ia64/linux-2.6.18-xen.hg

view drivers/net/sun3lance.c @ 897:329ea0ccb344

balloon: try harder to balloon up under memory pressure.

Currently if the balloon driver is unable to increase the guest's
reservation it assumes the failure was due to reaching its full
allocation, gives up on the ballooning operation and records the limit
it reached as the "hard limit". The driver will not try again until
the target is set again (even to the same value).

However it is possible that ballooning has in fact failed due to
memory pressure in the host and therefore it is desirable to keep
attempting to reach the target in case memory becomes available. The
most likely scenario is that some guests are ballooning down while
others are ballooning up and therefore there is temporary memory
pressure while things stabilise. You would not expect a well behaved
toolstack to ask a domain to balloon to more than its allocation nor
would you expect it to deliberately over-commit memory by setting
balloon targets which exceed the total host memory.

This patch drops the concept of a hard limit and causes the balloon
driver to retry increasing the reservation on a timer in the same
manner as when decreasing the reservation.

Also if we partially succeed in increasing the reservation
(i.e. receive less pages than we asked for) then we may as well keep
those pages rather than returning them to Xen.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
author Keir Fraser <keir.fraser@citrix.com>
date Fri Jun 05 14:01:20 2009 +0100 (2009-06-05)
parents 831230e53067
children
line source
1 /* sun3lance.c: Ethernet driver for SUN3 Lance chip */
2 /*
4 Sun3 Lance ethernet driver, by Sam Creasey (sammy@users.qual.net).
5 This driver is a part of the linux kernel, and is thus distributed
6 under the GNU General Public License.
8 The values used in LANCE_OBIO and LANCE_IRQ seem to be empirically
9 true for the correct IRQ and address of the lance registers. They
10 have not been widely tested, however. What we probably need is a
11 "proper" way to search for a device in the sun3's prom, but, alas,
12 linux has no such thing.
14 This driver is largely based on atarilance.c, by Roman Hodek. Other
15 sources of inspiration were the NetBSD sun3 am7990 driver, and the
16 linux sparc lance driver (sunlance.c).
18 There are more assumptions made throughout this driver, it almost
19 certainly still needs work, but it does work at least for RARP/BOOTP and
20 mounting the root NFS filesystem.
22 */
24 static char *version = "sun3lance.c: v1.2 1/12/2001 Sam Creasey (sammy@sammy.net)\n";
26 #include <linux/module.h>
27 #include <linux/stddef.h>
28 #include <linux/kernel.h>
29 #include <linux/string.h>
30 #include <linux/errno.h>
31 #include <linux/slab.h>
32 #include <linux/interrupt.h>
33 #include <linux/init.h>
34 #include <linux/ioport.h>
35 #include <linux/delay.h>
36 #include <linux/netdevice.h>
37 #include <linux/etherdevice.h>
38 #include <linux/skbuff.h>
39 #include <linux/bitops.h>
41 #include <asm/setup.h>
42 #include <asm/irq.h>
43 #include <asm/io.h>
44 #include <asm/pgtable.h>
45 #include <asm/dvma.h>
46 #include <asm/idprom.h>
47 #include <asm/machines.h>
49 #ifdef CONFIG_SUN3
50 #include <asm/sun3mmu.h>
51 #else
52 #include <asm/sun3xprom.h>
53 #endif
55 /* sun3/60 addr/irq for the lance chip. If your sun is different,
56 change this. */
57 #define LANCE_OBIO 0x120000
58 #define LANCE_IRQ IRQ_AUTO_3
60 /* Debug level:
61 * 0 = silent, print only serious errors
62 * 1 = normal, print error messages
63 * 2 = debug, print debug infos
64 * 3 = debug, print even more debug infos (packet data)
65 */
67 #define LANCE_DEBUG 0
69 #ifdef LANCE_DEBUG
70 static int lance_debug = LANCE_DEBUG;
71 #else
72 static int lance_debug = 1;
73 #endif
74 module_param(lance_debug, int, 0);
75 MODULE_PARM_DESC(lance_debug, "SUN3 Lance debug level (0-3)");
76 MODULE_LICENSE("GPL");
