ia64/linux-2.6.18-xen.hg

view drivers/net/8390.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 /* 8390.c: A general NS8390 ethernet driver core for linux. */
2 /*
3 Written 1992-94 by Donald Becker.
5 Copyright 1993 United States Government as represented by the
6 Director, National Security Agency.
8 This software may be used and distributed according to the terms
9 of the GNU General Public License, incorporated herein by reference.
11 The author may be reached as becker@scyld.com, or C/O
12 Scyld Computing Corporation
13 410 Severn Ave., Suite 210
14 Annapolis MD 21403
17 This is the chip-specific code for many 8390-based ethernet adaptors.
18 This is not a complete driver, it must be combined with board-specific
19 code such as ne.c, wd.c, 3c503.c, etc.
21 Seeing how at least eight drivers use this code, (not counting the
22 PCMCIA ones either) it is easy to break some card by what seems like
23 a simple innocent change. Please contact me or Donald if you think
24 you have found something that needs changing. -- PG
27 Changelog:
29 Paul Gortmaker : remove set_bit lock, other cleanups.
30 Paul Gortmaker : add ei_get_8390_hdr() so we can pass skb's to
31 ei_block_input() for eth_io_copy_and_sum().
32 Paul Gortmaker : exchange static int ei_pingpong for a #define,
33 also add better Tx error handling.
34 Paul Gortmaker : rewrite Rx overrun handling as per NS specs.
35 Alexey Kuznetsov : use the 8390's six bit hash multicast filter.
36 Paul Gortmaker : tweak ANK's above multicast changes a bit.
37 Paul Gortmaker : update packet statistics for v2.1.x
38 Alan Cox : support arbitary stupid port mappings on the
39 68K Macintosh. Support >16bit I/O spaces
40 Paul Gortmaker : add kmod support for auto-loading of the 8390
41 module by all drivers that require it.
42 Alan Cox : Spinlocking work, added 'BUG_83C690'
43 Paul Gortmaker : Separate out Tx timeout code from Tx path.
44 Paul Gortmaker : Remove old unused single Tx buffer code.
45 Hayato Fujiwara : Add m32r support.
46 Paul Gortmaker : use skb_padto() instead of stack scratch area
48 Sources:
49 The National Semiconductor LAN Databook, and the 3Com 3c503 databook.
51 */
53 static const char version[] =
54 "8390.c:v1.10cvs 9/23/94 Donald Becker (becker@cesdis.gsfc.nasa.gov)\n";
56 #include <linux/module.h>
57 #include <linux/kernel.h>
58 #include <linux/jiffies.h>
59 #include <linux/fs.h>
60 #include <linux/types.h>
61 #include <linux/string.h>
62 #include <linux/bitops.h>
63 #include <asm/system.h>
64 #include <asm/uaccess.h>
65 #include <asm/io.h>
66 #include <asm/irq.h>
67 #include <linux/delay.h>
68 #include <linux/errno.h>
69 #include <linux/fcntl.h>
70 #include <linux/in.h>
71 #include <linux/interrupt.h>
72 #include <linux/init.h>
73 #include <linux/crc32.h>
75 #include <linux/netdevice.h>
76 #include <linux/etherdevice.h>
78 #define NS8390_CORE
79 #include "8390.h"
81 #define BUG_83C690
83 /* These are the operational function interfaces to board-specific
84 routines.
85 void reset_8390(struct net_device *dev)
86 Resets the board associated with DEV, including a hardware reset of
87 the 8390. This is only called when there is a transmit timeout, and
88 it is always followed by 8390_init().
89 void block_output(struct net_device *dev, int count, const unsigned char *buf,
90 int start_page)
91 Write the COUNT bytes of BUF to the packet buffer at START_PAGE. The
92 "page" value uses the 8390's 256-byte pages.
93 void get_8390_hdr(struct net_device *dev, struct e8390_hdr *hdr, int ring_page)
94 Read the 4 byte, page aligned 8390 header. *If* there is a
95 subsequent read, it will be of the rest of the packet.
96 void block_input(struct net_device *dev, int count, struct sk_buff *skb, int ring_offset)
97 Read COUNT bytes from the packet buffer into the skb data area. Start
98 reading from RING_OFFSET, the address as the 8390 sees it. This will always
99 follow the read of the 8390 header.
100 */
101 #define ei_reset_8390 (ei_local->reset_8390)
102 #define ei_block_output (ei_local->block_output)
103 #define ei_block_input (ei_local->block_input)
104 #define ei_get_8390_hdr (ei_local->get_8390_hdr)
106 /* use 0 for production, 1 for verification, >2 for debug */
107 #ifndef ei_debug
108 int ei_debug = 1;
109 #endif
111 /* Index to functions. */
112 static void ei_tx_intr(struct net_device *dev);
113 static void ei_tx_err(struct net_device *dev);
114 static void ei_tx_timeout(struct net_device *dev);
115 static void ei_receive(struct net_device *dev);
116 static void ei_rx_overrun(struct net_device *dev);
118 /* Routines generic to NS8390-based boards. */
119 static void NS8390_trigger_send(struct net_device *dev, unsigned int length,
120 int start_page);
121 static void set_multicast_list(struct net_device *dev);
122 static void do_set_multicast_list(struct net_device *dev);
124 /*
125 * SMP and the 8390 setup.
126 *
127 * The 8390 isnt exactly designed to be multithreaded on RX/TX. There is
128 * a page register that controls bank and packet buffer access. We guard
129 * this with ei_local->page_lock. Nobody should assume or set the page other
130 * than zero when the lock is not held. Lock holders must restore page 0
131 * before unlocking. Even pure readers must take the lock to protect in
132 * page 0.
133 *
134 * To make life difficult the chip can also be very slow. We therefore can't
135 * just use spinlocks. For the longer lockups we disable the irq the device
136 * sits on and hold the lock. We must hold the lock because there is a dual
137 * processor case other than interrupts (get stats/set multicast list in
138 * parallel with each other and transmit).
139 *
140 * Note: in theory we can just disable the irq on the card _but_ there is
141 * a latency on SMP irq delivery. So we can easily go "disable irq" "sync irqs"
142 * enter lock, take the queued irq. So we waddle instead of flying.
143 *
144 * Finally by special arrangement for the purpose of being generally
145 * annoying the transmit function is called bh atomic. That places
146 * restrictions on the user context callers as disable_irq won't save
147 * them.
148 */
152 /**
153 * ei_open - Open/initialize the board.
154 * @dev: network device to initialize
155 *
156 * This routine goes all-out, setting everything
157 * up anew at each open, even though many of these registers should only
158 * need to be set once at boot.
159 */
160 int ei_open(struct net_device *dev)
161 {
162 unsigned long flags;
163 struct ei_device *ei_local = (struct ei_device *) netdev_priv(dev);
165 /* The card I/O part of the driver (e.g. 3c503) can hook a Tx timeout
166 wrapper that does e.g. media check & then calls ei_tx_timeout. */
167 if (dev->tx_timeout == NULL)
168 dev->tx_timeout = ei_tx_timeout;
169 if (dev->watchdog_timeo <= 0)
170 dev->watchdog_timeo = TX_TIMEOUT;
172 /*
173 * Grab the page lock so we own the register set, then call
174 * the init function.
175 */
177 spin_lock_irqsave(&ei_local->page_lock, flags);
178 NS8390_init(dev, 1);
179 /* Set the flag before we drop the lock, That way the IRQ arrives
180 after its set and we get no silly warnings */
181 netif_start_queue(dev);
182 spin_unlock_irqrestore(&ei_local->page_lock, flags);
183 ei_local->irqlock = 0;
184 return 0;
185 }
187 /**
188 * ei_close - shut down network device
189 * @dev: network device to close
190 *
191 * Opposite of ei_open(). Only used when "ifconfig <devname> down" is done.
192 */
193 int ei_close(struct net_device *dev)
194 {
195 struct ei_device *ei_local = (struct ei_device *) netdev_priv(dev);
196 unsigned long flags;
198 /*
199 * Hold the page lock during close
200 */
202 spin_lock_irqsave(&ei_local->page_lock, flags);
203 NS8390_init(dev, 0);
204 spin_unlock_irqrestore(&ei_local->page_lock, flags);
205 netif_stop_queue(dev);
206 return 0;
207 }
209 /**
210 * ei_tx_timeout - handle transmit time out condition
211 * @dev: network device which has apparently fallen asleep
212 *
213 * Called by kernel when device never acknowledges a transmit has
214 * completed (or failed) - i.e. never posted a Tx related interrupt.
215 */
217 void ei_tx_timeout(struct net_device *dev)
218 {
219 long e8390_base = dev->base_addr;
220 struct ei_device *ei_local = (struct ei_device *) netdev_priv(dev);
221 int txsr, isr, tickssofar = jiffies - dev->trans_start;
222 unsigned long flags;
224 #if defined(CONFIG_M32R) && defined(CONFIG_SMP)
225 unsigned long icucr;
227 local_irq_save(flags);
228 icucr = inl(M32R_ICU_CR1_PORTL);
229 icucr |= M32R_ICUCR_ISMOD11;
230 outl(icucr, M32R_ICU_CR1_PORTL);
231 local_irq_restore(flags);
232 #endif
233 ei_local->stat.tx_errors++;
235 spin_lock_irqsave(&ei_local->page_lock, flags);
236 txsr = inb(e8390_base+EN0_TSR);
237 isr = inb(e8390_base+EN0_ISR);
238 spin_unlock_irqrestore(&ei_local->page_lock, flags);
240 printk(KERN_DEBUG "%s: Tx timed out, %s TSR=%#2x, ISR=%#2x, t=%d.\n",
241 dev->name, (txsr & ENTSR_ABT) ? "excess collisions." :
242 (isr) ? "lost interrupt?" : "cable problem?", txsr, isr, tickssofar);
244 if (!isr && !ei_local->stat.tx_packets)
245 {
246 /* The 8390 probably hasn't gotten on the cable yet. */
247 ei_local->interface_num ^= 1; /* Try a different xcvr. */
248 }
250 /* Ugly but a reset can be slow, yet must be protected */
252 disable_irq_nosync_lockdep(dev->irq);
253 spin_lock(&ei_local->page_lock);
255 /* Try to restart the card. Perhaps the user has fixed something. */
256 ei_reset_8390(dev);
257 NS8390_init(dev, 1);
259 spin_unlock(&ei_local->page_lock);
260 enable_irq_lockdep(dev->irq);
261 netif_wake_queue(dev);
262 }
264 /**
265 * ei_start_xmit - begin packet transmission
266 * @skb: packet to be sent
267 * @dev: network device to which packet is sent
268 *
269 * Sends a packet to an 8390 network device.
270 */
272 static int ei_start_xmit(struct sk_buff *skb, struct net_device *dev)
273 {
274 long e8390_base = dev->base_addr;
275 struct ei_device *ei_local = (struct ei_device *) netdev_priv(dev);
276 int send_length = skb->len, output_page;
277 unsigned long flags;
278 char buf[ETH_ZLEN];
279 char *data = skb->data;
281 if (skb->len < ETH_ZLEN) {
282 memset(buf, 0, ETH_ZLEN); /* more efficient than doing just the needed bits */
283 memcpy(buf, data, skb->len);
284 send_length = ETH_ZLEN;
285 data = buf;
286 }
288 /* Mask interrupts from the ethercard.
289 SMP: We have to grab the lock here otherwise the IRQ handler
290 on another CPU can flip window and race the IRQ mask set. We end
291 up trashing the mcast filter not disabling irqs if we don't lock */
293 spin_lock_irqsave(&ei_local->page_lock, flags);
294 outb_p(0x00, e8390_base + EN0_IMR);
295 spin_unlock_irqrestore(&ei_local->page_lock, flags);
298 /*
299 * Slow phase with lock held.
300 */
302 disable_irq_nosync(dev->irq);
304 spin_lock(&ei_local->page_lock);
306 ei_local->irqlock = 1;
308 /*
309 * We have two Tx slots available for use. Find the first free
310 * slot, and then perform some sanity checks. With two Tx bufs,
311 * you get very close to transmitting back-to-back packets. With
312 * only one Tx buf, the transmitter sits idle while you reload the
313 * card, leaving a substantial gap between each transmitted packet.
314 */
316 if (ei_local->tx1 == 0)
317 {
318 output_page = ei_local->tx_start_page;
319 ei_local->tx1 = send_length;
320 if (ei_debug && ei_local->tx2 > 0)
321 printk(KERN_DEBUG "%s: idle transmitter tx2=%d, lasttx=%d, txing=%d.\n",
322 dev->name, ei_local->tx2, ei_local->lasttx, ei_local->txing);
323 }
324 else if (ei_local->tx2 == 0)
325 {
326 output_page = ei_local->tx_start_page + TX_PAGES/2;
327 ei_local->tx2 = send_length;
328 if (ei_debug && ei_local->tx1 > 0)
329 printk(KERN_DEBUG "%s: idle transmitter, tx1=%d, lasttx=%d, txing=%d.\n",
330 dev->name, ei_local->tx1, ei_local->lasttx, ei_local->txing);
331 }
332 else
333 { /* We should never get here. */
334 if (ei_debug)
335 printk(KERN_DEBUG "%s: No Tx buffers free! tx1=%d tx2=%d last=%d\n",
336 dev->name, ei_local->tx1, ei_local->tx2, ei_local->lasttx);
337 ei_local->irqlock = 0;
338 netif_stop_queue(dev);
339 outb_p(ENISR_ALL, e8390_base + EN0_IMR);
340 spin_unlock(&ei_local->page_lock);
341 enable_irq(dev->irq);
342 ei_local->stat.tx_errors++;
343 return 1;
344 }
346 /*
347 * Okay, now upload the packet and trigger a send if the transmitter
348 * isn't already sending. If it is busy, the interrupt handler will
349 * trigger the send later, upon receiving a Tx done interrupt.
350 */
352 ei_block_output(dev, send_length, data, output_page);
354 if (! ei_local->txing)
355 {
356 ei_local->txing = 1;
357 NS8390_trigger_send(dev, send_length, output_page);
358 dev->trans_start = jiffies;
359 if (output_page == ei_local->tx_start_page)
360 {
361 ei_local->tx1 = -1;
362 ei_local->lasttx = -1;
363 }
364 else
365 {
366 ei_local->tx2 = -1;
367 ei_local->lasttx = -2;
368 }
369 }
370 else ei_local->txqueue++;
372 if (ei_local->tx1 && ei_local->tx2)
373 netif_stop_queue(dev);
374 else
375 netif_start_queue(dev);
377 /* Turn 8390 interrupts back on. */
378 ei_local->irqlock = 0;
379 outb_p(ENISR_ALL, e8390_base + EN0_IMR);
381 spin_unlock(&ei_local->page_lock);
382 enable_irq(dev->irq);
384 dev_kfree_skb (skb);
385 ei_local->stat.tx_bytes += send_length;
387 return 0;
388 }
390 /**
391 * ei_interrupt - handle the interrupts from an 8390
392 * @irq: interrupt number
393 * @dev_id: a pointer to the net_device
394 * @regs: unused
395 *
396 * Handle the ether interface interrupts. We pull packets from
397 * the 8390 via the card specific functions and fire them at the networking
398 * stack. We also handle transmit completions and wake the transmit path if
399 * necessary. We also update the counters and do other housekeeping as
400 * needed.
401 */
403 irqreturn_t ei_interrupt(int irq, void *dev_id, struct pt_regs * regs)
404 {
405 struct net_device *dev = dev_id;
406 long e8390_base;
407 int interrupts, nr_serviced = 0;
408 struct ei_device *ei_local;
410 if (dev == NULL)
411 {
412 printk ("net_interrupt(): irq %d for unknown device.\n", irq);
413 return IRQ_NONE;
414 }
416 e8390_base = dev->base_addr;
417 ei_local = (struct ei_device *) netdev_priv(dev);
419 /*
420 * Protect the irq test too.
421 */
423 spin_lock(&ei_local->page_lock);
425 if (ei_local->irqlock)
426 {
427 #if 1 /* This might just be an interrupt for a PCI device sharing this line */
428 /* The "irqlock" check is only for testing. */
429 printk(ei_local->irqlock
430 ? "%s: Interrupted while interrupts are masked! isr=%#2x imr=%#2x.\n"
431 : "%s: Reentering the interrupt handler! isr=%#2x imr=%#2x.\n",
432 dev->name, inb_p(e8390_base + EN0_ISR),
433 inb_p(e8390_base + EN0_IMR));
434 #endif
435 spin_unlock(&ei_local->page_lock);
436 return IRQ_NONE;
437 }
439 /* Change to page 0 and read the intr status reg. */
440 outb_p(E8390_NODMA+E8390_PAGE0, e8390_base + E8390_CMD);
441 if (ei_debug > 3)
442 printk(KERN_DEBUG "%s: interrupt(isr=%#2.2x).\n", dev->name,
443 inb_p(e8390_base + EN0_ISR));
445 /* !!Assumption!! -- we stay in page 0. Don't break this. */
446 while ((interrupts = inb_p(e8390_base + EN0_ISR)) != 0
447 && ++nr_serviced < MAX_SERVICE)
448 {
449 if (!netif_running(dev)) {
450 printk(KERN_WARNING "%s: interrupt from stopped card\n", dev->name);
451 /* rmk - acknowledge the interrupts */
452 outb_p(interrupts, e8390_base + EN0_ISR);
453 interrupts = 0;
454 break;
455 }
456 if (interrupts & ENISR_OVER)
457 ei_rx_overrun(dev);
458 else if (interrupts & (ENISR_RX+ENISR_RX_ERR))
459 {
460 /* Got a good (?) packet. */
461 ei_receive(dev);
462 }
463 /* Push the next to-transmit packet through. */
464 if (interrupts & ENISR_TX)
465 ei_tx_intr(dev);
466 else if (interrupts & ENISR_TX_ERR)
467 ei_tx_err(dev);
469 if (interrupts & ENISR_COUNTERS)
470 {
471 ei_local->stat.rx_frame_errors += inb_p(e8390_base + EN0_COUNTER0);
472 ei_local->stat.rx_crc_errors += inb_p(e8390_base + EN0_COUNTER1);
473 ei_local->stat.rx_missed_errors+= inb_p(e8390_base + EN0_COUNTER2);
474 outb_p(ENISR_COUNTERS, e8390_base + EN0_ISR); /* Ack intr. */
475 }
477 /* Ignore any RDC interrupts that make it back to here. */
478 if (interrupts & ENISR_RDC)
479 {
480 outb_p(ENISR_RDC, e8390_base + EN0_ISR);
481 }
483 outb_p(E8390_NODMA+E8390_PAGE0+E8390_START, e8390_base + E8390_CMD);
484 }
486 if (interrupts && ei_debug)
487 {
488 outb_p(E8390_NODMA+E8390_PAGE0+E8390_START, e8390_base + E8390_CMD);
489 if (nr_serviced >= MAX_SERVICE)
490 {
491 /* 0xFF is valid for a card removal */
492 if(interrupts!=0xFF)
493 printk(KERN_WARNING "%s: Too much work at interrupt, status %#2.2x\n",
494 dev->name, interrupts);
495 outb_p(ENISR_ALL, e8390_base + EN0_ISR); /* Ack. most intrs. */
496 } else {
497 printk(KERN_WARNING "%s: unknown interrupt %#2x\n", dev->name, interrupts);
498 outb_p(0xff, e8390_base + EN0_ISR); /* Ack. all intrs. */
499 }
500 }
501 spin_unlock(&ei_local->page_lock);
502 return IRQ_RETVAL(nr_serviced > 0);
503 }
505 #ifdef CONFIG_NET_POLL_CONTROLLER
506 void ei_poll(struct net_device *dev)
507 {
508 disable_irq(dev->irq);
509 ei_interrupt(dev->irq, dev, NULL);
510 enable_irq(dev->irq);
511 }
512 #endif
514 /**
515 * ei_tx_err - handle transmitter error
516 * @dev: network device which threw the exception
517 *
518 * A transmitter error has happened. Most likely excess collisions (which
519 * is a fairly normal condition). If the error is one where the Tx will
520 * have been aborted, we try and send another one right away, instead of
521 * letting the failed packet sit and collect dust in the Tx buffer. This
522 * is a much better solution as it avoids kernel based Tx timeouts, and
523 * an unnecessary card reset.
524 *
525 * Called with lock held.
526 */
528 static void ei_tx_err(struct net_device *dev)
529 {
530 long e8390_base = dev->base_addr;
531 struct ei_device *ei_local = (struct ei_device *) netdev_priv(dev);
532 unsigned char txsr = inb_p(e8390_base+EN0_TSR);
533 unsigned char tx_was_aborted = txsr & (ENTSR_ABT+ENTSR_FU);
535 #ifdef VERBOSE_ERROR_DUMP
536 printk(KERN_DEBUG "%s: transmitter error (%#2x): ", dev->name, txsr);
537 if (txsr & ENTSR_ABT)
538 printk("excess-collisions ");
539 if (txsr & ENTSR_ND)
540 printk("non-deferral ");
541 if (txsr & ENTSR_CRS)
542 printk("lost-carrier ");
543 if (txsr & ENTSR_FU)
544 printk("FIFO-underrun ");
545 if (txsr & ENTSR_CDH)
546 printk("lost-heartbeat ");
547 printk("\n");
548 #endif
550 outb_p(ENISR_TX_ERR, e8390_base + EN0_ISR); /* Ack intr. */
552 if (tx_was_aborted)
553 ei_tx_intr(dev);
554 else
555 {
556 ei_local->stat.tx_errors++;
557 if (txsr & ENTSR_CRS) ei_local->stat.tx_carrier_errors++;
558 if (txsr & ENTSR_CDH) ei_local->stat.tx_heartbeat_errors++;
559 if (txsr & ENTSR_OWC) ei_local->stat.tx_window_errors++;
560 }
561 }
563 /**
564 * ei_tx_intr - transmit interrupt handler
565 * @dev: network device for which tx intr is handled
566 *
567 * We have finished a transmit: check for errors and then trigger the next
568 * packet to be sent. Called with lock held.
569 */
571 static void ei_tx_intr(struct net_device *dev)
572 {
573 long e8390_base = dev->base_addr;
574 struct ei_device *ei_local = (struct ei_device *) netdev_priv(dev);
575 int status = inb(e8390_base + EN0_TSR);
577 outb_p(ENISR_TX, e8390_base + EN0_ISR); /* Ack intr. */
579 /*
580 * There are two Tx buffers, see which one finished, and trigger
581 * the send of another one if it exists.
582 */
583 ei_local->txqueue--;
585 if (ei_local->tx1 < 0)
586 {
587 if (ei_local->lasttx != 1 && ei_local->lasttx != -1)
588 printk(KERN_ERR "%s: bogus last_tx_buffer %d, tx1=%d.\n",
589 ei_local->name, ei_local->lasttx, ei_local->tx1);
590 ei_local->tx1 = 0;
591 if (ei_local->tx2 > 0)
592 {
593 ei_local->txing = 1;
594 NS8390_trigger_send(dev, ei_local->tx2, ei_local->tx_start_page + 6);
595 dev->trans_start = jiffies;
596 ei_local->tx2 = -1,
597 ei_local->lasttx = 2;
598 }
599 else ei_local->lasttx = 20, ei_local->txing = 0;
600 }
601 else if (ei_local->tx2 < 0)
602 {
603 if (ei_local->lasttx != 2 && ei_local->lasttx != -2)
604 printk("%s: bogus last_tx_buffer %d, tx2=%d.\n",
605 ei_local->name, ei_local->lasttx, ei_local->tx2);
606 ei_local->tx2 = 0;
607 if (ei_local->tx1 > 0)
608 {
609 ei_local->txing = 1;
610 NS8390_trigger_send(dev, ei_local->tx1, ei_local->tx_start_page);
611 dev->trans_start = jiffies;
612 ei_local->tx1 = -1;
613 ei_local->lasttx = 1;
614 }
615 else
616 ei_local->lasttx = 10, ei_local->txing = 0;
617 }
618 // else printk(KERN_WARNING "%s: unexpected TX-done interrupt, lasttx=%d.\n",
619 // dev->name, ei_local->lasttx);
621 /* Minimize Tx latency: update the statistics after we restart TXing. */
622 if (status & ENTSR_COL)
623 ei_local->stat.collisions++;
624 if (status & ENTSR_PTX)
625 ei_local->stat.tx_packets++;
626 else
627 {
628 ei_local->stat.tx_errors++;
629 if (status & ENTSR_ABT)
630 {
631 ei_local->stat.tx_aborted_errors++;
632 ei_local->stat.collisions += 16;
633 }
634 if (status & ENTSR_CRS)
635 ei_local->stat.tx_carrier_errors++;
636 if (status & ENTSR_FU)
637 ei_local->stat.tx_fifo_errors++;
638 if (status & ENTSR_CDH)
639 ei_local->stat.tx_heartbeat_errors++;
640 if (status & ENTSR_OWC)
641 ei_local->stat.tx_window_errors++;
642 }
643 netif_wake_queue(dev);
644 }
646 /**
647 * ei_receive - receive some packets
648 * @dev: network device with which receive will be run
649 *
650 * We have a good packet(s), get it/them out of the buffers.
651 * Called with lock held.
652 */
654 static void ei_receive(struct net_device *dev)
655 {
656 long e8390_base = dev->base_addr;
657 struct ei_device *ei_local = (struct ei_device *) netdev_priv(dev);
658 unsigned char rxing_page, this_frame, next_frame;
659 unsigned short current_offset;
660 int rx_pkt_count = 0;
661 struct e8390_pkt_hdr rx_frame;
662 int num_rx_pages = ei_local->stop_page-ei_local->rx_start_page;
664 while (++rx_pkt_count < 10)
665 {
666 int pkt_len, pkt_stat;
668 /* Get the rx page (incoming packet pointer). */
669 outb_p(E8390_NODMA+E8390_PAGE1, e8390_base + E8390_CMD);
670 rxing_page = inb_p(e8390_base + EN1_CURPAG);
671 outb_p(E8390_NODMA+E8390_PAGE0, e8390_base + E8390_CMD);
673 /* Remove one frame from the ring. Boundary is always a page behind. */
674 this_frame = inb_p(e8390_base + EN0_BOUNDARY) + 1;
675 if (this_frame >= ei_local->stop_page)
676 this_frame = ei_local->rx_start_page;
678 /* Someday we'll omit the previous, iff we never get this message.
679 (There is at least one clone claimed to have a problem.)
681 Keep quiet if it looks like a card removal. One problem here
682 is that some clones crash in roughly the same way.
683 */
684 if (ei_debug > 0 && this_frame != ei_local->current_page && (this_frame!=0x0 || rxing_page!=0xFF))
685 printk(KERN_ERR "%s: mismatched read page pointers %2x vs %2x.\n",
686 dev->name, this_frame, ei_local->current_page);
688 if (this_frame == rxing_page) /* Read all the frames? */
689 break; /* Done for now */
691 current_offset = this_frame << 8;
692 ei_get_8390_hdr(dev, &rx_frame, this_frame);
694 pkt_len = rx_frame.count - sizeof(struct e8390_pkt_hdr);
695 pkt_stat = rx_frame.status;
697 next_frame = this_frame + 1 + ((pkt_len+4)>>8);
699 /* Check for bogosity warned by 3c503 book: the status byte is never
700 written. This happened a lot during testing! This code should be
701 cleaned up someday. */
702 if (rx_frame.next != next_frame
703 && rx_frame.next != next_frame + 1
704 && rx_frame.next != next_frame - num_rx_pages
705 && rx_frame.next != next_frame + 1 - num_rx_pages) {
706 ei_local->current_page = rxing_page;
707 outb(ei_local->current_page-1, e8390_base+EN0_BOUNDARY);
708 ei_local->stat.rx_errors++;
709 continue;
710 }
712 if (pkt_len < 60 || pkt_len > 1518)
713 {
714 if (ei_debug)
715 printk(KERN_DEBUG "%s: bogus packet size: %d, status=%#2x nxpg=%#2x.\n",
716 dev->name, rx_frame.count, rx_frame.status,
717 rx_frame.next);
718 ei_local->stat.rx_errors++;
719 ei_local->stat.rx_length_errors++;
720 }
721 else if ((pkt_stat & 0x0F) == ENRSR_RXOK)
722 {
723 struct sk_buff *skb;
725 skb = dev_alloc_skb(pkt_len+2);
726 if (skb == NULL)
727 {
728 if (ei_debug > 1)
729 printk(KERN_DEBUG "%s: Couldn't allocate a sk_buff of size %d.\n",
730 dev->name, pkt_len);
731 ei_local->stat.rx_dropped++;
732 break;
733 }
734 else
735 {
736 skb_reserve(skb,2); /* IP headers on 16 byte boundaries */
737 skb->dev = dev;
738 skb_put(skb, pkt_len); /* Make room */
739 ei_block_input(dev, pkt_len, skb, current_offset + sizeof(rx_frame));
740 skb->protocol=eth_type_trans(skb,dev);
741 netif_rx(skb);
742 dev->last_rx = jiffies;
743 ei_local->stat.rx_packets++;
744 ei_local->stat.rx_bytes += pkt_len;
745 if (pkt_stat & ENRSR_PHY)
746 ei_local->stat.multicast++;
747 }
748 }
749 else
750 {
751 if (ei_debug)
752 printk(KERN_DEBUG "%s: bogus packet: status=%#2x nxpg=%#2x size=%d\n",
753 dev->name, rx_frame.status, rx_frame.next,
754 rx_frame.count);
755 ei_local->stat.rx_errors++;
756 /* NB: The NIC counts CRC, frame and missed errors. */
757 if (pkt_stat & ENRSR_FO)
758 ei_local->stat.rx_fifo_errors++;
759 }
760 next_frame = rx_frame.next;
762 /* This _should_ never happen: it's here for avoiding bad clones. */
763 if (next_frame >= ei_local->stop_page) {
764 printk("%s: next frame inconsistency, %#2x\n", dev->name,
765 next_frame);
766 next_frame = ei_local->rx_start_page;
767 }
768 ei_local->current_page = next_frame;
769 outb_p(next_frame-1, e8390_base+EN0_BOUNDARY);
770 }
772 /* We used to also ack ENISR_OVER here, but that would sometimes mask
773 a real overrun, leaving the 8390 in a stopped state with rec'vr off. */
774 outb_p(ENISR_RX+ENISR_RX_ERR, e8390_base+EN0_ISR);
775 return;
776 }
778 /**
779 * ei_rx_overrun - handle receiver overrun
780 * @dev: network device which threw exception
781 *
782 * We have a receiver overrun: we have to kick the 8390 to get it started
783 * again. Problem is that you have to kick it exactly as NS prescribes in
784 * the updated datasheets, or "the NIC may act in an unpredictable manner."
785 * This includes causing "the NIC to defer indefinitely when it is stopped
786 * on a busy network." Ugh.
787 * Called with lock held. Don't call this with the interrupts off or your
788 * computer will hate you - it takes 10ms or so.
789 */
791 static void ei_rx_overrun(struct net_device *dev)
792 {
793 long e8390_base = dev->base_addr;
794 unsigned char was_txing, must_resend = 0;
795 struct ei_device *ei_local = (struct ei_device *) netdev_priv(dev);
797 /*
798 * Record whether a Tx was in progress and then issue the
799 * stop command.
800 */
801 was_txing = inb_p(e8390_base+E8390_CMD) & E8390_TRANS;
802 outb_p(E8390_NODMA+E8390_PAGE0+E8390_STOP, e8390_base+E8390_CMD);
804 if (ei_debug > 1)
805 printk(KERN_DEBUG "%s: Receiver overrun.\n", dev->name);
806 ei_local->stat.rx_over_errors++;
808 /*
809 * Wait a full Tx time (1.2ms) + some guard time, NS says 1.6ms total.
810 * Early datasheets said to poll the reset bit, but now they say that
811 * it "is not a reliable indicator and subsequently should be ignored."
812 * We wait at least 10ms.
813 */
815 mdelay(10);
817 /*
818 * Reset RBCR[01] back to zero as per magic incantation.
819 */
820 outb_p(0x00, e8390_base+EN0_RCNTLO);
821 outb_p(0x00, e8390_base+EN0_RCNTHI);
823 /*
824 * See if any Tx was interrupted or not. According to NS, this
825 * step is vital, and skipping it will cause no end of havoc.
826 */
828 if (was_txing)
829 {
830 unsigned char tx_completed = inb_p(e8390_base+EN0_ISR) & (ENISR_TX+ENISR_TX_ERR);
831 if (!tx_completed)
832 must_resend = 1;
833 }
835 /*
836 * Have to enter loopback mode and then restart the NIC before
837 * you are allowed to slurp packets up off the ring.
838 */
839 outb_p(E8390_TXOFF, e8390_base + EN0_TXCR);
840 outb_p(E8390_NODMA + E8390_PAGE0 + E8390_START, e8390_base + E8390_CMD);
842 /*
843 * Clear the Rx ring of all the debris, and ack the interrupt.
844 */
845 ei_receive(dev);
846 outb_p(ENISR_OVER, e8390_base+EN0_ISR);
848 /*
849 * Leave loopback mode, and resend any packet that got stopped.
850 */
851 outb_p(E8390_TXCONFIG, e8390_base + EN0_TXCR);
852 if (must_resend)
853 outb_p(E8390_NODMA + E8390_PAGE0 + E8390_START + E8390_TRANS, e8390_base + E8390_CMD);
854 }
856 /*
857 * Collect the stats. This is called unlocked and from several contexts.
858 */
860 static struct net_device_stats *get_stats(struct net_device *dev)
861 {
862 long ioaddr = dev->base_addr;
863 struct ei_device *ei_local = (struct ei_device *) netdev_priv(dev);
864 unsigned long flags;
866 /* If the card is stopped, just return the present stats. */
867 if (!netif_running(dev))
868 return &ei_local->stat;
870 spin_lock_irqsave(&ei_local->page_lock,flags);
871 /* Read the counter registers, assuming we are in page 0. */
872 ei_local->stat.rx_frame_errors += inb_p(ioaddr + EN0_COUNTER0);
873 ei_local->stat.rx_crc_errors += inb_p(ioaddr + EN0_COUNTER1);
874 ei_local->stat.rx_missed_errors+= inb_p(ioaddr + EN0_COUNTER2);
875 spin_unlock_irqrestore(&ei_local->page_lock, flags);
877 return &ei_local->stat;
878 }
880 /*
881 * Form the 64 bit 8390 multicast table from the linked list of addresses
882 * associated with this dev structure.
883 */
885 static inline void make_mc_bits(u8 *bits, struct net_device *dev)
886 {
887 struct dev_mc_list *dmi;
889 for (dmi=dev->mc_list; dmi; dmi=dmi->next)
890 {
891 u32 crc;
892 if (dmi->dmi_addrlen != ETH_ALEN)
893 {
894 printk(KERN_INFO "%s: invalid multicast address length given.\n", dev->name);
895 continue;
896 }
897 crc = ether_crc(ETH_ALEN, dmi->dmi_addr);
898 /*
899 * The 8390 uses the 6 most significant bits of the
900 * CRC to index the multicast table.
901 */
902 bits[crc>>29] |= (1<<((crc>>26)&7));
903 }
904 }
906 /**
907 * do_set_multicast_list - set/clear multicast filter
908 * @dev: net device for which multicast filter is adjusted
909 *
910 * Set or clear the multicast filter for this adaptor. May be called
911 * from a BH in 2.1.x. Must be called with lock held.
912 */
914 static void do_set_multicast_list(struct net_device *dev)
915 {
916 long e8390_base = dev->base_addr;
917 int i;
918 struct ei_device *ei_local = (struct ei_device*)netdev_priv(dev);
920 if (!(dev->flags&(IFF_PROMISC|IFF_ALLMULTI)))
921 {
922 memset(ei_local->mcfilter, 0, 8);
923 if (dev->mc_list)
924 make_mc_bits(ei_local->mcfilter, dev);
925 }
926 else
927 memset(ei_local->mcfilter, 0xFF, 8); /* mcast set to accept-all */
929 /*
930 * DP8390 manuals don't specify any magic sequence for altering
931 * the multicast regs on an already running card. To be safe, we
932 * ensure multicast mode is off prior to loading up the new hash
933 * table. If this proves to be not enough, we can always resort
934 * to stopping the NIC, loading the table and then restarting.
935 *
936 * Bug Alert! The MC regs on the SMC 83C690 (SMC Elite and SMC
937 * Elite16) appear to be write-only. The NS 8390 data sheet lists
938 * them as r/w so this is a bug. The SMC 83C790 (SMC Ultra and
939 * Ultra32 EISA) appears to have this bug fixed.
940 */
942 if (netif_running(dev))
943 outb_p(E8390_RXCONFIG, e8390_base + EN0_RXCR);
944 outb_p(E8390_NODMA + E8390_PAGE1, e8390_base + E8390_CMD);
945 for(i = 0; i < 8; i++)
946 {
947 outb_p(ei_local->mcfilter[i], e8390_base + EN1_MULT_SHIFT(i));
948 #ifndef BUG_83C690
949 if(inb_p(e8390_base + EN1_MULT_SHIFT(i))!=ei_local->mcfilter[i])
950 printk(KERN_ERR "Multicast filter read/write mismap %d\n",i);
951 #endif
952 }
953 outb_p(E8390_NODMA + E8390_PAGE0, e8390_base + E8390_CMD);
955 if(dev->flags&IFF_PROMISC)
956 outb_p(E8390_RXCONFIG | 0x18, e8390_base + EN0_RXCR);
957 else if(dev->flags&IFF_ALLMULTI || dev->mc_list)
958 outb_p(E8390_RXCONFIG | 0x08, e8390_base + EN0_RXCR);
959 else
960 outb_p(E8390_RXCONFIG, e8390_base + EN0_RXCR);
961 }
963 /*
964 * Called without lock held. This is invoked from user context and may
965 * be parallel to just about everything else. Its also fairly quick and
966 * not called too often. Must protect against both bh and irq users
967 */
969 static void set_multicast_list(struct net_device *dev)
970 {
971 unsigned long flags;
972 struct ei_device *ei_local = (struct ei_device*)netdev_priv(dev);
974 spin_lock_irqsave(&ei_local->page_lock, flags);
975 do_set_multicast_list(dev);
976 spin_unlock_irqrestore(&ei_local->page_lock, flags);
977 }
979 /**
980 * ethdev_setup - init rest of 8390 device struct
981 * @dev: network device structure to init
982 *
983 * Initialize the rest of the 8390 device structure. Do NOT __init
984 * this, as it is used by 8390 based modular drivers too.
985 */
987 static void ethdev_setup(struct net_device *dev)
988 {
989 struct ei_device *ei_local = (struct ei_device *) netdev_priv(dev);
990 if (ei_debug > 1)
991 printk(version);
993 dev->hard_start_xmit = &ei_start_xmit;
994 dev->get_stats = get_stats;
995 dev->set_multicast_list = &set_multicast_list;
997 ether_setup(dev);
999 spin_lock_init(&ei_local->page_lock);
1002 /**
1003 * alloc_ei_netdev - alloc_etherdev counterpart for 8390
1004 * @size: extra bytes to allocate
1006 * Allocate 8390-specific net_device.
1007 */
1008 struct net_device *__alloc_ei_netdev(int size)
1010 return alloc_netdev(sizeof(struct ei_device) + size, "eth%d",
1011 ethdev_setup);
1017 /* This page of functions should be 8390 generic */
1018 /* Follow National Semi's recommendations for initializing the "NIC". */
1020 /**
1021 * NS8390_init - initialize 8390 hardware
1022 * @dev: network device to initialize
1023 * @startp: boolean. non-zero value to initiate chip processing
1025 * Must be called with lock held.
1026 */
1028 void NS8390_init(struct net_device *dev, int startp)
1030 long e8390_base = dev->base_addr;
1031 struct ei_device *ei_local = (struct ei_device *) netdev_priv(dev);
1032 int i;
1033 int endcfg = ei_local->word16
1034 ? (0x48 | ENDCFG_WTS | (ei_local->bigendian ? ENDCFG_BOS : 0))
1035 : 0x48;
1037 if(sizeof(struct e8390_pkt_hdr)!=4)
1038 panic("8390.c: header struct mispacked\n");
1039 /* Follow National Semi's recommendations for initing the DP83902. */
1040 outb_p(E8390_NODMA+E8390_PAGE0+E8390_STOP, e8390_base+E8390_CMD); /* 0x21 */
1041 outb_p(endcfg, e8390_base + EN0_DCFG); /* 0x48 or 0x49 */
1042 /* Clear the remote byte count registers. */
1043 outb_p(0x00, e8390_base + EN0_RCNTLO);
1044 outb_p(0x00, e8390_base + EN0_RCNTHI);
1045 /* Set to monitor and loopback mode -- this is vital!. */
1046 outb_p(E8390_RXOFF, e8390_base + EN0_RXCR); /* 0x20 */
1047 outb_p(E8390_TXOFF, e8390_base + EN0_TXCR); /* 0x02 */
1048 /* Set the transmit page and receive ring. */
1049 outb_p(ei_local->tx_start_page, e8390_base + EN0_TPSR);
1050 ei_local->tx1 = ei_local->tx2 = 0;
1051 outb_p(ei_local->rx_start_page, e8390_base + EN0_STARTPG);
1052 outb_p(ei_local->stop_page-1, e8390_base + EN0_BOUNDARY); /* 3c503 says 0x3f,NS0x26*/
1053 ei_local->current_page = ei_local->rx_start_page; /* assert boundary+1 */
1054 outb_p(ei_local->stop_page, e8390_base + EN0_STOPPG);
1055 /* Clear the pending interrupts and mask. */
1056 outb_p(0xFF, e8390_base + EN0_ISR);
1057 outb_p(0x00, e8390_base + EN0_IMR);
1059 /* Copy the station address into the DS8390 registers. */
1061 outb_p(E8390_NODMA + E8390_PAGE1 + E8390_STOP, e8390_base+E8390_CMD); /* 0x61 */
1062 for(i = 0; i < 6; i++)
1064 outb_p(dev->dev_addr[i], e8390_base + EN1_PHYS_SHIFT(i));
1065 if (ei_debug > 1 && inb_p(e8390_base + EN1_PHYS_SHIFT(i))!=dev->dev_addr[i])
1066 printk(KERN_ERR "Hw. address read/write mismap %d\n",i);
1069 outb_p(ei_local->rx_start_page, e8390_base + EN1_CURPAG);
1070 outb_p(E8390_NODMA+E8390_PAGE0+E8390_STOP, e8390_base+E8390_CMD);
1072 netif_start_queue(dev);
1073 ei_local->tx1 = ei_local->tx2 = 0;
1074 ei_local->txing = 0;
1076 if (startp)
1078 outb_p(0xff, e8390_base + EN0_ISR);
1079 outb_p(ENISR_ALL, e8390_base + EN0_IMR);
1080 outb_p(E8390_NODMA+E8390_PAGE0+E8390_START, e8390_base+E8390_CMD);
1081 outb_p(E8390_TXCONFIG, e8390_base + EN0_TXCR); /* xmit on. */
1082 /* 3c503 TechMan says rxconfig only after the NIC is started. */
1083 outb_p(E8390_RXCONFIG, e8390_base + EN0_RXCR); /* rx on, */
1084 do_set_multicast_list(dev); /* (re)load the mcast table */
1088 /* Trigger a transmit start, assuming the length is valid.
1089 Always called with the page lock held */
1091 static void NS8390_trigger_send(struct net_device *dev, unsigned int length,
1092 int start_page)
1094 long e8390_base = dev->base_addr;
1095 struct ei_device *ei_local __attribute((unused)) = (struct ei_device *) netdev_priv(dev);
1097 outb_p(E8390_NODMA+E8390_PAGE0, e8390_base+E8390_CMD);
1099 if (inb_p(e8390_base + E8390_CMD) & E8390_TRANS)
1101 printk(KERN_WARNING "%s: trigger_send() called with the transmitter busy.\n",
1102 dev->name);
1103 return;
1105 outb_p(length & 0xff, e8390_base + EN0_TCNTLO);
1106 outb_p(length >> 8, e8390_base + EN0_TCNTHI);
1107 outb_p(start_page, e8390_base + EN0_TPSR);
1108 outb_p(E8390_NODMA+E8390_TRANS+E8390_START, e8390_base+E8390_CMD);
1111 EXPORT_SYMBOL(ei_open);
1112 EXPORT_SYMBOL(ei_close);
1113 EXPORT_SYMBOL(ei_interrupt);
1114 #ifdef CONFIG_NET_POLL_CONTROLLER
1115 EXPORT_SYMBOL(ei_poll);
1116 #endif
1117 EXPORT_SYMBOL(NS8390_init);
1118 EXPORT_SYMBOL(__alloc_ei_netdev);
1120 #if defined(MODULE)
1122 int init_module(void)
1124 return 0;
1127 void cleanup_module(void)
1131 #endif /* MODULE */
1132 MODULE_LICENSE("GPL");