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Message-Id: <20240613073441.781919-1-dqfext@gmail.com>
Date: Thu, 13 Jun 2024 15:34:41 +0800
From: Qingfang Deng <dqfext@...il.com>
To: "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,
linux-kernel@...r.kernel.org
Cc: Joe Perches <joe@...ches.com>,
Qingfang Deng <qingfang.deng@...lower.com.cn>
Subject: [PATCH net-next] etherdevice: Optimize is_broadcast_ether_addr
From: Qingfang Deng <qingfang.deng@...lower.com.cn>
Like is_zero_ether_addr, is_broadcast_ether_addr can also be optimized
by using a 32-bit load if CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS is set.
Sign extension is used to populate the upper 16-bit of the 16-bit load.
Signed-off-by: Qingfang Deng <qingfang.deng@...lower.com.cn>
---
include/linux/etherdevice.h | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/include/linux/etherdevice.h b/include/linux/etherdevice.h
index 2ad1ffa4ccb9..23b9cc5e299d 100644
--- a/include/linux/etherdevice.h
+++ b/include/linux/etherdevice.h
@@ -174,9 +174,14 @@ static inline bool is_local_ether_addr(const u8 *addr)
*/
static inline bool is_broadcast_ether_addr(const u8 *addr)
{
+#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
+ return (*(const s32 *)(addr + 0) &
+ *(const s16 *)(addr + 4)) == (s32)0xffffffff;
+#else
return (*(const u16 *)(addr + 0) &
*(const u16 *)(addr + 2) &
*(const u16 *)(addr + 4)) == 0xffff;
+#endif
}
/**
--
2.34.1
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