Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 1 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | * iSCSI transport class definitions |
| 3 | * |
| 4 | * Copyright (C) IBM Corporation, 2004 |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 5 | * Copyright (C) Mike Christie, 2004 - 2005 |
| 6 | * Copyright (C) Dmitry Yusupov, 2004 - 2005 |
| 7 | * Copyright (C) Alex Aizman, 2004 - 2005 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License as published by |
| 11 | * the Free Software Foundation; either version 2 of the License, or |
| 12 | * (at your option) any later version. |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | * GNU General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU General Public License |
| 20 | * along with this program; if not, write to the Free Software |
| 21 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 22 | */ |
| 23 | #include <linux/module.h> |
Tim Schmielau | 4e57b68 | 2005-10-30 15:03:48 -0800 | [diff] [blame] | 24 | #include <linux/string.h> |
| 25 | #include <linux/slab.h> |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 26 | #include <linux/mempool.h> |
| 27 | #include <net/tcp.h> |
Tim Schmielau | 4e57b68 | 2005-10-30 15:03:48 -0800 | [diff] [blame] | 28 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | #include <scsi/scsi.h> |
| 30 | #include <scsi/scsi_host.h> |
| 31 | #include <scsi/scsi_device.h> |
| 32 | #include <scsi/scsi_transport.h> |
| 33 | #include <scsi/scsi_transport_iscsi.h> |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 34 | #include <scsi/iscsi_if.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 36 | #define ISCSI_SESSION_ATTRS 8 |
| 37 | #define ISCSI_CONN_ATTRS 6 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | |
| 39 | struct iscsi_internal { |
| 40 | struct scsi_transport_template t; |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 41 | struct iscsi_transport *iscsi_transport; |
| 42 | struct list_head list; |
| 43 | /* |
| 44 | * List of sessions for this transport |
| 45 | */ |
| 46 | struct list_head sessions; |
| 47 | /* |
| 48 | * lock to serialize access to the sessions list which must |
| 49 | * be taken after the rx_queue_sema |
| 50 | */ |
| 51 | spinlock_t session_lock; |
| 52 | /* |
| 53 | * based on transport capabilities, at register time we set these |
| 54 | * bits to tell the transport class it wants attributes displayed |
| 55 | * in sysfs or that it can support different iSCSI Data-Path |
| 56 | * capabilities |
| 57 | */ |
| 58 | uint32_t param_mask; |
| 59 | |
| 60 | struct class_device cdev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | /* |
| 62 | * We do not have any private or other attrs. |
| 63 | */ |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 64 | struct transport_container conn_cont; |
| 65 | struct class_device_attribute *conn_attrs[ISCSI_CONN_ATTRS + 1]; |
| 66 | struct transport_container session_cont; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | struct class_device_attribute *session_attrs[ISCSI_SESSION_ATTRS + 1]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | }; |
| 69 | |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 70 | /* |
| 71 | * list of registered transports and lock that must |
| 72 | * be held while accessing list. The iscsi_transport_lock must |
| 73 | * be acquired after the rx_queue_sema. |
| 74 | */ |
| 75 | static LIST_HEAD(iscsi_transports); |
| 76 | static DEFINE_SPINLOCK(iscsi_transport_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 78 | #define to_iscsi_internal(tmpl) \ |
| 79 | container_of(tmpl, struct iscsi_internal, t) |
| 80 | |
| 81 | #define cdev_to_iscsi_internal(_cdev) \ |
| 82 | container_of(_cdev, struct iscsi_internal, cdev) |
| 83 | |
| 84 | static void iscsi_transport_release(struct class_device *cdev) |
| 85 | { |
| 86 | struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev); |
| 87 | kfree(priv); |
| 88 | } |
| 89 | |
| 90 | /* |
| 91 | * iscsi_transport_class represents the iscsi_transports that are |
| 92 | * registered. |
| 93 | */ |
| 94 | static struct class iscsi_transport_class = { |
| 95 | .name = "iscsi_transport", |
| 96 | .release = iscsi_transport_release, |
| 97 | }; |
| 98 | |
| 99 | static ssize_t |
| 100 | show_transport_handle(struct class_device *cdev, char *buf) |
| 101 | { |
| 102 | struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev); |
Mike Christie | 762e2bf | 2005-09-12 21:01:46 -0500 | [diff] [blame] | 103 | return sprintf(buf, "%llu\n", (unsigned long long)iscsi_handle(priv->iscsi_transport)); |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 104 | } |
| 105 | static CLASS_DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL); |
| 106 | |
| 107 | #define show_transport_attr(name, format) \ |
| 108 | static ssize_t \ |
| 109 | show_transport_##name(struct class_device *cdev, char *buf) \ |
| 110 | { \ |
| 111 | struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev); \ |
| 112 | return sprintf(buf, format"\n", priv->iscsi_transport->name); \ |
| 113 | } \ |
| 114 | static CLASS_DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL); |
| 115 | |
| 116 | show_transport_attr(caps, "0x%x"); |
| 117 | show_transport_attr(max_lun, "%d"); |
| 118 | show_transport_attr(max_conn, "%d"); |
| 119 | show_transport_attr(max_cmd_len, "%d"); |
| 120 | |
| 121 | static struct attribute *iscsi_transport_attrs[] = { |
| 122 | &class_device_attr_handle.attr, |
| 123 | &class_device_attr_caps.attr, |
| 124 | &class_device_attr_max_lun.attr, |
| 125 | &class_device_attr_max_conn.attr, |
| 126 | &class_device_attr_max_cmd_len.attr, |
| 127 | NULL, |
| 128 | }; |
| 129 | |
| 130 | static struct attribute_group iscsi_transport_group = { |
| 131 | .attrs = iscsi_transport_attrs, |
| 132 | }; |
| 133 | |
| 134 | static DECLARE_TRANSPORT_CLASS(iscsi_session_class, |
| 135 | "iscsi_session", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | NULL, |
| 137 | NULL, |
| 138 | NULL); |
| 139 | |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 140 | static DECLARE_TRANSPORT_CLASS(iscsi_connection_class, |
| 141 | "iscsi_connection", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | NULL, |
| 143 | NULL, |
| 144 | NULL); |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 145 | |
| 146 | static struct sock *nls; |
| 147 | static int daemon_pid; |
| 148 | static DECLARE_MUTEX(rx_queue_sema); |
| 149 | |
| 150 | struct mempool_zone { |
| 151 | mempool_t *pool; |
| 152 | atomic_t allocated; |
| 153 | int size; |
| 154 | int hiwat; |
| 155 | struct list_head freequeue; |
| 156 | spinlock_t freelock; |
| 157 | }; |
| 158 | |
| 159 | static struct mempool_zone z_reply; |
