Commit 86158472 authored by Ido Schimmel's avatar Ido Schimmel Committed by David S. Miller
Browse files

selftests: mlxsw: Test unresolved neigh trap with resilient nexthop groups 



The number of nexthop buckets in a resilient nexthop group never
changes, so when the gateway address of a nexthop cannot be resolved,
the nexthop buckets are programmed to trap packets to the CPU in order
to trigger resolution. For example:

 # ip nexthop add id 1 via 198.51.100.1 dev swp3
 # ip nexthop add id 10 group 1 type resilient buckets 32
 # ip nexthop bucket get id 10 index 0
 id 10 index 0 idle_time 1.44 nhid 1 trap

Where 198.51.100.1 is a made-up IP.

Test that in this case packets are indeed trapped to the CPU via the
unresolved neigh trap.

Signed-off-by: default avatarIdo Schimmel <idosch@nvidia.com>
Reviewed-by: default avatarPetr Machata <petrm@nvidia.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 03490a82

tools/testing/selftests/drivers/net/mlxsw/devlink_trap_l3_exceptions.sh

+31 −0
Original line number Diff line number Diff line
@@ -446,6 +446,35 @@ __invalid_nexthop_test() 
	log_test "Unresolved neigh: nexthop does not exist: $desc"

}



__invalid_nexthop_bucket_test()

{

	local desc=$1; shift

	local dip=$1; shift

	local via_add=$1; shift

	local trap_name="unresolved_neigh"



	RET=0



	# Check that route to nexthop that does not exist triggers

	# unresolved_neigh

	ip nexthop add id 1 via $via_add dev $rp2

	ip nexthop add id 10 group 1 type resilient buckets 32

	ip route add $dip nhid 10



	t0_packets=$(devlink_trap_rx_packets_get $trap_name)

	ping_do $h1 $dip

	t1_packets=$(devlink_trap_rx_packets_get $trap_name)



	if [[ $t0_packets -eq $t1_packets ]]; then

		check_err 1 "Trap counter did not increase"

	fi



	ip route del $dip nhid 10

	ip nexthop del id 10

	ip nexthop del id 1

	log_test "Unresolved neigh: nexthop bucket does not exist: $desc"

}



unresolved_neigh_test()

{

	__host_miss_test "IPv4" 198.51.100.1
@@ -453,6 +482,8 @@ unresolved_neigh_test() 
	__invalid_nexthop_test "IPv4" 198.51.100.1 198.51.100.3 24 198.51.100.4

	__invalid_nexthop_test "IPv6" 2001:db8:2::1 2001:db8:2::3 64 \

		2001:db8:2::4

	__invalid_nexthop_bucket_test "IPv4" 198.51.100.1 198.51.100.4

	__invalid_nexthop_bucket_test "IPv6" 2001:db8:2::1 2001:db8:2::4

}



vrf_without_routes_create()