| 1 | /* |
| 2 | * zfcp device driver |
| 3 | * |
| 4 | * Fibre Channel related functions for the zfcp device driver. |
| 5 | * |
| 6 | * Copyright IBM Corporation 2008, 2010 |
| 7 | */ |
| 8 | |
| 9 | #define KMSG_COMPONENT "zfcp" |
| 10 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt |
| 11 | |
| 12 | #include <linux/types.h> |
| 13 | #include <linux/slab.h> |
| 14 | #include <scsi/fc/fc_els.h> |
| 15 | #include <scsi/libfc.h> |
| 16 | #include "zfcp_ext.h" |
| 17 | #include "zfcp_fc.h" |
| 18 | |
| 19 | struct kmem_cache *zfcp_fc_req_cache; |
| 20 | |
| 21 | static u32 zfcp_fc_rscn_range_mask[] = { |
| 22 | [ELS_ADDR_FMT_PORT] = 0xFFFFFF, |
| 23 | [ELS_ADDR_FMT_AREA] = 0xFFFF00, |
| 24 | [ELS_ADDR_FMT_DOM] = 0xFF0000, |
| 25 | [ELS_ADDR_FMT_FAB] = 0x000000, |
| 26 | }; |
| 27 | |
| 28 | /** |
| 29 | * zfcp_fc_post_event - post event to userspace via fc_transport |
| 30 | * @work: work struct with enqueued events |
| 31 | */ |
| 32 | void zfcp_fc_post_event(struct work_struct *work) |
| 33 | { |
| 34 | struct zfcp_fc_event *event = NULL, *tmp = NULL; |
| 35 | LIST_HEAD(tmp_lh); |
| 36 | struct zfcp_fc_events *events = container_of(work, |
| 37 | struct zfcp_fc_events, work); |
| 38 | struct zfcp_adapter *adapter = container_of(events, struct zfcp_adapter, |
| 39 | events); |
| 40 | |
| 41 | spin_lock_bh(&events->list_lock); |
| 42 | list_splice_init(&events->list, &tmp_lh); |
| 43 | spin_unlock_bh(&events->list_lock); |
| 44 | |
| 45 | list_for_each_entry_safe(event, tmp, &tmp_lh, list) { |
| 46 | fc_host_post_event(adapter->scsi_host, fc_get_event_number(), |
| 47 | event->code, event->data); |
| 48 | list_del(&event->list); |
| 49 | kfree(event); |
| 50 | } |
| 51 | |
| 52 | } |
| 53 | |
| 54 | /** |
| 55 | * zfcp_fc_enqueue_event - safely enqueue FC HBA API event from irq context |
| 56 | * @adapter: The adapter where to enqueue the event |
| 57 | * @event_code: The event code (as defined in fc_host_event_code in |
| 58 | * scsi_transport_fc.h) |
| 59 | * @event_data: The event data (e.g. n_port page in case of els) |
| 60 | */ |
| 61 | void zfcp_fc_enqueue_event(struct zfcp_adapter *adapter, |
| 62 | enum fc_host_event_code event_code, u32 event_data) |
| 63 | { |
| 64 | struct zfcp_fc_event *event; |
| 65 | |
| 66 | event = kmalloc(sizeof(struct zfcp_fc_event), GFP_ATOMIC); |
| 67 | if (!event) |
| 68 | return; |
| 69 | |
| 70 | event->code = event_code; |
| 71 | event->data = event_data; |
| 72 | |
| 73 | spin_lock(&adapter->events.list_lock); |
| 74 | list_add_tail(&event->list, &adapter->events.list); |
| 75 | spin_unlock(&adapter->events.list_lock); |
| 76 | |
| 77 | queue_work(adapter->work_queue, &adapter->events.work); |
| 78 | } |
| 79 | |
| 80 | static int zfcp_fc_wka_port_get(struct zfcp_fc_wka_port *wka_port) |
| 81 | { |
| 82 | if (mutex_lock_interruptible(&wka_port->mutex)) |
| 83 | return -ERESTARTSYS; |
| 84 | |
| 85 | if (wka_port->status == ZFCP_FC_WKA_PORT_OFFLINE || |
| 86 | wka_port->status == ZFCP_FC_WKA_PORT_CLOSING) { |
| 87 | wka_port->status = ZFCP_FC_WKA_PORT_OPENING; |
| 88 | if (zfcp_fsf_open_wka_port(wka_port)) |
| 89 | wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE; |
| 90 | } |
| 91 | |
| 92 | mutex_unlock(&wka_port->mutex); |
| 93 | |
| 94 | wait_event(wka_port->completion_wq, |
| 95 | wka_port->status == ZFCP_FC_WKA_PORT_ONLINE || |
| 96 | wka_port->status == ZFCP_FC_WKA_PORT_OFFLINE); |
| 97 | |
| 98 | if (wka_port->status == ZFCP_FC_WKA_PORT_ONLINE) { |
| 99 | atomic_inc(&wka_port->refcount); |
| 100 | return 0; |
| 101 | } |
| 102 | return -EIO; |
| 103 | } |
| 104 | |
| 105 | static void zfcp_fc_wka_port_offline(struct work_struct *work) |
| 106 | { |
| 107 | struct delayed_work *dw = to_delayed_work(work); |
| 108 | struct zfcp_fc_wka_port *wka_port = |