| 160 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | /* |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 162 | * Z_MAX_* - actual mempool size allocated at the mempool_zone_init() time |
| 163 | * Z_HIWAT_* - zone's high watermark when if_error bit will be set to -ENOMEM |
| 164 | * so daemon will notice OOM on NETLINK tranposrt level and will |
| 165 | * be able to predict or change operational behavior |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | */ |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 167 | #define Z_MAX_REPLY 8 |
| 168 | #define Z_HIWAT_REPLY 6 |
| 169 | #define Z_MAX_PDU 8 |
| 170 | #define Z_HIWAT_PDU 6 |
| 171 | #define Z_MAX_ERROR 16 |
| 172 | #define Z_HIWAT_ERROR 12 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 174 | struct iscsi_if_conn { |
| 175 | struct list_head conn_list; /* item in connlist */ |
| 176 | struct list_head session_list; /* item in session->connections */ |
| 177 | iscsi_connh_t connh; |
| 178 | int active; /* must be accessed with the connlock */ |
| 179 | struct Scsi_Host *host; /* originated shost */ |
| 180 | struct device dev; /* sysfs transport/container device */ |
| 181 | struct iscsi_transport *transport; |
| 182 | struct mempool_zone z_error; |
| 183 | struct mempool_zone z_pdu; |
| 184 | struct list_head freequeue; |
| 185 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 187 | #define iscsi_dev_to_if_conn(_dev) \ |
| 188 | container_of(_dev, struct iscsi_if_conn, dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 190 | #define iscsi_cdev_to_if_conn(_cdev) \ |
| 191 | iscsi_dev_to_if_conn(_cdev->dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 193 | static LIST_HEAD(connlist); |
| 194 | static DEFINE_SPINLOCK(connlock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 196 | struct iscsi_if_session { |
| 197 | struct list_head list; /* item in session_list */ |
| 198 | struct list_head connections; |
| 199 | iscsi_sessionh_t sessionh; |
| 200 | struct iscsi_transport *transport; |
| 201 | struct device dev; /* sysfs transport/container device */ |
| 202 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 204 | #define iscsi_dev_to_if_session(_dev) \ |
| 205 | container_of(_dev, struct iscsi_if_session, dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 207 | #define iscsi_cdev_to_if_session(_cdev) \ |
| 208 | iscsi_dev_to_if_session(_cdev->dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 210 | #define iscsi_if_session_to_shost(_session) \ |
| 211 | dev_to_shost(_session->dev.parent) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 213 | static struct iscsi_if_conn* |
| 214 | iscsi_if_find_conn(uint64_t key) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | { |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 216 | unsigned long flags; |
| 217 | struct iscsi_if_conn *conn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 219 | spin_lock_irqsave(&connlock, flags); |
| 220 | list_for_each_entry(conn, &connlist, conn_list) |
| 221 | if (conn->connh == key) { |
| 222 | spin_unlock_irqrestore(&connlock, flags); |
| 223 | return conn; |
| 224 | } |
| 225 | spin_unlock_irqrestore(&connlock, flags); |
| 226 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 229 | static struct iscsi_internal * |
| 230 | iscsi_if_transport_lookup(struct iscsi_transport *tt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | { |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 232 | struct iscsi_internal *priv; |
| 233 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 234 | |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 235 | spin_lock_irqsave(&iscsi_transport_lock, flags); |
| 236 | list_for_each_entry(priv, &iscsi_transports, list) { |
| 237 | if (tt == priv->iscsi_transport) { |
| 238 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); |
| 239 | return priv; |
| 240 | } |
| 241 | } |
| 242 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); |
| 243 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 246 | static inline struct list_head *skb_to_lh(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | { |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 248 | return (struct list_head *)&skb->cb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | } |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 250 | |
| 251 | static void* |
| 252 | mempool_zone_alloc_skb(unsigned int gfp_mask, void *pool_data) |
| 253 | { |
| 254 | struct mempool_zone *zone = pool_data; |
| 255 | |
| 256 | return alloc_skb(zone->size, gfp_mask); |
| 257 | } |
| 258 | |
| 259 | static void |
| 260 | mempool_zone_free_skb(void *element, void *pool_data) |
| 261 | { |
| 262 | kfree_skb(element); |
| 263 | } |
| 264 | |
| 265 | static void |
| 266 | mempool_zone_complete(struct mempool_zone *zone) |
| 267 | { |
| 268 | unsigned long flags; |
| 269 | struct list_head *lh, *n; |
| 270 | |
| 271 | spin_lock_irqsave(&zone->freelock, flags); |
| 272 | list_for_each_safe(lh, n, &zone->freequeue) { |
| 273 | struct sk_buff *skb = (struct sk_buff *)((char *)lh - |
| 274 | offsetof(struct sk_buff, cb)); |
| 275 | if (!skb_shared(skb)) { |
| 276 | list_del(skb_to_lh(skb)); |
| 277 | mempool_free(skb, zone->pool); |
| 278 | atomic_dec(&zone->allocated); |
| 279 | } |
| 280 | } |
| 281 | spin_unlock_irqrestore(&zone->freelock, flags); |
| 282 | } |
| 283 | |
| 284 | static int |
| 285 | mempool_zone_init(struct mempool_zone *zp, unsigned max, unsigned size, |
| 286 | unsigned hiwat) |
| 287 | { |
| 288 | zp->pool = mempool_create(max, mempool_zone_alloc_skb, |
| 289 | mempool_zone_free_skb, zp); |
| 290 | if (!zp->pool) |
| 291 | return -ENOMEM; |
| 292 | |
| 293 | zp->size = size; |
| 294 | zp->hiwat = hiwat; |
| 295 | |
| 296 | INIT_LIST_HEAD(&zp->freequeue); |
| 297 | spin_lock_init(&zp->freelock); |
| 298 | atomic_set(&zp->allocated, 0); |
| 299 | |
| 300 | return 0; |
| 301 | } |
| 302 | |
| 303 | |
| 304 | static struct sk_buff* |
| 305 | mempool_zone_get_skb(struct mempool_zone *zone) |
| 306 | { |
| 307 | struct sk_buff *skb; |
| 308 | |
| 309 | skb = mempool_alloc(zone->pool, GFP_ATOMIC); |
| 310 | if (skb) |
| 311 | atomic_inc(&zone->allocated); |
| 312 | return skb; |
| 313 | } |
| 314 | |
| 315 | static int |
| 316 | iscsi_unicast_skb(struct mempool_zone *zone, struct sk_buff *skb) |
| 317 | { |
| 318 | unsigned long flags; |
| 319 | int rc; |
| 320 | |
| 321 | skb_get(skb); |
| 322 | rc = netlink_unicast(nls, skb, daemon_pid, MSG_DONTWAIT); |
| 323 | if (rc < 0) { |
| 324 | mempool_free(skb, zone->pool); |
| 325 | printk(KERN_ERR "iscsi: can not unicast skb (%d)\n", rc); |
| 326 | return rc; |
| 327 | } |
| 328 | |
