drivers/scsi/qedi/qedi_iscsi.h

   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 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_ */