[RFC PATCH wireless-next 00/17] wifi: add a driver for Broadcom BCM4323x USB adapters

[Ragul Balaji <ragulbaby@gmail.com>]

This series adds support for the following 802.11n USB adapters:
- Broadcom BCM43231 (Netgear WNA3100, Dynex DX-NUSB)
- BCM4323 (Netgear WNDA3100v2, Belkin F9L1101 and others)


The protocol was inferred from USB captures of the vendor's
Windows driver, cross referenced with code from brcmsmac, brcmfmac and b43.
The code which are copied almost as-is from the referenced drivers
are indicated in the comments of the code

The driver supports:

- station, P2P client and monitor interfaces
- HT20 and HT40, A-MPDU and A-MSDU transmission
- 2.4 GHz channels 1-14 and, on the BCM4323, 5 GHz channels 36-165
- hardware CCMP with management frame protection
- the LEDs and the WPS button

Power save, AP, P2P GO, IBSS and mesh interfaces and hardware
TKIP/WEP can be added in later patches

The series
----------

Patches 1-10 prepare brcm80211, so that the driver shares brcmsmac's
and brcmfmac's code instead of copying it:

- 1-2 make d11.h self-contained and move it, with the transmit frame
  ID masks, to the shared include directory;
- 3-4 prepare brcmsmac's rate tables and rateset helpers for brcmutil;
- 5 fixes brcmsmac's L-SIG length of short-GI frames, which could be
  one symbol shorter than the frame;
- 6-7 make the PLCP and frame timing helpers take the band instead
  of brcmsmac's state, and move them to rate.c;
- 8 moves rate.c, with all of these tables and helpers, to brcmutil;
- 9 moves brcmfmac's USB bootloader definitions to a shared header, as
  these adapters boot through the same bootloader.
- 10 exports ieee80211_get_bssid() from mac80211 again, reverting
  391234eb4831 ("wifi: mac80211: unexport ieee80211_get_bssid()")
Apart from patch 5, these patches change no behaviour; patch 6 only
drops the device name from the helpers' error messages. The brcmsmac
and brcmfmac changes are compile-tested only.

Patches 11-17 add the driver, with the Kconfig, Makefile and MAINTAINERS
entry coming last.

Firmware
--------

The driver requires brcm/bcm4323x.bin. As captured from the 5.100.68.46
version of the Windows driver.
sha256 cc286a529396434a38e59382dcd46fa92a57f1cd1a38eea20d2b24dec028cf29
This firmware needs to be in linux-firmware.

Testing
-------

On a Belkin F9L1101 associated to a 5 GHz HT40 WPA2 access point,
single-stream TCP ran at 107-128 Mbit/s in both directions.

AI USE
------
Reverse engineering is done with assistance from LLMs.
Code has been reviewed us manually.

Ragul Balaji (17):
  wifi: brcmsmac: make d11.h self-contained
  wifi: brcm80211: move d11.h to the shared include directory
  wifi: brcmsmac: look up OFDM rates in rate.c
  wifi: brcmsmac: give the rate tables and helpers a brcmu_ prefix
  wifi: brcmsmac: round short-GI L-SIG lengths up to whole symbols
  wifi: brcmsmac: pass the band to the PLCP and frame timing helpers
  wifi: brcmsmac: move the PLCP and frame timing helpers to rate.c
  wifi: brcm80211: move the rate helpers of brcmsmac to brcmutil
  wifi: brcm80211: move the USB bootloader definitions to a shared
    header
  wifi: mac80211: export ieee80211_get_bssid() again
  wifi: bcm4323x: add the shared definitions
  wifi: bcm4323x: add the USB transport and firmware setup
  wifi: bcm4323x: add the receive path
  wifi: bcm4323x: add the transmit path
  wifi: bcm4323x: add the mac80211 operations
  wifi: bcm4323x: add LED and WPS button support
  wifi: bcm4323x: add Kconfig, Makefile and MAINTAINERS entry

