Hi All,
I'm glad to announce that SCST 3.0 has just been released. This release includes SCST
core, target drivers iSCSI-SCST for iSCSI, including iSER support (thanks to
Mellanox!), qla2x00t for QLogic Fibre Channel adapters, ib_srpt for InfiniBand SRP,
fcst for FCoE and scst_local for local
On 09/19/2014 04:51 PM, Alex Elsayed wrote:
Not sure I follow.. How does the proposed passthrough mode prevent
someone from emulating OSDs, media changers, optical disks or anything
else in userspace with TCMU..?
The main thing that the above comments highlight is why attempting to
combine the
Nicholas A. Bellinger wrote:
> On Fri, 2014-09-19 at 14:43 -0700, Alex Elsayed wrote:
>> Nicholas A. Bellinger wrote:
>>
>>
>> > So the idea of allowing the in-kernel CDB emulation to run after
>> > user-space has returned unsupported opcode is problematic for a couple
>> > of different reasons.
From: Randy Dunlap
Fix kconfig dependency warnings which can lead to build errors:
warning: (SCSI_BNX2X_FCOE && LIBFCOE && TCM_QLA2XXX) selects LIBFC which has
unmet direct dependencies (SCSI_LOWLEVEL && SCSI && SCSI_FC_ATTRS)
warning: (FCOE && FCOE_FNIC) selects LIBFCOE which has unmet direct
On Fri, 2014-09-19 at 14:43 -0700, Alex Elsayed wrote:
> Nicholas A. Bellinger wrote:
>
>
> > So the idea of allowing the in-kernel CDB emulation to run after
> > user-space has returned unsupported opcode is problematic for a couple
> > of different reasons.
> >
> > First, if the correct featur
Hi Linus,
Here are the target pending fixes for v3.17-rc6. Please pull from:
git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending.git master
Included are Sagi's long overdue fixes related to iser-target shutdown,
along with a couple of fixes from Sebastian related to ALUA Referral
Nicholas A. Bellinger wrote:
> So the idea of allowing the in-kernel CDB emulation to run after
> user-space has returned unsupported opcode is problematic for a couple
> of different reasons.
>
> First, if the correct feature bits in standard INQUIRY + EVPD INQUIRY,
> etc are not populated by u
Hi Andy,
A few comments are inline below.
On Mon, 2014-09-15 at 16:12 -0700, Andy Grover wrote:
> Add a LIO storage engine that presents commands to userspace for execution.
> This would allow more complex backstores to be implemented out-of-kernel,
> and also make experimentation a-la FUSE (but
On 09/19/2014 05:38 AM, Christoph Hellwig wrote:
> Hi Jens, hi Tejun,
>
> I've seen multi-second boot stalls in one of my KVM setups during
> the initial scsi scan:
>
> [0.949892] scsi host0: Virtio SCSI HBA
> [1.007864] scsi 0:0:0:0: Direct-Access QEMU QEMU HARDDISK1.1.
> PQ
On 9/19/2014 3:59 PM, Bart Van Assche wrote:
> Changes in this patch:
> - Move channel variables into a new structure (struct srp_rdma_ch).
> - cm_id and completion handler context pointer are now of type
>srp_rdma_ch * insteoad of srp_target_port *.
>
s/insteoad/instead
> No functionality is
On 09/19/2014 06:55 AM, Bart Van Assche wrote:
> Hello,
>
> Although the SRP protocol supports multichannel operation, although
> since considerable time RDMA HCA's are available that support multiple
> completion vectors and although multichannel operation yields better
> performance than using a
On 9/19/2014 3:58 PM, Bart Van Assche wrote:
> Attempting to connect three times may be insufficient after an
> initiator system that was using multiple RDMA channels tries to
> relogin. Additionally, this login retry mechanism is a workaround
> for particular behavior of the IB/CM. Since the srp_d
On Fri, Sep 19, 2014 at 09:05:53PM +0300, Sagi Grimberg wrote:
> I think this patch should be squashed with passing LLD hctx patch (in
> whatever form it ends up).
Agreed.
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On Fri, Sep 19, 2014 at 11:33:15AM -0600, Jens Axboe wrote:
> That'd be fine as well. The mapping is cheap, though, but it would make
> sense to have an appropriate way to just pass it in like it happens for
> ->queue_rq() for native blk-mq drivers.
I think just passing the hw_ctx is fine. But I
On 9/19/2014 3:58 PM, Bart Van Assche wrote:
> The patch that adds multichannel support into the SRP initiator
> driver introduces an additional call to srp_free_ch_ib(). This
> patch helps to keep that later patch simple.
