drivers/block/aoe/aoe.h

   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         NFACTIVE = 17,
  95
  96         TIMERTICK = HZ / 10,
  97         MINTIMER = HZ >> 2,
  98         MAXTIMER = HZ << 1,
  99         HELPWAIT = 20,
 100 };
 101
 102 struct buf {
 103         struct list_head bufs;
 104         ulong stime;    /* for disk stats */
 105         ulong flags;
 106         ulong nframesout;
 107         ulong resid;
 108         ulong bv_resid;
 109         ulong bv_off;
 110         sector_t sector;
 111         struct bio *bio;
 112         struct bio_vec *bv;
 113 };
 114
 115 struct frame {
 116         struct list_head head;
 117         u32 tag;
 118         ulong waited;
 119         struct buf *buf;
 120         struct aoetgt *t;               /* parent target I belong to */
 121         char *bufaddr;
 122         ulong bcnt;
 123         sector_t lba;
 124         struct sk_buff *skb;            /* command skb freed on module exit */
 125         struct sk_buff *r_skb;          /* response skb for async processing */
 126         struct bio_vec *bv;
 127         ulong bv_off;
 128 };
 129
 130 struct aoeif {
 131         struct net_device *nd;
 132         unsigned char lost;
 133         unsigned char lostjumbo;
 134         ushort maxbcnt;
 135 };
 136
 137 struct aoetgt {
 138         unsigned char addr[6];
 139         ushort nframes;
 140         struct aoedev *d;                       /* parent device I belong to */
 141         struct list_head factive[NFACTIVE];     /* hash of active frames */
 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;
 146         ushort maxout;
 147         u16 lasttag;            /* last tag sent */
 148         u16 useme;
 149         ulong falloc;
 150         ulong lastwadj;         /* last window adjustment */
 151         int wpkts, rpkts;
 152 };
 153
 154 struct aoedev {
 155         struct aoedev *next;
 156         ulong sysminor;
 157         ulong aoemajor;
 158         u16 aoeminor;
 159         u16 flags;
 160         u16 nopen;              /* (bd_openers isn't available without sleeping) */
 161         u16 rttavg;             /* round trip average of requests/responses */
 162         u16 mintimer;
 163         u16 fw_ver;             /* version of blade's firmware */
 164         struct work_struct work;/* disk create work struct */
 165         struct gendisk *gd;
 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 sendq;
 172         struct sk_buff_head skbpool;
 173         mempool_t *bufpool;     /* for deadlock-free Buf allocation */
 174         struct list_head bufq;  /* queue of bios to work on */
 175         struct buf *inprocess;  /* the one we're currently working on */
 176         struct aoetgt *targets[NTARGETS];
 177         struct aoetgt **tgt;    /* target in use when working */
 178         struct aoetgt *htgt;    /* target needing rexmit assistance */
 179         ulong ntargets;
 180         ulong kicked;
 181 };
 182
 183 /* kthread tracking */
 184 struct ktstate {
 185         struct completion rendez;
 186         struct task_struct *task;
 187         wait_queue_head_t *waitq;
 188         int (*fn) (void);
 189         char *name;
 190         spinlock_t *lock;
 191 };
 192
 193 int aoeblk_init(void);
 194 void aoeblk_exit(void);
 195 void aoeblk_gdalloc(void *);
 196 void aoedisk_rm_sysfs(struct aoedev *d);
 197
 198 int aoechr_init(void);
 199 void aoechr_exit(void);
 200 void aoechr_error(char *);
 201
 202 void aoecmd_work(struct aoedev *d);
 203 void aoecmd_cfg(ushort aoemajor, unsigned char aoeminor);
 204 struct sk_buff *aoecmd_ata_rsp(struct sk_buff *);
 205 void aoecmd_cfg_rsp(struct sk_buff *);
 206 void aoecmd_sleepwork(struct work_struct *);
 207 void aoecmd_cleanslate(struct aoedev *);
 208 void aoecmd_exit(void);
 209 int aoecmd_init(void);
 210 struct sk_buff *aoecmd_ata_id(struct aoedev *);
 211 void aoe_freetframe(struct frame *);
 212
 213 int aoedev_init(void);
 214 void aoedev_exit(void);
 215 struct aoedev *aoedev_by_aoeaddr(int maj, int min);
 216 struct aoedev *aoedev_by_sysminor_m(ulong sysminor);
 217 void aoedev_downdev(struct aoedev *d);
 218 int aoedev_flush(const char __user *str, size_t size);
 219 void aoe_failbuf(struct aoedev *d, struct buf *buf);
 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