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 7 #define DRV_NAME "isert" 8 #define PFX DRV_NAME ": " 9 10 #define isert_dbg(fmt, arg...) \ 11 do { \ 12 if (unlikely(isert_debug_level > 2)) \ 13 printk(KERN_DEBUG PFX "%s: " fmt,\ 14 __func__ , ## arg); \ 15 } while (0) 16 17 #define isert_warn(fmt, arg...) \ 18 do { \ 19 if (unlikely(isert_debug_level > 0)) \ 20 pr_warn(PFX "%s: " fmt, \ 21 __func__ , ## arg); \ 22 } while (0) 23 24 #define isert_info(fmt, arg...) \ 25 do { \ 26 if (unlikely(isert_debug_level > 1)) \ 27 pr_info(PFX "%s: " fmt, \ 28 __func__ , ## arg); \ 29 } while (0) 30 31 #define isert_err(fmt, arg...) \ 32 pr_err(PFX "%s: " fmt, __func__ , ## arg) 33 34 #define ISERT_RDMA_LISTEN_BACKLOG 10 35 #define ISCSI_ISER_SG_TABLESIZE 256 36 #define ISER_FASTREG_LI_WRID 0xffffffffffffffffULL 37 #define ISER_BEACON_WRID 0xfffffffffffffffeULL 38 39 enum isert_desc_type { 40 ISCSI_TX_CONTROL, 41 ISCSI_TX_DATAIN 42 }; 43 44 enum iser_ib_op_code { 45 ISER_IB_RECV, 46 ISER_IB_SEND, 47 ISER_IB_RDMA_WRITE, 48 ISER_IB_RDMA_READ, 49 }; 50 51 enum iser_conn_state { 52 ISER_CONN_INIT, 53 ISER_CONN_UP, 54 ISER_CONN_FULL_FEATURE, 55 ISER_CONN_TERMINATING, 56 ISER_CONN_DOWN, 57 }; 58 59 struct iser_rx_desc { 60 struct iser_hdr iser_header; 61 struct iscsi_hdr iscsi_header; 62 char data[ISER_RECV_DATA_SEG_LEN]; 63 u64 dma_addr; 64 struct ib_sge rx_sg; 65 char pad[ISER_RX_PAD_SIZE]; 66 } __packed; 67 68 struct iser_tx_desc { 69 struct iser_hdr iser_header; 70 struct iscsi_hdr iscsi_header; 71 enum isert_desc_type type; 72 u64 dma_addr; 73 struct ib_sge tx_sg[2]; 74 int num_sge; 75 struct isert_cmd *isert_cmd; 76 struct ib_send_wr send_wr; 77 } __packed; 78 79 enum isert_indicator { 80 ISERT_PROTECTED = 1 << 0, 81 ISERT_DATA_KEY_VALID = 1 << 1, 82 ISERT_PROT_KEY_VALID = 1 << 2, 83 ISERT_SIG_KEY_VALID = 1 << 3, 84 }; 85 86 struct pi_context { 87 struct ib_mr *prot_mr; 88 struct ib_fast_reg_page_list *prot_frpl; 89 struct ib_mr *sig_mr; 90 }; 91 92 struct fast_reg_descriptor { 93 struct list_head list; 94 struct ib_mr *data_mr; 95 struct ib_fast_reg_page_list *data_frpl; 96 u8 ind; 97 struct pi_context *pi_ctx; 98 }; 99 100 struct isert_data_buf { 101 struct scatterlist *sg; 102 int nents; 103 u32 sg_off; 104 u32 len; /* cur_rdma_length */ 105 u32 offset; 106 unsigned int dma_nents; 107 enum dma_data_direction dma_dir; 108 }; 109 110 enum { 111 DATA = 0, 112 PROT = 1, 113 SIG = 2, 114 }; 115 116 struct isert_rdma_wr { 117 struct list_head wr_list; 118 struct isert_cmd *isert_cmd; 119 enum iser_ib_op_code iser_ib_op; 120 struct ib_sge *ib_sge; 121 struct ib_sge s_ib_sge; 122 int send_wr_num; 123 struct ib_send_wr *send_wr; 124 struct ib_send_wr s_send_wr; 125 struct ib_sge ib_sg[3]; 126 struct isert_data_buf data; 127 struct isert_data_buf