ia64/linux-2.6.18-xen.hg

view drivers/net/sonic.h @ 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 /*
2 * Header file for sonic.c
3 *
4 * (C) Waldorf Electronics, Germany
5 * Written by Andreas Busse
6 *
7 * NOTE: most of the structure definitions here are endian dependent.
8 * If you want to use this driver on big endian machines, the data
9 * and pad structure members must be exchanged. Also, the structures
10 * need to be changed accordingly to the bus size.
11 *
12 * 981229 MSch: did just that for the 68k Mac port (32 bit, big endian)
13 *
14 * 990611 David Huggins-Daines <dhd@debian.org>: This machine abstraction
15 * does not cope with 16-bit bus sizes very well. Therefore I have
16 * rewritten it with ugly macros and evil inlines.
17 *
18 * 050625 Finn Thain: introduced more 32-bit cards and dhd's support
19 * for 16-bit cards (from the mac68k project).
20 */
22 #ifndef SONIC_H
23 #define SONIC_H
26 /*
27 * SONIC register offsets
28 */
30 #define SONIC_CMD 0x00
31 #define SONIC_DCR 0x01
32 #define SONIC_RCR 0x02
33 #define SONIC_TCR 0x03
34 #define SONIC_IMR 0x04
35 #define SONIC_ISR 0x05
37 #define SONIC_UTDA 0x06
38 #define SONIC_CTDA 0x07
40 #define SONIC_URDA 0x0d
41 #define SONIC_CRDA 0x0e
42 #define SONIC_EOBC 0x13
43 #define SONIC_URRA 0x14
44 #define SONIC_RSA 0x15
45 #define SONIC_REA 0x16
46 #define SONIC_RRP 0x17
47 #define SONIC_RWP 0x18
48 #define SONIC_RSC 0x2b
50 #define SONIC_CEP 0x21
51 #define SONIC_CAP2 0x22
52 #define SONIC_CAP1 0x23
53 #define SONIC_CAP0 0x24
54 #define SONIC_CE 0x25
55 #define SONIC_CDP 0x26
56 #define SONIC_CDC 0x27
58 #define SONIC_WT0 0x29
59 #define SONIC_WT1 0x2a
61 #define SONIC_SR 0x28
64 /* test-only registers */
66 #define SONIC_TPS 0x08
67 #define SONIC_TFC 0x09
68 #define SONIC_TSA0 0x0a
69 #define SONIC_TSA1 0x0b
70 #define SONIC_TFS 0x0c
72 #define SONIC_CRBA0 0x0f
73 #define SONIC_CRBA1 0x10
74 #define SONIC_RBWC0 0x11
75 #define SONIC_RBWC1 0x12
76 #define SONIC_TTDA 0x20
77 #define SONIC_MDT 0x2f
79 #define SONIC_TRBA0 0x19
80 #define SONIC_TRBA1 0x1a
81 #define SONIC_TBWC0 0x1b
82 #define SONIC_TBWC1 0x1c
83 #define SONIC_LLFA 0x1f
85 #define SONIC_ADDR0 0x1d
86 #define SONIC_ADDR1 0x1e
88 /*
89 * Error counters
90 */
92 #define SONIC_CRCT 0x2c
93 #define SONIC_FAET 0x2d
94 #define SONIC_MPT 0x2e
96 #define SONIC_DCR2 0x3f
98 /*
99 * SONIC command bits
100 */
102 #define SONIC_CR_LCAM 0x0200
103 #define SONIC_CR_RRRA 0x0100
104 #define SONIC_CR_RST 0x0080
105 #define SONIC_CR_ST 0x0020
106 #define SONIC_CR_STP 0x0010
107 #define SONIC_CR_RXEN 0x0008
108 #define SONIC_CR_RXDIS 0x0004
109 #define SONIC_CR_TXP 0x0002
110 #define SONIC_CR_HTX 0x0001
112 /*
113 * SONIC data configuration bits
114 */
116 #define SONIC_DCR_EXBUS 0x8000
117 #define SONIC_DCR_LBR 0x2000
118 #define SONIC_DCR_PO1 0x1000
119 #define SONIC_DCR_PO0 0x0800
120 #define SONIC_DCR_SBUS 0x0400
121 #define SONIC_DCR_USR1 0x0200
122 #define SONIC_DCR_USR0 0x0100
123 #define SONIC_DCR_WC1 0x0080
124 #define SONIC_DCR_WC0 0x0040
125 #define SONIC_DCR_DW 0x0020
126 #define SONIC_DCR_BMS 0x0010
127 #define SONIC_DCR_RFT1 0x0008
128 #define SONIC_DCR_RFT0 0x0004
129 #define SONIC_DCR_TFT1 0x0002
130 #define SONIC_DCR_TFT0 0x0001
132 /*
133 * Constants for the SONIC receive control register.
