[PATCH v2 0/9] consolidate sysfs access

[Stephen Hemminger <stephen@networkplumber.org>]

After reviewing lots of drivers and seeing sloppy string handling
resorted to AI assistance to unify and consolidate the parsing
of sysfs values. Many drivers open code this with similar pattern
but lacked any coherent error handling. The kernel API is
consistent and won't give bad data, but it make sense to
check for garbage.

Add one set of routines in EAL that build the path from a printf
style format and convert with strtoul()/strtol(), then convert the
existing callers.

Since the new routines are Linux only, a driver that uses sysfs while
advertising support on FreeBSD or Windows now fails to link. Two such
cases turned up and are fixed here: the eal_fs test and common/ionic.

Note: existing eal_parse_sysfs_value() goes away with this.
It was exported as a stable symbol, which was a mistake:
the eal_ prefix and the private eal_filesystem.h both say it is internal,
and nothing outside the tree should have been calling it.
The new rte_sysfs_parse_XXX routines are exported, but marked
as internal use only.

v2 - checkpatch fixes
   - clang format attribute fix
   - sysfs is Linux only, not unix

Stephen Hemminger (9):
  eal: add common sysfs value routines
  dma/idxd: use common sysfs routines
  common/ionic: use common sysfs routines
  bus/vmbus: use common sysfs routines
  power: use common sysfs routines
  drivers/bus: remove duplicate sysfs string helpers
  common/mlx5: use common sysfs routines
  net/mlx5: use common sysfs routines
  net/mana: use common sysfs routines

 app/test/test_eal_fs.c                        | 148 ++++++++++----
 drivers/bus/auxiliary/linux/auxiliary.c       |  13 +-
 drivers/bus/cdx/cdx.c                         |   7 +-
 drivers/bus/pci/linux/pci.c                   |  44 ++--
 drivers/bus/platform/platform.c               |  43 +---
 drivers/bus/vmbus/linux/vmbus_bus.c           |  64 ++----
 drivers/bus/vmbus/linux/vmbus_uio.c           |  24 +--
 drivers/common/cnxk/roc_model.c               |  40 +---
 drivers/common/cnxk/roc_platform.h            |   3 +-
 drivers/common/ionic/ionic_common_uio.c       | 102 +++++-----
 .../common/mlx5/linux/mlx5_common_auxiliary.c |  13 +-
 drivers/common/mlx5/linux/mlx5_common_os.c    |  39 ++--
 drivers/dma/idxd/idxd_bus.c                   |  80 ++------
 drivers/net/af_xdp/rte_eth_af_xdp.c           |  13 +-
 drivers/net/mana/mana.c                       |  14 +-
 drivers/net/mlx5/linux/mlx5_ethdev_os.c       |  17 +-
 drivers/net/mlx5/linux/mlx5_os.c              |  13 +-
 drivers/power/acpi/acpi_cpufreq.c             |  21 +-
 drivers/power/amd_pstate/amd_pstate_cpufreq.c |  63 +-----
 drivers/power/cppc/cppc_cpufreq.c             |  69 +------
 .../power/intel_pstate/intel_pstate_cpufreq.c |  99 ++-------
 drivers/power/intel_uncore/intel_uncore.c     |  32 +--
 lib/eal/common/eal_filesystem.h               |   4 +-
 lib/eal/include/meson.build                   |   1 +
 lib/eal/include/rte_sysfs.h                   | 121 +++++++++++
 lib/eal/linux/eal_hugepage_info.c             |  33 +--
 lib/eal/linux/eal_lcore.c                     |  18 +-
 lib/eal/linux/eal_sysfs.c                     | 188 ++++++++++++++++++
 lib/eal/linux/meson.build                     |   1 +
 lib/eal/unix/eal_filesystem.c                 |  31 ---
 lib/power/power_common.c                      |  52 +++--
 lib/power/power_common.h                      |   6 +
 lib/power/rte_power_qos.c                     |  29 +--
 33 files changed, 690 insertions(+), 755 deletions(-)
 create mode 100644 lib/eal/include/rte_sysfs.h
 create mode 100644 lib/eal/linux/eal_sysfs.c

-- 
2.53.0