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-rw-r--r--arch/arm64/include/asm/checksum.h51
1 files changed, 51 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/checksum.h b/arch/arm64/include/asm/checksum.h
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+++ b/arch/arm64/include/asm/checksum.h
@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) 2016 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_CHECKSUM_H
+#define __ASM_CHECKSUM_H
+
+#include <linux/types.h>
+
+static inline __sum16 csum_fold(__wsum csum)
+{
+ u32 sum = (__force u32)csum;
+ sum += (sum >> 16) | (sum << 16);
+ return ~(__force __sum16)(sum >> 16);
+}
+#define csum_fold csum_fold
+
+static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl)
+{
+ __uint128_t tmp;
+ u64 sum;
+
+ tmp = *(const __uint128_t *)iph;
+ iph += 16;
+ ihl -= 4;
+ tmp += ((tmp >> 64) | (tmp << 64));
+ sum = tmp >> 64;
+ do {
+ sum += *(const u32 *)iph;
+ iph += 4;
+ } while (--ihl);
+
+ sum += ((sum >> 32) | (sum << 32));
+ return csum_fold(sum >> 32);
+}
+#define ip_fast_csum ip_fast_csum
+
+#include <asm-generic/checksum.h>
+
+#endif /* __ASM_CHECKSUM_H */