| 329 | spin_lock_irqsave(&zone->freelock, flags); |
| 330 | list_add(skb_to_lh(skb), &zone->freequeue); |
| 331 | spin_unlock_irqrestore(&zone->freelock, flags); |
| 332 | |
| 333 | return 0; |
| 334 | } |
| 335 | |
| 336 | int iscsi_recv_pdu(iscsi_connh_t connh, struct iscsi_hdr *hdr, |
| 337 | char *data, uint32_t data_size) |
| 338 | { |
| 339 | struct nlmsghdr *nlh; |
| 340 | struct sk_buff *skb; |
| 341 | struct iscsi_uevent *ev; |
| 342 | struct iscsi_if_conn *conn; |
| 343 | char *pdu; |
| 344 | int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) + |
| 345 | data_size); |
| 346 | |
| 347 | conn = iscsi_if_find_conn(connh); |
| 348 | BUG_ON(!conn); |
| 349 | |
| 350 | mempool_zone_complete(&conn->z_pdu); |
| 351 | |
| 352 | skb = mempool_zone_get_skb(&conn->z_pdu); |
| 353 | if (!skb) { |
| 354 | iscsi_conn_error(connh, ISCSI_ERR_CONN_FAILED); |
| 355 | printk(KERN_ERR "iscsi%d: can not deliver control PDU: OOM\n", |
| 356 | conn->host->host_no); |
| 357 | return -ENOMEM; |
| 358 | } |
| 359 | |
| 360 | nlh = __nlmsg_put(skb, daemon_pid, 0, 0, (len - sizeof(*nlh)), 0); |
| 361 | ev = NLMSG_DATA(nlh); |
| 362 | memset(ev, 0, sizeof(*ev)); |
| 363 | ev->transport_handle = iscsi_handle(conn->transport); |
| 364 | ev->type = ISCSI_KEVENT_RECV_PDU; |
| 365 | if (atomic_read(&conn->z_pdu.allocated) >= conn->z_pdu.hiwat) |
| 366 | ev->iferror = -ENOMEM; |
| 367 | ev->r.recv_req.conn_handle = connh; |
| 368 | pdu = (char*)ev + sizeof(*ev); |
| 369 | memcpy(pdu, hdr, sizeof(struct iscsi_hdr)); |
| 370 | memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size); |
| 371 | |
| 372 | return iscsi_unicast_skb(&conn->z_pdu, skb); |
| 373 | } |
| 374 | EXPORT_SYMBOL_GPL(iscsi_recv_pdu); |
| 375 | |
| 376 | void iscsi_conn_error(iscsi_connh_t connh, enum iscsi_err error) |
| 377 | { |
| 378 | struct nlmsghdr *nlh; |
| 379 | struct sk_buff *skb; |
| 380 | struct iscsi_uevent *ev; |
| 381 | struct iscsi_if_conn *conn; |
| 382 | int len = NLMSG_SPACE(sizeof(*ev)); |
| 383 | |
| 384 | conn = iscsi_if_find_conn(connh); |
| 385 | BUG_ON(!conn); |
| 386 | |
| 387 | mempool_zone_complete(&conn->z_error); |
| 388 | |
| 389 | skb = mempool_zone_get_skb(&conn->z_error); |
| 390 | if (!skb) { |
| 391 | printk(KERN_ERR "iscsi%d: gracefully ignored conn error (%d)\n", |
| 392 | conn->host->host_no, error); |
| 393 | return; |
| 394 | } |
| 395 | |
| 396 | nlh = __nlmsg_put(skb, daemon_pid, 0, 0, (len - sizeof(*nlh)), 0); |
| 397 | ev = NLMSG_DATA(nlh); |
| 398 | ev->transport_handle = iscsi_handle(conn->transport); |
| 399 | ev->type = ISCSI_KEVENT_CONN_ERROR; |
| 400 | if (atomic_read(&conn->z_error.allocated) >= conn->z_error.hiwat) |
| 401 | ev->iferror = -ENOMEM; |
| 402 | ev->r.connerror.error = error; |
| 403 | ev->r.connerror.conn_handle = connh; |
| 404 | |
| 405 | iscsi_unicast_skb(&conn->z_error, skb); |
| 406 | |
| 407 | printk(KERN_INFO "iscsi%d: detected conn error (%d)\n", |
| 408 | conn->host->host_no, error); |
| 409 | } |
| 410 | EXPORT_SYMBOL_GPL(iscsi_conn_error); |
| 411 | |
| 412 | static int |
| 413 | iscsi_if_send_reply(int pid, int seq, int type, int done, int multi, |
| 414 | void *payload, int size) |
| 415 | { |
| 416 | struct sk_buff *skb; |
| 417 | struct nlmsghdr *nlh; |
| 418 | int len = NLMSG_SPACE(size); |
| 419 | int flags = multi ? NLM_F_MULTI : 0; |
| 420 | int t = done ? NLMSG_DONE : type; |
| 421 | |
| 422 | mempool_zone_complete(&z_reply); |
| 423 | |
| 424 | skb = mempool_zone_get_skb(&z_reply); |
| 425 | /* |
| 426 | * FIXME: |
| 427 | * user is supposed to react on iferror == -ENOMEM; |
| 428 | * see iscsi_if_rx(). |
| 429 | */ |
| 430 | BUG_ON(!skb); |
| 431 | |
| 432 | nlh = __nlmsg_put(skb, pid, seq, t, (len - sizeof(*nlh)), 0); |
| 433 | nlh->nlmsg_flags = flags; |
| 434 | memcpy(NLMSG_DATA(nlh), payload, size); |
| 435 | return iscsi_unicast_skb(&z_reply, skb); |
| 436 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | |
| 438 | /* |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 439 | * iSCSI Session's hostdata organization: |
| 440 | * |
| 441 | * *------------------* <== host->hostdata |
| 442 | * | transport | |
| 443 | * |------------------| <== iscsi_hostdata(host->hostdata) |
| 444 | * | transport's data | |
| 445 | * |------------------| <== hostdata_session(host->hostdata) |
| 446 | * | interface's data | |
| 447 | * *------------------* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | */ |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 449 | |
| 450 | #define hostdata_privsize(_t) (sizeof(unsigned long) + _t->hostdata_size + \ |
| 451 | _t->hostdata_size % sizeof(unsigned long) + \ |
| 452 | sizeof(struct iscsi_if_session)) |
| 453 | |
| 454 | #define hostdata_session(_hostdata) ((void*)_hostdata + sizeof(unsigned long) + \ |
| 455 | ((struct iscsi_transport *) \ |
| 456 | iscsi_ptr(*(uint64_t *)_hostdata))->hostdata_size) |
| 457 | |
| 458 | static void iscsi_if_session_dev_release(struct device *dev) |
| 459 | { |
| 460 | struct iscsi_if_session *session = iscsi_dev_to_if_session(dev); |
| 461 | struct iscsi_transport *transport = session->transport; |
| 462 | struct Scsi_Host *shost = iscsi_if_session_to_shost(session); |
| 463 | struct iscsi_if_conn *conn, *tmp; |
| 464 | unsigned long flags; |
| 465 | |
| 466 | /* now free connections */ |
| 467 | spin_lock_irqsave(&connlock, flags); |
| 468 | list_for_each_entry_safe(conn, tmp, &session->connections, |
| 469 | session_list) { |
| 470 | list_del(&conn->session_list); |
| 471 | mempool_destroy(conn->z_pdu.pool); |
| 472 | mempool_destroy(conn->z_error.pool); |
| 473 | kfree(conn); |
| 474 | } |
| 475 | spin_unlock_irqrestore(&connlock, flags); |
| 476 | scsi_host_put(shost); |
| 477 | module_put(transport->owner); |
| 478 | } |
| 479 | |
| 480 | static int |
| 481 | iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_uevent *ev) |
| 482 | { |
| 483 | struct iscsi_transport *transport = priv->iscsi_transport; |
| 484 | struct iscsi_if_session *session; |
| 485 | struct Scsi_Host *shost; |
| 486 | unsigned long flags; |
| 487 | int error; |
| 488 | |
| 489 | if (!try_module_get(transport->owner)) |
| 490 | return -EPERM; |
| 491 | |
| 492 | shost = scsi_host_alloc(transport->host_template, |
| 493 | hostdata_privsize(transport)); |
| 494 | if (!shost) { |
| 495 | ev->r.c_session_ret.session_handle = iscsi_handle(NULL); |
| 496 | printk(KERN_ERR "iscsi: can not allocate SCSI host for " |
| 497 | "session\n"); |
| 498 | error = -ENOMEM; |
| 499 | goto out_module_put; |
| 500 | } |
| 501 | shost->max_id = 1; |
| 502 | shost->max_channel = 0; |
| 503 | shost->max_lun = transport->max_lun; |
| 504 | shost->max_cmd_len = transport->max_cmd_len; |
