1 /* 2 * QLogic iSCSI Offload Driver 3 * Copyright (c) 2016 Cavium Inc. 4 * 5 * This software is available under the terms of the GNU General Public License 6 * (GPL) Version 2, available from the file COPYING in the main directory of 7 * this source tree. 8 */ 9 10 #ifndef _QEDI_ISCSI_H_ 11 #define _QEDI_ISCSI_H_ 12 13 #include <linux/socket.h> 14 #include <linux/completion.h> 15 #include "qedi.h" 16 17 #define ISCSI_MAX_SESS_PER_HBA 4096 18 19 #define DEF_KA_TIMEOUT 7200000 20 #define DEF_KA_INTERVAL 10000 21 #define DEF_KA_MAX_PROBE_COUNT 10 22 #define DEF_TOS 0 23 #define DEF_TTL 0xfe 24 #define DEF_SND_SEQ_SCALE 0 25 #define DEF_RCV_BUF 0xffff 26 #define DEF_SND_BUF 0xffff 27 #define DEF_SEED 0 28 #define DEF_MAX_RT_TIME 8000 29 #define DEF_MAX_DA_COUNT 2 30 #define DEF_SWS_TIMER 1000 31 #define DEF_MAX_CWND 2 32 #define DEF_PATH_MTU 1500 33 #define DEF_MSS 1460 34 #define DEF_LL2_MTU 1560 35 #define JUMBO_MTU 9000 36 37 #define MIN_MTU 576 /* rfc 793 */ 38 #define IPV4_HDR_LEN 20 39 #define IPV6_HDR_LEN 40 40 #define TCP_HDR_LEN 20 41 #define TCP_OPTION_LEN 12 42 #define VLAN_LEN 4 43 44 enum { 45 EP_STATE_IDLE = 0x0, 46 EP_STATE_ACQRCONN_START = 0x1, 47 EP_STATE_ACQRCONN_COMPL = 0x2, 48 EP_STATE_OFLDCONN_START = 0x4, 49 EP_STATE_OFLDCONN_COMPL = 0x8, 50 EP_STATE_DISCONN_START = 0x10, 51 EP_STATE_DISCONN_COMPL = 0x20, 52 EP_STATE_CLEANUP_START = 0x40, 53 EP_STATE_CLEANUP_CMPL = 0x80, 54 EP_STATE_TCP_FIN_RCVD = 0x100, 55 EP_STATE_TCP_RST_RCVD = 0x200, 56 EP_STATE_LOGOUT_SENT = 0x400, 57 EP_STATE_LOGOUT_RESP_RCVD = 0x800, 58 EP_STATE_CLEANUP_FAILED = 0x1000, 59 EP_STATE_OFLDCONN_FAILED = 0x2000, 60 EP_STATE_CONNECT_FAILED = 0x4000, 61 EP_STATE_DISCONN_TIMEDOUT = 0x8000, 62 EP_STATE_OFLDCONN_NONE = 0x10000, 63 }; 64 65 struct qedi_conn; 66 67 struct qedi_endpoint { 68 struct qedi_ctx *qedi; 69 u32 dst_addr[4]; 70 u32 src_addr[4]; 71 u16 src_port; 72 u16 dst_port; 73 u16 vlan_id; 74 u16 pmtu; 75 u8 src_mac[ETH_ALEN]; 76 u8 dst_mac[ETH_ALEN]; 77 u8 ip_type; 78 int state; 79 wait_queue_head_t ofld_wait; 80 wait_queue_head_t tcp_ofld_wait; 81 u32 iscsi_cid; 82 /* identifier of the connection from qed */ 83 u32 handle; 84 u32 fw_cid; 85 void __iomem *p_doorbell; 86 87 /* Send queue management */ 88 struct iscsi_wqe *sq; 89 dma_addr_t sq_dma; 90 91 u16 sq_prod_idx; 92 u16 fw_sq_prod_idx; 93 u16 sq_con_idx; 94 u32 sq_mem_size; 95 96 void *sq_pbl; 97 dma_addr_t sq_pbl_dma; 98 u32 sq_pbl_size; 99 struct qedi_conn *conn; 100 struct work_struct offload_work; 101 }; 102 103 #define QEDI_SQ_WQES_MIN 16 104 105 struct qedi_io_bdt { 106 struct scsi_sge *sge_tbl; 107 dma_addr_t sge_tbl_dma; 108 u16 sge_valid; 109 }; 110 111 /** 112 * struct generic_pdu_resc - login pdu resource structure 113 * 114 * @req_buf: driver buffer used to stage payload associated with 115 * the login request 116 * @req_dma_addr: dma address for iscsi login request payload buffer 117 * @req_buf_size: actual login request payload length 118 * @req_wr_ptr: pointer into login request buffer when next data is 119 * to be written 120 * @resp_hdr: iscsi header where iscsi login response header is to 121 * be recreated 122 * @resp_buf: buffer to stage login response payload 