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Only allocate teh 1540 byte buffer if we need it..

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(lazy allocation)

MFC after:	13 days
This commit is contained in:
Julian Elischer 2001-08-16 17:16:31 +00:00
parent cb41bad03f
commit 50624012be
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=81787
1 changed files with 18 additions and 18 deletions
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36
sys/net/if_sl.c
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@ -264,13 +264,6 @@ slcreate()
struct mbuf *m;
MALLOC(sc, struct sl_softc *, sizeof(*sc), M_SL, M_WAITOK | M_ZERO);
if (!sc)
return (NULL);
MALLOC(sc->bpfbuf, u_char *, SLTMAX + SLIP_HDRLEN, M_SL, M_NOWAIT);
if (!sc->bpfbuf) {
FREE(sc, M_SL);
return (NULL);
}
m = m_gethdr(M_TRYWAIT, MT_DATA);
if (m != NULL) {
@ -283,7 +276,6 @@ slcreate()
if (m == NULL) {
printf("sl: can't allocate buffer\n");
FREE(sc->bpfbuf, M_SL);
FREE(sc, M_SL);
return (NULL);
}
@ -394,7 +386,8 @@ sldestroy(struct sl_softc *sc)
LIST_REMOVE(sc, sl_next);
m_free(sc->sc_mbuf);
mtx_destroy(&sc->sc_fastq.ifq_mtx);
FREE(sc->bpfbuf, M_SL);
if (sc->bpfbuf)
FREE(sc->bpfbuf, M_SL);
FREE(sc, M_SL);
}
@ -661,16 +654,23 @@ slstart(tp)
* to the packet transmission time).
*/
register struct mbuf *m1 = m;
register u_char *cp = sc->bpfbuf + SLIP_HDRLEN;
register u_char *cp;
len = 0;
do {
register int mlen = m1->m_len;
if (sc->bpfbuf == NULL)
MALLOC(sc->bpfbuf, u_char *,
SLTMAX + SLIP_HDRLEN, M_SL, M_NOWAIT);
bcopy(mtod(m1, caddr_t), cp, mlen);
cp += mlen;
len += mlen;
} while ((m1 = m1->m_next) != NULL);
if (sc->bpfbuf) {
cp = sc->bpfbuf + SLIP_HDRLEN;
len = 0;
do {
register int mlen = m1->m_len;
bcopy(mtod(m1, caddr_t), cp, mlen);
cp += mlen;
len += mlen;
} while ((m1 = m1->m_next) != NULL);
}
}
ip = mtod(m, struct ip *);
if (ip->ip_v == IPVERSION && ip->ip_p == IPPROTO_TCP) {
@ -678,7 +678,7 @@ slstart(tp)
*mtod(m, u_char *) |= sl_compress_tcp(m, ip,
&sc->sc_comp, 1);
}
if (sc->sc_if.if_bpf) {
if (sc->sc_if.if_bpf && sc->bpfbuf) {
/*
* Put the SLIP pseudo-"link header" in place. The
* compressed header is now at the beginning of the