| 505 | shost->transportt = &priv->t; |
| 506 | |
| 507 | /* store struct iscsi_transport in hostdata */ |
| 508 | *(uint64_t*)shost->hostdata = ev->transport_handle; |
| 509 | |
| 510 | ev->r.c_session_ret.session_handle = transport->create_session( |
| 511 | ev->u.c_session.initial_cmdsn, shost); |
| 512 | if (ev->r.c_session_ret.session_handle == iscsi_handle(NULL)) { |
| 513 | error = 0; |
| 514 | goto out_host_put; |
| 515 | } |
| 516 | |
| 517 | /* host_no becomes assigned SID */ |
| 518 | ev->r.c_session_ret.sid = shost->host_no; |
| 519 | /* initialize session */ |
| 520 | session = hostdata_session(shost->hostdata); |
| 521 | INIT_LIST_HEAD(&session->connections); |
| 522 | INIT_LIST_HEAD(&session->list); |
| 523 | session->sessionh = ev->r.c_session_ret.session_handle; |
| 524 | session->transport = transport; |
| 525 | |
| 526 | error = scsi_add_host(shost, NULL); |
| 527 | if (error) |
| 528 | goto out_destroy_session; |
| 529 | |
| 530 | /* |
| 531 | * this is released in the dev's release function) |
| 532 | */ |
| 533 | scsi_host_get(shost); |
| 534 | snprintf(session->dev.bus_id, BUS_ID_SIZE, "session%u", shost->host_no); |
| 535 | session->dev.parent = &shost->shost_gendev; |
| 536 | session->dev.release = iscsi_if_session_dev_release; |
| 537 | error = device_register(&session->dev); |
| 538 | if (error) { |
| 539 | printk(KERN_ERR "iscsi: could not register session%d's dev\n", |
| 540 | shost->host_no); |
| 541 | goto out_remove_host; |
| 542 | } |
| 543 | transport_register_device(&session->dev); |
| 544 | |
| 545 | /* add this session to the list of active sessions */ |
| 546 | spin_lock_irqsave(&priv->session_lock, flags); |
| 547 | list_add(&session->list, &priv->sessions); |
| 548 | spin_unlock_irqrestore(&priv->session_lock, flags); |
| 549 | |
| 550 | return 0; |
| 551 | |
| 552 | out_remove_host: |
| 553 | scsi_remove_host(shost); |
| 554 | out_destroy_session: |
| 555 | transport->destroy_session(ev->r.c_session_ret.session_handle); |
| 556 | ev->r.c_session_ret.session_handle = iscsi_handle(NULL); |
| 557 | out_host_put: |
| 558 | scsi_host_put(shost); |
| 559 | out_module_put: |
| 560 | module_put(transport->owner); |
| 561 | return error; |
| 562 | } |
| 563 | |
| 564 | static int |
| 565 | iscsi_if_destroy_session(struct iscsi_internal *priv, struct iscsi_uevent *ev) |
| 566 | { |
| 567 | struct iscsi_transport *transport = priv->iscsi_transport; |
| 568 | struct Scsi_Host *shost; |
| 569 | struct iscsi_if_session *session; |
| 570 | unsigned long flags; |
| 571 | struct iscsi_if_conn *conn; |
| 572 | int error = 0; |
| 573 | |
| 574 | shost = scsi_host_lookup(ev->u.d_session.sid); |
| 575 | if (shost == ERR_PTR(-ENXIO)) |
| 576 | return -EEXIST; |
| 577 | session = hostdata_session(shost->hostdata); |
| 578 | |
| 579 | /* check if we have active connections */ |
| 580 | spin_lock_irqsave(&connlock, flags); |
| 581 | list_for_each_entry(conn, &session->connections, session_list) { |
| 582 | if (conn->active) { |
| 583 | printk(KERN_ERR "iscsi%d: can not destroy session: " |
| 584 | "has active connection (%p)\n", |
| 585 | shost->host_no, iscsi_ptr(conn->connh)); |
| 586 | spin_unlock_irqrestore(&connlock, flags); |
| 587 | error = EIO; |
| 588 | goto out_release_ref; |
| 589 | } |
| 590 | } |
| 591 | spin_unlock_irqrestore(&connlock, flags); |
| 592 | |
| 593 | scsi_remove_host(shost); |
| 594 | transport->destroy_session(ev->u.d_session.session_handle); |
| 595 | transport_unregister_device(&session->dev); |
| 596 | device_unregister(&session->dev); |
| 597 | |
| 598 | /* remove this session from the list of active sessions */ |
| 599 | spin_lock_irqsave(&priv->session_lock, flags); |
| 600 | list_del(&session->list); |
| 601 | spin_unlock_irqrestore(&priv->session_lock, flags); |
| 602 | |
| 603 | /* ref from host alloc */ |
| 604 | scsi_host_put(shost); |
| 605 | out_release_ref: |
| 606 | /* ref from host lookup */ |
| 607 | scsi_host_put(shost); |
| 608 | return error; |
| 609 | } |
| 610 | |
| 611 | static void iscsi_if_conn_dev_release(struct device *dev) |
| 612 | { |
| 613 | struct iscsi_if_conn *conn = iscsi_dev_to_if_conn(dev); |
| 614 | struct Scsi_Host *shost = conn->host; |
| 615 | |
| 616 | scsi_host_put(shost); |
| 617 | } |
| 618 | |
| 619 | static int |
| 620 | iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev) |
| 621 | { |
| 622 | struct iscsi_if_session *session; |
| 623 | struct Scsi_Host *shost; |
| 624 | struct iscsi_if_conn *conn; |
| 625 | unsigned long flags; |
| 626 | int error; |
| 627 | |
| 628 | shost = scsi_host_lookup(ev->u.c_conn.sid); |
| 629 | if (shost == ERR_PTR(-ENXIO)) |
| 630 | return -EEXIST; |
| 631 | session = hostdata_session(shost->hostdata); |
| 632 | |
| 633 | conn = kmalloc(sizeof(struct iscsi_if_conn), GFP_KERNEL); |
| 634 | if (!conn) { |
| 635 | error = -ENOMEM; |
| 636 | goto out_release_ref; |
| 637 | } |
| 638 | memset(conn, 0, sizeof(struct iscsi_if_conn)); |
| 639 | INIT_LIST_HEAD(&conn->session_list); |
| 640 | INIT_LIST_HEAD(&conn->conn_list); |
| 641 | conn->host = shost; |
| 642 | conn->transport = transport; |
| 643 | |
| 644 | error = mempool_zone_init(&conn->z_pdu, Z_MAX_PDU, |
| 645 | NLMSG_SPACE(sizeof(struct iscsi_uevent) + |
| 646 | sizeof(struct iscsi_hdr) + |
| 647 | DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH), |
| 648 | Z_HIWAT_PDU); |
| 649 | if (error) { |
| 650 | printk(KERN_ERR "iscsi%d: can not allocate pdu zone for new " |
| 651 | "conn\n", shost->host_no); |
| 652 | goto out_free_conn; |
| 653 | } |
| 654 | error = mempool_zone_init(&conn->z_error, Z_MAX_ERROR, |
| 655 | NLMSG_SPACE(sizeof(struct iscsi_uevent)), |
| 656 | Z_HIWAT_ERROR); |
| 657 | if (error) { |
| 658 | printk(KERN_ERR "iscsi%d: can not allocate error zone for " |
| 659 | "new conn\n", shost->host_no); |
| 660 | goto out_free_pdu_pool; |
| 661 | } |
| 662 | |
| 663 | ev->r.handle = transport->create_conn(ev->u.c_conn.session_handle, |
| 664 | ev->u.c_conn.cid); |
| 665 | if (!ev->r.handle) { |
| 666 | error = -ENODEV; |
| 667 | goto out_free_error_pool; |
| 668 | } |
| 669 | |
| 670 | conn->connh = ev->r.handle; |
| 671 | |
| 672 | /* |
| 673 | * this is released in the dev's release function |
| 674 | */ |
| 675 | if (!scsi_host_get(shost)) |
| 676 | goto out_destroy_conn; |
| 677 | snprintf(conn->dev.bus_id, BUS_ID_SIZE, "connection%d:%u", |
| 678 | shost->host_no, ev->u.c_conn.cid); |
| 679 | conn->dev.parent = &session->dev; |
| 680 | conn->dev.release = iscsi_if_conn_dev_release; |
| 681 | error = device_register(&conn->dev); |
| 682 | if (error) { |
| 683 | printk(KERN_ERR "iscsi%d: could not register connections%u " |
