selftests/net: add csum offload test

Test NIC hardware checksum offload: - Rx + Tx - IPv4 + IPv6 - TCP + UDP Optional features: - zero checksum 0xFFFF - checksum disable 0x0000 - transport encap headers - randomization See file header for detailed comments. Expected results differ depending on NIC features: - CHECKSUM_UNNECESSARY vs CHECKSUM_COMPLETE - NETIF_F_HW_CSUM (csum_start/csum_off) vs NETIF_F_IP(V6)_CSUM Signed-off-by: Willem de Bruijn <willemb@google.com> Link: https://lore.kernel.org/r/20221128140210.553391-1-willemdebruijn.kernel@gmail.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
mariux64 · Nov 30, 2022 · 91a7de8 · 91a7de8
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diff --git a/tools/testing/selftests/net/.gitignore b/tools/testing/selftests/net/.gitignore
@@ -1,5 +1,6 @@
 # SPDX-License-Identifier: GPL-2.0-only
 bind_bhash
+csum
 cmsg_sender
 fin_ack_lat
 gro

diff --git a/tools/testing/selftests/net/Makefile b/tools/testing/selftests/net/Makefile
@@ -74,6 +74,7 @@ TEST_PROGS += test_ingress_egress_chaining.sh
 TEST_GEN_PROGS += so_incoming_cpu
 TEST_PROGS += sctp_vrf.sh
 TEST_GEN_FILES += sctp_hello
+TEST_GEN_FILES += csum
 
 TEST_FILES := settings