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/*
* QLogic iSCSI Offload Driver
* Copyright (c) 2016 Cavium Inc.
*
* This software is available under the terms of the GNU General Public License
* (GPL) Version 2, available from the file COPYING in the main directory of
* this source tree.
*/
#ifndef _QEDI_ISCSI_H_
#define _QEDI_ISCSI_H_
#include <linux/socket.h>
#include <linux/completion.h>
#include "qedi.h"
#define ISCSI_MAX_SESS_PER_HBA 4096
#define DEF_KA_TIMEOUT 7200000
#define DEF_KA_INTERVAL 10000
#define DEF_KA_MAX_PROBE_COUNT 10
#define DEF_TOS 0
#define DEF_TTL 0xfe
#define DEF_SND_SEQ_SCALE 0
#define DEF_RCV_BUF 0xffff
#define DEF_SND_BUF 0xffff
#define DEF_SEED 0
#define DEF_MAX_RT_TIME 8000
#define DEF_MAX_DA_COUNT 2
#define DEF_SWS_TIMER 1000
#define DEF_MAX_CWND 2
#define DEF_PATH_MTU 1500
#define DEF_MSS 1460
#define DEF_LL2_MTU 1560
#define JUMBO_MTU 9000
#define MIN_MTU 576 /* rfc 793 */
#define IPV4_HDR_LEN 20
#define IPV6_HDR_LEN 40
#define TCP_HDR_LEN 20
#define TCP_OPTION_LEN 12
#define VLAN_LEN 4
enum {
EP_STATE_IDLE = 0x0,
EP_STATE_ACQRCONN_START = 0x1,
EP_STATE_ACQRCONN_COMPL = 0x2,
EP_STATE_OFLDCONN_START = 0x4,
EP_STATE_OFLDCONN_COMPL = 0x8,
EP_STATE_DISCONN_START = 0x10,
EP_STATE_DISCONN_COMPL = 0x20,
EP_STATE_CLEANUP_START = 0x40,
EP_STATE_CLEANUP_CMPL = 0x80,
EP_STATE_TCP_FIN_RCVD = 0x100,
EP_STATE_TCP_RST_RCVD = 0x200,
EP_STATE_LOGOUT_SENT = 0x400,
EP_STATE_LOGOUT_RESP_RCVD = 0x800,
EP_STATE_CLEANUP_FAILED = 0x1000,
EP_STATE_OFLDCONN_FAILED = 0x2000,
EP_STATE_CONNECT_FAILED = 0x4000,
EP_STATE_DISCONN_TIMEDOUT = 0x8000,
};
struct qedi_conn;
struct qedi_endpoint {
struct qedi_ctx *qedi;
u32 dst_addr[4];
u32 src_addr[4];
u16 src_port;
u16 dst_port;
u16 vlan_id;
u16 pmtu;
u8 src_mac[ETH_ALEN];
u8 dst_mac[ETH_ALEN];
u8 ip_type;
int state;
wait_queue_head_t ofld_wait;
wait_queue_head_t tcp_ofld_wait;
u32 iscsi_cid;
/* identifier of the connection from qed */
u32 handle;
u32 fw_cid;
void __iomem *p_doorbell;
/* Send queue management */
struct iscsi_wqe *sq;
dma_addr_t sq_dma;
u16 sq_prod_idx;
u16 fw_sq_prod_idx;
u16 sq_con_idx;
u32 sq_mem_size;
void *sq_pbl;
dma_addr_t sq_pbl_dma;
u32 sq_pbl_size;
struct qedi_conn *conn;
struct work_struct offload_work;
};
#define QEDI_SQ_WQES_MIN 16
struct qedi_io_bdt {
struct scsi_sge *sge_tbl;
dma_addr_t sge_tbl_dma;
u16 sge_valid;
};
/**
* struct generic_pdu_resc - login pdu resource structure
*
* @req_buf: driver buffer used to stage payload associated with
* the login request
* @req_dma_addr: dma address for iscsi login request payload buffer
* @req_buf_size: actual login request payload length
* @req_wr_ptr: pointer into login request buffer when next data is
* to be written
* @resp_hdr: iscsi header where iscsi login response header is to
