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eni.c
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// SPDX-License-Identifier: GPL-2.0-only
/* drivers/atm/eni.c - Efficient Networks ENI155P device driver */
/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/pci.h>
#include <linux/errno.h>
#include <linux/atm.h>
#include <linux/atmdev.h>
#include <linux/sonet.h>
#include <linux/skbuff.h>
#include <linux/time.h>
#include <linux/delay.h>
#include <linux/uio.h>
#include <linux/init.h>
#include <linux/atm_eni.h>
#include <linux/bitops.h>
#include <linux/slab.h>
#include <asm/io.h>
#include <linux/atomic.h>
#include <linux/uaccess.h>
#include <asm/string.h>
#include <asm/byteorder.h>
#include "tonga.h"
#include "midway.h"
#include "suni.h"
#include "eni.h"
/*
* TODO:
*
* Show stoppers
* none
*
* Minor
* - OAM support
* - fix bugs listed below
*/
/*
* KNOWN BUGS:
*
* - may run into JK-JK bug and deadlock
* - should allocate UBR channel first
* - buffer space allocation algorithm is stupid
* (RX: should be maxSDU+maxdelay*rate
* TX: should be maxSDU+min(maxSDU,maxdelay*rate) )
* - doesn't support OAM cells
* - eni_put_free may hang if not putting memory fragments that _complete_
* 2^n block (never happens in real life, though)
*/
#if 0
#define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
#else
#define DPRINTK(format,args...)
#endif
#ifndef CONFIG_ATM_ENI_TUNE_BURST
#define CONFIG_ATM_ENI_BURST_TX_8W
#define CONFIG_ATM_ENI_BURST_RX_4W
#endif
#ifndef CONFIG_ATM_ENI_DEBUG
#define NULLCHECK(x)
#define EVENT(s,a,b)
static void event_dump(void)
{
}
#else
/*
* NULL pointer checking
*/
#define NULLCHECK(x) \
if ((unsigned long) (x) < 0x30) \
printk(KERN_CRIT #x "==0x%lx\n",(unsigned long) (x))
/*
* Very extensive activity logging. Greatly improves bug detection speed but
* costs a few Mbps if enabled.
*/
#define EV 64
static const char *ev[EV];
static unsigned long ev_a[EV],ev_b[EV];
static int ec = 0;
static void EVENT(const char *s,unsigned long a,unsigned long b)
{
ev[ec] = s;
ev_a[ec] = a;
ev_b[ec] = b;
ec = (ec+1) % EV;
}
static void event_dump(void)
{
int n,i;
for (n = 0; n < EV; n++) {
i = (ec+n) % EV;
printk(KERN_NOTICE);
printk(ev[i] ? ev[i] : "(null)",ev_a[i],ev_b[i]);
}
}
#endif /* CONFIG_ATM_ENI_DEBUG */
/*
* NExx must not be equal at end
* EExx may be equal at end
* xxPJOK verify validity of pointer jumps
* xxPMOK operating on a circular buffer of "c" words
*/
#define NEPJOK(a0,a1,b) \
((a0) < (a1) ? (b) <= (a0) || (b) > (a1) : (b) <= (a0) && (b) > (a1))
#define EEPJOK(a0,a1,b) \
((a0) < (a1) ? (b) < (a0) || (b) >= (a1) : (b) < (a0) && (b) >= (a1))
#define NEPMOK(a0,d,b,c) NEPJOK(a0,(a0+d) & (c-1),b)
#define EEPMOK(a0,d,b,c) EEPJOK(a0,(a0+d) & (c-1),b)
static int tx_complete = 0,dma_complete = 0,queued = 0,requeued = 0,
backlogged = 0,rx_enqueued = 0,rx_dequeued = 0,pushed = 0,submitted = 0,
putting = 0;
static struct atm_dev *eni_boards = NULL;
/* Read/write registers on card */
#define eni_in(r) readl(eni_dev->reg+(r)*4)
#define eni_out(v,r) writel((v),eni_dev->reg+(r)*4)
/*-------------------------------- utilities --------------------------------*/
static void dump_mem(struct eni_dev *eni_dev)
{
int i;
for (i = 0; i < eni_dev->free_len; i++)
printk(KERN_DEBUG " %d: %p %d\n",i,
eni_dev->free_list[i].start,
1 << eni_dev->free_list[i].order);
}
static void dump(struct atm_dev *dev)
{
struct eni_dev *eni_dev;
int i;
eni_dev = ENI_DEV(dev);
printk(KERN_NOTICE "Free memory\n");
dump_mem(eni_dev);
printk(KERN_NOTICE "TX buffers\n");
for (i = 0; i < NR_CHAN; i++)
if (eni_dev->tx[i].send)
printk(KERN_NOTICE " TX %d @ %p: %ld\n",i,
