drivers/block/aoe/aoe.h

   1 /* Copyright (c) 2006 Coraid, Inc.  See COPYING for GPL terms. */
   2 #define VERSION "22"
   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 res;
  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_PAUSE = (1<<5),
  80         DEVFL_NEWSIZE = (1<<6), /* need to update dev size in block layer */
  81
  82         BUFFL_FAIL = 1,
  83 };
  84
  85 enum {
  86         MAXATADATA = 1024,
  87         NPERSHELF = 16,         /* number of slots per shelf address */
  88         FREETAG = -1,
  89         MIN_BUFS = 8,
  90 };
  91
  92 struct buf {
  93         struct list_head bufs;
  94         ulong start_time;       /* for disk stats */
  95         ulong flags;
  96         ulong nframesout;
  97         char *bufaddr;
  98         ulong resid;
  99         ulong bv_resid;
 100         sector_t sector;
 101         struct bio *bio;
 102         struct bio_vec *bv;
 103 };
 104
 105 struct frame {
 106         int tag;
 107         ulong waited;
 108         struct buf *buf;
 109         char *bufaddr;
 110         int writedatalen;
 111         int ndata;
 112
 113         /* largest possible */
 114         unsigned char data[sizeof(struct aoe_hdr) + sizeof(struct aoe_atahdr)];
 115 };
 116
 117 struct aoedev {
 118         struct aoedev *next;
 119         unsigned char addr[6];  /* remote mac addr */
 120         ushort flags;
 121         ulong sysminor;
 122         ulong aoemajor;
 123         ulong aoeminor;
 124         ulong nopen;            /* (bd_openers isn't available without sleeping) */
 125         ulong rttavg;           /* round trip average of requests/responses */
 126         u16 fw_ver;             /* version of blade's firmware */
 127         struct work_struct work;/* disk create work struct */
 128         struct gendisk *gd;
 129         request_queue_t blkq;
 130         struct hd_geometry geo;
 131         sector_t ssize;
 132         struct timer_list timer;
 133         spinlock_t lock;
 134         struct net_device *ifp; /* interface ed is attached to */
 135         struct sk_buff *sendq_hd; /* packets needing to be sent, list head */
 136         struct sk_buff *sendq_tl;
 137         mempool_t *bufpool;     /* for deadlock-free Buf allocation */
 138         struct list_head bufq;  /* queue of bios to work on */
 139         struct buf *inprocess;  /* the one we're currently working on */
 140         ulong lasttag;          /* last tag sent */
 141         ulong nframes;          /* number of frames below */
 142         struct frame *frames;
 143 };
 144
 145
 146 int aoeblk_init(void);
 147 void aoeblk_exit(void);
 148 void aoeblk_gdalloc(void *);
 149 void aoedisk_rm_sysfs(struct aoedev *d);
 150
 151 int aoechr_init(void);
 152 void aoechr_exit(void);
 153 void aoechr_error(char *);
 154
 155 void aoecmd_work(struct aoedev *d);
 156 void aoecmd_cfg(ushort aoemajor, unsigned char aoeminor);
 157 void aoecmd_ata_rsp(struct sk_buff *);
 158 void aoecmd_cfg_rsp(struct sk_buff *);
 159 void aoecmd_sleepwork(void *vp);
 160
 161 int aoedev_init(void);
 162 void aoedev_exit(void);
 163 struct aoedev *aoedev_by_aoeaddr(int maj, int min);
 164 struct aoedev *aoedev_by_sysminor_m(ulong sysminor, ulong bufcnt);
 165 void aoedev_downdev(struct aoedev *d);
 166 int aoedev_isbusy(struct aoedev *d);
 167
 168 int aoenet_init(void);
 169 void aoenet_exit(void);
 170 void aoenet_xmit(struct sk_buff *);
 171 int is_aoe_netif(struct net_device *ifp);
 172 int set_aoe_iflist(const char __user *str, size_t size);
 173
 174 u64 mac_addr(char addr[6]);