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Message-Id: <20231005170110.3221306-1-anthony.l.nguyen@intel.com> Date: Thu, 5 Oct 2023 10:01:05 -0700 From: Tony Nguyen <anthony.l.nguyen@...el.com> To: davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com, edumazet@...gle.com, netdev@...r.kernel.org Cc: Tony Nguyen <anthony.l.nguyen@...el.com>, paul.m.stillwell.jr@...el.com, jacob.e.keller@...el.com, vaishnavi.tipireddy@...el.com, horms@...nel.org, leon@...nel.org Subject: [PATCH net-next v4 0/5][pull request] 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 a discussion here: https://lore.kernel.org/netdev/20230214180712.53fc8ba2@kernel.org/ 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 FW logging is supported 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 - resolution - enable - nr_buffs - data where modules is used to read/write the configuration for FW logging resolution is used to determine how often to send FW logging events to the driver enable is used to start/stop FW logging. This is a boolean value so only 1 or 0 are permissible values nr_buffs is used to configure the number of data buffers 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. --- v4: - 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/20230815165750.2789609-1-anthony.l.nguyen@intel.com/ - Adjust error path cleanup in ice_module_init() for unreachable code. v2: https://lore.kernel.org/netdev/20230810170109.1963832-1-anthony.l.nguyen@intel.com/ - Rewrote code to use debugfs instead of devlink v1: https://lore.kernel.org/netdev/20230209190702.3638688-1-anthony.l.nguyen@intel.com/ Previous discussion: https://lore.kernel.org/netdev/fea3e7bc-db75-ce15-1330-d80483267ee2@intel.com/ The following are changes since commit 49e7265fd098fdade2bbdd9331e6b914cda7fa83: net_sched: sch_fq: add TCA_FQ_WEIGHTS attribute and are available in the git repository at: git://git.kernel.org/pub/scm/linux/kernel/git/tnguy/next-queue 100GbE Paul M Stillwell Jr (5): ice: remove FW logging code ice: configure FW logging ice: enable FW logging ice: add ability to read FW log data and configure the number of log buffers ice: add documentation for FW logging .../device_drivers/ethernet/intel/ice.rst | 117 +++ drivers/net/ethernet/intel/ice/Makefile | 4 +- drivers/net/ethernet/intel/ice/ice.h | 7 + .../net/ethernet/intel/ice/ice_adminq_cmd.h | 161 ++-- drivers/net/ethernet/intel/ice/ice_common.c | 219 +---- drivers/net/ethernet/intel/ice/ice_common.h | 1 - drivers/net/ethernet/intel/ice/ice_debugfs.c | 807 ++++++++++++++++++ drivers/net/ethernet/intel/ice/ice_fwlog.c | 450 ++++++++++ drivers/net/ethernet/intel/ice/ice_fwlog.h | 78 ++ drivers/net/ethernet/intel/ice/ice_main.c | 51 +- drivers/net/ethernet/intel/ice/ice_type.h | 23 +- 11 files changed, 1603 insertions(+), 315 deletions(-) create mode 100644 drivers/net/ethernet/intel/ice/ice_debugfs.c create mode 100644 drivers/net/ethernet/intel/ice/ice_fwlog.c create mode 100644 drivers/net/ethernet/intel/ice/ice_fwlog.h -- 2.38.1
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