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freebsd-dev/sys/dev/en/midway.c
Kenjiro Cho fec4b7015e clean up the en driver since it will survice for a while by 
Harti Brandt's effort.
remove the DMA test to detect problems of the first generation PCI chipsets
back in 1998.
it is no longer needed and has been the source of the false alarm that
the driver uses too much stack space.
2003-03-12 10:28:26 +00:00

3374 lines
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/* $NetBSD: midway.c,v 1.30 1997/09/29 17:40:38 chuck Exp $ */
/* (sync'd to midway.c 1.68) */
/*
*
* Copyright (c) 1996 Charles D. Cranor and Washington University.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Charles D. Cranor and
* Washington University.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $FreeBSD$
*/
/*
*
* m i d w a y . c e n i 1 5 5 d r i v e r
*
* author: Chuck Cranor <chuck@ccrc.wustl.edu>
* started: spring, 1996 (written from scratch).
*
* notes from the author:
* Extra special thanks go to Werner Almesberger, EPFL LRC. Werner's
* ENI driver was especially useful in figuring out how this card works.
* I would also like to thank Werner for promptly answering email and being
* generally helpful.
*/
#undef EN_DEBUG
#undef EN_DEBUG_RANGE /* check ranges on en_read/en_write's? */
#define EN_MBUF_OPT /* try and put more stuff in mbuf? */
#define EN_DIAG
#define EN_STAT
#ifndef EN_DMA
#define EN_DMA 1 /* use dma? */
#endif
#define EN_NOTXDMA 0 /* hook to disable tx dma only */
#define EN_NORXDMA 0 /* hook to disable rx dma only */
#define EN_DDBHOOK 1 /* compile in ddb functions */
#if defined(MIDWAY_ADPONLY)
#define EN_ENIDMAFIX 0 /* no ENI cards to worry about */
#else
#define EN_ENIDMAFIX 1 /* avoid byte DMA on the ENI card (see below) */
#endif
/*
* note on EN_ENIDMAFIX: the byte aligner on the ENI version of the card
* appears to be broken. it works just fine if there is no load... however
* when the card is loaded the data get corrupted. to see this, one only
* has to use "telnet" over ATM. do the following command in "telnet":
* cat /usr/share/misc/termcap
* "telnet" seems to generate lots of 1023 byte mbufs (which make great
* use of the byte aligner). watch "netstat -s" for checksum errors.
*
* I further tested this by adding a function that compared the transmit
* data on the card's SRAM with the data in the mbuf chain _after_ the
* "transmit DMA complete" interrupt. using the "telnet" test I got data
* mismatches where the byte-aligned data should have been. using ddb
* and en_dumpmem() I verified that the DTQs fed into the card were
* absolutely correct. thus, we are forced to concluded that the ENI
* hardware is buggy. note that the Adaptec version of the card works
* just fine with byte DMA.
*
* bottom line: we set EN_ENIDMAFIX to 1 to avoid byte DMAs on the ENI
* card.
*/
#if defined(DIAGNOSTIC) && !defined(EN_DIAG)
#define EN_DIAG /* link in with master DIAG option */
#endif
#ifdef EN_STAT
#define EN_COUNT(X) (X)++
#else
#define EN_COUNT(X) /* nothing */
#endif
#ifdef EN_DEBUG
#undef EN_DDBHOOK
#define EN_DDBHOOK 1
#define STATIC /* nothing */
#define INLINE /* nothing */
#else /* EN_DEBUG */
#define STATIC static
#define INLINE __inline
#endif /* EN_DEBUG */
#ifdef __FreeBSD__
#include "opt_inet.h"
#include "opt_natm.h"
#include "opt_ddb.h"
/* enable DDBHOOK when DDB is available */
#undef EN_DDBHOOK
#ifdef DDB
#define EN_DDBHOOK 1
#endif
#endif
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/queue.h>
#if defined(__NetBSD__) || defined(__OpenBSD__) || defined(__bsdi__)
#include <sys/device.h>
#endif
#include <sys/sockio.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <net/if.h>
#include <net/if_atm.h>
#include <vm/vm.h>
#if defined(INET) || defined(INET6)
#include <netinet/in.h>
#include <netinet/if_atm.h>
#endif
#ifdef NATM
#include <netnatm/natm.h>
#endif
#if defined(__NetBSD__) || defined(__OpenBSD__)
#include <machine/bus.h>
#include <dev/ic/midwayreg.h>
#include <dev/ic/midwayvar.h>
#elif defined(__FreeBSD__)
#include <sys/bus.h>
#include <machine/bus.h>
#include <sys/rman.h>
#include <machine/resource.h>
#include <dev/en/midwayreg.h>
#include <dev/en/midwayvar.h>
#include <vm/pmap.h> /* for vtophys proto */
#ifndef IFF_NOTRAILERS
#define IFF_NOTRAILERS 0
#endif
#endif /* __FreeBSD__ */
#if defined(__alpha__)
/* XXX XXX NEED REAL DMA MAPPING SUPPORT XXX XXX */
#undef vtophys
#define vtophys(va) alpha_XXX_dmamap((vm_offset_t)(va))
#endif
#ifdef __FreeBSD__
#define NBPF 1
#else
#include "bpf.h"
#endif
#if NBPF > 0
#include <net/bpf.h>
#ifdef __FreeBSD__
#define BPFATTACH(ifp, dlt, hlen) bpfattach((ifp), (dlt), (hlen))
#else
#define BPFATTACH(ifp, dlt, hlen) bpfattach(&(ifp)->if_bpf, (ifp), (dlt), (hlen))
#define BPF_MTAP(ifp, m) bpf_mtap((ifp)->if_bpf, (m))
#endif
#endif /* NBPF > 0 */
/*
* params
*/
#ifndef EN_TXHIWAT
#define EN_TXHIWAT (64*1024) /* max 64 KB waiting to be DMAd out */
#endif
#ifndef EN_MINDMA
#define EN_MINDMA 32 /* don't DMA anything less than this (bytes) */
#endif
#define RX_NONE 0xffff /* recv VC not in use */
#define EN_OBHDR ATM_PH_DRIVER7 /* TBD in first mbuf ! */
#define EN_OBTRL ATM_PH_DRIVER8 /* PDU trailier in last mbuf ! */
#define ENOTHER_FREE 0x01 /* free rxslot */
#define ENOTHER_DRAIN 0x02 /* almost free (drain DRQ dma) */
#define ENOTHER_RAW 0x04 /* 'raw' access (aka boodi mode) */
#define ENOTHER_SWSL 0x08 /* in software service list */
static int en_dma = EN_DMA; /* use DMA (switch off for dbg) */
#ifndef __FreeBSD__
/*
* autoconfig attachments
*/
struct cfdriver en_cd = {
0, "en", DV_IFNET,
};
#endif
/*
* local structures
*/
/*
* params to en_txlaunch() function
*/
struct en_launch {
u_int32_t tbd1; /* TBD 1 */
u_int32_t tbd2; /* TBD 2 */
u_int32_t pdu1; /* PDU 1 (aal5) */
int nodma; /* don't use DMA */
int need; /* total space we need (pad out if less data) */
int mlen; /* length of mbuf (for dtq) */
struct mbuf *t; /* data */
u_int32_t aal; /* aal code */
u_int32_t atm_vci; /* vci */
u_int8_t atm_flags; /* flags */
};
/*
* dma table (index by # of words)
*
* plan A: use WMAYBE (obsolete)
* plan B: avoid WMAYBE
*/
struct en_dmatab {
u_int8_t bcode; /* code */
u_int8_t divshift; /* byte divisor */
};
static struct en_dmatab en_dma_planB[] = {
{ 0, 0 }, /* 0 */ { MIDDMA_WORD, 2}, /* 1 */
{ MIDDMA_2WORD, 3}, /* 2 */ { MIDDMA_WORD, 2}, /* 3 */
{ MIDDMA_4WORD, 4}, /* 4 */ { MIDDMA_WORD, 2}, /* 5 */
{ MIDDMA_2WORD, 3}, /* 6 */ { MIDDMA_WORD, 2}, /* 7 */
{ MIDDMA_8WORD, 5}, /* 8 */ { MIDDMA_WORD, 2}, /* 9 */
{ MIDDMA_2WORD, 3}, /* 10 */ { MIDDMA_WORD, 2}, /* 11 */
{ MIDDMA_4WORD, 4}, /* 12 */ { MIDDMA_WORD, 2}, /* 13 */
{ MIDDMA_2WORD, 3}, /* 14 */ { MIDDMA_WORD, 2}, /* 15 */
{ MIDDMA_16WORD, 6}, /* 16 */
};
static struct en_dmatab *en_dmaplan = en_dma_planB;
/*
* prototypes
*/
STATIC INLINE int en_b2sz(int) __attribute__ ((unused));
#ifdef EN_DDBHOOK
int en_dump(int,int);
int en_dumpmem(int,int,int);
#endif
STATIC void en_dmaprobe(struct en_softc *);
STATIC int en_dmaprobe_doit(struct en_softc *, u_int8_t *,
u_int8_t *, int);
STATIC INLINE int en_dqneed(struct en_softc *, caddr_t, u_int,
u_int) __attribute__ ((unused));
STATIC void en_init(struct en_softc *);
STATIC int en_ioctl(struct ifnet *, EN_IOCTL_CMDT, caddr_t);
STATIC INLINE int en_k2sz(int) __attribute__ ((unused));
STATIC void en_loadvc(struct en_softc *, int);
STATIC int en_mfix(struct en_softc *, struct mbuf **, struct mbuf *);
STATIC INLINE struct mbuf *en_mget(struct en_softc *, u_int,
u_int *) __attribute__ ((unused));
STATIC INLINE u_int32_t en_read(struct en_softc *,
u_int32_t) __attribute__ ((unused));
STATIC int en_rxctl(struct en_softc *, struct atm_pseudoioctl *, int);
STATIC void en_txdma(struct en_softc *, int);
STATIC void en_txlaunch(struct en_softc *, int,
struct en_launch *);
STATIC void en_service(struct en_softc *);
STATIC void en_start(struct ifnet *);
STATIC INLINE int en_sz2b(int) __attribute__ ((unused));
STATIC INLINE void en_write(struct en_softc *, u_int32_t,
u_int32_t) __attribute__ ((unused));
/*
* macros/inline
*/
/*
* raw read/write macros
*/
#define EN_READDAT(SC,R) en_read(SC,R)
#define EN_WRITEDAT(SC,R,V) en_write(SC,R,V)
/*
* cooked read/write macros
*/
#define EN_READ(SC,R) (u_int32_t)ntohl(en_read(SC,R))
#define EN_WRITE(SC,R,V) en_write(SC,R, htonl(V))
#define EN_WRAPADD(START,STOP,CUR,VAL) { \
(CUR) = (CUR) + (VAL); \
if ((CUR) >= (STOP)) \
(CUR) = (START) + ((CUR) - (STOP)); \
}
#define WORD_IDX(START, X) (((X) - (START)) / sizeof(u_int32_t))
/* we store sc->dtq and sc->drq data in the following format... */
#define EN_DQ_MK(SLOT,LEN) (((SLOT) << 20)|(LEN)|(0x80000))
/* the 0x80000 ensures we != 0 */
#define EN_DQ_SLOT(X) ((X) >> 20)
#define EN_DQ_LEN(X) ((X) & 0x3ffff)
/* format of DTQ/DRQ word 1 differs between ENI and ADP */
#if defined(MIDWAY_ENIONLY)
#define MID_MK_TXQ(SC,CNT,CHAN,END,BCODE) \
EN_WRITE((SC), (SC)->dtq_us, \
MID_MK_TXQ_ENI((CNT), (CHAN), (END), (BCODE)));
#define MID_MK_RXQ(SC,CNT,VCI,END,BCODE) \
EN_WRITE((SC), (SC)->drq_us, \
MID_MK_RXQ_ENI((CNT), (VCI), (END), (BCODE)));
#elif defined(MIDWAY_ADPONLY)
#define MID_MK_TXQ(SC,CNT,CHAN,END,JK) \
EN_WRITE((SC), (SC)->dtq_us, \
MID_MK_TXQ_ADP((CNT), (CHAN), (END), (JK)));
#define MID_MK_RXQ(SC,CNT,VCI,END,JK) \
EN_WRITE((SC), (SC)->drq_us, \
MID_MK_RXQ_ADP((CNT), (VCI), (END), (JK)));
#else
#define MID_MK_TXQ(SC,CNT,CHAN,END,JK_OR_BCODE) { \
if ((SC)->is_adaptec) \
EN_WRITE((SC), (SC)->dtq_us, \
MID_MK_TXQ_ADP((CNT), (CHAN), (END), (JK_OR_BCODE))); \
else \
EN_WRITE((SC), (SC)->dtq_us, \
MID_MK_TXQ_ENI((CNT), (CHAN), (END), (JK_OR_BCODE))); \
}
#define MID_MK_RXQ(SC,CNT,VCI,END,JK_OR_BCODE) { \
if ((SC)->is_adaptec) \
EN_WRITE((SC), (SC)->drq_us, \
MID_MK_RXQ_ADP((CNT), (VCI), (END), (JK_OR_BCODE))); \
else \
EN_WRITE((SC), (SC)->drq_us, \
MID_MK_RXQ_ENI((CNT), (VCI), (END), (JK_OR_BCODE))); \
}
#endif
/* add an item to the DTQ */
#define EN_DTQADD(SC,CNT,CHAN,JK_OR_BCODE,ADDR,LEN,END) { \
if (END) \
(SC)->dtq[MID_DTQ_A2REG((SC)->dtq_us)] = EN_DQ_MK(CHAN,LEN); \
MID_MK_TXQ(SC,CNT,CHAN,END,JK_OR_BCODE); \
(SC)->dtq_us += 4; \
EN_WRITE((SC), (SC)->dtq_us, (ADDR)); \
EN_WRAPADD(MID_DTQOFF, MID_DTQEND, (SC)->dtq_us, 4); \
(SC)->dtq_free--; \
if (END) \
EN_WRITE((SC), MID_DMA_WRTX, MID_DTQ_A2REG((SC)->dtq_us)); \
}
/* DRQ add macro */
#define EN_DRQADD(SC,CNT,VCI,JK_OR_BCODE,ADDR,LEN,SLOT,END) { \
if (END) \
(SC)->drq[MID_DRQ_A2REG((SC)->drq_us)] = EN_DQ_MK(SLOT,LEN); \
MID_MK_RXQ(SC,CNT,VCI,END,JK_OR_BCODE); \
(SC)->drq_us += 4; \
EN_WRITE((SC), (SC)->drq_us, (ADDR)); \
EN_WRAPADD(MID_DRQOFF, MID_DRQEND, (SC)->drq_us, 4); \
(SC)->drq_free--; \
if (END) \
EN_WRITE((SC), MID_DMA_WRRX, MID_DRQ_A2REG((SC)->drq_us)); \
}
/*
* the driver code
*
* the code is arranged in a specific way:
* [1] short/inline functions
* [2] autoconfig stuff
* [3] ioctl stuff
* [4] reset -> init -> trasmit -> intr -> receive functions
*
*/
/***********************************************************************/
/*
* en_read: read a word from the card. this is the only function
* that reads from the card.
