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Maxim Mikityanskiy
840110a4ea
Currently, ethtool-netlink calculates new wanted bits as:
(req_wanted & req_mask) | (old_active & ~req_mask)
It completely discards the old wanted bits, so they are forgotten with
the next ethtool command. Sample steps to reproduce:
1. ethtool -k eth0
tx-tcp-segmentation: on # TSO is on from the beginning
2. ethtool -K eth0 tx off
tx-tcp-segmentation: off [not requested]
3. ethtool -k eth0
tx-tcp-segmentation: off [requested on]
4. ethtool -K eth0 rx off # Some change unrelated to TSO
5. ethtool -k eth0
tx-tcp-segmentation: off # "Wanted on" is forgotten
This commit fixes it by changing the formula to:
(req_wanted & req_mask) | (old_wanted & ~req_mask),
where old_active was replaced by old_wanted to account for the wanted
bits.
The shortcut condition for the case where nothing was changed now
compares wanted bitmasks, instead of wanted to active.
Fixes: 0980bfcd69 ("ethtool: set netdev features with FEATURES_SET request")
Signed-off-by: Maxim Mikityanskiy <maximmi@mellanox.com>
Reviewed-by: Michal Kubecek <mkubecek@suse.cz>
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.