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    Subject[PATCH 4.19 100/114] net/dst: add new function skb_dst_update_pmtu_no_confirm
    Date
    From: Hangbin Liu <liuhangbin@gmail.com>

    [ Upstream commit 07dc35c6e3cc3c001915d05f5bf21f80a39a0970 ]

    Add a new function skb_dst_update_pmtu_no_confirm() for callers who need
    update pmtu but should not do neighbor confirm.

    v5: No change.
    v4: No change.
    v3: Do not remove dst_confirm_neigh, but add a new bool parameter in
    dst_ops.update_pmtu to control whether we should do neighbor confirm.
    Also split the big patch to small ones for each area.
    v2: Remove dst_confirm_neigh in __ip6_rt_update_pmtu.

    Reviewed-by: Guillaume Nault <gnault@redhat.com>
    Acked-by: David Ahern <dsahern@gmail.com>
    Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
    Signed-off-by: David S. Miller <davem@davemloft.net>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    include/net/dst.h | 9 +++++++++
    1 file changed, 9 insertions(+)

    --- a/include/net/dst.h
    +++ b/include/net/dst.h
    @@ -530,6 +530,15 @@ static inline void skb_dst_update_pmtu(s
    dst->ops->update_pmtu(dst, NULL, skb, mtu, true);
    }

    +/* update dst pmtu but not do neighbor confirm */
    +static inline void skb_dst_update_pmtu_no_confirm(struct sk_buff *skb, u32 mtu)
    +{
    + struct dst_entry *dst = skb_dst(skb);
    +
    + if (dst && dst->ops->update_pmtu)
    + dst->ops->update_pmtu(dst, NULL, skb, mtu, false);
    +}
    +
    static inline void skb_tunnel_check_pmtu(struct sk_buff *skb,
    struct dst_entry *encap_dst,
    int headroom)

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