FreeBSD-5.3/sys/dev/sbni/if_sbni.c
/*
* Copyright (c) 1997-2001 Granch, Ltd. All rights reserved.
* Author: Denis I.Timofeev <timofeev@granch.ru>
*
* Redistributon and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice unmodified, this list of conditions, and the following
* disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/sys/dev/sbni/if_sbni.c,v 1.18 2004/08/13 23:41:00 rwatson Exp $");
/*
* Device driver for Granch SBNI12 leased line adapters
*
* Revision 2.0.0 1997/08/06
* Initial revision by Alexey Zverev
*
* Revision 2.0.1 1997/08/11
* Additional internal statistics support (tx statistics)
*
* Revision 2.0.2 1997/11/05
* if_bpf bug has been fixed
*
* Revision 2.0.3 1998/12/20
* Memory leakage has been eliminated in
* the sbni_st and sbni_timeout routines.
*
* Revision 3.0 2000/08/10 by Yaroslav Polyakov
* Support for PCI cards. 4.1 modification.
*
* Revision 3.1 2000/09/12
* Removed extra #defines around bpf functions
*
* Revision 4.0 2000/11/23 by Denis Timofeev
* Completely redesigned the buffer management
*
* Revision 4.1 2001/01/21
* Support for PCI Dual cards and new SBNI12D-10, -11 Dual/ISA cards
*
* Written with reference to NE2000 driver developed by David Greenman.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/mbuf.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/callout.h>
#include <sys/syslog.h>
#include <sys/random.h>
#include <machine/bus.h>
#include <sys/rman.h>
#include <machine/resource.h>
#include <net/if.h>
#include <net/ethernet.h>
#include <net/if_arp.h>
#include <net/bpf.h>
#include <dev/sbni/if_sbnireg.h>
#include <dev/sbni/if_sbnivar.h>
#define ASM_CRC 1
static void sbni_init(void *);
static void sbni_start(struct ifnet *);
static int sbni_ioctl(struct ifnet *, u_long, caddr_t);
static void sbni_watchdog(struct ifnet *);
static void sbni_stop(struct sbni_softc *);
static void handle_channel(struct sbni_softc *);
static void card_start(struct sbni_softc *);
static int recv_frame(struct sbni_softc *);
static void send_frame(struct sbni_softc *);
static int upload_data(struct sbni_softc *, u_int, u_int, u_int, u_int32_t);
static int skip_tail(struct sbni_softc *, u_int, u_int32_t);
static void interpret_ack(struct sbni_softc *, u_int);
static void download_data(struct sbni_softc *, u_int32_t *);
static void prepare_to_send(struct sbni_softc *);
static void drop_xmit_queue(struct sbni_softc *);
static int get_rx_buf(struct sbni_softc *);
static void indicate_pkt(struct sbni_softc *);
static void change_level(struct sbni_softc *);
static int check_fhdr(struct sbni_softc *, u_int *, u_int *,
u_int *, u_int *, u_int32_t *);
static int append_frame_to_pkt(struct sbni_softc *, u_int, u_int32_t);
static void timeout_change_level(struct sbni_softc *);
static void send_frame_header(struct sbni_softc *, u_int32_t *);
static void set_initial_values(struct sbni_softc *, struct sbni_flags);
static u_int32_t calc_crc32(u_int32_t, caddr_t, u_int);
static timeout_t sbni_timeout;
static __inline u_char sbni_inb(struct sbni_softc *, enum sbni_reg);
static __inline void sbni_outb(struct sbni_softc *, enum sbni_reg, u_char);
static __inline void sbni_insb(struct sbni_softc *, u_char *, u_int);
static __inline void sbni_outsb(struct sbni_softc *, u_char *, u_int);
static u_int32_t crc32tab[];
#ifdef SBNI_DUAL_COMPOUND
struct sbni_softc *sbni_headlist;
#endif
u_int32_t next_sbni_unit;
/* -------------------------------------------------------------------------- */
static __inline u_char
sbni_inb(struct sbni_softc *sc, enum sbni_reg reg)
{
return bus_space_read_1(
rman_get_bustag(sc->io_res),
rman_get_bushandle(sc->io_res),
sc->io_off + reg);
}
static __inline void
sbni_outb(struct sbni_softc *sc, enum sbni_reg reg, u_char value)
{
bus_space_write_1(
rman_get_bustag(sc->io_res),
rman_get_bushandle(sc->io_res),
