mirror of
https://github.com/openvswitch/ovs
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d6c1bc0dcb
These two functions are really simple, to the point that inlining them yields less code than calling them: with GCC 4.9 on i386, this change reduces the code generated for packet_csum_pseudoheader() from 112 bytes to 100 bytes. I didn't measure whether there is a performance improvement. Signed-off-by: Ben Pfaff <blp@ovn.org> Acked-by: Thadeu Lima de Souza Cascardo <cascardo@redhat.com>
58 lines
2.1 KiB
C
58 lines
2.1 KiB
C
/*
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* Copyright (c) 2008, 2011, 2015 Nicira, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef CSUM_H
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#define CSUM_H 1
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#include <stddef.h>
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#include <stdint.h>
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#include "openvswitch/types.h"
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ovs_be16 csum(const void *, size_t);
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uint32_t csum_continue(uint32_t partial, const void *, size_t);
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ovs_be16 csum_finish(uint32_t partial);
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ovs_be16 recalc_csum16(ovs_be16 old_csum, ovs_be16 old_u16, ovs_be16 new_u16);
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ovs_be16 recalc_csum32(ovs_be16 old_csum, ovs_be32 old_u32, ovs_be32 new_u32);
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ovs_be16 recalc_csum48(ovs_be16 old_csum, const struct eth_addr old_mac,
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const struct eth_addr new_mac);
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ovs_be16 recalc_csum128(ovs_be16 old_csum, ovs_16aligned_be32 old_u32[4],
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const ovs_be32 new_u32[4]);
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#ifndef __CHECKER__
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/* Adds the 16 bits in 'new' to the partial IP checksum 'partial' and returns
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* the updated checksum. (To start a new checksum, pass 0 for 'partial'. To
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* obtain the finished checksum, pass the return value to csum_finish().) */
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static inline uint32_t
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csum_add16(uint32_t partial, ovs_be16 new)
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{
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return partial + new;
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}
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/* Adds the 32 bits in 'new' to the partial IP checksum 'partial' and returns
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* the updated checksum. (To start a new checksum, pass 0 for 'partial'. To
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* obtain the finished checksum, pass the return value to csum_finish().) */
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static inline uint32_t
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csum_add32(uint32_t partial, ovs_be32 new)
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{
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return partial + (new >> 16) + (new & 0xffff);
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}
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#else
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uint32_t csum_add16(uint32_t partial, ovs_be16);
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uint32_t csum_add32(uint32_t partial, ovs_be32);
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#endif
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#endif /* csum.h */
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