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 
41 enum {
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 
62 struct qedi_conn;
63 
64 struct 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 
103 struct 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  */
133 struct 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 
149 struct 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 
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 	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 
227 struct 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