From c80a34b56f0b3e92bfaf491d9f43f7e4e36eb086 Mon Sep 17 00:00:00 2001 From: "William F. Jolitz" Date: Tue, 14 Jul 1992 18:40:23 -0800 Subject: [PATCH] 386BSD 0.1 development Work on file usr/src/sys.386bsd/i386/isa/if_ne.c Co-Authored-By: Lynne Greer Jolitz Synthesized-from: 386BSD-0.1 --- usr/src/sys.386bsd/i386/isa/if_ne.c | 855 ++++++++++++++++++++++++++++ 1 file changed, 855 insertions(+) create mode 100644 usr/src/sys.386bsd/i386/isa/if_ne.c diff --git a/usr/src/sys.386bsd/i386/isa/if_ne.c b/usr/src/sys.386bsd/i386/isa/if_ne.c new file mode 100644 index 0000000000..e1a6c78f9a --- /dev/null +++ b/usr/src/sys.386bsd/i386/isa/if_ne.c @@ -0,0 +1,855 @@ +/*- + * Copyright (c) 1990, 1991 William F. Jolitz. + * Copyright (c) 1990 The Regents of the University of California. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * @(#)if_ne.c 7.4 (Berkeley) 5/21/91 + */ + +/* + * NE2000 Ethernet driver + * + * Parts inspired from Tim Tucker's if_wd driver for the wd8003, + * insight on the ne2000 gained from Robert Clements PC/FTP driver. + */ + +#include "ne.h" +#if NNE > 0 + +#include "param.h" +#include "systm.h" +#include "mbuf.h" +#include "buf.h" +#include "protosw.h" +#include "socket.h" +#include "ioctl.h" +#include "errno.h" +#include "syslog.h" + +#include "net/if.h" +#include "net/netisr.h" +#include "net/route.h" + +#ifdef INET +#include "netinet/in.h" +#include "netinet/in_systm.h" +#include "netinet/in_var.h" +#include "netinet/ip.h" +#include "netinet/if_ether.h" +#endif + +#ifdef NS +#include "netns/ns.h" +#include "netns/ns_if.h" +#endif + +#include "i386/isa/isa_device.h" +#include "i386/isa/if_nereg.h" +#include "i386/isa/icu.h" + +int neprobe(), neattach(), neintr(); +int nestart(),neinit(), ether_output(), neioctl(); + +struct isa_driver nedriver = { + neprobe, neattach, "ne", +}; + +struct mbuf *neget(); + +#define ETHER_MIN_LEN 64 +#define ETHER_MAX_LEN 1536 + +/* + * Ethernet software status per interface. + * + * Each interface is referenced by a network interface structure, + * ns_if, which the routing code uses to locate the interface. + * This structure contains the output queue for the interface, its address, ... + */ +struct ne_softc { + struct arpcom ns_ac; /* Ethernet common part */ +#define ns_if ns_ac.ac_if /* network-visible interface */ +#define ns_addr ns_ac.ac_enaddr /* hardware Ethernet address */ + int ns_flags; +#define DSF_LOCK 1 /* block re-entering enstart */ + int ns_oactive ; + int ns_mask ; + int ns_ba; /* byte addr in buffer ram of inc pkt */ + int ns_cur; /* current page being filled */ + struct prhdr ns_ph; /* hardware header of incoming packet*/ + struct ether_header ns_eh; /* header of incoming packet */ + u_char ns_pb[2048 /*ETHERMTU+sizeof(long)*/]; + short ns_txstart; /* transmitter buffer start */ + short ns_rxend; /* recevier buffer end */ + short ns_rxbndry; /* recevier buffer boundary */ + short ns_port; /* i/o port base */ + short