[PATCH net-next v5 0/6] net: gro: encapsulation bug fix and flush checks improvements

[Richard Gobert]

This series fixes a bug in the complete phase of UDP in GRO, in which
socket lookup fails due to using network_header when parsing encapsulated
packets. The fix is to pass p_off parameter in *_gro_complete.

Next, the fields network_offset and inner_network_offset are added to
napi_gro_cb, and are both set during the receive phase of GRO. This is then
leveraged in the next commit to remove flush_id state from napi_gro_cb, and
stateful code in {ipv6,inet}_gro_receive which may be unnecessarily
complicated due to encapsulation support in GRO.

In addition, udpgro_fwd selftest is adjusted to include the socket lookup
case for vxlan. This selftest will test its supposed functionality once
local bind support is merged (https://lore.kernel.org/netdev/df300a49-7811-4126-a56a-a77100c8841b@xxxxxxxxx/).

v4 -> v5:
 - Add 1st commit - flush id checks in udp_gro_receive segment which can be
   backported by itself
 - Add TCP measurements for the 5th commit
 - Add flush id tests to ensure flush id logic is preserved in GRO
 - Simplify gro_inet_flush by removing a branch
 - v4:
   https://lore.kernel.org/all/20240325182543.87683-1-richardbgobert@xxxxxxxxx/

v3 -> v4:
 - Fix code comment and commit message typos
 - v3:
   https://lore.kernel.org/all/f939c84a-2322-4393-a5b0-9b1e0be8ed8e@xxxxxxxxx/

v2 -> v3:
 - Use napi_gro_cb instead of skb->{offset}
 - v2:
   https://lore.kernel.org/all/2ce1600b-e733-448b-91ac-9d0ae2b866a4@xxxxxxxxx/

v1 -> v2:
 - Pass p_off in *_gro_complete to fix UDP bug
 - Remove more conditionals and memory fetches from inet_gro_flush
 - v1:
   https://lore.kernel.org/netdev/e1d22505-c5f8-4c02-a997-64248480338b@xxxxxxxxx/

Richard Gobert (6):
  net: gro: add flush check in udp_gro_receive_segment
  net: gro: add p_off param in *_gro_complete
  selftests/net: add local address bind in vxlan selftest
  net: gro: add {inner_}network_offset to napi_gro_cb
  net: gro: move L3 flush checks to tcp_gro_receive
  selftests/net: add flush id selftests

 drivers/net/geneve.c                      |   7 +-
 drivers/net/vxlan/vxlan_core.c            |  11 +-
 include/linux/etherdevice.h               |   2 +-
 include/linux/netdevice.h                 |   3 +-
 include/linux/udp.h                       |   2 +-
 include/net/gro.h                         |  93 ++++++++++++--
 include/net/inet_common.h                 |   2 +-
 include/net/tcp.h                         |   6 +-
 include/net/udp.h                         |   8 +-
 include/net/udp_tunnel.h                  |   2 +-
 net/8021q/vlan_core.c                     |   6 +-
 net/core/gro.c                            |   7 +-
 net/ethernet/eth.c                        |   5 +-
 net/ipv4/af_inet.c                        |  54 +-------
 net/ipv4/fou_core.c                       |   9 +-
 net/ipv4/gre_offload.c                    |   6 +-
 net/ipv4/tcp_offload.c                    |  22 +---
 net/ipv4/udp.c                            |   3 +-
 net/ipv4/udp_offload.c                    |  31 +++--
 net/ipv6/ip6_offload.c                    |  41 +++---
 net/ipv6/tcpv6_offload.c                  |   7 +-
 net/ipv6/udp.c                            |   3 +-
 net/ipv6/udp_offload.c                    |  13 +-
 tools/testing/selftests/net/gro.c         | 144 ++++++++++++++++++++++
 tools/testing/selftests/net/udpgro_fwd.sh |  10 +-
 25 files changed, 336 insertions(+), 161 deletions(-)

-- 
2.36.1