From: "Zhao1, Wei" <wei.zhao1@intel.com>
To: Luca Boccassi <bluca@debian.org>, "dev@dpdk.org" <dev@dpdk.org>
Cc: "Lu, Wenzhuo" <wenzhuo.lu@intel.com>,
"Zhang, Qi Z" <qi.z.zhang@intel.com>
Subject: Re: [dpdk-dev] [PATCH] net/e1000: enable MSI-x for linkup and other events in 82574
Date: Wed, 10 Oct 2018 07:13:37 +0000 [thread overview]
Message-ID: <A2573D2ACFCADC41BB3BE09C6DE313CA07E4C5E9@PGSMSX103.gar.corp.intel.com> (raw)
In-Reply-To: <1539081151.8721.24.camel@debian.org>
Acked-by: Wei Zhao <wei.zhao1@intel.com>
> -----Original Message-----
> From: Luca Boccassi [mailto:bluca@debian.org]
> Sent: Tuesday, October 9, 2018 6:33 PM
> To: Zhao1, Wei <wei.zhao1@intel.com>; dev@dpdk.org
> Cc: Lu, Wenzhuo <wenzhuo.lu@intel.com>; Zhang, Qi Z
> <qi.z.zhang@intel.com>
> Subject: Re: [dpdk-dev] [PATCH] net/e1000: enable MSI-x for linkup and
> other events in 82574
>
> On Tue, 2018-10-09 at 10:16 +0000, Zhao1, Wei wrote:
> > Hi, Luca Boccassi
> >
> > A question for this feature, in em code, function
> > eth_em_interrupt_handler() we have no process for handle other cause
> > interrupt.
> > So, why do we enable this OTHER cause interrupt in DPDK?
> > You mean some application may take advance of this interrupt for some
> > unknown purpose when using DPDK?
>
> Hi,
>
> This MSI-x interrupt is for link state change, which is already handled by the
> driver.
> As mentioned, without this link state change for the 82574 NIC does not work.
>
> >
> >
> > > -----Original Message-----
> > > From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Luca Boccassi
> > > Sent: Saturday, July 28, 2018 2:13 AM
> > > To: dev@dpdk.org
> > > Cc: Lu, Wenzhuo <wenzhuo.lu@intel.com>; Luca Boccassi
> > > <bluca@debian.org>
> > > Subject: [dpdk-dev] [PATCH] net/e1000: enable MSI-x for linkup and
> > > other events in 82574
> > >
> > > Linux supports 82574 MSI-x interrupt for linkup and other link
> > > conditions.
> > > Enable the same feature in the e1000 PMD in order to allow this card
> > > to work properly, as it requires interrupt handling for link
> > > negotiations among other things.
> > >
> > > Signed-off-by: Luca Boccassi <bluca@debian.org>
> > > ---
> > >
> > > Hi Wenzhuo - just to make it clear, this patch and the previous are
> > > not targeted for 18.08, just clearing my queue.
> > >
> > > drivers/net/e1000/base/e1000_82571.c | 5 +++++
> > > drivers/net/e1000/em_ethdev.c | 5 +++--
> > > 2 files changed, 8 insertions(+), 2 deletions(-)
> > >
> > > diff --git a/drivers/net/e1000/base/e1000_82571.c
> > > b/drivers/net/e1000/base/e1000_82571.c
> > > index 7c279dbb3..397dd9482 100644
> > > --- a/drivers/net/e1000/base/e1000_82571.c
> > > +++ b/drivers/net/e1000/base/e1000_82571.c
> > > @@ -1257,6 +1257,11 @@ STATIC s32 e1000_init_hw_82571(struct
> > > e1000_hw
> > > *hw)
> > > */
> > > e1000_clear_hw_cntrs_82571(hw);
> > >
> > > + /* MSI-X configure for 82574 */
> > > + if (mac->type == e1000_82574)
> > > + E1000_WRITE_REG(hw, E1000_IVAR,
> > > + (E1000_IVAR_INT_ALLOC_VALID <<
> > > 16));
> > > +
> > > return ret_val;
> > > }
> > >
> > > diff --git a/drivers/net/e1000/em_ethdev.c
> > > b/drivers/net/e1000/em_ethdev.c index 7039dc100..bd05e4de0 100644
> > > --- a/drivers/net/e1000/em_ethdev.c
> > > +++ b/drivers/net/e1000/em_ethdev.c
> > > @@ -1444,7 +1444,8 @@ eth_em_interrupt_setup(struct rte_eth_dev
> > > *dev)
> > > /* clear interrupt */
> > > E1000_READ_REG(hw, E1000_ICR);
> > > regval = E1000_READ_REG(hw, E1000_IMS);
> > > - E1000_WRITE_REG(hw, E1000_IMS, regval | E1000_ICR_LSC);
> > > + E1000_WRITE_REG(hw, E1000_IMS,
> > > + regval | E1000_ICR_LSC | E1000_ICR_OTHER);
> > > return 0;
> > > }
> > >
> > > @@ -1494,7 +1495,7 @@ em_rxq_intr_enable(struct e1000_hw
> > > *hw) static
> > > void em_lsc_intr_disable(struct e1000_hw *hw) {
> > > - E1000_WRITE_REG(hw, E1000_IMC, E1000_IMS_LSC);
> > > + E1000_WRITE_REG(hw, E1000_IMC, E1000_IMS_LSC |
> > > E1000_IMS_OTHER);
> > > E1000_WRITE_FLUSH(hw);
> > > }
> > >
> > > --
> > > 2.18.0
> >
> >
>
> --
> Kind regards,
> Luca Boccassi
next prev parent reply other threads:[~2018-10-10 7:13 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-27 18:13 Luca Boccassi
2018-09-26 10:23 ` Luca Boccassi
2018-10-09 10:16 ` Zhao1, Wei
2018-10-09 10:32 ` Luca Boccassi
2018-10-10 7:13 ` Zhao1, Wei [this message]
2018-10-10 17:58 ` Zhang, Qi Z
2018-10-09 10:29 ` Zhao1, Wei
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