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    SubjectRe: [PATCH][RFC/v1][11/12] Add InfiniBand Documentation files
        Christoph> Any reason this doesn't use an interface similar to the
    Christoph> normal vlan code?

    The normal vlan code uses an ioctl(). I thought a simple sysfs
    interface would be more palatable than a new socket ioctl.

    Christoph> And what is a P_Key?

    It is a 16-bit identifier carried by IB packets that says which
    partition the packet is in. End ports have P_Key tables that list
    which partitions they are members of (a port can be a member of one or
    more partitions, and can only receive packets from that partition).

    - Roland
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