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NetBSD/sys/arch/mac68k/dev/if_ae.c
briggs a71a746946 MIN -> min. This needs a lot of work.
1994-06-26 13:01:24 +00:00

1404 lines
34 KiB
C
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/*
* Device driver for National Semiconductor DS8390 based ethernet adapters.
*
* Based on original ISA bus driver by David Greenman, 29-April-1993
*
* Copyright (C) 1993, David Greenman. This software may be used, modified,
* copied, distributed, and sold, in both source and binary form provided
* that the above copyright and these terms are retained. Under no
* circumstances is the author responsible for the proper functioning
* of this software, nor does the author assume any responsibility
* for damages incurred with its use.
*
* Adapted for MacBSD by Brad Parker <brad@fcr.com>
*
* Currently supports:
* Apples NB Ethernet card
* Interlan A310 Nubus Ethernet card
* Cayman Systems GatorCard
*/
/*
* $Id: if_ae.c,v 1.13 1994/06/26 13:01:24 briggs Exp $
*/
#include "ae.h"
/* bpfilter included here in case it is needed in future net includes */
#include "bpfilter.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/errno.h>
#include <sys/ioctl.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/syslog.h>
#include <net/if.h>
#include <net/if_dl.h>
#include <net/if_types.h>
#include <net/netisr.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
#if NBPFILTER > 0
#include <net/bpf.h>
#include <net/bpfdesc.h>
#endif
#include <sys/device.h>
#include "nubus.h"
#include "if_aereg.h"
struct ae_device {
struct device ae_dev;
/* struct nubusdev ae_nu;
struct intrhand ae_ih; */
};
/*
* ae_softc: per line info and status
*/
struct ae_softc {
struct ae_device *sc_ae;
struct arpcom arpcom; /* ethernet common */
char *type_str; /* pointer to type string */
u_char vendor; /* interface vendor */
u_char type; /* interface type code */
#define APPLE_CARD(sc) ((sc)->vendor == AE_VENDOR_APPLE)
#define REG_MAP(sc, reg) (APPLE_CARD(sc) ? (0x0f-(reg))<<2 : (reg)<<2)
#define NIC_GET(sc, reg) ((sc)->nic_addr[REG_MAP(sc, reg)])
#define NIC_PUT(sc, reg, val) ((sc)->nic_addr[REG_MAP(sc, reg)] = (val))
volatile caddr_t nic_addr; /* NIC (DS8390) I/O bus address */
caddr_t rom_addr; /* on board prom address */
caddr_t smem_start; /* shared memory start address */
caddr_t smem_end; /* shared memory end address */
u_long smem_size; /* total shared memory size */
caddr_t smem_ring; /* start of RX ring-buffer (in smem) */
caddr_t bpf; /* BPF "magic cookie" */
u_char xmit_busy; /* transmitter is busy */
u_char txb_cnt; /* Number of transmit buffers */
u_char txb_next; /* Pointer to next buffer ready to xmit */
u_short txb_next_len; /* next xmit buffer length */
u_char data_buffered; /* data has been buffered in interface memory */
u_char tx_page_start; /* first page of TX buffer area */
u_char rec_page_start; /* first page of RX ring-buffer */
u_char rec_page_stop; /* last page of RX ring-buffer */
u_char next_packet; /* pointer to next unread RX packet */
} ae_softc[NAE];
void ae_find(), ae_attach();
int ae_init(), aeintr(), ae_ioctl(), ae_probe(),
ae_start(), ae_reset(), ae_watchdog();
struct cfdriver aecd =
{ NULL, "ae", ae_probe, ae_attach, DV_IFNET, sizeof(struct ae_device), NULL, 0 };
static void ae_stop();
static inline void ae_rint();
static inline void ae_xmit();
static inline char *ae_ring_copy();
extern int ether_output();
#define ETHER_MIN_LEN 64
#define ETHER_MAX_LEN 1518
#define ETHER_ADDR_LEN 6
#define ETHER_HDR_SIZE 14
char ae_name[] = "8390 Nubus Ethernet card";
static char zero = 0;
static u_char ones = 0xff;
struct vendor_S {
char *manu;
int len;
int vendor;
} vend[] = {
{ "Apple", 5, AE_VENDOR_APPLE },
{ "3Com", 4, AE_VENDOR_APPLE },
{ "Dayna", 5, AE_VENDOR_DAYNA },
{ "Inter", 5, AE_VENDOR_INTERLAN },
};
static int numvend = sizeof(vend)/sizeof(vend[0]);
/*
* XXX These two should be moved to locore, and maybe changed to use shorts
* instead of bytes. The reason for these is that bcopy and bzero use longs,
* which the ethernet cards can't handle.
*/
void
bbzero (char *addr, int len)
{
while (len--) {
*addr++ = 0;
}
}
void
bbcopy (char *src, char *dest, int len)
{
while (len--) {
*dest++ = *src++;
}
}
void
ae_id_card(nu, sc)
struct nubus_hw *nu;
struct ae_softc *sc;
{
int i;
/*
* Try to determine what type of card this is...