| 109 | container_of(dw, struct zfcp_fc_wka_port, work); |
| 110 | |
| 111 | mutex_lock(&wka_port->mutex); |
| 112 | if ((atomic_read(&wka_port->refcount) != 0) || |
| 113 | (wka_port->status != ZFCP_FC_WKA_PORT_ONLINE)) |
| 114 | goto out; |
| 115 | |
| 116 | wka_port->status = ZFCP_FC_WKA_PORT_CLOSING; |
| 117 | if (zfcp_fsf_close_wka_port(wka_port)) { |
| 118 | wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE; |
| 119 | wake_up(&wka_port->completion_wq); |
| 120 | } |
| 121 | out: |
| 122 | mutex_unlock(&wka_port->mutex); |
| 123 | } |
| 124 | |
| 125 | static void zfcp_fc_wka_port_put(struct zfcp_fc_wka_port *wka_port) |
| 126 | { |
| 127 | if (atomic_dec_return(&wka_port->refcount) != 0) |
| 128 | return; |
| 129 | /* wait 10 milliseconds, other reqs might pop in */ |
| 130 | schedule_delayed_work(&wka_port->work, HZ / 100); |
| 131 | } |
| 132 | |
| 133 | static void zfcp_fc_wka_port_init(struct zfcp_fc_wka_port *wka_port, u32 d_id, |
| 134 | struct zfcp_adapter *adapter) |
| 135 | { |
| 136 | init_waitqueue_head(&wka_port->completion_wq); |
| 137 | |
| 138 | wka_port->adapter = adapter; |
| 139 | wka_port->d_id = d_id; |
| 140 | |
| 141 | wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE; |
| 142 | atomic_set(&wka_port->refcount, 0); |
| 143 | mutex_init(&wka_port->mutex); |
| 144 | INIT_DELAYED_WORK(&wka_port->work, zfcp_fc_wka_port_offline); |
| 145 | } |
| 146 | |
| 147 | static void zfcp_fc_wka_port_force_offline(struct zfcp_fc_wka_port *wka) |
| 148 | { |
| 149 | cancel_delayed_work_sync(&wka->work); |
| 150 | mutex_lock(&wka->mutex); |
| 151 | wka->status = ZFCP_FC_WKA_PORT_OFFLINE; |
| 152 | mutex_unlock(&wka->mutex); |
| 153 | } |
| 154 | |
| 155 | void zfcp_fc_wka_ports_force_offline(struct zfcp_fc_wka_ports *gs) |
| 156 | { |
| 157 | if (!gs) |
| 158 | return; |
| 159 | zfcp_fc_wka_port_force_offline(&gs->ms); |
| 160 | zfcp_fc_wka_port_force_offline(&gs->ts); |
| 161 | zfcp_fc_wka_port_force_offline(&gs->ds); |
| 162 | zfcp_fc_wka_port_force_offline(&gs->as); |
| 163 | } |
| 164 | |
| 165 | static void _zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req, u32 range, |
| 166 | struct fc_els_rscn_page *page) |
| 167 | { |
| 168 | unsigned long flags; |
| 169 | struct zfcp_adapter *adapter = fsf_req->adapter; |
| 170 | struct zfcp_port *port; |
| 171 | |
| 172 | read_lock_irqsave(&adapter->port_list_lock, flags); |
| 173 | list_for_each_entry(port, &adapter->port_list, list) { |
| 174 | if ((port->d_id & range) == (ntoh24(page->rscn_fid) & range)) |
| 175 | zfcp_fc_test_link(port); |
| 176 | if (!port->d_id) |
| 177 | zfcp_erp_port_reopen(port, |
| 178 | ZFCP_STATUS_COMMON_ERP_FAILED, |
| 179 | "fcrscn1"); |
| 180 | } |
| 181 | read_unlock_irqrestore(&adapter->port_list_lock, flags); |
| 182 | } |
| 183 | |
| 184 | static void zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req) |
| 185 | { |
| 186 | struct fsf_status_read_buffer *status_buffer = (void *)fsf_req->data; |
| 187 | struct fc_els_rscn *head; |
| 188 | struct fc_els_rscn_page *page; |
| 189 | u16 i; |
| 190 | u16 no_entries; |
| 191 | unsigned int afmt; |
| 192 | |
| 193 | head = (struct fc_els_rscn *) status_buffer->payload.data; |
| 194 | page = (struct fc_els_rscn_page *) head; |
| 195 | |
| 196 | /* see FC-FS */ |
| 197 | no_entries = head->rscn_plen / sizeof(struct fc_els_rscn_page); |
| 198 | |
| 199 | for (i = 1; i < no_entries; i++) { |
| 200 | /* skip head and start with 1st element */ |
| 201 | page++; |
| 202 | afmt = page->rscn_page_flags & ELS_RSCN_ADDR_FMT_MASK; |
| 203 | _zfcp_fc_incoming_rscn(fsf_req, zfcp_fc_rscn_range_mask[afmt], |
| 204 | page); |
| 205 | zfcp_fc_enqueue_event(fsf_req->adapter, FCH_EVT_RSCN, |
| 206 | *(u32 *)page); |
| 207 | } |
| 208 | queue_work(fsf_req->adapter->work_queue, &fsf_req->adapter->scan_work); |
