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From:   Keith Busch <kbusch@kernel.org>
To:     linux-nvme@lists.infradead.org, linux-block@vger.kernel.org,
        linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org
Cc:     axboe@kernel.dk, hch@lst.de, martin.petersen@oracle.com,
        Keith Busch <kbusch@kernel.org>,
        Hannes Reinecke <hare@suse.de>,
        Chaitanya Kulkarni <kch@nvidia.com>,
        Arnd Bergmann <arnd@arndb.de>
Subject: [PATCHv4 3/8] asm-generic: introduce be48 unaligned accessors
Date:   Thu,  3 Mar 2022 12:13:07 -0800
Message-Id: <20220303201312.3255347-4-kbusch@kernel.org>
In-Reply-To: <20220303201312.3255347-1-kbusch@kernel.org>
References: <20220303201312.3255347-1-kbusch@kernel.org>
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The NVMe protocol extended the data integrity fields with unaligned
48-bit reference tags. Provide some helper accessors in
preparation for these.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Keith Busch <kbusch@kernel.org>
---
 include/asm-generic/unaligned.h | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/include/asm-generic/unaligned.h b/include/asm-generic/unaligned.h
index 1c4242416c9f..8fc637379899 100644
--- a/include/asm-generic/unaligned.h
+++ b/include/asm-generic/unaligned.h
@@ -126,4 +126,30 @@ static inline void put_unaligned_le24(const u32 val, void *p)
 	__put_unaligned_le24(val, p);
 }
 
+static inline void __put_unaligned_be48(const u64 val, __u8 *p)
+{
+	*p++ = val >> 40;
+	*p++ = val >> 32;
+	*p++ = val >> 24;
+	*p++ = val >> 16;
+	*p++ = val >> 8;
+	*p++ = val;
+}
+
+static inline void put_unaligned_be48(const u64 val, void *p)
+{
+	__put_unaligned_be48(val, p);
+}
+
+static inline u64 __get_unaligned_be48(const u8 *p)
+{
+	return (u64)p[0] << 40 | (u64)p[1] << 32 | p[2] << 24 |
+		p[3] << 16 | p[4] << 8 | p[5];
+}
+
+static inline u64 get_unaligned_be48(const void *p)
+{
+	return __get_unaligned_be48(p);
+}
+
 #endif /* __ASM_GENERIC_UNALIGNED_H */
-- 
2.25.4