ia64/linux-2.6.18-xen.hg

view drivers/net/sun3_82586.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 * Intel i82586 Ethernet definitions
3 *
4 * This is an extension to the Linux operating system, and is covered by the
5 * same Gnu Public License that covers that work.
6 *
7 * copyrights (c) 1994 by Michael Hipp (hippm@informatik.uni-tuebingen.de)
8 *
9 * I have done a look in the following sources:
10 * crynwr-packet-driver by Russ Nelson
11 * Garret A. Wollman's i82586-driver for BSD
12 */
14 /*
15 * Cloned from ni52.h, copyright as above.
16 *
17 * Modified for Sun3 OBIO i82586 by Sam Creasey (sammy@sammy.net)
18 */
21 /* defines for the obio chip (not vme) */
22 #define IEOB_NORSET 0x80 /* don't reset the board */
23 #define IEOB_ONAIR 0x40 /* put us on the air */
24 #define IEOB_ATTEN 0x20 /* attention! */
25 #define IEOB_IENAB 0x10 /* interrupt enable */
26 #define IEOB_XXXXX 0x08 /* free bit */
27 #define IEOB_XCVRL2 0x04 /* level 2 transceiver? */
28 #define IEOB_BUSERR 0x02 /* bus error */
29 #define IEOB_INT 0x01 /* interrupt */
31 /* where the obio one lives */
32 #define IE_OBIO 0xc0000
33 #define IE_IRQ 3
35 /*
36 * where to find the System Configuration Pointer (SCP)
37 */
38 #define SCP_DEFAULT_ADDRESS 0xfffff4
41 /*
42 * System Configuration Pointer Struct
43 */
45 struct scp_struct
46 {
47 unsigned short zero_dum0; /* has to be zero */
48 unsigned char sysbus; /* 0=16Bit,1=8Bit */
49 unsigned char zero_dum1; /* has to be zero for 586 */
50 unsigned short zero_dum2;
51 unsigned short zero_dum3;
52 char *iscp; /* pointer to the iscp-block */
53 };
56 /*
57 * Intermediate System Configuration Pointer (ISCP)
58 */
59 struct iscp_struct
60 {
61 unsigned char busy; /* 586 clears after successful init */
62 unsigned char zero_dummy; /* has to be zero */
63 unsigned short scb_offset; /* pointeroffset to the scb_base */
64 char *scb_base; /* base-address of all 16-bit offsets */
65 };
67 /*
68 * System Control Block (SCB)
69 */
70 struct scb_struct
71 {
72 unsigned char rus;
73 unsigned char cus;
74 unsigned char cmd_ruc; /* command word: RU part */
75 unsigned char cmd_cuc; /* command word: CU part & ACK */
76 unsigned short cbl_offset; /* pointeroffset, command block list */
77 unsigned short rfa_offset; /* pointeroffset, receive frame area */
78 unsigned short crc_errs; /* CRC-Error counter */
79 unsigned short aln_errs; /* allignmenterror counter */
80 unsigned short rsc_errs; /* Resourceerror counter */
81 unsigned short ovrn_errs; /* OVerrunerror counter */
82 };
84 /*
85 * possible command values for the command word
86 */
87 #define RUC_MASK 0x0070 /* mask for RU commands */
88 #define RUC_NOP 0x0000 /* NOP-command */
89 #define RUC_START 0x0010 /* start RU */
90 #define RUC_RESUME 0x0020 /* resume RU after suspend */
91 #define RUC_SUSPEND 0x0030 /* suspend RU */
92 #define RUC_ABORT 0x0040 /* abort receiver operation immediately */
94 #define CUC_MASK 0x07 /* mask for CU command */
95 #define CUC_NOP 0x00 /* NOP-command */
96 #define CUC_START 0x01 /* start execution of 1. cmd on the CBL */
97 #define CUC_RESUME 0x02 /* resume after suspend */
98 #define CUC_SUSPEND 0x03 /* Suspend CU */
99 #define CUC_ABORT 0x04 /* abort command operation immediately */
101 #define ACK_MASK 0xf0 /* mask for ACK command */
102 #define ACK_CX 0x80 /* acknowledges STAT_CX */
103 #define ACK_FR 0x40 /* ack. STAT_FR */
104 #define ACK_CNA 0x20 /* ack. STAT_CNA */
105 #define ACK_RNR 0x10 /* ack. STAT_RNR */
107 /*
