aboutsummaryrefslogtreecommitdiff
path: root/drivers/infiniband/ulp/isert/ib_isert.h
blob: da6612e6800004b0984880d54ef57bcaab1b0be1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/in6.h>
#include <rdma/ib_verbs.h>
#include <rdma/rdma_cm.h>

#define ISERT_RDMA_LISTEN_BACKLOG	10
#define ISCSI_ISER_SG_TABLESIZE		256
#define ISER_FASTREG_LI_WRID		0xffffffffffffffffULL

enum isert_desc_type {
	ISCSI_TX_CONTROL,
	ISCSI_TX_DATAIN
};

enum iser_ib_op_code {
	ISER_IB_RECV,
	ISER_IB_SEND,
	ISER_IB_RDMA_WRITE,
	ISER_IB_RDMA_READ,
};

enum iser_conn_state {
	ISER_CONN_INIT,
	ISER_CONN_UP,
	ISER_CONN_TERMINATING,
	ISER_CONN_DOWN,
};

struct iser_rx_desc {
	struct iser_hdr iser_header;
	struct iscsi_hdr iscsi_header;
	char		data[ISER_RECV_DATA_SEG_LEN];
	u64		dma_addr;
	struct ib_sge	rx_sg;
	char		pad[ISER_RX_PAD_SIZE];
} __packed;

struct iser_tx_desc {
	struct iser_hdr iser_header;
	struct iscsi_hdr iscsi_header;
	enum isert_desc_type type;
	u64		dma_addr;
	struct ib_sge	tx_sg[2];
	int		num_sge;
	struct isert_cmd *isert_cmd;
	struct llist_node *comp_llnode_batch;
	struct llist_node comp_llnode;
	bool		llnode_active;
	struct ib_send_wr send_wr;
} __packed;

enum isert_indicator {
	ISERT_PROTECTED		= 1 << 0,
	ISERT_DATA_KEY_VALID	= 1 << 1,
	ISERT_PROT_KEY_VALID	= 1 << 2,
	ISERT_SIG_KEY_VALID	= 1 << 3,
};

struct pi_context {
	struct ib_mr		       *prot_mr;
	struct ib_fast_reg_page_list   *prot_frpl;
	struct ib_mr		       *sig_mr;
};

struct fast_reg_descriptor {
	struct list_head		list;
	struct ib_mr		       *data_mr;
	struct ib_fast_reg_page_list   *data_frpl;
	u8				ind;
	struct pi_context	       *pi_ctx;
};

struct isert_data_buf {
	struct scatterlist     *sg;
	int			nents;
	u32			sg_off;
	u32			len; /* cur_rdma_length */
	u32			offset;
	unsigned int		dma_nents;
	enum dma_data_direction dma_dir;
};

struct isert_rdma_wr {
	struct list_head	wr_list;
	struct isert_cmd	*isert_cmd;
	enum iser_ib_op_code	iser_ib_op;
	struct ib_sge		*ib_sge;
	struct ib_sge		s_ib_sge;
	int			send_wr_num;
	struct ib_send_wr	*send_wr;
	struct ib_send_wr	s_send_wr;
	struct isert_data_buf	data;
	struct isert_data_buf	prot;
	struct fast_reg_descriptor *fr_desc;
};

struct isert_cmd {
	uint32_t		read_stag;
	uint32_t		write_stag;
	uint64_t		read_va;
	uint64_t		write_va;
	u64			pdu_buf_dma;
	u32			pdu_buf_len;
	u32			read_va_off;
	u32			write_va_off;
	u32			rdma_wr_num;
	struct isert_conn	*conn;
	struct iscsi_cmd	*iscsi_cmd;
	struct iser_tx_desc	tx_desc;
	struct isert_rdma_wr	rdma_wr;
	struct work_struct	comp_work;
};

struct isert_device;

struct isert_conn {
	enum iser_conn_state	state;
	bool			logout_posted;
	int			post_recv_buf_count;
	atomic_t		post_send_buf_count;
	u32			responder_resources;
	u32			initiator_depth;
	u32			max_sge;
	char			*login_buf;
	char			*login_req_buf;
	char			*login_rsp_buf;
	u64			login_req_dma;
	u64			login_rsp_dma;
	unsigned int		conn_rx_desc_head;
	struct iser_rx_desc	*conn_rx_descs;
	struct ib_recv_wr	conn_rx_wr[ISERT_MIN_POSTED_RX];
	struct iscsi_conn	*conn;
	struct list_head	conn_accept_node;
	struct completion	conn_login_comp;
	struct iser_tx_desc	conn_login_tx_desc;
	struct rdma_cm_id	*conn_cm_id;
	struct ib_pd		*conn_pd;
	struct ib_mr		*conn_mr;
	struct ib_qp		*conn_qp;
	struct isert_device	*conn_device;
	struct work_struct	conn_logout_work;
	struct mutex		conn_mutex;
	struct completion	conn_wait;
	struct completion	conn_wait_comp_err;
	struct kref		conn_kref;
	struct list_head	conn_fr_pool;
	int			conn_fr_pool_size;
	/* lock to protect fastreg pool */
	spinlock_t		conn_lock;
#define ISERT_COMP_BATCH_COUNT	8
	int			conn_comp_batch;
	struct llist_head	conn_comp_llist;
};

#define ISERT_MAX_CQ 64

struct isert_cq_desc {
	struct isert_device	*device;
	int			cq_index;
	struct work_struct	cq_rx_work;
	struct work_struct	cq_tx_work;
};

struct isert_device {
	int			use_fastreg;
	bool			pi_capable;
	int			cqs_used;
	int			refcount;
	int			cq_active_qps[ISERT_MAX_CQ];
	struct ib_device	*ib_device;
	struct ib_cq		*dev_rx_cq[ISERT_MAX_CQ];
	struct ib_cq		*dev_tx_cq[ISERT_MAX_CQ];
	struct isert_cq_desc	*cq_desc;
	struct list_head	dev_node;
	struct ib_device_attr	dev_attr;
	int			(*reg_rdma_mem)(struct iscsi_conn *conn,
						    struct iscsi_cmd *cmd,
						    struct isert_rdma_wr *wr);
	void			(*unreg_rdma_mem)(struct isert_cmd *isert_cmd,
						  struct isert_conn *isert_conn);
};

struct isert_np {
	struct semaphore	np_sem;
	struct rdma_cm_id	*np_cm_id;
	struct mutex		np_accept_mutex;
	struct list_head	np_accept_list;
	struct completion	np_login_comp;
};