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#ifndef __sack_filter_h__
#define __sack_filter_h__
/*-
* Copyright (c) 2017-9 Netflix, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* Seven entry's is carefully choosen to
* fit in one cache line. We can easily
* change this to 15 (but it gets very
* little extra filtering). To change it
* to be larger than 15 would require either
* sf_bits becoming a uint32_t and then you
* could go to 31.. or change it to a full
* bitstring.. It is really doubtful you
* will get much benefit beyond 7, in testing
* there was a small amount but very very small.
*/
#define SACK_FILTER_BLOCKS 7
struct sack_filter {
tcp_seq sf_ack;
uint16_t sf_bits;
uint8_t sf_cur;
uint8_t sf_used;
struct sackblk sf_blks[SACK_FILTER_BLOCKS];
};
#ifdef _KERNEL
void sack_filter_clear(struct sack_filter *sf, tcp_seq seq);
int sack_filter_blks(struct sack_filter *sf, struct sackblk *in, int numblks,
tcp_seq th_ack);
void sack_filter_reject(struct sack_filter *sf, struct sackblk *in);
static inline uint8_t sack_filter_blks_used(struct sack_filter *sf)
{
return (sf->sf_used);
}
#endif
#endif
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