-/* Copyright (c) 2004 Coraid, Inc. See COPYING for GPL terms. */
+/* Copyright (c) 2006 Coraid, Inc. See COPYING for GPL terms. */
/*
* aoecmd.c
* Filesystem request handling methods
#include <linux/blkdev.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
+#include <linux/genhd.h>
#include <asm/unaligned.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)
+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.");
+
+struct sk_buff *
+new_skb(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
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)
{
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
aoecmd_ata_rw(struct aoedev *d, struct frame *f)
{
sector = buf->sector;
bcnt = buf->bv_resid;
- if (bcnt > MAXATADATA)
- bcnt = MAXATADATA;
+ if (bcnt > d->maxbcnt)
+ bcnt = d->maxbcnt;
/* initialize the headers & frame */
- h = (struct aoe_hdr *) f->data;
+ skb = f->skb;
+ h = (struct aoe_hdr *) skb->mac.raw;
ah = (struct aoe_atahdr *) (h+1);
- f->ndata = sizeof *h + sizeof *ah;
- memset(h, 0, f->ndata);
+ skb_put(skb, sizeof *h + sizeof *ah);
+ memset(h, 0, skb->len);
f->tag = aoehdr_atainit(d, h);
f->waited = 0;
f->buf = buf;
f->bufaddr = buf->bufaddr;
+ f->bcnt = bcnt;
+ f->lba = sector;
/* set up ata header */
ah->scnt = bcnt >> 9;
- ah->lba0 = sector;
- ah->lba1 = sector >>= 8;
- ah->lba2 = sector >>= 8;
- ah->lba3 = sector >>= 8;
+ put_lba(ah, sector);
if (d->flags & DEVFL_EXT) {
ah->aflags |= AOEAFL_EXT;
- ah->lba4 = sector >>= 8;
- ah->lba5 = sector >>= 8;
} else {
extbit = 0;
ah->lba3 &= 0x0f;
}
if (bio_data_dir(buf->bio) == WRITE) {
+ skb_fill_page_desc(skb, 0, virt_to_page(f->bufaddr),
+ offset_in_page(f->bufaddr), bcnt);
ah->aflags |= AOEAFL_WRITE;
- f->writedatalen = bcnt;
+ skb->len += bcnt;
+ skb->data_len = bcnt;
} else {
writebit = 0;
- f->writedatalen = 0;
}
ah->cmdstat = WIN_READ | writebit | extbit;
buf->nframesout += 1;
buf->bufaddr += bcnt;
buf->bv_resid -= bcnt;
-/* printk(KERN_INFO "aoe: bv_resid=%ld\n", buf->bv_resid); */
+/* printk(KERN_DEBUG "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++;
+ WARN_ON(buf->bv->bv_len == 0);
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 = NULL;
- if (d->sendq_hd)
- d->sendq_tl->next = skb;
- else
- d->sendq_hd = skb;
- d->sendq_tl = skb;
+ skb->dev = d->ifp;
+ skb = skb_clone(skb, GFP_ATOMIC);
+ if (skb == NULL)
+ return;
+ if (d->sendq_hd)
+ d->sendq_tl->next = skb;
+ else
+ d->sendq_hd = skb;
+ d->sendq_tl = skb;
+}
+
+/* some callers cannot sleep, and they can call this function,
+ * transmitting the packets later, when interrupts are on
+ */
+static struct sk_buff *
+aoecmd_cfg_pkts(ushort aoemajor, unsigned char aoeminor, struct sk_buff **tail)
+{
+ struct aoe_hdr *h;
+ struct aoe_cfghdr *ch;
+ struct sk_buff *skb, *sl, *sl_tail;
+ struct net_device *ifp;
+
+ sl = sl_tail = 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(sizeof *h + sizeof *ch);
+ if (skb == NULL) {
+ printk(KERN_INFO "aoe: skb alloc failure\n");
