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Add a new sack hint to track the most recent and highest sacked sequence number.

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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
This commit is contained in:
Lawrence Stewart 2010-12-28 03:27:20 +00:00
parent 22968a7d56
commit bee9ab2bc5
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=216753
2 changed files with 2 additions and 0 deletions
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1
sys/netinet/tcp_sack.c
View File

@ -425,6 +425,7 @@ tcp_sack_doack(struct tcpcb *tp, struct tcpopt *to, tcp_seq th_ack)
* are received.
*/
sblkp = &sack_blocks[num_sack_blks - 1]; /* Last SACK block */
tp->sackhint.last_sack_ack = sblkp->end;
if (SEQ_LT(tp->snd_fack, sblkp->start)) {
/*
* The highest SACK block is beyond fack. Append new SACK

1
sys/netinet/tcp_var.h
View File

@ -70,6 +70,7 @@ struct sackhole {
struct sackhint {
struct sackhole *nexthole;
int sack_bytes_rexmit;
tcp_seq last_sack_ack; /* Most recent/largest sacked ack */
int ispare; /* explicit pad for 64bit alignment */
uint64_t _pad[2]; /* 1 sacked_bytes, 1 TBD */