78 #define DPRINTK(n,a) \
79 do { \
80 if (lance_debug >= n) \
81 printk a; \
82 } while( 0 )
85 /* we're only using 32k of memory, so we use 4 TX
86 buffers and 16 RX buffers. These values are expressed as log2. */
88 #define TX_LOG_RING_SIZE 3
89 #define RX_LOG_RING_SIZE 5
91 /* These are the derived values */
93 #define TX_RING_SIZE (1 << TX_LOG_RING_SIZE)
94 #define TX_RING_LEN_BITS (TX_LOG_RING_SIZE << 5)
95 #define TX_RING_MOD_MASK (TX_RING_SIZE - 1)
97 #define RX_RING_SIZE (1 << RX_LOG_RING_SIZE)
98 #define RX_RING_LEN_BITS (RX_LOG_RING_SIZE << 5)
99 #define RX_RING_MOD_MASK (RX_RING_SIZE - 1)
101 /* Definitions for packet buffer access: */
102 #define PKT_BUF_SZ 1544
104 /* Get the address of a packet buffer corresponding to a given buffer head */
105 #define PKTBUF_ADDR(head) (void *)((unsigned long)(MEM) | (head)->base)
108 /* The LANCE Rx and Tx ring descriptors. */
109 struct lance_rx_head {
110 unsigned short base; /* Low word of base addr */
111 volatile unsigned char flag;
112 unsigned char base_hi; /* High word of base addr (unused) */
113 short buf_length; /* This length is 2s complement! */
114 volatile short msg_length; /* This length is "normal". */
115 };
117 struct lance_tx_head {
118 unsigned short base; /* Low word of base addr */
119 volatile unsigned char flag;
120 unsigned char base_hi; /* High word of base addr (unused) */
121 short length; /* Length is 2s complement! */
122 volatile short misc;
123 };
125 /* The LANCE initialization block, described in databook. */
126 struct lance_init_block {
127 unsigned short mode; /* Pre-set mode */
128 unsigned char hwaddr[6]; /* Physical ethernet address */
129 unsigned int filter[2]; /* Multicast filter (unused). */
130 /* Receive and transmit ring base, along with length bits. */
131 unsigned short rdra;
132 unsigned short rlen;
133 unsigned short tdra;
134 unsigned short tlen;
135 unsigned short pad[4]; /* is thie needed? */
136 };
138 /* The whole layout of the Lance shared memory */
139 struct lance_memory {
140 struct lance_init_block init;
141 struct lance_tx_head tx_head[TX_RING_SIZE];
142 struct lance_rx_head rx_head[RX_RING_SIZE];
143 char rx_data[RX_RING_SIZE][PKT_BUF_SZ];
144 char tx_data[TX_RING_SIZE][PKT_BUF_SZ];
145 };
147 /* The driver's private device structure */
149 struct lance_private {
150 volatile unsigned short *iobase;
151 struct lance_memory *mem;
152 int new_rx, new_tx; /* The next free ring entry */
153 int old_tx, old_rx; /* ring entry to be processed */
154 struct net_device_stats stats;
155 /* These two must be longs for set_bit() */
156 long tx_full;
157 long lock;
158 };
160 /* I/O register access macros */
162 #define MEM lp->mem
163 #define DREG lp->iobase[0]
164 #define AREG lp->iobase[1]
165 #define REGA(a) (*( AREG = (a), &DREG ))
167 /* Definitions for the Lance */
169 /* tx_head flags */
170 #define TMD1_ENP 0x01 /* end of packet */
171 #define TMD1_STP 0x02 /* start of packet */
172 #define TMD1_DEF 0x04 /* deferred */
173 #define TMD1_ONE 0x08 /* one retry needed */
174 #define TMD1_MORE 0x10 /* more than one retry needed */
175 #define TMD1_ERR 0x40 /* error summary */
176 #define TMD1_OWN 0x80 /* ownership (set: chip owns) */
178 #define TMD1_OWN_CHIP TMD1_OWN
179 #define TMD1_OWN_HOST 0
181 /* tx_head misc field */
182 #define TMD3_TDR 0x03FF /* Time Domain Reflectometry counter */
183 #define TMD3_RTRY 0x0400 /* failed after 16 retries */
184 #define TMD3_LCAR 0x0800 /* carrier lost */
185 #define TMD3_LCOL 0x1000 /* late collision */
186 #define TMD3_UFLO 0x4000 /* underflow (late memory) */
187 #define TMD3_BUFF 0x8000 /* buffering error (no ENP) */
189 /* rx_head flags */
190 #define RMD1_ENP 0x01 /* end of packet */
191 #define RMD1_STP 0x02 /* start of packet */
192 #define RMD1_BUFF 0x04 /* buffer error */
193 #define RMD1_CRC 0x08 /* CRC error */
194 #define RMD1_OFLO 0x10 /* overflow */
