dev_gro_receive() uses indirect calls for IP GRO functions, but it works only for the outermost headers and untagged frames. Simple VLAN tag before an IP header restores the performance hit. This simple series straightens the GRO calls for IP headers going after VLAN tag or inner Ethernet header (GENEVE, NvGRE, VxLAN) for retpolined kernels.
Alexander Lobakin (4): gro: make net/gro.h self-contained gro: add combined call_gro_receive() + INDIRECT_CALL_INET() helper vlan/8021q: avoid retpoline overhead on GRO ethernet: avoid retpoline overhead on TEB (GENEVE, NvGRE, VxLAN) GRO include/net/gro.h | 13 +++++++++++++ net/8021q/vlan_core.c | 10 ++++++++-- net/ethernet/eth.c | 11 ++++++++--- 3 files changed, 29 insertions(+), 5 deletions(-) -- 2.31.0
