2.9BSD/usr/net/sys/net/if_ec.c
/* if_ec.c 4.22 82/07/21 */
#include "ec.h"
/*
* 3Com Ethernet Controller interface
*/
#include "param.h"
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/buf.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/ubavar.h>
#include <sys/ecreg.h>
#include "../net/in.h"
#include "../net/in_systm.h"
#include "../net/if.h"
#include "../net/if_ec.h"
#include "../net/if_uba.h"
#include "../net/ip.h"
#include "../net/ip_var.h"
#include "../net/pup.h"
#include "../net/route.h"
#include <errno.h>
#define ECMTU 1500
#define ECMEM 0000000
int ecprobe(), ecattach(), ecrint(), ecxint(), eccollide();
struct uba_device *ecinfo[NEC];
u_short ecstd[] = { 0 };
struct uba_driver ecdriver =
{ ecprobe, 0, ecattach, 0, ecstd, "ec", ecinfo };
u_char ec_iltop[3] = { 0x02, 0x07, 0x01 };
#define ECUNIT(x) minor(x)
int ecinit(),ecoutput(),ecreset();
struct mbuf *ecget();
extern struct ifnet loif;
/*
* Ethernet software status per interface.
*
* Each interface is referenced by a network interface structure,
* es_if, which the routing code uses to locate the interface.
* This structure contains the output queue for the interface, its address, ...
* We also have, for each interface, a UBA interface structure, which
* contains information about the UNIBUS resources held by the interface:
* map registers, buffered data paths, etc. Information is cached in this
* structure for use by the if_uba.c routines in running the interface
* efficiently.
*/
struct ec_softc {
struct ifnet es_if; /* network-visible interface */
struct ifuba es_ifuba; /* UNIBUS resources */
short es_mask; /* mask for current output delay */
short es_oactive; /* is output active? */
caddr_t es_buf[16]; /* virtual addresses of buffers */
u_char es_enaddr[6]; /* board's ethernet address */
} ec_softc[NEC];
/*
* Do output DMA to determine interface presence and
* interrupt vector. DMA is too short to disturb other hosts.
*/
ecprobe(reg)
caddr_t reg;
{
register int br, cvec; /* r11, r10 value-result */
register struct ecdevice *addr = (struct ecdevice *)reg;
register caddr_t ecbuf = (caddr_t) &umem[numuba][ECMEM];
#ifdef lint
br = 0; cvec = br; br = cvec;
ecrint(0); ecxint(0); eccollide(0);
#endif
/*
* Make sure memory is turned on
*/
addr->ec_rcr = EC_AROM;
/*
* Disable map registers for ec unibus space,
* but don't allocate yet.
*/
ubamem(numuba, ECMEM, 32*2, 0);
/*
* Check for existence of buffers on Unibus.
*/
if (badaddr((caddr_t) ecbuf, 2)) {
bad1:
printf("ec: buffer mem not found\n");
bad2:
ubamem(numuba, 0, 0, 0); /* reenable map (780 only) */
addr->ec_rcr = EC_MDISAB; /* disable memory */
return (0);
}
#if VAX780
if (cpu == VAX_780 && uba_hd[numuba].uh_uba->uba_sr) {
uba_hd[numuba].uh_uba->uba_sr = uba_hd[numuba].uh_uba->uba_sr;
goto bad1;
}
#endif
/*
* Tell the system that the board has memory here, so it won't
* attempt to allocate the addresses later.
*/
if (ubamem(numuba, ECMEM, 32*2, 1) == 0) {
printf("ecprobe: cannot reserve uba addresses\n");
goto bad2;
}
/*
* Make a one byte packet in what should be buffer #0.
* Submit it for sending. This whould cause an xmit interrupt.
* The xmit interrupt vector is 8 bytes after the receive vector,
* so adjust for this before returning.
*/
*(u_short *)ecbuf = (u_short) 03777;
ecbuf[03777] = '\0';
addr->ec_xcr = EC_XINTEN|EC_XWBN;
DELAY(100000);
addr->ec_xcr = EC_XCLR;
if (cvec > 0 && cvec != 0x200) {
if (cvec & 04) { /* collision interrupt */
cvec -= 04;
br += 1; /* rcv is xmit + 1 */
} else { /* xmit interrupt */
cvec -= 010;
br += 2; /* rcv is xmit + 2 */
}
}
return (1);
}
/*
* Interface exists: make available by filling in network interface
* record. System will initialize the interface when it is ready
* to accept packets.
