1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
2 | /* Copyright 2014 Cisco Systems, Inc. All rights reserved. */ |
3 | |
4 | #ifndef _SNIC_IO_H |
5 | #define _SNIC_IO_H |
6 | |
7 | #define SNIC_DFLT_SG_DESC_CNT 32 /* Default descriptors for sgl */ |
8 | #define SNIC_MAX_SG_DESC_CNT 60 /* Max descriptor for sgl */ |
9 | #define SNIC_SG_DESC_ALIGN 16 /* Descriptor address alignment */ |
10 | |
11 | /* SG descriptor for snic */ |
12 | struct snic_sg_desc { |
13 | __le64 addr; |
14 | __le32 len; |
15 | u32 _resvd; |
16 | }; |
17 | |
18 | struct snic_dflt_sgl { |
19 | struct snic_sg_desc sg_desc[SNIC_DFLT_SG_DESC_CNT]; |
20 | }; |
21 | |
22 | struct snic_max_sgl { |
23 | struct snic_sg_desc sg_desc[SNIC_MAX_SG_DESC_CNT]; |
24 | }; |
25 | |
26 | enum snic_req_cache_type { |
27 | SNIC_REQ_CACHE_DFLT_SGL = 0, /* cache with default size sgl */ |
28 | SNIC_REQ_CACHE_MAX_SGL, /* cache with max size sgl */ |
29 | SNIC_REQ_TM_CACHE, /* cache for task mgmt reqs contains |
30 | snic_host_req objects only*/ |
31 | SNIC_REQ_MAX_CACHES /* number of sgl caches */ |
32 | }; |
33 | |
34 | /* Per IO internal state */ |
35 | struct snic_internal_io_state { |
36 | char *rqi; |
37 | u64 flags; |
38 | u32 state; |
39 | u32 abts_status; /* Abort completion status */ |
40 | u32 lr_status; /* device reset completion status */ |
41 | }; |
42 | |
43 | /* IO state machine */ |
44 | enum snic_ioreq_state { |
45 | SNIC_IOREQ_NOT_INITED = 0, |
46 | SNIC_IOREQ_PENDING, |
47 | SNIC_IOREQ_ABTS_PENDING, |
48 | SNIC_IOREQ_ABTS_COMPLETE, |
49 | SNIC_IOREQ_LR_PENDING, |
50 | SNIC_IOREQ_LR_COMPLETE, |
51 | SNIC_IOREQ_COMPLETE, |
52 | }; |
53 | |
54 | struct snic; |
55 | struct snic_host_req; |
56 | |
57 | /* |
58 | * snic_req_info : Contains info about IO, one per scsi command. |
59 | * Notes: Make sure that the structure is aligned to 16 B |
60 | * this helps in easy access to snic_req_info from snic_host_req |
61 | */ |
62 | struct snic_req_info { |
63 | struct list_head list; |
64 | struct snic_host_req *req; |
65 | u64 start_time; /* start time in jiffies */ |
66 | u16 rq_pool_type; /* noticion of request pool type */ |
67 | u16 req_len; /* buf len passing to fw (req + sgl)*/ |
68 | u32 tgt_id; |
69 | |
70 | u32 tm_tag; |
71 | u8 io_cmpl:1; /* sets to 1 when fw completes IO */ |
72 | u8 resvd[3]; |
73 | struct scsi_cmnd *sc; /* Associated scsi cmd */ |
74 | struct snic *snic; /* Associated snic */ |
75 | ulong sge_va; /* Pointer to Resp Buffer */ |
76 | u64 snsbuf_va; |
77 | |
78 | struct snic_host_req *abort_req; |
79 | struct completion *abts_done; |
80 | |
81 | struct snic_host_req *dr_req; |
82 | struct completion *dr_done; |
83 | }; |
84 | |
85 | |
86 | #define rqi_to_req(rqi) \ |
87 | ((struct snic_host_req *) (((struct snic_req_info *)rqi)->req)) |
88 | |
89 | #define req_to_rqi(req) \ |
90 | ((struct snic_req_info *) (((struct snic_host_req *)req)->hdr.init_ctx)) |
91 | |
92 | #define req_to_sgl(req) \ |
93 | ((struct snic_sg_desc *) (((struct snic_host_req *)req)+1)) |
94 | |
95 | struct snic_req_info * |
96 | snic_req_init(struct snic *, int sg_cnt); |
97 | void snic_req_free(struct snic *, struct snic_req_info *); |
98 | void snic_calc_io_process_time(struct snic *, struct snic_req_info *); |
99 | void snic_pci_unmap_rsp_buf(struct snic *, struct snic_req_info *); |
100 | struct snic_host_req * |
101 | snic_abort_req_init(struct snic *, struct snic_req_info *); |
102 | struct snic_host_req * |
103 | snic_dr_req_init(struct snic *, struct snic_req_info *); |
104 | #endif /* _SNIC_IO_H */ |
105 | |