1 files changed, 629 insertions, 0 deletions

diff --git a/drivers/block/aoe/aoecmd.c b/drivers/block/aoe/aoecmd.c
new file mode 100644
index 000000000000..fb6d942a4565
--- /dev/null
+++ b/drivers/block/aoe/aoecmd.c
@@ -0,0 +1,629 @@
+/* Copyright (c) 2004 Coraid, Inc.  See COPYING for GPL terms. */
+/*
+ * aoecmd.c
+ * Filesystem request handling methods
+ */
+
+#include <linux/hdreg.h>
+#include <linux/blkdev.h>
+#include <linux/skbuff.h>
+#include <linux/netdevice.h>
+#include "aoe.h"
+
+#define TIMERTICK (HZ / 10)
+#define MINTIMER (2 * TIMERTICK)
+#define MAXTIMER (HZ << 1)
+#define MAXWAIT (60 * 3)        /* After MAXWAIT seconds, give up and fail dev */
+
+static struct sk_buff *
+new_skb(struct net_device *if_dev, ulong len)
+{
+        struct sk_buff *skb;
+
+        skb = alloc_skb(len, GFP_ATOMIC);
+        if (skb) {
+                skb->nh.raw = skb->mac.raw = skb->data;
+                skb->dev = if_dev;
+                skb->protocol = __constant_htons(ETH_P_AOE);
+                skb->priority = 0;
+                skb_put(skb, len);
+                skb->next = skb->prev = NULL;
+
+                /* tell the network layer not to perform IP checksums
+                 * or to get the NIC to do it
+                 */
+                skb->ip_summed = CHECKSUM_NONE;
+        }
+        return skb;
+}
+
+static struct sk_buff *
+skb_prepare(struct aoedev *d, struct frame *f)
+{
+        struct sk_buff *skb;
+        char *p;
+
+        skb = new_skb(d->ifp, f->ndata + f->writedatalen);
+        if (!skb) {
+                printk(KERN_INFO "aoe: skb_prepare: failure to allocate skb\n");
+                return NULL;
+        }
+
+        p = skb->mac.raw;
+        memcpy(p, f->data, f->ndata);
+
+        if (f->writedatalen) {
+                p += sizeof(struct aoe_hdr) + sizeof(struct aoe_atahdr);
+                memcpy(p, f->bufaddr, f->writedatalen);
+        }
+
+        return skb;
+}
+
+static struct frame *
+getframe(struct aoedev *d, int tag)
+{
+        struct frame *f, *e;
+
+        f = d->frames;
+        e = f + d->nframes;
+        for (; f<e; f++)
+                if (f->tag == tag)
+                        return f;
+        return NULL;
+}
+
+/*
+ * Leave the top bit clear so we have tagspace for userland.
+ * The bottom 16 bits are the xmit tick for rexmit/rttavg processing.
+ * This driver reserves tag -1 to mean "unused frame."
+ */
+static int
+newtag(struct aoedev *d)
+{
+        register ulong n;
+
+        n = jiffies & 0xffff;
+        return n |= (++d->lasttag & 0x7fff) << 16;
+}
+
+static int
+aoehdr_atainit(struct aoedev *d, struct aoe_hdr *h)
+{
+        u16 type = __constant_cpu_to_be16(ETH_P_AOE);
+        u16 aoemajor = __cpu_to_be16(d->aoemajor);
+        u32 host_tag = newtag(d);
+        u32 tag = __cpu_to_be32(host_tag);
+
+        memcpy(h->src, d->ifp->dev_addr, sizeof h->src);
+        memcpy(h->dst, d->addr, sizeof h->dst);
+        memcpy(h->type, &type, sizeof type);
+        h->verfl = AOE_HVER;
+        memcpy(h->major, &aoemajor, sizeof aoemajor);
+        h->minor = d->aoeminor;
+        h->cmd = AOECMD_ATA;
+        memcpy(h->tag, &tag, sizeof tag);
+
+        return host_tag;
+}
+
+static void
+aoecmd_ata_rw(struct aoedev *d, struct frame *f)
+{
+        struct aoe_hdr *h;
+        struct aoe_atahdr *ah;
+        struct buf *buf;
+        struct sk_buff *skb;
+        ulong bcnt;
+        register sector_t sector;
+        char writebit, extbit;
+
+        writebit = 0x10;
+        extbit = 0x4;
+
+        buf = d->inprocess;
+
+        sector = buf->sector;
+        bcnt = buf->bv_resid;
+        if (bcnt > MAXATADATA)
+                bcnt = MAXATADATA;
+
