aoecmd.c

来自「LINUX 2.6.17.4的源码」· C语言 代码 · 共 709 行 · 第 1/2 页

			d->rttavg = MAXTIMER;
	}

	d->timer.expires = jiffies + TIMERTICK;
	add_timer(&d->timer);

	spin_unlock_irqrestore(&d->lock, flags);

	aoenet_xmit(sl);
}

/* this function performs work that has been deferred until sleeping is OK
 */
void
aoecmd_sleepwork(void *vp)
{
	struct aoedev *d = (struct aoedev *) vp;

	if (d->flags & DEVFL_GDALLOC)
		aoeblk_gdalloc(d);

	if (d->flags & DEVFL_NEWSIZE) {
		struct block_device *bd;
		unsigned long flags;
		u64 ssize;

		ssize = d->gd->capacity;
		bd = bdget_disk(d->gd, 0);

		if (bd) {
			mutex_lock(&bd->bd_inode->i_mutex);
			i_size_write(bd->bd_inode, (loff_t)ssize<<9);
			mutex_unlock(&bd->bd_inode->i_mutex);
			bdput(bd);
		}
		spin_lock_irqsave(&d->lock, flags);
		d->flags |= DEVFL_UP;
		d->flags &= ~DEVFL_NEWSIZE;
		spin_unlock_irqrestore(&d->lock, flags);
	}
}

static void
ataid_complete(struct aoedev *d, unsigned char *id)
{
	u64 ssize;
	u16 n;

	/* word 83: command set supported */
	n = le16_to_cpu(get_unaligned((__le16 *) &id[83<<1]));

	/* word 86: command set/feature enabled */
	n |= le16_to_cpu(get_unaligned((__le16 *) &id[86<<1]));

	if (n & (1<<10)) {	/* bit 10: LBA 48 */
		d->flags |= DEVFL_EXT;

		/* word 100: number lba48 sectors */
		ssize = le64_to_cpu(get_unaligned((__le64 *) &id[100<<1]));

		/* set as in ide-disk.c:init_idedisk_capacity */
		d->geo.cylinders = ssize;
		d->geo.cylinders /= (255 * 63);
		d->geo.heads = 255;
		d->geo.sectors = 63;
	} else {
		d->flags &= ~DEVFL_EXT;

		/* number lba28 sectors */
		ssize = le32_to_cpu(get_unaligned((__le32 *) &id[60<<1]));

		/* NOTE: obsolete in ATA 6 */
		d->geo.cylinders = le16_to_cpu(get_unaligned((__le16 *) &id[54<<1]));
		d->geo.heads = le16_to_cpu(get_unaligned((__le16 *) &id[55<<1]));
		d->geo.sectors = le16_to_cpu(get_unaligned((__le16 *) &id[56<<1]));
	}

	if (d->ssize != ssize)
		printk(KERN_INFO "aoe: %012llx e%lu.%lu v%04x has %llu "
			"sectors\n", (unsigned long long)mac_addr(d->addr),
			d->aoemajor, d->aoeminor,
			d->fw_ver, (long long)ssize);
	d->ssize = ssize;
	d->geo.start = 0;
	if (d->gd != NULL) {
		d->gd->capacity = ssize;
		d->flags |= DEVFL_NEWSIZE;
	} else {
		if (d->flags & DEVFL_GDALLOC) {
			printk(KERN_INFO "aoe: %s: %s e%lu.%lu, %s\n",
			       __FUNCTION__,
			       "can't schedule work for",
			       d->aoemajor, d->aoeminor,
			       "it's already on! (This really shouldn't happen).\n");
			return;
		}
		d->flags |= DEVFL_GDALLOC;
	}
	schedule_work(&d->work);
}

static void
calc_rttavg(struct aoedev *d, int rtt)
{
	register long n;

	n = rtt;
	if (n < MINTIMER)
		n = MINTIMER;
	else if (n > MAXTIMER)
		n = MAXTIMER;

