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If you have a patched up dhcp server (and dhclient), they will use AF_PACKET/SOCK_DGRAM pair to send dhcp packets over IPoIB. However, when testing an upstream kernel, this has been broken for a very long time (I tested 2.6.34, 2.6.38, 3.0, 3.1, 3.8, HEAD). It turns out that the hard_header routine in ipoib is not following the API and is returning 0 even when it pushed data onto the skb. This then causes af_packet.c to overwrite the header just pushed with data from user space. Fixing this gets DHCP working on IPoIB. Signed-off-by: Doug Ledford <dledford@redhat.com> Signed-off-by: Roland Dreier <roland@purestorage.com> |
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