195 #define RMD1_FRAM 0x20 /* framing error */
196 #define RMD1_ERR 0x40 /* error summary */
197 #define RMD1_OWN 0x80 /* ownership (set: ship owns) */
199 #define RMD1_OWN_CHIP RMD1_OWN
200 #define RMD1_OWN_HOST 0
202 /* register names */
203 #define CSR0 0 /* mode/status */
204 #define CSR1 1 /* init block addr (low) */
205 #define CSR2 2 /* init block addr (high) */
206 #define CSR3 3 /* misc */
207 #define CSR8 8 /* address filter */
208 #define CSR15 15 /* promiscuous mode */
210 /* CSR0 */
211 /* (R=readable, W=writeable, S=set on write, C=clear on write) */
212 #define CSR0_INIT 0x0001 /* initialize (RS) */
213 #define CSR0_STRT 0x0002 /* start (RS) */
214 #define CSR0_STOP 0x0004 /* stop (RS) */
215 #define CSR0_TDMD 0x0008 /* transmit demand (RS) */
216 #define CSR0_TXON 0x0010 /* transmitter on (R) */
217 #define CSR0_RXON 0x0020 /* receiver on (R) */
218 #define CSR0_INEA 0x0040 /* interrupt enable (RW) */
219 #define CSR0_INTR 0x0080 /* interrupt active (R) */
220 #define CSR0_IDON 0x0100 /* initialization done (RC) */
221 #define CSR0_TINT 0x0200 /* transmitter interrupt (RC) */
222 #define CSR0_RINT 0x0400 /* receiver interrupt (RC) */
223 #define CSR0_MERR 0x0800 /* memory error (RC) */
224 #define CSR0_MISS 0x1000 /* missed frame (RC) */
225 #define CSR0_CERR 0x2000 /* carrier error (no heartbeat :-) (RC) */
226 #define CSR0_BABL 0x4000 /* babble: tx-ed too many bits (RC) */
227 #define CSR0_ERR 0x8000 /* error (RC) */
229 /* CSR3 */
230 #define CSR3_BCON 0x0001 /* byte control */
231 #define CSR3_ACON 0x0002 /* ALE control */
232 #define CSR3_BSWP 0x0004 /* byte swap (1=big endian) */
234 /***************************** Prototypes *****************************/
236 static int lance_probe( struct net_device *dev);
237 static int lance_open( struct net_device *dev );
238 static void lance_init_ring( struct net_device *dev );
239 static int lance_start_xmit( struct sk_buff *skb, struct net_device *dev );
240 static irqreturn_t lance_interrupt( int irq, void *dev_id, struct pt_regs *fp );
241 static int lance_rx( struct net_device *dev );
242 static int lance_close( struct net_device *dev );
243 static struct net_device_stats *lance_get_stats( struct net_device *dev );
244 static void set_multicast_list( struct net_device *dev );
246 /************************* End of Prototypes **************************/
248 struct net_device * __init sun3lance_probe(int unit)
249 {
250 struct net_device *dev;
251 static int found;
252 int err = -ENODEV;
254 /* check that this machine has an onboard lance */
255 switch(idprom->id_machtype) {
256 case SM_SUN3|SM_3_50:
257 case SM_SUN3|SM_3_60:
258 case SM_SUN3X|SM_3_80:
259 /* these machines have lance */
260 break;
262 default:
263 return ERR_PTR(-ENODEV);
264 }
266 if (found)
267 return ERR_PTR(-ENODEV);
269 dev = alloc_etherdev(sizeof(struct lance_private));
270 if (!dev)
271 return ERR_PTR(-ENOMEM);
272 if (unit >= 0) {
273 sprintf(dev->name, "eth%d", unit);
274 netdev_boot_setup_check(dev);
275 }
276 SET_MODULE_OWNER(dev);
278 if (!lance_probe(dev))
279 goto out;
281 err = register_netdev(dev);
282 if (err)
283 goto out1;
284 found = 1;
285 return dev;
287 out1:
288 #ifdef CONFIG_SUN3
289 iounmap((void *)dev->base_addr);
290 #endif
291 out:
292 free_netdev(dev);
293 return ERR_PTR(err);
294 }
296 static int __init lance_probe( struct net_device *dev)
297 {
298 unsigned long ioaddr;
300 struct lance_private *lp;
301 int i;
302 static int did_version;
303 volatile unsigned short *ioaddr_probe;
304 unsigned short tmp1, tmp2;
306 #ifdef CONFIG_SUN3
307 ioaddr = (unsigned long)ioremap(LANCE_OBIO, PAGE_SIZE);
308 if (!ioaddr)
309 return 0;
310 #else
311 ioaddr = SUN3X_LANCE;
312 #endif
314 /* test to see if there's really a lance here */
315 /* (CSRO_INIT shouldn't be readable) */
317 ioaddr_probe = (volatile unsigned short *)ioaddr;
318 tmp1 = ioaddr_probe[0];
