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linux/drivers/atm/eni.c
Jia-Ju Bai a45a9e8a76 atm: eni: avoid accessing the data mapped to streaming DMA 
In do_tx(), skb->data is mapped to streaming DMA on line 1111:
  paddr = dma_map_single(...,skb->data,DMA_TO_DEVICE);

Then skb->data is accessed on line 1153:
  (skb->data[3] & 0xf)

This access may cause data inconsistency between CPU cache and hardware.

To fix this problem, skb->data[3] is assigned to a local variable before
DMA mapping, and then the driver accesses this local variable instead of
skb->data[3].

Signed-off-by: Jia-Ju Bai <baijiaju@tsinghua.edu.cn>
Signed-off-by: David S. Miller <davem@davemloft.net>
2020-08-03 15:50:48 -07:00

2319 lines
61 KiB
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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",
(unsigned long) paddr,words >> 1,words);
dma[(*j)++] = MID_DT_2W | ((words >> 1) << MID_DMA_COUNT_SHIFT)
| (chan << MID_DMA_CHAN_SHIFT);
dma[(*j)++] = paddr;
paddr += (words & ~1) << 2;
words &= 1;
}
#endif
if (words) {
DPRINTK("put_dma: %lx DMA: %d words\n",(unsigned long) paddr,
words);
dma[(*j)++] = MID_DT_WORD | (words << MID_DMA_COUNT_SHIFT) |
(chan << MID_DMA_CHAN_SHIFT);
dma[(*j)++] = paddr;
paddr += words << 2;
}
if (size) {
DPRINTK("put_dma: %lx DMA: %d bytes\n",(unsigned long) paddr,
size);
dma[(*j)++] = MID_DT_BYTE | (size << MID_DMA_COUNT_SHIFT) |
(chan << MID_DMA_CHAN_SHIFT);
dma[(*j)++] = paddr;
}
}
static enum enq_res do_tx(struct sk_buff *skb)
{
struct atm_vcc *vcc;
struct eni_dev *eni_dev;
struct eni_vcc *eni_vcc;
struct eni_tx *tx;
dma_addr_t paddr;
u32 dma_rd,dma_wr;
u32 size; /* in words */
int aal5,dma_size,i,j;
unsigned char skb_data3;
DPRINTK(">do_tx\n");
NULLCHECK(skb);
EVENT("do_tx: skb=0x%lx, %ld bytes\n",(unsigned long) skb,skb->len);
vcc = ATM_SKB(skb)->vcc;
NULLCHECK(vcc);
eni_dev = ENI_DEV(vcc->dev);
NULLCHECK(eni_dev);
eni_vcc = ENI_VCC(vcc);
tx = eni_vcc->tx;
NULLCHECK(tx);
#if 0 /* Enable this for testing with the "align" program */
{
unsigned int hack = *((char *) skb->data)-'0';
if (hack < 8) {
skb->data += hack;
skb->len -= hack;
}
}
#endif
#if 0 /* should work now */
if ((unsigned long) skb->data & 3)
printk(KERN_ERR DEV_LABEL "(itf %d): VCI %d has mis-aligned "
"TX data\n",vcc->dev->number,vcc->vci);
#endif
/*
* Potential future IP speedup: make hard_header big enough to put
* segmentation descriptor directly into PDU. Saves: 4 slave writes,
* 1 DMA xfer & 2 DMA'ed bytes (protocol layering is for wimps :-)
*/
aal5 = vcc->qos.aal == ATM_AAL5;
/* check space in buffer */
if (!aal5)
size = (ATM_CELL_PAYLOAD >> 2)+TX_DESCR_SIZE;
/* cell without HEC plus segmentation header (includes
four-byte cell header) */
else {
size = skb->len+4*AAL5_TRAILER+ATM_CELL_PAYLOAD-1;
/* add AAL5 trailer */
size = ((size-(size % ATM_CELL_PAYLOAD)) >> 2)+TX_DESCR_SIZE;
/* add segmentation header */
}
/*
* Can I move tx_pos by size bytes without getting closer than TX_GAP
* to the read pointer ? TX_GAP means to leave some space for what
* the manual calls "too close".
*/
if (!NEPMOK(tx->tx_pos,size+TX_GAP,
eni_in(MID_TX_RDPTR(tx->index)),tx->words)) {
DPRINTK(DEV_LABEL "(itf %d): TX full (size %d)\n",
vcc->dev->number,size);
return enq_next;
}
/* check DMA */
dma_wr = eni_in(MID_DMA_WR_TX);
dma_rd = eni_in(MID_DMA_RD_TX);
dma_size = 3; /* JK for descriptor and final fill, plus final size
mis-alignment fix */
DPRINTK("iovcnt = %d\n",skb_shinfo(skb)->nr_frags);
if (!skb_shinfo(skb)->nr_frags) dma_size += 5;
else dma_size += 5*(skb_shinfo(skb)->nr_frags+1);
if (dma_size > TX_DMA_BUF) {
printk(KERN_CRIT DEV_LABEL "(itf %d): needs %d DMA entries "
"(got only %d)\n",vcc->dev->number,dma_size,TX_DMA_BUF);
}
DPRINTK("dma_wr is %d, tx_pos is %ld\n",dma_wr,tx->tx_pos);
if (dma_wr != dma_rd && ((dma_rd+NR_DMA_TX-dma_wr) & (NR_DMA_TX-1)) <
dma_size) {
printk(KERN_WARNING DEV_LABEL "(itf %d): TX DMA full\n",
vcc->dev->number);
return enq_jam;
}
skb_data3 = skb->data[3];
