Subject: Re: [PATCH] fs_enet: Update for API changes

From: Vitaly Bordug <[email-masked]>
Date: Thu, 18 Oct 2007 02:40:15 +0400

Hello Scott,

On Wed, 17 Oct 2007 12:42:43 -0500
Scott Wood wrote:

> This driver was recently broken by several changes for which this
> driver was not (or was improperly) updated:
> 
> 1. SET_MODULE_OWNER() was removed.
> 2. netif_napi_add() was only being called when building with
> the old CPM binding.
> 3. The received/budget test was backwards.
> 4. to_net_dev() was wrong -- the device struct embedded in
> the net_device struct is not the same as the of_platform
> device in the private struct.
> 5. napi_disable/napi_enable was being called even when napi
> was not being used.
> 
Good cleanup, thanks!

Jeff: this is important fix, and should be applied if possible.

> These changes have been fixed, and napi is now on by default.
> 
> Signed-off-by: Scott Wood <[email-masked]>
Acked-by: Vitaly Bordug <[email-masked]>
> ---
>  drivers/net/fs_enet/fs_enet-main.c |   28 ++++++++++++++++------------
>  drivers/net/fs_enet/fs_enet.h      |    1 +
>  2 files changed, 17 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/net/fs_enet/fs_enet-main.c b/drivers/net/fs_enet/fs_enet-main.c
> index 04c6fae..f2a4d39 100644
> --- a/drivers/net/fs_enet/fs_enet-main.c
> +++ b/drivers/net/fs_enet/fs_enet-main.c
> @@ -88,7 +88,7 @@ static void skb_align(struct sk_buff *skb, int align)
>  static int fs_enet_rx_napi(struct napi_struct *napi, int budget)
>  {
>  	struct fs_enet_private *fep = container_of(napi, struct fs_enet_private, napi);
> -	struct net_device *dev = to_net_dev(fep->dev);
> +	struct net_device *dev = fep->ndev;
>  	const struct fs_platform_info *fpi = fep->fpi;
>  	cbd_t __iomem *bdp;
>  	struct sk_buff *skb, *skbn, *skbt;
> @@ -217,7 +217,7 @@ static int fs_enet_rx_napi(struct napi_struct *napi, int budget)
>  
>  	fep->cur_rx = bdp;
>  
> -	if (received >= budget) {
> +	if (received < budget) {
>  		/* done */
>  		netif_rx_complete(dev, napi);
>  		(*fep->ops->napi_enable_rx)(dev);
> @@ -807,20 +807,23 @@ static int fs_enet_open(struct net_device *dev)
>  	int r;
>  	int err;
>  
> -	napi_enable(&fep->napi);
> +	if (fep->fpi->use_napi)
> +		napi_enable(&fep->napi);
>  
>  	/* Install our interrupt handler. */
>  	r = fs_request_irq(dev, fep->interrupt, "fs_enet-mac", fs_enet_interrupt);
>  	if (r != 0) {
>  		printk(KERN_ERR DRV_MODULE_NAME
>  		       ": %s Could not allocate FS_ENET IRQ!", dev->name);
> -		napi_disable(&fep->napi);
> +		if (fep->fpi->use_napi)
> +			napi_disable(&fep->napi);
>  		return -EINVAL;
>  	}
>  
>  	err = fs_init_phy(dev);
> -	if(err) {
> -		napi_disable(&fep->napi);
> +	if (err) {
> +		if (fep->fpi->use_napi)
> +			napi_disable(&fep->napi);
>  		return err;
>  	}
>  	phy_start(fep->phydev);
> @@ -1232,7 +1235,7 @@ static int __devinit fs_enet_probe(struct of_device *ofdev,
>  	fpi->rx_ring = 32;
>  	fpi->tx_ring = 32;
>  	fpi->rx_copybreak = 240;
> -	fpi->use_napi = 0;
> +	fpi->use_napi = 1;
>  	fpi->napi_weight = 17;
>  
>  	ret = find_phy(ofdev->node, fpi);
> @@ -1249,11 +1252,11 @@ static int __devinit fs_enet_probe(struct of_device *ofdev,
>  		goto out_free_fpi;
>  	}
>  
> -	SET_MODULE_OWNER(ndev);
>  	dev_set_drvdata(&ofdev->dev, ndev);
>  
>  	fep = netdev_priv(ndev);
>  	fep->dev = &ofdev->dev;
> +	fep->ndev = ndev;
>  	fep->fpi = fpi;
>  	fep->ops = match->data;
>  
> @@ -1288,10 +1291,11 @@ static int __devinit fs_enet_probe(struct of_device *ofdev,
>  	ndev->stop = fs_enet_close;
>  	ndev->get_stats = fs_enet_get_stats;
>  	ndev->set_multicast_list = fs_set_multicast_list;
> -	if (fpi->use_napi) {
> -		ndev->poll = fs_enet_rx_napi;
> -		ndev->weight = fpi->napi_weight;
> -	}
> +
> +	if (fpi->use_napi)
> +		netif_napi_add(ndev, &fep->napi, fs_enet_rx_napi,
> +		               fpi->napi_weight);
> +
>  	ndev->ethtool_ops = &fs_ethtool_ops;
>  	ndev->do_ioctl = fs_ioctl;
>  
> diff --git a/drivers/net/fs_enet/fs_enet.h b/drivers/net/fs_enet/fs_enet.h
> index baf6477..c675e29 100644
> --- a/drivers/net/fs_enet/fs_enet.h
> +++ b/drivers/net/fs_enet/fs_enet.h
> @@ -75,6 +75,7 @@ struct phy_info {
>  struct fs_enet_private {
>  	struct napi_struct napi;
>  	struct device *dev;	/* pointer back to the device (must be initialized first) */
> +	struct net_device *ndev;
>  	spinlock_t lock;	/* during all ops except TX pckt processing */
>  	spinlock_t tx_lock;	/* during fs_start_xmit and fs_tx         */
>  	struct fs_platform_info *fpi;

-- 
Sincerely, Vitaly