*/
sc->vendor = AE_VENDOR_UNKNOWN;
for (i=0 ; i<numvend ; i++) {
if (!strncmp(nu->Slot.manufacturer, vend[i].manu, vend[i].len)) {
sc->vendor = vend[i].vendor;
break;
}
}
sc->type_str = (char *) (nu->Slot.manufacturer);
/* see if it's an Interlan/GatorCard
sc->rom_addr = nu->addr + GC_ROM_OFFSET;
if (sc->rom_addr[0x18] == 0x0 &&
sc->rom_addr[0x1c] == 0x55) {
sc->vendor = AE_VENDOR_INTERLAN;
} */
}
int
ae_probe(parent, cf, aux)
struct cfdriver *parent;
struct cfdata *cf;
void *aux;
{
register struct nubus_hw *nu = (struct nubus_hw *) aux;
struct ae_softc *sc = &ae_softc[cf->cf_unit];
int i, memsize;
int flags = 0;
if (nu->Slot.type != NUBUS_NETWORK)
return 0;
ae_id_card(nu, sc);
switch (sc->vendor) {
case AE_VENDOR_INTERLAN:
sc->nic_addr = nu->addr + GC_NIC_OFFSET;
sc->rom_addr = nu->addr + GC_ROM_OFFSET;
sc->smem_start = nu->addr + GC_DATA_OFFSET;
memsize = 8192;
/* reset the NIC chip */
*((caddr_t)nu->addr + GC_RESET_OFFSET) = (char)zero;
/* Get station address from on-board ROM */
for (i = 0; i < ETHER_ADDR_LEN; ++i)
sc->arpcom.ac_enaddr[i] = *(sc->rom_addr + i*4);
break;
case AE_VENDOR_APPLE:
sc->nic_addr = nu->addr + AE_NIC_OFFSET;
sc->rom_addr = nu->addr + AE_ROM_OFFSET;
sc->smem_start = nu->addr + AE_DATA_OFFSET;
memsize = 8192;
/* Get station address from on-board ROM */
for (i = 0; i < ETHER_ADDR_LEN; ++i)
sc->arpcom.ac_enaddr[i] = *(sc->rom_addr + i*2);
break;
case AE_VENDOR_DAYNA:
printf("We think we are a Dayna card, but ");
sc->nic_addr = nu->addr + DP_NIC_OFFSET;
sc->rom_addr = nu->addr + DP_ROM_OFFSET;
sc->smem_start = nu->addr + DP_DATA_OFFSET;
memsize = 8192;
/* Get station address from on-board ROM */
for (i = 0; i < ETHER_ADDR_LEN; ++i)
sc->arpcom.ac_enaddr[i] = *(sc->rom_addr + i*2);
printf("it is dangerous to continue.\n");
return 0; /* Since we don't work yet... */
break;
default:
return 0;
break;
}
/*
* allocate one xmit buffer if < 16k, two buffers otherwise
*/
if ((memsize < 16384) || (flags & AE_FLAGS_NO_DOUBLE_BUFFERING)) {
sc->smem_ring = sc->smem_start + (AE_PAGE_SIZE * AE_TXBUF_SIZE);
sc->txb_cnt = 1;
sc->rec_page_start = AE_TXBUF_SIZE;
} else {
sc->smem_ring = sc->smem_start + (AE_PAGE_SIZE * AE_TXBUF_SIZE * 2);
sc->txb_cnt = 2;
sc->rec_page_start = AE_TXBUF_SIZE * 2;
}
sc->smem_size = memsize;
sc->smem_end = sc->smem_start + memsize;
sc->rec_page_stop = memsize / AE_PAGE_SIZE;
sc->tx_page_start = 0;
/*
* Now zero memory and verify that it is clear
*/
bbzero(sc->smem_start, memsize);
for (i = 0; i < memsize; ++i)
if (sc->smem_start[i]) {
printf(": failed to clear shared memory at %x\n",
sc->smem_start + i);
return(0);
}
#ifdef DEBUG_PRINT
printf("nic_addr %x, rom_addr %x\n",
sc->nic_addr, sc->rom_addr);
printf("smem_size %d\n", sc->smem_size);
printf("smem_start %x, smem_ring %x, smem_end %x\n",
sc->smem_start, sc->smem_ring, sc->smem_end);
printf("phys address %02x:%02x:%02x:%02x:%02x:%02x\n",
sc->arpcom.ac_enaddr[0],
sc->arpcom.ac_enaddr[1],
sc->arpcom.ac_enaddr[2],
sc->arpcom.ac_enaddr[3],
sc->arpcom.ac_enaddr[4],
sc->arpcom.ac_enaddr[5]);
#endif
return(1);
}
/*
* Install interface into kernel networking data structures
*/
void
ae_attach(parent, self, aux)
struct cfdriver *parent, *self;
void *aux;
{
struct nubus_hw *nu = aux;
struct ae_device *ae = (struct ae_device *) self;
struct ae_softc *sc = &ae_softc[ae->ae_dev.dv_unit];
struct cfdata *cf = ae->ae_dev.dv_cfdata;
struct ifnet *ifp = &sc->arpcom.ac_if;
struct ifaddr *ifa;
struct sockaddr_dl *sdl;
sc->sc_ae = ae;
/*
* Set interface to stopped condition (reset)
*/
ae_stop(sc);
/*
* Initialize ifnet structure
*/
ifp->if_unit = ae->ae_dev.dv_unit;
ifp->if_name = aecd.cd_name;
ifp->if_mtu = ETHERMTU;
ifp->if_output = ether_output;
ifp->if_start = ae_start;
ifp->if_ioctl = ae_ioctl;
ifp->if_reset = ae_reset;
ifp->if_watchdog = ae_watchdog;
ifp->if_flags = (IFF_BROADCAST | IFF_SIMPLEX | IFF_NOTRAILERS);
#if 0
/*
* Set default state for ALTPHYS flag (used to disable the transceiver
* for AUI operation), based on compile-time config option.
