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OpenCloudOS-Kernel/drivers/block/aoe/aoecmd.c

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/* Copyright (c) 2007 Coraid, Inc. See COPYING for GPL terms. */
/*
* aoecmd.c
* Filesystem request handling methods
*/
#include <linux/ata.h>
#include <linux/hdreg.h>
#include <linux/blkdev.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/genhd.h>
#include <linux/moduleparam.h>
#include <net/net_namespace.h>
#include <asm/unaligned.h>
#include "aoe.h"
static int aoe_deadsecs = 60 * 3;
module_param(aoe_deadsecs, int, 0644);
MODULE_PARM_DESC(aoe_deadsecs, "After aoe_deadsecs seconds, give up and fail dev.");
static int aoe_maxout = 16;
module_param(aoe_maxout, int, 0644);
MODULE_PARM_DESC(aoe_maxout,
"Only aoe_maxout outstanding packets for every MAC on eX.Y.");
static struct sk_buff *
new_skb(ulong len)
{
struct sk_buff *skb;
skb = alloc_skb(len, GFP_ATOMIC);
if (skb) {
skb_reset_mac_header(skb);
skb_reset_network_header(skb);
skb->protocol = __constant_htons(ETH_P_AOE);
}
return skb;
}
static struct frame *
getframe(struct aoetgt *t, int tag)
{
struct frame *f, *e;
f = t->frames;
e = f + t->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 aoetgt *t)
{
register ulong n;
n = jiffies & 0xffff;
return n |= (++t->lasttag & 0x7fff) << 16;
}
static int
aoehdr_atainit(struct aoedev *d, struct aoetgt *t, struct aoe_hdr *h)
{
u32 host_tag = newtag(t);
memcpy(h->src, t->ifp->nd->dev_addr, sizeof h->src);
memcpy(h->dst, t->addr, sizeof h->dst);
h->type = __constant_cpu_to_be16(ETH_P_AOE);
h->verfl = AOE_HVER;
h->major = cpu_to_be16(d->aoemajor);
h->minor = d->aoeminor;
h->cmd = AOECMD_ATA;
h->tag = cpu_to_be32(host_tag);
return host_tag;
}
static inline void
put_lba(struct aoe_atahdr *ah, sector_t lba)
{
ah->lba0 = lba;
ah->lba1 = lba >>= 8;
ah->lba2 = lba >>= 8;
ah->lba3 = lba >>= 8;
ah->lba4 = lba >>= 8;
ah->lba5 = lba >>= 8;
}
static void
ifrotate(struct aoetgt *t)
{
t->ifp++;
if (t->ifp >= &t->ifs[NAOEIFS] || t->ifp->nd == NULL)
t->ifp = t->ifs;
if (t->ifp->nd == NULL) {
printk(KERN_INFO "aoe: no interface to rotate to\n");
BUG();
}
}
static void
skb_pool_put(struct aoedev *d, struct sk_buff *skb)
{
__skb_queue_tail(&d->skbpool, skb);
}
static struct sk_buff *
skb_pool_get(struct aoedev *d)
{
struct sk_buff *skb = skb_peek(&d->skbpool);
if (skb && atomic_read(&skb_shinfo(skb)->dataref) == 1) {
__skb_unlink(skb, &d->skbpool);
return skb;
}
if (skb_queue_len(&d->skbpool) < NSKBPOOLMAX &&
(skb = new_skb(ETH_ZLEN)))
return skb;
return NULL;
}
/* freeframe is where we do our load balancing so it's a little hairy. */
static struct frame *
freeframe(struct aoedev *d)
{
struct frame *f, *e, *rf;
struct aoetgt **t;
struct sk_buff *skb;
if (d->targets[0] == NULL) { /* shouldn't happen, but I'm paranoid */
printk(KERN_ERR "aoe: NULL TARGETS!\n");
return NULL;
}
t = d->tgt;
t++;
if (t >= &d->targets[NTARGETS] || !*t)
t = d->targets;
for (;;) {
