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How to debug ath10k

Debug log messages

ath10k contains various debug log levels (check drivers/net/wireless/ath/ath10k/debug.h for up-to-date list):

enum ath10k_debug_mask {
        ATH10K_DBG_PCI          = 0x00000001,
        ATH10K_DBG_WMI          = 0x00000002,
        ATH10K_DBG_HTC          = 0x00000004,
        ATH10K_DBG_HTT          = 0x00000008,
        ATH10K_DBG_MAC          = 0x00000010,
        ATH10K_DBG_CORE         = 0x00000020,
        ATH10K_DBG_PCI_DUMP     = 0x00000040,
        ATH10K_DBG_HTT_DUMP     = 0x00000080,
        ATH10K_DBG_MGMT         = 0x00000100,
        ATH10K_DBG_DATA         = 0x00000200,
        ATH10K_DBG_ANY          = 0xffffffff,
};

The debug log levels can be enabled either with a module parameter named debug_mask or from sysfs. To get debug log messages enabled in the build enable CONFIG_ATH10K_DEBUG.

To enable debug logs with the module parameter:

# modprobe ath10k_core.ko debug_mask=0x16

Alternatively the debug logs can be enabled from sysfs anytime ath10k is running:

# echo 0x16 > /sys/module/ath10k_core/parameters/debug_mask

To check what is current debug_mask value:

$ cat /sys/module/ath10k_core/parameters/debug_mask
22

Note that the returned value is in decimal format, not hexadecimal.

debug_mask value is a bitwise OR operation of enum ath10k_debug_mask values above. For example, to enable HTC, WMI and MAC debug levels use python to calculate the value:

$ python -c "print '0x%x' % (0x2 | 0x4 | 0x10)"
0x16

Tracing

Enable tracing support with CONFIG_ATH10K_TRACING.

To trace all log messages, including debug logs, into trace.dat file:

trace-cmd record -e ath10k_log*

To trace everything possible from ath10k, mac80211 and cfg80211:

trace-cmd record -e mac80211 -e cfg80211 -e ath10k

To read the trace.dat file:

trace-cmd report

HTT statistics

The firmware provides various statistics for HTT (the data path in ath10k). There are different types of statistics available:

enum htt_dbg_stats_type {
        HTT_DBG_STATS_WAL_PDEV_TXRX = 0x01,
        HTT_DBG_STATS_RX_REORDER    = 0x02,
        HTT_DBG_STATS_RX_RATE_INFO  = 0x04,
        HTT_DBG_STATS_TX_PPDU_LOG   = 0x08,
        HTT_DBG_STATS_TX_RATE_INFO  = 0x10,
};

To enable statistics use bitwise OR operation to combine the values and write it htt_stats_mask. Here's an example which enables TX PPDU logs:

# echo 0x8 > /sys/kernel/debug/ieee80211/phy0/ath10k/htt_stats_mask

Not ath10k will query for those HTT statistics for every second. The stats are delivered to user space through trace events and trace-cmd is used to store the statistics:

sudo trace-cmd record -e ath10k_htt_stats

Firmware version

Firmware version can be retrieved with ethtool:

$ sudo ethtool -i wlan1
driver: ath10k_pci
version: 3.12.0-rc3-wl+
firmware-version: 1.0.0.636
bus-info: 0000:02:00.0