* RE: [PATCH] [net-next] net: hns3: add IOMMU_SUPPORT dependency
2024-11-04 10:29 ` Robin Murphy
@ 2024-11-04 10:40 ` Salil Mehta
2024-11-04 10:50 ` Salil Mehta
2024-11-04 12:01 ` Pranjal Shrivastava
2024-11-05 2:10 ` Jakub Kicinski
2 siblings, 1 reply; 8+ messages in thread
From: Salil Mehta @ 2024-11-04 10:40 UTC (permalink / raw)
To: Robin Murphy, Arnd Bergmann, shenjian (K)
Cc: Arnd Bergmann, Will Deacon, Joerg Roedel, iommu@lists.linux.dev,
Andrew Lunn, David S. Miller, Eric Dumazet, Jakub Kicinski,
Paolo Abeni, shaojijie, wangpeiyang, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org
HI Robin,
> From: Robin Murphy <robin.murphy@arm.com>
> Sent: Monday, November 4, 2024 10:29 AM
> To: Arnd Bergmann <arnd@kernel.org>; shenjian (K)
> <shenjian15@huawei.com>; Salil Mehta <salil.mehta@huawei.com>
> Cc: Arnd Bergmann <arnd@arndb.de>; Will Deacon <will@kernel.org>;
> Joerg Roedel <jroedel@suse.de>; iommu@lists.linux.dev; Andrew Lunn
> <andrew+netdev@lunn.ch>; David S. Miller <davem@davemloft.net>; Eric
> Dumazet <edumazet@google.com>; Jakub Kicinski <kuba@kernel.org>;
> Paolo Abeni <pabeni@redhat.com>; shaojijie <shaojijie@huawei.com>;
> wangpeiyang <wangpeiyang1@huawei.com>; netdev@vger.kernel.org;
> linux-kernel@vger.kernel.org
> Subject: Re: [PATCH] [net-next] net: hns3: add IOMMU_SUPPORT
> dependency
>
> On 2024-11-04 8:21 am, Arnd Bergmann wrote:
> > From: Arnd Bergmann <arnd@arndb.de>
> >
> > The hns3 driver started filling iommu_iotlb_gather structures itself,
> > which requires CONFIG_IOMMU_SUPPORT is enabled:
> >
> > drivers/net/ethernet/hisilicon/hns3/hns3_enet.c: In function
> 'hns3_dma_map_sync':
> > drivers/net/ethernet/hisilicon/hns3/hns3_enet.c:395:14: error: 'struct
> iommu_iotlb_gather' has no member named 'start'
> > 395 | iotlb_gather.start = iova;
> > | ^
> > drivers/net/ethernet/hisilicon/hns3/hns3_enet.c:396:14: error: 'struct
> iommu_iotlb_gather' has no member named 'end'
> > 396 | iotlb_gather.end = iova + granule - 1;
> > | ^
> > drivers/net/ethernet/hisilicon/hns3/hns3_enet.c:397:14: error: 'struct
> iommu_iotlb_gather' has no member named 'pgsize'
> > 397 | iotlb_gather.pgsize = granule;
> > | ^
> >
> > Add a Kconfig dependency to make it build in random configurations.
> >
> > Cc: Will Deacon <will@kernel.org>
> > Cc: Joerg Roedel <jroedel@suse.de>
> > Cc: Robin Murphy <robin.murphy@arm.com>
> > Cc: iommu@lists.linux.dev
> > Fixes: f2c14899caba ("net: hns3: add sync command to sync io-pgtable")
> > Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> > ---
> > I noticed that no other driver does this, so it would be good to have
> > a confirmation from the iommu maintainers that this is how the
> > interface and the dependency is intended to be used.
>
> WTF is that patch doing!? No, random device drivers should absolutely not
> be poking into IOMMU driver internals, this is egregiously wrong and the
> correct action is to drop it entirely.
Absolutely agree with it. Sorry I haven't been in touch for quite some time. Let
me catch the whole story. Feel free to drop this patch.
