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devpnc.h: expand listen backlog for big rings, use TCP_DEFER_ACCEPT so

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Linux holds onto connections until the uid is sent.  Otherwise, the
delay between making a connection and sending the uid will be larger
than MAXACCCEPTTIME, causing large rings to fail
This commit is contained in:
Jim 2020-02-27 11:53:07 -05:00
parent bf3c1a3df2
commit 120079666f
1 changed files with 14 additions and 2 deletions
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16
devpnc.h
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@ -295,7 +295,7 @@ static struct { /* node info for each node in my network */
#define PNCCSNONE 0 /* not configured in ring.cfg */
#define PNCCSDISC 1 /* not connected */
#define PNCCSCONN 2 /* connected */
#define PNCCSCONN 2 /* connecting */
#define PNCCSAUTH 3 /* unique ID / password sent */
/* xmit/recv buffer states and buffers. These must be static because
@ -983,10 +983,22 @@ int devpnc (int class, int func, int device) {
perror("bind: unable to bind for PNC");
fatal(NULL);
}
if (listen(pncfd, 10)) {
if (listen(pncfd, MAXNODEID)) {
perror("listen failed for PNC");
fatal(NULL);
}
/* a uid is always sent after a connect, so don't bother with the
accept until the uid is received. This is Linux-specific and
can be disabled, though that may cause problems for rings where
the max node id > MAXACCEPTTIME because of connect delays */
optval = MAXNODEID;
if (setsockopt(pncfd, IPPROTO_TCP, TCP_DEFER_ACCEPT, &optval, sizeof(optval))) {
perror("setsockopt TCP_DEFER_ACCEPT failed for PNC");
fatal(NULL);
}
TRACE(T_RIO, "PNC configured\n");
devpoll[device] = PNCPOLL*gvp->instpermsec;