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The slip driver used to allocate a mbuf cluster without attaching

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it to a mbuf. This patch makes it attach it to mbuf.  This patch
is in preperation for Bosko Milekic's mbuf external reference
counting patches.

PR:		19866 (first stage)
Submitted by:	Ian Dowse <iedowse@maths.tcd.ie>
Reviewed by:	alfred
This commit is contained in:
David Malone 2000-08-18 08:02:31 +00:00
parent fb8ee6537c
commit 432b948f76
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=64808
2 changed files with 22 additions and 9 deletions
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30
sys/net/if_sl.c
View file

@ -251,20 +251,28 @@ slcreate()
{
struct sl_softc *sc, *nc;
int unit;
caddr_t p;
struct mbuf *m;
MALLOC(sc, struct sl_softc *, sizeof(*sc), M_SL, M_WAITOK);
bzero(sc, sizeof *sc);
MCLALLOC(p, M_WAIT);
if (p)
sc->sc_ep = (u_char *)p + SLBUFSIZE;
else {
m = m_gethdr(M_WAIT, MT_DATA);
if (m != NULL) {
MCLGET(m, M_WAIT);
if ((m->m_flags & M_EXT) == 0) {
m_free(m);
m = NULL;
}
}
if (m == NULL) {
printf("sl: can't allocate buffer\n");
FREE(sc, M_SL);
return (NULL);
}
sc->sc_ep = mtod(m, u_char *) + SLBUFSIZE;
sc->sc_mbuf = m;
sc->sc_buf = sc->sc_ep - SLRMAX;
sc->sc_mp = sc->sc_buf;
sl_compress_init(&sc->sc_comp, -1);
@ -365,7 +373,7 @@ sldestroy(struct sl_softc *sc) {
bpfdetach(&sc->sc_if);
if_detach(&sc->sc_if);
LIST_REMOVE(sc, sl_next);
MCLFREE((caddr_t)(sc->sc_ep - SLBUFSIZE));
m_free(sc->sc_mbuf);
FREE(sc, M_SL);
}
@ -768,7 +776,7 @@ sl_btom(sc, len)
register struct sl_softc *sc;
register int len;
{
register struct mbuf *m;
struct mbuf *m, *newm;
MGETHDR(m, M_DONTWAIT, MT_DATA);
if (m == NULL)
@ -791,9 +799,13 @@ sl_btom(sc, len)
(void) m_free(m);
return (NULL);
}
sc->sc_ep = mtod(m, u_char *) + SLBUFSIZE;
/* Swap the new and old clusters */
newm = m;
m = sc->sc_mbuf;
sc->sc_mbuf = newm;
sc->sc_ep = mtod(newm, u_char *) + SLBUFSIZE;
m->m_data = (caddr_t)sc->sc_buf;
m->m_ext.ext_buf = (caddr_t)((intptr_t)sc->sc_buf &~ MCLOFSET);
} else
bcopy((caddr_t)sc->sc_buf, mtod(m, caddr_t), len);

1
sys/net/if_slvar.h
View file

@ -50,6 +50,7 @@ struct sl_softc {
struct ifnet sc_if; /* network-visible interface */
struct ifqueue sc_fastq; /* interactive output queue */
struct tty *sc_ttyp; /* pointer to tty structure */
struct mbuf *sc_mbuf; /* pointer to mbuf containing buffer */
u_char *sc_mp; /* pointer to next available buf char */
u_char *sc_ep; /* pointer to last available buf char */
u_char *sc_buf; /* input buffer */