1/*******************************************************************
2 * This file is part of the Emulex Linux Device Driver for         *
3 * Fibre Channel Host Bus Adapters.                                *
4 * Copyright (C) 2004-2013 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        64512    /* 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 */
32enum 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	LPFC_EVT_RESET_HBA,
42};
43
44/* structure used to queue event to the discovery tasklet */
45struct lpfc_work_evt {
46	struct list_head      evt_listp;
47	void                 *evt_arg1;
48	void                 *evt_arg2;
49	enum lpfc_work_type   evt;
50};
51
52struct lpfc_scsi_check_condition_event;
53struct lpfc_scsi_varqueuedepth_event;
54struct lpfc_scsi_event_header;
55struct lpfc_fabric_event_header;
56struct lpfc_fcprdchkerr_event;
57
58/* structure used for sending events from fast path */
59struct lpfc_fast_path_event {
60	struct lpfc_work_evt work_evt;
61	struct lpfc_vport     *vport;
62	union {
63		struct lpfc_scsi_check_condition_event check_cond_evt;
64		struct lpfc_scsi_varqueuedepth_event queue_depth_evt;
65		struct lpfc_scsi_event_header scsi_evt;
66		struct lpfc_fabric_event_header fabric_evt;
67		struct lpfc_fcprdchkerr_event read_check_error;
68	} un;
69};
70
71#define LPFC_SLI4_MAX_XRI	1024	/* Used to make the ndlp's xri_bitmap */
72#define XRI_BITMAP_ULONGS (LPFC_SLI4_MAX_XRI / BITS_PER_LONG)
73struct lpfc_node_rrqs {
74	unsigned long xri_bitmap[XRI_BITMAP_ULONGS];
75};
76
77struct lpfc_nodelist {
78	struct list_head nlp_listp;
79	struct lpfc_name nlp_portname;
80	struct lpfc_name nlp_nodename;
81	uint32_t         nlp_flag;		/* entry flags */
82	uint32_t         nlp_add_flag;		/* additional flags */
83	uint32_t         nlp_DID;		/* FC D_ID of entry */
84	uint32_t         nlp_last_elscmd;	/* Last ELS cmd sent */
85	uint16_t         nlp_type;
86#define NLP_FC_NODE        0x1			/* entry is an FC node */
87#define NLP_FABRIC         0x4			/* entry rep a Fabric entity */
88#define NLP_FCP_TARGET     0x8			/* entry is an FCP target */
89#define NLP_FCP_INITIATOR  0x10			/* entry is an FCP Initiator */
90
91	uint16_t        nlp_rpi;
92	uint16_t        nlp_state;		/* state transition indicator */
93	uint16_t        nlp_prev_state;		/* state transition indicator */
94	uint16_t        nlp_xri;		/* output exchange id for RPI */
95	uint16_t        nlp_sid;		/* scsi id */
96#define NLP_NO_SID		0xffff
97	uint16_t	nlp_maxframe;		/* Max RCV frame size */
98	uint8_t		nlp_class_sup;		/* Supported Classes */
99	uint8_t         nlp_retry;		/* used for ELS retries */
100	uint8_t         nlp_fcp_info;	        /* class info, bits 0-3 */
101#define NLP_FCP_2_DEVICE   0x10			/* FCP-2 device */
102
103	uint16_t        nlp_usg_map;	/* ndlp management usage bitmap */
104#define NLP_USG_NODE_ACT_BIT	0x1	/* Indicate ndlp is actively used */
105#define NLP_USG_IACT_REQ_BIT	0x2	/* Request to inactivate ndlp */
106#define NLP_USG_FREE_REQ_BIT	0x4	/* Request to invoke ndlp memory free */
107#define NLP_USG_FREE_ACK_BIT	0x8	/* Indicate ndlp memory free invoked */
108
109	struct timer_list   nlp_delayfunc;	/* Used for delayed ELS cmds */
110	struct lpfc_hba *phba;
111	struct fc_rport *rport;			/* Corresponding FC transport
112						   port structure */
113	struct lpfc_vport *vport;
114	struct lpfc_work_evt els_retry_evt;
115	struct lpfc_work_evt dev_loss_evt;
116	struct kref     kref;
117	atomic_t cmd_pending;
118	uint32_t cmd_qdepth;
119	unsigned long last_change_time;
120	unsigned long *active_rrqs_xri_bitmap;
121	struct lpfc_scsicmd_bkt *lat_data;	/* Latency data */
122};
123struct lpfc_node_rrq {
124	struct list_head list;
125	uint16_t xritag;
126	uint16_t send_rrq;
127	uint16_t rxid;
128	uint32_t         nlp_DID;		/* FC D_ID of entry */
129	struct lpfc_vport *vport;
130	struct lpfc_nodelist *ndlp;
131	unsigned long rrq_stop_time;
132};
133
134/* Defines for nlp_flag (uint32) */