eni_dev->tx[i].send,eni_dev->tx[i].words*4);
printk(KERN_NOTICE "RX buffers\n");
for (i = 0; i < 1024; i++)
if (eni_dev->rx_map[i] && ENI_VCC(eni_dev->rx_map[i])->rx)
printk(KERN_NOTICE " RX %d @ %p: %ld\n",i,
ENI_VCC(eni_dev->rx_map[i])->recv,
ENI_VCC(eni_dev->rx_map[i])->words*4);
printk(KERN_NOTICE "----\n");
}
static void eni_put_free(struct eni_dev *eni_dev, void __iomem *start,
unsigned long size)
{
struct eni_free *list;
int len,order;
DPRINTK("init 0x%lx+%ld(0x%lx)\n",start,size,size);
start += eni_dev->base_diff;
list = eni_dev->free_list;
len = eni_dev->free_len;
while (size) {
if (len >= eni_dev->free_list_size) {
printk(KERN_CRIT "eni_put_free overflow (%p,%ld)\n",
start,size);
break;
}
for (order = 0; !(((unsigned long)start | size) & (1 << order)); order++);
if (MID_MIN_BUF_SIZE > (1 << order)) {
printk(KERN_CRIT "eni_put_free: order %d too small\n",
order);
break;
}
list[len].start = (void __iomem *) start;
list[len].order = order;
len++;
start += 1 << order;
size -= 1 << order;
}
eni_dev->free_len = len;
/*dump_mem(eni_dev);*/
}
static void __iomem *eni_alloc_mem(struct eni_dev *eni_dev, unsigned long *size)
{
struct eni_free *list;
void __iomem *start;
int len,i,order,best_order,index;
list = eni_dev->free_list;
len = eni_dev->free_len;
if (*size < MID_MIN_BUF_SIZE) *size = MID_MIN_BUF_SIZE;
if (*size > MID_MAX_BUF_SIZE) return NULL;
for (order = 0; (1 << order) < *size; order++)
;
DPRINTK("trying: %ld->%d\n",*size,order);
best_order = 65; /* we don't have more than 2^64 of anything ... */
index = 0; /* silence GCC */
for (i = 0; i < len; i++)
if (list[i].order == order) {
best_order = order;
index = i;
break;
}
else if (best_order > list[i].order && list[i].order > order) {
best_order = list[i].order;
index = i;
}
if (best_order == 65) return NULL;
start = list[index].start-eni_dev->base_diff;
list[index] = list[--len];
eni_dev->free_len = len;
*size = 1 << order;
eni_put_free(eni_dev,start+*size,(1 << best_order)-*size);
DPRINTK("%ld bytes (order %d) at 0x%lx\n",*size,order,start);
memset_io(start,0,*size); /* never leak data */
/*dump_mem(eni_dev);*/
return start;
}
static void eni_free_mem(struct eni_dev *eni_dev, void __iomem *start,
unsigned long size)
{
struct eni_free *list;
int len,i,order;
start += eni_dev->base_diff;
list = eni_dev->free_list;
len = eni_dev->free_len;
for (order = -1; size; order++) size >>= 1;
DPRINTK("eni_free_mem: %p+0x%lx (order %d)\n",start,size,order);
for (i = 0; i < len; i++)
if (((unsigned long) list[i].start) == ((unsigned long)start^(1 << order)) &&
list[i].order == order) {
DPRINTK("match[%d]: 0x%lx/0x%lx(0x%x), %d/%d\n",i,
list[i].start,start,1 << order,list[i].order,order);
list[i] = list[--len];
start = (void __iomem *) ((unsigned long) start & ~(unsigned long) (1 << order));
order++;
i = -1;
continue;
}
if (len >= eni_dev->free_list_size) {
printk(KERN_ALERT "eni_free_mem overflow (%p,%d)\n",start,
order);
return;
}
list[len].start = start;
list[len].order = order;
eni_dev->free_len = len+1;
/*dump_mem(eni_dev);*/
}
/*----------------------------------- RX ------------------------------------*/
#define ENI_VCC_NOS ((struct atm_vcc *) 1)
static void rx_ident_err(struct atm_vcc *vcc)
{
struct atm_dev *dev;
struct eni_dev *eni_dev;
struct eni_vcc *eni_vcc;
dev = vcc->dev;
eni_dev = ENI_DEV(dev);
/* immediately halt adapter */
eni_out(eni_in(MID_MC_S) &
~(MID_DMA_ENABLE | MID_TX_ENABLE | MID_RX_ENABLE),MID_MC_S);
/* dump useful information */
eni_vcc = ENI_VCC(vcc);
printk(KERN_ALERT DEV_LABEL "(itf %d): driver error - RX ident "
"mismatch\n",dev->number);
