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From: Pascal Hambourg <pascal@plouf.fr.eu.org>
Date: Wed, 17 Aug 2011 08:37:18 +0200
Subject: [PATCH 1/2] atm: br2684: Make headroom and hard_header_len depend on the payload type
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>
---
net/atm/br2684.c | 8 ++++++--
1 files changed, 6 insertions(+), 2 deletions(-)
diff --git a/net/atm/br2684.c b/net/atm/br2684.c
index 53b0aa1..ed72263 100644
--- a/net/atm/br2684.c
+++ b/net/atm/br2684.c
@@ -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;
From: Pascal Hambourg <pascal@plouf.fr.eu.org>
Date: Wed, 17 Aug 2011 08:37:52 +0200
Subject: [PATCH 2/2] atm: br2684: Avoid alignment issues
Use memcmp() instead of cast to u16 when checking the PAD field.
Signed-off-by: Pascal Hambourg <pascal@plouf.fr.eu.org>
Signed-off-by: chas williams - CONTRACTOR <chas@cmf.nrl.navy.mil>
---
net/atm/br2684.c | 3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)
diff --git a/net/atm/br2684.c b/net/atm/br2684.c
index ed72263..353fccf 100644
--- a/net/atm/br2684.c
+++ b/net/atm/br2684.c
@@ -53,6 +53,7 @@ static const unsigned char ethertype_ipv4[] = { ETHERTYPE_IPV4 };
static const unsigned char ethertype_ipv6[] = { ETHERTYPE_IPV6 };
static const unsigned char llc_oui_pid_pad[] =
{ LLC, SNAP_BRIDGED, PID_ETHERNET, PAD_BRIDGED };
+static const unsigned char pad[] = { PAD_BRIDGED };
static const unsigned char llc_oui_ipv4[] = { LLC, SNAP_ROUTED, ETHERTYPE_IPV4 };
static const unsigned char llc_oui_ipv6[] = { LLC, SNAP_ROUTED, ETHERTYPE_IPV6 };
@@ -453,7 +454,7 @@ static void br2684_push(struct atm_vcc *atmvcc, struct sk_buff *skb)
skb->pkt_type = PACKET_HOST;
} else { /* p_bridged */
/* first 2 chars should be 0 */
- if (*((u16 *) (skb->data)) != 0)
+ if (memcmp(skb->data, pad, BR2684_PAD_LEN) != 0)
goto error;
skb_pull(skb, BR2684_PAD_LEN);
skb->protocol = eth_type_trans(skb, net_dev);
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