[ewg] IPv6 over Ethernet (RoCE) is broken

Jie Yang frank.yangjie at gmail.com
Tue Aug 20 21:19:07 PDT 2013


Hi,

    I have installed the latest OFED-3.5-2 daily software on SLES 11.2
x86-64 with Mellanox Technologies MT26428 [ConnectX VPI. PCIe 2.0 5GT/s -
IB QDR / 10GigE].
   When MT26428 is in IB mode, all works fine. But when it switches into
the ethernet mode becoming a RoCE card, some error comes out. If the server
application program uses rdma cm APIs (rdma_bind and rdma_listen) listening
on IPv6 address like "::", it will refuse the connection launched by
rdma_connect. The errno is set to be ECONNREFUSED. However, if server
listens on IPv4 address like "0.0.0.0" or "0", the connection is
successful.
   I've found some patch:
   http://comments.gmane.org/gmane.linux.drivers.rdma/16448
   But I'm not sure whether it's relevant to the issue I experienced above.
 Has any one seen this bug ?

Frank
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