printk(KERN_ALERT " VCI %d, rxing %d, words %ld\n",vcc->vci,
eni_vcc->rxing,eni_vcc->words);
printk(KERN_ALERT " host descr 0x%lx, rx pos 0x%lx, descr value "
"0x%x\n",eni_vcc->descr,eni_vcc->rx_pos,
(unsigned) readl(eni_vcc->recv+eni_vcc->descr*4));
printk(KERN_ALERT " last %p, servicing %d\n",eni_vcc->last,
eni_vcc->servicing);
EVENT("---dump ends here---\n",0,0);
printk(KERN_NOTICE "---recent events---\n");
event_dump();
ENI_DEV(dev)->fast = NULL; /* really stop it */
ENI_DEV(dev)->slow = NULL;
skb_queue_head_init(&ENI_DEV(dev)->rx_queue);
}
static int do_rx_dma(struct atm_vcc *vcc,struct sk_buff *skb,
unsigned long skip,unsigned long size,unsigned long eff)
{
struct eni_dev *eni_dev;
struct eni_vcc *eni_vcc;
u32 dma_rd,dma_wr;
u32 dma[RX_DMA_BUF*2];
dma_addr_t paddr;
unsigned long here;
int i,j;
eni_dev = ENI_DEV(vcc->dev);
eni_vcc = ENI_VCC(vcc);
paddr = 0; /* GCC, shut up */
if (skb) {
paddr = dma_map_single(&eni_dev->pci_dev->dev,skb->data,skb->len,
DMA_FROM_DEVICE);
if (dma_mapping_error(&eni_dev->pci_dev->dev, paddr))
goto dma_map_error;
ENI_PRV_PADDR(skb) = paddr;
if (paddr & 3)
printk(KERN_CRIT DEV_LABEL "(itf %d): VCI %d has "
"mis-aligned RX data (0x%lx)\n",vcc->dev->number,
vcc->vci,(unsigned long) paddr);
ENI_PRV_SIZE(skb) = size+skip;
/* PDU plus descriptor */
ATM_SKB(skb)->vcc = vcc;
}
j = 0;
if ((eff && skip) || 1) { /* @@@ actually, skip is always == 1 ... */
here = (eni_vcc->descr+skip) & (eni_vcc->words-1);
dma[j++] = (here << MID_DMA_COUNT_SHIFT) | (vcc->vci
<< MID_DMA_VCI_SHIFT) | MID_DT_JK;
dma[j++] = 0;
}
here = (eni_vcc->descr+size+skip) & (eni_vcc->words-1);
if (!eff) size += skip;
else {
unsigned long words;
if (!size) {
DPRINTK("strange things happen ...\n");
EVENT("strange things happen ... (skip=%ld,eff=%ld)\n",
size,eff);
}
words = eff;
if (paddr & 15) {
unsigned long init;
init = 4-((paddr & 15) >> 2);
if (init > words) init = words;
dma[j++] = MID_DT_WORD | (init << MID_DMA_COUNT_SHIFT) |
(vcc->vci << MID_DMA_VCI_SHIFT);
dma[j++] = paddr;
paddr += init << 2;
words -= init;
}
#ifdef CONFIG_ATM_ENI_BURST_RX_16W /* may work with some PCI chipsets ... */
if (words & ~15) {
dma[j++] = MID_DT_16W | ((words >> 4) <<
MID_DMA_COUNT_SHIFT) | (vcc->vci <<
MID_DMA_VCI_SHIFT);
dma[j++] = paddr;
paddr += (words & ~15) << 2;
words &= 15;
}
#endif
#ifdef CONFIG_ATM_ENI_BURST_RX_8W /* works only with *some* PCI chipsets ... */
if (words & ~7) {
dma[j++] = MID_DT_8W | ((words >> 3) <<
MID_DMA_COUNT_SHIFT) | (vcc->vci <<
MID_DMA_VCI_SHIFT);
dma[j++] = paddr;
paddr += (words & ~7) << 2;
words &= 7;
}
#endif
#ifdef CONFIG_ATM_ENI_BURST_RX_4W /* recommended */
if (words & ~3) {
dma[j++] = MID_DT_4W | ((words >> 2) <<
MID_DMA_COUNT_SHIFT) | (vcc->vci <<
MID_DMA_VCI_SHIFT);
dma[j++] = paddr;
paddr += (words & ~3) << 2;
words &= 3;
}
#endif
#ifdef CONFIG_ATM_ENI_BURST_RX_2W /* probably useless if RX_4W, RX_8W, ... */
if (words & ~1) {
dma[j++] = MID_DT_2W | ((words >> 1) <<
MID_DMA_COUNT_SHIFT) | (vcc->vci <<
MID_DMA_VCI_SHIFT);
dma[j++] = paddr;
paddr += (words & ~1) << 2;
words &= 1;
}
#endif
if (words) {
dma[j++] = MID_DT_WORD | (words << MID_DMA_COUNT_SHIFT)
| (vcc->vci << MID_DMA_VCI_SHIFT);
dma[j++] = paddr;
}
}
if (size != eff) {
dma[j++] = (here << MID_DMA_COUNT_SHIFT) |
(vcc->vci << MID_DMA_VCI_SHIFT) | MID_DT_JK;
dma[j++] = 0;
}
if (!j || j > 2*RX_DMA_BUF) {
printk(KERN_CRIT DEV_LABEL "!j or j too big!!!\n");
goto trouble;
}
dma[j-2] |= MID_DMA_END;
j = j >> 1;
dma_wr = eni_in(MID_DMA_WR_RX);
dma_rd = eni_in(MID_DMA_RD_RX);
/*
* Can I move the dma_wr pointer by 2j+1 positions without overwriting
* data that hasn't been read (position of dma_rd) yet ?