| 209 | } |
| 210 | |
| 211 | static void zfcp_fc_incoming_wwpn(struct zfcp_fsf_req *req, u64 wwpn) |
| 212 | { |
| 213 | unsigned long flags; |
| 214 | struct zfcp_adapter *adapter = req->adapter; |
| 215 | struct zfcp_port *port; |
| 216 | |
| 217 | read_lock_irqsave(&adapter->port_list_lock, flags); |
| 218 | list_for_each_entry(port, &adapter->port_list, list) |
| 219 | if (port->wwpn == wwpn) { |
| 220 | zfcp_erp_port_forced_reopen(port, 0, "fciwwp1"); |
| 221 | break; |
| 222 | } |
| 223 | read_unlock_irqrestore(&adapter->port_list_lock, flags); |
| 224 | } |
| 225 | |
| 226 | static void zfcp_fc_incoming_plogi(struct zfcp_fsf_req *req) |
| 227 | { |
| 228 | struct fsf_status_read_buffer *status_buffer; |
| 229 | struct fc_els_flogi *plogi; |
| 230 | |
| 231 | status_buffer = (struct fsf_status_read_buffer *) req->data; |
| 232 | plogi = (struct fc_els_flogi *) status_buffer->payload.data; |
| 233 | zfcp_fc_incoming_wwpn(req, plogi->fl_wwpn); |
| 234 | } |
| 235 | |
| 236 | static void zfcp_fc_incoming_logo(struct zfcp_fsf_req *req) |
| 237 | { |
| 238 | struct fsf_status_read_buffer *status_buffer = |
| 239 | (struct fsf_status_read_buffer *)req->data; |
| 240 | struct fc_els_logo *logo = |
| 241 | (struct fc_els_logo *) status_buffer->payload.data; |
| 242 | |
| 243 | zfcp_fc_incoming_wwpn(req, logo->fl_n_port_wwn); |
| 244 | } |
| 245 | |
| 246 | /** |
| 247 | * zfcp_fc_incoming_els - handle incoming ELS |
| 248 | * @fsf_req - request which contains incoming ELS |
| 249 | */ |
| 250 | void zfcp_fc_incoming_els(struct zfcp_fsf_req *fsf_req) |
| 251 | { |
| 252 | struct fsf_status_read_buffer *status_buffer = |
| 253 | (struct fsf_status_read_buffer *) fsf_req->data; |
| 254 | unsigned int els_type = status_buffer->payload.data[0]; |
| 255 | |
| 256 | zfcp_dbf_san_in_els("fciels1", fsf_req); |
| 257 | if (els_type == ELS_PLOGI) |
| 258 | zfcp_fc_incoming_plogi(fsf_req); |
| 259 | else if (els_type == ELS_LOGO) |
| 260 | zfcp_fc_incoming_logo(fsf_req); |
| 261 | else if (els_type == ELS_RSCN) |
| 262 | zfcp_fc_incoming_rscn(fsf_req); |
| 263 | } |
| 264 | |
| 265 | static void zfcp_fc_ns_gid_pn_eval(struct zfcp_fc_req *fc_req) |
| 266 | { |
| 267 | struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els; |
| 268 | struct zfcp_fc_gid_pn_rsp *gid_pn_rsp = &fc_req->u.gid_pn.rsp; |
| 269 | |
| 270 | if (ct_els->status) |
| 271 | return; |
| 272 | if (gid_pn_rsp->ct_hdr.ct_cmd != FC_FS_ACC) |
| 273 | return; |
| 274 | |
| 275 | /* looks like a valid d_id */ |
| 276 | ct_els->port->d_id = ntoh24(gid_pn_rsp->gid_pn.fp_fid); |
| 277 | } |
| 278 | |
| 279 | static void zfcp_fc_complete(void *data) |
| 280 | { |
| 281 | complete(data); |
| 282 | } |
| 283 | |
| 284 | static void zfcp_fc_ct_ns_init(struct fc_ct_hdr *ct_hdr, u16 cmd, u16 mr_size) |
| 285 | { |
| 286 | ct_hdr->ct_rev = FC_CT_REV; |
| 287 | ct_hdr->ct_fs_type = FC_FST_DIR; |
| 288 | ct_hdr->ct_fs_subtype = FC_NS_SUBTYPE; |
| 289 | ct_hdr->ct_cmd = cmd; |
| 290 | ct_hdr->ct_mr_size = mr_size / 4; |
| 291 | } |
| 292 | |
| 293 | static int zfcp_fc_ns_gid_pn_request(struct zfcp_port *port, |
| 294 | struct zfcp_fc_req *fc_req) |
| 295 | { |
| 296 | struct zfcp_adapter *adapter = port->adapter; |
| 297 | DECLARE_COMPLETION_ONSTACK(completion); |
| 298 | struct zfcp_fc_gid_pn_req *gid_pn_req = &fc_req->u.gid_pn.req; |
| 299 | struct zfcp_fc_gid_pn_rsp *gid_pn_rsp = &fc_req->u.gid_pn.rsp; |
| 300 | int ret; |
| 301 | |
| 302 | /* setup parameters for send generic command */ |
| 303 | fc_req->ct_els.port = port; |
| 304 | fc_req->ct_els.handler = zfcp_fc_complete; |
| 305 | fc_req->ct_els.handler_data = &completion; |
| 306 | fc_req->ct_els.req = &fc_req->sg_req; |
| 307 | fc_req->ct_els.resp = &fc_req->sg_rsp; |
| 308 | sg_init_one(&fc_req->sg_req, gid_pn_req, sizeof(*gid_pn_req)); |
