Merge branch '100GbE' of git://git.kernel.org/pub/scm/linux/kernel/git/tnguy/next-queue

Tony Nguyen says:

====================
add v2 FW logging for ice driver

Paul Stillwell says:

Firmware (FW) log support was added to the ice driver, but that version is
no longer supported. There is a newer version of FW logging (v2) that
adds more control knobs to get the exact data out of the FW
for debugging.

The interface for FW logging is debugfs. This was chosen based on
discussions here:
https://lore.kernel.org/netdev/[email protected]/ and
https://lore.kernel.org/netdev/[email protected]/

We talked about using devlink in a variety of ways, but none of those
options made any sense for the way the FW reports data. We briefly talked
about using ethtool, but that seemed to go by the wayside. Ultimately it
seems like using debugfs is the way to go so re-implement the code to use
that.

FW logging is across all the PFs on the device so restrict the commands to
only PF0.

If the device supports FW logging then a directory named 'fwlog' will be
created under '/sys/kernel/debug/ice/<pci_dev>'. A variety of files will be
created to manage the behavior of logging. The following files will be
created:
- modules/<module>
- nr_messages
- enable
- log_size
- data

where
modules/<module> is used to read/write the log level for a specific module

nr_messages is used to determine how many events should be in each message
sent to the driver

enable is used to start/stop FW logging. This is a boolean value so only 1
or 0 are permissible values

log_size is used to configure the amount of memory the driver uses for log
data

data is used to read/clear the log data

Generally there is a lot of data and dumping that data to syslog will
result in a loss of data. This causes problems when decoding the data and
the user doesn't know that data is missing until later. Instead of dumping
the FW log output to syslog use debugfs. This ensures that all the data the
driver has gets retrieved correctly.

The FW log data is binary data that the FW team decodes to determine what
happened in firmware. The binary blob is sent to Intel for decoding.
---
v6:
- use seq_printf() for outputting module info when reading from 'module' file
- replace code that created argc and argv for handling command line input
- removed checks in all the _read() and _write() functions to see if FW logging
  is supported because the files will not exist if it is not supported
- removed warnings on allocation failures on debugfs file creation failures
- removed a newline between memory allocation and checking if the memory was
  allocated
- fixed cases where we could just return the value from a function call
  instead of saving the value in a variable
- moved the check for PFO in ice_fwlog_init() to an earlier patch
- reworked all of argument scanning in the _write() functions in ice_debugfs.c
  to remove adding characters past the end of the buffer

v5: https://lore.kernel.org/netdev/[email protected]/
- changed the log level configuration from a single file for all modules to a
  file per module.
- changed 'nr_buffs' to 'log_size' because users understand memory sizes
  better than a number of buffers
- changed 'resolution' to 'nr_messages' to better reflect what it represents
- updated documentation to reflect these changes
- updated documentation to indicate that FW logging must be disabled to
  clear the data. also clarified that any value written to the 'data' file will
  clear the data

v4: https://lore.kernel.org/netdev/[email protected]/
- removed CONFIG_DEBUG_FS wrapper around code because the debugfs calls handle
  this case already
- moved ice_debugfs_exit() call to remove unreachable code issue
- minor changes to documentation based on feedback

v3: https://lore.kernel.org/netdev/[email protected]/
- Adjust error path cleanup in ice_module_init() for unreachable code.

v2: https://lore.kernel.org/netdev/[email protected]/
- Rewrote code to use debugfs instead of devlink

v1: https://lore.kernel.org/netdev/[email protected]/
====================

Signed-off-by: David S. Miller <[email protected]>

Author: davem330

Documentation/networking/device_drivers/ethernet/intel/ice.rst

@@ -895,6 +895,147 @@ driver writes raw bytes by the GNSS object to the receiver through i2c. Please
 refer to the hardware GNSS module documentation for configuration details.
 
