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         NVME_RDMA_CM_INVALID_CNTLID     = 0x09,
  29 };
  30
  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 */