drivers/block/aoe/aoe.h

   1 /* Copyright (c) 2013 Coraid, Inc.  See COPYING for GPL terms. */
   2 #define VERSION "81"
   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 WHITESPACE " \t\v\f\n,"
  14
  15 enum {
  16         AOECMD_ATA,
  17         AOECMD_CFG,
  18         AOECMD_VEND_MIN = 0xf0,
  19
  20         AOEFL_RSP = (1<<3),
  21         AOEFL_ERR = (1<<2),
  22
  23         AOEAFL_EXT = (1<<6),
  24         AOEAFL_DEV = (1<<4),
  25         AOEAFL_ASYNC = (1<<1),
  26         AOEAFL_WRITE = (1<<0),
  27
  28         AOECCMD_READ = 0,
  29         AOECCMD_TEST,
  30         AOECCMD_PTEST,
  31         AOECCMD_SET,
  32         AOECCMD_FSET,
  33
  34         AOE_HVER = 0x10,
  35 };
  36
  37 struct aoe_hdr {
  38         unsigned char dst[6];
  39         unsigned char src[6];
  40         __be16 type;
  41         unsigned char verfl;
  42         unsigned char err;
  43         __be16 major;
  44         unsigned char minor;
  45         unsigned char cmd;
  46         __be32 tag;
  47 };
  48
  49 struct aoe_atahdr {
  50         unsigned char aflags;
  51         unsigned char errfeat;
  52         unsigned char scnt;
  53         unsigned char cmdstat;
  54         unsigned char lba0;
  55         unsigned char lba1;
  56         unsigned char lba2;
  57         unsigned char lba3;
  58         unsigned char lba4;
  59         unsigned char lba5;
  60         unsigned char res[2];
  61 };
  62
  63 struct aoe_cfghdr {
  64         __be16 bufcnt;
  65         __be16 fwver;
  66         unsigned char scnt;
  67         unsigned char aoeccmd;
  68         unsigned char cslen[2];
  69 };
  70
  71 enum {
  72         DEVFL_UP = 1,   /* device is installed in system and ready for AoE->ATA commands */
  73         DEVFL_TKILL = (1<<1),   /* flag for timer to know when to kill self */
  74         DEVFL_EXT = (1<<2),     /* device accepts lba48 commands */
  75         DEVFL_GDALLOC = (1<<3), /* need to alloc gendisk */
  76         DEVFL_GD_NOW = (1<<4),  /* allocating gendisk */
  77         DEVFL_KICKME = (1<<5),  /* slow polling network card catch */
  78         DEVFL_NEWSIZE = (1<<6), /* need to update dev size in block layer */
  79         DEVFL_FREEING = (1<<7), /* set when device is being cleaned up */
  80         DEVFL_FREED = (1<<8),   /* device has been cleaned up */
  81 };
  82
  83 enum {
  84         DEFAULTBCNT = 2 * 512,  /* 2 sectors */
  85         MIN_BUFS = 16,
  86         NTARGETS = 4,
  87         NAOEIFS = 8,
  88         NSKBPOOLMAX = 256,
  89         NFACTIVE = 61,
  90
  91         TIMERTICK = HZ / 10,
  92         RTTSCALE = 8,
  93         RTTDSCALE = 3,
  94         RTTAVG_INIT = USEC_PER_SEC / 4 << RTTSCALE,
  95         RTTDEV_INIT = RTTAVG_INIT / 4,
  96
  97         HARD_SCORN_SECS = 10,   /* try another remote port after this */
  98         MAX_TAINT = 1000,       /* cap on aoetgt taint */
  99 };
 100
 101 struct buf {
 102         ulong nframesout;
 103         ulong resid;
 104         ulong bv_resid;
 105         sector_t sector;
 106         struct bio *bio;
 107         struct bio_vec *bv;
 108         struct request *rq;
 109 };
 110
 111 enum frame_flags {
 112         FFL_PROBE = 1,
 113 };
 114
 115 struct frame {
 116         struct list_head head;
 117         u32 tag;
 118         struct timeval sent;    /* high-res time packet was sent */
 119         u32 sent_jiffs;         /* low-res jiffies-based sent time */
 120         ulong waited;
 121         ulong waited_total;
 122         struct aoetgt *t;               /* parent target I belong to */
 123         sector_t lba;
 124         struct sk_buff *skb;            /* command skb freed on module exit */
 125         struct sk_buff *r_skb;          /* response skb for async processing */
 126         struct buf *buf;
 127         struct bio_vec *bv;
 128         ulong bcnt;
 129         ulong bv_off;
 130         char flags;
 131 };
 132
 133 struct aoeif {
 134         struct net_device *nd;
 135         ulong lost;
 136         int bcnt;
 137 };
 138
 139 struct aoetgt {
 140         unsigned char addr[6];
 141         ushort nframes;         /* cap on frames to use */
 142         struct aoedev *d;                       /* parent device I belong to */
