ice: add ability to read and configure FW log data

Once logging is enabled the user should read the data from the 'data'
file. The data is in the form of a binary blob that can be sent to Intel
for decoding. To read the data use a command like:

  # cat /sys/kernel/debug/ice/0000\:18\:00.0/fwlog/data > log_data.bin

If the user wants to clear the FW log data that has been stored in the
driver then they can write any value to the 'data' file and that will clear
the data. An example is:

  # echo 34 > /sys/kernel/debug/ice/0000\:18\:00.0/fwlog/data

In addition to being able to read the data the user can configure how
much memory is used to store FW log data. This allows the user to
increase/decrease the amount of memory based on the users situation.
The data is stored such that if the memory fills up then the oldest data
will get overwritten in a circular manner. To change the amount of
memory the user can write to the 'log_size' file like this:

  # echo <value> > /sys/kernel/debug/ice/0000\:18\:00.0/fwlog/log_size

Where <value> is one of 128K, 256K, 512K, 1M, and 2M. The default value
is 1M.

The user can see the current value of 'log_size' by reading the file:

  # cat /sys/kernel/debug/ice/0000\:18\:00.0/fwlog/log_size

Signed-off-by: Paul M Stillwell Jr <paul.m.stillwell.jr@intel.com>
Tested-by: Pucha Himasekhar Reddy <himasekharx.reddy.pucha@intel.com> (A Contingent worker at Intel)
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

1 files changed, 21 insertions, 0 deletions

diff --git a/drivers/net/ethernet/intel/ice/ice_fwlog.h b/drivers/net/ethernet/intel/ice/ice_fwlog.h
index 45865558425d..287e71fa4b86 100644
--- a/drivers/net/ethernet/intel/ice/ice_fwlog.h
+++ b/drivers/net/ethernet/intel/ice/ice_fwlog.h
@@ -47,6 +47,26 @@ struct ice_fwlog_cfg {
 	u16 log_resolution;
 };
 
+struct ice_fwlog_data {
+	u16 data_size;
+	u8 *data;
+};
+
+struct ice_fwlog_ring {
+	struct ice_fwlog_data *rings;
+	u16 index;
+	u16 size;
+	u16 head;
+	u16 tail;
+};
+
+#define ICE_FWLOG_RING_SIZE_INDEX_DFLT 3
+#define ICE_FWLOG_RING_SIZE_DFLT 256
+#define ICE_FWLOG_RING_SIZE_MAX 512
+
+bool ice_fwlog_ring_full(struct ice_fwlog_ring *rings);
+bool ice_fwlog_ring_empty(struct ice_fwlog_ring *rings);
+void ice_fwlog_ring_increment(u16 *item, u16 size);
 void ice_fwlog_set_supported(struct ice_hw *hw);
 bool ice_fwlog_supported(struct ice_hw *hw);
 int ice_fwlog_init(struct ice_hw *hw);
@@ -55,4 +75,5 @@ int ice_fwlog_set(struct ice_hw *hw, struct ice_fwlog_cfg *cfg);
 int ice_fwlog_get(struct ice_hw *hw, struct ice_fwlog_cfg *cfg);
 int ice_fwlog_register(struct ice_hw *hw);
 int ice_fwlog_unregister(struct ice_hw *hw);
+void ice_fwlog_realloc_rings(struct ice_hw *hw, int index);
 #endif /* _ICE_FWLOG_H_ */