I've got a bug report for someone using a Intel OPA devices in a bond, and it appears these devices have a hardware address length of 20, opposed to the typical 6 on ethernet. When they dump /proc/net/bonding/bondX, it only prints the first 6 of the address, per %pM and mac_address_string(), while sysfs for the interface does print the right thing, since it uses sysfs_print_mac(), which takes a length argument.
So the question is... What's the best route to take here? Expand %pM to support variable length hardware addresses? Use sysfs_* in procfs? Reinvent the wheel? Nothing I've tinkered with just yet feels very clean, on top of not actually working yet. :)
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Jarod Wilson
jarod@redhat.com