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Remove 2 (SACK) fields from the tcpcb. These are only used by a

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function that is called from tcp_input(), so they oughta be passed on
the stack instead of stuck in the tcpcb.

Submitted by:	Mohan Srinivasan
This commit is contained in:
Paul Saab 2005-02-17 23:04:56 +00:00
parent 348c9a5668
commit 7643c37cf2
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=142031
4 changed files with 13 additions and 20 deletions
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7
sys/netinet/tcp_input.c
View File

@ -2295,11 +2295,8 @@ tcp_input(m, off0)
thflags = tcp_reass(tp, th, &tlen, m);
tp->t_flags |= TF_ACKNOW;
}
if (tp->sack_enable) {
tp->rcv_laststart = th->th_seq; /* last recv'd segment*/
tp->rcv_lastend = th->th_seq + tlen;
tcp_update_sack_list(tp);
}
if (tp->sack_enable)
tcp_update_sack_list(tp, th->th_seq, th->th_seq + tlen);
/*
* Note the amount of data that peer has sent into
* our window, in order to estimate the sender's

7
sys/netinet/tcp_reass.c
View File

@ -2295,11 +2295,8 @@ tcp_input(m, off0)
thflags = tcp_reass(tp, th, &tlen, m);
tp->t_flags |= TF_ACKNOW;
}
if (tp->sack_enable) {
tp->rcv_laststart = th->th_seq; /* last recv'd segment*/
tp->rcv_lastend = th->th_seq + tlen;
tcp_update_sack_list(tp);
}
if (tp->sack_enable)
tcp_update_sack_list(tp, th->th_seq, th->th_seq + tlen);
/*
* Note the amount of data that peer has sent into
* our window, in order to estimate the sender's

15
sys/netinet/tcp_sack.c
View File

@ -175,8 +175,9 @@ TUNABLE_INT("net.inet.tcp.sack.enable", &tcp_do_sack);
* prediction mode), and it updates the ordered list of sacks.
*/
void
tcp_update_sack_list(tp)
tcp_update_sack_list(tp, rcv_laststart, rcv_lastend)
struct tcpcb *tp;
tcp_seq rcv_laststart, rcv_lastend;
{
/*
* First reported block MUST be the most recent one. Subsequent
@ -206,10 +207,10 @@ tcp_update_sack_list(tp)
tp->rcv_numsacks -= count;
if (tp->rcv_numsacks == 0) { /* no sack blocks currently (fast path) */
tcp_clean_sackreport(tp);
if (SEQ_LT(tp->rcv_nxt, tp->rcv_laststart)) {
if (SEQ_LT(tp->rcv_nxt, rcv_laststart)) {
/* ==> need first sack block */
tp->sackblks[0].start = tp->rcv_laststart;
tp->sackblks[0].end = tp->rcv_lastend;
tp->sackblks[0].start = rcv_laststart;
tp->sackblks[0].end = rcv_lastend;
tp->rcv_numsacks = 1;
}
return;
@ -217,14 +218,14 @@ tcp_update_sack_list(tp)
/* Otherwise, sack blocks are already present. */
for (i = 0; i < tp->rcv_numsacks; i++)
tp->sackblks[i] = temp[i]; /* first copy back sack list */
if (SEQ_GEQ(tp->rcv_nxt, tp->rcv_lastend))
if (SEQ_GEQ(tp->rcv_nxt, rcv_lastend))
return; /* sack list remains unchanged */
/*
* From here, segment just received should be (part of) the 1st sack.
* Go through list, possibly coalescing sack block entries.
*/
firstsack.start = tp->rcv_laststart;
firstsack.end = tp->rcv_lastend;
firstsack.start = rcv_laststart;
firstsack.end = rcv_lastend;
for (i = 0; i < tp->rcv_numsacks; i++) {
sack = tp->sackblks[i];
if (SEQ_LT(sack.end, firstsack.start) ||

4
sys/netinet/tcp_var.h
View File

@ -187,8 +187,6 @@ struct tcpcb {
int sack_enable; /* enable SACK for this connection */
int snd_numholes; /* number of holes seen by sender */
struct sackhole *snd_holes; /* linked list of holes (sorted) */
tcp_seq rcv_laststart; /* start of last segment recd. */
tcp_seq rcv_lastend; /* end of ... */
tcp_seq rcv_lastsack; /* last seq number(+1) sack'd by rcv'r*/
int rcv_numsacks; /* # distinct sack blks present */
struct sackblk sackblks[MAX_SACK_BLKS]; /* seq nos. of sack blocks */
@ -575,7 +573,7 @@ extern u_long tcp_recvspace;
tcp_seq tcp_new_isn(struct tcpcb *);
int tcp_sack_option(struct tcpcb *,struct tcphdr *,u_char *,int);
void tcp_update_sack_list(struct tcpcb *tp);
void tcp_update_sack_list(struct tcpcb *tp, tcp_seq rcv_laststart, tcp_seq rcv_lastend);
void tcp_del_sackholes(struct tcpcb *, struct tcphdr *);
void tcp_clean_sackreport(struct tcpcb *tp);
void tcp_sack_adjust(struct tcpcb *tp);