paddr = dma_map_single(&eni_dev->pci_dev->dev,skb->data,skb->len,
DMA_TO_DEVICE);
ENI_PRV_PADDR(skb) = paddr;
/* prepare DMA queue entries */
j = 0;
eni_dev->dma[j++] = (((tx->tx_pos+TX_DESCR_SIZE) & (tx->words-1)) <<
MID_DMA_COUNT_SHIFT) | (tx->index << MID_DMA_CHAN_SHIFT) |
MID_DT_JK;
j++;
if (!skb_shinfo(skb)->nr_frags)
if (aal5) put_dma(tx->index,eni_dev->dma,&j,paddr,skb->len);
else put_dma(tx->index,eni_dev->dma,&j,paddr+4,skb->len-4);
else {
DPRINTK("doing direct send\n"); /* @@@ well, this doesn't work anyway */
for (i = -1; i < skb_shinfo(skb)->nr_frags; i++)
if (i == -1)
put_dma(tx->index,eni_dev->dma,&j,(unsigned long)
skb->data,
skb_headlen(skb));
else
put_dma(tx->index,eni_dev->dma,&j,(unsigned long)
skb_frag_page(&skb_shinfo(skb)->frags[i]) +
skb_frag_off(&skb_shinfo(skb)->frags[i]),
skb_frag_size(&skb_shinfo(skb)->frags[i]));
}
if (skb->len & 3) {
put_dma(tx->index, eni_dev->dma, &j, eni_dev->zero.dma,
4 - (skb->len & 3));
}
/* JK for AAL5 trailer - AAL0 doesn't need it, but who cares ... */
eni_dev->dma[j++] = (((tx->tx_pos+size) & (tx->words-1)) <<
MID_DMA_COUNT_SHIFT) | (tx->index << MID_DMA_CHAN_SHIFT) |
MID_DMA_END | MID_DT_JK;
j++;
DPRINTK("DMA at end: %d\n",j);
/* store frame */
writel((MID_SEG_TX_ID << MID_SEG_ID_SHIFT) |
(aal5 ? MID_SEG_AAL5 : 0) | (tx->prescaler << MID_SEG_PR_SHIFT) |
(tx->resolution << MID_SEG_RATE_SHIFT) |
(size/(ATM_CELL_PAYLOAD/4)),tx->send+tx->tx_pos*4);
/*printk("dsc = 0x%08lx\n",(unsigned long) readl(tx->send+tx->tx_pos*4));*/
writel((vcc->vci << MID_SEG_VCI_SHIFT) |
(aal5 ? 0 : (skb_data3 & 0xf)) |
(ATM_SKB(skb)->atm_options & ATM_ATMOPT_CLP ? MID_SEG_CLP : 0),
tx->send+((tx->tx_pos+1) & (tx->words-1))*4);
DPRINTK("size: %d, len:%d\n",size,skb->len);
if (aal5)
writel(skb->len,tx->send+
((tx->tx_pos+size-AAL5_TRAILER) & (tx->words-1))*4);
j = j >> 1;
for (i = 0; i < j; i++) {
writel(eni_dev->dma[i*2],eni_dev->tx_dma+dma_wr*8);
writel(eni_dev->dma[i*2+1],eni_dev->tx_dma+dma_wr*8+4);
dma_wr = (dma_wr+1) & (NR_DMA_TX-1);
}
ENI_PRV_POS(skb) = tx->tx_pos;
ENI_PRV_SIZE(skb) = size;
ENI_VCC(vcc)->txing += size;
tx->tx_pos = (tx->tx_pos+size) & (tx->words-1);
DPRINTK("dma_wr set to %d, tx_pos is now %ld\n",dma_wr,tx->tx_pos);
eni_out(dma_wr,MID_DMA_WR_TX);
skb_queue_tail(&eni_dev->tx_queue,skb);
queued++;
return enq_ok;
}
static void poll_tx(struct atm_dev *dev)
{
struct eni_tx *tx;
struct sk_buff *skb;
enum enq_res res;
int i;
DPRINTK(">poll_tx\n");
for (i = NR_CHAN-1; i >= 0; i--) {
tx = &ENI_DEV(dev)->tx[i];
if (tx->send)
while ((skb = skb_dequeue(&tx->backlog))) {
res = do_tx(skb);
if (res == enq_ok) continue;
DPRINTK("re-queuing TX PDU\n");
skb_queue_head(&tx->backlog,skb);
requeued++;
if (res == enq_jam) return;
break;
}
}
}
static void dequeue_tx(struct atm_dev *dev)
{
struct eni_dev *eni_dev;
struct atm_vcc *vcc;
struct sk_buff *skb;
struct eni_tx *tx;
NULLCHECK(dev);
eni_dev = ENI_DEV(dev);
NULLCHECK(eni_dev);
while ((skb = skb_dequeue(&eni_dev->tx_queue))) {
vcc = ATM_SKB(skb)->vcc;
NULLCHECK(vcc);
tx = ENI_VCC(vcc)->tx;
NULLCHECK(ENI_VCC(vcc)->tx);
DPRINTK("dequeue_tx: next 0x%lx curr 0x%x\n",ENI_PRV_POS(skb),
(unsigned) eni_in(MID_TX_DESCRSTART(tx->index)));
if (ENI_VCC(vcc)->txing < tx->words && ENI_PRV_POS(skb) ==
eni_in(MID_TX_DESCRSTART(tx->index))) {
skb_queue_head(&eni_dev->tx_queue,skb);
break;
}
ENI_VCC(vcc)->txing -= ENI_PRV_SIZE(skb);
dma_unmap_single(&eni_dev->pci_dev->dev,ENI_PRV_PADDR(skb),skb->len,
DMA_TO_DEVICE);
if (vcc->pop) vcc->pop(vcc,skb);
else dev_kfree_skb_irq(skb);
atomic_inc(&vcc->stats->tx);
wake_up(&eni_dev->tx_wait);
dma_complete++;
}
}
static struct eni_tx *alloc_tx(struct eni_dev *eni_dev,int ubr)
{
int i;
for (i = !ubr; i < NR_CHAN; i++)
if (!eni_dev->tx[i].send) return eni_dev->tx+i;
return NULL;
}
static int comp_tx(struct eni_dev *eni_dev,int *pcr,int reserved,int *pre,
int *res,int unlimited)
{
static const int pre_div[] = { 4,16,128,2048 };
/* 2^(((x+2)^2-(x+2))/2+1) */
if (unlimited) *pre = *res = 0;
else {
if (*pcr > 0) {
int div;
for (*pre = 0; *pre < 3; (*pre)++)
