drivers/block/aoe/aoe.h

   1 /* Copyright (c) 2004 Coraid, Inc.  See COPYING for GPL terms. */
   2 #define VERSION "14"
   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_WC_UPDATE = (1<<4), /* this device needs to update write cache status */
  79         DEVFL_WORKON = (1<<4),
  80
  81         BUFFL_FAIL = 1,
  82 };
  83
  84 enum {
  85         MAXATADATA = 1024,
  86         NPERSHELF = 16,         /* number of slots per shelf address */
  87         FREETAG = -1,
  88         MIN_BUFS = 8,
  89 };
  90
  91 struct buf {
  92         struct list_head bufs;
  93         ulong start_time;       /* for disk stats */
  94         ulong flags;
  95         ulong nframesout;
  96         char *bufaddr;
  97         ulong resid;
  98         ulong bv_resid;
  99         sector_t sector;
 100         struct bio *bio;
 101         struct bio_vec *bv;
 102 };
 103
 104 struct frame {
 105         int tag;
 106         ulong waited;
 107         struct buf *buf;
 108         char *bufaddr;
 109         int writedatalen;
 110         int ndata;
 111
 112         /* largest possible */
 113         unsigned char data[sizeof(struct aoe_hdr) + sizeof(struct aoe_atahdr)];
 114 };
 115
 116 struct aoedev {
 117         struct aoedev *next;
 118         unsigned char addr[6];  /* remote mac addr */
 119         ushort flags;
 120         ulong sysminor;
 121         ulong aoemajor;
 122         ulong aoeminor;
 123         ulong nopen;            /* (bd_openers isn't available without sleeping) */
 124         ulong rttavg;           /* round trip average of requests/responses */
 125         u16 fw_ver;             /* version of blade's firmware */
 126         struct work_struct work;/* disk create work struct */
 127         struct gendisk *gd;
 128         request_queue_t blkq;
 129         struct hd_geometry geo;
 130         sector_t ssize;
 131         struct timer_list timer;
 132         spinlock_t lock;
 133         struct net_device *ifp; /* interface ed is attached to */
 134         struct sk_buff *sendq_hd; /* packets needing to be sent, list head */
 135         struct sk_buff *sendq_tl;
 136         mempool_t *bufpool;     /* for deadlock-free Buf allocation */
 137         struct list_head bufq;  /* queue of bios to work on */
 138         struct buf *inprocess;  /* the one we're currently working on */
 139         ulong lasttag;          /* last tag sent */
 140         ulong nframes;          /* number of frames below */
 141         struct frame *frames;
 142 };
 143
 144
 145 int aoeblk_init(void);
 146 void aoeblk_exit(void);
 147 void aoeblk_gdalloc(void *);
 148 void aoedisk_rm_sysfs(struct aoedev *d);
 149
 150 int aoechr_init(void);
 151 void aoechr_exit(void);
 152 void aoechr_error(char *);
 153
 154 void aoecmd_work(struct aoedev *d);
 155 void aoecmd_cfg(ushort, unsigned char);
 156 void aoecmd_ata_rsp(struct sk_buff *);
 157 void aoecmd_cfg_rsp(struct sk_buff *);
 158
 159 int aoedev_init(void);
 160 void aoedev_exit(void);
 161 struct aoedev *aoedev_by_aoeaddr(int maj, int min);
 162 void aoedev_downdev(struct aoedev *d);
 163 struct aoedev *aoedev_set(ulong, unsigned char *, struct net_device *, ulong);
 164 int aoedev_busy(void);
 165
 166 int aoenet_init(void);
 167 void aoenet_exit(void);
 168 void aoenet_xmit(struct sk_buff *);
 169 int is_aoe_netif(struct net_device *ifp);
 170 int set_aoe_iflist(const char __user *str, size_t size);
 171
 172 u64 mac_addr(char addr[6]);