summaryrefslogtreecommitdiff
path: root/drivers/infiniband/ulp/isert/ib_isert.h
blob: 192788a4820cde54795c313a068e662017f222a0 (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
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/in6.h>
#include <rdma/ib_verbs.h>
#include <rdma/rdma_cm.h>
#include <scsi/iser.h>


#define DRV_NAME	"isert"
#define PFX		DRV_NAME ": "

#define isert_dbg(fmt, arg...)				 \
	do {						 \
		if (unlikely(isert_debug_level > 2))	 \
			printk(KERN_DEBUG PFX "%s: " fmt,\
				__func__ , ## arg);	 \
	} while (0)

#define isert_warn(fmt, arg...)				\
	do {						\
		if (unlikely(isert_debug_level > 0))	\
			pr_warn(PFX "%s: " fmt,         \
				__func__ , ## arg);	\
	} while (0)

#define isert_info(fmt, arg...)				\
	do {						\
		if (unlikely(isert_debug_level > 1))	\
			pr_info(PFX "%s: " fmt,         \
				__func__ , ## arg);	\
	} while (0)

#define isert_err(fmt, arg...) \
	pr_err(PFX "%s: " fmt, __func__ , ## arg)

/* Constant PDU lengths calculations */
#define ISER_HEADERS_LEN	(sizeof(struct iser_ctrl) + \
				 sizeof(struct iscsi_hdr))
#define ISER_RX_PAYLOAD_SIZE	(ISER_HEADERS_LEN + ISCSI_DEF_MAX_RECV_SEG_LEN)

/* QP settings */
/* Maximal bounds on received asynchronous PDUs */
#define ISERT_MAX_TX_MISC_PDUS	4 /* NOOP_IN(2) , ASYNC_EVENT(2)   */

#define ISERT_MAX_RX_MISC_PDUS	6 /*
				   * NOOP_OUT(2), TEXT(1),
				   * SCSI_TMFUNC(2), LOGOUT(1)
				   */

#define ISCSI_DEF_XMIT_CMDS_MAX 128 /* from libiscsi.h, must be power of 2 */

#define ISERT_QP_MAX_RECV_DTOS	(ISCSI_DEF_XMIT_CMDS_MAX)

#define ISERT_MIN_POSTED_RX	(ISCSI_DEF_XMIT_CMDS_MAX >> 2)

#define ISERT_INFLIGHT_DATAOUTS	8

#define ISERT_QP_MAX_REQ_DTOS	(ISCSI_DEF_XMIT_CMDS_MAX *    \
				(1 + ISERT_INFLIGHT_DATAOUTS) + \
				ISERT_MAX_TX_MISC_PDUS	+ \
				ISERT_MAX_RX_MISC_PDUS)

#define ISER_RX_PAD_SIZE	(ISCSI_DEF_MAX_RECV_SEG_LEN + 4096 - \
		(ISER_RX_PAYLOAD_SIZE + sizeof(u64) + sizeof(struct ib_sge) + \
		 sizeof(struct ib_cqe)))

#define ISCSI_ISER_SG_TABLESIZE		256

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_BOUND,
	ISER_CONN_FULL_FEATURE,
	ISER_CONN_TERMINATING,
	ISER_CONN_DOWN,
};

struct iser_rx_desc {
	struct iser_ctrl iser_header;
	struct iscsi_hdr iscsi_header;
	char		data[ISCSI_DEF_MAX_RECV_SEG_LEN];
	u64		dma_addr;
	struct ib_sge	rx_sg;
	struct ib_cqe	rx_cqe;
	char		pad[ISER_RX_PAD_SIZE];
} __packed;

static inline struct iser_rx_desc *cqe_to_rx_desc(struct ib_cqe *cqe)
{
	return container_of(cqe, struct iser_rx_desc, rx_cqe);
}

struct iser_tx_desc {
	struct iser_ctrl iser_header;
	struct iscsi_hdr iscsi_header;
	enum isert_desc_type type;
	u64		dma_addr;
	struct ib_sge	tx_sg[2];
	struct ib_cqe	tx_cqe;
	int		num_sge;
	struct ib_send_wr send_wr;
} __packed;

static inline struct iser_tx_desc *cqe_to_tx_desc(struct ib_cqe *cqe)
{
	return container_of(cqe, struct iser_tx_desc, tx_cqe);
}