| 684 | "dev\n", shost->host_no, ev->u.c_conn.cid); |
| 685 | goto out_release_parent_ref; |
| 686 | } |
| 687 | transport_register_device(&conn->dev); |
| 688 | |
| 689 | spin_lock_irqsave(&connlock, flags); |
| 690 | list_add(&conn->conn_list, &connlist); |
| 691 | list_add(&conn->session_list, &session->connections); |
| 692 | conn->active = 1; |
| 693 | spin_unlock_irqrestore(&connlock, flags); |
| 694 | |
| 695 | scsi_host_put(shost); |
| 696 | return 0; |
| 697 | |
| 698 | out_release_parent_ref: |
| 699 | scsi_host_put(shost); |
| 700 | out_destroy_conn: |
| 701 | transport->destroy_conn(ev->r.handle); |
| 702 | out_free_error_pool: |
| 703 | mempool_destroy(conn->z_error.pool); |
| 704 | out_free_pdu_pool: |
| 705 | mempool_destroy(conn->z_pdu.pool); |
| 706 | out_free_conn: |
| 707 | kfree(conn); |
| 708 | out_release_ref: |
| 709 | scsi_host_put(shost); |
| 710 | return error; |
| 711 | } |
| 712 | |
| 713 | static int |
| 714 | iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev) |
| 715 | { |
| 716 | unsigned long flags; |
| 717 | struct iscsi_if_conn *conn; |
| 718 | |
| 719 | conn = iscsi_if_find_conn(ev->u.d_conn.conn_handle); |
| 720 | if (!conn) |
| 721 | return -EEXIST; |
| 722 | |
| 723 | transport->destroy_conn(ev->u.d_conn.conn_handle); |
| 724 | |
| 725 | spin_lock_irqsave(&connlock, flags); |
| 726 | conn->active = 0; |
| 727 | list_del(&conn->conn_list); |
| 728 | spin_unlock_irqrestore(&connlock, flags); |
| 729 | |
| 730 | transport_unregister_device(&conn->dev); |
| 731 | device_unregister(&conn->dev); |
| 732 | return 0; |
| 733 | } |
| 734 | |
| 735 | static int |
| 736 | iscsi_if_get_stats(struct iscsi_transport *transport, struct sk_buff *skb, |
| 737 | struct nlmsghdr *nlh) |
| 738 | { |
| 739 | struct iscsi_uevent *ev = NLMSG_DATA(nlh); |
| 740 | struct iscsi_stats *stats; |
| 741 | struct sk_buff *skbstat; |
| 742 | struct iscsi_if_conn *conn; |
| 743 | struct nlmsghdr *nlhstat; |
| 744 | struct iscsi_uevent *evstat; |
| 745 | int len = NLMSG_SPACE(sizeof(*ev) + |
| 746 | sizeof(struct iscsi_stats) + |
| 747 | sizeof(struct iscsi_stats_custom) * |
| 748 | ISCSI_STATS_CUSTOM_MAX); |
| 749 | int err = 0; |
| 750 | |
| 751 | conn = iscsi_if_find_conn(ev->u.get_stats.conn_handle); |
| 752 | if (!conn) |
| 753 | return -EEXIST; |
| 754 | |
| 755 | do { |
| 756 | int actual_size; |
| 757 | |
| 758 | mempool_zone_complete(&conn->z_pdu); |
| 759 | |
| 760 | skbstat = mempool_zone_get_skb(&conn->z_pdu); |
| 761 | if (!skbstat) { |
| 762 | printk(KERN_ERR "iscsi%d: can not deliver stats: OOM\n", |
| 763 | conn->host->host_no); |
| 764 | return -ENOMEM; |
| 765 | } |
| 766 | |
| 767 | nlhstat = __nlmsg_put(skbstat, daemon_pid, 0, 0, |
| 768 | (len - sizeof(*nlhstat)), 0); |
| 769 | evstat = NLMSG_DATA(nlhstat); |
| 770 | memset(evstat, 0, sizeof(*evstat)); |
| 771 | evstat->transport_handle = iscsi_handle(conn->transport); |
| 772 | evstat->type = nlh->nlmsg_type; |
| 773 | if (atomic_read(&conn->z_pdu.allocated) >= conn->z_pdu.hiwat) |
| 774 | evstat->iferror = -ENOMEM; |
| 775 | evstat->u.get_stats.conn_handle = |
| 776 | ev->u.get_stats.conn_handle; |
| 777 | stats = (struct iscsi_stats *) |
| 778 | ((char*)evstat + sizeof(*evstat)); |
| 779 | memset(stats, 0, sizeof(*stats)); |
| 780 | |
| 781 | transport->get_stats(ev->u.get_stats.conn_handle, stats); |
| 782 | actual_size = NLMSG_SPACE(sizeof(struct iscsi_uevent) + |
| 783 | sizeof(struct iscsi_stats) + |
| 784 | sizeof(struct iscsi_stats_custom) * |
| 785 | stats->custom_length); |
| 786 | actual_size -= sizeof(*nlhstat); |
| 787 | actual_size = NLMSG_LENGTH(actual_size); |
| 788 | skb_trim(skb, NLMSG_ALIGN(actual_size)); |
| 789 | nlhstat->nlmsg_len = actual_size; |
| 790 | |
| 791 | err = iscsi_unicast_skb(&conn->z_pdu, skbstat); |
| 792 | } while (err < 0 && err != -ECONNREFUSED); |
| 793 | |
| 794 | return err; |
| 795 | } |
| 796 | |
| 797 | static int |
| 798 | iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) |
| 799 | { |
| 800 | int err = 0; |
| 801 | struct iscsi_uevent *ev = NLMSG_DATA(nlh); |
| 802 | struct iscsi_transport *transport = NULL; |
| 803 | struct iscsi_internal *priv; |
| 804 | |
| 805 | if (NETLINK_CREDS(skb)->uid) |
| 806 | return -EPERM; |
| 807 | |
| 808 | priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle)); |
| 809 | if (!priv) |
| 810 | return -EINVAL; |
| 811 | transport = priv->iscsi_transport; |
| 812 | |
| 813 | daemon_pid = NETLINK_CREDS(skb)->pid; |
| 814 | |
| 815 | switch (nlh->nlmsg_type) { |
| 816 | case ISCSI_UEVENT_CREATE_SESSION: |
| 817 | err = iscsi_if_create_session(priv, ev); |
| 818 | break; |
| 819 | case ISCSI_UEVENT_DESTROY_SESSION: |
| 820 | err = iscsi_if_destroy_session(priv, ev); |
| 821 | break; |
| 822 | case ISCSI_UEVENT_CREATE_CONN: |
| 823 | err = iscsi_if_create_conn(transport, ev); |
| 824 | break; |
| 825 | case ISCSI_UEVENT_DESTROY_CONN: |
| 826 | err = iscsi_if_destroy_conn(transport, ev); |
| 827 | break; |
| 828 | case ISCSI_UEVENT_BIND_CONN: |
| 829 | if (!iscsi_if_find_conn(ev->u.b_conn.conn_handle)) |
| 830 | return -EEXIST; |
| 831 | ev->r.retcode = transport->bind_conn( |
| 832 | ev->u.b_conn.session_handle, |
| 833 | ev->u.b_conn.conn_handle, |
| 834 | ev->u.b_conn.transport_fd, |
| 835 | ev->u.b_conn.is_leading); |
| 836 | break; |
| 837 | case ISCSI_UEVENT_SET_PARAM: |
| 838 | if (!iscsi_if_find_conn(ev->u.set_param.conn_handle)) |
| 839 | return -EEXIST; |
| 840 | ev->r.retcode = transport->set_param( |
| 841 | ev->u.set_param.conn_handle, |
| 842 | ev->u.set_param.param, ev->u.set_param.value); |
| 843 | break; |
| 844 | case ISCSI_UEVENT_START_CONN: |
| 845 | if (!iscsi_if_find_conn(ev->u.start_conn.conn_handle)) |
| 846 | return -EEXIST; |
| 847 | ev->r.retcode = transport->start_conn( |
| 848 | ev->u.start_conn.conn_handle); |
| 849 | break; |
| 850 | case ISCSI_UEVENT_STOP_CONN: |
| 851 | if (!iscsi_if_find_conn(ev->u.stop_conn.conn_handle)) |
| 852 | return -EEXIST; |
| 853 | transport->stop_conn(ev->u.stop_conn.conn_handle, |
| 854 | ev->u.stop_conn.flag); |
| 855 | break; |
| 856 | case ISCSI_UEVENT_SEND_PDU: |
| 857 | if (!iscsi_if_find_conn(ev->u.send_pdu.conn_handle)) |
| 858 | return -EEXIST; |
| 859 | ev->r.retcode = transport->send_pdu( |
| 860 | ev->u.send_pdu.conn_handle, |
| 861 | (struct iscsi_hdr*)((char*)ev + sizeof(*ev)), |
| 862 | (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size, |
| 863 | ev->u.send_pdu.data_size); |
| 864 | break; |
| 865 | case ISCSI_UEVENT_GET_STATS: |
| 866 | err = iscsi_if_get_stats(transport, skb, nlh); |
| 867 | break; |
| 868 | default: |
| 869 | err = -EINVAL; |
| 870 | break; |
| 871 | } |
