aboutsummaryrefslogtreecommitdiff
path: root/drivers/scsi/lpfc/lpfc_disc.h
blob: 1d84b63fccadf49eb9f39374ef3b7d1b163d2d8c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
/*******************************************************************
 * This file is part of the Emulex Linux Device Driver for         *
 * Fibre Channel Host Bus Adapters.                                *
 * Copyright (C) 2004-2008 Emulex.  All rights reserved.           *
 * EMULEX and SLI are trademarks of Emulex.                        *
 * www.emulex.com                                                  *
 *                                                                 *
 * This program is free software; you can redistribute it and/or   *
 * modify it under the terms of version 2 of the GNU General       *
 * Public License as published by the Free Software Foundation.    *
 * This program is distributed in the hope that it will be useful. *
 * ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND          *
 * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,  *
 * FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT, ARE      *
 * DISCLAIMED, EXCEPT TO THE EXTENT THAT SUCH DISCLAIMERS ARE HELD *
 * TO BE LEGALLY INVALID.  See the GNU General Public License for  *
 * more details, a copy of which can be found in the file COPYING  *
 * included with this package.                                     *
 *******************************************************************/

#define FC_MAX_HOLD_RSCN     32	      /* max number of deferred RSCNs */
#define FC_MAX_NS_RSP        64512    /* max size NameServer rsp */
#define FC_MAXLOOP           126      /* max devices supported on a fc loop */
#define LPFC_DISC_FLOGI_TMO  10	      /* Discovery FLOGI ratov */


/* This is the protocol dependent definition for a Node List Entry.
 * This is used by Fibre Channel protocol to support FCP.
 */

/* worker thread events */
enum lpfc_work_type {
	LPFC_EVT_ONLINE,
	LPFC_EVT_OFFLINE_PREP,
	LPFC_EVT_OFFLINE,
	LPFC_EVT_WARM_START,
	LPFC_EVT_KILL,
	LPFC_EVT_ELS_RETRY,
	LPFC_EVT_DEV_LOSS,
	LPFC_EVT_FASTPATH_MGMT_EVT,
	LPFC_EVT_RESET_HBA,
};

/* structure used to queue event to the discovery tasklet */
struct lpfc_work_evt {
	struct list_head      evt_listp;
	void                 *evt_arg1;
	void                 *evt_arg2;
	enum lpfc_work_type   evt;
};

struct lpfc_scsi_check_condition_event;
struct lpfc_scsi_varqueuedepth_event;
struct lpfc_scsi_event_header;
struct lpfc_fabric_event_header;
struct lpfc_fcprdchkerr_event;

/* structure used for sending events from fast path */
struct lpfc_fast_path_event {
	struct lpfc_work_evt work_evt;
	struct lpfc_vport     *vport;
	union {
		struct lpfc_scsi_check_condition_event check_cond_evt;
		struct lpfc_scsi_varqueuedepth_event queue_depth_evt;
		struct lpfc_scsi_event_header scsi_evt;
		struct lpfc_fabric_event_header fabric_evt;
		struct lpfc_fcprdchkerr_event read_check_error;
	} un;
};

#define LPFC_SLI4_MAX_XRI	1024	/* Used to make the ndlp's xri_bitmap */
#define XRI_BITMAP_ULONGS (LPFC_SLI4_MAX_XRI / BITS_PER_LONG)
struct lpfc_node_rrqs {
	unsigned long xri_bitmap[XRI_BITMAP_ULONGS];
};

struct lpfc_nodelist {
	struct list_head nlp_listp;
	struct lpfc_name nlp_portname;
	struct lpfc_name nlp_nodename;
	uint32_t         nlp_flag;		/* entry  flags */
	uint32_t         nlp_DID;		/* FC D_ID of entry */
	uint32_t         nlp_last_elscmd;	/* Last ELS cmd sent */
	uint16_t         nlp_type;
#define NLP_FC_NODE        0x1			/* entry is an FC node */
#define NLP_FABRIC         0x4			/* entry rep a Fabric entity */
#define NLP_FCP_TARGET     0x8			/* entry is an FCP target */
#define NLP_FCP_INITIATOR  0x10			/* entry is an FCP Initiator */

