drivers/block/aoe/aoe.h

   1 /* Copyright (c) 2007 Coraid, Inc.  See COPYING for GPL terms. */
   2 #define VERSION "49"
   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_GDALLOC = (1<<3), /* need to alloc gendisk */
  79         DEVFL_KICKME = (1<<4),  /* slow polling network card catch */
  80         DEVFL_NEWSIZE = (1<<5), /* need to update dev size in block layer */
  81 };
  82
  83 enum {
  84         DEFAULTBCNT = 2 * 512,  /* 2 sectors */
  85         NPERSHELF = 16,         /* number of slots per shelf address */
  86         MIN_BUFS = 16,
  87         NTARGETS = 8,
  88         NAOEIFS = 8,
  89         NSKBPOOLMAX = 256,
  90         NFACTIVE = 61,
  91
  92         TIMERTICK = HZ / 10,
  93         MINTIMER = HZ >> 2,
  94         MAXTIMER = HZ << 1,
  95 };
  96
  97 struct buf {
  98         ulong nframesout;
  99         ulong resid;
 100         ulong bv_resid;
 101         sector_t sector;
 102         struct bio *bio;
 103         struct bio_vec *bv;
 104         struct request *rq;
 105 };
 106
 107 struct frame {
 108         struct list_head head;
 109         u32 tag;
 110         ulong waited;
 111         struct aoetgt *t;               /* parent target I belong to */
 112         sector_t lba;
 113         struct sk_buff *skb;            /* command skb freed on module exit */
 114         struct sk_buff *r_skb;          /* response skb for async processing */
 115         struct buf *buf;
 116         struct bio_vec *bv;
 117         ulong bcnt;
 118         ulong bv_off;
 119 };
 120
 121 struct aoeif {
 122         struct net_device *nd;
 123         ulong lost;
 124         int bcnt;
 125 };
 126
 127 struct aoetgt {
 128         unsigned char addr[6];
 129         ushort nframes;
 130         struct aoedev *d;                       /* parent device I belong to */
 131         struct list_head ffree;                 /* list of free frames */
 132         struct aoeif ifs[NAOEIFS];
 133         struct aoeif *ifp;      /* current aoeif in use */
 134         ushort nout;
 135         ushort maxout;
 136         ulong falloc;
 137         ulong lastwadj;         /* last window adjustment */
 138         int minbcnt;
 139         int wpkts, rpkts;
 140 };
 141
 142 struct aoedev {
 143         struct aoedev *next;
 144         ulong sysminor;
 145         ulong aoemajor;
 146         u16 aoeminor;
 147         u16 flags;
 148         u16 nopen;              /* (bd_openers isn't available without sleeping) */
 149         u16 rttavg;             /* round trip average of requests/responses */
 150         u16 mintimer;
 151         u16 fw_ver;             /* version of blade's firmware */
 152         u16 lasttag;            /* last tag sent */
 153         u16 useme;
 154         ulong ref;
 155         struct work_struct work;/* disk create work struct */
 156         struct gendisk *gd;
 157         struct request_queue *blkq;
 158         struct hd_geometry geo;
 159         sector_t ssize;
 160         struct timer_list timer;
 161         spinlock_t lock;
 162         struct sk_buff_head skbpool;
 163         mempool_t *bufpool;     /* for deadlock-free Buf allocation */
 164         struct {                /* pointers to work in progress */
 165                 struct buf *buf;
 166                 struct bio *nxbio;
 167                 struct request *rq;
 168         } ip;
 169         ulong maxbcnt;
 170         struct list_head factive[NFACTIVE];     /* hash of active frames */
 171         struct aoetgt *targets[NTARGETS];
 172         struct aoetgt **tgt;    /* target in use when working */
 173         struct aoetgt *htgt;    /* target needing rexmit assistance */
 174         ulong ntargets;
 175         ulong kicked;
 176 };
 177
 178 /* kthread tracking */
 179 struct ktstate {
 180         struct completion rendez;
 181         struct task_struct *task;
 182         wait_queue_head_t *waitq;
 183         int (*fn) (void);
 184         char *name;
 185         spinlock_t *lock;
 186 };
 187
 188 int aoeblk_init(void);
 189 void aoeblk_exit(void);
 190 void aoeblk_gdalloc(void *);
 191 void aoedisk_rm_sysfs(struct aoedev *d);
 192
 193 int aoechr_init(void);
 194 void aoechr_exit(void);
 195 void aoechr_error(char *);
 196
 197 void aoecmd_work(struct aoedev *d);
 198 void aoecmd_cfg(ushort aoemajor, unsigned char aoeminor);
 199 struct sk_buff *aoecmd_ata_rsp(struct sk_buff *);
 200 void aoecmd_cfg_rsp(struct sk_buff *);
 201 void aoecmd_sleepwork(struct work_struct *);
 202 void aoecmd_cleanslate(struct aoedev *);
 203 void aoecmd_exit(void);
 204 int aoecmd_init(void);
 205 struct sk_buff *aoecmd_ata_id(struct aoedev *);
 206 void aoe_freetframe(struct frame *);
 207 void aoe_flush_iocq(void);
 208 void aoe_end_request(struct aoedev *, struct request *, int);
 209 int aoe_ktstart(struct ktstate *k);
 210 void aoe_ktstop(struct ktstate *k);
 211
 212 int aoedev_init(void);
 213 void aoedev_exit(void);
 214 struct aoedev *aoedev_by_aoeaddr(int maj, int min);
 215 struct aoedev *aoedev_by_sysminor_m(ulong sysminor);
 216 void aoedev_downdev(struct aoedev *d);
 217 int aoedev_flush(const char __user *str, size_t size);
 218 void aoe_failbuf(struct aoedev *, struct buf *);
 219 void aoedev_put(struct aoedev *);
 220
 221 int aoenet_init(void);
 222 void aoenet_exit(void);
 223 void aoenet_xmit(struct sk_buff_head *);
 224 int is_aoe_netif(struct net_device *ifp);
 225 int set_aoe_iflist(const char __user *str, size_t size);
 226