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The ixgbe driver did not support the 1000BASE-BX standard so for example FS.com
SFP-GE-BX 1310/1490nm 10km transceiver received an unsupported module error even
with allow_unsupported_sfp enabled.
To solve this problem I created a patch that was accepted by Linux upstream
(https://github.com/torvalds/linux/commit/1b43e0d20f2d007ec4c124b0deaa848ff8d61f4a)
so starting from kernel 6.9 the ixgbe driver will have 1000BASE-BX support,
however VyOS uses the out of tree driver so it is necessary to backport the patch.
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In-tree vs. Out-Of-Tree drivers differ in the way how unsupported transceivers
are defined (uint vs array of int) for the Kernel module parameters.
This results in:
kernel: ixgbe 0000:5e:00.0: failed to initialize because an unsupported SFP+ module type was detected.
kernel: ixgbe 0000:5e:00.0: Reload the driver after installing a supported module.
kernel: ixgbe 0000:5e:00.0: removed PHC on eth6
This patch always enables unsupported SFP+ modules as wo do anyway from
the userspace but only for the first port.
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This fixes commit 0f80a22b5 ("T5619: Add out-of-tree Intel ixgbe driver") to
work with the latest 6.6 code base.
For more information see
https://lore.kernel.org/lkml/f90837d0-810e-5772-7841-28d47c44d260@intel.com
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