Mercurial > illumos > illumos-gate
annotate usr/src/uts/sun4v/sys/vdc.h @ 10812:c6175c150216
6726533 vdisk failover should handle storage/storage-path failures (a la mpxio)
author | Alexandre Chartre <Alexandre.Chartre@Sun.COM> |
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date | Mon, 19 Oct 2009 13:40:30 -0700 |
parents | 68d0fe4c716e |
children | 2663784ac9bb |
rev | line source |
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1991 | 1 /* |
2 * CDDL HEADER START | |
3 * | |
4 * The contents of this file are subject to the terms of the | |
5 * Common Development and Distribution License (the "License"). | |
6 * You may not use this file except in compliance with the License. | |
7 * | |
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE | |
9 * or http://www.opensolaris.org/os/licensing. | |
10 * See the License for the specific language governing permissions | |
11 * and limitations under the License. | |
12 * | |
13 * When distributing Covered Code, include this CDDL HEADER in each | |
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. | |
15 * If applicable, add the following below this CDDL HEADER, with the | |
16 * fields enclosed by brackets "[]" replaced with your own identifying | |
17 * information: Portions Copyright [yyyy] [name of copyright owner] | |
18 * | |
19 * CDDL HEADER END | |
20 */ | |
21 | |
22 /* | |
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23 * Copyright 2009 Sun Microsystems, Inc. All rights reserved. |
1991 | 24 * Use is subject to license terms. |
25 */ | |
26 | |
27 #ifndef _VDC_H | |
28 #define _VDC_H | |
29 | |
30 /* | |
31 * Virtual disk client implementation definitions | |
32 */ | |
33 | |
34 #include <sys/sysmacros.h> | |
35 #include <sys/note.h> | |
36 | |
37 #include <sys/ldc.h> | |
38 #include <sys/vio_mailbox.h> | |
39 #include <sys/vdsk_mailbox.h> | |
40 #include <sys/vdsk_common.h> | |
41 | |
42 #ifdef __cplusplus | |
43 extern "C" { | |
44 #endif | |
45 | |
46 #define VDC_DRIVER_NAME "vdc" | |
47 | |
48 /* | |
49 * Bit-field values to indicate if parts of the vdc driver are initialised. | |
50 */ | |
51 #define VDC_SOFT_STATE 0x0001 | |
52 #define VDC_LOCKS 0x0002 | |
53 #define VDC_MINOR 0x0004 | |
54 #define VDC_THREAD 0x0008 | |
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55 #define VDC_DRING_INIT 0x0010 /* The DRing was created */ |
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56 #define VDC_DRING_BOUND 0x0020 /* The DRing was bound to an LDC channel */ |
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57 #define VDC_DRING_LOCAL 0x0040 /* The local private DRing was allocated */ |
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58 #define VDC_DRING_ENTRY 0x0080 /* At least one DRing entry was initialised */ |
1991 | 59 #define VDC_DRING (VDC_DRING_INIT | VDC_DRING_BOUND | \ |
60 VDC_DRING_LOCAL | VDC_DRING_ENTRY) | |
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61 #define VDC_HANDSHAKE 0x0100 /* Indicates if a handshake is in progress */ |
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62 #define VDC_HANDSHAKE_STOP 0x0200 /* stop further handshakes */ |
1991 | 63 |
64 /* | |
65 * Definitions of MD nodes/properties. | |
66 */ | |
67 #define VDC_MD_CHAN_NAME "channel-endpoint" | |
68 #define VDC_MD_VDEV_NAME "virtual-device" | |
4848 | 69 #define VDC_MD_PORT_NAME "virtual-device-port" |
1991 | 70 #define VDC_MD_DISK_NAME "disk" |
71 #define VDC_MD_CFG_HDL "cfg-handle" | |
4848 | 72 #define VDC_MD_TIMEOUT "vdc-timeout" |
73 #define VDC_MD_ID "id" | |
1991 | 74 |
75 /* | |
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76 * Definition of actions to be carried out when processing the sequence ID |
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77 * of a message received from the vDisk server. The function verifying the |
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78 * sequence number checks the 'seq_num_xxx' fields in the soft state and |
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79 * returns whether the message should be processed (VDC_SEQ_NUM_TODO) or |
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80 * whether it was it was previously processed (VDC_SEQ_NUM_SKIP). |
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81 */ |
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82 #define VDC_SEQ_NUM_INVALID -1 /* Error */ |
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83 #define VDC_SEQ_NUM_SKIP 0 /* Request already processed */ |
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84 #define VDC_SEQ_NUM_TODO 1 /* Request needs processing */ |
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85 |
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86 /* |
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87 * Flags for virtual disk operations. |
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88 */ |
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89 #define VDC_OP_STATE_RUNNING 0x01 /* do operation in running state */ |
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90 #define VDC_OP_ERRCHK_BACKEND 0x02 /* check backend on error */ |
