From: Ferruh Yigit <ferruh.yigit@intel.com>
To: Neil Horman <nhorman@tuxdriver.com>,
Olivier Matz <olivier.matz@6wind.com>
Cc: Stephen Hemminger <stephen@networkplumber.org>,
dev@dpdk.org, thomas.monjalon@6wind.com, vido@cesnet.cz,
fiona.trahe@intel.com, adrien.mazarguil@6wind.com
Subject: Re: [dpdk-dev] [PATCH v3] drivers: advertise kmod dependencies in pmdinfo
Date: Fri, 16 Dec 2016 14:19:59 +0000 [thread overview]
Message-ID: <ead3cf82-9108-69a4-0fd7-ee3babbb178c@intel.com> (raw)
In-Reply-To: <20161216123738.GA2255@hmsreliant.think-freely.org>
On 12/16/2016 12:37 PM, Neil Horman wrote:
> On Fri, Dec 16, 2016 at 10:22:08AM +0100, Olivier Matz wrote:
>> Hi,
>>
>> On Thu, 15 Dec 2016 09:22:07 -0800, Stephen Hemminger
>> <stephen@networkplumber.org> wrote:
>>> On Thu, 15 Dec 2016 11:09:12 -0500
>>> Neil Horman <nhorman@tuxdriver.com> wrote:
>>>
>>>> On Thu, Dec 15, 2016 at 02:46:39PM +0100, Olivier Matz wrote:
>>>>> Add a new macro RTE_PMD_REGISTER_KMOD_DEP() that allows a driver
>>>>> to declare the list of kernel modules required to run properly.
>>>>>
>>>>> Today, most PCI drivers require uio/vfio.
>>>>>
>>>>> Signed-off-by: Olivier Matz <olivier.matz@6wind.com>
>>>>> Acked-by: Fiona Trahe <fiona.trahe@intel.com>
>>>>> ---
>>>>>
>>>>> v2 -> v3:
>>>>> - fix kmods deps advertised by mellanox drivers as pointed out
>>>>> by Adrien
>>>>>
>>>>> v1 ->
>>>>> v2:
>>>>> - do not advertise uio_pci_generic for vf drivers
>>>>> - rebase on top of head: use new driver names and prefix
>>>>> macro with
>>>>> RTE_
>>>>>
>>>>> rfc -> v1:
>>>>> - the kmod information can be per-device using a modalias-like
>>>>> pattern
>>>>> - change syntax to use '&' and '|' instead of ',' and ':'
>>>>> - remove useless prerequisites in kmod lis: no need to
>>>>> specify both uio and uio_pci_generic, only the latter is
>>>>> required
>>>>> - update kmod list in szedata2 driver
>>>>> - remove kmod list in qat driver: it requires more than just
>>>>> loading a kmod, which is described in documentation
>>>>>
>>>>> buildtools/pmdinfogen/pmdinfogen.c | 1 +
>>>>> buildtools/pmdinfogen/pmdinfogen.h | 1 +
>>>>> drivers/net/bnx2x/bnx2x_ethdev.c | 2 ++
>>>>> drivers/net/bnxt/bnxt_ethdev.c | 1 +
>>>>> drivers/net/cxgbe/cxgbe_ethdev.c | 1 +
>>>>> drivers/net/e1000/em_ethdev.c | 1 +
>>>>> drivers/net/e1000/igb_ethdev.c | 2 ++
>>>>> drivers/net/ena/ena_ethdev.c | 1 +
>>>>> drivers/net/enic/enic_ethdev.c | 1 +
>>>>> drivers/net/fm10k/fm10k_ethdev.c | 1 +
>>>>> drivers/net/i40e/i40e_ethdev.c | 1 +
>>>>> drivers/net/i40e/i40e_ethdev_vf.c | 1 +
>>>>> drivers/net/ixgbe/ixgbe_ethdev.c | 2 ++
>>>>> drivers/net/mlx4/mlx4.c | 2 ++
>>>>> drivers/net/mlx5/mlx5.c | 1 +
>>>>> drivers/net/nfp/nfp_net.c | 1 +
>>>>> drivers/net/qede/qede_ethdev.c | 2 ++
>>>>> drivers/net/szedata2/rte_eth_szedata2.c | 2 ++
>>>>> drivers/net/thunderx/nicvf_ethdev.c | 1 +
>>>>> drivers/net/virtio/virtio_ethdev.c | 1 +
>>>>> drivers/net/vmxnet3/vmxnet3_ethdev.c | 1 +
>>>>> lib/librte_eal/common/include/rte_dev.h | 25
>>>>> +++++++++++++++++++++++++ tools/dpdk-pmdinfo.py
>>>>> | 5 ++++- 23 files changed, 56 insertions(+), 1 deletion(-)
>>>>>
>>>> Its odd that all devices, regardless of vendor should depend on the
>>>> igb_uio module. It seems to me that depending on uio_pci_generic
>>>> or vfio is sufficient.