ns_mode; /* word/byte mode */ +} ne_softc[NNE] ; +#define ENBUFSIZE (sizeof(struct ether_header) + ETHERMTU + 2 + ETHER_MIN_LEN) + +#define PAT(n) (0xa55a + 37*(n)) + +u_short boarddata[16]; + +neprobe(dvp) + struct isa_device *dvp; +{ + int val, i, s, sum, bytemode = 1, pat; + register struct ne_softc *ns = &ne_softc[0]; + register nec; + +#ifdef lint + neintr(0); +#endif + + nec = ns->ns_port = dvp->id_iobase; + s = splimp(); + + if (bytemode) { + /* Byte Transfers, Burst Mode Select, Fifo at 8 bytes */ + ns->ns_mode = DSDC_BMS|DSDC_FT1; + ns->ns_txstart = TBUF8; + ns->ns_rxend = RBUFEND8; + } else { +word: + /* Word Transfers, Burst Mode Select, Fifo at 8 bytes */ + ns->ns_mode = DSDC_WTS|DSDC_BMS|DSDC_FT1; + ns->ns_txstart = TBUF16; + ns->ns_rxend = RBUFEND16; + bytemode = 0; + } + + /* Reset the bastard */ + val = inb(nec + ne_reset); + DELAY(200); + outb(nec + ne_reset, val); + DELAY(200); + + outb(nec + ds_cmd, DSCM_STOP|DSCM_NODMA); + + i = 10000; + while ((inb(nec + ds0_isr) & DSIS_RESET) == 0 && i-- > 0); + if (i < 0) return (0); + + outb(nec + ds0_isr, 0xff); + outb(nec + ds0_dcr, ns->ns_mode); + outb(nec + ds_cmd, DSCM_NODMA|DSCM_PG0|DSCM_STOP); + DELAY(1000); + + /* Check cmd reg and fail if not right */ + if ((i = inb(nec + ds_cmd)) != (DSCM_NODMA|DSCM_PG0|DSCM_STOP)) + return(0); + + outb(nec + ds0_tcr, 0); + outb(nec + ds0_rcr, DSRC_MON); + outb(nec + ds0_pstart, (ns->ns_txstart+PKTSZ)/DS_PGSIZE); + outb(nec + ds0_pstop, ns->ns_rxend/DS_PGSIZE); + outb(nec + ds0_bnry, ns->ns_rxend/DS_PGSIZE); + outb(nec + ds0_imr, 0); + outb(nec + ds0_isr, 0); + outb(nec + ds_cmd, DSCM_NODMA|DSCM_PG1|DSCM_STOP); + outb(nec + ds1_curr, (ns->ns_txstart+PKTSZ)/DS_PGSIZE); + outb(nec + ds_cmd, DSCM_NODMA|DSCM_PG0|DSCM_STOP); + + +#ifdef NEDEBUG +#define RCON 37 + { int i, rom; + + rom=1; + printf("ne ram "); + + for (i = 0; i < 0xfff0; i+=4) { + pat = PAT(i); + neput(ns, &pat,i,4); + nefetch(ns, &pat,i,4); + if (pat == PAT(i)) { + if (rom) { + rom=0; + printf(" %x", i); + } + } else { + if (!rom) { + rom=1; + printf("..%x ", i); + } + } + pat=0; + neput(ns, &pat,i,4); + } + printf("\n"); + } +#endif + + /* + * detect difference between units + * solely by where the RAM is decoded. + */ + pat = PAT(0); + neput(ns, &pat, ns->ns_txstart, 4); + nefetch(ns, &pat, ns->ns_txstart, 4); + if (pat != PAT(0)) { + if (bytemode) + goto word; + else return (0); + } + + + /* Extract board address */ + nefetch (ns, (caddr_t)boarddata, 0, sizeof(boarddata)); + + for(i=0; i < 6; i++) + ns->ns_addr[i] = boarddata[i]; + splx(s); + return (1); +} + +/* + * Fetch from onboard ROM/RAM + */ +nefetch (ns, up, ad, len) struct ne_softc *ns; caddr_t up; { + u_char cmd; + register nec = ns->ns_port; + int counter = 100000; + + cmd = inb (nec + ds_cmd); + outb (nec + ds_cmd, DSCM_NODMA|DSCM_PG0|DSCM_START); + + /* Setup remote dma */ + outb (nec + ds0_isr, DSIS_RDC); + + if ((ns->ns_mode & DSDC_WTS) && len&1) + len++; /* roundup