 
+Firmware (FW) logging
+---------------------
+The driver supports FW logging via the debugfs interface on PF 0 only. The FW
+running on the NIC must support FW logging; if the FW doesn't support FW logging
+the 'fwlog' file will not get created in the ice debugfs directory.
+
+Module configuration
+~~~~~~~~~~~~~~~~~~~~
+Firmware logging is configured on a per module basis. Each module can be set to
+a value independent of the other modules (unless the module 'all' is specified).
+The modules will be instantiated under the 'fwlog/modules' directory.
+
+The user can set the log level for a module by writing to the module file like
+this::
+
+  # echo <log_level> > /sys/kernel/debug/ice/0000\:18\:00.0/fwlog/modules/<module>
+
+where
+
+* log_level is a name as described below. Each level includes the
+  messages from the previous/lower level
+
+      *	none
+      *	error
+      *	warning
+      *	normal
+      *	verbose
+
+* module is a name that represents the module to receive events for. The
+  module names are
+
+      *	general
+      *	ctrl
+      *	link
+      *	link_topo
+      *	dnl
+      *	i2c
+      *	sdp
+      *	mdio
+      *	adminq
+      *	hdma
+      *	lldp
+      *	dcbx
+      *	dcb
+      *	xlr
+      *	nvm
+      *	auth
+      *	vpd
+      *	iosf
+      *	parser
+      *	sw
+      *	scheduler
+      *	txq
+      *	rsvd
+      *	post
+      *	watchdog
+      *	task_dispatch
+      *	mng
+      *	synce
+      *	health
+      *	tsdrv
+      *	pfreg
+      *	mdlver
+      *	all
+
+The name 'all' is special and allows the user to set all of the modules to the
+specified log_level or to read the log_level of all of the modules.
+
+Example usage to configure the modules
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+To set a single module to 'verbose'::
+
+  # echo verbose > /sys/kernel/debug/ice/0000\:18\:00.0/fwlog/modules/link
+
+To set multiple modules then issue the command multiple times::
+
+  # echo verbose > /sys/kernel/debug/ice/0000\:18\:00.0/fwlog/modules/link
+  # echo warning > /sys/kernel/debug/ice/0000\:18\:00.0/fwlog/modules/ctrl
+  # echo none > /sys/kernel/debug/ice/0000\:18\:00.0/fwlog/modules/dcb
+
+To set all the modules to the same value::
+
+  # echo normal > /sys/kernel/debug/ice/0000\:18\:00.0/fwlog/modules/all
+
+To read the log_level of a specific module (e.g. module 'general')::
+
+  # cat /sys/kernel/debug/ice/0000\:18\:00.0/fwlog/modules/general
+
+To read the log_level of all the modules::
+
+  # cat /sys/kernel/debug/ice/0000\:18\:00.0/fwlog/modules/all
+
+Enabling FW log
+~~~~~~~~~~~~~~~
+Configuring the modules indicates to the FW that the configured modules should
+generate events that the driver is interested in, but it **does not** send the
+events to the driver until the enable message is sent to the FW. To do this
+the user can write a 1 (enable) or 0 (disable) to 'fwlog/enable'. An example
+is::
+
+  # echo 1 > /sys/kernel/debug/ice/0000\:18\:00.0/fwlog/enable
+
+Retrieving FW log data
+~~~~~~~~~~~~~~~~~~~~~~
+The FW log data can be retrieved by reading from 'fwlog/data'. The user can
+write any value to 'fwlog/data' to clear the data. The data can only be cleared
+when FW logging is disabled. The FW log data is a binary file that is sent to
+Intel and used to help debug user issues.
+
+An example to read the data is::
+
+  # cat /sys/kernel/debug/ice/0000\:18\:00.0/fwlog/data > fwlog.bin
+
+An example to clear the data is::
+
+  # echo 0 > /sys/kernel/debug/ice/0000\:18\:00.0/fwlog/data
+
+Changing how often the log events are sent to the driver
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+The driver receives FW log data from the Admin Receive Queue (ARQ). The
+frequency that the FW sends the ARQ events can be configured by writing to
+'fwlog/nr_messages'. The range is 1-128 (1 means push every log message, 128
+means push only when the max AQ command buffer is full). The suggested value is
+10. The user can see what the value is configured to by reading
+'fwlog/nr_messages'. An example to set the value is::
+
+  # echo 50 > /sys/kernel/debug/ice/0000\:18\:00.0/fwlog/nr_messages
+
+Configuring the amount of memory used to store FW log data
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+The driver stores FW log data within the driver. The default size of the memory
+used to store the data is 1MB. Some use cases may require more or less data so
+the user can change the amount of memory that is allocated for FW log data.
+To change the amount of memory then write to 'fwlog/log_size'. The value must be
+one of: 128K, 256K, 512K, 1M, or 2M. FW logging must be disabled to change the
+value. An example of changing the value is::
+
+  # echo 128K > /sys/kernel/debug/ice/0000\:18\:00.0/fwlog/log_size
+
+
 Performance Optimization
 ========================
 Driver defaults are meant to fit a wide variety of workloads, but if further

