In this series, we add skb drop reasons to the vxlan module. After the
commit 071c0fc6fb91 ("net: extend drop reasons for multiple subsystems"),
we can add the skb drop reasons as a subsystem.

So, we now add a new skb drop reason subsystem for vxlan. I'm not sure
if it is better to add them directly to enum skb_drop_reason, as there
are only 6 new drop reasons that we introduce for vxlan:

  VXLAN_DROP_FLAGS
  VXLAN_DROP_VNI
  VXLAN_DROP_MAC
  VXLAN_DROP_TXINFO
  VXLAN_DROP_REMOTE
  VXLAN_DROP_REMOTE_IP

And we add the "SKB_DROP_REASON_IP_TUNNEL_ECN" to enum skb_drop_reason,
as it not only belongs to vxlan subsystem.

In order to reset the reason to NOT_SPECIFIED if it is
SKB_NOT_DROPPED_YET, we introduce the SKB_DR_RESET() in the 2nd patch.
This is to make sure that the skb is indeed dropped.

Menglong Dong (10):
  net: vxlan: add vxlan to the drop reason subsystem
  net: skb: add SKB_DR_RESET
  net: skb: introduce pskb_network_may_pull_reason()
  net: ip: introduce pskb_inet_may_pull_reason()
  net: vxlan: make vxlan_remcsum() return skb drop reasons
  net: vxlan: add skb drop reasons to vxlan_rcv()
  net: vxlan: use vxlan_kfree_skb() in vxlan_xmit()
  net: vxlan: add drop reasons support to vxlan_xmit_one()
  net: vxlan: use kfree_skb_reason in vxlan_encap_bypass
  net: vxlan: use vxlan_kfree_skb in encap_bypass_if_local

 drivers/net/vxlan/drop.h          | 36 ++++++++++++
 drivers/net/vxlan/vxlan_core.c    | 91 +++++++++++++++++++++++--------
 drivers/net/vxlan/vxlan_private.h |  1 +
 include/linux/skbuff.h            |  8 ++-
 include/net/dropreason-core.h     |  7 +++
 include/net/dropreason.h          |  6 ++
 include/net/ip_tunnels.h          | 10 +++-
 7 files changed, 133 insertions(+), 26 deletions(-)
 create mode 100644 drivers/net/vxlan/drop.h

-- 
2.39.2