1/* Copyright (c) 2013 Coraid, Inc. See COPYING for GPL terms. */
2#include <linux/blk-mq.h>
3
4#define VERSION "85"
5#define AOE_MAJOR 152
6#define DEVICE_NAME "aoe"
7
8/* set AOE_PARTITIONS to 1 to use whole-disks only
9 * default is 16, which is 15 partitions plus the whole disk
10 */
11#ifndef AOE_PARTITIONS
12#define AOE_PARTITIONS (16)
13#endif
14
15#define WHITESPACE " \t\v\f\n,"
16
17enum {
18 AOECMD_ATA,
19 AOECMD_CFG,
20 AOECMD_VEND_MIN = 0xf0,
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
51struct aoe_atahdr {
52 unsigned char aflags;
53 unsigned char errfeat;
54 unsigned char scnt;
55 unsigned char cmdstat;
56 unsigned char lba0;
57 unsigned char lba1;
58 unsigned char lba2;
59 unsigned char lba3;
60 unsigned char lba4;
61 unsigned char lba5;
62 unsigned char res[2];
63};
64
65struct aoe_cfghdr {
66 __be16 bufcnt;
67 __be16 fwver;
68 unsigned char scnt;
69 unsigned char aoeccmd;
70 unsigned char cslen[2];
71};
72
73enum {
74 DEVFL_UP = 1, /* device is installed in system and ready for AoE->ATA commands */
75 DEVFL_TKILL = (1<<1), /* flag for timer to know when to kill self */
76 DEVFL_EXT = (1<<2), /* device accepts lba48 commands */
77 DEVFL_GDALLOC = (1<<3), /* need to alloc gendisk */
78 DEVFL_GD_NOW = (1<<4), /* allocating gendisk */
79 DEVFL_KICKME = (1<<5), /* slow polling network card catch */
80 DEVFL_NEWSIZE = (1<<6), /* need to update dev size in block layer */
81 DEVFL_FREEING = (1<<7), /* set when device is being cleaned up */
82 DEVFL_FREED = (1<<8), /* device has been cleaned up */
83};
84
85enum {
86 DEFAULTBCNT = 2 * 512, /* 2 sectors */
87 MIN_BUFS = 16,
88 NTARGETS = 4,
89 NAOEIFS = 8,
90 NSKBPOOLMAX = 256,
91 NFACTIVE = 61,
92
93 TIMERTICK = HZ / 10,
94 RTTSCALE = 8,
95 RTTDSCALE = 3,
96 RTTAVG_INIT = USEC_PER_SEC / 4 << RTTSCALE,
97 RTTDEV_INIT = RTTAVG_INIT / 4,
98
99 HARD_SCORN_SECS = 10, /* try another remote port after this */
100 MAX_TAINT = 1000, /* cap on aoetgt taint */
101};
102
103struct aoe_req {
104 unsigned long nr_bios;
105};
106
107struct buf {
108 ulong nframesout;
109 struct bio *bio;
110 struct bvec_iter iter;
111 struct request *rq;
112};
113
114enum frame_flags {
115 FFL_PROBE = 1,
116};
117
118struct frame {
119 struct list_head head;
120 u32 tag;
121 ktime_t sent; /* high-res time packet was sent */
122 ulong waited;
123 ulong waited_total;
124 struct aoetgt *t; /* parent target I belong to */
125 struct sk_buff *skb; /* command skb freed on module exit */
126 struct sk_buff *r_skb; /* response skb for async processing */
127 struct buf *buf;
128 struct bvec_iter iter;
129 char flags;
130};
131
132struct aoeif {
133 struct net_device *nd;
134 ulong lost;
135 int bcnt;
136};
137
138struct aoetgt {
139 unsigned char addr[6];
140 ushort nframes; /* cap on frames to use */
141 struct aoedev *d; /* parent device I belong to */
142 struct list_head ffree; /* list of free frames */
143 struct aoeif ifs[NAOEIFS];
144 struct aoeif *ifp; /* current aoeif in use */
145 ushort nout; /* number of AoE commands outstanding */
146 ushort maxout; /* current value for max outstanding */
147 ushort next_cwnd; /* incr maxout after decrementing to zero */
148 ushort ssthresh; /* slow start threshold */