if ((*t)->nout < (*t)->maxout
&& t != d->htgt
&& (*t)->ifp->nd) {
rf = NULL;
f = (*t)->frames;
e = f + (*t)->nframes;
for (; f < e; f++) {
if (f->tag != FREETAG)
continue;
skb = f->skb;
if (!skb
&& !(f->skb = skb = new_skb(ETH_ZLEN)))
continue;
if (atomic_read(&skb_shinfo(skb)->dataref)
!= 1) {
if (!rf)
rf = f;
continue;
}
gotone: skb_shinfo(skb)->nr_frags = skb->data_len = 0;
skb_trim(skb, 0);
d->tgt = t;
ifrotate(*t);
return f;
}
/* Work can be done, but the network layer is
holding our precious packets. Try to grab
one from the pool. */
f = rf;
if (f == NULL) { /* more paranoia */
printk(KERN_ERR
"aoe: freeframe: %s.\n",
"unexpected null rf");
d->flags |= DEVFL_KICKME;
return NULL;
}
skb = skb_pool_get(d);
if (skb) {
skb_pool_put(d, f->skb);
f->skb = skb;
goto gotone;
}
(*t)->dataref++;
if ((*t)->nout == 0)
d->flags |= DEVFL_KICKME;
}
if (t == d->tgt) /* we've looped and found nada */
break;
t++;
if (t >= &d->targets[NTARGETS] || !*t)
t = d->targets;
}
return NULL;
}
static int
aoecmd_ata_rw(struct aoedev *d)
{
struct frame *f;
struct aoe_hdr *h;
struct aoe_atahdr *ah;
struct buf *buf;
struct bio_vec *bv;
struct aoetgt *t;
struct sk_buff *skb;
ulong bcnt;
char writebit, extbit;
writebit = 0x10;
extbit = 0x4;
f = freeframe(d);
if (f == NULL)
return 0;
t = *d->tgt;
buf = d->inprocess;
bv = buf->bv;
bcnt = t->ifp->maxbcnt;
if (bcnt == 0)
bcnt = DEFAULTBCNT;
if (bcnt > buf->bv_resid)
bcnt = buf->bv_resid;
/* initialize the headers & frame */
skb = f->skb;
h = (struct aoe_hdr *) skb_mac_header(skb);
ah = (struct aoe_atahdr *) (h+1);
skb_put(skb, sizeof *h + sizeof *ah);
memset(h, 0, skb->len);
f->tag = aoehdr_atainit(d, t, h);
t->nout++;
f->waited = 0;
f->buf = buf;
f->bufaddr = page_address(bv->bv_page) + buf->bv_off;
f->bcnt = bcnt;
f->lba = buf->sector;
/* set up ata header */
ah->scnt = bcnt >> 9;
put_lba(ah, buf->sector);
if (d->flags & DEVFL_EXT) {
ah->aflags |= AOEAFL_EXT;
} else {
extbit = 0;
ah->lba3 &= 0x0f;
ah->lba3 |= 0xe0; /* LBA bit + obsolete 0xa0 */
}
if (bio_data_dir(buf->bio) == WRITE) {
skb_fill_page_desc(skb, 0, bv->bv_page, buf->bv_off, bcnt);
ah->aflags |= AOEAFL_WRITE;
skb->len += bcnt;
skb->data_len = bcnt;
t->wpkts++;
} else {
t->rpkts++;
writebit = 0;
}
ah->cmdstat = ATA_CMD_PIO_READ | writebit | extbit;
/* mark all tracking fields and load out */
buf->nframesout += 1;
buf->bv_off += bcnt;
buf->bv_resid -= bcnt;
buf->resid -= bcnt;
buf->sector += bcnt >> 9;
if (buf->resid == 0) {
d->inprocess = NULL;
} else if (buf->bv_resid == 0) {
buf->bv = ++bv;
buf->bv_resid = bv->bv_len;
WARN_ON(buf->bv_resid == 0);
buf->bv_off = bv->bv_offset;
}
skb->dev = t->ifp->nd;
skb = skb_clone(skb, GFP_ATOMIC);
if (skb)
__skb_queue_tail(&d->sendq, skb);
return 1;
}
/* some callers cannot sleep, and they can call this function,
* transmitting the packets later, when interrupts are on
*/
static void
aoecmd_cfg_pkts(ushort aoemajor, unsigned char aoeminor, struct sk_buff_head *queue)
