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1 | #ifndef SCSI_TRANSPORT_SRP_H |
2 | #define SCSI_TRANSPORT_SRP_H |
3 | |
4 | #include <linux/transport_class.h> |
5 | #include <linux/types.h> |
6 | #include <linux/mutex.h> |
7 | |
8 | #define SRP_RPORT_ROLE_INITIATOR 0 |
9 | #define SRP_RPORT_ROLE_TARGET 1 |
10 | |
11 | struct srp_rport_identifiers { |
12 | u8 port_id[16]; |
13 | u8 roles; |
14 | }; |
15 | |
16 | /** |
17 | * enum srp_rport_state - SRP transport layer state |
18 | * @SRP_RPORT_RUNNING: Transport layer operational. |
19 | * @SRP_RPORT_BLOCKED: Transport layer not operational; fast I/O fail timer |
20 | * is running and I/O has been blocked. |
21 | * @SRP_RPORT_FAIL_FAST: Fast I/O fail timer has expired; fail I/O fast. |
22 | * @SRP_RPORT_LOST: Device loss timer has expired; port is being removed. |
23 | */ |
24 | enum srp_rport_state { |
25 | SRP_RPORT_RUNNING, |
26 | SRP_RPORT_BLOCKED, |
27 | SRP_RPORT_FAIL_FAST, |
28 | SRP_RPORT_LOST, |
29 | }; |
30 | |
31 | /** |
32 | * struct srp_rport |
33 | * @lld_data: LLD private data. |
34 | * @mutex: Protects against concurrent rport reconnect / fast_io_fail / |
35 | * dev_loss_tmo activity. |
36 | */ |
37 | struct srp_rport { |
38 | /* for initiator and target drivers */ |
39 | |
40 | struct device dev; |
41 | |
42 | u8 port_id[16]; |
43 | u8 roles; |
44 | |
45 | /* for initiator drivers */ |
46 | |
47 | void *lld_data; |
48 | |
49 | struct mutex mutex; |
50 | enum srp_rport_state state; |
51 | bool deleted; |
52 | int reconnect_delay; |
53 | int failed_reconnects; |
54 | struct delayed_work reconnect_work; |
55 | int fast_io_fail_tmo; |
56 | int dev_loss_tmo; |
57 | struct delayed_work fast_io_fail_work; |
58 | struct delayed_work dev_loss_work; |
59 | }; |
60 | |
61 | /** |
62 | * struct srp_function_template |
63 | * @has_rport_state: Whether or not to create the state, fast_io_fail_tmo and |
64 | * dev_loss_tmo sysfs attribute for an rport. |
65 | * @reset_timer_if_blocked: Whether or srp_timed_out() should reset the command |
66 | * timer if the device on which it has been queued is blocked. |
67 | * @reconnect_delay: If not NULL, points to the default reconnect_delay value. |
68 | * @fast_io_fail_tmo: If not NULL, points to the default fast_io_fail_tmo value. |
69 | * @dev_loss_tmo: If not NULL, points to the default dev_loss_tmo value. |
70 | * @reconnect: Callback function for reconnecting to the target. See also |
71 | * srp_reconnect_rport(). |
72 | * @terminate_rport_io: Callback function for terminating all outstanding I/O |
73 | * requests for an rport. |
74 | */ |
75 | struct srp_function_template { |
76 | /* for initiator drivers */ |
77 | bool has_rport_state; |
78 | bool reset_timer_if_blocked; |
79 | int *reconnect_delay; |
80 | int *fast_io_fail_tmo; |
81 | int *dev_loss_tmo; |
82 | int (*reconnect)(struct srp_rport *rport); |
83 | void (*terminate_rport_io)(struct srp_rport *rport); |
84 | void (*rport_delete)(struct srp_rport *rport); |
85 | /* for target drivers */ |
86 | int (* tsk_mgmt_response)(struct Scsi_Host *, u64, u64, int); |
87 | int (* it_nexus_response)(struct Scsi_Host *, u64, int); |
88 | }; |
89 | |
90 | extern struct scsi_transport_template * |
91 | srp_attach_transport(struct srp_function_template *); |
92 | extern void srp_release_transport(struct scsi_transport_template *); |
93 | |
94 | extern void srp_rport_get(struct srp_rport *rport); |
95 | extern void srp_rport_put(struct srp_rport *rport); |
96 | extern struct srp_rport *srp_rport_add(struct Scsi_Host *, |
97 | struct srp_rport_identifiers *); |
98 | extern void srp_rport_del(struct srp_rport *); |
99 | extern int srp_tmo_valid(int reconnect_delay, int fast_io_fail_tmo, |
100 | int dev_loss_tmo); |
101 | extern int srp_reconnect_rport(struct srp_rport *rport); |
102 | extern void srp_start_tl_fail_timers(struct srp_rport *rport); |
103 | extern void srp_remove_host(struct Scsi_Host *); |
104 | |
105 | /** |
106 | * srp_chkready() - evaluate the transport layer state before I/O |
107 | * |
108 | * Returns a SCSI result code that can be returned by the LLD queuecommand() |
109 | * implementation. The role of this function is similar to that of |
110 | * fc_remote_port_chkready(). |
111 | */ |
112 | static inline int srp_chkready(struct srp_rport *rport) |
113 | { |
114 | switch (rport->state) { |
115 | case SRP_RPORT_RUNNING: |
116 | case SRP_RPORT_BLOCKED: |
117 | default: |
118 | return 0; |
119 | case SRP_RPORT_FAIL_FAST: |
120 | return DID_TRANSPORT_FAILFAST << 16; |
121 | case SRP_RPORT_LOST: |
122 | return DID_NO_CONNECT << 16; |
123 | } |
124 | } |
125 | |
126 | #endif |
127 |
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