drivers/net/ethernet/intel/ice/Makefile

@@ -34,7 +34,9 @@ ice-y := ice_main.o	\
 	 ice_lag.o	\
 	 ice_ethtool.o  \
 	 ice_repr.o	\
-	 ice_tc_lib.o
+	 ice_tc_lib.o	\
+	 ice_fwlog.o	\
+	 ice_debugfs.o
 ice-$(CONFIG_PCI_IOV) +=	\
 	ice_sriov.o		\
 	ice_virtchnl.o		\

drivers/net/ethernet/intel/ice/ice.h

@@ -571,6 +571,10 @@ struct ice_pf {
 	struct ice_vsi_stats **vsi_stats;
 	struct ice_sw *first_sw;	/* first switch created by firmware */
 	u16 eswitch_mode;		/* current mode of eswitch */
+	struct dentry *ice_debugfs_pf;
+	struct dentry *ice_debugfs_pf_fwlog;
+	/* keep track of all the dentrys for FW log modules */
+	struct dentry **ice_debugfs_pf_fwlog_modules;
 	struct ice_vfs vfs;
 	DECLARE_BITMAP(features, ICE_F_MAX);
 	DECLARE_BITMAP(state, ICE_STATE_NBITS);
@@ -890,6 +894,11 @@ static inline bool ice_is_adq_active(struct ice_pf *pf)
 	return false;
 }
 
+void ice_debugfs_fwlog_init(struct ice_pf *pf);
+void ice_debugfs_init(void);
+void ice_debugfs_exit(void);
+void ice_pf_fwlog_update_module(struct ice_pf *pf, int log_level, int module);
+
 bool netif_is_ice(const struct net_device *dev);
 int ice_vsi_setup_tx_rings(struct ice_vsi *vsi);
 int ice_vsi_setup_rx_rings(struct ice_vsi *vsi);

drivers/net/ethernet/intel/ice/ice_adminq_cmd.h

@@ -2094,78 +2094,6 @@ struct ice_aqc_add_rdma_qset_data {
 	struct ice_aqc_add_tx_rdma_qset_entry rdma_qsets[];
 };
 
