nvme-rdma.h: Add includes for nvme rdma_cm negotiation

NVMe over Fabrics RDMA transport defines a connection establishment
protocol over the RDMA connection manager. This header will be used by
both the host and target drivers to negotiate the connection
establishment parameters.

Signed-off-by: Jay Freyensee <james.p.freyensee@intel.com>
Signed-off-by: Ming Lin <ming.l@ssi.samsung.com>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Steve Wise <swise@opengridcomputing.com>
Tested-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Jens Axboe <axboe@fb.com>

diff --git a/include/linux/nvme-rdma.h b/include/linux/nvme-rdma.h
new file mode 100644 (file)
index 0000000..bf240a3
--- /dev/null
+++ b/include/linux/nvme-rdma.h
@@ -0,0 +1,71 @@
+/*
+ * Copyright (c) 2015 Mellanox Technologies. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ */
+
+#ifndef _LINUX_NVME_RDMA_H
+#define _LINUX_NVME_RDMA_H
+
+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,
+};
+
+/**
+ * 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;
+       u8              rsvd[24];
+};
+
+/**
+ * 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
+ * @fsts:          error status for the associated connect request
+ */
+struct nvme_rdma_cm_rej {
+       __le16          recfmt;
+       __le16          sts;
+};
+
+#endif /* _LINUX_NVME_RDMA_H */