if (TS_CLOCK/pre_div[*pre]/64 <= *pcr) break;
div = pre_div[*pre]**pcr;
DPRINTK("min div %d\n",div);
*res = TS_CLOCK/div-1;
}
else {
int div;
if (!*pcr) *pcr = eni_dev->tx_bw+reserved;
for (*pre = 3; *pre >= 0; (*pre)--)
if (TS_CLOCK/pre_div[*pre]/64 > -*pcr) break;
if (*pre < 3) (*pre)++; /* else fail later */
div = pre_div[*pre]*-*pcr;
DPRINTK("max div %d\n",div);
*res = DIV_ROUND_UP(TS_CLOCK, div)-1;
}
if (*res < 0) *res = 0;
if (*res > MID_SEG_MAX_RATE) *res = MID_SEG_MAX_RATE;
}
*pcr = TS_CLOCK/pre_div[*pre]/(*res+1);
DPRINTK("out pcr: %d (%d:%d)\n",*pcr,*pre,*res);
return 0;
}
static int reserve_or_set_tx(struct atm_vcc *vcc,struct atm_trafprm *txtp,
int set_rsv,int set_shp)
{
struct eni_dev *eni_dev = ENI_DEV(vcc->dev);
struct eni_vcc *eni_vcc = ENI_VCC(vcc);
struct eni_tx *tx;
unsigned long size;
void __iomem *mem;
int rate,ubr,unlimited,new_tx;
int pre,res,order;
int error;
rate = atm_pcr_goal(txtp);
ubr = txtp->traffic_class == ATM_UBR;
unlimited = ubr && (!rate || rate <= -ATM_OC3_PCR ||
rate >= ATM_OC3_PCR);
if (!unlimited) {
size = txtp->max_sdu*eni_dev->tx_mult/100;
if (size > MID_MAX_BUF_SIZE && txtp->max_sdu <=
MID_MAX_BUF_SIZE)
size = MID_MAX_BUF_SIZE;
}
else {
if (eni_dev->ubr) {
eni_vcc->tx = eni_dev->ubr;
txtp->pcr = ATM_OC3_PCR;
return 0;
}
size = UBR_BUFFER;
}
new_tx = !eni_vcc->tx;
mem = NULL; /* for gcc */
if (!new_tx) tx = eni_vcc->tx;
else {
mem = eni_alloc_mem(eni_dev,&size);
if (!mem) return -ENOBUFS;
tx = alloc_tx(eni_dev,unlimited);
if (!tx) {
eni_free_mem(eni_dev,mem,size);
return -EBUSY;
}
DPRINTK("got chan %d\n",tx->index);
tx->reserved = tx->shaping = 0;
tx->send = mem;
tx->words = size >> 2;
skb_queue_head_init(&tx->backlog);
for (order = 0; size > (1 << (order+10)); order++);
eni_out((order << MID_SIZE_SHIFT) |
((tx->send-eni_dev->ram) >> (MID_LOC_SKIP+2)),
MID_TX_PLACE(tx->index));
tx->tx_pos = eni_in(MID_TX_DESCRSTART(tx->index)) &
MID_DESCR_START;
}
error = comp_tx(eni_dev,&rate,tx->reserved,&pre,&res,unlimited);
if (!error && txtp->min_pcr > rate) error = -EINVAL;
if (!error && txtp->max_pcr && txtp->max_pcr != ATM_MAX_PCR &&
txtp->max_pcr < rate) error = -EINVAL;
if (!error && !ubr && rate > eni_dev->tx_bw+tx->reserved)
error = -EINVAL;
if (!error && set_rsv && !set_shp && rate < tx->shaping)
error = -EINVAL;
if (!error && !set_rsv && rate > tx->reserved && !ubr)
error = -EINVAL;
if (error) {
if (new_tx) {
tx->send = NULL;
eni_free_mem(eni_dev,mem,size);
}
return error;
}
txtp->pcr = rate;
if (set_rsv && !ubr) {
eni_dev->tx_bw += tx->reserved;
tx->reserved = rate;
eni_dev->tx_bw -= rate;
}
if (set_shp || (unlimited && new_tx)) {
if (unlimited && new_tx) eni_dev->ubr = tx;
tx->prescaler = pre;
tx->resolution = res;
tx->shaping = rate;
}
if (set_shp) eni_vcc->tx = tx;
DPRINTK("rsv %d shp %d\n",tx->reserved,tx->shaping);
return 0;
}
static int open_tx_first(struct atm_vcc *vcc)
{
ENI_VCC(vcc)->tx = NULL;
if (vcc->qos.txtp.traffic_class == ATM_NONE) return 0;
ENI_VCC(vcc)->txing = 0;
return reserve_or_set_tx(vcc,&vcc->qos.txtp,1,1);
}
static int open_tx_second(struct atm_vcc *vcc)
{
return 0; /* nothing to do */
}
static void close_tx(struct atm_vcc *vcc)
{
DECLARE_WAITQUEUE(wait,current);
struct eni_dev *eni_dev;
struct eni_vcc *eni_vcc;
eni_vcc = ENI_VCC(vcc);
if (!eni_vcc->tx) return;
eni_dev = ENI_DEV(vcc->dev);
/* wait for TX queue to drain */
DPRINTK("eni_close: waiting for TX ...\n");
add_wait_queue(&eni_dev->tx_wait,&wait);
set_current_state(TASK_UNINTERRUPTIBLE);
for (;;) {
int txing;
tasklet_disable(&eni_dev->task);
txing = skb_peek(&eni_vcc->tx->backlog) || eni_vcc->txing;
tasklet_enable(&eni_dev->task);
if (!txing) break;
DPRINTK("%d TX left\n",eni_vcc->txing);
schedule();
set_current_state(TASK_UNINTERRUPTIBLE);
}
set_current_state(TASK_RUNNING);
remove_wait_queue(&eni_dev->tx_wait,&wait);
if (eni_vcc->tx != eni_dev->ubr) {
/*
* Looping a few times in here is probably far cheaper than
* keeping track of TX completions all the time, so let's poll
* a bit ...
