On Tue, 2017-10-24 at 08:41 -0400, Michael J. Ruhl wrote:
> From: Michael J. Ruhl <michael.j.ruhl@xxxxxxxxx>
>
> rdma_nl_rcv_msg() checks to see if it should use the .dump() callback
> or the .doit() callback. The check is done with this check:
>
> if (flags & NLM_F_DUMP) ...
>
> The NLM_F_DUMP flag is two bits (NLM_F_ROOT | NLM_F_MATCH).
>
> When an RDMA_NL_LS message (response) is received, the bit used for
> indicating an error is the same bit as NLM_F_ROOT.
>
> NLM_F_ROOT == (0x100) == RDMA_NL_LS_F_ERR.
What are the remaining flags in the failing error case?
Or to be more specific,
>
> /* FIXME: Convert IWCM to properly handle doit callbacks */
> if ((nlh->nlmsg_flags & NLM_F_DUMP)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
This test is technically faulty. Since NLM_F_DUMP is a multi-bit flag,
it must be ((nlh->nlmsg_flags & NLM_F_DUMP) == NLM_F_DUMP) to be
technically correct. So, my question then becomes, if we correct this
test, will the RDMA_NL_LS_F_ERR return message still trigger this wrong
path? I'd rather have a technically correct fix to this if statement
than a special case of the index value if possible.
--
Doug Ledford <dledford@xxxxxxxxxx>
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