1/* Copyright (c) 2006 Coraid, Inc.  See COPYING for GPL terms. */
2#define VERSION "32"
3#define AOE_MAJOR 152
4#define DEVICE_NAME "aoe"
5
6/* set AOE_PARTITIONS to 1 to use whole-disks only
7 * default is 16, which is 15 partitions plus the whole disk
8 */
9#ifndef AOE_PARTITIONS
10#define AOE_PARTITIONS (16)
11#endif
12
13#define SYSMINOR(aoemajor, aoeminor) ((aoemajor) * NPERSHELF + (aoeminor))
14#define AOEMAJOR(sysminor) ((sysminor) / NPERSHELF)
15#define AOEMINOR(sysminor) ((sysminor) % NPERSHELF)
16#define WHITESPACE " \t\v\f\n"
17
18enum {
19	AOECMD_ATA,
20	AOECMD_CFG,
21
22	AOEFL_RSP = (1<<3),
23	AOEFL_ERR = (1<<2),
24
25	AOEAFL_EXT = (1<<6),
26	AOEAFL_DEV = (1<<4),
27	AOEAFL_ASYNC = (1<<1),
28	AOEAFL_WRITE = (1<<0),
29
30	AOECCMD_READ = 0,
31	AOECCMD_TEST,
32	AOECCMD_PTEST,
33	AOECCMD_SET,
34	AOECCMD_FSET,
35
36	AOE_HVER = 0x10,
37};
38
39struct aoe_hdr {
40	unsigned char dst[6];
41	unsigned char src[6];
42	__be16 type;
43	unsigned char verfl;
44	unsigned char err;
45	__be16 major;
46	unsigned char minor;
47	unsigned char cmd;
48	__be32 tag;
49};
50
51#ifdef __KERNEL__
52#include <linux/skbuff.h>
53
54static inline struct aoe_hdr *aoe_hdr(const struct sk_buff *skb)
55{
56	return (struct aoe_hdr *)skb_mac_header(skb);
57}
58#endif
59
60struct aoe_atahdr {
61	unsigned char aflags;
62	unsigned char errfeat;
63	unsigned char scnt;
64	unsigned char cmdstat;
65	unsigned char lba0;
66	unsigned char lba1;
67	unsigned char lba2;
68	unsigned char lba3;
69	unsigned char lba4;
70	unsigned char lba5;
71	unsigned char res[2];
72};
73
74struct aoe_cfghdr {
75	__be16 bufcnt;
76	__be16 fwver;
77	unsigned char scnt;
78	unsigned char aoeccmd;
79	unsigned char cslen[2];
80};
81
82enum {
83	DEVFL_UP = 1,	/* device is installed in system and ready for AoE->ATA commands */
84	DEVFL_TKILL = (1<<1),	/* flag for timer to know when to kill self */
85	DEVFL_EXT = (1<<2),	/* device accepts lba48 commands */
86	DEVFL_CLOSEWAIT = (1<<3), /* device is waiting for all closes to revalidate */
87	DEVFL_GDALLOC = (1<<4),	/* need to alloc gendisk */
88	DEVFL_PAUSE = (1<<5),
89	DEVFL_NEWSIZE = (1<<6),	/* need to update dev size in block layer */
90	DEVFL_MAXBCNT = (1<<7), /* d->maxbcnt is not changeable */
91	DEVFL_KICKME = (1<<8),
92
93	BUFFL_FAIL = 1,
94};
95
96enum {
97	DEFAULTBCNT = 2 * 512,	/* 2 sectors */
98	NPERSHELF = 16,		/* number of slots per shelf address */
99	FREETAG = -1,
100	MIN_BUFS = 8,
101};
102
103struct buf {
104	struct list_head bufs;
105	ulong start_time;	/* for disk stats */
106	ulong flags;
107	ulong nframesout;
108	char *bufaddr;
109	ulong resid;
110	ulong bv_resid;
111	sector_t sector;
112	struct bio *bio;
113	struct bio_vec *bv;
114};
115
116struct frame {
117	int tag;
118	ulong waited;
119	struct buf *buf;
120	char *bufaddr;
121	ulong bcnt;
122	sector_t lba;
123	struct sk_buff *skb;
124};
125
126struct aoedev {
127	struct aoedev *next;
128	unsigned char addr[6];	/* remote mac addr */
129	ushort flags;
130	ulong sysminor;
131	ulong aoemajor;
132	ulong aoeminor;
133	u16 nopen;		/* (bd_openers isn't available without sleeping) */
134	u16 lasttag;		/* last tag sent */
135	u16 rttavg;		/* round trip average of requests/responses */
136	u16 mintimer;
137	u16 fw_ver;		/* version of blade's firmware */
138	u16 maxbcnt;
139	struct work_struct work;/* disk create work struct */
140	struct gendisk *gd;
141	request_queue_t blkq;
142	struct hd_geometry geo;
143	sector_t ssize;
144	struct timer_list timer;
145	spinlock_t lock;
146	struct net_device *ifp;	/* interface ed is attached to */
147	struct sk_buff *sendq_hd; /* packets needing to be sent, list head */
148	struct sk_buff *sendq_tl;
149	mempool_t *bufpool;	/* for deadlock-free Buf allocation */
150	struct list_head bufq;	/* queue of bios to work on */
151	struct buf *inprocess;	/* the one we're currently working on */
152	ushort lostjumbo;
153	ushort nframes;		/* number of frames below */
154	struct frame *frames;
155};
156
157
158int aoeblk_init(void);
159void aoeblk_exit(void);
160void aoeblk_gdalloc(void *);
161void aoedisk_rm_sysfs(struct aoedev *d);
162
163int aoechr_init(void);
164void aoechr_exit(void);
165void aoechr_error(char *);
166
167void aoecmd_work(struct aoedev *d);
168void aoecmd_cfg(ushort aoemajor, unsigned char aoeminor);
169void aoecmd_ata_rsp(struct sk_buff *);
170void aoecmd_cfg_rsp(struct sk_buff *);
171void aoecmd_sleepwork(struct work_struct *);
172struct sk_buff *new_skb(ulong);
173
174int aoedev_init(void);
175void aoedev_exit(void);
176struct aoedev *aoedev_by_aoeaddr(int maj, int min);
177struct aoedev *aoedev_by_sysminor_m(ulong sysminor, ulong bufcnt);
178void aoedev_downdev(struct aoedev *d);
179int aoedev_isbusy(struct aoedev *d);
180
181int aoenet_init(void);
182void aoenet_exit(void);
183void aoenet_xmit(struct sk_buff *);
184int is_aoe_netif(struct net_device *ifp);
185int set_aoe_iflist(const char __user *str, size_t size);
186
187u64 mac_addr(char addr[6]);
188