| 309 | sg_init_one(&fc_req->sg_rsp, gid_pn_rsp, sizeof(*gid_pn_rsp)); |
| 310 | |
| 311 | zfcp_fc_ct_ns_init(&gid_pn_req->ct_hdr, |
| 312 | FC_NS_GID_PN, ZFCP_FC_CT_SIZE_PAGE); |
| 313 | gid_pn_req->gid_pn.fn_wwpn = port->wwpn; |
| 314 | |
| 315 | ret = zfcp_fsf_send_ct(&adapter->gs->ds, &fc_req->ct_els, |
| 316 | adapter->pool.gid_pn_req, |
| 317 | ZFCP_FC_CTELS_TMO); |
| 318 | if (!ret) { |
| 319 | wait_for_completion(&completion); |
| 320 | zfcp_fc_ns_gid_pn_eval(fc_req); |
| 321 | } |
| 322 | return ret; |
| 323 | } |
| 324 | |
| 325 | /** |
| 326 | * zfcp_fc_ns_gid_pn - initiate GID_PN nameserver request |
| 327 | * @port: port where GID_PN request is needed |
| 328 | * return: -ENOMEM on error, 0 otherwise |
| 329 | */ |
| 330 | static int zfcp_fc_ns_gid_pn(struct zfcp_port *port) |
| 331 | { |
| 332 | int ret; |
| 333 | struct zfcp_fc_req *fc_req; |
| 334 | struct zfcp_adapter *adapter = port->adapter; |
| 335 | |
| 336 | fc_req = mempool_alloc(adapter->pool.gid_pn, GFP_ATOMIC); |
| 337 | if (!fc_req) |
| 338 | return -ENOMEM; |
| 339 | |
| 340 | memset(fc_req, 0, sizeof(*fc_req)); |
| 341 | |
| 342 | ret = zfcp_fc_wka_port_get(&adapter->gs->ds); |
| 343 | if (ret) |
| 344 | goto out; |
| 345 | |
| 346 | ret = zfcp_fc_ns_gid_pn_request(port, fc_req); |
| 347 | |
| 348 | zfcp_fc_wka_port_put(&adapter->gs->ds); |
| 349 | out: |
| 350 | mempool_free(fc_req, adapter->pool.gid_pn); |
| 351 | return ret; |
| 352 | } |
| 353 | |
| 354 | void zfcp_fc_port_did_lookup(struct work_struct *work) |
| 355 | { |
| 356 | int ret; |
| 357 | struct zfcp_port *port = container_of(work, struct zfcp_port, |
| 358 | gid_pn_work); |
| 359 | |
| 360 | ret = zfcp_fc_ns_gid_pn(port); |
| 361 | if (ret) { |
| 362 | /* could not issue gid_pn for some reason */ |
| 363 | zfcp_erp_adapter_reopen(port->adapter, 0, "fcgpn_1"); |
| 364 | goto out; |
| 365 | } |
| 366 | |
| 367 | if (!port->d_id) { |
| 368 | zfcp_erp_set_port_status(port, ZFCP_STATUS_COMMON_ERP_FAILED); |
| 369 | goto out; |
| 370 | } |
| 371 | |
| 372 | zfcp_erp_port_reopen(port, 0, "fcgpn_3"); |
| 373 | out: |
| 374 | put_device(&port->dev); |
| 375 | } |
| 376 | |
| 377 | /** |
| 378 | * zfcp_fc_trigger_did_lookup - trigger the d_id lookup using a GID_PN request |
| 379 | * @port: The zfcp_port to lookup the d_id for. |
| 380 | */ |
| 381 | void zfcp_fc_trigger_did_lookup(struct zfcp_port *port) |
| 382 | { |
| 383 | get_device(&port->dev); |
| 384 | if (!queue_work(port->adapter->work_queue, &port->gid_pn_work)) |
| 385 | put_device(&port->dev); |
| 386 | } |
| 387 | |
| 388 | /** |
| 389 | * zfcp_fc_plogi_evaluate - evaluate PLOGI playload |
| 390 | * @port: zfcp_port structure |
| 391 | * @plogi: plogi payload |
| 392 | * |
| 393 | * Evaluate PLOGI playload and copy important fields into zfcp_port structure |
| 394 | */ |
| 395 | void zfcp_fc_plogi_evaluate(struct zfcp_port *port, struct fc_els_flogi *plogi) |
| 396 | { |
| 397 | if (plogi->fl_wwpn != port->wwpn) { |
| 398 | port->d_id = 0; |
| 399 | dev_warn(&port->adapter->ccw_device->dev, |
| 400 | "A port opened with WWPN 0x%016Lx returned data that " |
| 401 | "identifies it as WWPN 0x%016Lx\n", |
| 402 | (unsigned long long) port->wwpn, |
| 403 | (unsigned long long) plogi->fl_wwpn); |
| 404 | return; |
| 405 | } |
| 406 | |
| 407 | port->wwnn = plogi->fl_wwnn; |
| 408 | port->maxframe_size = plogi->fl_csp.sp_bb_data; |
| 409 | |
| 410 | if (plogi->fl_cssp[0].cp_class & FC_CPC_VALID) |
| 411 | port->supported_classes |= FC_COS_CLASS1; |
| 412 | if (plogi->fl_cssp[1].cp_class & FC_CPC_VALID) |
| 413 | port->supported_classes |= FC_COS_CLASS2; |
| 414 | if (plogi->fl_cssp[2].cp_class & FC_CPC_VALID) |
| 415 | port->supported_classes |= FC_COS_CLASS3; |
| 416 | if (plogi->fl_cssp[3].cp_class & FC_CPC_VALID) |
