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[ Upstream commitecacb3751f] When filling a cm_id entry, return "-EAGAIN" instead of 0 if the cm_id doesn'the have the same port as requested, otherwise an incomplete entry may be returned, which causes "rdam res show cm_id" to return an error. For example on a machine with two rdma devices with "rping -C 1 -v -s" running background, the "rdma" command fails: $ rdma -V rdma utility, iproute2-5.19.0 $ rdma res show cm_id link mlx5_0/- cm-idn 0 state LISTEN ps TCP pid 28056 comm rping src-addr 0.0.0.0:7174 error: Protocol not available While with this fix it succeeds: $ rdma res show cm_id link mlx5_0/- cm-idn 0 state LISTEN ps TCP pid 26395 comm rping src-addr 0.0.0.0:7174 link mlx5_1/- cm-idn 0 state LISTEN ps TCP pid 26395 comm rping src-addr 0.0.0.0:7174 Fixes:00313983cd("RDMA/nldev: provide detailed CM_ID information") Signed-off-by: Mark Zhang <markzhang@nvidia.com> Link: https://lore.kernel.org/r/a08e898cdac5e28428eb749a99d9d981571b8ea7.1667810736.git.leonro@nvidia.com Signed-off-by: Leon Romanovsky <leon@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.