IB: Add SCSI RDMA Protocol (SRP) initiator

Add an InfiniBand SCSI RDMA Protocol (SRP) initiator.  This driver is
used to talk talk to InfiniBand SRP targets (storage devices).

Signed-off-by: Roland Dreier <rolandd@cisco.com>

1 files changed, 226 insertions, 0 deletions

diff --git a/include/scsi/srp.h b/include/scsi/srp.h
new file mode 100644
index 000000000000..6c2681dc5b46
--- /dev/null
+++ b/include/scsi/srp.h
@@ -0,0 +1,226 @@
+/*
+ * Copyright (c) 2005 Cisco Systems.  All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ *     Redistribution and use in source and binary forms, with or
+ *     without modification, are permitted provided that the following
+ *     conditions are met:
+ *
+ *      - Redistributions of source code must retain the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer.
+ *
+ *      - Redistributions in binary form must reproduce the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer in the documentation and/or other materials
+ *        provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ * $Id$
+ */
+
+#ifndef SCSI_SRP_H
+#define SCSI_SRP_H
+
+/*
+ * Structures and constants for the SCSI RDMA Protocol (SRP) as
+ * defined by the INCITS T10 committee.  This file was written using
+ * draft Revision 16a of the SRP standard.
+ */
+
+#include <linux/types.h>
+
+enum {
+        SRP_LOGIN_REQ   = 0x00,
+        SRP_TSK_MGMT    = 0x01,
+        SRP_CMD         = 0x02,
+        SRP_I_LOGOUT    = 0x03,
+        SRP_LOGIN_RSP   = 0xc0,
+        SRP_RSP         = 0xc1,
+        SRP_LOGIN_REJ   = 0xc2,
+        SRP_T_LOGOUT    = 0x80,
+        SRP_CRED_REQ    = 0x81,
+        SRP_AER_REQ     = 0x82,
+        SRP_CRED_RSP    = 0x41,
+        SRP_AER_RSP     = 0x42
+};
+
+enum {
+        SRP_BUF_FORMAT_DIRECT   = 1 << 1,
+        SRP_BUF_FORMAT_INDIRECT = 1 << 2
+};
+
+enum {
+        SRP_NO_DATA_DESC        = 0,
+        SRP_DATA_DESC_DIRECT    = 1,
+        SRP_DATA_DESC_INDIRECT  = 2
+};
+
+enum {
+        SRP_TSK_ABORT_TASK      = 0x01,
+        SRP_TSK_ABORT_TASK_SET  = 0x02,
+        SRP_TSK_CLEAR_TASK_SET  = 0x04,
+        SRP_TSK_LUN_RESET       = 0x08,
+        SRP_TSK_CLEAR_ACA       = 0x40
+};
+
+enum srp_login_rej_reason {
+        SRP_LOGIN_REJ_UNABLE_ESTABLISH_CHANNEL          = 0x00010000,
+        SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES            = 0x00010001,
+        SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE        = 0x00010002,
+        SRP_LOGIN_REJ_UNABLE_ASSOCIATE_CHANNEL          = 0x00010003,
+        SRP_LOGIN_REJ_UNSUPPORTED_DESCRIPTOR_FMT        = 0x00010004,
+        SRP_LOGIN_REJ_MULTI_CHANNEL_UNSUPPORTED         = 0x00010005,
+        SRP_LOGIN_REJ_CHANNEL_LIMIT_REACHED             = 0x00010006
+};
+
+struct srp_direct_buf {
+        __be64  va;
+        __be32  key;
+        __be32  len;
+};
+
+/*
+ * We need the packed attribute because the SRP spec puts the list of
+ * descriptors at an offset of 20, which is not aligned to the size
+ * of struct srp_direct_buf.
+ */
+struct srp_indirect_buf {
+        struct srp_direct_buf   table_desc;
+        __be32                  len;
+        struct srp_direct_buf   desc_list[0] __attribute__((packed));
+};
+
+enum {
+        SRP_MULTICHAN_SINGLE = 0,
+        SRP_MULTICHAN_MULTI  = 1
+};
+
+struct srp_login_req {
+        u8      opcode;
+        u8      reserved1[7];
+        u64     tag;
+        __be32  req_it_iu_len;
+        u8      reserved2[4];
+        __be16  req_buf_fmt;
+        u8      req_flags;
+        u8      reserved3[5];
+        u8      initiator_port_id[16];
+        u8      target_port_id[16];
+};
+
+struct srp_login_rsp {
+        u8      opcode;
+        u8      reserved1[3];
+        __be32  req_lim_delta;
+        u64     tag;
+        __be32  max_it_iu_len;
+        __be32  max_ti_iu_len;
+        __be16  buf_fmt;
+        u8      rsp_flags;
+        u8      reserved2[25];
+};
+
+struct srp_login_rej {
+        u8      opcode;
+        u8      reserved1[3];
+        __be32  reason;
+        u64     tag;
+        u8      reserved2[8];
+        __be16  buf_fmt;
+        u8      reserved3[6];
+};
+
+struct srp_i_logout {
+        u8      opcode;
+        u8      reserved[7];
+        u64     tag;
+};
+
+struct srp_t_logout {
+        u8      opcode;
+        u8      sol_not;
+        u8      reserved[2];
+        __be32  reason;
+        u64     tag;
+};
+
+/*
+ * We need the packed attribute because the SRP spec only aligns the
+ * 8-byte LUN field to 4 bytes.
+ */
+struct srp_tsk_mgmt {
+        u8      opcode;
+        u8      sol_not;
+        u8      reserved1[6];
+        u64     tag;
+        u8      reserved2[4];
+        __be64  lun __attribute__((packed));
+        u8      reserved3[2];
+        u8      tsk_mgmt_func;
+        u8      reserved4;
+        u64     task_tag;
+        u8      reserved5[8];
+};
+
+/*
+ * We need the packed attribute because the SRP spec only aligns the
+ * 8-byte LUN field to 4 bytes.
+ */
+struct srp_cmd {
+        u8      opcode;
+        u8      sol_not;
+        u8      reserved1[3];
+        u8      buf_fmt;
+        u8      data_out_desc_cnt;
+        u8      data_in_desc_cnt;
+        u64     tag;
+        u8      reserved2[4];
+        __be64  lun __attribute__((packed));
+        u8      reserved3;
+        u8      task_attr;
+        u8      reserved4;
+        u8      add_cdb_len;
+        u8      cdb[16];
+        u8      add_data[0];
+};
+
+enum {
+        SRP_RSP_FLAG_RSPVALID = 1 << 0,
+        SRP_RSP_FLAG_SNSVALID = 1 << 1,
+        SRP_RSP_FLAG_DOOVER   = 1 << 2,
+        SRP_RSP_FLAG_DOUNDER  = 1 << 3,
+        SRP_RSP_FLAG_DIOVER   = 1 << 4,
+        SRP_RSP_FLAG_DIUNDER  = 1 << 5
+};
+
+struct srp_rsp {
+        u8      opcode;
+        u8      sol_not;
+        u8      reserved1[2];
+        __be32  req_lim_delta;
+        u64     tag;
+        u8      reserved2[2];
+        u8      flags;
+        u8      status;
+        __be32  data_out_res_cnt;
+        __be32  data_in_res_cnt;
+        __be32  sense_data_len;
+        __be32  resp_data_len;
+        u8      data[0];
+};
+
+#endif /* SCSI_SRP_H */