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Make tcp_drain() actually do something. When invoked (usually as a

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desperation measure in low-memory situations), walk the tcpbs and
flush the reassembly queues.

This behaviour is currently controlled by the debug.do_tcpdrain sysctl
(defaults to on).

Submitted by:	Bosko Milekic <bmilekic@dsuper.net>
Reviewed by:	wollman
This commit is contained in:
Mike Smith 1999-12-28 23:18:33 +00:00
parent 983d57fe35
commit 052a6aad2c
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=55198
2 changed files with 58 additions and 0 deletions
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29
sys/netinet/tcp_subr.c
View File

@ -100,6 +100,10 @@ static int tcp_tcbhashsize = 0;
SYSCTL_INT(_net_inet_tcp, OID_AUTO, tcbhashsize, CTLFLAG_RD,
&tcp_tcbhashsize, 0, "Size of TCP control-block hashtable");
static int do_tcpdrain = 1;
SYSCTL_INT(_debug, OID_AUTO, do_tcpdrain, CTLFLAG_RW, &do_tcpdrain, 0,
"Enable non Net3 compliant tcp_drain");
SYSCTL_INT(_net_inet_tcp, OID_AUTO, pcbcount, CTLFLAG_RD,
&tcbinfo.ipi_count, 0, "Number of active PCBs");
@ -503,7 +507,32 @@ tcp_close(tp)
void
tcp_drain()
{
if (do_tcpdrain)
{
struct inpcb *inpb;
struct tcpcb *tcpb;
struct mbuf *m, *mq;
/*
* Walk the tcpbs, if existing, and flush the reassembly queue,
* if there is one...
* XXX: The "Net/3" implementation doesn't imply that the TCP
* reassembly queue should be flushed, but in a situation
* where we're really low on mbufs, this is potentially
* usefull.
*/
for (inpb = tcbinfo.listhead->lh_first; inpb;
inpb = inpb->inp_list.le_next) {
if ((tcpb = intotcpcb(inpb))) {
for (mq = tcpb->t_segq; mq; mq = m) {
m = mq->m_nextpkt;
tcpb->t_segq = m;
m_freem(mq);
}
}
}
}
}
/*

29
sys/netinet/tcp_timewait.c
View File

@ -100,6 +100,10 @@ static int tcp_tcbhashsize = 0;
SYSCTL_INT(_net_inet_tcp, OID_AUTO, tcbhashsize, CTLFLAG_RD,
&tcp_tcbhashsize, 0, "Size of TCP control-block hashtable");
static int do_tcpdrain = 1;
SYSCTL_INT(_debug, OID_AUTO, do_tcpdrain, CTLFLAG_RW, &do_tcpdrain, 0,
"Enable non Net3 compliant tcp_drain");
SYSCTL_INT(_net_inet_tcp, OID_AUTO, pcbcount, CTLFLAG_RD,
&tcbinfo.ipi_count, 0, "Number of active PCBs");
@ -503,7 +507,32 @@ tcp_close(tp)
void
tcp_drain()
{
if (do_tcpdrain)
{
struct inpcb *inpb;
struct tcpcb *tcpb;
struct mbuf *m, *mq;
/*
* Walk the tcpbs, if existing, and flush the reassembly queue,
* if there is one...
* XXX: The "Net/3" implementation doesn't imply that the TCP
* reassembly queue should be flushed, but in a situation
* where we're really low on mbufs, this is potentially
* usefull.
*/
for (inpb = tcbinfo.listhead->lh_first; inpb;
inpb = inpb->inp_list.le_next) {
if ((tcpb = intotcpcb(inpb))) {
for (mq = tcpb->t_segq; mq; mq = m) {
m = mq->m_nextpkt;
tcpb->t_segq = m;
m_freem(mq);
}
}
}
}
}
/*