Comment 28 for bug 1874056
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| bugproxy (bugproxy) wrote Comment bridged from LTC Bugzilla | #28 |
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------- Comment From <email address hidden> 2020-05-19 05:21 EDT-------
Technical issue:
Mellanox CX5 port multi-pathing is broken on s390x due to non-standard topology of PCI IDs (phys. and virtual)
Details
The Mellanox ConnectX5 Linux PCI driver (mlx5) implements a multi-path feature that can be used to combine multiple networking ports to improve performance and reliability. For that purpose, the mlx5 driver combines PCI functions based on topology information (the function number) as determined from their PCI ID.
Currently the Linux on Z PCI bus does not reflect PCI topology information in the PCI ID. As a result, the mlx5 multi-path function cannot be activated.