{
struct aoe_hdr *h;
struct aoe_cfghdr *ch;
struct sk_buff *skb;
struct net_device *ifp;
read_lock(&dev_base_lock);
for_each_netdev(&init_net, ifp) {
dev_hold(ifp);
if (!is_aoe_netif(ifp))
goto cont;
skb = new_skb(sizeof *h + sizeof *ch);
if (skb == NULL) {
printk(KERN_INFO "aoe: skb alloc failure\n");
goto cont;
}
skb_put(skb, sizeof *h + sizeof *ch);
skb->dev = ifp;
__skb_queue_tail(queue, skb);
h = (struct aoe_hdr *) skb_mac_header(skb);
memset(h, 0, sizeof *h + sizeof *ch);
memset(h->dst, 0xff, sizeof h->dst);
memcpy(h->src, ifp->dev_addr, sizeof h->src);
h->type = __constant_cpu_to_be16(ETH_P_AOE);
h->verfl = AOE_HVER;
h->major = cpu_to_be16(aoemajor);
h->minor = aoeminor;
h->cmd = AOECMD_CFG;
cont:
dev_put(ifp);
}
read_unlock(&dev_base_lock);
}
static void
resend(struct aoedev *d, struct aoetgt *t, struct frame *f)
{
struct sk_buff *skb;
struct aoe_hdr *h;
struct aoe_atahdr *ah;
char buf[128];
u32 n;
ifrotate(t);
n = newtag(t);
skb = f->skb;
h = (struct aoe_hdr *) skb_mac_header(skb);
ah = (struct aoe_atahdr *) (h+1);
snprintf(buf, sizeof buf,
"%15s e%ld.%d oldtag=%08x@%08lx newtag=%08x s=%pm d=%pm nout=%d\n",
"retransmit", d->aoemajor, d->aoeminor, f->tag, jiffies, n,
h->src, h->dst, t->nout);
aoechr_error(buf);
f->tag = n;
h->tag = cpu_to_be32(n);
memcpy(h->dst, t->addr, sizeof h->dst);
memcpy(h->src, t->ifp->nd->dev_addr, sizeof h->src);
switch (ah->cmdstat) {
default:
break;
case ATA_CMD_PIO_READ:
case ATA_CMD_PIO_READ_EXT:
case ATA_CMD_PIO_WRITE:
case ATA_CMD_PIO_WRITE_EXT:
put_lba(ah, f->lba);
n = f->bcnt;
if (n > DEFAULTBCNT)
n = DEFAULTBCNT;
ah->scnt = n >> 9;
if (ah->aflags & AOEAFL_WRITE) {
skb_fill_page_desc(skb, 0, virt_to_page(f->bufaddr),
offset_in_page(f->bufaddr), n);
skb->len = sizeof *h + sizeof *ah + n;
skb->data_len = n;
}
}
skb->dev = t->ifp->nd;
skb = skb_clone(skb, GFP_ATOMIC);
if (skb == NULL)
return;
__skb_queue_tail(&d->sendq, skb);
}
static int
tsince(int tag)
{
int n;
n = jiffies & 0xffff;
n -= tag & 0xffff;
if (n < 0)
n += 1<<16;
return n;
}
static struct aoeif *
getif(struct aoetgt *t, struct net_device *nd)
{
struct aoeif *p, *e;
p = t->ifs;
e = p + NAOEIFS;
for (; p < e; p++)
if (p->nd == nd)
return p;
return NULL;
}
static struct aoeif *
addif(struct aoetgt *t, struct net_device *nd)
{
struct aoeif *p;
p = getif(t, NULL);
if (!p)
return NULL;
p->nd = nd;
p->maxbcnt = DEFAULTBCNT;
p->lost = 0;
p->lostjumbo = 0;
return p;
}
static void
ejectif(struct aoetgt *t, struct aoeif *ifp)
{
struct aoeif *e;
ulong n;
e = t->ifs + NAOEIFS - 1;
n = (e - ifp) * sizeof *ifp;
memmove(ifp, ifp+1, n);
e->nd = NULL;
}
static int
sthtith(struct aoedev *d)
{
struct frame *f, *e, *nf;
struct sk_buff *skb;
struct aoetgt *ht = *d->htgt;
f = ht->frames;
e = f + ht->nframes;
for (; f < e; f++) {
if (f->tag == FREETAG)
continue;
nf = freeframe(d);
if (!nf)
return 0;
skb = nf->skb;
*nf = *f;
f->skb = skb;
f->tag = FREETAG;
nf->waited = 0;
ht->nout--;
(*d->tgt)->nout++;