-/* Configure Firmware Logging Command (indirect 0xFF09)
- * Logging Information Read Response (indirect 0xFF10)
- * Note: The 0xFF10 command has no input parameters.
- */
-struct ice_aqc_fw_logging {
-	u8 log_ctrl;
-#define ICE_AQC_FW_LOG_AQ_EN		BIT(0)
-#define ICE_AQC_FW_LOG_UART_EN		BIT(1)
-	u8 rsvd0;
-	u8 log_ctrl_valid; /* Not used by 0xFF10 Response */
-#define ICE_AQC_FW_LOG_AQ_VALID		BIT(0)
-#define ICE_AQC_FW_LOG_UART_VALID	BIT(1)
-	u8 rsvd1[5];
-	__le32 addr_high;
-	__le32 addr_low;
-};
-
-enum ice_aqc_fw_logging_mod {
-	ICE_AQC_FW_LOG_ID_GENERAL = 0,
-	ICE_AQC_FW_LOG_ID_CTRL,
-	ICE_AQC_FW_LOG_ID_LINK,
-	ICE_AQC_FW_LOG_ID_LINK_TOPO,
-	ICE_AQC_FW_LOG_ID_DNL,
-	ICE_AQC_FW_LOG_ID_I2C,
-	ICE_AQC_FW_LOG_ID_SDP,
-	ICE_AQC_FW_LOG_ID_MDIO,
-	ICE_AQC_FW_LOG_ID_ADMINQ,
-	ICE_AQC_FW_LOG_ID_HDMA,
-	ICE_AQC_FW_LOG_ID_LLDP,
-	ICE_AQC_FW_LOG_ID_DCBX,
-	ICE_AQC_FW_LOG_ID_DCB,
-	ICE_AQC_FW_LOG_ID_NETPROXY,
-	ICE_AQC_FW_LOG_ID_NVM,
-	ICE_AQC_FW_LOG_ID_AUTH,
-	ICE_AQC_FW_LOG_ID_VPD,
-	ICE_AQC_FW_LOG_ID_IOSF,
-	ICE_AQC_FW_LOG_ID_PARSER,
-	ICE_AQC_FW_LOG_ID_SW,
-	ICE_AQC_FW_LOG_ID_SCHEDULER,
-	ICE_AQC_FW_LOG_ID_TXQ,
-	ICE_AQC_FW_LOG_ID_RSVD,
-	ICE_AQC_FW_LOG_ID_POST,
-	ICE_AQC_FW_LOG_ID_WATCHDOG,
-	ICE_AQC_FW_LOG_ID_TASK_DISPATCH,
-	ICE_AQC_FW_LOG_ID_MNG,
-	ICE_AQC_FW_LOG_ID_MAX,
-};
-
-/* Defines for both above FW logging command/response buffers */
-#define ICE_AQC_FW_LOG_ID_S		0
-#define ICE_AQC_FW_LOG_ID_M		(0xFFF << ICE_AQC_FW_LOG_ID_S)
-
-#define ICE_AQC_FW_LOG_CONF_SUCCESS	0	/* Used by response */
-#define ICE_AQC_FW_LOG_CONF_BAD_INDX	BIT(12)	/* Used by response */
-
-#define ICE_AQC_FW_LOG_EN_S		12
-#define ICE_AQC_FW_LOG_EN_M		(0xF << ICE_AQC_FW_LOG_EN_S)
-#define ICE_AQC_FW_LOG_INFO_EN		BIT(12)	/* Used by command */
-#define ICE_AQC_FW_LOG_INIT_EN		BIT(13)	/* Used by command */
-#define ICE_AQC_FW_LOG_FLOW_EN		BIT(14)	/* Used by command */
-#define ICE_AQC_FW_LOG_ERR_EN		BIT(15)	/* Used by command */
-
-/* Get/Clear FW Log (indirect 0xFF11) */
-struct ice_aqc_get_clear_fw_log {
-	u8 flags;
-#define ICE_AQC_FW_LOG_CLEAR		BIT(0)
-#define ICE_AQC_FW_LOG_MORE_DATA_AVAIL	BIT(1)
-	u8 rsvd1[7];
-	__le32 addr_high;
-	__le32 addr_low;
-};
-
 /* Download Package (indirect 0x0C40) */
 /* Also used for Update Package (indirect 0x0C41 and 0x0C42) */
 struct ice_aqc_download_pkg {
@@ -2428,6 +2356,84 @@ struct ice_aqc_event_lan_overflow {
 	u8 reserved[8];
 };
 
