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[unix-history] / sys / i386 / isa / if_ed.c
/*
* Device driver for National Semiconductor DS8390/WD83C690 based ethernet
* adapters. 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.
*
* Currently supports the Western Digital/SMC 8003 and 8013 series,
* the SMC Elite Ultra (8216), the 3Com 3c503, the NE1000 and NE2000,
* and a variety of similar clones.
*
* Thanks to Charles Hannum for proving to me with example code that the
* NE1000/2000 support could be added with minimal impact. Without
* this, I wouldn't have proceeded in this direction.
*
*/
/*
* $Id: if_ed.c,v 1.26 1993/12/19 00:50:37 wollman Exp $
*/
#include "ed.h"
#if NED > 0
/* bpfilter included here in case it is needed in future net includes */
#include "bpfilter.h"
#include "param.h"
#include "systm.h"
#include "errno.h"
#include "ioctl.h"
#include "mbuf.h"
#include "socket.h"
#include "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 "i386/isa/isa.h"
#include "i386/isa/isa_device.h"
#include "i386/isa/icu.h"
#include "i386/isa/if_edreg.h"
#include "i386/include/pio.h"
/* For backwards compatibility */
#ifndef IFF_ALTPHYS
#define IFF_ALTPHYS IFF_LLC0
#endif
/*
* ed_softc: per line info and status
*/
struct ed_softc {
struct arpcom arpcom; /* ethernet common */
char *type_str; /* pointer to type string */
u_char vendor; /* interface vendor */
u_char type; /* interface type code */
u_short asic_addr; /* ASIC I/O bus address */
u_short nic_addr; /* NIC (DS8390) I/O bus address */
/*
* The following 'proto' variable is part of a work-around for 8013EBT asics
* being write-only. It's sort of a prototype/shadow of the real thing.
*/
u_char wd_laar_proto;
u_char isa16bit; /* width of access to card 0=8 or 1=16 */
int is790; /* set by the probe code if the card is 790 based */
caddr_t bpf; /* BPF "magic cookie" */
caddr_t mem_start; /* NIC memory start address */
caddr_t mem_end; /* NIC memory end address */
u_long mem_size; /* total NIC memory size */
caddr_t mem_ring; /* start of RX ring-buffer (in NIC mem) */
u_char mem_shared; /* NIC memory is shared with host */
u_char xmit_busy; /* transmitter is busy */
u_char txb_cnt; /* number of transmit buffers */
u_char txb_inuse; /* number of TX buffers currently in-use*/
u_char txb_new; /* pointer to where new buffer will be added */
u_char txb_next_tx; /* pointer to next buffer ready to xmit */
u_short txb_len[8]; /* buffered xmit buffer lengths */
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 */
} ed_softc[NED];
int ed_attach(struct isa_device *);
void ed_init(int);
void edintr(int);
int ed_ioctl(struct ifnet *, int, caddr_t);
int ed_probe(struct isa_device *);
void ed_start(struct ifnet *);
void ed_reset(int, int);
void ed_watchdog(int);
static void ed_get_packet(struct ed_softc *, char *, int /*u_short*/);
static void ed_stop(int);
static inline void ed_rint();
static inline void ed_xmit();
static inline char *ed_ring_copy();
void ed_pio_readmem(), ed_pio_writemem();
u_short ed_pio_write_mbufs();
extern int ether_output();
struct trailer_header {
u_short ether_type;
u_short ether_residual;
};
struct isa_driver eddriver = {
ed_probe,
ed_attach,
"ed"
};
/*
* Interrupt conversion table for WD/SMC ASIC
* (IRQ* are defined in icu.h)
*/
static unsigned short ed_intr_mask[] = {
IRQ9,
IRQ3,
IRQ5,
IRQ7,
IRQ10,
IRQ11,
IRQ15,
IRQ4
};
/*
* Interrupt conversion table for 585/790 Combo
*/
static unsigned short ed_790_intr_mask[] = {
0,
IRQ9,
IRQ3,
IRQ4,
IRQ5,
IRQ10,
IRQ11,
IRQ15
};
#define ETHER_MIN_LEN 64
#define ETHER_MAX_LEN 1518
#define ETHER_ADDR_LEN 6
#define ETHER_HDR_SIZE 14
/*
* Determine if the device is present
*
* on entry:
* a pointer to an isa_device struct
* on exit:
* NULL if device not found
* or # of i/o addresses used (if found)
*/
int
ed_probe(isa_dev)
struct isa_device *isa_dev;
{
struct ed_softc *sc = &ed_softc[isa_dev->id_unit];
int nports;
if (nports = ed_probe_WD80x3(isa_dev))
return (nports);
if (nports = ed_probe_3Com(isa_dev))
return (nports);
if (nports = ed_probe_Novell(isa_dev))
return (nports);
return(0);
}
/*
* Generic probe routine for testing for the existance of a DS8390.
* Must be called after the NIC has just been reset. This routine
* works by looking at certain register values that are gauranteed
* to be initialized a certain way after power-up or reset. Seems
* not to currently work on the 83C690.
*
* Specifically:
*
* Register reset bits set bits
* Command Register (CR) TXP, STA RD2, STP
* Interrupt Status (ISR) RST
* Interrupt Mask (IMR) All bits
* Data Control (DCR) LAS
* Transmit Config. (TCR) LB1, LB0
*
* We only look at the CR and ISR registers, however, because looking at
* the others would require changing register pages (which would be
* intrusive if this isn't an 8390).
*
* Return 1 if 8390 was found, 0 if not.
*/
int
ed_probe_generic8390(sc)
struct ed_softc *sc;
{
if ((inb(sc->nic_addr + ED_P0_CR) &
(ED_CR_RD2|ED_CR_TXP|ED_CR_STA|ED_CR_STP)) !=
(ED_CR_RD2|ED_CR_STP))
return (0);
if ((inb(sc->nic_addr + ED_P0_ISR) & ED_ISR_RST) != ED_ISR_RST)
return (0);
return(1);
}
/*
* Probe and vendor-specific initialization routine for SMC/WD80x3 boards
*/
int
ed_probe_WD80x3(isa_dev)
struct isa_device *isa_dev;
{
struct ed_softc *sc = &ed_softc[isa_dev->id_unit];
int i;
u_int memsize;
u_char iptr, isa16bit, sum;
sc->asic_addr = isa_dev->id_iobase;
sc->nic_addr = sc->asic_addr + ED_WD_NIC_OFFSET;
sc->is790 = 0;
/*
* Attempt to do a checksum over the station address PROM.
* If it fails, it's probably not a SMC/WD board. There
* is a problem with this, though: some clone WD boards
* don't pass the checksum test. Danpex boards for one.
*/
for (sum = 0, i = 0; i < 8; ++i)
sum += inb(sc->asic_addr + ED_WD_PROM + i);
if (sum != ED_WD_ROM_CHECKSUM_TOTAL) {
/*
* Checksum is invalid. This often happens with cheap
* WD8003E clones. In this case, the checksum byte
* (the eighth byte) seems to always be zero.
*/
if (inb(sc->asic_addr + ED_WD_CARD_ID) != ED_TYPE_WD8003E ||
inb(sc->asic_addr + ED_WD_PROM + 7) != 0)
return(0);
}
/* reset card to force it into a known state. */
outb(sc->asic_addr + ED_WD_MSR, ED_WD_MSR_RST);
DELAY(100);
outb(sc->asic_addr + ED_WD_MSR, inb(sc->asic_addr + ED_WD_MSR) & ~ED_WD_MSR_RST);
/* wait in the case this card is reading it's EEROM */
DELAY(5000);
sc->vendor = ED_VENDOR_WD_SMC;
sc->type = inb(sc->asic_addr + ED_WD_CARD_ID);
/*
* Set initial values for width/size.