Thanks
Salil.
>
> Thanks,
> Robin.
>
> > ---
> > drivers/net/ethernet/hisilicon/Kconfig | 1 +
> > 1 file changed, 1 insertion(+)
> >
> > diff --git a/drivers/net/ethernet/hisilicon/Kconfig
> > b/drivers/net/ethernet/hisilicon/Kconfig
> > index 65302c41bfb1..790efc8d2de6 100644
> > --- a/drivers/net/ethernet/hisilicon/Kconfig
> > +++ b/drivers/net/ethernet/hisilicon/Kconfig
> > @@ -91,6 +91,7 @@ config HNS_ENET
> > config HNS3
> > tristate "Hisilicon Network Subsystem Support HNS3 (Framework)"
> > depends on PCI
> > + depends on IOMMU_SUPPORT
> > select NET_DEVLINK
> > select PAGE_POOL
> > help
>
^ permalink raw reply [flat|nested] 8+ messages in thread* RE: [PATCH] [net-next] net: hns3: add IOMMU_SUPPORT dependency
2024-11-04 10:40 ` Salil Mehta
@ 2024-11-04 10:50 ` Salil Mehta
2024-11-04 16:34 ` Robin Murphy
0 siblings, 1 reply; 8+ messages in thread
From: Salil Mehta @ 2024-11-04 10:50 UTC (permalink / raw)
To: Salil Mehta, Robin Murphy, Arnd Bergmann, shenjian (K)
Cc: Arnd Bergmann, Will Deacon, Joerg Roedel, iommu@lists.linux.dev,
Andrew Lunn, David S. Miller, Eric Dumazet, Jakub Kicinski,
Paolo Abeni, shaojijie, wangpeiyang, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org
> From: Salil Mehta <salil.mehta@huawei.com>
> Sent: Monday, November 4, 2024 10:41 AM
> To: Robin Murphy <robin.murphy@arm.com>; Arnd Bergmann
> <arnd@kernel.org>; shenjian (K) <shenjian15@huawei.com>
>
> HI Robin,
>
> > From: Robin Murphy <robin.murphy@arm.com>
> > Sent: Monday, November 4, 2024 10:29 AM
> > To: Arnd Bergmann <arnd@kernel.org>; shenjian (K)
> > <shenjian15@huawei.com>; Salil Mehta <salil.mehta@huawei.com>
> > Cc: Arnd Bergmann <arnd@arndb.de>; Will Deacon <will@kernel.org>;
> > Joerg Roedel <jroedel@suse.de>; iommu@lists.linux.dev; Andrew Lunn
> > <andrew+netdev@lunn.ch>; David S. Miller <davem@davemloft.net>;
> Eric
> > Dumazet <edumazet@google.com>; Jakub Kicinski <kuba@kernel.org>;
> > Paolo Abeni <pabeni@redhat.com>; shaojijie <shaojijie@huawei.com>;
> > wangpeiyang <wangpeiyang1@huawei.com>; netdev@vger.kernel.org;
> > linux-kernel@vger.kernel.org
> > Subject: Re: [PATCH] [net-next] net: hns3: add IOMMU_SUPPORT
> > dependency
> >
> > On 2024-11-04 8:21 am, Arnd Bergmann wrote:
> > > From: Arnd Bergmann <arnd@arndb.de> > > The hns3 driver started
> > filling iommu_iotlb_gather structures itself, > which requires
> > CONFIG_IOMMU_SUPPORT is enabled:
> > >
> > > drivers/net/ethernet/hisilicon/hns3/hns3_enet.c: In function
> > 'hns3_dma_map_sync':
> > > drivers/net/ethernet/hisilicon/hns3/hns3_enet.c:395:14: error:
> > 'struct iommu_iotlb_gather' has no member named 'start'
> > > 395 | iotlb_gather.start = iova;
> > > | ^
> > > drivers/net/ethernet/hisilicon/hns3/hns3_enet.c:396:14: error:
> > 'struct iommu_iotlb_gather' has no member named 'end'
> > > 396 | iotlb_gather.end = iova + granule - 1;
> > > | ^
> > > drivers/net/ethernet/hisilicon/hns3/hns3_enet.c:397:14: error:
> > 'struct iommu_iotlb_gather' has no member named 'pgsize'
> > > 397 | iotlb_gather.pgsize = granule;
> > > | ^
> > >
> > > Add a Kconfig dependency to make it build in random configurations.
