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fb4a5dfca0
If you try to create a 'mirror' ACL rule on a port that already has a
mirror rule, prestera_span_rule_add() will fail with EEXIST error.
This forces rollback procedure which destroys existing mirror rule on
hardware leaving it visible in linux.
Add an explicit check for EEXIST to prevent the deletion of the existing
rule but keep user seeing error message:
$ tc filter add dev sw1p1 ... skip_sw action mirred egress mirror dev sw1p2
$ tc filter add dev sw1p1 ... skip_sw action mirred egress mirror dev sw1p3
RTNETLINK answers: File exists
We have an error talking to the kernel
Fixes: 13defa275e ("net: marvell: prestera: Add matchall support")
Signed-off-by: Serhiy Boiko <serhiy.boiko@plvision.eu>
Signed-off-by: Maksym Glubokiy <maksym.glubokiy@plvision.eu>
Signed-off-by: David S. Miller <davem@davemloft.net>
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.