sc->io_off + reg, value);
}
static __inline void
sbni_insb(struct sbni_softc *sc, u_char *to, u_int len)
{
bus_space_read_multi_1(
rman_get_bustag(sc->io_res),
rman_get_bushandle(sc->io_res),
sc->io_off + DAT, to, len);
}
static __inline void
sbni_outsb(struct sbni_softc *sc, u_char *from, u_int len)
{
bus_space_write_multi_1(
rman_get_bustag(sc->io_res),
rman_get_bushandle(sc->io_res),
sc->io_off + DAT, from, len);
}
/*
Valid combinations in CSR0 (for probing):
VALID_DECODER 0000,0011,1011,1010
; 0 ; -
TR_REQ ; 1 ; +
TR_RDY ; 2 ; -
TR_RDY TR_REQ ; 3 ; +
BU_EMP ; 4 ; +
BU_EMP TR_REQ ; 5 ; +
BU_EMP TR_RDY ; 6 ; -
BU_EMP TR_RDY TR_REQ ; 7 ; +
RC_RDY ; 8 ; +
RC_RDY TR_REQ ; 9 ; +
RC_RDY TR_RDY ; 10 ; -
RC_RDY TR_RDY TR_REQ ; 11 ; -
RC_RDY BU_EMP ; 12 ; -
RC_RDY BU_EMP TR_REQ ; 13 ; -
RC_RDY BU_EMP TR_RDY ; 14 ; -
RC_RDY BU_EMP TR_RDY TR_REQ ; 15 ; -
*/
#define VALID_DECODER (2 + 8 + 0x10 + 0x20 + 0x80 + 0x100 + 0x200)
int
sbni_probe(struct sbni_softc *sc)
{
u_char csr0;
csr0 = sbni_inb(sc, CSR0);
if (csr0 != 0xff && csr0 != 0x00) {
csr0 &= ~EN_INT;
if (csr0 & BU_EMP)
csr0 |= EN_INT;
if (VALID_DECODER & (1 << (csr0 >> 4)))
return (0);
}
return (ENXIO);
}
/*
* Install interface into kernel networking data structures
*/
void
sbni_attach(struct sbni_softc *sc, int unit, struct sbni_flags flags)
{
struct ifnet *ifp;
u_char csr0;
ifp = &sc->arpcom.ac_if;
sbni_outb(sc, CSR0, 0);
set_initial_values(sc, flags);
callout_handle_init(&sc->wch);
/* Initialize ifnet structure */
ifp->if_softc = sc;
if_initname(ifp, "sbni", unit);
ifp->if_init = sbni_init;
ifp->if_start = sbni_start;
ifp->if_ioctl = sbni_ioctl;
ifp->if_watchdog = sbni_watchdog;
ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
/* report real baud rate */
csr0 = sbni_inb(sc, CSR0);
ifp->if_baudrate =
(csr0 & 0x01 ? 500000 : 2000000) / (1 << flags.rate);
ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST |
IFF_NEEDSGIANT;
ether_ifattach(ifp, sc->arpcom.ac_enaddr);
/* device attach does transition from UNCONFIGURED to IDLE state */
if_printf(ifp, "speed %ld, rxl ", ifp->if_baudrate);
if (sc->delta_rxl)
printf("auto\n");
else
printf("%d (fixed)\n", sc->cur_rxl_index);
}
/* -------------------------------------------------------------------------- */
static void
sbni_init(void *xsc)
{
struct sbni_softc *sc;
struct ifnet *ifp;
int s;
sc = (struct sbni_softc *)xsc;
ifp = &sc->arpcom.ac_if;
/*
* kludge to avoid multiple initialization when more than once
* protocols configured
*/
if (ifp->if_flags & IFF_RUNNING)
return;
s = splimp();
ifp->if_timer = 0;
card_start(sc);
sc->wch = timeout(sbni_timeout, sc, hz/SBNI_HZ);
ifp->if_flags |= IFF_RUNNING;
ifp->if_flags &= ~IFF_OACTIVE;
/* attempt to start output */
sbni_start(ifp);
splx(s);
}
static void
sbni_start(struct ifnet *ifp)
{
struct sbni_softc *sc = ifp->if_softc;
if (sc->tx_frameno == 0)
prepare_to_send(sc);
}
static void
sbni_stop(struct sbni_softc *sc)
{
sbni_outb(sc, CSR0, 0);
drop_xmit_queue(sc);
if (sc->rx_buf_p) {
m_freem(sc->rx_buf_p);
sc->rx_buf_p = NULL;
}
untimeout(sbni_timeout, sc, sc->wch);
sc->wch.callout = NULL;
}
/* -------------------------------------------------------------------------- */
/* interrupt handler */
/*
* SBNI12D-10, -11/ISA boards within "common interrupt" mode could not
* be looked as two independent single-channel devices. Every channel seems
* as Ethernet interface but interrupt handler must be common. Really, first
* channel ("master") driver only registers the handler. In it's struct softc
* it has got pointer to "slave" channel's struct softc and handles that's
* interrupts too.
* softc of successfully attached ISA SBNI boards is linked to list.
* While next board driver is initialized, it scans this list. If one
* has found softc with same irq and ioaddr different by 4 then it assumes
* this board to be "master".
