linux.git/tools/testing/selftests/net/forwarding/mirror_lib.sh, branch v5.8

selftests: forwarding: mirror_lib: Use mausezahn

2020-05-31T04:48:24+00:00

Using ping in tests is error-prone, because ping is too smart. On a
flaky system (notably in a simulator), when packets don't come quickly
enough, more pings are sent, and that throws off counters. Instead use
mausezahn to generate ICMP echo request packets. That allows us to
send them in quicker succession as well, because the reason the ping
was made slow in the first place was to make the tests work on
simulated systems.

Signed-off-by: Petr Machata 
Signed-off-by: Ido Schimmel 
Signed-off-by: David S. Miller

selftests: forwarding: mirror_lib: Wait for tardy mirrored packets

2019-02-01T23:26:36+00:00

When running in an environment with poor performance (such as a
simulator), processing mirrored packets can take a while. Evaluating the
condition too soon leads to spurious "seen 9, expected 10" failures as
the last packet doesn't have enough time to get mirrored and the mirror
to arrive and bump the observed counters.

Wait for one ping interval before evaluating the test.

Signed-off-by: Petr Machata 
Signed-off-by: David S. Miller

selftests: forwarding: mirror_lib: Update ping limits

2019-02-01T23:26:36+00:00

The current ping intervals are too short for running mirroring tests in
simulator. This leads to ping sending a follow-up ping before the reply
arrives, thus sending more than the requested 10 ICMP requests. Those
are mirrored, and over a certain threshold the test case run is
considered a failure, because too much traffic is observed.

Bump interval and timeout numbers 5x in mirroring tests to address the
spurious failures.

Signed-off-by: Petr Machata 
Signed-off-by: David S. Miller

selftests: forwarding: Make ping timeout configurable

2019-02-01T23:26:36+00:00

The current timeout (2 seconds) proved to be too low for some (emulated)
systems where we run the tests.

Make the timeout configurable and default to 5 seconds.

Signed-off-by: Ido Schimmel 
Signed-off-by: Petr Machata 
Signed-off-by: David S. Miller

selftests: forwarding: mirror_lib: Tighten up VLAN capture

2018-07-11T05:58:10+00:00

The function do_test_span_vlan_dir_ips() is used for testing whether
mirrored packets are VLAN-encapsulated. But since it only considers
VLAN encapsulation, it may end up matching unmirrored ARP traffic as
well. One consequence is a rare failure of mirror_gre_vlan_bridge_1q's
test_gretap_untagged_egress. Decreasing ping cadence in mirror_test()
makes the problem easily reproducible.

Therefore tighten up the match criterion to only count those 802.1q
packets where the next header is IP.

Signed-off-by: Petr Machata 
Signed-off-by: David S. Miller

selftests: forwarding: mirror_lib: skip_hw the VLAN capture

2018-06-01T18:11:02+00:00

When the VLAN capture is installed on a front panel device and not a
soft device, the packets are counted twice: once in fast path, and once
after they are trapped to the kernel. Resolve the problem by passing
skip_hw flag to vlan_capture_install().

Signed-off-by: Petr Machata 
Signed-off-by: David S. Miller

selftests: forwarding: mirror_lib: Move here do_test_span_vlan_dir_ips()

2018-06-01T18:11:01+00:00

Move the function do_test_span_vlan_dir_ips() from mirror_vlan.sh test
to a library file mirror_lib.sh to allow reuse. Fill in other entry
points similar to other testing functions in mirror_lib.sh, they will be
useful in following patches.

Signed-off-by: Petr Machata 
Signed-off-by: David S. Miller

selftests: forwarding: mirror_gre_lib: Extract generic functions

2018-05-25T02:26:19+00:00

For non-GRE mirroring tests, a functions along the lines of
do_test_span_gre_dir_ips() and test_span_gre_dir_ips() are necessary,
but such that they don't assume tunnels are involved. Extract the code
from mirror_gre_lib.sh to mirror_lib.sh and convert to just use a given
device without assuming it's named "h3-$tundev". Convert the two
above-mentioned functions to wrappers that pass along the correct device
name.

Add test_span_dir() and fail_test_span_dir() to round up the API for use
by following patches.

Signed-off-by: Petr Machata 
Signed-off-by: David S. Miller

selftests: forwarding: Add libs for gretap mirror testing

2018-04-27T18:57:49+00:00

To simplify implementation of mirror-to-gretap tests, extend lib.sh with
several new functions that might potentially be useful more
broadly (although right now the mirroring tests will be the only
client).

Also add mirror_lib.sh with code useful for mirroring tests,
mirror_gre_lib.sh with code specifically useful for mirror-to-gretap
tests, and mirror_gre_topo.sh that primes a given test with a good
baseline topology that the test can then tweak to its liking.

Signed-off-by: Petr Machata 
Reviewed-by: Jiri Pirko 
Signed-off-by: David S. Miller