319 tmp2 = ioaddr_probe[1];
321 ioaddr_probe[1] = CSR0;
322 ioaddr_probe[0] = CSR0_INIT | CSR0_STOP;
324 if(ioaddr_probe[0] != CSR0_STOP) {
325 ioaddr_probe[0] = tmp1;
326 ioaddr_probe[1] = tmp2;
328 #ifdef CONFIG_SUN3
329 iounmap((void *)ioaddr);
330 #endif
331 return 0;
332 }
334 lp = netdev_priv(dev);
336 /* XXX - leak? */
337 MEM = dvma_malloc_align(sizeof(struct lance_memory), 0x10000);
339 lp->iobase = (volatile unsigned short *)ioaddr;
340 dev->base_addr = (unsigned long)ioaddr; /* informational only */
342 REGA(CSR0) = CSR0_STOP;
344 request_irq(LANCE_IRQ, lance_interrupt, IRQF_DISABLED, "SUN3 Lance", dev);
345 dev->irq = (unsigned short)LANCE_IRQ;
348 printk("%s: SUN3 Lance at io %#lx, mem %#lx, irq %d, hwaddr ",
349 dev->name,
350 (unsigned long)ioaddr,
351 (unsigned long)MEM,
352 dev->irq);
354 /* copy in the ethernet address from the prom */
355 for(i = 0; i < 6 ; i++)
356 dev->dev_addr[i] = idprom->id_ethaddr[i];
358 /* tell the card it's ether address, bytes swapped */
359 MEM->init.hwaddr[0] = dev->dev_addr[1];
360 MEM->init.hwaddr[1] = dev->dev_addr[0];
361 MEM->init.hwaddr[2] = dev->dev_addr[3];
362 MEM->init.hwaddr[3] = dev->dev_addr[2];
363 MEM->init.hwaddr[4] = dev->dev_addr[5];
364 MEM->init.hwaddr[5] = dev->dev_addr[4];
366 for( i = 0; i < 6; ++i )
367 printk( "%02x%s", dev->dev_addr[i], (i < 5) ? ":" : "\n" );
369 MEM->init.mode = 0x0000;
370 MEM->init.filter[0] = 0x00000000;
371 MEM->init.filter[1] = 0x00000000;
372 MEM->init.rdra = dvma_vtob(MEM->rx_head);
373 MEM->init.rlen = (RX_LOG_RING_SIZE << 13) |
374 (dvma_vtob(MEM->rx_head) >> 16);
375 MEM->init.tdra = dvma_vtob(MEM->tx_head);
376 MEM->init.tlen = (TX_LOG_RING_SIZE << 13) |
377 (dvma_vtob(MEM->tx_head) >> 16);
379 DPRINTK(2, ("initaddr: %08lx rx_ring: %08lx tx_ring: %08lx\n",
380 dvma_vtob(&(MEM->init)), dvma_vtob(MEM->rx_head),
381 (dvma_vtob(MEM->tx_head))));
383 if (did_version++ == 0)
384 printk( version );
386 /* The LANCE-specific entries in the device structure. */
387 dev->open = &lance_open;
388 dev->hard_start_xmit = &lance_start_xmit;
389 dev->stop = &lance_close;
390 dev->get_stats = &lance_get_stats;
391 dev->set_multicast_list = &set_multicast_list;
392 dev->set_mac_address = NULL;
393 // KLUDGE -- REMOVE ME
394 set_bit(__LINK_STATE_PRESENT, &dev->state);
397 memset( &lp->stats, 0, sizeof(lp->stats) );
399 return 1;
400 }
402 static int lance_open( struct net_device *dev )
403 {
404 struct lance_private *lp = netdev_priv(dev);
405 int i;
407 DPRINTK( 2, ( "%s: lance_open()\n", dev->name ));
409 REGA(CSR0) = CSR0_STOP;
411 lance_init_ring(dev);
413 /* From now on, AREG is kept to point to CSR0 */
414 REGA(CSR0) = CSR0_INIT;
416 i = 1000000;
417 while (--i > 0)
418 if (DREG & CSR0_IDON)
419 break;
420 if (i < 0 || (DREG & CSR0_ERR)) {
421 DPRINTK( 2, ( "lance_open(): opening %s failed, i=%d, csr0=%04x\n",
422 dev->name, i, DREG ));
423 DREG = CSR0_STOP;
424 return( -EIO );
425 }
427 DREG = CSR0_IDON | CSR0_STRT | CSR0_INEA;
429 netif_start_queue(dev);
431 DPRINTK( 2, ( "%s: LANCE is open, csr0 %04x\n", dev->name, DREG ));
433 return( 0 );
434 }
437 /* Initialize the LANCE Rx and Tx rings. */
439 static void lance_init_ring( struct net_device *dev )
440 {
441 struct lance_private *lp = netdev_priv(dev);
442 int i;
444 lp->lock = 0;
445 lp->tx_full = 0;
446 lp->new_rx = lp->new_tx = 0;
447 lp->old_rx = lp->old_tx = 0;
449 for( i = 0; i < TX_RING_SIZE; i++ ) {
450 MEM->tx_head[i].base = dvma_vtob(MEM->tx_data[i]);
451 MEM->tx_head[i].flag = 0;
452 MEM->tx_head[i].base_hi =
453 (dvma_vtob(MEM->tx_data[i])) >>16;
454 MEM->tx_head[i].length = 0;
455 MEM->tx_head[i].misc = 0;
456 }
458 for( i = 0; i < RX_RING_SIZE; i++ ) {
459 MEM->rx_head[i].base = dvma_vtob(MEM->rx_data[i]);
460 MEM->rx_head[i].flag = RMD1_OWN_CHIP;
461 MEM->rx_head[i].base_hi =
462 (dvma_vtob(MEM->rx_data[i])) >> 16;
463 MEM->rx_head[i].buf_length = -PKT_BUF_SZ | 0xf000;