*/
if (!NEPMOK(dma_wr,j+j+1,dma_rd,NR_DMA_RX)) { /* @@@ +1 is ugly */
printk(KERN_WARNING DEV_LABEL "(itf %d): RX DMA full\n",
vcc->dev->number);
goto trouble;
}
for (i = 0; i < j; i++) {
writel(dma[i*2],eni_dev->rx_dma+dma_wr*8);
writel(dma[i*2+1],eni_dev->rx_dma+dma_wr*8+4);
dma_wr = (dma_wr+1) & (NR_DMA_RX-1);
}
if (skb) {
ENI_PRV_POS(skb) = eni_vcc->descr+size+1;
skb_queue_tail(&eni_dev->rx_queue,skb);
eni_vcc->last = skb;
rx_enqueued++;
}
eni_vcc->descr = here;
eni_out(dma_wr,MID_DMA_WR_RX);
return 0;
trouble:
if (paddr)
dma_unmap_single(&eni_dev->pci_dev->dev,paddr,skb->len,
DMA_FROM_DEVICE);
dma_map_error:
if (skb) dev_kfree_skb_irq(skb);
return -1;
}
static void discard(struct atm_vcc *vcc,unsigned long size)
{
struct eni_vcc *eni_vcc;
eni_vcc = ENI_VCC(vcc);
EVENT("discard (size=%ld)\n",size,0);
while (do_rx_dma(vcc,NULL,1,size,0)) EVENT("BUSY LOOP",0,0);
/* could do a full fallback, but that might be more expensive */
if (eni_vcc->rxing) ENI_PRV_POS(eni_vcc->last) += size+1;
else eni_vcc->rx_pos = (eni_vcc->rx_pos+size+1) & (eni_vcc->words-1);
}
/*
* TODO: should check whether direct copies (without DMA setup, dequeuing on
* interrupt, etc.) aren't much faster for AAL0
*/
static int rx_aal0(struct atm_vcc *vcc)
{
struct eni_vcc *eni_vcc;
unsigned long descr;
unsigned long length;
struct sk_buff *skb;
DPRINTK(">rx_aal0\n");
eni_vcc = ENI_VCC(vcc);
descr = readl(eni_vcc->recv+eni_vcc->descr*4);
if ((descr & MID_RED_IDEN) != (MID_RED_RX_ID << MID_RED_SHIFT)) {
rx_ident_err(vcc);
return 1;
}
if (descr & MID_RED_T) {
DPRINTK(DEV_LABEL "(itf %d): trashing empty cell\n",
vcc->dev->number);
length = 0;
atomic_inc(&vcc->stats->rx_err);
}
else {
length = ATM_CELL_SIZE-1; /* no HEC */
}
skb = length ? atm_alloc_charge(vcc,length,GFP_ATOMIC) : NULL;
if (!skb) {
discard(vcc,length >> 2);
return 0;
}
skb_put(skb,length);
skb->tstamp = eni_vcc->timestamp;
DPRINTK("got len %ld\n",length);
if (do_rx_dma(vcc,skb,1,length >> 2,length >> 2)) return 1;
eni_vcc->rxing++;
return 0;
}
static int rx_aal5(struct atm_vcc *vcc)
{
struct eni_vcc *eni_vcc;
unsigned long descr;
unsigned long size,eff,length;
struct sk_buff *skb;
EVENT("rx_aal5\n",0,0);
DPRINTK(">rx_aal5\n");
eni_vcc = ENI_VCC(vcc);
descr = readl(eni_vcc->recv+eni_vcc->descr*4);
if ((descr & MID_RED_IDEN) != (MID_RED_RX_ID << MID_RED_SHIFT)) {
