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21c3f8f955
The new Wi-Fi Standard (IEEE Std 802.11-2020 9.4.2.160) specifies that the Wide Bandwidth Channel Switch (WBCS) Element subfields have the same definitions as VHT operation information if the operating band is not S1G. The problem comes when the BSS is in 6 GHz band, the STA parses the WBCS Element by ieee80211_chandef_vht_oper(), which checks the capabilities for HT/VHT mode, not HE/EHT mode. This patch refactors STA CSA parsing flow so that the corresponding capabilities can be checked. Also, it adds the way to use op_class in ECSA Element to build a new chandef. In summary, the new steps for STA to handle CSA event are: 1. build the new chandef from one of the CSA-related (Sub)Elements in following order, - Bandwidth Indication (Sub)Element - Wide Bandwidth Channel Switch (Sub)Element - Operating class in Extended Channel Switch Announcement Element - Channel Switch Announcement Element 2. convert the new chandef into operation information according to the operating band in order to check if the new chandef fits STA's capabilities. 3. downgrade the bandwidth until current bandwidth is not disabled. Co-developed-by: Money Wang <money.wang@mediatek.com> Signed-off-by: Michael-CY Lee <michael-cy.lee@mediatek.com> Link: https://msgid.link/20231222010914.6521-3-michael-cy.lee@mediatek.com [rebase on top of the changes with struct ieee80211_conn_settings, prefer leXY_encode_bits()] Signed-off-by: Johannes Berg <johannes.berg@intel.com> |
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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.