[ofa-general] Internal loopback for HCA (with no external cable required)

[Phillip Wilson]

Dotan, the ibv_rc_pingpong program supports internal loopback as you
stated.  I verified
this by removing the cable connected to the ports on the HCA (mthca0); this
HCA (mthca0)
was configured by the opensm program.  Even though the HCA (mthca0) ports
states
are "Down" and the Physical state are "Polling" for each port, the
ibv_rc_pingpong program
was able to perform internal loopback.

Thanks,
Phil

Is there an easy way to force the opensm to configure HCAs that are not
connected to
a (no cables connect to any other device or itself) fabric?  When I say
configure, I mean
assign a Base LID, LMC, and SM LID.

Otherwise, I will modify one of the management diagnostic such as smpquery
to set the
portinfo fields mention above.  Is this a good approach?


Internal Loopback perform on 'mthca0'

[root at hpdst165 ~]# ibstat
CA 'mthca0'
        CA type: MT23108
        Number of ports: 2
        Firmware version: 3.3.12
        Hardware version: a1
        Node GUID: 0x001635ffffbf0944
        System image GUID: 0x001635ffffbf0947
        Port 1:
                State: Down
                Physical state: Polling
                Rate: 10
                Base lid: 1
                LMC: 0
                SM lid: 1
                Capability mask: 0x02510a68
                Port GUID: 0x001635ffffbf0945
        Port 2:
                State: Down
                Physical state: Polling
                Rate: 10
                Base lid: 2
                LMC: 0
                SM lid: 1
                Capability mask: 0x02510a68
                Port GUID: 0x001635ffffbf0946
CA 'mthca1'
        CA type: MT23108
        Number of ports: 2
        Firmware version: 3.3.12
        Hardware version: a1
        Node GUID: 0x001635ffffbf1954
        System image GUID: 0x001635ffffbf1957
        Port 1:
                State: Down
                Physical state: Polling
                Rate: 2
                Base lid: 0
                LMC: 0
                SM lid: 0
                Capability mask: 0x02510a68
                Port GUID: 0x001635ffffbf1955
        Port 2:
                State: Down
                Physical state: Polling
                Rate: 2
                Base lid: 0
                LMC: 0
                SM lid: 0
                Capability mask: 0x02510a68
                Port GUID: 0x001635ffffbf1956


On 2/25/08, Dotan Barak <dotanb at dev.mellanox.co.il> wrote:
> Hi.
>
> please look bellow.
>
> Phillip Wilson wrote:
> > Internal loopback for HCA (with no external cable required)
> >
> >
> > <<Questions>>
> >
> > 1.) Is it possible to modify the ibv_rc_pingpong program for internal
loopback?
> >
> It supports internal loopback even today (if the daemon and client are
> being executed on the same host
> and they are using the same IB device + IB port).
> > 2.) If each mthca1 port is assigned a LID, can the ibv_rc_pingpong
> > program be used as is?
> >
> I think that the answer is yes. I didn't check that internal loopback is
> working if a LID is assigned
> to the IB port and the port state is down, but it should work.
>
>
>
> Dotan
>
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