* be recreated
* @resp_buf: buffer to stage login response payload
* @resp_dma_addr: login response payload buffer dma address
* @resp_buf_size: login response paylod length
* @resp_wr_ptr: pointer into login response buffer when next data is
* to be written
* @req_bd_tbl: iscsi login request payload BD table
* @req_bd_dma: login request BD table dma address
* @resp_bd_tbl: iscsi login response payload BD table
* @resp_bd_dma: login request BD table dma address
*
* following structure defines buffer info for generic pdus such as iSCSI Login,
* Logout and NOP
*/
struct generic_pdu_resc {
char *req_buf;
dma_addr_t req_dma_addr;
u32 req_buf_size;
char *req_wr_ptr;
struct iscsi_hdr resp_hdr;
char *resp_buf;
dma_addr_t resp_dma_addr;
u32 resp_buf_size;
char *resp_wr_ptr;
char *req_bd_tbl;
dma_addr_t req_bd_dma;
char *resp_bd_tbl;
dma_addr_t resp_bd_dma;
};
struct qedi_conn {
struct iscsi_cls_conn *cls_conn;
struct qedi_ctx *qedi;
struct qedi_endpoint *ep;
struct list_head active_cmd_list;
spinlock_t list_lock; /* internal conn lock */
u32 active_cmd_count;
u32 cmd_cleanup_req;
u32 cmd_cleanup_cmpl;
u32 iscsi_conn_id;
int itt;
int abrt_conn;
#define QEDI_CID_RESERVED 0x5AFF
u32 fw_cid;
/*
* Buffer for login negotiation process
*/
struct generic_pdu_resc gen_pdu;
struct list_head tmf_work_list;
wait_queue_head_t wait_queue;
spinlock_t tmf_work_lock; /* tmf work lock */
unsigned long flags;
#define QEDI_CONN_FW_CLEANUP 1
};
struct qedi_cmd {
struct list_head io_cmd;
bool io_cmd_in_list;
struct iscsi_hdr hdr;
struct qedi_conn *conn;
struct scsi_cmnd *scsi_cmd;
struct scatterlist *sg;
struct qedi_io_bdt io_tbl;
struct e4_iscsi_task_context request;
unsigned char *sense_buffer;
dma_addr_t sense_buffer_dma;
u16 task_id;
/* field populated for tmf work queue */
struct iscsi_task *task;
struct work_struct tmf_work;
int state;
#define CLEANUP_WAIT 1
#define CLEANUP_RECV 2
#define CLEANUP_WAIT_FAILED 3
#define CLEANUP_NOT_REQUIRED 4
#define LUN_RESET_RESPONSE_RECEIVED 5
#define RESPONSE_RECEIVED 6
int type;
#define TYPEIO 1
#define TYPERESET 2
struct qedi_work_map *list_tmf_work;
/* slowpath management */
bool use_slowpath;
struct iscsi_tm_rsp *tmf_resp_buf;
struct qedi_work cqe_work;
};
struct qedi_work_map {
struct list_head list;
struct qedi_cmd *qedi_cmd;
int rtid;
int state;
#define QEDI_WORK_QUEUED 1
#define QEDI_WORK_SCHEDULED 2
#define QEDI_WORK_EXIT 3
struct work_struct *ptr_tmf_work;
};
#define qedi_set_itt(task_id, itt) ((u32)(((task_id) & 0xffff) | ((itt) << 16)))
#define qedi_get_itt(cqe) (cqe.iscsi_hdr.cmd.itt >> 16)
#define QEDI_OFLD_WAIT_STATE(q) ((q)->state == EP_STATE_OFLDCONN_FAILED || \
(q)->state == EP_STATE_OFLDCONN_COMPL)
#endif /* _QEDI_ISCSI_H_ */
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