	uint16_t        nlp_rpi;
	uint16_t        nlp_state;		/* state transition indicator */
	uint16_t        nlp_prev_state;		/* state transition indicator */
	uint16_t        nlp_xri;		/* output exchange id for RPI */
	uint16_t        nlp_sid;		/* scsi id */
#define NLP_NO_SID		0xffff
	uint16_t	nlp_maxframe;		/* Max RCV frame size */
	uint8_t		nlp_class_sup;		/* Supported Classes */
	uint8_t         nlp_retry;		/* used for ELS retries */
	uint8_t         nlp_fcp_info;	        /* class info, bits 0-3 */
#define NLP_FCP_2_DEVICE   0x10			/* FCP-2 device */

	uint16_t        nlp_usg_map;	/* ndlp management usage bitmap */
#define NLP_USG_NODE_ACT_BIT	0x1	/* Indicate ndlp is actively used */
#define NLP_USG_IACT_REQ_BIT	0x2	/* Request to inactivate ndlp */
#define NLP_USG_FREE_REQ_BIT	0x4	/* Request to invoke ndlp memory free */
#define NLP_USG_FREE_ACK_BIT	0x8	/* Indicate ndlp memory free invoked */

	struct timer_list   nlp_delayfunc;	/* Used for delayed ELS cmds */
	struct lpfc_hba *phba;
	struct fc_rport *rport;			/* Corresponding FC transport
						   port structure */
	struct lpfc_vport *vport;
	struct lpfc_work_evt els_retry_evt;
	struct lpfc_work_evt dev_loss_evt;
	struct kref     kref;
	atomic_t cmd_pending;
	uint32_t cmd_qdepth;
	unsigned long last_change_time;
	struct lpfc_node_rrqs active_rrqs;
	struct lpfc_scsicmd_bkt *lat_data;	/* Latency data */
};
struct lpfc_node_rrq {
	struct list_head list;
	uint16_t xritag;
	uint16_t send_rrq;
	uint16_t rxid;
	uint32_t         nlp_DID;		/* FC D_ID of entry */
	struct lpfc_vport *vport;
	struct lpfc_nodelist *ndlp;
	unsigned long rrq_stop_time;
};

/* Defines for nlp_flag (uint32) */
#define NLP_IGNR_REG_CMPL  0x00000001 /* Rcvd rscn before we cmpl reg login */
#define NLP_REG_LOGIN_SEND 0x00000002   /* sent reglogin to adapter */
#define NLP_PLOGI_SND      0x00000020	/* sent PLOGI request for this entry */
#define NLP_PRLI_SND       0x00000040	/* sent PRLI request for this entry */
#define NLP_ADISC_SND      0x00000080	/* sent ADISC request for this entry */
#define NLP_LOGO_SND       0x00000100	/* sent LOGO request for this entry */
#define NLP_RNID_SND       0x00000400	/* sent RNID request for this entry */
#define NLP_ELS_SND_MASK   0x000007e0	/* sent ELS request for this entry */
#define NLP_DEFER_RM       0x00010000	/* Remove this ndlp if no longer used */
#define NLP_DELAY_TMO      0x00020000	/* delay timeout is running for node */
#define NLP_NPR_2B_DISC    0x00040000	/* node is included in num_disc_nodes */
#define NLP_RCV_PLOGI      0x00080000	/* Rcv'ed PLOGI from remote system */
#define NLP_LOGO_ACC       0x00100000	/* Process LOGO after ACC completes */
#define NLP_TGT_NO_SCSIID  0x00200000	/* good PRLI but no binding for scsid */
#define NLP_ACC_REGLOGIN   0x01000000	/* Issue Reg Login after successful
					   ACC */
#define NLP_NPR_ADISC      0x02000000	/* Issue ADISC when dq'ed from
					   NPR list */
#define NLP_RM_DFLT_RPI    0x04000000	/* need to remove leftover dflt RPI */
#define NLP_NODEV_REMOVE   0x08000000	/* Defer removal till discovery ends */
#define NLP_TARGET_REMOVE  0x10000000   /* Target remove in process */
#define NLP_SC_REQ         0x20000000	/* Target requires authentication */
#define NLP_RPI_REGISTERED 0x80000000	/* nlp_rpi is valid */

