354 lines
8.5 KiB
C
354 lines
8.5 KiB
C
/*
|
|
* 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>
|
|
#include <rdma/rdma_cm.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,
|
|
|
|
SRP_MAX_ADD_CDB_LEN = 16,
|
|
|
|
SRP_MAX_IMM_SGE = 2,
|
|
SRP_MAX_SGE = SRP_MAX_IMM_SGE + 1,
|
|
/*
|
|
* Choose the immediate data offset such that a 32 byte CDB still fits.
|
|
*/
|
|
SRP_IMM_DATA_OFFSET = sizeof(struct srp_cmd) +
|
|
SRP_MAX_ADD_CDB_LEN +
|
|
sizeof(struct srp_imm_buf),
|
|
};
|
|
|
|
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;
|
|
u32 global_rkey;
|
|
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.
|
|
* @max_it_iu_len: Maximum initiator-to-target information unit length.
|
|
* @max_ti_iu_len: Maximum target-to-initiator information unit length.
|
|
*/
|
|
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;
|
|
};
|
|
uint32_t max_it_iu_len;
|
|
uint32_t max_ti_iu_len;
|
|
bool use_imm_data;
|
|
|
|
/* 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;
|
|
|
|
union {
|
|
struct ib_cm {
|
|
struct sa_path_rec path;
|
|
struct ib_sa_query *path_query;
|
|
int path_query_id;
|
|
struct ib_cm_id *cm_id;
|
|
} ib_cm;
|
|
struct rdma_cm {
|
|
struct rdma_cm_id *cm_id;
|
|
} rdma_cm;
|
|
};
|
|
|
|
struct srp_iu **tx_ring;
|
|
struct srp_iu **rx_ring;
|
|
struct srp_request *req_ring;
|
|
int comp_vector;
|
|
|
|
u64 tsk_mgmt_tag;
|
|
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 */
|
|
u32 global_rkey;
|
|
struct srp_rdma_ch *ch;
|
|
struct net *net;
|
|
u32 ch_count;
|
|
u32 lkey;
|
|
enum srp_target_state state;
|
|
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 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;
|
|
unsigned int target_can_queue;
|
|
int mr_pool_size;
|
|
int mr_per_cmd;
|
|
int queue_size;
|
|
int req_ring_size;
|
|
int comp_vector;
|
|
int tl_retry_count;
|
|
|
|
bool using_rdma_cm;
|
|
|
|
union {
|
|
struct {
|
|
__be64 service_id;
|
|
union ib_gid orig_dgid;
|
|
__be16 pkey;
|
|
} ib_cm;
|
|
struct {
|
|
union {
|
|
struct sockaddr_in ip4;
|
|
struct sockaddr_in6 ip6;
|
|
struct sockaddr_storage ss;
|
|
} src;
|
|
union {
|
|
struct sockaddr_in ip4;
|
|
struct sockaddr_in6 ip6;
|
|
struct sockaddr_storage ss;
|
|
} dst;
|
|
bool src_specified;
|
|
} rdma_cm;
|
|
};
|
|
|
|
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;
|
|
u32 num_sge;
|
|
struct ib_sge sge[SRP_MAX_SGE];
|
|
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 */
|