rx_ident_err(vcc);
return 1;
}
if (descr & (MID_RED_T | MID_RED_CRC_ERR)) {
if (descr & MID_RED_T) {
EVENT("empty cell (descr=0x%lx)\n",descr,0);
DPRINTK(DEV_LABEL "(itf %d): trashing empty cell\n",
vcc->dev->number);
size = 0;
}
else {
static unsigned long silence = 0;
if (time_after(jiffies, silence) || silence == 0) {
printk(KERN_WARNING DEV_LABEL "(itf %d): "
"discarding PDU(s) with CRC error\n",
vcc->dev->number);
silence = (jiffies+2*HZ)|1;
}
size = (descr & MID_RED_COUNT)*(ATM_CELL_PAYLOAD >> 2);
EVENT("CRC error (descr=0x%lx,size=%ld)\n",descr,
size);
}
eff = length = 0;
atomic_inc(&vcc->stats->rx_err);
}
else {
size = (descr & MID_RED_COUNT)*(ATM_CELL_PAYLOAD >> 2);
DPRINTK("size=%ld\n",size);
length = readl(eni_vcc->recv+(((eni_vcc->descr+size-1) &
(eni_vcc->words-1)))*4) & 0xffff;
/* -trailer(2)+header(1) */
if (length && length <= (size << 2)-8 && length <=
ATM_MAX_AAL5_PDU) eff = (length+3) >> 2;
else { /* ^ trailer length (8) */
EVENT("bad PDU (descr=0x08%lx,length=%ld)\n",descr,
length);
printk(KERN_ERR DEV_LABEL "(itf %d): bad AAL5 PDU "
"(VCI=%d,length=%ld,size=%ld (descr 0x%lx))\n",
vcc->dev->number,vcc->vci,length,size << 2,descr);
length = eff = 0;
atomic_inc(&vcc->stats->rx_err);
}
}
skb = eff ? atm_alloc_charge(vcc,eff << 2,GFP_ATOMIC) : NULL;
if (!skb) {
discard(vcc,size);
return 0;
}
skb_put(skb,length);
DPRINTK("got len %ld\n",length);
if (do_rx_dma(vcc,skb,1,size,eff)) return 1;
eni_vcc->rxing++;
return 0;
}
static inline int rx_vcc(struct atm_vcc *vcc)
{
void __iomem *vci_dsc;
unsigned long tmp;
struct eni_vcc *eni_vcc;
eni_vcc = ENI_VCC(vcc);
vci_dsc = ENI_DEV(vcc->dev)->vci+vcc->vci*16;
EVENT("rx_vcc(1)\n",0,0);
while (eni_vcc->descr != (tmp = (readl(vci_dsc+4) & MID_VCI_DESCR) >>
MID_VCI_DESCR_SHIFT)) {
EVENT("rx_vcc(2: host dsc=0x%lx, nic dsc=0x%lx)\n",
eni_vcc->descr,tmp);
DPRINTK("CB_DESCR %ld REG_DESCR %d\n",ENI_VCC(vcc)->descr,
(((unsigned) readl(vci_dsc+4) & MID_VCI_DESCR) >>
MID_VCI_DESCR_SHIFT));
if (ENI_VCC(vcc)->rx(vcc)) return 1;
}
/* clear IN_SERVICE flag */
writel(readl(vci_dsc) & ~MID_VCI_IN_SERVICE,vci_dsc);
/*
* If new data has arrived between evaluating the while condition and
* clearing IN_SERVICE, we wouldn't be notified until additional data
* follows. So we have to loop again to be sure.