| 417 | port->supported_classes |= FC_COS_CLASS4; |
| 418 | } |
| 419 | |
| 420 | static void zfcp_fc_adisc_handler(void *data) |
| 421 | { |
| 422 | struct zfcp_fc_req *fc_req = data; |
| 423 | struct zfcp_port *port = fc_req->ct_els.port; |
| 424 | struct fc_els_adisc *adisc_resp = &fc_req->u.adisc.rsp; |
| 425 | |
| 426 | if (fc_req->ct_els.status) { |
| 427 | /* request rejected or timed out */ |
| 428 | zfcp_erp_port_forced_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED, |
| 429 | "fcadh_1"); |
| 430 | goto out; |
| 431 | } |
| 432 | |
| 433 | if (!port->wwnn) |
| 434 | port->wwnn = adisc_resp->adisc_wwnn; |
| 435 | |
| 436 | if ((port->wwpn != adisc_resp->adisc_wwpn) || |
| 437 | !(atomic_read(&port->status) & ZFCP_STATUS_COMMON_OPEN)) { |
| 438 | zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED, |
| 439 | "fcadh_2"); |
| 440 | goto out; |
| 441 | } |
| 442 | |
| 443 | /* port is good, unblock rport without going through erp */ |
| 444 | zfcp_scsi_schedule_rport_register(port); |
| 445 | out: |
| 446 | atomic_clear_mask(ZFCP_STATUS_PORT_LINK_TEST, &port->status); |
| 447 | put_device(&port->dev); |
| 448 | kmem_cache_free(zfcp_fc_req_cache, fc_req); |
| 449 | } |
| 450 | |
| 451 | static int zfcp_fc_adisc(struct zfcp_port *port) |
| 452 | { |
| 453 | struct zfcp_fc_req *fc_req; |
| 454 | struct zfcp_adapter *adapter = port->adapter; |
| 455 | struct Scsi_Host *shost = adapter->scsi_host; |
| 456 | int ret; |
| 457 | |
| 458 | fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_ATOMIC); |
| 459 | if (!fc_req) |
| 460 | return -ENOMEM; |
| 461 | |
| 462 | fc_req->ct_els.port = port; |
| 463 | fc_req->ct_els.req = &fc_req->sg_req; |
| 464 | fc_req->ct_els.resp = &fc_req->sg_rsp; |
| 465 | sg_init_one(&fc_req->sg_req, &fc_req->u.adisc.req, |
| 466 | sizeof(struct fc_els_adisc)); |
| 467 | sg_init_one(&fc_req->sg_rsp, &fc_req->u.adisc.rsp, |
| 468 | sizeof(struct fc_els_adisc)); |
| 469 | |
| 470 | fc_req->ct_els.handler = zfcp_fc_adisc_handler; |
| 471 | fc_req->ct_els.handler_data = fc_req; |
| 472 | |
| 473 | /* acc. to FC-FS, hard_nport_id in ADISC should not be set for ports |
| 474 | without FC-AL-2 capability, so we don't set it */ |
| 475 | fc_req->u.adisc.req.adisc_wwpn = fc_host_port_name(shost); |
| 476 | fc_req->u.adisc.req.adisc_wwnn = fc_host_node_name(shost); |
| 477 | fc_req->u.adisc.req.adisc_cmd = ELS_ADISC; |
| 478 | hton24(fc_req->u.adisc.req.adisc_port_id, fc_host_port_id(shost)); |
| 479 | |
| 480 | ret = zfcp_fsf_send_els(adapter, port->d_id, &fc_req->ct_els, |
| 481 | ZFCP_FC_CTELS_TMO); |
| 482 | if (ret) |
| 483 | kmem_cache_free(zfcp_fc_req_cache, fc_req); |
| 484 | |
| 485 | return ret; |
| 486 | } |
| 487 | |
| 488 | void zfcp_fc_link_test_work(struct work_struct *work) |
| 489 | { |
| 490 | struct zfcp_port *port = |
| 491 | container_of(work, struct zfcp_port, test_link_work); |
| 492 | int retval; |
| 493 | |
| 494 | get_device(&port->dev); |
| 495 | port->rport_task = RPORT_DEL; |
| 496 | zfcp_scsi_rport_work(&port->rport_work); |
| 497 | |
| 498 | /* only issue one test command at one time per port */ |
| 499 | if (atomic_read(&port->status) & ZFCP_STATUS_PORT_LINK_TEST) |
| 500 | goto out; |
| 501 | |
| 502 | atomic_set_mask(ZFCP_STATUS_PORT_LINK_TEST, &port->status); |
| 503 | |
| 504 | retval = zfcp_fc_adisc(port); |
| 505 | if (retval == 0) |
| 506 | return; |
| 507 | |
| 508 | /* send of ADISC was not possible */ |
| 509 | atomic_clear_mask(ZFCP_STATUS_PORT_LINK_TEST, &port->status); |
| 510 | zfcp_erp_port_forced_reopen(port, 0, "fcltwk1"); |
| 511 | |
| 512 | out: |
| 513 | put_device(&port->dev); |
| 514 | } |
| 515 | |
| 516 | /** |
| 517 | * zfcp_fc_test_link - lightweight link test procedure |
| 518 | * @port: port to be tested |
| 519 | * |
| 520 | * Test status of a link to a remote port using the ELS command ADISC. |
