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 /* Default I/O size is 1MB */ 69 #define ISCSI_ISER_DEF_SG_TABLESIZE 256 70 71 /* Minimum I/O size is 512KB */ 72 #define ISCSI_ISER_MIN_SG_TABLESIZE 128 73 74 /* Maximum support is 16MB I/O size */ 75 #define ISCSI_ISER_MAX_SG_TABLESIZE 4096 76 77 enum isert_desc_type { 78 ISCSI_TX_CONTROL, 79 ISCSI_TX_DATAIN 80 }; 81 82 enum 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 91 struct 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 99 static 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 } 103 104 static 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 } 108 109 static size_t isert_get_hdr_offset(struct iser_rx_desc *desc) 110 { 111 return isert_get_iser_hdr(desc) - (void *)desc->buf; 112 } 113 114 static void *isert_get_iscsi_hdr(struct iser_rx_desc *desc) 115 { 116 return isert_get_iser_hdr(desc) + sizeof(struct iser_ctrl); 117 } 118 119 static 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 } 126 127 struct 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; 137 138 static 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 } 142 143 struct 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 }; 160 161 static 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 } 165 166 struct isert_device; 167 168 struct 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 }; 197 198 struct 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 }; 207 208 struct 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