*/
STATIC INLINE u_int32_t en_read(sc, r)
struct en_softc *sc;
u_int32_t r;
{
#ifdef EN_DEBUG_RANGE
if (r > MID_MAXOFF || (r % 4))
panic("en_read out of range, r=0x%x", r);
#endif
return(bus_space_read_4(sc->en_memt, sc->en_base, r));
}
/*
* en_write: write a word to the card. this is the only function that
* writes to the card.
*/
STATIC INLINE void en_write(sc, r, v)
struct en_softc *sc;
u_int32_t r, v;
{
#ifdef EN_DEBUG_RANGE
if (r > MID_MAXOFF || (r % 4))
panic("en_write out of range, r=0x%x", r);
#endif
bus_space_write_4(sc->en_memt, sc->en_base, r, v);
}
/*
* en_k2sz: convert KBytes to a size parameter (a log2)
*/
STATIC INLINE int en_k2sz(k)
int k;
{
switch(k) {
case 1: return(0);
case 2: return(1);
case 4: return(2);
case 8: return(3);
case 16: return(4);
case 32: return(5);
case 64: return(6);
case 128: return(7);
default: panic("en_k2sz");
}
return(0);
}
#define en_log2(X) en_k2sz(X)
/*
* en_b2sz: convert a DMA burst code to its byte size
*/
STATIC INLINE int en_b2sz(b)
int b;
{
switch (b) {
case MIDDMA_WORD: return(1*4);
case MIDDMA_2WMAYBE:
case MIDDMA_2WORD: return(2*4);
case MIDDMA_4WMAYBE:
case MIDDMA_4WORD: return(4*4);
case MIDDMA_8WMAYBE:
case MIDDMA_8WORD: return(8*4);
case MIDDMA_16WMAYBE:
case MIDDMA_16WORD: return(16*4);
default: panic("en_b2sz");
}
return(0);
}
/*
* en_sz2b: convert a burst size (bytes) to DMA burst code
*/
STATIC INLINE int en_sz2b(sz)
int sz;
{
switch (sz) {
case 1*4: return(MIDDMA_WORD);
case 2*4: return(MIDDMA_2WORD);
case 4*4: return(MIDDMA_4WORD);
case 8*4: return(MIDDMA_8WORD);
case 16*4: return(MIDDMA_16WORD);
default: panic("en_sz2b");
}
return(0);
}
/*
* en_dqneed: calculate number of DTQ/DRQ's needed for a buffer
*/
STATIC INLINE int en_dqneed(sc, data, len, tx)
struct en_softc *sc;
caddr_t data;
u_int len, tx;
{
int result, needalign, sz;
#if !defined(MIDWAY_ENIONLY)
#if !defined(MIDWAY_ADPONLY)
if (sc->is_adaptec)
#endif /* !MIDWAY_ADPONLY */
return(1); /* adaptec can DMA anything in one go */
#endif
#if !defined(MIDWAY_ADPONLY)
result = 0;
if (len < EN_MINDMA) {
if (!tx) /* XXX: conservative */
return(1); /* will copy/DMA_JK */
}
if (tx) { /* byte burst? */
needalign = (((uintptr_t) (void *) data) % sizeof(u_int32_t));
if (needalign) {
result++;
sz = min(len, sizeof(u_int32_t) - needalign);
len -= sz;
data += sz;
}
}
if (sc->alburst && len) {
needalign = (((uintptr_t) (void *) data) & sc->bestburstmask);
if (needalign) {
result++; /* alburst */
sz = min(len, sc->bestburstlen - needalign);
len -= sz;
}
}
if (len >= sc->bestburstlen) {
sz = len / sc->bestburstlen;
sz = sz * sc->bestburstlen;
len -= sz;
result++; /* best shot */
}
if (len) {
result++; /* clean up */
if (tx && (len % sizeof(u_int32_t)) != 0)
result++; /* byte cleanup */
}
return(result);
#endif /* !MIDWAY_ADPONLY */
}
/*
* en_mget: get an mbuf chain that can hold totlen bytes and return it
* (for recv) [based on am7990_get from if_le and ieget from if_ie]
* after this call the sum of all the m_len's in the chain will be totlen.
*/
STATIC INLINE struct mbuf *en_mget(sc, totlen, drqneed)
struct en_softc *sc;
u_int totlen, *drqneed;
{
struct mbuf *m;
struct mbuf *top, **mp;
*drqneed = 0;
MGETHDR(m, M_DONTWAIT, MT_DATA);
if (m == NULL)
return(NULL);
m->m_pkthdr.rcvif = &sc->enif;
m->m_pkthdr.len = totlen;
m->m_len = MHLEN;
top = NULL;
mp = &top;
/* if (top != NULL) then we've already got 1 mbuf on the chain */
while (totlen > 0) {
if (top) {
MGET(m, M_DONTWAIT, MT_DATA);
if (!m) {
m_freem(top);
return(NULL); /* out of mbufs */
}
m->m_len = MLEN;
}
if (totlen >= MINCLSIZE) {
MCLGET(m, M_DONTWAIT);
if ((m->m_flags & M_EXT) == 0) {
m_free(m);
m_freem(top);
return(NULL); /* out of mbuf clusters */
}
m->m_len = MCLBYTES;
}
m->m_len = min(totlen, m->m_len);
totlen -= m->m_len;
*mp = m;
mp = &m->m_next;
*drqneed += en_dqneed(sc, m->m_data, m->m_len, 0);
}
return(top);
}
/***********************************************************************/
/*
* autoconfig stuff
*/
void en_attach(sc)
struct en_softc *sc;
{
struct ifnet *ifp = &sc->enif;
int sz;
u_int32_t reg, lcv, check, ptr, sav, midvloc;
/*
* probe card to determine memory size. the stupid ENI card always
* reports to PCI that it needs 4MB of space (2MB regs and 2MB RAM).
* if it has less than 2MB RAM the addresses wrap in the RAM address space.
* (i.e. on a 512KB card addresses 0x3ffffc, 0x37fffc, and 0x2ffffc
* are aliases for 0x27fffc [note that RAM starts at offset 0x200000]).
*/
if (sc->en_busreset)
sc->en_busreset(sc);
EN_WRITE(sc, MID_RESID, 0x0); /* reset card before touching RAM */
for (lcv = MID_PROBEOFF; lcv <= MID_MAXOFF ; lcv += MID_PROBSIZE) {
EN_WRITE(sc, lcv, lcv); /* data[address] = address */
for (check = MID_PROBEOFF ; check < lcv ; check += MID_PROBSIZE) {
reg = EN_READ(sc, check);
if (reg != check) { /* found an alias! */
goto done_probe; /* and quit */
}
}
}
done_probe:
lcv -= MID_PROBSIZE; /* take one step back */
sc->en_obmemsz = (lcv + 4) - MID_RAMOFF;
/*
* determine the largest DMA burst supported
*/
en_dmaprobe(sc);
/*
* "hello world"
*/
if (sc->en_busreset)
sc->en_busreset(sc);
EN_WRITE(sc, MID_RESID, 0x0); /* reset */
for (lcv = MID_RAMOFF ; lcv < MID_RAMOFF + sc->en_obmemsz ; lcv += 4)
EN_WRITE(sc, lcv, 0); /* zero memory */
reg = EN_READ(sc, MID_RESID);
printf("%s: ATM midway v%d, board IDs %d.%d, %s%s%s, %ldKB on-board RAM\n",
sc->sc_dev.dv_xname, MID_VER(reg), MID_MID(reg), MID_DID(reg),
(MID_IS_SABRE(reg)) ? "sabre controller, " : "",
(MID_IS_SUNI(reg)) ? "SUNI" : "Utopia",
(!MID_IS_SUNI(reg) && MID_IS_UPIPE(reg)) ? " (pipelined)" : "",
(long)sc->en_obmemsz / 1024);
if (sc->is_adaptec) {
if (sc->bestburstlen == 64 && sc->alburst == 0)
printf("%s: passed 64 byte DMA test\n", sc->sc_dev.dv_xname);
else
printf("%s: FAILED DMA TEST: burst=%d, alburst=%d\n",
sc->sc_dev.dv_xname, sc->bestburstlen, sc->alburst);
} else {
printf("%s: maximum DMA burst length = %d bytes%s\n", sc->sc_dev.dv_xname,
sc->bestburstlen, (sc->alburst) ? " (must align)" : "");
}
/*
* link into network subsystem and prepare card
*/
#if defined(__NetBSD__) || defined(__OpenBSD__)
bcopy(sc->sc_dev.dv_xname, sc->enif.if_xname, IFNAMSIZ);
#endif
sc->enif.if_softc = sc;
ifp->if_flags = IFF_SIMPLEX|IFF_NOTRAILERS;
ifp->if_ioctl = en_ioctl;
ifp->if_output = atm_output;
ifp->if_start = en_start;
/*
* init softc
*/
for (lcv = 0 ; lcv < MID_N_VC ; lcv++) {
sc->rxvc2slot[lcv] = RX_NONE;
sc->txspeed[lcv] = 0; /* full */
sc->txvc2slot[lcv] = 0; /* full speed == slot 0 */
}
sz = sc->en_obmemsz - (MID_BUFOFF - MID_RAMOFF);
ptr = sav = MID_BUFOFF;
ptr = roundup(ptr, EN_TXSZ * 1024); /* align */
sz = sz - (ptr - sav);
if (EN_TXSZ*1024 * EN_NTX > sz) {
printf("%s: EN_NTX/EN_TXSZ too big\n", sc->sc_dev.dv_xname);
return;
}
for (lcv = 0 ; lcv < EN_NTX ; lcv++) {
sc->txslot[lcv].mbsize = 0;
sc->txslot[lcv].start = ptr;
ptr += (EN_TXSZ * 1024);
sz -= (EN_TXSZ * 1024);
sc->txslot[lcv].stop = ptr;
sc->txslot[lcv].nref = 0;
bzero(&sc->txslot[lcv].indma, sizeof(sc->txslot[lcv].indma));
bzero(&sc->txslot[lcv].q, sizeof(sc->txslot[lcv].q));
#ifdef EN_DEBUG
printf("%s: tx%d: start 0x%x, stop 0x%x\n", sc->sc_dev.dv_xname, lcv,
sc->txslot[lcv].start, sc->txslot[lcv].stop);
#endif
}
sav = ptr;
ptr = roundup(ptr, EN_RXSZ * 1024); /* align */
sz = sz - (ptr - sav);
sc->en_nrx = sz / (EN_RXSZ * 1024);
if (sc->en_nrx <= 0) {
printf("%s: EN_NTX/EN_TXSZ/EN_RXSZ too big\n", sc->sc_dev.dv_xname);
return;
}
/*
* ensure that there is always one VC slot on the service list free
* so that we can tell the difference between a full and empty list.
*/
if (sc->en_nrx >= MID_N_VC)
sc->en_nrx = MID_N_VC - 1;
for (lcv = 0 ; lcv < sc->en_nrx ; lcv++) {
sc->rxslot[lcv].rxhand = NULL;
sc->rxslot[lcv].oth_flags = ENOTHER_FREE;
bzero(&sc->rxslot[lcv].indma, sizeof(sc->rxslot[lcv].indma));
bzero(&sc->rxslot[lcv].q, sizeof(sc->rxslot[lcv].q));
midvloc = sc->rxslot[lcv].start = ptr;
ptr += (EN_RXSZ * 1024);
sz -= (EN_RXSZ * 1024);
sc->rxslot[lcv].stop = ptr;
midvloc = midvloc - MID_RAMOFF;
midvloc = (midvloc & ~((EN_RXSZ*1024) - 1)) >> 2; /* mask, cvt to words */
midvloc = midvloc >> MIDV_LOCTOPSHFT; /* we only want the top 11 bits */
midvloc = (midvloc & MIDV_LOCMASK) << MIDV_LOCSHIFT;
sc->rxslot[lcv].mode = midvloc |
(en_k2sz(EN_RXSZ) << MIDV_SZSHIFT) | MIDV_TRASH;
#ifdef EN_DEBUG
printf("%s: rx%d: start 0x%x, stop 0x%x, mode 0x%x\n", sc->sc_dev.dv_xname,
lcv, sc->rxslot[lcv].start, sc->rxslot[lcv].stop, sc->rxslot[lcv].mode);
#endif
}
#ifdef EN_STAT
sc->vtrash = sc->otrash = sc->mfix = sc->txmbovr = sc->dmaovr = 0;
sc->txoutspace = sc->txdtqout = sc->launch = sc->lheader = sc->ltail = 0;
sc->hwpull = sc->swadd = sc->rxqnotus = sc->rxqus = sc->rxoutboth = 0;
sc->rxdrqout = sc->ttrash = sc->rxmbufout = sc->mfixfail = 0;
sc->headbyte = sc->tailbyte = sc->tailflush = 0;
#endif
sc->need_drqs = sc->need_dtqs = 0;
printf("%s: %d %dKB receive buffers, %d %dKB transmit buffers allocated\n",
sc->sc_dev.dv_xname, sc->en_nrx, EN_RXSZ, EN_NTX, EN_TXSZ);
printf("%s: End Station Identifier (mac address) %6D\n",
sc->sc_dev.dv_xname, sc->macaddr, ":");
/*
* final commit
*/
if_attach(ifp);
atm_ifattach(ifp);
#if NBPF > 0
BPFATTACH(ifp, DLT_ATM_RFC1483, sizeof(struct atmllc));
#endif
}
/*
* en_dmaprobe: helper function for en_attach.
*
* see how the card handles DMA by running a few DMA tests. we need
* to figure out the largest number of bytes we can DMA in one burst
* ("bestburstlen"), and if the starting address for a burst needs to
* be aligned on any sort of boundary or not ("alburst").
*
* typical findings:
* sparc1: bestburstlen=4, alburst=0 (ick, broken DMA!)
* sparc2: bestburstlen=64, alburst=1
* p166: bestburstlen=64, alburst=0
*/
STATIC void en_dmaprobe(sc)
struct en_softc *sc;
{
u_int32_t srcbuf[64], dstbuf[64];
u_int8_t *sp, *dp;
int bestalgn, bestnotalgn, lcv, try;
sc->alburst = 0;
sp = (u_int8_t *) srcbuf;
while ((((unsigned long) sp) % MIDDMA_MAXBURST) != 0)
sp += 4;
dp = (u_int8_t *) dstbuf;
while ((((unsigned long) dp) % MIDDMA_MAXBURST) != 0)
dp += 4;
bestalgn = bestnotalgn = en_dmaprobe_doit(sc, sp, dp, 0);
for (lcv = 4 ; lcv < MIDDMA_MAXBURST ; lcv += 4) {
try = en_dmaprobe_doit(sc, sp+lcv, dp+lcv, 0);
if (try < bestnotalgn)
bestnotalgn = try;
}
if (bestalgn != bestnotalgn) /* need bursts aligned */
sc->alburst = 1;
sc->bestburstlen = bestalgn;
sc->bestburstshift = en_log2(bestalgn);
sc->bestburstmask = sc->bestburstlen - 1; /* must be power of 2 */
sc->bestburstcode = en_sz2b(bestalgn);
#if 1 /* __FreeBSD__ */
/*
* correct pci chipsets should be able to handle misaligned-64-byte DMA.
