LXR linux/drivers/block/aoe/aoe.h

   1/* Copyright (c) 2013 Coraid, Inc.  See COPYING for GPL terms. */
   2#include <linux/blk-mq.h>
   3
   4#define VERSION "85"
   5#define AOE_MAJOR 152
   6#define DEVICE_NAME "aoe"
   7
   8/* set AOE_PARTITIONS to 1 to use whole-disks only
   9 * default is 16, which is 15 partitions plus the whole disk
  10 */
  11#ifndef AOE_PARTITIONS
  12#define AOE_PARTITIONS (16)
  13#endif
  14
  15#define WHITESPACE " \t\v\f\n,"
  16
  17enum {
  18        AOECMD_ATA,
  19        AOECMD_CFG,
  20        AOECMD_VEND_MIN = 0xf0,
  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
  39struct 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
  51struct 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
  65struct aoe_cfghdr {
  66        __be16 bufcnt;
  67        __be16 fwver;
  68        unsigned char scnt;
  69        unsigned char aoeccmd;
  70        unsigned char cslen[2];
  71};
  72
  73enum {
  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_GDALLOC = (1<<3), /* need to alloc gendisk */
  78        DEVFL_GD_NOW = (1<<4),  /* allocating gendisk */
  79        DEVFL_KICKME = (1<<5),  /* slow polling network card catch */
  80        DEVFL_NEWSIZE = (1<<6), /* need to update dev size in block layer */
  81        DEVFL_FREEING = (1<<7), /* set when device is being cleaned up */
  82        DEVFL_FREED = (1<<8),   /* device has been cleaned up */
  83};
  84
  85enum {
  86        DEFAULTBCNT = 2 * 512,  /* 2 sectors */
  87        MIN_BUFS = 16,
  88        NTARGETS = 4,
  89        NAOEIFS = 8,
  90        NSKBPOOLMAX = 256,
  91        NFACTIVE = 61,
  92
  93        TIMERTICK = HZ / 10,
  94        RTTSCALE = 8,
  95        RTTDSCALE = 3,
  96        RTTAVG_INIT = USEC_PER_SEC / 4 << RTTSCALE,
  97        RTTDEV_INIT = RTTAVG_INIT / 4,
  98
  99        HARD_SCORN_SECS = 10,   /* try another remote port after this */
 100        MAX_TAINT = 1000,       /* cap on aoetgt taint */
 101};
 102
 103struct aoe_req {
 104        unsigned long nr_bios;
 105};
 106
 107struct buf {
 108        ulong nframesout;
 109        struct bio *bio;
 110        struct bvec_iter iter;
 111        struct request *rq;
 112};
 113
 114enum frame_flags {
 115        FFL_PROBE = 1,
 116};
 117
 118struct frame {
 119        struct list_head head;
 120        u32 tag;
 121        ktime_t sent;                   /* high-res time packet was sent */
 122        ulong waited;
 123        ulong waited_total;
 124        struct aoetgt *t;               /* parent target I belong to */
 125        struct sk_buff *skb;            /* command skb freed on module exit */
 126        struct sk_buff *r_skb;          /* response skb for async processing */
 127        struct buf *buf;
 128        struct bvec_iter iter;
 129        char flags;
 130};
 131
 132struct aoeif {
 133        struct net_device *nd;
 134        ulong lost;
 135        int bcnt;
 136};
 137
 138struct aoetgt {
 139        unsigned char addr[6];
 140        ushort nframes;         /* cap on frames to use */
 141        struct aoedev *d;                       /* parent device I belong to */
 142        struct list_head ffree;                 /* list of free frames */
 143        struct aoeif ifs[NAOEIFS];
 144        struct aoeif *ifp;      /* current aoeif in use */
 145        ushort nout;            /* number of AoE commands outstanding */
 146        ushort maxout;          /* current value for max outstanding */
 147        ushort next_cwnd;       /* incr maxout after decrementing to zero */
 148        ushort ssthresh;        /* slow start threshold */
 149        ulong falloc;           /* number of allocated frames */