 143         struct list_head ffree;                 /* list of free frames */
 144         struct aoeif ifs[NAOEIFS];
 145         struct aoeif *ifp;      /* current aoeif in use */
 146         ushort nout;            /* number of AoE commands outstanding */
 147         ushort maxout;          /* current value for max outstanding */
 148         ushort next_cwnd;       /* incr maxout after decrementing to zero */
 149         ushort ssthresh;        /* slow start threshold */
 150         ulong falloc;           /* number of allocated frames */
 151         int taint;              /* how much we want to avoid this aoetgt */
 152         int minbcnt;
 153         int wpkts, rpkts;
 154         char nout_probes;
 155 };
 156
 157 struct aoedev {
 158         struct aoedev *next;
 159         ulong sysminor;
 160         ulong aoemajor;
 161         u32 rttavg;             /* scaled AoE round trip time average */
 162         u32 rttdev;             /* scaled round trip time mean deviation */
 163         u16 aoeminor;
 164         u16 flags;
 165         u16 nopen;              /* (bd_openers isn't available without sleeping) */
 166         u16 fw_ver;             /* version of blade's firmware */
 167         u16 lasttag;            /* last tag sent */
 168         u16 useme;
 169         ulong ref;
 170         struct work_struct work;/* disk create work struct */
 171         struct gendisk *gd;
 172         struct request_queue *blkq;
 173         struct hd_geometry geo;
 174         sector_t ssize;
 175         struct timer_list timer;
 176         spinlock_t lock;
 177         struct sk_buff_head skbpool;
 178         mempool_t *bufpool;     /* for deadlock-free Buf allocation */
 179         struct {                /* pointers to work in progress */
 180                 struct buf *buf;
 181                 struct bio *nxbio;
 182                 struct request *rq;
 183         } ip;
 184         ulong maxbcnt;
 185         struct list_head factive[NFACTIVE];     /* hash of active frames */
 186         struct list_head rexmitq; /* deferred retransmissions */
 187         struct aoetgt **targets;
 188         ulong ntargets;         /* number of allocated aoetgt pointers */
 189         struct aoetgt **tgt;    /* target in use when working */
 190         ulong kicked;
 191         char ident[512];
 192 };
 193
 194 /* kthread tracking */
 195 struct ktstate {
 196         struct completion rendez;
 197         struct task_struct *task;
 198         wait_queue_head_t *waitq;
 199         int (*fn) (int);
 200         char name[12];
 201         spinlock_t *lock;
 202         int id;
 203         int active;
 204 };
 205
 206 int aoeblk_init(void);
 207 void aoeblk_exit(void);
 208 void aoeblk_gdalloc(void *);
 209 void aoedisk_rm_sysfs(struct aoedev *d);
 210
 211 int aoechr_init(void);
 212 void aoechr_exit(void);
 213 void aoechr_error(char *);
 214
 215 void aoecmd_work(struct aoedev *d);
 216 void aoecmd_cfg(ushort aoemajor, unsigned char aoeminor);
 217 struct sk_buff *aoecmd_ata_rsp(struct sk_buff *);
 218 void aoecmd_cfg_rsp(struct sk_buff *);
 219 void aoecmd_sleepwork(struct work_struct *);
 220 void aoecmd_wreset(struct aoetgt *t);
 221 void aoecmd_cleanslate(struct aoedev *);
 222 void aoecmd_exit(void);
 223 int aoecmd_init(void);
 224 struct sk_buff *aoecmd_ata_id(struct aoedev *);
 225 void aoe_freetframe(struct frame *);
 226 void aoe_flush_iocq(void);
 227 void aoe_flush_iocq_by_index(int);
 228 void aoe_end_request(struct aoedev *, struct request *, int);
 229 int aoe_ktstart(struct ktstate *k);
 230 void aoe_ktstop(struct ktstate *k);
 231
 232 int aoedev_init(void);
 233 void aoedev_exit(void);
 234 struct aoedev *aoedev_by_aoeaddr(ulong maj, int min, int do_alloc);
 235 void aoedev_downdev(struct aoedev *d);
 236 int aoedev_flush(const char __user *str, size_t size);
 237 void aoe_failbuf(struct aoedev *, struct buf *);
 238 void aoedev_put(struct aoedev *);
 239
 240 int aoenet_init(void);
 241 void aoenet_exit(void);
 242 void aoenet_xmit(struct sk_buff_head *);
 243 int is_aoe_netif(struct net_device *ifp);
 244 int set_aoe_iflist(const char __user *str, size_t size);