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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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150
drivers/infiniband/ulp/srp/ib_srp.h Normal file
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/*
* 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 */