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Date: Wed, 19 Nov 2014 14:05:01 +0100
From: Jiri Pirko <jiri@...nulli.us>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net, jhs@...atatu.com, pshelar@...ira.com,
therbert@...gle.com, edumazet@...gle.com, willemb@...gle.com,
dborkman@...hat.com, mst@...hat.com, fw@...len.de,
Paul.Durrant@...rix.com, tgraf@...g.ch, cwang@...pensource.com
Subject: [patch net-next v4 7/9] net: move make_writable helper into common code
note that skb_make_writable already exists in net/netfilter/core.c
but does something slightly different.
Suggested-by: Eric Dumazet <eric.dumazet@...il.com>
Signed-off-by: Jiri Pirko <jiri@...nulli.us>
Acked-by: Pravin B Shelar <pshelar@...ira.com>
---
include/linux/skbuff.h | 1 +
net/core/skbuff.c | 12 ++++++++++++
net/openvswitch/actions.c | 39 ++++++++++++++-------------------------
3 files changed, 27 insertions(+), 25 deletions(-)
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 73c370e..e045516 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -2678,6 +2678,7 @@ void skb_scrub_packet(struct sk_buff *skb, bool xnet);
unsigned int skb_gso_transport_seglen(const struct sk_buff *skb);
struct sk_buff *skb_segment(struct sk_buff *skb, netdev_features_t features);
struct sk_buff *skb_vlan_untag(struct sk_buff *skb);
+int skb_ensure_writable(struct sk_buff *skb, int write_len);
struct skb_checksum_ops {
__wsum (*update)(const void *mem, int len, __wsum wsum);
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 7001896..d11bbe0 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -4151,6 +4151,18 @@ err_free:
}
EXPORT_SYMBOL(skb_vlan_untag);
+int skb_ensure_writable(struct sk_buff *skb, int write_len)
+{
+ if (!pskb_may_pull(skb, write_len))
+ return -ENOMEM;
+
+ if (!skb_cloned(skb) || skb_clone_writable(skb, write_len))
+ return 0;
+
+ return pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
+}
+EXPORT_SYMBOL(skb_ensure_writable);
+
/**
* alloc_skb_with_frags - allocate skb with page frags
*
diff --git a/net/openvswitch/actions.c b/net/openvswitch/actions.c
index 426b913..7ffa377 100644
--- a/net/openvswitch/actions.c
+++ b/net/openvswitch/actions.c
@@ -119,17 +119,6 @@ static bool is_flow_key_valid(const struct sw_flow_key *key)
return !!key->eth.type;
}
-static int make_writable(struct sk_buff *skb, int write_len)
-{
- if (!pskb_may_pull(skb, write_len))
- return -ENOMEM;
-
- if (!skb_cloned(skb) || skb_clone_writable(skb, write_len))
- return 0;
-
- return pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
-}
-
static int push_mpls(struct sk_buff *skb, struct sw_flow_key *key,
const struct ovs_action_push_mpls *mpls)
{
@@ -171,7 +160,7 @@ static int pop_mpls(struct sk_buff *skb, struct sw_flow_key *key,
struct ethhdr *hdr;
int err;
- err = make_writable(skb, skb->mac_len + MPLS_HLEN);
+ err = skb_ensure_writable(skb, skb->mac_len + MPLS_HLEN);
if (unlikely(err))
return err;
@@ -201,7 +190,7 @@ static int set_mpls(struct sk_buff *skb, struct sw_flow_key *key,
__be32 *stack;
int err;
- err = make_writable(skb, skb->mac_len + MPLS_HLEN);
+ err = skb_ensure_writable(skb, skb->mac_len + MPLS_HLEN);
if (unlikely(err))
return err;
@@ -223,7 +212,7 @@ static int __pop_vlan_tci(struct sk_buff *skb, __be16 *current_tci)
struct vlan_hdr *vhdr;
int err;
- err = make_writable(skb, VLAN_ETH_HLEN);
+ err = skb_ensure_writable(skb, VLAN_ETH_HLEN);
if (unlikely(err))
return err;
@@ -310,7 +299,7 @@ static int set_eth_addr(struct sk_buff *skb, struct sw_flow_key *key,
const struct ovs_key_ethernet *eth_key)
{
int err;
- err = make_writable(skb, ETH_HLEN);
+ err = skb_ensure_writable(skb, ETH_HLEN);
if (unlikely(err))
return err;
@@ -412,8 +401,8 @@ static int set_ipv4(struct sk_buff *skb, struct sw_flow_key *key,
struct iphdr *nh;
int err;
- err = make_writable(skb, skb_network_offset(skb) +
- sizeof(struct iphdr));
+ err = skb_ensure_writable(skb, skb_network_offset(skb) +
+ sizeof(struct iphdr));
if (unlikely(err))
return err;
@@ -450,8 +439,8 @@ static int set_ipv6(struct sk_buff *skb, struct sw_flow_key *key,
__be32 *saddr;
__be32 *daddr;
- err = make_writable(skb, skb_network_offset(skb) +
- sizeof(struct ipv6hdr));
+ err = skb_ensure_writable(skb, skb_network_offset(skb) +
+ sizeof(struct ipv6hdr));
if (unlikely(err))
return err;
@@ -493,7 +482,7 @@ static int set_ipv6(struct sk_buff *skb, struct sw_flow_key *key,
return 0;
}
-/* Must follow make_writable() since that can move the skb data. */
+/* Must follow skb_ensure_writable() since that can move the skb data. */
static void set_tp_port(struct sk_buff *skb, __be16 *port,
__be16 new_port, __sum16 *check)
{
@@ -523,8 +512,8 @@ static int set_udp(struct sk_buff *skb, struct sw_flow_key *key,
struct udphdr *uh;
int err;
- err = make_writable(skb, skb_transport_offset(skb) +
- sizeof(struct udphdr));
+ err = skb_ensure_writable(skb, skb_transport_offset(skb) +
+ sizeof(struct udphdr));
if (unlikely(err))
return err;
@@ -548,8 +537,8 @@ static int set_tcp(struct sk_buff *skb, struct sw_flow_key *key,
struct tcphdr *th;
int err;
- err = make_writable(skb, skb_transport_offset(skb) +
- sizeof(struct tcphdr));
+ err = skb_ensure_writable(skb, skb_transport_offset(skb) +
+ sizeof(struct tcphdr));
if (unlikely(err))
return err;
@@ -574,7 +563,7 @@ static int set_sctp(struct sk_buff *skb, struct sw_flow_key *key,
int err;
unsigned int sctphoff = skb_transport_offset(skb);
- err = make_writable(skb, sctphoff + sizeof(struct sctphdr));
+ err = skb_ensure_writable(skb, sctphoff + sizeof(struct sctphdr));
if (unlikely(err))
return err;
--
1.9.3
--
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