1 /* Copyright (c) 2007 Coraid, Inc.  See COPYING for GPL terms. */
2 #define VERSION "47q"
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 
18 enum {
19 	AOECMD_ATA,
20 	AOECMD_CFG,
21 	AOECMD_VEND_MIN = 0xf0,
22 
23 	AOEFL_RSP = (1<<3),
24 	AOEFL_ERR = (1<<2),
25 
26 	AOEAFL_EXT = (1<<6),
27 	AOEAFL_DEV = (1<<4),
28 	AOEAFL_ASYNC = (1<<1),
29 	AOEAFL_WRITE = (1<<0),
30 
31 	AOECCMD_READ = 0,
32 	AOECCMD_TEST,
33 	AOECCMD_PTEST,
34 	AOECCMD_SET,
35 	AOECCMD_FSET,
36 
37 	AOE_HVER = 0x10,
38 };
39 
40 struct aoe_hdr {
41 	unsigned char dst[6];
42 	unsigned char src[6];
43 	__be16 type;
44 	unsigned char verfl;
45 	unsigned char err;
46 	__be16 major;
47 	unsigned char minor;
48 	unsigned char cmd;
49 	__be32 tag;
50 };
51 
52 struct aoe_atahdr {
53 	unsigned char aflags;
54 	unsigned char errfeat;
55 	unsigned char scnt;
56 	unsigned char cmdstat;
57 	unsigned char lba0;
58 	unsigned char lba1;
59 	unsigned char lba2;
60 	unsigned char lba3;
61 	unsigned char lba4;
62 	unsigned char lba5;
63 	unsigned char res[2];
64 };
65 
66 struct aoe_cfghdr {
67 	__be16 bufcnt;
68 	__be16 fwver;
69 	unsigned char scnt;
70 	unsigned char aoeccmd;
71 	unsigned char cslen[2];
72 };
73 
74 enum {
75 	DEVFL_UP = 1,	/* device is installed in system and ready for AoE->ATA commands */
76 	DEVFL_TKILL = (1<<1),	/* flag for timer to know when to kill self */
77 	DEVFL_EXT = (1<<2),	/* device accepts lba48 commands */
78 	DEVFL_CLOSEWAIT = (1<<3), /* device is waiting for all closes to revalidate */
79 	DEVFL_GDALLOC = (1<<4),	/* need to alloc gendisk */
80 	DEVFL_KICKME = (1<<5),	/* slow polling network card catch */
81 	DEVFL_NEWSIZE = (1<<6),	/* need to update dev size in block layer */
82 
83 	BUFFL_FAIL = 1,
84 };
85 
86 enum {
87 	DEFAULTBCNT = 2 * 512,	/* 2 sectors */
88 	NPERSHELF = 16,		/* number of slots per shelf address */
89 	FREETAG = -1,
90 	MIN_BUFS = 16,
91 	NTARGETS = 8,
92 	NAOEIFS = 8,
93 	NSKBPOOLMAX = 128,
94 
95 	TIMERTICK = HZ / 10,
96 	MINTIMER = HZ >> 2,
97 	MAXTIMER = HZ << 1,
98 	HELPWAIT = 20,
99 };
100 
101 struct buf {
102 	struct list_head bufs;
103 	ulong stime;	/* for disk stats */
104 	ulong flags;
105 	ulong nframesout;
106 	ulong resid;
107 	ulong bv_resid;
108 	ulong bv_off;
109 	sector_t sector;
110 	struct bio *bio;
111 	struct bio_vec *bv;
112 };
113 
114 struct frame {
115 	int tag;
116 	ulong waited;
117 	struct buf *buf;
118 	char *bufaddr;
119 	ulong bcnt;
120 	sector_t lba;
121 	struct sk_buff *skb;
122 };
123 
124 struct aoeif {
125 	struct net_device *nd;
126 	unsigned char lost;
127 	unsigned char lostjumbo;
128 	ushort maxbcnt;
129 };
130 
131 struct aoetgt {
132 	unsigned char addr[6];
133 	ushort nframes;
134 	struct frame *frames;
135 	struct aoeif ifs[NAOEIFS];
136 	struct aoeif *ifp;	/* current aoeif in use */
137 	ushort nout;
138 	ushort maxout;
139 	u16 lasttag;		/* last tag sent */
140 	u16 useme;
141 	ulong lastwadj;		/* last window adjustment */
142 	int wpkts, rpkts;
143 	int dataref;
144 };
145 
146 struct aoedev {
147 	struct aoedev *next;
148 	ulong sysminor;
149 	ulong aoemajor;
150 	u16 aoeminor;
151 	u16 flags;
152 	u16 nopen;		/* (bd_openers isn't available without sleeping) */
153 	u16 rttavg;		/* round trip average of requests/responses */
154 	u16 mintimer;
155 	u16 fw_ver;		/* version of blade's firmware */
156 	struct work_struct work;/* disk create work struct */
157 	struct gendisk *gd;
158 	struct request_queue *blkq;
159 	struct hd_geometry geo;
160 	sector_t ssize;
161 	struct timer_list timer;
162 	spinlock_t lock;
163 	struct sk_buff_head sendq;
164 	struct sk_buff_head skbpool;
165 	mempool_t *bufpool;	/* for deadlock-free Buf allocation */
166 	struct list_head bufq;	/* queue of bios to work on */
167 	struct buf *inprocess;	/* the one we're currently working on */
168 	struct aoetgt *targets[NTARGETS];
169 	struct aoetgt **tgt;	/* target in use when working */
170 	struct aoetgt **htgt;	/* target needing rexmit assistance */
171 };
172 
173 
174 int aoeblk_init(void);
175 void aoeblk_exit(void);
176 void aoeblk_gdalloc(void *);
177 void aoedisk_rm_sysfs(struct aoedev *d);
178 
179 int aoechr_init(void);
180 void aoechr_exit(void);
181 void aoechr_error(char *);
182 
183 void aoecmd_work(struct aoedev *d);
184 void aoecmd_cfg(ushort aoemajor, unsigned char aoeminor);
185 void aoecmd_ata_rsp(struct sk_buff *);
186 void aoecmd_cfg_rsp(struct sk_buff *);
187 void aoecmd_sleepwork(struct work_struct *);
188 void aoecmd_cleanslate(struct aoedev *);
189 struct sk_buff *aoecmd_ata_id(struct aoedev *);
190 
191 int aoedev_init(void);
192 void aoedev_exit(void);
193 struct aoedev *aoedev_by_aoeaddr(int maj, int min);
194 struct aoedev *aoedev_by_sysminor_m(ulong sysminor);
195 void aoedev_downdev(struct aoedev *d);
196 int aoedev_flush(const char __user *str, size_t size);
197 
198 int aoenet_init(void);
199 void aoenet_exit(void);
200 void aoenet_xmit(struct sk_buff_head *);
201 int is_aoe_netif(struct net_device *ifp);
202 int set_aoe_iflist(const char __user *str, size_t size);
203 
204