>
> Signed-off-by: Bart Van Assche
> ---
> drivers/infiniband/ulp/srp/ib_
On 9/19/2014 3:57 PM, Bart Van Assche wrote:
> Allow a SCSI LLD to declare how many hardware queues it supports
> by setting Scsi_Host.nr_hw_queues before calling scsi_add_host().
>
> Note: it is assumed that each hardware queue has a queue depth of
> shost->can_queue. In other words, the total que
On 9/19/2014 3:56 PM, Bart Van Assche wrote:
> [PATCH 1/8] blk-mq: Use all available hardware queues
>
> Suppose that a system has two CPU sockets, three cores per socket,
> that it does not support hyperthreading and that four hardware
> queues are provided by a block driver. With the current algo
On 09/19/2014 11:30 AM, Sagi Grimberg wrote:
> On 9/19/2014 6:38 PM, Jens Axboe wrote:
>> On 09/19/2014 09:35 AM, Bart Van Assche wrote:
>>> On 09/19/14 17:27, Ming Lei wrote:
On Fri, Sep 19, 2014 at 11:21 PM, Bart Van Assche
wrote:
> On 09/19/14 16:28, Ming Lei wrote:
>>
>>
On 9/19/2014 6:38 PM, Jens Axboe wrote:
> On 09/19/2014 09:35 AM, Bart Van Assche wrote:
>> On 09/19/14 17:27, Ming Lei wrote:
>>> On Fri, Sep 19, 2014 at 11:21 PM, Bart Van Assche
>>> wrote:
On 09/19/14 16:28, Ming Lei wrote:
>
> On Fri, Sep 19, 2014 at 9:00 PM, Bart Van Assche
>>>
On 09/19/2014 09:35 AM, Bart Van Assche wrote:
> On 09/19/14 17:27, Ming Lei wrote:
>> On Fri, Sep 19, 2014 at 11:21 PM, Bart Van Assche wrote:
>>> On 09/19/14 16:28, Ming Lei wrote:
On Fri, Sep 19, 2014 at 9:00 PM, Bart Van Assche
wrote:
>
> @@ -2643,7 +2754,8 @@ static st
On 09/19/14 17:27, Ming Lei wrote:
> On Fri, Sep 19, 2014 at 11:21 PM, Bart Van Assche wrote:
>> On 09/19/14 16:28, Ming Lei wrote:
>>>
>>> On Fri, Sep 19, 2014 at 9:00 PM, Bart Van Assche
>>> wrote:
@@ -2643,7 +2754,8 @@ static struct scsi_host_template srp_template = {
On Fri, Sep 19, 2014 at 11:21 PM, Bart Van Assche wrote:
> On 09/19/14 16:28, Ming Lei wrote:
>>
>> On Fri, Sep 19, 2014 at 9:00 PM, Bart Van Assche
>> wrote:
>>>
>>> @@ -2643,7 +2754,8 @@ static struct scsi_host_template srp_template = {
>>> .proc_name = DRV_NAME,
>
On 09/19/14 16:28, Ming Lei wrote:
On Fri, Sep 19, 2014 at 9:00 PM, Bart Van Assche wrote:
@@ -2643,7 +2754,8 @@ static struct scsi_host_template srp_template = {
.proc_name = DRV_NAME,
.slave_configure= srp_slave_configure,
.info
On Fri, Sep 19, 2014 at 9:00 PM, Bart Van Assche wrote:
> Improve performance by using multiple RDMA/RC channels per SCSI host
> for communicating with an SRP target.
>
> Signed-off-by: Bart Van Assche
> ---
> Documentation/ABI/stable/sysfs-driver-ib_srp | 25 +-
> drivers/infiniband/ulp/srp/ib
On 09/19/2014 08:18 AM, Ming Lei wrote:
> On Fri, Sep 19, 2014 at 9:07 PM, Ming Lei wrote:
>> On Fri, Sep 19, 2014 at 1:03 AM, Jens Axboe wrote:
>>> On 2014-09-18 10:35, Christoph Hellwig wrote:
On Thu, Sep 18, 2014 at 11:59:10PM +0800, Ming Lei wrote:
>
> If there are two reque
On Fri, Sep 19, 2014 at 9:07 PM, Ming Lei wrote:
> On Fri, Sep 19, 2014 at 1:03 AM, Jens Axboe wrote:
>> On 2014-09-18 10:35, Christoph Hellwig wrote:
>>>
>>> On Thu, Sep 18, 2014 at 11:59:10PM +0800, Ming Lei wrote:
If there are two requests or more timed out, the dispatch queue
i
This is a set of three fixes. One represents a nasty shared tag map
regression (another inverted condition) caused by recent SCSI MQ
patches, one is a longstanding potential buffer overrun in the iscsi
data buffer and the final one is a use after free for the rare
bidirectional commands.
