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Ed Cashinfea05a22012-10-04 17:16:38 -07001/* Copyright (c) 2012 Coraid, Inc. See COPYING for GPL terms. */
Ed Cashincd220bf2012-12-17 16:03:41 -08002#define VERSION "60"
Linus Torvalds1da177e2005-04-16 15:20:36 -07003#define AOE_MAJOR 152
4#define DEVICE_NAME "aoe"
ecashin@coraid.comfc458dc2005-04-18 22:00:17 -07005
6/* set AOE_PARTITIONS to 1 to use whole-disks only
7 * default is 16, which is 15 partitions plus the whole disk
8 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07009#ifndef AOE_PARTITIONS
Ed L Cashine39526e2005-08-19 16:54:43 -040010#define AOE_PARTITIONS (16)
Linus Torvalds1da177e2005-04-16 15:20:36 -070011#endif
ecashin@coraid.comfc458dc2005-04-18 22:00:17 -070012
Linus Torvalds1da177e2005-04-16 15:20:36 -070013#define WHITESPACE " \t\v\f\n"
14
15enum {
16 AOECMD_ATA,
17 AOECMD_CFG,
Ed Cashinb6d6c512009-02-18 14:48:13 -080018 AOECMD_VEND_MIN = 0xf0,
Linus Torvalds1da177e2005-04-16 15:20:36 -070019
20 AOEFL_RSP = (1<<3),
21 AOEFL_ERR = (1<<2),
22
23 AOEAFL_EXT = (1<<6),
24 AOEAFL_DEV = (1<<4),
25 AOEAFL_ASYNC = (1<<1),
26 AOEAFL_WRITE = (1<<0),
27
28 AOECCMD_READ = 0,
29 AOECCMD_TEST,
30 AOECCMD_PTEST,
31 AOECCMD_SET,
32 AOECCMD_FSET,
33
34 AOE_HVER = 0x10,
35};
36
37struct aoe_hdr {
38 unsigned char dst[6];
39 unsigned char src[6];
ecashin@coraid.com63e9cc52005-04-18 22:00:20 -070040 __be16 type;
Linus Torvalds1da177e2005-04-16 15:20:36 -070041 unsigned char verfl;
42 unsigned char err;
ecashin@coraid.com63e9cc52005-04-18 22:00:20 -070043 __be16 major;
Linus Torvalds1da177e2005-04-16 15:20:36 -070044 unsigned char minor;
45 unsigned char cmd;
ecashin@coraid.com63e9cc52005-04-18 22:00:20 -070046 __be32 tag;
Linus Torvalds1da177e2005-04-16 15:20:36 -070047};
48
49struct 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];
61};
62
63struct aoe_cfghdr {
ecashin@coraid.com63e9cc52005-04-18 22:00:20 -070064 __be16 bufcnt;
65 __be16 fwver;
Ed L. Cashin19bf2632006-09-20 14:36:49 -040066 unsigned char scnt;
Linus Torvalds1da177e2005-04-16 15:20:36 -070067 unsigned char aoeccmd;
68 unsigned char cslen[2];
69};
70
71enum {
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 */
Ed Cashinb21faa22012-10-04 17:16:35 -070075 DEVFL_GDALLOC = (1<<3), /* need to alloc gendisk */
76 DEVFL_KICKME = (1<<4), /* slow polling network card catch */
77 DEVFL_NEWSIZE = (1<<5), /* need to update dev size in block layer */
Linus Torvalds1da177e2005-04-16 15:20:36 -070078};
79
80enum {
Ed L. Cashin19bf2632006-09-20 14:36:49 -040081 DEFAULTBCNT = 2 * 512, /* 2 sectors */
Ed L. Cashin68e0d422008-02-08 04:20:00 -080082 MIN_BUFS = 16,
83 NTARGETS = 8,
84 NAOEIFS = 8,
Ed Cashin69cf2d852012-10-04 17:16:23 -070085 NSKBPOOLMAX = 256,
Ed Cashin64a80f52012-10-04 17:16:33 -070086 NFACTIVE = 61,
Ed L. Cashin68e0d422008-02-08 04:20:00 -080087
88 TIMERTICK = HZ / 10,
Ed Cashin3a0c40d2012-12-17 16:03:43 -080089 RTTSCALE = 8,
90 RTTDSCALE = 3,
Ed Cashin5f0c9c42012-12-17 16:03:49 -080091 RTTAVG_INIT = USEC_PER_SEC / 4 << RTTSCALE,
Ed Cashin3a0c40d2012-12-17 16:03:43 -080092 RTTDEV_INIT = RTTAVG_INIT / 4,
Linus Torvalds1da177e2005-04-16 15:20:36 -070093};
94
95struct buf {
Linus Torvalds1da177e2005-04-16 15:20:36 -070096 ulong nframesout;
Linus Torvalds1da177e2005-04-16 15:20:36 -070097 ulong resid;
98 ulong bv_resid;
99 sector_t sector;
100 struct bio *bio;
101 struct bio_vec *bv;
Ed Cashin69cf2d852012-10-04 17:16:23 -0700102 struct request *rq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103};
