Make it possible to set MTU via "ifconfig" at run time. "SLMTU" is now
used to set the initial value.
This commit is contained in:
parent
77597ecd3e
commit
bbee1b42b1
|
@ -1,4 +1,4 @@
|
|||
/* $NetBSD: if_sl.c,v 1.53 1998/10/06 18:38:08 kleink Exp $ */
|
||||
/* $NetBSD: if_sl.c,v 1.54 1999/03/25 00:52:14 tron Exp $ */
|
||||
|
||||
/*
|
||||
* Copyright (c) 1987, 1989, 1992, 1993
|
||||
|
@ -283,17 +283,17 @@ slopen(dev, tp)
|
|||
* make sure tty output queue is large enough
|
||||
* to hold a full-sized packet (including frame
|
||||
* end, and a possible extra frame end). full-sized
|
||||
* packet occupies a max of 2*SLMTU bytes (because
|
||||
* packet occupies a max of 2*SLMAX bytes (because
|
||||
* of possible escapes), and add two on for frame
|
||||
* ends.
|
||||
*/
|
||||
s = spltty();
|
||||
if (tp->t_outq.c_cn < 2*SLMTU+2) {
|
||||
if (tp->t_outq.c_cn < 2*SLMAX+2) {
|
||||
sc->sc_oldbufsize = tp->t_outq.c_cn;
|
||||
sc->sc_oldbufquot = tp->t_outq.c_cq != 0;
|
||||
|
||||
clfree(&tp->t_outq);
|
||||
error = clalloc(&tp->t_outq, 3*SLMTU, 0);
|
||||
error = clalloc(&tp->t_outq, 2*SLMAX+2, 0);
|
||||
if (error) {
|
||||
splx(s);
|
||||
return(error);
|
||||
|
@ -457,12 +457,15 @@ slstart(tp)
|
|||
int s;
|
||||
struct mbuf *m2;
|
||||
#if NBPFILTER > 0
|
||||
u_char bpfbuf[SLMTU + SLIP_HDRLEN];
|
||||
u_char *bpfbuf;
|
||||
register int len = 0;
|
||||
#endif
|
||||
#ifndef __NetBSD__ /* XXX - cgd */
|
||||
extern int cfreecount;
|
||||
#endif
|
||||
#if NBPFILTER > 0
|
||||
MALLOC(bpfbuf, u_char *, SLMAX + SLIP_HDRLEN, M_DEVBUF, M_NOWAIT);
|
||||
#endif
|
||||
|
||||
for (;;) {
|
||||
/*
|
||||
|
@ -472,24 +475,30 @@ slstart(tp)
|
|||
*/
|
||||
if (tp->t_outq.c_cc != 0) {
|
||||
(*tp->t_oproc)(tp);
|
||||
if (tp->t_outq.c_cc > SLIP_HIWAT)
|
||||
if (tp->t_outq.c_cc > SLIP_HIWAT) {
|
||||
if (bpfbuf != NULL) FREE(bpfbuf, M_DEVBUF);
|
||||
return;
|
||||
}
|
||||
}
|
||||
/*
|
||||
* This happens briefly when the line shuts down.
|
||||
*/
|
||||
if (sc == NULL)
|
||||
if (sc == NULL) {
|
||||
if (bpfbuf != NULL) FREE(bpfbuf, M_DEVBUF);
|
||||
return;
|
||||
}
|
||||
|
||||
#ifdef __NetBSD__ /* XXX - cgd */
|
||||
/*
|
||||
* Do not remove the packet from the IP queue if it
|
||||
* doesn't look like the packet will fit into the
|
||||
* current serial output queue, with a packet full of
|
||||
* escapes this could be as bad as SLMTU*2+2.
|
||||
* escapes this could be as bad as MTU*2+2.
|
||||
*/
|
||||
if (tp->t_outq.c_cn - tp->t_outq.c_cc < 2*SLMTU+2)
|
||||
if (tp->t_outq.c_cn - tp->t_outq.c_cc < 2*sc->sc_if.if_mtu+2) {
|
||||
if (bpfbuf != NULL) FREE(bpfbuf, M_DEVBUF);
|
||||
return;
|
||||
}
|
||||
#endif /* __NetBSD__ */
|
||||
|
||||
/*
|
||||
|
@ -502,8 +511,10 @@ slstart(tp)
|
|||
else
|
||||
IF_DEQUEUE(&sc->sc_if.if_snd, m);
|
||||
splx(s);
|
||||
if (m == NULL)
|
||||
if (m == NULL) {
|
||||
if (bpfbuf != NULL) FREE(bpfbuf, M_DEVBUF);
|
||||
return;
|
||||
}
|
||||
|
||||
/*
|
||||
* We do the header compression here rather than in sloutput
|
||||
|
@ -512,7 +523,7 @@ slstart(tp)
|
|||
* munged when this happens.
|
||||
*/
|
||||
#if NBPFILTER > 0
|
||||
if (sc->sc_bpf) {
|
||||
if (sc->sc_bpf && bpfbuf != NULL) {
|
||||
/*
|
||||
* We need to save the TCP/IP header before it's
|
||||
* compressed. To avoid complicated code, we just
|
||||
|
@ -540,7 +551,7 @@ slstart(tp)
|
|||
&sc->sc_comp, 1);
|
||||
}
|
||||
#if NBPFILTER > 0
|
||||
if (sc->sc_bpf) {
|
||||
if (sc->sc_bpf && bpfbuf != NULL) {
|
||||
/*
|
||||
* Put the SLIP pseudo-"link header" in place. The
|
||||
* compressed header is now at the beginning of the
|
||||
|
@ -879,8 +890,9 @@ slioctl(ifp, cmd, data)
|
|||
caddr_t data;
|
||||
{
|
||||
register struct ifaddr *ifa = (struct ifaddr *)data;
|
||||
register struct ifreq *ifr;
|
||||
register struct ifreq *ifr = (struct ifreq *)data;
|
||||
register int s = splimp(), error = 0;
|
||||
register struct sl_softc *sc = ifp->if_softc;
|
||||
|
||||
switch (cmd) {
|
||||
|
||||
|
@ -896,9 +908,20 @@ slioctl(ifp, cmd, data)
|
|||
error = EAFNOSUPPORT;
|
||||
break;
|
||||
|
||||
case SIOCSIFMTU:
|
||||
if ((ifr->ifr_mtu < 3) || (ifr->ifr_mtu > SLMAX)) {
|
||||
error = EINVAL;
|
||||
break;
|
||||
}
|
||||
sc->sc_if.if_mtu = ifr->ifr_mtu;
|
||||
break;
|
||||
|
||||
case SIOCGIFMTU:
|
||||
ifr->ifr_mtu = sc->sc_if.if_mtu;
|
||||
break;
|
||||
|
||||
case SIOCADDMULTI:
|
||||
case SIOCDELMULTI:
|
||||
ifr = (struct ifreq *)data;
|
||||
if (ifr == 0) {
|
||||
error = EAFNOSUPPORT; /* XXX */
|
||||
break;
|
||||
|
|
Loading…
Reference in New Issue