*/
while (eni_in(MID_TX_RDPTR(eni_vcc->tx->index)) !=
eni_in(MID_TX_DESCRSTART(eni_vcc->tx->index)))
schedule();
eni_free_mem(eni_dev,eni_vcc->tx->send,eni_vcc->tx->words << 2);
eni_vcc->tx->send = NULL;
eni_dev->tx_bw += eni_vcc->tx->reserved;
}
eni_vcc->tx = NULL;
}
static int start_tx(struct atm_dev *dev)
{
struct eni_dev *eni_dev;
int i;
eni_dev = ENI_DEV(dev);
eni_dev->lost = 0;
eni_dev->tx_bw = ATM_OC3_PCR;
eni_dev->tx_mult = DEFAULT_TX_MULT;
init_waitqueue_head(&eni_dev->tx_wait);
eni_dev->ubr = NULL;
skb_queue_head_init(&eni_dev->tx_queue);
eni_out(0,MID_DMA_WR_TX);
for (i = 0; i < NR_CHAN; i++) {
eni_dev->tx[i].send = NULL;
eni_dev->tx[i].index = i;
}
return 0;
}
/*--------------------------------- common ----------------------------------*/
#if 0 /* may become useful again when tuning things */
static void foo(void)
{
printk(KERN_INFO
"tx_complete=%d,dma_complete=%d,queued=%d,requeued=%d,sub=%d,\n"
"backlogged=%d,rx_enqueued=%d,rx_dequeued=%d,putting=%d,pushed=%d\n",
tx_complete,dma_complete,queued,requeued,submitted,backlogged,
rx_enqueued,rx_dequeued,putting,pushed);
if (eni_boards) printk(KERN_INFO "loss: %ld\n",ENI_DEV(eni_boards)->lost);
}
#endif
static void bug_int(struct atm_dev *dev,unsigned long reason)
{
DPRINTK(">bug_int\n");
if (reason & MID_DMA_ERR_ACK)
printk(KERN_CRIT DEV_LABEL "(itf %d): driver error - DMA "
"error\n",dev->number);
if (reason & MID_TX_IDENT_MISM)
printk(KERN_CRIT DEV_LABEL "(itf %d): driver error - ident "
"mismatch\n",dev->number);
if (reason & MID_TX_DMA_OVFL)
printk(KERN_CRIT DEV_LABEL "(itf %d): driver error - DMA "
"overflow\n",dev->number);
EVENT("---dump ends here---\n",0,0);
printk(KERN_NOTICE "---recent events---\n");
event_dump();
}
static irqreturn_t eni_int(int irq,void *dev_id)
{
struct atm_dev *dev;
struct eni_dev *eni_dev;
u32 reason;
DPRINTK(">eni_int\n");
dev = dev_id;
eni_dev = ENI_DEV(dev);
reason = eni_in(MID_ISA);
DPRINTK(DEV_LABEL ": int 0x%lx\n",(unsigned long) reason);
/*
* Must handle these two right now, because reading ISA doesn't clear
* them, so they re-occur and we never make it to the tasklet. Since
* they're rare, we don't mind the occasional invocation of eni_tasklet
* with eni_dev->events == 0.
*/
if (reason & MID_STAT_OVFL) {
EVENT("stat overflow\n",0,0);
eni_dev->lost += eni_in(MID_STAT) & MID_OVFL_TRASH;
}
if (reason & MID_SUNI_INT) {
EVENT("SUNI int\n",0,0);
dev->phy->interrupt(dev);
#if 0
foo();
#endif
}
spin_lock(&eni_dev->lock);
eni_dev->events |= reason;
spin_unlock(&eni_dev->lock);
tasklet_schedule(&eni_dev->task);
return IRQ_HANDLED;
}
static void eni_tasklet(unsigned long data)
{
struct atm_dev *dev = (struct atm_dev *) data;
struct eni_dev *eni_dev = ENI_DEV(dev);
unsigned long flags;
u32 events;
DPRINTK("eni_tasklet (dev %p)\n",dev);
spin_lock_irqsave(&eni_dev->lock,flags);
events = xchg(&eni_dev->events,0);
spin_unlock_irqrestore(&eni_dev->lock,flags);
if (events & MID_RX_DMA_COMPLETE) {
EVENT("INT: RX DMA complete, starting dequeue_rx\n",0,0);
dequeue_rx(dev);
EVENT("dequeue_rx done, starting poll_rx\n",0,0);
poll_rx(dev);
EVENT("poll_rx done\n",0,0);
/* poll_tx ? */
}
if (events & MID_SERVICE) {
EVENT("INT: service, starting get_service\n",0,0);
get_service(dev);
EVENT("get_service done, starting poll_rx\n",0,0);
poll_rx(dev);
EVENT("poll_rx done\n",0,0);
}
if (events & MID_TX_DMA_COMPLETE) {
EVENT("INT: TX DMA COMPLETE\n",0,0);
dequeue_tx(dev);
}
if (events & MID_TX_COMPLETE) {
EVENT("INT: TX COMPLETE\n",0,0);
tx_complete++;
wake_up(&eni_dev->tx_wait);
/* poll_rx ? */
}
if (events & (MID_DMA_ERR_ACK | MID_TX_IDENT_MISM | MID_TX_DMA_OVFL)) {
EVENT("bug interrupt\n",0,0);
bug_int(dev,events);
}
poll_tx(dev);
}
/*--------------------------------- entries ---------------------------------*/
static char * const media_name[] = {
"MMF", "SMF", "MMF", "03?", /* 0- 3 */
"UTP", "05?", "06?", "07?", /* 4- 7 */
"TAXI","09?", "10?", "11?", /* 8-11 */
"12?", "13?", "14?", "15?", /* 12-15 */
"MMF", "SMF", "18?", "19?", /* 16-19 */
"UTP", "21?", "22?", "23?", /* 20-23 */
"24?", "25?", "26?", "27?", /* 24-27 */
"28?", "29?", "30?", "31?" /* 28-31 */
};
#define SET_SEPROM \
({ if (!error && !pci_error) { \
pci_error = pci_write_config_byte(eni_dev->pci_dev,PCI_TONGA_CTRL,tonga); \
udelay(10); /* 10 usecs */ \
} })
#define GET_SEPROM \
({ if (!error && !pci_error) { \
pci_error = pci_read_config_byte(eni_dev->pci_dev,PCI_TONGA_CTRL,&tonga); \
udelay(10); /* 10 usecs */ \
} })
static int get_esi_asic(struct atm_dev *dev)
{
struct eni_dev *eni_dev;
unsigned char tonga;
int error,failed,pci_error;
int address,i,j;
eni_dev = ENI_DEV(dev);
error = pci_error = 0;
tonga = SEPROM_MAGIC | SEPROM_DATA | SEPROM_CLK;
SET_SEPROM;
for (i = 0; i < ESI_LEN && !error && !pci_error; i++) {
