Release 4.7 drivers/infiniband/ulp/srp/ib_srp.h
/*
* 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_DEF_SG_TABLESIZE = 12,
SRP_DEFAULT_QUEUE_SIZE = 1 << 6,
SRP_RSP_SQ_SIZE = 1,
SRP_TSK_MGMT_SQ_SIZE = 1,
SRP_DEFAULT_CMD_SQ_SIZE = SRP_DEFAULT_QUEUE_SIZE - SRP_RSP_SQ_SIZE -
SRP_TSK_MGMT_SQ_SIZE,
SRP_TAG_NO_REQ = ~0U,
SRP_TAG_TSK_MGMT = 1U << 31,
SRP_MAX_PAGES_PER_MR = 512,
};
enum srp_target_state {
SRP_TARGET_SCANNING,
SRP_TARGET_LIVE,
SRP_TARGET_REMOVED,
};
enum srp_iu_type {
SRP_IU_CMD,
SRP_IU_TSK_MGMT,
SRP_IU_RSP,
};
/*
* @mr_page_mask: HCA memory registration page mask.
* @mr_page_size: HCA memory registration page size.
* @mr_max_size: Maximum size in bytes of a single FMR / FR registration
* request.
*/
struct srp_device {
struct list_head dev_list;
struct ib_device *dev;
struct ib_pd *pd;
struct ib_mr *global_mr;
u64 mr_page_mask;
int mr_page_size;
int mr_max_size;
int max_pages_per_mr;
bool has_fmr;
bool has_fr;
bool use_fmr;
bool use_fast_reg;
};
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 mutex add_target_mutex;
};
struct srp_request {
struct scsi_cmnd *scmnd;
struct srp_iu *cmd;
union {
struct ib_pool_fmr **fmr_list;
struct srp_fr_desc **fr_list;
};
u64 *map_page;
struct srp_direct_buf *indirect_desc;
dma_addr_t indirect_dma_addr;
short nmdesc;
struct ib_cqe reg_cqe;
};
/**
* struct srp_rdma_ch
* @comp_vector: Completion vector used by this RDMA channel.
*/
struct srp_rdma_ch {
/* These are RW in the hot path, and commonly used together */
struct list_head free_tx;
spinlock_t lock;
s32 req_lim;
/* These are read-only in the hot path */
struct srp_target_port *target ____cacheline_aligned_in_smp;
struct ib_cq *send_cq;
struct ib_cq *recv_cq;
struct ib_qp *qp;
union {
struct ib_fmr_pool *fmr_pool;
struct srp_fr_pool *fr_pool;
};
/* Everything above this point is used in the hot path of
* command processing. Try to keep them packed into cachelines.
*/
struct completion done;
int status;
struct ib_sa_path_rec path;
struct ib_sa_query *path_query;
int path_query_id;
struct ib_cm_id *cm_id;
struct srp_iu **tx_ring;
struct srp_iu **rx_ring;
struct srp_request *req_ring;
int max_ti_iu_len;
int comp_vector;
struct completion tsk_mgmt_done;
u8 tsk_mgmt_status;
bool connected;
};
/**
* struct srp_target_port
* @comp_vector: Completion vector used by the first RDMA channel created for
* this target port.
*/
struct srp_target_port {
/* read and written in the hot path */
spinlock_t lock;
/* read only in the hot path */
struct ib_mr *global_mr;
struct srp_rdma_ch *ch;
u32 ch_count;
u32 lkey;
enum srp_target_state state;
unsigned int max_iu_len;
unsigned int cmd_sg_cnt;
unsigned int indirect_size;
bool allow_ext_sg;
/* other member variables */
union ib_gid sgid;
__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;
struct srp_rport *rport;
char target_name[32];
unsigned int scsi_id;
unsigned int sg_tablesize;
int mr_pool_size;
int mr_per_cmd;
int queue_size;
int req_ring_size;
int comp_vector;
int tl_retry_count;
union ib_gid orig_dgid;
__be16 pkey;
u32 rq_tmo_jiffies;
int zero_req_lim;
struct work_struct tl_err_work;
struct work_struct remove_work;
struct list_head list;
bool qp_in_error;
};
struct srp_iu {
struct list_head list;
u64 dma;
void *buf;
size_t size;
enum dma_data_direction direction;
struct ib_cqe cqe;
};
/**
* struct srp_fr_desc - fast registration work request arguments
* @entry: Entry in srp_fr_pool.free_list.
* @mr: Memory region.
* @frpl: Fast registration page list.
*/
struct srp_fr_desc {
struct list_head entry;
struct ib_mr *mr;
};
/**
* struct srp_fr_pool - pool of fast registration descriptors
*
* An entry is available for allocation if and only if it occurs in @free_list.
*
* @size: Number of descriptors in this pool.
* @max_page_list_len: Maximum fast registration work request page list length.
* @lock: Protects free_list.
* @free_list: List of free descriptors.
* @desc: Fast registration descriptor pool.
*/
struct srp_fr_pool {
int size;
int max_page_list_len;
spinlock_t lock;
struct list_head free_list;
struct srp_fr_desc desc[0];
};
/**
* struct srp_map_state - per-request DMA memory mapping state
* @desc: Pointer to the element of the SRP buffer descriptor array
* that is being filled in.
* @pages: Array with DMA addresses of pages being considered for
* memory registration.
* @base_dma_addr: DMA address of the first page that has not yet been mapped.
* @dma_len: Number of bytes that will be registered with the next
* FMR or FR memory registration call.
* @total_len: Total number of bytes in the sg-list being mapped.
* @npages: Number of page addresses in the pages[] array.
* @nmdesc: Number of FMR or FR memory descriptors used for mapping.
* @ndesc: Number of SRP buffer descriptors that have been filled in.
*/
struct srp_map_state {
union {
struct {
struct ib_pool_fmr **next;
struct ib_pool_fmr **end;
}
fmr;
struct {
struct srp_fr_desc **next;
struct srp_fr_desc **end;
}
fr;
struct {
void **next;
void **end;
}
gen;
};
struct srp_direct_buf *desc;
union {
u64 *pages;
struct scatterlist *sg;
};
dma_addr_t base_dma_addr;
u32 dma_len;
u32 total_len;
unsigned int npages;
unsigned int nmdesc;
unsigned int ndesc;
};
#endif /* IB_SRP_H */
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