> > >
> > > Cc: Will Deacon <will@kernel.org>
> > > Cc: Joerg Roedel <jroedel@suse.de>
> > > Cc: Robin Murphy <robin.murphy@arm.com> > Cc:
> > iommu@lists.linux.dev > Fixes: f2c14899caba ("net: hns3: add sync
> > command to sync io-pgtable") > Signed-off-by: Arnd Bergmann
> > <arnd@arndb.de> > --- > I noticed that no other driver does this, so
> > it would be good to have > a confirmation from the iommu maintainers
> > that this is how the > interface and the dependency is intended to be
> > used.
> >
> > WTF is that patch doing!? No, random device drivers should absolutely
> > not be poking into IOMMU driver internals, this is egregiously wrong
> > and the correct action is to drop it entirely.
>
>
> Absolutely agree with it. Sorry I haven't been in touch for quite some time.
> Let me catch the whole story. Feel free to drop this patch.
Just to make it clear I meant the culprit patch:
https://lore.kernel.org/netdev/20241025092938.2912958-3-shaojijie@huawei.com/
>
> Thanks
> Salil.
>
> >
> > Thanks,
> > Robin.
> >
> > > ---
> > > drivers/net/ethernet/hisilicon/Kconfig | 1 +
> > > 1 file changed, 1 insertion(+)
> > >
> > > diff --git a/drivers/net/ethernet/hisilicon/Kconfig
> > > b/drivers/net/ethernet/hisilicon/Kconfig
> > > index 65302c41bfb1..790efc8d2de6 100644 > ---
> > a/drivers/net/ethernet/hisilicon/Kconfig
> > > +++ b/drivers/net/ethernet/hisilicon/Kconfig
> > > @@ -91,6 +91,7 @@ config HNS_ENET
> > > config HNS3
> > > tristate "Hisilicon Network Subsystem Support HNS3 (Framework)"
> > > depends on PCI
> > > + depends on IOMMU_SUPPORT
> > > select NET_DEVLINK
> > > select PAGE_POOL
> > > help
> >
^ permalink raw reply [flat|nested] 8+ messages in thread* Re: [PATCH] [net-next] net: hns3: add IOMMU_SUPPORT dependency
2024-11-04 10:50 ` Salil Mehta
@ 2024-11-04 16:34 ` Robin Murphy
2024-11-06 19:39 ` Salil Mehta
0 siblings, 1 reply; 8+ messages in thread
From: Robin Murphy @ 2024-11-04 16:34 UTC (permalink / raw)
To: Salil Mehta, Arnd Bergmann, shenjian (K)
Cc: Arnd Bergmann, Will Deacon, Joerg Roedel, iommu@lists.linux.dev,
Andrew Lunn, David S. Miller, Eric Dumazet, Jakub Kicinski,
Paolo Abeni, shaojijie, wangpeiyang, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org
On 2024-11-04 10:50 am, Salil Mehta wrote:
>> From: Salil Mehta <salil.mehta@huawei.com>
>> Sent: Monday, November 4, 2024 10:41 AM
>> To: Robin Murphy <robin.murphy@arm.com>; Arnd Bergmann
>> <arnd@kernel.org>; shenjian (K) <shenjian15@huawei.com>
>>
>> HI Robin,
>>
>> > From: Robin Murphy <robin.murphy@arm.com>
>> > Sent: Monday, November 4, 2024 10:29 AM
>> > To: Arnd Bergmann <arnd@kernel.org>; shenjian (K)
>> > <shenjian15@huawei.com>; Salil Mehta <salil.mehta@huawei.com>
>> > Cc: Arnd Bergmann <arnd@arndb.de>; Will Deacon <will@kernel.org>;