resend(d, *d->tgt, nf);
}
/* he's clean, he's useless. take away his interfaces */
memset(ht->ifs, 0, sizeof ht->ifs);
d->htgt = NULL;
return 1;
}
static inline unsigned char
ata_scnt(unsigned char *packet) {
struct aoe_hdr *h;
struct aoe_atahdr *ah;
h = (struct aoe_hdr *) packet;
ah = (struct aoe_atahdr *) (h+1);
return ah->scnt;
}
static void
rexmit_timer(ulong vp)
{
struct sk_buff_head queue;
struct aoedev *d;
struct aoetgt *t, **tt, **te;
struct aoeif *ifp;
struct frame *f, *e;
register long timeout;
ulong flags, n;
d = (struct aoedev *) vp;
/* 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) {
spin_unlock_irqrestore(&d->lock, flags);
return;
}
tt = d->targets;
te = tt + NTARGETS;
for (; tt < te && *tt; tt++) {
t = *tt;
f = t->frames;
e = f + t->nframes;
for (; f < e; f++) {
if (f->tag == FREETAG
|| tsince(f->tag) < timeout)
continue;
n = f->waited += timeout;
n /= HZ;
if (n > aoe_deadsecs) {
/* waited too long. device failure. */
aoedev_downdev(d);
break;
}
if (n > HELPWAIT /* see if another target can help */
&& (tt != d->targets || d->targets[1]))
d->htgt = tt;
if (t->nout == t->maxout) {
if (t->maxout > 1)
t->maxout--;
t->lastwadj = jiffies;
}
ifp = getif(t, f->skb->dev);
if (ifp && ++ifp->lost > (t->nframes << 1)
&& (ifp != t->ifs || t->ifs[1].nd)) {
ejectif(t, ifp);
ifp = NULL;
}
if (ata_scnt(skb_mac_header(f->skb)) > DEFAULTBCNT / 512
&& ifp && ++ifp->lostjumbo > (t->nframes << 1)
&& ifp->maxbcnt != DEFAULTBCNT) {
printk(KERN_INFO
"aoe: e%ld.%d: "
"too many lost jumbo on "
"%s:%pm - "
"falling back to %d frames.\n",
d->aoemajor, d->aoeminor,
ifp->nd->name, t->addr,
DEFAULTBCNT);
ifp->maxbcnt = 0;
}
resend(d, t, f);
}
/* window check */
if (t->nout == t->maxout
&& t->maxout < t->nframes
&& (jiffies - t->lastwadj)/HZ > 10) {
t->maxout++;
t->lastwadj = jiffies;
}
}
if (!skb_queue_empty(&d->sendq)) {
n = d->rttavg <<= 1;
if (n > MAXTIMER)
d->rttavg = MAXTIMER;
}
if (d->flags & DEVFL_KICKME || d->htgt) {
d->flags &= ~DEVFL_KICKME;
aoecmd_work(d);
}
__skb_queue_head_init(&queue);
skb_queue_splice_init(&d->sendq, &queue);
d->timer.expires = jiffies + TIMERTICK;
add_timer(&d->timer);
spin_unlock_irqrestore(&d->lock, flags);
aoenet_xmit(&queue);
}
/* enters with d->lock held */
void
aoecmd_work(struct aoedev *d)
{
struct buf *buf;
loop:
if (d->htgt && !sthtith(d))
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);
d->inprocess = buf;
}
if (aoecmd_ata_rw(d))
goto loop;
}
/* this function performs work that has been deferred until sleeping is OK
*/
void
aoecmd_sleepwork(struct work_struct *work)
{
struct aoedev *d = container_of(work, struct aoedev, work);
if (d->flags & DEVFL_GDALLOC)
aoeblk_gdalloc(d);
if (d->flags & DEVFL_NEWSIZE) {
struct block_device *bd;
unsigned long flags;
u64 ssize;
ssize = get_capacity(d->gd);
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, struct aoetgt *t, unsigned char *id)
{
u64 ssize;
u16 n;
/* word 83: command set supported */