*/
switch (sc->type) {
case ED_TYPE_WD8003S:
sc->type_str = "WD8003S";
memsize = 8192;
isa16bit = 0;
break;
case ED_TYPE_WD8003E:
sc->type_str = "WD8003E";
memsize = 8192;
isa16bit = 0;
break;
case ED_TYPE_WD8013EBT:
sc->type_str = "WD8013EBT";
memsize = 16384;
isa16bit = 1;
break;
case ED_TYPE_WD8013W:
sc->type_str = "WD8013W";
memsize = 16384;
isa16bit = 1;
break;
case ED_TYPE_WD8013EP: /* also WD8003EP */
if (inb(sc->asic_addr + ED_WD_ICR)
& ED_WD_ICR_16BIT) {
isa16bit = 1;
memsize = 16384;
sc->type_str = "WD8013EP";
} else {
isa16bit = 0;
memsize = 8192;
sc->type_str = "WD8003EP";
}
break;
case ED_TYPE_WD8013WC:
sc->type_str = "WD8013WC";
memsize = 16384;
isa16bit = 1;
break;
case ED_TYPE_WD8013EBP:
sc->type_str = "WD8013EBP";
memsize = 16384;
isa16bit = 1;
break;
case ED_TYPE_WD8013EPC:
sc->type_str = "WD8013EPC";
memsize = 16384;
isa16bit = 1;
break;
case ED_TYPE_SMC8216C:
sc->type_str = "SMC8216/SMC8216C";
memsize = 16384;
isa16bit = 1;
sc->is790 = 1;
break;
case ED_TYPE_SMC8216T:
sc->type_str = "SMC8216T";
memsize = 16384;
isa16bit = 1;
sc->is790 = 1;
break;
default:
sc->type_str = "";
memsize = 8192;
isa16bit = 0;
break;
}
/*
* Make some adjustments to initial values depending on what is
* found in the ICR.
*/
if (isa16bit && (sc->type != ED_TYPE_WD8013EBT)
&& ((inb(sc->asic_addr + ED_WD_ICR) & ED_WD_ICR_16BIT) == 0)) {
isa16bit = 0;
memsize = 8192;
}
#if ED_DEBUG
printf("type=%s isa16bit=%d memsize=%d id_msize=%d\n",
sc->type_str,isa16bit,memsize,isa_dev->id_msize);
for (i=0; i<8; i++)
printf("%x -> %x\n", i, inb(sc->asic_addr + i));
#endif
/*
* Allow the user to override the autoconfiguration
*/
if (isa_dev->id_msize)
memsize = isa_dev->id_msize;
/*
* (note that if the user specifies both of the following flags
* that '8bit' mode intentionally has precedence)
*/
if (isa_dev->id_flags & ED_FLAGS_FORCE_16BIT_MODE)
isa16bit = 1;
if (isa_dev->id_flags & ED_FLAGS_FORCE_8BIT_MODE)
isa16bit = 0;
/*
* Check 83C584 interrupt configuration register if this board has one
* XXX - we could also check the IO address register. But why
* bother...if we get past this, it *has* to be correct.
*/
if ((sc->type & ED_WD_SOFTCONFIG) && (!sc->is790)) {
/*
* Assemble together the encoded interrupt number.
*/
iptr = (inb(isa_dev->id_iobase + ED_WD_ICR) & ED_WD_ICR_IR2) |
((inb(isa_dev->id_iobase + ED_WD_IRR) &
(ED_WD_IRR_IR0 | ED_WD_IRR_IR1)) >> 5);
/*
* Translate it using translation table, and check for correctness.
*/
if (ed_intr_mask[iptr] != isa_dev->id_irq) {
printf("ed%d: kernel configured irq %d doesn't match board configured irq %d\n",
isa_dev->id_unit, ffs(isa_dev->id_irq) - 1, ffs(ed_intr_mask[iptr]) - 1);
return(0);
}
/*
* Enable the interrupt.
*/
outb(isa_dev->id_iobase + ED_WD_IRR,
inb(isa_dev->id_iobase + ED_WD_IRR) | ED_WD_IRR_IEN);
}
if (sc->is790) {
outb(isa_dev->id_iobase + 0x04, inb(isa_dev->id_iobase + 0x04) | 0x80);
iptr = ((inb(isa_dev->id_iobase + 0x0d) & 0x0c ) >> 2) |
((inb(isa_dev->id_iobase + 0x0d) & 0x40) >> 4);
outb(isa_dev->id_iobase + 0x04, inb(isa_dev->id_iobase + 0x04) & ~0x80);
if (ed_790_intr_mask[iptr] != isa_dev->id_irq) {
printf("ed%d: kernel configured irq %d doesn't match board configured irq %d %d\n",
isa_dev->id_unit, ffs(isa_dev->id_irq) - 1, ffs(ed_790_intr_mask[iptr]) -1, iptr);
return 0;
}
outb(isa_dev->id_iobase + 0x06, inb(isa_dev->id_iobase + 0x06) | 0x01);
}
sc->isa16bit = isa16bit;
#ifdef notyet /* XXX - I'm not sure if PIO mode is even possible on WD/SMC boards */
/*
* The following allows the WD/SMC boards to be used in Programmed I/O
* mode - without mapping the NIC memory shared. ...Not the prefered
* way, but it might be the only way.
*/
if (isa_dev->id_flags & ED_FLAGS_FORCE_PIO) {
sc->mem_shared = 0;
isa_dev->id_maddr = 0;
} else {
sc->mem_shared = 1;
}
#else
sc->mem_shared = 1;
#endif
isa_dev->id_msize = memsize;
sc->mem_start = (caddr_t)isa_dev->id_maddr;
/*
* allocate one xmit buffer if < 16k, two buffers otherwise
*/
if ((memsize < 16384) || (isa_dev->id_flags & ED_FLAGS_NO_MULTI_BUFFERING)) {
sc->mem_ring = sc->mem_start + (ED_PAGE_SIZE * ED_TXBUF_SIZE);
sc->txb_cnt = 1;
sc->rec_page_start = ED_TXBUF_SIZE;
} else {
sc->mem_ring = sc->mem_start + (ED_PAGE_SIZE * ED_TXBUF_SIZE * 2);
sc->txb_cnt = 2;
sc->rec_page_start = ED_TXBUF_SIZE * 2;
}
sc->mem_size = memsize;
sc->mem_end = sc->mem_start + memsize;
sc->rec_page_stop = memsize / ED_PAGE_SIZE;
sc->tx_page_start = ED_WD_PAGE_OFFSET;
/*
* Get station address from on-board ROM
*/
for (i = 0; i < ETHER_ADDR_LEN; ++i)
sc->arpcom.ac_enaddr[i] = inb(sc->asic_addr + ED_WD_PROM + i);
if (sc->mem_shared) {
/*
* Set address and enable interface shared memory.