+        /* 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->buf = buf;
+        f->bufaddr = buf->bufaddr;
+
+        /* set up ata header */
+        ah->scnt = bcnt >> 9;
+        ah->lba0 = sector;
+        ah->lba1 = sector >>= 8;
+        ah->lba2 = sector >>= 8;
+        ah->lba3 = sector >>= 8;
+        if (d->flags & DEVFL_EXT) {
+                ah->aflags |= AOEAFL_EXT;
+                ah->lba4 = sector >>= 8;
+                ah->lba5 = sector >>= 8;
+        } else {
+                extbit = 0;
+                ah->lba3 &= 0x0f;
+                ah->lba3 |= 0xe0;       /* LBA bit + obsolete 0xa0 */
+        }
+
+        if (bio_data_dir(buf->bio) == WRITE) {
+                ah->aflags |= AOEAFL_WRITE;
+                f->writedatalen = bcnt;
+        } else {
+                writebit = 0;
+                f->writedatalen = 0;
+        }
+
+        ah->cmdstat = WIN_READ | writebit | extbit;
+
+        /* mark all tracking fields and load out */
+        buf->nframesout += 1;
+        buf->bufaddr += bcnt;
+        buf->bv_resid -= bcnt;
+/* printk(KERN_INFO "aoe: bv_resid=%ld\n", buf->bv_resid); */
+        buf->resid -= bcnt;
+        buf->sector += bcnt >> 9;
+        if (buf->resid == 0) {
+                d->inprocess = NULL;
+        } else if (buf->bv_resid == 0) {
+                buf->bv++;
+                buf->bv_resid = buf->bv->bv_len;
+                buf->bufaddr = page_address(buf->bv->bv_page) + buf->bv->bv_offset;
+        }
+
+        skb = skb_prepare(d, f);
+        if (skb) {
+                skb->next = d->skblist;
+                d->skblist = skb;
+        }
+}
+
+/* enters with d->lock held */
+void
+aoecmd_work(struct aoedev *d)
+{
+        struct frame *f;
+        struct buf *buf;
+loop:
+        f = getframe(d, FREETAG);
+        if (f == NULL)
+                return;
+        if (d->inprocess == NULL) {
+                if (list_empty(&d->bufq))
+                        return;
+                buf = container_of(d->bufq.next, struct buf, bufs);
+                list_del(d->bufq.next);
+/*printk(KERN_INFO "aoecmd_work: bi_size=%ld\n", buf->bio->bi_size); */
+                d->inprocess = buf;
+        }
+        aoecmd_ata_rw(d, f);
+        goto loop;
+}
+
+static void
+rexmit(struct aoedev *d, struct frame *f)
+{
+        struct sk_buff *skb;
+        struct aoe_hdr *h;
+        char buf[128];
+        u32 n;
+        u32 net_tag;
+
+        n = newtag(d);
+
+        snprintf(buf, sizeof buf,
+                "%15s e%ld.%ld oldtag=%08x@%08lx newtag=%08x\n",
+                "retransmit",
+                d->aoemajor, d->aoeminor, f->tag, jiffies, n);
+        aoechr_error(buf);
+
+        h = (struct aoe_hdr *) f->data;
+        f->tag = n;
+        net_tag = __cpu_to_be32(n);
+        memcpy(h->tag, &net_tag, sizeof net_tag);
+
+        skb = skb_prepare(d, f);
+        if (skb) {
+                skb->next = d->skblist;
+                d->skblist = skb;
+        }
+}
+
+static int
+tsince(int tag)
+{
+        int n;
+
+        n = jiffies & 0xffff;
+        n -= tag & 0xffff;
+        if (n < 0)
+                n += 1<<16;
+        return n;
+}
+
+static void
+rexmit_timer(ulong vp)
+{
+        struct aoedev *d;
+        struct frame *f, *e;
+        struct sk_buff *sl;
+        register long timeout;
+        ulong flags, n;
+
+        d = (struct aoedev *) vp;
+        sl = NULL;
+
+        /* timeout is always ~150% of the moving average */
+        timeout = d->rttavg;
+        timeout += timeout >> 1;
+
+        spin_lock_irqsave(&d->lock, flags);
+
+        if (d->flags & DEVFL_TKILL) {
+tdie:           spin_unlock_irqrestore(&d->lock, flags);
+                return;
