/* * RTEMS driver for M68360 SCC1 Ethernet * * W. Eric Norum * Saskatchewan Accelerator Laboratory * University of Saskatchewan * Saskatoon, Saskatchewan, CANADA * eric@skatter.usask.ca * * $Id$ */ #include #include #include #include #include #include #include #include #include #include #include #include /* * Number of SCCs supported by this driver */ #define NSCCDRIVER 1 /* * Default number of buffer descriptors set aside for this driver. * The number of transmit buffer descriptors has to be quite large * since a single frame often uses four or more buffer descriptors. */ #define RX_BUF_COUNT 15 #define TX_BUF_COUNT 4 #define TX_BD_PER_BUF 4 /* * RTEMS event used by interrupt handler to signal driver tasks. * This must not be any of the events used by the network task synchronization. */ #define INTERRUPT_EVENT RTEMS_EVENT_1 /* * RTEMS event used to start transmit daemon. * This must not be the same as INTERRUPT_EVENT. */ #define START_TRANSMIT_EVENT RTEMS_EVENT_2 /* * Receive buffer size -- Allow for a full ethernet packet including CRC */ #define RBUF_SIZE 1520 #if (MCLBYTES < RBUF_SIZE) # error "Driver must have MCLBYTES > RBUF_SIZE" #endif /* * Per-device data */ struct scc_softc { struct arpcom arpcom; struct mbuf **rxMbuf; struct mbuf **txMbuf; int acceptBroadcast; int rxBdCount; int txBdCount; int txBdHead; int txBdTail; int txBdActiveCount; m360BufferDescriptor_t *rxBdBase; m360BufferDescriptor_t *txBdBase; rtems_id rxDaemonTid; rtems_id txDaemonTid; /* * Statistics */ unsigned long rxInterrupts; unsigned long rxNotFirst; unsigned long rxNotLast; unsigned long rxGiant; unsigned long rxNonOctet; unsigned long rxRunt; unsigned long rxBadCRC; unsigned long rxOverrun; unsigned long rxCollision; unsigned long txInterrupts; unsigned long txDeferred; unsigned long txHeartbeat; unsigned long txLateCollision; unsigned long txRetryLimit; unsigned long txUnderrun; unsigned long txLostCarrier; unsigned long txRawWait; }; static struct scc_softc scc_softc[NSCCDRIVER]; /* * SCC1 interrupt handler */ static rtems_isr m360Enet_interrupt_handler (rtems_vector_number v) { /* * Frame received? */ if ((m360.scc1.sccm & 0x8) && (m360.scc1.scce & 0x8)) { m360.scc1.scce = 0x8; m360.scc1.sccm &= ~0x8; scc_softc[0].rxInterrupts++; rtems_event_send (scc_softc[0].rxDaemonTid, INTERRUPT_EVENT); } /* * Buffer transmitted or transmitter error? */ if ((m360.scc1.sccm & 0x12) && (m360.scc1.scce & 0x12)) { m360.scc1.scce = 0x12; m360.scc1.sccm &= ~0x12; scc_softc[0].txInterrupts++; rtems_event_send (scc_softc[0].txDaemonTid, INTERRUPT_EVENT); } m360.cisr = 1UL << 30; /* Clear SCC1 interrupt-in-service bit */ } /* * Initialize the ethernet hardware */ static void m360Enet_initialize_hardware (struct scc_softc *sc) { int i; unsigned char *hwaddr; rtems_status_code status; rtems_isr_entry old_handler; /* * Configure port A CLK1, CLK2, TXD1 and RXD1 pins */ m360.papar |= 0x303; m360.padir &= ~0x303; m360.paodr &= ~0x303; /* * Configure port C CTS1* and CD1* pins */ m360.pcpar &= ~0x30; m360.pcdir &= ~0x30; m360.pcso |= 0x30; /* * Connect CLK1 and CLK2 to SCC1 */ m360.sicr &= ~0xFF; m360.sicr |= (5 << 3) | 4; /* * Allocate mbuf pointers */ sc->rxMbuf = malloc (sc->rxBdCount * sizeof *sc->rxMbuf, M_MBUF, M_NOWAIT); sc->txMbuf = malloc (sc->txBdCount * sizeof *sc->txMbuf, M_MBUF, M_NOWAIT); if (!sc->rxMbuf || !sc->txMbuf) rtems_panic ("No memory for mbuf pointers"); /* * Set receiver and transmitter buffer descriptor bases */ sc->rxBdBase = M360AllocateBufferDescriptors(sc->rxBdCount); sc->txBdBase = M360AllocateBufferDescriptors(sc->txBdCount); m360.scc1p.rbase = (char *)sc->rxBdBase - (char *)&m360; m360.scc1p.tbase = (char *)sc->txBdBase - (char *)&m360; /* * Send "Init parameters" command */ M360ExecuteRISC (M360_CR_OP_INIT_RX_TX | M360_CR_CHAN_SCC1); /* * Set receive and transmit function codes */ m360.scc1p.rfcr = M360_RFCR_MOT | M360_RFCR_DMA_SPACE; m360.scc1p.tfcr = M360_TFCR_MOT | M360_TFCR_DMA_SPACE; /* * Set maximum receive buffer length */ m360.scc1p.mrblr = RBUF_SIZE; /* * Set CRC parameters */ m360.scc1p.un.ethernet.c_pres = 0xFFFFFFFF; m360.scc1p.un.ethernet.c_mask = 0xDEBB20E3; /* * Clear diagnostic counters */ m360.scc1p.un.ethernet.crcec = 0; m360.scc1p.un.ethernet.alec = 0; m360.scc1p.un.ethernet.disfc = 0; /* * Set pad value */ m360.scc1p.un.ethernet.pads = 0x8888; /* * Set retry limit */ m360.scc1p.un.ethernet.ret_lim = 15; /* * Set maximum and minimum frame length */ m360.scc1p.un.ethernet.mflr = 1518; m360.scc1p.un.ethernet.minflr = 64; m360.scc1p.un.ethernet.maxd1 = RBUF_SIZE; m360.scc1p.un.ethernet.maxd2 = RBUF_SIZE; /* * Clear group address hash table */ m360.scc1p.un.ethernet.gaddr1 = 0; m360.scc1p.un.ethernet.gaddr2 = 0; m360.scc1p.un.ethernet.gaddr3 = 0; m360.scc1p.un.ethernet.gaddr4 = 0; /* * Set our physical address */ hwaddr = sc->arpcom.ac_enaddr; m360.scc1p.un.ethernet.paddr_h = (hwaddr[5] << 8) | hwaddr[4]; m360.scc1p.un.ethernet.paddr_m = (hwaddr[3] << 8) | hwaddr[2]; m360.scc1p.un.ethernet.paddr_l = (hwaddr[1] << 8) | hwaddr[0]; /* * Aggressive retry */ m360.scc1p.un.ethernet.p_per = 0; /* * Clear individual address hash table */ m360.scc1p.un.ethernet.iaddr1 = 0; m360.scc1p.un.ethernet.iaddr2 = 0; m360.scc1p.un.ethernet.iaddr3 = 0; m360.scc1p.un.ethernet.iaddr4 = 0; /* * Set up receive buffer descriptors */ for (i = 0 ; i < sc->rxBdCount ; i++) (sc->rxBdBase + i)->status = 0; /* * Set up transmit buffer descriptors */ for (i = 0 ; i < sc->txBdCount ; i++) { (sc->txBdBase + i)->status = 0; sc->txMbuf[i] = NULL; } sc->txBdHead = sc->txBdTail = 0; sc->txBdActiveCount = 0; /* * Clear any outstanding events */ m360.scc1.scce = 0xFFFF; /* * Set up interrupts */ status = rtems_interrupt_catch (m360Enet_interrupt_handler, (m360.cicr & 0xE0) | 0x1E, &old_handler); if (status != RTEMS_SUCCESSFUL) rtems_panic ("Can't attach M360 SCC1 interrupt handler: %s\n", rtems_status_text (status)); m360.scc1.sccm = 0; /* No interrupts unmasked till necessary */ m360.cimr |= (1UL << 30); /* Enable SCC1 interrupt */ /* * Set up General SCC Mode Register * Ethernet configuration */ m360.scc1.gsmr_h = 0x0; m360.scc1.gsmr_l = 0x1088000c; /* * Set up data synchronization register * Ethernet synchronization pattern */ m360.scc1.dsr = 0xd555; /* * Set up protocol-specific mode register * Heartbeat check * No force collision * Discard short frames * Individual address mode * Ethernet CRC * Not promisuous * Ignore/accept broadcast packets as specified * Normal backoff timer * No loopback * No input sample at end of frame * 64-byte limit for late collision * Wait 22 bits before looking for start of frame delimiter * Disable full-duplex operation */ m360.scc1.psmr = 0x880A | (sc->acceptBroadcast ? 