include/linux/nvme-rdma.h

   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 */