464 MEM->rx_head[i].msg_length = 0;
465 }
467 /* tell the card it's ether address, bytes swapped */
468 MEM->init.hwaddr[0] = dev->dev_addr[1];
469 MEM->init.hwaddr[1] = dev->dev_addr[0];
470 MEM->init.hwaddr[2] = dev->dev_addr[3];
471 MEM->init.hwaddr[3] = dev->dev_addr[2];
472 MEM->init.hwaddr[4] = dev->dev_addr[5];
473 MEM->init.hwaddr[5] = dev->dev_addr[4];
475 MEM->init.mode = 0x0000;
476 MEM->init.filter[0] = 0x00000000;
477 MEM->init.filter[1] = 0x00000000;
478 MEM->init.rdra = dvma_vtob(MEM->rx_head);
479 MEM->init.rlen = (RX_LOG_RING_SIZE << 13) |
480 (dvma_vtob(MEM->rx_head) >> 16);
481 MEM->init.tdra = dvma_vtob(MEM->tx_head);
482 MEM->init.tlen = (TX_LOG_RING_SIZE << 13) |
483 (dvma_vtob(MEM->tx_head) >> 16);
486 /* tell the lance the address of its init block */
487 REGA(CSR1) = dvma_vtob(&(MEM->init));
488 REGA(CSR2) = dvma_vtob(&(MEM->init)) >> 16;
490 #ifdef CONFIG_SUN3X
491 REGA(CSR3) = CSR3_BSWP | CSR3_ACON | CSR3_BCON;
492 #else
493 REGA(CSR3) = CSR3_BSWP;
494 #endif
496 }
499 static int lance_start_xmit( struct sk_buff *skb, struct net_device *dev )
500 {
501 struct lance_private *lp = netdev_priv(dev);
502 int entry, len;
503 struct lance_tx_head *head;
504 unsigned long flags;
506 DPRINTK( 1, ( "%s: transmit start.\n",
507 dev->name));
509 /* Transmitter timeout, serious problems. */
510 if (netif_queue_stopped(dev)) {
511 int tickssofar = jiffies - dev->trans_start;
512 if (tickssofar < 20)
513 return( 1 );
515 DPRINTK( 1, ( "%s: transmit timed out, status %04x, resetting.\n",
516 dev->name, DREG ));
517 DREG = CSR0_STOP;
518 /*
519 * Always set BSWP after a STOP as STOP puts it back into
520 * little endian mode.
521 */
522 REGA(CSR3) = CSR3_BSWP;
523 lp->stats.tx_errors++;
525 if(lance_debug >= 2) {
526 int i;
527 printk("Ring data: old_tx %d new_tx %d%s new_rx %d\n",
528 lp->old_tx, lp->new_tx,
529 lp->tx_full ? " (full)" : "",
530 lp->new_rx );
531 for( i = 0 ; i < RX_RING_SIZE; i++ )
532 printk( "rx #%d: base=%04x blen=%04x mlen=%04x\n",
533 i, MEM->rx_head[i].base,
534 -MEM->rx_head[i].buf_length,
535 MEM->rx_head[i].msg_length);
536 for( i = 0 ; i < TX_RING_SIZE; i++ )
537 printk("tx #%d: base=%04x len=%04x misc=%04x\n",
538 i, MEM->tx_head[i].base,
539 -MEM->tx_head[i].length,
540 MEM->tx_head[i].misc );
541 }
543 lance_init_ring(dev);
544 REGA( CSR0 ) = CSR0_INEA | CSR0_INIT | CSR0_STRT;
546 netif_start_queue(dev);
547 dev->trans_start = jiffies;
549 return 0;
550 }
553 /* Block a timer-based transmit from overlapping. This could better be
554 done with atomic_swap(1, dev->tbusy), but set_bit() works as well. */
556 /* Block a timer-based transmit from overlapping with us by
557 stopping the queue for a bit... */
559 netif_stop_queue(dev);
561 if (test_and_set_bit( 0, (void*)&lp->lock ) != 0) {
562 printk( "%s: tx queue lock!.\n", dev->name);
563 /* don't clear dev->tbusy flag. */
564 return 1;
565 }
567 AREG = CSR0;
568 DPRINTK( 2, ( "%s: lance_start_xmit() called, csr0 %4.4x.\n",
569 dev->name, DREG ));
571 #ifdef CONFIG_SUN3X
572 /* this weirdness doesn't appear on sun3... */
573 if(!(DREG & CSR0_INIT)) {
574 DPRINTK( 1, ("INIT not set, reinitializing...\n"));
575 REGA( CSR0 ) = CSR0_STOP;
576 lance_init_ring(dev);
577 REGA( CSR0 ) = CSR0_INIT | CSR0_STRT;
578 }
579 #endif
581 /* Fill in a Tx ring entry */
582 #if 0
583 if (lance_debug >= 2) {
584 u_char *p;
585 int i;
586 printk( "%s: TX pkt %d type 0x%04x from ", dev->name,
587 lp->new_tx, ((u_short *)skb->data)[6]);
588 for( p = &((u_char *)skb->data)[6], i = 0; i < 6; i++ )
589 printk("%02x%s", *p++, i != 5 ? ":" : "" );
590 printk(" to ");
591 for( p = (u_char *)skb->data, i = 0; i < 6; i++ )
592 printk("%02x%s", *p++, i != 5 ? ":" : "" );
593 printk(" data at 0x%08x len %d\n", (int)skb->data,
594 (int)skb->len );
595 }
596 #endif
597 /* We're not prepared for the int until the last flags are set/reset.