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91 #define VDC_OP_ERRCHK_CONFLICT 0x04 /* check resv conflict on error */ |
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92 |
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93 #define VDC_OP_ERRCHK (VDC_OP_ERRCHK_BACKEND | VDC_OP_ERRCHK_CONFLICT) |
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94 #define VDC_OP_NORMAL (VDC_OP_STATE_RUNNING | VDC_OP_ERRCHK) |
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95 |
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96 /* |
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97 * Macros to get UNIT and PART number |
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98 */ |
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99 #define VDCUNIT_SHIFT 3 |
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100 #define VDCPART_MASK 7 |
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101 |
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102 #define VDCUNIT(dev) (getminor((dev)) >> VDCUNIT_SHIFT) |
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103 #define VDCPART(dev) (getminor((dev)) & VDCPART_MASK) |
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104 |
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105 /* |
1991 | 106 * Scheme to store the instance number and the slice number in the minor number. |
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107 * (NOTE: Uses the same format and definitions as the sd(7D) driver) |
1991 | 108 */ |
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109 #define VD_MAKE_DEV(instance, minor) ((instance << VDCUNIT_SHIFT) | minor) |
1991 | 110 |
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111 #define VDC_EFI_DEV_SET(dev, vdsk, ioctl) \ |
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112 VDSK_EFI_DEV_SET(dev, vdsk, ioctl, \ |
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113 (vdsk)->vdisk_bsize, (vdsk)->vdisk_size) |
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114 |
1991 | 115 /* |
116 * variables controlling how long to wait before timing out and how many | |
117 * retries to attempt before giving up when communicating with vds. | |
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118 * |
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119 * These values need to be sufficiently large so that a guest can survive |
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120 * the reboot of the service domain. |
1991 | 121 */ |
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122 #define VDC_RETRIES 10 |
1991 | 123 |
124 #define VDC_USEC_TIMEOUT_MIN (30 * MICROSEC) /* 30 sec */ | |
125 | |
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126 /* |
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127 * This macro returns the number of Hz that the vdc driver should wait before |
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128 * a timeout is triggered. The 'timeout' parameter specifiecs the wait |
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129 * time in Hz. The 'mul' parameter allows for a multiplier to be |
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130 * specified allowing for a backoff to be implemented (e.g. using the |
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131 * retry number as a multiplier) where the wait time will get longer if |
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132 * there is no response on the previous retry. |
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133 */ |
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134 #define VD_GET_TIMEOUT_HZ(timeout, mul) \ |
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135 (ddi_get_lbolt() + ((timeout) * MAX(1, (mul)))) |
1991 | 136 |
137 /* | |
138 * Macros to manipulate Descriptor Ring variables in the soft state | |
139 * structure. | |
140 */ | |
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141 #define VDC_GET_NEXT_REQ_ID(vdc) ((vdc)->req_id++) |
1991 | 142 |
143 #define VDC_GET_DRING_ENTRY_PTR(vdc, idx) \ | |
5365 | 144 (vd_dring_entry_t *)(uintptr_t)((vdc)->dring_mem_info.vaddr + \ |
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145 (idx * (vdc)->dring_entry_size)) |
1991 | 146 |
147 #define VDC_MARK_DRING_ENTRY_FREE(vdc, idx) \ | |
148 { \ | |
149 vd_dring_entry_t *dep = NULL; \ | |
150 ASSERT(vdc != NULL); \ | |
5365 | 151 ASSERT(idx < vdc->dring_len); \ |
1991 | 152 ASSERT(vdc->dring_mem_info.vaddr != NULL); \ |
5365 | 153 dep = (vd_dring_entry_t *)(uintptr_t) \ |
154 (vdc->dring_mem_info.vaddr + \ | |
1991 | 155 (idx * vdc->dring_entry_size)); \ |
156 ASSERT(dep != NULL); \ | |
157 dep->hdr.dstate = VIO_DESC_FREE; \ | |
158 } | |
159 | |
160 /* Initialise the Session ID and Sequence Num in the DRing msg */ | |
161 #define VDC_INIT_DRING_DATA_MSG_IDS(dmsg, vdc) \ | |
162 ASSERT(vdc != NULL); \ | |
163 dmsg.tag.vio_sid = vdc->session_id; \ | |
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164 dmsg.seq_num = vdc->seq_num; |
1991 | 165 |
166 /* | |
