1 /*******************************************************************
2 * This file is part of the Emulex Linux Device Driver for *
3 * Fibre Channel Host Bus Adapters. *
4 * Copyright (C) 2004-2008 Emulex. All rights reserved. *
5 * EMULEX and SLI are trademarks of Emulex. *
6 * www.emulex.com *
7 * *
8 * This program is free software; you can redistribute it and/or *
9 * modify it under the terms of version 2 of the GNU General *
10 * Public License as published by the Free Software Foundation. *
11 * This program is distributed in the hope that it will be useful. *
12 * ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND *
13 * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, *
14 * FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT, ARE *
15 * DISCLAIMED, EXCEPT TO THE EXTENT THAT SUCH DISCLAIMERS ARE HELD *
16 * TO BE LEGALLY INVALID. See the GNU General Public License for *
17 * more details, a copy of which can be found in the file COPYING *
18 * included with this package. *
19 *******************************************************************/
20
21 #define FC_MAX_HOLD_RSCN 32 /* max number of deferred RSCNs */
22 #define FC_MAX_NS_RSP 65536 /* max size NameServer rsp */
23 #define FC_MAXLOOP 126 /* max devices supported on a fc loop */
24 #define LPFC_DISC_FLOGI_TMO 10 /* Discovery FLOGI ratov */
25
26
27 /* This is the protocol dependent definition for a Node List Entry.
28 * This is used by Fibre Channel protocol to support FCP.
29 */
30
31 /* worker thread events */
32 enum lpfc_work_type {
33 LPFC_EVT_ONLINE,
34 LPFC_EVT_OFFLINE_PREP,
35 LPFC_EVT_OFFLINE,
36 LPFC_EVT_WARM_START,
37 LPFC_EVT_KILL,
38 LPFC_EVT_ELS_RETRY,
39 LPFC_EVT_DEV_LOSS,
40 LPFC_EVT_FASTPATH_MGMT_EVT,
41 };
42
43 /* structure used to queue event to the discovery tasklet */
44 struct lpfc_work_evt {
45 struct list_head evt_listp;
46 void *evt_arg1;
47 void *evt_arg2;
48 enum lpfc_work_type evt;
49 };
50
51 struct lpfc_scsi_check_condition_event;
52 struct lpfc_scsi_varqueuedepth_event;
53 struct lpfc_scsi_event_header;
54 struct lpfc_fabric_event_header;
55 struct lpfc_fcprdchkerr_event;
56
57 /* structure used for sending events from fast path */
58 struct lpfc_fast_path_event {
59 struct lpfc_work_evt work_evt;
60 struct lpfc_vport *vport;
61 union {
62 struct lpfc_scsi_check_condition_event check_cond_evt;
63 struct lpfc_scsi_varqueuedepth_event queue_depth_evt;
64 struct lpfc_scsi_event_header scsi_evt;
65 struct lpfc_fabric_event_header fabric_evt;
66 struct lpfc_fcprdchkerr_event read_check_error;
67 } un;
68 };
69
70 struct lpfc_nodelist {
71 struct list_head nlp_listp;
72 struct lpfc_name nlp_portname;
73 struct lpfc_name nlp_nodename;
74 uint32_t nlp_flag; /* entry flags */
75 uint32_t nlp_DID; /* FC D_ID of entry */
76 uint32_t nlp_last_elscmd; /* Last ELS cmd sent */
77 uint16_t nlp_type;
78 #define NLP_FC_NODE 0x1 /* entry is an FC node */
