4 * Fibre Channel related functions for the zfcp device driver.
6 * Copyright IBM Corporation 2008
11 static void _zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req, u32 range,
12 struct fcp_rscn_element *elem)
15 struct zfcp_port *port;
17 read_lock_irqsave(&zfcp_data.config_lock, flags);
18 list_for_each_entry(port, &fsf_req->adapter->port_list_head, list) {
19 if (atomic_test_mask(ZFCP_STATUS_PORT_WKA, &port->status))
21 /* FIXME: ZFCP_STATUS_PORT_DID_DID check is racy */
22 if (!atomic_test_mask(ZFCP_STATUS_PORT_DID_DID, &port->status))
23 /* Try to connect to unused ports anyway. */
24 zfcp_erp_port_reopen(port,
25 ZFCP_STATUS_COMMON_ERP_FAILED,
27 else if ((port->d_id & range) == (elem->nport_did & range))
28 /* Check connection status for connected ports */
31 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
34 static void zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req)
36 struct fsf_status_read_buffer *status_buffer = (void *)fsf_req->data;
37 struct fcp_rscn_head *fcp_rscn_head;
38 struct fcp_rscn_element *fcp_rscn_element;
43 fcp_rscn_head = (struct fcp_rscn_head *) status_buffer->payload;
44 fcp_rscn_element = (struct fcp_rscn_element *) status_buffer->payload;
47 no_entries = fcp_rscn_head->payload_len /
48 sizeof(struct fcp_rscn_element);
50 for (i = 1; i < no_entries; i++) {
51 /* skip head and start with 1st element */
53 switch (fcp_rscn_element->addr_format) {
54 case ZFCP_PORT_ADDRESS:
55 range_mask = ZFCP_PORTS_RANGE_PORT;
57 case ZFCP_AREA_ADDRESS:
58 range_mask = ZFCP_PORTS_RANGE_AREA;
60 case ZFCP_DOMAIN_ADDRESS:
61 range_mask = ZFCP_PORTS_RANGE_DOMAIN;
63 case ZFCP_FABRIC_ADDRESS:
64 range_mask = ZFCP_PORTS_RANGE_FABRIC;
69 _zfcp_fc_incoming_rscn(fsf_req, range_mask, fcp_rscn_element);
73 static void zfcp_fc_incoming_wwpn(struct zfcp_fsf_req *req, wwn_t wwpn)
75 struct zfcp_adapter *adapter = req->adapter;
76 struct zfcp_port *port;
79 read_lock_irqsave(&zfcp_data.config_lock, flags);
80 list_for_each_entry(port, &adapter->port_list_head, list)
81 if (port->wwpn == wwpn)
83 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
85 if (port && (port->wwpn == wwpn))
86 zfcp_erp_port_forced_reopen(port, 0, 83, req);
89 static void zfcp_fc_incoming_plogi(struct zfcp_fsf_req *req)
91 struct fsf_status_read_buffer *status_buffer =
92 (struct fsf_status_read_buffer *)req->data;
93 struct fsf_plogi *els_plogi =
94 (struct fsf_plogi *) status_buffer->payload;
96 zfcp_fc_incoming_wwpn(req, els_plogi->serv_param.wwpn);
99 static void zfcp_fc_incoming_logo(struct zfcp_fsf_req *req)
101 struct fsf_status_read_buffer *status_buffer =
102 (struct fsf_status_read_buffer *)req->data;
103 struct fcp_logo *els_logo = (struct fcp_logo *) status_buffer->payload;
105 zfcp_fc_incoming_wwpn(req, els_logo->nport_wwpn);
109 * zfcp_fc_incoming_els - handle incoming ELS
110 * @fsf_req - request which contains incoming ELS
112 void zfcp_fc_incoming_els(struct zfcp_fsf_req *fsf_req)
