The short answer is that we needed to turn it off by default because of
interoperability issues with switches that were pre-standards, and you can turn
it back on using ethtool.
There were two ways we could fix this: ask the people with the switches to
upgrade their switch firmware, or turn off default advertisements for 2.5G and
5G. The customers with the switches objected vehemently to having to touch all
their switches, and there were a lot of customers complaining. This is the
first time I've heard of anyone asking for 2.5G or 5G outside of the telecom
space, so we went with the option of changing the default.
Check the ethtool man page for more information, but there's a bitmask of
speeds and modes under ethtool -s that you need to set.
Todd Fujinaka
Software Application Engineer
Data Center Group
Intel Corporation
todd.fujin...@intel.com
-----Original Message-----
From: Philipp Wollermann <philipp.wollerm...@gmail.com>
Sent: Thursday, September 10, 2020 1:30 PM
To: e1000-devel@lists.sourceforge.net
Subject: [E1000-devel] ixgbe 5.8.1 dropped support for NBase-T in X550
Hi,
after upgrading from ixgbe 5.7.1 to 5.8.1, my X550-T2 NICs can no longer
auto-negotiate a link with 2.5Gb/s or 5GB/s.
I diffed the code and noticed that in src/ixgbe_phy.c the following lines were
removed:
case ixgbe_mac_X550:
hw->phy.speeds_supported |= IXGBE_LINK_SPEED_2_5GB_FULL;
hw->phy.speeds_supported |= IXGBE_LINK_SPEED_5GB_FULL;
break;
Indeed, when reverting just this change, ixgbe 5.8.1 successfully brings up
links with 2.5Gb/s and 5 Gb/s again.
As the change has not been mentioned in the release notes as an intentional
feature removal, I wonder if it's an accidental regression?
Kind regards,
Philipp
--
Philipp Wollermann | Software Engineer | phi...@google.com Google Germany GmbH
| Erika-Mann-Straße 33 | 80636 München
Geschäftsführer: Paul Manicle, Halimah DeLaine Prado Registergericht und
-nummer: Hamburg, HRB 86891 Sitz der Gesellschaft: Hamburg
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