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    Subject[PATCH 3.5 34/62] net: add and use skb_gso_transport_seglen()
    Date
    3.5.7.32 -stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Florian Westphal <fw@strlen.de>

    commit de960aa9ab4decc3304959f69533eef64d05d8e8 upstream.

    This moves part of Eric Dumazets skb_gso_seglen helper from tbf sched to
    skbuff core so it may be reused by upcoming ip forwarding path patch.

    Signed-off-by: Florian Westphal <fw@strlen.de>
    Acked-by: Eric Dumazet <edumazet@google.com>
    Signed-off-by: David S. Miller <davem@davemloft.net>
    [ luis: backported to 3.5: used davem's backport to 3.4:
    - no skb_gso_seglen helper in 3.4, leave tbf alone ]
    Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
    ---
    include/linux/skbuff.h | 2 ++
    net/core/skbuff.c | 25 +++++++++++++++++++++++++
    2 files changed, 27 insertions(+)

    diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
    index 160f3ea..0d40dda 100644
    --- a/include/linux/skbuff.h
    +++ b/include/linux/skbuff.h
    @@ -2171,6 +2171,8 @@ extern int skb_shift(struct sk_buff *tgt, struct sk_buff *skb,
    extern struct sk_buff *skb_segment(struct sk_buff *skb,
    netdev_features_t features);

    +unsigned int skb_gso_transport_seglen(const struct sk_buff *skb);
    +
    static inline void *skb_header_pointer(const struct sk_buff *skb, int offset,
    int len, void *buffer)
    {
    diff --git a/net/core/skbuff.c b/net/core/skbuff.c
    index 1e37e1a..50f7c96 100644
    --- a/net/core/skbuff.c
    +++ b/net/core/skbuff.c
    @@ -47,6 +47,8 @@
    #include <linux/in.h>
    #include <linux/inet.h>
    #include <linux/slab.h>
    +#include <linux/tcp.h>
    +#include <linux/udp.h>
    #include <linux/netdevice.h>
    #ifdef CONFIG_NET_CLS_ACT
    #include <net/pkt_sched.h>
    @@ -3358,3 +3360,26 @@ bool skb_try_coalesce(struct sk_buff *to, struct sk_buff *from,
    return true;
    }
    EXPORT_SYMBOL(skb_try_coalesce);
    +
    +/**
    + * skb_gso_transport_seglen - Return length of individual segments of a gso packet
    + *
    + * @skb: GSO skb
    + *
    + * skb_gso_transport_seglen is used to determine the real size of the
    + * individual segments, including Layer4 headers (TCP/UDP).
    + *
    + * The MAC/L2 or network (IP, IPv6) headers are not accounted for.
    + */
    +unsigned int skb_gso_transport_seglen(const struct sk_buff *skb)
    +{
    + const struct skb_shared_info *shinfo = skb_shinfo(skb);
    + unsigned int hdr_len;
    +
    + if (likely(shinfo->gso_type & (SKB_GSO_TCPV4 | SKB_GSO_TCPV6)))
    + hdr_len = tcp_hdrlen(skb);
    + else
    + hdr_len = sizeof(struct udphdr);
    + return hdr_len + shinfo->gso_size;
    +}
    +EXPORT_SYMBOL_GPL(skb_gso_transport_seglen);
    --
    1.9.0


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