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authorSriram Yagnaraman <sriram.yagnaraman@est.tech>2023-08-31 11:03:30 +0300
committerDavid S. Miller <davem@davemloft.net>2023-09-01 10:11:51 +0300
commit6ac66cb03ae306c2e288a9be18226310529f5b25 (patch)
tree94c8e872d5c3db3244773688c23fc9b0686e4496 /net
parent2ea35288c83b3d501a88bc17f2df8f176b5cc96f (diff)
downloadlinux-6ac66cb03ae306c2e288a9be18226310529f5b25.tar.xz
ipv4: ignore dst hint for multipath routes
Route hints when the nexthop is part of a multipath group causes packets in the same receive batch to be sent to the same nexthop irrespective of the multipath hash of the packet. So, do not extract route hint for packets whose destination is part of a multipath group. A new SKB flag IPSKB_MULTIPATH is introduced for this purpose, set the flag when route is looked up in ip_mkroute_input() and use it in ip_extract_route_hint() to check for the existence of the flag. Fixes: 02b24941619f ("ipv4: use dst hint for ipv4 list receive") Signed-off-by: Sriram Yagnaraman <sriram.yagnaraman@est.tech> Reviewed-by: Ido Schimmel <idosch@nvidia.com> Reviewed-by: David Ahern <dsahern@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/ipv4/ip_input.c3
-rw-r--r--net/ipv4/route.c1
2 files changed, 3 insertions, 1 deletions
diff --git a/net/ipv4/ip_input.c b/net/ipv4/ip_input.c
index fe9ead9ee863..5e9c8156656a 100644
--- a/net/ipv4/ip_input.c
+++ b/net/ipv4/ip_input.c
@@ -584,7 +584,8 @@ static void ip_sublist_rcv_finish(struct list_head *head)
static struct sk_buff *ip_extract_route_hint(const struct net *net,
struct sk_buff *skb, int rt_type)
{
- if (fib4_has_custom_rules(net) || rt_type == RTN_BROADCAST)
+ if (fib4_has_custom_rules(net) || rt_type == RTN_BROADCAST ||
+ IPCB(skb)->flags & IPSKB_MULTIPATH)
return NULL;
return skb;
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index a4e153dd615b..6a3f57a3fa41 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -2144,6 +2144,7 @@ static int ip_mkroute_input(struct sk_buff *skb,
int h = fib_multipath_hash(res->fi->fib_net, NULL, skb, hkeys);
fib_select_multipath(res, h);
+ IPCB(skb)->flags |= IPSKB_MULTIPATH;
}
#endif