/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Copyright (c) 2015 Mellanox Technologies. All rights reserved.
 */

#ifndef _LINUX_NVME_RDMA_H
#define _LINUX_NVME_RDMA_H

#define NVME_RDMA_IP_PORT               4420

#define NVME_RDMA_MAX_QUEUE_SIZE 256
#define NVME_RDMA_MAX_METADATA_QUEUE_SIZE 128
#define NVME_RDMA_DEFAULT_QUEUE_SIZE 128

enum nvme_rdma_cm_fmt {
        NVME_RDMA_CM_FMT_1_0 = 0x0,
};

enum nvme_rdma_cm_status {
        NVME_RDMA_CM_INVALID_LEN        = 0x01,
        NVME_RDMA_CM_INVALID_RECFMT     = 0x02,
        NVME_RDMA_CM_INVALID_QID        = 0x03,
        NVME_RDMA_CM_INVALID_HSQSIZE    = 0x04,
        NVME_RDMA_CM_INVALID_HRQSIZE    = 0x05,
        NVME_RDMA_CM_NO_RSC             = 0x06,
        NVME_RDMA_CM_INVALID_IRD        = 0x07,
        NVME_RDMA_CM_INVALID_ORD        = 0x08,
        NVME_RDMA_CM_INVALID_CNTLID     = 0x09,
};

static inline const char *nvme_rdma_cm_msg(enum nvme_rdma_cm_status status)
{
        switch (status) {
        case NVME_RDMA_CM_INVALID_LEN:
                return "invalid length";
        case NVME_RDMA_CM_INVALID_RECFMT:
                return "invalid record format";
        case NVME_RDMA_CM_INVALID_QID:
                return "invalid queue ID";
        case NVME_RDMA_CM_INVALID_HSQSIZE:
                return "invalid host SQ size";
        case NVME_RDMA_CM_INVALID_HRQSIZE:
                return "invalid host RQ size";
        case NVME_RDMA_CM_NO_RSC:
                return "resource not found";
        case NVME_RDMA_CM_INVALID_IRD:
                return "invalid IRD";
        case NVME_RDMA_CM_INVALID_ORD:
                return "Invalid ORD";
        case NVME_RDMA_CM_INVALID_CNTLID:
                return "invalid controller ID";
        default:
                return "unrecognized reason";
        }
}

/**
 * struct nvme_rdma_cm_req - rdma connect request
 *
 * @recfmt:        format of the RDMA Private Data
 * @qid:           queue Identifier for the Admin or I/O Queue
 * @hrqsize:       host receive queue size to be created
 * @hsqsize:       host send queue size to be created
 */
struct nvme_rdma_cm_req {
        __le16          recfmt;
        __le16          qid;
        __le16          hrqsize;
        __le16          hsqsize;
        __le16          cntlid;
        u8              rsvd[22];
};

/**
 * struct nvme_rdma_cm_rep - rdma connect reply
 *
 * @recfmt:        format of the RDMA Private Data
 * @crqsize:       controller receive queue size
 */
struct nvme_rdma_cm_rep {
        __le16          recfmt;
        __le16          crqsize;
        u8              rsvd[28];
};

/**
 * struct nvme_rdma_cm_rej - rdma connect reject
 *
 * @recfmt:        format of the RDMA Private Data
 * @sts:           error status for the associated connect request
 */
struct nvme_rdma_cm_rej {
        __le16          recfmt;
        __le16          sts;
};

#endif /* _LINUX_NVME_RDMA_H */