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Code Issues Releases Activity

Parallel-port TCP/IP interface can now take any MTU.

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This commit is contained in:
Poul-Henning Kamp 1994-09-18 06:12:45 +00:00
parent 240baf2f68
commit 0999b624b0
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=2847
1 changed files with 73 additions and 62 deletions
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87
sys/i386/isa/lpt.c
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@ -46,7 +46,7 @@
* SUCH DAMAGE.
*
* from: unknown origin, 386BSD 0.1
* $Id: lpt.c,v 1.17 1994/09/03 22:47:02 csgr Exp $
* $Id: lpt.c,v 1.18 1994/09/15 02:37:11 phk Exp $
*/
/*
@ -155,6 +155,7 @@
#endif
#define LPHDR 2 /* We send 0x08, 0x00 in front of packet */
#endif /* INET */
/* BIOS printer list - used by BIOS probe*/
@ -197,7 +198,7 @@ struct lpt_softc {
#ifdef INET
struct ifnet sc_if;
u_char sc_ifbuf[LPMTU+LPHDR];
u_char *sc_ifbuf;
int sc_iferrs;
#endif /* ENDIF */
@ -234,14 +235,14 @@ void lptintr (int unit);
#ifdef INET
/* Tables for the lp# interface */
static unsigned char txmith[1024];
static u_char *txmith;
#define txmitl (txmith+256)
#define trecvh (txmith+512)
#define trecvl (txmith+768)
/* Functions for the lp# interface */
static void lpattach(struct lpt_softc *,int);
static void lpinittables();
static int lpinittables();
static int lpioctl(struct ifnet *, int, caddr_t);
static int lpoutput(struct ifnet *, struct mbuf *, struct sockaddr *,
struct rtentry *);
@ -808,23 +809,29 @@ lpattach(struct lpt_softc *sc,int unit)
ifp->if_addrlen = 0;
ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
if_attach(ifp);
printf("lp%d: TCP/IP interface, MTU=%d.\n",unit,LPMTU);
printf("lp%d: TCP/IP interface\n",unit);
}
/*
* We don't want to calculate these nasties in our tight loop, so we
* precalculate them when we initialize.
*/
static void
static int
lpinittables()
{
int i;
if(!txmith)
txmith = malloc(1024,M_DEVBUF,M_NOWAIT);
if(!txmith)
return 1;
for(i=0;i<256;i++) {
txmith[i] = ((i & 0x80) >> 3) | ((i & 0x70) >> 4) | 0x08;
txmitl[i] = ((i & 0x08) << 1) | (i & 0x07);
trecvh[i] = ((~i) & 0x80) | ((i & 0x38) << 1);
trecvl[i] = (((~i) & 0x80) >> 4) | ((i & 0x38) >> 3);
}
return 0;
}
/*
@ -838,43 +845,43 @@ lpioctl(struct ifnet *ifp, int cmd, caddr_t data)
struct lpt_softc *sc = lpt_sc + ifp->if_unit;
struct ifaddr *ifa = (struct ifaddr *)data;
struct ifreq *ifr = (struct ifreq *)data;
int error = 0;
u_char *ptr;
switch (cmd) {
case SIOCSIFDSTADDR:
case SIOCAIFADDR:
case SIOCSIFADDR:
if (ifa->ifa_addr->sa_family != AF_INET)
