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1 /*
2  * Copyright (c) 2015 Mellanox Technologies. All rights reserved.
3  *
4  * This program is free software; you can redistribute it and/or modify it
5  * under the terms and conditions of the GNU General Public License,
6  * version 2, as published by the Free Software Foundation.
7  *
8  * This program is distributed in the hope it will be useful, but WITHOUT
9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
11  * more details.
12  */
13
14 #ifndef _LINUX_NVME_RDMA_H
15 #define _LINUX_NVME_RDMA_H
16
17 enum nvme_rdma_cm_fmt {
18         NVME_RDMA_CM_FMT_1_0 = 0x0,
19 };
20
21 enum nvme_rdma_cm_status {
22         NVME_RDMA_CM_INVALID_LEN        = 0x01,
23         NVME_RDMA_CM_INVALID_RECFMT     = 0x02,
24         NVME_RDMA_CM_INVALID_QID        = 0x03,
25         NVME_RDMA_CM_INVALID_HSQSIZE    = 0x04,
26         NVME_RDMA_CM_INVALID_HRQSIZE    = 0x05,
27         NVME_RDMA_CM_NO_RSC             = 0x06,
28         NVME_RDMA_CM_INVALID_IRD        = 0x07,
29         NVME_RDMA_CM_INVALID_ORD        = 0x08,
30 };
31
32 static inline const char *nvme_rdma_cm_msg(enum nvme_rdma_cm_status status)
33 {
34         switch (status) {
35         case NVME_RDMA_CM_INVALID_LEN:
36                 return "invalid length";
37         case NVME_RDMA_CM_INVALID_RECFMT:
38                 return "invalid record format";
39         case NVME_RDMA_CM_INVALID_QID:
40                 return "invalid queue ID";
41         case NVME_RDMA_CM_INVALID_HSQSIZE:
42                 return "invalid host SQ size";
43         case NVME_RDMA_CM_INVALID_HRQSIZE:
44                 return "invalid host RQ size";
45         case NVME_RDMA_CM_NO_RSC:
46                 return "resource not found";
47         case NVME_RDMA_CM_INVALID_IRD:
48                 return "invalid IRD";
49         case NVME_RDMA_CM_INVALID_ORD:
50                 return "Invalid ORD";
51         default:
52                 return "unrecognized reason";
53         }
54 }
55
56 /**
57  * struct nvme_rdma_cm_req - rdma connect request
58  *
59  * @recfmt:        format of the RDMA Private Data
60  * @qid:           queue Identifier for the Admin or I/O Queue
61  * @hrqsize:       host receive queue size to be created
62  * @hsqsize:       host send queue size to be created
63  */
64 struct nvme_rdma_cm_req {
65         __le16          recfmt;
66         __le16          qid;
67         __le16          hrqsize;
68         __le16          hsqsize;
69         u8              rsvd[24];
70 };
71
72 /**
73  * struct nvme_rdma_cm_rep - rdma connect reply
74  *
75  * @recfmt:        format of the RDMA Private Data
76  * @crqsize:       controller receive queue size
77  */
78 struct nvme_rdma_cm_rep {
79         __le16          recfmt;
80         __le16          crqsize;
81         u8              rsvd[28];
82 };
83
84 /**
85  * struct nvme_rdma_cm_rej - rdma connect reject
86  *
87  * @recfmt:        format of the RDMA Private Data
88  * @fsts:          error status for the associated connect request
89  */
90 struct nvme_rdma_cm_rej {
91         __le16          recfmt;
92         __le16          sts;
93 };
94
95 #endif /* _LINUX_NVME_RDMA_H */