+ continue;
+ }
+ skb_put(skb, sizeof *h + sizeof *ch);
+ skb->dev = ifp;
+ if (sl_tail == NULL)
+ sl_tail = skb;
+ 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);
+ 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;
+
+ skb->next = sl;
+ sl = skb;
}
+ read_unlock(&dev_base_lock);
+
+ if (tail != NULL)
+ *tail = sl_tail;
+ return sl;
+}
+
+static struct frame *
+freeframe(struct aoedev *d)
+{
+ struct frame *f, *e;
+ int n = 0;
+
+ f = d->frames;
+ e = f + d->nframes;
+ for (; f<e; f++) {
+ if (f->tag != FREETAG)
+ continue;
+ if (atomic_read(&skb_shinfo(f->skb)->dataref) == 1) {
+ skb_shinfo(f->skb)->nr_frags = f->skb->data_len = 0;
+ skb_trim(f->skb, 0);
+ return f;
+ }
+ n++;
+ }
+ if (n == d->nframes) /* wait for network layer */
+ d->flags |= DEVFL_KICKME;
+
+ return NULL;
}
/* enters with d->lock held */
{
struct frame *f;
struct buf *buf;
+
+ if (d->flags & DEVFL_PAUSE) {
+ if (!aoedev_isbusy(d))
+ d->sendq_hd = aoecmd_cfg_pkts(d->aoemajor,
+ d->aoeminor, &d->sendq_tl);
+ return;
+ }
+
loop:
- f = getframe(d, FREETAG);
+ f = freeframe(d);
if (f == NULL)
return;
if (d->inprocess == NULL) {
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); */
+/*printk(KERN_DEBUG "aoe: bi_size=%ld\n", buf->bio->bi_size); */
d->inprocess = buf;
}
aoecmd_ata_rw(d, f);
{
struct sk_buff *skb;
struct aoe_hdr *h;
+ struct aoe_atahdr *ah;
char buf[128];
u32 n;
d->aoemajor, d->aoeminor, f->tag, jiffies, n);
aoechr_error(buf);
- h = (struct aoe_hdr *) f->data;
+ skb = f->skb;
+ h = (struct aoe_hdr *) skb->mac.raw;
+ ah = (struct aoe_atahdr *) (h+1);
f->tag = n;
h->tag = cpu_to_be32(n);
+ memcpy(h->dst, d->addr, sizeof h->dst);
+ memcpy(h->src, d->ifp->dev_addr, sizeof h->src);
- skb = skb_prepare(d, f);
- if (skb) {
- skb->next = NULL;
- if (d->sendq_hd)
- d->sendq_tl->next = skb;
- else
- d->sendq_hd = skb;
- d->sendq_tl = skb;
+ n = DEFAULTBCNT / 512;
+ if (ah->scnt > n) {
+ ah->scnt = n;
+ if (ah->aflags & AOEAFL_WRITE) {
+ skb_fill_page_desc(skb, 0, virt_to_page(f->bufaddr),
+ offset_in_page(f->bufaddr), DEFAULTBCNT);
+ skb->len = sizeof *h + sizeof *ah + DEFAULTBCNT;
+ skb->data_len = DEFAULTBCNT;
+ }
+ if (++d->lostjumbo > (d->nframes << 1))
+ if (d->maxbcnt != DEFAULTBCNT) {
+ printk(KERN_INFO "aoe: e%ld.%ld: too many lost jumbo on %s - using 1KB frames.\n",
+ d->aoemajor, d->aoeminor, d->ifp->name);
+ d->maxbcnt = DEFAULTBCNT;
+ d->flags |= DEVFL_MAXBCNT;
+ }
}
+
+ skb->dev = d->ifp;
+ skb = skb_clone(skb, GFP_ATOMIC);
+ if (skb == NULL)
+ return;
+ if (d->sendq_hd)
+ d->sendq_tl->next = skb;
+ else
+ d->sendq_hd = skb;
+ d->sendq_tl = skb;
}
static int
spin_lock_irqsave(&d->lock, flags);
if (d->flags & DEVFL_TKILL) {
-tdie: spin_unlock_irqrestore(&d->lock, flags);
+ spin_unlock_irqrestore(&d->lock, flags);
return;
}
f = d->frames;
if (f->tag != FREETAG && tsince(f->tag) >= timeout) {
n = f->waited += timeout;
n /= HZ;
- if (n > MAXWAIT) { /* waited too long. device failure. */
