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Interface to enable/disable target per channel

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git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@289 d57e44dd-8a1f-0410-8b47-8ef2f437770f
This commit is contained in:
Stanislaw Gruszka
2008-02-19 09:19:38 +00:00
parent 6fea5c313e
commit 7aeea459c0
1 changed files with 59 additions and 29 deletions
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88
qla_isp/linux/isp_scst.c
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@@ -165,7 +165,7 @@ struct bus {
ini_t * list[HASH_WIDTH]; /* hash list of known initiators */
struct scst_tgt * scst_tgt;
hba_register_t * unreg_hp; /* help to synchronize low level and SCST unregistration */
int enable; /* is target mode enabled in low level driver */
int enable; /* is target mode enabled in low level driver, one bit per channel */
int need_reg; /* before SCST registration */
};
@@ -188,7 +188,7 @@ static __inline ini_t *ini_from_notify(bus_t *, tmd_notify_t *);
static void scsi_target_start_cmd(tmd_cmd_t *, int);
static void scsi_target_done_cmd(tmd_cmd_t *, int);
static int scsi_target_thread(void *);
static int scsi_target_enadis(bus_t *, int);
static int scsi_target_enadis(bus_t *, int, int);
static bus_t busses[MAX_BUS];
@@ -647,7 +647,6 @@ scsi_target_notify(tmd_notify_t *np)
return;
}
if (ini == NULL) {
Eprintk("TMD_NOTIFY cannot find initiator 0x%016llx\n", np->nt_iid);
(*bp->h.r_action) (QIN_NOTIFY_ACK, np);
@@ -692,6 +691,12 @@ scsi_target_handler(qact_e action, void *arg)
Eprintk("version mismatch - compiled with %d, got %d\n", QR_VERSION, hp->r_version);
break;
}
/* enable bitmap size constrained */
if (hp->r_nchannels > 32) {
spin_unlock_irqrestore(&scsi_target_lock, flags);
Eprintk("isp_scst not support more than 32 channels\n");
break;
}
bp->h = *hp;
bp->need_reg = 1;
spin_unlock_irqrestore(&scsi_target_lock, flags);
@@ -826,10 +831,12 @@ scsi_target_thread(void *arg)
}
static int
scsi_target_enadis(bus_t *bp, int en)
scsi_target_enadis(bus_t *bp, int chan, int en)
{
DECLARE_MUTEX_LOCKED(rsem);
enadis_t ec;
info_t info;
int old_en, err;
/*
* XXX: yes, there is a race condition here where the bus can
@@ -842,8 +849,19 @@ scsi_target_enadis(bus_t *bp, int en)
return (-ENXIO);
}
if (bp->enable == en)
old_en = test_bit(chan, &bp->enable);
if (old_en == en) {
return (0);
}
memset(&info, 0, sizeof (info));
info.i_identity = bp->h.r_identity;
info.i_channel = chan;
(*bp->h.r_action)(QIN_GETINFO, &info);
if (info.i_error) {
err = info.i_error;
goto failed;
}
memset(&ec, 0, sizeof (ec));
ec.en_hba = bp->h.r_identity;
@@ -860,12 +878,15 @@ scsi_target_enadis(bus_t *bp, int en)
down(&rsem);
if (ec.en_error) {
SDprintk("%s: HBA returned %d for %s action\n", __FUNCTION__, ec.en_error, en? "enable" : "disable");
return (ec.en_error);
err = ec.en_error;
goto failed;
}
bp->enable = en;
change_bit(chan, &bp->enable);
return (0);
failed:
Eprintk("%s%d: %s channel %d failed with error %d\n", bp->h.r_name, bp->h.r_inst, en ? "enable" : "disable", chan, err);
return (err);
}
static int
@@ -1001,40 +1022,49 @@ static int
isp_read_proc(struct seq_file *seq, struct scst_tgt *tgt)
{
bus_t *bp;
SDprintk("%s\n", __FUNCTION__);
int chan;
bp = tgt->tgt_priv;
if (!bp)
return -ENODEV;
seq_printf(seq, "%d\n", bp->enable);
return 0;
if (!bp) {
return (-ENODEV);
}
for (chan = 0; chan < bp->h.r_nchannels; chan++) {
seq_printf(seq, "%d:%d\n", chan, test_bit(chan, &bp->enable) ? 1 : 0);
}
return (0);
}
static int
isp_write_proc(char *buf, char **start, off_t offset, int len, int *eof, struct scst_tgt *tgt)
{
bus_t *bp;
int ret, en;
char *end = buf + len;
int ret, en, chan;
SDprintk("%s\n", __FUNCTION__);
bp = tgt->tgt_priv;
if (!bp)
if (!bp) {
return (-ENODEV);
if (len != 2 && len != 3)
}
if (len < 3) {
return (-EINVAL);
}
chan = simple_strtoul(buf, &buf, 0);
if (chan < 0 || chan > bp->h.r_nchannels || *buf != ':') {
return (-EINVAL);
}
buf++;
if (buf >= end) {
return (-EINVAL);
}
en = buf[0] - '0';
if (en < 0 || en > 1)
if (en < 0 || en > 1) {
return (-EINVAL);
ret = scsi_target_enadis(bp, en);
if (ret < 0)
}
ret = scsi_target_enadis(bp, chan, en);
if (ret < 0) {
return (ret);
}
*eof = 1;
return (len);
}