include/linux/nvme-rdma.h

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