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167 * The states that the read thread can be in. |
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168 */ |
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169 typedef enum vdc_rd_state { |
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170 VDC_READ_IDLE, /* idling - conn is not up */ |
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171 VDC_READ_WAITING, /* waiting for data */ |
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172 VDC_READ_PENDING, /* pending data avail for read */ |
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173 VDC_READ_RESET /* channel was reset - stop reads */ |
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174 } vdc_rd_state_t; |
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175 |
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176 /* |
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177 * The states that the vdc-vds connection can be in. |
1991 | 178 */ |
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179 typedef enum vdc_state { |
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180 VDC_STATE_INIT, /* device is initialized */ |
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181 VDC_STATE_INIT_WAITING, /* waiting for ldc connection */ |
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182 VDC_STATE_NEGOTIATE, /* doing handshake negotiation */ |
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183 VDC_STATE_HANDLE_PENDING, /* handle requests in backup dring */ |
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184 VDC_STATE_FAULTED, /* multipath backend is inaccessible */ |
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185 VDC_STATE_FAILED, /* device is not usable */ |
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186 VDC_STATE_RUNNING, /* running and accepting requests */ |
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187 VDC_STATE_DETACH, /* detaching */ |
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188 VDC_STATE_RESETTING /* resetting connection with vds */ |
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189 } vdc_state_t; |
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190 |
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191 /* |
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192 * States of the service provided by a vds server |
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193 */ |
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194 typedef enum vdc_service_state { |
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195 VDC_SERVICE_NONE = -1, /* no state define */ |
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196 VDC_SERVICE_OFFLINE, /* no connection with the service */ |
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197 VDC_SERVICE_CONNECTED, /* connection established */ |
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198 VDC_SERVICE_ONLINE, /* connection and backend available */ |
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199 VDC_SERVICE_FAILED, /* connection failed */ |
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200 VDC_SERVICE_FAULTED /* connection but backend unavailable */ |
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201 } vdc_service_state_t; |
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202 |
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203 /* |
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204 * The states that the vdc instance can be in. |
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205 */ |
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206 typedef enum vdc_lc_state { |
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207 VDC_LC_ATTACHING, /* driver is attaching */ |
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208 VDC_LC_ONLINE, /* driver is attached and online */ |
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209 VDC_LC_DETACHING /* driver is detaching */ |
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210 } vdc_lc_state_t; |
1991 | 211 |
212 /* | |
213 * Local Descriptor Ring entry | |
214 * | |
215 * vdc creates a Local (private) descriptor ring the same size as the | |
216 * public descriptor ring it exports to vds. | |
217 */ | |
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218 |
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219 typedef enum { |
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220 VIO_read_dir, /* read data from server */ |
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221 VIO_write_dir, /* write data to server */ |
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222 VIO_both_dir /* transfer both in and out in same buffer */ |
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223 } vio_desc_direction_t; |
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224 |
1991 | 225 typedef struct vdc_local_desc { |
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226 boolean_t is_free; /* local state - inuse or not */ |
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227 |