135#define NLP_IGNR_REG_CMPL  0x00000001 /* Rcvd rscn before we cmpl reg login */
136#define NLP_REG_LOGIN_SEND 0x00000002   /* sent reglogin to adapter */
137#define NLP_PLOGI_SND      0x00000020	/* sent PLOGI request for this entry */
138#define NLP_PRLI_SND       0x00000040	/* sent PRLI request for this entry */
139#define NLP_ADISC_SND      0x00000080	/* sent ADISC request for this entry */
140#define NLP_LOGO_SND       0x00000100	/* sent LOGO request for this entry */
141#define NLP_RNID_SND       0x00000400	/* sent RNID request for this entry */
142#define NLP_ELS_SND_MASK   0x000007e0	/* sent ELS request for this entry */
143#define NLP_DEFER_RM       0x00010000	/* Remove this ndlp if no longer used */
144#define NLP_DELAY_TMO      0x00020000	/* delay timeout is running for node */
145#define NLP_NPR_2B_DISC    0x00040000	/* node is included in num_disc_nodes */
146#define NLP_RCV_PLOGI      0x00080000	/* Rcv'ed PLOGI from remote system */
147#define NLP_LOGO_ACC       0x00100000	/* Process LOGO after ACC completes */
148#define NLP_TGT_NO_SCSIID  0x00200000	/* good PRLI but no binding for scsid */
149#define NLP_ISSUE_LOGO     0x00400000	/* waiting to issue a LOGO */
150#define NLP_ACC_REGLOGIN   0x01000000	/* Issue Reg Login after successful
151					   ACC */
152#define NLP_NPR_ADISC      0x02000000	/* Issue ADISC when dq'ed from
153					   NPR list */
154#define NLP_RM_DFLT_RPI    0x04000000	/* need to remove leftover dflt RPI */
155#define NLP_NODEV_REMOVE   0x08000000	/* Defer removal till discovery ends */
156#define NLP_TARGET_REMOVE  0x10000000   /* Target remove in process */
157#define NLP_SC_REQ         0x20000000	/* Target requires authentication */
158#define NLP_FIRSTBURST     0x40000000	/* Target supports FirstBurst */
159#define NLP_RPI_REGISTERED 0x80000000	/* nlp_rpi is valid */
160
161/* Defines for nlp_add_flag (uint32) */
162#define NLP_IN_DEV_LOSS  0x00000001	/* Dev Loss processing in progress */
163
164/* ndlp usage management macros */
165#define NLP_CHK_NODE_ACT(ndlp)		(((ndlp)->nlp_usg_map \
166						& NLP_USG_NODE_ACT_BIT) \
167					&& \
168					!((ndlp)->nlp_usg_map \
169						& NLP_USG_FREE_ACK_BIT))
170#define NLP_SET_NODE_ACT(ndlp)		((ndlp)->nlp_usg_map \
171						|= NLP_USG_NODE_ACT_BIT)
172#define NLP_INT_NODE_ACT(ndlp)		((ndlp)->nlp_usg_map \
173						= NLP_USG_NODE_ACT_BIT)
174#define NLP_CLR_NODE_ACT(ndlp)		((ndlp)->nlp_usg_map \
175						&= ~NLP_USG_NODE_ACT_BIT)
176#define NLP_CHK_IACT_REQ(ndlp)          ((ndlp)->nlp_usg_map \
177						& NLP_USG_IACT_REQ_BIT)
178#define NLP_SET_IACT_REQ(ndlp)          ((ndlp)->nlp_usg_map \
179						|= NLP_USG_IACT_REQ_BIT)
180#define NLP_CHK_FREE_REQ(ndlp)		((ndlp)->nlp_usg_map \
181						& NLP_USG_FREE_REQ_BIT)
182#define NLP_SET_FREE_REQ(ndlp)		((ndlp)->nlp_usg_map \
183						|= NLP_USG_FREE_REQ_BIT)
184#define NLP_CHK_FREE_ACK(ndlp)		((ndlp)->nlp_usg_map \
185						& NLP_USG_FREE_ACK_BIT)
186#define NLP_SET_FREE_ACK(ndlp)		((ndlp)->nlp_usg_map \
187						|= NLP_USG_FREE_ACK_BIT)
188
189/* There are 4 different double linked lists nodelist entries can reside on.
190 * The Port Login (PLOGI) list and Address Discovery (ADISC) list are used
191 * when Link Up discovery or Registered State Change Notification (RSCN)
192 * processing is needed.  Each list holds the nodes that require a PLOGI or
193 * ADISC Extended Link Service (ELS) request.  These lists keep track of the
194 * nodes affected by an RSCN, or a Link Up (Typically, all nodes are effected
195 * by Link Up) event.  The unmapped_list contains all nodes that have
196 * successfully logged into at the Fibre Channel level.  The
197 * mapped_list will contain all nodes that are mapped FCP targets.
198 *
199 * The bind list is a list of undiscovered (potentially non-existent) nodes
200 * that we have saved binding information on. This information is used when
201 * nodes transition from the unmapped to the mapped list.