* but there are too many broken chipsets around. we try to work around
* by finding the best workable dma size, but still some broken machines
* exhibit the problem later. so warn it here.
*/
if (bestalgn != 64 || sc->alburst != 0) {
printf("%s: WARNING: DMA test detects a broken PCI chipset!\n",
sc->sc_dev.dv_xname);
printf(" trying to work around the problem... but if this doesn't\n");
printf(" work for you, you'd better switch to a newer motherboard.\n");
}
#endif /* 1 */
return;
}
/*
* en_dmaprobe_doit: do actual testing
*/
STATIC int
en_dmaprobe_doit(sc, sp, dp, wmtry)
struct en_softc *sc;
u_int8_t *sp, *dp;
int wmtry;
{
int lcv, retval = 4, cnt, count;
u_int32_t reg, bcode, midvloc;
/*
* set up a 1k buffer at MID_BUFOFF
*/
if (sc->en_busreset)
sc->en_busreset(sc);
EN_WRITE(sc, MID_RESID, 0x0); /* reset card before touching RAM */
midvloc = ((MID_BUFOFF - MID_RAMOFF) / sizeof(u_int32_t)) >> MIDV_LOCTOPSHFT;
EN_WRITE(sc, MIDX_PLACE(0), MIDX_MKPLACE(en_k2sz(1), midvloc));
EN_WRITE(sc, MID_VC(0), (midvloc << MIDV_LOCSHIFT)
| (en_k2sz(1) << MIDV_SZSHIFT) | MIDV_TRASH);
EN_WRITE(sc, MID_DST_RP(0), 0);
EN_WRITE(sc, MID_WP_ST_CNT(0), 0);
for (lcv = 0 ; lcv < 68 ; lcv++) /* set up sample data */
sp[lcv] = lcv+1;
EN_WRITE(sc, MID_MAST_CSR, MID_MCSR_ENDMA); /* enable DMA (only) */
sc->drq_chip = MID_DRQ_REG2A(EN_READ(sc, MID_DMA_RDRX));
sc->dtq_chip = MID_DTQ_REG2A(EN_READ(sc, MID_DMA_RDTX));
/*
* try it now . . . DMA it out, then DMA it back in and compare
*
* note: in order to get the dma stuff to reverse directions it wants
* the "end" flag set! since we are not dma'ing valid data we may
* get an ident mismatch interrupt (which we will ignore).
*
* note: we've got two different tests rolled up in the same loop
* if (wmtry)
* then we are doing a wmaybe test and wmtry is a byte count
* else we are doing a burst test
*/
for (lcv = 8 ; lcv <= MIDDMA_MAXBURST ; lcv = lcv * 2) {
#ifdef EN_DEBUG
printf("DMA test lcv=%d, sp=0x%lx, dp=0x%lx, wmtry=%d\n",
lcv, (unsigned long)sp, (unsigned long)dp, wmtry);
#endif
/* zero SRAM and dest buffer */
for (cnt = 0 ; cnt < 1024; cnt += 4)
EN_WRITE(sc, MID_BUFOFF+cnt, 0); /* zero memory */
for (cnt = 0 ; cnt < 68 ; cnt++)
dp[cnt] = 0;
if (wmtry) {
count = (sc->bestburstlen - sizeof(u_int32_t)) / sizeof(u_int32_t);
bcode = en_dmaplan[count].bcode;
count = wmtry >> en_dmaplan[count].divshift;
} else {
bcode = en_sz2b(lcv);
count = 1;
}
if (sc->is_adaptec)
EN_WRITE(sc, sc->dtq_chip, MID_MK_TXQ_ADP(lcv, 0, MID_DMA_END, 0));
else
EN_WRITE(sc, sc->dtq_chip, MID_MK_TXQ_ENI(count, 0, MID_DMA_END, bcode));
EN_WRITE(sc, sc->dtq_chip+4, vtophys(sp));
EN_WRITE(sc, MID_DMA_WRTX, MID_DTQ_A2REG(sc->dtq_chip+8));
cnt = 1000;
while (EN_READ(sc, MID_DMA_RDTX) == MID_DTQ_A2REG(sc->dtq_chip)) {
DELAY(1);
cnt--;
if (cnt == 0) {
printf("%s: unexpected timeout in tx DMA test\n", sc->sc_dev.dv_xname);
return(retval); /* timeout, give up */
}
}
EN_WRAPADD(MID_DTQOFF, MID_DTQEND, sc->dtq_chip, 8);
reg = EN_READ(sc, MID_INTACK);
if ((reg & MID_INT_DMA_TX) != MID_INT_DMA_TX) {
printf("%s: unexpected status in tx DMA test: 0x%x\n",
sc->sc_dev.dv_xname, reg);
return(retval);
}
EN_WRITE(sc, MID_MAST_CSR, MID_MCSR_ENDMA); /* re-enable DMA (only) */
/* "return to sender..." address is known ... */
if (sc->is_adaptec)
EN_WRITE(sc, sc->drq_chip, MID_MK_RXQ_ADP(lcv, 0, MID_DMA_END, 0));
else
EN_WRITE(sc, sc->drq_chip, MID_MK_RXQ_ENI(count, 0, MID_DMA_END, bcode));
EN_WRITE(sc, sc->drq_chip+4, vtophys(dp));
EN_WRITE(sc, MID_DMA_WRRX, MID_DRQ_A2REG(sc->drq_chip+8));
cnt = 1000;
while (EN_READ(sc, MID_DMA_RDRX) == MID_DRQ_A2REG(sc->drq_chip)) {
DELAY(1);
cnt--;
if (cnt == 0) {
printf("%s: unexpected timeout in rx DMA test\n", sc->sc_dev.dv_xname);
return(retval); /* timeout, give up */
}
}
EN_WRAPADD(MID_DRQOFF, MID_DRQEND, sc->drq_chip, 8);
reg = EN_READ(sc, MID_INTACK);
if ((reg & MID_INT_DMA_RX) != MID_INT_DMA_RX) {
printf("%s: unexpected status in rx DMA test: 0x%x\n",
sc->sc_dev.dv_xname, reg);
return(retval);
}
EN_WRITE(sc, MID_MAST_CSR, MID_MCSR_ENDMA); /* re-enable DMA (only) */
if (wmtry) {
return(bcmp(sp, dp, wmtry)); /* wmtry always exits here, no looping */
}
if (bcmp(sp, dp, lcv))
return(retval); /* failed, use last value */
retval = lcv;
}
return(retval); /* studly 64 byte DMA present! oh baby!! */
}
/***********************************************************************/
/*
* en_ioctl: handle ioctl requests
*
* NOTE: if you add an ioctl to set txspeed, you should choose a new
* TX channel/slot. Choose the one with the lowest sc->txslot[slot].nref
* value, subtract one from sc->txslot[0].nref, add one to the
* sc->txslot[slot].nref, set sc->txvc2slot[vci] = slot, and then set
* txspeed[vci].
*/
STATIC int en_ioctl(ifp, cmd, data)
struct ifnet *ifp;
EN_IOCTL_CMDT cmd;
caddr_t data;
{
struct en_softc *sc = (struct en_softc *) ifp->if_softc;
struct ifaddr *ifa = (struct ifaddr *) data;
struct ifreq *ifr = (struct ifreq *) data;
struct atm_pseudoioctl *api = (struct atm_pseudoioctl *)data;
#ifdef NATM
struct atm_rawioctl *ario = (struct atm_rawioctl *)data;
int slot;
#endif
int s, error = 0;
s = splnet();
switch (cmd) {
case SIOCATMENA: /* enable circuit for recv */
error = en_rxctl(sc, api, 1);
break;
case SIOCATMDIS: /* disable circuit for recv */
error = en_rxctl(sc, api, 0);
break;
#ifdef NATM
case SIOCXRAWATM:
if ((slot = sc->rxvc2slot[ario->npcb->npcb_vci]) == RX_NONE) {
error = EINVAL;
break;
}
if (ario->rawvalue > EN_RXSZ*1024)
ario->rawvalue = EN_RXSZ*1024;
if (ario->rawvalue) {
sc->rxslot[slot].oth_flags |= ENOTHER_RAW;
sc->rxslot[slot].raw_threshold = ario->rawvalue;
} else {
sc->rxslot[slot].oth_flags &= (~ENOTHER_RAW);
sc->rxslot[slot].raw_threshold = 0;
}
#ifdef EN_DEBUG
printf("%s: rxvci%d: turn %s raw (boodi) mode\n",
sc->sc_dev.dv_xname, ario->npcb->npcb_vci,
(ario->rawvalue) ? "on" : "off");
#endif
break;
#endif
case SIOCSIFADDR:
ifp->if_flags |= IFF_UP;
#if defined(INET) || defined(INET6)
if (ifa->ifa_addr->sa_family == AF_INET
|| ifa->ifa_addr->sa_family == AF_INET6) {
en_reset(sc);
en_init(sc);
ifa->ifa_rtrequest = atm_rtrequest; /* ??? */
break;
}
#endif /* INET */
/* what to do if not INET? */
en_reset(sc);
en_init(sc);
break;
case SIOCGIFADDR:
error = EINVAL;
break;
case SIOCSIFFLAGS:
error = EINVAL;
break;
#if defined(SIOCSIFMTU) /* ??? copied from if_de */
#if !defined(ifr_mtu)
#define ifr_mtu ifr_metric
#endif
case SIOCSIFMTU:
/*
* Set the interface MTU.
*/
#ifdef notsure
if (ifr->ifr_mtu > ATMMTU) {
error = EINVAL;
break;
}
#endif
ifp->if_mtu = ifr->ifr_mtu;
/* XXXCDC: do we really need to reset on MTU size change? */
en_reset(sc);
en_init(sc);
break;
#endif /* SIOCSIFMTU */
default:
error = EINVAL;
break;
}
splx(s);
return error;
}
/*
* en_rxctl: turn on and off VCs for recv.
*/
STATIC int en_rxctl(sc, pi, on)
struct en_softc *sc;
struct atm_pseudoioctl *pi;
int on;
{
u_int s, vci, flags, slot;
u_int32_t oldmode, newmode;
vci = ATM_PH_VCI(&pi->aph);
flags = ATM_PH_FLAGS(&pi->aph);
#ifdef EN_DEBUG
printf("%s: %s vpi=%d, vci=%d, flags=%d\n", sc->sc_dev.dv_xname,
(on) ? "enable" : "disable", ATM_PH_VPI(&pi->aph), vci, flags);
#endif
if (ATM_PH_VPI(&pi->aph) || vci >= MID_N_VC)
return(EINVAL);
/*
* turn on VCI!
*/
if (on) {
if (sc->rxvc2slot[vci] != RX_NONE)
return(EINVAL);
for (slot = 0 ; slot < sc->en_nrx ; slot++)
if (sc->rxslot[slot].oth_flags & ENOTHER_FREE)
break;
if (slot == sc->en_nrx)
return(ENOSPC);
sc->rxvc2slot[vci] = slot;
sc->rxslot[slot].rxhand = NULL;
oldmode = sc->rxslot[slot].mode;
newmode = (flags & ATM_PH_AAL5) ? MIDV_AAL5 : MIDV_NOAAL;
sc->rxslot[slot].mode = MIDV_SETMODE(oldmode, newmode);
sc->rxslot[slot].atm_vci = vci;
sc->rxslot[slot].atm_flags = flags;
sc->rxslot[slot].oth_flags = 0;
sc->rxslot[slot].rxhand = pi->rxhand;
if (sc->rxslot[slot].indma.ifq_head || sc->rxslot[slot].q.ifq_head)
panic("en_rxctl: left over mbufs on enable");
sc->txspeed[vci] = 0; /* full speed to start */
sc->txvc2slot[vci] = 0; /* init value */
sc->txslot[0].nref++; /* bump reference count */
en_loadvc(sc, vci); /* does debug printf for us */
return(0);
}
/*
* turn off VCI
*/
if (sc->rxvc2slot[vci] == RX_NONE)
return(EINVAL);
slot = sc->rxvc2slot[vci];
if ((sc->rxslot[slot].oth_flags & (ENOTHER_FREE|ENOTHER_DRAIN)) != 0)
return(EINVAL);
s = splimp(); /* block out enintr() */
oldmode = EN_READ(sc, MID_VC(vci));
newmode = MIDV_SETMODE(oldmode, MIDV_TRASH) & ~MIDV_INSERVICE;
EN_WRITE(sc, MID_VC(vci), (newmode | (oldmode & MIDV_INSERVICE)));
/* halt in tracks, be careful to preserve inserivce bit */
DELAY(27);
sc->rxslot[slot].rxhand = NULL;
sc->rxslot[slot].mode = newmode;
sc->txslot[sc->txvc2slot[vci]].nref--;
sc->txspeed[vci] = 0;
sc->txvc2slot[vci] = 0;
/* if stuff is still going on we are going to have to drain it out */
if (sc->rxslot[slot].indma.ifq_head ||
sc->rxslot[slot].q.ifq_head ||
(sc->rxslot[slot].oth_flags & ENOTHER_SWSL) != 0) {
sc->rxslot[slot].oth_flags |= ENOTHER_DRAIN;
} else {
sc->rxslot[slot].oth_flags = ENOTHER_FREE;
sc->rxslot[slot].atm_vci = RX_NONE;
sc->rxvc2slot[vci] = RX_NONE;
}
splx(s); /* enable enintr() */
#ifdef EN_DEBUG
printf("%s: rx%d: VCI %d is now %s\n", sc->sc_dev.dv_xname, slot, vci,
(sc->rxslot[slot].oth_flags & ENOTHER_DRAIN) ? "draining" : "free");
#endif
return(0);
}
/***********************************************************************/
/*
* en_reset: reset the board, throw away work in progress.
* must en_init to recover.
*/
void en_reset(sc)
struct en_softc *sc;
{
struct mbuf *m;
int lcv, slot;
#ifdef EN_DEBUG
printf("%s: reset\n", sc->sc_dev.dv_xname);
#endif
if (sc->en_busreset)
sc->en_busreset(sc);
EN_WRITE(sc, MID_RESID, 0x0); /* reset hardware */
/*
* recv: dump any mbufs we are dma'ing into, if DRAINing, then a reset
* will free us!