+        }
+        f = d->frames;
+        e = f + d->nframes;
+        for (; f<e; f++) {
+                if (f->tag != FREETAG && tsince(f->tag) >= timeout) {
+                        n = f->waited += timeout;
+                        n /= HZ;
+                        if (n > MAXWAIT) { /* waited too long.  device failure. */
+                                aoedev_downdev(d);
+                                goto tdie;
+                        }
+                        rexmit(d, f);
+                }
+        }
+
+        sl = d->skblist;
+        d->skblist = NULL;
+        if (sl) {
+                n = d->rttavg <<= 1;
+                if (n > MAXTIMER)
+                        d->rttavg = MAXTIMER;
+        }
+
+        d->timer.expires = jiffies + TIMERTICK;
+        add_timer(&d->timer);
+
+        spin_unlock_irqrestore(&d->lock, flags);
+
+        aoenet_xmit(sl);
+}
+
+static void
+ataid_complete(struct aoedev *d, unsigned char *id)
+{
+        u64 ssize;
+        u16 n;
+
+        /* word 83: command set supported */
+        n = __le16_to_cpu(*((u16 *) &id[83<<1]));
+
+        /* word 86: command set/feature enabled */
+        n |= __le16_to_cpu(*((u16 *) &id[86<<1]));
+
+        if (n & (1<<10)) {      /* bit 10: LBA 48 */
+                d->flags |= DEVFL_EXT;
+
+                /* word 100: number lba48 sectors */
+                ssize = __le64_to_cpu(*((u64 *) &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(*((u32 *) &id[60<<1]));
+
+                /* NOTE: obsolete in ATA 6 */
+                d->geo.cylinders = __le16_to_cpu(*((u16 *) &id[54<<1]));
+                d->geo.heads = __le16_to_cpu(*((u16 *) &id[55<<1]));
+                d->geo.sectors = __le16_to_cpu(*((u16 *) &id[56<<1]));
+        }
+        d->ssize = ssize;
+        d->geo.start = 0;
+        if (d->gd != NULL) {
+                d->gd->capacity = ssize;
+                d->flags |= DEVFL_UP;
+                return;
+        }
+        if (d->flags & DEVFL_WORKON) {
+                printk(KERN_INFO "aoe: ataid_complete: can't schedule work, it's already on!  "
+                        "(This really shouldn't happen).\n");
+                return;
+        }
+        INIT_WORK(&d->work, aoeblk_gdalloc, d);
+        schedule_work(&d->work);
+        d->flags |= DEVFL_WORKON;
+}
+
+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];
+        
+        hin = (struct aoe_hdr *) skb->mac.raw;
+        d = aoedev_bymac(hin->src);
+        if (d == NULL) {
+                snprintf(ebuf, sizeof ebuf, "aoecmd_ata_rsp: ata response "
+                        "for unknown device %d.%d\n",
+                         __be16_to_cpu(*((u16 *) hin->major)),
+                        hin->minor);
+                aoechr_error(ebuf);
+                return;
+        }
+
+        spin_lock_irqsave(&d->lock, flags);
+
+        f = getframe(d, __be32_to_cpu(*((u32 *) 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(*((u16 *) hin->major)),
+                        hin->minor,
+                        __be32_to_cpu(*((u32 *) 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 (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));
+                        /* d->flags |= DEVFL_WC_UPDATE; */
+                        break;
+                default:
+                        printk(KERN_INFO "aoe: aoecmd_ata_rsp: unrecognized "
+                               "outbound ata command %2.2Xh for %d.%d\n", 
+                               ahout->cmdstat,
+                               __be16_to_cpu(*((u16 *) hin->major)),
+                               hin->minor);
+                }
+        }
+
+        if (buf) {