to words */ + + outb (nec+ds0_rbcr0, len); + outb (nec+ds0_rbcr1, len>>8); + outb (nec+ds0_rsar0, ad); + outb (nec+ds0_rsar1, ad>>8); + + /* Execute & extract from card */ + outb (nec+ds_cmd, DSCM_RREAD|DSCM_PG0|DSCM_START); + + if (ns->ns_mode & DSDC_WTS) + insw (nec+ne_data, up, len/2); + else + insb (nec+ne_data, up, len); + + /* Wait till done, then shutdown feature */ + while ((inb (nec+ds0_isr) & DSIS_RDC) == 0 && counter-- > 0) + ; + outb (nec+ds0_isr, DSIS_RDC); + outb (nec+ds_cmd, cmd); +} + +/* + * Put to onboard RAM + */ +neput (ns, up, ad, len) struct ne_softc *ns; caddr_t up; { + u_char cmd; + register nec = ns->ns_port; + int counter = 100000; + + cmd = inb(nec+ds_cmd); + outb (nec+ds_cmd, DSCM_NODMA|DSCM_PG0|DSCM_START); + + /* Setup for remote dma */ + outb (nec+ds0_isr, DSIS_RDC); + + if ((ns->ns_mode & DSDC_WTS) && len&1) + len++; /* roundup to words */ + + outb (nec+ds0_rbcr0, len); + outb (nec+ds0_rbcr1, len>>8); + outb (nec+ds0_rsar0, ad); + outb (nec+ds0_rsar1, ad>>8); + + /* Execute & stuff to card */ + outb (nec+ds_cmd, DSCM_RWRITE|DSCM_PG0|DSCM_START); + if (ns->ns_mode & DSDC_WTS) + outsw (nec+ne_data, up, len/2); + else + outsb (nec+ne_data, up, len); + + /* Wait till done, then shutdown feature */ + while ((inb (nec+ds0_isr) & DSIS_RDC) == 0 && counter-- > 0) + ; + outb (nec+ds0_isr, DSIS_RDC); + outb (nec+ds_cmd, cmd); +} + +/* + * Reset of interface. + */ +nereset(unit, uban) + int unit, uban; +{ + if (unit >= NNE) + return; + printf("ne%d: reset\n", unit); + ne_softc[unit].ns_flags &= ~DSF_LOCK; + neinit(unit); +} + +/* + * Interface exists: make available by filling in network interface + * record. System will initialize the interface when it is ready + * to accept packets. We get the ethernet address here. + */ +neattach(dvp) + struct isa_device *dvp; +{ + int unit = dvp->id_unit; + register struct ne_softc *ns = &ne_softc[unit]; + register struct ifnet *ifp = &ns->ns_if; + + ifp->if_unit = unit; + ifp->if_name = nedriver.name ; + ifp->if_mtu = ETHERMTU; + printf (" ethernet address %s", ether_sprintf(ns->ns_addr)) ; + ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_NOTRAILERS; + ifp->if_init = neinit; + ifp->if_output = ether_output; + ifp->if_start = nestart; + ifp->if_ioctl = neioctl; + ifp->if_reset = nereset; + ifp->if_watchdog = 0; + if_attach(ifp); +} + +/* + * Initialization of interface; set up initialization block + * and transmit/receive descriptor rings. + */ +neinit(unit) + int unit; +{ + register struct ne_softc *ns = &ne_softc[unit]; + struct ifnet *ifp = &ns->ns_if; + int s; + int i; char *cp; + register nec = ns->ns_port; + + if (ifp->if_addrlist == (struct ifaddr *)0) return; + if (ifp->if_flags & IFF_RUNNING) return; + + s = splimp(); + + /* set physical address on ethernet */ + outb (nec+ds_cmd, DSCM_NODMA|DSCM_PG1|DSCM_STOP); + for (i=0 ; i < 6 ; i++) outb(nec+ds1_par0+i,ns->ns_addr[i]); + + /* clr logical address hash filter