drivers/block/aoe/aoe.h

   1 /* Copyright (c) 2012 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 #define AOE_MAXSHELF (0xffff-1) /* one less than the broadcast shelf address */
  53
  54 struct aoe_atahdr {
  55         unsigned char aflags;
  56         unsigned char errfeat;
  57         unsigned char scnt;
  58         unsigned char cmdstat;
  59         unsigned char lba0;
  60         unsigned char lba1;
  61         unsigned char lba2;
  62         unsigned char lba3;
  63         unsigned char lba4;
  64         unsigned char lba5;
  65         unsigned char res[2];
  66 };
  67
  68 struct aoe_cfghdr {
  69         __be16 bufcnt;
  70         __be16 fwver;
  71         unsigned char scnt;
  72         unsigned char aoeccmd;
  73         unsigned char cslen[2];
  74 };
  75
  76 enum {
  77         DEVFL_UP = 1,   /* device is installed in system and ready for AoE->ATA commands */
  78         DEVFL_TKILL = (1<<1),   /* flag for timer to know when to kill self */
  79         DEVFL_EXT = (1<<2),     /* device accepts lba48 commands */
  80         DEVFL_GDALLOC = (1<<3), /* need to alloc gendisk */
  81         DEVFL_KICKME = (1<<4),  /* slow polling network card catch */
  82         DEVFL_NEWSIZE = (1<<5), /* need to update dev size in block layer */
  83 };
  84
  85 enum {
  86         DEFAULTBCNT = 2 * 512,  /* 2 sectors */
  87         NPERSHELF = 16,         /* number of slots per shelf address */
  88         MIN_BUFS = 16,
  89         NTARGETS = 8,
  90         NAOEIFS = 8,
  91         NSKBPOOLMAX = 256,
  92         NFACTIVE = 61,
  93
  94         TIMERTICK = HZ / 10,
  95         MINTIMER = HZ >> 2,
  96         MAXTIMER = HZ << 1,
  97 };
  98
  99 struct buf {
 100         ulong nframesout;
 101         ulong resid;
 102         ulong bv_resid;
 103         sector_t sector;
 104         struct bio *bio;
 105         struct bio_vec *bv;
 106         struct request *rq;
 107 };
 108
 109 struct frame {
 110         struct list_head head;
 111         u32 tag;
 112         ulong waited;
 113         struct aoetgt *t;               /* parent target I belong to */
 114         sector_t lba;
 115         struct sk_buff *skb;            /* command skb freed on module exit */
 116         struct sk_buff *r_skb;          /* response skb for async processing */
 117         struct buf *buf;
 118         struct bio_vec *bv;
 119         ulong bcnt;
 120         ulong bv_off;
 121 };
 122
 123 struct aoeif {
 124         struct net_device *nd;
 125         ulong lost;
 126         int bcnt;
 127 };
 128
 129 struct aoetgt {
 130         unsigned char addr[6];
 131         ushort nframes;
 132         struct aoedev *d;                       /* parent device I belong to */
 133         struct list_head ffree;                 /* list of free frames */
 134         struct aoeif ifs[NAOEIFS];
 135         struct aoeif *ifp;      /* current aoeif in use */
 136         ushort nout;
 137         ushort maxout;
 138         ulong falloc;
 139         ulong lastwadj;         /* last window adjustment */
 140         int minbcnt;
 141         int wpkts, rpkts;
 142 };
 143
 144 struct aoedev {
 145         struct aoedev *next;
 146         ulong sysminor;
 147         ulong aoemajor;
 148         u16 aoeminor;
 149         u16 flags;
 150         u16 nopen;              /* (bd_openers isn't available without sleeping) */
 151         u16 rttavg;             /* round trip average of requests/responses */
 152         u16 mintimer;
 153         u16 fw_ver;             /* version of blade's firmware */
 154         u16 lasttag;            /* last tag sent */
 155         u16 useme;
 156         ulong ref;
 157         struct work_struct work;/* disk create work struct */
 158         struct gendisk *gd;
 159         struct request_queue *blkq;
 160         struct hd_geometry geo;
 161         sector_t ssize;
 162         struct timer_list timer;
 163         spinlock_t lock;
 164         struct sk_buff_head skbpool;
 165         mempool_t *bufpool;     /* for deadlock-free Buf allocation */
 166         struct {                /* pointers to work in progress */
 167                 struct buf *buf;
 168                 struct bio *nxbio;
 169                 struct request *rq;
 170         } ip;
 171         ulong maxbcnt;
 172         struct list_head factive[NFACTIVE];     /* hash of active frames */
 173         struct aoetgt *targets[NTARGETS];
 174         struct aoetgt **tgt;    /* target in use when working */
 175         struct aoetgt *htgt;    /* target needing rexmit assistance */
 176         ulong ntargets;
 177         ulong kicked;
 178 };
 179
 180 /* kthread tracking */
 181 struct ktstate {
 182         struct completion rendez;
 183         struct task_struct *task;
 184         wait_queue_head_t *waitq;
 185         int (*fn) (void);
 186         char *name;
 187         spinlock_t *lock;
 188 };
 189
 190 int aoeblk_init(void);
 191 void aoeblk_exit(void);
 192 void aoeblk_gdalloc(void *);
 193 void aoedisk_rm_sysfs(struct aoedev *d);
 194
 195 int aoechr_init(void);
 196 void aoechr_exit(void);
 197 void aoechr_error(char *);
 198
 199 void aoecmd_work(struct aoedev *d);
 200 void aoecmd_cfg(ushort aoemajor, unsigned char aoeminor);
 201 struct sk_buff *aoecmd_ata_rsp(struct sk_buff *);
 202 void aoecmd_cfg_rsp(struct sk_buff *);
 203 void aoecmd_sleepwork(struct work_struct *);
 204 void aoecmd_cleanslate(struct aoedev *);
 205 void aoecmd_exit(void);
 206 int aoecmd_init(void);
 207 struct sk_buff *aoecmd_ata_id(struct aoedev *);
 208 void aoe_freetframe(struct frame *);
 209 void aoe_flush_iocq(void);
 210 void aoe_end_request(struct aoedev *, struct request *, int);
 211 int aoe_ktstart(struct ktstate *k);
 212 void aoe_ktstop(struct ktstate *k);
 213
 214 int aoedev_init(void);
 215 void aoedev_exit(void);
 216 struct aoedev *aoedev_by_aoeaddr(ulong maj, int min, int do_alloc);
 217 void aoedev_downdev(struct aoedev *d);
 218 int aoedev_flush(const char __user *str, size_t size);
 219 void aoe_failbuf(struct aoedev *, struct buf *);
 220 void aoedev_put(struct aoedev *);
 221
 222 int aoenet_init(void);
 223 void aoenet_exit(void);
 224 void aoenet_xmit(struct sk_buff_head *);
 225 int is_aoe_netif(struct net_device *ifp);
 226 int set_aoe_iflist(const char __user *str, size_t size);