netdev - [PATCH net-next v2 4/4] rds: Fix endianness annotations for RDS extension headers

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Message-Id: <20250820175550.498-5-ujwal.kundur@gmail.com>
Date: Wed, 20 Aug 2025 23:25:50 +0530
From: Ujwal Kundur <ujwal.kundur@...il.com>
To: allison.henderson@...cle.com,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	horms@...nel.org
Cc: netdev@...r.kernel.org,
	linux-rdma@...r.kernel.org,
	rds-devel@....oracle.com,
	linux-kernel@...r.kernel.org,
	Ujwal Kundur <ujwal.kundur@...il.com>
Subject: [PATCH net-next v2 4/4] rds: Fix endianness annotations for RDS extension headers

Per the RDS 3.1 spec [1], RDS extension headers EXTHDR_NPATHS and
EXTHDR_GEN_NUM are be16 and be32 values respectively, exchanged during
normal operations over-the-wire (RDS Ping/Pong). This contrasts their
declarations as host endian unsigned ints.

Fix the annotations across occurrences. Flagged by Sparse.

[1] https://oss.oracle.com/projects/rds/dist/documentation/rds-3.1-spec.html

Signed-off-by: Ujwal Kundur <ujwal.kundur@...il.com>
---
 net/rds/message.c | 4 ++--
 net/rds/recv.c    | 4 ++--
 net/rds/send.c    | 4 ++--
 3 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/net/rds/message.c b/net/rds/message.c
index 7af59d2443e5..199a899a43e9 100644
--- a/net/rds/message.c
+++ b/net/rds/message.c
@@ -44,8 +44,8 @@ static unsigned int	rds_exthdr_size[__RDS_EXTHDR_MAX] = {
 [RDS_EXTHDR_VERSION]	= sizeof(struct rds_ext_header_version),
 [RDS_EXTHDR_RDMA]	= sizeof(struct rds_ext_header_rdma),
 [RDS_EXTHDR_RDMA_DEST]	= sizeof(struct rds_ext_header_rdma_dest),
-[RDS_EXTHDR_NPATHS]	= sizeof(u16),
-[RDS_EXTHDR_GEN_NUM]	= sizeof(u32),
+[RDS_EXTHDR_NPATHS]	= sizeof(__be16),
+[RDS_EXTHDR_GEN_NUM]	= sizeof(__be32),
 };
 
 void rds_message_addref(struct rds_message *rm)
diff --git a/net/rds/recv.c b/net/rds/recv.c
index 5627f80013f8..66205d6924bf 100644
--- a/net/rds/recv.c
+++ b/net/rds/recv.c
@@ -202,8 +202,8 @@ static void rds_recv_hs_exthdrs(struct rds_header *hdr,
 	unsigned int pos = 0, type, len;
 	union {
 		struct rds_ext_header_version version;
-		u16 rds_npaths;
-		u32 rds_gen_num;
+		__be16 rds_npaths;
+		__be32 rds_gen_num;
 	} buffer;
 	u32 new_peer_gen_num = 0;
 
diff --git a/net/rds/send.c b/net/rds/send.c
index 42d991bc8543..0b3d0ef2f008 100644
--- a/net/rds/send.c
+++ b/net/rds/send.c
@@ -1454,8 +1454,8 @@ rds_send_probe(struct rds_conn_path *cp, __be16 sport,
 
 	if (RDS_HS_PROBE(be16_to_cpu(sport), be16_to_cpu(dport)) &&
 	    cp->cp_conn->c_trans->t_mp_capable) {
-		u16 npaths = cpu_to_be16(RDS_MPATH_WORKERS);
-		u32 my_gen_num = cpu_to_be32(cp->cp_conn->c_my_gen_num);
+		__be16 npaths = cpu_to_be16(RDS_MPATH_WORKERS);
+		__be32 my_gen_num = cpu_to_be32(cp->cp_conn->c_my_gen_num);
 
 		rds_message_add_extension(&rm->m_inc.i_hdr,
 					  RDS_EXTHDR_NPATHS, &npaths,
-- 
2.30.2