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atm: br2684: Make headroom and hard_header_len depend on the payload type

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Routed payload requires less headroom than bridged payload.
So do not reallocate headroom if not needed.
Also, add worst case AAL5 overhead to netdev->hard_header_len.

Signed-off-by: Pascal Hambourg <pascal@plouf.fr.eu.org>
Signed-off-by: chas williams - CONTRACTOR <chas@cmf.nrl.navy.mil>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Pascal Hambourg 2011-08-17 08:37:18 +02:00 committed by David S. Miller
parent 08e29af3a9
commit 9e667b2988
1 changed files with 6 additions and 2 deletions
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8
net/atm/br2684.c
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@ -202,7 +202,10 @@ static int br2684_xmit_vcc(struct sk_buff *skb, struct net_device *dev,
{
struct br2684_dev *brdev = BRPRIV(dev);
struct atm_vcc *atmvcc;
int minheadroom = (brvcc->encaps == e_llc) ? 10 : 2;
int minheadroom = (brvcc->encaps == e_llc) ?
((brdev->payload == p_bridged) ?
sizeof(llc_oui_pid_pad) : sizeof(llc_oui_ipv4)) :
((brdev->payload == p_bridged) ? BR2684_PAD_LEN : 0);
if (skb_headroom(skb) < minheadroom) {
struct sk_buff *skb2 = skb_realloc_headroom(skb, minheadroom);
@ -583,6 +586,7 @@ static void br2684_setup(struct net_device *netdev)
struct br2684_dev *brdev = BRPRIV(netdev);
ether_setup(netdev);
netdev->hard_header_len += sizeof(llc_oui_pid_pad); /* worst case */
brdev->net_dev = netdev;
netdev->netdev_ops = &br2684_netdev_ops;
@ -595,7 +599,7 @@ static void br2684_setup_routed(struct net_device *netdev)
struct br2684_dev *brdev = BRPRIV(netdev);
brdev->net_dev = netdev;
netdev->hard_header_len = 0;
netdev->hard_header_len = sizeof(llc_oui_ipv4); /* worst case */
netdev->netdev_ops = &br2684_netdev_ops_routed;
netdev->addr_len = 0;
netdev->mtu = 1500;