 MAINTAINERS                                   |    7 +
 .../net/wireless/broadcom/brcm80211/Kconfig   |    1 +
 .../net/wireless/broadcom/brcm80211/Makefile  |    1 +
 .../broadcom/brcm80211/bcm4323x/Kconfig       |   12 +
 .../broadcom/brcm80211/bcm4323x/Makefile      |    6 +
 .../broadcom/brcm80211/bcm4323x/bcm4323x.h    |  258 +++
 .../brcm80211/bcm4323x/bcm4323x_core.c        |  545 ++++++
 .../brcm80211/bcm4323x/bcm4323x_led.c         |  221 +++
 .../brcm80211/bcm4323x/bcm4323x_mac.c         | 1495 +++++++++++++++++
 .../broadcom/brcm80211/bcm4323x/bcm4323x_rx.c |  317 ++++
 .../broadcom/brcm80211/bcm4323x/bcm4323x_tx.c | 1386 +++++++++++++++
 .../broadcom/brcm80211/brcmfmac/usb.c         |   68 +-
 .../broadcom/brcm80211/brcmsmac/Makefile      |    1 -
 .../broadcom/brcm80211/brcmsmac/ampdu.c       |   34 +-
 .../broadcom/brcm80211/brcmsmac/dma.h         |   27 -
 .../broadcom/brcm80211/brcmsmac/mac80211_if.c |    2 +-
 .../broadcom/brcm80211/brcmsmac/main.c        |  687 ++------
 .../broadcom/brcm80211/brcmsmac/main.h        |   26 +-
 .../broadcom/brcm80211/brcmsmac/phy/phy_cmn.c |   17 -
 .../broadcom/brcm80211/brcmsmac/phy/phy_hal.h |    3 +-
 .../broadcom/brcm80211/brcmsmac/pub.h         |   35 +-
 .../broadcom/brcm80211/brcmsmac/rate.c        |  514 ------
 .../broadcom/brcm80211/brcmsmac/stf.c         |    4 +-
 .../broadcom/brcm80211/brcmutil/Makefile      |    2 +-
 .../broadcom/brcm80211/brcmutil/rate.c        | 1027 +++++++++++
 .../broadcom/brcm80211/include/brcm_usb_rdl.h |   77 +
 .../{brcmsmac/rate.h => include/brcmu_rate.h} |  160 +-
 .../brcm80211/{brcmsmac => include}/d11.h     |   43 +-
 include/net/mac80211.h                        |   12 +
 net/mac80211/ieee80211_i.h                    |    2 -
 net/mac80211/util.c                           |    1 +
 31 files changed, 5649 insertions(+), 1342 deletions(-)
 create mode 100644 drivers/net/wireless/broadcom/brcm80211/bcm4323x/Kconfig
 create mode 100644 drivers/net/wireless/broadcom/brcm80211/bcm4323x/Makefile
 create mode 100644 drivers/net/wireless/broadcom/brcm80211/bcm4323x/bcm4323x.h
 create mode 100644 drivers/net/wireless/broadcom/brcm80211/bcm4323x/bcm4323x_core.c
 create mode 100644 drivers/net/wireless/broadcom/brcm80211/bcm4323x/bcm4323x_led.c
 create mode 100644 drivers/net/wireless/broadcom/brcm80211/bcm4323x/bcm4323x_mac.c
 create mode 100644 drivers/net/wireless/broadcom/brcm80211/bcm4323x/bcm4323x_rx.c
 create mode 100644 drivers/net/wireless/broadcom/brcm80211/bcm4323x/bcm4323x_tx.c
 delete mode 100644 drivers/net/wireless/broadcom/brcm80211/brcmsmac/rate.c
 create mode 100644 drivers/net/wireless/broadcom/brcm80211/brcmutil/rate.c
 create mode 100644 drivers/net/wireless/broadcom/brcm80211/include/brcm_usb_rdl.h
 rename drivers/net/wireless/broadcom/brcm80211/{brcmsmac/rate.h => include/brcmu_rate.h} (53%)
 rename drivers/net/wireless/broadcom/brcm80211/{brcmsmac => include}/d11.h (97%)


base-commit: 734bef548a96e8774d6eef5dfa2026c6edc4e80b
-- 
2.53.0