target/linux/generic/backport-5.15/607-v5.18-net-skbuff-add-size-metadata-to-skb_shared_info-for-.patch

   1 commit d16697cb6261d4cc23422e6b1cb2759df8aa76d0
   2 Author: Lorenzo Bianconi <lorenzo@kernel.org>
   3 Date:   Fri Jan 21 11:09:44 2022 +0100
   4
   5     net: skbuff: add size metadata to skb_shared_info for xdp
   6
   7     Introduce xdp_frags_size field in skb_shared_info data structure
   8     to store xdp_buff/xdp_frame frame paged size (xdp_frags_size will
   9     be used in xdp frags support). In order to not increase
  10     skb_shared_info size we will use a hole due to skb_shared_info
  11     alignment.
  12
  13     Acked-by: Toke Hoiland-Jorgensen <toke@redhat.com>
  14     Acked-by: John Fastabend <john.fastabend@gmail.com>
  15     Acked-by: Jesper Dangaard Brouer <brouer@redhat.com>
  16     Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
  17     Link: https://lore.kernel.org/r/8a849819a3e0a143d540f78a3a5add76e17e980d.1642758637.git.lorenzo@kernel.org
  18     Signed-off-by: Alexei Starovoitov <ast@kernel.org>
  19
  20 --- a/include/linux/skbuff.h
  21 +++ b/include/linux/skbuff.h
  22 @@ -567,6 +567,7 @@ struct skb_shared_info {
  23          * Warning : all fields before dataref are cleared in __alloc_skb()
  24          */
  25         atomic_t        dataref;
  26 +       unsigned int    xdp_frags_size;
  27
  28         /* Intermediate layers must ensure that destructor_arg
  29          * remains valid until skb destructor */