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b42e21d097
[ Upstream commit 03d120f27d050336f7e7d21879891542c4741f81 ]
CPSW ALE has 75-bit ALE entries stored across three 32-bit words.
The cpsw_ale_get_field() and cpsw_ale_set_field() functions support
ALE field entries spanning up to two words at the most.
The cpsw_ale_get_field() and cpsw_ale_set_field() functions work as
expected when ALE field spanned across word1 and word2, but fails when
ALE field spanned across word2 and word3.
For example, while reading the ALE field spanned across word2 and word3
(i.e. bits 62 to 64), the word3 data shifted to an incorrect position
due to the index becoming zero while flipping.
The same issue occurred when setting an ALE entry.
This issue has not been seen in practice but will be an issue in the future
if the driver supports accessing ALE fields spanning word2 and word3
Fix the methods to handle getting/setting fields spanning up to two words.
Fixes: b685f1a58956 ("net: ethernet: ti: cpsw_ale: Fix cpsw_ale_get_field()/cpsw_ale_set_field()")
Signed-off-by: Sudheer Kumar Doredla <s-doredla@ti.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Reviewed-by: Roger Quadros <rogerq@kernel.org>
Reviewed-by: Siddharth Vadapalli <s-vadapalli@ti.com>
Link: https://patch.msgid.link/20250108172433.311694-1-s-doredla@ti.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
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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.