>>
>> igb_uio is the historical uio module of dpdk. Although it is called
>> igb_uio, it is not specific to Intel drivers.
>>
>> Most drivers declare "igb_uio | uio_pci_generic | vfio", which means
>> that any of the 3 kernel modules can be used.
>>
>> I think there are some cases where people will prefer using igb_uio,
>> for instance to use a vf pmd in a vm where there is no iommu,
>> and where the kernel vfio module does not support the no-iommu mode.
>>
>>
>>>
>>> Yes it seems just a special case extension for Mellanox drivers.
>>
>> Kmod deps are different whether it's a vf driver or not.
>> Mellanox drivers are not the only drivers that do not require uio,
>> there is also szedata2.
>>
>> Is it an argument for not including this patch?
>>
> Speaking only for myself, I'm not suggesting the patch not be included, only
> questioning the need to list igb_uio as an optional dependency. From what I
> understand uio_pci_generic is equaly capable of being used in a vf as igb_uio,
> and so it seems like its sufficient to list in the deps alone, or am I missing
> something?
>
> Additionally, in regards to the comment about rebasing on net-next here, I don't
> think thats needed. This patch is built such that you will be able to apply
> this tag to additional drivers later, as they get merged into thomas's tree, you
> don't need to get them all in one shot.
Right, more drivers can be added later. But also I don't see any problem
if this patch rebased on next-net and be a more complete patch. That is
why it was a question to the author.
> More to the point, there are crypto
> drivers that may make use of this module dependency tag, and those are also
> missing. I would suggest taking the patch based on it current state (once the
> above igb_uio issue is settled), and then adding the tag to new drivers in
> subsequent releases as they get merged.
>
> Neil
>
>>
>> Regards,
>> Olivier
>>
next prev parent reply other threads:[~2016-12-16 14:20 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-08-26 13:20 [dpdk-dev] [RFC] " Olivier Matz
2016-08-30 8:40 ` Matej Vido
2016-08-30 8:56 ` Olivier Matz
2016-08-30 13:23 ` [dpdk-dev] [dpdk-dev, RFC] " Neil Horman
2016-08-31 9:21 ` Olivier Matz
2016-08-31 13:27 ` Neil Horman
2016-08-31 13:39 ` Olivier Matz
2016-09-01 12:55 ` Trahe, Fiona
2016-09-01 17:35 ` Neil Horman
2016-09-01 17:41 ` Stephen Hemminger
2016-09-01 19:15 ` Neil Horman
2016-09-02 9:19 ` Trahe, Fiona
2016-09-02 13:33 ` Neil Horman
2016-09-02 13:52 ` Trahe, Fiona
2016-09-02 14:15 ` Neil Horman
2016-09-02 16:13 ` Olivier Matz
2016-09-02 10:55 ` Thomas Monjalon
2016-09-15 14:22 ` [dpdk-dev] [PATCH] " Olivier Matz
2016-09-16 9:49 ` Trahe, Fiona
2016-09-16 14:26 ` David Marchand
2016-09-19 8:17 ` Bruce Richardson
2016-09-19 12:25 ` Olivier Matz
2016-11-22 9:50 ` [dpdk-dev] [PATCH v2] " Olivier Matz
2016-11-22 10:27 ` Adrien Mazarguil
2016-11-22 10:31 ` Olivier Matz
2016-12-15 13:46 ` [dpdk-dev] [PATCH v3] " Olivier Matz
2016-12-15 14:52 ` Ferruh Yigit
2016-12-16 9:36 ` Olivier Matz
2016-12-19 13:30 ` Thomas Monjalon
2016-12-15 16:09 ` Neil Horman
2016-12-15 17:22 ` Stephen Hemminger
2016-12-16 9:22 ` Olivier Matz
2016-12-16 12:37 ` Neil Horman
2016-12-16 13:04 ` Bruce Richardson
2016-12-16 14:19 ` Ferruh Yigit [this message]
2016-12-19 12:42 ` Neil Horman
2016-12-19 14:12 ` Ferruh Yigit
2016-12-16 8:23 ` Adrien Mazarguil
2016-12-20 17:26 ` Thomas Monjalon
2016-12-21 9:21 ` Andrew Rybchenko
2016-12-21 11:37 ` Neil Horman
2016-12-21 11:40 ` Andrew Rybchenko
2016-12-22 11:04 ` Ferruh Yigit
2016-12-22 11:35 ` Andrew Rybchenko
2016-12-22 12:07 ` Ferruh Yigit
2016-12-22 12:08 ` Andrew Rybchenko
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