*/
void
sbni_intr(void *arg)
{
struct sbni_softc *sc;
int repeat;
sc = (struct sbni_softc *)arg;
do {
repeat = 0;
if (sbni_inb(sc, CSR0) & (RC_RDY | TR_RDY)) {
handle_channel(sc);
repeat = 1;
}
if (sc->slave_sc && /* second channel present */
(sbni_inb(sc->slave_sc, CSR0) & (RC_RDY | TR_RDY))) {
handle_channel(sc->slave_sc);
repeat = 1;
}
} while (repeat);
}
static void
handle_channel(struct sbni_softc *sc)
{
int req_ans;
u_char csr0;
sbni_outb(sc, CSR0, (sbni_inb(sc, CSR0) & ~EN_INT) | TR_REQ);
sc->timer_ticks = CHANGE_LEVEL_START_TICKS;
for (;;) {
csr0 = sbni_inb(sc, CSR0);
if ((csr0 & (RC_RDY | TR_RDY)) == 0)
break;
req_ans = !(sc->state & FL_PREV_OK);
if (csr0 & RC_RDY)
req_ans = recv_frame(sc);
/*
* TR_RDY always equals 1 here because we have owned the marker,
* and we set TR_REQ when disabled interrupts
*/
csr0 = sbni_inb(sc, CSR0);
if ((csr0 & TR_RDY) == 0 || (csr0 & RC_RDY) != 0)
printf("sbni: internal error!\n");
/* if state & FL_NEED_RESEND != 0 then tx_frameno != 0 */
if (req_ans || sc->tx_frameno != 0)
send_frame(sc);
else {
/* send the marker without any data */
sbni_outb(sc, CSR0, sbni_inb(sc, CSR0) & ~TR_REQ);
}
}
sbni_outb(sc, CSR0, sbni_inb(sc, CSR0) | EN_INT);
}
/*
* Routine returns 1 if it need to acknoweledge received frame.
* Empty frame received without errors won't be acknoweledged.
*/
static int
recv_frame(struct sbni_softc *sc)
{
u_int32_t crc;
u_int framelen, frameno, ack;
u_int is_first, frame_ok;
crc = CRC32_INITIAL;
if (check_fhdr(sc, &framelen, &frameno, &ack, &is_first, &crc)) {
frame_ok = framelen > 4 ?
upload_data(sc, framelen, frameno, is_first, crc) :
skip_tail(sc, framelen, crc);
if (frame_ok)
interpret_ack(sc, ack);
} else
frame_ok = 0;
sbni_outb(sc, CSR0, sbni_inb(sc, CSR0) ^ CT_ZER);
if (frame_ok) {
sc->state |= FL_PREV_OK;
if (framelen > 4)
sc->in_stats.all_rx_number++;
} else {
sc->state &= ~FL_PREV_OK;
change_level(sc);
sc->in_stats.all_rx_number++;
sc->in_stats.bad_rx_number++;
}
return (!frame_ok || framelen > 4);
}
static void
send_frame(struct sbni_softc *sc)
{
u_int32_t crc;
u_char csr0;
crc = CRC32_INITIAL;
if (sc->state & FL_NEED_RESEND) {
/* if frame was sended but not ACK'ed - resend it */
if (sc->trans_errors) {
sc->trans_errors--;
if (sc->framelen != 0)
sc->in_stats.resend_tx_number++;
} else {
/* cannot xmit with many attempts */
drop_xmit_queue(sc);
goto do_send;
}
} else
sc->trans_errors = TR_ERROR_COUNT;
send_frame_header(sc, &crc);
sc->state |= FL_NEED_RESEND;
/*
* FL_NEED_RESEND will be cleared after ACK, but if empty
* frame sended then in prepare_to_send next frame
*/
if (sc->framelen) {
download_data(sc, &crc);
sc->in_stats.all_tx_number++;
sc->state |= FL_WAIT_ACK;
}
sbni_outsb(sc, (u_char *)&crc, sizeof crc);
do_send:
csr0 = sbni_inb(sc, CSR0);
sbni_outb(sc, CSR0, csr0 & ~TR_REQ);
if (sc->tx_frameno) {
/* next frame exists - request to send */
sbni_outb(sc, CSR0, csr0 | TR_REQ);
}
}
static void
download_data(struct sbni_softc *sc, u_int32_t *crc_p)
{
struct mbuf *m;
caddr_t data_p;
u_int data_len, pos, slice;
data_p = NULL; /* initialized to avoid warn */
pos = 0;
for (m = sc->tx_buf_p; m != NULL && pos < sc->pktlen; m = m->m_next) {
if (pos + m->m_len > sc->outpos) {
data_len = m->m_len - (sc->outpos - pos);
data_p = mtod(m, caddr_t) + (sc->outpos - pos);
goto do_copy;
} else
pos += m->m_len;
}
data_len = 0;
do_copy:
pos = 0;
do {
if (data_len) {
slice = min(data_len, sc->framelen - pos);
sbni_outsb(sc, data_p, slice);
*crc_p = calc_crc32(*crc_p, data_p, slice);
pos += slice;
if (data_len -= slice)
data_p += slice;
else {
do {
m = m->m_next;
} while (m != NULL && m->m_len == 0);
if (m) {
data_len = m->m_len;
data_p = mtod(m, caddr_t);
}
}
} else {
/* frame too short - zero padding */
pos = sc->framelen - pos;
while (pos--) {
sbni_outb(sc, DAT, 0);
*crc_p = CRC32(0, *crc_p);
}
return;
}
} while (pos < sc->framelen);
}
static int
upload_data(struct sbni_softc *sc, u_int framelen, u_int frameno,
u_int is_first, u_int32_t crc)
{
int frame_ok;
if (is_first) {
sc->wait_frameno = frameno;
sc->inppos = 0;
}
if (sc->wait_frameno == frameno) {
if (sc->inppos + framelen <= ETHER_MAX_LEN) {
frame_ok = append_frame_to_pkt(sc, framelen, crc);
/*
* if CRC is right but framelen incorrect then transmitter
* error was occured... drop entire packet
*/
} else if ((frame_ok = skip_tail(sc, framelen, crc)) != 0) {
sc->wait_frameno = 0;
sc->inppos = 0;
sc->arpcom.ac_if.if_ierrors++;
/* now skip all frames until is_first != 0 */
}
} else
frame_ok = skip_tail(sc, framelen, crc);
if (is_first && !frame_ok) {
/*
* Frame has been violated, but we have stored
* is_first already... Drop entire packet.
