1 /* Copyright (c) 2007 Coraid, Inc. See COPYING for GPL terms. */
2 #define VERSION "47"
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
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