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_mr		       *sig_mr;
};

struct fast_reg_descriptor {
	struct list_head		list;
	struct ib_mr		       *data_mr;
	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;
};

enum {
	DATA = 0,
	PROT = 1,
	SIG = 2,
};

struct isert_cmd {
	uint32_t		read_stag;
	uint32_t		write_stag;
	uint64_t		read_va;
	uint64_t		write_va;
	uint32_t		inv_rkey;
	u64			pdu_buf_dma;
	u32			pdu_buf_len;
	struct isert_conn	*conn;
	struct iscsi_cmd	*iscsi_cmd;
	struct iser_tx_desc	tx_desc;
	struct iser_rx_desc	*rx_desc;
	enum iser_ib_op_code	iser_ib_op;
	struct ib_sge		*ib_sge;
	struct ib_sge		s_ib_sge;
	int			rdma_wr_num;
	struct ib_rdma_wr	*rdma_wr;
	struct ib_rdma_wr	s_rdma_wr;
	struct ib_sge		ib_sg[3];
	struct isert_data_buf	data;
	struct isert_data_buf	prot;
	struct fast_reg_descriptor *fr_desc;
	struct work_struct	comp_work;
	struct scatterlist	sg;
};

static inline struct isert_cmd *tx_desc_to_cmd(struct iser_tx_desc *desc)
{
	return container_of(desc, struct isert_cmd, tx_desc);
}

struct isert_device;

struct isert_conn {
	enum iser_conn_state	state;
	u32			responder_resources;
	u32			initiator_depth;
	bool			pi_support;
	u32			max_sge;
	struct iser_rx_desc	*login_req_buf;
	char			*login_rsp_buf;
	u64			login_req_dma;
	int			login_req_len;
	u64			login_rsp_dma;
	struct iser_rx_desc	*rx_descs;
	struct ib_recv_wr	rx_wr[ISERT_QP_MAX_RECV_DTOS];
	struct iscsi_conn	*conn;
	struct list_head	node;
	struct completion	login_comp;
	struct completion	login_req_comp;
	struct iser_tx_desc	login_tx_desc;
	struct rdma_cm_id	*cm_id;
	struct ib_qp		*qp;
	struct isert_device	*device;
	struct mutex		mutex;
	struct completion	wait_comp_err;
	struct kref		kref;
	struct list_head	fr_pool;
	int			fr_pool_size;
	/* lock to protect fastreg pool */
	spinlock_t		pool_lock;
	struct work_struct	release_work;
	struct ib_recv_wr       beacon;
	bool                    logout_posted;
	bool                    snd_w_inv;
};

#define ISERT_MAX_CQ 64

/**
 * struct isert_comp - iSER completion context
 *
 * @device:     pointer to device handle
 * @cq:         completion queue
 * @active_qps: Number of active QPs attached
 *              to completion context
 */
struct isert_comp {
	struct isert_device     *device;
	struct ib_cq		*cq;
	int                      active_qps;
};

struct isert_device {
	int			use_fastreg;
	bool			pi_capable;
	int			refcount;
	struct ib_device	*ib_device;
	struct ib_pd		*pd;
	struct isert_comp	*comps;
	int                     comps_used;
	struct list_head	dev_node;
	int			(*reg_rdma_mem)(struct isert_cmd *isert_cmd,
						struct iscsi_conn *conn);
	void			(*unreg_rdma_mem)(struct isert_cmd *isert_cmd,
						  struct isert_conn *isert_conn);
};

struct isert_np {
	struct iscsi_np         *np;
	struct semaphore	sem;
	struct rdma_cm_id	*cm_id;
	struct mutex		mutex;
	struct list_head	accepted;
	struct list_head	pending;
};