Re: [E1000-devel] ixgbe Linux V. 5.9.4

[Fujinaka, T. <tod...@in...>]

We won't be accepting this patch for the following reasons:

The default has been changed but you will be able to enable those speeds using ethtool now.
The default of 2.5G and 5G are OFF because of interoperability issues with certain 10G switches that are confused by 2.5G and 5G and negotiate down to 1G.

The README is still in error and says ethtool can't change the advertisement of 2.5G and 5G, but that should be fixed in the next version. You should be able to just use ethtool with the mask shown in the man page.

We did consider your case of users with 2.5G and 5G networks, but the throttling of 10G to 1G was seen as a much larger issue which we saw repeatedly in large data centers.

Thanks.

Todd Fujinaka
Software Application Engineer
Data Center Group
Intel Corporation
tod...@in...

-----Original Message-----
From: Dave Bailey <dsb...@pa...> 
Sent: Wednesday, November 11, 2020 4:48 PM
To: e10...@li...
Subject: [E1000-devel] ixgbe Linux V. 5.9.4

this version added support for 2.5 Gbps and 5 Gbps auto-negotiation

for adapters X550 and later. however, for switches that support

these speeds (and so advertise) but /do not/ advertise those modes

(e.g. Netgear MS-510TX), the changes don't' suffice, and the

adapter reverts to 1 Gb/s speed. I enclose a simple change to

the *ixgbe_setup_phy_link_speed_generic* function that fixes the issue.

Note that the Windows drivers support these speeds out of the box.