0 : 0x100); /* * Enable the TENA (RTS1*) pin */ #if (defined (M68360_ATLAS_HSB)) m360.pbpar |= 0x1000; m360.pbdir |= 0x1000; #else m360.pcpar |= 0x1; m360.pcdir &= ~0x1; #endif } /* * Soak up buffer descriptors that have been sent * Note that a buffer descriptor can't be retired as soon as it becomes * ready. The MC68360 Errata (May 96) says that, "If an Ethernet frame is * made up of multiple buffers, the user should not reuse the first buffer * descriptor until the last buffer descriptor of the frame has had its * ready bit cleared by the CPM". */ static void m360Enet_retire_tx_bd (struct scc_softc *sc) { rtems_unsigned16 status; int i; int nRetired; struct mbuf *m, *n; i = sc->txBdTail; nRetired = 0; while ((sc->txBdActiveCount != 0) && (((status = (sc->txBdBase + i)->status) & M360_BD_READY) == 0)) { /* * See if anything went wrong */ if (status & (M360_BD_DEFER | M360_BD_HEARTBEAT | M360_BD_LATE_COLLISION | M360_BD_RETRY_LIMIT | M360_BD_UNDERRUN | M360_BD_CARRIER_LOST)) { /* * Check for errors which stop the transmitter. */ if (status & (M360_BD_LATE_COLLISION | M360_BD_RETRY_LIMIT | M360_BD_UNDERRUN)) { if (status & M360_BD_LATE_COLLISION) scc_softc[0].txLateCollision++; if (status & M360_BD_RETRY_LIMIT) scc_softc[0].txRetryLimit++; if (status & M360_BD_UNDERRUN) scc_softc[0].txUnderrun++; /* * Restart the transmitter */ M360ExecuteRISC (M360_CR_OP_RESTART_TX | M360_CR_CHAN_SCC1); } if (status & M360_BD_DEFER) scc_softc[0].txDeferred++; if (status & M360_BD_HEARTBEAT) scc_softc[0].txHeartbeat++; if (status & M360_BD_CARRIER_LOST) scc_softc[0].txLostCarrier++; } nRetired++; if (status & M360_BD_LAST) { /* * A full frame has been transmitted. * Free all the associated buffer descriptors. */ sc->txBdActiveCount -= nRetired; while (nRetired) { nRetired--; m = sc->txMbuf[sc->txBdTail]; MFREE (m, n); if (++sc->txBdTail == sc->txBdCount) sc->txBdTail = 0; } } if (++i == sc->txBdCount) i = 0; } } /* * SCC reader task */ static void scc_rxDaemon (void *arg) { struct scc_softc *sc = (struct scc_softc *)arg; struct ifnet *ifp = &sc->arpcom.ac_if; struct mbuf *m; rtems_unsigned16 status; m360BufferDescriptor_t *rxBd; int rxBdIndex; /* * Allocate space for incoming packets and start reception */ for (rxBdIndex = 0 ; ;) { rxBd = sc->rxBdBase + rxBdIndex; MGETHDR (m, M_WAIT, MT_DATA); MCLGET (m, M_WAIT); m->m_pkthdr.rcvif = ifp; sc->rxMbuf[rxBdIndex] = m; rxBd->buffer = mtod (m, void *); rxBd->status = M360_BD_EMPTY | M360_BD_INTERRUPT; if (++rxBdIndex == sc->rxBdCount) { rxBd->status |= M360_BD_WRAP; break; } } /* * Input packet handling loop */ rxBdIndex = 0; for (;;) { rxBd = sc->rxBdBase + rxBdIndex; /* * Wait for packet if there's not one ready */ if ((status = rxBd->status) & M360_BD_EMPTY) { /* * Clear old events */ m360.scc1.scce = 0x8; /* * Wait for packet * Note that the buffer descriptor is checked * *before* the event wait -- this catches the * possibility that a packet arrived between the * `if' above, and the clearing of the event register. */ while ((status = rxBd->status) & M360_BD_EMPTY) { rtems_event_set events; /* * Unmask RXF (Full frame received) event */ m360.scc1.sccm |= 0x8; rtems_bsdnet_event_receive (INTERRUPT_EVENT, RTEMS_WAIT|RTEMS_EVENT_ANY, RTEMS_NO_TIMEOUT, &events); } } /* * Check