This Channel Frequency Response feature is to get the channel
state information from the hardware and send the CSI data to
userspace.
CFR dumps will be collected from the received ACK's for the
transmited QOS NULL frames for the associated stations. For
unassociated stations CFR dumps will be collected from the
probe response ACK.
CFR format to user space:
___________________________________________
| CFR header | CFR payload | CFR tail data |
|____________|_____________|_______________|
CFR header contains the following fields,
* Start magic number 0xDEADBEAF - 4bytes
* vendor id - 4bytes
* cfr metadata version - 1byte
* cfr data version - 1byte
* chip type - 1byte
* platform type - 1byte
* CFR metadata length - 4bytes
* metadata - 92bytes
peer mac - 6bytes
capture status - 1byte (1 for success 0 for failure)
capture_bw - 1byte
channel_bw - 1byte
phy_mode - 1byte
prim20_chan - 2bytes
center_freq1 - 2bytes
center_freq2 - 2bytes
capture_mode - 1byte
capture_type - 1byte
sts_count - 1byte
num_rx_chain - 1byte
timestamp - 4bytes
length - 4bytes
chain_rssi - 32bytes (4bytes for each chain)
chain_phase - 16bytes (2bytes for each chain)
cfo_measurement - 4bytes
agc_gain - 8bytes (1 bytes for each chain)
rx_start_ts - 4bytes
CFR payload:
CFR payload contains 8bytes of ucode header followed by the
tone information. Tone order is positive tones, followed by
PHY memory garbage, followed by negative tones. Dummy tones
are uploaded to make number of tones always integer number
of 64. Number of tones is not preamble type dependent.
Each CFR tone has 14-bit I component and 14-bit Q component
and is sign extended to 16-bit I/Q. Two tones are packed
into one 64-bit unit as:
[63:0] = [Tone1_Q(63:48) Tone1_I(47:32) Tone0_Q(31:16) Tone0_I(15:0)]
CFR tail: end magic number 0xBEAFDEAD
Tested-on: IPQ8074 WLAN.HK.2.5.0.1-00991-QCAHKSWPL_SILICONZ-1
Venkateswara Naralasetty (6):
nl80211: vendor-cmd: qca: add command for CFR configuration
ath11k: CFR module initialization and deinitialization for IPQ8074
ath11k: register relayfs entries for CFR dump
ath11k: register vendor sub command for CFR configuration
ath11k: Register DBR event handler for CFR data
ath11k: Register handler for CFR capture event
drivers/net/wireless/ath/ath11k/Kconfig | 9 +
drivers/net/wireless/ath/ath11k/Makefile | 4 +-
drivers/net/wireless/ath/ath11k/cfr.c | 816 +++++++++++++++++++++++++++++++
drivers/net/wireless/ath/ath11k/cfr.h | 304 ++++++++++++
drivers/net/wireless/ath/ath11k/core.c | 35 ++
drivers/net/wireless/ath/ath11k/core.h | 17 +
drivers/net/wireless/ath/ath11k/dbring.c | 33 +-
drivers/net/wireless/ath/ath11k/dbring.h | 7 +
drivers/net/wireless/ath/ath11k/debug.h | 2 +
drivers/net/wireless/ath/ath11k/hal.c | 3 +-
drivers/net/wireless/ath/ath11k/hw.h | 5 +
drivers/net/wireless/ath/ath11k/mac.c | 18 +-
drivers/net/wireless/ath/ath11k/vendor.c | 192 ++++++++
drivers/net/wireless/ath/ath11k/vendor.h | 13 +
drivers/net/wireless/ath/ath11k/wmi.c | 148 +++++-
drivers/net/wireless/ath/ath11k/wmi.h | 97 +++-
include/uapi/linux/nl80211-vnd-qca.h | 104 ++++
17 files changed, 1791 insertions(+), 16 deletions(-)
create mode 100644 drivers/net/wireless/ath/ath11k/cfr.c
create mode 100644 drivers/net/wireless/ath/ath11k/cfr.h
create mode 100644 drivers/net/wireless/ath/ath11k/vendor.c
create mode 100644 drivers/net/wireless/ath/ath11k/vendor.h
create mode 100644 include/uapi/linux/nl80211-vnd-qca.h
--
2.7.4