netdev - [PATCH net v3] Expose RDS features via sysfs.

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Message-ID: <20250618031522.3859138-1-konrad.wilk@oracle.com>
Date: Tue, 17 Jun 2025 23:13:08 -0400
From: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To: allison.henderson@...cle.com, netdev@...r.kernel.org,
        linux-rdma@...r.kernel.org, rds-devel@....oracle.com, tj@...nel.org,
        andrew@...n.ch
Cc: hannes@...xchg.org, mkoutny@...e.com, cgroups@...r.kernel.org
Subject: [PATCH net v3] Expose RDS features via sysfs.

Hi folks,

Changelog:
+ Since v2:
 - Changed it to use sysfs and expose a 'features' file with the data.
+ Since v3:
 - Use a 'features' directory similar to ext4, btrfs and expose each feature.
 - Expand on the Documentation
 
This patch addresses an issue where we have applications compiled against
against older (or newer) kernels. RDS does not have any ioctls to query
for what version of ABIs it has or what features it has. Hence this solution
that proposes to put this ABI information in sysfs space.


 Documentation/ABI/stable/sysfs-transport-rds | 55 ++++++++++++++++++++++++
 net/rds/af_rds.c                             | 62 +++++++++++++++++++++++++++-
 2 files changed, 116 insertions(+), 1 deletion(-)

Konrad Rzeszutek Wilk (1):
      rds: Expose feature parameters via sysfs (and ELF)