n = get_unaligned_le16(&id[83 << 1]);
/* word 86: command set/feature enabled */
n |= get_unaligned_le16(&id[86 << 1]);
if (n & (1<<10)) { /* bit 10: LBA 48 */
d->flags |= DEVFL_EXT;
/* word 100: number lba48 sectors */
ssize = 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 = get_unaligned_le32(&id[60 << 1]);
/* NOTE: obsolete in ATA 6 */
d->geo.cylinders = get_unaligned_le16(&id[54 << 1]);
d->geo.heads = get_unaligned_le16(&id[55 << 1]);
d->geo.sectors = get_unaligned_le16(&id[56 << 1]);
}
if (d->ssize != ssize)
printk(KERN_INFO
"aoe: %pm e%ld.%d v%04x has %llu sectors\n",
t->addr,
d->aoemajor, d->aoeminor,
d->fw_ver, (long long)ssize);
d->ssize = ssize;
d->geo.start = 0;
if (d->flags & (DEVFL_GDALLOC|DEVFL_NEWSIZE))
return;
if (d->gd != NULL) {
set_capacity(d->gd, ssize);
d->flags |= DEVFL_NEWSIZE;
} else
d->flags |= DEVFL_GDALLOC;
schedule_work(&d->work);
}
static void
calc_rttavg(struct aoedev *d, int rtt)
{
register long n;
n = rtt;
if (n < 0) {
n = -rtt;
if (n < MINTIMER)
n = MINTIMER;
else if (n > MAXTIMER)
n = MAXTIMER;
d->mintimer += (n - d->mintimer) >> 1;
} else if (n < d->mintimer)
n = d->mintimer;
else if (n > MAXTIMER)
n = MAXTIMER;
/* g == .25; cf. Congestion Avoidance and Control, Jacobson & Karels; 1988 */
n -= d->rttavg;
d->rttavg += n >> 2;
}
static struct aoetgt *
gettgt(struct aoedev *d, char *addr)
{
struct aoetgt **t, **e;
t = d->targets;
e = t + NTARGETS;
for (; t < e && *t; t++)
if (memcmp((*t)->addr, addr, sizeof((*t)->addr)) == 0)
return *t;
return NULL;
}
static inline void
diskstats(struct gendisk *disk, struct bio *bio, ulong duration, sector_t sector)
{
unsigned long n_sect = bio->bi_size >> 9;
const int rw = bio_data_dir(bio);
struct hd_struct *part;
int cpu;
cpu = part_stat_lock();
part = disk_map_sector_rcu(disk, sector);
part_stat_inc(cpu, part, ios[rw]);
part_stat_add(cpu, part, ticks[rw], duration);
part_stat_add(cpu, part, sectors[rw], n_sect);
part_stat_add(cpu, part, io_ticks, duration);
part_stat_unlock();
}
/*
* Ensure we don't create aliases in VI caches
*/
static inline void
killalias(struct bio *bio)
{
struct bio_vec *bv;
int i;
if (bio_data_dir(bio) == READ)
__bio_for_each_segment(bv, bio, i, 0) {
flush_dcache_page(bv->bv_page);
}
}
void
aoecmd_ata_rsp(struct sk_buff *skb)
{
struct sk_buff_head queue;
struct aoedev *d;
struct aoe_hdr *hin, *hout;
struct aoe_atahdr *ahin, *ahout;
struct frame *f;
struct buf *buf;
struct aoetgt *t;
struct aoeif *ifp;
register long n;
ulong flags;
char ebuf[128];
u16 aoemajor;
hin = (struct aoe_hdr *) skb_mac_header(skb);
aoemajor = get_unaligned_be16(&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);
n = get_unaligned_be32(&hin->tag);
t = gettgt(d, hin->src);
if (t == NULL) {
printk(KERN_INFO "aoe: can't find target e%ld.%d:%pm\n",
d->aoemajor, d->aoeminor, hin->src);
spin_unlock_irqrestore(&d->lock, flags);
return;
}
f = getframe(t, n);
if (f == NULL) {
calc_rttavg(d, -tsince(n));