/* start operation */
tonga |= SEPROM_DATA;
SET_SEPROM;
tonga |= SEPROM_CLK;
SET_SEPROM;
tonga &= ~SEPROM_DATA;
SET_SEPROM;
tonga &= ~SEPROM_CLK;
SET_SEPROM;
/* send address */
address = ((i+SEPROM_ESI_BASE) << 1)+1;
for (j = 7; j >= 0; j--) {
tonga = (address >> j) & 1 ? tonga | SEPROM_DATA :
tonga & ~SEPROM_DATA;
SET_SEPROM;
tonga |= SEPROM_CLK;
SET_SEPROM;
tonga &= ~SEPROM_CLK;
SET_SEPROM;
}
/* get ack */
tonga |= SEPROM_DATA;
SET_SEPROM;
tonga |= SEPROM_CLK;
SET_SEPROM;
GET_SEPROM;
failed = tonga & SEPROM_DATA;
tonga &= ~SEPROM_CLK;
SET_SEPROM;
tonga |= SEPROM_DATA;
SET_SEPROM;
if (failed) error = -EIO;
else {
dev->esi[i] = 0;
for (j = 7; j >= 0; j--) {
dev->esi[i] <<= 1;
tonga |= SEPROM_DATA;
SET_SEPROM;
tonga |= SEPROM_CLK;
SET_SEPROM;
GET_SEPROM;
if (tonga & SEPROM_DATA) dev->esi[i] |= 1;
tonga &= ~SEPROM_CLK;
SET_SEPROM;
tonga |= SEPROM_DATA;
SET_SEPROM;
}
/* get ack */
tonga |= SEPROM_DATA;
SET_SEPROM;
tonga |= SEPROM_CLK;
SET_SEPROM;
GET_SEPROM;
if (!(tonga & SEPROM_DATA)) error = -EIO;
tonga &= ~SEPROM_CLK;
SET_SEPROM;
tonga |= SEPROM_DATA;
SET_SEPROM;
}
/* stop operation */
tonga &= ~SEPROM_DATA;
SET_SEPROM;
tonga |= SEPROM_CLK;
SET_SEPROM;
tonga |= SEPROM_DATA;
SET_SEPROM;
}
if (pci_error) {
printk(KERN_ERR DEV_LABEL "(itf %d): error reading ESI "
"(0x%02x)\n",dev->number,pci_error);
error = -EIO;
}
return error;
}
#undef SET_SEPROM
#undef GET_SEPROM
static int get_esi_fpga(struct atm_dev *dev, void __iomem *base)
{
void __iomem *mac_base;
int i;
mac_base = base+EPROM_SIZE-sizeof(struct midway_eprom);
for (i = 0; i < ESI_LEN; i++) dev->esi[i] = readb(mac_base+(i^3));
return 0;
}
static int eni_do_init(struct atm_dev *dev)
{
struct midway_eprom __iomem *eprom;
struct eni_dev *eni_dev;
struct pci_dev *pci_dev;
unsigned long real_base;
void __iomem *base;
int error,i,last;
DPRINTK(">eni_init\n");
dev->ci_range.vpi_bits = 0;
dev->ci_range.vci_bits = NR_VCI_LD;
dev->link_rate = ATM_OC3_PCR;
eni_dev = ENI_DEV(dev);
pci_dev = eni_dev->pci_dev;
real_base = pci_resource_start(pci_dev, 0);
eni_dev->irq = pci_dev->irq;
if ((error = pci_write_config_word(pci_dev,PCI_COMMAND,
PCI_COMMAND_MEMORY |
(eni_dev->asic ? PCI_COMMAND_PARITY | PCI_COMMAND_SERR : 0)))) {
printk(KERN_ERR DEV_LABEL "(itf %d): can't enable memory "
"(0x%02x)\n",dev->number,error);
return -EIO;
}
printk(KERN_NOTICE DEV_LABEL "(itf %d): rev.%d,base=0x%lx,irq=%d,",
dev->number,pci_dev->revision,real_base,eni_dev->irq);
if (!(base = ioremap(real_base,MAP_MAX_SIZE))) {
printk("\n");
printk(KERN_ERR DEV_LABEL "(itf %d): can't set up page "
"mapping\n",dev->number);
return -ENOMEM;
}
eni_dev->ioaddr = base;
eni_dev->base_diff = real_base - (unsigned long) base;
/* id may not be present in ASIC Tonga boards - check this @@@ */
if (!eni_dev->asic) {
eprom = (base+EPROM_SIZE-sizeof(struct midway_eprom));
if (readl(&eprom->magic) != ENI155_MAGIC) {
printk("\n");
printk(KERN_ERR DEV_LABEL
"(itf %d): bad magic - expected 0x%x, got 0x%x\n",
dev->number, ENI155_MAGIC,
(unsigned)readl(&eprom->magic));
error = -EINVAL;
goto unmap;
}
}
eni_dev->phy = base+PHY_BASE;
eni_dev->reg = base+REG_BASE;
eni_dev->ram = base+RAM_BASE;
last = MAP_MAX_SIZE-RAM_BASE;
for (i = last-RAM_INCREMENT; i >= 0; i -= RAM_INCREMENT) {
writel(0x55555555,eni_dev->ram+i);
if (readl(eni_dev->ram+i) != 0x55555555) last = i;
else {
writel(0xAAAAAAAA,eni_dev->ram+i);
if (readl(eni_dev->ram+i) != 0xAAAAAAAA) last = i;
else writel(i,eni_dev->ram+i);
}
}
for (i = 0; i < last; i += RAM_INCREMENT)
if (readl(eni_dev->ram+i) != i) break;
eni_dev->mem = i;
memset_io(eni_dev->ram,0,eni_dev->mem);
/* TODO: should shrink allocation now */
printk("mem=%dkB (",eni_dev->mem >> 10);
/* TODO: check for non-SUNI, check for TAXI ? */
if (!(eni_in(MID_RES_ID_MCON) & 0x200) != !eni_dev->asic) {
printk(")\n");
printk(KERN_ERR DEV_LABEL "(itf %d): ERROR - wrong id 0x%x\n",
dev->number,(unsigned) eni_in(MID_RES_ID_MCON));
error = -EINVAL;
goto unmap;
}
error = eni_dev->asic ? get_esi_asic(dev) : get_esi_fpga(dev,base);
if (error)
goto unmap;
for (i = 0; i < ESI_LEN; i++)
printk("%s%02X",i ? "-" : "",dev->esi[i]);
printk(")\n");
printk(KERN_NOTICE DEV_LABEL "(itf %d): %s,%s\n",dev->number,
eni_in(MID_RES_ID_MCON) & 0x200 ? "ASIC" : "FPGA",
media_name[eni_in(MID_RES_ID_MCON) & DAUGHTER_ID]);
error = suni_init(dev);
if (error)
goto unmap;
out:
return error;
unmap:
iounmap(base);
goto out;
}
static void eni_do_release(struct atm_dev *dev)
{
struct eni_dev *ed = ENI_DEV(dev);
dev->phy->stop(dev);
dev->phy = NULL;
iounmap(ed->ioaddr);
}
static int eni_start(struct atm_dev *dev)
{
struct eni_dev *eni_dev;
void __iomem *buf;
unsigned long buffer_mem;
int error;
DPRINTK(">eni_start\n");
eni_dev = ENI_DEV(dev);
if (request_irq(eni_dev->irq,&eni_int,IRQF_SHARED,DEV_LABEL,dev)) {