79 #define NLP_FABRIC 0x4 /* entry rep a Fabric entity */
80 #define NLP_FCP_TARGET 0x8 /* entry is an FCP target */
81 #define NLP_FCP_INITIATOR 0x10 /* entry is an FCP Initiator */
82
83 uint16_t nlp_rpi;
84 uint16_t nlp_state; /* state transition indicator */
85 uint16_t nlp_prev_state; /* state transition indicator */
86 uint16_t nlp_xri; /* output exchange id for RPI */
87 uint16_t nlp_sid; /* scsi id */
88 #define NLP_NO_SID 0xffff
89 uint16_t nlp_maxframe; /* Max RCV frame size */
90 uint8_t nlp_class_sup; /* Supported Classes */
91 uint8_t nlp_retry; /* used for ELS retries */
92 uint8_t nlp_fcp_info; /* class info, bits 0-3 */
93 #define NLP_FCP_2_DEVICE 0x10 /* FCP-2 device */
94
95 uint16_t nlp_usg_map; /* ndlp management usage bitmap */
96 #define NLP_USG_NODE_ACT_BIT 0x1 /* Indicate ndlp is actively used */
97 #define NLP_USG_IACT_REQ_BIT 0x2 /* Request to inactivate ndlp */
98 #define NLP_USG_FREE_REQ_BIT 0x4 /* Request to invoke ndlp memory free */
99 #define NLP_USG_FREE_ACK_BIT 0x8 /* Indicate ndlp memory free invoked */
100
101 struct timer_list nlp_delayfunc; /* Used for delayed ELS cmds */
102 struct lpfc_hba *phba;
103 struct fc_rport *rport; /* Corresponding FC transport
104 port structure */
105 struct lpfc_vport *vport;
106 struct lpfc_work_evt els_retry_evt;
107 struct lpfc_work_evt dev_loss_evt;
108 unsigned long last_ramp_up_time; /* jiffy of last ramp up */
109 unsigned long last_q_full_time; /* jiffy of last queue full */
110 struct kref kref;
111 atomic_t cmd_pending;
112 uint32_t cmd_qdepth;
113 unsigned long last_change_time;
114 struct lpfc_scsicmd_bkt *lat_data; /* Latency data */
115 };
116
117 /* Defines for nlp_flag (uint32) */
118 #define NLP_PLOGI_SND 0x00000020 /* sent PLOGI request for this entry */
119 #define NLP_PRLI_SND 0x00000040 /* sent PRLI request for this entry */
120 #define NLP_ADISC_SND 0x00000080 /* sent ADISC request for this entry */
121 #define NLP_LOGO_SND 0x00000100 /* sent LOGO request for this entry */
122 #define NLP_RNID_SND 0x00000400 /* sent RNID request for this entry */
123 #define NLP_ELS_SND_MASK 0x000007e0 /* sent ELS request for this entry */
124 #define NLP_DEFER_RM 0x00010000 /* Remove this ndlp if no longer used */
125 #define NLP_DELAY_TMO 0x00020000 /* delay timeout is running for node */
126 #define NLP_NPR_2B_DISC 0x00040000 /* node is included in num_disc_nodes */
127 #define NLP_RCV_PLOGI 0x00080000 /* Rcv'ed PLOGI from remote system */
128 #define NLP_LOGO_ACC 0x00100000 /* Process LOGO after ACC completes */
129 #define NLP_TGT_NO_SCSIID 0x00200000 /* good PRLI but no binding for scsid */
130 #define NLP_ACC_REGLOGIN 0x01000000 /* Issue Reg Login after successful
131 ACC */
132 #define NLP_NPR_ADISC 0x02000000 /* Issue ADISC when dq'ed from
133 NPR list */
134 #define NLP_RM_DFLT_RPI 0x04000000 /* need to remove leftover dflt RPI */