114 struct fsf_status_read_buffer *status_buffer =
115 (struct fsf_status_read_buffer *) fsf_req->data;
116 unsigned int els_type = status_buffer->payload[0];
118 zfcp_san_dbf_event_incoming_els(fsf_req);
119 if (els_type == LS_PLOGI)
120 zfcp_fc_incoming_plogi(fsf_req);
121 else if (els_type == LS_LOGO)
122 zfcp_fc_incoming_logo(fsf_req);
123 else if (els_type == LS_RSCN)
124 zfcp_fc_incoming_rscn(fsf_req);
127 static void zfcp_ns_gid_pn_handler(unsigned long data)
129 struct zfcp_gid_pn_data *gid_pn = (struct zfcp_gid_pn_data *) data;
130 struct zfcp_send_ct *ct = &gid_pn->ct;
131 struct ct_iu_gid_pn_req *ct_iu_req = sg_virt(ct->req);
132 struct ct_iu_gid_pn_resp *ct_iu_resp = sg_virt(ct->resp);
133 struct zfcp_port *port = gid_pn->port;
137 if (ct_iu_resp->header.cmd_rsp_code != ZFCP_CT_ACCEPT) {
138 atomic_set_mask(ZFCP_STATUS_PORT_INVALID_WWPN, &port->status);
142 if (ct_iu_req->wwpn != port->wwpn)
144 /* looks like a valid d_id */
145 port->d_id = ct_iu_resp->d_id & ZFCP_DID_MASK;
146 atomic_set_mask(ZFCP_STATUS_PORT_DID_DID, &port->status);
148 mempool_free(gid_pn, port->adapter->pool.data_gid_pn);
152 * zfcp_fc_ns_gid_pn_request - initiate GID_PN nameserver request
153 * @erp_action: pointer to zfcp_erp_action where GID_PN request is needed
154 * return: -ENOMEM on error, 0 otherwise
156 int zfcp_fc_ns_gid_pn_request(struct zfcp_erp_action *erp_action)
159 struct zfcp_gid_pn_data *gid_pn;
160 struct zfcp_adapter *adapter = erp_action->adapter;
162 gid_pn = mempool_alloc(adapter->pool.data_gid_pn, GFP_ATOMIC);
166 memset(gid_pn, 0, sizeof(*gid_pn));
168 /* setup parameters for send generic command */
169 gid_pn->port = erp_action->port;
170 gid_pn->ct.port = adapter->nameserver_port;
171 gid_pn->ct.handler = zfcp_ns_gid_pn_handler;
172 gid_pn->ct.handler_data = (unsigned long) gid_pn;
173 gid_pn->ct.timeout = ZFCP_NS_GID_PN_TIMEOUT;
174 gid_pn->ct.req = &gid_pn->req;
175 gid_pn->ct.resp = &gid_pn->resp;
176 gid_pn->ct.req_count = 1;
177 gid_pn->ct.resp_count = 1;
178 sg_init_one(&gid_pn->req, &gid_pn->ct_iu_req,
179 sizeof(struct ct_iu_gid_pn_req));
180 sg_init_one(&gid_pn->resp, &gid_pn->ct_iu_resp,
181 sizeof(struct ct_iu_gid_pn_resp));
183 /* setup nameserver request */
184 gid_pn->ct_iu_req.header.revision = ZFCP_CT_REVISION;
185 gid_pn->ct_iu_req.header.gs_type = ZFCP_CT_DIRECTORY_SERVICE;
186 gid_pn->ct_iu_req.header.gs_subtype = ZFCP_CT_NAME_SERVER;
187 gid_pn->ct_iu_req.header.options = ZFCP_CT_SYNCHRONOUS;
188 gid_pn->ct_iu_req.header.cmd_rsp_code = ZFCP_CT_GID_PN;
189 gid_pn->ct_iu_req.header.max_res_size = ZFCP_CT_MAX_SIZE;
190 gid_pn->ct_iu_req.wwpn = erp_action->port->wwpn;
192 ret = zfcp_fsf_send_ct(&gid_pn->ct, adapter->pool.fsf_req_erp,
195 mempool_free(gid_pn, adapter->pool.data_gid_pn);
200 * zfcp_fc_plogi_evaluate - evaluate PLOGI playload
201 * @port: zfcp_port structure
202 * @plogi: plogi payload