>> > Joerg Roedel <jroedel@suse.de>; iommu@lists.linux.dev; Andrew Lunn
>> > <andrew+netdev@lunn.ch>; David S. Miller <davem@davemloft.net>;
>> Eric
>> > Dumazet <edumazet@google.com>; Jakub Kicinski <kuba@kernel.org>;
>> > Paolo Abeni <pabeni@redhat.com>; shaojijie <shaojijie@huawei.com>;
>> > wangpeiyang <wangpeiyang1@huawei.com>; netdev@vger.kernel.org;
>> > linux-kernel@vger.kernel.org
>> > Subject: Re: [PATCH] [net-next] net: hns3: add IOMMU_SUPPORT
>> > dependency
>> >
>> > On 2024-11-04 8:21 am, Arnd Bergmann wrote:
>> > > From: Arnd Bergmann <arnd@arndb.de> > > The hns3 driver started
>> > filling iommu_iotlb_gather structures itself, > which requires
>> > CONFIG_IOMMU_SUPPORT is enabled:
>> > >
>> > > drivers/net/ethernet/hisilicon/hns3/hns3_enet.c: In function
>> > 'hns3_dma_map_sync':
>> > > drivers/net/ethernet/hisilicon/hns3/hns3_enet.c:395:14: error:
>> > 'struct iommu_iotlb_gather' has no member named 'start'
>> > > 395 | iotlb_gather.start = iova;
>> > > | ^
>> > > drivers/net/ethernet/hisilicon/hns3/hns3_enet.c:396:14: error:
>> > 'struct iommu_iotlb_gather' has no member named 'end'
>> > > 396 | iotlb_gather.end = iova + granule - 1;
>> > > | ^
>> > > drivers/net/ethernet/hisilicon/hns3/hns3_enet.c:397:14: error:
>> > 'struct iommu_iotlb_gather' has no member named 'pgsize'
>> > > 397 | iotlb_gather.pgsize = granule;
>> > > | ^
>> > >
>> > > Add a Kconfig dependency to make it build in random configurations.
>> > >
>> > > Cc: Will Deacon <will@kernel.org>
>> > > Cc: Joerg Roedel <jroedel@suse.de>
>> > > Cc: Robin Murphy <robin.murphy@arm.com> > Cc:
>> > iommu@lists.linux.dev > Fixes: f2c14899caba ("net: hns3: add sync
>> > command to sync io-pgtable") > Signed-off-by: Arnd Bergmann
>> > <arnd@arndb.de> > --- > I noticed that no other driver does this, so
>> > it would be good to have > a confirmation from the iommu maintainers
>> > that this is how the > interface and the dependency is intended to be
>> > used.
>> >
>> > WTF is that patch doing!? No, random device drivers should absolutely
>> > not be poking into IOMMU driver internals, this is egregiously wrong
>> > and the correct action is to drop it entirely.
>>
>>
>> Absolutely agree with it. Sorry I haven't been in touch for quite some time.
>> Let me catch the whole story. Feel free to drop this patch.
>
>
> Just to make it clear I meant the culprit patch:
> https://lore.kernel.org/netdev/20241025092938.2912958-3-shaojijie@huawei.com/
Right, if the HIP09 SMMU has a bug which requires an
iommu_domain_ops::iotlb_sync_map workaround, then the SMMU driver should
detect the HIP09 SMMU and implement that workaround for it. HNS3 trying
to reach in to the SMMU driver's data and open-code iotlb_sync_map on
its behalf is just as plain illogical as it is unacceptable.
Thanks,
Robin.
