1 /* SPDX-License-Identifier: GPL-2.0 */
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 /* Constant PDU lengths calculations */
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 /* QP settings */
44 /* Maximal bounds on received asynchronous PDUs */
45 #define ISERT_MAX_TX_MISC_PDUS 4 /* NOOP_IN(2) , ASYNC_EVENT(2) */
46
47 #define ISERT_MAX_RX_MISC_PDUS 6 /*
48 * NOOP_OUT(2), TEXT(1),
49 * SCSI_TMFUNC(2), LOGOUT(1)
50 */
51
52 #define ISCSI_DEF_XMIT_CMDS_MAX 128 /* from libiscsi.h, must be power of 2 */
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 * RX size is default of 8k plus headers, but data needs to align to
64 * 512 boundary, so use 1024 to have the extra space for alignment.
65 */
66 #define ISER_RX_SIZE (ISCSI_DEF_MAX_RECV_SEG_LEN + 1024)
67
68 /* Minimum I/O size is 512KB */
69 #define ISCSI_ISER_MIN_SG_TABLESIZE 128
70
71 /* Maximum support is 16MB I/O size */
72 #define ISCSI_ISER_MAX_SG_TABLESIZE 4096
73
74 enum isert_desc_type {
75 ISCSI_TX_CONTROL,
76 ISCSI_TX_DATAIN
77 };
78
79 enum iser_conn_state {
80 ISER_CONN_INIT,
81 ISER_CONN_UP,
82 ISER_CONN_BOUND,
83 ISER_CONN_FULL_FEATURE,
84 ISER_CONN_TERMINATING,
85 ISER_CONN_DOWN,
86 };
87
88 struct iser_rx_desc {
89 char buf[ISER_RX_SIZE];
90 u64 dma_addr;
91 struct ib_sge rx_sg;
92 struct ib_cqe rx_cqe;
93 bool in_use;
94 };
95
cqe_to_rx_desc(struct ib_cqe * cqe)96 static inline struct iser_rx_desc *cqe_to_rx_desc(struct ib_cqe *cqe)
97 {
98 return container_of(cqe, struct iser_rx_desc, rx_cqe);
99 }
100
isert_get_iser_hdr(struct iser_rx_desc * desc)101 static void *isert_get_iser_hdr(struct iser_rx_desc *desc)
102 {
103 return PTR_ALIGN(desc->buf + ISER_HEADERS_LEN, 512) - ISER_HEADERS_LEN;
104 }
105
isert_get_hdr_offset(struct iser_rx_desc * desc)106 static size_t isert_get_hdr_offset(struct iser_rx_desc *desc)
107 {
108 return isert_get_iser_hdr(desc) - (void *)desc->buf;
109 }
110
isert_get_iscsi_hdr(struct iser_rx_desc * desc)111 static void *isert_get_iscsi_hdr(struct iser_rx_desc *desc)
112 {
113 return isert_get_iser_hdr(desc) + sizeof(struct iser_ctrl);
114 }
115
isert_get_data(struct iser_rx_desc * desc)116 static void *isert_get_data(struct iser_rx_desc *desc)
117 {
118 void *data = isert_get_iser_hdr(desc) + ISER_HEADERS_LEN;
119
120 WARN_ON((uintptr_t)data & 511);
121 return data;
122 }
123
124 struct iser_tx_desc {
125 struct iser_ctrl iser_header;
126 struct iscsi_hdr iscsi_header;
127 enum isert_desc_type type;
128 u64 dma_addr;
129 struct ib_sge tx_sg[2];
130 struct ib_cqe tx_cqe;
131 int num_sge;
132 struct ib_send_wr send_wr;
133 } __packed;
134
cqe_to_tx_desc(struct ib_cqe * cqe)135 static inline struct iser_tx_desc *cqe_to_tx_desc(struct ib_cqe *cqe)
136 {
137 return container_of(cqe, struct iser_tx_desc, tx_cqe);
138 }
139
140 struct isert_cmd {
141 uint32_t read_stag;
142 uint32_t write_stag;
143 uint64_t read_va;
144 uint64_t write_va;
145 uint32_t inv_rkey;
146 u64 pdu_buf_dma;
147 u32 pdu_buf_len;
148 struct isert_conn *conn;
149 struct iscsit_cmd *iscsit_cmd;
150 struct iser_tx_desc tx_desc;
151 struct iser_rx_desc *rx_desc;
152 struct rdma_rw_ctx rw;
153 struct work_struct comp_work;
154 struct scatterlist sg;
155 bool ctx_init_done;
156 };
157
tx_desc_to_cmd(struct iser_tx_desc * desc)158 static inline struct isert_cmd *tx_desc_to_cmd(struct iser_tx_desc *desc)
159 {
160 return container_of(desc, struct isert_cmd, tx_desc);
161 }
162
163 struct isert_device;
164
165 struct isert_conn {
166 enum iser_conn_state state;
167 u32 responder_resources;
168 u32 initiator_depth;
169 bool pi_support;
170 struct iser_rx_desc *login_desc;
171 char *login_rsp_buf;
172 int login_req_len;
173 u64 login_rsp_dma;
174 struct iser_rx_desc *rx_descs;
175 struct ib_recv_wr rx_wr[ISERT_QP_MAX_RECV_DTOS];
176 struct iscsit_conn *conn;
177 struct list_head node;
178 struct completion login_comp;
179 struct completion login_req_comp;
180 struct iser_tx_desc login_tx_desc;
181 struct rdma_cm_id *cm_id;
182 struct ib_qp *qp;
183 struct ib_cq *cq;
184 u32 cq_size;
185 struct isert_device *device;
186 struct mutex mutex;
187 struct kref kref;
188 struct work_struct release_work;
189 bool logout_posted;
190 bool snd_w_inv;
191 wait_queue_head_t rem_wait;
192 bool dev_removed;
193 };
194
195 struct isert_device {
196 bool pi_capable;
197 int refcount;
198 struct ib_device *ib_device;
199 struct ib_pd *pd;
200 struct isert_comp *comps;
201 int comps_used;
202 struct list_head dev_node;
203 };
204
205 struct isert_np {
206 struct iscsi_np *np;
207 struct semaphore sem;
208 struct rdma_cm_id *cm_id;
209 struct mutex mutex;
210 struct list_head accepted;
211 struct list_head pending;
212 };
213