| 521 | * If there is a problem with the remote port, error recovery steps |
| 522 | * will be triggered. |
| 523 | */ |
| 524 | void zfcp_fc_test_link(struct zfcp_port *port) |
| 525 | { |
| 526 | get_device(&port->dev); |
| 527 | if (!queue_work(port->adapter->work_queue, &port->test_link_work)) |
| 528 | put_device(&port->dev); |
| 529 | } |
| 530 | |
| 531 | static struct zfcp_fc_req *zfcp_alloc_sg_env(int buf_num) |
| 532 | { |
| 533 | struct zfcp_fc_req *fc_req; |
| 534 | |
| 535 | fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_KERNEL); |
| 536 | if (!fc_req) |
| 537 | return NULL; |
| 538 | |
| 539 | if (zfcp_sg_setup_table(&fc_req->sg_rsp, buf_num)) { |
| 540 | kmem_cache_free(zfcp_fc_req_cache, fc_req); |
| 541 | return NULL; |
| 542 | } |
| 543 | |
| 544 | sg_init_one(&fc_req->sg_req, &fc_req->u.gpn_ft.req, |
| 545 | sizeof(struct zfcp_fc_gpn_ft_req)); |
| 546 | |
| 547 | return fc_req; |
| 548 | } |
| 549 | |
| 550 | static int zfcp_fc_send_gpn_ft(struct zfcp_fc_req *fc_req, |
| 551 | struct zfcp_adapter *adapter, int max_bytes) |
| 552 | { |
| 553 | struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els; |
| 554 | struct zfcp_fc_gpn_ft_req *req = &fc_req->u.gpn_ft.req; |
| 555 | DECLARE_COMPLETION_ONSTACK(completion); |
| 556 | int ret; |
| 557 | |
| 558 | zfcp_fc_ct_ns_init(&req->ct_hdr, FC_NS_GPN_FT, max_bytes); |
| 559 | req->gpn_ft.fn_fc4_type = FC_TYPE_FCP; |
| 560 | |
| 561 | ct_els->handler = zfcp_fc_complete; |
| 562 | ct_els->handler_data = &completion; |
| 563 | ct_els->req = &fc_req->sg_req; |
| 564 | ct_els->resp = &fc_req->sg_rsp; |
| 565 | |
| 566 | ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL, |
| 567 | ZFCP_FC_CTELS_TMO); |
| 568 | if (!ret) |
| 569 | wait_for_completion(&completion); |
| 570 | return ret; |
| 571 | } |
| 572 | |
| 573 | static void zfcp_fc_validate_port(struct zfcp_port *port, struct list_head *lh) |
| 574 | { |
| 575 | if (!(atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC)) |
| 576 | return; |
| 577 | |
| 578 | atomic_clear_mask(ZFCP_STATUS_COMMON_NOESC, &port->status); |
| 579 | |
| 580 | if ((port->supported_classes != 0) || |
| 581 | !list_empty(&port->unit_list)) |
| 582 | return; |
| 583 | |
| 584 | list_move_tail(&port->list, lh); |
| 585 | } |
| 586 | |
| 587 | static int zfcp_fc_eval_gpn_ft(struct zfcp_fc_req *fc_req, |
| 588 | struct zfcp_adapter *adapter, int max_entries) |
| 589 | { |
| 590 | struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els; |
| 591 | struct scatterlist *sg = &fc_req->sg_rsp; |
| 592 | struct fc_ct_hdr *hdr = sg_virt(sg); |
| 593 | struct fc_gpn_ft_resp *acc = sg_virt(sg); |
| 594 | struct zfcp_port *port, *tmp; |
| 595 | unsigned long flags; |
| 596 | LIST_HEAD(remove_lh); |
| 597 | u32 d_id; |
| 598 | int ret = 0, x, last = 0; |
| 599 | |
| 600 | if (ct_els->status) |
| 601 | return -EIO; |
| 602 | |
| 603 | if (hdr->ct_cmd != FC_FS_ACC) { |
| 604 | if (hdr->ct_reason == FC_BA_RJT_UNABLE) |
| 605 | return -EAGAIN; /* might be a temporary condition */ |
| 606 | return -EIO; |
| 607 | } |
| 608 | |
| 609 | if (hdr->ct_mr_size) { |
| 610 | dev_warn(&adapter->ccw_device->dev, |
| 611 | "The name server reported %d words residual data\n", |
| 612 | hdr->ct_mr_size); |
| 613 | return -E2BIG; |
| 614 | } |
| 615 | |
| 616 | /* first entry is the header */ |
| 617 | for (x = 1; x < max_entries && !last; x++) { |
| 618 | if (x % (ZFCP_FC_GPN_FT_ENT_PAGE + 1)) |
| 619 | acc++; |
| 620 | else |
| 621 | acc = sg_virt(++sg); |
| 622 | |
| 623 | last = acc->fp_flags & FC_NS_FID_LAST; |
| 624 | d_id = ntoh24(acc->fp_fid); |
| 625 | |
| 626 | /* don't attach ports with a well known address */ |
| 627 | if (d_id >= FC_FID_WELL_KNOWN_BASE) |
| 628 | continue; |
| 629 | /* skip the adapter's port and known remote ports */ |
