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 #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 /* Maximum support is 16MB I/O size */ 67 #define ISCSI_ISER_MAX_SG_TABLESIZE 4096 68 69 enum isert_desc_type { 70 ISCSI_TX_CONTROL, 71 ISCSI_TX_DATAIN 72 }; 73 74 enum iser_conn_state { 75 ISER_CONN_INIT, 76 ISER_CONN_UP, 77 ISER_CONN_BOUND, 78 ISER_CONN_FULL_FEATURE, 79 ISER_CONN_TERMINATING, 80 ISER_CONN_DOWN, 81 }; 82 83 struct iser_rx_desc { 84 struct iser_ctrl iser_header; 85 struct iscsi_hdr iscsi_header; 86 char data[ISCSI_DEF_MAX_RECV_SEG_LEN]; 87 u64 dma_addr; 88 struct ib_sge rx_sg; 89 struct ib_cqe rx_cqe; 90 bool in_use; 91 char pad[ISER_RX_PAD_SIZE]; 92 } __packed; 93 94 static inline struct iser_rx_desc *cqe_to_rx_desc(struct ib_cqe *cqe) 95 { 96 return container_of(cqe, struct iser_rx_desc, rx_cqe); 97 } 98 99 struct iser_tx_desc { 100 struct iser_ctrl iser_header; 101 struct iscsi_hdr iscsi_header; 102 enum isert_desc_type type; 103 u64 dma_addr; 104 struct ib_sge tx_sg[2]; 105 struct ib_cqe tx_cqe; 106 int num_sge; 107 struct ib_send_wr send_wr; 108 } __packed; 109 110 static inline struct iser_tx_desc *cqe_to_tx_desc(struct ib_cqe *cqe) 111 { 112 return container_of(cqe, struct iser_tx_desc, tx_cqe); 113 } 114 115 struct isert_cmd { 116 uint32_t read_stag; 117 uint32_t write_stag; 118 uint64_t read_va; 119 uint64_t write_va; 120 uint32_t inv_rkey; 121 u64 pdu_buf_dma; 122 u32 pdu_buf_len; 123 struct isert_conn *conn; 124 struct iscsi_cmd *iscsi_cmd; 125 struct iser_tx_desc tx_desc; 126 struct iser_rx_desc *rx_desc; 127 struct rdma_rw_ctx rw; 128 struct work_struct comp_work; 129 struct scatterlist sg; 130 bool ctx_init_done; 131 }; 132 133 static inline struct isert_cmd *tx_desc_to_cmd(struct iser_tx_desc *desc) 134 { 135 return container_of(desc, struct isert_cmd, tx_desc); 136 } 137 138 struct isert_device; 139 140 struct isert_conn { 141 enum iser_conn_state state; 142 u32 responder_resources; 143 u32 initiator_depth; 144 bool pi_support; 145 struct iser_rx_desc *login_req_buf; 146 char *login_rsp_buf; 147 u64 login_req_dma; 148 int login_req_len; 149 u64 login_rsp_dma; 150 struct iser_rx_desc *rx_descs; 151 struct ib_recv_wr rx_wr[ISERT_QP_MAX_RECV_DTOS]; 152 struct iscsi_conn *conn; 153 struct list_head node; 154 struct completion login_comp; 155 struct completion login_req_comp; 156 struct iser_tx_desc login_tx_desc; 157 struct rdma_cm_id *cm_id; 158 struct ib_qp *qp; 159 struct ib_cq *cq; 160 u32 cq_size; 161 struct isert_device *device; 162 struct mutex mutex; 163 struct kref kref; 164 struct work_struct release_work; 165 bool logout_posted; 166 bool snd_w_inv; 167 wait_queue_head_t rem_wait; 168 bool dev_removed; 169 }; 170 171 struct isert_device { 172 bool pi_capable; 173 int refcount; 174 struct ib_device *ib_device; 175 struct ib_pd *pd; 176 struct isert_comp *comps; 177 int comps_used; 178 struct list_head dev_node; 179 }; 180 181 struct isert_np { 182 struct iscsi_np *np; 183 struct semaphore sem; 184 struct rdma_cm_id *cm_id; 185 struct mutex mutex; 186 struct list_head accepted; 187 struct list_head pending; 188 }; 189