prot; 128 struct fast_reg_descriptor *fr_desc; 129 }; 130 131 struct isert_cmd { 132 uint32_t read_stag; 133 uint32_t write_stag; 134 uint64_t read_va; 135 uint64_t write_va; 136 u64 pdu_buf_dma; 137 u32 pdu_buf_len; 138 u32 read_va_off; 139 u32 write_va_off; 140 u32 rdma_wr_num; 141 struct isert_conn *conn; 142 struct iscsi_cmd *iscsi_cmd; 143 struct iser_tx_desc tx_desc; 144 struct isert_rdma_wr rdma_wr; 145 struct work_struct comp_work; 146 }; 147 148 struct isert_device; 149 150 struct isert_conn { 151 enum iser_conn_state state; 152 int post_recv_buf_count; 153 u32 responder_resources; 154 u32 initiator_depth; 155 bool pi_support; 156 u32 max_sge; 157 char *login_buf; 158 char *login_req_buf; 159 char *login_rsp_buf; 160 u64 login_req_dma; 161 int login_req_len; 162 u64 login_rsp_dma; 163 unsigned int conn_rx_desc_head; 164 struct iser_rx_desc *conn_rx_descs; 165 struct ib_recv_wr conn_rx_wr[ISERT_MIN_POSTED_RX]; 166 struct iscsi_conn *conn; 167 struct list_head conn_accept_node; 168 struct completion conn_login_comp; 169 struct completion login_req_comp; 170 struct iser_tx_desc conn_login_tx_desc; 171 struct rdma_cm_id *conn_cm_id; 172 struct ib_pd *conn_pd; 173 struct ib_mr *conn_mr; 174 struct ib_qp *conn_qp; 175 struct isert_device *conn_device; 176 struct mutex conn_mutex; 177 struct completion conn_wait; 178 struct completion conn_wait_comp_err; 179 struct kref conn_kref; 180 struct list_head conn_fr_pool; 181 int conn_fr_pool_size; 182 /* lock to protect fastreg pool */ 183 spinlock_t conn_lock; 184 struct work_struct release_work; 185 struct ib_recv_wr beacon; 186 bool logout_posted; 187 }; 188 189 #define ISERT_MAX_CQ 64 190 191 /** 192 * struct isert_comp - iSER completion context 193 * 194 * @device: pointer to device handle 195 * @cq: completion queue 196 * @wcs: work completion array 197 * @active_qps: Number of active QPs attached 198 * to completion context 199 * @work: completion work handle 200 */ 201 struct isert_comp { 202 struct isert_device *device; 203 struct ib_cq *cq; 204 struct ib_wc wcs[16]; 205 int active_qps; 206 struct work_struct work; 207 }; 208 209 struct isert_device { 210 int use_fastreg; 211 bool pi_capable; 212 int refcount; 213 struct ib_device *ib_device; 214 struct isert_comp *comps; 215 int comps_used; 216 struct list_head dev_node; 217 struct ib_device_attr dev_attr; 218 int (*reg_rdma_mem)(struct iscsi_conn *conn, 219 struct iscsi_cmd *cmd, 220 struct isert_rdma_wr *wr); 221 void (*unreg_rdma_mem)(struct isert_cmd *isert_cmd, 222 struct isert_conn *isert_conn); 223 }; 224 225 struct isert_np { 226 struct iscsi_np *np; 227 struct semaphore np_sem; 228 struct rdma_cm_id *np_cm_id; 229 struct mutex np_accept_mutex; 230 struct list_head np_accept_list; 231 struct completion np_login_comp; 232 }; 233