*/
if(!sc->is790) {
outb(sc->asic_addr + ED_WD_MSR, ((kvtop(sc->mem_start) >> 13) &
ED_WD_MSR_ADDR) | ED_WD_MSR_MENB);
} else {
outb(sc->asic_addr + ED_WD_MSR, ED_WD_MSR_MENB);
outb(sc->asic_addr + 0x04, (inb(sc->asic_addr + 0x04) | 0x80));
outb(sc->asic_addr + 0x0b, ((kvtop(sc->mem_start) >> 13) & 0x0f) |
((kvtop(sc->mem_start) >> 11) & 0x40) |
(inb(sc->asic_addr + 0x0b) & 0xb0));
outb(sc->asic_addr + 0x04, (inb(sc->asic_addr + 0x04) & ~0x80));
}
/*
* Set upper address bits and 8/16 bit access to shared memory
*/
if (isa16bit) {
if (sc->is790) {
sc->wd_laar_proto = inb(sc->asic_addr + ED_WD_LAAR);
outb(sc->asic_addr + ED_WD_LAAR, ED_WD_LAAR_M16EN);
} else {
outb(sc->asic_addr + ED_WD_LAAR, (sc->wd_laar_proto =
ED_WD_LAAR_L16EN | ED_WD_LAAR_M16EN |
((kvtop(sc->mem_start) >> 19) & ED_WD_LAAR_ADDRHI)));
}
} else {
if ((sc->type & ED_WD_SOFTCONFIG) ||
(sc->type == ED_TYPE_WD8013EBT) && (!sc->is790)) {
outb(sc->asic_addr + ED_WD_LAAR, (sc->wd_laar_proto =
((kvtop(sc->mem_start) >> 19) & ED_WD_LAAR_ADDRHI)));
}
}
/*
* Now zero memory and verify that it is clear
*/
bzero(sc->mem_start, memsize);
for (i = 0; i < memsize; ++i)
if (sc->mem_start[i]) {
printf("ed%d: failed to clear shared memory at %x - check configuration\n",
isa_dev->id_unit, kvtop(sc->mem_start + i));
/*
* Disable 16 bit access to shared memory
*/
if (isa16bit)
outb(sc->asic_addr + ED_WD_LAAR, (sc->wd_laar_proto &=
~ED_WD_LAAR_M16EN));
return(0);
}
/*
* Disable 16bit access to shared memory - we leave it disabled so
* that 1) machines reboot properly when the board is set
* 16 bit mode and there are conflicting 8bit devices/ROMS
* in the same 128k address space as this boards shared
* memory. and 2) so that other 8 bit devices with shared
* memory can be used in this 128k region, too.
*/
if (isa16bit)
outb(sc->asic_addr + ED_WD_LAAR, (sc->wd_laar_proto &=
~ED_WD_LAAR_M16EN));
}
return (ED_WD_IO_PORTS);
}
/*
* Probe and vendor-specific initialization routine for 3Com 3c503 boards
*/
int
ed_probe_3Com(isa_dev)
struct isa_device *isa_dev;
{
struct ed_softc *sc = &ed_softc[isa_dev->id_unit];
int i;
u_int memsize;
u_char isa16bit, sum;
sc->asic_addr = isa_dev->id_iobase + ED_3COM_ASIC_OFFSET;
sc->nic_addr = isa_dev->id_iobase + ED_3COM_NIC_OFFSET;
/*
* Verify that the kernel configured I/O address matches the board
* configured address
*/
switch (inb(sc->asic_addr + ED_3COM_BCFR)) {
case ED_3COM_BCFR_300:
if (isa_dev->id_iobase != 0x300)
return(0);
break;
case ED_3COM_BCFR_310:
if (isa_dev->id_iobase != 0x310)
return(0);
break;
case ED_3COM_BCFR_330:
if (isa_dev->id_iobase != 0x330)
return(0);
break;
case ED_3COM_BCFR_350:
if (isa_dev->id_iobase != 0x350)
return(0);
break;
case ED_3COM_BCFR_250:
if (isa_dev->id_iobase != 0x250)
return(0);
break;
case ED_3COM_BCFR_280:
if (isa_dev->id_iobase != 0x280)
return(0);
break;
case ED_3COM_BCFR_2A0:
if (isa_dev->id_iobase != 0x2a0)
return(0);
break;
case ED_3COM_BCFR_2E0:
if (isa_dev->id_iobase != 0x2e0)
return(0);
break;
default:
return(0);
}
/*
* Verify that the kernel shared memory address matches the
* board configured address.
*/
switch (inb(sc->asic_addr + ED_3COM_PCFR)) {
case ED_3COM_PCFR_DC000:
if (kvtop(isa_dev->id_maddr) != 0xdc000)
return(0);
break;
case ED_3COM_PCFR_D8000:
if (kvtop(isa_dev->id_maddr) != 0xd8000)
return(0);
break;
case ED_3COM_PCFR_CC000:
if (kvtop(isa_dev->id_maddr) != 0xcc000)
return(0);
break;
case ED_3COM_PCFR_C8000:
if (kvtop(isa_dev->id_maddr) != 0xc8000)
return(0);
break;
default:
return(0);
}
/*
* Reset NIC and ASIC. Enable on-board transceiver throughout reset
* sequence because it'll lock up if the cable isn't connected
* if we don't.
*/
outb(sc->asic_addr + ED_3COM_CR, ED_3COM_CR_RST | ED_3COM_CR_XSEL);
/*
* Wait for a while, then un-reset it
*/
DELAY(50);
/*
* The 3Com ASIC defaults to rather strange settings for the CR after
* a reset - it's important to set it again after the following
* outb (this is done when we map the PROM below).
*/
outb(sc->asic_addr + ED_3COM_CR, ED_3COM_CR_XSEL);
/*
* Wait a bit for the NIC to recover from the reset
*/
DELAY(5000);
sc->vendor = ED_VENDOR_3COM;
sc->type_str = "3c503";
sc->mem_shared = 1;
/*
* Hmmm...a 16bit 3Com board has 16k of memory, but only an 8k
* window to it.
*/
memsize = 8192;
/*
* Get station address from on-board ROM
*/
/*
* First, map ethernet address PROM over the top of where the NIC
* registers normally appear.
*/
outb(sc->asic_addr + ED_3COM_CR, ED_3COM_CR_EALO | ED_3COM_CR_XSEL);
for (i = 0; i < ETHER_ADDR_LEN; ++i)
sc->arpcom.ac_enaddr[i] = inb(sc->nic_addr + i);
/*
* Unmap PROM - select NIC registers. The proper setting of the
* tranceiver is set in ed_init so that the attach code
* is given a chance to set the default based on a compile-time
* config option
*/
outb(sc->asic_addr + ED_3COM_CR, ED_3COM_CR_XSEL);
/*
* Determine if this is an 8bit or 16bit board
*/
/*
* select page 0 registers
*/
outb(sc->nic_addr + ED_P0_CR, ED_CR_RD2|ED_CR_STP);
/*
* Attempt to clear WTS bit. If it doesn't clear, then this is a
* 16bit board.
*/
outb(sc->nic_addr + ED_P0_DCR, 0);
/*
* select page 2 registers
*/
outb(sc->nic_addr + ED_P0_CR, ED_CR_PAGE_2|ED_CR_RD2|ED_CR_STP);
/*
* The 3c503 forces the WTS bit to a one if this is a 16bit board
*/
if (inb(sc->nic_addr + ED_P2_DCR) & ED_DCR_WTS)
isa16bit = 1;
else
isa16bit = 0;
/*
* select page 0 registers
*/
outb(sc->nic_addr + ED_P2_CR, ED_CR_RD2|ED_CR_STP);
sc->mem_start = (caddr_t)isa_dev->id_maddr;
sc->mem_size = memsize;
sc->mem_end = sc->mem_start + memsize;
/*
* We have an entire 8k window to put the transmit buffers on the
* 16bit boards. But since the 16bit 3c503's shared memory
* is only fast enough to overlap the loading of one full-size
* packet, trying to load more than 2 buffers can actually
* leave the transmitter idle during the load. So 2 seems
* the best value. (Although a mix of variable-sized packets
* might change this assumption. Nonetheless, we optimize for
* linear transfers of same-size packets.)
