File devlink-report-maximum-number-of-snapshots-with-regi.patch of Package linux-glibc-devel.29113

From: Jacob Keller <jacob.e.keller@intel.com>
Date: Thu, 30 Sep 2021 14:21:04 -0700
Subject: devlink: report maximum number of snapshots with regions
Patch-mainline: v5.16-rc1
Git-commit: a70e3f024d5f4ec7edb17ab5d927eb55397f1d15
References: jsc#SLE-19253

Each region has an independently configurable number of maximum
snapshots. This information is not reported to userspace, making it not
very discoverable. Fix this by adding a new
DEVLINK_ATTR_REGION_MAX_SNAPSHOST attribute which is used to report this
maximum.

Ex:

  $devlink region
  pci/0000:af:00.0/nvm-flash: size 10485760 snapshot [] max 1
  pci/0000:af:00.0/device-caps: size 4096 snapshot [] max 10
  pci/0000:af:00.1/nvm-flash: size 10485760 snapshot [] max 1
  pci/0000:af:00.1/device-caps: size 4096 snapshot [] max 10

This information enables users to understand why a new region command
may fail due to having too many existing snapshots.

Reported-by: Gurucharan G <gurucharanx.g@intel.com> (A Contingent worker at Intel)
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Acked-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 Documentation/networking/devlink/devlink-region.rst |    4 ++--
 Documentation/networking/devlink/ice.rst            |    4 ++++
 include/uapi/linux/devlink.h                        |    2 ++
 net/core/devlink.c                                  |    5 +++++
 4 files changed, 13 insertions(+), 2 deletions(-)

--- a/include/linux/devlink.h
+++ b/include/linux/devlink.h
@@ -551,6 +551,8 @@ enum devlink_attr {
 	DEVLINK_ATTR_RATE_NODE_NAME,		/* string */
 	DEVLINK_ATTR_RATE_PARENT_NODE_NAME,	/* string */
 
+	DEVLINK_ATTR_REGION_MAX_SNAPSHOTS,	/* u32 */
+
 	/* add new attributes above here, update the policy in devlink.c */
 
 	__DEVLINK_ATTR_MAX,