	/* g == .25; cf. Congestion Avoidance and Control, Jacobson & Karels; 1988 */
	n -= d->rttavg;
	d->rttavg += n >> 2;
}

void
aoecmd_ata_rsp(struct sk_buff *skb)
{
	struct aoedev *d;
	struct aoe_hdr *hin;
	struct aoe_atahdr *ahin, *ahout;
	struct frame *f;
	struct buf *buf;
	struct sk_buff *sl;
	register long n;
	ulong flags;
	char ebuf[128];
	u16 aoemajor;

	hin = (struct aoe_hdr *) skb->mac.raw;
	aoemajor = be16_to_cpu(hin->major);
	d = aoedev_by_aoeaddr(aoemajor, hin->minor);
	if (d == NULL) {
		snprintf(ebuf, sizeof ebuf, "aoecmd_ata_rsp: ata response "
			"for unknown device %d.%d\n",
			 aoemajor, hin->minor);
		aoechr_error(ebuf);
		return;
	}

	spin_lock_irqsave(&d->lock, flags);

	f = getframe(d, be32_to_cpu(hin->tag));
	if (f == NULL) {
		spin_unlock_irqrestore(&d->lock, flags);
		snprintf(ebuf, sizeof ebuf,
			"%15s e%d.%d    tag=%08x@%08lx\n",
			"unexpected rsp",
			be16_to_cpu(hin->major),
			hin->minor,
			be32_to_cpu(hin->tag),
			jiffies);
		aoechr_error(ebuf);
		return;
	}

	calc_rttavg(d, tsince(f->tag));

	ahin = (struct aoe_atahdr *) (hin+1);
	ahout = (struct aoe_atahdr *) (f->data + sizeof(struct aoe_hdr));
	buf = f->buf;

	if (ahout->cmdstat == WIN_IDENTIFY)
		d->flags &= ~DEVFL_PAUSE;
	if (ahin->cmdstat & 0xa9) {	/* these bits cleared on success */
		printk(KERN_CRIT "aoe: aoecmd_ata_rsp: ata error cmd=%2.2Xh "
			"stat=%2.2Xh from e%ld.%ld\n", 
			ahout->cmdstat, ahin->cmdstat,
			d->aoemajor, d->aoeminor);
		if (buf)
			buf->flags |= BUFFL_FAIL;
	} else {
		switch (ahout->cmdstat) {
		case WIN_READ:
		case WIN_READ_EXT:
			n = ahout->scnt << 9;
			if (skb->len - sizeof *hin - sizeof *ahin < n) {
				printk(KERN_CRIT "aoe: aoecmd_ata_rsp: runt "
					"ata data size in read.  skb->len=%d\n",
					skb->len);
				/* fail frame f?  just returning will rexmit. */
				spin_unlock_irqrestore(&d->lock, flags);
				return;
			}
			memcpy(f->bufaddr, ahin+1, n);
		case WIN_WRITE:
		case WIN_WRITE_EXT:
			break;
		case WIN_IDENTIFY:
			if (skb->len - sizeof *hin - sizeof *ahin < 512) {
				printk(KERN_INFO "aoe: aoecmd_ata_rsp: runt data size "
					"in ataid.  skb->len=%d\n", skb->len);
				spin_unlock_irqrestore(&d->lock, flags);
				return;
			}
			ataid_complete(d, (char *) (ahin+1));
			break;
		default:
			printk(KERN_INFO "aoe: aoecmd_ata_rsp: unrecognized "
			       "outbound ata command %2.2Xh for %d.%d\n", 
			       ahout->cmdstat,
			       be16_to_cpu(hin->major),
			       hin->minor);
		}
	}

	if (buf) {
		buf->nframesout -= 1;
		if (buf->nframesout == 0 && buf->resid == 0) {
			unsigned long duration = jiffies - buf->start_time;
			unsigned long n_sect = buf->bio->bi_size >> 9;
			struct gendisk *disk = d->gd;
			const int rw = bio_data_dir(buf->bio);

			disk_stat_inc(disk, ios[rw]);
			disk_stat_add(disk, ticks[rw], duration);
			disk_stat_add(disk, sectors[rw], n_sect);
			disk_stat_add(disk, io_ticks, duration);
			n = (buf->flags & BUFFL_FAIL) ? -EIO : 0;
			bio_endio(buf->bio, buf->bio->bi_size, n);
			mempool_free(buf, d->bufpool);
		}
	}