spin_unlock_irqrestore(&d->lock, flags);
snprintf(ebuf, sizeof ebuf,
"%15s e%d.%d tag=%08x@%08lx\n",
"unexpected rsp",
get_unaligned_be16(&hin->major),
hin->minor,
get_unaligned_be32(&hin->tag),
jiffies);
aoechr_error(ebuf);
return;
}
calc_rttavg(d, tsince(f->tag));
ahin = (struct aoe_atahdr *) (hin+1);
hout = (struct aoe_hdr *) skb_mac_header(f->skb);
ahout = (struct aoe_atahdr *) (hout+1);
buf = f->buf;
if (ahin->cmdstat & 0xa9) { /* these bits cleared on success */
printk(KERN_ERR
"aoe: ata error cmd=%2.2Xh stat=%2.2Xh from e%ld.%d\n",
ahout->cmdstat, ahin->cmdstat,
d->aoemajor, d->aoeminor);
if (buf)
buf->flags |= BUFFL_FAIL;
} else {
if (d->htgt && t == *d->htgt) /* I'll help myself, thank you. */
d->htgt = NULL;
n = ahout->scnt << 9;
switch (ahout->cmdstat) {
case ATA_CMD_PIO_READ:
case ATA_CMD_PIO_READ_EXT:
if (skb->len - sizeof *hin - sizeof *ahin < n) {
printk(KERN_ERR
"aoe: %s. skb->len=%d need=%ld\n",
"runt data size in read", skb->len, n);
/* fail frame f? just returning will rexmit. */
spin_unlock_irqrestore(&d->lock, flags);
return;
}
memcpy(f->bufaddr, ahin+1, n);
case ATA_CMD_PIO_WRITE:
case ATA_CMD_PIO_WRITE_EXT:
ifp = getif(t, skb->dev);
if (ifp) {
ifp->lost = 0;
if (n > DEFAULTBCNT)
ifp->lostjumbo = 0;
}
if (f->bcnt -= n) {
f->lba += n >> 9;
f->bufaddr += n;
resend(d, t, f);
goto xmit;
}
break;
case ATA_CMD_ID_ATA:
if (skb->len - sizeof *hin - sizeof *ahin < 512) {
printk(KERN_INFO
"aoe: runt data size in ataid. skb->len=%d\n",
skb->len);
spin_unlock_irqrestore(&d->lock, flags);
return;
}
ataid_complete(d, t, (char *) (ahin+1));
break;
default:
printk(KERN_INFO
"aoe: unrecognized ata command %2.2Xh for %d.%d\n",
ahout->cmdstat,
get_unaligned_be16(&hin->major),
hin->minor);
}
}
if (buf && --buf->nframesout == 0 && buf->resid == 0) {
diskstats(d->gd, buf->bio, jiffies - buf->stime, buf->sector);
if (buf->flags & BUFFL_FAIL)
bio_endio(buf->bio, -EIO);
else {
killalias(buf->bio);
bio_endio(buf->bio, 0);
}
mempool_free(buf, d->bufpool);
}
f->buf = NULL;
f->tag = FREETAG;
t->nout--;
aoecmd_work(d);
xmit:
__skb_queue_head_init(&queue);
skb_queue_splice_init(&d->sendq, &queue);
spin_unlock_irqrestore(&d->lock, flags);
aoenet_xmit(&queue);
}
void
aoecmd_cfg(ushort aoemajor, unsigned char aoeminor)
{
struct sk_buff_head queue;
__skb_queue_head_init(&queue);
aoecmd_cfg_pkts(aoemajor, aoeminor, &queue);
aoenet_xmit(&queue);
}
struct sk_buff *
aoecmd_ata_id(struct aoedev *d)
{
struct aoe_hdr *h;
struct aoe_atahdr *ah;
struct frame *f;
struct sk_buff *skb;
struct aoetgt *t;
f = freeframe(d);
if (f == NULL)
return NULL;
t = *d->tgt;
/* initialize the headers & frame */
skb = f->skb;
h = (struct aoe_hdr *) skb_mac_header(skb);
ah = (struct aoe_atahdr *) (h+1);
skb_put(skb, sizeof *h + sizeof *ah);
memset(h, 0, skb->len);
f->tag = aoehdr_atainit(d, t, h);
t->nout++;
f->waited = 0;
/* set up ata header */
ah->scnt = 1;
ah->cmdstat = ATA_CMD_ID_ATA;
ah->lba3 = 0xa0;
skb->dev = t->ifp->nd;