^ permalink raw reply [flat|nested] 8+ messages in thread* RE: [PATCH] [net-next] net: hns3: add IOMMU_SUPPORT dependency
2024-11-04 16:34 ` Robin Murphy
@ 2024-11-06 19:39 ` Salil Mehta
0 siblings, 0 replies; 8+ messages in thread
From: Salil Mehta @ 2024-11-06 19:39 UTC (permalink / raw)
To: Robin Murphy, Arnd Bergmann, shenjian (K)
Cc: Arnd Bergmann, Will Deacon, Joerg Roedel, iommu@lists.linux.dev,
Andrew Lunn, David S. Miller, Eric Dumazet, Jakub Kicinski,
Paolo Abeni, shaojijie, wangpeiyang, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org
Hi Robin,
Sorry for the late reply. I was on a leave yesterday.
> From: Robin Murphy <robin.murphy@arm.com>
> Sent: Monday, November 4, 2024 4:35 PM
> To: Salil Mehta <salil.mehta@huawei.com>; Arnd Bergmann
> <arnd@kernel.org>; shenjian (K) <shenjian15@huawei.com>
>
> On 2024-11-04 10:50 am, Salil Mehta wrote:
> >> From: Salil Mehta <salil.mehta@huawei.com>
> >> Sent: Monday, November 4, 2024 10:41 AM
> >> To: Robin Murphy <robin.murphy@arm.com>; Arnd Bergmann
> >> <arnd@kernel.org>; shenjian (K) <shenjian15@huawei.com>
> >>
> >> HI Robin,
> >>
> >> > From: Robin Murphy <robin.murphy@arm.com>
> >> > Sent: Monday, November 4, 2024 10:29 AM
> >> > To: Arnd Bergmann <arnd@kernel.org>; shenjian (K)
> >> > <shenjian15@huawei.com>; Salil Mehta <salil.mehta@huawei.com>
> >> > Cc: Arnd Bergmann <arnd@arndb.de>; Will Deacon
> <will@kernel.org>;
> >> > Joerg Roedel <jroedel@suse.de>; iommu@lists.linux.dev; Andrew
> Lunn
> >> > <andrew+netdev@lunn.ch>; David S. Miller
> <davem@davemloft.net>;
> >> Eric
> >> > Dumazet <edumazet@google.com>; Jakub Kicinski
> <kuba@kernel.org>;
> >> > Paolo Abeni <pabeni@redhat.com>; shaojijie
> <shaojijie@huawei.com>;
> >> > wangpeiyang <wangpeiyang1@huawei.com>;
> netdev@vger.kernel.org;
> >> > linux-kernel@vger.kernel.org
> >> > Subject: Re: [PATCH] [net-next] net: hns3: add IOMMU_SUPPORT
> >> > dependency
> >> >
> >> > On 2024-11-04 8:21 am, Arnd Bergmann wrote:
> >> > > From: Arnd Bergmann <arnd@arndb.de> > > The hns3 driver
> started
> >> > filling iommu_iotlb_gather structures itself, > which requires
> >> > CONFIG_IOMMU_SUPPORT is enabled:
> >> > >
> >> > > drivers/net/ethernet/hisilicon/hns3/hns3_enet.c: In function
> >> > 'hns3_dma_map_sync':
> >> > > drivers/net/ethernet/hisilicon/hns3/hns3_enet.c:395:14: error:
> >> > 'struct iommu_iotlb_gather' has no member named 'start'
> >> > > 395 | iotlb_gather.start = iova;
> >> > > | ^
> >> > > drivers/net/ethernet/hisilicon/hns3/hns3_enet.c:396:14: error:
> >> > 'struct iommu_iotlb_gather' has no member named 'end'
> >> > > 396 | iotlb_gather.end = iova + granule - 1;
> >> > > | ^
> >> > > drivers/net/ethernet/hisilicon/hns3/hns3_enet.c:397:14: error:
> >> > 'struct iommu_iotlb_gather' has no member named 'pgsize'
> >> > > 397 | iotlb_gather.pgsize = granule;
> >> > > | ^
> >> > >
> >> > > Add a Kconfig dependency to make it build in random
> configurations.
