LXR linux/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
  18enum {
  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
  40struct 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
  52struct 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
  66struct aoe_cfghdr {
  67        __be16 bufcnt;
  68        __be16 fwver;
  69        unsigned char scnt;
  70        unsigned char aoeccmd;
  71        unsigned char cslen[2];
  72};
  73
  74enum {
  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
  86enum {
  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
  95        TIMERTICK = HZ / 10,
  96        MINTIMER = HZ >> 2,
  97        MAXTIMER = HZ << 1,
  98        HELPWAIT = 20,
  99};
 100
 101struct buf {
 102        struct list_head bufs;
 103        ulong stime;    /* for disk stats */
 104        ulong flags;
 105        ulong nframesout;
 106        ulong resid;
 107        ulong bv_resid;
 108        ulong bv_off;
 109        sector_t sector;
 110        struct bio *bio;
 111        struct bio_vec *bv;
 112};
 113
 114struct frame {
 115        int tag;
 116        ulong waited;
 117        struct buf *buf;
 118        char *bufaddr;
 119        ulong bcnt;
 120        sector_t lba;
 121        struct sk_buff *skb;
 122};
 123
 124struct aoeif {
 125        struct net_device *nd;
 126        unsigned char lost;
 127        unsigned char lostjumbo;
 128        ushort maxbcnt;
 129};
 130
 131struct aoetgt {
 132        unsigned char addr[6];
 133        ushort nframes;
 134        struct frame *frames;
 135        struct aoeif ifs[NAOEIFS];
 136        struct aoeif *ifp;      /* current aoeif in use */
 137        ushort nout;
 138        ushort maxout;
 139        u16 lasttag;            /* last tag sent */
 140        u16 useme;
 141        ulong lastwadj;         /* last window adjustment */
 142        int wpkts, rpkts;
 143        int dataref;
 144};
 145
 146struct aoedev {
 147        struct aoedev *next;
 148        ulong sysminor;
 149        ulong aoemajor;
 150        u16 aoeminor;
 151        u16 flags;
 152        u16 nopen;              /* (bd_openers isn't available without sleeping) */
 153        u16 rttavg;             /* round trip average of requests/responses */
 154        u16 mintimer;
 155        u16 fw_ver;             /* version of blade's firmware */
 156        struct work_struct work;/* disk create work struct */
 157        struct gendisk *gd;
 158        struct request_queue *blkq;
 159        struct hd_geometry geo; 
 160        sector_t ssize;
 161        struct timer_list timer;
 162        spinlock_t lock;
 163        struct sk_buff_head sendq;
 164        struct sk_buff_head skbpool;
 165        mempool_t *bufpool;     /* for deadlock-free Buf allocation */
 166        struct list_head bufq;  /* queue of bios to work on */
 167        struct buf *inprocess;  /* the one we're currently working on */
 168        struct aoetgt *targets[NTARGETS];
 169        struct aoetgt **tgt;    /* target in use when working */
 170        struct aoetgt **htgt;   /* target needing rexmit assistance */
 171};
 172
 173
 174int aoeblk_init(void);
 175void aoeblk_exit(void);
 176void aoeblk_gdalloc(void *);
 177void aoedisk_rm_sysfs(struct aoedev *d);
 178
 179int aoechr_init(void);
 180void aoechr_exit(void);
 181void aoechr_error(char *);
 182
 183void aoecmd_work(struct aoedev *d);
 184void aoecmd_cfg(ushort aoemajor, unsigned char aoeminor);
 185void aoecmd_ata_rsp(struct sk_buff *);
 186void aoecmd_cfg_rsp(struct sk_buff *);
 187void aoecmd_sleepwork(struct work_struct *);
 188void aoecmd_cleanslate(struct aoedev *);
 189struct sk_buff *aoecmd_ata_id(struct aoedev *);
 190
 191int aoedev_init(void);
 192void aoedev_exit(void);
 193struct aoedev *aoedev_by_aoeaddr(int maj, int min);
 194struct aoedev *aoedev_by_sysminor_m(ulong sysminor);
 195void aoedev_downdev(struct aoedev *d);
 196int aoedev_flush(const char __user *str, size_t size);
 197
 198int aoenet_init(void);
 199void aoenet_exit(void);
 200void aoenet_xmit(struct sk_buff_head *);
 201int is_aoe_netif(struct net_device *ifp);
 202int set_aoe_iflist(const char __user *str, size_t size);
 203
 204