* [PATCH V2] nvme: set non-mdts limits in nvme_scan_work
@ 2022-05-18 6:49 Chaitanya Kulkarni
2022-05-18 8:56 ` Christoph Hellwig
0 siblings, 1 reply; 5+ messages in thread
From: Chaitanya Kulkarni @ 2022-05-18 6:49 UTC (permalink / raw)
To: hch, kbusch, sagi, james.smart; +Cc: linux-nvme, Chaitanya Kulkarni
In current implementation we set the non-mdts limits by calling
nvme_init_non_mdts_limits() from nvme_init_ctrl_finish().
This also tries to set the limits for the discovery controller which
has no I/O queues resulting in the warning message reported by the
nvme_log_error() when running blktest nvme/002: -
[ 2005.155946] run blktests nvme/002 at 2022-04-09 16:57:47
[ 2005.192223] loop: module loaded
[ 2005.196429] nvmet: adding nsid 1 to subsystem blktests-subsystem-0
[ 2005.200334] nvmet: adding nsid 1 to subsystem blktests-subsystem-1
<------------------------------SNIP---------------------------------->
[ 2008.958108] nvmet: adding nsid 1 to subsystem blktests-subsystem-997
[ 2008.962082] nvmet: adding nsid 1 to subsystem blktests-subsystem-998
[ 2008.966102] nvmet: adding nsid 1 to subsystem blktests-subsystem-999
[ 2008.973132] nvmet: creating discovery controller 1 for subsystem nqn.2014-08.org.nvmexpress.discovery for NQN testhostnqn.
*[ 2008.973196] nvme1: Identify(0x6), Invalid Field in Command (sct 0x0 / sc 0x2) MORE DNR*
[ 2008.974595] nvme nvme1: new ctrl: "nqn.2014-08.org.nvmexpress.discovery"
[ 2009.103248] nvme nvme1: Removing ctrl: NQN "nqn.2014-08.org.nvmexpress.discovery"
Move the call of nvme_init_non_mdts_limits() to nvme_scan_work() after
we verify that I/O queues are created since that is a converging point
for each transport where these limits are actually used.
1. FC :
nvme_fc_create_association()
...
nvme_fc_create_io_queues()
...
nvme_start_ctrl()
nvme_scan_queue()
nvme_scan_work()
2. PCIe:-
nvme_reset_work()
...
nvme_setup_io_queues()
nvme_create_io_queues()
nvme_alloc_queue()
...
nvme_start_ctrl()
nvme_scan_queue()
nvme_scan_work()
3. RDMA :-
nvme_rdma_setup_ctrl()
...
nvme_rdma_configure_io_queues()
...
nvme_start_ctrl()
nvme_scan_queue()
nvme_scan_work()
4. TCP :-
nvme_tcp_setup_ctrl()
...
nvme_tcp_configure_io_queues()
...
nvme_start_ctrl()
nvme_scan_queue()
nvme_scan_work()
* nvme_scan_work()
...
nvme_validate_or_alloc_ns()
nvme_alloc_ns()
nvme_update_ns_info()
nvme_update_disk_info()
nvme_config_discard() <---
blk_queue_max_write_zeroes_sectors() <---
Signed-off-by: Chaitanya Kulkarni <kch@nvidia.com>
---
* changes from V1:-
1. Instead of duplicating the call for nvme_init_non_mdts_limits()
move it to the nvme_scan_work().
---
drivers/nvme/host/core.c | 12 ++++++++----
1 file changed, 8 insertions(+), 4 deletions(-)
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 42f9772abc4d..8cbd70606f09 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -3082,10 +3082,6 @@ int nvme_init_ctrl_finish(struct nvme_ctrl *ctrl)
if (ret)
return ret;
- ret = nvme_init_non_mdts_limits(ctrl);
- if (ret < 0)
- return ret;
-
ret = nvme_configure_apst(ctrl);
if (ret < 0)
return ret;
@@ -4239,11 +4235,19 @@ static void nvme_scan_work(struct work_struct *work)
{
struct nvme_ctrl *ctrl =
container_of(work, struct nvme_ctrl, scan_work);
+ int ret;
/* No tagset on a live ctrl means IO queues could not created */
if (ctrl->state != NVME_CTRL_LIVE || !ctrl->tagset)
return;
+ ret = nvme_init_non_mdts_limits(ctrl);
+ if (ret < 0) {
+ dev_warn(ctrl->device,
+ "reading non-mdts-limits failed: %d\n", ret);
+ return;
+ }
+
if (test_and_clear_bit(NVME_AER_NOTICE_NS_CHANGED, &ctrl->events)) {
dev_info(ctrl->device, "rescanning namespaces.\n");
nvme_clear_changed_ns_log(ctrl);
--
2.29.0
^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH V2] nvme: set non-mdts limits in nvme_scan_work
2022-05-18 6:49 [PATCH V2] nvme: set non-mdts limits in nvme_scan_work Chaitanya Kulkarni
@ 2022-05-18 8:56 ` Christoph Hellwig
2022-05-18 14:42 ` Keith Busch
0 siblings, 1 reply; 5+ messages in thread
From: Christoph Hellwig @ 2022-05-18 8:56 UTC (permalink / raw)
To: Chaitanya Kulkarni; +Cc: hch, kbusch, sagi, james.smart, linux-nvme
This re-reads the limits everytime a namespace is added or deleted,
is that really such a good idea?
