netdev - RE: [PATCH net] net: wangxun: Fix vector length of interrupt cause

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Date:   Fri, 24 Mar 2023 10:01:55 +0800
From:   Jiawen Wu <jiawenwu@...stnetic.com>
To:     <Steen.Hegelund@...rochip.com>, <netdev@...r.kernel.org>
Cc:     <mengyuanlou@...-swift.com>
Subject: RE: [PATCH net] net: wangxun: Fix vector length of interrupt cause

On Thursday, March 23, 2023 6:50 PM, Steen.Hegelund@...rochip.com wrote:
> 
> Hi Jiawen,
> 
> 
> On Wed Mar 22, 2023 at 11:36 AM CET, Jiawen Wu wrote:
> > EXTERNAL EMAIL: Do not click links or open attachments unless you know
> > the content is safe
> >
> > There is 64-bit interrupt cause register for txgbe. Fix to clear upper
> > 32 bits.
> >
> > Fixes: 3f703186113f ("net: libwx: Add irq flow functions")
> > Signed-off-by: Jiawen Wu <jiawenwu@...stnetic.com>
> > ---
> >  drivers/net/ethernet/wangxun/libwx/wx_type.h    | 2 +-
> >  drivers/net/ethernet/wangxun/ngbe/ngbe_main.c   | 2 +-
> >  drivers/net/ethernet/wangxun/txgbe/txgbe_main.c | 3 ++-
> >  3 files changed, 4 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/net/ethernet/wangxun/libwx/wx_type.h
> > b/drivers/net/ethernet/wangxun/libwx/wx_type.h
> > index 77d8d7f1707e..97e2c1e13b80 100644
> > --- a/drivers/net/ethernet/wangxun/libwx/wx_type.h
> > +++ b/drivers/net/ethernet/wangxun/libwx/wx_type.h
> > @@ -222,7 +222,7 @@
> >  #define WX_PX_INTA                   0x110
> >  #define WX_PX_GPIE                   0x118
> >  #define WX_PX_GPIE_MODEL             BIT(0)
> > -#define WX_PX_IC                     0x120
> > +#define WX_PX_IC(_i)                 (0x120 + (_i) * 4)
> >  #define WX_PX_IMS(_i)                (0x140 + (_i) * 4)
> >  #define WX_PX_IMC(_i)                (0x150 + (_i) * 4)
> >  #define WX_PX_ISB_ADDR_L             0x160
> > diff --git a/drivers/net/ethernet/wangxun/ngbe/ngbe_main.c
> > b/drivers/net/ethernet/wangxun/ngbe/ngbe_main.c
> > index 5b564d348c09..17412e5282de 100644
> > --- a/drivers/net/ethernet/wangxun/ngbe/ngbe_main.c
> > +++ b/drivers/net/ethernet/wangxun/ngbe/ngbe_main.c
> > @@ -352,7 +352,7 @@ static void ngbe_up(struct wx *wx)
> >         netif_tx_start_all_queues(wx->netdev);
> >
> >         /* clear any pending interrupts, may auto mask */
> > -       rd32(wx, WX_PX_IC);
> > +       rd32(wx, WX_PX_IC(0));
> 
> Here you only clear irq 0 but not 1...
> 
> >         rd32(wx, WX_PX_MISC_IC);
> >         ngbe_irq_enable(wx, true);
> >         if (wx->gpio_ctrl)
> > diff --git a/drivers/net/ethernet/wangxun/txgbe/txgbe_main.c
> > b/drivers/net/ethernet/wangxun/txgbe/txgbe_main.c
> > index 6c0a98230557..a58ce5463686 100644
> > --- a/drivers/net/ethernet/wangxun/txgbe/txgbe_main.c
> > +++ b/drivers/net/ethernet/wangxun/txgbe/txgbe_main.c
> > @@ -229,7 +229,8 @@ static void txgbe_up_complete(struct wx *wx)
> >         wx_napi_enable_all(wx);
> >
> >         /* clear any pending interrupts, may auto mask */
> > -       rd32(wx, WX_PX_IC);
> > +       rd32(wx, WX_PX_IC(0));
> > +       rd32(wx, WX_PX_IC(1));
> 
> Here you clear irq 0 and 1
> 
> >         rd32(wx, WX_PX_MISC_IC);
> >         txgbe_irq_enable(wx, true);
> >
> > --
> > 2.27.0
> 
> Why is there a difference between the two situations?
> 
> BR
> Steen

There is two different chip with different hardware design.
The register WX_PX_IC has total 64 bits in its low and high registers, which names WX_PX_IC(0) and WX_PX_IC(1).
For txgbe, it's necessary to clear irq 0-63, but 0-8 for ngbe.