/* ndlp usage management macros */
#define NLP_CHK_NODE_ACT(ndlp)		(((ndlp)->nlp_usg_map \
						& NLP_USG_NODE_ACT_BIT) \
					&& \
					!((ndlp)->nlp_usg_map \
						& NLP_USG_FREE_ACK_BIT))
#define NLP_SET_NODE_ACT(ndlp)		((ndlp)->nlp_usg_map \
						|= NLP_USG_NODE_ACT_BIT)
#define NLP_INT_NODE_ACT(ndlp)		((ndlp)->nlp_usg_map \
						= NLP_USG_NODE_ACT_BIT)
#define NLP_CLR_NODE_ACT(ndlp)		((ndlp)->nlp_usg_map \
						&= ~NLP_USG_NODE_ACT_BIT)
#define NLP_CHK_IACT_REQ(ndlp)          ((ndlp)->nlp_usg_map \
						& NLP_USG_IACT_REQ_BIT)
#define NLP_SET_IACT_REQ(ndlp)          ((ndlp)->nlp_usg_map \
						|= NLP_USG_IACT_REQ_BIT)
#define NLP_CHK_FREE_REQ(ndlp)		((ndlp)->nlp_usg_map \
						& NLP_USG_FREE_REQ_BIT)
#define NLP_SET_FREE_REQ(ndlp)		((ndlp)->nlp_usg_map \
						|= NLP_USG_FREE_REQ_BIT)
#define NLP_CHK_FREE_ACK(ndlp)		((ndlp)->nlp_usg_map \
						& NLP_USG_FREE_ACK_BIT)
#define NLP_SET_FREE_ACK(ndlp)		((ndlp)->nlp_usg_map \
						|= NLP_USG_FREE_ACK_BIT)

/* There are 4 different double linked lists nodelist entries can reside on.
 * The Port Login (PLOGI) list and Address Discovery (ADISC) list are used
 * when Link Up discovery or Registered State Change Notification (RSCN)
 * processing is needed.  Each list holds the nodes that require a PLOGI or
 * ADISC Extended Link Service (ELS) request.  These lists keep track of the
 * nodes affected by an RSCN, or a Link Up (Typically, all nodes are effected
 * by Link Up) event.  The unmapped_list contains all nodes that have
 * successfully logged into at the Fibre Channel level.  The
 * mapped_list will contain all nodes that are mapped FCP targets.
 *
 * The bind list is a list of undiscovered (potentially non-existent) nodes
 * that we have saved binding information on. This information is used when
 * nodes transition from the unmapped to the mapped list.
 */

/* Defines for nlp_state */
#define NLP_STE_UNUSED_NODE       0x0	/* node is just allocated */
#define NLP_STE_PLOGI_ISSUE       0x1	/* PLOGI was sent to NL_PORT */
#define NLP_STE_ADISC_ISSUE       0x2	/* ADISC was sent to NL_PORT */
#define NLP_STE_REG_LOGIN_ISSUE   0x3	/* REG_LOGIN was issued for NL_PORT */
#define NLP_STE_PRLI_ISSUE        0x4	/* PRLI was sent to NL_PORT */
#define NLP_STE_UNMAPPED_NODE     0x5	/* PRLI completed from NL_PORT */
#define NLP_STE_MAPPED_NODE       0x6	/* Identified as a FCP Target */
#define NLP_STE_NPR_NODE          0x7	/* NPort disappeared */
#define NLP_STE_MAX_STATE         0x8
#define NLP_STE_FREED_NODE        0xff	/* node entry was freed to MEM_NLP */