108 * possible status values for the status word
109 */
110 #define STAT_MASK 0xf0 /* mask for cause of interrupt */
111 #define STAT_CX 0x80 /* CU finished cmd with its I bit set */
112 #define STAT_FR 0x40 /* RU finished receiving a frame */
113 #define STAT_CNA 0x20 /* CU left active state */
114 #define STAT_RNR 0x10 /* RU left ready state */
116 #define CU_STATUS 0x7 /* CU status, 0=idle */
117 #define CU_SUSPEND 0x1 /* CU is suspended */
118 #define CU_ACTIVE 0x2 /* CU is active */
120 #define RU_STATUS 0x70 /* RU status, 0=idle */
121 #define RU_SUSPEND 0x10 /* RU suspended */
122 #define RU_NOSPACE 0x20 /* RU no resources */
123 #define RU_READY 0x40 /* RU is ready */
125 /*
126 * Receive Frame Descriptor (RFD)
127 */
128 struct rfd_struct
129 {
130 unsigned char stat_low; /* status word */
131 unsigned char stat_high; /* status word */
132 unsigned char rfd_sf; /* 82596 mode only */
133 unsigned char last; /* Bit15,Last Frame on List / Bit14,suspend */
134 unsigned short next; /* linkoffset to next RFD */
135 unsigned short rbd_offset; /* pointeroffset to RBD-buffer */
136 unsigned char dest[6]; /* ethernet-address, destination */
137 unsigned char source[6]; /* ethernet-address, source */
138 unsigned short length; /* 802.3 frame-length */
139 unsigned short zero_dummy; /* dummy */
140 };
142 #define RFD_LAST 0x80 /* last: last rfd in the list */
143 #define RFD_SUSP 0x40 /* last: suspend RU after */
144 #define RFD_COMPL 0x80
145 #define RFD_OK 0x20
146 #define RFD_BUSY 0x40
147 #define RFD_ERR_LEN 0x10 /* Length error (if enabled length-checking */
148 #define RFD_ERR_CRC 0x08 /* CRC error */
149 #define RFD_ERR_ALGN 0x04 /* Alignment error */
150 #define RFD_ERR_RNR 0x02 /* status: receiver out of resources */
151 #define RFD_ERR_OVR 0x01 /* DMA Overrun! */
153 #define RFD_ERR_FTS 0x0080 /* Frame to short */
154 #define RFD_ERR_NEOP 0x0040 /* No EOP flag (for bitstuffing only) */
155 #define RFD_ERR_TRUN 0x0020 /* (82596 only/SF mode) indicates truncated frame */
156 #define RFD_MATCHADD 0x0002 /* status: Destinationaddress !matches IA (only 82596) */
157 #define RFD_COLLDET 0x0001 /* Detected collision during reception */
159 /*
160 * Receive Buffer Descriptor (RBD)
161 */
162 struct rbd_struct
163 {
164 unsigned short status; /* status word,number of used bytes in buff */
165 unsigned short next; /* pointeroffset to next RBD */
166 char *buffer; /* receive buffer address pointer */
167 unsigned short size; /* size of this buffer */
168 unsigned short zero_dummy; /* dummy */
169 };
171 #define RBD_LAST 0x8000 /* last buffer */
172 #define RBD_USED 0x4000 /* this buffer has data */
173 #define RBD_MASK 0x3fff /* size-mask for length */
175 /*
176 * Statusvalues for Commands/RFD
177 */
178 #define STAT_COMPL 0x8000 /* status: frame/command is complete */
179 #define STAT_BUSY 0x4000 /* status: frame/command is busy */
180 #define STAT_OK 0x2000 /* status: frame/command is ok */
182 /*
183 * Action-Commands
184 */
185 #define CMD_NOP 0x0000 /* NOP */
186 #define CMD_IASETUP 0x0001 /* initial address setup command */
187 #define CMD_CONFIGURE 0x0002 /* configure command */
188 #define CMD_MCSETUP 0x0003 /* MC setup command */
189 #define CMD_XMIT 0x0004 /* transmit command */
190 #define CMD_TDR 0x0005 /* time domain reflectometer (TDR) command */
191 #define CMD_DUMP 0x0006 /* dump command */
192 #define CMD_DIAGNOSE 0x0007 /* diagnose command */
194 /*
195 * Action command bits
196 */