104
105struct frame {
Ed Cashin896831f2012-10-04 17:16:21 -0700106 struct list_head head;
107 u32 tag;
Ed Cashin5f0c9c42012-12-17 16:03:49 -0800108 struct timeval sent; /* high-res time packet was sent */
109 u32 sent_jiffs; /* low-res jiffies-based sent time */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110 ulong waited;
Ed Cashin896831f2012-10-04 17:16:21 -0700111 struct aoetgt *t; /* parent target I belong to */
Ed L. Cashin19bf2632006-09-20 14:36:49 -0400112 sector_t lba;
Ed Cashin896831f2012-10-04 17:16:21 -0700113 struct sk_buff *skb; /* command skb freed on module exit */
114 struct sk_buff *r_skb; /* response skb for async processing */
Ed Cashin69cf2d852012-10-04 17:16:23 -0700115 struct buf *buf;
Ed Cashin3d5b0602012-10-04 17:16:20 -0700116 struct bio_vec *bv;
Ed Cashin69cf2d852012-10-04 17:16:23 -0700117 ulong bcnt;
Ed Cashin3d5b0602012-10-04 17:16:20 -0700118 ulong bv_off;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119};
120
Ed L. Cashin68e0d422008-02-08 04:20:00 -0800121struct aoeif {
122 struct net_device *nd;
Ed Cashin3f0f0132012-10-04 17:16:27 -0700123 ulong lost;
124 int bcnt;
Ed L. Cashin68e0d422008-02-08 04:20:00 -0800125};
126
127struct aoetgt {
128 unsigned char addr[6];
Ed Cashin1b8a1632012-12-17 16:03:29 -0800129 ushort nframes; /* cap on frames to use */
Ed Cashin896831f2012-10-04 17:16:21 -0700130 struct aoedev *d; /* parent device I belong to */
Ed Cashin896831f2012-10-04 17:16:21 -0700131 struct list_head ffree; /* list of free frames */
Ed L. Cashin68e0d422008-02-08 04:20:00 -0800132 struct aoeif ifs[NAOEIFS];
133 struct aoeif *ifp; /* current aoeif in use */
Ed Cashin3a0c40d2012-12-17 16:03:43 -0800134 ushort nout; /* value of nout when skb was sent */
Ed Cashin1b8a1632012-12-17 16:03:29 -0800135 ushort maxout; /* current value for max outstanding */
Ed Cashin3a0c40d2012-12-17 16:03:43 -0800136 ushort next_cwnd; /* incr maxout after decrementing to zero */
137 ushort ssthresh; /* slow start threshold */
Ed Cashin1b8a1632012-12-17 16:03:29 -0800138 ulong falloc; /* number of allocated frames */
Ed Cashin3f0f0132012-10-04 17:16:27 -0700139 int minbcnt;
Ed L. Cashin68e0d422008-02-08 04:20:00 -0800140 int wpkts, rpkts;
141};
142
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143struct aoedev {
144 struct aoedev *next;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 ulong sysminor;
146 ulong aoemajor;
Ed Cashin5f0c9c42012-12-17 16:03:49 -0800147 u32 rttavg; /* scaled AoE round trip time average */
148 u32 rttdev; /* scaled round trip time mean deviation */
Ed L. Cashin68e0d422008-02-08 04:20:00 -0800149 u16 aoeminor;
150 u16 flags;
Ed L. Cashindced3a02006-09-20 14:36:49 -0400151 u16 nopen; /* (bd_openers isn't available without sleeping) */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152 u16 fw_ver; /* version of blade's firmware */
Ed Cashin64a80f52012-10-04 17:16:33 -0700153 u16 lasttag; /* last tag sent */
154 u16 useme;
Ed Cashin69cf2d852012-10-04 17:16:23 -0700155 ulong ref;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 struct work_struct work;/* disk create work struct */
157 struct gendisk *gd;
Ed Cashin7135a71b2009-09-09 14:10:18 +0200158 struct request_queue *blkq;
Ed Cashina04b41c2012-12-17 16:03:39 -0800159 struct hd_geometry geo;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160 sector_t ssize;
161 struct timer_list timer;
162 spinlock_t lock;