*/
sc->wait_frameno = 0;
sc->arpcom.ac_if.if_ierrors++;
}
return (frame_ok);
}
static __inline void send_complete(struct sbni_softc *);
static __inline void
send_complete(struct sbni_softc *sc)
{
m_freem(sc->tx_buf_p);
sc->tx_buf_p = NULL;
sc->arpcom.ac_if.if_opackets++;
}
static void
interpret_ack(struct sbni_softc *sc, u_int ack)
{
if (ack == FRAME_SENT_OK) {
sc->state &= ~FL_NEED_RESEND;
if (sc->state & FL_WAIT_ACK) {
sc->outpos += sc->framelen;
if (--sc->tx_frameno) {
sc->framelen = min(
sc->maxframe, sc->pktlen - sc->outpos);
} else {
send_complete(sc);
prepare_to_send(sc);
}
}
}
sc->state &= ~FL_WAIT_ACK;
}
/*
* Glue received frame with previous fragments of packet.
* Indicate packet when last frame would be accepted.
*/
static int
append_frame_to_pkt(struct sbni_softc *sc, u_int framelen, u_int32_t crc)
{
caddr_t p;
if (sc->inppos + framelen > ETHER_MAX_LEN)
return (0);
if (!sc->rx_buf_p && !get_rx_buf(sc))
return (0);
p = sc->rx_buf_p->m_data + sc->inppos;
sbni_insb(sc, p, framelen);
if (calc_crc32(crc, p, framelen) != CRC32_REMAINDER)
return (0);
sc->inppos += framelen - 4;
if (--sc->wait_frameno == 0) { /* last frame received */
indicate_pkt(sc);
sc->arpcom.ac_if.if_ipackets++;
}
return (1);
}
/*
* Prepare to start output on adapter. Current priority must be set to splimp
* before this routine is called.
* Transmitter will be actually activated when marker has been accepted.
*/
static void
prepare_to_send(struct sbni_softc *sc)
{
struct mbuf *m;
u_int len;
/* sc->tx_buf_p == NULL here! */
if (sc->tx_buf_p)
printf("sbni: memory leak!\n");
sc->outpos = 0;
sc->state &= ~(FL_WAIT_ACK | FL_NEED_RESEND);
for (;;) {
IF_DEQUEUE(&sc->arpcom.ac_if.if_snd, sc->tx_buf_p);
if (!sc->tx_buf_p) {
/* nothing to transmit... */
sc->pktlen = 0;
sc->tx_frameno = 0;
sc->framelen = 0;
sc->arpcom.ac_if.if_flags &= ~IFF_OACTIVE;
return;
}
for (len = 0, m = sc->tx_buf_p; m; m = m->m_next)
len += m->m_len;
if (len != 0)
break;
m_freem(sc->tx_buf_p);
}
if (len < SBNI_MIN_LEN)
len = SBNI_MIN_LEN;
sc->pktlen = len;
sc->tx_frameno = (len + sc->maxframe - 1) / sc->maxframe;
sc->framelen = min(len, sc->maxframe);
sbni_outb(sc, CSR0, sbni_inb(sc, CSR0) | TR_REQ);
sc->arpcom.ac_if.if_flags |= IFF_OACTIVE;
BPF_MTAP(&sc->arpcom.ac_if, sc->tx_buf_p);
}
static void
drop_xmit_queue(struct sbni_softc *sc)
{
struct mbuf *m;
if (sc->tx_buf_p) {
m_freem(sc->tx_buf_p);
sc->tx_buf_p = NULL;
sc->arpcom.ac_if.if_oerrors++;
}
for (;;) {
IF_DEQUEUE(&sc->arpcom.ac_if.if_snd, m);
if (m == NULL)
break;
m_freem(m);
sc->arpcom.ac_if.if_oerrors++;
}
sc->tx_frameno = 0;
sc->framelen = 0;
sc->outpos = 0;
sc->state &= ~(FL_WAIT_ACK | FL_NEED_RESEND);
sc->arpcom.ac_if.if_flags &= ~IFF_OACTIVE;
}
static void
send_frame_header(struct sbni_softc *sc, u_int32_t *crc_p)
{
u_int32_t crc;
u_int len_field;
u_char value;
crc = *crc_p;
len_field = sc->framelen + 6; /* CRC + frameno + reserved */
if (sc->state & FL_NEED_RESEND)
len_field |= FRAME_RETRY; /* non-first attempt... */
if (sc->outpos == 0)
len_field |= FRAME_FIRST;
len_field |= (sc->state & FL_PREV_OK) ? FRAME_SENT_OK : FRAME_SENT_BAD;
sbni_outb(sc, DAT, SBNI_SIG);
value = (u_char)len_field;
sbni_outb(sc, DAT, value);
crc = CRC32(value, crc);
value = (u_char)(len_field >> 8);
sbni_outb(sc, DAT, value);
crc = CRC32(value, crc);
sbni_outb(sc, DAT, sc->tx_frameno);
crc = CRC32(sc->tx_frameno, crc);