*/
if (isa16bit) {
if (isa_dev->id_flags & ED_FLAGS_NO_MULTI_BUFFERING)
sc->txb_cnt = 1;
else
sc->txb_cnt = 2;
sc->tx_page_start = ED_3COM_TX_PAGE_OFFSET_16BIT;
sc->rec_page_start = ED_3COM_RX_PAGE_OFFSET_16BIT;
sc->rec_page_stop = memsize / ED_PAGE_SIZE +
ED_3COM_RX_PAGE_OFFSET_16BIT;
sc->mem_ring = sc->mem_start;
} else {
sc->txb_cnt = 1;
sc->tx_page_start = ED_3COM_TX_PAGE_OFFSET_8BIT;
sc->rec_page_start = ED_TXBUF_SIZE + ED_3COM_TX_PAGE_OFFSET_8BIT;
sc->rec_page_stop = memsize / ED_PAGE_SIZE +
ED_3COM_TX_PAGE_OFFSET_8BIT;
sc->mem_ring = sc->mem_start + (ED_PAGE_SIZE * ED_TXBUF_SIZE);
}
sc->isa16bit = isa16bit;
/*
* Initialize GA page start/stop registers. Probably only needed
* if doing DMA, but what the hell.
*/
outb(sc->asic_addr + ED_3COM_PSTR, sc->rec_page_start);
outb(sc->asic_addr + ED_3COM_PSPR, sc->rec_page_stop);
/*
* Set IRQ. 3c503 only allows a choice of irq 2-5.
*/
switch (isa_dev->id_irq) {
case IRQ2:
outb(sc->asic_addr + ED_3COM_IDCFR, ED_3COM_IDCFR_IRQ2);
break;
case IRQ3:
outb(sc->asic_addr + ED_3COM_IDCFR, ED_3COM_IDCFR_IRQ3);
break;
case IRQ4:
outb(sc->asic_addr + ED_3COM_IDCFR, ED_3COM_IDCFR_IRQ4);
break;
case IRQ5:
outb(sc->asic_addr + ED_3COM_IDCFR, ED_3COM_IDCFR_IRQ5);
break;
default:
printf("ed%d: Invalid irq configuration (%d) must be 2-5 for 3c503\n",
isa_dev->id_unit, ffs(isa_dev->id_irq) - 1);
return(0);
}
/*
* Initialize GA configuration register. Set bank and enable shared mem.
*/
outb(sc->asic_addr + ED_3COM_GACFR, ED_3COM_GACFR_RSEL |
ED_3COM_GACFR_MBS0);
/*
* Initialize "Vector Pointer" registers. These gawd-awful things
* are compared to 20 bits of the address on ISA, and if they
* match, the shared memory is disabled. We set them to
* 0xffff0...allegedly the reset vector.
*/
outb(sc->asic_addr + ED_3COM_VPTR2, 0xff);
outb(sc->asic_addr + ED_3COM_VPTR1, 0xff);
outb(sc->asic_addr + ED_3COM_VPTR0, 0x00);
/*
* Zero memory and verify that it is clear
*/
bzero(sc->mem_start, memsize);
for (i = 0; i < memsize; ++i)
if (sc->mem_start[i]) {
printf("ed%d: failed to clear shared memory at %x - check configuration\n",
isa_dev->id_unit, kvtop(sc->mem_start + i));
return(0);
}
isa_dev->id_msize = memsize;
return(ED_3COM_IO_PORTS);
}
/*
* Probe and vendor-specific initialization routine for NE1000/2000 boards
*/
int
ed_probe_Novell(isa_dev)
struct isa_device *isa_dev;
{
struct ed_softc *sc = &ed_softc[isa_dev->id_unit];
u_int memsize, n;
u_char romdata[16], isa16bit = 0, tmp;
static char test_pattern[32] = "THIS is A memory TEST pattern";
char test_buffer[32];
sc->asic_addr = isa_dev->id_iobase + ED_NOVELL_ASIC_OFFSET;
sc->nic_addr = isa_dev->id_iobase + ED_NOVELL_NIC_OFFSET;
/* XXX - do Novell-specific probe here */
/* Reset the board */
tmp = inb(sc->asic_addr + ED_NOVELL_RESET);
/*
* I don't know if this is necessary; probably cruft leftover from
* Clarkson packet driver code. Doesn't do a thing on the boards
* I've tested. -DG [note that a outb(0x84, 0) seems to work
* here, and is non-invasive...but some boards don't seem to reset
* and I don't have complete documentation on what the 'right'
* thing to do is...so we do the invasive thing for now. Yuck.]
*/
outb(sc->asic_addr + ED_NOVELL_RESET, tmp);
DELAY(5000);
/*
* This is needed because some NE clones apparently don't reset the
* NIC properly (or the NIC chip doesn't reset fully on power-up)
* XXX - this makes the probe invasive! ...Done against my better
* judgement. -DLG
*/
outb(sc->nic_addr + ED_P0_CR, ED_CR_RD2|ED_CR_STP);
DELAY(5000);
/* Make sure that we really have an 8390 based board */
if (!ed_probe_generic8390(sc))
return(0);
sc->vendor = ED_VENDOR_NOVELL;
sc->mem_shared = 0;
isa_dev->id_maddr = 0;
/*
* Test the ability to read and write to the NIC memory. This has
* the side affect of determining if this is an NE1000 or an NE2000.
*/
/*
* This prevents packets from being stored in the NIC memory when
* the readmem routine turns on the start bit in the CR.
*/
outb(sc->nic_addr + ED_P0_RCR, ED_RCR_MON);
/* Temporarily initialize DCR for byte operations */
outb(sc->nic_addr + ED_P0_DCR, ED_DCR_FT1|ED_DCR_LS);
outb(sc->nic_addr + ED_P0_PSTART, 8192 / ED_PAGE_SIZE);
outb(sc->nic_addr + ED_P0_PSTOP, 16384 / ED_PAGE_SIZE);
sc->isa16bit = 0;
/*
* Write a test pattern in byte mode. If this fails, then there
* probably isn't any memory at 8k - which likely means
* that the board is an NE2000.
*/
ed_pio_writemem(sc, test_pattern, 8192, sizeof(test_pattern));
ed_pio_readmem(sc, 8192, test_buffer, sizeof(test_pattern));
if (bcmp(test_pattern, test_buffer, sizeof(test_pattern))) {
/* not an NE1000 - try NE2000 */
outb(sc->nic_addr + ED_P0_DCR, ED_DCR_WTS|ED_DCR_FT1|ED_DCR_LS);
outb(sc->nic_addr + ED_P0_PSTART, 16384 / ED_PAGE_SIZE);
outb(sc->nic_addr + ED_P0_PSTOP, 32768 / ED_PAGE_SIZE);
sc->isa16bit = 1;
/*
* Write a test pattern in word mode. If this also fails, then
* we don't know what this board is.
*/
ed_pio_writemem(sc, test_pattern, 16384, sizeof(test_pattern));
ed_pio_readmem(sc, 16384, test_buffer, sizeof(test_pattern));
if (bcmp(test_pattern, test_buffer, sizeof(test_pattern)))
return(0); /* not an NE2000 either */
sc->type = ED_TYPE_NE2000;
sc->type_str = "NE2000";
} else {
sc->type = ED_TYPE_NE1000;
sc->type_str = "NE1000";
}
/* 8k of memory plus an additional 8k if 16bit */
memsize = 8192 + sc->isa16bit * 8192;
#if 0 /* probably not useful - NE boards only come two ways */
/* allow kernel config file overrides */
if (isa_dev->id_msize)
memsize = isa_dev->id_msize;
#endif
sc->mem_size = memsize;
/* NIC memory doesn't start at zero on an NE board */
/* The start address is tied to the bus width */
sc->mem_start = (char *) 8192 + sc->isa16bit * 8192;
sc->mem_end = sc->mem_start + memsize;
sc->tx_page_start = memsize / ED_PAGE_SIZE;
/*
* Use one xmit buffer if < 16k, two buffers otherwise (if not told
* otherwise).