1991 | 228 int operation; /* VD_OP_xxx to be performed */ |
229 caddr_t addr; /* addr passed in by consumer */ | |
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230 int slice; |
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231 diskaddr_t offset; /* disk offset */ |
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232 size_t nbytes; |
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233 struct buf *buf; /* buf of operation */ |
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234 vio_desc_direction_t dir; /* direction of transfer */ |
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235 int flags; /* flags of operation */ |
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236 |
1991 | 237 caddr_t align_addr; /* used if addr non-aligned */ |
238 ldc_mem_handle_t desc_mhdl; /* Mem handle of buf */ | |
239 vd_dring_entry_t *dep; /* public Dring Entry Pointer */ | |
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240 |
1991 | 241 } vdc_local_desc_t; |
242 | |
243 /* | |
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244 * I/O queue used for checking backend or failfast |
5658 | 245 */ |
246 typedef struct vdc_io { | |
247 struct vdc_io *vio_next; /* next pending I/O in the queue */ | |
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248 int vio_index; /* descriptor index */ |
5658 | 249 clock_t vio_qtime; /* time the I/O was queued */ |
250 } vdc_io_t; | |
251 | |
252 /* | |
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253 * Per vDisk server channel states |
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254 */ |
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255 #define VDC_LDC_INIT 0x0001 |
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256 #define VDC_LDC_CB 0x0002 |
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257 #define VDC_LDC_OPEN 0x0004 |
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258 #define VDC_LDC (VDC_LDC_INIT | VDC_LDC_CB | VDC_LDC_OPEN) |
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259 |
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260 /* |
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261 * vDisk server information |
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262 */ |
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263 typedef struct vdc_server { |
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264 struct vdc_server *next; /* Next server */ |
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265 struct vdc *vdcp; /* Ptr to vdc struct */ |
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266 uint64_t id; /* Server port id */ |
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267 uint64_t state; /* Server state */ |
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268 vdc_service_state_t svc_state; /* Service state */ |
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269 vdc_service_state_t log_state; /* Last state logged */ |
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270 uint64_t ldc_id; /* Server LDC id */ |
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271 ldc_handle_t ldc_handle; /* Server LDC handle */ |
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272 ldc_status_t ldc_state; /* Server LDC state */ |
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273 uint64_t ctimeout; /* conn tmout (secs) */ |
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274 } vdc_server_t; |
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275 |
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276 /* |
1991 | 277 * vdc soft state structure |
278 */ | |
279 typedef struct vdc { | |
280 | |
281 kmutex_t lock; /* protects next 2 sections of vars */ | |
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282 kcondvar_t running_cv; /* signal when upper layers can send */ |
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283 kcondvar_t initwait_cv; /* signal when ldc conn is up */ |
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284 kcondvar_t dring_free_cv; /* signal when desc is avail */ |
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285 kcondvar_t membind_cv; /* signal when mem can be bound */ |
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286 boolean_t self_reset; /* self initiated reset */ |
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287 kcondvar_t io_pending_cv; /* signal on pending I/O */ |
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288 boolean_t io_pending; /* pending I/O */ |
1991 | 289 |
290 int initialized; /* keeps track of what's init'ed */ | |
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291 vdc_lc_state_t lifecycle; /* Current state of the vdc instance */ |
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292 |
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293 int hshake_cnt; /* number of failed handshakes */ |
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294 uint8_t open[OTYPCNT]; /* mask of opened slices */ |
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295 uint8_t open_excl; /* mask of exclusively opened slices */ |
