scsi/qedi/qedi_iscsi.h

0001 /* SPDX-License-Identifier: GPL-2.0-only */
0002 /*
0003  * QLogic iSCSI Offload Driver
0004  * Copyright (c) 2016 Cavium Inc.
0005  */
0006
0007 #ifndef _QEDI_ISCSI_H_
0008 #define _QEDI_ISCSI_H_
0009
0010 #include <linux/socket.h>
0011 #include <linux/completion.h>
0012 #include "qedi.h"
0013
0014 #define ISCSI_MAX_SESS_PER_HBA  4096
0015
0016 #define DEF_KA_TIMEOUT      7200000
0017 #define DEF_KA_INTERVAL     10000
0018 #define DEF_KA_MAX_PROBE_COUNT  10
0019 #define DEF_TOS         0
0020 #define DEF_TTL         0xfe
0021 #define DEF_SND_SEQ_SCALE   0
0022 #define DEF_RCV_BUF     0xffff
0023 #define DEF_SND_BUF     0xffff
0024 #define DEF_SEED        0
0025 #define DEF_MAX_RT_TIME     8000
0026 #define DEF_MAX_DA_COUNT        2
0027 #define DEF_SWS_TIMER       1000
0028 #define DEF_MAX_CWND        2
0029 #define DEF_PATH_MTU        1500
0030 #define DEF_MSS         1460
0031 #define DEF_LL2_MTU     1560
0032 #define JUMBO_MTU       9000
0033
0034 #define MIN_MTU         576 /* rfc 793 */
0035 #define IPV4_HDR_LEN    20
0036 #define IPV6_HDR_LEN    40
0037 #define TCP_HDR_LEN     20
0038 #define TCP_OPTION_LEN  12
0039 #define VLAN_LEN         4
0040
0041 enum {
0042     EP_STATE_IDLE                   = 0x0,
0043     EP_STATE_ACQRCONN_START         = 0x1,
0044     EP_STATE_ACQRCONN_COMPL         = 0x2,
0045     EP_STATE_OFLDCONN_START         = 0x4,
0046     EP_STATE_OFLDCONN_COMPL         = 0x8,
0047     EP_STATE_DISCONN_START          = 0x10,
0048     EP_STATE_DISCONN_COMPL          = 0x20,
0049     EP_STATE_CLEANUP_START          = 0x40,
0050     EP_STATE_CLEANUP_CMPL           = 0x80,
0051     EP_STATE_TCP_FIN_RCVD           = 0x100,
0052     EP_STATE_TCP_RST_RCVD           = 0x200,
0053     EP_STATE_LOGOUT_SENT            = 0x400,
0054     EP_STATE_LOGOUT_RESP_RCVD       = 0x800,
0055     EP_STATE_CLEANUP_FAILED         = 0x1000,
0056     EP_STATE_OFLDCONN_FAILED        = 0x2000,
0057     EP_STATE_CONNECT_FAILED         = 0x4000,
0058     EP_STATE_DISCONN_TIMEDOUT       = 0x8000,
0059     EP_STATE_OFLDCONN_NONE          = 0x10000,
0060 };
0061
0062 struct qedi_conn;
0063
0064 struct qedi_endpoint {
0065     struct qedi_ctx *qedi;
0066     u32 dst_addr[4];
0067     u32 src_addr[4];
0068     u16 src_port;
0069     u16 dst_port;
0070     u16 vlan_id;
0071     u16 pmtu;
0072     u8 src_mac[ETH_ALEN];
0073     u8 dst_mac[ETH_ALEN];
0074     u8 ip_type;
0075     int state;
0076     wait_queue_head_t ofld_wait;
0077     wait_queue_head_t tcp_ofld_wait;
0078     u32 iscsi_cid;
0079     /* identifier of the connection from qed */
0080     u32 handle;
0081     u32 fw_cid;
0082     void __iomem *p_doorbell;
0083     struct iscsi_db_data db_data;
0084
0085     /* Send queue management */
0086     struct iscsi_wqe *sq;
0087     dma_addr_t sq_dma;
0088
0089     u16 sq_prod_idx;
0090     u16 fw_sq_prod_idx;
0091     u16 sq_con_idx;
0092     u32 sq_mem_size;
0093
0094     void *sq_pbl;
0095     dma_addr_t sq_pbl_dma;
0096     u32 sq_pbl_size;
0097     struct qedi_conn *conn;
0098     struct work_struct offload_work;
0099 };
0100
0101 #define QEDI_SQ_WQES_MIN    16
0102
0103 struct qedi_io_bdt {
0104     struct scsi_sge *sge_tbl;
0105     dma_addr_t sge_tbl_dma;
0106     u16 sge_valid;
0107 };
0108
0109 /**
0110  * struct generic_pdu_resc - login pdu resource structure
0111  *
0112  * @req_buf:            driver buffer used to stage payload associated with
0113  *                      the login request
0114  * @req_dma_addr:       dma address for iscsi login request payload buffer
0115  * @req_buf_size:       actual login request payload length
0116  * @req_wr_ptr:         pointer into login request buffer when next data is
0117  *                      to be written
0118  * @resp_hdr:           iscsi header where iscsi login response header is to
0119  *                      be recreated
