To diagnose and prevent issues similar to [0], emit warning
(CONFIG_DEBUG_NET) from skb_dst_set and skb_dst_set_noref when
overwriting non-null reference-counted entry. Two new helpers
are added to handle special cases where the entry needs to be
reset and restored: skb_dstref_steal/skb_dstref_restore. The bulk of
the patches in the series converts manual _skb_refst manipulations
to these new helpers.

0: https://lore.kernel.org/netdev/20250723224625.1340224-1-sdf@fomichev.me/T/#u (local)

v2:
- rename to skb_dstref_steal/skb_dstref_restore (Jakub)
- fix kdoc (Jakub)

Stanislav Fomichev (7):
  net: Add skb_dstref_steal and skb_dstref_restore
  xfrm: Switch to skb_dstref_steal to clear dst_entry
  netfilter: Switch to skb_dstref_steal to clear dst_entry
  net: Switch to skb_dstref_steal/skb_dstref_restore for ip_route_input
    callers
  staging: octeon: Convert to skb_dst_drop
  chtls: Convert to skb_dst_reset
  net: Add skb_dst_check_unset

 .../chelsio/inline_crypto/chtls/chtls_cm.c    | 10 ++---
 .../chelsio/inline_crypto/chtls/chtls_cm.h    |  4 +-
 .../chelsio/inline_crypto/chtls/chtls_io.c    |  2 +-
 drivers/staging/octeon/ethernet-tx.c          |  3 +-
 include/linux/skbuff.h                        | 41 +++++++++++++++++++
 net/ipv4/icmp.c                               |  7 ++--
 net/ipv4/ip_options.c                         |  5 +--
 net/ipv4/netfilter.c                          |  5 ++-
 net/ipv6/netfilter.c                          |  5 ++-
 net/xfrm/xfrm_policy.c                        | 10 ++++-
 10 files changed, 72 insertions(+), 20 deletions(-)

-- 
2.50.1