*/
if ((memsize < 16384) || (isa_dev->id_flags & ED_FLAGS_NO_MULTI_BUFFERING))
sc->txb_cnt = 1;
else
sc->txb_cnt = 2;
sc->rec_page_start = sc->tx_page_start + sc->txb_cnt * ED_TXBUF_SIZE;
sc->rec_page_stop = sc->tx_page_start + memsize / ED_PAGE_SIZE;
sc->mem_ring = sc->mem_start + sc->txb_cnt * ED_PAGE_SIZE * ED_TXBUF_SIZE;
ed_pio_readmem(sc, 0, romdata, 16);
for (n = 0; n < ETHER_ADDR_LEN; n++)
sc->arpcom.ac_enaddr[n] = romdata[n*(sc->isa16bit+1)];
/* clear any pending interrupts that might have occurred above */
outb(sc->nic_addr + ED_P0_ISR, 0xff);
return(ED_NOVELL_IO_PORTS);
}
/*
* Install interface into kernel networking data structures
*/
int
ed_attach(isa_dev)
struct isa_device *isa_dev;
{
struct ed_softc *sc = &ed_softc[isa_dev->id_unit];
struct ifnet *ifp = &sc->arpcom.ac_if;
struct ifaddr *ifa;
struct sockaddr_dl *sdl;
/*
* Set interface to stopped condition (reset)
*/
ed_stop(isa_dev->id_unit);
/*
* Initialize ifnet structure
*/
ifp->if_unit = isa_dev->id_unit;
ifp->if_name = "ed" ;
ifp->if_mtu = ETHERMTU;
ifp->if_init = ed_init;
ifp->if_output = ether_output;
ifp->if_start = ed_start;
ifp->if_ioctl = ed_ioctl;
ifp->if_reset = ed_reset;
ifp->if_watchdog = ed_watchdog;
/*
* Set default state for ALTPHYS flag (used to disable the tranceiver
* for AUI operation), based on compile-time config option.
*/
if (isa_dev->id_flags & ED_FLAGS_DISABLE_TRANCEIVER)
ifp->if_flags =
(IFF_BROADCAST | IFF_SIMPLEX | IFF_NOTRAILERS | IFF_ALTPHYS);
else
ifp->if_flags = (IFF_BROADCAST | IFF_SIMPLEX | IFF_NOTRAILERS);
/*
* 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;
bcopy(sc->arpcom.ac_enaddr, LLADDR(sdl), ETHER_ADDR_LEN);
}
/*
* Print additional info when attached
*/
printf("ed%d: address %s, ", isa_dev->id_unit,
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("%s ",sc->isa16bit ? "(16 bit)" : "(8 bit)");
printf("%s\n", ((sc->vendor == ED_VENDOR_3COM) &&
(ifp->if_flags & IFF_ALTPHYS)) ? "tranceiver disabled" : "");
/*
* 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
return 1;
}
/*
* Reset interface.
*/
void
ed_reset(unit, uban)
int unit;
int uban; /* XXX */
{
int s;
s = splimp();
/*
* Stop interface and re-initialize.
*/
ed_stop(unit);
ed_init(unit);
(void) splx(s);
}
/*
* Take interface offline.
*/
void
ed_stop(unit)
int unit;
{
struct ed_softc *sc = &ed_softc[unit];
int n = 5000;
/*
* Stop everything on the interface, and select page 0 registers.
*/
if (sc->is790) {
outb(sc->nic_addr + ED_P0_CR, ED_CR_STP);
} else {
outb(sc->nic_addr + ED_P0_CR, ED_CR_RD2|ED_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 (((inb(sc->nic_addr + ED_P0_ISR) & ED_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.
*/
void
ed_watchdog(unit)
int unit;
{
struct ed_softc *sc = &ed_softc[unit];
log(LOG_ERR, "ed%d: device timeout\n", unit);
++sc->arpcom.ac_if.if_oerrors;
ed_reset(unit, 0);
}
/*
* Initialize device.
*/
void
ed_init(unit)
int unit;
{
struct ed_softc *sc = &ed_softc[unit];
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 = splimp();
/* reset transmitter flags */
sc->xmit_busy = 0;
sc->arpcom.ac_if.if_timer = 0;
sc->txb_inuse = 0;
sc->txb_new = 0;
sc->txb_next_tx = 0;
/* This variable is used below - don't move this assignment */
sc->next_packet = sc->rec_page_start + 1;
/*
* Set interface for page 0, Remote DMA complete, Stopped
*/
if (sc->is790) {
outb(sc->nic_addr + ED_P0_CR, ED_CR_STP);
} else {
outb(sc->nic_addr + ED_P0_CR, ED_CR_RD2|ED_CR_STP);
}
if (sc->isa16bit) {
/*
* Set FIFO threshold to 8, No auto-init Remote DMA,
* byte order=80x86, word-wide DMA xfers,
*/
outb(sc->nic_addr + ED_P0_DCR, ED_DCR_FT1|ED_DCR_WTS|ED_DCR_LS);
} else {
/*
* Same as above, but byte-wide DMA xfers
*/
outb(sc->nic_addr + ED_P0_DCR, ED_DCR_FT1|ED_DCR_LS);
}
/*
* Clear Remote Byte Count Registers
*/
outb(sc->nic_addr + ED_P0_RBCR0, 0);
outb(sc->nic_addr + ED_P0_RBCR1, 0);
/*
* Enable reception of broadcast packets
*/
outb(sc->nic_addr + ED_P0_RCR, ED_RCR_AB);
/*
* Place NIC in internal loopback mode
*/
outb(sc->nic_addr + ED_P0_TCR, ED_TCR_LB0);
/*
* Initialize transmit/receive (ring-buffer) Page Start
*/
outb(sc->nic_addr + ED_P0_TPSR, sc->tx_page_start);
outb(sc->nic_addr + ED_P0_PSTART, sc->rec_page_start);
/* Set lower bits of byte addressable framing to 0 */
if (sc->is790)
outb(sc->nic_addr + 0x09, 0);
/*
* Initialize Receiver (ring-buffer) Page Stop and Boundry
*/
outb(sc->nic_addr + ED_P0_PSTOP, sc->rec_page_stop);
outb(sc->nic_addr + ED_P0_BNRY, sc->rec_page_start);
/*
* Clear all interrupts. A '1' in each bit position clears the
* corresponding flag.
*/
outb(sc->nic_addr + ED_P0_ISR, 0xff);
/*
* Enable the following interrupts: receive/transmit complete,
* receive/transmit error, and Receiver OverWrite.
*
* Counter overflow and Remote DMA complete are *not* enabled.
*/
outb(sc->nic_addr + ED_P0_IMR,
ED_IMR_PRXE|ED_IMR_PTXE|ED_IMR_RXEE|ED_IMR_TXEE|ED_IMR_OVWE);
/*
* Program Command Register for page 1
*/
if (sc->is790) {
outb(sc->nic_addr + ED_P0_CR, ED_CR_PAGE_1|ED_CR_STP);
} else {
outb(sc->nic_addr + ED_P0_CR, ED_CR_PAGE_1|ED_CR_RD2|ED_CR_STP);
}
/*
* Copy out our station address
*/
for (i = 0; i < ETHER_ADDR_LEN; ++i)
outb(sc->nic_addr + ED_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)
outb(sc->nic_addr + ED_P1_MAR0 + i, 0xff);
#endif
/*
* Set Current Page pointer to next_packet (initialized above)
*/
outb(sc->nic_addr + ED_P1_CURR, sc->next_packet);
/*
* Set Command Register for page 0, Remote DMA complete,
* and interface Start.
