242 lines
6.0 KiB
C
242 lines
6.0 KiB
C
/* Copyright (c) 2012 Coraid, Inc. See COPYING for GPL terms. */
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#define VERSION "81"
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#define AOE_MAJOR 152
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#define DEVICE_NAME "aoe"
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/* set AOE_PARTITIONS to 1 to use whole-disks only
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* default is 16, which is 15 partitions plus the whole disk
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*/
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#ifndef AOE_PARTITIONS
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#define AOE_PARTITIONS (16)
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#endif
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#define WHITESPACE " \t\v\f\n,"
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enum {
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AOECMD_ATA,
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AOECMD_CFG,
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AOECMD_VEND_MIN = 0xf0,
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AOEFL_RSP = (1<<3),
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AOEFL_ERR = (1<<2),
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AOEAFL_EXT = (1<<6),
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AOEAFL_DEV = (1<<4),
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AOEAFL_ASYNC = (1<<1),
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AOEAFL_WRITE = (1<<0),
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AOECCMD_READ = 0,
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AOECCMD_TEST,
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AOECCMD_PTEST,
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AOECCMD_SET,
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AOECCMD_FSET,
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AOE_HVER = 0x10,
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};
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struct aoe_hdr {
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unsigned char dst[6];
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unsigned char src[6];
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__be16 type;
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unsigned char verfl;
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unsigned char err;
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__be16 major;
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unsigned char minor;
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unsigned char cmd;
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__be32 tag;
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};
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struct aoe_atahdr {
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unsigned char aflags;
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unsigned char errfeat;
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unsigned char scnt;
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unsigned char cmdstat;
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unsigned char lba0;
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unsigned char lba1;
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unsigned char lba2;
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unsigned char lba3;
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unsigned char lba4;
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unsigned char lba5;
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unsigned char res[2];
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};
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struct aoe_cfghdr {
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__be16 bufcnt;
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__be16 fwver;
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unsigned char scnt;
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unsigned char aoeccmd;
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unsigned char cslen[2];
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};
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enum {
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DEVFL_UP = 1, /* device is installed in system and ready for AoE->ATA commands */
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DEVFL_TKILL = (1<<1), /* flag for timer to know when to kill self */
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DEVFL_EXT = (1<<2), /* device accepts lba48 commands */
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DEVFL_GDALLOC = (1<<3), /* need to alloc gendisk */
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DEVFL_GD_NOW = (1<<4), /* allocating gendisk */
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DEVFL_KICKME = (1<<5), /* slow polling network card catch */
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DEVFL_NEWSIZE = (1<<6), /* need to update dev size in block layer */
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DEVFL_FREEING = (1<<7), /* set when device is being cleaned up */
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DEVFL_FREED = (1<<8), /* device has been cleaned up */
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};
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enum {
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DEFAULTBCNT = 2 * 512, /* 2 sectors */
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MIN_BUFS = 16,
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NTARGETS = 4,
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NAOEIFS = 8,
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NSKBPOOLMAX = 256,
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NFACTIVE = 61,
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TIMERTICK = HZ / 10,
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RTTSCALE = 8,
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RTTDSCALE = 3,
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RTTAVG_INIT = USEC_PER_SEC / 4 << RTTSCALE,
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RTTDEV_INIT = RTTAVG_INIT / 4,
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HARD_SCORN_SECS = 10, /* try another remote port after this */
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MAX_TAINT = 1000, /* cap on aoetgt taint */
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};
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struct buf {
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ulong nframesout;
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ulong resid;
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ulong bv_resid;
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sector_t sector;
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struct bio *bio;
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struct bio_vec *bv;
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struct request *rq;
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};
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enum frame_flags {
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FFL_PROBE = 1,
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};
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struct frame {
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struct list_head head;
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u32 tag;
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struct timeval sent; /* high-res time packet was sent */
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u32 sent_jiffs; /* low-res jiffies-based sent time */
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ulong waited;
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ulong waited_total;
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struct aoetgt *t; /* parent target I belong to */
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sector_t lba;
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struct sk_buff *skb; /* command skb freed on module exit */
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struct sk_buff *r_skb; /* response skb for async processing */
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struct buf *buf;
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struct bio_vec *bv;
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ulong bcnt;
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ulong bv_off;
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char flags;