printk(KERN_ERR DEV_LABEL "(itf %d): IRQ%d is already in use\n",
dev->number,eni_dev->irq);
error = -EAGAIN;
goto out;
}
pci_set_master(eni_dev->pci_dev);
if ((error = pci_write_config_word(eni_dev->pci_dev,PCI_COMMAND,
PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER |
(eni_dev->asic ? PCI_COMMAND_PARITY | PCI_COMMAND_SERR : 0)))) {
printk(KERN_ERR DEV_LABEL "(itf %d): can't enable memory+"
"master (0x%02x)\n",dev->number,error);
goto free_irq;
}
if ((error = pci_write_config_byte(eni_dev->pci_dev,PCI_TONGA_CTRL,
END_SWAP_DMA))) {
printk(KERN_ERR DEV_LABEL "(itf %d): can't set endian swap "
"(0x%02x)\n",dev->number,error);
goto free_irq;
}
/* determine addresses of internal tables */
eni_dev->vci = eni_dev->ram;
eni_dev->rx_dma = eni_dev->ram+NR_VCI*16;
eni_dev->tx_dma = eni_dev->rx_dma+NR_DMA_RX*8;
eni_dev->service = eni_dev->tx_dma+NR_DMA_TX*8;
buf = eni_dev->service+NR_SERVICE*4;
DPRINTK("vci 0x%lx,rx 0x%lx, tx 0x%lx,srv 0x%lx,buf 0x%lx\n",
eni_dev->vci,eni_dev->rx_dma,eni_dev->tx_dma,
eni_dev->service,buf);
spin_lock_init(&eni_dev->lock);
tasklet_init(&eni_dev->task,eni_tasklet,(unsigned long) dev);
eni_dev->events = 0;
/* initialize memory management */
buffer_mem = eni_dev->mem - (buf - eni_dev->ram);
eni_dev->free_list_size = buffer_mem/MID_MIN_BUF_SIZE/2;
eni_dev->free_list = kmalloc_array(eni_dev->free_list_size + 1,
sizeof(*eni_dev->free_list),
GFP_KERNEL);
if (!eni_dev->free_list) {
printk(KERN_ERR DEV_LABEL "(itf %d): couldn't get free page\n",
dev->number);
error = -ENOMEM;
goto free_irq;
}
eni_dev->free_len = 0;
eni_put_free(eni_dev,buf,buffer_mem);
memset_io(eni_dev->vci,0,16*NR_VCI); /* clear VCI table */
/*
* byte_addr free (k)
* 0x00000000 512 VCI table
* 0x00004000 496 RX DMA
* 0x00005000 492 TX DMA
* 0x00006000 488 service list
* 0x00007000 484 buffers
* 0x00080000 0 end (512kB)
*/
eni_out(0xffffffff,MID_IE);
error = start_tx(dev);
if (error) goto free_list;
error = start_rx(dev);
if (error) goto free_list;
error = dev->phy->start(dev);
if (error) goto free_list;
eni_out(eni_in(MID_MC_S) | (1 << MID_INT_SEL_SHIFT) |
MID_TX_LOCK_MODE | MID_DMA_ENABLE | MID_TX_ENABLE | MID_RX_ENABLE,
MID_MC_S);
/* Tonga uses SBus INTReq1 */
(void) eni_in(MID_ISA); /* clear Midway interrupts */
return 0;
free_list:
kfree(eni_dev->free_list);
free_irq:
free_irq(eni_dev->irq, dev);
out:
return error;
}
static void eni_close(struct atm_vcc *vcc)
{
DPRINTK(">eni_close\n");
if (!ENI_VCC(vcc)) return;
clear_bit(ATM_VF_READY,&vcc->flags);
close_rx(vcc);
close_tx(vcc);
DPRINTK("eni_close: done waiting\n");
/* deallocate memory */
kfree(ENI_VCC(vcc));
vcc->dev_data = NULL;
clear_bit(ATM_VF_ADDR,&vcc->flags);
/*foo();*/
}
static int eni_open(struct atm_vcc *vcc)
{
struct eni_vcc *eni_vcc;
int error;
short vpi = vcc->vpi;
int vci = vcc->vci;
DPRINTK(">eni_open\n");
EVENT("eni_open\n",0,0);
if (!test_bit(ATM_VF_PARTIAL,&vcc->flags))
vcc->dev_data = NULL;
if (vci != ATM_VPI_UNSPEC && vpi != ATM_VCI_UNSPEC)
set_bit(ATM_VF_ADDR,&vcc->flags);
if (vcc->qos.aal != ATM_AAL0 && vcc->qos.aal != ATM_AAL5)
return -EINVAL;
DPRINTK(DEV_LABEL "(itf %d): open %d.%d\n",vcc->dev->number,vcc->vpi,
vcc->vci);
if (!test_bit(ATM_VF_PARTIAL,&vcc->flags)) {
eni_vcc = kmalloc(sizeof(struct eni_vcc),GFP_KERNEL);
if (!eni_vcc) return -ENOMEM;
vcc->dev_data = eni_vcc;
eni_vcc->tx = NULL; /* for eni_close after open_rx */
if ((error = open_rx_first(vcc))) {
eni_close(vcc);
return error;
}
if ((error = open_tx_first(vcc))) {
eni_close(vcc);
return error;
}
}
if (vci == ATM_VPI_UNSPEC || vpi == ATM_VCI_UNSPEC) return 0;
if ((error = open_rx_second(vcc))) {
eni_close(vcc);
return error;
}
if ((error = open_tx_second(vcc))) {
eni_close(vcc);
return error;
}
set_bit(ATM_VF_READY,&vcc->flags);
/* should power down SUNI while !ref_count @@@ */
return 0;
}
static int eni_change_qos(struct atm_vcc *vcc,struct atm_qos *qos,int flgs)
{
struct eni_dev *eni_dev = ENI_DEV(vcc->dev);
struct eni_tx *tx = ENI_VCC(vcc)->tx;
struct sk_buff *skb;
int error,rate,rsv,shp;
if (qos->txtp.traffic_class == ATM_NONE) return 0;
if (tx == eni_dev->ubr) return -EBADFD;
rate = atm_pcr_goal(&qos->txtp);
if (rate < 0) rate = -rate;
rsv = shp = 0;
if ((flgs & ATM_MF_DEC_RSV) && rate && rate < tx->reserved) rsv = 1;
if ((flgs & ATM_MF_INC_RSV) && (!rate || rate > tx->reserved)) rsv = 1;
if ((flgs & ATM_MF_DEC_SHP) && rate && rate < tx->shaping) shp = 1;
if ((flgs & ATM_MF_INC_SHP) && (!rate || rate > tx->shaping)) shp = 1;
if (!rsv && !shp) return 0;
error = reserve_or_set_tx(vcc,&qos->txtp,rsv,shp);
if (error) return error;
if (shp && !(flgs & ATM_MF_IMMED)) return 0;
/*
* Walk through the send buffer and patch the rate information in all
* segmentation buffer descriptors of this VCC.
