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
  22         AOEFL_RSP = (1<<3),
  23         AOEFL_ERR = (1<<2),
  24
  25         AOEAFL_EXT = (1<<6),
  26         AOEAFL_DEV = (1<<4),
  27         AOEAFL_ASYNC = (1<<1),
  28         AOEAFL_WRITE = (1<<0),
  29
  30         AOECCMD_READ = 0,
  31         AOECCMD_TEST,
  32         AOECCMD_PTEST,
  33         AOECCMD_SET,
  34         AOECCMD_FSET,
  35
  36         AOE_HVER = 0x10,
  37 };
  38
  39 struct aoe_hdr {
  40         unsigned char dst[6];
  41         unsigned char src[6];
  42         __be16 type;
  43         unsigned char verfl;
  44         unsigned char err;
  45         __be16 major;
  46         unsigned char minor;
  47         unsigned char cmd;
  48         __be32 tag;
  49 };
  50
  51 struct aoe_atahdr {
  52         unsigned char aflags;
  53         unsigned char errfeat;
  54         unsigned char scnt;
  55         unsigned char cmdstat;
  56         unsigned char lba0;
  57         unsigned char lba1;
  58         unsigned char lba2;
  59         unsigned char lba3;
  60         unsigned char lba4;
  61         unsigned char lba5;
  62         unsigned char res[2];
  63 };
  64
  65 struct aoe_cfghdr {
  66         __be16 bufcnt;
  67         __be16 fwver;
  68         unsigned char scnt;
  69         unsigned char aoeccmd;
  70         unsigned char cslen[2];
  71 };
  72
  73 enum {
  74         DEVFL_UP = 1,   /* device is installed in system and ready for AoE->ATA commands */
  75         DEVFL_TKILL = (1<<1),   /* flag for timer to know when to kill self */
  76         DEVFL_EXT = (1<<2),     /* device accepts lba48 commands */
  77         DEVFL_CLOSEWAIT = (1<<3), /* device is waiting for all closes to revalidate */
  78         DEVFL_GDALLOC = (1<<4), /* need to alloc gendisk */
  79         DEVFL_KICKME = (1<<5),  /* slow polling network card catch */
  80         DEVFL_NEWSIZE = (1<<6), /* need to update dev size in block layer */
  81
  82         BUFFL_FAIL = 1,
  83 };
  84
  85 enum {
  86         DEFAULTBCNT = 2 * 512,  /* 2 sectors */
  87         NPERSHELF = 16,         /* number of slots per shelf address */
  88         FREETAG = -1,
  89         MIN_BUFS = 16,
  90         NTARGETS = 8,
  91         NAOEIFS = 8,
  92         NSKBPOOLMAX = 128,
  93
  94         TIMERTICK = HZ / 10,
  95         MINTIMER = HZ >> 2,
  96         MAXTIMER = HZ << 1,
  97         HELPWAIT = 20,
  98 };
  99
 100 struct buf {
 101         struct list_head bufs;
 102         ulong stime;    /* for disk stats */
 103         ulong flags;
 104         ulong nframesout;
 105         ulong resid;
 106         ulong bv_resid;
 107         ulong bv_off;
 108         sector_t sector;
 109         struct bio *bio;
 110         struct bio_vec *bv;
 111 };
 112
 113 struct frame {
 114         int tag;
 115         ulong waited;
 116         struct buf *buf;
 117         char *bufaddr;
 118         ulong bcnt;
 119         sector_t lba;
 120         struct sk_buff *skb;
 121 };
 122
 123 struct aoeif {
 124         struct net_device *nd;
 125         unsigned char lost;
 126         unsigned char lostjumbo;
 127         ushort maxbcnt;
 128 };
 129
 130 struct aoetgt {
 131         unsigned char addr[6];
 132         ushort nframes;
 133         struct frame *frames;
 134         struct aoeif ifs[NAOEIFS];
 135         struct aoeif *ifp;      /* current aoeif in use */
 136         ushort nout;
 137         ushort maxout;
 138         u16 lasttag;            /* last tag sent */
 139         u16 useme;
 140         ulong lastwadj;         /* last window adjustment */
 141         int wpkts, rpkts;
 142         int dataref;
 143 };
 144
 145 struct aoedev {
 146         struct aoedev *next;
 147         ulong sysminor;
 148         ulong aoemajor;
 149         u16 aoeminor;
 150         u16 flags;
 151         u16 nopen;              /* (bd_openers isn't available without sleeping) */
 152         u16 rttavg;             /* round trip average of requests/responses */
 153         u16 mintimer;
 154         u16 fw_ver;             /* version of blade's firmware */
 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 sendq;
 163         struct sk_buff_head skbpool;
 164         mempool_t *bufpool;     /* for deadlock-free Buf allocation */
 165         struct list_head bufq;  /* queue of bios to work on */
 166         struct buf *inprocess;  /* the one we're currently working on */
 167         struct aoetgt *targets[NTARGETS];
 168         struct aoetgt **tgt;    /* target in use when working */
 169         struct aoetgt **htgt;   /* target needing rexmit assistance */
 170 };
 171
 172
 173 int aoeblk_init(void);
 174 void aoeblk_exit(void);
 175 void aoeblk_gdalloc(void *);
 176 void aoedisk_rm_sysfs(struct aoedev *d);
 177
 178 int aoechr_init(void);
 179 void aoechr_exit(void);
 180 void aoechr_error(char *);
 181
 182 void aoecmd_work(struct aoedev *d);
 183 void aoecmd_cfg(ushort aoemajor, unsigned char aoeminor);
 184 void aoecmd_ata_rsp(struct sk_buff *);
 185 void aoecmd_cfg_rsp(struct sk_buff *);
 186 void aoecmd_sleepwork(struct work_struct *);
 187 void aoecmd_cleanslate(struct aoedev *);
 188 struct sk_buff *aoecmd_ata_id(struct aoedev *);
 189
 190 int aoedev_init(void);
 191 void aoedev_exit(void);
 192 struct aoedev *aoedev_by_aoeaddr(int maj, int min);
 193 struct aoedev *aoedev_by_sysminor_m(ulong sysminor);
 194 void aoedev_downdev(struct aoedev *d);
 195 int aoedev_flush(const char __user *str, size_t size);
 196
 197 int aoenet_init(void);
 198 void aoenet_exit(void);
 199 void aoenet_xmit(struct sk_buff_head *);
 200 int is_aoe_netif(struct net_device *ifp);
 201 int set_aoe_iflist(const char __user *str, size_t size);
 202