include/linux/nvme-rdma.h

0001 /* SPDX-License-Identifier: GPL-2.0 */
0002 /*
0003  * Copyright (c) 2015 Mellanox Technologies. All rights reserved.
0004  */
0005
0006 #ifndef _LINUX_NVME_RDMA_H
0007 #define _LINUX_NVME_RDMA_H
0008
0009 #define NVME_RDMA_MAX_QUEUE_SIZE    128
0010
0011 enum nvme_rdma_cm_fmt {
0012     NVME_RDMA_CM_FMT_1_0 = 0x0,
0013 };
0014
0015 enum nvme_rdma_cm_status {
0016     NVME_RDMA_CM_INVALID_LEN    = 0x01,
0017     NVME_RDMA_CM_INVALID_RECFMT = 0x02,
0018     NVME_RDMA_CM_INVALID_QID    = 0x03,
0019     NVME_RDMA_CM_INVALID_HSQSIZE    = 0x04,
0020     NVME_RDMA_CM_INVALID_HRQSIZE    = 0x05,
0021     NVME_RDMA_CM_NO_RSC     = 0x06,
0022     NVME_RDMA_CM_INVALID_IRD    = 0x07,
0023     NVME_RDMA_CM_INVALID_ORD    = 0x08,
0024 };
0025
0026 static inline const char *nvme_rdma_cm_msg(enum nvme_rdma_cm_status status)
0027 {
0028     switch (status) {
0029     case NVME_RDMA_CM_INVALID_LEN:
0030         return "invalid length";
0031     case NVME_RDMA_CM_INVALID_RECFMT:
0032         return "invalid record format";
0033     case NVME_RDMA_CM_INVALID_QID:
0034         return "invalid queue ID";
0035     case NVME_RDMA_CM_INVALID_HSQSIZE:
0036         return "invalid host SQ size";
0037     case NVME_RDMA_CM_INVALID_HRQSIZE:
0038         return "invalid host RQ size";
0039     case NVME_RDMA_CM_NO_RSC:
0040         return "resource not found";
0041     case NVME_RDMA_CM_INVALID_IRD:
0042         return "invalid IRD";
0043     case NVME_RDMA_CM_INVALID_ORD:
0044         return "Invalid ORD";
0045     default:
0046         return "unrecognized reason";
0047     }
0048 }
0049
0050 /**
0051  * struct nvme_rdma_cm_req - rdma connect request
0052  *
0053  * @recfmt:        format of the RDMA Private Data
0054  * @qid:           queue Identifier for the Admin or I/O Queue
0055  * @hrqsize:       host receive queue size to be created
0056  * @hsqsize:       host send queue size to be created
0057  */
0058 struct nvme_rdma_cm_req {
0059     __le16      recfmt;
0060     __le16      qid;
0061     __le16      hrqsize;
0062     __le16      hsqsize;
0063     u8      rsvd[24];
0064 };
0065
0066 /**
0067  * struct nvme_rdma_cm_rep - rdma connect reply
0068  *
0069  * @recfmt:        format of the RDMA Private Data
0070  * @crqsize:       controller receive queue size
0071  */
0072 struct nvme_rdma_cm_rep {
0073     __le16      recfmt;
0074     __le16      crqsize;
0075     u8      rsvd[28];
0076 };
0077
0078 /**
0079  * struct nvme_rdma_cm_rej - rdma connect reject
0080  *
0081  * @recfmt:        format of the RDMA Private Data
0082  * @sts:           error status for the associated connect request
0083  */
0084 struct nvme_rdma_cm_rej {
0085     __le16      recfmt;
0086     __le16      sts;
0087 };
0088
0089 #endif /* _LINUX_NVME_RDMA_H */