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_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 };
  29
  30 static inline const char *nvme_rdma_cm_msg(enum nvme_rdma_cm_status status)
  31 {
  32         switch (status) {
  33         case NVME_RDMA_CM_INVALID_LEN:
  34                 return "invalid length";
  35         case NVME_RDMA_CM_INVALID_RECFMT:
  36                 return "invalid record format";
  37         case NVME_RDMA_CM_INVALID_QID:
  38                 return "invalid queue ID";
  39         case NVME_RDMA_CM_INVALID_HSQSIZE:
  40                 return "invalid host SQ size";
  41         case NVME_RDMA_CM_INVALID_HRQSIZE:
  42                 return "invalid host RQ size";
  43         case NVME_RDMA_CM_NO_RSC:
  44                 return "resource not found";
  45         case NVME_RDMA_CM_INVALID_IRD:
  46                 return "invalid IRD";
  47         case NVME_RDMA_CM_INVALID_ORD:
  48                 return "Invalid ORD";
  49         default:
  50                 return "unrecognized reason";
  51         }
  52 }
  53
  54 /**
  55  * struct nvme_rdma_cm_req - rdma connect request
  56  *
  57  * @recfmt:        format of the RDMA Private Data
  58  * @qid:           queue Identifier for the Admin or I/O Queue
  59  * @hrqsize:       host receive queue size to be created
  60  * @hsqsize:       host send queue size to be created
  61  */
  62 struct nvme_rdma_cm_req {
  63         __le16          recfmt;
  64         __le16          qid;
  65         __le16          hrqsize;
  66         __le16          hsqsize;
  67         u8              rsvd[24];
  68 };
  69
  70 /**
  71  * struct nvme_rdma_cm_rep - rdma connect reply
  72  *
  73  * @recfmt:        format of the RDMA Private Data
  74  * @crqsize:       controller receive queue size
  75  */
  76 struct nvme_rdma_cm_rep {
  77         __le16          recfmt;
  78         __le16          crqsize;
  79         u8              rsvd[28];
  80 };
  81
  82 /**
  83  * struct nvme_rdma_cm_rej - rdma connect reject
  84  *
  85  * @recfmt:        format of the RDMA Private Data
  86  * @sts:           error status for the associated connect request
  87  */
  88 struct nvme_rdma_cm_rej {
  89         __le16          recfmt;
  90         __le16          sts;
  91 };
  92
  93 #endif /* _LINUX_NVME_RDMA_H */