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