1 // SPDX-License-Identifier: GPL-2.0
6  * Copyright (C) 2023-2024 Rivos Inc.
11 #include <linux/kasan-checks.h>
27 	sum += (__force unsigned long)saddr->s6_addr32[0];  in csum_ipv6_magic()
28 	sum += (__force unsigned long)saddr->s6_addr32[1];  in csum_ipv6_magic()
29 	sum += (__force unsigned long)saddr->s6_addr32[2];  in csum_ipv6_magic()
30 	sum += (__force unsigned long)saddr->s6_addr32[3];  in csum_ipv6_magic()
32 	sum += (__force unsigned long)daddr->s6_addr32[0];  in csum_ipv6_magic()
33 	sum += (__force unsigned long)daddr->s6_addr32[1];  in csum_ipv6_magic()
34 	sum += (__force unsigned long)daddr->s6_addr32[2];  in csum_ipv6_magic()
35 	sum += (__force unsigned long)daddr->s6_addr32[3];  in csum_ipv6_magic()
90 	       unsigned long data)  in do_csum_common()  argument
92 	unsigned int shift;  in do_csum_common()  local
96 	 * Do 32-bit reads on RV32 and 64-bit reads otherwise. This should be  in do_csum_common()
97 	 * faster than doing 32-bit reads on architectures that support larger  in do_csum_common()
101 		csum += data;  in do_csum_common()
102 		carry += csum < data;  in do_csum_common()
103 		data = *(ptr++);  in do_csum_common()
107 	 * Perform alignment (and over-read) bytes on the tail if any bytes  in do_csum_common()
110 	shift = ((long)ptr - (long)end) * 8;  in do_csum_common()
112 	data = (data << shift) >> shift;  in do_csum_common()
114 	data = (data >> shift) << shift;  in do_csum_common()
116 	csum += data;  in do_csum_common()
117 	carry += csum < data;  in do_csum_common()
126  * If buff is not aligned, will over-read bytes but not use the bytes that it
127  * shouldn't. The same thing will occur on the tail-end of the read.
132 	unsigned int offset, shift;  in do_csum_with_alignment()  local
133 	unsigned long csum, data;  in do_csum_with_alignment()  local
143 	ptr = (const unsigned long *)(buff - offset);  in do_csum_with_alignment()
146 	 * Clear the most significant bytes that were over-read if buff was not  in do_csum_with_alignment()
149 	shift = offset * 8;  in do_csum_with_alignment()
150 	data = *(ptr++);  in do_csum_with_alignment()
152 	data = (data >> shift) << shift;  in do_csum_with_alignment()
154 	data = (data << shift) >> shift;  in do_csum_with_alignment()
157 	csum = do_csum_common(ptr, end, data);  in do_csum_with_alignment()
236 	unsigned long csum, data;  in do_csum_no_alignment()  local
240 	data = *(ptr++);  in do_csum_no_alignment()
245 	csum = do_csum_common(ptr, end, data);  in do_csum_no_alignment()
303  * Will do a light-weight address alignment if buff is misaligned, unless