David S. Millere9bb8fb02008-09-21 22:36:49 -0700163 struct sk_buff_head skbpool;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 mempool_t *bufpool; /* for deadlock-free Buf allocation */
Ed Cashin69cf2d852012-10-04 17:16:23 -0700165 struct { /* pointers to work in progress */
166 struct buf *buf;
167 struct bio *nxbio;
168 struct request *rq;
169 } ip;
Ed Cashin3f0f0132012-10-04 17:16:27 -0700170 ulong maxbcnt;
Ed Cashin64a80f52012-10-04 17:16:33 -0700171 struct list_head factive[NFACTIVE]; /* hash of active frames */
Ed Cashin3a0c40d2012-12-17 16:03:43 -0800172 struct list_head rexmitq; /* deferred retransmissions */
Ed L. Cashin68e0d422008-02-08 04:20:00 -0800173 struct aoetgt *targets[NTARGETS];
174 struct aoetgt **tgt; /* target in use when working */
Ed Cashin896831f2012-10-04 17:16:21 -0700175 struct aoetgt *htgt; /* target needing rexmit assistance */
176 ulong ntargets;
177 ulong kicked;
Ed Cashin667be1e2012-12-17 16:03:42 -0800178 char ident[512];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179};
180
Ed Cashin896831f2012-10-04 17:16:21 -0700181/* kthread tracking */
182struct ktstate {
183 struct completion rendez;
184 struct task_struct *task;
185 wait_queue_head_t *waitq;
186 int (*fn) (void);
187 char *name;
188 spinlock_t *lock;
189};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190
191int aoeblk_init(void);
192void aoeblk_exit(void);
193void aoeblk_gdalloc(void *);
194void aoedisk_rm_sysfs(struct aoedev *d);
195
196int aoechr_init(void);
197void aoechr_exit(void);
198void aoechr_error(char *);
199
200void aoecmd_work(struct aoedev *d);
Ed L. Cashin3ae1c242006-01-19 13:46:19 -0500201void aoecmd_cfg(ushort aoemajor, unsigned char aoeminor);
Ed Cashin896831f2012-10-04 17:16:21 -0700202struct sk_buff *aoecmd_ata_rsp(struct sk_buff *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203void aoecmd_cfg_rsp(struct sk_buff *);
David Howellsc4028952006-11-22 14:57:56 +0000204void aoecmd_sleepwork(struct work_struct *);
Ed Cashin3a0c40d2012-12-17 16:03:43 -0800205void aoecmd_wreset(struct aoetgt *t);
Ed L. Cashin68e0d422008-02-08 04:20:00 -0800206void aoecmd_cleanslate(struct aoedev *);
Ed Cashin896831f2012-10-04 17:16:21 -0700207void aoecmd_exit(void);
208int aoecmd_init(void);
Ed L. Cashin68e0d422008-02-08 04:20:00 -0800209struct sk_buff *aoecmd_ata_id(struct aoedev *);
Ed Cashin896831f2012-10-04 17:16:21 -0700210void aoe_freetframe(struct frame *);
Ed Cashin69cf2d852012-10-04 17:16:23 -0700211void aoe_flush_iocq(void);
212void aoe_end_request(struct aoedev *, struct request *, int);
Ed Cashineb086ec2012-10-04 17:16:25 -0700213int aoe_ktstart(struct ktstate *k);
214void aoe_ktstop(struct ktstate *k);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215
216int aoedev_init(void);
217void aoedev_exit(void);
Ed Cashin0c966212012-10-04 17:16:40 -0700218struct aoedev *aoedev_by_aoeaddr(ulong maj, int min, int do_alloc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219void aoedev_downdev(struct aoedev *d);
Ed L. Cashin262bf542008-02-08 04:20:03 -0800220int aoedev_flush(const char __user *str, size_t size);
Ed Cashin69cf2d852012-10-04 17:16:23 -0700221void aoe_failbuf(struct aoedev *, struct buf *);
222void aoedev_put(struct aoedev *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223
224int aoenet_init(void);
225void aoenet_exit(void);
David S. Millere9bb8fb02008-09-21 22:36:49 -0700226void aoenet_xmit(struct sk_buff_head *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227int is_aoe_netif(struct net_device *ifp);
228int set_aoe_iflist(const char __user *str, size_t size);