linux-kernel - [PATCH] bpf: add endian modifiers to fix endian warnings

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Date:   Thu, 14 Jul 2022 11:51:01 +0100
From:   Ben Dooks <ben.dooks@...ive.com>
To:     linux-kernel@...r.kernel.org
Cc:     Sudip Mukherjee <sudip.mukherjee@...ive.com>,
        Jude Onyenegecha <jude.onyenegecha@...ive.com>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Claudiu Beznea <claudiu.beznea@...rochip.com>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        Ben Dooks <ben.dooks@...ive.com>
Subject: [PATCH] bpf: add endian modifiers to fix endian warnings

A couple of the syscalls which load values (bpf_skb_load_helper_16
and bpf_skb_load_helper_32) are using u16/u32 types which are
triggering warnings as they are then converted from big-endian
to cpu-endian. Fix these by making the types __be instead.

Fixes the following sparse warnings:

net/core/filter.c:246:32: warning: cast to restricted __be16
net/core/filter.c:246:32: warning: cast to restricted __be16
net/core/filter.c:246:32: warning: cast to restricted __be16
net/core/filter.c:246:32: warning: cast to restricted __be16
net/core/filter.c:273:32: warning: cast to restricted __be32
net/core/filter.c:273:32: warning: cast to restricted __be32
net/core/filter.c:273:32: warning: cast to restricted __be32
net/core/filter.c:273:32: warning: cast to restricted __be32
net/core/filter.c:273:32: warning: cast to restricted __be32
net/core/filter.c:273:32: warning: cast to restricted __be32

Signed-off-by: Ben Dooks <ben.dooks@...ive.com>
---
 net/core/filter.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/core/filter.c b/net/core/filter.c
index 5d16d66727fc..c971dfaed74b 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -237,7 +237,7 @@ BPF_CALL_2(bpf_skb_load_helper_8_no_cache, const struct sk_buff *, skb,
 BPF_CALL_4(bpf_skb_load_helper_16, const struct sk_buff *, skb, const void *,
 	   data, int, headlen, int, offset)
 {
-	u16 tmp, *ptr;
+	__be16 tmp, *ptr;
 	const int len = sizeof(tmp);
 
 	if (offset >= 0) {
@@ -264,7 +264,7 @@ BPF_CALL_2(bpf_skb_load_helper_16_no_cache, const struct sk_buff *, skb,
 BPF_CALL_4(bpf_skb_load_helper_32, const struct sk_buff *, skb, const void *,
 	   data, int, headlen, int, offset)
 {
-	u32 tmp, *ptr;
+	__be32 tmp, *ptr;
 	const int len = sizeof(tmp);
 
 	if (likely(offset >= 0)) {
-- 
2.35.1