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Date: Wed, 12 Nov 2014 11:15:07 -0800
From: Pravin Shelar <pshelar@...ira.com>
To: Jiri Pirko <jiri@...nulli.us>
Cc: netdev <netdev@...r.kernel.org>,
David Miller <davem@...emloft.net>,
Jamal Hadi Salim <jhs@...atatu.com>,
Tom Herbert <therbert@...gle.com>,
Eric Dumazet <edumazet@...gle.com>,
Willem de Bruijn <willemb@...gle.com>,
Daniel Borkmann <dborkman@...hat.com>, mst@...hat.com,
fw@...len.de, Paul.Durrant@...rix.com, Thomas Graf <tgraf@...g.ch>
Subject: Re: [patch net-next v2 2/4] net: move make_writable helper into
common code
On Wed, Nov 12, 2014 at 6:52 AM, Jiri Pirko <jiri@...nulli.us> wrote:
> 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>
Looks good.
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 749a301..04c9680 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;
>
> @@ -308,7 +297,7 @@ 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;
>
> @@ -410,8 +399,8 @@ 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;
>
> @@ -448,8 +437,8 @@ 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;
>
> @@ -491,7 +480,7 @@ 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)
> {
> @@ -521,8 +510,8 @@ 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;
>
> @@ -546,8 +535,8 @@ 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;
>
> @@ -572,7 +561,7 @@ 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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