*/
ecattach(ui)
struct uba_device *ui;
{
struct ec_softc *es = &ec_softc[ui->ui_unit];
register struct ifnet *ifp = &es->es_if;
register struct ecdevice *addr = (struct ecdevice *)ui->ui_addr;
struct sockaddr_in *sin;
int i, j;
u_char *cp;
ifp->if_unit = ui->ui_unit;
ifp->if_name = "ec";
ifp->if_mtu = ECMTU;
ifp->if_net = ui->ui_flags;
/*
* Read the ethernet address off the board, one nibble at a time.
*/
addr->ec_xcr = EC_UECLR;
addr->ec_rcr = EC_AROM;
cp = es->es_enaddr;
#define NEXTBIT addr->ec_rcr = EC_AROM|EC_ASTEP; addr->ec_rcr = EC_AROM
for (i=0; i<6; i++) {
*cp = 0;
for (j=0; j<=4; j+=4) {
*cp |= ((addr->ec_rcr >> 8) & 0xf) << j;
NEXTBIT; NEXTBIT; NEXTBIT; NEXTBIT;
}
cp++;
}
#ifdef notdef
printf("ec%d: addr=%x:%x:%x:%x:%x:%x\n", ui->ui_unit,
es->es_enaddr[0]&0xff, es->es_enaddr[1]&0xff,
es->es_enaddr[2]&0xff, es->es_enaddr[3]&0xff,
es->es_enaddr[4]&0xff, es->es_enaddr[5]&0xff);
#endif
ifp->if_host[0] = ((es->es_enaddr[3]&0xff)<<16) |
((es->es_enaddr[4]&0xff)<<8) | (es->es_enaddr[5]&0xff);
sin = (struct sockaddr_in *)&es->es_if.if_addr;
sin->sin_family = AF_INET;
sin->sin_addr = if_makeaddr(ifp->if_net, ifp->if_host[0]);
sin = (struct sockaddr_in *)&ifp->if_broadaddr;
sin->sin_family = AF_INET;
sin->sin_addr = if_makeaddr(ifp->if_net, INADDR_ANY);
ifp->if_flags = IFF_BROADCAST;
ifp->if_init = ecinit;
ifp->if_output = ecoutput;
ifp->if_ubareset = ecreset;
for (i=0; i<16; i++)
es->es_buf[i] = &umem[ui->ui_ubanum][ECMEM+2048*i];
if_attach(ifp);
}
/*
* Reset of interface after UNIBUS reset.
* If interface is on specified uba, reset its state.
*/
ecreset(unit, uban)
int unit, uban;
{
register struct uba_device *ui;
if (unit >= NEC || (ui = ecinfo[unit]) == 0 || ui->ui_alive == 0 ||
ui->ui_ubanum != uban)
return;
printf(" ec%d", unit);
ubamem(uban, ECMEM, 32*2, 0); /* map register disable (no alloc) */
ecinit(unit);
}
/*
* Initialization of interface; clear recorded pending
* operations, and reinitialize UNIBUS usage.
*/
ecinit(unit)
int unit;
{
struct ec_softc *es = &ec_softc[unit];
struct ecdevice *addr;
int i, s;
/*
* Hang receive buffers and start any pending writes.
* Writing into the rcr also makes sure the memory
* is turned on.
*/
addr = (struct ecdevice *)ecinfo[unit]->ui_addr;
s = splimp();
for (i=ECRHBF; i>=ECRLBF; i--)
addr->ec_rcr = EC_READ|i;
es->es_oactive = 0;
es->es_mask = ~0;
es->es_if.if_flags |= IFF_UP;
if (es->es_if.if_snd.ifq_head)
ecstart(unit);
splx(s);
if_rtinit(&es->es_if, RTF_UP);
}
/*
* Start or restart output on interface.
* If interface is already active, then this is a retransmit
* after a collision, and just restuff registers.
* If interface is not already active, get another datagram
* to send off of the interface queue, and map it to the interface
* before starting the output.
*/
ecstart(dev)
dev_t dev;
{
int unit = ECUNIT(dev), dest;
struct ec_softc *es = &ec_softc[unit];
struct ecdevice *addr;
struct mbuf *m;
caddr_t ecbuf;
if (es->es_oactive)
goto restart;
IF_DEQUEUE(&es->es_if.if_snd, m);
if (m == 0) {
es->es_oactive = 0;
return;
}
ecput(es->es_buf[ECTBF], m);
restart:
addr = (struct ecdevice *)ecinfo[unit]->ui_addr;
addr->ec_xcr = EC_WRITE|ECTBF;
es->es_oactive = 1;
}
/*
* Ethernet interface transmitter interrupt.