return EAFNOSUPPORT;
ifp->if_flags |= IFF_UP;
/* FALLTHROUGH */
case SIOCSIFFLAGS:
if (((ifp->if_flags & IFF_UP) == 0) &&
(ifp->if_flags & IFF_RUNNING)) {
if ((!(ifp->if_flags & IFF_UP)) && (ifp->if_flags & IFF_RUNNING)) {
outb(sc->sc_port+2, 0x00);
ifp->if_flags &= ~IFF_RUNNING;
break;
}
if (((ifp->if_flags & IFF_UP)) &&
((ifp->if_flags & IFF_RUNNING) == 0)) {
lpinittables();
if (((ifp->if_flags & IFF_UP)) && (!(ifp->if_flags & IFF_RUNNING))) {
if(lpinittables())
return ENOBUFS;
sc->sc_ifbuf = malloc(ifr->ifr_metric+LPHDR,M_DEVBUF,M_NOWAIT);
if(!sc->sc_ifbuf)
return ENOBUFS;
outb(sc->sc_port+2, 0x10);
ifp->if_flags |= IFF_RUNNING;
}
break;
case SIOCAIFADDR:
case SIOCSIFADDR:
if (ifa->ifa_addr->sa_family != AF_INET)
error = EAFNOSUPPORT;
lpinittables();
outb(sc->sc_port+2, 0x10);
ifp->if_flags |= IFF_RUNNING | IFF_UP;
break;
case SIOCSIFDSTADDR:
if (ifa->ifa_addr->sa_family != AF_INET)
error = EAFNOSUPPORT;
break;
case SIOCSIFMTU:
if ((error = suser(p->p_ucred, &p->p_acflag)))
return (error);
if(ifr->ifr_metric > LPMTU)
error = EINVAL;
ptr = sc->sc_ifbuf;
sc->sc_ifbuf = malloc(ifr->ifr_metric+LPHDR,M_DEVBUF,M_NOWAIT);
if(!sc->sc_ifbuf) {
sc->sc_ifbuf = ptr;
return ENOBUFS;
}
free(ptr,M_DEVBUF);
sc->sc_if.if_mtu = ifr->ifr_metric;
break;
@ -884,9 +891,9 @@ lpioctl(struct ifnet *ifp, int cmd, caddr_t data)
default:
lprintf("LP:ioctl%x\n",cmd);
error = EINVAL;
return EINVAL;
}
return (error);
return 0;
}
static void
@ -894,13 +901,16 @@ lpintr(int unit)
{
struct lpt_softc *sc = lpt_sc + unit;
int len,s,j;
register const int port = sc->sc_port+1;
const int port = sc->sc_port+1;
u_char *bp;
s = splimp();
while((inb(port)&0x40)) {
{
u_long c, cl;
for(len=0;len<LPMTU+LPHDR;) {
len = sc->sc_if.if_mtu + LPHDR;
bp = sc->sc_ifbuf;
while(len--) {
__asm __volatile("
inb %%dx,%%al
movzbl %%al,%0
@ -922,7 +932,7 @@ lpintr(int unit)
outb %%al,%%dx
incl %%edx
" : "=b" (c) : "d" (port) : "a");
sc->sc_ifbuf[len++] = trecvh[cl] | trecvl[c];
*bp++= trecvh[cl] | trecvl[c];
{
j = LPMAXSPIN2;
while(!((cl=inb(port)) & 0x40)) {
@ -934,6 +944,7 @@ lpintr(int unit)
}
}
end:
len = bp - sc->sc_ifbuf;
if(len <= LPHDR)
goto err;
@ -948,8 +959,8 @@ lpintr(int unit)
sc->sc_if.if_ipackets++;
sc->sc_if.if_ibytes += len;
{
u_char *p = sc->sc_ifbuf+LPHDR;
struct mbuf *top, *m, *m2;
bp = sc->sc_ifbuf+LPHDR;
MGETHDR(m, M_DONTWAIT, MT_DATA);
top = m;
m->m_len=0;
@ -964,10 +975,10 @@ lpintr(int unit)
m->m_len=0;
m2->m_next = m;
j = min(len,M_TRAILINGSPACE(m));
bcopy(p, mtod(m, caddr_t), j);
bcopy(bp, mtod(m, caddr_t), j);
m->m_len=j;
len -= j;
p += j;
bp += j;
}
IF_ENQUEUE(&ipintrq, top);
schednetisr(NETISR_IP);