sbni_outb(sc, DAT, 0);
crc = CRC32(0, crc);
*crc_p = crc;
}
/*
* if frame tail not needed (incorrect number or received twice),
* it won't store, but CRC will be calculated
*/
static int
skip_tail(struct sbni_softc *sc, u_int tail_len, u_int32_t crc)
{
while (tail_len--)
crc = CRC32(sbni_inb(sc, DAT), crc);
return (crc == CRC32_REMAINDER);
}
static int
check_fhdr(struct sbni_softc *sc, u_int *framelen, u_int *frameno,
u_int *ack, u_int *is_first, u_int32_t *crc_p)
{
u_int32_t crc;
u_char value;
crc = *crc_p;
if (sbni_inb(sc, DAT) != SBNI_SIG)
return (0);
value = sbni_inb(sc, DAT);
*framelen = (u_int)value;
crc = CRC32(value, crc);
value = sbni_inb(sc, DAT);
*framelen |= ((u_int)value) << 8;
crc = CRC32(value, crc);
*ack = *framelen & FRAME_ACK_MASK;
*is_first = (*framelen & FRAME_FIRST) != 0;
if ((*framelen &= FRAME_LEN_MASK) < 6 || *framelen > SBNI_MAX_FRAME - 3)
return (0);
value = sbni_inb(sc, DAT);
*frameno = (u_int)value;
crc = CRC32(value, crc);
crc = CRC32(sbni_inb(sc, DAT), crc); /* reserved byte */
*framelen -= 2;
*crc_p = crc;
return (1);
}
static int
get_rx_buf(struct sbni_softc *sc)
{
struct mbuf *m;
MGETHDR(m, M_DONTWAIT, MT_DATA);
if (m == NULL) {
if_printf(&sc->arpcom.ac_if, "cannot allocate header mbuf\n");
return (0);
}
/*
* We always put the received packet in a single buffer -
* either with just an mbuf header or in a cluster attached
* to the header. The +2 is to compensate for the alignment
* fixup below.
*/
if (ETHER_MAX_LEN + 2 > MHLEN) {
/* Attach an mbuf cluster */
MCLGET(m, M_DONTWAIT);
if ((m->m_flags & M_EXT) == 0) {
m_freem(m);
return (0);
}
}
m->m_pkthdr.len = m->m_len = ETHER_MAX_LEN + 2;
/*
* The +2 is to longword align the start of the real packet.
* (sizeof ether_header == 14)
* This is important for NFS.
*/
m_adj(m, 2);
sc->rx_buf_p = m;
return (1);
}
static void
indicate_pkt(struct sbni_softc *sc)
{
struct ifnet *ifp = &sc->arpcom.ac_if;
struct mbuf *m;
m = sc->rx_buf_p;
m->m_pkthdr.rcvif = ifp;
m->m_pkthdr.len = m->m_len = sc->inppos;
(*ifp->if_input)(ifp, m);
sc->rx_buf_p = NULL;
}
/* -------------------------------------------------------------------------- */
/*
* Routine checks periodically wire activity and regenerates marker if
* connect was inactive for a long time.
*/
static void
sbni_timeout(void *xsc)
{
struct sbni_softc *sc;
int s;
u_char csr0;
sc = (struct sbni_softc *)xsc;
s = splimp();
csr0 = sbni_inb(sc, CSR0);
if (csr0 & RC_CHK) {
if (sc->timer_ticks) {
if (csr0 & (RC_RDY | BU_EMP))
/* receiving not active */
sc->timer_ticks--;
} else {
sc->in_stats.timeout_number++;
if (sc->delta_rxl)
timeout_change_level(sc);
sbni_outb(sc, CSR1, *(u_char *)&sc->csr1 | PR_RES);
csr0 = sbni_inb(sc, CSR0);
}
}
sbni_outb(sc, CSR0, csr0 | RC_CHK);
sc->wch = timeout(sbni_timeout, sc, hz/SBNI_HZ);
splx(s);
}
/* -------------------------------------------------------------------------- */
static void
card_start(struct sbni_softc *sc)
{
sc->timer_ticks = CHANGE_LEVEL_START_TICKS;
sc->state &= ~(FL_WAIT_ACK | FL_NEED_RESEND);
sc->state |= FL_PREV_OK;
sc->inppos = 0;
sc->wait_frameno = 0;
sbni_outb(sc, CSR1, *(u_char *)&sc->csr1 | PR_RES);
sbni_outb(sc, CSR0, EN_INT);
}
/* -------------------------------------------------------------------------- */
/*
* Device timeout/watchdog routine. Entered if the device neglects to
* generate an interrupt after a transmit has been started on it.
