drivers/block/aoe/aoe.h

   1 /* Copyright (c) 2004 Coraid, Inc.  See COPYING for GPL terms. */
   2 #define VERSION "5"
   3 #define AOE_MAJOR 152
   4 #define DEVICE_NAME "aoe"
   5 #ifndef AOE_PARTITIONS
   6 #define AOE_PARTITIONS 16
   7 #endif
   8 #define SYSMINOR(aoemajor, aoeminor) ((aoemajor) * 10 + (aoeminor))
   9 #define AOEMAJOR(sysminor) ((sysminor) / 10)
  10 #define AOEMINOR(sysminor) ((sysminor) % 10)
  11 #define WHITESPACE " \t\v\f\n"
  12
  13 enum {
  14         AOECMD_ATA,
  15         AOECMD_CFG,
  16
  17         AOEFL_RSP = (1<<3),
  18         AOEFL_ERR = (1<<2),
  19
  20         AOEAFL_EXT = (1<<6),
  21         AOEAFL_DEV = (1<<4),
  22         AOEAFL_ASYNC = (1<<1),
  23         AOEAFL_WRITE = (1<<0),
  24
  25         AOECCMD_READ = 0,
  26         AOECCMD_TEST,
  27         AOECCMD_PTEST,
  28         AOECCMD_SET,
  29         AOECCMD_FSET,
  30
  31         AOE_HVER = 0x10,
  32 };
  33
  34 struct aoe_hdr {
  35         unsigned char dst[6];
  36         unsigned char src[6];
  37         unsigned char type[2];
  38         unsigned char verfl;
  39         unsigned char err;
  40         unsigned char major[2];
  41         unsigned char minor;
  42         unsigned char cmd;
  43         unsigned char tag[4];
  44 };
  45
  46 struct aoe_atahdr {
  47         unsigned char aflags;
  48         unsigned char errfeat;
  49         unsigned char scnt;
  50         unsigned char cmdstat;
  51         unsigned char lba0;
  52         unsigned char lba1;
  53         unsigned char lba2;
  54         unsigned char lba3;
  55         unsigned char lba4;
  56         unsigned char lba5;
  57         unsigned char res[2];
  58 };
  59
  60 struct aoe_cfghdr {
  61         unsigned char bufcnt[2];
  62         unsigned char fwver[2];
  63         unsigned char res;
  64         unsigned char aoeccmd;
  65         unsigned char cslen[2];
  66 };
  67
  68 enum {
  69         DEVFL_UP = 1,   /* device is installed in system and ready for AoE->ATA commands */
  70         DEVFL_TKILL = (1<<1),   /* flag for timer to know when to kill self */
  71         DEVFL_EXT = (1<<2),     /* device accepts lba48 commands */
  72         DEVFL_CLOSEWAIT = (1<<3), /* device is waiting for all closes to revalidate */
  73         DEVFL_WC_UPDATE = (1<<4), /* this device needs to update write cache status */
  74         DEVFL_WORKON = (1<<4),
  75
  76         BUFFL_FAIL = 1,
  77 };
  78
  79 enum {
  80         MAXATADATA = 1024,
  81         NPERSHELF = 10,
  82         FREETAG = -1,
  83         MIN_BUFS = 8,
  84 };
  85
  86 struct buf {
  87         struct list_head bufs;
  88         ulong flags;
  89         ulong nframesout;
  90         char *bufaddr;
  91         ulong resid;
  92         ulong bv_resid;
  93         sector_t sector;
  94         struct bio *bio;
  95         struct bio_vec *bv;
  96 };
  97
  98 struct frame {
  99         int tag;
 100         ulong waited;
 101         struct buf *buf;
 102         char *bufaddr;
 103         int writedatalen;
 104         int ndata;
 105
 106         /* largest possible */
 107         unsigned char data[sizeof(struct aoe_hdr) + sizeof(struct aoe_atahdr)];
 108 };
 109
 110 struct aoedev {
 111         struct aoedev *next;
 112         unsigned char addr[6];  /* remote mac addr */
 113         ushort flags;
 114         ulong sysminor;
 115         ulong aoemajor;
 116         ulong aoeminor;
 117         ulong nopen;            /* (bd_openers isn't available without sleeping) */
 118         ulong rttavg;           /* round trip average of requests/responses */
 119         u16 fw_ver;             /* version of blade's firmware */
 120         struct work_struct work;/* disk create work struct */
 121         struct gendisk *gd;
 122         request_queue_t blkq;
 123         struct hd_geometry geo;
 124         sector_t ssize;
 125         struct timer_list timer;
 126         spinlock_t lock;
 127         struct net_device *ifp; /* interface ed is attached to */
 128         struct sk_buff *skblist;/* packets needing to be sent */
 129         mempool_t *bufpool;     /* for deadlock-free Buf allocation */
 130         struct list_head bufq;  /* queue of bios to work on */
 131         struct buf *inprocess;  /* the one we're currently working on */
 132         ulong lasttag;          /* last tag sent */
 133         ulong nframes;          /* number of frames below */
 134         struct frame *frames;
 135 };
 136
 137
 138 int aoeblk_init(void);
 139 void aoeblk_exit(void);
 140 void aoeblk_gdalloc(void *);
 141 void aoedisk_rm_sysfs(struct aoedev *d);
 142
 143 int aoechr_init(void);
 144 void aoechr_exit(void);
 145 void aoechr_error(char *);
 146
 147 void aoecmd_work(struct aoedev *d);
 148 void aoecmd_cfg(ushort, unsigned char);
 149 void aoecmd_ata_rsp(struct sk_buff *);
 150 void aoecmd_cfg_rsp(struct sk_buff *);
 151
 152 int aoedev_init(void);
 153 void aoedev_exit(void);
 154 struct aoedev *aoedev_bymac(unsigned char *);
 155 void aoedev_downdev(struct aoedev *d);
 156 struct aoedev *aoedev_set(ulong, unsigned char *, struct net_device *, ulong);
 157 int aoedev_busy(void);
 158
 159 int aoenet_init(void);
 160 void aoenet_exit(void);
 161 void aoenet_xmit(struct sk_buff *);
 162 int is_aoe_netif(struct net_device *ifp);
 163 int set_aoe_iflist(const char __user *str, size_t size);
 164
 165 u64 mac_addr(char addr[6]);