This little number makes all of the flow dissection functions take
raw input data pointer as const (1-5) and shuffles the branches in
__skb_header_pointer() according to their hit probability.
The result is +20 Mbps per flow/core with one Flow Dissector pass
per packet. This affects RPS (with software hashing), drivers that
use eth_get_headlen() on their Rx path and so on.
Alexander Lobakin (6):
flow_dissector: constify bpf_flow_dissector's data pointers
skbuff: make __skb_header_pointer()'s data argument const
flow_dissector: constify raw input @data argument
linux/etherdevice.h: misc trailing whitespace cleanup
ethernet: constify eth_get_headlen()'s @data argument
skbuff: micro-optimize {,__}skb_header_pointer()
include/linux/etherdevice.h | 4 ++--
include/linux/skbuff.h | 26 +++++++++++------------
include/net/flow_dissector.h | 6 +++---
net/core/flow_dissector.c | 41 +++++++++++++++++++-----------------
net/ethernet/eth.c | 2 +-
5 files changed, 40 insertions(+), 39 deletions(-)
--
2.30.2
