1
2#include <linux/socket.h>
3#include <linux/in.h>
4#include <linux/in6.h>
5#include <rdma/ib_verbs.h>
6#include <rdma/rdma_cm.h>
7#include <rdma/rw.h>
8#include <scsi/iser.h>
9
10
11#define DRV_NAME "isert"
12#define PFX DRV_NAME ": "
13
14#define isert_dbg(fmt, arg...) \
15 do { \
16 if (unlikely(isert_debug_level > 2)) \
17 printk(KERN_DEBUG PFX "%s: " fmt,\
18 __func__ , ## arg); \
19 } while (0)
20
21#define isert_warn(fmt, arg...) \
22 do { \
23 if (unlikely(isert_debug_level > 0)) \
24 pr_warn(PFX "%s: " fmt, \
25 __func__ , ## arg); \
26 } while (0)
27
28#define isert_info(fmt, arg...) \
29 do { \
30 if (unlikely(isert_debug_level > 1)) \
31 pr_info(PFX "%s: " fmt, \
32 __func__ , ## arg); \
33 } while (0)
34
35#define isert_err(fmt, arg...) \
36 pr_err(PFX "%s: " fmt, __func__ , ## arg)
37
38
39#define ISER_HEADERS_LEN (sizeof(struct iser_ctrl) + \
40 sizeof(struct iscsi_hdr))
41#define ISER_RX_PAYLOAD_SIZE (ISER_HEADERS_LEN + ISCSI_DEF_MAX_RECV_SEG_LEN)
42
43
44
45#define ISERT_MAX_TX_MISC_PDUS 4
46
47#define ISERT_MAX_RX_MISC_PDUS 6
48
49
50
51
52#define ISCSI_DEF_XMIT_CMDS_MAX 128
53
54#define ISERT_QP_MAX_RECV_DTOS (ISCSI_DEF_XMIT_CMDS_MAX)
55
56#define ISERT_MIN_POSTED_RX (ISCSI_DEF_XMIT_CMDS_MAX >> 2)
57
58#define ISERT_QP_MAX_REQ_DTOS (ISCSI_DEF_XMIT_CMDS_MAX + \
59 ISERT_MAX_TX_MISC_PDUS + \
60 ISERT_MAX_RX_MISC_PDUS)
61
62
63
64
65
66#define ISER_RX_SIZE (ISCSI_DEF_MAX_RECV_SEG_LEN + 1024)
67
68
69#define ISCSI_ISER_DEF_SG_TABLESIZE 256
70
71
72#define ISCSI_ISER_MIN_SG_TABLESIZE 128
73
74
75#define ISCSI_ISER_MAX_SG_TABLESIZE 4096
76
77enum isert_desc_type {
78 ISCSI_TX_CONTROL,
79 ISCSI_TX_DATAIN
80};
81
82enum iser_conn_state {
83 ISER_CONN_INIT,
84 ISER_CONN_UP,
85 ISER_CONN_BOUND,
86 ISER_CONN_FULL_FEATURE,
87 ISER_CONN_TERMINATING,
88 ISER_CONN_DOWN,
89};
90
91struct iser_rx_desc {
92 char buf[ISER_RX_SIZE];
93 u64 dma_addr;
94 struct ib_sge rx_sg;
95 struct ib_cqe rx_cqe;
96 bool in_use;
97};
98
99static inline struct iser_rx_desc *cqe_to_rx_desc(struct ib_cqe *cqe)
100{
101 return container_of(cqe, struct iser_rx_desc, rx_cqe);
102}
103
104static void *isert_get_iser_hdr(struct iser_rx_desc *desc)
105{
106 return PTR_ALIGN(desc->buf + ISER_HEADERS_LEN, 512) - ISER_HEADERS_LEN;
107}
108
109static size_t isert_get_hdr_offset(struct iser_rx_desc *desc)
110{
111 return isert_get_iser_hdr(desc) - (void *)desc->buf;
112}
113
114static void *isert_get_iscsi_hdr(struct iser_rx_desc *desc)
115{
116 return isert_get_iser_hdr(desc) + sizeof(struct iser_ctrl);
117}
118
119static void *isert_get_data(struct iser_rx_desc *desc)
120{
121 void *data = isert_get_iser_hdr(desc) + ISER_HEADERS_LEN;
122
123 WARN_ON((uintptr_t)data & 511);
124 return data;
125}
126
127struct iser_tx_desc {
128 struct iser_ctrl iser_header;
129 struct iscsi_hdr iscsi_header;
130 enum isert_desc_type type;
131 u64 dma_addr;
132 struct ib_sge tx_sg[2];
133 struct ib_cqe tx_cqe;
134 int num_sge;
135 struct ib_send_wr send_wr;
136} __packed;
137
138static inline struct iser_tx_desc *cqe_to_tx_desc(struct ib_cqe *cqe)
139{
140 return container_of(cqe, struct iser_tx_desc, tx_cqe);
141}
142
143struct isert_cmd {
144 uint32_t read_stag;
145 uint32_t write_stag;
146 uint64_t read_va;
147 uint64_t write_va;
148 uint32_t inv_rkey;
149 u64 pdu_buf_dma;
150 u32 pdu_buf_len;
151 struct isert_conn *conn;
152 struct iscsi_cmd *iscsi_cmd;
153 struct iser_tx_desc tx_desc;
154 struct iser_rx_desc *rx_desc;
155 struct rdma_rw_ctx rw;
156 struct work_struct comp_work;
157 struct scatterlist sg;
158 bool ctx_init_done;
159};
160
161static inline struct isert_cmd *tx_desc_to_cmd(struct iser_tx_desc *desc)
162{
163 return container_of(desc, struct isert_cmd, tx_desc);
164}
165
166struct isert_device;
167
168struct isert_conn {
169 enum iser_conn_state state;
170 u32 responder_resources;
171 u32 initiator_depth;
172 bool pi_support;
173 struct iser_rx_desc *login_desc;
174 char *login_rsp_buf;
175 int login_req_len;
176 u64 login_rsp_dma;
177 struct iser_rx_desc *rx_descs;
178 struct ib_recv_wr rx_wr[ISERT_QP_MAX_RECV_DTOS];
179 struct iscsi_conn *conn;
180 struct list_head node;
181 struct completion login_comp;
182 struct completion login_req_comp;
183 struct iser_tx_desc login_tx_desc;
184 struct rdma_cm_id *cm_id;
185 struct ib_qp *qp;
186 struct ib_cq *cq;
187 u32 cq_size;
188 struct isert_device *device;
189 struct mutex mutex;
190 struct kref kref;
191 struct work_struct release_work;
192 bool logout_posted;
193 bool snd_w_inv;
194 wait_queue_head_t rem_wait;
195 bool dev_removed;
196};
197
198struct isert_device {
199 bool pi_capable;
200 int refcount;
201 struct ib_device *ib_device;
202 struct ib_pd *pd;
203 struct isert_comp *comps;
204 int comps_used;
205 struct list_head dev_node;
206};
207
208struct isert_np {
209 struct iscsi_np *np;
210 struct semaphore sem;
211 struct rdma_cm_id *cm_id;
212 struct mutex mutex;
213 struct list_head accepted;
214 struct list_head pending;
215};
216