*/
if (cf->cf_flags & AE_FLAGS_DISABLE_TRANSCEIVER)
ifp->if_flags |= IFF_ALTPHYS;
#endif
/*
* Attach the interface
*/
if_attach(ifp);
/*
* Search down the ifa address list looking for the AF_LINK type entry
*/
ifa = ifp->if_addrlist;
while ((ifa != 0) && (ifa->ifa_addr != 0) &&
(ifa->ifa_addr->sa_family != AF_LINK))
ifa = ifa->ifa_next;
/*
* If we find an AF_LINK type entry we fill in the hardware address.
* This is useful for netstat(1) to keep track of which interface
* is which.
*/
if ((ifa != 0) && (ifa->ifa_addr != 0)) {
/*
* Fill in the link-level address for this interface
*/
sdl = (struct sockaddr_dl *)ifa->ifa_addr;
sdl->sdl_type = IFT_ETHER;
sdl->sdl_alen = ETHER_ADDR_LEN;
sdl->sdl_slen = 0;
bbcopy(sc->arpcom.ac_enaddr, LLADDR(sdl), ETHER_ADDR_LEN);
}
/*
* Print additional info when attached
*/
printf(": address %s, ", ether_sprintf(sc->arpcom.ac_enaddr));
if (sc->type_str && (*sc->type_str != 0))
printf("type %s ", sc->type_str);
else
printf("type unknown (0x%x) ", sc->type);
printf("\n");
/*
* If BPF is in the kernel, call the attach for it
*/
#if NBPFILTER > 0
bpfattach(&sc->bpf, ifp, DLT_EN10MB, sizeof(struct ether_header));
#endif
}
/*
* Reset interface.
*/
int
ae_reset(sc)
struct ae_softc *sc;
{
int s;
s = splnet();
/*
* Stop interface and re-initialize.
*/
ae_stop(sc);
ae_init(sc);
(void) splx(s);
}
/*
* Take interface offline.
*/
void
ae_stop(sc)
struct ae_softc *sc;
{
int n = 5000;
/*
* Stop everything on the interface, and select page 0 registers.
*/
NIC_PUT(sc, AE_P0_CR, AE_CR_RD2|AE_CR_STP);
/*
* Wait for interface to enter stopped state, but limit # of checks
* to 'n' (about 5ms). It shouldn't even take 5us on modern
* DS8390's, but just in case it's an old one.
*/
while (((NIC_GET(sc, AE_P0_ISR) & AE_ISR_RST) == 0) && --n);
}
/*
* Device timeout/watchdog routine. Entered if the device neglects to
* generate an interrupt after a transmit has been started on it.
*/
int
ae_watchdog(unit)
short unit;
{
log(LOG_ERR, "ae%d: device timeout\n", unit);
{
struct ae_softc *sc = &ae_softc[unit];
printf("cr %x, isr %x\n", NIC_GET(sc, AE_P0_CR), NIC_GET(sc, AE_P0_ISR));
/* via_dump(); */
if (NIC_GET(sc, AE_P0_ISR)) {
aeintr(0);
return;
}
}
ae_reset(unit);
}
/*
* Initialize device.
*/
ae_init(sc)
struct ae_softc *sc;
{
struct ifnet *ifp = &sc->arpcom.ac_if;
int i, s;
u_char command;
/* address not known */
if (ifp->if_addrlist == (struct ifaddr *)0) return;
/*
* Initialize the NIC in the exact order outlined in the NS manual.
* This init procedure is "mandatory"...don't change what or when
* things happen.
*/
s = splnet();
/* reset transmitter flags */
sc->data_buffered = 0;
sc->xmit_busy = 0;
sc->arpcom.ac_if.if_timer = 0;
sc->txb_next = 0;
/* This variable is used below - don't move this assignment */
sc->next_packet = sc->rec_page_start + 1;
#ifdef DEBUG_PRINT
printf("page_start %d, page_stop %d, next %d\n",
sc->rec_page_start, sc->rec_page_stop, sc->next_packet);
#endif
/*
* Set interface for page 0, Remote DMA complete, Stopped
*/
NIC_PUT(sc, AE_P0_CR, AE_CR_RD2|AE_CR_STP);
/*
* Set FIFO threshold to 4, No auto-init Remote DMA, Burst mode,
* byte order=80x86, word-wide DMA xfers,
*/
NIC_PUT(sc, AE_P0_DCR, AE_DCR_FT1|AE_DCR_BMS|AE_DCR_WTS);
/*
* Clear Remote Byte Count Registers
*/
NIC_PUT(sc, AE_P0_RBCR0, zero);
NIC_PUT(sc, AE_P0_RBCR1, zero);
/*
* Enable reception of broadcast packets
*/
NIC_PUT(sc, AE_P0_RCR, AE_RCR_AB);
/*
* Place NIC in internal loopback mode
*/
NIC_PUT(sc, AE_P0_TCR, AE_TCR_LB0);
/*
* Initialize transmit/receive (ring-buffer) Page Start
*/
NIC_PUT(sc, AE_P0_TPSR, sc->tx_page_start);
NIC_PUT(sc, AE_P0_PSTART, sc->rec_page_start);
/*
* Initialize Receiver (ring-buffer) Page Stop and Boundry
*/
NIC_PUT(sc, AE_P0_PSTOP, sc->rec_page_stop);
NIC_PUT(sc, AE_P0_BNRY, sc->rec_page_start);
/*
* Clear all interrupts. A '1' in each bit position clears the
* corresponding flag.