| 872 | |
| 873 | return err; |
| 874 | } |
| 875 | |
| 876 | /* Get message from skb (based on rtnetlink_rcv_skb). Each message is |
| 877 | * processed by iscsi_if_recv_msg. Malformed skbs with wrong length are |
| 878 | * discarded silently. */ |
| 879 | static void |
| 880 | iscsi_if_rx(struct sock *sk, int len) |
| 881 | { |
| 882 | struct sk_buff *skb; |
| 883 | |
| 884 | down(&rx_queue_sema); |
| 885 | while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { |
| 886 | while (skb->len >= NLMSG_SPACE(0)) { |
| 887 | int err; |
| 888 | uint32_t rlen; |
| 889 | struct nlmsghdr *nlh; |
| 890 | struct iscsi_uevent *ev; |
| 891 | |
| 892 | nlh = (struct nlmsghdr *)skb->data; |
| 893 | if (nlh->nlmsg_len < sizeof(*nlh) || |
| 894 | skb->len < nlh->nlmsg_len) { |
| 895 | break; |
| 896 | } |
| 897 | ev = NLMSG_DATA(nlh); |
| 898 | rlen = NLMSG_ALIGN(nlh->nlmsg_len); |
| 899 | if (rlen > skb->len) |
| 900 | rlen = skb->len; |
| 901 | err = iscsi_if_recv_msg(skb, nlh); |
| 902 | if (err) { |
| 903 | ev->type = ISCSI_KEVENT_IF_ERROR; |
| 904 | ev->iferror = err; |
| 905 | } |
| 906 | do { |
| 907 | /* |
| 908 | * special case for GET_STATS: |
| 909 | * on success - sending reply and stats from |
| 910 | * inside of if_recv_msg(), |
| 911 | * on error - fall through. |
| 912 | */ |
| 913 | if (ev->type == ISCSI_UEVENT_GET_STATS && !err) |
| 914 | break; |
| 915 | err = iscsi_if_send_reply( |
| 916 | NETLINK_CREDS(skb)->pid, nlh->nlmsg_seq, |
| 917 | nlh->nlmsg_type, 0, 0, ev, sizeof(*ev)); |
| 918 | if (atomic_read(&z_reply.allocated) >= |
| 919 | z_reply.hiwat) |
| 920 | ev->iferror = -ENOMEM; |
| 921 | } while (err < 0 && err != -ECONNREFUSED); |
| 922 | skb_pull(skb, rlen); |
| 923 | } |
| 924 | kfree_skb(skb); |
| 925 | } |
| 926 | up(&rx_queue_sema); |
| 927 | } |
| 928 | |
| 929 | /* |
| 930 | * iSCSI connection attrs |
| 931 | */ |
| 932 | #define iscsi_conn_int_attr_show(param, format) \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 933 | static ssize_t \ |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 934 | show_conn_int_param_##param(struct class_device *cdev, char *buf) \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 935 | { \ |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 936 | uint32_t value = 0; \ |
| 937 | struct iscsi_if_conn *conn = iscsi_cdev_to_if_conn(cdev); \ |
| 938 | struct iscsi_internal *priv; \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 939 | \ |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 940 | priv = to_iscsi_internal(conn->host->transportt); \ |
| 941 | if (priv->param_mask & (1 << param)) \ |
| 942 | priv->iscsi_transport->get_param(conn->connh, param, &value); \ |
| 943 | return snprintf(buf, 20, format"\n", value); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 944 | } |
| 945 | |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 946 | #define iscsi_conn_int_attr(field, param, format) \ |
| 947 | iscsi_conn_int_attr_show(param, format) \ |
| 948 | static CLASS_DEVICE_ATTR(field, S_IRUGO, show_conn_int_param_##param, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 949 | |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 950 | iscsi_conn_int_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH, "%u"); |
| 951 | iscsi_conn_int_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH, "%u"); |
| 952 | iscsi_conn_int_attr(header_digest, ISCSI_PARAM_HDRDGST_EN, "%d"); |
| 953 | iscsi_conn_int_attr(data_digest, ISCSI_PARAM_DATADGST_EN, "%d"); |
| 954 | iscsi_conn_int_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN, "%d"); |
| 955 | iscsi_conn_int_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN, "%d"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 956 | |
| 957 | /* |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 958 | * iSCSI session attrs |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 959 | */ |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 960 | #define iscsi_session_int_attr_show(param, format) \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 961 | static ssize_t \ |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 962 | show_session_int_param_##param(struct class_device *cdev, char *buf) \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 963 | { \ |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 964 | uint32_t value = 0; \ |
| 965 | struct iscsi_if_session *session = iscsi_cdev_to_if_session(cdev); \ |
| 966 | struct Scsi_Host *shost = iscsi_if_session_to_shost(session); \ |
| 967 | struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \ |
| 968 | struct iscsi_if_conn *conn = NULL; \ |
| 969 | unsigned long flags; \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 970 | \ |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 971 | spin_lock_irqsave(&connlock, flags); \ |
| 972 | if (!list_empty(&session->connections)) \ |
| 973 | conn = list_entry(session->connections.next, \ |
| 974 | struct iscsi_if_conn, session_list); \ |
| 975 | spin_unlock_irqrestore(&connlock, flags); \ |
| 976 | \ |
| 977 | if (conn && (priv->param_mask & (1 << param))) \ |
| 978 | priv->iscsi_transport->get_param(conn->connh, param, &value);\ |
| 979 | return snprintf(buf, 20, format"\n", value); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 980 | } |
| 981 | |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 982 | #define iscsi_session_int_attr(field, param, format) \ |
| 983 | iscsi_session_int_attr_show(param, format) \ |
| 984 | static CLASS_DEVICE_ATTR(field, S_IRUGO, show_session_int_param_##param, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 985 | |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 986 | iscsi_session_int_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, "%d"); |
| 987 | iscsi_session_int_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, "%hu"); |
| 988 | iscsi_session_int_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, "%d"); |
| 989 | iscsi_session_int_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, "%u"); |
| 990 | iscsi_session_int_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, "%u"); |
| 991 | iscsi_session_int_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, "%d"); |
| 992 | iscsi_session_int_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, "%d"); |
| 993 | iscsi_session_int_attr(erl, ISCSI_PARAM_ERL, "%d"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 994 | |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 995 | #define SETUP_SESSION_RD_ATTR(field, param) \ |
| 996 | if (priv->param_mask & (1 << param)) { \ |
| 997 | priv->session_attrs[count] = &class_device_attr_##field;\ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 998 | count++; \ |