*/
static void
sbni_watchdog(struct ifnet *ifp)
{
log(LOG_ERR, "%s: device timeout\n", ifp->if_xname);
ifp->if_oerrors++;
}
static u_char rxl_tab[] = {
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x08,
0x0a, 0x0c, 0x0f, 0x16, 0x18, 0x1a, 0x1c, 0x1f
};
#define SIZE_OF_TIMEOUT_RXL_TAB 4
static u_char timeout_rxl_tab[] = {
0x03, 0x05, 0x08, 0x0b
};
static void
set_initial_values(struct sbni_softc *sc, struct sbni_flags flags)
{
if (flags.fixed_rxl) {
sc->delta_rxl = 0; /* disable receive level autodetection */
sc->cur_rxl_index = flags.rxl;
} else {
sc->delta_rxl = DEF_RXL_DELTA;
sc->cur_rxl_index = DEF_RXL;
}
sc->csr1.rate = flags.fixed_rate ? flags.rate : DEFAULT_RATE;
sc->csr1.rxl = rxl_tab[sc->cur_rxl_index];
sc->maxframe = DEFAULT_FRAME_LEN;
/*
* generate Ethernet address (0x00ff01xxxxxx)
*/
*(u_int16_t *) sc->arpcom.ac_enaddr = htons(0x00ff);
if (flags.mac_addr) {
*(u_int32_t *) (sc->arpcom.ac_enaddr + 2) =
htonl(flags.mac_addr | 0x01000000);
} else {
*(u_char *) (sc->arpcom.ac_enaddr + 2) = 0x01;
read_random(sc->arpcom.ac_enaddr + 3, 3);
}
}
#ifdef SBNI_DUAL_COMPOUND
struct sbni_softc *
connect_to_master(struct sbni_softc *sc)
{
struct sbni_softc *p, *p_prev;
for (p = sbni_headlist, p_prev = NULL; p; p_prev = p, p = p->link) {
if (rman_get_start(p->io_res) == rman_get_start(sc->io_res) + 4 ||
rman_get_start(p->io_res) == rman_get_start(sc->io_res) - 4) {
p->slave_sc = sc;
if (p_prev)
p_prev->link = p->link;
else
sbni_headlist = p->link;
return p;
}
}
return (NULL);
}
#endif /* SBNI_DUAL_COMPOUND */
/* Receive level auto-selection */
static void
change_level(struct sbni_softc *sc)
{
if (sc->delta_rxl == 0) /* do not auto-negotiate RxL */
return;
if (sc->cur_rxl_index == 0)
sc->delta_rxl = 1;
else if (sc->cur_rxl_index == 15)
sc->delta_rxl = -1;
else if (sc->cur_rxl_rcvd < sc->prev_rxl_rcvd)
sc->delta_rxl = -sc->delta_rxl;
sc->csr1.rxl = rxl_tab[sc->cur_rxl_index += sc->delta_rxl];
sbni_inb(sc, CSR0); /* it needed for PCI cards */
sbni_outb(sc, CSR1, *(u_char *)&sc->csr1);
sc->prev_rxl_rcvd = sc->cur_rxl_rcvd;
sc->cur_rxl_rcvd = 0;
}
static void
timeout_change_level(struct sbni_softc *sc)
{
sc->cur_rxl_index = timeout_rxl_tab[sc->timeout_rxl];
if (++sc->timeout_rxl >= 4)
sc->timeout_rxl = 0;
sc->csr1.rxl = rxl_tab[sc->cur_rxl_index];
sbni_inb(sc, CSR0);
sbni_outb(sc, CSR1, *(u_char *)&sc->csr1);
sc->prev_rxl_rcvd = sc->cur_rxl_rcvd;
sc->cur_rxl_rcvd = 0;
}
/* -------------------------------------------------------------------------- */
/*
* Process an ioctl request. This code needs some work - it looks
* pretty ugly.
*/
static int
sbni_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
{
struct sbni_softc *sc;
struct ifreq *ifr;
struct thread *td;
struct sbni_in_stats *in_stats;
struct sbni_flags flags;
int error, s;
sc = ifp->if_softc;
ifr = (struct ifreq *)data;
td = curthread;
error = 0;
s = splimp();
switch (command) {
case SIOCSIFFLAGS:
/*
* If the interface is marked up and stopped, then start it.
* If it is marked down and running, then stop it.
*/
if (ifp->if_flags & IFF_UP) {
if (!(ifp->if_flags & IFF_RUNNING))
sbni_init(sc);
} else {
if (ifp->if_flags & IFF_RUNNING) {
sbni_stop(sc);
ifp->if_flags &= ~IFF_RUNNING;
}
}
break;
case SIOCADDMULTI:
case SIOCDELMULTI:
/*
* Multicast list has changed; set the hardware filter
* accordingly.
