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IB: Add SCSI RDMA Protocol (SRP) initiator

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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>
This commit is contained in:
Roland Dreier 2005-11-02 14:07:13 -08:00
parent 89fbb69c4f
commit aef9ec39c4
7 changed files with 2091 additions and 0 deletions
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2
drivers/infiniband/Kconfig
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@ -33,4 +33,6 @@ source "drivers/infiniband/hw/mthca/Kconfig"
source "drivers/infiniband/ulp/ipoib/Kconfig"
source "drivers/infiniband/ulp/srp/Kconfig"
endmenu

1
drivers/infiniband/Makefile
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@ -1,3 +1,4 @@
obj-$(CONFIG_INFINIBAND) += core/
obj-$(CONFIG_INFINIBAND_MTHCA) += hw/mthca/
obj-$(CONFIG_INFINIBAND_IPOIB) += ulp/ipoib/
obj-$(CONFIG_INFINIBAND_SRP) += ulp/srp/

1
drivers/infiniband/ulp/srp/Kbuild Normal file
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@ -0,0 +1 @@
obj-$(CONFIG_INFINIBAND_SRP) += ib_srp.o

11
drivers/infiniband/ulp/srp/Kconfig Normal file
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@ -0,0 +1,11 @@
config INFINIBAND_SRP
tristate "InfiniBand SCSI RDMA Protocol"
depends on INFINIBAND && SCSI
---help---
Support for the SCSI RDMA Protocol over InfiniBand. This
allows you to access storage devices that speak SRP over
InfiniBand.
The SRP protocol is defined by the INCITS T10 technical
committee. See <http://www.t10.org/>.

1700
drivers/infiniband/ulp/srp/ib_srp.c Normal file
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File diff suppressed because it is too large Load Diff

150
drivers/infiniband/ulp/srp/ib_srp.h Normal file
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@ -0,0 +1,150 @@
/*
* 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: ib_srp.h 3932 2005-11-01 17:19:29Z roland $
*/
#ifndef IB_SRP_H
#define IB_SRP_H
#include <linux/types.h>
#include <linux/list.h>
#include <asm/semaphore.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_cmnd.h>
#include <rdma/ib_verbs.h>
#include <rdma/ib_sa.h>
#include <rdma/ib_cm.h>
enum {
SRP_PATH_REC_TIMEOUT_MS = 1000,
SRP_ABORT_TIMEOUT_MS = 5000,
SRP_PORT_REDIRECT = 1,
SRP_DLID_REDIRECT = 2,
SRP_MAX_IU_LEN = 256,
SRP_RQ_SHIFT = 6,
SRP_RQ_SIZE = 1 << SRP_RQ_SHIFT,
SRP_SQ_SIZE = SRP_RQ_SIZE - 1,
SRP_CQ_SIZE = SRP_SQ_SIZE + SRP_RQ_SIZE,
SRP_TAG_TSK_MGMT = 1 << (SRP_RQ_SHIFT + 1)
};
#define SRP_OP_RECV (1 << 31)
#define SRP_MAX_INDIRECT ((SRP_MAX_IU_LEN - \
sizeof (struct srp_cmd) - \
sizeof (struct srp_indirect_buf)) / 16)
enum srp_target_state {
SRP_TARGET_LIVE,
SRP_TARGET_CONNECTING,
SRP_TARGET_DEAD,
SRP_TARGET_REMOVED
};
struct srp_host {
u8 initiator_port_id[16];
struct ib_device *dev;
u8 port;
struct ib_pd *pd;
struct ib_mr *mr;
struct class_device class_dev;
struct list_head target_list;
struct semaphore target_mutex;
struct completion released;
struct list_head list;
};
struct srp_request {
struct list_head list;
struct scsi_cmnd *scmnd;
struct srp_iu *cmd;
struct srp_iu *tsk_mgmt;
DECLARE_PCI_UNMAP_ADDR(direct_mapping)
struct completion done;
short next;
u8 cmd_done;
u8 tsk_status;
};
struct srp_target_port {
__be64 id_ext;
__be64 ioc_guid;
__be64 service_id;
struct srp_host *srp_host;
struct Scsi_Host *scsi_host;
char target_name[32];
unsigned int scsi_id;
struct ib_sa_path_rec path;
struct ib_sa_query *path_query;
int path_query_id;
struct ib_cm_id *cm_id;
struct ib_cq *cq;
struct ib_qp *qp;
int max_ti_iu_len;
s32 req_lim;
unsigned rx_head;
struct srp_iu *rx_ring[SRP_RQ_SIZE];
unsigned tx_head;
unsigned tx_tail;
struct srp_iu *tx_ring[SRP_SQ_SIZE + 1];
int req_head;
struct list_head req_queue;
struct srp_request req_ring[SRP_SQ_SIZE];
struct work_struct work;
struct list_head list;
struct completion done;
int status;
enum srp_target_state state;
};
struct srp_iu {
dma_addr_t dma;
void *buf;
size_t size;
enum dma_data_direction direction;
};
#endif /* IB_SRP_H */

226
include/scsi/srp.h Normal file
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@ -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 */