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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.
*/
#ifndef IB_SRP_H
#define IB_SRP_H
#include <linux/types.h>
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/scatterlist.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>
#include <rdma/ib_fmr_pool.h>
enum {
SRP_PATH_REC_TIMEOUT_MS = 1000,
SRP_ABORT_TIMEOUT_MS = 5000,
SRP_PORT_REDIRECT = 1,
SRP_DLID_REDIRECT = 2,
SRP_STALE_CONN = 3,
SRP_MAX_LUN = 512,
SRP_DEF_SG_TABLESIZE = 12,
SRP_RQ_SHIFT = 6,
SRP_RQ_SIZE = 1 << SRP_RQ_SHIFT,
SRP_SQ_SIZE = SRP_RQ_SIZE,
SRP_RSP_SQ_SIZE = 1,
SRP_REQ_SQ_SIZE = SRP_SQ_SIZE - SRP_RSP_SQ_SIZE,
SRP_TSK_MGMT_SQ_SIZE = 1,
SRP_CMD_SQ_SIZE = SRP_REQ_SQ_SIZE - SRP_TSK_MGMT_SQ_SIZE,
SRP_TAG_NO_REQ = ~0U,
SRP_TAG_TSK_MGMT = 1U << 31,
SRP_FMR_SIZE = 256,
SRP_FMR_POOL_SIZE = 1024,
SRP_FMR_DIRTY_SIZE = SRP_FMR_POOL_SIZE / 4
};
enum srp_target_state {
SRP_TARGET_LIVE,
SRP_TARGET_CONNECTING,
SRP_TARGET_DEAD,
SRP_TARGET_REMOVED
};
enum srp_iu_type {
SRP_IU_CMD,
SRP_IU_TSK_MGMT,
SRP_IU_RSP,
};
struct srp_device {
struct list_head dev_list;
struct ib_device *dev;
struct ib_pd *pd;
struct ib_mr *mr;
struct ib_fmr_pool *fmr_pool;
int fmr_page_shift;
int fmr_page_size;
u64 fmr_page_mask;
};
struct srp_host {
struct srp_device *srp_dev;
u8 port;
struct device dev;
struct list_head target_list;
spinlock_t target_lock;
struct completion released;
struct list_head list;
};
struct srp_request {
struct list_head list;
struct scsi_cmnd *scmnd;
struct srp_iu *cmd;
struct ib_pool_fmr *fmr;
short index;
};
struct srp_target_port {
/* These are RW in the hot path, and commonly used together */
struct list_head free_tx;
struct list_head free_reqs;
spinlock_t lock;
s32 req_lim;
/* These are read-only in the hot path */
struct ib_cq *send_cq ____cacheline_aligned_in_smp;
struct ib_cq *recv_cq;
struct ib_qp *qp;
u32 lkey;
u32 rkey;
enum srp_target_state state;
unsigned int max_iu_len;
unsigned int cmd_sg_cnt;
/* Everything above this point is used in the hot path of
* command processing. Try to keep them packed into cachelines.
*/
__be64 id_ext;
__be64 ioc_guid;
__be64 service_id;
__be64 initiator_ext;
u16 io_class;
struct srp_host *srp_host;
struct Scsi_Host *scsi_host;
char target_name[32];
unsigned int scsi_id;
struct ib_sa_path_rec path;
__be16 orig_dgid[8];
struct ib_sa_query *path_query;
int path_query_id;
struct ib_cm_id *cm_id;
int max_ti_iu_len;
int zero_req_lim;
struct srp_iu *tx_ring[SRP_SQ_SIZE];
struct srp_iu *rx_ring[SRP_RQ_SIZE];
struct srp_request req_ring[SRP_CMD_SQ_SIZE];
struct work_struct work;
struct list_head list;
struct completion done;
int status;
int qp_in_error;
struct completion tsk_mgmt_done;
u8 tsk_mgmt_status;
};
struct srp_iu {
struct list_head list;
u64 dma;
void *buf;
size_t size;
enum dma_data_direction direction;
};
#endif /* IB_SRP_H */
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