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
|
/* SPDX-License-Identifier: GPL-2.0 */
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/in6.h>
#include <rdma/ib_verbs.h>
#include <rdma/rdma_cm.h>
#include <rdma/rw.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_QP_MAX_REQ_DTOS (ISCSI_DEF_XMIT_CMDS_MAX + \
ISERT_MAX_TX_MISC_PDUS + \
ISERT_MAX_RX_MISC_PDUS)
/*
* RX size is default of 8k plus headers, but data needs to align to
* 512 boundary, so use 1024 to have the extra space for alignment.
*/
#define ISER_RX_SIZE (ISCSI_DEF_MAX_RECV_SEG_LEN + 1024)
/* Minimum I/O size is 512KB */
#define ISCSI_ISER_MIN_SG_TABLESIZE 128
/* Maximum support is 16MB I/O size */
#define ISCSI_ISER_MAX_SG_TABLESIZE 4096
enum isert_desc_type {
ISCSI_TX_CONTROL,
ISCSI_TX_DATAIN
};
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 {
char buf[ISER_RX_SIZE];
u64 dma_addr;
struct ib_sge rx_sg;
struct ib_cqe rx_cqe;
bool in_use;
};
static inline struct iser_rx_desc *cqe_to_rx_desc(struct ib_cqe *cqe)
{
return container_of(cqe, struct iser_rx_desc, rx_cqe);
}
static void *isert_get_iser_hdr(struct iser_rx_desc *desc)
{
return PTR_ALIGN(desc->buf + ISER_HEADERS_LEN, 512) - ISER_HEADERS_LEN;
}
static size_t isert_get_hdr_offset(struct iser_rx_desc *desc)
{
return isert_get_iser_hdr(desc) - (void *)desc->buf;
}
static void *isert_get_iscsi_hdr(struct iser_rx_desc *desc)
{
return isert_get_iser_hdr(desc) + sizeof(struct iser_ctrl);
}
static void *isert_get_data(struct iser_rx_desc *desc)
{
void *data = isert_get_iser_hdr(desc) + ISER_HEADERS_LEN;
WARN_ON((uintptr_t)data & 511);
return data;
}
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);
}
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;
struct rdma_rw_ctx rw;
struct work_struct comp_work;
struct scatterlist sg;
bool ctx_init_done;
};
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;
struct iser_rx_desc *login_desc;
char *login_rsp_buf;
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 ib_cq *cq;
u32 cq_size;
struct isert_device *device;
struct mutex mutex;
struct kref kref;
struct work_struct release_work;
bool logout_posted;
bool snd_w_inv;
wait_queue_head_t rem_wait;
bool dev_removed;
};
struct isert_device {
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;
};
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;
};
|