| 999 | } |
| 1000 | |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 1001 | #define SETUP_CONN_RD_ATTR(field, param) \ |
| 1002 | if (priv->param_mask & (1 << param)) { \ |
| 1003 | priv->conn_attrs[count] = &class_device_attr_##field; \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1004 | count++; \ |
| 1005 | } |
| 1006 | |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 1007 | static int iscsi_is_session_dev(const struct device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1008 | { |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 1009 | return dev->release == iscsi_if_session_dev_release; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1010 | } |
| 1011 | |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 1012 | static int iscsi_session_match(struct attribute_container *cont, |
| 1013 | struct device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1014 | { |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 1015 | struct iscsi_if_session *session; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1016 | struct Scsi_Host *shost; |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 1017 | struct iscsi_internal *priv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1018 | |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 1019 | if (!iscsi_is_session_dev(dev)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1020 | return 0; |
| 1021 | |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 1022 | session = iscsi_dev_to_if_session(dev); |
| 1023 | shost = iscsi_if_session_to_shost(session); |
| 1024 | if (!shost->transportt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1025 | return 0; |
| 1026 | |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 1027 | priv = to_iscsi_internal(shost->transportt); |
| 1028 | if (priv->session_cont.ac.class != &iscsi_session_class.class) |
| 1029 | return 0; |
| 1030 | |
| 1031 | return &priv->session_cont.ac == cont; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1032 | } |
| 1033 | |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 1034 | static int iscsi_is_conn_dev(const struct device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1035 | { |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 1036 | return dev->release == iscsi_if_conn_dev_release; |
| 1037 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1038 | |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 1039 | static int iscsi_conn_match(struct attribute_container *cont, |
| 1040 | struct device *dev) |
| 1041 | { |
| 1042 | struct iscsi_if_conn *conn; |
| 1043 | struct Scsi_Host *shost; |
| 1044 | struct iscsi_internal *priv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1045 | |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 1046 | if (!iscsi_is_conn_dev(dev)) |
| 1047 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1048 | |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 1049 | conn = iscsi_dev_to_if_conn(dev); |
| 1050 | shost = conn->host; |
| 1051 | if (!shost->transportt) |
| 1052 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1053 | |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 1054 | priv = to_iscsi_internal(shost->transportt); |
| 1055 | if (priv->conn_cont.ac.class != &iscsi_connection_class.class) |
| 1056 | return 0; |
| 1057 | |
| 1058 | return &priv->conn_cont.ac == cont; |
| 1059 | } |
| 1060 | |
| 1061 | int iscsi_register_transport(struct iscsi_transport *tt) |
| 1062 | { |
| 1063 | struct iscsi_internal *priv; |
| 1064 | unsigned long flags; |
| 1065 | int count = 0, err; |
| 1066 | |
| 1067 | BUG_ON(!tt); |
| 1068 | |
| 1069 | priv = iscsi_if_transport_lookup(tt); |
| 1070 | if (priv) |
| 1071 | return -EEXIST; |
| 1072 | |
| 1073 | priv = kmalloc(sizeof(*priv), GFP_KERNEL); |
| 1074 | if (!priv) |
| 1075 | return -ENOMEM; |
| 1076 | memset(priv, 0, sizeof(*priv)); |
| 1077 | INIT_LIST_HEAD(&priv->list); |
| 1078 | INIT_LIST_HEAD(&priv->sessions); |
| 1079 | spin_lock_init(&priv->session_lock); |
| 1080 | priv->iscsi_transport = tt; |
| 1081 | |
| 1082 | priv->cdev.class = &iscsi_transport_class; |
| 1083 | snprintf(priv->cdev.class_id, BUS_ID_SIZE, "%s", tt->name); |
| 1084 | err = class_device_register(&priv->cdev); |
| 1085 | if (err) |
| 1086 | goto free_priv; |
| 1087 | |
| 1088 | err = sysfs_create_group(&priv->cdev.kobj, &iscsi_transport_group); |
| 1089 | if (err) |
| 1090 | goto unregister_cdev; |
| 1091 | |
| 1092 | /* setup parameters mask */ |
| 1093 | priv->param_mask = 0xFFFFFFFF; |
| 1094 | if (!(tt->caps & CAP_MULTI_R2T)) |
| 1095 | priv->param_mask &= ~(1 << ISCSI_PARAM_MAX_R2T); |
| 1096 | if (!(tt->caps & CAP_HDRDGST)) |
| 1097 | priv->param_mask &= ~(1 << ISCSI_PARAM_HDRDGST_EN); |
| 1098 | if (!(tt->caps & CAP_DATADGST)) |
| 1099 | priv->param_mask &= ~(1 << ISCSI_PARAM_DATADGST_EN); |
| 1100 | if (!(tt->caps & CAP_MARKERS)) { |
| 1101 | priv->param_mask &= ~(1 << ISCSI_PARAM_IFMARKER_EN); |
| 1102 | priv->param_mask &= ~(1 << ISCSI_PARAM_OFMARKER_EN); |
| 1103 | } |
| 1104 | |
| 1105 | /* connection parameters */ |
| 1106 | priv->conn_cont.ac.attrs = &priv->conn_attrs[0]; |
| 1107 | priv->conn_cont.ac.class = &iscsi_connection_class.class; |
| 1108 | priv->conn_cont.ac.match = iscsi_conn_match; |
| 1109 | transport_container_register(&priv->conn_cont); |
| 1110 | |
| 1111 | SETUP_CONN_RD_ATTR(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH); |
| 1112 | SETUP_CONN_RD_ATTR(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH); |
| 1113 | SETUP_CONN_RD_ATTR(header_digest, ISCSI_PARAM_HDRDGST_EN); |
| 1114 | SETUP_CONN_RD_ATTR(data_digest, ISCSI_PARAM_DATADGST_EN); |
| 1115 | SETUP_CONN_RD_ATTR(ifmarker, ISCSI_PARAM_IFMARKER_EN); |
| 1116 | SETUP_CONN_RD_ATTR(ofmarker, ISCSI_PARAM_OFMARKER_EN); |
| 1117 | |
| 1118 | BUG_ON(count > ISCSI_CONN_ATTRS); |
| 1119 | priv->conn_attrs[count] = NULL; |
| 1120 | count = 0; |
| 1121 | |
| 1122 | /* session parameters */ |
| 1123 | priv->session_cont.ac.attrs = &priv->session_attrs[0]; |
| 1124 | priv->session_cont.ac.class = &iscsi_session_class.class; |
| 1125 | priv->session_cont.ac.match = iscsi_session_match; |
| 1126 | transport_container_register(&priv->session_cont); |
| 1127 | |
| 1128 | SETUP_SESSION_RD_ATTR(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN); |
| 1129 | SETUP_SESSION_RD_ATTR(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T); |
| 1130 | SETUP_SESSION_RD_ATTR(immediate_data, ISCSI_PARAM_IMM_DATA_EN); |
| 1131 | SETUP_SESSION_RD_ATTR(first_burst_len, ISCSI_PARAM_FIRST_BURST); |
| 1132 | SETUP_SESSION_RD_ATTR(max_burst_len, ISCSI_PARAM_MAX_BURST); |