for now */ + for (i=0 ; i < 8 ; i++) outb(nec+ds1_mar0+i,0xff); + + /* init regs */ + outb (nec+ds_cmd, DSCM_NODMA|DSCM_PG0|DSCM_STOP); + outb (nec+ds0_rbcr0, 0); + outb (nec+ds0_rbcr1, 0); + outb (nec+ds0_imr, 0); + outb (nec+ds0_isr, 0xff); + + /* Word Transfer select, Burst Mode Select, Fifo at 8 bytes */ + outb(nec+ds0_dcr, ns->ns_mode); + + outb(nec+ds0_tcr, 0); + outb (nec+ds0_rcr, DSRC_MON); + outb (nec+ds0_tpsr, 0); + outb(nec+ds0_pstart, (ns->ns_txstart+PKTSZ)/DS_PGSIZE); + outb(nec+ds0_pstop, ns->ns_rxend/DS_PGSIZE); + outb(nec+ds0_bnry, (ns->ns_txstart+PKTSZ)/DS_PGSIZE); + outb (nec+ds_cmd, DSCM_NODMA|DSCM_PG1|DSCM_STOP); + outb(nec+ds1_curr, (ns->ns_txstart+PKTSZ)/DS_PGSIZE); + ns->ns_cur = (ns->ns_txstart+PKTSZ)/DS_PGSIZE; + outb (nec+ds_cmd, DSCM_NODMA|DSCM_PG0|DSCM_START); + outb (nec+ds0_rcr, DSRC_AB); + outb(nec+ds0_dcr, ns->ns_mode); + outb (nec+ds0_imr, 0xff); + + ns->ns_if.if_flags |= IFF_RUNNING; + ns->ns_flags &= ~DSF_LOCK; + ns->ns_oactive = 0; ns->ns_mask = ~0; + nestart(ifp); + splx(s); +} + +/* + * Setup output on interface. + * Get another datagram to send off of the interface queue, + * and map it to the interface before starting the output. + * called only at splimp or interrupt level. + */ +nestart(ifp) + struct ifnet *ifp; +{ + register struct ne_softc *ns = &ne_softc[ifp->if_unit]; + struct mbuf *m0, *m; + int buffer; + int len = 0, i, total,t; + register nec = ns->ns_port; + + /* + * The DS8390 has only one transmit buffer, if it is busy we + * must wait until the transmit interrupt completes. + */ + outb(nec+ds_cmd,DSCM_NODMA|DSCM_START); + + if (ns->ns_flags & DSF_LOCK) + return; + + if (inb(nec+ds_cmd) & DSCM_TRANS) + return; + + if ((ns->ns_if.if_flags & IFF_RUNNING) == 0) + return; + + IF_DEQUEUE(&ns->ns_if.if_snd, m); + + if (m == 0) + return; + + /* + * Copy the mbuf chain into the transmit buffer + */ + + ns->ns_flags |= DSF_LOCK; /* prevent entering nestart */ + buffer = ns->ns_txstart; len = i = 0; + t = 0; + for (m0 = m; m != 0; m = m->m_next) + t += m->m_len; + + m = m0; + total = t; + for (m0 = m; m != 0; ) { + + if (m->m_len&1 && t > m->m_len) { + neput(ns, mtod(m, caddr_t), buffer, m->m_len - 1); + t -= m->m_len - 1; + buffer += m->m_len - 1; + m->m_data += m->m_len - 1; + m->m_len = 1; + m = m_pullup(m, 2); + } else { + neput(ns, mtod(m, caddr_t), buffer, m->m_len); + buffer += m->m_len; + t -= m->m_len; + MFREE(m, m0); + m = m0; + } + } + + /* + * Init transmit length registers, and set transmit start flag. + */ + + len = total; + if (len < ETHER_MIN_LEN) len = ETHER_MIN_LEN; + outb(nec+ds0_tbcr0,len&0xff); + outb(nec+ds0_tbcr1,(len>>8)&0xff); + outb(nec+ds0_tpsr, ns->ns_txstart/DS_PGSIZE); + outb(nec+ds_cmd, DSCM_TRANS|DSCM_NODMA|DSCM_START); +} + +/* buffer successor/predecessor in ring? */ +#define succ(n) (((n)+1 >= ns->ns_rxend/DS_PGSIZE) ? (ns->ns_txstart+PKTSZ)/DS_PGSIZE : (n)+1) +#define pred(n) (((n)-1 < (ns->ns_txstart+PKTSZ)/DS_PGSIZE) ? ns->ns_rxend/DS_PGSIZE-1 : (n)-1) + +/* + * Controller interrupt. + */ +neintr(unit) +{ + register struct ne_softc *ns = &ne_softc[unit]; + u_char cmd,isr; + register nec = ns->ns_port; + + /* Save cmd, clear interrupt */ + cmd = inb (nec+ds_cmd); +loop: + isr = inb (nec+ds0_isr); + outb(nec+ds_cmd,DSCM_NODMA|DSCM_START); + outb(nec+ds0_isr, isr); + + /* Receiver error */ + if (isr & DSIS_RXE) { + /* need to read these registers to clear status */ + (void) inb(nec+ ds0_rsr); + (void) inb(nec+ 0xD); + (void) inb(nec + 0xE); + (void) inb(nec + 0xF); + ns->ns_if.if_ierrors++; + } + + /* We received something; rummage thru tiny ring buffer */ + if (isr & (DSIS_RX|DSIS_RXE|DSIS_ROVRN)) { + u_char pend,lastfree; + + outb(nec+ds_cmd, DSCM_START|DSCM_NODMA|DSCM_PG1); + pend = inb(nec+ds1_curr); + outb(nec+ds_cmd, DSCM_START|DSCM_NODMA|DSCM_PG0); + lastfree = inb(nec+ds0_bnry); + + /* Have we wrapped? */ + if (lastfree >= ns->ns_rxend/DS_PGSIZE) + lastfree = (ns->ns_txstart+PKTSZ)/DS_PGSIZE; + if (pend < lastfree && ns->ns_cur < pend) + lastfree = ns->ns_cur; + else if (ns->ns_cur > lastfree) + lastfree = ns->ns_cur; + + /* Something in the buffer? */ + while (pend != lastfree) { + u_char nxt; + + /* Extract header from microcephalic board */ + nefetch(ns, &ns->ns_ph,lastfree*DS_PGSIZE, + sizeof(ns->ns_ph)); + ns->ns_ba = lastfree*DS_PGSIZE+sizeof(ns->ns_ph); + + /* Incipient paranoia */ + if (ns->ns_ph.pr_status == DSRS_RPC || + /* for dequna's */ + ns->ns_ph.pr_status == 0x21) + nerecv (ns); +#ifdef NEDEBUG + else { + printf("cur %x pnd %x lfr %x ", + ns->ns_cur, pend, lastfree); + printf("nxt %x len %x ", ns->ns_ph.pr_nxtpg, + (ns->ns_ph.pr_sz1<<8)+ ns->ns_ph.pr_sz0); + printf("Bogus Sts %x\n", ns->ns_ph.pr_status); + } +#endif + + nxt = ns->ns_ph.pr_nxtpg ; + + /* Sanity check */ + if ( nxt >= (ns->ns_txstart+PKTSZ)/DS_PGSIZE + && nxt <= ns->ns_rxend/DS_PGSIZE && nxt <= pend) + ns->ns_cur = nxt; + else ns->ns_cur = nxt = pend; + + /* Set the boundaries */ + lastfree = nxt; + outb(nec+ds0_bnry, pred(nxt)); + outb(nec+ds_cmd, DSCM_START|DSCM_NODMA|DSCM_PG1); + pend = inb(nec+ds1_curr); + outb(nec+ds_cmd, DSCM_START|DSCM_NODMA|DSCM_PG0); + } + outb(nec+ds_cmd, DSCM_START|DSCM_NODMA); + } + + /* Transmit error */ + if (isr & DSIS_TXE) { + ns->ns_flags &= ~DSF_LOCK; + /* Need to read these registers to clear status */ + ns->ns_if.if_collisions += inb(nec+ds0_tbcr0); + ns->ns_if.if_oerrors++; + } + + /* Packet Transmitted */ + if (isr & DSIS_TX) { + ns->ns_flags &= ~DSF_LOCK; + ++ns->ns_if.if_opackets; + ns->ns_if.if_collisions += inb(nec+ds0_tbcr0); + } + + /* Receiver ovverun? */ + if (isr & DSIS_ROVRN) { + log(LOG_ERR, "ne%d: error: isr %x\n", ns-ne_softc, isr + /*, DSIS_BITS*/); + outb(nec+ds0_rbcr0, 0); + outb(nec+ds0_rbcr1, 0); + outb(nec+ds0_tcr, DSTC_LB0); + outb(nec+ds0_rcr, DSRC_MON); + outb(nec+ds_cmd, DSCM_START|DSCM_NODMA); + outb(nec+ds0_rcr, DSRC_AB); + outb(nec+ds0_tcr, 