that packet is valid */ if ((status & (M360_BD_LAST | M360_BD_FIRST_IN_FRAME | M360_BD_LONG | M360_BD_NONALIGNED | M360_BD_SHORT | M360_BD_CRC_ERROR | M360_BD_OVERRUN | M360_BD_COLLISION)) == (M360_BD_LAST | M360_BD_FIRST_IN_FRAME)) { /* * Pass the packet up the chain. * FIXME: Packet filtering hook could be done here. */ struct ether_header *eh; m = sc->rxMbuf[rxBdIndex]; m->m_len = m->m_pkthdr.len = rxBd->length - sizeof(rtems_unsigned32) - sizeof(struct ether_header); eh = mtod (m, struct ether_header *); m->m_data += sizeof(struct ether_header); ether_input (ifp, eh, m); /* * Allocate a new mbuf */ MGETHDR (m, M_WAIT, MT_DATA); MCLGET (m, M_WAIT); m->m_pkthdr.rcvif = ifp; sc->rxMbuf[rxBdIndex] = m; rxBd->buffer = mtod (m, void *); } else { /* * Something went wrong with the reception */ if (!(status & M360_BD_LAST)) sc->rxNotLast++; if (!(status & M360_BD_FIRST_IN_FRAME)) sc->rxNotFirst++; if (status & M360_BD_LONG) sc->rxGiant++; if (status & M360_BD_NONALIGNED) sc->rxNonOctet++; if (status & M360_BD_SHORT) sc->rxRunt++; if (status & M360_BD_CRC_ERROR) sc->rxBadCRC++; if (status & M360_BD_OVERRUN) sc->rxOverrun++; if (status & M360_BD_COLLISION) sc->rxCollision++; } /* * Reenable the buffer descriptor */ rxBd->status = (status & (M360_BD_WRAP | M360_BD_INTERRUPT)) | M360_BD_EMPTY; /* * Move to next buffer descriptor */ if (++rxBdIndex == sc->rxBdCount) rxBdIndex = 0; } } static void sendpacket (struct ifnet *ifp, struct mbuf *m) { struct scc_softc *sc = ifp->if_softc; volatile m360BufferDescriptor_t *firstTxBd, *txBd; struct mbuf *l = NULL; rtems_unsigned16 status; int nAdded; /* * Free up buffer descriptors */ m360Enet_retire_tx_bd (sc); /* * Set up the transmit buffer descriptors. * No need to pad out short packets since the * hardware takes care of that automatically. * No need to copy the packet to a contiguous buffer * since the hardware is capable of scatter/gather DMA. */ nAdded = 0; txBd = firstTxBd = sc->txBdBase + sc->txBdHead; for (;;) { /* * Wait for buffer descriptor to become available. */ if ((sc->txBdActiveCount + nAdded) == sc->txBdCount) { /* * Clear old events */ m360.scc1.scce = 0x12; /* * Wait for buffer descriptor to become available. * Note that the buffer descriptors are checked * *before* * entering the wait loop -- this catches * the possibility that a buffer descriptor became * available between the `if' above, and the clearing * of the event register. * This is to catch the case where the transmitter * stops in the middle of a frame -- and only the * last buffer descriptor in a frame can generate * an interrupt. */ m360Enet_retire_tx_bd (sc); while ((sc->txBdActiveCount + nAdded) == sc->txBdCount) { rtems_event_set events; /* * Unmask TXB (buffer transmitted) and * TXE (transmitter error) events. */ m360.scc1.sccm |= 0x12; rtems_bsdnet_event_receive (INTERRUPT_EVENT, RTEMS_WAIT|RTEMS_EVENT_ANY, RTEMS_NO_TIMEOUT, &events); m360Enet_retire_tx_bd (sc); } } /* * Don't set the READY flag till the * whole packet has been readied. */ status = nAdded ? M360_BD_READY : 0; /* * FIXME: Why not deal with empty mbufs at at higher level? * The IP fragmentation routine in ip_output * can produce packet fragments with zero length. * I think that ip_output should be changed to get * rid of these zero-length mbufs, but for