| Message ID | 20201101191620.589272-9-vladimir.oltean@nxp.com (mailing list archive) |
|---|---|
| State | Not Applicable |
| Delegated to: | Netdev Maintainers |
| Headers | show |
| Series | Generic TX reallocation for DSA | expand |
On 11/1/2020 11:16 AM, Vladimir Oltean wrote: > 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. > > Note that the VLAN code path needs a smaller extra headroom than the > regular EtherType DSA path. That isn't a problem, because this tagger > declares the larger tag length (8 bytes vs 4) as the protocol overhead, > so we are covered in both cases. > > Cc: Andrew Lunn <andrew@lunn.ch> > Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
diff --git a/net/dsa/tag_edsa.c b/net/dsa/tag_edsa.c index 120614240319..abf70a29deb4 100644 --- a/net/dsa/tag_edsa.c +++ b/net/dsa/tag_edsa.c @@ -35,8 +35,6 @@ static struct sk_buff *edsa_xmit(struct sk_buff *skb, struct net_device *dev) * current ethertype field if the packet is untagged. */ if (skb->protocol == htons(ETH_P_8021Q)) { - 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); @@ -60,8 +58,6 @@ static struct sk_buff *edsa_xmit(struct sk_buff *skb, struct net_device *dev) edsa_header[6] &= ~0x10; } } else { - if (skb_cow_head(skb, EDSA_HLEN) < 0) - return NULL; skb_push(skb, EDSA_HLEN); memmove(skb->data, skb->data + EDSA_HLEN, 2 * ETH_ALEN);
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. Note that the VLAN code path needs a smaller extra headroom than the regular EtherType DSA path. That isn't a problem, because this tagger declares the larger tag length (8 bytes vs 4) as the protocol overhead, so we are covered in both cases. Cc: Andrew Lunn <andrew@lunn.ch> Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> --- Changes in v3: None. Changes in v2: None. net/dsa/tag_edsa.c | 4 ---- 1 file changed, 4 deletions(-)