*/
if (sc->is790) {
outb(sc->nic_addr + ED_P1_CR, ED_CR_STA);
} else {
outb(sc->nic_addr + ED_P1_CR, ED_CR_RD2|ED_CR_STA);
}
/*
* Take interface out of loopback
*/
outb(sc->nic_addr + ED_P0_TCR, 0);
/*
* If this is a 3Com board, the tranceiver must be software enabled
* (there is no settable hardware default).
*/
if (sc->vendor == ED_VENDOR_3COM) {
if (ifp->if_flags & IFF_ALTPHYS) {
outb(sc->asic_addr + ED_3COM_CR, 0);
} else {
outb(sc->asic_addr + ED_3COM_CR, ED_3COM_CR_XSEL);
}
}
/*
* Set 'running' flag, and clear output active flag.
*/
ifp->if_flags |= IFF_RUNNING;
ifp->if_flags &= ~IFF_OACTIVE;
/*
* ...and attempt to start output
*/
ed_start(ifp);
(void) splx(s);
}
/*
* This routine actually starts the transmission on the interface
*/
static inline void ed_xmit(ifp)
struct ifnet *ifp;
{
struct ed_softc *sc = &ed_softc[ifp->if_unit];
unsigned short len;
len = sc->txb_len[sc->txb_next_tx];
/*
* Set NIC for page 0 register access
*/
if (sc->is790) {
outb(sc->nic_addr + ED_P0_CR, ED_CR_STA);
} else {
outb(sc->nic_addr + ED_P0_CR, ED_CR_RD2|ED_CR_STA);
}
/*
* Set TX buffer start page
*/
outb(sc->nic_addr + ED_P0_TPSR, sc->tx_page_start +
sc->txb_next_tx * ED_TXBUF_SIZE);
/*
* Set TX length
*/
outb(sc->nic_addr + ED_P0_TBCR0, len);
outb(sc->nic_addr + ED_P0_TBCR1, len >> 8);
/*
* Set page 0, Remote DMA complete, Transmit Packet, and *Start*
*/
if (sc->is790) {
outb(sc->nic_addr + ED_P0_CR, ED_CR_TXP | ED_CR_STA);
} else {
outb(sc->nic_addr + ED_P0_CR, ED_CR_RD2|ED_CR_TXP|ED_CR_STA);
}
sc->xmit_busy = 1;
/*
* Point to next transmit buffer slot and wrap if necessary.
*/
sc->txb_next_tx++;
if (sc->txb_next_tx == sc->txb_cnt)
sc->txb_next_tx = 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 splimp _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)
*/
void
ed_start(ifp)
struct ifnet *ifp;
{
struct ed_softc *sc = &ed_softc[ifp->if_unit];
struct mbuf *m0, *m;
caddr_t buffer;
int len;
outloop:
/*
* First, see if there are buffered packets and an idle
* transmitter - should never happen at this point.
*/
if (sc->txb_inuse && (sc->xmit_busy == 0)) {
printf("ed: packets buffers, but transmitter idle\n");
ed_xmit(ifp);
}
/*
* See if there is room to put another packet in the buffer.
*/
if (sc->txb_inuse == sc->txb_cnt) {
/*
* No room. Indicate this to the outside world
* and exit.
*/
ifp->if_flags |= IFF_OACTIVE;
return;
}
IF_DEQUEUE(&sc->arpcom.ac_if.if_snd, m);
if (m == 0) {
/*
* 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 all
* the buffers with data then we still want to accept more.
*/
ifp->if_flags &= ~IFF_OACTIVE;
return;
}
/*
* Copy the mbuf chain into the transmit buffer
*/
m0 = m;
/* txb_new points to next open buffer slot */
buffer = sc->mem_start + (sc->txb_new * ED_TXBUF_SIZE * ED_PAGE_SIZE);
if (sc->mem_shared) {
/*
* Special case setup for 16 bit boards...
*/
if (sc->isa16bit) {
switch (sc->vendor) {
/*
* For 16bit 3Com boards (which have 16k of memory),
* we have the xmit buffers in a different page
* of memory ('page 0') - so change pages.
*/
case ED_VENDOR_3COM:
outb(sc->asic_addr + ED_3COM_GACFR,
ED_3COM_GACFR_RSEL);
break;
/*
* Enable 16bit access to shared memory on WD/SMC boards
* Don't update wd_laar_proto because we want to restore the
* previous state (because an arp reply in the input code
* may cause a call-back to ed_start)
* XXX - the call-back to 'start' is a bug, IMHO.
*/
case ED_VENDOR_WD_SMC:
outb(sc->asic_addr + ED_WD_LAAR,
(sc->wd_laar_proto | ED_WD_LAAR_M16EN));
}
}
for (len = 0; m != 0; m = m->m_next) {
bcopy(mtod(m, caddr_t), buffer, m->m_len);
buffer += m->m_len;
len += m->m_len;
}
/*
* Restore previous shared memory access
*/
if (sc->isa16bit) {
switch (sc->vendor) {
case ED_VENDOR_3COM:
outb(sc->asic_addr + ED_3COM_GACFR,
ED_3COM_GACFR_RSEL | ED_3COM_GACFR_MBS0);
break;
case ED_VENDOR_WD_SMC:
outb(sc->asic_addr + ED_WD_LAAR, sc->wd_laar_proto);
break;
}
}
} else {
len = ed_pio_write_mbufs(sc, m, buffer);
}
sc->txb_len[sc->txb_new] = MAX(len, ETHER_MIN_LEN);
sc->txb_inuse++;
/*
* Point to next buffer slot and wrap if necessary.
*/
sc->txb_new++;
if (sc->txb_new == sc->txb_cnt)
sc->txb_new = 0;
if (sc->xmit_busy == 0)
ed_xmit(ifp);
/*
* If there is BPF support in the configuration, tap off here.
* The following has support for converting trailer packets
* back to normal.
* XXX - support for trailer packets in BPF should be moved into
* the bpf code proper to avoid code duplication in all of
* the drivers.
*/
#if NBPFILTER > 0
if (sc->bpf) {
u_short etype;
int off, datasize, resid;
struct ether_header *eh;
struct trailer_header 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),
(caddr_t)&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);
/*
* Loop back to the top to possibly buffer more packets
*/
goto outloop;
}
/*
* Ethernet interface receiver interrupt.
*/
static inline void
ed_rint(unit)
int unit;
{
register struct ed_softc *sc = &ed_softc[unit];
u_char boundry, current;
u_short len;
struct ed_ring packet_hdr;
char *packet_ptr;
/*
* Set NIC to page 1 registers to get 'current' pointer
*/
if (sc->is790) {
outb(sc->nic_addr + ED_P0_CR, ED_CR_PAGE_1|ED_CR_STA);
} else {
outb(sc->nic_addr + ED_P0_CR, ED_CR_PAGE_1|ED_CR_RD2|ED_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 != inb(sc->nic_addr + ED_P1_CURR)) {
/* get pointer to this buffer's header structure */
packet_ptr = sc->mem_ring +
(sc->next_packet - sc->rec_page_start) * ED_PAGE_SIZE;
/*
* The byte count includes the FCS - Frame Check Sequence (a
* 32 bit CRC).
*/
if (sc->mem_shared)
packet_hdr = *(struct ed_ring *)packet_ptr;
else
ed_pio_readmem(sc, packet_ptr, (char *) &packet_hdr,
sizeof(packet_hdr));
len = packet_hdr.count;
if ((len >= ETHER_MIN_LEN) && (len <= ETHER_MAX_LEN)) {
/*
* Go get packet. len - 4 removes CRC from length.