now, * I'll deal with them here. */ if (m->m_len) { /* * Fill in the buffer descriptor */ txBd->buffer = mtod (m, void *); txBd->length = m->m_len; sc->txMbuf[sc->txBdHead] = m; nAdded++; if (++sc->txBdHead == sc->txBdCount) { status |= M360_BD_WRAP; sc->txBdHead = 0; } l = m; m = m->m_next; } else { /* * Just toss empty mbufs */ struct mbuf *n; MFREE (m, n); m = n; if (l != NULL) l->m_next = m; } /* * Set the transmit buffer status. * Break out of the loop if this mbuf is the last in the frame. */ if (m == NULL) { if (nAdded) { status |= M360_BD_PAD | M360_BD_LAST | M360_BD_TX_CRC | M360_BD_INTERRUPT; txBd->status = status; firstTxBd->status |= M360_BD_READY; sc->txBdActiveCount += nAdded; } break; } txBd->status = status; txBd = sc->txBdBase + sc->txBdHead; } } /* * Driver transmit daemon */ void scc_txDaemon (void *arg) { struct scc_softc *sc = (struct scc_softc *)arg; struct ifnet *ifp = &sc->arpcom.ac_if; struct mbuf *m; rtems_event_set events; for (;;) { /* * Wait for packet */ rtems_bsdnet_event_receive (START_TRANSMIT_EVENT, RTEMS_EVENT_ANY | RTEMS_WAIT, RTEMS_NO_TIMEOUT, &events); /* * Send packets till queue is empty */ for (;;) { /* * Get the next mbuf chain to transmit. */ IF_DEQUEUE(&ifp->if_snd, m); if (!m) break; sendpacket (ifp, m); } ifp->if_flags &= ~IFF_OACTIVE; } } /* * Send packet (caller provides header). */ static void scc_start (struct ifnet *ifp) { struct scc_softc *sc = ifp->if_softc; rtems_event_send (sc->txDaemonTid, START_TRANSMIT_EVENT); ifp->if_flags |= IFF_OACTIVE; } /* * Initialize and start the device */ static void scc_init (void *arg) { struct scc_softc *sc = arg; struct ifnet *ifp = &sc->arpcom.ac_if; if (sc->txDaemonTid == 0) { /* * Set up SCC hardware */ m360Enet_initialize_hardware (sc); /* * Start driver tasks */ sc->txDaemonTid = rtems_bsdnet_newproc ("SCtx", 4096, scc_txDaemon, sc); sc->rxDaemonTid = rtems_bsdnet_newproc ("SCrx", 4096, scc_rxDaemon, sc); } /* * Set flags appropriately */ if (ifp->if_flags & IFF_PROMISC) m360.scc1.psmr |= 0x200; else m360.scc1.psmr &= ~0x200; /* * Tell the world that we're running. */ ifp->if_flags |= IFF_RUNNING; /* * Enable receiver and transmitter */ m360.scc1.gsmr_l |= 0x30; } /* * Stop the device */ static void scc_stop (struct scc_softc *sc) { struct ifnet *ifp = &sc->arpcom.ac_if; ifp->if_flags &= ~IFF_RUNNING; /* * Shut down receiver and transmitter */ m360.scc1.gsmr_l &= ~0x30; } /* * Show interface statistics */ static void scc_stats (struct scc_softc *sc) { printf (" Rx Interrupts:%-8lu", sc->rxInterrupts); printf (" Not First:%-8lu", sc->rxNotFirst); printf (" Not Last:%-8lu\n", sc->rxNotLast); printf (" Giant:%-8lu", sc->rxGiant); printf (" Runt:%-8lu", sc->rxRunt); printf (" Non-octet:%-8lu\n", sc->rxNonOctet); printf (" Bad CRC:%-8lu", sc->rxBadCRC); printf (" Overrun:%-8lu", sc->rxOverrun); printf (" Collision:%-8lu\n", sc->rxCollision); printf (" Discarded:%-8lu\n", (unsigned long)m360.scc1p.un.ethernet.disfc); printf (" Tx Interrupts:%-8lu", sc->txInterrupts); printf (" Deferred:%-8lu", sc->txDeferred); printf (" Missed Hearbeat:%-8lu\n", sc->txHeartbeat); printf (" No Carrier:%-8lu", sc->txLostCarrier); printf ("Retransmit Limit:%-8lu", sc->txRetryLimit); printf (" Late Collision:%-8lu\n", sc->txLateCollision); printf (" Underrun:%-8lu", sc->txUnderrun); printf (" Raw output wait:%-8lu\n", sc->txRawWait); } /* * Driver ioctl handler */ static int scc_ioctl (struct ifnet *ifp, int command, caddr_t data) { struct scc_softc *sc = ifp->if_softc; int error = 0; switch (command) { case SIOCGIFADDR: case SIOCSIFADDR: ether_ioctl (ifp, command, data); break; case SIOCSIFFLAGS: switch (ifp->if_flags & (IFF_UP | IFF_RUNNING)) { case IFF_RUNNING: scc_stop (sc); break; case IFF_UP: scc_init (sc); break; case IFF_UP | IFF_RUNNING: scc_stop (sc); scc_init (sc); break; default: break; } break; case SIO_RTEMS_SHOW_STATS: scc_stats (sc); break; /* * FIXME: All sorts of multicast commands need to be added here! */ default: error = EINVAL; break; } return error; } /* * Attach an SCC driver to the system */ int rtems_scc1_driver_attach (struct rtems_bsdnet_ifconfig *config) { struct scc_softc *sc; struct ifnet *ifp; int mtu; int unitNumber; char *unitName; /* * Parse driver name */ if ((unitNumber = rtems_bsdnet_parse_driver_name (config, &unitName)) < 0) return 0; /* * Is driver free? */ if ((unitNumber <= 0) || (unitNumber > NSCCDRIVER)) { printf ("Bad SCC unit number.\n"); return 0; } sc = &scc_softc[unitNumber - 1]; ifp = &sc->arpcom.ac_if; if (ifp->if_softc != NULL) { printf ("Driver already in use.\n"); return 0; } /* * Process options */ if (config->hardware_address) { memcpy (sc->arpcom.ac_enaddr, config->hardware_address, ETHER_ADDR_LEN); } else { /* * The first 4 bytes of the bootstrap prom * contain the value loaded into the stack * pointer as part of the CPU32's hardware * reset exception handler. The following * 4 bytes contain the value loaded into the * program counter. The boards' Ethernet * address is stored in the six bytes * immediately preceding this initial * program counter value. * * See start360/start360.s. */ extern void *_RomBase; /* From linkcmds */ const unsigned long *ExceptionVectors; const unsigned char *entryPoint; /* * Sanity check -- assume entry point must be * within 1 MByte of beginning of boot ROM. */ ExceptionVectors = (const unsigned long *)&_RomBase; entryPoint = (const unsigned char *)ExceptionVectors[1]; if (((unsigned long)entryPoint - (unsigned long)ExceptionVectors) >= (1 * 1024 * 1024)) { printf ("Warning -- Ethernet address can not be found in bootstrap PROM.\n"); sc->arpcom.ac_enaddr[0] = 0x08; sc->arpcom.ac_enaddr[1] = 0xF3; sc->arpcom.ac_enaddr[2] = 0x3E; sc->arpcom.ac_enaddr[3] = 0xC2; sc->arpcom.ac_enaddr[4] = 0x7E; sc->arpcom.ac_enaddr[5] = 0x38; } else { memcpy (sc->arpcom.ac_enaddr, entryPoint - ETHER_ADDR_LEN, ETHER_ADDR_LEN); } } if (config->mtu) mtu = config->mtu; else mtu = ETHERMTU; if (config->rbuf_count) sc->rxBdCount = config->rbuf_count; else sc->rxBdCount = RX_BUF_COUNT; if (config->xbuf_count) sc->txBdCount = config->xbuf_count; else sc->txBdCount = TX_BUF_COUNT * TX_BD_PER_BUF; sc->acceptBroadcast = !config->ignore_broadcast; /* * Set up network interface values */ ifp->if_softc = sc; ifp->if_unit = unitNumber; ifp->if_name = unitName; ifp->if_mtu = mtu; ifp->if_init = scc_init; ifp->if_ioctl = scc_ioctl; ifp->if_start = scc_start; ifp->if_output = ether_output; ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX; if (ifp->if_snd.ifq_maxlen == 0) ifp->if_snd.ifq_maxlen = ifqmaxlen; /* * Attach the interface */ if_attach (ifp); ether_ifattach (ifp); return 1; };