples of what we would expect if encoding=auto: - if autoneg is on, we are expecting FEC to be negotiated as on or off as long as protocol supports it - if the hardware is capable of detecting the FEC encoding on it's receiver it will reconfigure its encoder to match - in absence of the above, the configuration would be set to IEEE defaults. >From our understanding, this is essentially what most hardware/driver combinations are doing today in the absence of a way for users to control the behavior. $ethtool --show-fec swp1 FEC parameters for swp1: FEC encodings: RS ethtool devname output: $ethtool swp1 Settings for swp1: root@hpe-7712-03:~# ethtool swp18 Settings for swp18: Supported ports: [ FIBRE ] Supported link modes: 40000baseCR4/Full 40000baseSR4/Full 40000baseLR4/Full 100000baseSR4/Full 100000baseCR4/Full 100000baseLR4_ER4/Full Supported pause frame use: No Supports auto-negotiation: Yes Supported FEC modes: [RS | BaseR | None | Not reported] Advertised link modes: Not reported Advertised pause frame use: No Advertised auto-negotiation: No Advertised FEC modes: [RS | BaseR | None | Not reported] Speed: 100000Mb/s Duplex: Full Port: FIBRE PHYAD: 106 Transceiver: internal Auto-negotiation: off Link detected: yes Signed-off-by: Vidya Sagar Ravipati <vidya.chowd...@gmail.com> Signed-off-by: Dustin Byford <dus...@cumulusnetworks.com> [code style + man page edits + commit message update] Signed-off-by: Dirk van der Merwe <dirk.vanderme...@netronome.com> Signed-off-by: John W. Linville <linvi...@tuxdriver.com> ** Affects: ethtool (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1749384 Title: Support for FEC encoding control To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ethtool/+bug/1749384/+subscriptions -- ubuntu-bugs mailing list firstname.lastname@example.org https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs