ia64/linux-2.6.18-xen.hg

view drivers/net/at1700.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 /* at1700.c: A network device driver for the Allied Telesis AT1700.
3 Written 1993-98 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
16 This is a device driver for the Allied Telesis AT1700, and
17 Fujitsu FMV-181/182/181A/182A/183/184/183A/184A, which are
18 straight-forward Fujitsu MB86965 implementations.
20 Modification for Fujitsu FMV-18X cards is done by Yutaka Tamiya
21 (tamy@flab.fujitsu.co.jp).
23 Sources:
24 The Fujitsu MB86965 datasheet.
26 After the initial version of this driver was written Gerry Sawkins of
27 ATI provided their EEPROM configuration code header file.
28 Thanks to NIIBE Yutaka <gniibe@mri.co.jp> for bug fixes.
30 MCA bus (AT1720) support by Rene Schmit <rene@bss.lu>
32 Bugs:
33 The MB86965 has a design flaw that makes all probes unreliable. Not
34 only is it difficult to detect, it also moves around in I/O space in
35 response to inb()s from other device probes!
36 */
38 #include <linux/errno.h>
39 #include <linux/netdevice.h>
40 #include <linux/etherdevice.h>
41 #include <linux/mca-legacy.h>
42 #include <linux/module.h>
43 #include <linux/kernel.h>
44 #include <linux/types.h>
45 #include <linux/fcntl.h>
46 #include <linux/interrupt.h>
47 #include <linux/ioport.h>
48 #include <linux/in.h>
49 #include <linux/skbuff.h>
50 #include <linux/slab.h>
51 #include <linux/string.h>
52 #include <linux/init.h>
53 #include <linux/crc32.h>
54 #include <linux/bitops.h>
56 #include <asm/system.h>
57 #include <asm/io.h>
58 #include <asm/dma.h>
60 static char version[] __initdata =
61 "at1700.c:v1.15 4/7/98 Donald Becker (becker@cesdis.gsfc.nasa.gov)\n";
63 #define DRV_NAME "at1700"
65 /* Tunable parameters. */
67 /* When to switch from the 64-entry multicast filter to Rx-all-multicast. */
68 #define MC_FILTERBREAK 64
70 /* These unusual address orders are used to verify the CONFIG register. */
72 static int fmv18x_probe_list[] __initdata = {
73 0x220, 0x240, 0x260, 0x280, 0x2a0, 0x2c0, 0x300, 0x340, 0
74 };
76 /*
77 * ISA
78 */
80 static unsigned at1700_probe_list[] __initdata = {
81 0x260, 0x280, 0x2a0, 0x240, 0x340, 0x320, 0x380, 0x300, 0
82 };
84 /*
85 * MCA
86 */
87 #ifdef CONFIG_MCA_LEGACY
88 static int at1700_ioaddr_pattern[] __initdata = {
89 0x00, 0x04, 0x01, 0x05, 0x02, 0x06, 0x03, 0x07
90 };
92 static int at1700_mca_probe_list[] __initdata = {
93 0x400, 0x1400, 0x2400, 0x3400, 0x4400, 0x5400, 0x6400, 0x7400, 0
94 };
96 static int at1700_irq_pattern[] __initdata = {
97 0x00, 0x00, 0x00, 0x30, 0x70, 0xb0, 0x00, 0x00,
98 0x00, 0xf0, 0x34, 0x74, 0xb4, 0x00, 0x00, 0xf4, 0x00
99 };
100 #endif
102 /* use 0 for production, 1 for verification, >2 for debug */
103 #ifndef NET_DEBUG
104 #define NET_DEBUG 1
105 #endif
106 static unsigned int net_debug = NET_DEBUG;
108 typedef unsigned char uchar;
110 /* Information that need to be kept for each board. */
111 struct net_local {
112 struct net_device_stats stats;
113 spinlock_t lock;
114 unsigned char mc_filter[8];
115 uint jumpered:1; /* Set iff the board has jumper config. */
116 uint tx_started:1; /* Packets are on the Tx queue. */
117 uint tx_queue_ready:1; /* Tx queue is ready to be sent. */
118 uint rx_started:1; /* Packets are Rxing. */
119 uchar tx_queue; /* Number of packet on the Tx queue. */
120 char mca_slot; /* -1 means ISA */
121 ushort tx_queue_len; /* Current length of the Tx queue. */
122 };
125 /* Offsets from the base address. */
126 #define STATUS 0
127 #define TX_STATUS 0
128 #define RX_STATUS 1
129 #define TX_INTR 2 /* Bit-mapped interrupt enable registers. */
130 #define RX_INTR 3
131 #define TX_MODE 4
132 #define RX_MODE 5
133 #define CONFIG_0 6 /* Misc. configuration settings. */
134 #define CONFIG_1 7
135 /* Run-time register bank 2 definitions. */
136 #define DATAPORT 8 /* Word-wide DMA or programmed-I/O dataport. */
137 #define TX_START 10
138 #define COL16CNTL 11 /* Controll Reg for 16 collisions */
139 #define MODE13 13
140 #define RX_CTRL 14
141 /* Configuration registers only on the '865A/B chips. */
142 #define EEPROM_Ctrl 16
143 #define EEPROM_Data 17
144 #define CARDSTATUS 16 /* FMV-18x Card Status */
145 #define CARDSTATUS1 17 /* FMV-18x Card Status */
146 #define IOCONFIG 18 /* Either read the jumper, or move the I/O. */
147 #define IOCONFIG1 19
148 #define SAPROM 20 /* The station address PROM, if no EEPROM. */
149 #define MODE24 24
150 #define RESET 31 /* Write to reset some parts of the chip. */
151 #define AT1700_IO_EXTENT 32
152 #define PORT_OFFSET(o) (o)
155 #define TX_TIMEOUT 10
158 /* Index to functions, as function prototypes. */
160 static int at1700_probe1(struct net_device *dev, int ioaddr);
161 static int read_eeprom(long ioaddr, int location);
162 static int net_open(struct net_device *dev);
163 static int net_send_packet(struct sk_buff *skb, struct net_device *dev);
164 static irqreturn_t net_interrupt(int irq, void *dev_id, struct pt_regs *regs);
165 static void net_rx(struct net_device *dev);
166 static int net_close(struct net_device *dev);
167 static struct net_device_stats *net_get_stats(struct net_device *dev);
168 static void set_rx_mode(struct net_device *dev);
169 static void net_tx_timeout (struct net_device *dev);
172 #ifdef CONFIG_MCA_LEGACY
173 struct at1720_mca_adapters_struct {
174 char* name;
175 int id;
176 };
177 /* rEnE : maybe there are others I don't know off... */
179 static struct at1720_mca_adapters_struct at1720_mca_adapters[] __initdata = {
180 { "Allied Telesys AT1720AT", 0x6410 },
181 { "Allied Telesys AT1720BT", 0x6413 },
182 { "Allied Telesys AT1720T", 0x6416 },
183 { NULL, 0 },
184 };
185 #endif
187 /* Check for a network adaptor of this type, and return '0' iff one exists.
188 If dev->base_addr == 0, probe all likely locations.
189 If dev->base_addr == 1, always return failure.
190 If dev->base_addr == 2, allocate space for the device and return success
191 (detachable devices only).
192 */
194 static int io = 0x260;
196 static int irq;
198 static void cleanup_card(struct net_device *dev)
199 {
200 #ifdef CONFIG_MCA_LEGACY
201 struct net_local *lp = netdev_priv(dev);
202 if (lp->mca_slot >= 0)
203 mca_mark_as_unused(lp->mca_slot);
204 #endif
205 free_irq(dev->irq, NULL);
206 release_region(dev->base_addr, AT1700_IO_EXTENT);
207 }
209 struct net_device * __init at1700_probe(int unit)
210 {
211 struct net_device *dev = alloc_etherdev(sizeof(struct net_local));
212 unsigned *port;
213 int err = 0;
215 if (!dev)
216 return ERR_PTR(-ENODEV);
218 if (unit >= 0) {
219 sprintf(dev->name, "eth%d", unit);
220 netdev_boot_setup_check(dev);
221 io = dev->base_addr;
222 irq = dev->irq;
223 } else {
224 dev->base_addr = io;
225 dev->irq = irq;
226 }
228 SET_MODULE_OWNER(dev);
230 if (io > 0x1ff) { /* Check a single specified location. */
231 err = at1700_probe1(dev, io);
232 } else if (io != 0) { /* Don't probe at all. */
233 err = -ENXIO;
234 } else {
235 for (port = at1700_probe_list; *port; port++) {
236 if (at1700_probe1(dev, *port) == 0)
237 break;
238 dev->irq = irq;
239 }
240 if (!*port)
241 err = -ENODEV;
242 }
243 if (err)
244 goto out;
245 err = register_netdev(dev);
246 if (err)
247 goto out1;
248 return dev;
249 out1:
250 cleanup_card(dev);
251 out:
252 free_netdev(dev);
253 return ERR_PTR(err);
254 }
256 /* The Fujitsu datasheet suggests that the NIC be probed for by checking its
257 "signature", the default bit pattern after a reset. This *doesn't* work --
258 there is no way to reset the bus interface without a complete power-cycle!
260 It turns out that ATI came to the same conclusion I did: the only thing
261 that can be done is checking a few bits and then diving right into an
262 EEPROM read. */
264 static int __init at1700_probe1(struct net_device *dev, int ioaddr)
265 {
266 char fmv_irqmap[4] = {3, 7, 10, 15};
267 char fmv_irqmap_pnp[8] = {3, 4, 5, 7, 9, 10, 11, 15};
268 char at1700_irqmap[8] = {3, 4, 5, 9, 10, 11, 14, 15};
269 unsigned int i, irq, is_fmv18x = 0, is_at1700 = 0;
270 int slot, ret = -ENODEV;
271 struct net_local *lp = netdev_priv(dev);
273 if (!request_region(ioaddr, AT1700_IO_EXTENT, DRV_NAME))
274 return -EBUSY;
276 /* Resetting the chip doesn't reset the ISA interface, so don't bother.
277 That means we have to be careful with the register values we probe
278 for.
279 */
280 #ifdef notdef
281 printk("at1700 probe at %#x, eeprom is %4.4x %4.4x %4.4x ctrl %4.4x.\n",
282 ioaddr, read_eeprom(ioaddr, 4), read_eeprom(ioaddr, 5),
283 read_eeprom(ioaddr, 6), inw(ioaddr + EEPROM_Ctrl));
284 #endif
286 #ifdef CONFIG_MCA_LEGACY
287 /* rEnE (rene@bss.lu): got this from 3c509 driver source , adapted for AT1720 */
289 /* Based on Erik Nygren's (nygren@mit.edu) 3c529 patch, heavily
290 modified by Chris Beauregard (cpbeaure@csclub.uwaterloo.ca)
291 to support standard MCA probing. */
293 /* redone for multi-card detection by ZP Gu (zpg@castle.net) */
294 /* now works as a module */
296 if (MCA_bus) {
297 int j;
298 int l_i;
299 u_char pos3, pos4;
301 for (j = 0; at1720_mca_adapters[j].name != NULL; j ++) {
302 slot = 0;
303 while (slot != MCA_NOTFOUND) {
305 slot = mca_find_unused_adapter( at1720_mca_adapters[j].id, slot );
306 if (slot == MCA_NOTFOUND) break;
308 /* if we get this far, an adapter has been detected and is
309 enabled */
311 pos3 = mca_read_stored_pos( slot, 3 );
312 pos4 = mca_read_stored_pos( slot, 4 );
314 for (l_i = 0; l_i < 0x09; l_i++)
315 if (( pos3 & 0x07) == at1700_ioaddr_pattern[l_i])
316 break;
317 ioaddr = at1700_mca_probe_list[l_i];
319 for (irq = 0; irq < 0x10; irq++)
320 if (((((pos4>>4) & 0x0f) | (pos3 & 0xf0)) & 0xff) == at1700_irq_pattern[irq])
321 break;
323 /* probing for a card at a particular IO/IRQ */
324 if ((dev->irq && dev->irq != irq) ||
325 (dev->base_addr && dev->base_addr != ioaddr)) {
326 slot++; /* probing next slot */
327 continue;
328 }
330 dev->irq = irq;
332 /* claim the slot */
333 mca_set_adapter_name( slot, at1720_mca_adapters[j].name );
334 mca_mark_as_used(slot);
336 goto found;
337 }
338 }
339 /* if we get here, we didn't find an MCA adapter - try ISA */
340 }
341 #endif
342 slot = -1;
343 /* We must check for the EEPROM-config boards first, else accessing
344 IOCONFIG0 will move the board! */
345 if (at1700_probe_list[inb(ioaddr + IOCONFIG1) & 0x07] == ioaddr
346 && read_eeprom(ioaddr, 4) == 0x0000
347 && (read_eeprom(ioaddr, 5) & 0xff00) == 0xF400)
348 is_at1700 = 1;
349 else if (inb(ioaddr + SAPROM ) == 0x00
350 && inb(ioaddr + SAPROM + 1) == 0x00
351 && inb(ioaddr + SAPROM + 2) == 0x0e)
352 is_fmv18x = 1;
353 else {
354 goto err_out;
355 }
357 #ifdef CONFIG_MCA_LEGACY
358 found:
359 #endif
361 /* Reset the internal state machines. */
362 outb(0, ioaddr + RESET);
364 if (is_at1700) {
365 irq = at1700_irqmap[(read_eeprom(ioaddr, 12)&0x04)
366 | (read_eeprom(ioaddr, 0)>>14)];
367 } else {
368 /* Check PnP mode for FMV-183/184/183A/184A. */
369 /* This PnP routine is very poor. IO and IRQ should be known. */
370 if (inb(ioaddr + CARDSTATUS1) & 0x20) {
371 irq = dev->irq;
372 for (i = 0; i < 8; i++) {
373 if (irq == fmv_irqmap_pnp[i])
374 break;
375 }
376 if (i == 8) {
377 goto err_mca;
378 }
379 } else {
380 if (fmv18x_probe_list[inb(ioaddr + IOCONFIG) & 0x07] != ioaddr)
381 goto err_mca;
382 irq = fmv_irqmap[(inb(ioaddr + IOCONFIG)>>6) & 0x03];
383 }
384 }
386 printk("%s: %s found at %#3x, IRQ %d, address ", dev->name,
387 is_at1700 ? "AT1700" : "FMV-18X", ioaddr, irq);
389 dev->base_addr = ioaddr;
390 dev->irq = irq;
392 if (is_at1700) {
393 for(i = 0; i < 3; i++) {
394 unsigned short eeprom_val = read_eeprom(ioaddr, 4+i);
395 printk("%04x", eeprom_val);
396 ((unsigned short *)dev->dev_addr)[i] = ntohs(eeprom_val);
397 }
398 } else {
399 for(i = 0; i < 6; i++) {
400 unsigned char val = inb(ioaddr + SAPROM + i);
401 printk("%02x", val);
402 dev->dev_addr[i] = val;
403 }
404 }
406 /* The EEPROM word 12 bit 0x0400 means use regular 100 ohm 10baseT signals,
407 rather than 150 ohm shielded twisted pair compensation.
408 0x0000 == auto-sense the interface
409 0x0800 == use TP interface
410 0x1800 == use coax interface
411 */
412 {
413 const char *porttype[] = {"auto-sense", "10baseT", "auto-sense", "10base2"};
414 if (is_at1700) {
415 ushort setup_value = read_eeprom(ioaddr, 12);
416 dev->if_port = setup_value >> 8;
417 } else {
418 ushort setup_value = inb(ioaddr + CARDSTATUS);
419 switch (setup_value & 0x07) {
420 case 0x01: /* 10base5 */
421 case 0x02: /* 10base2 */
422 dev->if_port = 0x18; break;
423 case 0x04: /* 10baseT */
424 dev->if_port = 0x08; break;
425 default: /* auto-sense */
426 dev->if_port = 0x00; break;
427 }
428 }
429 printk(" %s interface.\n", porttype[(dev->if_port>>3) & 3]);
430 }
432 /* Set the configuration register 0 to 32K 100ns. byte-wide memory, 16 bit
433 bus access, two 4K Tx queues, and disabled Tx and Rx. */
434 outb(0xda, ioaddr + CONFIG_0);
436 /* Set the station address in bank zero. */
437 outb(0x00, ioaddr + CONFIG_1);
438 for (i = 0; i < 6; i++)
439 outb(dev->dev_addr[i], ioaddr + PORT_OFFSET(8 + i));
441 /* Switch to bank 1 and set the multicast table to accept none. */
442 outb(0x04, ioaddr + CONFIG_1);
443 for (i = 0; i < 8; i++)
444 outb(0x00, ioaddr + PORT_OFFSET(8 + i));
447 /* Switch to bank 2 */
448 /* Lock our I/O address, and set manual processing mode for 16 collisions. */
449 outb(0x08, ioaddr + CONFIG_1);
450 outb(dev->if_port, ioaddr + MODE13);
451 outb(0x00, ioaddr + COL16CNTL);
453 if (net_debug)
454 printk(version);
456 memset(lp, 0, sizeof(struct net_local));
458 dev->open = net_open;
459 dev->stop = net_close;
460 dev->hard_start_xmit = net_send_packet;
461 dev->get_stats = net_get_stats;
462 dev->set_multicast_list = &set_rx_mode;
463 dev->tx_timeout = net_tx_timeout;
464 dev->watchdog_timeo = TX_TIMEOUT;
466 spin_lock_init(&lp->lock);
468 lp->jumpered = is_fmv18x;
469 lp->mca_slot = slot;
470 /* Snarf the interrupt vector now. */
471 ret = request_irq(irq, &net_interrupt, 0, DRV_NAME, dev);
472 if (ret) {
473 printk (" AT1700 at %#3x is unusable due to a conflict on"
474 "IRQ %d.\n", ioaddr, irq);
475 goto err_mca;
476 }
478 return 0;
480 err_mca:
481 #ifdef CONFIG_MCA_LEGACY
482 if (slot >= 0)
483 mca_mark_as_unused(slot);
484 #endif
485 err_out:
486 release_region(ioaddr, AT1700_IO_EXTENT);
487 return ret;
488 }
491 /* EEPROM_Ctrl bits. */
492 #define EE_SHIFT_CLK 0x40 /* EEPROM shift clock, in reg. 16. */
493 #define EE_CS 0x20 /* EEPROM chip select, in reg. 16. */
494 #define EE_DATA_WRITE 0x80 /* EEPROM chip data in, in reg. 17. */
495 #define EE_DATA_READ 0x80 /* EEPROM chip data out, in reg. 17. */
497 /* The EEPROM commands include the alway-set leading bit. */
498 #define EE_WRITE_CMD (5 << 6)
499 #define EE_READ_CMD (6 << 6)
500 #define EE_ERASE_CMD (7 << 6)
502 static int __init read_eeprom(long ioaddr, int location)
503 {
504 int i;
505 unsigned short retval = 0;
506 long ee_addr = ioaddr + EEPROM_Ctrl;
507 long ee_daddr = ioaddr + EEPROM_Data;
508 int read_cmd = location | EE_READ_CMD;
510 /* Shift the read command bits out. */
511 for (i = 9; i >= 0; i--) {
512 short dataval = (read_cmd & (1 << i)) ? EE_DATA_WRITE : 0;
513 outb(EE_CS, ee_addr);
514 outb(dataval, ee_daddr);
515 outb(EE_CS | EE_SHIFT_CLK, ee_addr); /* EEPROM clock tick. */
516 }
517 outb(EE_DATA_WRITE, ee_daddr);
518 for (i = 16; i > 0; i--) {
519 outb(EE_CS, ee_addr);
520 outb(EE_CS | EE_SHIFT_CLK, ee_addr);
521 retval = (retval << 1) | ((inb(ee_daddr) & EE_DATA_READ) ? 1 : 0);
522 }
524 /* Terminate the EEPROM access. */
525 outb(EE_CS, ee_addr);
526 outb(EE_SHIFT_CLK, ee_addr);
527 outb(0, ee_addr);
528 return retval;
529 }
533 static int net_open(struct net_device *dev)
534 {
535 struct net_local *lp = netdev_priv(dev);
536 int ioaddr = dev->base_addr;
538 /* Set the configuration register 0 to 32K 100ns. byte-wide memory, 16 bit
539 bus access, and two 4K Tx queues. */
540 outb(0x5a, ioaddr + CONFIG_0);
542 /* Powerup, switch to register bank 2, and enable the Rx and Tx. */
543 outb(0xe8, ioaddr + CONFIG_1);
545 lp->tx_started = 0;
546 lp->tx_queue_ready = 1;
547 lp->rx_started = 0;
548 lp->tx_queue = 0;
549 lp->tx_queue_len = 0;
551 /* Turn on hardware Tx and Rx interrupts. */
552 outb(0x82, ioaddr + TX_INTR);
553 outb(0x81, ioaddr + RX_INTR);
555 /* Enable the IRQ on boards of fmv18x it is feasible. */
556 if (lp->jumpered) {
557 outb(0x80, ioaddr + IOCONFIG1);
558 }
560 netif_start_queue(dev);
561 return 0;
562 }
564 static void net_tx_timeout (struct net_device *dev)
565 {
566 struct net_local *lp = netdev_priv(dev);
567 int ioaddr = dev->base_addr;
569 printk ("%s: transmit timed out with status %04x, %s?\n", dev->name,
570 inw (ioaddr + STATUS), inb (ioaddr + TX_STATUS) & 0x80
571 ? "IRQ conflict" : "network cable problem");
572 printk ("%s: timeout registers: %04x %04x %04x %04x %04x %04x %04x %04x.\n",
573 dev->name, inw(ioaddr + TX_STATUS), inw(ioaddr + TX_INTR), inw(ioaddr + TX_MODE),
574 inw(ioaddr + CONFIG_0), inw(ioaddr + DATAPORT), inw(ioaddr + TX_START),
575 inw(ioaddr + MODE13 - 1), inw(ioaddr + RX_CTRL));
576 lp->stats.tx_errors++;
577 /* ToDo: We should try to restart the adaptor... */
578 outw(0xffff, ioaddr + MODE24);
579 outw (0xffff, ioaddr + TX_STATUS);
580 outb (0x5a, ioaddr + CONFIG_0);
581 outb (0xe8, ioaddr + CONFIG_1);
582 outw (0x8182, ioaddr + TX_INTR);
583 outb (0x00, ioaddr + TX_START);
584 outb (0x03, ioaddr + COL16CNTL);
586 dev->trans_start = jiffies;
588 lp->tx_started = 0;
589 lp->tx_queue_ready = 1;
590 lp->rx_started = 0;
591 lp->tx_queue = 0;
592 lp->tx_queue_len = 0;
594 netif_wake_queue(dev);
595 }
598 static int net_send_packet (struct sk_buff *skb, struct net_device *dev)
599 {
600 struct net_local *lp = netdev_priv(dev);
601 int ioaddr = dev->base_addr;
602 short length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;
603 short len = skb->len;
604 unsigned char *buf = skb->data;
605 static u8 pad[ETH_ZLEN];
607 netif_stop_queue (dev);
609 /* We may not start transmitting unless we finish transferring
610 a packet into the Tx queue. During executing the following
611 codes we possibly catch a Tx interrupt. Thus we flag off
612 tx_queue_ready, so that we prevent the interrupt routine
613 (net_interrupt) to start transmitting. */
614 lp->tx_queue_ready = 0;
615 {
616 outw (length, ioaddr + DATAPORT);
617 /* Packet data */
618 outsw (ioaddr + DATAPORT, buf, len >> 1);
619 /* Check for dribble byte */
620 if (len & 1) {
621 outw(skb->data[skb->len-1], ioaddr + DATAPORT);
622 len++;
623 }
624 /* Check for packet padding */
625 if (length != skb->len)
626 outsw(ioaddr + DATAPORT, pad, (length - len + 1) >> 1);
628 lp->tx_queue++;
629 lp->tx_queue_len += length + 2;
630 }
631 lp->tx_queue_ready = 1;
633 if (lp->tx_started == 0) {
634 /* If the Tx is idle, always trigger a transmit. */
635 outb (0x80 | lp->tx_queue, ioaddr + TX_START);
636 lp->tx_queue = 0;
637 lp->tx_queue_len = 0;
638 dev->trans_start = jiffies;
639 lp->tx_started = 1;
640 netif_start_queue (dev);
641 } else if (lp->tx_queue_len < 4096 - 1502)
642 /* Yes, there is room for one more packet. */
643 netif_start_queue (dev);
644 dev_kfree_skb (skb);
646 return 0;
647 }
649 /* The typical workload of the driver:
650 Handle the network interface interrupts. */
651 static irqreturn_t
652 net_interrupt(int irq, void *dev_id, struct pt_regs *regs)
653 {
654 struct net_device *dev = dev_id;
655 struct net_local *lp;
656 int ioaddr, status;
657 int handled = 0;
659 if (dev == NULL) {
660 printk ("at1700_interrupt(): irq %d for unknown device.\n", irq);
661 return IRQ_NONE;
662 }
664 ioaddr = dev->base_addr;
665 lp = netdev_priv(dev);
667 spin_lock (&lp->lock);
669 status = inw(ioaddr + TX_STATUS);
670 outw(status, ioaddr + TX_STATUS);
672 if (net_debug > 4)
673 printk("%s: Interrupt with status %04x.\n", dev->name, status);
674 if (lp->rx_started == 0 &&
675 (status & 0xff00 || (inb(ioaddr + RX_MODE) & 0x40) == 0)) {
676 /* Got a packet(s).
677 We cannot execute net_rx more than once at the same time for
678 the same device. During executing net_rx, we possibly catch a
679 Tx interrupt. Thus we flag on rx_started, so that we prevent
680 the interrupt routine (net_interrupt) to dive into net_rx
681 again. */
682 handled = 1;
683 lp->rx_started = 1;
684 outb(0x00, ioaddr + RX_INTR); /* Disable RX intr. */
685 net_rx(dev);
686 outb(0x81, ioaddr + RX_INTR); /* Enable RX intr. */
687 lp->rx_started = 0;
688 }
689 if (status & 0x00ff) {
690 handled = 1;
691 if (status & 0x02) {
692 /* More than 16 collisions occurred */
693 if (net_debug > 4)
694 printk("%s: 16 Collision occur during Txing.\n", dev->name);
695 /* Cancel sending a packet. */
696 outb(0x03, ioaddr + COL16CNTL);
697 lp->stats.collisions++;
698 }
699 if (status & 0x82) {
700 lp->stats.tx_packets++;
701 /* The Tx queue has any packets and is not being
702 transferred a packet from the host, start
703 transmitting. */
704 if (lp->tx_queue && lp->tx_queue_ready) {
705 outb(0x80 | lp->tx_queue, ioaddr + TX_START);
706 lp->tx_queue = 0;
707 lp->tx_queue_len = 0;
708 dev->trans_start = jiffies;
709 netif_wake_queue (dev);
710 } else {
711 lp->tx_started = 0;
712 netif_wake_queue (dev);
713 }
714 }
715 }
717 spin_unlock (&lp->lock);
718 return IRQ_RETVAL(handled);
719 }
721 /* We have a good packet(s), get it/them out of the buffers. */
722 static void
723 net_rx(struct net_device *dev)
724 {
725 struct net_local *lp = netdev_priv(dev);
726 int ioaddr = dev->base_addr;
727 int boguscount = 5;
729 while ((inb(ioaddr + RX_MODE) & 0x40) == 0) {
730 ushort status = inw(ioaddr + DATAPORT);
731 ushort pkt_len = inw(ioaddr + DATAPORT);
733 if (net_debug > 4)
734 printk("%s: Rxing packet mode %02x status %04x.\n",
735 dev->name, inb(ioaddr + RX_MODE), status);
736 #ifndef final_version
737 if (status == 0) {
738 outb(0x05, ioaddr + RX_CTRL);
739 break;
740 }
741 #endif
743 if ((status & 0xF0) != 0x20) { /* There was an error. */
744 lp->stats.rx_errors++;
745 if (status & 0x08) lp->stats.rx_length_errors++;
746 if (status & 0x04) lp->stats.rx_frame_errors++;
747 if (status & 0x02) lp->stats.rx_crc_errors++;
748 if (status & 0x01) lp->stats.rx_over_errors++;
749 } else {
750 /* Malloc up new buffer. */
751 struct sk_buff *skb;
753 if (pkt_len > 1550) {
754 printk("%s: The AT1700 claimed a very large packet, size %d.\n",
755 dev->name, pkt_len);
756 /* Prime the FIFO and then flush the packet. */
757 inw(ioaddr + DATAPORT); inw(ioaddr + DATAPORT);
758 outb(0x05, ioaddr + RX_CTRL);
759 lp->stats.rx_errors++;
760 break;
761 }
762 skb = dev_alloc_skb(pkt_len+3);
763 if (skb == NULL) {
764 printk("%s: Memory squeeze, dropping packet (len %d).\n",
765 dev->name, pkt_len);
766 /* Prime the FIFO and then flush the packet. */
767 inw(ioaddr + DATAPORT); inw(ioaddr + DATAPORT);
768 outb(0x05, ioaddr + RX_CTRL);
769 lp->stats.rx_dropped++;
770 break;
771 }
772 skb->dev = dev;
773 skb_reserve(skb,2);
775 insw(ioaddr + DATAPORT, skb_put(skb,pkt_len), (pkt_len + 1) >> 1);
776 skb->protocol=eth_type_trans(skb, dev);
777 netif_rx(skb);
778 dev->last_rx = jiffies;
779 lp->stats.rx_packets++;
780 lp->stats.rx_bytes += pkt_len;
781 }
782 if (--boguscount <= 0)
783 break;
784 }
786 /* If any worth-while packets have been received, dev_rint()
787 has done a mark_bh(NET_BH) for us and will work on them
788 when we get to the bottom-half routine. */
789 {
790 int i;
791 for (i = 0; i < 20; i++) {
792 if ((inb(ioaddr + RX_MODE) & 0x40) == 0x40)
793 break;
794 inw(ioaddr + DATAPORT); /* dummy status read */
795 outb(0x05, ioaddr + RX_CTRL);
796 }
798 if (net_debug > 5)
799 printk("%s: Exint Rx packet with mode %02x after %d ticks.\n",
800 dev->name, inb(ioaddr + RX_MODE), i);
801 }
802 return;
803 }
805 /* The inverse routine to net_open(). */
806 static int net_close(struct net_device *dev)
807 {
808 struct net_local *lp = netdev_priv(dev);
809 int ioaddr = dev->base_addr;
811 netif_stop_queue(dev);
813 /* Set configuration register 0 to disable Tx and Rx. */
814 outb(0xda, ioaddr + CONFIG_0);
816 /* No statistic counters on the chip to update. */
818 /* Disable the IRQ on boards of fmv18x where it is feasible. */
819 if (lp->jumpered) {
820 outb(0x00, ioaddr + IOCONFIG1);
821 free_irq(dev->irq, dev);
822 }
824 /* Power-down the chip. Green, green, green! */
825 outb(0x00, ioaddr + CONFIG_1);
826 return 0;
827 }
829 /* Get the current statistics.