| 1133 | SETUP_SESSION_RD_ATTR(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN); |
| 1134 | SETUP_SESSION_RD_ATTR(data_seq_in_order,ISCSI_PARAM_DATASEQ_INORDER_EN) |
| 1135 | SETUP_SESSION_RD_ATTR(erl, ISCSI_PARAM_ERL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1136 | |
| 1137 | BUG_ON(count > ISCSI_SESSION_ATTRS); |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 1138 | priv->session_attrs[count] = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1139 | |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 1140 | spin_lock_irqsave(&iscsi_transport_lock, flags); |
| 1141 | list_add(&priv->list, &iscsi_transports); |
| 1142 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1143 | |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 1144 | printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name); |
| 1145 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1146 | |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 1147 | unregister_cdev: |
| 1148 | class_device_unregister(&priv->cdev); |
| 1149 | free_priv: |
| 1150 | kfree(priv); |
| 1151 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1152 | } |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 1153 | EXPORT_SYMBOL_GPL(iscsi_register_transport); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1154 | |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 1155 | int iscsi_unregister_transport(struct iscsi_transport *tt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1156 | { |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 1157 | struct iscsi_internal *priv; |
| 1158 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1159 | |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 1160 | BUG_ON(!tt); |
| 1161 | |
| 1162 | down(&rx_queue_sema); |
| 1163 | |
| 1164 | priv = iscsi_if_transport_lookup(tt); |
| 1165 | BUG_ON (!priv); |
| 1166 | |
| 1167 | spin_lock_irqsave(&priv->session_lock, flags); |
| 1168 | if (!list_empty(&priv->sessions)) { |
| 1169 | spin_unlock_irqrestore(&priv->session_lock, flags); |
| 1170 | up(&rx_queue_sema); |
| 1171 | return -EPERM; |
| 1172 | } |
| 1173 | spin_unlock_irqrestore(&priv->session_lock, flags); |
| 1174 | |
| 1175 | spin_lock_irqsave(&iscsi_transport_lock, flags); |
| 1176 | list_del(&priv->list); |
| 1177 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); |
| 1178 | |
| 1179 | transport_container_unregister(&priv->conn_cont); |
| 1180 | transport_container_unregister(&priv->session_cont); |
| 1181 | |
| 1182 | sysfs_remove_group(&priv->cdev.kobj, &iscsi_transport_group); |
| 1183 | class_device_unregister(&priv->cdev); |
| 1184 | up(&rx_queue_sema); |
| 1185 | |
| 1186 | return 0; |
| 1187 | } |
| 1188 | EXPORT_SYMBOL_GPL(iscsi_unregister_transport); |
| 1189 | |
| 1190 | static int |
| 1191 | iscsi_rcv_nl_event(struct notifier_block *this, unsigned long event, void *ptr) |
| 1192 | { |
| 1193 | struct netlink_notify *n = ptr; |
| 1194 | |
| 1195 | if (event == NETLINK_URELEASE && |
| 1196 | n->protocol == NETLINK_ISCSI && n->pid) { |
| 1197 | struct iscsi_if_conn *conn; |
| 1198 | unsigned long flags; |
| 1199 | |
| 1200 | mempool_zone_complete(&z_reply); |
| 1201 | spin_lock_irqsave(&connlock, flags); |
| 1202 | list_for_each_entry(conn, &connlist, conn_list) { |
| 1203 | mempool_zone_complete(&conn->z_error); |
| 1204 | mempool_zone_complete(&conn->z_pdu); |
| 1205 | } |
| 1206 | spin_unlock_irqrestore(&connlock, flags); |
| 1207 | } |
| 1208 | |
| 1209 | return NOTIFY_DONE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1210 | } |
| 1211 | |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 1212 | static struct notifier_block iscsi_nl_notifier = { |
| 1213 | .notifier_call = iscsi_rcv_nl_event, |
| 1214 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1215 | |
| 1216 | static __init int iscsi_transport_init(void) |
| 1217 | { |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 1218 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1219 | |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 1220 | err = class_register(&iscsi_transport_class); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1221 | if (err) |
| 1222 | return err; |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 1223 | |
| 1224 | err = transport_class_register(&iscsi_connection_class); |
| 1225 | if (err) |
| 1226 | goto unregister_transport_class; |
| 1227 | |
| 1228 | err = transport_class_register(&iscsi_session_class); |
| 1229 | if (err) |
| 1230 | goto unregister_conn_class; |
| 1231 | |
| 1232 | err = netlink_register_notifier(&iscsi_nl_notifier); |
| 1233 | if (err) |
| 1234 | goto unregister_session_class; |
| 1235 | |
James Bottomley | 2290d2b | 2005-09-08 10:14:11 -0500 | [diff] [blame] | 1236 | nls = netlink_kernel_create(NETLINK_ISCSI, 1, iscsi_if_rx, |
| 1237 | THIS_MODULE); |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 1238 | if (!nls) { |
| 1239 | err = -ENOBUFS; |
| 1240 | goto unregister_notifier; |
| 1241 | } |
| 1242 | |
| 1243 | err = mempool_zone_init(&z_reply, Z_MAX_REPLY, |
| 1244 | NLMSG_SPACE(sizeof(struct iscsi_uevent)), Z_HIWAT_REPLY); |
| 1245 | if (!err) |
| 1246 | return 0; |
| 1247 | |
| 1248 | sock_release(nls->sk_socket); |
| 1249 | unregister_notifier: |
| 1250 | netlink_unregister_notifier(&iscsi_nl_notifier); |
| 1251 | unregister_session_class: |
| 1252 | transport_class_unregister(&iscsi_session_class); |
| 1253 | unregister_conn_class: |
| 1254 | transport_class_unregister(&iscsi_connection_class); |
| 1255 | unregister_transport_class: |
| 1256 | class_unregister(&iscsi_transport_class); |
| 1257 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1258 | } |
| 1259 | |
| 1260 | static void __exit iscsi_transport_exit(void) |
| 1261 | { |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 1262 | mempool_destroy(z_reply.pool); |
| 1263 | sock_release(nls->sk_socket); |
| 1264 | netlink_unregister_notifier(&iscsi_nl_notifier); |
| 1265 | transport_class_unregister(&iscsi_connection_class); |
| 1266 | transport_class_unregister(&iscsi_session_class); |
| 1267 | class_unregister(&iscsi_transport_class); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1268 | } |
| 1269 | |
| 1270 | module_init(iscsi_transport_init); |
| 1271 | module_exit(iscsi_transport_exit); |
| 1272 | |
Alex Aizman | 0896b75 | 2005-08-04 19:33:07 -0700 | [diff] [blame] | 1273 | MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, " |
| 1274 | "Dmitry Yusupov <dmitry_yus@yahoo.com>, " |
| 1275 | "Alex Aizman <itn780@yahoo.com>"); |
| 1276 | MODULE_DESCRIPTION("iSCSI Transport Interface"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1277 | MODULE_LICENSE("GPL"); |