*/
NIC_PUT(sc, AE_P0_ISR, ones);
/*
* Enable the following interrupts: receive/transmit complete,
* receive/transmit error, and Receiver OverWrite.
*
* Counter overflow and Remote DMA complete are *not* enabled.
*/
NIC_PUT(sc, AE_P0_IMR,
AE_IMR_PRXE|AE_IMR_PTXE|AE_IMR_RXEE|AE_IMR_TXEE|AE_IMR_OVWE);
/*
* Program Command Register for page 1
*/
NIC_PUT(sc, AE_P0_CR, AE_CR_PAGE_1|AE_CR_RD2|AE_CR_STP);
/*
* Copy out our station address
*/
for (i = 0; i < ETHER_ADDR_LEN; ++i)
NIC_PUT(sc, AE_P1_PAR0 + i, sc->arpcom.ac_enaddr[i]);
#if NBPFILTER > 0
/*
* Initialize multicast address hashing registers to accept
* all multicasts (only used when in promiscuous mode)
*/
for (i = 0; i < 8; ++i)
NIC_PUT(sc, AE_P1_MAR0 + i, 0xff);
#endif
/*
* Set Current Page pointer to next_packet (initialized above)
*/
NIC_PUT(sc, AE_P1_CURR, sc->next_packet);
/*
* Set Command Register for page 0, Remote DMA complete,
* and interface Start.
*/
NIC_PUT(sc, AE_P1_CR, AE_CR_RD2|AE_CR_STA);
/*
* Take interface out of loopback
*/
NIC_PUT(sc, AE_P0_TCR, zero);
/*
* Set 'running' flag, and clear output active flag.
*/
ifp->if_flags |= IFF_RUNNING;
ifp->if_flags &= ~IFF_OACTIVE;
/* XXXXXX */
add_nubus_intr((int)sc->rom_addr & 0xFF000000, aeintr, sc - ae_softc);
/*
* ...and attempt to start output
*/
ae_start(ifp);
(void) splx(s);
}
/*
* This routine actually starts the transmission on the interface
*/
static inline void ae_xmit(ifp)
struct ifnet *ifp;
{
struct ae_softc *sc = &ae_softc[ifp->if_unit];
u_short len = sc->txb_next_len;
/*
* Set NIC for page 0 register access
*/
NIC_PUT(sc, AE_P0_CR, AE_CR_RD2|AE_CR_STA);
/*
* Set TX buffer start page
*/
NIC_PUT(sc, AE_P0_TPSR, sc->tx_page_start +
sc->txb_next * AE_TXBUF_SIZE);
/*
* Set TX length
*/
NIC_PUT(sc, AE_P0_TBCR0, len & 0xff);
NIC_PUT(sc, AE_P0_TBCR1, len >> 8);
/*
* Set page 0, Remote DMA complete, Transmit Packet, and *Start*
*/
NIC_PUT(sc, AE_P0_CR, AE_CR_RD2|AE_CR_TXP|AE_CR_STA);
sc->xmit_busy = 1;
sc->data_buffered = 0;
/*
* Switch buffers if we are doing double-buffered transmits
*/
if ((sc->txb_next == 0) && (sc->txb_cnt > 1))
sc->txb_next = 1;
else
sc->txb_next = 0;
/*
* Set a timer just in case we never hear from the board again
*/
ifp->if_timer = 2;
}
/*
* Start output on interface.
* We make two assumptions here:
* 1) that the current priority is set to splnet _before_ this code
* is called *and* is returned to the appropriate priority after
* return
* 2) that the IFF_OACTIVE flag is checked before this code is called
* (i.e. that the output part of the interface is idle)
*/
int
ae_start(ifp)
struct ifnet *ifp;
{
struct ae_softc *sc = &ae_softc[ifp->if_unit];
struct mbuf *m0, *m;
caddr_t buffer;
int len;
outloop:
/*
* See if there is room to send more data (i.e. one or both of the
* buffers is empty).
*/
if (sc->data_buffered)
if (sc->xmit_busy) {
/*
* No room. Indicate this to the outside world
* and exit.
*/
ifp->if_flags |= IFF_OACTIVE;
return;
} else {
/*
* Data is buffered, but we're not transmitting, so
* start the xmit on the buffered data.