134 */
136 #define SONIC_RCR_ERR 0x8000
137 #define SONIC_RCR_RNT 0x4000
138 #define SONIC_RCR_BRD 0x2000
139 #define SONIC_RCR_PRO 0x1000
140 #define SONIC_RCR_AMC 0x0800
141 #define SONIC_RCR_LB1 0x0400
142 #define SONIC_RCR_LB0 0x0200
144 #define SONIC_RCR_MC 0x0100
145 #define SONIC_RCR_BC 0x0080
146 #define SONIC_RCR_LPKT 0x0040
147 #define SONIC_RCR_CRS 0x0020
148 #define SONIC_RCR_COL 0x0010
149 #define SONIC_RCR_CRCR 0x0008
150 #define SONIC_RCR_FAER 0x0004
151 #define SONIC_RCR_LBK 0x0002
152 #define SONIC_RCR_PRX 0x0001
154 #define SONIC_RCR_LB_OFF 0
155 #define SONIC_RCR_LB_MAC SONIC_RCR_LB0
156 #define SONIC_RCR_LB_ENDEC SONIC_RCR_LB1
157 #define SONIC_RCR_LB_TRANS (SONIC_RCR_LB0 | SONIC_RCR_LB1)
159 /* default RCR setup */
161 #define SONIC_RCR_DEFAULT (SONIC_RCR_BRD)
164 /*
165 * SONIC Transmit Control register bits
166 */
168 #define SONIC_TCR_PINTR 0x8000
169 #define SONIC_TCR_POWC 0x4000
170 #define SONIC_TCR_CRCI 0x2000
171 #define SONIC_TCR_EXDIS 0x1000
172 #define SONIC_TCR_EXD 0x0400
173 #define SONIC_TCR_DEF 0x0200
174 #define SONIC_TCR_NCRS 0x0100
175 #define SONIC_TCR_CRLS 0x0080
176 #define SONIC_TCR_EXC 0x0040
177 #define SONIC_TCR_PMB 0x0008
178 #define SONIC_TCR_FU 0x0004
179 #define SONIC_TCR_BCM 0x0002
180 #define SONIC_TCR_PTX 0x0001
182 #define SONIC_TCR_DEFAULT 0x0000
184 /*
185 * Constants for the SONIC_INTERRUPT_MASK and
186 * SONIC_INTERRUPT_STATUS registers.
187 */
189 #define SONIC_INT_BR 0x4000
190 #define SONIC_INT_HBL 0x2000
191 #define SONIC_INT_LCD 0x1000
192 #define SONIC_INT_PINT 0x0800
193 #define SONIC_INT_PKTRX 0x0400
194 #define SONIC_INT_TXDN 0x0200
195 #define SONIC_INT_TXER 0x0100
196 #define SONIC_INT_TC 0x0080
197 #define SONIC_INT_RDE 0x0040
198 #define SONIC_INT_RBE 0x0020
199 #define SONIC_INT_RBAE 0x0010
200 #define SONIC_INT_CRC 0x0008
201 #define SONIC_INT_FAE 0x0004
202 #define SONIC_INT_MP 0x0002
203 #define SONIC_INT_RFO 0x0001
206 /*
207 * The interrupts we allow.
208 */
210 #define SONIC_IMR_DEFAULT ( SONIC_INT_BR | \
211 SONIC_INT_LCD | \
212 SONIC_INT_RFO | \
213 SONIC_INT_PKTRX | \
214 SONIC_INT_TXDN | \
215 SONIC_INT_TXER | \
216 SONIC_INT_RDE | \
217 SONIC_INT_RBAE | \
218 SONIC_INT_CRC | \
219 SONIC_INT_FAE | \
220 SONIC_INT_MP)
223 #define SONIC_EOL 0x0001
224 #define CAM_DESCRIPTORS 16
226 /* Offsets in the various DMA buffers accessed by the SONIC */
228 #define SONIC_BITMODE16 0
229 #define SONIC_BITMODE32 1
230 #define SONIC_BUS_SCALE(bitmode) ((bitmode) ? 4 : 2)
231 /* Note! These are all measured in bus-size units, so use SONIC_BUS_SCALE */
232 #define SIZEOF_SONIC_RR 4
233 #define SONIC_RR_BUFADR_L 0
234 #define SONIC_RR_BUFADR_H 1
235 #define SONIC_RR_BUFSIZE_L 2
236 #define SONIC_RR_BUFSIZE_H 3
238 #define SIZEOF_SONIC_RD 7
239 #define SONIC_RD_STATUS 0
240 #define SONIC_RD_PKTLEN 1
241 #define SONIC_RD_PKTPTR_L 2
242 #define SONIC_RD_PKTPTR_H 3
243 #define SONIC_RD_SEQNO 4
244 #define SONIC_RD_LINK 5
245 #define SONIC_RD_IN_USE 6
247 #define SIZEOF_SONIC_TD 8
248 #define SONIC_TD_STATUS 0
249 #define SONIC_TD_CONFIG 1
250 #define SONIC_TD_PKTSIZE 2
251 #define SONIC_TD_FRAG_COUNT 3
252 #define SONIC_TD_FRAG_PTR_L 4
253 #define SONIC_TD_FRAG_PTR_H 5
254 #define SONIC_TD_FRAG_SIZE 6
255 #define SONIC_TD_LINK 7
257 #define SIZEOF_SONIC_CD 4
258 #define SONIC_CD_ENTRY_POINTER 0
259 #define SONIC_CD_CAP0 1
260 #define SONIC_CD_CAP1 2
261 #define SONIC_CD_CAP2 3
263 #define SIZEOF_SONIC_CDA ((CAM_DESCRIPTORS * SIZEOF_SONIC_CD) + 1)
264 #define SONIC_CDA_CAM_ENABLE (CAM_DESCRIPTORS * SIZEOF_SONIC_CD)
266 /*
267 * Some tunables for the buffer areas. Power of 2 is required
268 * the current driver uses one receive buffer for each descriptor.
