Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
[cris-mirror.git] / drivers / block / aoe / aoe.h
blobc0ebda1283ccaae201b9ca03aaec18df11e76efd
1 /* Copyright (c) 2013 Coraid, Inc. See COPYING for GPL terms. */
2 #define VERSION "85"
3 #define AOE_MAJOR 152
4 #define DEVICE_NAME "aoe"
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
13 #define WHITESPACE " \t\v\f\n,"
15 enum {
16 AOECMD_ATA,
17 AOECMD_CFG,
18 AOECMD_VEND_MIN = 0xf0,
20 AOEFL_RSP = (1<<3),
21 AOEFL_ERR = (1<<2),
23 AOEAFL_EXT = (1<<6),
24 AOEAFL_DEV = (1<<4),
25 AOEAFL_ASYNC = (1<<1),
26 AOEAFL_WRITE = (1<<0),
28 AOECCMD_READ = 0,
29 AOECCMD_TEST,
30 AOECCMD_PTEST,
31 AOECCMD_SET,
32 AOECCMD_FSET,
34 AOE_HVER = 0x10,
37 struct aoe_hdr {
38 unsigned char dst[6];
39 unsigned char src[6];
40 __be16 type;
41 unsigned char verfl;
42 unsigned char err;
43 __be16 major;
44 unsigned char minor;
45 unsigned char cmd;
46 __be32 tag;
49 struct aoe_atahdr {
50 unsigned char aflags;
51 unsigned char errfeat;
52 unsigned char scnt;
53 unsigned char cmdstat;
54 unsigned char lba0;
55 unsigned char lba1;
56 unsigned char lba2;
57 unsigned char lba3;
58 unsigned char lba4;
59 unsigned char lba5;
60 unsigned char res[2];
63 struct aoe_cfghdr {
64 __be16 bufcnt;
65 __be16 fwver;
66 unsigned char scnt;
67 unsigned char aoeccmd;
68 unsigned char cslen[2];
71 enum {
72 DEVFL_UP = 1, /* device is installed in system and ready for AoE->ATA commands */
73 DEVFL_TKILL = (1<<1), /* flag for timer to know when to kill self */
74 DEVFL_EXT = (1<<2), /* device accepts lba48 commands */
75 DEVFL_GDALLOC = (1<<3), /* need to alloc gendisk */
76 DEVFL_GD_NOW = (1<<4), /* allocating gendisk */
77 DEVFL_KICKME = (1<<5), /* slow polling network card catch */
78 DEVFL_NEWSIZE = (1<<6), /* need to update dev size in block layer */
79 DEVFL_FREEING = (1<<7), /* set when device is being cleaned up */
80 DEVFL_FREED = (1<<8), /* device has been cleaned up */
83 enum {
84 DEFAULTBCNT = 2 * 512, /* 2 sectors */
85 MIN_BUFS = 16,
86 NTARGETS = 4,
87 NAOEIFS = 8,
88 NSKBPOOLMAX = 256,
89 NFACTIVE = 61,
91 TIMERTICK = HZ / 10,
92 RTTSCALE = 8,
93 RTTDSCALE = 3,
94 RTTAVG_INIT = USEC_PER_SEC / 4 << RTTSCALE,
95 RTTDEV_INIT = RTTAVG_INIT / 4,
97 HARD_SCORN_SECS = 10, /* try another remote port after this */
98 MAX_TAINT = 1000, /* cap on aoetgt taint */
101 struct buf {
102 ulong nframesout;
103 struct bio *bio;
104 struct bvec_iter iter;
105 struct request *rq;
108 enum frame_flags {
109 FFL_PROBE = 1,
112 struct frame {
113 struct list_head head;
114 u32 tag;
115 ktime_t sent; /* high-res time packet was sent */
116 ulong waited;
117 ulong waited_total;
118 struct aoetgt *t; /* parent target I belong to */
119 struct sk_buff *skb; /* command skb freed on module exit */
120 struct sk_buff *r_skb; /* response skb for async processing */
121 struct buf *buf;
122 struct bvec_iter iter;
123 char flags;
126 struct aoeif {
127 struct net_device *nd;
128 ulong lost;
129 int bcnt;
132 struct aoetgt {
133 unsigned char addr[6];
134 ushort nframes; /* cap on frames to use */
135 struct aoedev *d; /* parent device I belong to */
136 struct list_head ffree; /* list of free frames */
137 struct aoeif ifs[NAOEIFS];
138 struct aoeif *ifp; /* current aoeif in use */
139 ushort nout; /* number of AoE commands outstanding */
