netdev - Re: [PATCH net-next v3 03/07] tulip: Support for byte queue limits

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Date:	Sun, 20 Oct 2013 20:00:25 -0700
From:	Grant Grundler <grantgrundler@...il.com>
To:	Tino Reichardt <milky-kernel@...ilk.de>
Cc:	"open list:TULIP NETWORK DRI..." <netdev@...r.kernel.org>,
	Grant Grundler <grundler@...isc-linux.org>
Subject: Re: [PATCH net-next v3 03/07] tulip: Support for byte queue limits

On Sun, Oct 20, 2013 at 12:23 PM, Tino Reichardt <milky-kernel@...ilk.de> wrote:
> Changes to tulip driver to use byte queue limits.
>
>
> Signed-off-by: Tino Reichardt <milky-kernel@...ilk.de>

LGTM - I no longer have HW setup to test this. Only code reviewed. I'd
be happy to re-assign to anyone who is still using this HW and help
them review patches.

Acked-by: Grant Grundler <grundler@...isc-linux.org>

cheers,
grant

>
> ---
>  drivers/net/ethernet/dec/tulip/interrupt.c  | 4 ++++
>  drivers/net/ethernet/dec/tulip/tulip.h      | 1 +
>  drivers/net/ethernet/dec/tulip/tulip_core.c | 9 ++++++++-
>  3 files changed, 13 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/ethernet/dec/tulip/interrupt.c b/drivers/net/ethernet/dec/tulip/interrupt.c
> index 92306b3..7084267 100644
> --- a/drivers/net/ethernet/dec/tulip/interrupt.c
> +++ b/drivers/net/ethernet/dec/tulip/interrupt.c
> @@ -532,6 +532,7 @@ irqreturn_t tulip_interrupt(int irq, void *dev_instance)
>  #endif
>         unsigned int work_count = tulip_max_interrupt_work;
>         unsigned int handled = 0;
> +       unsigned int bytes_compl = 0;
>
>         /* Let's see whether the interrupt really is for us */
>         csr5 = ioread32(ioaddr + CSR5);
> @@ -634,6 +635,7 @@ irqreturn_t tulip_interrupt(int irq, void *dev_instance)
>                                                  PCI_DMA_TODEVICE);
>
>                                 /* Free the original skb. */
> +                               bytes_compl += tp->tx_buffers[entry].skb->len;
>                                 dev_kfree_skb_irq(tp->tx_buffers[entry].skb);
>                                 tp->tx_buffers[entry].skb = NULL;
>                                 tp->tx_buffers[entry].mapping = 0;
> @@ -802,6 +804,8 @@ irqreturn_t tulip_interrupt(int irq, void *dev_instance)
>         }
>  #endif /* CONFIG_TULIP_NAPI */
>
> +       if (likely(tulip_bql_disable == false))
> +               netdev_completed_queue(dev, tx, bytes_compl);
>         if ((missed = ioread32(ioaddr + CSR8) & 0x1ffff)) {
>                 dev->stats.rx_dropped += missed & 0x10000 ? 0x10000 : missed;
>         }
> diff --git a/drivers/net/ethernet/dec/tulip/tulip.h b/drivers/net/ethernet/dec/tulip/tulip.h
> index 38431a1..3c62870 100644
> --- a/drivers/net/ethernet/dec/tulip/tulip.h
> +++ b/drivers/net/ethernet/dec/tulip/tulip.h
> @@ -513,6 +513,7 @@ void comet_timer(unsigned long data);
>
>  /* tulip_core.c */
>  extern int tulip_debug;
> +extern bool tulip_bql_disable;
>  extern const char * const medianame[];
>  extern const char tulip_media_cap[];
>  extern struct tulip_chip_table tulip_tbl[];
> diff --git a/drivers/net/ethernet/dec/tulip/tulip_core.c b/drivers/net/ethernet/dec/tulip/tulip_core.c
> index 4e8cfa2..d02eaa1 100644
> --- a/drivers/net/ethernet/dec/tulip/tulip_core.c
> +++ b/drivers/net/ethernet/dec/tulip/tulip_core.c
> @@ -106,11 +106,13 @@ static int csr0 = 0x00A00000 | 0x4800;
>  /* Time in jiffies before concluding the transmitter is hung. */
>  #define TX_TIMEOUT  (4*HZ)
>
> -
>  MODULE_AUTHOR("The Linux Kernel Team");
>  MODULE_DESCRIPTION("Digital 21*4* Tulip ethernet driver");
>  MODULE_LICENSE("GPL");
>  MODULE_VERSION(DRV_VERSION);
> +module_param(tulip_bql_disable, bool, 0);
> +MODULE_PARM_DESC(tulip_bql_disable,
> +       "Disable Byte Queue Limits functionality (default: false)");
>  module_param(tulip_debug, int, 0);
>  module_param(max_interrupt_work, int, 0);
>  module_param(rx_copybreak, int, 0);
> @@ -123,6 +125,7 @@ int tulip_debug = TULIP_DEBUG;
>  #else
>  int tulip_debug = 1;
>  #endif
> +bool tulip_bql_disable;
>
>  static void tulip_timer(unsigned long data)
>  {
> @@ -703,6 +706,8 @@ tulip_start_xmit(struct sk_buff *skb, struct net_device *dev)
>         wmb();
>
>         tp->cur_tx++;
> +       if (likely(tulip_bql_disable == false))
> +               netdev_sent_queue(dev, skb->len);
>
>         /* Trigger an immediate transmit demand. */
>         iowrite32(0, tp->base_addr + CSR1);
> @@ -746,6 +751,8 @@ static void tulip_clean_tx_ring(struct tulip_private *tp)
>                 tp->tx_buffers[entry].skb = NULL;
>                 tp->tx_buffers[entry].mapping = 0;
>         }
> +       if (likely(tulip_bql_disable == false))
> +               netdev_reset_queue(tp->dev);
>  }
>
>  static void tulip_down (struct net_device *dev)
> --
> 1.8.4.1
>
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