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authorVladimir Oltean <vladimir.oltean@nxp.com>2020-11-01 21:16:19 +0200
committerJakub Kicinski <kuba@kernel.org>2020-11-02 17:41:16 -0800
commit9b9826ae117f211bcbdc75db844d5fd8b159fc59 (patch)
treefb5d15da24870d2acdec6bd53a49301f96767866 /net
parent952a06345015867e3bd37f8d9045fc1429637d43 (diff)
downloadlinux-9b9826ae117f211bcbdc75db844d5fd8b159fc59.tar.bz2
net: dsa: tag_gswip: 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. This one is interesting, the DSA tag is 8 bytes on RX and 4 bytes on TX. Because DSA is unaware of asymmetrical tag lengths, the overhead/needed headroom is declared as 8 bytes and therefore 4 bytes larger than it needs to be. If this becomes a problem, and the GSWIP driver can't be converted to a uniform header length, we might need to make DSA aware of separate RX/TX overhead values. Cc: Hauke Mehrtens <hauke@hauke-m.de> 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>
Diffstat (limited to 'net')
-rw-r--r--net/dsa/tag_gswip.c5
1 files changed, 0 insertions, 5 deletions
diff --git a/net/dsa/tag_gswip.c b/net/dsa/tag_gswip.c
index 408d4af390a0..2f5bd5e338ab 100644
--- a/net/dsa/tag_gswip.c
+++ b/net/dsa/tag_gswip.c
@@ -60,13 +60,8 @@ static struct sk_buff *gswip_tag_xmit(struct sk_buff *skb,
struct net_device *dev)
{
struct dsa_port *dp = dsa_slave_to_port(dev);
- int err;
u8 *gswip_tag;
- err = skb_cow_head(skb, GSWIP_TX_HEADER_LEN);
- if (err)
- return NULL;
-
skb_push(skb, GSWIP_TX_HEADER_LEN);
gswip_tag = skb->data;