830 This may be called with the card open or closed.
831 There are no on-chip counters, so this function is trivial.
832 */
833 static struct net_device_stats *
834 net_get_stats(struct net_device *dev)
835 {
836 struct net_local *lp = netdev_priv(dev);
837 return &lp->stats;
838 }
840 /*
841 Set the multicast/promiscuous mode for this adaptor.
842 */
844 static void
845 set_rx_mode(struct net_device *dev)
846 {
847 int ioaddr = dev->base_addr;
848 struct net_local *lp = netdev_priv(dev);
849 unsigned char mc_filter[8]; /* Multicast hash filter */
850 unsigned long flags;
851 int i;
853 if (dev->flags & IFF_PROMISC) {
854 /* Unconditionally log net taps. */
855 printk("%s: Promiscuous mode enabled.\n", dev->name);
856 memset(mc_filter, 0xff, sizeof(mc_filter));
857 outb(3, ioaddr + RX_MODE); /* Enable promiscuous mode */
858 } else if (dev->mc_count > MC_FILTERBREAK
859 || (dev->flags & IFF_ALLMULTI)) {
860 /* Too many to filter perfectly -- accept all multicasts. */
861 memset(mc_filter, 0xff, sizeof(mc_filter));
862 outb(2, ioaddr + RX_MODE); /* Use normal mode. */
863 } else if (dev->mc_count == 0) {
864 memset(mc_filter, 0x00, sizeof(mc_filter));
865 outb(1, ioaddr + RX_MODE); /* Ignore almost all multicasts. */
866 } else {
867 struct dev_mc_list *mclist;
868 int i;
870 memset(mc_filter, 0, sizeof(mc_filter));
871 for (i = 0, mclist = dev->mc_list; mclist && i < dev->mc_count;
872 i++, mclist = mclist->next) {
873 unsigned int bit =
874 ether_crc_le(ETH_ALEN, mclist->dmi_addr) >> 26;
875 mc_filter[bit >> 3] |= (1 << bit);
876 }
877 outb(0x02, ioaddr + RX_MODE); /* Use normal mode. */
878 }
880 spin_lock_irqsave (&lp->lock, flags);
881 if (memcmp(mc_filter, lp->mc_filter, sizeof(mc_filter))) {
882 int saved_bank = inw(ioaddr + CONFIG_0);
883 /* Switch to bank 1 and set the multicast table. */
884 outw((saved_bank & ~0x0C00) | 0x0480, ioaddr + CONFIG_0);
885 for (i = 0; i < 8; i++)
886 outb(mc_filter[i], ioaddr + PORT_OFFSET(8 + i));
887 memcpy(lp->mc_filter, mc_filter, sizeof(mc_filter));
888 outw(saved_bank, ioaddr + CONFIG_0);
889 }
890 spin_unlock_irqrestore (&lp->lock, flags);
891 return;
892 }
894 #ifdef MODULE
895 static struct net_device *dev_at1700;
897 module_param(io, int, 0);
898 module_param(irq, int, 0);
899 module_param(net_debug, int, 0);
900 MODULE_PARM_DESC(io, "AT1700/FMV18X I/O base address");
901 MODULE_PARM_DESC(irq, "AT1700/FMV18X IRQ number");
902 MODULE_PARM_DESC(net_debug, "AT1700/FMV18X debug level (0-6)");
904 int __init init_module(void)
905 {
906 if (io == 0)
907 printk("at1700: You should not use auto-probing with insmod!\n");
908 dev_at1700 = at1700_probe(-1);
909 if (IS_ERR(dev_at1700))
910 return PTR_ERR(dev_at1700);
911 return 0;
912 }
914 void
915 cleanup_module(void)
916 {
917 unregister_netdev(dev_at1700);
918 cleanup_card(dev_at1700);
919 free_netdev(dev_at1700);
920 }
921 #endif /* MODULE */
922 MODULE_LICENSE("GPL");
925 /*
926 * Local variables:
927 * compile-command: "gcc -DMODULE -D__KERNEL__ -Wall -Wstrict-prototypes -O6 -c at1700.c"
928 * alt-compile-command: "gcc -DMODVERSIONS -DMODULE -D__KERNEL__ -Wall -Wstrict-prototypes -O6 -c at1700.c"
929 * tab-width: 4
930 * c-basic-offset: 4
931 * c-indent-level: 4
932 * End:
933 */