*/
for (lcv = 0 ; lcv < MID_N_VC ; lcv++) {
if (sc->rxvc2slot[lcv] == RX_NONE)
continue;
slot = sc->rxvc2slot[lcv];
while (1) {
_IF_DEQUEUE(&sc->rxslot[slot].indma, m);
if (m == NULL)
break; /* >>> exit 'while(1)' here <<< */
m_freem(m);
}
while (1) {
_IF_DEQUEUE(&sc->rxslot[slot].q, m);
if (m == NULL)
break; /* >>> exit 'while(1)' here <<< */
m_freem(m);
}
sc->rxslot[slot].oth_flags &= ~ENOTHER_SWSL;
if (sc->rxslot[slot].oth_flags & ENOTHER_DRAIN) {
sc->rxslot[slot].oth_flags = ENOTHER_FREE;
sc->rxvc2slot[lcv] = RX_NONE;
#ifdef EN_DEBUG
printf("%s: rx%d: VCI %d is now free\n", sc->sc_dev.dv_xname, slot, lcv);
#endif
}
}
/*
* xmit: dump everything
*/
for (lcv = 0 ; lcv < EN_NTX ; lcv++) {
while (1) {
_IF_DEQUEUE(&sc->txslot[lcv].indma, m);
if (m == NULL)
break; /* >>> exit 'while(1)' here <<< */
m_freem(m);
}
while (1) {
_IF_DEQUEUE(&sc->txslot[lcv].q, m);
if (m == NULL)
break; /* >>> exit 'while(1)' here <<< */
m_freem(m);
}
sc->txslot[lcv].mbsize = 0;
}
return;
}
/*
* en_init: init board and sync the card with the data in the softc.
*/
STATIC void en_init(sc)
struct en_softc *sc;
{
int vc, slot;
u_int32_t loc;
if ((sc->enif.if_flags & IFF_UP) == 0) {
#ifdef EN_DEBUG
printf("%s: going down\n", sc->sc_dev.dv_xname);
#endif
en_reset(sc); /* to be safe */
sc->enif.if_flags &= ~IFF_RUNNING; /* disable */
return;
}
#ifdef EN_DEBUG
printf("%s: going up\n", sc->sc_dev.dv_xname);
#endif
sc->enif.if_flags |= IFF_RUNNING; /* enable */
if (sc->en_busreset)
sc->en_busreset(sc);
EN_WRITE(sc, MID_RESID, 0x0); /* reset */
/*
* init obmem data structures: vc tab, dma q's, slist.
*
* note that we set drq_free/dtq_free to one less than the total number
* of DTQ/DRQs present. we do this because the card uses the condition
* (drq_chip == drq_us) to mean "list is empty"... but if you allow the
* circular list to be completely full then (drq_chip == drq_us) [i.e.
* the drq_us pointer will wrap all the way around]. by restricting
* the number of active requests to (N - 1) we prevent the list from
* becoming completely full. note that the card will sometimes give
* us an interrupt for a DTQ/DRQ we have already processes... this helps
* keep that interrupt from messing us up.
*/
for (vc = 0 ; vc < MID_N_VC ; vc++)
en_loadvc(sc, vc);
bzero(&sc->drq, sizeof(sc->drq));
sc->drq_free = MID_DRQ_N - 1; /* N - 1 */
sc->drq_chip = MID_DRQ_REG2A(EN_READ(sc, MID_DMA_RDRX));
EN_WRITE(sc, MID_DMA_WRRX, MID_DRQ_A2REG(sc->drq_chip));
/* ensure zero queue */
sc->drq_us = sc->drq_chip;
bzero(&sc->dtq, sizeof(sc->dtq));
sc->dtq_free = MID_DTQ_N - 1; /* N - 1 */
sc->dtq_chip = MID_DTQ_REG2A(EN_READ(sc, MID_DMA_RDTX));
EN_WRITE(sc, MID_DMA_WRTX, MID_DRQ_A2REG(sc->dtq_chip));
/* ensure zero queue */
sc->dtq_us = sc->dtq_chip;
sc->hwslistp = MID_SL_REG2A(EN_READ(sc, MID_SERV_WRITE));
sc->swsl_size = sc->swsl_head = sc->swsl_tail = 0;
#ifdef EN_DEBUG
printf("%s: drq free/chip: %d/0x%x, dtq free/chip: %d/0x%x, hwslist: 0x%x\n",
sc->sc_dev.dv_xname, sc->drq_free, sc->drq_chip,
sc->dtq_free, sc->dtq_chip, sc->hwslistp);
#endif
for (slot = 0 ; slot < EN_NTX ; slot++) {
sc->txslot[slot].bfree = EN_TXSZ * 1024;
EN_WRITE(sc, MIDX_READPTR(slot), 0);
EN_WRITE(sc, MIDX_DESCSTART(slot), 0);
loc = sc->txslot[slot].cur = sc->txslot[slot].start;
loc = loc - MID_RAMOFF;
loc = (loc & ~((EN_TXSZ*1024) - 1)) >> 2; /* mask, cvt to words */
loc = loc >> MIDV_LOCTOPSHFT; /* top 11 bits */
EN_WRITE(sc, MIDX_PLACE(slot), MIDX_MKPLACE(en_k2sz(EN_TXSZ), loc));
#ifdef EN_DEBUG
printf("%s: tx%d: place 0x%x\n", sc->sc_dev.dv_xname, slot,
(u_int)EN_READ(sc, MIDX_PLACE(slot)));
#endif
}
/*
* enable!
*/
EN_WRITE(sc, MID_INTENA, MID_INT_TX|MID_INT_DMA_OVR|MID_INT_IDENT|
MID_INT_LERR|MID_INT_DMA_ERR|MID_INT_DMA_RX|MID_INT_DMA_TX|
MID_INT_SERVICE| /* >>> MID_INT_SUNI| XXXCDC<<< */ MID_INT_STATS);
EN_WRITE(sc, MID_MAST_CSR, MID_SETIPL(sc->ipl)|MID_MCSR_ENDMA|
MID_MCSR_ENTX|MID_MCSR_ENRX);
}
/*
* en_loadvc: load a vc tab entry from a slot
*/
STATIC void en_loadvc(sc, vc)
struct en_softc *sc;
int vc;
{
int slot;
u_int32_t reg = EN_READ(sc, MID_VC(vc));
reg = MIDV_SETMODE(reg, MIDV_TRASH);
EN_WRITE(sc, MID_VC(vc), reg);
DELAY(27);
if ((slot = sc->rxvc2slot[vc]) == RX_NONE)
return;
/* no need to set CRC */
EN_WRITE(sc, MID_DST_RP(vc), 0); /* read pointer = 0, desc. start = 0 */
EN_WRITE(sc, MID_WP_ST_CNT(vc), 0); /* write pointer = 0 */
EN_WRITE(sc, MID_VC(vc), sc->rxslot[slot].mode); /* set mode, size, loc */
sc->rxslot[slot].cur = sc->rxslot[slot].start;
#ifdef EN_DEBUG
printf("%s: rx%d: assigned to VCI %d\n", sc->sc_dev.dv_xname, slot, vc);
#endif
}
/*
* en_start: start transmitting the next packet that needs to go out
* if there is one. note that atm_output() has already splimp()'d us.
*/
STATIC void en_start(ifp)
struct ifnet *ifp;
{
struct en_softc *sc = (struct en_softc *) ifp->if_softc;
struct ifqueue *ifq = &ifp->if_snd; /* if INPUT QUEUE */
struct mbuf *m, *lastm, *prev;
struct atm_pseudohdr *ap, *new_ap;
int txchan, mlen, got, need, toadd, cellcnt, first;
u_int32_t atm_vpi, atm_vci, atm_flags, *dat, aal;
u_int8_t *cp;
if ((ifp->if_flags & IFF_RUNNING) == 0)
return;
/*
* remove everything from interface queue since we handle all queueing
* locally ...
*/
while (1) {
IF_DEQUEUE(ifq, m);
if (m == NULL)
return; /* EMPTY: >>> exit here <<< */
/*
* calculate size of packet (in bytes)
* also, if we are not doing transmit DMA we eliminate all stupid
* (non-word) alignments here using en_mfix(). calls to en_mfix()
* seem to be due to tcp retransmits for the most part.
*
* after this loop mlen total length of mbuf chain (including atm_ph),
* and lastm is a pointer to the last mbuf on the chain.
*/
lastm = m;
mlen = 0;
prev = NULL;
while (1) {
/* no DMA? */
if ((!sc->is_adaptec && EN_ENIDMAFIX) || EN_NOTXDMA || !en_dma) {
if ( ((uintptr_t)mtod(lastm, void *) % sizeof(u_int32_t)) != 0 ||
((lastm->m_len % sizeof(u_int32_t)) != 0 && lastm->m_next)) {
first = (lastm == m);
if (en_mfix(sc, &lastm, prev) == 0) { /* failed? */
m_freem(m);
m = NULL;
break;
}
if (first)
m = lastm; /* update */
}
prev = lastm;
}
mlen += lastm->m_len;
if (lastm->m_next == NULL)
break;
lastm = lastm->m_next;
}
if (m == NULL) /* happens only if mfix fails */
continue;
ap = mtod(m, struct atm_pseudohdr *);
atm_vpi = ATM_PH_VPI(ap);
atm_vci = ATM_PH_VCI(ap);
atm_flags = ATM_PH_FLAGS(ap) & ~(EN_OBHDR|EN_OBTRL);
aal = ((atm_flags & ATM_PH_AAL5) != 0)
? MID_TBD_AAL5 : MID_TBD_NOAAL5;
/*
* check that vpi/vci is one we can use
*/
if (atm_vpi || atm_vci > MID_N_VC) {
printf("%s: output vpi=%d, vci=%d out of card range, dropping...\n",
sc->sc_dev.dv_xname, atm_vpi, atm_vci);
m_freem(m);
continue;
}
/*
* computing how much padding we need on the end of the mbuf, then
* see if we can put the TBD at the front of the mbuf where the
* link header goes (well behaved protocols will reserve room for us).
* last, check if room for PDU tail.
*
* got = number of bytes of data we have
* cellcnt = number of cells in this mbuf
* need = number of bytes of data + padding we need (excludes TBD)
* toadd = number of bytes of data we need to add to end of mbuf,
* [including AAL5 PDU, if AAL5]
*/
got = mlen - sizeof(struct atm_pseudohdr);
toadd = (aal == MID_TBD_AAL5) ? MID_PDU_SIZE : 0; /* PDU */
cellcnt = (got + toadd + (MID_ATMDATASZ - 1)) / MID_ATMDATASZ;
need = cellcnt * MID_ATMDATASZ;
toadd = need - got; /* recompute, including zero padding */
#ifdef EN_DEBUG
printf("%s: txvci%d: mlen=%d, got=%d, need=%d, toadd=%d, cell#=%d\n",
sc->sc_dev.dv_xname, atm_vci, mlen, got, need, toadd, cellcnt);
printf(" leading_space=%d, trailing_space=%d\n",
(int)M_LEADINGSPACE(m), (int)M_TRAILINGSPACE(lastm));
#endif
#ifdef EN_MBUF_OPT
/*
* note: external storage (M_EXT) can be shared between mbufs
* to avoid copying (see m_copym()). this means that the same
* data buffer could be shared by several mbufs, and thus it isn't
* a good idea to try and write TBDs or PDUs to M_EXT data areas.