*/
error = 0;
/* if (ifr == NULL)
error = EAFNOSUPPORT; */
break;
case SIOCSIFMTU:
if (ifr->ifr_mtu > ETHERMTU)
error = EINVAL;
else
ifp->if_mtu = ifr->ifr_mtu;
break;
/*
* SBNI specific ioctl
*/
case SIOCGHWFLAGS: /* get flags */
bcopy((caddr_t) sc->arpcom.ac_enaddr+3, (caddr_t) &flags, 3);
flags.rxl = sc->cur_rxl_index;
flags.rate = sc->csr1.rate;
flags.fixed_rxl = (sc->delta_rxl == 0);
flags.fixed_rate = 1;
ifr->ifr_data = *(caddr_t*) &flags;
break;
case SIOCGINSTATS:
in_stats = (struct sbni_in_stats *)ifr->ifr_data;
bcopy((void *)(&(sc->in_stats)), (void *)in_stats,
sizeof(struct sbni_in_stats));
break;
case SIOCSHWFLAGS: /* set flags */
/* root only */
error = suser(td);
if (error)
break;
flags = *(struct sbni_flags*)&ifr->ifr_data;
if (flags.fixed_rxl) {
sc->delta_rxl = 0;
sc->cur_rxl_index = flags.rxl;
} else {
sc->delta_rxl = DEF_RXL_DELTA;
sc->cur_rxl_index = DEF_RXL;
}
sc->csr1.rxl = rxl_tab[sc->cur_rxl_index];
sc->csr1.rate = flags.fixed_rate ? flags.rate : DEFAULT_RATE;
if (flags.mac_addr)
bcopy((caddr_t) &flags,
(caddr_t) sc->arpcom.ac_enaddr+3, 3);
/* Don't be afraid... */
sbni_outb(sc, CSR1, *(char*)(&sc->csr1) | PR_RES);
break;
case SIOCRINSTATS:
if (!(error = suser(td))) /* root only */
bzero(&sc->in_stats, sizeof(struct sbni_in_stats));
break;
default:
error = ether_ioctl(ifp, command, data);
break;
}
splx(s);
return (error);
}
/* -------------------------------------------------------------------------- */
#ifdef ASM_CRC
static u_int32_t
calc_crc32(u_int32_t crc, caddr_t p, u_int len)
{
register u_int32_t _crc __asm ("ax");
_crc = crc;
__asm __volatile (
"xorl %%ebx, %%ebx\n"
"movl %1, %%esi\n"
"movl %2, %%ecx\n"
"movl $crc32tab, %%edi\n"
"shrl $2, %%ecx\n"
"jz 1f\n"
".align 4\n"
"0:\n"
"movb %%al, %%bl\n"
"movl (%%esi), %%edx\n"
"shrl $8, %%eax\n"
"xorb %%dl, %%bl\n"
"shrl $8, %%edx\n"
"xorl (%%edi,%%ebx,4), %%eax\n"
"movb %%al, %%bl\n"
"shrl $8, %%eax\n"
"xorb %%dl, %%bl\n"
"shrl $8, %%edx\n"
"xorl (%%edi,%%ebx,4), %%eax\n"
"movb %%al, %%bl\n"
"shrl $8, %%eax\n"
"xorb %%dl, %%bl\n"
"movb %%dh, %%dl\n"
"xorl (%%edi,%%ebx,4), %%eax\n"
"movb %%al, %%bl\n"
"shrl $8, %%eax\n"
"xorb %%dl, %%bl\n"
"addl $4, %%esi\n"
"xorl (%%edi,%%ebx,4), %%eax\n"
"decl %%ecx\n"
"jnz 0b\n"
"1:\n"
"movl %2, %%ecx\n"
"andl $3, %%ecx\n"
"jz 2f\n"
"movb %%al, %%bl\n"
"shrl $8, %%eax\n"
"xorb (%%esi), %%bl\n"
"xorl (%%edi,%%ebx,4), %%eax\n"
"decl %%ecx\n"
"jz 2f\n"
"movb %%al, %%bl\n"
"shrl $8, %%eax\n"
"xorb 1(%%esi), %%bl\n"
"xorl (%%edi,%%ebx,4), %%eax\n"
"decl %%ecx\n"
"jz 2f\n"
"movb %%al, %%bl\n"
"shrl $8, %%eax\n"
"xorb 2(%%esi), %%bl\n"
"xorl (%%edi,%%ebx,4), %%eax\n"
"2:\n"
: "=a" (_crc)
: "g" (p), "g" (len)
: "bx", "cx", "dx", "si", "di"
);
return (_crc);
}
#else /* ASM_CRC */
static u_int32_t
calc_crc32(u_int32_t crc, caddr_t p, u_int len)
{
while (len--)
crc = CRC32(*p++, crc);
return (crc);
}
#endif /* ASM_CRC */
static u_int32_t crc32tab[] __aligned(8) = {
0xD202EF8D, 0xA505DF1B, 0x3C0C8EA1, 0x4B0BBE37,
0xD56F2B94, 0xA2681B02, 0x3B614AB8, 0x4C667A2E,