> >> > >
> >> > > Cc: Will Deacon <will@kernel.org>
> >> > > Cc: Joerg Roedel <jroedel@suse.de>
> >> > > Cc: Robin Murphy <robin.murphy@arm.com> > Cc:
> >> > iommu@lists.linux.dev > Fixes: f2c14899caba ("net: hns3: add sync
> >> > command to sync io-pgtable") > Signed-off-by: Arnd Bergmann
> >> > <arnd@arndb.de> > --- > I noticed that no other driver does this, so
> >> > it would be good to have > a confirmation from the iommu
> maintainers
> >> > that this is how the > interface and the dependency is intended to be
> >> > used.
> >> >
> >> > WTF is that patch doing!? No, random device drivers should
> absolutely
> >> > not be poking into IOMMU driver internals, this is egregiously wrong
> >> > and the correct action is to drop it entirely.
> >>
> >>
> >> Absolutely agree with it. Sorry I haven't been in touch for quite some
> time.
> >> Let me catch the whole story. Feel free to drop this patch.
> >
> >
> > Just to make it clear I meant the culprit patch:
> > https://lore.kernel.org/netdev/20241025092938.2912958-3-
> shaojijie@huaw
> > ei.com/
>
> Right, if the HIP09 SMMU has a bug which requires an
> iommu_domain_ops::iotlb_sync_map workaround, then the SMMU driver
> should detect the HIP09 SMMU and implement that workaround for it.
> HNS3 trying to reach in to the SMMU driver's data and open-code
> iotlb_sync_map on its behalf is just as plain illogical as it is unacceptable.
Totally agree with that. It breaks the design of the kernel fundamentally.
This was a mistake and on Monday I've requested the stakeholders to
address it exactly in the realms of what you have suggested above.
Rest assured, we will address that in the correct way. Sorry, if this caused
any inconvenience to anymore including the MAINTAINER of `netdev`
I would have caught this much earlier had I been following the ML closely
but unfortunately I've not been in touch for long.
Thanks for the `nudge` though 😊
Cheers
Salil.
>
> Thanks,
> Robin.
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCH] [net-next] net: hns3: add IOMMU_SUPPORT dependency
2024-11-04 10:29 ` Robin Murphy
2024-11-04 10:40 ` Salil Mehta
@ 2024-11-04 12:01 ` Pranjal Shrivastava
2024-11-05 2:10 ` Jakub Kicinski
2 siblings, 0 replies; 8+ messages in thread
From: Pranjal Shrivastava @ 2024-11-04 12:01 UTC (permalink / raw)
To: Robin Murphy
Cc: Arnd Bergmann, Jian Shen, Salil Mehta, Arnd Bergmann, Will Deacon,
Joerg Roedel, iommu, Andrew Lunn, David S. Miller, Eric Dumazet,
Jakub Kicinski, Paolo Abeni, Jijie Shao, Peiyang Wang, netdev,
linux-kernel
On Mon, Nov 04, 2024 at 10:29:28AM +0000, Robin Murphy wrote:
> On 2024-11-04 8:21 am, Arnd Bergmann wrote:
> > From: Arnd Bergmann <arnd@arndb.de>
> >
> > The hns3 driver started filling iommu_iotlb_gather structures itself,
> > which requires CONFIG_IOMMU_SUPPORT is enabled:
> >
> > drivers/net/ethernet/hisilicon/hns3/hns3_enet.c: In function 'hns3_dma_map_sync':
> > drivers/net/ethernet/hisilicon/hns3/hns3_enet.c:395:14: error: 'struct iommu_iotlb_gather' has no member named 'start'
> > 395 | iotlb_gather.start = iova;
> > | ^
> > drivers/net/ethernet/hisilicon/hns3/hns3_enet.c:396:14: error: 'struct iommu_iotlb_gather' has no member named 'end'
> > 396 | iotlb_gather.end = iova + granule - 1;
> > | ^
> > drivers/net/ethernet/hisilicon/hns3/hns3_enet.c:397:14: error: 'struct iommu_iotlb_gather' has no member named 'pgsize'
> > 397 | iotlb_gather.pgsize = granule;
> > | ^
> >
> > Add a Kconfig dependency to make it build in random configurations.