*/
EVENT("rx_vcc(3)\n",0,0);
while (ENI_VCC(vcc)->descr != (tmp = (readl(vci_dsc+4) & MID_VCI_DESCR)
>> MID_VCI_DESCR_SHIFT)) {
EVENT("rx_vcc(4: host dsc=0x%lx, nic dsc=0x%lx)\n",
eni_vcc->descr,tmp);
DPRINTK("CB_DESCR %ld REG_DESCR %d\n",ENI_VCC(vcc)->descr,
(((unsigned) readl(vci_dsc+4) & MID_VCI_DESCR) >>
MID_VCI_DESCR_SHIFT));
if (ENI_VCC(vcc)->rx(vcc)) return 1;
}
return 0;
}
static void poll_rx(struct atm_dev *dev)
{
struct eni_dev *eni_dev;
struct atm_vcc *curr;
eni_dev = ENI_DEV(dev);
while ((curr = eni_dev->fast)) {
EVENT("poll_rx.fast\n",0,0);
if (rx_vcc(curr)) return;
eni_dev->fast = ENI_VCC(curr)->next;
ENI_VCC(curr)->next = ENI_VCC_NOS;
barrier();
ENI_VCC(curr)->servicing--;
}
while ((curr = eni_dev->slow)) {
EVENT("poll_rx.slow\n",0,0);
if (rx_vcc(curr)) return;
eni_dev->slow = ENI_VCC(curr)->next;
ENI_VCC(curr)->next = ENI_VCC_NOS;
barrier();
ENI_VCC(curr)->servicing--;
}
}
static void get_service(struct atm_dev *dev)
{
struct eni_dev *eni_dev;
struct atm_vcc *vcc;
unsigned long vci;
DPRINTK(">get_service\n");
eni_dev = ENI_DEV(dev);
while (eni_in(MID_SERV_WRITE) != eni_dev->serv_read) {
vci = readl(eni_dev->service+eni_dev->serv_read*4);
eni_dev->serv_read = (eni_dev->serv_read+1) & (NR_SERVICE-1);
vcc = eni_dev->rx_map[vci & 1023];
if (!vcc) {
printk(KERN_CRIT DEV_LABEL "(itf %d): VCI %ld not "
"found\n",dev->number,vci);
continue; /* nasty but we try to go on anyway */
/* @@@ nope, doesn't work */
}
EVENT("getting from service\n",0,0);
if (ENI_VCC(vcc)->next != ENI_VCC_NOS) {
EVENT("double service\n",0,0);
DPRINTK("Grr, servicing VCC %ld twice\n",vci);
continue;
}
ENI_VCC(vcc)->timestamp = ktime_get_real();
ENI_VCC(vcc)->next = NULL;
if (vcc->qos.rxtp.traffic_class == ATM_CBR) {
if (eni_dev->fast)
ENI_VCC(eni_dev->last_fast)->next = vcc;
else eni_dev->fast = vcc;
eni_dev->last_fast = vcc;
}
else {
if (eni_dev->slow)
ENI_VCC(eni_dev->last_slow)->next = vcc;
else eni_dev->slow = vcc;
eni_dev->last_slow = vcc;
}
putting++;
ENI_VCC(vcc)->servicing++;
}
}
static void dequeue_rx(struct atm_dev *dev)
{
struct eni_dev *eni_dev;
struct eni_vcc *eni_vcc;
struct atm_vcc *vcc;
struct sk_buff *skb;
void __iomem *vci_dsc;
int first;
eni_dev = ENI_DEV(dev);
first = 1;
while (1) {
skb = skb_dequeue(&eni_dev->rx_queue);
if (!skb) {
if (first) {
DPRINTK(DEV_LABEL "(itf %d): RX but not "
"rxing\n",dev->number);
EVENT("nothing to dequeue\n",0,0);
}
break;
}
EVENT("dequeued (size=%ld,pos=0x%lx)\n",ENI_PRV_SIZE(skb),
ENI_PRV_POS(skb));
rx_dequeued++;
vcc = ATM_SKB(skb)->vcc;
eni_vcc = ENI_VCC(vcc);
first = 0;
vci_dsc = eni_dev->vci+vcc->vci*16;
if (!EEPMOK(eni_vcc->rx_pos,ENI_PRV_SIZE(skb),
(readl(vci_dsc+4) & MID_VCI_READ) >> MID_VCI_READ_SHIFT,
eni_vcc->words)) {
EVENT("requeuing\n",0,0);
skb_queue_head(&eni_dev->rx_queue,skb);
break;
}
eni_vcc->rxing--;
eni_vcc->rx_pos = ENI_PRV_POS(skb) & (eni_vcc->words-1);
dma_unmap_single(&eni_dev->pci_dev->dev,ENI_PRV_PADDR(skb),skb->len,
DMA_TO_DEVICE);
if (!skb->len) dev_kfree_skb_irq(skb);
else {
EVENT("pushing (len=%ld)\n",skb->len,0);
if (vcc->qos.aal == ATM_AAL0)
*(unsigned long *) skb->data =
ntohl(*(unsigned long *) skb->data);
memset(skb->cb,0,sizeof(struct eni_skb_prv));
vcc->push(vcc,skb);
pushed++;
}
atomic_inc(&vcc->stats->rx);
