1 #include <linux/socket.h> 2 #include <linux/in.h> 3 #include <linux/in6.h> 4 #include <rdma/ib_verbs.h> 5 #include <rdma/rdma_cm.h> 6 #include <rdma/rw.h> 7 #include <scsi/iser.h> 8 9 10 #define DRV_NAME "isert" 11 #define PFX DRV_NAME ": " 12 13 #define isert_dbg(fmt, arg...) \ 14 do { \ 15 if (unlikely(isert_debug_level > 2)) \ 16 printk(KERN_DEBUG PFX "%s: " fmt,\ 17 __func__ , ## arg); \ 18 } while (0) 19 20 #define isert_warn(fmt, arg...) \ 21 do { \ 22 if (unlikely(isert_debug_level > 0)) \ 23 pr_warn(PFX "%s: " fmt, \ 24 __func__ , ## arg); \ 25 } while (0) 26 27 #define isert_info(fmt, arg...) \ 28 do { \ 29 if (unlikely(isert_debug_level > 1)) \ 30 pr_info(PFX "%s: " fmt, \ 31 __func__ , ## arg); \ 32 } while (0) 33 34 #define isert_err(fmt, arg...) \ 35 pr_err(PFX "%s: " fmt, __func__ , ## arg) 36 37 /* Constant PDU lengths calculations */ 38 #define ISER_HEADERS_LEN (sizeof(struct iser_ctrl) + \ 39 sizeof(struct iscsi_hdr)) 40 #define ISER_RX_PAYLOAD_SIZE (ISER_HEADERS_LEN + ISCSI_DEF_MAX_RECV_SEG_LEN) 41 42 /* QP settings */ 43 /* Maximal bounds on received asynchronous PDUs */ 44 #define ISERT_MAX_TX_MISC_PDUS 4 /* NOOP_IN(2) , ASYNC_EVENT(2) */ 45 46 #define ISERT_MAX_RX_MISC_PDUS 6 /* 47 * NOOP_OUT(2), TEXT(1), 48 * SCSI_TMFUNC(2), LOGOUT(1) 49 */ 50 51 #define ISCSI_DEF_XMIT_CMDS_MAX 128 /* from libiscsi.h, must be power of 2 */ 52 53 #define ISERT_QP_MAX_RECV_DTOS (ISCSI_DEF_XMIT_CMDS_MAX) 54 55 #define ISERT_MIN_POSTED_RX (ISCSI_DEF_XMIT_CMDS_MAX >> 2) 56 57 #define ISERT_QP_MAX_REQ_DTOS (ISCSI_DEF_XMIT_CMDS_MAX + \ 58 ISERT_MAX_TX_MISC_PDUS + \ 59 ISERT_MAX_RX_MISC_PDUS) 60 61 #define ISER_RX_PAD_SIZE (ISCSI_DEF_MAX_RECV_SEG_LEN + 4096 - \ 62 (ISER_RX_PAYLOAD_SIZE + sizeof(u64) + sizeof(struct ib_sge) + \ 63 sizeof(struct ib_cqe))) 64 65 #define ISCSI_ISER_SG_TABLESIZE 256 66 67 enum isert_desc_type { 68 ISCSI_TX_CONTROL, 69 ISCSI_TX_DATAIN 70 }; 71 72 enum iser_conn_state { 73 ISER_CONN_INIT, 74 ISER_CONN_UP, 75 ISER_CONN_BOUND, 76 ISER_CONN_FULL_FEATURE, 77 ISER_CONN_TERMINATING, 78 ISER_CONN_DOWN, 79 }; 80 81 struct iser_rx_desc { 82 struct iser_ctrl iser_header; 83 struct iscsi_hdr iscsi_header; 84 char data[ISCSI_DEF_MAX_RECV_SEG_LEN]; 85 u64 dma_addr; 86 struct ib_sge rx_sg; 87 struct ib_cqe rx_cqe; 88 char pad[ISER_RX_PAD_SIZE]; 89 } __packed; 90 91 static inline struct iser_rx_desc *cqe_to_rx_desc(struct ib_cqe *cqe) 92 { 93 return container_of(cqe, struct iser_rx_desc, rx_cqe); 94 } 95 96 struct iser_tx_desc { 97 struct iser_ctrl iser_header; 98 struct iscsi_hdr iscsi_header; 99 enum isert_desc_type type; 100 u64 dma_addr; 101 struct ib_sge tx_sg[2]; 102 struct ib_cqe tx_cqe; 103 int num_sge; 104 struct ib_send_wr send_wr; 105 } __packed; 106 107 static inline struct iser_tx_desc *cqe_to_tx_desc(struct ib_cqe *cqe) 108 { 109 return container_of(cqe, struct iser_tx_desc, tx_cqe); 110 } 111 112 struct isert_cmd { 113 uint32_t read_stag; 114 uint32_t write_stag; 115 uint64_t read_va; 116 uint64_t write_va; 117 uint32_t inv_rkey; 118 u64 pdu_buf_dma; 119 u32 pdu_buf_len; 120 struct isert_conn *conn; 121 struct iscsi_cmd *iscsi_cmd; 122 struct iser_tx_desc tx_desc; 123 struct iser_rx_desc *rx_desc; 124 struct rdma_rw_ctx rw; 125 struct work_struct comp_work; 126 struct scatterlist sg; 127 }; 128 129 static inline struct isert_cmd *tx_desc_to_cmd(struct iser_tx_desc *desc) 130 { 131 return container_of(desc, struct isert_cmd, tx_desc); 132 } 133 134 struct isert_device; 135 136 struct isert_conn { 137 enum iser_conn_state state; 138 u32 responder_resources; 139 u32 initiator_depth; 140 bool pi_support; 141 u32 max_sge; 142 struct iser_rx_desc *login_req_buf; 143 char *login_rsp_buf; 144 u64 login_req_dma; 145 int login_req_len; 146 u64 login_rsp_dma; 147 struct iser_rx_desc *rx_descs; 148 struct ib_recv_wr rx_wr[ISERT_QP_MAX_RECV_DTOS]; 149 struct iscsi_conn *conn; 150 struct list_head node; 151 struct completion login_comp; 152 struct completion login_req_comp; 153 struct iser_tx_desc login_tx_desc; 154 struct rdma_cm_id *cm_id; 155 struct ib_qp *qp; 156 struct isert_device *device; 157 struct mutex mutex; 158 struct kref kref; 159 struct work_struct release_work; 160 bool logout_posted; 161 bool snd_w_inv; 162 }; 163 164 #define ISERT_MAX_CQ 64 165 166 /** 167 * struct isert_comp - iSER completion context 168 * 169 * @device: pointer to device handle 170 * @cq: completion queue 171 * @active_qps: Number of active QPs attached 172 * to completion context 173 */ 174 struct isert_comp { 175 struct isert_device *device; 176 struct ib_cq *cq; 177 int active_qps; 178 }; 179 180 struct isert_device { 181 bool pi_capable; 182 int refcount; 183 struct ib_device *ib_device; 184 struct ib_pd *pd; 185 struct isert_comp *comps; 186 int comps_used; 187 struct list_head dev_node; 188 }; 189 190 struct isert_np { 191 struct iscsi_np *np; 192 struct semaphore sem; 193 struct rdma_cm_id *cm_id; 194 struct mutex mutex; 195 struct list_head accepted; 196 struct list_head pending; 197 }; 198