0); + } + + /* Any more to send? */ + outb (nec+ds_cmd, DSCM_NODMA|DSCM_PG0|DSCM_START); + nestart(&ns->ns_if); + outb (nec+ds_cmd, cmd); + outb (nec+ds0_imr, 0xff); + + /* Still more to do? */ + isr = inb (nec+ds0_isr); + if(isr) goto loop; +} + +/* + * Ethernet interface receiver interface. + * If input error just drop packet. + * Otherwise 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. + */ +nerecv(ns) + register struct ne_softc *ns; +{ + int len,i; + + ns->ns_if.if_ipackets++; + len = ns->ns_ph.pr_sz0 + (ns->ns_ph.pr_sz1<<8); + if(len < ETHER_MIN_LEN || len > ETHER_MAX_LEN) + return; + + /* this need not be so torturous - one/two bcopys at most into mbufs */ + nefetch(ns, ns->ns_pb, ns->ns_ba, min(len,DS_PGSIZE-sizeof(ns->ns_ph))); + if (len > DS_PGSIZE-sizeof(ns->ns_ph)) { + int l = len - (DS_PGSIZE-sizeof(ns->ns_ph)), b ; + u_char *p = ns->ns_pb + (DS_PGSIZE-sizeof(ns->ns_ph)); + + if(++ns->ns_cur > 0x7f) ns->ns_cur = 0x46; + b = ns->ns_cur*DS_PGSIZE; + + while (l >= DS_PGSIZE) { + nefetch(ns, p, b, DS_PGSIZE); + p += DS_PGSIZE; l -= DS_PGSIZE; + if(++ns->ns_cur > 0x7f) ns->ns_cur = 0x46; + b = ns->ns_cur*DS_PGSIZE; + } + if (l > 0) + nefetch(ns, p, b, l); + } + /* don't forget checksum! */ + len -= sizeof(struct ether_header) + sizeof(long); + + neread(ns,(caddr_t)(ns->ns_pb), len); +} + +/* + * Pass a packet to the higher levels. + * We deal with the trailer protocol here. + */ +neread(ns, buf, len) + register struct ne_softc *ns; + char *buf; + int len; +{ + register struct ether_header *eh; + struct mbuf *m; + int off, resid; + register struct ifqueue *inq; + + /* + * Deal with trailer protocol: if type is trailer type + * get true type from first 16-bit word past data. + * Remember that type was trailer by setting off. + */ + eh = (struct ether_header *)buf; + eh->ether_type = ntohs((u_short)eh->ether_type); +#define nedataaddr(eh, off, type) ((type)(((caddr_t)((eh)+1)+(off)))) + if (eh->ether_type >= ETHERTYPE_TRAIL && + eh->ether_type < ETHERTYPE_TRAIL+ETHERTYPE_NTRAILER) { + off = (eh->ether_type - ETHERTYPE_TRAIL) * 512; + if (off >= ETHERMTU) return; /* sanity */ + eh->ether_type = ntohs(*nedataaddr(eh, off, u_short *)); + resid = ntohs(*(nedataaddr(eh, off+2, u_short *))); + if (off + resid > len) return; /* sanity */ + len = off + resid; + } else off = 0; + + if (len == 0) return; + + /* + * Pull packet off interface. Off is nonzero if packet + * has trailing header; neget 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 = neget(buf, len, off, &ns->ns_if); + if (m == 0) return; + + ether_input(&ns->ns_if, eh, m); +} + +/* + * Supporting routines + */ + +/* + * Pull read data off a interface. + * Len is length of data, with local net header stripped. + * Off is non-zero if a trailer protocol was used, and + * gives the offset of the trailer information. + * We copy the trailer information and then all the normal + * data into mbufs. When full cluster sized units are