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Karen Xiec3673462008-12-09 14:15:32 -08001/*
2 * cxgb3i.h: Chelsio S3xx iSCSI driver.
3 *
4 * Copyright (c) 2008 Chelsio Communications, Inc.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation.
9 *
10 * Written by: Karen Xie (kxie@chelsio.com)
11 */
12
13#ifndef __CXGB3I_H__
14#define __CXGB3I_H__
15
16#include <linux/module.h>
17#include <linux/moduleparam.h>
18#include <linux/errno.h>
19#include <linux/types.h>
20#include <linux/list.h>
21#include <linux/netdevice.h>
22#include <linux/scatterlist.h>
Karen Xie949847d2009-02-13 21:38:49 -080023#include <linux/skbuff.h>
Karen Xiec3673462008-12-09 14:15:32 -080024#include <scsi/libiscsi_tcp.h>
25
26/* from cxgb3 LLD */
27#include "common.h"
28#include "t3_cpl.h"
29#include "t3cdev.h"
30#include "cxgb3_ctl_defs.h"
31#include "cxgb3_offload.h"
32#include "firmware_exports.h"
33
34#include "cxgb3i_offload.h"
35#include "cxgb3i_ddp.h"
36
Mike Christiedd0af9f2009-04-21 15:32:33 -050037#define CXGB3I_SCSI_HOST_QDEPTH 1024
Karen Xiec3673462008-12-09 14:15:32 -080038#define CXGB3I_MAX_TARGET CXGB3I_MAX_CONN
39#define CXGB3I_MAX_LUN 512
40#define ISCSI_PDU_NONPAYLOAD_MAX \
41 (sizeof(struct iscsi_hdr) + ISCSI_MAX_AHS_SIZE + 2*ISCSI_DIGEST_SIZE)
42
43struct cxgb3i_adapter;
44struct cxgb3i_hba;
45struct cxgb3i_endpoint;
46
47/**
48 * struct cxgb3i_hba - cxgb3i iscsi structure (per port)
49 *
50 * @snic: cxgb3i adapter containing this port
51 * @ndev: pointer to netdev structure
52 * @shost: pointer to scsi host structure
53 */
54struct cxgb3i_hba {
55 struct cxgb3i_adapter *snic;
56 struct net_device *ndev;
57 struct Scsi_Host *shost;
58};
59
60/**
61 * struct cxgb3i_adapter - cxgb3i adapter structure (per pci)
62 *
63 * @listhead: list head to link elements
64 * @lock: lock for this structure
65 * @tdev: pointer to t3cdev used by cxgb3 driver
66 * @pdev: pointer to pci dev
67 * @hba_cnt: # of hbas (the same as # of ports)
68 * @hba: all the hbas on this adapter
Karen Xie515f1c82009-04-01 13:11:23 -050069 * @flags: bit flag for adapter event/status
Karen Xiec3673462008-12-09 14:15:32 -080070 * @tx_max_size: max. tx packet size supported
71 * @rx_max_size: max. rx packet size supported
72 * @tag_format: ddp tag format settings
73 */
Karen Xie515f1c82009-04-01 13:11:23 -050074#define CXGB3I_ADAPTER_FLAG_RESET 0x1
Karen Xiec3673462008-12-09 14:15:32 -080075struct cxgb3i_adapter {
76 struct list_head list_head;
77 spinlock_t lock;
78 struct t3cdev *tdev;
79 struct pci_dev *pdev;
80 unsigned char hba_cnt;
81 struct cxgb3i_hba *hba[MAX_NPORTS];
82
Karen Xie515f1c82009-04-01 13:11:23 -050083 unsigned int flags;
Karen Xiec3673462008-12-09 14:15:32 -080084 unsigned int tx_max_size;
85 unsigned int rx_max_size;
86
87 struct cxgb3i_tag_format tag_format;
88};
89
90/**
91 * struct cxgb3i_conn - cxgb3i iscsi connection
92 *
93 * @listhead: list head to link elements
94 * @cep: pointer to iscsi_endpoint structure
95 * @conn: pointer to iscsi_conn structure
96 * @hba: pointer to the hba this conn. is going through
97 * @task_idx_bits: # of bits needed for session->cmds_max
98 */
99struct cxgb3i_conn {
100 struct list_head list_head;
101 struct cxgb3i_endpoint *cep;
102 struct iscsi_conn *conn;
103 struct cxgb3i_hba *hba;
104 unsigned int task_idx_bits;
105};
106
107/**
108 * struct cxgb3i_endpoint - iscsi tcp endpoint
109 *
110 * @c3cn: the h/w tcp connection representation
111 * @hba: pointer to the hba this conn. is going through
112 * @cconn: pointer to the associated cxgb3i iscsi connection
113 */
114struct cxgb3i_endpoint {
115 struct s3_conn *c3cn;
116 struct cxgb3i_hba *hba;
117 struct cxgb3i_conn *cconn;
118};
119
Karen Xie949847d2009-02-13 21:38:49 -0800120/**
121 * struct cxgb3i_task_data - private iscsi task data
122 *
123 * @nr_frags: # of coalesced page frags (from scsi sgl)
124 * @frags: coalesced page frags (from scsi sgl)
125 * @skb: tx pdu skb
126 * @offset: data offset for the next pdu
127 * @count: max. possible pdu payload
128 * @sgoffset: offset to the first sg entry for a given offset
129 */
130#define MAX_PDU_FRAGS ((ULP2_MAX_PDU_PAYLOAD + 512 - 1) / 512)
131struct cxgb3i_task_data {
132 unsigned short nr_frags;
133 skb_frag_t frags[MAX_PDU_FRAGS];
134 struct sk_buff *skb;
135 unsigned int offset;
136 unsigned int count;
137 unsigned int sgoffset;
138};
139
Karen Xiec3673462008-12-09 14:15:32 -0800140int cxgb3i_iscsi_init(void);
141void cxgb3i_iscsi_cleanup(void);
142
Karen Xie515f1c82009-04-01 13:11:23 -0500143struct cxgb3i_adapter *cxgb3i_adapter_find_by_tdev(struct t3cdev *);
Mike Christieed6f7742009-04-01 13:11:25 -0500144void cxgb3i_adapter_open(struct t3cdev *);
Karen Xie515f1c82009-04-01 13:11:23 -0500145void cxgb3i_adapter_close(struct t3cdev *);
Karen Xiec3673462008-12-09 14:15:32 -0800146
Karen Xiec3673462008-12-09 14:15:32 -0800147struct cxgb3i_hba *cxgb3i_hba_host_add(struct cxgb3i_adapter *,
148 struct net_device *);
149void cxgb3i_hba_host_remove(struct cxgb3i_hba *);
150
151int cxgb3i_pdu_init(void);
152void cxgb3i_pdu_cleanup(void);
153void cxgb3i_conn_cleanup_task(struct iscsi_task *);
154int cxgb3i_conn_alloc_pdu(struct iscsi_task *, u8);
155int cxgb3i_conn_init_pdu(struct iscsi_task *, unsigned int, unsigned int);
156int cxgb3i_conn_xmit_pdu(struct iscsi_task *);
157
158void cxgb3i_release_itt(struct iscsi_task *task, itt_t hdr_itt);
159int cxgb3i_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt);
160
161#endif