From: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
From: Vladimir Oltean <vladimir.oltean@xxxxxxx>
[ Upstream commit 952a06345015867e3bd37f8d9045fc1429637d43 ]
Now that we have a central TX reallocation procedure that accounts for
the tagger's needed headroom in a generic way, we can remove the
skb_cow_head call.
Similar to the EtherType DSA tagger, the old Marvell tagger can
transform an 802.1Q header if present into a DSA tag, so there is no
headroom required in that case. But we are ensuring that it exists,
regardless (practically speaking, the headroom must be 4 bytes larger
than it needs to be).
Signed-off-by: Vladimir Oltean <vladimir.oltean@xxxxxxx>
Reviewed-by: Florian Fainelli <f.fainelli@xxxxxxxxx>
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
net/dsa/tag_dsa.c | 5 -----
1 file changed, 5 deletions(-)
diff --git a/net/dsa/tag_dsa.c b/net/dsa/tag_dsa.c
index 0b756fae68a5..63d690a0fca6 100644
--- a/net/dsa/tag_dsa.c
+++ b/net/dsa/tag_dsa.c
@@ -23,9 +23,6 @@ static struct sk_buff *dsa_xmit(struct sk_buff *skb, struct net_device *dev)
* the ethertype field for untagged packets.
*/
if (skb->protocol == htons(ETH_P_8021Q)) {
- if (skb_cow_head(skb, 0) < 0)
- return NULL;
-
/*
* Construct tagged FROM_CPU DSA tag from 802.1q tag.
*/
@@ -41,8 +38,6 @@ static struct sk_buff *dsa_xmit(struct sk_buff *skb, struct net_device *dev)
dsa_header[2] &= ~0x10;
}
} else {
- if (skb_cow_head(skb, DSA_HLEN) < 0)
- return NULL;
skb_push(skb, DSA_HLEN);
memmove(skb->data, skb->data + DSA_HLEN, 2 * ETH_ALEN);
--
2.30.1