* Note that ae_xmit() resets the data_buffered flag
* before returning.
*/
ae_xmit(ifp);
}
IF_DEQUEUE(&sc->arpcom.ac_if.if_snd, m);
if (m == 0) {
/*
* The following isn't pretty; we are using the !OACTIVE flag to
* indicate to the outside world that we can accept an additional
* packet rather than that the transmitter is _actually_
* active. Indeed, the transmitter may be active, but if we haven't
* filled the secondary buffer with data then we still want to
* accept more.
* Note that it isn't necessary to test the data_buffered flag -
* we wouldn't have tried to de-queue the packet in the first place
* if it was set.
*/
ifp->if_flags &= ~IFF_OACTIVE;
return;
}
/*
* Copy the mbuf chain into the transmit buffer
*/
buffer = sc->smem_start + (sc->txb_next * AE_TXBUF_SIZE * AE_PAGE_SIZE);
len = 0;
for (m0 = m; m != 0; m = m->m_next) {
/*printf("ae: copy %d bytes @ %x\n", m->m_len, buffer);*/
bbcopy(mtod(m, caddr_t), buffer, m->m_len);
buffer += m->m_len;
len += m->m_len;
}
if (len & 1) len++;
sc->txb_next_len = max(len, ETHER_MIN_LEN);
if (sc->txb_cnt > 1)
/*
* only set 'buffered' flag if doing multiple buffers
*/
sc->data_buffered = 1;
if (sc->xmit_busy == 0)
ae_xmit(ifp);
/*
* If there is BPF support in the configuration, tap off here.
* The following has support for converting trailer packets
* back to normal.
*/
#if NBPFILTER > 0
if (sc->bpf) {
u_short etype;
int off, datasize, resid;
struct ether_header *eh;
struct trailer_header {
u_short ether_type;
u_short ether_residual;
} trailer_header;
char ether_packet[ETHER_MAX_LEN];
char *ep;
ep = ether_packet;
/*
* We handle trailers below:
* Copy ether header first, then residual data,
* then data. Put all this in a temporary buffer
* 'ether_packet' and send off to bpf. Since the
* system has generated this packet, we assume
* that all of the offsets in the packet are
* correct; if they're not, the system will almost
* certainly crash in m_copydata.
* We make no assumptions about how the data is
* arranged in the mbuf chain (i.e. how much
* data is in each mbuf, if mbuf clusters are
* used, etc.), which is why we use m_copydata
* to get the ether header rather than assume
* that this is located in the first mbuf.
*/
/* copy ether header */
m_copydata(m0, 0, sizeof(struct ether_header), ep);
eh = (struct ether_header *) ep;
ep += sizeof(struct ether_header);
etype = ntohs(eh->ether_type);
if (etype >= ETHERTYPE_TRAIL &&
etype < ETHERTYPE_TRAIL+ETHERTYPE_NTRAILER) {
datasize = ((etype - ETHERTYPE_TRAIL) << 9);
off = datasize + sizeof(struct ether_header);
/* copy trailer_header into a data structure */
m_copydata(m0, off, sizeof(struct trailer_header),
&trailer_header.ether_type);
/* copy residual data */
m_copydata(m0, off+sizeof(struct trailer_header),
resid = ntohs(trailer_header.ether_residual) -
sizeof(struct trailer_header), ep);
ep += resid;
/* copy data */
m_copydata(m0, sizeof(struct ether_header),
datasize, ep);
ep += datasize;
/* restore original ether packet type */
eh->ether_type = trailer_header.ether_type;
bpf_tap(sc->bpf, ether_packet, ep - ether_packet);
} else
bpf_mtap(sc->bpf, m0);
}
#endif
m_freem(m0);
/*
* If we are doing double-buffering, a buffer might be free to
* fill with another packet, so loop back to the top.
*/
if (sc->txb_cnt > 1)
goto outloop;
else {
ifp->if_flags |= IFF_OACTIVE;
return;
}
}
/*
* Ethernet interface receiver interrupt.
*/
static inline void
ae_rint(unit)
int unit;
{
register struct ae_softc *sc = &ae_softc[unit];
u_char boundry, current;
u_short len;
struct ae_ring *packet_ptr;
/*
* Set NIC to page 1 registers to get 'current' pointer
*/
NIC_PUT(sc, AE_P0_CR, AE_CR_PAGE_1|AE_CR_RD2|AE_CR_STA);
/*
* 'sc->next_packet' is the logical beginning of the ring-buffer - i.e.
* it points to where new data has been buffered. The 'CURR'
* (current) register points to the logical end of the ring-buffer
* - i.e. it points to where additional new data will be added.
* We loop here until the logical beginning equals the logical
* end (or in other words, until the ring-buffer is empty).
*/
while (sc->next_packet != NIC_GET(sc, AE_P1_CURR)) {
/* get pointer to this buffer header structure */
packet_ptr = (struct ae_ring *)(sc->smem_ring +
(sc->next_packet - sc->rec_page_start) * AE_PAGE_SIZE);
/*
* The byte count includes the FCS - Frame Check Sequence (a
* 32 bit CRC).
*/
len = packet_ptr->count[0] | (packet_ptr->count[1] << 8);
if ((len >= ETHER_MIN_LEN) && (len <= ETHER_MAX_LEN)) {
/*
* Go get packet. len - 4 removes CRC from length.