d->rttavg = MAXTIMER;
d->timer.function = rexmit_timer;
return skb_clone(skb, GFP_ATOMIC);
}
static struct aoetgt *
addtgt(struct aoedev *d, char *addr, ulong nframes)
{
struct aoetgt *t, **tt, **te;
struct frame *f, *e;
tt = d->targets;
te = tt + NTARGETS;
for (; tt < te && *tt; tt++)
;
if (tt == te) {
printk(KERN_INFO
"aoe: device addtgt failure; too many targets\n");
return NULL;
}
t = kcalloc(1, sizeof *t, GFP_ATOMIC);
f = kcalloc(nframes, sizeof *f, GFP_ATOMIC);
if (!t || !f) {
kfree(f);
kfree(t);
printk(KERN_INFO "aoe: cannot allocate memory to add target\n");
return NULL;
}
t->nframes = nframes;
t->frames = f;
e = f + nframes;
for (; f < e; f++)
f->tag = FREETAG;
memcpy(t->addr, addr, sizeof t->addr);
t->ifp = t->ifs;
t->maxout = t->nframes;
return *tt = t;
}
void
aoecmd_cfg_rsp(struct sk_buff *skb)
{
struct aoedev *d;
struct aoe_hdr *h;
struct aoe_cfghdr *ch;
struct aoetgt *t;
struct aoeif *ifp;
ulong flags, sysminor, aoemajor;
struct sk_buff *sl;
u16 n;
h = (struct aoe_hdr *) skb_mac_header(skb);
ch = (struct aoe_cfghdr *) (h+1);
/*
* Enough people have their dip switches set backwards to
* warrant a loud message for this special case.
*/
aoemajor = get_unaligned_be16(&h->major);
if (aoemajor == 0xfff) {
printk(KERN_ERR "aoe: 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;
}
n = be16_to_cpu(ch->bufcnt);
if (n > aoe_maxout) /* keep it reasonable */
n = aoe_maxout;
d = aoedev_by_sysminor_m(sysminor);
if (d == NULL) {
printk(KERN_INFO "aoe: device sysminor_m failure\n");
return;
}
spin_lock_irqsave(&d->lock, flags);
t = gettgt(d, h->src);
if (!t) {
t = addtgt(d, h->src, n);
if (!t) {
spin_unlock_irqrestore(&d->lock, flags);
return;
}
}
ifp = getif(t, skb->dev);
if (!ifp) {
ifp = addif(t, skb->dev);
if (!ifp) {
printk(KERN_INFO
"aoe: device addif failure; "
"too many interfaces?\n");
spin_unlock_irqrestore(&d->lock, flags);
return;
}
}
if (ifp->maxbcnt) {
n = ifp->nd->mtu;
n -= sizeof (struct aoe_hdr) + sizeof (struct aoe_atahdr);
n /= 512;
if (n > ch->scnt)
n = ch->scnt;
n = n ? n * 512 : DEFAULTBCNT;
if (n != ifp->maxbcnt) {
printk(KERN_INFO
"aoe: e%ld.%d: setting %d%s%s:%pm\n",
d->aoemajor, d->aoeminor, n,
" byte data frames on ", ifp->nd->name,
t->addr);
ifp->maxbcnt = n;
}
}
/* don't change users' perspective */
if (d->nopen) {
spin_unlock_irqrestore(&d->lock, flags);
return;
}
d->fw_ver = be16_to_cpu(ch->fwver);
sl = aoecmd_ata_id(d);
spin_unlock_irqrestore(&d->lock, flags);
if (sl) {
struct sk_buff_head queue;
__skb_queue_head_init(&queue);
__skb_queue_tail(&queue, sl);
aoenet_xmit(&queue);
}
}
void
aoecmd_cleanslate(struct aoedev *d)
{
struct aoetgt **t, **te;
struct aoeif *p, *e;
d->mintimer = MINTIMER;
t = d->targets;
te = t + NTARGETS;
for (; t < te && *t; t++) {
(*t)->maxout = (*t)->nframes;
p = (*t)->ifs;
e = p + NAOEIFS;
for (; p < e; p++) {
p->lostjumbo = 0;
p->lost = 0;
p->maxbcnt = DEFAULTBCNT;
}
}
}
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