	f->buf = NULL;
	f->tag = FREETAG;

	aoecmd_work(d);
	sl = d->sendq_hd;
	d->sendq_hd = d->sendq_tl = NULL;

	spin_unlock_irqrestore(&d->lock, flags);
	aoenet_xmit(sl);
}

void
aoecmd_cfg(ushort aoemajor, unsigned char aoeminor)
{
	struct sk_buff *sl;

	sl = aoecmd_cfg_pkts(aoemajor, aoeminor, NULL);

	aoenet_xmit(sl);
}
 
/*
 * Since we only call this in one place (and it only prepares one frame)
 * we just return the skb.  Usually we'd chain it up to the aoedev sendq.
 */
static struct sk_buff *
aoecmd_ata_id(struct aoedev *d)
{
	struct aoe_hdr *h;
	struct aoe_atahdr *ah;
	struct frame *f;
	struct sk_buff *skb;

	f = getframe(d, FREETAG);
	if (f == NULL) {
		printk(KERN_CRIT "aoe: aoecmd_ata_id: can't get a frame.  "
			"This shouldn't happen.\n");
		return NULL;
	}

	/* initialize the headers & frame */
	h = (struct aoe_hdr *) f->data;
	ah = (struct aoe_atahdr *) (h+1);
	f->ndata = sizeof *h + sizeof *ah;
	memset(h, 0, f->ndata);
	f->tag = aoehdr_atainit(d, h);
	f->waited = 0;
	f->writedatalen = 0;

	/* set up ata header */
	ah->scnt = 1;
	ah->cmdstat = WIN_IDENTIFY;
	ah->lba3 = 0xa0;

	skb = skb_prepare(d, f);

	d->rttavg = MAXTIMER;
	d->timer.function = rexmit_timer;

	return skb;
}
 
void
aoecmd_cfg_rsp(struct sk_buff *skb)
{
	struct aoedev *d;
	struct aoe_hdr *h;
	struct aoe_cfghdr *ch;
	ulong flags, sysminor, aoemajor;
	u16 bufcnt;
	struct sk_buff *sl;
	enum { MAXFRAMES = 16 };

	h = (struct aoe_hdr *) skb->mac.raw;
	ch = (struct aoe_cfghdr *) (h+1);

	/*
	 * Enough people have their dip switches set backwards to
	 * warrant a loud message for this special case.
	 */
	aoemajor = be16_to_cpu(h->major);
	if (aoemajor == 0xfff) {
		printk(KERN_CRIT "aoe: aoecmd_cfg_rsp: Warning: shelf "
			"address is all ones.  Check shelf dip switches\n");
		return;
	}

	sysminor = SYSMINOR(aoemajor, h->minor);
	if (sysminor * AOE_PARTITIONS + AOE_PARTITIONS > MINORMASK) {
		printk(KERN_INFO
			"aoe: e%ld.%d: minor number too large\n", 
			aoemajor, (int) h->minor);
		return;
	}

	bufcnt = be16_to_cpu(ch->bufcnt);
	if (bufcnt > MAXFRAMES)	/* keep it reasonable */
		bufcnt = MAXFRAMES;

	d = aoedev_by_sysminor_m(sysminor, bufcnt);
	if (d == NULL) {
		printk(KERN_INFO "aoe: aoecmd_cfg_rsp: device sysminor_m failure\n");
		return;
	}

	spin_lock_irqsave(&d->lock, flags);

	/* permit device to migrate mac and network interface */
	d->ifp = skb->dev;
	memcpy(d->addr, h->src, sizeof d->addr);

	/* don't change users' perspective */
	if (d->nopen && !(d->flags & DEVFL_PAUSE)) {
		spin_unlock_irqrestore(&d->lock, flags);
		return;
	}
	d->flags |= DEVFL_PAUSE;	/* force pause */
	d->fw_ver = be16_to_cpu(ch->fwver);

	/* check for already outstanding ataid */
	sl = aoedev_isbusy(d) == 0 ? aoecmd_ata_id(d) : NULL;

	spin_unlock_irqrestore(&d->lock, flags);

	aoenet_xmit(sl);
}