* (packet_ptr + 1) points to data just after the packet ring
* header (+4 bytes)
*/
ae_get_packet(sc, (caddr_t)(packet_ptr + 1), len - 4);
++sc->arpcom.ac_if.if_ipackets;
} else {
/*
* Really BAD...probably indicates that the ring pointers
* are corrupted. Also seen on early rev chips under
* high load - the byte order of the length gets switched.
*/
log(LOG_ERR,
"ae%d: shared memory corrupt - invalid packet length %d\n",
unit, len);
ae_reset(unit);
return;
}
/*
* Update next packet pointer
*/
sc->next_packet = packet_ptr->next_packet;
/*
* Update NIC boundry pointer - being careful to keep it
* one buffer behind. (as recommended by NS databook)
*/
boundry = sc->next_packet - 1;
if (boundry < sc->rec_page_start)
boundry = sc->rec_page_stop - 1;
/*
* Set NIC to page 0 registers to update boundry register
*/
NIC_PUT(sc, AE_P0_CR, AE_CR_RD2|AE_CR_STA);
NIC_PUT(sc, AE_P0_BNRY, boundry);
/*
* Set NIC to page 1 registers before looping to top (prepare to
* get 'CURR' current pointer)
*/
NIC_PUT(sc, AE_P0_CR, AE_CR_PAGE_1|AE_CR_RD2|AE_CR_STA);
}
}
/*
* Ethernet interface interrupt processor
*/
int
aeintr(unit)
int unit;
{
struct ae_softc *sc = &ae_softc[unit];
u_char isr;
/*
* Set NIC to page 0 registers
*/
NIC_PUT(sc, AE_P0_CR, AE_CR_RD2|AE_CR_STA);
/*
* loop until there are no more new interrupts
*/
while (isr = NIC_GET(sc, AE_P0_ISR)) {
/*
* reset all the bits that we are 'acknowledging'
* by writing a '1' to each bit position that was set
* (writing a '1' *clears* the bit)
*/
NIC_PUT(sc, AE_P0_ISR, isr);
/*
* Handle transmitter interrupts. Handle these first
* because the receiver will reset the board under
* some conditions.
*/
if (isr & (AE_ISR_PTX|AE_ISR_TXE)) {
u_char collisions = NIC_GET(sc, AE_P0_NCR);
/*
* Check for transmit error. If a TX completed with an
* error, we end up throwing the packet away. Really
* the only error that is possible is excessive
* collisions, and in this case it is best to allow the
* automatic mechanisms of TCP to backoff the flow. Of
* course, with UDP we're screwed, but this is expected
* when a network is heavily loaded.
*/
if (isr & AE_ISR_TXE) {
/*
* Excessive collisions (16)
*/
if ((NIC_GET(sc, AE_P0_TSR) & AE_TSR_ABT)
&& (collisions == 0)) {
/*
* When collisions total 16, the
* P0_NCR will indicate 0, and the
* TSR_ABT is set.
*/
collisions = 16;
}
/*
* update output errors counter
*/
++sc->arpcom.ac_if.if_oerrors;
} else {
/*
* Update total number of successfully
* transmitted packets.
*/
++sc->arpcom.ac_if.if_opackets;
}
/*
* reset tx busy and output active flags
*/
sc->xmit_busy = 0;
sc->arpcom.ac_if.if_flags &= ~IFF_OACTIVE;
/*
* clear watchdog timer
*/
sc->arpcom.ac_if.if_timer = 0;
/*
* Add in total number of collisions on last
* transmission.
*/
sc->arpcom.ac_if.if_collisions += collisions;
/*
* If data is ready to transmit, start it transmitting,
* otherwise defer until after handling receiver
*/
if (sc->data_buffered)
ae_xmit(&sc->arpcom.ac_if);
}
/*
* Handle receiver interrupts
*/
if (isr & (AE_ISR_PRX|AE_ISR_RXE|AE_ISR_OVW)) {
/*
* Overwrite warning. In order to make sure that a lockup
* of the local DMA hasn't occurred, we reset and
* re-init the NIC. The NSC manual suggests only a
* partial reset/re-init is necessary - but some
* chips seem to want more. The DMA lockup has been
* seen only with early rev chips - Methinks this
* bug was fixed in later revs. -DG
*/
if (isr & AE_ISR_OVW) {
++sc->arpcom.ac_if.if_ierrors;
log(LOG_WARNING,
"ae%d: warning - receiver ring buffer overrun\n",
unit);
/*
* Stop/reset/re-init NIC
*/
ae_reset(unit);
} else {
/*
* Receiver Error. One or more of: CRC error, frame
* alignment error FIFO overrun, or missed packet.
*/
if (isr & AE_ISR_RXE) {
++sc->arpcom.ac_if.if_ierrors;
#ifdef AE_DEBUG
printf("ae%d: receive error %x\n", unit,
NIC_GET(sc, AE_P0_RSR));
#endif
}
/*
* Go get the packet(s)
* XXX - Doing this on an error is dubious
* because there shouldn't be any data to
* get (we've configured the interface to
* not accept packets with errors).