}
wake_up(&eni_dev->rx_wait);
}
static int open_rx_first(struct atm_vcc *vcc)
{
struct eni_dev *eni_dev;
struct eni_vcc *eni_vcc;
unsigned long size;
DPRINTK("open_rx_first\n");
eni_dev = ENI_DEV(vcc->dev);
eni_vcc = ENI_VCC(vcc);
eni_vcc->rx = NULL;
if (vcc->qos.rxtp.traffic_class == ATM_NONE) return 0;
size = vcc->qos.rxtp.max_sdu*eni_dev->rx_mult/100;
if (size > MID_MAX_BUF_SIZE && vcc->qos.rxtp.max_sdu <=
MID_MAX_BUF_SIZE)
size = MID_MAX_BUF_SIZE;
eni_vcc->recv = eni_alloc_mem(eni_dev,&size);
DPRINTK("rx at 0x%lx\n",eni_vcc->recv);
eni_vcc->words = size >> 2;
if (!eni_vcc->recv) return -ENOBUFS;
eni_vcc->rx = vcc->qos.aal == ATM_AAL5 ? rx_aal5 : rx_aal0;
eni_vcc->descr = 0;
eni_vcc->rx_pos = 0;
eni_vcc->rxing = 0;
eni_vcc->servicing = 0;
eni_vcc->next = ENI_VCC_NOS;
return 0;
}
static int open_rx_second(struct atm_vcc *vcc)
{
void __iomem *here;
struct eni_dev *eni_dev;
struct eni_vcc *eni_vcc;
unsigned long size;
int order;
DPRINTK("open_rx_second\n");
eni_dev = ENI_DEV(vcc->dev);
eni_vcc = ENI_VCC(vcc);
if (!eni_vcc->rx) return 0;
/* set up VCI descriptor */
here = eni_dev->vci+vcc->vci*16;
DPRINTK("loc 0x%x\n",(unsigned) (eni_vcc->recv-eni_dev->ram)/4);
size = eni_vcc->words >> 8;
for (order = -1; size; order++) size >>= 1;
writel(0,here+4); /* descr, read = 0 */
writel(0,here+8); /* write, state, count = 0 */
if (eni_dev->rx_map[vcc->vci])
printk(KERN_CRIT DEV_LABEL "(itf %d): BUG - VCI %d already "
"in use\n",vcc->dev->number,vcc->vci);
eni_dev->rx_map[vcc->vci] = vcc; /* now it counts */
writel(((vcc->qos.aal != ATM_AAL5 ? MID_MODE_RAW : MID_MODE_AAL5) <<
MID_VCI_MODE_SHIFT) | MID_VCI_PTI_MODE |
(((eni_vcc->recv-eni_dev->ram) >> (MID_LOC_SKIP+2)) <<
MID_VCI_LOCATION_SHIFT) | (order << MID_VCI_SIZE_SHIFT),here);
return 0;
}
static void close_rx(struct atm_vcc *vcc)
{
DECLARE_WAITQUEUE(wait,current);
void __iomem *here;
struct eni_dev *eni_dev;
struct eni_vcc *eni_vcc;
eni_vcc = ENI_VCC(vcc);
if (!eni_vcc->rx) return;
eni_dev = ENI_DEV(vcc->dev);
if (vcc->vpi != ATM_VPI_UNSPEC && vcc->vci != ATM_VCI_UNSPEC) {
here = eni_dev->vci+vcc->vci*16;
/* block receiver */
writel((readl(here) & ~MID_VCI_MODE) | (MID_MODE_TRASH <<
MID_VCI_MODE_SHIFT),here);
/* wait for receiver to become idle */
udelay(27);
/* discard pending cell */
writel(readl(here) & ~MID_VCI_IN_SERVICE,here);
/* don't accept any new ones */
eni_dev->rx_map[vcc->vci] = NULL;
/* wait for RX queue to drain */
DPRINTK("eni_close: waiting for RX ...\n");
EVENT("RX closing\n",0,0);
add_wait_queue(&eni_dev->rx_wait,&wait);
set_current_state(TASK_UNINTERRUPTIBLE);
barrier();
for (;;) {
/* transition service->rx: rxing++, servicing-- */
if (!eni_vcc->servicing) {
barrier();
if (!eni_vcc->rxing) break;
}
EVENT("drain PDUs (rx %ld, serv %ld)\n",eni_vcc->rxing,
eni_vcc->servicing);
printk(KERN_INFO "%d+%d RX left\n",eni_vcc->servicing,
eni_vcc->rxing);
schedule();
set_current_state(TASK_UNINTERRUPTIBLE);
}
for (;;) {
int at_end;
u32 tmp;
tasklet_disable(&eni_dev->task);
tmp = readl(eni_dev->vci+vcc->vci*16+4) & MID_VCI_READ;
at_end = eni_vcc->rx_pos == tmp >> MID_VCI_READ_SHIFT;
tasklet_enable(&eni_dev->task);
if (at_end) break;
EVENT("drain discard (host 0x%lx, nic 0x%lx)\n",
eni_vcc->rx_pos,tmp);
