[dpdk-dev] [PATCH 2/2] net: enable IOVA mode for PMDs
Maxime Coquelin
maxime.coquelin at redhat.com
Fri Jan 5 11:32:42 CET 2018
Hi Jianfeng,
On 10/11/2017 12:33 PM, Jianfeng Tan wrote:
> If we want to enable IOVA mode, introduced by
> commit 93878cf0255e ("eal: introduce helper API for IOVA mode"),
> we need PMDs (for PCI devices) to expose this flag.
>
> Signed-off-by: Jianfeng Tan<jianfeng.tan at intel.com>
> ---
> drivers/net/e1000/em_ethdev.c | 3 ++-
> drivers/net/e1000/igb_ethdev.c | 5 +++--
> drivers/net/fm10k/fm10k_ethdev.c | 3 ++-
> drivers/net/i40e/i40e_ethdev.c | 3 ++-
> drivers/net/i40e/i40e_ethdev_vf.c | 2 +-
> drivers/net/ixgbe/ixgbe_ethdev.c | 5 +++--
> 6 files changed, 13 insertions(+), 8 deletions(-)
This patch introduces a regression when doing device assignment in
guest, because current VT-d emulation only supports 39bits guest address
width [0].
In the Bz, Peter suggest we could have an IOVA allocator algorithm,
which could start to allocate IOVAs from 0. I think it could solve the
--no-huge case your series address, do you agree?
But it would be a long term solution, we need to fix this in stable.
Is the --no-huge option used in production, or is it only for testing?
If the latter do you think we could revert your patch while we find a
solution that makes all cases to work?
Ferruh, I see you also faced problems with KNI, how did you solved it?
Thanks,
Maxime
[0]: https://bugzilla.redhat.com/show_bug.cgi?id=1530957#c3
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