*/
ae_rint (unit);
}
}
/*
* If it looks like the transmitter can take more data,
* attempt to start output on the interface.
* This is done after handling the receiver to
* give the receiver priority.
*/
if ((sc->arpcom.ac_if.if_flags & IFF_OACTIVE) == 0)
ae_start(&sc->arpcom.ac_if);
/*
* return NIC CR to standard state: page 0, remote DMA complete,
* start (toggling the TXP bit off, even if was just set
* in the transmit routine, is *okay* - it is 'edge'
* triggered from low to high)
*/
NIC_PUT(sc, AE_P0_CR, AE_CR_RD2|AE_CR_STA);
/*
* If the Network Talley Counters overflow, read them to
* reset them. It appears that old 8390's won't
* clear the ISR flag otherwise - resulting in an
* infinite loop.
*/
if (isr & AE_ISR_CNT) {
(void) NIC_GET(sc, AE_P0_CNTR0);
(void) NIC_GET(sc, AE_P0_CNTR1);
(void) NIC_GET(sc, AE_P0_CNTR2);
}
}
}
/*
* Process an ioctl request. This code needs some work - it looks
* pretty ugly.
*/
int
ae_ioctl(ifp, command, data)
register struct ifnet *ifp;
int command;
caddr_t data;
{
register struct ifaddr *ifa = (struct ifaddr *)data;
struct ae_softc *sc = &ae_softc[ifp->if_unit];
struct ifreq *ifr = (struct ifreq *)data;
int s, error = 0;
s = splnet();
switch (command) {
case SIOCSIFADDR:
ifp->if_flags |= IFF_UP;
switch (ifa->ifa_addr->sa_family) {
#ifdef INET
case AF_INET:
ae_init(sc); /* before arpwhohas */
/*
* See if another station has *our* IP address.
* i.e.: There is an address conflict! If a
* conflict exists, a message is sent to the
* console.
*/
((struct arpcom *)ifp)->ac_ipaddr =
IA_SIN(ifa)->sin_addr;
arpwhohas((struct arpcom *)ifp, &IA_SIN(ifa)->sin_addr);
break;
#endif
#ifdef NS
/*
* XXX - This code is probably wrong
*/
case AF_NS:
{
register struct ns_addr *ina = &(IA_SNS(ifa)->sns_addr);
if (ns_nullhost(*ina))
ina->x_host =
*(union ns_host *)(sc->arpcom.ac_enaddr);
else {
/*
*
*/
bbcopy((caddr_t)ina->x_host.c_host,
(caddr_t)sc->arpcom.ac_enaddr,
sizeof(sc->arpcom.ac_enaddr));
}
/*
* Set new address
*/
ae_init(sc);
break;
}
#endif
default:
ae_init(sc);
break;
}
break;
case SIOCSIFFLAGS:
/*
* If interface is marked down and it is running, then stop it
*/
if (((ifp->if_flags & IFF_UP) == 0) &&
(ifp->if_flags & IFF_RUNNING)) {
ae_stop(ifp->if_unit);
ifp->if_flags &= ~IFF_RUNNING;
} else {
/*
* If interface is marked up and it is stopped, then start it
*/
if ((ifp->if_flags & IFF_UP) &&
((ifp->if_flags & IFF_RUNNING) == 0))
ae_init(sc);
}
#if NBPFILTER > 0
if (ifp->if_flags & IFF_PROMISC) {
/*
* Set promiscuous mode on interface.
* XXX - for multicasts to work, we would need to
* write 1's in all bits of multicast
* hashing array. For now we assume that
* this was done in ae_init().
*/
NIC_PUT(sc, AE_P0_RCR,
AE_RCR_PRO|AE_RCR_AM|AE_RCR_AB);
} else {
/*
* XXX - for multicasts to work, we would need to
* rewrite the multicast hashing array with the
* proper hash (would have been destroyed above).
*/
NIC_PUT(sc, AE_P0_RCR, AE_RCR_AB);
}
#endif
break;
default:
error = EINVAL;
}
(void) splx(s);
return (error);
}
/*
* Macro to calculate a new address within shared memory when given an offset
* from an address, taking into account ring-wrap.
*/
#define ringoffset(sc, start, off, type) \
((type)( ((caddr_t)(start)+(off) >= (sc)->smem_end) ? \
(((caddr_t)(start)+(off))) - (sc)->smem_end \
+ (sc)->smem_ring: \
((caddr_t)(start)+(off)) ))
/*
* Retreive packet from shared memory and send to the next level up via
* ether_input(). If there is a BPF listener, give a copy to BPF, too.