598 * And the int may happen already after setting the OWN_CHIP... */
599 local_irq_save(flags);
601 /* Mask to ring buffer boundary. */
602 entry = lp->new_tx;
603 head = &(MEM->tx_head[entry]);
605 /* Caution: the write order is important here, set the "ownership" bits
606 * last.
607 */
609 /* the sun3's lance needs it's buffer padded to the minimum
610 size */
611 len = (ETH_ZLEN < skb->len) ? skb->len : ETH_ZLEN;
613 // head->length = -len;
614 head->length = (-len) | 0xf000;
615 head->misc = 0;
617 memcpy( PKTBUF_ADDR(head), (void *)skb->data, skb->len );
618 if (len != skb->len)
619 memset(PKTBUF_ADDR(head) + skb->len, 0, len-skb->len);
621 head->flag = TMD1_OWN_CHIP | TMD1_ENP | TMD1_STP;
622 lp->new_tx = (lp->new_tx + 1) & TX_RING_MOD_MASK;
623 lp->stats.tx_bytes += skb->len;
625 /* Trigger an immediate send poll. */
626 REGA(CSR0) = CSR0_INEA | CSR0_TDMD | CSR0_STRT;
627 AREG = CSR0;
628 DPRINTK( 2, ( "%s: lance_start_xmit() exiting, csr0 %4.4x.\n",
629 dev->name, DREG ));
630 dev->trans_start = jiffies;
631 dev_kfree_skb( skb );
633 lp->lock = 0;
634 if ((MEM->tx_head[(entry+1) & TX_RING_MOD_MASK].flag & TMD1_OWN) ==
635 TMD1_OWN_HOST)
636 netif_start_queue(dev);
638 local_irq_restore(flags);
640 return 0;
641 }
643 /* The LANCE interrupt handler. */
645 static irqreturn_t lance_interrupt( int irq, void *dev_id, struct pt_regs *fp)
646 {
647 struct net_device *dev = dev_id;
648 struct lance_private *lp = netdev_priv(dev);
649 int csr0;
650 static int in_interrupt;
652 if (dev == NULL) {
653 DPRINTK( 1, ( "lance_interrupt(): invalid dev_id\n" ));
654 return IRQ_NONE;
655 }
657 if (in_interrupt)
658 DPRINTK( 2, ( "%s: Re-entering the interrupt handler.\n", dev->name ));
659 in_interrupt = 1;
661 still_more:
662 flush_cache_all();
664 AREG = CSR0;
665 csr0 = DREG;
667 /* ack interrupts */
668 DREG = csr0 & (CSR0_TINT | CSR0_RINT | CSR0_IDON);
670 /* clear errors */
671 if(csr0 & CSR0_ERR)
672 DREG = CSR0_BABL | CSR0_MERR | CSR0_CERR | CSR0_MISS;
675 DPRINTK( 2, ( "%s: interrupt csr0=%04x new csr=%04x.\n",
676 dev->name, csr0, DREG ));
678 if (csr0 & CSR0_TINT) { /* Tx-done interrupt */
679 int old_tx = lp->old_tx;
681 // if(lance_debug >= 3) {
682 // int i;
683 //
684 // printk("%s: tx int\n", dev->name);
685 //
686 // for(i = 0; i < TX_RING_SIZE; i++)
687 // printk("ring %d flag=%04x\n", i,
688 // MEM->tx_head[i].flag);
689 // }
691 while( old_tx != lp->new_tx) {
692 struct lance_tx_head *head = &(MEM->tx_head[old_tx]);
694 DPRINTK(3, ("on tx_ring %d\n", old_tx));
696 if (head->flag & TMD1_OWN_CHIP)
697 break; /* It still hasn't been Txed */
699 if (head->flag & TMD1_ERR) {
700 int status = head->misc;
701 lp->stats.tx_errors++;
702 if (status & TMD3_RTRY) lp->stats.tx_aborted_errors++;
703 if (status & TMD3_LCAR) lp->stats.tx_carrier_errors++;
704 if (status & TMD3_LCOL) lp->stats.tx_window_errors++;
705 if (status & (TMD3_UFLO | TMD3_BUFF)) {
706 lp->stats.tx_fifo_errors++;
707 printk("%s: Tx FIFO error\n",
708 dev->name);
709 REGA(CSR0) = CSR0_STOP;
710 REGA(CSR3) = CSR3_BSWP;
711 lance_init_ring(dev);
712 REGA(CSR0) = CSR0_STRT | CSR0_INEA;
713 return IRQ_HANDLED;
714 }
715 } else if(head->flag & (TMD1_ENP | TMD1_STP)) {
717 head->flag &= ~(TMD1_ENP | TMD1_STP);
718 if(head->flag & (TMD1_ONE | TMD1_MORE))
719 lp->stats.collisions++;
721 lp->stats.tx_packets++;
722 DPRINTK(3, ("cleared tx ring %d\n", old_tx));
723 }
724 old_tx = (old_tx +1) & TX_RING_MOD_MASK;
725 }
727 lp->old_tx = old_tx;
728 }
731 if (netif_queue_stopped(dev)) {
732 /* The ring is no longer full, clear tbusy. */
733 netif_start_queue(dev);
734 netif_wake_queue(dev);
735 }
737 if (csr0 & CSR0_RINT) /* Rx interrupt */
738 lance_rx( dev );
740 /* Log misc errors. */
741 if (csr0 & CSR0_BABL) lp->stats.tx_errors++; /* Tx babble. */
742 if (csr0 & CSR0_MISS) lp->stats.rx_errors++; /* Missed a Rx frame. */
743 if (csr0 & CSR0_MERR) {
744 DPRINTK( 1, ( "%s: Bus master arbitration failure (?!?), "
745 "status %04x.\n", dev->name, csr0 ));
746 /* Restart the chip. */
747 REGA(CSR0) = CSR0_STOP;
748 REGA(CSR3) = CSR3_BSWP;
749 lance_init_ring(dev);
750 REGA(CSR0) = CSR0_STRT | CSR0_INEA;
751 }
754 /* Clear any other interrupt, and set interrupt enable. */
755 // DREG = CSR0_BABL | CSR0_CERR | CSR0_MISS | CSR0_MERR |
756 // CSR0_IDON | CSR0_INEA;
758 REGA(CSR0) = CSR0_INEA;
760 if(DREG & (CSR0_RINT | CSR0_TINT)) {
761 DPRINTK(2, ("restarting interrupt, csr0=%#04x\n", DREG));
762 goto still_more;
763 }
765 DPRINTK( 2, ( "%s: exiting interrupt, csr0=%#04x.\n",
766 dev->name, DREG ));
767 in_interrupt = 0;
768 return IRQ_HANDLED;
769 }
771 /* get packet, toss into skbuff */
772 static int lance_rx( struct net_device *dev )
773 {
774 struct lance_private *lp = netdev_priv(dev);
775 int entry = lp->new_rx;
777 /* If we own the next entry, it's a new packet. Send it up. */
778 while( (MEM->rx_head[entry].flag & RMD1_OWN) == RMD1_OWN_HOST ) {
779 struct lance_rx_head *head = &(MEM->rx_head[entry]);
780 int status = head->flag;
782 if (status != (RMD1_ENP|RMD1_STP)) { /* There was an error. */
783 /* There is a tricky error noted by John Murphy,
784 <murf@perftech.com> to Russ Nelson: Even with
785 full-sized buffers it's possible for a jabber packet to use two
786 buffers, with only the last correctly noting the error. */
787 if (status & RMD1_ENP) /* Only count a general error at the */
788 lp->stats.rx_errors++; /* end of a packet.*/
789 if (status & RMD1_FRAM) lp->stats.rx_frame_errors++;
790 if (status & RMD1_OFLO) lp->stats.rx_over_errors++;
791 if (status & RMD1_CRC) lp->stats.rx_crc_errors++;
792 if (status & RMD1_BUFF) lp->stats.rx_fifo_errors++;
793 head->flag &= (RMD1_ENP|RMD1_STP);
794 } else {
795 /* Malloc up new buffer, compatible with net-3. */
796 // short pkt_len = head->msg_length;// & 0xfff;
797 short pkt_len = (head->msg_length & 0xfff) - 4;
798 struct sk_buff *skb;
800 if (pkt_len < 60) {
801 printk( "%s: Runt packet!\n", dev->name );
802 lp->stats.rx_errors++;
803 }
804 else {
805 skb = dev_alloc_skb( pkt_len+2 );
806 if (skb == NULL) {
807 DPRINTK( 1, ( "%s: Memory squeeze, deferring packet.\n",
808 dev->name ));
810 lp->stats.rx_dropped++;
811 head->msg_length = 0;
812 head->flag |= RMD1_OWN_CHIP;
813 lp->new_rx = (lp->new_rx+1) &
814 RX_RING_MOD_MASK;
815 }
817 #if 0
818 if (lance_debug >= 3) {
819 u_char *data = PKTBUF_ADDR(head), *p;
820 printk( "%s: RX pkt %d type 0x%04x from ", dev->name, entry, ((u_short *)data)[6]);
821 for( p = &data[6], i = 0; i < 6; i++ )
822 printk("%02x%s", *p++, i != 5 ? ":" : "" );
823 printk(" to ");
824 for( p = data, i = 0; i < 6; i++ )
825 printk("%02x%s", *p++, i != 5 ? ":" : "" );
826 printk(" data %02x %02x %02x %02x %02x %02x %02x %02x "
827 "len %d at %08x\n",
828 data[15], data[16], data[17], data[18],
829 data[19], data[20], data[21], data[22],
830 pkt_len, data);
