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 }; 63 64 struct qedi_conn; 65 66 struct qedi_endpoint { 67 struct qedi_ctx *qedi; 68 u32 dst_addr[4]; 69 u32 src_addr[4]; 70 u16 src_port; 71 u16 dst_port; 72 u16 vlan_id; 73 u16 pmtu; 74 u8 src_mac[ETH_ALEN]; 75 u8 dst_mac[ETH_ALEN]; 76 u8 ip_type; 77 int state; 78 wait_queue_head_t ofld_wait; 79 wait_queue_head_t tcp_ofld_wait; 80 u32 iscsi_cid; 81 /* identifier of the connection from qed */ 82 u32 handle; 83 u32 fw_cid; 84 void __iomem *p_doorbell; 85 86 /* Send queue management */ 87 struct iscsi_wqe *sq; 88 dma_addr_t sq_dma; 89 90 u16 sq_prod_idx; 91 u16 fw_sq_prod_idx; 92 u16 sq_con_idx; 93 u32 sq_mem_size; 94 95 void *sq_pbl; 96 dma_addr_t sq_pbl_dma; 97 u32 sq_pbl_size; 98 struct qedi_conn *conn; 99 struct work_struct offload_work; 100 }; 101 102 #define QEDI_SQ_WQES_MIN 16 103 104 struct qedi_io_bdt { 105 struct scsi_sge *sge_tbl; 106 dma_addr_t sge_tbl_dma; 107 u16 sge_valid; 108 }; 109 110 /** 111 * struct generic_pdu_resc - login pdu resource structure 112 * 113 * @req_buf: driver buffer used to stage payload associated with 114 * the login request 115 * @req_dma_addr: dma address for iscsi login request payload buffer 116 * @req_buf_size: actual login request payload length 117 * @req_wr_ptr: pointer into login request buffer when next data is 118 * to be written 119 * @resp_hdr: iscsi header where iscsi login response header is to 120 * be recreated 121 * @resp_buf: buffer to stage login response payload 122 * @resp_dma_addr: login response payload buffer dma address 123 * @resp_buf_size: login response paylod length 124 * @resp_wr_ptr: pointer into login response buffer when next data is 125 * to be written 126 * @req_bd_tbl: iscsi login request payload BD table 127 * @req_bd_dma: login request BD table dma address 128 * @resp_bd_tbl: iscsi login response payload BD table 129 * @resp_bd_dma: login request BD table dma address 130 * 131 * following structure defines buffer info for generic pdus such as iSCSI Login, 132 * Logout and NOP 133 */ 134 struct generic_pdu_resc { 135 char *req_buf; 136 dma_addr_t req_dma_addr; 137 u32 req_buf_size; 138 char *req_wr_ptr; 139 struct iscsi_hdr resp_hdr; 140 char *resp_buf; 141 dma_addr_t resp_dma_addr; 142 u32 resp_buf_size; 143 char *resp_wr_ptr; 144 char *req_bd_tbl; 145 dma_addr_t req_bd_dma; 146 char *resp_bd_tbl; 147 dma_addr_t resp_bd_dma; 148 }; 149 150 struct qedi_conn { 151 struct iscsi_cls_conn *cls_conn; 152 struct qedi_ctx *qedi; 153 struct qedi_endpoint *ep; 154 struct list_head active_cmd_list; 155 spinlock_t list_lock; /* internal conn lock */ 156 u32 active_cmd_count; 157 u32 cmd_cleanup_req; 158 u32 cmd_cleanup_cmpl; 159 160 u32 iscsi_conn_id; 161 int itt; 162 int abrt_conn; 163 #define QEDI_CID_RESERVED 0x5AFF 164 u32 fw_cid; 165 /* 166 * Buffer for login negotiation process 167 */ 168 struct generic_pdu_resc gen_pdu; 169 170 struct list_head tmf_work_list; 171 wait_queue_head_t wait_queue; 172 spinlock_t tmf_work_lock; /* tmf work lock */ 173 unsigned long flags; 174 #define QEDI_CONN_FW_CLEANUP 1 175 }; 176 177 struct qedi_cmd { 178 struct list_head io_cmd; 179 bool io_cmd_in_list; 180 struct iscsi_hdr hdr; 181 struct qedi_conn *conn; 182 struct scsi_cmnd *scsi_cmd; 183 struct scatterlist *sg; 184 struct qedi_io_bdt io_tbl; 185 struct e4_iscsi_task_context request; 186 unsigned char *sense_buffer; 187 dma_addr_t sense_buffer_dma; 188 u16 task_id; 189 190 /* field populated for tmf work queue */ 191 struct iscsi_task *task; 192 struct work_struct tmf_work; 193 int state; 194 #define CLEANUP_WAIT 1 195 #define CLEANUP_RECV 2 196 #define CLEANUP_WAIT_FAILED 3 197 #define CLEANUP_NOT_REQUIRED 4 198 #define LUN_RESET_RESPONSE_RECEIVED 5 199 #define RESPONSE_RECEIVED 6 200 201 int type; 202 #define TYPEIO 1 203 #define TYPERESET 2 204 205 struct qedi_work_map *list_tmf_work; 206 /* slowpath management */ 207 bool use_slowpath; 208 209 struct iscsi_tm_rsp *tmf_resp_buf; 210 struct qedi_work cqe_work; 211 }; 212 213 struct qedi_work_map { 214 struct list_head list; 215 struct qedi_cmd *qedi_cmd; 216 int rtid; 217 218 int state; 219 #define QEDI_WORK_QUEUED 1 220 #define QEDI_WORK_SCHEDULED 2 221 #define QEDI_WORK_EXIT 3 222 223 struct work_struct *ptr_tmf_work; 224 }; 225 226 #define qedi_set_itt(task_id, itt) ((u32)(((task_id) & 0xffff) | ((itt) << 16))) 227 #define qedi_get_itt(cqe) (cqe.iscsi_hdr.cmd.itt >> 16) 228 229 #define QEDI_OFLD_WAIT_STATE(q) ((q)->state == EP_STATE_OFLDCONN_FAILED || \ 230 (q)->state == EP_STATE_OFLDCONN_COMPL) 231 232 #endif /* _QEDI_ISCSI_H_ */ 233