202 */
203
204/* Defines for nlp_state */
205#define NLP_STE_UNUSED_NODE       0x0	/* node is just allocated */
206#define NLP_STE_PLOGI_ISSUE       0x1	/* PLOGI was sent to NL_PORT */
207#define NLP_STE_ADISC_ISSUE       0x2	/* ADISC was sent to NL_PORT */
208#define NLP_STE_REG_LOGIN_ISSUE   0x3	/* REG_LOGIN was issued for NL_PORT */
209#define NLP_STE_PRLI_ISSUE        0x4	/* PRLI was sent to NL_PORT */
210#define NLP_STE_LOGO_ISSUE	  0x5	/* LOGO was sent to NL_PORT */
211#define NLP_STE_UNMAPPED_NODE     0x6	/* PRLI completed from NL_PORT */
212#define NLP_STE_MAPPED_NODE       0x7	/* Identified as a FCP Target */
213#define NLP_STE_NPR_NODE          0x8	/* NPort disappeared */
214#define NLP_STE_MAX_STATE         0x9
215#define NLP_STE_FREED_NODE        0xff	/* node entry was freed to MEM_NLP */
216
217/* For UNUSED_NODE state, the node has just been allocated.
218 * For PLOGI_ISSUE and REG_LOGIN_ISSUE, the node is on
219 * the PLOGI list. For REG_LOGIN_COMPL, the node is taken off the PLOGI list
220 * and put on the unmapped list. For ADISC processing, the node is taken off
221 * the ADISC list and placed on either the mapped or unmapped list (depending
222 * on its previous state). Once on the unmapped list, a PRLI is issued and the
223 * state changed to PRLI_ISSUE. When the PRLI completion occurs, the state is
224 * changed to PRLI_COMPL. If the completion indicates a mapped
225 * node, the node is taken off the unmapped list. The binding list is checked
226 * for a valid binding, or a binding is automatically assigned. If binding
227 * assignment is unsuccessful, the node is left on the unmapped list. If
228 * binding assignment is successful, the associated binding list entry (if
229 * any) is removed, and the node is placed on the mapped list.
230 */
231/*
232 * For a Link Down, all nodes on the ADISC, PLOGI, unmapped or mapped
233 * lists will receive a DEVICE_RECOVERY event. If the linkdown or devloss timers
234 * expire, all effected nodes will receive a DEVICE_RM event.
235 */
236/*
237 * For a Link Up or RSCN, all nodes will move from the mapped / unmapped lists
238 * to either the ADISC or PLOGI list.  After a Nameserver query or ALPA loopmap
239 * check, additional nodes may be added (DEVICE_ADD) or removed (DEVICE_RM) to /
240 * from the PLOGI or ADISC lists. Once the PLOGI and ADISC lists are populated,
241 * we will first process the ADISC list.  32 entries are processed initially and
242 * ADISC is initited for each one.  Completions / Events for each node are
243 * funnelled thru the state machine.  As each node finishes ADISC processing, it
244 * starts ADISC for any nodes waiting for ADISC processing. If no nodes are
245 * waiting, and the ADISC list count is identically 0, then we are done. For
246 * Link Up discovery, since all nodes on the PLOGI list are UNREG_LOGIN'ed, we
247 * can issue a CLEAR_LA and reenable Link Events. Next we will process the PLOGI
248 * list.  32 entries are processed initially and PLOGI is initited for each one.
249 * Completions / Events for each node are funnelled thru the state machine.  As
250 * each node finishes PLOGI processing, it starts PLOGI for any nodes waiting
251 * for PLOGI processing. If no nodes are waiting, and the PLOGI list count is
252 * identically 0, then we are done. We have now completed discovery / RSCN
253 * handling. Upon completion, ALL nodes should be on either the mapped or
254 * unmapped lists.
255 */
256
257/* Defines for Node List Entry Events that could happen */
258#define NLP_EVT_RCV_PLOGI         0x0	/* Rcv'd an ELS PLOGI command */
259#define NLP_EVT_RCV_PRLI          0x1	/* Rcv'd an ELS PRLI  command */
260#define NLP_EVT_RCV_LOGO          0x2	/* Rcv'd an ELS LOGO  command */
261#define NLP_EVT_RCV_ADISC         0x3	/* Rcv'd an ELS ADISC command */
262#define NLP_EVT_RCV_PDISC         0x4	/* Rcv'd an ELS PDISC command */
263#define NLP_EVT_RCV_PRLO          0x5	/* Rcv'd an ELS PRLO  command */
264#define NLP_EVT_CMPL_PLOGI        0x6	/* Sent an ELS PLOGI command */
265#define NLP_EVT_CMPL_PRLI         0x7	/* Sent an ELS PRLI  command */
266#define NLP_EVT_CMPL_LOGO         0x8	/* Sent an ELS LOGO  command */
267#define NLP_EVT_CMPL_ADISC        0x9	/* Sent an ELS ADISC command */
268#define NLP_EVT_CMPL_REG_LOGIN    0xa	/* REG_LOGIN mbox cmd completed */
269#define NLP_EVT_DEVICE_RM         0xb	/* Device not found in NS / ALPAmap */
270#define NLP_EVT_DEVICE_RECOVERY   0xc	/* Device existence unknown */
271#define NLP_EVT_MAX_EVENT         0xd
272
273