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 ISCSI_ISER_SG_TABLESIZE 256 35 #define ISER_FASTREG_LI_WRID 0xffffffffffffffffULL 36 #define ISER_BEACON_WRID 0xfffffffffffffffeULL 37 38 enum isert_desc_type { 39 ISCSI_TX_CONTROL, 40 ISCSI_TX_DATAIN 41 }; 42 43 enum iser_ib_op_code { 44 ISER_IB_RECV, 45 ISER_IB_SEND, 46 ISER_IB_RDMA_WRITE, 47 ISER_IB_RDMA_READ, 48 }; 49 50 enum iser_conn_state { 51 ISER_CONN_INIT, 52 ISER_CONN_UP, 53 ISER_CONN_FULL_FEATURE, 54 ISER_CONN_TERMINATING, 55 ISER_CONN_DOWN, 56 }; 57 58 struct iser_rx_desc { 59 struct iser_hdr iser_header; 60 struct iscsi_hdr iscsi_header; 61 char data[ISER_RECV_DATA_SEG_LEN]; 62 u64 dma_addr; 63 struct ib_sge rx_sg; 64 char pad[ISER_RX_PAD_SIZE]; 65 } __packed; 66 67 struct iser_tx_desc { 68 struct iser_hdr iser_header; 69 struct iscsi_hdr iscsi_header; 70 enum isert_desc_type type; 71 u64 dma_addr; 72 struct ib_sge tx_sg[2]; 73 int num_sge; 74 struct isert_cmd *isert_cmd; 75 struct ib_send_wr send_wr; 76 } __packed; 77 78 enum isert_indicator { 79 ISERT_PROTECTED = 1 << 0, 80 ISERT_DATA_KEY_VALID = 1 << 1, 81 ISERT_PROT_KEY_VALID = 1 << 2, 82 ISERT_SIG_KEY_VALID = 1 << 3, 83 }; 84 85 struct pi_context { 86 struct ib_mr *prot_mr; 87 struct ib_mr *sig_mr; 88 }; 89 90 struct fast_reg_descriptor { 91 struct list_head list; 92 struct ib_mr *data_mr; 93 u8 ind; 94 struct pi_context *pi_ctx; 95 }; 96 97 struct isert_data_buf { 98 struct scatterlist *sg; 99 int nents; 100 u32 sg_off; 101 u32 len; /* cur_rdma_length */ 102 u32 offset; 103 unsigned int dma_nents; 104 enum dma_data_direction dma_dir; 105 }; 106 107 enum { 108 DATA = 0, 109 PROT = 1, 110 SIG = 2, 111 }; 112 113 struct isert_rdma_wr { 114 struct isert_cmd *isert_cmd; 115 enum iser_ib_op_code iser_ib_op; 116 struct ib_sge *ib_sge; 117 struct ib_sge s_ib_sge; 118 int rdma_wr_num; 119 struct ib_rdma_wr *rdma_wr; 120 struct ib_rdma_wr s_rdma_wr; 121 struct ib_sge ib_sg[3]; 122 struct isert_data_buf data; 123 struct isert_data_buf prot; 124 struct fast_reg_descriptor *fr_desc; 125 }; 126 127 struct isert_cmd { 128 uint32_t read_stag; 129 uint32_t write_stag; 130 uint64_t read_va; 131 uint64_t write_va; 132 u64 pdu_buf_dma; 133 u32 pdu_buf_len; 134 struct isert_conn *conn; 135 struct iscsi_cmd *iscsi_cmd; 136 struct iser_tx_desc tx_desc; 137 struct iser_rx_desc *rx_desc; 138 struct isert_rdma_wr rdma_wr; 139 struct work_struct comp_work; 140 struct scatterlist sg; 141 }; 142 143 struct isert_device; 144 145 struct isert_conn { 146 enum iser_conn_state state; 147 int post_recv_buf_count; 148 u32 responder_resources; 149 u32 initiator_depth; 150 bool pi_support; 151 u32 max_sge; 152 char *login_buf; 153 char *login_req_buf; 154 char *login_rsp_buf; 155 u64 login_req_dma; 156 int login_req_len; 157 u64 login_rsp_dma; 158 struct iser_rx_desc *rx_descs; 159 struct ib_recv_wr rx_wr[ISERT_QP_MAX_RECV_DTOS]; 160 struct iscsi_conn *conn; 161 struct list_head node; 162 struct completion login_comp; 163 struct completion login_req_comp; 164 struct iser_tx_desc login_tx_desc; 165 struct rdma_cm_id *cm_id; 166 struct ib_qp *qp; 167 struct isert_device *device; 168 struct mutex mutex; 169 struct completion wait; 170 struct completion wait_comp_err; 171 struct kref kref; 172 struct list_head fr_pool; 173 int fr_pool_size; 174 /* lock to protect fastreg pool */ 175 spinlock_t pool_lock; 176 struct work_struct release_work; 177 struct ib_recv_wr beacon; 178 bool logout_posted; 179 }; 180 181 #define ISERT_MAX_CQ 64 182 183 /** 184 * struct isert_comp - iSER completion context 185 * 186 * @device: pointer to device handle 187 * @cq: completion queue 188 * @wcs: work completion array 189 * @active_qps: Number of active QPs attached 190 * to completion context 191 * @work: completion work handle 192 */ 193 struct isert_comp { 194 struct isert_device *device; 195 struct ib_cq *cq; 196 struct ib_wc wcs[16]; 197 int active_qps; 198 struct work_struct work; 199 }; 200 201 struct isert_device { 202 int use_fastreg; 203 bool pi_capable; 204 int refcount; 205 struct ib_device *ib_device; 206 struct ib_pd *pd; 207 struct isert_comp *comps; 208 int comps_used; 209 struct list_head dev_node; 210 struct ib_device_attr dev_attr; 211 int (*reg_rdma_mem)(struct iscsi_conn *conn, 212 struct iscsi_cmd *cmd, 213 struct isert_rdma_wr *wr); 214 void (*unreg_rdma_mem)(struct isert_cmd *isert_cmd, 215 struct isert_conn *isert_conn); 216 }; 217 218 struct isert_np { 219 struct iscsi_np *np; 220 struct semaphore sem; 221 struct rdma_cm_id *cm_id; 222 struct mutex mutex; 223 struct list_head accepted; 224 struct list_head pending; 225 }; 226