netdev - Re: PROBLEM: XGBE unable to autoneg when advertising only 1GbE KX mode

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Date:   Thu, 19 May 2022 14:28:42 +0000
From:   "Pighin, Anthony (Nokia - CA/Ottawa)" <anthony.pighin@...ia.com>
To:     "Pighin, Anthony (Nokia - CA/Ottawa)" <anthony.pighin@...ia.com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "thomas.lendacky@....com" <thomas.lendacky@....com>
Subject: Re: PROBLEM: XGBE unable to autoneg when advertising only 1GbE KX
 mode

Additional information:

I performed an asymmetric test. One side has 'ethtool -s bp3 advertise 0x20000' and the other side of the link has 'ethtool -s bp3 advertise 0xa0000' (ie. one side is advertising 1G only, the other is advertising 1G+10G). If I bring up the 1G-only side first, followed by the 1G+10G side, then the link properly comes up at 1G. However, if I do the reverse, and bring up the 1G+10G side first, followed by the 1G-only side, there is no link up. I need to bounce the 1G+10G side again (ip set link bp3 down/up) to get the link to come up.