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};
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struct aoeif {
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struct net_device *nd;
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ulong lost;
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int bcnt;
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};
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struct aoetgt {
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unsigned char addr[6];
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ushort nframes; /* cap on frames to use */
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struct aoedev *d; /* parent device I belong to */
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struct list_head ffree; /* list of free frames */
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struct aoeif ifs[NAOEIFS];
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struct aoeif *ifp; /* current aoeif in use */
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ushort nout; /* number of AoE commands outstanding */
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ushort maxout; /* current value for max outstanding */
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ushort next_cwnd; /* incr maxout after decrementing to zero */
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ushort ssthresh; /* slow start threshold */
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ulong falloc; /* number of allocated frames */
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int taint; /* how much we want to avoid this aoetgt */
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int minbcnt;
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int wpkts, rpkts;
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char nout_probes;
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};
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struct aoedev {
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struct aoedev *next;
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ulong sysminor;
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ulong aoemajor;
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u32 rttavg; /* scaled AoE round trip time average */
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u32 rttdev; /* scaled round trip time mean deviation */
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u16 aoeminor;
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u16 flags;
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u16 nopen; /* (bd_openers isn't available without sleeping) */
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u16 fw_ver; /* version of blade's firmware */
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u16 lasttag; /* last tag sent */
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u16 useme;
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ulong ref;
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struct work_struct work;/* disk create work struct */
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struct gendisk *gd;
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struct request_queue *blkq;
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struct hd_geometry geo;
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sector_t ssize;
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struct timer_list timer;
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spinlock_t lock;
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struct sk_buff_head skbpool;
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mempool_t *bufpool; /* for deadlock-free Buf allocation */
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struct { /* pointers to work in progress */
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struct buf *buf;
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struct bio *nxbio;
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struct request *rq;
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} ip;
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ulong maxbcnt;
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struct list_head factive[NFACTIVE]; /* hash of active frames */
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struct list_head rexmitq; /* deferred retransmissions */
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struct aoetgt **targets;
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ulong ntargets; /* number of allocated aoetgt pointers */
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struct aoetgt **tgt; /* target in use when working */
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ulong kicked;
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char ident[512];
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};
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/* kthread tracking */
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struct ktstate {
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struct completion rendez;
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struct task_struct *task;
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wait_queue_head_t *waitq;
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int (*fn) (void);
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char *name;
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spinlock_t *lock;
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};
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int aoeblk_init(void);
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void aoeblk_exit(void);
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void aoeblk_gdalloc(void *);
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void aoedisk_rm_sysfs(struct aoedev *d);
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int aoechr_init(void);
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void aoechr_exit(void);
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void aoechr_error(char *);
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void aoecmd_work(struct aoedev *d);
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void aoecmd_cfg(ushort aoemajor, unsigned char aoeminor);
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struct sk_buff *aoecmd_ata_rsp(struct sk_buff *);
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void aoecmd_cfg_rsp(struct sk_buff *);
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void aoecmd_sleepwork(struct work_struct *);
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void aoecmd_wreset(struct aoetgt *t);
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void aoecmd_cleanslate(struct aoedev *);
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void aoecmd_exit(void);
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int aoecmd_init(void);
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struct sk_buff *aoecmd_ata_id(struct aoedev *);
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void aoe_freetframe(struct frame *);
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void aoe_flush_iocq(void);
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void aoe_end_request(struct aoedev *, struct request *, int);
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int aoe_ktstart(struct ktstate *k);
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void aoe_ktstop(struct ktstate *k);
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int aoedev_init(void);
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void aoedev_exit(void);
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struct aoedev *aoedev_by_aoeaddr(ulong maj, int min, int do_alloc);
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void aoedev_downdev(struct aoedev *d);
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int aoedev_flush(const char __user *str, size_t size);
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void aoe_failbuf(struct aoedev *, struct buf *);
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void aoedev_put(struct aoedev *);
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int aoenet_init(void);
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void aoenet_exit(void);
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void aoenet_xmit(struct sk_buff_head *);
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int is_aoe_netif(struct net_device *ifp);
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int set_aoe_iflist(const char __user *str, size_t size);
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