*/
tasklet_disable(&eni_dev->task);
skb_queue_walk(&eni_dev->tx_queue, skb) {
void __iomem *dsc;
if (ATM_SKB(skb)->vcc != vcc) continue;
dsc = tx->send+ENI_PRV_POS(skb)*4;
writel((readl(dsc) & ~(MID_SEG_RATE | MID_SEG_PR)) |
(tx->prescaler << MID_SEG_PR_SHIFT) |
(tx->resolution << MID_SEG_RATE_SHIFT), dsc);
}
tasklet_enable(&eni_dev->task);
return 0;
}
static int eni_ioctl(struct atm_dev *dev,unsigned int cmd,void __user *arg)
{
struct eni_dev *eni_dev = ENI_DEV(dev);
if (cmd == ENI_MEMDUMP) {
if (!capable(CAP_NET_ADMIN)) return -EPERM;
printk(KERN_WARNING "Please use /proc/atm/" DEV_LABEL ":%d "
"instead of obsolete ioctl ENI_MEMDUMP\n",dev->number);
dump(dev);
return 0;
}
if (cmd == ENI_SETMULT) {
struct eni_multipliers mult;
if (!capable(CAP_NET_ADMIN)) return -EPERM;
if (copy_from_user(&mult, arg,
sizeof(struct eni_multipliers)))
return -EFAULT;
if ((mult.tx && mult.tx <= 100) || (mult.rx &&mult.rx <= 100) ||
mult.tx > 65536 || mult.rx > 65536)
return -EINVAL;
if (mult.tx) eni_dev->tx_mult = mult.tx;
if (mult.rx) eni_dev->rx_mult = mult.rx;
return 0;
}
if (cmd == ATM_SETCIRANGE) {
struct atm_cirange ci;
if (copy_from_user(&ci, arg,sizeof(struct atm_cirange)))
return -EFAULT;
if ((ci.vpi_bits == 0 || ci.vpi_bits == ATM_CI_MAX) &&
(ci.vci_bits == NR_VCI_LD || ci.vpi_bits == ATM_CI_MAX))
return 0;
return -EINVAL;
}
if (!dev->phy->ioctl) return -ENOIOCTLCMD;
return dev->phy->ioctl(dev,cmd,arg);
}
static int eni_send(struct atm_vcc *vcc,struct sk_buff *skb)
{
enum enq_res res;
DPRINTK(">eni_send\n");
if (!ENI_VCC(vcc)->tx) {
if (vcc->pop) vcc->pop(vcc,skb);
else dev_kfree_skb(skb);
return -EINVAL;
}
if (!skb) {
printk(KERN_CRIT "!skb in eni_send ?\n");
if (vcc->pop) vcc->pop(vcc,skb);
return -EINVAL;
}
if (vcc->qos.aal == ATM_AAL0) {
if (skb->len != ATM_CELL_SIZE-1) {
if (vcc->pop) vcc->pop(vcc,skb);
else dev_kfree_skb(skb);
return -EINVAL;
}
*(u32 *) skb->data = htonl(*(u32 *) skb->data);
}
submitted++;
ATM_SKB(skb)->vcc = vcc;
tasklet_disable(&ENI_DEV(vcc->dev)->task);
res = do_tx(skb);
tasklet_enable(&ENI_DEV(vcc->dev)->task);
if (res == enq_ok) return 0;
skb_queue_tail(&ENI_VCC(vcc)->tx->backlog,skb);
backlogged++;
tasklet_schedule(&ENI_DEV(vcc->dev)->task);
return 0;
}
static void eni_phy_put(struct atm_dev *dev,unsigned char value,
unsigned long addr)
{
writel(value,ENI_DEV(dev)->phy+addr*4);
}
static unsigned char eni_phy_get(struct atm_dev *dev,unsigned long addr)
{
return readl(ENI_DEV(dev)->phy+addr*4);
}
static int eni_proc_read(struct atm_dev *dev,loff_t *pos,char *page)
{
struct sock *s;
static const char *signal[] = { "LOST","unknown","okay" };
struct eni_dev *eni_dev = ENI_DEV(dev);
struct atm_vcc *vcc;
int left,i;
left = *pos;
if (!left)
return sprintf(page,DEV_LABEL "(itf %d) signal %s, %dkB, "
"%d cps remaining\n",dev->number,signal[(int) dev->signal],
eni_dev->mem >> 10,eni_dev->tx_bw);
if (!--left)
return sprintf(page,"%4sBursts: TX"
#if !defined(CONFIG_ATM_ENI_BURST_TX_16W) && \
!defined(CONFIG_ATM_ENI_BURST_TX_8W) && \
!defined(CONFIG_ATM_ENI_BURST_TX_4W) && \
!defined(CONFIG_ATM_ENI_BURST_TX_2W)
" none"
#endif
#ifdef CONFIG_ATM_ENI_BURST_TX_16W
" 16W"
#endif
#ifdef CONFIG_ATM_ENI_BURST_TX_8W
" 8W"
#endif
#ifdef CONFIG_ATM_ENI_BURST_TX_4W
" 4W"
#endif
#ifdef CONFIG_ATM_ENI_BURST_TX_2W
" 2W"
#endif
", RX"
#if !defined(CONFIG_ATM_ENI_BURST_RX_16W) && \
!defined(CONFIG_ATM_ENI_BURST_RX_8W) && \
!defined(CONFIG_ATM_ENI_BURST_RX_4W) && \
!defined(CONFIG_ATM_ENI_BURST_RX_2W)
" none"
#endif
#ifdef CONFIG_ATM_ENI_BURST_RX_16W
" 16W"
#endif
#ifdef CONFIG_ATM_ENI_BURST_RX_8W
" 8W"
#endif
#ifdef CONFIG_ATM_ENI_BURST_RX_4W
" 4W"
#endif
#ifdef CONFIG_ATM_ENI_BURST_RX_2W
" 2W"
#endif
#ifndef CONFIG_ATM_ENI_TUNE_BURST
" (default)"
#endif
"\n","");
if (!--left)
return sprintf(page,"%4sBuffer multipliers: tx %d%%, rx %d%%\n",
"",eni_dev->tx_mult,eni_dev->rx_mult);
for (i = 0; i < NR_CHAN; i++) {
struct eni_tx *tx = eni_dev->tx+i;
if (!tx->send) continue;
