[ewg] Can't snoop all kinds of mad packets

[Yunzhao li]

We are working on the newest IB card: Mellanox Connect-IB. We pulled
Mellanox OFED-2.1 into our environment. The IB nodes are connected through
Mellanox SX3036 switch. We exactly followed Sean Hefty's madeye code: using
ib_register_mad_snoop() for registration and using ib_mad_snoop_handler()
and ib_mad_recv_handler() to handle the sent and received MAD packets
respectively. However, the most captured SM packets are DevMgt (0x06), and
we haven't received any class 0x81 or class 0x01 MADs.

Does the snooping mad routine need the support of HCA hardware/firmware?
Or, does it need the support of ibdump package?

Thanks!


On Mon, Apr 7, 2014 at 7:50 PM, Hal Rosenstock <hal at dev.mellanox.co.il>wrote:

>
> > We try to use IB MAD snoop to capture IB mad packets.
>
> Note that there is old kernel util module madeye written by Sean which
> does this:
>
>
> http://git.openfabrics.org/?p=ofed_1_5/linux-2.6.git;a=blob;f=drivers/infiniband/util/madeye.c;h=2c650a33a69c56d2b8a3274f63185214904abf3a;hb=967460824529719677d6a1d4600ec3e89a4538ab
>
> which shows how to properly use the ib_register_mad_snoop API for both
> SM and GS class MAD snooping.
>
> > However, currently
> > only the classes of DevMgt (0x06) and ComMgt (0x07) could be snooped. We
> > tried to run tests based on class Perf (0x04) and class Subn (0x01) mad,
> > and neither of them can be captured. Any suggestion?
>
> In the distant past, I've used madeye and captured SM, SA, and PerfMgt
> packets.
>
> Assuming your snoop registration(s) is/are correct:
> Most SM packets are class 0x81 (directed route) and not class 0x01 (LID
> routed) but this is SM dependent. Also, it might be that there is no
> PerfMgt running to/from your node.
>
> -- Hal
>
> >
> >
> > Thanks in advance!
> >
> >
> >
> > Yunzhao
>
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