*/
if (M_LEADINGSPACE(m) >= MID_TBD_SIZE && (m->m_flags & M_EXT) == 0) {
m->m_data -= MID_TBD_SIZE;
m->m_len += MID_TBD_SIZE;
mlen += MID_TBD_SIZE;
new_ap = mtod(m, struct atm_pseudohdr *);
*new_ap = *ap; /* move it back */
ap = new_ap;
dat = ((u_int32_t *) ap) + 1;
/* make sure the TBD is in proper byte order */
*dat++ = htonl(MID_TBD_MK1(aal, sc->txspeed[atm_vci], cellcnt));
*dat = htonl(MID_TBD_MK2(atm_vci, 0, 0));
atm_flags |= EN_OBHDR;
}
if (toadd && (lastm->m_flags & M_EXT) == 0 &&
M_TRAILINGSPACE(lastm) >= toadd) {
cp = mtod(lastm, u_int8_t *) + lastm->m_len;
lastm->m_len += toadd;
mlen += toadd;
if (aal == MID_TBD_AAL5) {
bzero(cp, toadd - MID_PDU_SIZE);
dat = (u_int32_t *)(cp + toadd - MID_PDU_SIZE);
/* make sure the PDU is in proper byte order */
*dat = htonl(MID_PDU_MK1(0, 0, got));
} else {
bzero(cp, toadd);
}
atm_flags |= EN_OBTRL;
}
ATM_PH_FLAGS(ap) = atm_flags; /* update EN_OBHDR/EN_OBTRL bits */
#endif /* EN_MBUF_OPT */
/*
* get assigned channel (will be zero unless txspeed[atm_vci] is set)
*/
txchan = sc->txvc2slot[atm_vci];
if (sc->txslot[txchan].mbsize > EN_TXHIWAT) {
EN_COUNT(sc->txmbovr);
m_freem(m);
#ifdef EN_DEBUG
printf("%s: tx%d: buffer space shortage\n", sc->sc_dev.dv_xname,
txchan);
#endif
continue;
}
sc->txslot[txchan].mbsize += mlen;
#ifdef EN_DEBUG
printf("%s: tx%d: VPI=%d, VCI=%d, FLAGS=0x%x, speed=0x%x\n",
sc->sc_dev.dv_xname, txchan, atm_vpi, atm_vci, atm_flags,
sc->txspeed[atm_vci]);
printf(" adjusted mlen=%d, mbsize=%d\n", mlen,
sc->txslot[txchan].mbsize);
#endif
_IF_ENQUEUE(&sc->txslot[txchan].q, m);
en_txdma(sc, txchan);
}
/*NOTREACHED*/
}
/*
* en_mfix: fix a stupid mbuf
*/
#ifndef __FreeBSD__
STATIC int en_mfix(sc, mm, prev)
struct en_softc *sc;
struct mbuf **mm, *prev;
{
struct mbuf *m, *new;
u_char *d, *cp;
int off;
struct mbuf *nxt;
m = *mm;
EN_COUNT(sc->mfix); /* count # of calls */
#ifdef EN_DEBUG
printf("%s: mfix mbuf m_data=%p, m_len=%d\n", sc->sc_dev.dv_xname,
m->m_data, m->m_len);
#endif
d = mtod(m, u_char *);
off = ((unsigned long) d) % sizeof(u_int32_t);
if (off) {
if ((m->m_flags & M_EXT) == 0) {
bcopy(d, d - off, m->m_len); /* ALIGN! (with costly data copy...) */
d -= off;
m->m_data = (caddr_t)d;
} else {
/* can't write to an M_EXT mbuf since it may be shared */
MGET(new, M_DONTWAIT, MT_DATA);
if (!new) {
EN_COUNT(sc->mfixfail);
return(0);
}
MCLGET(new, M_DONTWAIT);
if ((new->m_flags & M_EXT) == 0) {
m_free(new);
EN_COUNT(sc->mfixfail);
return(0);
}
bcopy(d, new->m_data, m->m_len); /* ALIGN! (with costly data copy...) */
new->m_len = m->m_len;
new->m_next = m->m_next;
if (prev)
prev->m_next = new;
m_free(m);
*mm = m = new; /* note: 'd' now invalid */
}
}
off = m->m_len % sizeof(u_int32_t);
if (off == 0)
return(1);
d = mtod(m, u_char *) + m->m_len;
off = sizeof(u_int32_t) - off;
nxt = m->m_next;
while (off--) {
for ( ; nxt != NULL && nxt->m_len == 0 ; nxt = nxt->m_next)
/*null*/;
if (nxt == NULL) { /* out of data, zero fill */
*d++ = 0;
continue; /* next "off" */
}
cp = mtod(nxt, u_char *);
*d++ = *cp++;
m->m_len++;
nxt->m_len--;
nxt->m_data = (caddr_t)cp;
}
return(1);
}
#else /* __FreeBSD__ */
STATIC int en_makeexclusive(struct en_softc *, struct mbuf **, struct mbuf *);
STATIC int en_makeexclusive(sc, mm, prev)
struct en_softc *sc;
struct mbuf **mm, *prev;
{
struct mbuf *m, *new;
m = *mm;
if (m->m_flags & M_EXT) {
if (m->m_ext.ext_type != EXT_CLUSTER) {
/* external buffer isn't an ordinary mbuf cluster! */
printf("%s: mfix: special buffer! can't make a copy!\n",
sc->sc_dev.dv_xname);
return (0);
}
if (MEXT_IS_REF(m)) {
/* make a real copy of the M_EXT mbuf since it is shared */
MGET(new, M_DONTWAIT, MT_DATA);
if (!new) {
EN_COUNT(sc->mfixfail);
return(0);
}
if (m->m_flags & M_PKTHDR)
M_MOVE_PKTHDR(new, m);
MCLGET(new, M_DONTWAIT);
if ((new->m_flags & M_EXT) == 0) {
m_free(new);
EN_COUNT(sc->mfixfail);
return(0);
}
bcopy(m->m_data, new->m_data, m->m_len);
new->m_len = m->m_len;
new->m_next = m->m_next;
if (prev)
prev->m_next = new;
m_free(m);
*mm = new;
}
else {
/* the buffer is not shared, align the data offset using
this buffer. */
u_char *d = mtod(m, u_char *);
int off = ((uintptr_t)(void *)d) % sizeof(u_int32_t);
if (off > 0) {
bcopy(d, d - off, m->m_len);
m->m_data = (caddr_t)d - off;
}
}
}
return (1);
}
STATIC int en_mfix(sc, mm, prev)
struct en_softc *sc;
struct mbuf **mm, *prev;
{
struct mbuf *m;
u_char *d, *cp;
int off;
struct mbuf *nxt;
m = *mm;
EN_COUNT(sc->mfix); /* count # of calls */
#ifdef EN_DEBUG
printf("%s: mfix mbuf m_data=%p, m_len=%d\n", sc->sc_dev.dv_xname,
m->m_data, m->m_len);
#endif
d = mtod(m, u_char *);
off = ((uintptr_t) (void *) d) % sizeof(u_int32_t);
if (off) {
if ((m->m_flags & M_EXT) == 0) {
bcopy(d, d - off, m->m_len); /* ALIGN! (with costly data copy...) */
d -= off;
m->m_data = (caddr_t)d;
} else {
/* can't write to an M_EXT mbuf since it may be shared */
if (en_makeexclusive(sc, &m, prev) == 0)
return (0);
*mm = m; /* note: 'd' now invalid */
}
}
off = m->m_len % sizeof(u_int32_t);
if (off == 0)
return(1);
if (m->m_flags & M_EXT) {
/* can't write to an M_EXT mbuf since it may be shared */
if (en_makeexclusive(sc, &m, prev) == 0)
return (0);
*mm = m; /* note: 'd' now invalid */
}
d = mtod(m, u_char *) + m->m_len;
off = sizeof(u_int32_t) - off;
nxt = m->m_next;
while (off--) {
if (nxt != NULL && nxt->m_len == 0) {
/* remove an empty mbuf. this avoids odd byte padding to an empty
last mbuf. */
m->m_next = nxt = m_free(nxt);
}
if (nxt == NULL) { /* out of data, zero fill */
*d++ = 0;
continue; /* next "off" */
}
cp = mtod(nxt, u_char *);
*d++ = *cp++;
m->m_len++;
nxt->m_len--;
nxt->m_data = (caddr_t)cp;
}
if (nxt != NULL && nxt->m_len == 0)
m->m_next = m_free(nxt);
return(1);
}
#endif /* __FreeBSD__ */
/*
* en_txdma: start trasmit DMA, if possible
*/
STATIC void en_txdma(sc, chan)
struct en_softc *sc;
int chan;
{
struct mbuf *tmp;
struct atm_pseudohdr *ap;
struct en_launch launch;
int datalen = 0, dtqneed, len, ncells;
u_int8_t *cp;
struct ifnet *ifp;
#ifdef EN_DEBUG
printf("%s: tx%d: starting...\n", sc->sc_dev.dv_xname, chan);
#endif
/*
* note: now that txlaunch handles non-word aligned/sized requests
* the only time you can safely set launch.nodma is if you've en_mfix()'d
* the mbuf chain. this happens only if EN_NOTXDMA || !en_dma.
*/
launch.nodma = (EN_NOTXDMA || !en_dma);
again:
/*
* get an mbuf waiting for DMA
*/
launch.t = sc->txslot[chan].q.ifq_head; /* peek at head of queue */
if (launch.t == NULL) {
#ifdef EN_DEBUG
printf("%s: tx%d: ...done!\n", sc->sc_dev.dv_xname, chan);
#endif
return; /* >>> exit here if no data waiting for DMA <<< */
}
/*
* get flags, vci
*
* note: launch.need = # bytes we need to get on the card
* dtqneed = # of DTQs we need for this packet
* launch.mlen = # of bytes in in mbuf chain (<= launch.need)
*/
ap = mtod(launch.t, struct atm_pseudohdr *);
launch.atm_vci = ATM_PH_VCI(ap);
launch.atm_flags = ATM_PH_FLAGS(ap);
launch.aal = ((launch.atm_flags & ATM_PH_AAL5) != 0) ?
MID_TBD_AAL5 : MID_TBD_NOAAL5;
/*
* XXX: have to recompute the length again, even though we already did
* it in en_start(). might as well compute dtqneed here as well, so
* this isn't that bad.
*/
if ((launch.atm_flags & EN_OBHDR) == 0) {
dtqneed = 1; /* header still needs to be added */
launch.need = MID_TBD_SIZE; /* not includeded with mbuf */
} else {
dtqneed = 0; /* header on-board, dma with mbuf */
launch.need = 0;
}
launch.mlen = 0;
for (tmp = launch.t ; tmp != NULL ; tmp = tmp->m_next) {
len = tmp->m_len;
launch.mlen += len;
cp = mtod(tmp, u_int8_t *);
if (tmp == launch.t) {
len -= sizeof(struct atm_pseudohdr); /* don't count this! */
cp += sizeof(struct atm_pseudohdr);
}
launch.need += len;
if (len == 0)
continue; /* atm_pseudohdr alone in first mbuf */
dtqneed += en_dqneed(sc, (caddr_t) cp, len, 1);
}
if ((launch.need % sizeof(u_int32_t)) != 0)
dtqneed++; /* need DTQ to FLUSH internal buffer */
if ((launch.atm_flags & EN_OBTRL) == 0) {
if (launch.aal == MID_TBD_AAL5) {
datalen = launch.need - MID_TBD_SIZE;
launch.need += MID_PDU_SIZE; /* AAL5: need PDU tail */
}
dtqneed++; /* need to work on the end a bit */
}
/*
* finish calculation of launch.need (need to figure out how much padding
* we will need). launch.need includes MID_TBD_SIZE, but we need to
* remove that to so we can round off properly. we have to add
* MID_TBD_SIZE back in after calculating ncells.
*/
launch.need = roundup(launch.need - MID_TBD_SIZE, MID_ATMDATASZ);
ncells = launch.need / MID_ATMDATASZ;
launch.need += MID_TBD_SIZE;
if (launch.need > EN_TXSZ * 1024) {
printf("%s: tx%d: packet larger than xmit buffer (%d > %d)\n",
sc->sc_dev.dv_xname, chan, launch.need, EN_TXSZ * 1024);
goto dequeue_drop;
}
/*
* note: don't use the entire buffer space. if WRTX becomes equal
* to RDTX, the transmitter stops assuming the buffer is empty! --kjc
*/
if (launch.need >= sc->txslot[chan].bfree) {
EN_COUNT(sc->txoutspace);
#ifdef EN_DEBUG
printf("%s: tx%d: out of transmit space\n", sc->sc_dev.dv_xname, chan);
#endif
return; /* >>> exit here if out of obmem buffer space <<< */
}
/*
* ensure we have enough dtqs to go, if not, wait for more.
*/
if (launch.nodma) {
dtqneed = 1;
}
if (dtqneed > sc->dtq_free) {
sc->need_dtqs = 1;
EN_COUNT(sc->txdtqout);
#ifdef EN_DEBUG
printf("%s: tx%d: out of transmit DTQs\n", sc->sc_dev.dv_xname, chan);
#endif
return; /* >>> exit here if out of dtqs <<< */
}
/*
* it is a go, commit! dequeue mbuf start working on the xfer.
*/
_IF_DEQUEUE(&sc->txslot[chan].q, tmp);
#ifdef EN_DIAG
if (launch.t != tmp)
panic("en dequeue");
#endif /* EN_DIAG */
/*
* launch!
*/
EN_COUNT(sc->launch);
ifp = &sc->enif;
ifp->if_opackets++;
if ((launch.atm_flags & EN_OBHDR) == 0) {
EN_COUNT(sc->lheader);
/* store tbd1/tbd2 in host byte order */
launch.tbd1 = MID_TBD_MK1(launch.aal, sc->txspeed[launch.atm_vci], ncells);
launch.tbd2 = MID_TBD_MK2(launch.atm_vci, 0, 0);
}
if ((launch.atm_flags & EN_OBTRL) == 0 && launch.aal == MID_TBD_AAL5) {
EN_COUNT(sc->ltail);
launch.pdu1 = MID_PDU_MK1(0, 0, datalen); /* host byte order */
}
en_txlaunch(sc, chan, &launch);
#if NBPF > 0
if (ifp->if_bpf) {
/*
* adjust the top of the mbuf to skip the pseudo atm header
* (and TBD, if present) before passing the packet to bpf,
* restore it afterwards.
*/
int size = sizeof(struct atm_pseudohdr);
if (launch.atm_flags & EN_OBHDR)
size += MID_TBD_SIZE;
launch.t->m_data += size;
launch.t->m_len -= size;
BPF_MTAP(ifp, launch.t);
launch.t->m_data -= size;
launch.t->m_len += size;
}
#endif /* NBPF > 0 */
/*
* do some housekeeping and get the next packet
*/
sc->txslot[chan].bfree -= launch.need;
_IF_ENQUEUE(&sc->txslot[chan].indma, launch.t);
goto again;
/*
* END of txdma loop!
*/
/*
* error handles
*/
dequeue_drop:
_IF_DEQUEUE(&sc->txslot[chan].q, tmp);
if (launch.t != tmp)
panic("en dequeue drop");
m_freem(launch.t);
sc->txslot[chan].mbsize -= launch.mlen;
goto again;
}
/*
* en_txlaunch: launch an mbuf into the dma pool!
*/
STATIC void en_txlaunch(sc, chan, l)
struct en_softc *sc;
int chan;
struct en_launch *l;
{
struct mbuf *tmp;
u_int32_t cur = sc->txslot[chan].cur,
start = sc->txslot[chan].start,
stop = sc->txslot[chan].stop,
dma, *data, *datastop, count, bcode;
int pad, addtail, need, len, needalign, cnt, end, mx;
/*
* vars:
* need = # bytes card still needs (decr. to zero)
* len = # of bytes left in current mbuf
* cur = our current pointer
* dma = last place we programmed into the DMA
* data = pointer into data area of mbuf that needs to go next
* cnt = # of bytes to transfer in this DTQ
* bcode/count = DMA burst code, and chip's version of cnt
*
* a single buffer can require up to 5 DTQs depending on its size
* and alignment requirements. the 5 possible requests are:
* [1] 1, 2, or 3 byte DMA to align src data pointer to word boundary
* [2] alburst DMA to align src data pointer to bestburstlen
* [3] 1 or more bestburstlen DMAs
* [4] clean up burst (to last word boundary)
* [5] 1, 2, or 3 byte final clean up DMA
*/
need = l->need;
dma = cur;
addtail = (l->atm_flags & EN_OBTRL) == 0; /* add a tail? */
#ifdef EN_DIAG
if ((need - MID_TBD_SIZE) % MID_ATMDATASZ)
printf("%s: tx%d: bogus trasmit needs (%d)\n", sc->sc_dev.dv_xname, chan,
need);
#endif
#ifdef EN_DEBUG
printf("%s: tx%d: launch mbuf %p! cur=0x%x[%d], need=%d, addtail=%d\n",
sc->sc_dev.dv_xname, chan, l->t, cur, (cur-start)/4, need, addtail);
count = EN_READ(sc, MIDX_PLACE(chan));
printf(" HW: base_address=0x%x, size=%d, read=%d, descstart=%d\n",
(u_int)MIDX_BASE(count), MIDX_SZ(count),
(int)EN_READ(sc, MIDX_READPTR(chan)),
(int)EN_READ(sc, MIDX_DESCSTART(chan)));
#endif
/*
* do we need to insert the TBD by hand?
* note that tbd1/tbd2/pdu1 are in host byte order.
*/
if ((l->atm_flags & EN_OBHDR) == 0) {
#ifdef EN_DEBUG
printf("%s: tx%d: insert header 0x%x 0x%x\n", sc->sc_dev.dv_xname,
chan, l->tbd1, l->tbd2);
#endif
EN_WRITE(sc, cur, l->tbd1);
EN_WRAPADD(start, stop, cur, 4);
EN_WRITE(sc, cur, l->tbd2);
EN_WRAPADD(start, stop, cur, 4);
need -= 8;
}
/*
* now do the mbufs...
*/
for (tmp = l->t ; tmp != NULL ; tmp = tmp->m_next) {
/* get pointer to data and length */
data = mtod(tmp, u_int32_t *);
len = tmp->m_len;
if (tmp == l->t) {
data += sizeof(struct atm_pseudohdr)/sizeof(u_int32_t);
len -= sizeof(struct atm_pseudohdr);
}
/* now, determine if we should copy it */
if (l->nodma || (len < EN_MINDMA &&
(len % 4) == 0 && ((uintptr_t) (void *) data % 4) == 0 &&
(cur % 4) == 0)) {
/*
* roundup len: the only time this will change the value of len
* is when l->nodma is true, tmp is the last mbuf, and there is
* a non-word number of bytes to transmit. in this case it is
* safe to round up because we've en_mfix'd the mbuf (so the first
* byte is word aligned there must be enough free bytes at the end
* to round off to the next word boundary)...