269 *
270 * MSch: use more buffer space for the slow m68k Macs!
271 */
272 #define SONIC_NUM_RRS 16 /* number of receive resources */
273 #define SONIC_NUM_RDS SONIC_NUM_RRS /* number of receive descriptors */
274 #define SONIC_NUM_TDS 16 /* number of transmit descriptors */
276 #define SONIC_RDS_MASK (SONIC_NUM_RDS-1)
277 #define SONIC_TDS_MASK (SONIC_NUM_TDS-1)
279 #define SONIC_RBSIZE 1520 /* size of one resource buffer */
281 /* Again, measured in bus size units! */
282 #define SIZEOF_SONIC_DESC (SIZEOF_SONIC_CDA \
283 + (SIZEOF_SONIC_TD * SONIC_NUM_TDS) \
284 + (SIZEOF_SONIC_RD * SONIC_NUM_RDS) \
285 + (SIZEOF_SONIC_RR * SONIC_NUM_RRS))
287 /* Information that need to be kept for each board. */
288 struct sonic_local {
289 /* Bus size. 0 == 16 bits, 1 == 32 bits. */
290 int dma_bitmode;
291 /* Register offset within the longword (independent of endianness,
292 and varies from one type of Macintosh SONIC to another
293 (Aarrgh)) */
294 int reg_offset;
295 void *descriptors;
296 /* Crud. These areas have to be within the same 64K. Therefore
297 we allocate a desriptors page, and point these to places within it. */
298 void *cda; /* CAM descriptor area */
299 void *tda; /* Transmit descriptor area */
300 void *rra; /* Receive resource area */
301 void *rda; /* Receive descriptor area */
302 struct sk_buff* volatile rx_skb[SONIC_NUM_RRS]; /* packets to be received */
303 struct sk_buff* volatile tx_skb[SONIC_NUM_TDS]; /* packets to be transmitted */
304 unsigned int tx_len[SONIC_NUM_TDS]; /* lengths of tx DMA mappings */
305 /* Logical DMA addresses on MIPS, bus addresses on m68k
306 * (so "laddr" is a bit misleading) */
307 dma_addr_t descriptors_laddr;
308 u32 cda_laddr; /* logical DMA address of CDA */
309 u32 tda_laddr; /* logical DMA address of TDA */
310 u32 rra_laddr; /* logical DMA address of RRA */
311 u32 rda_laddr; /* logical DMA address of RDA */
312 dma_addr_t rx_laddr[SONIC_NUM_RRS]; /* logical DMA addresses of rx skbuffs */
313 dma_addr_t tx_laddr[SONIC_NUM_TDS]; /* logical DMA addresses of tx skbuffs */
314 unsigned int rra_end;
315 unsigned int cur_rwp;
316 unsigned int cur_rx;
317 unsigned int cur_tx; /* first unacked transmit packet */
318 unsigned int eol_rx;
319 unsigned int eol_tx; /* last unacked transmit packet */
320 unsigned int next_tx; /* next free TD */
321 struct device *device; /* generic device */
322 struct net_device_stats stats;
323 };
325 #define TX_TIMEOUT (3 * HZ)
327 /* Index to functions, as function prototypes. */
329 static int sonic_open(struct net_device *dev);
330 static int sonic_send_packet(struct sk_buff *skb, struct net_device *dev);
331 static irqreturn_t sonic_interrupt(int irq, void *dev_id, struct pt_regs *regs);
332 static void sonic_rx(struct net_device *dev);
333 static int sonic_close(struct net_device *dev);
334 static struct net_device_stats *sonic_get_stats(struct net_device *dev);
335 static void sonic_multicast_list(struct net_device *dev);
336 static int sonic_init(struct net_device *dev);
337 static void sonic_tx_timeout(struct net_device *dev);
339 /* Internal inlines for reading/writing DMA buffers. Note that bus
340 size and endianness matter here, whereas they don't for registers,
341 as far as we can tell. */
342 /* OpenBSD calls this "SWO". I'd like to think that sonic_buf_put()
343 is a much better name. */