+ if (n > aoe_deadsecs) { /* waited too long for response */
aoedev_downdev(d);
- goto tdie;
+ break;
}
rexmit(d, f);
}
}
+ if (d->flags & DEVFL_KICKME) {
+ d->flags &= ~DEVFL_KICKME;
+ aoecmd_work(d);
+ }
sl = d->sendq_hd;
d->sendq_hd = d->sendq_tl = NULL;
aoenet_xmit(sl);
}
+/* 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 = 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)
{
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_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;
+ d->flags |= DEVFL_NEWSIZE;
+ } else {
+ if (d->flags & DEVFL_GDALLOC) {
+ printk(KERN_ERR "aoe: can't schedule work for e%lu.%lu, %s\n",
+ d->aoemajor, d->aoeminor,
+ "it's already on! This shouldn't happen.\n");
+ return;
+ }
+ d->flags |= DEVFL_GDALLOC;
}
- INIT_WORK(&d->work, aoeblk_gdalloc, d);
schedule_work(&d->work);
- d->flags |= DEVFL_WORKON;
}
static void
register long n;
n = rtt;
- if (n < MINTIMER)
- n = MINTIMER;
+ 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;
aoecmd_ata_rsp(struct sk_buff *skb)
{
struct aoedev *d;
- struct aoe_hdr *hin;
+ struct aoe_hdr *hin, *hout;
struct aoe_atahdr *ahin, *ahout;
struct frame *f;
struct buf *buf;
spin_lock_irqsave(&d->lock, flags);
- f = getframe(d, be32_to_cpu(hin->tag));
+ n = be32_to_cpu(hin->tag);
+ f = getframe(d, 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",
calc_rttavg(d, tsince(f->tag));
ahin = (struct aoe_atahdr *) (hin+1);
- ahout = (struct aoe_atahdr *) (f->data + sizeof(struct aoe_hdr));
+ hout = (struct aoe_hdr *) f->skb->mac.raw;
+ ahout = (struct aoe_atahdr *) (hout+1);
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",
+ printk(KERN_ERR
+ "aoe: 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 {
+ n = ahout->scnt << 9;
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",
+ printk(KERN_ERR
+ "aoe: runt data size in read. skb->len=%d\n",
skb->len);
/* fail frame f? just returning will rexmit. */
spin_unlock_irqrestore(&d->lock, flags);
memcpy(f->bufaddr, ahin+1, n);
case WIN_WRITE:
case WIN_WRITE_EXT:
+ if (f->bcnt -= n) {
+ skb = f->skb;
+ f->bufaddr += n;
+ put_lba(ahout, f->lba += ahout->scnt);
+ n = f->bcnt;
+ if (n > DEFAULTBCNT)
+ n = DEFAULTBCNT;
+ ahout->scnt = n >> 9;
+ if (ahout->aflags & AOEAFL_WRITE) {
+ skb_fill_page_desc(skb, 0,
+ virt_to_page(f->bufaddr),
+ offset_in_page(f->bufaddr), n);
+ skb->len = sizeof *hout + sizeof *ahout + n;
+ skb->data_len = n;
+ }
+ f->tag = newtag(d);
+ hout->tag = cpu_to_be32(f->tag);
+ skb->dev = d->ifp;
+ skb = skb_clone(skb, GFP_ATOMIC);
+ spin_unlock_irqrestore(&d->lock, flags);
+ if (skb)
+ aoenet_xmit(skb);
+ return;
+ }
+ if (n > DEFAULTBCNT)
+ d->lostjumbo = 0;
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);
+ 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, (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(hin->major),
- hin->minor);
+ printk(KERN_INFO
+ "aoe: unrecognized ata command %2.2Xh for %d.%d\n",
+ ahout->cmdstat,
+ be16_to_cpu(hin->major),
+ hin->minor);
}
}
