Re: [RFC PATCH v12 17/17] dlb: add basic sysfs interfaces
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From: Stephen Hemminger <stephen@networkplumber.org>
Date: 2021-12-21 23:35:03
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On Tue, 21 Dec 2021 00:50:47 -0600 Mike Ximing Chen [off-list ref] wrote:
quoted hunk ↗ jump to hunk
The dlb sysfs interfaces include files for reading the total and available device resources, and reading the device ID and version. The interfaces are used for device level configurations and resource inquiries. Signed-off-by: Mike Ximing Chen <redacted> --- Documentation/ABI/testing/sysfs-driver-dlb | 116 ++++++++++++ drivers/misc/dlb/dlb_args.h | 34 ++++ drivers/misc/dlb/dlb_main.c | 5 + drivers/misc/dlb/dlb_main.h | 3 + drivers/misc/dlb/dlb_pf_ops.c | 195 +++++++++++++++++++++ drivers/misc/dlb/dlb_resource.c | 50 ++++++ 6 files changed, 403 insertions(+) create mode 100644 Documentation/ABI/testing/sysfs-driver-dlbdiff --git a/Documentation/ABI/testing/sysfs-driver-dlb b/Documentation/ABI/testing/sysfs-driver-dlb new file mode 100644 index 000000000000..bf09ef6f8a3a --- /dev/null +++ b/Documentation/ABI/testing/sysfs-driver-dlb@@ -0,0 +1,116 @@ +What: /sys/bus/pci/devices/.../total_resources/num_atomic_inflights +What: /sys/bus/pci/devices/.../total_resources/num_dir_credits +What: /sys/bus/pci/devices/.../total_resources/num_dir_ports +What: /sys/bus/pci/devices/.../total_resources/num_hist_list_entries +What: /sys/bus/pci/devices/.../total_resources/num_ldb_credits +What: /sys/bus/pci/devices/.../total_resources/num_ldb_ports +What: /sys/bus/pci/devices/.../total_resources/num_cos0_ldb_ports +What: /sys/bus/pci/devices/.../total_resources/num_cos1_ldb_ports +What: /sys/bus/pci/devices/.../total_resources/num_cos2_ldb_ports +What: /sys/bus/pci/devices/.../total_resources/num_cos3_ldb_ports +What: /sys/bus/pci/devices/.../total_resources/num_ldb_queues +What: /sys/bus/pci/devices/.../total_resources/num_sched_domains +Date: Oct 15, 2021 +KernelVersion: 5.15 +Contact: mike.ximing.chen@intel.com +Description: + The total_resources subdirectory contains read-only files that + indicate the total number of resources in the device. + + num_atomic_inflights: Total number of atomic inflights in the + device. Atomic inflights refers to the + on-device storage used by the atomic + scheduler. + + num_dir_credits: Total number of directed credits in the + device. + + num_dir_ports: Total number of directed ports (and + queues) in the device. + + num_hist_list_entries: Total number of history list entries in + the device. + + num_ldb_credits: Total number of load-balanced credits in + the device. + + num_ldb_ports: Total number of load-balanced ports in + the device. + + num_cos<M>_ldb_ports: Total number of load-balanced ports + belonging to class-of-service M in the + device. + + num_ldb_queues: Total number of load-balanced queues in + the device. + + num_sched_domains: Total number of scheduling domains in the + device. +
Sysfs is only slightly better than /proc as an API. If it is just for testing than debugfs might be better. Could this be done with a real netlink interface? Maybe as part of devlink?