1 // SPDX-License-Identifier: GPL-2.0
3  * csum_partial_copy - do IP checksumming and copy
7  *	Rick Gorton	<rick.gorton@alpha-processor.com>
9  * Don't look at this too closely - you'll go mad. The things
88 	unsigned long carry = 0;  in csum_partial_cfu_aligned()  local
94 		checksum += carry;  in csum_partial_cfu_aligned()
97 		len -= 8;  in csum_partial_cfu_aligned()
98 		carry = checksum < word;  in csum_partial_cfu_aligned()
103 	checksum += carry;  in csum_partial_cfu_aligned()
112 		carry = checksum < word;  in csum_partial_cfu_aligned()
114 		checksum += carry;  in csum_partial_cfu_aligned()
120  * This is even less fun, but this is still reasonably
130 	unsigned long word, carry;  in csum_partial_cfu_dest_aligned()  local
136 	carry = 0;  in csum_partial_cfu_dest_aligned()
143 		len -= 8;  in csum_partial_cfu_dest_aligned()
146 		checksum += carry;  in csum_partial_cfu_dest_aligned()
152 		carry = checksum < word;  in csum_partial_cfu_dest_aligned()
155 	checksum += carry;  in csum_partial_cfu_dest_aligned()
168 		carry = checksum < word;  in csum_partial_cfu_dest_aligned()
170 		checksum += carry;  in csum_partial_cfu_dest_aligned()
176  * This is slightly less fun than the above..
185 	unsigned long carry = 0;  in csum_partial_cfu_src_aligned()  local
194 		len -= 8;  in csum_partial_cfu_src_aligned()
196 		checksum += carry;  in csum_partial_cfu_src_aligned()
201 		carry = checksum < word;  in csum_partial_cfu_src_aligned()
206 		checksum += carry;  in csum_partial_cfu_src_aligned()
210 		len -= 8;  in csum_partial_cfu_src_aligned()
214 		carry = checksum < word;  in csum_partial_cfu_src_aligned()
228 	checksum += carry;  in csum_partial_cfu_src_aligned()
233  * This is so totally un-fun that it's frightening. Don't
242 	unsigned long carry = 0;  in csum_partial_cfu_unaligned()  local
258 		checksum += carry;  in csum_partial_cfu_unaligned()
259 		len -= 8;  in csum_partial_cfu_unaligned()
267 		carry = checksum < word;  in csum_partial_cfu_unaligned()
272 	checksum += carry;  in csum_partial_cfu_unaligned()
283 		mskql(word, len-doff, word);  in csum_partial_cfu_unaligned()
286 		carry = checksum < word;  in csum_partial_cfu_unaligned()
294 		checksum += carry;  in csum_partial_cfu_unaligned()
305 		mskql(word, len-doff, word);  in csum_partial_cfu_unaligned()
308 		carry = checksum < word;  in csum_partial_cfu_unaligned()
311 		checksum += carry;  in csum_partial_cfu_unaligned()
326 				(unsigned long *) dst, len-8);  in __csum_and_copy()
331 				soff, len-8);  in __csum_and_copy()
339 				doff, len-8, partial_dest);  in __csum_and_copy()
344 				soff, doff, len-8, partial_dest);  in __csum_and_copy()