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

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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: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ido Schimmel 2021-03-24 22:14:23 +02:00 committed by David S. Miller
parent 03490a8239
commit 861584724c
1 changed files with 31 additions and 0 deletions
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31
tools/testing/selftests/drivers/net/mlxsw/devlink_trap_l3_exceptions.sh
View file

@ -446,6 +446,35 @@ __invalid_nexthop_test()
log_test "Unresolved neigh: nexthop does not exist: $desc" 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() unresolved_neigh_test()
{ {
__host_miss_test "IPv4" 198.51.100.1 __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 "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 \ __invalid_nexthop_test "IPv6" 2001:db8:2::1 2001:db8:2::3 64 \
2001:db8:2::4 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() vrf_without_routes_create()