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 /* Maximum support is 16MB I/O size */ 69 #define ISCSI_ISER_MAX_SG_TABLESIZE 4096 70 71 enum isert_desc_type { 72 ISCSI_TX_CONTROL, 73 ISCSI_TX_DATAIN 74 }; 75 76 enum iser_conn_state { 77 ISER_CONN_INIT, 78 ISER_CONN_UP, 79 ISER_CONN_BOUND, 80 ISER_CONN_FULL_FEATURE, 81 ISER_CONN_TERMINATING, 82 ISER_CONN_DOWN, 83 }; 84 85 struct iser_rx_desc { 86 char buf[ISER_RX_SIZE]; 87 u64 dma_addr; 88 struct ib_sge rx_sg; 89 struct ib_cqe rx_cqe; 90 bool in_use; 91 }; 92 93 static 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 98 static void *isert_get_iser_hdr(struct iser_rx_desc *desc) 99 { 100 return PTR_ALIGN(desc->buf + ISER_HEADERS_LEN, 512) - ISER_HEADERS_LEN; 101 } 102 103 static size_t isert_get_hdr_offset(struct iser_rx_desc *desc) 104 { 105 return isert_get_iser_hdr(desc) - (void *)desc->buf; 106 } 107 108 static void *isert_get_iscsi_hdr(struct iser_rx_desc *desc) 109 { 110 return isert_get_iser_hdr(desc) + sizeof(struct iser_ctrl); 111 } 112 113 static void *isert_get_data(struct iser_rx_desc *desc) 114 { 115 void *data = isert_get_iser_hdr(desc) + ISER_HEADERS_LEN; 116 117 WARN_ON((uintptr_t)data & 511); 118 return data; 119 } 120 121 struct iser_tx_desc { 122 struct iser_ctrl iser_header; 123 struct iscsi_hdr iscsi_header; 124 enum isert_desc_type type; 125 u64 dma_addr; 126 struct ib_sge tx_sg[2]; 127 struct ib_cqe tx_cqe; 128 int num_sge; 129 struct ib_send_wr send_wr; 130 } __packed; 131 132 static inline struct iser_tx_desc *cqe_to_tx_desc(struct ib_cqe *cqe) 133 { 134 return container_of(cqe, struct iser_tx_desc, tx_cqe); 135 } 136 137 struct isert_cmd { 138 uint32_t read_stag; 139 uint32_t write_stag; 140 uint64_t read_va; 141 uint64_t write_va; 142 uint32_t inv_rkey; 143 u64 pdu_buf_dma; 144 u32 pdu_buf_len; 145 struct isert_conn *conn; 146 struct iscsi_cmd *iscsi_cmd; 147 struct iser_tx_desc tx_desc; 148 struct iser_rx_desc *rx_desc; 149 struct rdma_rw_ctx rw; 150 struct work_struct comp_work; 151 struct scatterlist sg; 152 bool ctx_init_done; 153 }; 154 155 static inline struct isert_cmd *tx_desc_to_cmd(struct iser_tx_desc *desc) 156 { 157 return container_of(desc, struct isert_cmd, tx_desc); 158 } 159 160 struct isert_device; 161 162 struct isert_conn { 163 enum iser_conn_state state; 164 u32 responder_resources; 165 u32 initiator_depth; 166 bool pi_support; 167 struct iser_rx_desc *login_desc; 168 char *login_rsp_buf; 169 int login_req_len; 170 u64 login_rsp_dma; 171 struct iser_rx_desc *rx_descs; 172 struct ib_recv_wr rx_wr[ISERT_QP_MAX_RECV_DTOS]; 173 struct iscsi_conn *conn; 174 struct list_head node; 175 struct completion login_comp; 176 struct completion login_req_comp; 177 struct iser_tx_desc login_tx_desc; 178 struct rdma_cm_id *cm_id; 179 struct ib_qp *qp; 180 struct ib_cq *cq; 181 u32 cq_size; 182 struct isert_device *device; 183 struct mutex mutex; 184 struct kref kref; 185 struct work_struct release_work; 186 bool logout_posted; 187 bool snd_w_inv; 188 wait_queue_head_t rem_wait; 189 bool dev_removed; 190 }; 191 192 struct isert_device { 193 bool pi_capable; 194 int refcount; 195 struct ib_device *ib_device; 196 struct ib_pd *pd; 197 struct isert_comp *comps; 198 int comps_used; 199 struct list_head dev_node; 200 }; 201 202 struct isert_np { 203 struct iscsi_np *np; 204 struct semaphore sem; 205 struct rdma_cm_id *cm_id; 206 struct mutex mutex; 207 struct list_head accepted; 208 struct list_head pending; 209 }; 210