*/
len = roundup(len, sizeof(u_int32_t));
datastop = data + (len / sizeof(u_int32_t));
/* copy loop: preserve byte order!!! use WRITEDAT */
while (data != datastop) {
EN_WRITEDAT(sc, cur, *data);
data++;
EN_WRAPADD(start, stop, cur, 4);
}
need -= len;
#ifdef EN_DEBUG
printf("%s: tx%d: copied %d bytes (%d left, cur now 0x%x)\n",
sc->sc_dev.dv_xname, chan, len, need, cur);
#endif
continue; /* continue on to next mbuf */
}
/* going to do DMA, first make sure the dtq is in sync. */
if (dma != cur) {
EN_DTQADD(sc, WORD_IDX(start,cur), chan, MIDDMA_JK, 0, 0, 0);
#ifdef EN_DEBUG
printf("%s: tx%d: dtq_sync: advance pointer to %d\n",
sc->sc_dev.dv_xname, chan, cur);
#endif
}
/*
* if this is the last buffer, and it looks like we are going to need to
* flush the internal buffer, can we extend the length of this mbuf to
* avoid the FLUSH?
*/
if (tmp->m_next == NULL) {
cnt = (need - len) % sizeof(u_int32_t);
if (cnt && M_TRAILINGSPACE(tmp) >= cnt)
len += cnt; /* pad for FLUSH */
}
#if !defined(MIDWAY_ENIONLY)
/*
* the adaptec DMA engine is smart and handles everything for us.
*/
if (sc->is_adaptec) {
/* need to DMA "len" bytes out to card */
need -= len;
EN_WRAPADD(start, stop, cur, len);
#ifdef EN_DEBUG
printf("%s: tx%d: adp_dma %d bytes (%d left, cur now 0x%x)\n",
sc->sc_dev.dv_xname, chan, len, need, cur);
#endif
end = (need == 0) ? MID_DMA_END : 0;
EN_DTQADD(sc, len, chan, 0, vtophys(data), l->mlen, end);
if (end)
goto done;
dma = cur; /* update dma pointer */
continue;
}
#endif /* !MIDWAY_ENIONLY */
#if !defined(MIDWAY_ADPONLY)
/*
* the ENI DMA engine is not so smart and need more help from us
*/
/* do we need to do a DMA op to align to word boundary? */
needalign = (uintptr_t) (void *) data % sizeof(u_int32_t);
if (needalign) {
EN_COUNT(sc->headbyte);
cnt = sizeof(u_int32_t) - needalign;
if (cnt == 2 && len >= cnt) {
count = 1;
bcode = MIDDMA_2BYTE;
} else {
cnt = min(cnt, len); /* prevent overflow */
count = cnt;
bcode = MIDDMA_BYTE;
}
need -= cnt;
EN_WRAPADD(start, stop, cur, cnt);
#ifdef EN_DEBUG
printf("%s: tx%d: small al_dma %d bytes (%d left, cur now 0x%x)\n",
sc->sc_dev.dv_xname, chan, cnt, need, cur);
#endif
len -= cnt;
end = (need == 0) ? MID_DMA_END : 0;
EN_DTQADD(sc, count, chan, bcode, vtophys(data), l->mlen, end);
if (end)
goto done;
data = (u_int32_t *) ((u_char *)data + cnt);
}
/* do we need to do a DMA op to align? */
if (sc->alburst &&
(needalign = (((uintptr_t) (void *) data) & sc->bestburstmask)) != 0
&& len >= sizeof(u_int32_t)) {
cnt = sc->bestburstlen - needalign;
mx = len & ~(sizeof(u_int32_t)-1); /* don't go past end */
if (cnt > mx) {
cnt = mx;
count = cnt / sizeof(u_int32_t);
bcode = MIDDMA_WORD;
} else {
count = cnt / sizeof(u_int32_t);
bcode = en_dmaplan[count].bcode;
count = cnt >> en_dmaplan[count].divshift;
}
need -= cnt;
EN_WRAPADD(start, stop, cur, cnt);
#ifdef EN_DEBUG
printf("%s: tx%d: al_dma %d bytes (%d left, cur now 0x%x)\n",
sc->sc_dev.dv_xname, chan, cnt, need, cur);
#endif
len -= cnt;
end = (need == 0) ? MID_DMA_END : 0;
EN_DTQADD(sc, count, chan, bcode, vtophys(data), l->mlen, end);
if (end)
goto done;
data = (u_int32_t *) ((u_char *)data + cnt);
}
/* do we need to do a max-sized burst? */
if (len >= sc->bestburstlen) {
count = len >> sc->bestburstshift;
cnt = count << sc->bestburstshift;
bcode = sc->bestburstcode;
need -= cnt;
EN_WRAPADD(start, stop, cur, cnt);
#ifdef EN_DEBUG
printf("%s: tx%d: best_dma %d bytes (%d left, cur now 0x%x)\n",
sc->sc_dev.dv_xname, chan, cnt, need, cur);
#endif
len -= cnt;
end = (need == 0) ? MID_DMA_END : 0;
EN_DTQADD(sc, count, chan, bcode, vtophys(data), l->mlen, end);
if (end)
goto done;
data = (u_int32_t *) ((u_char *)data + cnt);
}
/* do we need to do a cleanup burst? */
cnt = len & ~(sizeof(u_int32_t)-1);
if (cnt) {
count = cnt / sizeof(u_int32_t);
bcode = en_dmaplan[count].bcode;
count = cnt >> en_dmaplan[count].divshift;
need -= cnt;
EN_WRAPADD(start, stop, cur, cnt);
#ifdef EN_DEBUG
printf("%s: tx%d: cleanup_dma %d bytes (%d left, cur now 0x%x)\n",
sc->sc_dev.dv_xname, chan, cnt, need, cur);
#endif
len -= cnt;
end = (need == 0) ? MID_DMA_END : 0;
EN_DTQADD(sc, count, chan, bcode, vtophys(data), l->mlen, end);
if (end)
goto done;
data = (u_int32_t *) ((u_char *)data + cnt);
}
/* any word fragments left? */
if (len) {
EN_COUNT(sc->tailbyte);
if (len == 2) {
count = 1;
bcode = MIDDMA_2BYTE; /* use 2byte mode */
} else {
count = len;
bcode = MIDDMA_BYTE; /* use 1 byte mode */
}
need -= len;
EN_WRAPADD(start, stop, cur, len);
#ifdef EN_DEBUG
printf("%s: tx%d: byte cleanup_dma %d bytes (%d left, cur now 0x%x)\n",
sc->sc_dev.dv_xname, chan, len, need, cur);
#endif
end = (need == 0) ? MID_DMA_END : 0;
EN_DTQADD(sc, count, chan, bcode, vtophys(data), l->mlen, end);
if (end)
goto done;
}
dma = cur; /* update dma pointer */
#endif /* !MIDWAY_ADPONLY */
} /* next mbuf, please */
/*
* all mbuf data has been copied out to the obmem (or set up to be DMAd).
* if the trailer or padding needs to be put in, do it now.
*
* NOTE: experimental results reveal the following fact:
* if you DMA "X" bytes to the card, where X is not a multiple of 4,
* then the card will internally buffer the last (X % 4) bytes (in
* hopes of getting (4 - (X % 4)) more bytes to make a complete word).
* it is imporant to make sure we don't leave any important data in
* this internal buffer because it is discarded on the last (end) DTQ.
* one way to do this is to DMA in (4 - (X % 4)) more bytes to flush
* the darn thing out.
*/
if (addtail) {
pad = need % sizeof(u_int32_t);
if (pad) {
/*
* FLUSH internal data buffer. pad out with random data from the front
* of the mbuf chain...
*/
bcode = (sc->is_adaptec) ? 0 : MIDDMA_BYTE;
EN_COUNT(sc->tailflush);
EN_WRAPADD(start, stop, cur, pad);
EN_DTQADD(sc, pad, chan, bcode, vtophys(l->t->m_data), 0, 0);
need -= pad;
#ifdef EN_DEBUG
printf("%s: tx%d: pad/FLUSH dma %d bytes (%d left, cur now 0x%x)\n",
sc->sc_dev.dv_xname, chan, pad, need, cur);
#endif
}
/* copy data */
pad = need / sizeof(u_int32_t); /* round *down* */
if (l->aal == MID_TBD_AAL5)
pad -= 2;
#ifdef EN_DEBUG
printf("%s: tx%d: padding %d bytes (cur now 0x%x)\n",
sc->sc_dev.dv_xname, chan, (int)(pad * sizeof(u_int32_t)), cur);
#endif
while (pad--) {
EN_WRITEDAT(sc, cur, 0); /* no byte order issues with zero */
EN_WRAPADD(start, stop, cur, 4);
}
if (l->aal == MID_TBD_AAL5) {
EN_WRITE(sc, cur, l->pdu1); /* in host byte order */
EN_WRAPADD(start, stop, cur, 8);
}
}
if (addtail || dma != cur) {
/* write final descritor */
EN_DTQADD(sc, WORD_IDX(start,cur), chan, MIDDMA_JK, 0,
l->mlen, MID_DMA_END);
/* dma = cur; */ /* not necessary since we are done */
}
done:
/* update current pointer */
sc->txslot[chan].cur = cur;
#ifdef EN_DEBUG
printf("%s: tx%d: DONE! cur now = 0x%x\n",
sc->sc_dev.dv_xname, chan, cur);
#endif
return;
}
/*
* interrupt handler
*/
EN_INTR_TYPE en_intr(arg)
void *arg;
{
struct en_softc *sc = (struct en_softc *) arg;
struct mbuf *m;
struct atm_pseudohdr ah;
struct ifnet *ifp;
u_int32_t reg, kick, val, mask, chip, vci, slot, dtq, drq;
int lcv, idx, need_softserv = 0;
reg = EN_READ(sc, MID_INTACK);
if ((reg & MID_INT_ANY) == 0)
EN_INTR_RET(0); /* not us */
#ifdef EN_DEBUG
printf("%s: interrupt=0x%b\n", sc->sc_dev.dv_xname, reg, MID_INTBITS);
#endif
/*
* unexpected errors that need a reset
*/
if ((reg & (MID_INT_IDENT|MID_INT_LERR|MID_INT_DMA_ERR|MID_INT_SUNI)) != 0) {
printf("%s: unexpected interrupt=0x%b, resetting card\n",
sc->sc_dev.dv_xname, reg, MID_INTBITS);
#ifdef EN_DEBUG
#ifdef DDB
#ifdef __FreeBSD__
Debugger("en: unexpected error");
#else
Debugger();
#endif
#endif /* DDB */
sc->enif.if_flags &= ~IFF_RUNNING; /* FREEZE! */
#else
en_reset(sc);
en_init(sc);
#endif
EN_INTR_RET(1); /* for us */
}
/*******************
* xmit interrupts *
******************/
kick = 0; /* bitmask of channels to kick */
if (reg & MID_INT_TX) { /* TX done! */
/*
* check for tx complete, if detected then this means that some space
* has come free on the card. we must account for it and arrange to
* kick the channel to life (in case it is stalled waiting on the card).
*/
for (mask = 1, lcv = 0 ; lcv < EN_NTX ; lcv++, mask = mask * 2) {
if (reg & MID_TXCHAN(lcv)) {
kick = kick | mask; /* want to kick later */
val = EN_READ(sc, MIDX_READPTR(lcv)); /* current read pointer */
val = (val * sizeof(u_int32_t)) + sc->txslot[lcv].start;
/* convert to offset */
if (val > sc->txslot[lcv].cur)
sc->txslot[lcv].bfree = val - sc->txslot[lcv].cur;
else
sc->txslot[lcv].bfree = (val + (EN_TXSZ*1024)) - sc->txslot[lcv].cur;
#ifdef EN_DEBUG
printf("%s: tx%d: trasmit done. %d bytes now free in buffer\n",
sc->sc_dev.dv_xname, lcv, sc->txslot[lcv].bfree);
#endif
}
}
}
if (reg & MID_INT_DMA_TX) { /* TX DMA done! */
/*
* check for TX DMA complete, if detected then this means that some DTQs
* are now free. it also means some indma mbufs can be freed.
* if we needed DTQs, kick all channels.