/* For UNUSED_NODE state, the node has just been allocated.
 * For PLOGI_ISSUE and REG_LOGIN_ISSUE, the node is on
 * the PLOGI list. For REG_LOGIN_COMPL, the node is taken off the PLOGI list
 * and put on the unmapped list. For ADISC processing, the node is taken off
 * the ADISC list and placed on either the mapped or unmapped list (depending
 * on its previous state). Once on the unmapped list, a PRLI is issued and the
 * state changed to PRLI_ISSUE. When the PRLI completion occurs, the state is
 * changed to PRLI_COMPL. If the completion indicates a mapped
 * node, the node is taken off the unmapped list. The binding list is checked
 * for a valid binding, or a binding is automatically assigned. If binding
 * assignment is unsuccessful, the node is left on the unmapped list. If
 * binding assignment is successful, the associated binding list entry (if
 * any) is removed, and the node is placed on the mapped list.
 */
/*
 * For a Link Down, all nodes on the ADISC, PLOGI, unmapped or mapped
 * lists will receive a DEVICE_RECOVERY event. If the linkdown or devloss timers
 * expire, all effected nodes will receive a DEVICE_RM event.
 */
/*
 * For a Link Up or RSCN, all nodes will move from the mapped / unmapped lists
 * to either the ADISC or PLOGI list.  After a Nameserver query or ALPA loopmap
 * check, additional nodes may be added (DEVICE_ADD) or removed (DEVICE_RM) to /
 * from the PLOGI or ADISC lists. Once the PLOGI and ADISC lists are populated,
 * we will first process the ADISC list.  32 entries are processed initially and
 * ADISC is initited for each one.  Completions / Events for each node are
 * funnelled thru the state machine.  As each node finishes ADISC processing, it
 * starts ADISC for any nodes waiting for ADISC processing. If no nodes are
 * waiting, and the ADISC list count is identically 0, then we are done. For
 * Link Up discovery, since all nodes on the PLOGI list are UNREG_LOGIN'ed, we
 * can issue a CLEAR_LA and reenable Link Events. Next we will process the PLOGI
 * list.  32 entries are processed initially and PLOGI is initited for each one.
 * Completions / Events for each node are funnelled thru the state machine.  As
 * each node finishes PLOGI processing, it starts PLOGI for any nodes waiting
 * for PLOGI processing. If no nodes are waiting, and the PLOGI list count is
 * identically 0, then we are done. We have now completed discovery / RSCN
 * handling. Upon completion, ALL nodes should be on either the mapped or
 * unmapped lists.
 */

/* Defines for Node List Entry Events that could happen */
#define NLP_EVT_RCV_PLOGI         0x0	/* Rcv'd an ELS PLOGI command */
#define NLP_EVT_RCV_PRLI          0x1	/* Rcv'd an ELS PRLI  command */
#define NLP_EVT_RCV_LOGO          0x2	/* Rcv'd an ELS LOGO  command */
#define NLP_EVT_RCV_ADISC         0x3	/* Rcv'd an ELS ADISC command */
#define NLP_EVT_RCV_PDISC         0x4	/* Rcv'd an ELS PDISC command */
#define NLP_EVT_RCV_PRLO          0x5	/* Rcv'd an ELS PRLO  command */
#define NLP_EVT_CMPL_PLOGI        0x6	/* Sent an ELS PLOGI command */
#define NLP_EVT_CMPL_PRLI         0x7	/* Sent an ELS PRLI  command */
#define NLP_EVT_CMPL_LOGO         0x8	/* Sent an ELS LOGO  command */
#define NLP_EVT_CMPL_ADISC        0x9	/* Sent an ELS ADISC command */
#define NLP_EVT_CMPL_REG_LOGIN    0xa	/* REG_LOGIN mbox cmd completed */
#define NLP_EVT_DEVICE_RM         0xb	/* Device not found in NS / ALPAmap */
#define NLP_EVT_DEVICE_RECOVERY   0xc	/* Device existence unknown */
#define NLP_EVT_MAX_EVENT         0xd