Android Linux kernel - v5.4

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===

Android 的 Linux kernel 會選用 Long-term stable kernels.
也就是所謂的 LTS version Linux kernel.

目前 LTS kernel :

    v4.4.x

    v.4.9.x

    v.4.14.x

    v4.19.x


https://en.wikipedia.org/wiki/Linux_kernel_version_history

5.4

24 November 2019[220]

5.4.34[221]

Greg Kroah-Hartman & Sasha Levin[69]

20th LTS release, maintained from November 2019 to December 2021[69]

目前 Android kernel source 上已經有 Linux kernel v5.4
https://android.googlesource.com/kernel/common/+/refs/heads/android-5.4


而在 kernel 的 release notes, 可以看到修改的部分.
針對 wireless 修改, 從 v4.14 到 v5.4 整理如下.

像 WPA3 會用到的 NL80211_CMD_EXTERNAL_AUTH 是從 v4.17 開始支援
而像 wifi6 11ax 的部分, 從 4.19 開始, 陸陸續續新增進來 Linux kernel

===

5.4
Wireless

• Association timestamp recording commit, commit
• Add cfg80211 support for 6 GHz band, proposed in standard 802.11ax D4.0 commit, commit, commit, commit, commit, commit, commit, commit
• Add HE TX rate reporting to radiotap commit, commit, commit
• Add ADDBA_EXT responder support commit, commit
• HE mesh support commit, commit
• Add support for new channels on 60 GHz band and EDMG channel commit, commit

--
5.0

Wireless

• Add support to notify radar event info received from STA commit
• Let userspace learn about iftype changes by sending a notification when handling the NL80211_CMD_SET_INTERFACE command commit
• Announce radios/interfaces when switching namespaces, so userspace can rely on these events to discover radios properly commit
• Add a new "peer measurement" API, that can be used to measure certain things related to a peer. Right now, only implement FTM (flight time measurement) over it, but the idea is that it'll be extensible to also support measuring the necessary things to calculate e.g. angle-of-arrival for WiGig commit, commit
• mac80211_hwsim: allow configurable cipher types commit, allow setting iftype support commit
• mesh: advertise gates in mesh formation commit, commit, commit
• rtnetlink wifi simulation device commit

--

4.20

• Wireless
• Add support for 60GHz band channels 5 and 6 commit
• Allow userspace to enable FTM responder functionality with the addition of new Netlink flag attribute NL80211_ATTR_FTM_RESPONDER with configurable lci/civic ocation parameters commit, commit
• VHT extended NSS support commit, commit, commit, commit
• Add per peer statistics to compute FCS error rate commit
• Add he_capa debugfs entry commit

--

4.19

1.3. Preliminary Wi-Fi 6 (802.11ax) support

This release adds preliminary support in the wireless stack for the existing drafts of the future 802.11ax standard, also known as Wi-Fi 6.

Code: commit 1, 2, 3, 4

--

4.18

• Wireless (802.11)
• Export TXQ parameters and statistics via nl80211 commit, commit
• Introduces the average ack rssi for data frames commit, commit
• nl80211: support offloading FILS-SK roaming scenarios commit, commit, commit
• Add wmm rule attribute to NL80211_CMD_GET_WIPHY dump command commit

--

4.17

Wireless

• Support offloading wireless authentication to userspace via NL80211_CMD_EXTERNAL_AUTH commit, commit, commit
• Add support for running 802.11 authentication mechanisms (e.g. 802.1X, 4-Way Handshake, etc) over NL80211 instead of putting them onto the network device commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit
• Allow AP_VLAN operation on crypto controlled devices commit
• Add txq flags to debugfs commit
• Support reporting A-MPDU EOF bit value/known commit
• Add support to notify station's opmode change to userspace commit, commit

--

4.15

• 802.11 (wireless)
• Add an event that indicates that a connection is authorized commit
• in-kernel regulatory database commit, commit, commit, commit
• nl80211: add Optimized Connectivity Experience (OCE) scan and capability flags commit, commit
• nl80211: add an option to allow MFP without requiring it commit