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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:
tron 1999-03-25 00:52:14 +00:00
parent 77597ecd3e
commit bbee1b42b1
1 changed files with 37 additions and 14 deletions
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51
sys/net/if_sl.c
View File

@ -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;