*/
ae_get_packet(sc, buf, len)
struct ae_softc *sc;
char *buf;
u_short len;
{
struct ether_header *eh;
struct mbuf *m, *head, *ae_ring_to_mbuf();
u_short off;
int resid;
u_short etype;
struct trailer_header {
u_short trail_type;
u_short trail_residual;
} trailer_header;
/* Allocate a header mbuf */
MGETHDR(m, M_DONTWAIT, MT_DATA);
if (m == 0)
goto bad;
m->m_pkthdr.rcvif = &sc->arpcom.ac_if;
m->m_pkthdr.len = len;
m->m_len = 0;
head = m;
eh = (struct ether_header *)buf;
/* The following sillines is to make NFS happy */
#define EROUND ((sizeof(struct ether_header) + 3) & ~3)
#define EOFF (EROUND - sizeof(struct ether_header))
/*
* The following assumes there is room for
* the ether header in the header mbuf
*/
head->m_data += EOFF;
bbcopy(buf, mtod(head, caddr_t), sizeof(struct ether_header));
buf += sizeof(struct ether_header);
head->m_len += sizeof(struct ether_header);
len -= sizeof(struct ether_header);
etype = ntohs((u_short)eh->ether_type);
/*
* Deal with trailer protocol:
* If trailer protocol, calculate the datasize as 'off',
* which is also the offset to the trailer header.
* Set resid to the amount of packet data following the
* trailer header.
* Finally, copy residual data into mbuf chain.
*/
if (etype >= ETHERTYPE_TRAIL &&
etype < ETHERTYPE_TRAIL+ETHERTYPE_NTRAILER) {
off = (etype - ETHERTYPE_TRAIL) << 9;
if ((off + sizeof(struct trailer_header)) > len)
goto bad; /* insanity */
eh->ether_type = *ringoffset(sc, buf, off, u_short *);
resid = ntohs(*ringoffset(sc, buf, off+2, u_short *));
if ((off + resid) > len) goto bad; /* insanity */
resid -= sizeof(struct trailer_header);
if (resid < 0) goto bad; /* insanity */
m = ae_ring_to_mbuf(sc, ringoffset(sc, buf, off+4, char *), head, resid);
if (m == 0) goto bad;
len = off;
head->m_pkthdr.len -= 4; /* subtract trailer header */
}
/*
* Pull packet off interface. Or if this was a trailer packet,
* the data portion is appended.
*/
m = ae_ring_to_mbuf(sc, buf, m, len);
if (m == 0) goto bad;
#if NBPFILTER > 0
/*
* Check if there's a BPF listener on this interface.
* If so, hand off the raw packet to bpf.
*/
if (sc->bpf) {
bpf_mtap(sc->bpf, head);
/*
* Note that the interface cannot be in promiscuous mode if
* there are no BPF listeners. And if we are in promiscuous
* mode, we have to check if this packet is really ours.
*
* XXX This test does not support multicasts.
*/
if ((sc->arpcom.ac_if.if_flags & IFF_PROMISC) &&
bcmp(eh->ether_dhost, sc->arpcom.ac_enaddr,
sizeof(eh->ether_dhost)) != 0 &&
bcmp(eh->ether_dhost, etherbroadcastaddr,
sizeof(eh->ether_dhost)) != 0) {
m_freem(head);
return;
}
}
#endif
/*
* Fix up data start offset in mbuf to point past ether header
*/
m_adj(head, sizeof(struct ether_header));
ether_input(&sc->arpcom.ac_if, eh, head);
return;
bad: if (head)
m_freem(head);
return;
}
/*
* Supporting routines
*/
/*
* Given a source and destination address, copy 'amount' of a packet from
* the ring buffer into a linear destination buffer. Takes into account
* ring-wrap.
*/
static inline char *
ae_ring_copy(sc,src,dst,amount)
struct ae_softc *sc;
char *src;
char *dst;
u_short amount;
{
u_short tmp_amount;
/* does copy wrap to lower addr in ring buffer? */
if (src + amount > sc->smem_end) {
tmp_amount = sc->smem_end - src;
bbcopy(src, dst, tmp_amount);/* copy amount up to end of smem */
amount -= tmp_amount;
src = sc->smem_ring;
dst += tmp_amount;
}
bbcopy(src, dst, amount);
return(src + amount);
}
/*
* Copy data from receive buffer to end of mbuf chain
* allocate additional mbufs as needed. return pointer
* to last mbuf in chain.
* sc = ed info (softc)
* src = pointer in ed ring buffer
* dst = pointer to last mbuf in mbuf chain to copy to
* amount = amount of data to copy
*/
struct mbuf *
ae_ring_to_mbuf(sc,src,dst,total_len)
struct ae_softc *sc;
char *src;
struct mbuf *dst;
u_short total_len;
{
register struct mbuf *m = dst;
while (total_len) {
register u_short amount = min(total_len, M_TRAILINGSPACE(m));
if (amount == 0) { /* no more data in this mbuf, alloc another */
/*
* If there is enough data for an mbuf cluster, attempt
* to allocate one of those, otherwise, a regular
* mbuf will do.
* Note that a regular mbuf is always required, even if
* we get a cluster - getting a cluster does not
* allocate any mbufs, and one is needed to assign
* the cluster to. The mbuf that has a cluster
* extension can not be used to contain data - only
* the cluster can contain data.
*/
dst = m;
MGET(m, M_DONTWAIT, MT_DATA);
if (m == 0)
return (0);
if (total_len >= MINCLSIZE)
MCLGET(m, M_DONTWAIT);
m->m_len = 0;
dst->m_next = m;
amount = min(total_len, M_TRAILINGSPACE(m));
}
src = ae_ring_copy(sc, src, mtod(m, caddr_t) + m->m_len, amount);
m->m_len += amount;
total_len -= amount;
}
return (m);
}
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