[openib-general] Unicast ARP

[Roland Dreier]

    Michael> Currently it also seems that by just bringing the
    Michael> interface up and down the hw address will change.  Unless
    Michael> I am doing something wrong, this inconvenience seems to
    Michael> be caused by a different QP number being assigned.  Cant
    Michael> this be solved e.g. by assigning a fixed QP number for IP
    Michael> over IB?

It seems you are doing something wrong.  The QP is allocated when the
interface is created and remains the same when the interface is
brought up and down:

    # ip addr show dev ib0
    7: ib0: <BROADCAST,MULTICAST,UP> mtu 2044 qdisc pfifo_fast qlen 128
        link/[32] 00:02:04:04:fe:80:00:00:00:00:00:00:00:05:ad:00:00:01:82:06 brd 00:ff:ff:ff:ff:12:40:1b:ff:ff:00:00:00:00:00:00:ff:ff:ff:ff
    # ifconfig ib0 down
    # ifconfig ib0 up
    # ip addr show dev ib0
    7: ib0: <BROADCAST,MULTICAST,UP> mtu 2044 qdisc pfifo_fast qlen 128
        link/[32] 00:02:04:04:fe:80:00:00:00:00:00:00:00:05:ad:00:00:01:82:06 brd 00:ff:ff:ff:ff:12:40:1b:ff:ff:00:00:00:00:00:00:ff:ff:ff:ff

 - Roland