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

   1 From d16697cb6261d4cc23422e6b1cb2759df8aa76d0 Mon Sep 17 00:00:00 2001
   2 From: Lorenzo Bianconi <lorenzo@kernel.org>
   3 Date: Fri, 21 Jan 2022 11:09:44 +0100
   4 Subject: [PATCH] net: skbuff: add size metadata to skb_shared_info for xdp
   5
   6 Introduce xdp_frags_size field in skb_shared_info data structure
   7 to store xdp_buff/xdp_frame frame paged size (xdp_frags_size will
   8 be used in xdp frags support). In order to not increase
   9 skb_shared_info size we will use a hole due to skb_shared_info
  10 alignment.
  11
  12 Acked-by: Toke Hoiland-Jorgensen <toke@redhat.com>
  13 Acked-by: John Fastabend <john.fastabend@gmail.com>
  14 Acked-by: Jesper Dangaard Brouer <brouer@redhat.com>
  15 Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
  16 Link: https://lore.kernel.org/r/8a849819a3e0a143d540f78a3a5add76e17e980d.1642758637.git.lorenzo@kernel.org
  17 Signed-off-by: Alexei Starovoitov <ast@kernel.org>
  18 ---
  19  include/linux/skbuff.h | 1 +
  20  1 file changed, 1 insertion(+)
  21
  22 --- a/include/linux/skbuff.h
  23 +++ b/include/linux/skbuff.h
  24 @@ -568,6 +568,7 @@ struct skb_shared_info {
  25          * Warning : all fields before dataref are cleared in __alloc_skb()
  26          */
  27         atomic_t        dataref;
  28 +       unsigned int    xdp_frags_size;
  29
  30         /* Intermediate layers must ensure that destructor_arg
  31          * remains valid until skb destructor */