From ec7127a5d53d891b77a11433026dca72c57eaf88 Mon Sep 17 00:00:00 2001 From: David Ahern Date: Fri, 2 Mar 2018 08:32:14 -0800 Subject: [PATCH] net/ipv4: Simplify fib_multipath_hash with optional flow keys As of commit e37b1e978bec5 ("ipv6: route: dissect flow in input path if fib rules need it") fib_multipath_hash takes an optional flow keys. If non-NULL it means the skb has already been dissected. If not set, then fib_multipath_hash needs to call skb_flow_dissect_flow_keys. Simplify the logic by setting flkeys to the local stack variable keys. Simplifies fib_multipath_hash by only have 1 set of instructions setting hash_keys. Signed-off-by: David Ahern Reviewed-by: Ido Schimmel Reviewed-by: Nikolay Aleksandrov Signed-off-by: David S. Miller --- net/ipv4/route.c | 24 ++++++++++-------------- 1 file changed, 10 insertions(+), 14 deletions(-) diff --git a/net/ipv4/route.c b/net/ipv4/route.c index df57bc68e8e0..6a7b3cba3972 100644 --- a/net/ipv4/route.c +++ b/net/ipv4/route.c @@ -1810,24 +1810,20 @@ int fib_multipath_hash(const struct net *net, const struct flowi4 *fl4, /* short-circuit if we already have L4 hash present */ if (skb->l4_hash) return skb_get_hash_raw(skb) >> 1; + memset(&hash_keys, 0, sizeof(hash_keys)); - if (flkeys) { - hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; - hash_keys.addrs.v4addrs.src = flkeys->addrs.v4addrs.src; - hash_keys.addrs.v4addrs.dst = flkeys->addrs.v4addrs.dst; - hash_keys.ports.src = flkeys->ports.src; - hash_keys.ports.dst = flkeys->ports.dst; - hash_keys.basic.ip_proto = flkeys->basic.ip_proto; - } else { + if (!flkeys) { skb_flow_dissect_flow_keys(skb, &keys, flag); - hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; - hash_keys.addrs.v4addrs.src = keys.addrs.v4addrs.src; - hash_keys.addrs.v4addrs.dst = keys.addrs.v4addrs.dst; - hash_keys.ports.src = keys.ports.src; - hash_keys.ports.dst = keys.ports.dst; - hash_keys.basic.ip_proto = keys.basic.ip_proto; + flkeys = &keys; } + + hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; + hash_keys.addrs.v4addrs.src = flkeys->addrs.v4addrs.src; + hash_keys.addrs.v4addrs.dst = flkeys->addrs.v4addrs.dst; + hash_keys.ports.src = flkeys->ports.src; + hash_keys.ports.dst = flkeys->ports.dst; + hash_keys.basic.ip_proto = flkeys->basic.ip_proto; } else { memset(&hash_keys, 0, sizeof(hash_keys)); hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;