| 630 | if (acc->fp_wwpn == fc_host_port_name(adapter->scsi_host)) |
| 631 | continue; |
| 632 | |
| 633 | port = zfcp_port_enqueue(adapter, acc->fp_wwpn, |
| 634 | ZFCP_STATUS_COMMON_NOESC, d_id); |
| 635 | if (!IS_ERR(port)) |
| 636 | zfcp_erp_port_reopen(port, 0, "fcegpf1"); |
| 637 | else if (PTR_ERR(port) != -EEXIST) |
| 638 | ret = PTR_ERR(port); |
| 639 | } |
| 640 | |
| 641 | zfcp_erp_wait(adapter); |
| 642 | write_lock_irqsave(&adapter->port_list_lock, flags); |
| 643 | list_for_each_entry_safe(port, tmp, &adapter->port_list, list) |
| 644 | zfcp_fc_validate_port(port, &remove_lh); |
| 645 | write_unlock_irqrestore(&adapter->port_list_lock, flags); |
| 646 | |
| 647 | list_for_each_entry_safe(port, tmp, &remove_lh, list) { |
| 648 | zfcp_erp_port_shutdown(port, 0, "fcegpf2"); |
| 649 | zfcp_device_unregister(&port->dev, &zfcp_sysfs_port_attrs); |
| 650 | } |
| 651 | |
| 652 | return ret; |
| 653 | } |
| 654 | |
| 655 | /** |
| 656 | * zfcp_fc_scan_ports - scan remote ports and attach new ports |
| 657 | * @work: reference to scheduled work |
| 658 | */ |
| 659 | void zfcp_fc_scan_ports(struct work_struct *work) |
| 660 | { |
| 661 | struct zfcp_adapter *adapter = container_of(work, struct zfcp_adapter, |
| 662 | scan_work); |
| 663 | int ret, i; |
| 664 | struct zfcp_fc_req *fc_req; |
| 665 | int chain, max_entries, buf_num, max_bytes; |
| 666 | |
| 667 | chain = adapter->adapter_features & FSF_FEATURE_ELS_CT_CHAINED_SBALS; |
| 668 | buf_num = chain ? ZFCP_FC_GPN_FT_NUM_BUFS : 1; |
| 669 | max_entries = chain ? ZFCP_FC_GPN_FT_MAX_ENT : ZFCP_FC_GPN_FT_ENT_PAGE; |
| 670 | max_bytes = chain ? ZFCP_FC_GPN_FT_MAX_SIZE : ZFCP_FC_CT_SIZE_PAGE; |
| 671 | |
| 672 | if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT && |
| 673 | fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV) |
| 674 | return; |
| 675 | |
| 676 | if (zfcp_fc_wka_port_get(&adapter->gs->ds)) |
| 677 | return; |
| 678 | |
| 679 | fc_req = zfcp_alloc_sg_env(buf_num); |
| 680 | if (!fc_req) |
| 681 | goto out; |
| 682 | |
| 683 | for (i = 0; i < 3; i++) { |
| 684 | ret = zfcp_fc_send_gpn_ft(fc_req, adapter, max_bytes); |
| 685 | if (!ret) { |
| 686 | ret = zfcp_fc_eval_gpn_ft(fc_req, adapter, max_entries); |
| 687 | if (ret == -EAGAIN) |
| 688 | ssleep(1); |
| 689 | else |
| 690 | break; |
| 691 | } |
| 692 | } |
| 693 | zfcp_sg_free_table(&fc_req->sg_rsp, buf_num); |
| 694 | kmem_cache_free(zfcp_fc_req_cache, fc_req); |
| 695 | out: |
| 696 | zfcp_fc_wka_port_put(&adapter->gs->ds); |
| 697 | } |
| 698 | |
| 699 | static void zfcp_fc_ct_els_job_handler(void *data) |
| 700 | { |
| 701 | struct fc_bsg_job *job = data; |
| 702 | struct zfcp_fsf_ct_els *zfcp_ct_els = job->dd_data; |
| 703 | struct fc_bsg_reply *jr = job->reply; |
| 704 | |
| 705 | jr->reply_payload_rcv_len = job->reply_payload.payload_len; |
| 706 | jr->reply_data.ctels_reply.status = FC_CTELS_STATUS_OK; |
| 707 | jr->result = zfcp_ct_els->status ? -EIO : 0; |
| 708 | job->job_done(job); |
| 709 | } |
| 710 | |
| 711 | static struct zfcp_fc_wka_port *zfcp_fc_job_wka_port(struct fc_bsg_job *job) |
| 712 | { |
| 713 | u32 preamble_word1; |
| 714 | u8 gs_type; |
| 715 | struct zfcp_adapter *adapter; |
| 716 | |
| 717 | preamble_word1 = job->request->rqst_data.r_ct.preamble_word1; |
| 718 | gs_type = (preamble_word1 & 0xff000000) >> 24; |
| 719 | |
| 720 | adapter = (struct zfcp_adapter *) job->shost->hostdata[0]; |
| 721 | |
| 722 | switch (gs_type) { |
| 723 | case FC_FST_ALIAS: |
| 724 | return &adapter->gs->as; |
| 725 | case FC_FST_MGMT: |
| 726 | return &adapter->gs->ms; |
| 727 | case FC_FST_TIME: |
| 728 | return &adapter->gs->ts; |
| 729 | break; |
| 730 | case FC_FST_DIR: |
| 731 | return &adapter->gs->ds; |
| 732 | break; |
| 733 | default: |
| 734 | return NULL; |