On Tue, May 17, 2022 at 11:49:44PM -0700, Chaitanya Kulkarni wrote:
> In current implementation we set the non-mdts limits by calling
> nvme_init_non_mdts_limits() from nvme_init_ctrl_finish().
> This also tries to set the limits for the discovery controller which
> has no I/O queues resulting in the warning message reported by the
> nvme_log_error() when running blktest nvme/002: -
>
> [ 2005.155946] run blktests nvme/002 at 2022-04-09 16:57:47
> [ 2005.192223] loop: module loaded
> [ 2005.196429] nvmet: adding nsid 1 to subsystem blktests-subsystem-0
> [ 2005.200334] nvmet: adding nsid 1 to subsystem blktests-subsystem-1
>
> <------------------------------SNIP---------------------------------->
>
> [ 2008.958108] nvmet: adding nsid 1 to subsystem blktests-subsystem-997
> [ 2008.962082] nvmet: adding nsid 1 to subsystem blktests-subsystem-998
> [ 2008.966102] nvmet: adding nsid 1 to subsystem blktests-subsystem-999
> [ 2008.973132] nvmet: creating discovery controller 1 for subsystem nqn.2014-08.org.nvmexpress.discovery for NQN testhostnqn.
> *[ 2008.973196] nvme1: Identify(0x6), Invalid Field in Command (sct 0x0 / sc 0x2) MORE DNR*
> [ 2008.974595] nvme nvme1: new ctrl: "nqn.2014-08.org.nvmexpress.discovery"
> [ 2009.103248] nvme nvme1: Removing ctrl: NQN "nqn.2014-08.org.nvmexpress.discovery"
>
> Move the call of nvme_init_non_mdts_limits() to nvme_scan_work() after
> we verify that I/O queues are created since that is a converging point
> for each transport where these limits are actually used.
>
> 1. FC :
> nvme_fc_create_association()
> ...
> nvme_fc_create_io_queues()
> ...
> nvme_start_ctrl()
> nvme_scan_queue()
> nvme_scan_work()
>
> 2. PCIe:-
> nvme_reset_work()
> ...
> nvme_setup_io_queues()
> nvme_create_io_queues()
> nvme_alloc_queue()
> ...
> nvme_start_ctrl()
> nvme_scan_queue()
> nvme_scan_work()
>
> 3. RDMA :-
> nvme_rdma_setup_ctrl()
> ...
> nvme_rdma_configure_io_queues()
> ...
> nvme_start_ctrl()
> nvme_scan_queue()
> nvme_scan_work()
>
> 4. TCP :-
> nvme_tcp_setup_ctrl()
> ...
> nvme_tcp_configure_io_queues()
> ...
> nvme_start_ctrl()
> nvme_scan_queue()
> nvme_scan_work()
>
> * nvme_scan_work()
> ...
> nvme_validate_or_alloc_ns()
> nvme_alloc_ns()
> nvme_update_ns_info()
> nvme_update_disk_info()
> nvme_config_discard() <---
> blk_queue_max_write_zeroes_sectors() <---
>
> Signed-off-by: Chaitanya Kulkarni <kch@nvidia.com>
> ---
> * changes from V1:-
>
> 1. Instead of duplicating the call for nvme_init_non_mdts_limits()
> move it to the nvme_scan_work().
