From 952a06345015867e3bd37f8d9045fc1429637d43 Mon Sep 17 00:00:00 2001 From: Vladimir Oltean Date: Sun, 1 Nov 2020 21:16:18 +0200 Subject: net: dsa: tag_dsa: let DSA core deal with TX reallocation 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 Reviewed-by: Florian Fainelli Signed-off-by: Jakub Kicinski --- net/dsa/tag_dsa.c | 5 ----- 1 file changed, 5 deletions(-) (limited to 'net/dsa/tag_dsa.c') 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); -- cgit