+                buf->nframesout -= 1;
+                if (buf->nframesout == 0 && buf->resid == 0) {
+                        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->skblist;
+        d->skblist = NULL;
+
+        spin_unlock_irqrestore(&d->lock, flags);
+
+        aoenet_xmit(sl);
+}
+
+void
+aoecmd_cfg(ushort aoemajor, unsigned char aoeminor)
+{
+        struct aoe_hdr *h;
+        struct aoe_cfghdr *ch;
+        struct sk_buff *skb, *sl;
+        struct net_device *ifp;
+        u16 aoe_type = __constant_cpu_to_be16(ETH_P_AOE);
+        u16 net_aoemajor = __cpu_to_be16(aoemajor);
+
+        sl = NULL;
+
+        read_lock(&dev_base_lock);
+        for (ifp = dev_base; ifp; dev_put(ifp), ifp = ifp->next) {
+                dev_hold(ifp);
+                if (!is_aoe_netif(ifp))
+                        continue;
+
+                skb = new_skb(ifp, sizeof *h + sizeof *ch);
+                if (skb == NULL) {
+                        printk(KERN_INFO "aoe: aoecmd_cfg: skb alloc failure\n");
+                        continue;
+                }
+                h = (struct aoe_hdr *) skb->mac.raw;
+                memset(h, 0, sizeof *h + sizeof *ch);
+
+                memset(h->dst, 0xff, sizeof h->dst);
+                memcpy(h->src, ifp->dev_addr, sizeof h->src);
+                memcpy(h->type, &aoe_type, sizeof aoe_type);
+                h->verfl = AOE_HVER;
+                memcpy(h->major, &net_aoemajor, sizeof net_aoemajor);
+                h->minor = aoeminor;
+                h->cmd = AOECMD_CFG;
+
+                skb->next = sl;
+                sl = skb;
+        }
+        read_unlock(&dev_base_lock);
+
+        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 d->skblist.
+ */
+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;
+
+        /* this message initializes the device, so we reset the rttavg */
+        d->rttavg = MAXTIMER;
+
+        /* set up ata header */
+        ah->scnt = 1;
+        ah->cmdstat = WIN_IDENTIFY;
+        ah->lba3 = 0xa0;
+
+        skb = skb_prepare(d, f);
+
+        /* we now want to start the rexmit tracking */
+        d->flags &= ~DEVFL_TKILL;
+        d->timer.data = (ulong) d;
+        d->timer.function = rexmit_timer;
+        d->timer.expires = jiffies + TIMERTICK;
+        add_timer(&d->timer);
+
+        return skb;
+}
+ 
+void
+aoecmd_cfg_rsp(struct sk_buff *skb)
+{
+        struct aoedev *d;
+        struct aoe_hdr *h;
+        struct aoe_cfghdr *ch;
+        ulong flags, bufcnt, sysminor, aoemajor;
+        struct sk_buff *sl;
+        enum { MAXFRAMES = 8, MAXSYSMINOR = 255 };
+
+        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(*((u16 *) 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 > MAXSYSMINOR) {
+                printk(KERN_INFO "aoe: aoecmd_cfg_rsp: sysminor %ld too "
+                        "large\n", sysminor);
+                return;
+        }
+
+        bufcnt = __be16_to_cpu(*((u16 *) ch->bufcnt));
+        if (bufcnt > MAXFRAMES) /* keep it reasonable */
+                bufcnt = MAXFRAMES;
+
+        d = aoedev_set(sysminor, h->src, skb->dev, bufcnt);
+        if (d == NULL) {
+                printk(KERN_INFO "aoe: aoecmd_cfg_rsp: device set failure\n");
+                return;
+        }
+
+        spin_lock_irqsave(&d->lock, flags);
+
+        if (d->flags & (DEVFL_UP | DEVFL_CLOSEWAIT)) {
+                spin_unlock_irqrestore(&d->lock, flags);
+                return;
+        }
+
+        d->fw_ver = __be16_to_cpu(*((u16 *) ch->fwver));
+
+        /* we get here only if the device is new */
+        sl = aoecmd_ata_id(d);
+
+        spin_unlock_irqrestore(&d->lock, flags);
+
+        aoenet_xmit(sl);
+}
+