Re: [PATCH net-next V3 0/3] net: Add GRO support for UDP encapsulating protocols

On 14/01/2014 18:00, Or Gerlitz wrote:

This series adds GRO handlers for protocols that do UDP encapsulation, with the
intent of being able to coalesce packets which encapsulate packets belonging to
the same TCP session.

For GRO purposes, the destination UDP port takes the role of the ether type
field in the ethernet header or the next protocol in the IP header.

The UDP GRO handler will only attempt to coalesce packets whose destination
port is registered to have gro handler.

The patches done against net-next ae237b3ede64 "net: 3com: fix
warning for incorrect type in argument"

Or.


v3 --> v4 changes:

   - applied feedback from Tom on some micro-optimizations that save
     branches and goto directives in the udp gro logic

  - applied feedback from Eric on correct RCU programming for the
    add/remove flow of the upper protocols udp gro handlers


v2 --> v3 changes:

  - moved to use linked list to store the udp gro handlers, this solves the
    problem of consuming 512KB of memory for the handlers.

  - use a mark on the skb GRO CB data to disallow running the udp gro_receive twice
    on a packet, this solves the problem of udp encapsulated packets whose inner VM
    packet is udp and happen to carry a port which has registered offloads - and flush it.

  - invoke the udp offload protocol registration and de-registration from the vxlan driver
    in a sleepable context

For unclear some reason I got this warning when the vxlan driver deletes the
udp offload structure
*** BLURB HERE ***

Sorry for the spam, the above three lines are leftovers from the V3 
cover letter, same for the subject line of this
cover-letter which carries "V3" this *is* V4, will make sure to avoid 
such flushes (....) in the future.

Or.

Or Gerlitz (3):
   net: Add GRO support for UDP encapsulating protocols
   net: Export gro_find_by_type helpers
   net: Add GRO support for vxlan traffic

  drivers/net/vxlan.c       |  117 +++++++++++++++++++++++++++++++--
  include/linux/netdevice.h |   10 +++-
  include/net/protocol.h    |    3 +
  include/net/vxlan.h       |    1 +
  net/core/dev.c            |    3 +
  net/ipv4/udp_offload.c    |  157 +++++++++++++++++++++++++++++++++++++++++++++
  6 files changed, 283 insertions(+), 8 deletions(-)