present + * we copy into clusters. + */ +struct mbuf * +neget(buf, totlen, off0, ifp) + caddr_t buf; + int totlen, off0; + struct ifnet *ifp; +{ + struct mbuf *top, **mp, *m, *p; + int off = off0, len; + register caddr_t cp = buf; + char *epkt; + + buf += sizeof(struct ether_header); + cp = buf; + epkt = cp + totlen; + + + if (off) { + cp += off + 2 * sizeof(u_short); + totlen -= 2 * sizeof(u_short); + } + + MGETHDR(m, M_DONTWAIT, MT_DATA); + if (m == 0) + return (0); + m->m_pkthdr.rcvif = ifp; + m->m_pkthdr.len = totlen; + m->m_len = MHLEN; + + top = 0; + mp = ⊤ + while (totlen > 0) { + if (top) { + MGET(m, M_DONTWAIT, MT_DATA); + if (m == 0) { + m_freem(top); + return (0); + } + m->m_len = MLEN; + } + len = min(totlen, epkt - cp); + if (len >= MINCLSIZE) { + MCLGET(m, M_DONTWAIT); + if (m->m_flags & M_EXT) + m->m_len = len = min(len, MCLBYTES); + else + len = m->m_len; + } else { + /* + * Place initial small packet/header at end of mbuf. + */ + if (len < m->m_len) { + if (top == 0 && len + max_linkhdr <= m->m_len) + m->m_data += max_linkhdr; + m->m_len = len; + } else + len = m->m_len; + } + bcopy(cp, mtod(m, caddr_t), (unsigned)len); + cp += len; + *mp = m; + mp = &m->m_next; + totlen -= len; + if (cp == epkt) + cp = buf; + } + return (top); +} + +/* + * Process an ioctl request. + */ +neioctl(ifp, cmd, data) + register struct ifnet *ifp; + int cmd; + caddr_t data; +{ + register struct ifaddr *ifa = (struct ifaddr *)data; + struct ne_softc *ns = &ne_softc[ifp->if_unit]; + struct ifreq *ifr = (struct ifreq *)data; + int s = splimp(), error = 0; + + + switch (cmd) { + + case SIOCSIFADDR: + ifp->if_flags |= IFF_UP; + + switch (ifa->ifa_addr->sa_family) { +#ifdef INET + case AF_INET: + neinit(ifp->if_unit); /* before arpwhohas */ + ((struct arpcom *)ifp)->ac_ipaddr = + IA_SIN(ifa)->sin_addr; + arpwhohas((struct arpcom *)ifp, &IA_SIN(ifa)->sin_addr); + break; +#endif +#ifdef NS + case AF_NS: + { + register struct ns_addr *ina = &(IA_SNS(ifa)->sns_addr); + + if (ns_nullhost(*ina)) + ina->x_host = *(union ns_host *)(ns->ns_addr); + else { + /* + * The manual says we can't change the address + * while the receiver is armed, + * so reset everything + */ + ifp->if_flags &= ~IFF_RUNNING; + bcopy((caddr_t)ina->x_host.c_host, + (caddr_t)ns->ns_addr, sizeof(ns->ns_addr)); + } + neinit(ifp->if_unit); /* does ne_setaddr() */ + break; + } +#endif + default: + neinit(ifp->if_unit); + break; + } + break; + + case SIOCSIFFLAGS: + if ((ifp->if_flags & IFF_UP) == 0 && + ifp->if_flags & IFF_RUNNING) { + ifp->if_flags &= ~IFF_RUNNING; + outb(ns->ns_port + ds_cmd, DSCM_STOP|DSCM_NODMA); + } else if (ifp->if_flags & IFF_UP && + (ifp->if_flags & IFF_RUNNING) == 0) + neinit(ifp->if_unit); + break; + +#ifdef notdef + case SIOCGHWADDR: + bcopy((caddr_t)ns->ns_addr, (caddr_t) &ifr->ifr_data, + sizeof(ns->ns_addr)); + break; +#endif + + default: + error = EINVAL; + } + splx(s); + return (error); +} +#endif -- 2.20.1