printk(KERN_INFO "draining RX: host 0x%lx, nic 0x%x\n",
eni_vcc->rx_pos,tmp);
schedule();
set_current_state(TASK_UNINTERRUPTIBLE);
}
set_current_state(TASK_RUNNING);
remove_wait_queue(&eni_dev->rx_wait,&wait);
}
eni_free_mem(eni_dev,eni_vcc->recv,eni_vcc->words << 2);
eni_vcc->rx = NULL;
}
static int start_rx(struct atm_dev *dev)
{
struct eni_dev *eni_dev;
eni_dev = ENI_DEV(dev);
eni_dev->rx_map = (struct atm_vcc **) get_zeroed_page(GFP_KERNEL);
if (!eni_dev->rx_map) {
printk(KERN_ERR DEV_LABEL "(itf %d): couldn't get free page\n",
dev->number);
free_page((unsigned long) eni_dev->free_list);
return -ENOMEM;
}
eni_dev->rx_mult = DEFAULT_RX_MULT;
eni_dev->fast = eni_dev->last_fast = NULL;
eni_dev->slow = eni_dev->last_slow = NULL;
init_waitqueue_head(&eni_dev->rx_wait);
skb_queue_head_init(&eni_dev->rx_queue);
eni_dev->serv_read = eni_in(MID_SERV_WRITE);
eni_out(0,MID_DMA_WR_RX);
return 0;
}
/*----------------------------------- TX ------------------------------------*/
enum enq_res { enq_ok,enq_next,enq_jam };
static inline void put_dma(int chan,u32 *dma,int *j,dma_addr_t paddr,
u32 size)
{
u32 init,words;
DPRINTK("put_dma: 0x%lx+0x%x\n",(unsigned long) paddr,size);
EVENT("put_dma: 0x%lx+0x%lx\n",(unsigned long) paddr,size);
#if 0 /* don't complain anymore */
if (paddr & 3)
printk(KERN_ERR "put_dma: unaligned addr (0x%lx)\n",paddr);
if (size & 3)
printk(KERN_ERR "put_dma: unaligned size (0x%lx)\n",size);
#endif
if (paddr & 3) {
init = 4-(paddr & 3);
if (init > size || size < 7) init = size;
DPRINTK("put_dma: %lx DMA: %d/%d bytes\n",
(unsigned long) paddr,init,size);
dma[(*j)++] = MID_DT_BYTE | (init << MID_DMA_COUNT_SHIFT) |
(chan << MID_DMA_CHAN_SHIFT);
dma[(*j)++] = paddr;
paddr += init;
size -= init;
}
words = size >> 2;
size &= 3;
if (words && (paddr & 31)) {
init = 8-((paddr & 31) >> 2);
if (init > words) init = words;
DPRINTK("put_dma: %lx DMA: %d/%d words\n",
(unsigned long) paddr,init,words);
dma[(*j)++] = MID_DT_WORD | (init << MID_DMA_COUNT_SHIFT) |
(chan << MID_DMA_CHAN_SHIFT);
dma[(*j)++] = paddr;
paddr += init << 2;
words -= init;
}
#ifdef CONFIG_ATM_ENI_BURST_TX_16W /* may work with some PCI chipsets ... */
if (words & ~15) {
DPRINTK("put_dma: %lx DMA: %d*16/%d words\n",
(unsigned long) paddr,words >> 4,words);
dma[(*j)++] = MID_DT_16W | ((words >> 4) << MID_DMA_COUNT_SHIFT)
| (chan << MID_DMA_CHAN_SHIFT);
dma[(*j)++] = paddr;
paddr += (words & ~15) << 2;
words &= 15;
}
#endif
#ifdef CONFIG_ATM_ENI_BURST_TX_8W /* recommended */
if (words & ~7) {
DPRINTK("put_dma: %lx DMA: %d*8/%d words\n",
(unsigned long) paddr,words >> 3,words);
dma[(*j)++] = MID_DT_8W | ((words >> 3) << MID_DMA_COUNT_SHIFT)
| (chan << MID_DMA_CHAN_SHIFT);
dma[(*j)++] = paddr;
paddr += (words & ~7) << 2;
words &= 7;
}
#endif
#ifdef CONFIG_ATM_ENI_BURST_TX_4W /* probably useless if TX_8W or TX_16W */
if (words & ~3) {
DPRINTK("put_dma: %lx DMA: %d*4/%d words\n",
(unsigned long) paddr,words >> 2,words);
dma[(*j)++] = MID_DT_4W | ((words >> 2) << MID_DMA_COUNT_SHIFT)
| (chan << MID_DMA_CHAN_SHIFT);
dma[(*j)++] = paddr;
paddr += (words & ~3) << 2;
words &= 3;
}
#endif
#ifdef CONFIG_ATM_ENI_BURST_TX_2W /* probably useless if TX_4W, TX_8W, ... */
if (words & ~1) {
DPRINTK("put_dma: %lx DMA: %d*2/%d words\n",