From 72a338bcc6ae51e01c95d687e5d775e3fe52eff1 Mon Sep 17 00:00:00 2001 From: Paolo Abeni Date: Fri, 4 May 2018 11:32:59 +0200 Subject: net: core: rework basic flow dissection helper When the core networking needs to detect the transport offset in a given packet and parse it explicitly, a full-blown flow_keys struct is used for storage. This patch introduces a smaller keys store, rework the basic flow dissect helper to use it, and apply this new helper where possible - namely in skb_probe_transport_header(). The used flow dissector data structures are renamed to match more closely the new role. The above gives ~50% performance improvement in micro benchmarking around skb_probe_transport_header() and ~30% around eth_get_headlen(), mostly due to the smaller memset. Small, but measurable improvement is measured also in macro benchmarking. v1 -> v2: use the new helper in eth_get_headlen() and skb_get_poff(), as per DaveM suggestion Suggested-by: David Miller Signed-off-by: Paolo Abeni Signed-off-by: David S. Miller --- net/ethernet/eth.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) (limited to 'net/ethernet') diff --git a/net/ethernet/eth.c b/net/ethernet/eth.c index eaeba9b99a73..ee28440f57c5 100644 --- a/net/ethernet/eth.c +++ b/net/ethernet/eth.c @@ -128,15 +128,15 @@ u32 eth_get_headlen(void *data, unsigned int len) { const unsigned int flags = FLOW_DISSECTOR_F_PARSE_1ST_FRAG; const struct ethhdr *eth = (const struct ethhdr *)data; - struct flow_keys keys; + struct flow_keys_basic keys; /* this should never happen, but better safe than sorry */ if (unlikely(len < sizeof(*eth))) return len; /* parse any remaining L2/L3 headers, check for L4 */ - if (!skb_flow_dissect_flow_keys_buf(&keys, data, eth->h_proto, - sizeof(*eth), len, flags)) + if (!skb_flow_dissect_flow_keys_basic(NULL, &keys, data, eth->h_proto, + sizeof(*eth), len, flags)) return max_t(u32, keys.control.thoff, sizeof(*eth)); /* parse for any L4 headers */ -- cgit