344 static inline void sonic_buf_put(void* base, int bitmode,
345 int offset, __u16 val)
346 {
347 if (bitmode)
348 #ifdef __BIG_ENDIAN
349 ((__u16 *) base + (offset*2))[1] = val;
350 #else
351 ((__u16 *) base + (offset*2))[0] = val;
352 #endif
353 else
354 ((__u16 *) base)[offset] = val;
355 }
357 static inline __u16 sonic_buf_get(void* base, int bitmode,
358 int offset)
359 {
360 if (bitmode)
361 #ifdef __BIG_ENDIAN
362 return ((volatile __u16 *) base + (offset*2))[1];
363 #else
364 return ((volatile __u16 *) base + (offset*2))[0];
365 #endif
366 else
367 return ((volatile __u16 *) base)[offset];
368 }
370 /* Inlines that you should actually use for reading/writing DMA buffers */
371 static inline void sonic_cda_put(struct net_device* dev, int entry,
372 int offset, __u16 val)
373 {
374 struct sonic_local* lp = (struct sonic_local *) dev->priv;
375 sonic_buf_put(lp->cda, lp->dma_bitmode,
376 (entry * SIZEOF_SONIC_CD) + offset, val);
377 }
379 static inline __u16 sonic_cda_get(struct net_device* dev, int entry,
380 int offset)
381 {
382 struct sonic_local* lp = (struct sonic_local *) dev->priv;
383 return sonic_buf_get(lp->cda, lp->dma_bitmode,
384 (entry * SIZEOF_SONIC_CD) + offset);
385 }
387 static inline void sonic_set_cam_enable(struct net_device* dev, __u16 val)
388 {
389 struct sonic_local* lp = (struct sonic_local *) dev->priv;
390 sonic_buf_put(lp->cda, lp->dma_bitmode, SONIC_CDA_CAM_ENABLE, val);
391 }
393 static inline __u16 sonic_get_cam_enable(struct net_device* dev)
394 {
395 struct sonic_local* lp = (struct sonic_local *) dev->priv;
396 return sonic_buf_get(lp->cda, lp->dma_bitmode, SONIC_CDA_CAM_ENABLE);
397 }
399 static inline void sonic_tda_put(struct net_device* dev, int entry,
400 int offset, __u16 val)
401 {
402 struct sonic_local* lp = (struct sonic_local *) dev->priv;
403 sonic_buf_put(lp->tda, lp->dma_bitmode,
404 (entry * SIZEOF_SONIC_TD) + offset, val);
405 }
407 static inline __u16 sonic_tda_get(struct net_device* dev, int entry,
408 int offset)
409 {
410 struct sonic_local* lp = (struct sonic_local *) dev->priv;
411 return sonic_buf_get(lp->tda, lp->dma_bitmode,
412 (entry * SIZEOF_SONIC_TD) + offset);
413 }
415 static inline void sonic_rda_put(struct net_device* dev, int entry,
416 int offset, __u16 val)
417 {
418 struct sonic_local* lp = (struct sonic_local *) dev->priv;
419 sonic_buf_put(lp->rda, lp->dma_bitmode,
420 (entry * SIZEOF_SONIC_RD) + offset, val);
421 }
423 static inline __u16 sonic_rda_get(struct net_device* dev, int entry,
424 int offset)
425 {
426 struct sonic_local* lp = (struct sonic_local *) dev->priv;
427 return sonic_buf_get(lp->rda, lp->dma_bitmode,
428 (entry * SIZEOF_SONIC_RD) + offset);
429 }
431 static inline void sonic_rra_put(struct net_device* dev, int entry,
432 int offset, __u16 val)
433 {
434 struct sonic_local* lp = (struct sonic_local *) dev->priv;
435 sonic_buf_put(lp->rra, lp->dma_bitmode,
436 (entry * SIZEOF_SONIC_RR) + offset, val);
437 }
439 static inline __u16 sonic_rra_get(struct net_device* dev, int entry,
440 int offset)
441 {
442 struct sonic_local* lp = (struct sonic_local *) dev->priv;
443 return sonic_buf_get(lp->rra, lp->dma_bitmode,
444 (entry * SIZEOF_SONIC_RR) + offset);
445 }
447 static const char *version =
448 "sonic.c:v0.92 20.9.98 tsbogend@alpha.franken.de\n";
450 #endif /* SONIC_H */