*/
val = EN_READ(sc, MID_DMA_RDTX); /* chip's current location */
idx = MID_DTQ_A2REG(sc->dtq_chip);/* where we last saw chip */
if (sc->need_dtqs) {
kick = MID_NTX_CH - 1; /* assume power of 2, kick all! */
sc->need_dtqs = 0; /* recalculated in "kick" loop below */
#ifdef EN_DEBUG
printf("%s: cleared need DTQ condition\n", sc->sc_dev.dv_xname);
#endif
}
while (idx != val) {
sc->dtq_free++;
if ((dtq = sc->dtq[idx]) != 0) {
sc->dtq[idx] = 0; /* don't forget to zero it out when done */
slot = EN_DQ_SLOT(dtq);
_IF_DEQUEUE(&sc->txslot[slot].indma, m);
if (!m) panic("enintr: dtqsync");
sc->txslot[slot].mbsize -= EN_DQ_LEN(dtq);
#ifdef EN_DEBUG
printf("%s: tx%d: free %d dma bytes, mbsize now %d\n",
sc->sc_dev.dv_xname, slot, EN_DQ_LEN(dtq),
sc->txslot[slot].mbsize);
#endif
m_freem(m);
}
EN_WRAPADD(0, MID_DTQ_N, idx, 1);
};
sc->dtq_chip = MID_DTQ_REG2A(val); /* sync softc */
}
/*
* kick xmit channels as needed
*/
if (kick) {
#ifdef EN_DEBUG
printf("%s: tx kick mask = 0x%x\n", sc->sc_dev.dv_xname, kick);
#endif
for (mask = 1, lcv = 0 ; lcv < EN_NTX ; lcv++, mask = mask * 2) {
if ((kick & mask) && sc->txslot[lcv].q.ifq_head) {
en_txdma(sc, lcv); /* kick it! */
}
} /* for each slot */
} /* if kick */
/*******************
* recv interrupts *
******************/
/*
* check for RX DMA complete, and pass the data "upstairs"
*/
if (reg & MID_INT_DMA_RX) {
val = EN_READ(sc, MID_DMA_RDRX); /* chip's current location */
idx = MID_DRQ_A2REG(sc->drq_chip);/* where we last saw chip */
while (idx != val) {
sc->drq_free++;
if ((drq = sc->drq[idx]) != 0) {
sc->drq[idx] = 0; /* don't forget to zero it out when done */
slot = EN_DQ_SLOT(drq);
if (EN_DQ_LEN(drq) == 0) { /* "JK" trash DMA? */
m = NULL;
} else {
_IF_DEQUEUE(&sc->rxslot[slot].indma, m);
if (!m)
panic("enintr: drqsync: %s: lost mbuf in slot %d!",
sc->sc_dev.dv_xname, slot);
}
/* do something with this mbuf */
if (sc->rxslot[slot].oth_flags & ENOTHER_DRAIN) { /* drain? */
if (m)
m_freem(m);
vci = sc->rxslot[slot].atm_vci;
if (sc->rxslot[slot].indma.ifq_head == NULL &&
sc->rxslot[slot].q.ifq_head == NULL &&
(EN_READ(sc, MID_VC(vci)) & MIDV_INSERVICE) == 0 &&
(sc->rxslot[slot].oth_flags & ENOTHER_SWSL) == 0) {
sc->rxslot[slot].oth_flags = ENOTHER_FREE; /* done drain */
sc->rxslot[slot].atm_vci = RX_NONE;
sc->rxvc2slot[vci] = RX_NONE;
#ifdef EN_DEBUG
printf("%s: rx%d: VCI %d now free\n", sc->sc_dev.dv_xname,
slot, vci);
#endif
}
} else if (m != NULL) {
ATM_PH_FLAGS(&ah) = sc->rxslot[slot].atm_flags;
ATM_PH_VPI(&ah) = 0;
ATM_PH_SETVCI(&ah, sc->rxslot[slot].atm_vci);
#ifdef EN_DEBUG
printf("%s: rx%d: rxvci%d: atm_input, mbuf %p, len %d, hand %p\n",
sc->sc_dev.dv_xname, slot, sc->rxslot[slot].atm_vci, m,
EN_DQ_LEN(drq), sc->rxslot[slot].rxhand);
#endif
ifp = &sc->enif;
ifp->if_ipackets++;
#if NBPF > 0
if (ifp->if_bpf)
BPF_MTAP(ifp, m);
#endif
atm_input(ifp, &ah, m, sc->rxslot[slot].rxhand);
}
}
EN_WRAPADD(0, MID_DRQ_N, idx, 1);
};
sc->drq_chip = MID_DRQ_REG2A(val); /* sync softc */
if (sc->need_drqs) { /* true if we had a DRQ shortage */
need_softserv = 1;
sc->need_drqs = 0;
#ifdef EN_DEBUG
printf("%s: cleared need DRQ condition\n", sc->sc_dev.dv_xname);
#endif
}
}
/*
* handle service interrupts
*/
if (reg & MID_INT_SERVICE) {
chip = MID_SL_REG2A(EN_READ(sc, MID_SERV_WRITE));
while (sc->hwslistp != chip) {
/* fetch and remove it from hardware service list */
vci = EN_READ(sc, sc->hwslistp);
EN_WRAPADD(MID_SLOFF, MID_SLEND, sc->hwslistp, 4);/* advance hw ptr */
slot = sc->rxvc2slot[vci];
if (slot == RX_NONE) {
#ifdef EN_DEBUG
printf("%s: unexpected rx interrupt on VCI %d\n",
sc->sc_dev.dv_xname, vci);
#endif
EN_WRITE(sc, MID_VC(vci), MIDV_TRASH); /* rx off, damn it! */
continue; /* next */
}
EN_WRITE(sc, MID_VC(vci), sc->rxslot[slot].mode); /* remove from hwsl */
EN_COUNT(sc->hwpull);
#ifdef EN_DEBUG
printf("%s: pulled VCI %d off hwslist\n", sc->sc_dev.dv_xname, vci);
#endif
/* add it to the software service list (if needed) */
if ((sc->rxslot[slot].oth_flags & ENOTHER_SWSL) == 0) {
EN_COUNT(sc->swadd);
need_softserv = 1;
sc->rxslot[slot].oth_flags |= ENOTHER_SWSL;
sc->swslist[sc->swsl_tail] = slot;
EN_WRAPADD(0, MID_SL_N, sc->swsl_tail, 1);
sc->swsl_size++;
#ifdef EN_DEBUG
printf("%s: added VCI %d to swslist\n", sc->sc_dev.dv_xname, vci);
#endif
}
};
}
/*
* now service (function too big to include here)
*/
if (need_softserv)
en_service(sc);
/*
* keep our stats
*/
if (reg & MID_INT_DMA_OVR) {
EN_COUNT(sc->dmaovr);
#ifdef EN_DEBUG
printf("%s: MID_INT_DMA_OVR\n", sc->sc_dev.dv_xname);
#endif
}
reg = EN_READ(sc, MID_STAT);
#ifdef EN_STAT
sc->otrash += MID_OTRASH(reg);
sc->vtrash += MID_VTRASH(reg);
#endif
EN_INTR_RET(1); /* for us */
}
/*
* en_service: handle a service interrupt
*
* Q: why do we need a software service list?
*
* A: if we remove a VCI from the hardware list and we find that we are
* out of DRQs we must defer processing until some DRQs become free.
* so we must remember to look at this RX VCI/slot later, but we can't
* put it back on the hardware service list (since that isn't allowed).
* so we instead save it on the software service list. it would be nice
* if we could peek at the VCI on top of the hwservice list without removing
* it, however this leads to a race condition: if we peek at it and
* decide we are done with it new data could come in before we have a
* chance to remove it from the hwslist. by the time we get it out of
* the list the interrupt for the new data will be lost. oops!
*
*/
STATIC void en_service(sc)
struct en_softc *sc;
{
struct mbuf *m, *tmp;
u_int32_t cur, dstart, rbd, pdu, *sav, dma, bcode, count, *data, *datastop;
u_int32_t start, stop, cnt, needalign;
int slot, raw, aal5, llc, vci, fill, mlen, tlen, drqneed, need, needfill, end;
aal5 = 0; /* Silence gcc */
next_vci:
if (sc->swsl_size == 0) {
#ifdef EN_DEBUG
printf("%s: en_service done\n", sc->sc_dev.dv_xname);
#endif
return; /* >>> exit here if swsl now empty <<< */
}
/*
* get slot/vci to service
*/
slot = sc->swslist[sc->swsl_head];
vci = sc->rxslot[slot].atm_vci;
#ifdef EN_DIAG
if (sc->rxvc2slot[vci] != slot) panic("en_service rx slot/vci sync");
#endif
/*
* determine our mode and if we've got any work to do
*/
raw = sc->rxslot[slot].oth_flags & ENOTHER_RAW;
start= sc->rxslot[slot].start;
stop= sc->rxslot[slot].stop;
cur = sc->rxslot[slot].cur;
#ifdef EN_DEBUG
printf("%s: rx%d: service vci=%d raw=%d start/stop/cur=0x%x 0x%x 0x%x\n",
sc->sc_dev.dv_xname, slot, vci, raw, start, stop, cur);
#endif
same_vci:
dstart = MIDV_DSTART(EN_READ(sc, MID_DST_RP(vci)));
dstart = (dstart * sizeof(u_int32_t)) + start;
/* check to see if there is any data at all */
if (dstart == cur) {
defer: /* defer processing */
EN_WRAPADD(0, MID_SL_N, sc->swsl_head, 1);
sc->rxslot[slot].oth_flags &= ~ENOTHER_SWSL;
sc->swsl_size--;
/* >>> remove from swslist <<< */
#ifdef EN_DEBUG
printf("%s: rx%d: remove vci %d from swslist\n",
sc->sc_dev.dv_xname, slot, vci);
#endif
goto next_vci;
}
/*
* figure out how many bytes we need
* [mlen = # bytes to go in mbufs, fill = # bytes to dump (MIDDMA_JK)]
*/
if (raw) {
/* raw mode (aka boodi mode) */
fill = 0;
if (dstart > cur)
mlen = dstart - cur;
else
mlen = (dstart + (EN_RXSZ*1024)) - cur;
if (mlen < sc->rxslot[slot].raw_threshold)
goto defer; /* too little data to deal with */
} else {
/* normal mode */
aal5 = (sc->rxslot[slot].atm_flags & ATM_PH_AAL5);
llc = (aal5 && (sc->rxslot[slot].atm_flags & ATM_PH_LLCSNAP)) ? 1 : 0;
rbd = EN_READ(sc, cur);
if (MID_RBD_ID(rbd) != MID_RBD_STDID)
panic("en_service: id mismatch");
if (rbd & MID_RBD_T) {
mlen = 0; /* we've got trash */
fill = MID_RBD_SIZE;
EN_COUNT(sc->ttrash);
#ifdef EN_DEBUG
printf("RX overflow lost %d cells!\n", MID_RBD_CNT(rbd));
#endif
} else if (!aal5) {
mlen = MID_RBD_SIZE + MID_CHDR_SIZE + MID_ATMDATASZ; /* 1 cell (ick!) */
fill = 0;
} else {
struct ifnet *ifp;
tlen = (MID_RBD_CNT(rbd) * MID_ATMDATASZ) + MID_RBD_SIZE;
pdu = cur + tlen - MID_PDU_SIZE;
if (pdu >= stop)
pdu -= (EN_RXSZ*1024);
pdu = EN_READ(sc, pdu); /* get PDU in correct byte order */
fill = tlen - MID_RBD_SIZE - MID_PDU_LEN(pdu);
if (fill < 0 || (rbd & MID_RBD_CRCERR) != 0) {
static int first = 1;
if (first) {
printf("%s: %s, dropping frame\n", sc->sc_dev.dv_xname,
(rbd & MID_RBD_CRCERR) ?
"CRC error" : "invalid AAL5 PDU length");
printf("%s: got %d cells (%d bytes), AAL5 len is %d bytes (pdu=0x%x)\n",
sc->sc_dev.dv_xname, MID_RBD_CNT(rbd),
tlen - MID_RBD_SIZE, MID_PDU_LEN(pdu), pdu);
#ifndef EN_DEBUG
printf("CRC error report disabled from now on!\n");
first = 0;
#endif
}
fill = tlen;
ifp = &sc->enif;
ifp->if_ierrors++;
}
mlen = tlen - fill;
}
}
/*
* now allocate mbufs for mlen bytes of data, if out of mbufs, trash all
*
* notes:
* 1. it is possible that we've already allocated an mbuf for this pkt
* but ran out of DRQs, in which case we saved the allocated mbuf on
* "q".
* 2. if we save an mbuf in "q" we store the "cur" (pointer) in the front
* of the mbuf as an identity (that we can check later), and we also
* store drqneed (so we don't have to recompute it).
* 3. after this block of code, if m is still NULL then we ran out of mbufs
*/
m = sc->rxslot[slot].q.ifq_head;
drqneed = 1;
if (m) {
sav = mtod(m, u_int32_t *);
if (sav[0] != cur) {
#ifdef EN_DEBUG
printf("%s: rx%d: q'ed mbuf %p not ours\n",
sc->sc_dev.dv_xname, slot, m);
#endif
m = NULL; /* wasn't ours */
EN_COUNT(sc->rxqnotus);
} else {
EN_COUNT(sc->rxqus);
_IF_DEQUEUE(&sc->rxslot[slot].q, m);
drqneed = sav[1];
#ifdef EN_DEBUG
printf("%s: rx%d: recovered q'ed mbuf %p (drqneed=%d)\n",
sc->sc_dev.dv_xname, slot, m, drqneed);
#endif
}
}
if (mlen != 0 && m == NULL) {
m = en_mget(sc, mlen, &drqneed); /* allocate! */
if (m == NULL) {
fill += mlen;
mlen = 0;
EN_COUNT(sc->rxmbufout);
#ifdef EN_DEBUG
printf("%s: rx%d: out of mbufs\n", sc->sc_dev.dv_xname, slot);
#endif
}
#ifdef EN_DEBUG
printf("%s: rx%d: allocate mbuf %p, mlen=%d, drqneed=%d\n",
sc->sc_dev.dv_xname, slot, m, mlen, drqneed);
#endif
}
#ifdef EN_DEBUG
printf("%s: rx%d: VCI %d, mbuf_chain %p, mlen %d, fill %d\n",
sc->sc_dev.dv_xname, slot, vci, m, mlen, fill);
#endif
/*
* now check to see if we've got the DRQs needed. if we are out of
* DRQs we must quit (saving our mbuf, if we've got one).
*/
needfill = (fill) ? 1 : 0;
if (drqneed + needfill > sc->drq_free) {
sc->need_drqs = 1; /* flag condition */
if (m == NULL) {
EN_COUNT(sc->rxoutboth);
#ifdef EN_DEBUG
printf("%s: rx%d: out of DRQs *and* mbufs!\n", sc->sc_dev.dv_xname, slot);
#endif
return; /* >>> exit here if out of both mbufs and DRQs <<< */
}
sav = mtod(m, u_int32_t *);
sav[0] = cur;
sav[1] = drqneed;
_IF_ENQUEUE(&sc->rxslot[slot].q, m);
EN_COUNT(sc->rxdrqout);
#ifdef EN_DEBUG
printf("%s: rx%d: out of DRQs\n", sc->sc_dev.dv_xname, slot);
#endif
return; /* >>> exit here if out of DRQs <<< */
}
/*
* at this point all resources have been allocated and we are commited
* to servicing this slot.
*
* dma = last location we told chip about
* cur = current location
* mlen = space in the mbuf we want
* need = bytes to xfer in (decrs to zero)
* fill = how much fill we need
* tlen = how much data to transfer to this mbuf
* cnt/bcode/count = <same as xmit>
*
* 'needfill' not used after this point
*/
dma = cur; /* dma = last location we told chip about */
need = roundup(mlen, sizeof(u_int32_t));
fill = fill - (need - mlen); /* note: may invalidate 'needfill' */
for (tmp = m ; tmp != NULL && need > 0 ; tmp = tmp->m_next) {
tlen = roundup(tmp->m_len, sizeof(u_int32_t)); /* m_len set by en_mget */
data = mtod(tmp, u_int32_t *);
#ifdef EN_DEBUG
printf("%s: rx%d: load mbuf %p, m_len=%d, m_data=%p, tlen=%d\n",
sc->sc_dev.dv_xname, slot, tmp, tmp->m_len, tmp->m_data, tlen);
#endif
/* copy data */
if (EN_NORXDMA || !en_dma || tlen < EN_MINDMA) {
datastop = (u_int32_t *)((u_char *) data + tlen);
/* copy loop: preserve byte order!!! use READDAT */
while (data != datastop) {
*data = EN_READDAT(sc, cur);
data++;
EN_WRAPADD(start, stop, cur, 4);
}
need -= tlen;
#ifdef EN_DEBUG
printf("%s: rx%d: vci%d: copied %d bytes (%d left)\n",
sc->sc_dev.dv_xname, slot, vci, tlen, need);
#endif
continue;
}
/* DMA data (check to see if we need to sync DRQ first) */
if (dma != cur) {
EN_DRQADD(sc, WORD_IDX(start,cur), vci, MIDDMA_JK, 0, 0, 0, 0);
#ifdef EN_DEBUG
printf("%s: rx%d: vci%d: drq_sync: advance pointer to %d\n",
sc->sc_dev.dv_xname, slot, vci, cur);
#endif
}
#if !defined(MIDWAY_ENIONLY)
/*
* the adaptec DMA engine is smart and handles everything for us.