149 ulong falloc; /* number of allocated frames */
150 int taint; /* how much we want to avoid this aoetgt */
151 int minbcnt;
152 int wpkts, rpkts;
153 char nout_probes;
154};
155
156struct aoedev {
157 struct aoedev *next;
158 ulong sysminor;
159 ulong aoemajor;
160 u32 rttavg; /* scaled AoE round trip time average */
161 u32 rttdev; /* scaled round trip time mean deviation */
162 u16 aoeminor;
163 u16 flags;
164 u16 nopen; /* (bd_openers isn't available without sleeping) */
165 u16 fw_ver; /* version of blade's firmware */
166 u16 lasttag; /* last tag sent */
167 u16 useme;
168 ulong ref;
169 struct work_struct work;/* disk create work struct */
170 struct gendisk *gd;
171 struct dentry *debugfs;
172 struct request_queue *blkq;
173 struct list_head rq_list;
174 struct blk_mq_tag_set tag_set;
175 struct hd_geometry geo;
176 sector_t ssize;
177 struct timer_list timer;
178 spinlock_t lock;
179 struct sk_buff_head skbpool;
180 mempool_t *bufpool; /* for deadlock-free Buf allocation */
181 struct { /* pointers to work in progress */
182 struct buf *buf;
183 struct bio *nxbio;
184 struct request *rq;
185 } ip;
186 ulong maxbcnt;
187 struct list_head factive[NFACTIVE]; /* hash of active frames */
188 struct list_head rexmitq; /* deferred retransmissions */
189 struct aoetgt **targets;
190 ulong ntargets; /* number of allocated aoetgt pointers */
191 struct aoetgt **tgt; /* target in use when working */
192 ulong kicked;
193 char ident[512];
194};
195
196/* kthread tracking */
197struct ktstate {
198 struct completion rendez;
199 struct task_struct *task;
200 wait_queue_head_t *waitq;
201 int (*fn) (int);
202 char name[12];
203 spinlock_t *lock;
204 int id;
205 int active;
206};
207
208int aoeblk_init(void);
209void aoeblk_exit(void);
210void aoeblk_gdalloc(void *);
211void aoedisk_rm_debugfs(struct aoedev *d);
212
213int aoechr_init(void);
214void aoechr_exit(void);
215void aoechr_error(char *);
216
217void aoecmd_work(struct aoedev *d);
218void aoecmd_cfg(ushort aoemajor, unsigned char aoeminor);
219struct sk_buff *aoecmd_ata_rsp(struct sk_buff *);
220void aoecmd_cfg_rsp(struct sk_buff *);
221void aoecmd_sleepwork(struct work_struct *);
222void aoecmd_wreset(struct aoetgt *t);
223void aoecmd_cleanslate(struct aoedev *);
224void aoecmd_exit(void);
225int aoecmd_init(void);
226struct sk_buff *aoecmd_ata_id(struct aoedev *);
227void aoe_freetframe(struct frame *);
228void aoe_flush_iocq(void);
229void aoe_flush_iocq_by_index(int);
230void aoe_end_request(struct aoedev *, struct request *, int);
231int aoe_ktstart(struct ktstate *k);
232void aoe_ktstop(struct ktstate *k);
233
234int aoedev_init(void);
235void aoedev_exit(void);
236struct aoedev *aoedev_by_aoeaddr(ulong maj, int min, int do_alloc);
237void aoedev_downdev(struct aoedev *d);
238int aoedev_flush(const char __user *str, size_t size);
239void aoe_failbuf(struct aoedev *, struct buf *);
240void aoedev_put(struct aoedev *);
241
242int aoenet_init(void);
243void aoenet_exit(void);
244void aoenet_xmit(struct sk_buff_head *);
245int is_aoe_netif(struct net_device *ifp);
246int set_aoe_iflist(const char __user *str, size_t size);
247
248extern struct workqueue_struct *aoe_wq;
249

source code of linux/drivers/block/aoe/aoe.h