Add a new sack hint to track the most recent and highest sacked sequence number.
This will be used by the incoming Enhanced RTT Khelp module. Sponsored by: FreeBSD Foundation Submitted by: David Hayes <dahayes at swin edu au> Reviewed by: bz and others (as part of a larger patch) MFC after: 3 months
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svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=216753
@ -425,6 +425,7 @@ tcp_sack_doack(struct tcpcb *tp, struct tcpopt *to, tcp_seq th_ack)
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* are received.
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*/
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sblkp = &sack_blocks[num_sack_blks - 1]; /* Last SACK block */
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tp->sackhint.last_sack_ack = sblkp->end;
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if (SEQ_LT(tp->snd_fack, sblkp->start)) {
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/*
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* The highest SACK block is beyond fack. Append new SACK
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@ -70,6 +70,7 @@ struct sackhole {
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struct sackhint {
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struct sackhole *nexthole;
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int sack_bytes_rexmit;
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tcp_seq last_sack_ack; /* Most recent/largest sacked ack */
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int ispare; /* explicit pad for 64bit alignment */
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uint64_t _pad[2]; /* 1 sacked_bytes, 1 TBD */
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