*/
if (sc->is_adaptec) {
need -= tlen;
EN_WRAPADD(start, stop, cur, tlen);
#ifdef EN_DEBUG
printf("%s: rx%d: vci%d: adp_dma %d bytes (%d left)\n",
sc->sc_dev.dv_xname, slot, vci, tlen, need);
#endif
end = (need == 0 && !fill) ? MID_DMA_END : 0;
EN_DRQADD(sc, tlen, vci, 0, vtophys(data), mlen, slot, end);
if (end)
goto done;
dma = cur; /* update dma pointer */
continue;
}
#endif /* !MIDWAY_ENIONLY */
#if !defined(MIDWAY_ADPONLY)
/*
* the ENI DMA engine is not so smart and need more help from us
*/
/* do we need to do a DMA op to align? */
if (sc->alburst &&
(needalign = (((uintptr_t) (void *) data) & sc->bestburstmask)) != 0) {
cnt = sc->bestburstlen - needalign;
if (cnt > tlen) {
cnt = tlen;
count = cnt / sizeof(u_int32_t);
bcode = MIDDMA_WORD;
} else {
count = cnt / sizeof(u_int32_t);
bcode = en_dmaplan[count].bcode;
count = cnt >> en_dmaplan[count].divshift;
}
need -= cnt;
EN_WRAPADD(start, stop, cur, cnt);
#ifdef EN_DEBUG
printf("%s: rx%d: vci%d: al_dma %d bytes (%d left)\n",
sc->sc_dev.dv_xname, slot, vci, cnt, need);
#endif
tlen -= cnt;
end = (need == 0 && !fill) ? MID_DMA_END : 0;
EN_DRQADD(sc, count, vci, bcode, vtophys(data), mlen, slot, end);
if (end)
goto done;
data = (u_int32_t *)((u_char *) data + cnt);
}
/* do we need a max-sized burst? */
if (tlen >= sc->bestburstlen) {
count = tlen >> sc->bestburstshift;
cnt = count << sc->bestburstshift;
bcode = sc->bestburstcode;
need -= cnt;
EN_WRAPADD(start, stop, cur, cnt);
#ifdef EN_DEBUG
printf("%s: rx%d: vci%d: best_dma %d bytes (%d left)\n",
sc->sc_dev.dv_xname, slot, vci, cnt, need);
#endif
tlen -= cnt;
end = (need == 0 && !fill) ? MID_DMA_END : 0;
EN_DRQADD(sc, count, vci, bcode, vtophys(data), mlen, slot, end);
if (end)
goto done;
data = (u_int32_t *)((u_char *) data + cnt);
}
/* do we need to do a cleanup burst? */
if (tlen) {
count = tlen / sizeof(u_int32_t);
bcode = en_dmaplan[count].bcode;
count = tlen >> en_dmaplan[count].divshift;
need -= tlen;
EN_WRAPADD(start, stop, cur, tlen);
#ifdef EN_DEBUG
printf("%s: rx%d: vci%d: cleanup_dma %d bytes (%d left)\n",
sc->sc_dev.dv_xname, slot, vci, tlen, need);
#endif
end = (need == 0 && !fill) ? MID_DMA_END : 0;
EN_DRQADD(sc, count, vci, bcode, vtophys(data), mlen, slot, end);
if (end)
goto done;
}
dma = cur; /* update dma pointer */
#endif /* !MIDWAY_ADPONLY */
}
/* skip the end */
if (fill || dma != cur) {
#ifdef EN_DEBUG
if (fill)
printf("%s: rx%d: vci%d: skipping %d bytes of fill\n",
sc->sc_dev.dv_xname, slot, vci, fill);
else
printf("%s: rx%d: vci%d: syncing chip from 0x%x to 0x%x [cur]\n",
sc->sc_dev.dv_xname, slot, vci, dma, cur);
#endif
EN_WRAPADD(start, stop, cur, fill);
EN_DRQADD(sc, WORD_IDX(start,cur), vci, MIDDMA_JK, 0, mlen,
slot, MID_DMA_END);
/* dma = cur; */ /* not necessary since we are done */
}
/*
* done, remove stuff we don't want to pass up:
* raw mode (boodi mode): pass everything up for later processing
* aal5: remove RBD
* aal0: remove RBD + cell header
*/
done:
if (m) {
if (!raw) {
cnt = MID_RBD_SIZE;
if (!aal5) cnt += MID_CHDR_SIZE;
m->m_len -= cnt; /* chop! */
m->m_pkthdr.len -= cnt;
m->m_data += cnt;
}
_IF_ENQUEUE(&sc->rxslot[slot].indma, m);
}
sc->rxslot[slot].cur = cur; /* update master copy of 'cur' */
#ifdef EN_DEBUG
printf("%s: rx%d: vci%d: DONE! cur now =0x%x\n",
sc->sc_dev.dv_xname, slot, vci, cur);
#endif
goto same_vci; /* get next packet in this slot */
}
#ifdef EN_DDBHOOK
/*
* functions we can call from ddb
*/
/*
* en_dump: dump the state
*/
#define END_SWSL 0x00000040 /* swsl state */
#define END_DRQ 0x00000020 /* drq state */
#define END_DTQ 0x00000010 /* dtq state */
#define END_RX 0x00000008 /* rx state */
#define END_TX 0x00000004 /* tx state */
#define END_MREGS 0x00000002 /* registers */
#define END_STATS 0x00000001 /* dump stats */
#define END_BITS "\20\7SWSL\6DRQ\5DTQ\4RX\3TX\2MREGS\1STATS"
/* Do not staticize - meant for calling from DDB! */
int en_dump(unit, level)
int unit, level;
{
struct en_softc *sc;
int lcv, cnt, slot;
u_int32_t ptr, reg;
#ifdef __FreeBSD__
devclass_t dc;
int maxunit;
dc = devclass_find("en");
if (dc == NULL) {
printf("en_dump: can't find devclass!\n");
return 0;
}
maxunit = devclass_get_maxunit(dc);
for (lcv = 0 ; lcv < maxunit ; lcv++) {
sc = devclass_get_softc(dc, lcv);
#else
for (lcv = 0 ; lcv < en_cd.cd_ndevs ; lcv++) {
sc = (struct en_softc *) en_cd.cd_devs[lcv];
#endif
if (sc == NULL) continue;
if (unit != -1 && unit != lcv)
continue;
printf("dumping device %s at level 0x%b\n", sc->sc_dev.dv_xname, level,
END_BITS);
if (sc->dtq_us == 0) {
printf("<hasn't been en_init'd yet>\n");
continue;
}
if (level & END_STATS) {
printf(" en_stats:\n");
printf(" %d mfix (%d failed); %d/%d head/tail byte DMAs, %d flushes\n",
sc->mfix, sc->mfixfail, sc->headbyte, sc->tailbyte, sc->tailflush);
printf(" %d rx dma overflow interrupts\n", sc->dmaovr);
printf(" %d times we ran out of TX space and stalled\n",
sc->txoutspace);
printf(" %d times we ran out of DTQs\n", sc->txdtqout);
printf(" %d times we launched a packet\n", sc->launch);
printf(" %d times we launched without on-board header\n", sc->lheader);
printf(" %d times we launched without on-board tail\n", sc->ltail);
printf(" %d times we pulled the hw service list\n", sc->hwpull);
printf(" %d times we pushed a vci on the sw service list\n",
sc->swadd);
printf(" %d times RX pulled an mbuf from Q that wasn't ours\n",
sc->rxqnotus);
printf(" %d times RX pulled a good mbuf from Q\n", sc->rxqus);
printf(" %d times we ran out of mbufs *and* DRQs\n", sc->rxoutboth);
printf(" %d times we ran out of DRQs\n", sc->rxdrqout);
printf(" %d trasmit packets dropped due to mbsize\n", sc->txmbovr);
printf(" %d cells trashed due to turned off rxvc\n", sc->vtrash);
printf(" %d cells trashed due to totally full buffer\n", sc->otrash);
printf(" %d cells trashed due almost full buffer\n", sc->ttrash);
printf(" %d rx mbuf allocation failures\n", sc->rxmbufout);
#ifdef NATM
#if 0
printf(" %d drops at natmintrq\n", natmintrq.ifq_drops);
#endif
#ifdef NATM_STAT
printf(" natmintr so_rcv: ok/drop cnt: %d/%d, ok/drop bytes: %d/%d\n",
natm_sookcnt, natm_sodropcnt, natm_sookbytes, natm_sodropbytes);
#endif
#endif
}
if (level & END_MREGS) {
printf("mregs:\n");
printf("resid = 0x%x\n", EN_READ(sc, MID_RESID));
printf("interrupt status = 0x%b\n",
(int)EN_READ(sc, MID_INTSTAT), MID_INTBITS);
printf("interrupt enable = 0x%b\n",
(int)EN_READ(sc, MID_INTENA), MID_INTBITS);
printf("mcsr = 0x%b\n", (int)EN_READ(sc, MID_MAST_CSR), MID_MCSRBITS);
printf("serv_write = [chip=%u] [us=%u]\n", EN_READ(sc, MID_SERV_WRITE),
MID_SL_A2REG(sc->hwslistp));
printf("dma addr = 0x%x\n", EN_READ(sc, MID_DMA_ADDR));
printf("DRQ: chip[rd=0x%x,wr=0x%x], sc[chip=0x%x,us=0x%x]\n",
MID_DRQ_REG2A(EN_READ(sc, MID_DMA_RDRX)),
MID_DRQ_REG2A(EN_READ(sc, MID_DMA_WRRX)), sc->drq_chip, sc->drq_us);
printf("DTQ: chip[rd=0x%x,wr=0x%x], sc[chip=0x%x,us=0x%x]\n",
MID_DTQ_REG2A(EN_READ(sc, MID_DMA_RDTX)),
MID_DTQ_REG2A(EN_READ(sc, MID_DMA_WRTX)), sc->dtq_chip, sc->dtq_us);
printf(" unusal txspeeds: ");
for (cnt = 0 ; cnt < MID_N_VC ; cnt++)
if (sc->txspeed[cnt])
printf(" vci%d=0x%x", cnt, sc->txspeed[cnt]);
printf("\n");
printf(" rxvc slot mappings: ");
for (cnt = 0 ; cnt < MID_N_VC ; cnt++)
if (sc->rxvc2slot[cnt] != RX_NONE)
printf(" %d->%d", cnt, sc->rxvc2slot[cnt]);
printf("\n");
}
if (level & END_TX) {
printf("tx:\n");
for (slot = 0 ; slot < EN_NTX; slot++) {
printf("tx%d: start/stop/cur=0x%x/0x%x/0x%x [%d] ", slot,
sc->txslot[slot].start, sc->txslot[slot].stop, sc->txslot[slot].cur,
(sc->txslot[slot].cur - sc->txslot[slot].start)/4);
printf("mbsize=%d, bfree=%d\n", sc->txslot[slot].mbsize,
sc->txslot[slot].bfree);
printf("txhw: base_address=0x%x, size=%u, read=%u, descstart=%u\n",
(u_int)MIDX_BASE(EN_READ(sc, MIDX_PLACE(slot))),
MIDX_SZ(EN_READ(sc, MIDX_PLACE(slot))),
EN_READ(sc, MIDX_READPTR(slot)), EN_READ(sc, MIDX_DESCSTART(slot)));
}
}
if (level & END_RX) {
printf(" recv slots:\n");
for (slot = 0 ; slot < sc->en_nrx; slot++) {
printf("rx%d: vci=%d: start/stop/cur=0x%x/0x%x/0x%x ", slot,
sc->rxslot[slot].atm_vci, sc->rxslot[slot].start,
sc->rxslot[slot].stop, sc->rxslot[slot].cur);
printf("mode=0x%x, atm_flags=0x%x, oth_flags=0x%x\n",
sc->rxslot[slot].mode, sc->rxslot[slot].atm_flags,
sc->rxslot[slot].oth_flags);
printf("RXHW: mode=0x%x, DST_RP=0x%x, WP_ST_CNT=0x%x\n",
EN_READ(sc, MID_VC(sc->rxslot[slot].atm_vci)),
EN_READ(sc, MID_DST_RP(sc->rxslot[slot].atm_vci)),
EN_READ(sc, MID_WP_ST_CNT(sc->rxslot[slot].atm_vci)));
}
}
if (level & END_DTQ) {
printf(" dtq [need_dtqs=%d,dtq_free=%d]:\n",
sc->need_dtqs, sc->dtq_free);
ptr = sc->dtq_chip;
while (ptr != sc->dtq_us) {
reg = EN_READ(sc, ptr);
printf("\t0x%x=[cnt=%d, chan=%d, end=%d, type=%d @ 0x%x]\n",
sc->dtq[MID_DTQ_A2REG(ptr)], MID_DMA_CNT(reg), MID_DMA_TXCHAN(reg),
(reg & MID_DMA_END) != 0, MID_DMA_TYPE(reg), EN_READ(sc, ptr+4));
EN_WRAPADD(MID_DTQOFF, MID_DTQEND, ptr, 8);
}
}
if (level & END_DRQ) {
printf(" drq [need_drqs=%d,drq_free=%d]:\n",
sc->need_drqs, sc->drq_free);
ptr = sc->drq_chip;
while (ptr != sc->drq_us) {
reg = EN_READ(sc, ptr);
printf("\t0x%x=[cnt=%d, chan=%d, end=%d, type=%d @ 0x%x]\n",
sc->drq[MID_DRQ_A2REG(ptr)], MID_DMA_CNT(reg), MID_DMA_RXVCI(reg),
(reg & MID_DMA_END) != 0, MID_DMA_TYPE(reg), EN_READ(sc, ptr+4));
EN_WRAPADD(MID_DRQOFF, MID_DRQEND, ptr, 8);
}
}
if (level & END_SWSL) {
printf(" swslist [size=%d]: ", sc->swsl_size);
for (cnt = sc->swsl_head ; cnt != sc->swsl_tail ;
cnt = (cnt + 1) % MID_SL_N)
printf("0x%x ", sc->swslist[cnt]);
printf("\n");
}
}
return(0);
}
/*
* en_dumpmem: dump the memory
*/
/* Do not staticize - meant for calling from DDB! */
int en_dumpmem(unit, addr, len)
int unit, addr, len;
{
struct en_softc *sc;
u_int32_t reg;
#ifdef __FreeBSD__
devclass_t dc;
dc = devclass_find("en");
if (dc == NULL) {
printf("en_dumpmem: can't find devclass!\n");
return 0;
}
sc = devclass_get_softc(dc, unit);
#else
if (unit < 0 || unit > en_cd.cd_ndevs ||
(sc = (struct en_softc *) en_cd.cd_devs[unit]) == NULL) {
printf("invalid unit number: %d\n", unit);
return(0);
}
#endif
addr = addr & ~3;
if (addr < MID_RAMOFF || addr + len*4 > MID_MAXOFF || len <= 0) {
printf("invalid addr/len number: %d, %d\n", addr, len);
return(0);
}
printf("dumping %d words starting at offset 0x%x\n", len, addr);
while (len--) {
reg = EN_READ(sc, addr);
printf("mem[0x%x] = 0x%x\n", addr, reg);
addr += 4;
}
return(0);
}
#endif
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