From: Bruce Richardson <bruce.richardson@intel.com>
To: Neil Horman <nhorman@tuxdriver.com>
Cc: Olivier Matz <olivier.matz@6wind.com>,
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 13:04:56 +0000 [thread overview]
Message-ID: <20161216130456.GA154860@bricha3-MOBL3.ger.corp.intel.com> (raw)
In-Reply-To: <20161216123738.GA2255@hmsreliant.think-freely.org>
On Fri, Dec 16, 2016 at 07:37:38AM -0500, 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?
>
Unfortunately uio_pci_generic cannot be used with VFs either inside or
outside a VM, as VFs use MSI/MSI-X rather than legacy interrupts. For
newer kernels with vfio-noiommu, that is an option, but for any other
case, igb_uio is needed.
/Bruce
next prev parent reply other threads:[~2016-12-16 13:05 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 [this message]
2016-12-16 14:19 ` Ferruh Yigit
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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