 150        int taint;              /* how much we want to avoid this aoetgt */
 151        int minbcnt;
 152        int wpkts, rpkts;
 153        char nout_probes;
 154};
 155
 156struct aoedev {
 157        struct aoedev *next;
 158        ulong sysminor;
 159        ulong aoemajor;
 160        u32 rttavg;             /* scaled AoE round trip time average */
 161        u32 rttdev;             /* scaled round trip time mean deviation */
 162        u16 aoeminor;
 163        u16 flags;
 164        u16 nopen;              /* (bd_openers isn't available without sleeping) */
 165        u16 fw_ver;             /* version of blade's firmware */
 166        u16 lasttag;            /* last tag sent */
 167        u16 useme;
 168        ulong ref;
 169        struct work_struct work;/* disk create work struct */
 170        struct gendisk *gd;
 171        struct dentry *debugfs;
 172        struct request_queue *blkq;
 173        struct list_head rq_list;
 174        struct blk_mq_tag_set tag_set;
 175        struct hd_geometry geo;
 176        sector_t ssize;
 177        struct timer_list timer;
 178        spinlock_t lock;
 179        struct sk_buff_head skbpool;
 180        mempool_t *bufpool;     /* for deadlock-free Buf allocation */
 181        struct {                /* pointers to work in progress */
 182                struct buf *buf;
 183                struct bio *nxbio;
 184                struct request *rq;
 185        } ip;
 186        ulong maxbcnt;
 187        struct list_head factive[NFACTIVE];     /* hash of active frames */
 188        struct list_head rexmitq; /* deferred retransmissions */
 189        struct aoetgt **targets;
 190        ulong ntargets;         /* number of allocated aoetgt pointers */
 191        struct aoetgt **tgt;    /* target in use when working */
 192        ulong kicked;
 193        char ident[512];
 194};
 195
 196/* kthread tracking */
 197struct ktstate {
 198        struct completion rendez;
 199        struct task_struct *task;
 200        wait_queue_head_t *waitq;
 201        int (*fn) (int);
 202        char name[12];
 203        spinlock_t *lock;
 204        int id;
 205        int active;
 206};
 207
 208int aoeblk_init(void);
 209void aoeblk_exit(void);
 210void aoeblk_gdalloc(void *);
 211void aoedisk_rm_debugfs(struct aoedev *d);
 212
 213int aoechr_init(void);
 214void aoechr_exit(void);
 215void aoechr_error(char *);
 216
 217void aoecmd_work(struct aoedev *d);
 218void aoecmd_cfg(ushort aoemajor, unsigned char aoeminor);
 219struct sk_buff *aoecmd_ata_rsp(struct sk_buff *);
 220void aoecmd_cfg_rsp(struct sk_buff *);
 221void aoecmd_sleepwork(struct work_struct *);
 222void aoecmd_wreset(struct aoetgt *t);
 223void aoecmd_cleanslate(struct aoedev *);
 224void aoecmd_exit(void);
 225int aoecmd_init(void);
 226struct sk_buff *aoecmd_ata_id(struct aoedev *);
 227void aoe_freetframe(struct frame *);
 228void aoe_flush_iocq(void);
 229void aoe_flush_iocq_by_index(int);
 230void aoe_end_request(struct aoedev *, struct request *, int);
 231int aoe_ktstart(struct ktstate *k);
 232void aoe_ktstop(struct ktstate *k);
 233
 234int aoedev_init(void);
 235void aoedev_exit(void);
 236struct aoedev *aoedev_by_aoeaddr(ulong maj, int min, int do_alloc);
 237void aoedev_downdev(struct aoedev *d);
 238int aoedev_flush(const char __user *str, size_t size);
 239void aoe_failbuf(struct aoedev *, struct buf *);
 240void aoedev_put(struct aoedev *);
 241
 242int aoenet_init(void);
 243void aoenet_exit(void);
 244void aoenet_xmit(struct sk_buff_head *);
 245int is_aoe_netif(struct net_device *ifp);
 246int set_aoe_iflist(const char __user *str, size_t size);
 247