204 * Evaluate PLOGI playload and copy important fields into zfcp_port structure
206 void zfcp_fc_plogi_evaluate(struct zfcp_port *port, struct fsf_plogi *plogi)
208 port->maxframe_size = plogi->serv_param.common_serv_param[7] |
209 ((plogi->serv_param.common_serv_param[6] & 0x0F) << 8);
210 if (plogi->serv_param.class1_serv_param[0] & 0x80)
211 port->supported_classes |= FC_COS_CLASS1;
212 if (plogi->serv_param.class2_serv_param[0] & 0x80)
213 port->supported_classes |= FC_COS_CLASS2;
214 if (plogi->serv_param.class3_serv_param[0] & 0x80)
215 port->supported_classes |= FC_COS_CLASS3;
216 if (plogi->serv_param.class4_serv_param[0] & 0x80)
217 port->supported_classes |= FC_COS_CLASS4;
220 struct zfcp_els_adisc {
221 struct zfcp_send_els els;
222 struct scatterlist req;
223 struct scatterlist resp;
224 struct zfcp_ls_adisc ls_adisc;
225 struct zfcp_ls_adisc_acc ls_adisc_acc;
228 static void zfcp_fc_adisc_handler(unsigned long data)
230 struct zfcp_els_adisc *adisc = (struct zfcp_els_adisc *) data;
231 struct zfcp_port *port = adisc->els.port;
232 struct zfcp_ls_adisc_acc *ls_adisc = &adisc->ls_adisc_acc;
234 if (!adisc->els.status) {
235 /* request rejected or timed out */
236 zfcp_erp_port_forced_reopen(port, 0, 63, NULL);
241 port->wwnn = ls_adisc->wwnn;
243 if (port->wwpn != ls_adisc->wwpn)
244 zfcp_erp_port_reopen(port, 0, 64, NULL);
251 static int zfcp_fc_adisc(struct zfcp_port *port)
253 struct zfcp_els_adisc *adisc;
254 struct zfcp_adapter *adapter = port->adapter;
256 adisc = kzalloc(sizeof(struct zfcp_els_adisc), GFP_ATOMIC);
260 adisc->els.req = &adisc->req;
261 adisc->els.resp = &adisc->resp;
262 sg_init_one(adisc->els.req, &adisc->ls_adisc,
263 sizeof(struct zfcp_ls_adisc));
264 sg_init_one(adisc->els.resp, &adisc->ls_adisc_acc,
265 sizeof(struct zfcp_ls_adisc_acc));
267 adisc->els.req_count = 1;
268 adisc->els.resp_count = 1;
269 adisc->els.adapter = adapter;
270 adisc->els.port = port;
271 adisc->els.d_id = port->d_id;
272 adisc->els.handler = zfcp_fc_adisc_handler;
273 adisc->els.handler_data = (unsigned long) adisc;
274 adisc->els.ls_code = adisc->ls_adisc.code = ZFCP_LS_ADISC;
276 /* acc. to FC-FS, hard_nport_id in ADISC should not be set for ports
277 without FC-AL-2 capability, so we don't set it */
278 adisc->ls_adisc.wwpn = fc_host_port_name(adapter->scsi_host);
279 adisc->ls_adisc.wwnn = fc_host_node_name(adapter->scsi_host);
280 adisc->ls_adisc.nport_id = fc_host_port_id(adapter->scsi_host);
282 return zfcp_fsf_send_els(&adisc->els);
286 * zfcp_test_link - lightweight link test procedure
287 * @port: port to be tested
289 * Test status of a link to a remote port using the ELS command ADISC.
290 * If there is a problem with the remote port, error recovery steps
293 void zfcp_test_link(struct zfcp_port *port)
298 retval = zfcp_fc_adisc(port);
299 if (retval == 0 || retval == -EBUSY)
302 /* send of ADISC was not possible */
304 zfcp_erp_port_forced_reopen(port, 0, 65, NULL);