From: "Wu, Jingjing" <jingjing.wu@intel.com>
To: "Zhang, Qi Z" <qi.z.zhang@intel.com>,
Thomas Monjalon <thomas.monjalon@6wind.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>, "Yigit, Ferruh" <ferruh.yigit@intel.com>
Subject: Re: [dpdk-dev] [PATCH v2] net/i40e: fix wrong handle when enable interrupt
Date: Thu, 30 Mar 2017 12:26:17 +0000 [thread overview]
Message-ID: <9BB6961774997848B5B42BEC655768F810D1BAE5@SHSMSX103.ccr.corp.intel.com> (raw)
In-Reply-To: <039ED4275CED7440929022BC67E706115306A09F@SHSMSX103.ccr.corp.intel.com>
> -----Original Message-----
> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Zhang, Qi Z
> Sent: Tuesday, March 21, 2017 7:34 PM
> To: Thomas Monjalon <thomas.monjalon@6wind.com>
> Cc: dev@dpdk.org; Yigit, Ferruh <ferruh.yigit@intel.com>
> Subject: Re: [dpdk-dev] [PATCH v2] net/i40e: fix wrong handle when enable
> interrupt
>
> Hi Thomas:
>
>
> > -----Original Message-----
> > From: Zhang, Qi Z
> > Sent: Tuesday, March 21, 2017 8:10 PM
> > To: Wu, Jingjing <jingjing.wu@intel.com>; Zhang, Helin
> > <helin.zhang@intel.com>
> > Cc: dev@dpdk.org; Zhang, Qi Z <qi.z.zhang@intel.com>; stable@dpdk.org
> > Subject: [PATCH v2] net/i40e: fix wrong handle when enable interrupt
> >
> > In i40e_dev_interrupt_handler, when call rte_intr_enable, the
> > intr_handle is the copy when we registered.
> > According to interrupt handle framework, if the requirement of
> > intr_handle is changed, we need to unregister then register a new
> > copy. This happens on i40e driver when bind to vfio-pci, the
> > rte_intr_efd_enable function will modify the max_intr according the
> > queue number, so a new copy of intr_handle need to be registered.
> > Without this fix, we saw lw3fwd-power does not work due to wrong
> > interrupt count in vfio_irq_set when set vfio interrupt.
> >
> > Fixes: 2ce7a1ed09fc ("net/i40e: localize mapping of ethdev to PCI
> > device")
> >
> > Cc: stable@dpdk.org
> >
> > Signed-off-by: Qi Zhang <qi.z.zhang@intel.com>
> > ---
> > v2:
> > - follow current design, when intr_handle is modified, unregister
> > the old one and register the new one.
> > - there should be a patch set to fix on other devices.
> >
> > drivers/net/i40e/i40e_ethdev.c | 8 ++++++++
> > 1 file changed, 8 insertions(+)
> >
> > diff --git a/drivers/net/i40e/i40e_ethdev.c
> > b/drivers/net/i40e/i40e_ethdev.c index 9c76baa..e7bbea5 100644
> > --- a/drivers/net/i40e/i40e_ethdev.c
> > +++ b/drivers/net/i40e/i40e_ethdev.c
> > @@ -1886,6 +1886,14 @@ i40e_dev_start(struct rte_eth_dev *dev)
> > ret = rte_intr_efd_enable(intr_handle, intr_vector);
> > if (ret)
> > return ret;
> > + /**
> > + * intr_handle may be modified in rte_intr_efd_enable
> > + * so unregster the old one and register the new one.
> > + */
> > + rte_intr_callback_unregister(intr_handle,
> > + i40e_dev_interrupt_handler, dev);
> > + rte_intr_callback_register(intr_handle,
> > + i40e_dev_interrupt_handler, dev);
> To me, this fix looks a little bit weird.
> May I know why we need to register an copy of intr_handle ?
> What do you think about my previous clean up patch.
> http://dpdk.org/dev/patchwork/patch/21529/
> Thanks
> Qi.
It seems [dpdk-dev,v2,1/3] vfio: keep interrupt source read only
http://www.dpdk.org/dev/patchwork/patch/21528/ is already
be acked by Anatoly.
I think we need to support that change, but not this workaround.
next prev parent reply other threads:[~2017-03-30 12:26 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-02-09 20:02 [dpdk-dev] [PATCH] " Qi Zhang
2017-02-10 10:03 ` Ferruh Yigit
2017-03-21 12:09 ` [dpdk-dev] [PATCH v2] " Qi Zhang
2017-03-21 11:34 ` Zhang, Qi Z
2017-03-30 12:26 ` Wu, Jingjing [this message]
2017-04-11 11:00 ` Ferruh Yigit
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