| 735 | } |
| 736 | } |
| 737 | |
| 738 | static void zfcp_fc_ct_job_handler(void *data) |
| 739 | { |
| 740 | struct fc_bsg_job *job = data; |
| 741 | struct zfcp_fc_wka_port *wka_port; |
| 742 | |
| 743 | wka_port = zfcp_fc_job_wka_port(job); |
| 744 | zfcp_fc_wka_port_put(wka_port); |
| 745 | |
| 746 | zfcp_fc_ct_els_job_handler(data); |
| 747 | } |
| 748 | |
| 749 | static int zfcp_fc_exec_els_job(struct fc_bsg_job *job, |
| 750 | struct zfcp_adapter *adapter) |
| 751 | { |
| 752 | struct zfcp_fsf_ct_els *els = job->dd_data; |
| 753 | struct fc_rport *rport = job->rport; |
| 754 | struct zfcp_port *port; |
| 755 | u32 d_id; |
| 756 | |
| 757 | if (rport) { |
| 758 | port = zfcp_get_port_by_wwpn(adapter, rport->port_name); |
| 759 | if (!port) |
| 760 | return -EINVAL; |
| 761 | |
| 762 | d_id = port->d_id; |
| 763 | put_device(&port->dev); |
| 764 | } else |
| 765 | d_id = ntoh24(job->request->rqst_data.h_els.port_id); |
| 766 | |
| 767 | els->handler = zfcp_fc_ct_els_job_handler; |
| 768 | return zfcp_fsf_send_els(adapter, d_id, els, job->req->timeout / HZ); |
| 769 | } |
| 770 | |
| 771 | static int zfcp_fc_exec_ct_job(struct fc_bsg_job *job, |
| 772 | struct zfcp_adapter *adapter) |
| 773 | { |
| 774 | int ret; |
| 775 | struct zfcp_fsf_ct_els *ct = job->dd_data; |
| 776 | struct zfcp_fc_wka_port *wka_port; |
| 777 | |
| 778 | wka_port = zfcp_fc_job_wka_port(job); |
| 779 | if (!wka_port) |
| 780 | return -EINVAL; |
| 781 | |
| 782 | ret = zfcp_fc_wka_port_get(wka_port); |
| 783 | if (ret) |
| 784 | return ret; |
| 785 | |
| 786 | ct->handler = zfcp_fc_ct_job_handler; |
| 787 | ret = zfcp_fsf_send_ct(wka_port, ct, NULL, job->req->timeout / HZ); |
| 788 | if (ret) |
| 789 | zfcp_fc_wka_port_put(wka_port); |
| 790 | |
| 791 | return ret; |
| 792 | } |
| 793 | |
| 794 | int zfcp_fc_exec_bsg_job(struct fc_bsg_job *job) |
| 795 | { |
| 796 | struct Scsi_Host *shost; |
| 797 | struct zfcp_adapter *adapter; |
| 798 | struct zfcp_fsf_ct_els *ct_els = job->dd_data; |
| 799 | |
| 800 | shost = job->rport ? rport_to_shost(job->rport) : job->shost; |
| 801 | adapter = (struct zfcp_adapter *)shost->hostdata[0]; |
| 802 | |
| 803 | if (!(atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_OPEN)) |
| 804 | return -EINVAL; |
| 805 | |
| 806 | ct_els->req = job->request_payload.sg_list; |
| 807 | ct_els->resp = job->reply_payload.sg_list; |
| 808 | ct_els->handler_data = job; |
| 809 | |
| 810 | switch (job->request->msgcode) { |
| 811 | case FC_BSG_RPT_ELS: |
| 812 | case FC_BSG_HST_ELS_NOLOGIN: |
| 813 | return zfcp_fc_exec_els_job(job, adapter); |
| 814 | case FC_BSG_RPT_CT: |
| 815 | case FC_BSG_HST_CT: |
| 816 | return zfcp_fc_exec_ct_job(job, adapter); |
| 817 | default: |
| 818 | return -EINVAL; |
| 819 | } |
| 820 | } |
| 821 | |
| 822 | int zfcp_fc_timeout_bsg_job(struct fc_bsg_job *job) |
| 823 | { |
| 824 | /* hardware tracks timeout, reset bsg timeout to not interfere */ |
| 825 | return -EAGAIN; |
| 826 | } |
| 827 | |
| 828 | int zfcp_fc_gs_setup(struct zfcp_adapter *adapter) |
| 829 | { |
| 830 | struct zfcp_fc_wka_ports *wka_ports; |
| 831 | |
| 832 | wka_ports = kzalloc(sizeof(struct zfcp_fc_wka_ports), GFP_KERNEL); |
| 833 | if (!wka_ports) |
| 834 | return -ENOMEM; |
| 835 | |
| 836 | adapter->gs = wka_ports; |
| 837 | zfcp_fc_wka_port_init(&wka_ports->ms, FC_FID_MGMT_SERV, adapter); |
| 838 | zfcp_fc_wka_port_init(&wka_ports->ts, FC_FID_TIME_SERV, adapter); |
| 839 | zfcp_fc_wka_port_init(&wka_ports->ds, FC_FID_DIR_SERV, adapter); |
| 840 | zfcp_fc_wka_port_init(&wka_ports->as, FC_FID_ALIASES, adapter); |
| 841 | |
| 842 | return 0; |
| 843 | } |
| 844 | |
| 845 | void zfcp_fc_gs_destroy(struct zfcp_adapter *adapter) |
| 846 | { |
| 847 | kfree(adapter->gs); |
| 848 | adapter->gs = NULL; |
| 849 | } |
| 850 | |