>
> ---
> drivers/nvme/host/core.c | 12 ++++++++----
> 1 file changed, 8 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
> index 42f9772abc4d..8cbd70606f09 100644
> --- a/drivers/nvme/host/core.c
> +++ b/drivers/nvme/host/core.c
> @@ -3082,10 +3082,6 @@ int nvme_init_ctrl_finish(struct nvme_ctrl *ctrl)
> if (ret)
> return ret;
>
> - ret = nvme_init_non_mdts_limits(ctrl);
> - if (ret < 0)
> - return ret;
> -
> ret = nvme_configure_apst(ctrl);
> if (ret < 0)
> return ret;
> @@ -4239,11 +4235,19 @@ static void nvme_scan_work(struct work_struct *work)
> {
> struct nvme_ctrl *ctrl =
> container_of(work, struct nvme_ctrl, scan_work);
> + int ret;
>
> /* No tagset on a live ctrl means IO queues could not created */
> if (ctrl->state != NVME_CTRL_LIVE || !ctrl->tagset)
> return;
>
> + ret = nvme_init_non_mdts_limits(ctrl);
> + if (ret < 0) {
> + dev_warn(ctrl->device,
> + "reading non-mdts-limits failed: %d\n", ret);
> + return;
> + }
> +
> if (test_and_clear_bit(NVME_AER_NOTICE_NS_CHANGED, &ctrl->events)) {
> dev_info(ctrl->device, "rescanning namespaces.\n");
> nvme_clear_changed_ns_log(ctrl);
> --
> 2.29.0
---end quoted text---
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH V2] nvme: set non-mdts limits in nvme_scan_work
2022-05-18 8:56 ` Christoph Hellwig
@ 2022-05-18 14:42 ` Keith Busch
2022-05-18 14:51 ` Christoph Hellwig
0 siblings, 1 reply; 5+ messages in thread
From: Keith Busch @ 2022-05-18 14:42 UTC (permalink / raw)
To: Christoph Hellwig; +Cc: Chaitanya Kulkarni, sagi, james.smart, linux-nvme
On Wed, May 18, 2022 at 10:56:02AM +0200, Christoph Hellwig wrote:
> This re-reads the limits everytime a namespace is added or deleted,
> is that really such a good idea?
The limits are reported in logical blocks, which is dependent on the formats
that attached namespaces have.
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH V2] nvme: set non-mdts limits in nvme_scan_work
2022-05-18 14:42 ` Keith Busch
@ 2022-05-18 14:51 ` Christoph Hellwig
2022-05-18 15:52 ` Chaitanya Kulkarni
0 siblings, 1 reply; 5+ messages in thread
From: Christoph Hellwig @ 2022-05-18 14:51 UTC (permalink / raw)
To: Keith Busch
Cc: Christoph Hellwig, Chaitanya Kulkarni, sagi, james.smart, linux-nvme
On Wed, May 18, 2022 at 08:42:02AM -0600, Keith Busch wrote:
> On Wed, May 18, 2022 at 10:56:02AM +0200, Christoph Hellwig wrote:
> > This re-reads the limits everytime a namespace is added or deleted,
> > is that really such a good idea?
>
> The limits are reported in logical blocks, which is dependent on the formats
> that attached namespaces have.
Well, the Identify controller limits aren't really supposed to
change randomly. But ok, maybe that is a reason to frequently
rescan due work around this broken design. Can we add a comment
to explain that?
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH V2] nvme: set non-mdts limits in nvme_scan_work
2022-05-18 14:51 ` Christoph Hellwig
@ 2022-05-18 15:52 ` Chaitanya Kulkarni
0 siblings, 0 replies; 5+ messages in thread
From: Chaitanya Kulkarni @ 2022-05-18 15:52 UTC (permalink / raw)
To: Christoph Hellwig, Keith Busch
Cc: Chaitanya Kulkarni, sagi, james.smart, linux-nvme
On 5/18/22 07:51, Christoph Hellwig wrote:
> On Wed, May 18, 2022 at 08:42:02AM -0600, Keith Busch wrote:
>> On Wed, May 18, 2022 at 10:56:02AM +0200, Christoph Hellwig wrote:
>>> This re-reads the limits everytime a namespace is added or deleted,
>>> is that really such a good idea?
>>
>> The limits are reported in logical blocks, which is dependent on the formats
>> that attached namespaces have.
>
> Well, the Identify controller limits aren't really supposed to
> change randomly. But ok, maybe that is a reason to frequently
> rescan due work around this broken design. Can we add a comment
> to explain that?
sent out V3 with added comment.
-ck
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2022-05-18 15:52 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
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2022-05-18 6:49 [PATCH V2] nvme: set non-mdts limits in nvme_scan_work Chaitanya Kulkarni
2022-05-18 8:56 ` Christoph Hellwig
2022-05-18 14:42 ` Keith Busch
2022-05-18 14:51 ` Christoph Hellwig
2022-05-18 15:52 ` Chaitanya Kulkarni
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