Vlad Yasevich
2014-Mar-28 01:49 UTC
[PATCH v4 net] bridge: use is_skb_forwardable in forward path
Use existing function instead of trying to use our own. This allows
us to better handle Q-in-Q packets.
Signed-off-by: Vlad Yasevich <vyasevic@redhat.com>
---
v2: Fix missing hunk in patch 2/2 to make it build.
v3: Fix indent for is_skb_forwardable
v4: Made is_skb_forwardable inline in netdevice.h and squashed
the 2 patches into one since having 2 doesn't make much sense
any more.
include/linux/netdevice.h | 24 ++++++++++++++++++++++++
net/bridge/br_forward.c | 9 ++-------
net/core/dev.c | 21 ---------------------
3 files changed, 26 insertions(+), 28 deletions(-)
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index e8eeebd..5d07fee 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -3146,6 +3146,30 @@ static inline void skb_gso_error_unwind(struct sk_buff
*skb, __be16 protocol,
skb->mac_len = mac_len;
}
+
+#include <linux/if_vlan.h>
+
+static inline bool is_skb_forwardable(struct net_device *dev,
+ struct sk_buff *skb)
+{
+ unsigned int len;
+
+ if (!(dev->flags & IFF_UP))
+ return false;
+
+ len = dev->mtu + dev->hard_header_len + VLAN_HLEN;
+ if (skb->len <= len)
+ return true;
+
+ /* if TSO is enabled, we don't care about the length as the packet
+ * could be forwarded without being segmented before
+ */
+ if (skb_is_gso(skb))
+ return true;
+
+ return false;
+}
+
static inline bool netif_is_macvlan(struct net_device *dev)
{
return dev->priv_flags & IFF_MACVLAN;
diff --git a/net/bridge/br_forward.c b/net/bridge/br_forward.c
index d3409e6..056b67b 100644
--- a/net/bridge/br_forward.c
+++ b/net/bridge/br_forward.c
@@ -35,16 +35,11 @@ static inline int should_deliver(const struct
net_bridge_port *p,
p->state == BR_STATE_FORWARDING;
}
-static inline unsigned int packet_length(const struct sk_buff *skb)
-{
- return skb->len - (skb->protocol == htons(ETH_P_8021Q) ? VLAN_HLEN : 0);
-}
-
int br_dev_queue_push_xmit(struct sk_buff *skb)
{
/* ip_fragment doesn't copy the MAC header */
if (nf_bridge_maybe_copy_header(skb) ||
- (packet_length(skb) > skb->dev->mtu && !skb_is_gso(skb)))
{
+ !is_skb_forwardable(skb->dev, skb)) {
kfree_skb(skb);
} else {
skb_push(skb, ETH_HLEN);
@@ -71,7 +66,7 @@ static void __br_deliver(const struct net_bridge_port *to,
struct sk_buff *skb)
skb->dev = to->dev;
if (unlikely(netpoll_tx_running(to->br->dev))) {
- if (packet_length(skb) > skb->dev->mtu && !skb_is_gso(skb))
+ if (!is_skb_forwardable(skb->dev, skb))
kfree_skb(skb);
else {
skb_push(skb, ETH_HLEN);
diff --git a/net/core/dev.c b/net/core/dev.c
index b1b0c8d..3e4a965 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1645,27 +1645,6 @@ static inline void net_timestamp_set(struct sk_buff *skb)
__net_timestamp(SKB); \
} \
-static inline bool is_skb_forwardable(struct net_device *dev,
- struct sk_buff *skb)
-{
- unsigned int len;
-
- if (!(dev->flags & IFF_UP))
- return false;
-
- len = dev->mtu + dev->hard_header_len + VLAN_HLEN;
- if (skb->len <= len)
- return true;
-
- /* if TSO is enabled, we don't care about the length as the packet
- * could be forwarded without being segmented before
- */
- if (skb_is_gso(skb))
- return true;
-
- return false;
-}
-
/**
* dev_forward_skb - loopback an skb to another netif
*
--
1.8.5.3