On Fri, 2013-02-01 at 12:03 +0800, Asias He wrote:
> On 02/01/2013 04:59 AM, Nicholas A. Bellinger wrote:
> > On Thu, 2013-01-31 at 17:28 +0800, Asias He wrote:
> >> Hello Nicholas,
> >>
> >> On 01/31/2013 03:33 PM, Asias He wrote:
> >>> In order to take advantages of Paolo's multi-queue virito-scsi, we need
> >>> multi-target support in tcm_vhost first. Otherwise all the requests go
> >>> to one queue and other queues are idle.
> >>>
<SNIP>
> >>> @@ -771,14 +799,11 @@ static int vhost_scsi_set_endpoint(
> >>> }
> >>> tv_tport = tv_tpg->tport;
> >>>
> >>> - if (!strcmp(tv_tport->tport_name, t->vhost_wwpn) &&
> >>> - (tv_tpg->tport_tpgt == t->vhost_tpgt)) {
> >>> + if (!strcmp(tv_tport->tport_name, t->vhost_wwpn)) {
> >>> tv_tpg->tv_tpg_vhost_count++;
> >>> - mutex_unlock(&tv_tpg->tv_tpg_mutex);
> >>> - mutex_unlock(&tcm_vhost_mutex);
> >>>
> >>> mutex_lock(&vs->dev.mutex);
> >>> - if (vs->vs_tpg) {
> >>> + if (vs->vs_tpg[tv_tpg->tport_tpgt - 1]) {
> >>> mutex_unlock(&vs->dev.mutex);
> >>> mutex_lock(&tv_tpg->tv_tpg_mutex);
> >>> tv_tpg->tv_tpg_vhost_count--;
> >>> @@ -786,15 +811,17 @@ static int vhost_scsi_set_endpoint(
> >>> return -EEXIST;
> >>> }
> >>>
> >>> - vs->vs_tpg = tv_tpg;
> >>> + vs->vs_tpg[tv_tpg->tport_tpgt - 1] = tv_tpg;
> >>
> >>
> >> tv_tpg->tport_tpgt starts from 0, right? I thought it starts from 1,
> >> because I always got it starts from 1 in targetcli.
> >>
> >> o- vhost
> >> o- naa.6001405bd4e8476d
> >> o- tpg1
> >> o- luns
> >> o- lun0
> >> o- tpg2
> >> o- luns
> >> o- lun0
> >> o- tpg3
> >> o- luns
> >> o- lun0
> >> o- tpg4
> >> o- luns
> >> o- lun0
> >>
> >
> > So at least with iscsi-target, we start from tpgt=1 to avoid some legacy
> > initiators that have issues handling tgpt=0.
> >
> > Given that rtslib/targetcli currently expect this with the "tpgs"
> > feature is enabled, starting from tpgt=1 with tcm_vhost probably makes
> > the most sense.
>
> Okay. But tgpt can be 0, right?
>
Most certainly, in the end it's totally up to the fabric. ;)
> I saw this setup:
>
> cd /sys/kernel/config/target
> mkdir -p core/fileio_0/fileio
> echo 'fd_dev_name=/home/pbonzini/test.img,fd_dev_size=5905580032' >
> core/fileio_0/fileio/control
> echo 1 > core/fileio_0/fileio/enable
> mkdir -p vhost/naa.600140554cf3a18e/tpgt_0/lun/lun_0
> cd vhost/naa.600140554cf3a18e/tpgt_0
> ln -sf ../../../../../core/fileio_0/fileio/ lun/lun_0/virtual_scsi_port
> echo naa.60014053226f0388 > nexus
>
> And this:
>
> ** Setup wwpn and tpgt
> $ wwpn="naa.0"
> $ tpgt=/sys/kernel/config/target/vhost/$wwpn/tpgt_0
> $ nexus=$tpgt/nexus
> $ mkdir -p $tpgt
> $ echo -n $wwpn > $nexus
>
>
OK, I think you'll want to avoid the extra vs->vs_tpg[tpgt - 1] offset
above to properly support this.
--nab
>
> >> If it is true. I will cook v2 of this patch.
> >>
> >> Also, the tv_tpg->tport_tpgt can be none-continuous. e.g.
> >>
> >> o- vhost
> >> o- naa.6001405bd4e8476d
> >> o- tpg1
> >> o- luns
> >> o- lun0
> >> o- tpg2
> >> o- luns
> >> o- lun0
> >> o- tpg4
> >> o- luns
> >> o- lun0
> >>
> >> I will handle this in v2.
> >>
> >
> > Correct, tpgt values may be optionally non-contiguous up to unsigned
> > short.
>
> ok.
>
> > --nab
> >
> >
>
>
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