netdev - Re: [PATCH] via-velocity: fix vlan receipt

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Date:	Fri, 25 Apr 2008 01:47:29 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Francois Romieu <romieu@...zoreil.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Séguier Régis 
	<rseguier@...eleport.net>, netdev@...r.kernel.org
Subject: Re: [PATCH] via-velocity: fix vlan receipt

Francois Romieu wrote:
> - vlans were using a single CAM register (see mac_set_vlan_cam)
> - setting the address filtering registers for vlans is not
>   needed when there is no vlan
> 
> The non-tagged interface is filtered out as soon as a tagged
> (!= 0) interface is created. Its traffic appears again when an
> zero-tagged interface is created.
> 
> Tested on Via Epia SN (VT6130 chipset) with several vlans whose
> tag was above or beyond 255.
> 
> Signed-off-by: Séguier Régis <rseguier@...eleport.net>
> Acked-by: Francois Romieu <romieu@...zoreil.com>
> ---
>  drivers/net/via-velocity.c |   46 ++++++++++++++++++++++++++-----------------
>  1 files changed, 28 insertions(+), 18 deletions(-)
> 
> diff --git a/drivers/net/via-velocity.c b/drivers/net/via-velocity.c
> index ed1afaf..036c5c9 100644
> --- a/drivers/net/via-velocity.c
> +++ b/drivers/net/via-velocity.c
> @@ -605,7 +605,6 @@ static void __devinit velocity_get_options(struct velocity_opt *opts, int index,
>  static void velocity_init_cam_filter(struct velocity_info *vptr)
>  {
>  	struct mac_regs __iomem * regs = vptr->mac_regs;
> -	unsigned short vid;
>  
>  	/* Turn on MCFG_PQEN, turn off MCFG_RTGOPT */
>  	WORD_REG_BITS_SET(MCFG_PQEN, MCFG_RTGOPT, &regs->MCFG);
> @@ -617,29 +616,33 @@ static void velocity_init_cam_filter(struct velocity_info *vptr)
>  	mac_set_vlan_cam_mask(regs, vptr->vCAMmask);
>  	mac_set_cam_mask(regs, vptr->mCAMmask);
>  
> -	/* Enable first VCAM */
> +	/* Enable VCAMs */
>  	if (vptr->vlgrp) {
> -		for (vid = 0; vid < VLAN_VID_MASK; vid++) {
> -			if (vlan_group_get_device(vptr->vlgrp, vid)) {
> -				/* If Tagging option is enabled and
> -				   VLAN ID is not zero, then
> -				   turn on MCFG_RTGOPT also */
> -				if (vid != 0)
> -					WORD_REG_BITS_ON(MCFG_RTGOPT, &regs->MCFG);
> +		unsigned int vid, i = 0;
> +
> +		if (!vlan_group_get_device(vptr->vlgrp, 0))
> +			WORD_REG_BITS_ON(MCFG_RTGOPT, &regs->MCFG);
>  
> -				mac_set_vlan_cam(regs, 0, (u8 *) &vid);
> +		for (vid = 1; (vid < VLAN_VID_MASK); vid++) {
> +			if (vlan_group_get_device(vptr->vlgrp, vid)) {
> +				mac_set_vlan_cam(regs, i, (u8 *) &vid);
> +				vptr->vCAMmask[i / 8] |= 0x1 << (i % 8);
> +				if (++i >= VCAM_SIZE)
> +					break;
>  			}
>  		}
> -		vptr->vCAMmask[0] |= 1;
>  		mac_set_vlan_cam_mask(regs, vptr->vCAMmask);
> -	} else {
> -		u16 temp = 0;
> -		mac_set_vlan_cam(regs, 0, (u8 *) &temp);
> -		temp = 1;
> -		mac_set_vlan_cam_mask(regs, (u8 *) &temp);
>  	}
>  }
>  
> +static void velocity_vlan_rx_register(struct net_device *dev,
> +				      struct vlan_group *grp)
> +{
> +	struct velocity_info *vptr = netdev_priv(dev);
> +
> +	vptr->vlgrp = grp;
> +}
> +
>  static void velocity_vlan_rx_add_vid(struct net_device *dev, unsigned short vid)
>  {
>  	struct velocity_info *vptr = netdev_priv(dev);
> @@ -959,11 +962,13 @@ static int __devinit velocity_found1(struct pci_dev *pdev, const struct pci_devi
>  
>  	dev->vlan_rx_add_vid = velocity_vlan_rx_add_vid;
>  	dev->vlan_rx_kill_vid = velocity_vlan_rx_kill_vid;
> +	dev->vlan_rx_register = velocity_vlan_rx_register;
>  
>  #ifdef  VELOCITY_ZERO_COPY_SUPPORT
>  	dev->features |= NETIF_F_SG;
>  #endif
> -	dev->features |= NETIF_F_HW_VLAN_TX | NETIF_F_HW_VLAN_FILTER;
> +	dev->features |= NETIF_F_HW_VLAN_TX | NETIF_F_HW_VLAN_FILTER |
> +		NETIF_F_HW_VLAN_RX;
>  
>  	if (vptr->flags & VELOCITY_FLAGS_TX_CSUM)
>  		dev->features |= NETIF_F_IP_CSUM;
> @@ -1597,8 +1602,13 @@ static int velocity_receive_frame(struct velocity_info *vptr, int idx)
>  	skb_put(skb, pkt_len - 4);
>  	skb->protocol = eth_type_trans(skb, vptr->dev);
>  
> +	if (vptr->vlgrp && (rd->rdesc0.RSR & RSR_DETAG)) {
> +		vlan_hwaccel_rx(skb, vptr->vlgrp,
> +				swab16(le16_to_cpu(rd->rdesc1.PQTAG));
> +	} else
> +		netif_rx(skb);
> +
>  	stats->rx_bytes += pkt_len;
> -	netif_rx(skb);
>  

applied


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