[dpdk-dev] [PATCH] net/e1000: enable MSI-x for linkup and other events in 82574

Zhao1, Wei wei.zhao1 at intel.com
Wed Oct 10 09:13:37 CEST 2018


Acked-by:  Wei Zhao <wei.zhao1 at intel.com>

> -----Original Message-----
> From: Luca Boccassi [mailto:bluca at debian.org]
> Sent: Tuesday, October 9, 2018 6:33 PM
> To: Zhao1, Wei <wei.zhao1 at intel.com>; dev at dpdk.org
> Cc: Lu, Wenzhuo <wenzhuo.lu at intel.com>; Zhang, Qi Z
> <qi.z.zhang at 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 at dpdk.org] On Behalf Of Luca Boccassi
> > > Sent: Saturday, July 28, 2018 2:13 AM
> > > To: dev at dpdk.org
> > > Cc: Lu, Wenzhuo <wenzhuo.lu at intel.com>; Luca Boccassi
> > > <bluca at 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 at 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


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