> >
> > Cc: Will Deacon <will@kernel.org>
> > Cc: Joerg Roedel <jroedel@suse.de>
> > Cc: Robin Murphy <robin.murphy@arm.com>
> > Cc: iommu@lists.linux.dev
> > Fixes: f2c14899caba ("net: hns3: add sync command to sync io-pgtable")
> > Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> > ---
> > I noticed that no other driver does this, so it would be good to
> > have a confirmation from the iommu maintainers that this is how
> > the interface and the dependency is intended to be used.
>
> WTF is that patch doing!? No, random device drivers should absolutely not be
> poking into IOMMU driver internals, this is egregiously wrong and the
> correct action is to drop it entirely.
+1. Device drivers shouldn't poke into IOMMU internals.
>
> Thanks,
> Robin.
I see that the requirement in [1] is to somehow flush / sync the iotlb
right after dma mapping an address as a work around for a HW bug, right?
I'd like to point out that the dma_map* API take care of this if the
underlying iommu implements the `iotlb_sync_map` op (check iommu_map).
Thus, in case you require it and your iommu driver does NOT support
`iotlb_sync_map`, the right way would be to add this functionality to
*that* iommu driver instead of letting the device driver poke into IOMMU
Another thing worth noting is, we do have some quirks to address broken
hardware in the iommu drivers. For example, a broken pre-fetch command
for hisilicon HI161x in arm-smmu-v3 driver[2]. Such options can be added
to iommu drivers after discussion with the relevant stakeholders.
Thanks,
Praan
[1]
https://lore.kernel.org/netdev/20241025092938.2912958-2-shaojijie@huawei.com/
[2]
https://elixir.bootlin.com/linux/v6.11.6/source/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c#L81
>
> > ---
> > drivers/net/ethernet/hisilicon/Kconfig | 1 +
> > 1 file changed, 1 insertion(+)
> >
> > diff --git a/drivers/net/ethernet/hisilicon/Kconfig b/drivers/net/ethernet/hisilicon/Kconfig
> > index 65302c41bfb1..790efc8d2de6 100644
> > --- a/drivers/net/ethernet/hisilicon/Kconfig
> > +++ b/drivers/net/ethernet/hisilicon/Kconfig
> > @@ -91,6 +91,7 @@ config HNS_ENET
> > config HNS3
> > tristate "Hisilicon Network Subsystem Support HNS3 (Framework)"
> > depends on PCI
> > + depends on IOMMU_SUPPORT
> > select NET_DEVLINK
> > select PAGE_POOL
> > help
>
>
^ permalink raw reply [flat|nested] 8+ messages in thread* Re: [PATCH] [net-next] net: hns3: add IOMMU_SUPPORT dependency
2024-11-04 10:29 ` Robin Murphy
2024-11-04 10:40 ` Salil Mehta
2024-11-04 12:01 ` Pranjal Shrivastava
@ 2024-11-05 2:10 ` Jakub Kicinski
2 siblings, 0 replies; 8+ messages in thread
From: Jakub Kicinski @ 2024-11-05 2:10 UTC (permalink / raw)
To: Robin Murphy
Cc: Arnd Bergmann, Jian Shen, Salil Mehta, Arnd Bergmann, Will Deacon,
Joerg Roedel, iommu, Andrew Lunn, David S. Miller, Eric Dumazet,
Paolo Abeni, Jijie Shao, Peiyang Wang, netdev, linux-kernel
On Mon, 4 Nov 2024 10:29:28 +0000 Robin Murphy wrote:
> WTF is that patch doing!? No, random device drivers should absolutely
> not be poking into IOMMU driver internals, this is egregiously wrong and
> the correct action is to drop it entirely.
Sorry, reverted in
https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=249cfa318fb1b77eb726c2ff4f74c9685f04e568
^ permalink raw reply [flat|nested] 8+ messages in thread