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 aoe_hdr *h;
- struct aoe_cfghdr *ch;
- struct sk_buff *skb, *sl;
- struct net_device *ifp;
-
- 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);
- 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;
+ struct sk_buff *sl;
- skb->next = sl;
- sl = skb;
- }
- read_unlock(&dev_base_lock);
+ sl = aoecmd_cfg_pkts(aoemajor, aoeminor, NULL);
aoenet_xmit(sl);
}
struct frame *f;
struct sk_buff *skb;
- f = getframe(d, FREETAG);
+ f = freeframe(d);
if (f == NULL) {
- printk(KERN_CRIT "aoe: aoecmd_ata_id: can't get a frame. "
- "This shouldn't happen.\n");
+ printk(KERN_ERR "aoe: can't get a frame. This shouldn't happen.\n");
return NULL;
}
/* initialize the headers & frame */
- h = (struct aoe_hdr *) f->data;
+ skb = f->skb;
+ h = (struct aoe_hdr *) skb->mac.raw;
ah = (struct aoe_atahdr *) (h+1);
- f->ndata = sizeof *h + sizeof *ah;
- memset(h, 0, f->ndata);
+ skb_put(skb, sizeof *h + sizeof *ah);
+ memset(h, 0, skb->len);
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);
+ skb->dev = d->ifp;
- /* we now want to start the rexmit tracking */
- d->flags &= ~DEVFL_TKILL;
- d->timer.data = (ulong) d;
+ d->rttavg = MAXTIMER;
d->timer.function = rexmit_timer;
- d->timer.expires = jiffies + TIMERTICK;
- add_timer(&d->timer);
- return skb;
+ return skb_clone(skb, GFP_ATOMIC);
}
void
struct aoe_hdr *h;
struct aoe_cfghdr *ch;
ulong flags, sysminor, aoemajor;
- u16 bufcnt;
struct sk_buff *sl;
- enum { MAXFRAMES = 8 };
+ enum { MAXFRAMES = 16 };
+ u16 n;
h = (struct aoe_hdr *) skb->mac.raw;
ch = (struct aoe_cfghdr *) (h+1);
*/
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");
+ 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",
+ 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;
+ n = be16_to_cpu(ch->bufcnt);
+ if (n > MAXFRAMES) /* keep it reasonable */
+ n = MAXFRAMES;
- d = aoedev_set(sysminor, h->src, skb->dev, bufcnt);
+ d = aoedev_by_sysminor_m(sysminor, n);
if (d == NULL) {
- printk(KERN_INFO "aoe: aoecmd_cfg_rsp: device set failure\n");
+ printk(KERN_INFO "aoe: device sysminor_m failure\n");
return;
}
spin_lock_irqsave(&d->lock, flags);
- if (d->flags & (DEVFL_UP | DEVFL_CLOSEWAIT)) {
+ /* permit device to migrate mac and network interface */
+ d->ifp = skb->dev;
+ memcpy(d->addr, h->src, sizeof d->addr);
+ if (!(d->flags & DEVFL_MAXBCNT)) {
+ n = d->ifp->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 != d->maxbcnt) {
+ printk(KERN_INFO
+ "aoe: e%ld.%ld: setting %d byte data frames on %s\n",
+ d->aoemajor, d->aoeminor, n, d->ifp->name);
+ d->maxbcnt = n;
+ }
+ }
+
+ /* 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->mintimer = MINTIMER;
d->fw_ver = be16_to_cpu(ch->fwver);
- /* we get here only if the device is new */
- sl = aoecmd_ata_id(d);
+ /* check for already outstanding ataid */
+ sl = aoedev_isbusy(d) == 0 ? aoecmd_ata_id(d) : NULL;
spin_unlock_irqrestore(&d->lock, flags);
git://git.onelab.eu / linux-2.6.git / blobdiff