[Users] ipoib to lid

[Michael Di Domenico]

Hal,

thanks, I came to the same conclusion.  I was hoping there was a
command that I could feed in the ipoib address and then dump out at a
very minimum the destination lid.  though it would be nice if it could
dump out more info.

On Wed, May 17, 2017 at 1:22 PM, Hal Rosenstock
<hal.rosenstock at gmail.com> wrote:
> It's not a single command.
>
> IPoIB link layer address is comprised of QPN + GID not LID.
>
> Assuming IPoIB subnet does not span IB subnets, then the process to obtain
> the LID is as follows:
>
> Ensure remote IP address is in ARP cache
>
> Use GUID or GID for remote IP to perform SA query
>
> So in Linux, if IPoIB is on netdev ib0 and local IPoIB address on that
> interface is 192.168.0.20, and we are interested in 192.168.0.17,
>
> ip neighbor show dev ib0
>
> If remote IP doesn't show up there, do:
>
> ping 192.168.0.17
>
> then neighbors will show:
> 192.168.0.17 lladdr
> 80:00:00:68:fe:80:00:00:00:00:00:00:24:8a:07:03:00:8f:9f:9c REACHABLE
>
> GID starts with fe:80
> GUID is last 8 bytes (24:8a:07:03:00:8f:9f:9c or 0x248a0703008f9f9c
>
> This can be used to query SA in many ways (saquery or smpquery with -G
> option).
>
> So for example,
> smpquery pi -G 0x248a0703008f9f9c 1
> # Port info: Lid 5 port 1
> Mkey:............................<not displayed>
> GidPrefix:.......................0xfe80000000000000
> Lid:.............................5
> SMLid:...........................41
>
> That can be double checked as follows:
>
> smpquery ni 5
> # Node info: Lid 5
> BaseVers:........................1
> ClassVers:.......................1
> NodeType:........................Channel Adapter
> NumPorts:........................1
> SystemGuid:......................0x248a0703008f9f9c
> Guid:............................0x248a0703008f9f9c
> PortGuid:........................0x248a0703008f9f9c
>
> This could also be done with saquery PR but the GIDs need to be put into
> IPv6 format.
>
> -- Hal
>
>
> On Wed, May 17, 2017 at 12:45 PM, Michael Di Domenico
> <mdidomenico4 at gmail.com> wrote:
>>
>> is there any command included with openib that would give me a remote
>> lid given it's ipoib address?
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>