135 #define NLP_NODEV_REMOVE 0x08000000 /* Defer removal till discovery ends */
136 #define NLP_TARGET_REMOVE 0x10000000 /* Target remove in process */
137 #define NLP_SC_REQ 0x20000000 /* Target requires authentication */
138 #define NLP_RPI_VALID 0x80000000 /* nlp_rpi is valid */
139
140 /* ndlp usage management macros */
141 #define NLP_CHK_NODE_ACT(ndlp) (((ndlp)->nlp_usg_map \
142 & NLP_USG_NODE_ACT_BIT) \
143 && \
144 !((ndlp)->nlp_usg_map \
145 & NLP_USG_FREE_ACK_BIT))
146 #define NLP_SET_NODE_ACT(ndlp) ((ndlp)->nlp_usg_map \
147 |= NLP_USG_NODE_ACT_BIT)
148 #define NLP_INT_NODE_ACT(ndlp) ((ndlp)->nlp_usg_map \
149 = NLP_USG_NODE_ACT_BIT)
150 #define NLP_CLR_NODE_ACT(ndlp) ((ndlp)->nlp_usg_map \
151 &= ~NLP_USG_NODE_ACT_BIT)
152 #define NLP_CHK_IACT_REQ(ndlp) ((ndlp)->nlp_usg_map \
153 & NLP_USG_IACT_REQ_BIT)
154 #define NLP_SET_IACT_REQ(ndlp) ((ndlp)->nlp_usg_map \
155 |= NLP_USG_IACT_REQ_BIT)
156 #define NLP_CHK_FREE_REQ(ndlp) ((ndlp)->nlp_usg_map \
157 & NLP_USG_FREE_REQ_BIT)
158 #define NLP_SET_FREE_REQ(ndlp) ((ndlp)->nlp_usg_map \
159 |= NLP_USG_FREE_REQ_BIT)
160 #define NLP_CHK_FREE_ACK(ndlp) ((ndlp)->nlp_usg_map \
161 & NLP_USG_FREE_ACK_BIT)
162 #define NLP_SET_FREE_ACK(ndlp) ((ndlp)->nlp_usg_map \
163 |= NLP_USG_FREE_ACK_BIT)
164
165 /* There are 4 different double linked lists nodelist entries can reside on.
166 * The Port Login (PLOGI) list and Address Discovery (ADISC) list are used
167 * when Link Up discovery or Registered State Change Notification (RSCN)
168 * processing is needed. Each list holds the nodes that require a PLOGI or
169 * ADISC Extended Link Service (ELS) request. These lists keep track of the
170 * nodes affected by an RSCN, or a Link Up (Typically, all nodes are effected
171 * by Link Up) event. The unmapped_list contains all nodes that have
172 * successfully logged into at the Fibre Channel level. The
173 * mapped_list will contain all nodes that are mapped FCP targets.
174 *
175 * The bind list is a list of undiscovered (potentially non-existent) nodes
176 * that we have saved binding information on. This information is used when
177 * nodes transition from the unmapped to the mapped list.
178 */
179
180 /* Defines for nlp_state */
181 #define NLP_STE_UNUSED_NODE 0x0 /* node is just allocated */
182 #define NLP_STE_PLOGI_ISSUE 0x1 /* PLOGI was sent to NL_PORT */
183 #define NLP_STE_ADISC_ISSUE 0x2 /* ADISC was sent to NL_PORT */
184 #define NLP_STE_REG_LOGIN_ISSUE 0x3 /* REG_LOGIN was issued for NL_PORT */
185 #define NLP_STE_PRLI_ISSUE 0x4 /* PRLI was sent to NL_PORT */
186 #define NLP_STE_UNMAPPED_NODE 0x5 /* PRLI completed from NL_PORT */
187 #define NLP_STE_MAPPED_NODE 0x6 /* Identified as a FCP Target */
188 #define NLP_STE_NPR_NODE 0x7 /* NPort disappeared */
189 #define NLP_STE_MAX_STATE 0x8
190 #define NLP_STE_FREED_NODE 0xff /* node entry was freed to MEM_NLP */
191
192 /* For UNUSED_NODE state, the node has just been allocated.