The patc
On Fri, Sep 19, 2014 at 1:03 AM, Jens Axboe wrote:
> On 2014-09-18 10:35, Christoph Hellwig wrote:
>>
>> On Thu, Sep 18, 2014 at 11:59:10PM +0800, Ming Lei wrote:
>>>
>>> If there are two requests or more timed out, the dispatch queue
>>> is put into stopped state and never be recoverd, and there
Changes in this patch:
- Move channel variables into a new structure (struct srp_rdma_ch).
- cm_id and completion handler context pointer are now of type
srp_rdma_ch * insteoad of srp_target_port *.
No functionality is changed.
Signed-off-by: Bart Van Assche
---
drivers/infiniband/ulp/srp/ib_
Improve performance by using multiple RDMA/RC channels per SCSI host
for communicating with an SRP target.
Signed-off-by: Bart Van Assche
---
Documentation/ABI/stable/sysfs-driver-ib_srp | 25 +-
drivers/infiniband/ulp/srp/ib_srp.c | 337 ---
drivers/infiniband/
If a cable is pulled during LUN scanning it can happen that the
SRP rport and the SCSI host have been created but no LUNs have been
added to the SCSI host. Since multipathd only sends SCSI commands
to a SCSI target if one or more SCSI devices are present and since
there is no keepalive mechanism fo
Attempting to connect three times may be insufficient after an
initiator system that was using multiple RDMA channels tries to
relogin. Additionally, this login retry mechanism is a workaround
for particular behavior of the IB/CM. Since the srp_daemon retries
a failed login attempt anyway, remove t
The patch that adds multichannel support into the SRP initiator
driver introduces an additional call to srp_free_ch_ib(). This
patch helps to keep that later patch simple.
Signed-off-by: Bart Van Assche
---
drivers/infiniband/ulp/srp/ib_srp.c | 11 ++-
1 file changed, 6 insertions(+), 5
Low-level drivers (LLDs) need to know which hardware context has been
selected by the block layer. Hence pass this information to SCSI LLDs.
Signed-off-by: Bart Van Assche
Cc: Christoph Hellwig
---
drivers/scsi/scsi.c | 7 +--
drivers/scsi/scsi_lib.c | 4 ++--
drivers/scsi/scsi_priv
Allow a SCSI LLD to declare how many hardware queues it supports
by setting Scsi_Host.nr_hw_queues before calling scsi_add_host().
Note: it is assumed that each hardware queue has a queue depth of
shost->can_queue. In other words, the total queue depth per host
is (number of hardware queues) * (sh
[PATCH 1/8] blk-mq: Use all available hardware queues
Suppose that a system has two CPU sockets, three cores per socket,
that it does not support hyperthreading and that four hardware
queues are provided by a block driver. With the current algorithm
this will lead to the following assignment of CP
Hello,
Although the SRP protocol supports multichannel operation, although
since considerable time RDMA HCA's are available that support multiple
completion vectors and although multichannel operation yields better
performance than using a single channel, the Linux SRP initiator does
not yet
On 09/19/2014 01:35 PM, Christoph Hellwig wrote:
On Fri, Sep 19, 2014 at 08:26:29AM +0200, Hannes Reinecke wrote:
I would rather use 'scmd->tag', as this should be a straight copy
of scmd->request->tag, but we wouldn't need to reference the request
when doing so.
Yes, for now scmd->tag is corr
Hi Jens, hi Tejun,
I've seen multi-second boot stalls in one of my KVM setups during
the initial scsi scan:
[0.949892] scsi host0: Virtio SCSI HBA
[1.007864] scsi 0:0:0:0: Direct-Access QEMU QEMU HARDDISK1.1.
PQ: 0 ANSI: 5
[1.021299] scsi 0:0:1:0: Direct-Access QEMU
On Fri, Sep 19, 2014 at 08:26:29AM +0200, Hannes Reinecke wrote:
> I would rather use 'scmd->tag', as this should be a straight copy
> of scmd->request->tag, but we wouldn't need to reference the request
> when doing so.
Yes, for now scmd->tag is correct as drivers might not be using the
block lev
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