* Start another output if more data to send.
*/
ecxint(unit)
int unit;
{
register struct ec_softc *es = &ec_softc[unit];
register struct ecdevice *addr =
(struct ecdevice *)ecinfo[unit]->ui_addr;
if (es->es_oactive == 0)
return;
if ((addr->ec_xcr&EC_XDONE) == 0 || (addr->ec_xcr&EC_XBN) != ECTBF) {
printf("ec%d: stray xmit interrupt, xcr=%b\n", unit,
addr->ec_xcr, EC_XBITS);
es->es_oactive = 0;
addr->ec_xcr = EC_XCLR;
return;
}
es->es_if.if_opackets++;
es->es_oactive = 0;
es->es_mask = ~0;
addr->ec_xcr = EC_XCLR;
if (es->es_if.if_snd.ifq_head)
ecstart(unit);
}
/*
* Collision on ethernet interface. Do exponential
* backoff, and retransmit. If have backed off all
* the way print warning diagnostic, and drop packet.
*/
eccollide(unit)
int unit;
{
struct ec_softc *es = &ec_softc[unit];
es->es_if.if_collisions++;
if (es->es_oactive)
ecdocoll(unit);
}
ecdocoll(unit)
int unit;
{
register struct ec_softc *es = &ec_softc[unit];
register struct ecdevice *addr =
(struct ecdevice *)ecinfo[unit]->ui_addr;
register i;
int delay;
/*
* Es_mask is a 16 bit number with n low zero bits, with
* n the number of backoffs. When es_mask is 0 we have
* backed off 16 times, and give up.
*/
if (es->es_mask == 0) {
es->es_if.if_oerrors++;
printf("ec%d: send error\n", unit);
/*
* Reset interface, then requeue rcv buffers.
* Some incoming packets may be lost, but that
* can't be helped.
*/
addr->ec_xcr = EC_UECLR;
for (i=ECRHBF; i>=ECRLBF; i--)
addr->ec_rcr = EC_READ|i;
/*
* Reset and transmit next packet (if any).
*/
es->es_oactive = 0;
es->es_mask = ~0;
if (es->es_if.if_snd.ifq_head)
ecstart(unit);
return;
}
/*
* Do exponential backoff. Compute delay based on low bits
* of the interval timer. Then delay for that number of
* slot times. A slot time is 51.2 microseconds (rounded to 51).
* This does not take into account the time already used to
* process the interrupt.
*/
es->es_mask <<= 1;
delay = mfpr(ICR) &~ es->es_mask;
DELAY(delay * 51);
/*
* Clear the controller's collision flag, thus enabling retransmit.
*/
addr->ec_xcr = EC_CLEAR;
}
/*
* Ethernet interface receiver interrupt.
* If input error just drop packet.
* Otherwise purge input buffered data path and examine
* packet to determine type. If can't determine length
* from type, then have to drop packet. Othewise decapsulate
* packet based on type and pass to type specific higher-level
* input routine.
*/
ecrint(unit)
int unit;
{
struct ecdevice *addr = (struct ecdevice *)ecinfo[unit]->ui_addr;
while (addr->ec_rcr & EC_RDONE)
ecread(unit);
}
ecread(unit)
int unit;
{
register struct ec_softc *es = &ec_softc[unit];
struct ecdevice *addr = (struct ecdevice *)ecinfo[unit]->ui_addr;
register struct ec_header *ec;
struct mbuf *m;
int len, off, resid, ecoff, buf;
register struct ifqueue *inq;
caddr_t ecbuf;
es->es_if.if_ipackets++;
buf = addr->ec_rcr & EC_RBN;
if (buf < ECRLBF || buf > ECRHBF)
panic("ecrint");
ecbuf = es->es_buf[buf];
ecoff = *(short *)ecbuf;
if (ecoff <= ECRDOFF || ecoff > 2046) {
es->es_if.if_ierrors++;
#ifdef notdef
if (es->es_if.if_ierrors % 100 == 0)
printf("ec%d: += 100 input errors\n", unit);
#endif
goto setup;
}
/*
* Get input data length.
* Get pointer to ethernet header (in input buffer).
* Deal with trailer protocol: if type is PUP trailer
* get true type from first 16-bit word past data.
* Remember that type was trailer by setting off.