123 * @resp_dma_addr: login response payload buffer dma address 124 * @resp_buf_size: login response paylod length 125 * @resp_wr_ptr: pointer into login response buffer when next data is 126 * to be written 127 * @req_bd_tbl: iscsi login request payload BD table 128 * @req_bd_dma: login request BD table dma address 129 * @resp_bd_tbl: iscsi login response payload BD table 130 * @resp_bd_dma: login request BD table dma address 131 * 132 * following structure defines buffer info for generic pdus such as iSCSI Login, 133 * Logout and NOP 134 */ 135 struct generic_pdu_resc { 136 char *req_buf; 137 dma_addr_t req_dma_addr; 138 u32 req_buf_size; 139 char *req_wr_ptr; 140 struct iscsi_hdr resp_hdr; 141 char *resp_buf; 142 dma_addr_t resp_dma_addr; 143 u32 resp_buf_size; 144 char *resp_wr_ptr; 145 char *req_bd_tbl; 146 dma_addr_t req_bd_dma; 147 char *resp_bd_tbl; 148 dma_addr_t resp_bd_dma; 149 }; 150 151 struct qedi_conn { 152 struct iscsi_cls_conn *cls_conn; 153 struct qedi_ctx *qedi; 154 struct qedi_endpoint *ep; 155 struct list_head active_cmd_list; 156 spinlock_t list_lock; /* internal conn lock */ 157 u32 active_cmd_count; 158 u32 cmd_cleanup_req; 159 u32 cmd_cleanup_cmpl; 160 161 u32 iscsi_conn_id; 162 int itt; 163 int abrt_conn; 164 #define QEDI_CID_RESERVED 0x5AFF 165 u32 fw_cid; 166 /* 167 * Buffer for login negotiation process 168 */ 169 struct generic_pdu_resc gen_pdu; 170 171 struct list_head tmf_work_list; 172 wait_queue_head_t wait_queue; 173 spinlock_t tmf_work_lock; /* tmf work lock */ 174 unsigned long flags; 175 #define QEDI_CONN_FW_CLEANUP 1 176 }; 177 178 struct qedi_cmd { 179 struct list_head io_cmd; 180 bool io_cmd_in_list; 181 struct iscsi_hdr hdr; 182 struct qedi_conn *conn; 183 struct scsi_cmnd *scsi_cmd; 184 struct scatterlist *sg; 185 struct qedi_io_bdt io_tbl; 186 struct e4_iscsi_task_context request; 187 unsigned char *sense_buffer; 188 dma_addr_t sense_buffer_dma; 189 u16 task_id; 190 191 /* field populated for tmf work queue */ 192 struct iscsi_task *task; 193 struct work_struct tmf_work; 194 int state; 195 #define CLEANUP_WAIT 1 196 #define CLEANUP_RECV 2 197 #define CLEANUP_WAIT_FAILED 3 198 #define CLEANUP_NOT_REQUIRED 4 199 #define LUN_RESET_RESPONSE_RECEIVED 5 200 #define RESPONSE_RECEIVED 6 201 202 int type; 203 #define TYPEIO 1 204 #define TYPERESET 2 205 206 struct qedi_work_map *list_tmf_work; 207 /* slowpath management */ 208 bool use_slowpath; 209 210 struct iscsi_tm_rsp *tmf_resp_buf; 211 struct qedi_work cqe_work; 212 }; 213 214 struct qedi_work_map { 215 struct list_head list; 216 struct qedi_cmd *qedi_cmd; 217 int rtid; 218 219 int state; 220 #define QEDI_WORK_QUEUED 1 221 #define QEDI_WORK_SCHEDULED 2 222 #define QEDI_WORK_EXIT 3 223 224 struct work_struct *ptr_tmf_work; 225 }; 226 227 struct qedi_boot_target { 228 char ip_addr[64]; 229 char iscsi_name[255]; 230 u32 ipv6_en; 231 }; 232 233 #define qedi_set_itt(task_id, itt) ((u32)(((task_id) & 0xffff) | ((itt) << 16))) 234 #define qedi_get_itt(cqe) (cqe.iscsi_hdr.cmd.itt >> 16) 235 236 #define QEDI_OFLD_WAIT_STATE(q) ((q)->state == EP_STATE_OFLDCONN_FAILED || \ 237 (q)->state == EP_STATE_OFLDCONN_COMPL) 238 239 #endif /* _QEDI_ISCSI_H_ */ 240