1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * QLogic iSCSI Offload Driver
4 * Copyright (c) 2016 Cavium Inc.
5 */
6
7#ifndef _QEDI_ISCSI_H_
8#define _QEDI_ISCSI_H_
9
10#include <linux/socket.h>
11#include <linux/completion.h>
12#include "qedi.h"
13
14#define ISCSI_MAX_SESS_PER_HBA 4096
15
16#define DEF_KA_TIMEOUT 7200000
17#define DEF_KA_INTERVAL 10000
18#define DEF_KA_MAX_PROBE_COUNT 10
19#define DEF_TOS 0
20#define DEF_TTL 0xfe
21#define DEF_SND_SEQ_SCALE 0
22#define DEF_RCV_BUF 0xffff
23#define DEF_SND_BUF 0xffff
24#define DEF_SEED 0
25#define DEF_MAX_RT_TIME 8000
26#define DEF_MAX_DA_COUNT 2
27#define DEF_SWS_TIMER 1000
28#define DEF_MAX_CWND 2
29#define DEF_PATH_MTU 1500
30#define DEF_MSS 1460
31#define DEF_LL2_MTU 1560
32#define JUMBO_MTU 9000
33
34#define MIN_MTU 576 /* rfc 793 */
35#define IPV4_HDR_LEN 20
36#define IPV6_HDR_LEN 40
37#define TCP_HDR_LEN 20
38#define TCP_OPTION_LEN 12
39#define VLAN_LEN 4
40
41enum {
42 EP_STATE_IDLE = 0x0,
43 EP_STATE_ACQRCONN_START = 0x1,
44 EP_STATE_ACQRCONN_COMPL = 0x2,
45 EP_STATE_OFLDCONN_START = 0x4,
46 EP_STATE_OFLDCONN_COMPL = 0x8,
47 EP_STATE_DISCONN_START = 0x10,
48 EP_STATE_DISCONN_COMPL = 0x20,
49 EP_STATE_CLEANUP_START = 0x40,
50 EP_STATE_CLEANUP_CMPL = 0x80,
51 EP_STATE_TCP_FIN_RCVD = 0x100,
52 EP_STATE_TCP_RST_RCVD = 0x200,
53 EP_STATE_LOGOUT_SENT = 0x400,
54 EP_STATE_LOGOUT_RESP_RCVD = 0x800,
55 EP_STATE_CLEANUP_FAILED = 0x1000,
56 EP_STATE_OFLDCONN_FAILED = 0x2000,
57 EP_STATE_CONNECT_FAILED = 0x4000,
58 EP_STATE_DISCONN_TIMEDOUT = 0x8000,
59 EP_STATE_OFLDCONN_NONE = 0x10000,
60};
61
62struct qedi_conn;
63
64struct qedi_endpoint {
65 struct qedi_ctx *qedi;
66 u32 dst_addr[4];
67 u32 src_addr[4];
68 u16 src_port;
69 u16 dst_port;
70 u16 vlan_id;
71 u16 pmtu;
72 u8 src_mac[ETH_ALEN];
73 u8 dst_mac[ETH_ALEN];
74 u8 ip_type;
75 int state;
76 wait_queue_head_t ofld_wait;
77 wait_queue_head_t tcp_ofld_wait;
78 u32 iscsi_cid;
79 /* identifier of the connection from qed */
80 u32 handle;
81 u32 fw_cid;
82 void __iomem *p_doorbell;
83 struct iscsi_db_data db_data;
84
85 /* Send queue management */
86 struct iscsi_wqe *sq;
87 dma_addr_t sq_dma;
88
89 u16 sq_prod_idx;
90 u16 fw_sq_prod_idx;
91 u16 sq_con_idx;
92 u32 sq_mem_size;
93
94 void *sq_pbl;
95 dma_addr_t sq_pbl_dma;
96 u32 sq_pbl_size;
97 struct qedi_conn *conn;
98 struct work_struct offload_work;
99};
100
101#define QEDI_SQ_WQES_MIN 16
102
103struct qedi_io_bdt {
104 struct scsi_sge *sge_tbl;
105 dma_addr_t sge_tbl_dma;
106 u16 sge_valid;
107};
108
109/**
110 * struct generic_pdu_resc - login pdu resource structure
111 *
112 * @req_buf: driver buffer used to stage payload associated with
113 * the login request
114 * @req_dma_addr: dma address for iscsi login request payload buffer
115 * @req_buf_size: actual login request payload length
116 * @req_wr_ptr: pointer into login request buffer when next data is
117 * to be written
118 * @resp_hdr: iscsi header where iscsi login response header is to
119 * be recreated
120 * @resp_buf: buffer to stage login response payload
121 * @resp_dma_addr: login response payload buffer dma address
122 * @resp_buf_size: login response paylod length
123 * @resp_wr_ptr: pointer into login response buffer when next data is
124 * to be written
125 * @req_bd_tbl: iscsi login request payload BD table
126 * @req_bd_dma: login request BD table dma address
127 * @resp_bd_tbl: iscsi login response payload BD table
128 * @resp_bd_dma: login request BD table dma address
129 *
130 * following structure defines buffer info for generic pdus such as iSCSI Login,
131 * Logout and NOP
132 */
133struct generic_pdu_resc {
134 char *req_buf;
135 dma_addr_t req_dma_addr;
136 u32 req_buf_size;
137 char *req_wr_ptr;
138 struct iscsi_hdr resp_hdr;
139 char *resp_buf;
140 dma_addr_t resp_dma_addr;
141 u32 resp_buf_size;
142 char *resp_wr_ptr;
143 char *req_bd_tbl;
144 dma_addr_t req_bd_dma;
145 char *resp_bd_tbl;
146 dma_addr_t resp_bd_dma;
147};
148
149struct qedi_conn {
150 struct iscsi_cls_conn *cls_conn;
151 struct qedi_ctx *qedi;
152 struct qedi_endpoint *ep;
153 struct iscsi_endpoint *iscsi_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 atomic_t 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 bool ep_disconnect_starting;
174 int fw_cleanup_works;
175};
176
177struct 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
213struct qedi_work_map {
214 struct list_head list;
215 struct qedi_cmd *qedi_cmd;
216 struct iscsi_task *ctask;
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
227struct 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

source code of linux/drivers/scsi/qedi/qedi_iscsi.h