*/
len = ecoff - ECRDOFF - sizeof (struct ec_header);
ec = (struct ec_header *)(ecbuf + ECRDOFF);
#define ecdataaddr(ec, off, type) ((type)(((caddr_t)((ec)+1)+(off))))
if (ec->ec_type >= ECPUP_TRAIL &&
ec->ec_type < ECPUP_TRAIL+ECPUP_NTRAILER) {
off = (ec->ec_type - ECPUP_TRAIL) * 512;
if (off >= ECMTU)
goto setup; /* sanity */
ec->ec_type = *ecdataaddr(ec, off, u_short *);
resid = *(ecdataaddr(ec, off+2, u_short *));
if (off + resid > len)
goto setup; /* sanity */
len = off + resid;
} else
off = 0;
if (len == 0)
goto setup;
/*
* Pull packet off interface. Off is nonzero if packet
* has trailing header; ecget will then force this header
* information to be at the front, but we still have to drop
* the type and length which are at the front of any trailer data.
*/
m = ecget(ecbuf, len, off);
if (m == 0)
goto setup;
if (off) {
m->m_off += 2 * sizeof (u_short);
m->m_len -= 2 * sizeof (u_short);
}
switch (ec->ec_type) {
#ifdef INET
case ECPUP_IPTYPE:
schednetisr(NETISR_IP);
inq = &ipintrq;
break;
#endif
default:
m_freem(m);
goto setup;
}
if (IF_QFULL(inq)) {
IF_DROP(inq);
m_freem(m);
goto setup;
}
IF_ENQUEUE(inq, m);
setup:
/*
* Reset for next packet.
*/
addr->ec_rcr = EC_READ|EC_RCLR|buf;
}
/*
* Ethernet output routine.
* Encapsulate a packet of type family for the local net.
* Use trailer local net encapsulation if enough data in first
* packet leaves a multiple of 512 bytes of data in remainder.
* If destination is this address or broadcast, send packet to
* loop device to kludge around the fact that 3com interfaces can't
* talk to themselves.
*/
ecoutput(ifp, m0, dst)
struct ifnet *ifp;
struct mbuf *m0;
struct sockaddr *dst;
{
int type, dest, s, error;
register struct ec_softc *es = &ec_softc[ifp->if_unit];
register struct mbuf *m = m0;
register struct ec_header *ec;
register int off, i;
struct mbuf *mcopy = (struct mbuf *) 0; /* Null */
switch (dst->sa_family) {
#ifdef INET
case AF_INET:
dest = ((struct sockaddr_in *)dst)->sin_addr.s_addr;
if ((dest &~ 0xff) == 0)
mcopy = m_copy(m, 0, M_COPYALL);
else if (dest == ((struct sockaddr_in *)&es->es_if.if_addr)->
sin_addr.s_addr) {
mcopy = m;
goto gotlocal;
}
off = ntohs((u_short)mtod(m, struct ip *)->ip_len) - m->m_len;
if (off > 0 && (off & 0x1ff) == 0 &&
m->m_off >= MMINOFF + 2 * sizeof (u_short)) {
type = ECPUP_TRAIL + (off>>9);
m->m_off -= 2 * sizeof (u_short);
m->m_len += 2 * sizeof (u_short);
*mtod(m, u_short *) = ECPUP_IPTYPE;
*(mtod(m, u_short *) + 1) = m->m_len;
goto gottrailertype;
}
type = ECPUP_IPTYPE;
off = 0;
goto gottype;
#endif
default:
printf("ec%d: can't handle af%d\n", ifp->if_unit,
dst->sa_family);
error = EAFNOSUPPORT;
goto bad;
}
gottrailertype:
/*
* Packet to be sent as trailer: move first packet
* (control information) to end of chain.
*/
while (m->m_next)
m = m->m_next;
m->m_next = m0;
m = m0->m_next;
m0->m_next = 0;
m0 = m;
gottype:
/*
* Add local net header. If no space in first mbuf,
* allocate another.