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296 ulong_t open_lyr[V_NUMPAR]; /* number of layered opens */ |
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297 int dkio_flush_pending; /* # outstanding DKIO flushes */ |
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298 int validate_pending; /* # outstanding validate request */ |
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299 vd_disk_label_t vdisk_label; /* label type of device/disk imported */ |
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300 struct extvtoc *vtoc; /* structure to store VTOC data */ |
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301 struct dk_geom *geom; /* structure to store geometry data */ |
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302 vd_slice_t slice[V_NUMPAR]; /* logical partitions */ |
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303 |
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304 kthread_t *msg_proc_thr; /* main msg processing thread */ |
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305 |
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306 kmutex_t read_lock; /* lock to protect read */ |
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307 kcondvar_t read_cv; /* cv to wait for READ events */ |
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308 vdc_rd_state_t read_state; /* current read state */ |
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309 |
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310 uint32_t sync_op_cnt; /* num of active sync operations */ |
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311 boolean_t sync_op_blocked; /* blocked waiting to do sync op */ |
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312 kcondvar_t sync_blocked_cv; /* cv wait for other syncs to finish */ |
1991 | 313 |
314 uint64_t session_id; /* common ID sent with all messages */ | |
315 uint64_t seq_num; /* most recent sequence num generated */ | |
316 uint64_t seq_num_reply; /* Last seq num ACK/NACK'ed by vds */ | |
317 uint64_t req_id; /* Most recent Request ID generated */ | |
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318 uint64_t req_id_proc; /* Last request ID processed by vdc */ |
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319 vdc_state_t state; /* Current disk client-server state */ |
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320 |
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321 dev_info_t *dip; /* device info pointer */ |
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322 int instance; /* driver instance number */ |
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323 |
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324 vio_ver_t ver; /* version number agreed with server */ |
1991 | 325 vd_disk_type_t vdisk_type; /* type of device/disk being imported */ |
5365 | 326 uint32_t vdisk_media; /* physical media type of vDisk */ |
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327 uint64_t vdisk_size; /* device size in blocks */ |
1991 | 328 uint64_t max_xfer_sz; /* maximum block size of a descriptor */ |
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329 uint64_t vdisk_bsize; /* blk size for the virtual disk */ |
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330 uint32_t vio_bmask; /* mask to check vio blk alignment */ |
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331 int vio_bshift; /* shift for vio blk conversion */ |
5365 | 332 uint64_t operations; /* bitmask of ops. server supports */ |
1991 | 333 struct dk_cinfo *cinfo; /* structure to store DKIOCINFO data */ |
334 struct dk_minfo *minfo; /* structure for DKIOCGMEDIAINFO data */ | |
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335 ddi_devid_t devid; /* device id */ |
4848 | 336 boolean_t ctimeout_reached; /* connection timeout has expired */ |
1991 | 337 |
5658 | 338 /* |
339 * The ownership fields are protected by the lock mutex. The | |
340 * ownership_lock mutex is used to serialize ownership operations; | |
341 * it should be acquired before the lock mutex. | |
342 */ | |
343 kmutex_t ownership_lock; /* serialize ownership ops */ | |
344 int ownership; /* ownership status flags */ | |
345 kthread_t *ownership_thread; /* ownership thread */ | |
346 kcondvar_t ownership_cv; /* cv for ownership update */ | |
347 | |
348 /* | |
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349 * The eio and failfast fields are protected by the lock mutex. |
5658 | 350 */ |
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351 kthread_t *eio_thread; /* error io thread */ |
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352 kcondvar_t eio_cv; /* cv for eio thread update */ |
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353 vdc_io_t *eio_queue; /* error io queue */ |
5658 | 354 clock_t failfast_interval; /* interval in microsecs */ |
355 | |
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356 /* |
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357 * kstats used to store I/O statistics consumed by iostat(1M). |
