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net: dsa: tag_dsa: let DSA core deal with TX reallocation

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[ 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@nxp.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Vladimir Oltean 2020-11-01 21:16:18 +02:00 committed by Greg Kroah-Hartman
parent 9ad635b75e
commit 9bb1bec952
1 changed files with 0 additions and 5 deletions
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5
net/dsa/tag_dsa.c
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@ -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);