+enum ice_aqc_fw_logging_mod {
+	ICE_AQC_FW_LOG_ID_GENERAL = 0,
+	ICE_AQC_FW_LOG_ID_CTRL,
+	ICE_AQC_FW_LOG_ID_LINK,
+	ICE_AQC_FW_LOG_ID_LINK_TOPO,
+	ICE_AQC_FW_LOG_ID_DNL,
+	ICE_AQC_FW_LOG_ID_I2C,
+	ICE_AQC_FW_LOG_ID_SDP,
+	ICE_AQC_FW_LOG_ID_MDIO,
+	ICE_AQC_FW_LOG_ID_ADMINQ,
+	ICE_AQC_FW_LOG_ID_HDMA,
+	ICE_AQC_FW_LOG_ID_LLDP,
+	ICE_AQC_FW_LOG_ID_DCBX,
+	ICE_AQC_FW_LOG_ID_DCB,
+	ICE_AQC_FW_LOG_ID_XLR,
+	ICE_AQC_FW_LOG_ID_NVM,
+	ICE_AQC_FW_LOG_ID_AUTH,
+	ICE_AQC_FW_LOG_ID_VPD,
+	ICE_AQC_FW_LOG_ID_IOSF,
+	ICE_AQC_FW_LOG_ID_PARSER,
+	ICE_AQC_FW_LOG_ID_SW,
+	ICE_AQC_FW_LOG_ID_SCHEDULER,
+	ICE_AQC_FW_LOG_ID_TXQ,
+	ICE_AQC_FW_LOG_ID_RSVD,
+	ICE_AQC_FW_LOG_ID_POST,
+	ICE_AQC_FW_LOG_ID_WATCHDOG,
+	ICE_AQC_FW_LOG_ID_TASK_DISPATCH,
+	ICE_AQC_FW_LOG_ID_MNG,
+	ICE_AQC_FW_LOG_ID_SYNCE,
+	ICE_AQC_FW_LOG_ID_HEALTH,
+	ICE_AQC_FW_LOG_ID_TSDRV,
+	ICE_AQC_FW_LOG_ID_PFREG,
+	ICE_AQC_FW_LOG_ID_MDLVER,
+	ICE_AQC_FW_LOG_ID_MAX,
+};
+
+/* Set FW Logging configuration (indirect 0xFF30)
+ * Register for FW Logging (indirect 0xFF31)
+ * Query FW Logging (indirect 0xFF32)
+ * FW Log Event (indirect 0xFF33)
+ */
+struct ice_aqc_fw_log {
+	u8 cmd_flags;
+#define ICE_AQC_FW_LOG_CONF_UART_EN	BIT(0)
+#define ICE_AQC_FW_LOG_CONF_AQ_EN	BIT(1)
+#define ICE_AQC_FW_LOG_QUERY_REGISTERED	BIT(2)
+#define ICE_AQC_FW_LOG_CONF_SET_VALID	BIT(3)
+#define ICE_AQC_FW_LOG_AQ_REGISTER	BIT(0)
+#define ICE_AQC_FW_LOG_AQ_QUERY		BIT(2)
+
+	u8 rsp_flag;
+	__le16 fw_rt_msb;
+	union {
+		struct {
+			__le32 fw_rt_lsb;
+		} sync;
+		struct {
+			__le16 log_resolution;
+#define ICE_AQC_FW_LOG_MIN_RESOLUTION		(1)
+#define ICE_AQC_FW_LOG_MAX_RESOLUTION		(128)
+
+			__le16 mdl_cnt;
+		} cfg;
+	} ops;
+	__le32 addr_high;
+	__le32 addr_low;
+};
+
+/* Response Buffer for:
+ *    Set Firmware Logging Configuration (0xFF30)
+ *    Query FW Logging (0xFF32)
+ */
+struct ice_aqc_fw_log_cfg_resp {
+	__le16 module_identifier;
+	u8 log_level;
+	u8 rsvd0;
+};
+
 /**
  * struct ice_aq_desc - Admin Queue (AQ) descriptor
  * @flags: ICE_AQ_FLAG_* flags
@@ -2507,8 +2513,6 @@ struct ice_aq_desc {
 		struct ice_aqc_add_rdma_qset add_rdma_qset;
 		struct ice_aqc_add_get_update_free_vsi vsi_cmd;
 		struct ice_aqc_add_update_free_vsi_resp add_update_free_vsi_res;
-		struct ice_aqc_fw_logging fw_logging;
-		struct ice_aqc_get_clear_fw_log get_clear_fw_log;
 		struct ice_aqc_download_pkg download_pkg;
 		struct ice_aqc_set_cgu_input_config set_cgu_input_config;
 		struct ice_aqc_get_cgu_input_config get_cgu_input_config;
@@ -2520,6 +2524,7 @@ struct ice_aq_desc {
 		struct ice_aqc_get_cgu_ref_prio get_cgu_ref_prio;
 		struct ice_aqc_get_cgu_info get_cgu_info;
 		struct ice_aqc_driver_shared_params drv_shared_params;
+		struct ice_aqc_fw_log fw_log;
 		struct ice_aqc_set_mac_lb set_mac_lb;
 		struct ice_aqc_alloc_free_res_cmd sw_res_ctrl;
 		struct ice_aqc_set_mac_cfg set_mac_cfg;
@@ -2718,9 +2723,11 @@ enum ice_adminq_opc {
 	/* Standalone Commands/Events */
 	ice_aqc_opc_event_lan_overflow			= 0x1001,
 
-	/* debug commands */
-	ice_aqc_opc_fw_logging				= 0xFF09,
-	ice_aqc_opc_fw_logging_info			= 0xFF10,
+	/* FW Logging Commands */
+	ice_aqc_opc_fw_logs_config			= 0xFF30,
+	ice_aqc_opc_fw_logs_register			= 0xFF31,
+	ice_aqc_opc_fw_logs_query			= 0xFF32,
+	ice_aqc_opc_fw_logs_event			= 0xFF33,
 };
 
 #endif /* _ICE_ADMINQ_CMD_H_ */