LXR linux/drivers/block/aoe/aoe.h

   1/* Copyright (c) 2012 Coraid, Inc.  See COPYING for GPL terms. */
   2#define VERSION "81"
   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 WHITESPACE " \t\v\f\n,"
  14
  15enum {
  16        AOECMD_ATA,
  17        AOECMD_CFG,
  18        AOECMD_VEND_MIN = 0xf0,
  19
  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];
  40        __be16 type;
  41        unsigned char verfl;
  42        unsigned char err;
  43        __be16 major;
  44        unsigned char minor;
  45        unsigned char cmd;
  46        __be32 tag;
  47};
  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 {
  64        __be16 bufcnt;
  65        __be16 fwver;
  66        unsigned char scnt;
  67        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 */
  75        DEVFL_GDALLOC = (1<<3), /* need to alloc gendisk */
  76        DEVFL_GD_NOW = (1<<4),  /* allocating gendisk */
  77        DEVFL_KICKME = (1<<5),  /* slow polling network card catch */
  78        DEVFL_NEWSIZE = (1<<6), /* need to update dev size in block layer */
  79        DEVFL_FREEING = (1<<7), /* set when device is being cleaned up */
  80        DEVFL_FREED = (1<<8),   /* device has been cleaned up */
  81};
  82
  83enum {
  84        DEFAULTBCNT = 2 * 512,  /* 2 sectors */
  85        MIN_BUFS = 16,
  86        NTARGETS = 4,
  87        NAOEIFS = 8,
  88        NSKBPOOLMAX = 256,
  89        NFACTIVE = 61,
  90
  91        TIMERTICK = HZ / 10,
  92        RTTSCALE = 8,
  93        RTTDSCALE = 3,
  94        RTTAVG_INIT = USEC_PER_SEC / 4 << RTTSCALE,
  95        RTTDEV_INIT = RTTAVG_INIT / 4,
  96
  97        HARD_SCORN_SECS = 10,   /* try another remote port after this */
  98        MAX_TAINT = 1000,       /* cap on aoetgt taint */
  99};
 100
 101struct buf {
 102        ulong nframesout;
 103        ulong resid;
 104        ulong bv_resid;
 105        sector_t sector;
 106        struct bio *bio;
 107        struct bio_vec *bv;
 108        struct request *rq;
 109};
 110
 111enum frame_flags {
 112        FFL_PROBE = 1,
 113};
 114
 115struct frame {
 116        struct list_head head;
 117        u32 tag;
 118        struct timeval sent;    /* high-res time packet was sent */
 119        u32 sent_jiffs;         /* low-res jiffies-based sent time */
 120        ulong waited;
 121        ulong waited_total;
 122        struct aoetgt *t;               /* parent target I belong to */
 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 buf *buf;
 127        struct bio_vec *bv;
 128        ulong bcnt;
 129        ulong bv_off;
 130        char flags;
 131};
 132
 133struct aoeif {
 134        struct net_device *nd;
 135        ulong lost;
 136        int bcnt;
 137};
 138
 139struct aoetgt {
 140        unsigned char addr[6];
 141        ushort nframes;         /* cap on frames to use */
 142        struct aoedev *d;                       /* parent device I belong to */
 143        struct list_head ffree;                 /* list of free frames */
 144        struct aoeif ifs[NAOEIFS];
 145        struct aoeif *ifp;      /* current aoeif in use */
 146        ushort nout;            /* number of AoE commands outstanding */
 147        ushort maxout;          /* current value for max outstanding */
 148        ushort next_cwnd;       /* incr maxout after decrementing to zero */
 149        ushort ssthresh;        /* slow start threshold */
 150        ulong falloc;           /* number of allocated frames */
 151        int taint;              /* how much we want to avoid this aoetgt */
 152        int minbcnt;
 153        int wpkts, rpkts;
 154        char nout_probes;
 155};
 156
 157struct aoedev {
 158        struct aoedev *next;
 159        ulong sysminor;
 160        ulong aoemajor;
 161        u32 rttavg;             /* scaled AoE round trip time average */
 162        u32 rttdev;             /* scaled round trip time mean deviation */
 163        u16 aoeminor;
 164        u16 flags;
 165        u16 nopen;              /* (bd_openers isn't available without sleeping) */
 166        u16 fw_ver;             /* version of blade's firmware */
 167        u16 lasttag;            /* last tag sent */
 168        u16 useme;
 169        ulong ref;
 170        struct work_struct work;/* disk create work struct */
 171        struct gendisk *gd;
 172        struct request_queue *blkq;
 173        struct hd_geometry geo;
 174        sector_t ssize;
 175        struct timer_list timer;
 176        spinlock_t lock;
 177        struct sk_buff_head skbpool;
 178        mempool_t *bufpool;     /* for deadlock-free Buf allocation */
 179        struct {                /* pointers to work in progress */
 180                struct buf *buf;
 181                struct bio *nxbio;
 182                struct request *rq;
 183        } ip;
 184        ulong maxbcnt;
 185        struct list_head factive[NFACTIVE];     /* hash of active frames */
 186        struct list_head rexmitq; /* deferred retransmissions */
 187        struct aoetgt **targets;
 188        ulong ntargets;         /* number of allocated aoetgt pointers */
 189        struct aoetgt **tgt;    /* target in use when working */
 190        ulong kicked;
 191        char ident[512];
 192};
 193
 194/* kthread tracking */
 195struct ktstate {
 196        struct completion rendez;
 197        struct task_struct *task;
 198        wait_queue_head_t *waitq;
 199        int (*fn) (void);
 200        char *name;
 201        spinlock_t *lock;
 202};
 203
 204int aoeblk_init(void);
 205void aoeblk_exit(void);
 206void aoeblk_gdalloc(void *);
 207
 208int aoechr_init(void);
 209void aoechr_exit(void);
 210void aoechr_error(char *);
 211
 212void aoecmd_work(struct aoedev *d);
 213void aoecmd_cfg(ushort aoemajor, unsigned char aoeminor);
 214struct sk_buff *aoecmd_ata_rsp(struct sk_buff *);
 215void aoecmd_cfg_rsp(struct sk_buff *);
 216void aoecmd_sleepwork(struct work_struct *);
 217void aoecmd_wreset(struct aoetgt *t);
 218void aoecmd_cleanslate(struct aoedev *);
 219void aoecmd_exit(void);
 220int aoecmd_init(void);
 221struct sk_buff *aoecmd_ata_id(struct aoedev *);
 222void aoe_freetframe(struct frame *);
 223void aoe_flush_iocq(void);
 224void aoe_end_request(struct aoedev *, struct request *, int);
 225int aoe_ktstart(struct ktstate *k);
 226void aoe_ktstop(struct ktstate *k);
 227
 228int aoedev_init(void);
 229void aoedev_exit(void);
 230struct aoedev *aoedev_by_aoeaddr(ulong maj, int min, int do_alloc);
 231void aoedev_downdev(struct aoedev *d);
 232int aoedev_flush(const char __user *str, size_t size);
 233void aoe_failbuf(struct aoedev *, struct buf *);
 234void aoedev_put(struct aoedev *);
 235
 236int aoenet_init(void);
 237void aoenet_exit(void);
 238void aoenet_xmit(struct sk_buff_head *);
 239int is_aoe_netif(struct net_device *ifp);
 240int set_aoe_iflist(const char __user *str, size_t size);
 241