linux-kernel - [PATCH] RDMA/ucma: fix rdma_ucm_query_ib_service

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Message-Id: <20251208133311.313977-1-arnd@kernel.org>
Date: Mon,  8 Dec 2025 14:33:05 +0100
From: Arnd Bergmann <arnd@...nel.org>
To: Jason Gunthorpe <jgg@...pe.ca>,
	Leon Romanovsky <leon@...nel.org>,
	Or Har-Toov <ohartoov@...dia.com>,
	Vlad Dumitrescu <vdumitrescu@...dia.com>,
	Mark Zhang <markzhang@...dia.com>
Cc: Arnd Bergmann <arnd@...db.de>,
	linux-rdma@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] RDMA/ucma: fix rdma_ucm_query_ib_service_resp struct padding

From: Arnd Bergmann <arnd@...db.de>

On a few 32-bit architectures, the newly added ib_user_service_rec
structure is not 64-bit aligned the way it is on most regular ones.

Add explicit padding into the rdma_ucm_query_ib_service_resp and
rdma_ucm_resolve_ib_service structures that embed it, so that the
layout is compatible across all of them.

This is an ABI change on i386, aligning it with x86_64 and the other
64-bit architectures to avoid having to use a compat ioctl handler.

Fixes: 810f874eda8e ("RDMA/ucma: Support query resolved service records")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 include/uapi/rdma/rdma_user_cm.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/uapi/rdma/rdma_user_cm.h b/include/uapi/rdma/rdma_user_cm.h
index 5ded174687ee..8e1d584f6633 100644
--- a/include/uapi/rdma/rdma_user_cm.h
+++ b/include/uapi/rdma/rdma_user_cm.h
@@ -192,6 +192,7 @@ struct rdma_ucm_query_path_resp {
 
 struct rdma_ucm_query_ib_service_resp {
 	__u32 num_service_recs;
+	__u32 :32;
 	struct ib_user_service_rec recs[];
 };
 
@@ -362,6 +363,7 @@ struct rdma_ucm_ib_service {
 
 struct rdma_ucm_resolve_ib_service {
 	__u32 id;
+	__u32 :32;
 	struct rdma_ucm_ib_service ibs;
 };
 
-- 
2.39.5