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358 * These are protected by the lock mutex. |
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359 */ |
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360 kstat_t *io_stats; |
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361 kstat_t *err_stats; |
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362 |
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363 ldc_dring_handle_t dring_hdl; /* dring handle */ |
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364 ldc_mem_info_t dring_mem_info; /* dring information */ |
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365 uint_t dring_curr_idx; /* current index */ |
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366 uint32_t dring_len; /* dring length */ |
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367 uint32_t dring_max_cookies; /* dring max cookies */ |
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368 uint32_t dring_cookie_count; /* num cookies */ |
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369 uint32_t dring_entry_size; /* descriptor size */ |
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370 ldc_mem_cookie_t *dring_cookie; /* dring cookies */ |
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371 uint64_t dring_ident; /* dring ident */ |
1991 | 372 |
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373 uint64_t threads_pending; /* num of threads */ |
1991 | 374 |
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375 vdc_local_desc_t *local_dring; /* local dring */ |
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376 vdc_local_desc_t *local_dring_backup; /* local dring backup */ |
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377 int local_dring_backup_tail; /* backup dring tail */ |
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378 int local_dring_backup_len; /* backup dring len */ |
1991 | 379 |
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380 int num_servers; /* no. of servers */ |
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381 vdc_server_t *server_list; /* vdisk server list */ |
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382 vdc_server_t *curr_server; /* curr vdisk server */ |
1991 | 383 } vdc_t; |
384 | |
385 /* | |
5658 | 386 * Ownership status flags |
387 */ | |
388 #define VDC_OWNERSHIP_NONE 0x00 /* no ownership wanted */ | |
389 #define VDC_OWNERSHIP_WANTED 0x01 /* ownership is wanted */ | |
390 #define VDC_OWNERSHIP_GRANTED 0x02 /* ownership has been granted */ | |
391 #define VDC_OWNERSHIP_RESET 0x04 /* ownership has been reset */ | |
392 | |
393 /* | |
394 * Reservation conflict panic message | |
395 */ | |
396 #define VDC_RESV_CONFLICT_FMT_STR "Reservation Conflict\nDisk: " | |
397 #define VDC_RESV_CONFLICT_FMT_LEN (sizeof (VDC_RESV_CONFLICT_FMT_STR)) | |
398 | |
399 /* | |
1991 | 400 * Debugging macros |
401 */ | |
402 #ifdef DEBUG | |
403 extern int vdc_msglevel; | |
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404 extern uint64_t vdc_matchinst; |
1991 | 405 |
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406 #define DMSG(_vdc, err_level, format, ...) \ |
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407 do { \ |
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408 if (vdc_msglevel > err_level && \ |
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409 (vdc_matchinst & (1ull << (_vdc)->instance))) \ |
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410 cmn_err(CE_CONT, "?[%d,t@%p] %s: "format, \ |
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411 (_vdc)->instance, (void *)curthread, \ |
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412 __func__, __VA_ARGS__); \ |
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413 _NOTE(CONSTANTCONDITION) \ |
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414 } while (0); |
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415 |
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416 #define DMSGX(err_level, format, ...) \ |
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417 do { \ |
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418 if (vdc_msglevel > err_level) \ |
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419 cmn_err(CE_CONT, "?%s: "format, __func__, __VA_ARGS__);\ |
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420 _NOTE(CONSTANTCONDITION) \ |
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421 } while (0); |
1991 | 422 |
423 #define VDC_DUMP_DRING_MSG(dmsgp) \ | |
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424 DMSGX(0, "sq:%lu start:%d end:%d ident:%lu\n", \ |
1991 | 425 dmsgp->seq_num, dmsgp->start_idx, \ |
426 dmsgp->end_idx, dmsgp->dring_ident); | |
427 | |
428 #else /* !DEBUG */ | |
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429 #define DMSG(err_level, ...) |
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430 #define DMSGX(err_level, format, ...) |
1991 | 431 #define VDC_DUMP_DRING_MSG(dmsgp) |
432 | |
433 #endif /* !DEBUG */ | |
434 | |
435 #ifdef __cplusplus | |
436 } | |
437 #endif | |
438 | |
439 #endif /* _VDC_H */ |