*/
ed_get_packet(sc, packet_ptr + 4, 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,
"ed%d: NIC memory corrupt - invalid packet length %d\n",
unit, len);
++sc->arpcom.ac_if.if_ierrors;
ed_reset(unit, 0);
return;
}
/*
* Update next packet pointer
*/
sc->next_packet = packet_hdr.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
*/
if (sc->is790) {
outb(sc->nic_addr + ED_P0_CR, ED_CR_STA);
} else {
outb(sc->nic_addr + ED_P0_CR, ED_CR_RD2|ED_CR_STA);
}
outb(sc->nic_addr + ED_P0_BNRY, boundry);
/*
* Set NIC to page 1 registers before looping to top (prepare to
* get 'CURR' current pointer)
*/
if (sc->is790) {
outb(sc->nic_addr + ED_P0_CR, ED_CR_PAGE_1|ED_CR_STA);
} else {
outb(sc->nic_addr + ED_P0_CR, ED_CR_PAGE_1|ED_CR_RD2|ED_CR_STA);
}
}
}
/*
* Ethernet interface interrupt processor
*/
void
edintr(unit)
int unit;
{
struct ed_softc *sc = &ed_softc[unit];
u_char isr;
/*
* Set NIC to page 0 registers
*/
if (sc->is790) {
outb(sc->nic_addr + ED_P0_CR, ED_CR_STA);
} else {
outb(sc->nic_addr + ED_P0_CR, ED_CR_RD2|ED_CR_STA);
}
/*
* loop until there are no more new interrupts
*/
while (isr = inb(sc->nic_addr + ED_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)
*/
outb(sc->nic_addr + ED_P0_ISR, isr);
/*
* Handle transmitter interrupts. Handle these first
* because the receiver will reset the board under
* some conditions.
*/
if (isr & (ED_ISR_PTX|ED_ISR_TXE)) {
u_char collisions = inb(sc->nic_addr + ED_P0_NCR) & 0x0f;
/*
* 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.
*/
(void) inb(sc->nic_addr + ED_P0_TSR);
if (isr & ED_ISR_TXE) {
/*
* Excessive collisions (16)
*/
if ((inb(sc->nic_addr + ED_P0_TSR) & ED_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;
/*
* Decrement buffer in-use count if not zero (can only
* be zero if a transmitter interrupt occured while
* not actually transmitting).
* If data is ready to transmit, start it transmitting,
* otherwise defer until after handling receiver
*/
if (sc->txb_inuse && --sc->txb_inuse)
ed_xmit(&sc->arpcom.ac_if);
}
/*
* Handle receiver interrupts
*/
if (isr & (ED_ISR_PRX|ED_ISR_RXE|ED_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 & ED_ISR_OVW) {
++sc->arpcom.ac_if.if_ierrors;
#ifdef DIAGNOSTIC
log(LOG_WARNING,
"ed%d: warning - receiver ring buffer overrun\n",
unit);
#endif
/*
* Stop/reset/re-init NIC
*/
ed_reset(unit, 0);
} else {
/*
* Receiver Error. One or more of: CRC error, frame
* alignment error FIFO overrun, or missed packet.
*/
if (isr & ED_ISR_RXE) {
++sc->arpcom.ac_if.if_ierrors;
#ifdef ED_DEBUG
printf("ed%d: receive error %x\n", unit,
inb(sc->nic_addr + ED_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).
*/
/*
* Enable 16bit access to shared memory first
* on WD/SMC boards.
*/
if (sc->isa16bit &&
(sc->vendor == ED_VENDOR_WD_SMC)) {
outb(sc->asic_addr + ED_WD_LAAR,
(sc->wd_laar_proto |=
ED_WD_LAAR_M16EN));
}
ed_rint (unit);
/* disable 16bit access */
if (sc->isa16bit &&
(sc->vendor == ED_VENDOR_WD_SMC)) {
outb(sc->asic_addr + ED_WD_LAAR,
(sc->wd_laar_proto &=
~ED_WD_LAAR_M16EN));
}
}
}
/*
* 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)
ed_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)
*/
if (sc->is790) {
outb(sc->nic_addr + ED_P0_CR, ED_CR_STA);
} else {
outb(sc->nic_addr + ED_P0_CR, ED_CR_RD2|ED_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 & ED_ISR_CNT) {
(void) inb(sc->nic_addr + ED_P0_CNTR0);
(void) inb(sc->nic_addr + ED_P0_CNTR1);
(void) inb(sc->nic_addr + ED_P0_CNTR2);
}
}
}
/*
* Process an ioctl request. This code needs some work - it looks
* pretty ugly.
*/
int
ed_ioctl(ifp, command, data)
register struct ifnet *ifp;
int command;
caddr_t data;
{
register struct ifaddr *ifa = (struct ifaddr *)data;
struct ed_softc *sc = &ed_softc[ifp->if_unit];
struct ifreq *ifr = (struct ifreq *)data;
int s, error = 0;
s = splimp();
switch (command) {
case SIOCSIFADDR:
ifp->if_flags |= IFF_UP;
switch (ifa->ifa_addr->sa_family) {
#ifdef INET
case AF_INET:
ed_init(ifp->if_unit); /* 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 {
/*
*
*/
bcopy((caddr_t)ina->x_host.c_host,
(caddr_t)sc->arpcom.ac_enaddr,
sizeof(sc->arpcom.ac_enaddr));
}
/*
* Set new address
*/
ed_init(ifp->if_unit);
break;
}
#endif
default:
ed_init(ifp->if_unit);
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)) {
ed_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))
ed_init(ifp->if_unit);
}
#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 ed_init().
*/
outb(sc->nic_addr + ED_P0_RCR,
ED_RCR_PRO|ED_RCR_AM|ED_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).
*/
outb(sc->nic_addr + ED_P0_RCR, ED_RCR_AB);
}
#endif
/*
* An unfortunate hack to provide the (required) software control
* of the tranceiver for 3Com boards. The ALTPHYS flag disables
* the tranceiver if set.
*/
if (sc->vendor == ED_VENDOR_3COM) {
if (ifp->if_flags & IFF_ALTPHYS) {
outb(sc->asic_addr + ED_3COM_CR, 0);
} else {
outb(sc->asic_addr + ED_3COM_CR, ED_3COM_CR_XSEL);
}
}
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)->mem_end) ? \
(((caddr_t)(start)+(off))) - (sc)->mem_end \
+ (sc)->mem_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.
*/
static void
ed_get_packet(sc, buf, len)
struct ed_softc *sc;
char *buf;
u_short len;
{
struct ether_header *eh;
struct mbuf *m, *head = 0, *ed_ring_to_mbuf();
u_short off;
int resid;
u_short etype;
struct trailer_header 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;
/* 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;
eh = mtod(head, struct ether_header *);
if (sc->mem_shared)
bcopy(buf, mtod(head, caddr_t), sizeof(struct ether_header));
else
ed_pio_readmem(sc, 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 */
/*
* If we have shared memory, we can get info directly from the
* stored packet, otherwise we must get a local copy
* of the trailer header using PIO.
*/
if (sc->mem_shared) {
eh->ether_type = *ringoffset(sc, buf, off, u_short *);
resid = ntohs(*ringoffset(sc, buf, off+2, u_short *));
} else {
struct trailer_header trailer_header;
ed_pio_readmem(sc,
ringoffset(sc, buf, off, caddr_t),
(char *) &trailer_header,
sizeof(trailer_header));
eh->ether_type = trailer_header.ether_type;
resid = trailer_header.ether_residual;
}
if ((off + resid) > len) goto bad; /* insanity */
resid -= sizeof(struct trailer_header);
if (resid < 0) goto bad; /* insanity */
m = ed_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 = ed_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));
/*
* silly ether_input routine needs 'type' in host byte order
*/
eh->ether_type = ntohs(eh->ether_type);
ether_input(&sc->arpcom.ac_if, eh, head);
return;
bad: if (head)
m_freem(head);
return;
}
/*
* Supporting routines
*/
/*
* Given a NIC memory source address and a host memory destination
* address, copy 'amount' from NIC to host using Programmed I/O.