193 * For PLOGI_ISSUE and REG_LOGIN_ISSUE, the node is on
194 * the PLOGI list. For REG_LOGIN_COMPL, the node is taken off the PLOGI list
195 * and put on the unmapped list. For ADISC processing, the node is taken off
196 * the ADISC list and placed on either the mapped or unmapped list (depending
197 * on its previous state). Once on the unmapped list, a PRLI is issued and the
198 * state changed to PRLI_ISSUE. When the PRLI completion occurs, the state is
199 * changed to PRLI_COMPL. If the completion indicates a mapped
200 * node, the node is taken off the unmapped list. The binding list is checked
201 * for a valid binding, or a binding is automatically assigned. If binding
202 * assignment is unsuccessful, the node is left on the unmapped list. If
203 * binding assignment is successful, the associated binding list entry (if
204 * any) is removed, and the node is placed on the mapped list.
205 */
206 /*
207 * For a Link Down, all nodes on the ADISC, PLOGI, unmapped or mapped
208 * lists will receive a DEVICE_RECOVERY event. If the linkdown or devloss timers
209 * expire, all effected nodes will receive a DEVICE_RM event.
210 */
211 /*
212 * For a Link Up or RSCN, all nodes will move from the mapped / unmapped lists
213 * to either the ADISC or PLOGI list. After a Nameserver query or ALPA loopmap
214 * check, additional nodes may be added (DEVICE_ADD) or removed (DEVICE_RM) to /
215 * from the PLOGI or ADISC lists. Once the PLOGI and ADISC lists are populated,
216 * we will first process the ADISC list. 32 entries are processed initially and
217 * ADISC is initited for each one. Completions / Events for each node are
218 * funnelled thru the state machine. As each node finishes ADISC processing, it
219 * starts ADISC for any nodes waiting for ADISC processing. If no nodes are
220 * waiting, and the ADISC list count is identically 0, then we are done. For
221 * Link Up discovery, since all nodes on the PLOGI list are UNREG_LOGIN'ed, we
222 * can issue a CLEAR_LA and reenable Link Events. Next we will process the PLOGI
223 * list. 32 entries are processed initially and PLOGI is initited for each one.
224 * Completions / Events for each node are funnelled thru the state machine. As
225 * each node finishes PLOGI processing, it starts PLOGI for any nodes waiting
226 * for PLOGI processing. If no nodes are waiting, and the PLOGI list count is
227 * identically 0, then we are done. We have now completed discovery / RSCN
228 * handling. Upon completion, ALL nodes should be on either the mapped or
229 * unmapped lists.
230 */
231
232 /* Defines for Node List Entry Events that could happen */
233 #define NLP_EVT_RCV_PLOGI 0x0 /* Rcv'd an ELS PLOGI command */
234 #define NLP_EVT_RCV_PRLI 0x1 /* Rcv'd an ELS PRLI command */
235 #define NLP_EVT_RCV_LOGO 0x2 /* Rcv'd an ELS LOGO command */
236 #define NLP_EVT_RCV_ADISC 0x3 /* Rcv'd an ELS ADISC command */
237 #define NLP_EVT_RCV_PDISC 0x4 /* Rcv'd an ELS PDISC command */
238 #define NLP_EVT_RCV_PRLO 0x5 /* Rcv'd an ELS PRLO command */
239 #define NLP_EVT_CMPL_PLOGI 0x6 /* Sent an ELS PLOGI command */
240 #define NLP_EVT_CMPL_PRLI 0x7 /* Sent an ELS PRLI command */
241 #define NLP_EVT_CMPL_LOGO 0x8 /* Sent an ELS LOGO command */
242 #define NLP_EVT_CMPL_ADISC 0x9 /* Sent an ELS ADISC command */
243 #define NLP_EVT_CMPL_REG_LOGIN 0xa /* REG_LOGIN mbox cmd completed */
244 #define NLP_EVT_DEVICE_RM 0xb /* Device not found in NS / ALPAmap */
245 #define NLP_EVT_DEVICE_RECOVERY 0xc /* Device existence unknown */
246 #define NLP_EVT_MAX_EVENT 0xd
247
248
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