1  /* SPDX-License-Identifier: GPL-2.0 */
2  /*
3   * Copyright (c) 2015 Mellanox Technologies. All rights reserved.
4   */
5  
6  #ifndef _LINUX_NVME_RDMA_H
7  #define _LINUX_NVME_RDMA_H
8  
9  #define NVME_RDMA_IP_PORT		4420
10  
11  #define NVME_RDMA_MAX_QUEUE_SIZE 256
12  #define NVME_RDMA_MAX_METADATA_QUEUE_SIZE 128
13  #define NVME_RDMA_DEFAULT_QUEUE_SIZE 128
14  
15  enum nvme_rdma_cm_fmt {
16  	NVME_RDMA_CM_FMT_1_0 = 0x0,
17  };
18  
19  enum nvme_rdma_cm_status {
20  	NVME_RDMA_CM_INVALID_LEN	= 0x01,
21  	NVME_RDMA_CM_INVALID_RECFMT	= 0x02,
22  	NVME_RDMA_CM_INVALID_QID	= 0x03,
23  	NVME_RDMA_CM_INVALID_HSQSIZE	= 0x04,
24  	NVME_RDMA_CM_INVALID_HRQSIZE	= 0x05,
25  	NVME_RDMA_CM_NO_RSC		= 0x06,
26  	NVME_RDMA_CM_INVALID_IRD	= 0x07,
27  	NVME_RDMA_CM_INVALID_ORD	= 0x08,
28  	NVME_RDMA_CM_INVALID_CNTLID	= 0x09,
29  };
30  
nvme_rdma_cm_msg(enum nvme_rdma_cm_status status)31  static inline const char *nvme_rdma_cm_msg(enum nvme_rdma_cm_status status)
32  {
33  	switch (status) {
34  	case NVME_RDMA_CM_INVALID_LEN:
35  		return "invalid length";
36  	case NVME_RDMA_CM_INVALID_RECFMT:
37  		return "invalid record format";
38  	case NVME_RDMA_CM_INVALID_QID:
39  		return "invalid queue ID";
40  	case NVME_RDMA_CM_INVALID_HSQSIZE:
41  		return "invalid host SQ size";
42  	case NVME_RDMA_CM_INVALID_HRQSIZE:
43  		return "invalid host RQ size";
44  	case NVME_RDMA_CM_NO_RSC:
45  		return "resource not found";
46  	case NVME_RDMA_CM_INVALID_IRD:
47  		return "invalid IRD";
48  	case NVME_RDMA_CM_INVALID_ORD:
49  		return "Invalid ORD";
50  	case NVME_RDMA_CM_INVALID_CNTLID:
51  		return "invalid controller ID";
52  	default:
53  		return "unrecognized reason";
54  	}
55  }
56  
57  /**
58   * struct nvme_rdma_cm_req - rdma connect request
59   *
60   * @recfmt:        format of the RDMA Private Data
61   * @qid:           queue Identifier for the Admin or I/O Queue
62   * @hrqsize:       host receive queue size to be created
63   * @hsqsize:       host send queue size to be created
64   */
65  struct nvme_rdma_cm_req {
66  	__le16		recfmt;
67  	__le16		qid;
68  	__le16		hrqsize;
69  	__le16		hsqsize;
70  	__le16		cntlid;
71  	u8		rsvd[22];
72  };
73  
74  /**
75   * struct nvme_rdma_cm_rep - rdma connect reply
76   *
77   * @recfmt:        format of the RDMA Private Data
78   * @crqsize:       controller receive queue size
79   */
80  struct nvme_rdma_cm_rep {
81  	__le16		recfmt;
82  	__le16		crqsize;
83  	u8		rsvd[28];
84  };
85  
86  /**
87   * struct nvme_rdma_cm_rej - rdma connect reject
88   *
89   * @recfmt:        format of the RDMA Private Data
90   * @sts:           error status for the associated connect request
91   */
92  struct nvme_rdma_cm_rej {
93  	__le16		recfmt;
94  	__le16		sts;
95  };
96  
97  #endif /* _LINUX_NVME_RDMA_H */
98