140 ushort maxout; /* current value for max outstanding */
141 ushort next_cwnd; /* incr maxout after decrementing to zero */
142 ushort ssthresh; /* slow start threshold */
143 ulong falloc; /* number of allocated frames */
144 int taint; /* how much we want to avoid this aoetgt */
145 int minbcnt;
146 int wpkts, rpkts;
147 char nout_probes;
150 struct aoedev {
151 struct aoedev *next;
152 ulong sysminor;
153 ulong aoemajor;
154 u32 rttavg; /* scaled AoE round trip time average */
155 u32 rttdev; /* scaled round trip time mean deviation */
156 u16 aoeminor;
157 u16 flags;
158 u16 nopen; /* (bd_openers isn't available without sleeping) */
159 u16 fw_ver; /* version of blade's firmware */
160 u16 lasttag; /* last tag sent */
161 u16 useme;
162 ulong ref;
163 struct work_struct work;/* disk create work struct */
164 struct gendisk *gd;
165 struct dentry *debugfs;
166 struct request_queue *blkq;
167 struct hd_geometry geo;
168 sector_t ssize;
169 struct timer_list timer;
170 spinlock_t lock;
171 struct sk_buff_head skbpool;
172 mempool_t *bufpool; /* for deadlock-free Buf allocation */
173 struct { /* pointers to work in progress */
174 struct buf *buf;
175 struct bio *nxbio;
176 struct request *rq;
177 } ip;
178 ulong maxbcnt;
179 struct list_head factive[NFACTIVE]; /* hash of active frames */
180 struct list_head rexmitq; /* deferred retransmissions */
181 struct aoetgt **targets;
182 ulong ntargets; /* number of allocated aoetgt pointers */
183 struct aoetgt **tgt; /* target in use when working */
184 ulong kicked;
185 char ident[512];
188 /* kthread tracking */
189 struct ktstate {
190 struct completion rendez;
191 struct task_struct *task;
192 wait_queue_head_t *waitq;
193 int (*fn) (int);
194 char name[12];
195 spinlock_t *lock;
196 int id;
197 int active;
200 int aoeblk_init(void);
201 void aoeblk_exit(void);
202 void aoeblk_gdalloc(void *);
203 void aoedisk_rm_debugfs(struct aoedev *d);
204 void aoedisk_rm_sysfs(struct aoedev *d);
206 int aoechr_init(void);
207 void aoechr_exit(void);
208 void aoechr_error(char *);
210 void aoecmd_work(struct aoedev *d);
211 void aoecmd_cfg(ushort aoemajor, unsigned char aoeminor);
212 struct sk_buff *aoecmd_ata_rsp(struct sk_buff *);
213 void aoecmd_cfg_rsp(struct sk_buff *);
214 void aoecmd_sleepwork(struct work_struct *);
215 void aoecmd_wreset(struct aoetgt *t);
216 void aoecmd_cleanslate(struct aoedev *);
217 void aoecmd_exit(void);
218 int aoecmd_init(void);
219 struct sk_buff *aoecmd_ata_id(struct aoedev *);
220 void aoe_freetframe(struct frame *);
221 void aoe_flush_iocq(void);
222 void aoe_flush_iocq_by_index(int);
223 void aoe_end_request(struct aoedev *, struct request *, int);
224 int aoe_ktstart(struct ktstate *k);
225 void aoe_ktstop(struct ktstate *k);
227 int aoedev_init(void);
228 void aoedev_exit(void);
229 struct aoedev *aoedev_by_aoeaddr(ulong maj, int min, int do_alloc);
230 void aoedev_downdev(struct aoedev *d);
231 int aoedev_flush(const char __user *str, size_t size);
232 void aoe_failbuf(struct aoedev *, struct buf *);
233 void aoedev_put(struct aoedev *);
235 int aoenet_init(void);
236 void aoenet_exit(void);
237 void aoenet_xmit(struct sk_buff_head *);
238 int is_aoe_netif(struct net_device *ifp);
239 int set_aoe_iflist(const char __user *str, size_t size);