Let's try that again. I managed to mess up Maciej's commit message.

This small set consists of two patches from Maciej and myself which
are optimizing the XSKMAP lookups.  In the first patch, the sockets
are moved to be stored at the tail of the struct xsk_map. The second
patch, Maciej implements map_gen_lookup() for XSKMAP.

Based on the XDP program from tools/lib/bpf/xsk.c where
bpf_map_lookup_elem() is explicitly called, this work yields a 5%
improvement for xdpsock's rxdrop scenario.

Cheers,
Björn and Maciej

v1->v2: * Change size/cost to size_t and use {struct, array}_size
          where appropriate. (Jakub)
v2->v3: * Proper commit message for patch 2.

Björn Töpel (1):
  xsk: store struct xdp_sock as a flexible array member of the XSKMAP

Maciej Fijalkowski (1):
  bpf: implement map_gen_lookup() callback for XSKMAP

 kernel/bpf/xskmap.c | 72 +++++++++++++++++++++++++--------------------
 1 file changed, 40 insertions(+), 32 deletions(-)

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2.20.1