0120  * @resp_buf:           buffer to stage login response payload
0121  * @resp_dma_addr:      login response payload buffer dma address
0122  * @resp_buf_size:      login response paylod length
0123  * @resp_wr_ptr:        pointer into login response buffer when next data is
0124  *                      to be written
0125  * @req_bd_tbl:         iscsi login request payload BD table
0126  * @req_bd_dma:         login request BD table dma address
0127  * @resp_bd_tbl:        iscsi login response payload BD table
0128  * @resp_bd_dma:        login request BD table dma address
0129  *
0130  * following structure defines buffer info for generic pdus such as iSCSI Login,
0131  *      Logout and NOP
0132  */
0133 struct generic_pdu_resc {
0134     char *req_buf;
0135     dma_addr_t req_dma_addr;
0136     u32 req_buf_size;
0137     char *req_wr_ptr;
0138     struct iscsi_hdr resp_hdr;
0139     char *resp_buf;
0140     dma_addr_t resp_dma_addr;
0141     u32 resp_buf_size;
0142     char *resp_wr_ptr;
0143     char *req_bd_tbl;
0144     dma_addr_t req_bd_dma;
0145     char *resp_bd_tbl;
0146     dma_addr_t resp_bd_dma;
0147 };
0148
0149 struct qedi_conn {
0150     struct iscsi_cls_conn *cls_conn;
0151     struct qedi_ctx *qedi;
0152     struct qedi_endpoint *ep;
0153     struct iscsi_endpoint *iscsi_ep;
0154     struct list_head active_cmd_list;
0155     spinlock_t list_lock;       /* internal conn lock */
0156     u32 active_cmd_count;
0157     u32 cmd_cleanup_req;
0158     atomic_t cmd_cleanup_cmpl;
0159
0160     u32 iscsi_conn_id;
0161     int itt;
0162     int abrt_conn;
0163 #define QEDI_CID_RESERVED   0x5AFF
0164     u32 fw_cid;
0165     /*
0166      * Buffer for login negotiation process
0167      */
0168     struct generic_pdu_resc gen_pdu;
0169
0170     struct list_head tmf_work_list;
0171     wait_queue_head_t wait_queue;
0172     spinlock_t tmf_work_lock;   /* tmf work lock */
0173     bool ep_disconnect_starting;
0174     int fw_cleanup_works;
0175 };
0176
0177 struct qedi_cmd {
0178     struct list_head io_cmd;
0179     bool io_cmd_in_list;
0180     struct iscsi_hdr hdr;
0181     struct qedi_conn *conn;
0182     struct scsi_cmnd *scsi_cmd;
0183     struct scatterlist *sg;
0184     struct qedi_io_bdt io_tbl;
0185     struct iscsi_task_context request;
0186     unsigned char *sense_buffer;
0187     dma_addr_t sense_buffer_dma;
0188     u16 task_id;
0189
0190     /* field populated for tmf work queue */
0191     struct iscsi_task *task;
0192     struct work_struct tmf_work;
0193     int state;
0194 #define CLEANUP_WAIT    1
0195 #define CLEANUP_RECV    2
0196 #define CLEANUP_WAIT_FAILED 3
0197 #define CLEANUP_NOT_REQUIRED    4
0198 #define LUN_RESET_RESPONSE_RECEIVED 5
0199 #define RESPONSE_RECEIVED   6
0200
0201     int type;
0202 #define TYPEIO      1
0203 #define TYPERESET   2
0204
0205     struct qedi_work_map *list_tmf_work;
0206     /* slowpath management */
0207     bool use_slowpath;
0208
0209     struct iscsi_tm_rsp *tmf_resp_buf;
0210     struct qedi_work cqe_work;
0211 };
0212
0213 struct qedi_work_map {
0214     struct list_head list;
0215     struct qedi_cmd *qedi_cmd;
0216     struct iscsi_task *ctask;
0217     int rtid;
0218
0219     int state;
0220 #define QEDI_WORK_QUEUED    1
0221 #define QEDI_WORK_SCHEDULED 2
0222 #define QEDI_WORK_EXIT      3
0223
0224     struct work_struct *ptr_tmf_work;
0225 };
0226
0227 struct qedi_boot_target {
0228     char ip_addr[64];
0229     char iscsi_name[255];
0230     u32 ipv6_en;
0231 };
0232
0233 #define qedi_set_itt(task_id, itt) ((u32)(((task_id) & 0xffff) | ((itt) << 16)))
0234 #define qedi_get_itt(cqe) (cqe.iscsi_hdr.cmd.itt >> 16)
0235
0236 #define QEDI_OFLD_WAIT_STATE(q) ((q)->state == EP_STATE_OFLDCONN_FAILED || \
0237                 (q)->state == EP_STATE_OFLDCONN_COMPL)
0238
0239 #endif /* _QEDI_ISCSI_H_ */