diff options
| author | Radu Pirea (NXP OSS) <radu-nicolae.pirea@oss.nxp.com> | 2023-12-19 16:53:25 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2023-12-27 13:08:09 +0000 |
| commit | 90abde49ea85a8af9a56bbab8c419aefc77f919a (patch) | |
| tree | 627fe2cf982a3ab5915883c83109614e7d8a3204 /net/core | |
| parent | c2b2ee36250d967c21890cb801e24af4b6a9eaa5 (diff) | |
net: rename dsa_realloc_skb to skb_ensure_writable_head_tail
Rename dsa_realloc_skb to skb_ensure_writable_head_tail and move it to
skbuff.c to use it as helper.
Signed-off-by: Radu Pirea (NXP OSS) <radu-nicolae.pirea@oss.nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core')
| -rw-r--r-- | net/core/skbuff.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/net/core/skbuff.c b/net/core/skbuff.c index ce5687ddb768..12d22c0b8551 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -5995,6 +5995,31 @@ int skb_ensure_writable(struct sk_buff *skb, unsigned int write_len) } EXPORT_SYMBOL(skb_ensure_writable); +int skb_ensure_writable_head_tail(struct sk_buff *skb, struct net_device *dev) +{ + int needed_headroom = dev->needed_headroom; + int needed_tailroom = dev->needed_tailroom; + + /* For tail taggers, we need to pad short frames ourselves, to ensure + * that the tail tag does not fail at its role of being at the end of + * the packet, once the conduit interface pads the frame. Account for + * that pad length here, and pad later. + */ + if (unlikely(needed_tailroom && skb->len < ETH_ZLEN)) + needed_tailroom += ETH_ZLEN - skb->len; + /* skb_headroom() returns unsigned int... */ + needed_headroom = max_t(int, needed_headroom - skb_headroom(skb), 0); + needed_tailroom = max_t(int, needed_tailroom - skb_tailroom(skb), 0); + + if (likely(!needed_headroom && !needed_tailroom && !skb_cloned(skb))) + /* No reallocation needed, yay! */ + return 0; + + return pskb_expand_head(skb, needed_headroom, needed_tailroom, + GFP_ATOMIC); +} +EXPORT_SYMBOL(skb_ensure_writable_head_tail); + /* remove VLAN header from packet and update csum accordingly. * expects a non skb_vlan_tag_present skb with a vlan tag payload */ |