* The 'amount' is rounded up to a word - okay as long as mbufs
* are word sized.
* This routine is currently Novell-specific.
*/
void
ed_pio_readmem(sc,src,dst,amount)
struct ed_softc *sc;
unsigned short src;
unsigned char *dst;
unsigned short amount;
{
unsigned short tmp_amount;
/* select page 0 registers */
outb(sc->nic_addr + ED_P0_CR, ED_CR_RD2|ED_CR_STA);
/* round up to a word */
tmp_amount = amount;
if (amount & 1) ++amount;
/* set up DMA byte count */
outb(sc->nic_addr + ED_P0_RBCR0, amount);
outb(sc->nic_addr + ED_P0_RBCR1, amount>>8);
/* set up source address in NIC mem */
outb(sc->nic_addr + ED_P0_RSAR0, src);
outb(sc->nic_addr + ED_P0_RSAR1, src>>8);
outb(sc->nic_addr + ED_P0_CR, ED_CR_RD0 | ED_CR_STA);
if (sc->isa16bit) {
insw(sc->asic_addr + ED_NOVELL_DATA, dst, amount/2);
} else
insb(sc->asic_addr + ED_NOVELL_DATA, dst, amount);
}
/*
* Stripped down routine for writing a linear buffer to NIC memory.
* Only used in the probe routine to test the memory. 'len' must
* be even.
*/
void
ed_pio_writemem(sc,src,dst,len)
struct ed_softc *sc;
char *src;
unsigned short dst;
unsigned short len;
{
int maxwait=100; /* about 120us */
/* select page 0 registers */
outb(sc->nic_addr + ED_P0_CR, ED_CR_RD2|ED_CR_STA);
/* reset remote DMA complete flag */
outb(sc->nic_addr + ED_P0_ISR, ED_ISR_RDC);
/* set up DMA byte count */
outb(sc->nic_addr + ED_P0_RBCR0, len);
outb(sc->nic_addr + ED_P0_RBCR1, len>>8);
/* set up destination address in NIC mem */
outb(sc->nic_addr + ED_P0_RSAR0, dst);
outb(sc->nic_addr + ED_P0_RSAR1, dst>>8);
/* set remote DMA write */
outb(sc->nic_addr + ED_P0_CR, ED_CR_RD1 | ED_CR_STA);
if (sc->isa16bit)
outsw(sc->asic_addr + ED_NOVELL_DATA, src, len/2);
else
outsb(sc->asic_addr + ED_NOVELL_DATA, src, len);
/*
* Wait for remote DMA complete. This is necessary because on the
* transmit side, data is handled internally by the NIC in bursts
* and we can't start another remote DMA until this one completes.
* Not waiting causes really bad things to happen - like the NIC
* irrecoverably jamming the ISA bus.
*/
while (((inb(sc->nic_addr + ED_P0_ISR) & ED_ISR_RDC) != ED_ISR_RDC) && --maxwait);
}
/*
* Write an mbuf chain to the destination NIC memory address using
* programmed I/O.
*/
u_short
ed_pio_write_mbufs(sc,m,dst)
struct ed_softc *sc;
struct mbuf *m;
unsigned short dst;
{
unsigned short len, mb_offset;
struct mbuf *mp;
unsigned char residual[2];
int maxwait=100; /* about 120us */
/* First, count up the total number of bytes to copy */
for (len = 0, mp = m; mp; mp = mp->m_next)
len += mp->m_len;
/* select page 0 registers */
outb(sc->nic_addr + ED_P0_CR, ED_CR_RD2|ED_CR_STA);
/* reset remote DMA complete flag */
outb(sc->nic_addr + ED_P0_ISR, ED_ISR_RDC);
/* set up DMA byte count */
outb(sc->nic_addr + ED_P0_RBCR0, len);
outb(sc->nic_addr + ED_P0_RBCR1, len>>8);
/* set up destination address in NIC mem */
outb(sc->nic_addr + ED_P0_RSAR0, dst);
outb(sc->nic_addr + ED_P0_RSAR1, dst>>8);
/* set remote DMA write */
outb(sc->nic_addr + ED_P0_CR, ED_CR_RD1 | ED_CR_STA);
mb_offset = 0;
/*
* Transfer the mbuf chain to the NIC memory.
* The following code isn't too pretty. The problem is that we can only
* transfer words to the board, and if an mbuf has an odd number
* of bytes in it, this is a problem. It's not a simple matter of
* just removing a byte from the next mbuf (adjusting data++ and
* len--) because this will hose-over the mbuf chain which might
* be needed later for BPF. Instead, we maintain an offset
* (mb_offset) which let's us skip over the first byte in the
* following mbuf.
*/
while (m) {
if (m->m_len - mb_offset) {
if (sc->isa16bit) {
if ((m->m_len - mb_offset) > 1)
outsw(sc->asic_addr + ED_NOVELL_DATA,
mtod(m, caddr_t) + mb_offset,
(m->m_len - mb_offset) / 2);
/*
* if odd number of bytes, get the odd byte from
* the next mbuf with data
*/
if ((m->m_len - mb_offset) & 1) {
/* first the last byte in current mbuf */
residual[0] = *(mtod(m, caddr_t) +
m->m_len - 1);
/* advance past any empty mbufs */
while (m->m_next && (m->m_next->m_len == 0))
m = m->m_next;
if (m->m_next) {
/* remove first byte in next mbuf */
residual[1] = *(mtod(m->m_next, caddr_t));
mb_offset = 1;
}
outw(sc->asic_addr + ED_NOVELL_DATA,
*((unsigned short *) residual));
} else
mb_offset = 0;
} else
outsb(sc->asic_addr + ED_NOVELL_DATA, m->m_data, m->m_len);
}
m = m->m_next;
}
/*
* Wait for remote DMA complete. This is necessary because on the
* transmit side, data is handled internally by the NIC in bursts
* and we can't start another remote DMA until this one completes.
* Not waiting causes really bad things to happen - like the NIC
* irrecoverably jamming the ISA bus.
*/
while (((inb(sc->nic_addr + ED_P0_ISR) & ED_ISR_RDC) != ED_ISR_RDC) && --maxwait);
if (!maxwait) {
log(LOG_WARNING, "ed%d: remote transmit DMA failed to complete\n",
sc->arpcom.ac_if.if_unit);
ed_reset(sc->arpcom.ac_if.if_unit, 0);
}
return(len);
}
/*
* 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 *
ed_ring_copy(sc,src,dst,amount)
struct ed_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->mem_end) {
tmp_amount = sc->mem_end - src;
/* copy amount up to end of NIC memory */
if (sc->mem_shared)
bcopy(src,dst,tmp_amount);
else
ed_pio_readmem(sc,src,dst,tmp_amount);
amount -= tmp_amount;
src = sc->mem_ring;
dst += tmp_amount;
}
if (sc->mem_shared)
bcopy(src, dst, amount);
else
ed_pio_readmem(sc, 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 *
ed_ring_to_mbuf(sc,src,dst,total_len)
struct ed_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 = ed_ring_copy(sc, src, mtod(m, caddr_t) + m->m_len, amount);
m->m_len += amount;
total_len -= amount;
}
return (m);
}
#endif
Continuous source code history from original PDP-7 UNIX to FreeBSD 2, the first fully unencumbered FreeBSD release.