0xDCD967BF, 0xABDE5729, 0x32D70693, 0x45D03605,
0xDBB4A3A6, 0xACB39330, 0x35BAC28A, 0x42BDF21C,
0xCFB5FFE9, 0xB8B2CF7F, 0x21BB9EC5, 0x56BCAE53,
0xC8D83BF0, 0xBFDF0B66, 0x26D65ADC, 0x51D16A4A,
0xC16E77DB, 0xB669474D, 0x2F6016F7, 0x58672661,
0xC603B3C2, 0xB1048354, 0x280DD2EE, 0x5F0AE278,
0xE96CCF45, 0x9E6BFFD3, 0x0762AE69, 0x70659EFF,
0xEE010B5C, 0x99063BCA, 0x000F6A70, 0x77085AE6,
0xE7B74777, 0x90B077E1, 0x09B9265B, 0x7EBE16CD,
0xE0DA836E, 0x97DDB3F8, 0x0ED4E242, 0x79D3D2D4,
0xF4DBDF21, 0x83DCEFB7, 0x1AD5BE0D, 0x6DD28E9B,
0xF3B61B38, 0x84B12BAE, 0x1DB87A14, 0x6ABF4A82,
0xFA005713, 0x8D076785, 0x140E363F, 0x630906A9,
0xFD6D930A, 0x8A6AA39C, 0x1363F226, 0x6464C2B0,
0xA4DEAE1D, 0xD3D99E8B, 0x4AD0CF31, 0x3DD7FFA7,
0xA3B36A04, 0xD4B45A92, 0x4DBD0B28, 0x3ABA3BBE,
0xAA05262F, 0xDD0216B9, 0x440B4703, 0x330C7795,
0xAD68E236, 0xDA6FD2A0, 0x4366831A, 0x3461B38C,
0xB969BE79, 0xCE6E8EEF, 0x5767DF55, 0x2060EFC3,
0xBE047A60, 0xC9034AF6, 0x500A1B4C, 0x270D2BDA,
0xB7B2364B, 0xC0B506DD, 0x59BC5767, 0x2EBB67F1,
0xB0DFF252, 0xC7D8C2C4, 0x5ED1937E, 0x29D6A3E8,
0x9FB08ED5, 0xE8B7BE43, 0x71BEEFF9, 0x06B9DF6F,
0x98DD4ACC, 0xEFDA7A5A, 0x76D32BE0, 0x01D41B76,
0x916B06E7, 0xE66C3671, 0x7F6567CB, 0x0862575D,
0x9606C2FE, 0xE101F268, 0x7808A3D2, 0x0F0F9344,
0x82079EB1, 0xF500AE27, 0x6C09FF9D, 0x1B0ECF0B,
0x856A5AA8, 0xF26D6A3E, 0x6B643B84, 0x1C630B12,
0x8CDC1683, 0xFBDB2615, 0x62D277AF, 0x15D54739,
0x8BB1D29A, 0xFCB6E20C, 0x65BFB3B6, 0x12B88320,
0x3FBA6CAD, 0x48BD5C3B, 0xD1B40D81, 0xA6B33D17,
0x38D7A8B4, 0x4FD09822, 0xD6D9C998, 0xA1DEF90E,
0x3161E49F, 0x4666D409, 0xDF6F85B3, 0xA868B525,
0x360C2086, 0x410B1010, 0xD80241AA, 0xAF05713C,
0x220D7CC9, 0x550A4C5F, 0xCC031DE5, 0xBB042D73,
0x2560B8D0, 0x52678846, 0xCB6ED9FC, 0xBC69E96A,
0x2CD6F4FB, 0x5BD1C46D, 0xC2D895D7, 0xB5DFA541,
0x2BBB30E2, 0x5CBC0074, 0xC5B551CE, 0xB2B26158,
0x04D44C65, 0x73D37CF3, 0xEADA2D49, 0x9DDD1DDF,
0x03B9887C, 0x74BEB8EA, 0xEDB7E950, 0x9AB0D9C6,
0x0A0FC457, 0x7D08F4C1, 0xE401A57B, 0x930695ED,
0x0D62004E, 0x7A6530D8, 0xE36C6162, 0x946B51F4,
0x19635C01, 0x6E646C97, 0xF76D3D2D, 0x806A0DBB,
0x1E0E9818, 0x6909A88E, 0xF000F934, 0x8707C9A2,
0x17B8D433, 0x60BFE4A5, 0xF9B6B51F, 0x8EB18589,
0x10D5102A, 0x67D220BC, 0xFEDB7106, 0x89DC4190,
0x49662D3D, 0x3E611DAB, 0xA7684C11, 0xD06F7C87,
0x4E0BE924, 0x390CD9B2, 0xA0058808, 0xD702B89E,
0x47BDA50F, 0x30BA9599, 0xA9B3C423, 0xDEB4F4B5,
0x40D06116, 0x37D75180, 0xAEDE003A, 0xD9D930AC,
0x54D13D59, 0x23D60DCF, 0xBADF5C75, 0xCDD86CE3,
0x53BCF940, 0x24BBC9D6, 0xBDB2986C, 0xCAB5A8FA,
0x5A0AB56B, 0x2D0D85FD, 0xB404D447, 0xC303E4D1,
0x5D677172, 0x2A6041E4, 0xB369105E, 0xC46E20C8,
0x72080DF5, 0x050F3D63, 0x9C066CD9, 0xEB015C4F,
0x7565C9EC, 0x0262F97A, 0x9B6BA8C0, 0xEC6C9856,
0x7CD385C7, 0x0BD4B551, 0x92DDE4EB, 0xE5DAD47D,
0x7BBE41DE, 0x0CB97148, 0x95B020F2, 0xE2B71064,
0x6FBF1D91, 0x18B82D07, 0x81B17CBD, 0xF6B64C2B,
0x68D2D988, 0x1FD5E91E, 0x86DCB8A4, 0xF1DB8832,
0x616495A3, 0x1663A535, 0x8F6AF48F, 0xF86DC419,
0x660951BA, 0x110E612C, 0x88073096, 0xFF000000
};