if (!--left) {
return sprintf(page, "tx[%d]: 0x%lx-0x%lx "
"(%6ld bytes), rsv %d cps, shp %d cps%s\n",i,
(unsigned long) (tx->send - eni_dev->ram),
tx->send-eni_dev->ram+tx->words*4-1,tx->words*4,
tx->reserved,tx->shaping,
tx == eni_dev->ubr ? " (UBR)" : "");
}
if (--left) continue;
return sprintf(page,"%10sbacklog %u packets\n","",
skb_queue_len(&tx->backlog));
}
read_lock(&vcc_sklist_lock);
for(i = 0; i < VCC_HTABLE_SIZE; ++i) {
struct hlist_head *head = &vcc_hash[i];
sk_for_each(s, head) {
struct eni_vcc *eni_vcc;
int length;
vcc = atm_sk(s);
if (vcc->dev != dev)
continue;
eni_vcc = ENI_VCC(vcc);
if (--left) continue;
length = sprintf(page,"vcc %4d: ",vcc->vci);
if (eni_vcc->rx) {
length += sprintf(page+length, "0x%lx-0x%lx "
"(%6ld bytes)",
(unsigned long) (eni_vcc->recv - eni_dev->ram),
eni_vcc->recv-eni_dev->ram+eni_vcc->words*4-1,
eni_vcc->words*4);
if (eni_vcc->tx) length += sprintf(page+length,", ");
}
if (eni_vcc->tx)
length += sprintf(page+length,"tx[%d], txing %d bytes",
eni_vcc->tx->index,eni_vcc->txing);
page[length] = '\n';
read_unlock(&vcc_sklist_lock);
return length+1;
}
}
read_unlock(&vcc_sklist_lock);
for (i = 0; i < eni_dev->free_len; i++) {
struct eni_free *fe = eni_dev->free_list+i;
unsigned long offset;
if (--left) continue;
offset = (unsigned long) eni_dev->ram+eni_dev->base_diff;
return sprintf(page,"free %p-%p (%6d bytes)\n",
fe->start-offset,fe->start-offset+(1 << fe->order)-1,
1 << fe->order);
}
return 0;
}
static const struct atmdev_ops ops = {
.open = eni_open,
.close = eni_close,
.ioctl = eni_ioctl,
.send = eni_send,
.phy_put = eni_phy_put,
.phy_get = eni_phy_get,
.change_qos = eni_change_qos,
.proc_read = eni_proc_read
};
static int eni_init_one(struct pci_dev *pci_dev,
const struct pci_device_id *ent)
{
struct atm_dev *dev;
struct eni_dev *eni_dev;
struct eni_zero *zero;
int rc;
rc = pci_enable_device(pci_dev);
if (rc < 0)
goto out;
rc = dma_set_mask_and_coherent(&pci_dev->dev, DMA_BIT_MASK(32));
if (rc < 0)
goto out;
rc = -ENOMEM;
eni_dev = kmalloc(sizeof(struct eni_dev), GFP_KERNEL);
if (!eni_dev)
goto err_disable;
zero = &eni_dev->zero;
zero->addr = dma_alloc_coherent(&pci_dev->dev,
ENI_ZEROES_SIZE, &zero->dma, GFP_KERNEL);
if (!zero->addr)
goto err_kfree;
dev = atm_dev_register(DEV_LABEL, &pci_dev->dev, &ops, -1, NULL);
if (!dev)
goto err_free_consistent;
dev->dev_data = eni_dev;
pci_set_drvdata(pci_dev, dev);
eni_dev->pci_dev = pci_dev;
eni_dev->asic = ent->driver_data;
rc = eni_do_init(dev);
if (rc < 0)
goto err_unregister;
rc = eni_start(dev);
if (rc < 0)
goto err_eni_release;
eni_dev->more = eni_boards;
eni_boards = dev;
out:
return rc;
err_eni_release:
eni_do_release(dev);
err_unregister:
atm_dev_deregister(dev);
err_free_consistent:
dma_free_coherent(&pci_dev->dev, ENI_ZEROES_SIZE, zero->addr, zero->dma);
err_kfree:
kfree(eni_dev);
err_disable:
pci_disable_device(pci_dev);
goto out;
}
static const struct pci_device_id eni_pci_tbl[] = {
{ PCI_VDEVICE(EF, PCI_DEVICE_ID_EF_ATM_FPGA), 0 /* FPGA */ },
{ PCI_VDEVICE(EF, PCI_DEVICE_ID_EF_ATM_ASIC), 1 /* ASIC */ },
{ 0, }
};
MODULE_DEVICE_TABLE(pci,eni_pci_tbl);
static void eni_remove_one(struct pci_dev *pdev)
{
struct atm_dev *dev = pci_get_drvdata(pdev);
struct eni_dev *ed = ENI_DEV(dev);
struct eni_zero *zero = &ed->zero;
eni_do_release(dev);
atm_dev_deregister(dev);
dma_free_coherent(&pdev->dev, ENI_ZEROES_SIZE, zero->addr, zero->dma);
kfree(ed);
pci_disable_device(pdev);
}
static struct pci_driver eni_driver = {
.name = DEV_LABEL,
.id_table = eni_pci_tbl,
.probe = eni_init_one,
.remove = eni_remove_one,
};
static int __init eni_init(void)
{
struct sk_buff *skb; /* dummy for sizeof */
BUILD_BUG_ON(sizeof(skb->cb) < sizeof(struct eni_skb_prv));
return pci_register_driver(&eni_driver);
}
module_init(eni_init);
/* @@@ since exit routine not defined, this module can not be unloaded */
MODULE_LICENSE("GPL");
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