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selftests: forwarding: lib: Avoid trapping soft devices

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There are several cases where traffic that would normally be forwarded
in silicon needs to be observed in slow path. That's achieved by
trapping such traffic, and the functions trap_install() and
trap_uninstall() realize that. However, such treatment is obviously
wrong if the device in question is actually a soft device not backed by
an ASIC.

Therefore try to trap if possible, but fall back to inserting a continue
if not.

Signed-off-by: Petr Machata <petrm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Petr Machata 2018-06-28 18:56:28 +02:00 committed by David S. Miller
parent 010079bac0
commit ac0fcadf03
1 changed files with 12 additions and 4 deletions
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16
tools/testing/selftests/net/forwarding/lib.sh
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@ -479,9 +479,15 @@ trap_install()
local dev=$1; shift
local direction=$1; shift
# For slow-path testing, we need to install a trap to get to
# slow path the packets that would otherwise be switched in HW.
tc filter add dev $dev $direction pref 1 flower skip_sw action trap
# Some devices may not support or need in-hardware trapping of traffic
# (e.g. the veth pairs that this library creates for non-existent
# loopbacks). Use continue instead, so that there is a filter in there
# (some tests check counters), and so that other filters are still
# processed.
tc filter add dev $dev $direction pref 1 \
flower skip_sw action trap 2>/dev/null \
|| tc filter add dev $dev $direction pref 1 \
flower action continue
}
trap_uninstall()
@ -489,11 +495,13 @@ trap_uninstall()
local dev=$1; shift
local direction=$1; shift
tc filter del dev $dev $direction pref 1 flower skip_sw
tc filter del dev $dev $direction pref 1 flower
}
slow_path_trap_install()
{
# For slow-path testing, we need to install a trap to get to
# slow path the packets that would otherwise be switched in HW.
if [ "${tcflags/skip_hw}" != "$tcflags" ]; then
trap_install "$@"
fi