197 #define CMD_LAST 0x8000 /* indicates last command in the CBL */
198 #define CMD_SUSPEND 0x4000 /* suspend CU after this CB */
199 #define CMD_INT 0x2000 /* generate interrupt after execution */
201 /*
202 * NOP - command
203 */
204 struct nop_cmd_struct
205 {
206 unsigned short cmd_status; /* status of this command */
207 unsigned short cmd_cmd; /* the command itself (+bits) */
208 unsigned short cmd_link; /* offsetpointer to next command */
209 };
211 /*
212 * IA Setup command
213 */
214 struct iasetup_cmd_struct
215 {
216 unsigned short cmd_status;
217 unsigned short cmd_cmd;
218 unsigned short cmd_link;
219 unsigned char iaddr[6];
220 };
222 /*
223 * Configure command
224 */
225 struct configure_cmd_struct
226 {
227 unsigned short cmd_status;
228 unsigned short cmd_cmd;
229 unsigned short cmd_link;
230 unsigned char byte_cnt; /* size of the config-cmd */
231 unsigned char fifo; /* fifo/recv monitor */
232 unsigned char sav_bf; /* save bad frames (bit7=1)*/
233 unsigned char adr_len; /* adr_len(0-2),al_loc(3),pream(4-5),loopbak(6-7)*/
234 unsigned char priority; /* lin_prio(0-2),exp_prio(4-6),bof_metd(7) */
235 unsigned char ifs; /* inter frame spacing */
236 unsigned char time_low; /* slot time low */
237 unsigned char time_high; /* slot time high(0-2) and max. retries(4-7) */
238 unsigned char promisc; /* promisc-mode(0) , et al (1-7) */
239 unsigned char carr_coll; /* carrier(0-3)/collision(4-7) stuff */
240 unsigned char fram_len; /* minimal frame len */
241 unsigned char dummy; /* dummy */
242 };
244 /*
245 * Multicast Setup command
246 */
247 struct mcsetup_cmd_struct
248 {
249 unsigned short cmd_status;
250 unsigned short cmd_cmd;
251 unsigned short cmd_link;
252 unsigned short mc_cnt; /* number of bytes in the MC-List */
253 unsigned char mc_list[0][6]; /* pointer to 6 bytes entries */
254 };
256 /*
257 * DUMP command
258 */
259 struct dump_cmd_struct
260 {
261 unsigned short cmd_status;
262 unsigned short cmd_cmd;
263 unsigned short cmd_link;
264 unsigned short dump_offset; /* pointeroffset to DUMP space */
265 };
267 /*
268 * transmit command
269 */
270 struct transmit_cmd_struct
271 {
272 unsigned short cmd_status;
273 unsigned short cmd_cmd;
274 unsigned short cmd_link;
275 unsigned short tbd_offset; /* pointeroffset to TBD */
276 unsigned char dest[6]; /* destination address of the frame */
277 unsigned short length; /* user defined: 802.3 length / Ether type */
278 };
280 #define TCMD_ERRMASK 0x0fa0
281 #define TCMD_MAXCOLLMASK 0x000f
282 #define TCMD_MAXCOLL 0x0020
283 #define TCMD_HEARTBEAT 0x0040
284 #define TCMD_DEFERRED 0x0080
285 #define TCMD_UNDERRUN 0x0100
286 #define TCMD_LOSTCTS 0x0200
287 #define TCMD_NOCARRIER 0x0400
288 #define TCMD_LATECOLL 0x0800
290 struct tdr_cmd_struct
291 {
292 unsigned short cmd_status;
293 unsigned short cmd_cmd;
294 unsigned short cmd_link;
295 unsigned short status;
296 };
298 #define TDR_LNK_OK 0x8000 /* No link problem identified */
299 #define TDR_XCVR_PRB 0x4000 /* indicates a transceiver problem */
300 #define TDR_ET_OPN 0x2000 /* open, no correct termination */
301 #define TDR_ET_SRT 0x1000 /* TDR detected a short circuit */
302 #define TDR_TIMEMASK 0x07ff /* mask for the time field */
304 /*
305 * Transmit Buffer Descriptor (TBD)
306 */
307 struct tbd_struct
308 {
309 unsigned short size; /* size + EOF-Flag(15) */
310 unsigned short next; /* pointeroffset to next TBD */
311 char *buffer; /* pointer to buffer */
312 };
314 #define TBD_LAST 0x8000 /* EOF-Flag, indicates last buffer in list */