netdev - Re: [PATCH net] Revert "ixgbe: Manual AN-37 for troublesome link partners for X550 SFI"

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Date: Thu, 23 May 2024 13:35:08 -0700
From: Jacob Keller <jacob.e.keller@...el.com>
To: <kernel.org-fo5k2w@...arbi.fr>, Jeff Daly <jeffd@...icom-usa.com>, "Simon
 Horman" <horms@...nel.org>
CC: <netdev@...r.kernel.org>
Subject: Re: [PATCH net] Revert "ixgbe: Manual AN-37 for troublesome link
 partners for X550 SFI"



On 5/23/2024 1:19 PM, kernel.org-fo5k2w@...arbi.fr wrote:
>> One more thing: Could you confirm if this behavior appears in the 5.19.9
>> driver from the Intel website or source forge? I'm curious if this is a
>> case of a fix that never got published to the netdev community.
>>
>> Thanks,
>> Jake
> 
> I can confirm that the result of the “Supported link modes:” section is identical with the Intel ixgbe-5.19.9 driver:
> uname -r
> 5.10.0-29-amd64
> 
> apt install linux-headers-$(uname -r) gcc make
> wget https://downloadmirror.intel.com/812532/ixgbe-5.19.9.tar.gz
> tar xf ixgbe-5.19.9.tar.gz -C /usr/local/src/
> make -j 8
> 
> modinfo ./ixgbe.ko
> rmmod ixgbe
> modprobe dca
> insmod ./ixgbe.ko
> 
> # eno1 is up
> ethtool eno1
> Settings for eno1:
> 	Supported ports: [ FIBRE ]
> 	Supported link modes:   10000baseT/Full
> 	Supported pause frame use: Symmetric
> 	Supports auto-negotiation: No
> 	Supported FEC modes: Not reported
> 	Advertised link modes:  10000baseT/Full
> 	Advertised pause frame use: Symmetric
> 	Advertised auto-negotiation: No
> 	Advertised FEC modes: Not reported
> 	Speed: 10000Mb/s
> 	Duplex: Full
> 	Auto-negotiation: off
> 	Port: Direct Attach Copper
> 	PHYAD: 0
> 	Transceiver: internal
> 	Supports Wake-on: d
> 	Wake-on: d
>         Current message level: 0x00000007 (7)
>                                drv probe link
> 	Link detected: yes

Thanks. At a glance from reviewing code, it looks like ixgbe simply
collapses all non-backplane links into 10000baseT/Full.