831 }
832 #endif
833 if (lance_debug >= 3) {
834 u_char *data = PKTBUF_ADDR(head);
835 printk( "%s: RX pkt %d type 0x%04x len %d\n ", dev->name, entry, ((u_short *)data)[6], pkt_len);
836 }
839 skb->dev = dev;
840 skb_reserve( skb, 2 ); /* 16 byte align */
841 skb_put( skb, pkt_len ); /* Make room */
842 // memcpy( skb->data, PKTBUF_ADDR(head), pkt_len );
843 eth_copy_and_sum(skb,
844 PKTBUF_ADDR(head),
845 pkt_len, 0);
847 skb->protocol = eth_type_trans( skb, dev );
848 netif_rx( skb );
849 dev->last_rx = jiffies;
850 lp->stats.rx_packets++;
851 lp->stats.rx_bytes += pkt_len;
852 }
853 }
855 // head->buf_length = -PKT_BUF_SZ | 0xf000;
856 head->msg_length = 0;
857 head->flag = RMD1_OWN_CHIP;
859 entry = lp->new_rx = (lp->new_rx +1) & RX_RING_MOD_MASK;
860 }
862 /* From lance.c (Donald Becker): */
863 /* We should check that at least two ring entries are free.
864 If not, we should free one and mark stats->rx_dropped++. */
866 return 0;
867 }
870 static int lance_close( struct net_device *dev )
871 {
872 struct lance_private *lp = netdev_priv(dev);
874 netif_stop_queue(dev);
876 AREG = CSR0;
878 DPRINTK( 2, ( "%s: Shutting down ethercard, status was %2.2x.\n",
879 dev->name, DREG ));
881 /* We stop the LANCE here -- it occasionally polls
882 memory if we don't. */
883 DREG = CSR0_STOP;
884 return 0;
885 }
888 static struct net_device_stats *lance_get_stats( struct net_device *dev )
889 {
890 struct lance_private *lp = netdev_priv(dev);
892 return &lp->stats;
893 }
896 /* Set or clear the multicast filter for this adaptor.
897 num_addrs == -1 Promiscuous mode, receive all packets
898 num_addrs == 0 Normal mode, clear multicast list
899 num_addrs > 0 Multicast mode, receive normal and MC packets, and do
900 best-effort filtering.
901 */
903 /* completely untested on a sun3 */
904 static void set_multicast_list( struct net_device *dev )
905 {
906 struct lance_private *lp = netdev_priv(dev);
908 if(netif_queue_stopped(dev))
909 /* Only possible if board is already started */
910 return;
912 /* We take the simple way out and always enable promiscuous mode. */
913 DREG = CSR0_STOP; /* Temporarily stop the lance. */
915 if (dev->flags & IFF_PROMISC) {
916 /* Log any net taps. */
917 DPRINTK( 1, ( "%s: Promiscuous mode enabled.\n", dev->name ));
918 REGA( CSR15 ) = 0x8000; /* Set promiscuous mode */
919 } else {
920 short multicast_table[4];
921 int num_addrs = dev->mc_count;
922 int i;
923 /* We don't use the multicast table, but rely on upper-layer
924 * filtering. */
925 memset( multicast_table, (num_addrs == 0) ? 0 : -1,
926 sizeof(multicast_table) );
927 for( i = 0; i < 4; i++ )
928 REGA( CSR8+i ) = multicast_table[i];
929 REGA( CSR15 ) = 0; /* Unset promiscuous mode */
930 }
932 /*
933 * Always set BSWP after a STOP as STOP puts it back into
934 * little endian mode.
935 */
936 REGA( CSR3 ) = CSR3_BSWP;
938 /* Resume normal operation and reset AREG to CSR0 */
939 REGA( CSR0 ) = CSR0_IDON | CSR0_INEA | CSR0_STRT;
940 }
943 #ifdef MODULE
945 static struct net_device *sun3lance_dev;
947 int init_module(void)
948 {
949 sun3lance_dev = sun3lance_probe(-1);
950 if (IS_ERR(sun3lance_dev))
951 return PTR_ERR(sun3lance_dev);
952 return 0;
953 }
955 void cleanup_module(void)
956 {
957 unregister_netdev(sun3lance_dev);
958 #ifdef CONFIG_SUN3
959 iounmap((void *)sun3lance_dev->base_addr);
960 #endif
961 free_netdev(sun3lance_dev);
962 }
964 #endif /* MODULE */