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mateuszvis |
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/*!\file netinet/tcp_scor.h
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* TCP scoreboard definitions (SACK).
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*/
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/*
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* Copyright (c) 1997, Pittsburgh Supercomputing Center,
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* Jamshid Mahdavi, Matt Mathis, Jeffrey Semke
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* All rights reserved.
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*
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* Permission to use, copy, modify, and distribute this software and
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* its documentation for any purpose and without fee is hereby granted,
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* provided that the above copyright notice appear in all copies and
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* that both that copyright notice and this permission notice appear
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* in supporting documentation.
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*
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* This is experimental software under active development and may
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* potentially contain bugs. Use at your own risk.
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*
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*/
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#ifndef __NETINET_TCP_SCOREBOARD_H
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#define __NETINET_TCP_SCOREBOARD_H
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/**********************************************************************
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*
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* Scoreboard module headers:
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*
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**********************************************************************/
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/* Initialize the scoreboard
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*/
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#define scrb_init(tp) { LIST_INIT(&((tp)->scrb.head)); \
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(tp)->scrb.last_ack=(tp)->snd_una; \
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(tp)->snd_retran_data = 0; }
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/*
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* Check to see if the scoreboard is empty
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* scrb_isempty(struct tcpcp *tp)
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*/
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#define scrb_isempty(tp) (! ((tp)->scrb.scrb_head))
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/* This macro quickly takes care of the common case of an empty
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* scoreboard. Otherwise it called scrb_getnextretran_func to hunt
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* through the scoreboard and return the next block of data to be
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* retransmitted. The start and end of the block are filled in to
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* start_ptr and end_ptr, and the length of the block is returned. A
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* zero return value indicates that there is no data to be
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* retransmitted at this time. Note that end_ptr actually points to
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* the first byte of data which is NOT to be retransmitted (or the
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* first byte following the data to be retransmitted) similar in
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* fashion to the rest of this code.
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*
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* scrb_getnextretran(struct tcpcp *tp, tcp_seq *start, tcp_seq *end)
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*/
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#define scrb_getnextretran(tp,start,end) \
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(scrb_isempty(tp) ? \
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(int)((tcp_seq*)*start = (tcp_seq*)*end = \
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(tcp_seq*)0) \
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: scrb_getnextretran_func(tp,start,end))
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/* sender side -- tracks packets sent that WERE selectively acknowledged
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* by the other end.
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* Each sb_entry represents a hole (missing data) followed by
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* consecutive received data.
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*/
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struct scrb_entry {
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LIST_ENTRY(scrb_entry) ptrs; /* Next/Prev structure pointers */
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tcp_seq start; /* Start of received data block */
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tcp_seq end; /* End of received data block */
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tcp_seq retran; /* End of subsequent data
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retransmitted */
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tcp_seq snd_max; /* Value of snd_max at the time of
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retransmission */
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int sack_cnt; /* FACK ONLY: Number of reports for
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this hole */
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};
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#define scrb_next ptrs.le_next /* next element */
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#define scrb_prev ptrs.le_prev /* previous element */
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/* sender side -- tracks packets sent that were selectively
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* acknowledged by the other end
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*/
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struct scoreboard {
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tcp_seq last_ack; /* This value replicates snd_una,
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but is needed for internal
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scoreboard state. */
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LIST_HEAD(scrb_head_internal, scrb_entry) head; /* Scoreboard list */
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};
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#define scrb_head head.lh_first /* first element of scoreboard */
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/* return codes from routines that might have to clear the scoreboard
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*/
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#define E_SCRB_CLEAR -1
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#define E_SCRB_NOERR 0
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/* reason parameters for scrb_clear
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*/
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#define SCRB_INIT 0
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#define SCRB_RENEGE 1
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#define SCRB_NOMEM 2
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#define SCRB_TIMEOUT 3
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#endif /* __NETINET_TCP_SCOREBOARD_H */
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