*/
if (m->m_off > MMAXOFF ||
MMINOFF + sizeof (struct ec_header) > m->m_off) {
m = m_get(M_DONTWAIT);
if (m == 0) {
error = ENOBUFS;
goto bad;
}
m->m_next = m0;
m->m_off = MMINOFF;
m->m_len = sizeof (struct ec_header);
} else {
m->m_off -= sizeof (struct ec_header);
m->m_len += sizeof (struct ec_header);
}
ec = mtod(m, struct ec_header *);
for (i=0; i<6; i++)
ec->ec_shost[i] = es->es_enaddr[i];
if ((dest &~ 0xff) == 0)
/* broadcast address */
for (i=0; i<6; i++)
ec->ec_dhost[i] = 0xff;
else {
if (dest & 0x8000) {
ec->ec_dhost[0] = ec_iltop[0];
ec->ec_dhost[1] = ec_iltop[1];
ec->ec_dhost[2] = ec_iltop[2];
} else {
ec->ec_dhost[0] = es->es_enaddr[0];
ec->ec_dhost[1] = es->es_enaddr[1];
ec->ec_dhost[2] = es->es_enaddr[2];
}
ec->ec_dhost[3] = (dest>>8) & 0x7f;
ec->ec_dhost[4] = (dest>>16) & 0xff;
ec->ec_dhost[5] = (dest>>24) & 0xff;
}
ec->ec_type = type;
/*
* Queue message on interface, and start output if interface
* not yet active.
*/
s = splimp();
if (IF_QFULL(&ifp->if_snd)) {
IF_DROP(&ifp->if_snd);
error = ENOBUFS;
goto qfull;
}
IF_ENQUEUE(&ifp->if_snd, m);
if (es->es_oactive == 0)
ecstart(ifp->if_unit);
splx(s);
gotlocal:
return(mcopy ? looutput(&loif, mcopy, dst) : 0);
qfull:
m0 = m;
splx(s);
bad:
m_freem(m0);
return(error);
}
/*
* Routine to copy from mbuf chain to transmitter
* buffer in UNIBUS memory.
*/
ecput(ecbuf, m)
u_char *ecbuf;
struct mbuf *m;
{
register struct mbuf *mp;
register int off;
u_char *bp;
for (off = 2048, mp = m; mp; mp = mp->m_next)
off -= mp->m_len;
*(u_short *)ecbuf = off;
bp = (u_char *)(ecbuf + off);
for (mp = m; mp; mp = mp->m_next) {
register unsigned len = mp->m_len;
u_char *mcp;
if (len == 0)
continue;
mcp = mtod(mp, u_char *);
if ((unsigned)bp & 01) {
*bp++ = *mcp++;
len--;
}
if (off = (len >> 1)) {
register u_short *to, *from;
to = (u_short *)bp;
from = (u_short *)mcp;
do
*to++ = *from++;
while (--off > 0);
bp = (u_char *)to,
mcp = (u_char *)from;
}
if (len & 01)
*bp++ = *mcp++;
}
#ifdef notdef
if (bp - ecbuf != 2048)
printf("ec: bad ecput, diff=%d\n", bp-ecbuf);
#endif
m_freem(m);
}
/*
* Routine to copy from UNIBUS memory into mbufs.
* Similar in spirit to if_rubaget.
*
* Warning: This makes the fairly safe assumption that
* mbufs have even lengths.
*/
struct mbuf *
ecget(ecbuf, totlen, off0)
u_char *ecbuf;
int totlen, off0;
{
register struct mbuf *m;
struct mbuf *top = 0, **mp = ⊤
register int off = off0, len;
u_char *cp;
cp = ecbuf + ECRDOFF + sizeof (struct ec_header);
while (totlen > 0) {
register int words;
u_char *mcp;
MGET(m, 0);
if (m == 0)
goto bad;
if (off) {
len = totlen - off;
cp = ecbuf + ECRDOFF + sizeof (struct ec_header) + off;
} else
len = totlen;
if (len >= CLBYTES) {
struct mbuf *p;
MCLGET(p, 1);
if (p != 0) {
m->m_len = len = CLBYTES;
m->m_off = (int)p - (int)m;
} else {
m->m_len = len = MIN(MLEN, len);
m->m_off = MMINOFF;
}
} else {
m->m_len = len = MIN(MLEN, len);
m->m_off = MMINOFF;
}
mcp = mtod(m, u_char *);
if (words = (len >> 1)) {
register u_short *to, *from;
to = (u_short *)mcp;
from = (u_short *)cp;
do
*to++ = *from++;
while (--words > 0);
mcp = (u_char *)to;
cp = (u_char *)from;
}
if (len & 01)
*mcp++ = *cp++;
*mp = m;
mp = &m->m_next;
if (off == 0) {
totlen -= len;
continue;
}
off += len;
if (off == totlen) {
cp = ecbuf + ECRDOFF + sizeof (struct ec_header);
off = 0;
totlen = off0;
}
}
return (top);
bad:
m_freem(top);
return (0);
}