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#define ISER_RX_PAD_SIZE (ISCSI_DEF_MAX_RECV_SEG_LEN + 4096 - \
63 (ISER_RX_PAYLOAD_SIZE + sizeof(u64) + sizeof(struct ib_sge) + \
64 sizeof(struct ib_cqe) + sizeof(bool)))
65
66#define ISCSI_ISER_SG_TABLESIZE 256
67
68enum isert_desc_type {
69 ISCSI_TX_CONTROL,
70 ISCSI_TX_DATAIN
71};
72
73enum iser_conn_state {
74 ISER_CONN_INIT,
75 ISER_CONN_UP,
76 ISER_CONN_BOUND,
77 ISER_CONN_FULL_FEATURE,
78 ISER_CONN_TERMINATING,
79 ISER_CONN_DOWN,
80};
81
82struct iser_rx_desc {
83 struct iser_ctrl iser_header;
84 struct iscsi_hdr iscsi_header;
85 char data[ISCSI_DEF_MAX_RECV_SEG_LEN];
86 u64 dma_addr;
87 struct ib_sge rx_sg;
88 struct ib_cqe rx_cqe;
89 bool in_use;
90 char pad[ISER_RX_PAD_SIZE];
91} __packed;
92
93static inline struct iser_rx_desc *cqe_to_rx_desc(struct ib_cqe *cqe)
94{
95 return container_of(cqe, struct iser_rx_desc, rx_cqe);
96}
97
98struct iser_tx_desc {
99 struct iser_ctrl iser_header;
100 struct iscsi_hdr iscsi_header;
101 enum isert_desc_type type;
102 u64 dma_addr;
103 struct ib_sge tx_sg[2];
104 struct ib_cqe tx_cqe;
105 int num_sge;
106 struct ib_send_wr send_wr;
107} __packed;
108
109static inline struct iser_tx_desc *cqe_to_tx_desc(struct ib_cqe *cqe)
110{
111 return container_of(cqe, struct iser_tx_desc, tx_cqe);
112}
113
114struct isert_cmd {
115 uint32_t read_stag;
116 uint32_t write_stag;
117 uint64_t read_va;
118 uint64_t write_va;
119 uint32_t inv_rkey;
120 u64 pdu_buf_dma;
121 u32 pdu_buf_len;
122 struct isert_conn *conn;
123 struct iscsi_cmd *iscsi_cmd;
124 struct iser_tx_desc tx_desc;
125 struct iser_rx_desc *rx_desc;
126 struct rdma_rw_ctx rw;
127 struct work_struct comp_work;
128 struct scatterlist sg;
129 bool ctx_init_done;
130};
131
132static inline struct isert_cmd *tx_desc_to_cmd(struct iser_tx_desc *desc)
133{
134 return container_of(desc, struct isert_cmd, tx_desc);
135}
136
137struct isert_device;
138
139struct isert_conn {
140 enum iser_conn_state state;
141 u32 responder_resources;
142 u32 initiator_depth;
143 bool pi_support;
144 struct iser_rx_desc *login_req_buf;
145 char *login_rsp_buf;
146 u64 login_req_dma;
147 int login_req_len;
148 u64 login_rsp_dma;
149 struct iser_rx_desc *rx_descs;
150 struct ib_recv_wr rx_wr[ISERT_QP_MAX_RECV_DTOS];
151 struct iscsi_conn *conn;
152 struct list_head node;
153 struct completion login_comp;
154 struct completion login_req_comp;
155 struct iser_tx_desc login_tx_desc;
156 struct rdma_cm_id *cm_id;
157 struct ib_qp *qp;
158 struct isert_device *device;
159 struct mutex mutex;
160 struct kref kref;
161 struct work_struct release_work;
162 bool logout_posted;
163 bool snd_w_inv;
164 wait_queue_head_t rem_wait;
165 bool dev_removed;
166};
167
168#define ISERT_MAX_CQ 64
169
170
171
172
173
174
175
176
177
178struct isert_comp {
179 struct isert_device *device;
180 struct ib_cq *cq;
181 int active_qps;
182};
183
184struct isert_device {
185 bool pi_capable;
186 int refcount;
187 struct ib_device *ib_device;
188 struct ib_pd *pd;
189 struct isert_comp *comps;
190 int comps_used;
191 struct list_head dev_node;
192};
193
194struct isert_np {
195 struct iscsi_np *np;
196 struct semaphore sem;
197 struct rdma_cm_id *cm_id;
198 struct mutex mutex;
199 struct list_head accepted;
200 struct list_head pending;
201};
202
