3 # Send data between two processes across namespaces
4 # Run twice: once without and once with zerocopy
10 readonly BIN_TX="./io_uring_zerocopy_tx"
11 readonly BIN_RX="./msg_zerocopy"
13 readonly RAND="$(mktemp -u XXXXXX)"
14 readonly NSPREFIX="ns-${RAND}"
15 readonly NS1="${NSPREFIX}1"
16 readonly NS2="${NSPREFIX}2"
18 readonly SADDR4='192.168.1.1'
19 readonly DADDR4='192.168.1.2'
20 readonly SADDR6='fd::1'
21 readonly DADDR6='fd::2'
23 readonly path_sysctl_mem="net.core.optmem_max"
25 # No arguments: automated test
26 if [[ "$#" -eq "0" ]]; then
29 for IP in "${IPs[@]}"; do
30 for mode in $(seq 1 3); do
31 $0 "$IP" udp -m "$mode" -t 1 -n 32
32 $0 "$IP" tcp -m "$mode" -t 1 -n 1
36 echo "OK. All tests passed"
41 if [[ "$#" -lt "2" ]]; then
42 echo "Usage: $0 [4|6] [tcp|udp|raw|raw_hdrincl|packet|packet_dgram] <args>"
50 readonly EXTRA_ARGS="$@"
52 # Argument parsing: configure addresses
53 if [[ "${IP}" == "4" ]]; then
54 readonly SADDR="${SADDR4}"
55 readonly DADDR="${DADDR4}"
56 elif [[ "${IP}" == "6" ]]; then
57 readonly SADDR="${SADDR6}"
58 readonly DADDR="${DADDR6}"
60 echo "Invalid IP version ${IP}"
64 # Argument parsing: select receive mode
66 # This differs from send mode for
67 # - packet: use raw recv, because packet receives skb clones
68 # - raw_hdrinc: use raw recv, because hdrincl is a tx-only option
70 'packet' | 'packet_dgram' | 'raw_hdrincl')
78 # Start of state changes: install cleanup handler
79 save_sysctl_mem="$(sysctl -n ${path_sysctl_mem})"
84 sysctl -w -q "${path_sysctl_mem}=${save_sysctl_mem}"
89 # Configure system settings
90 sysctl -w -q "${path_sysctl_mem}=1000000"
92 # Create virtual ethernet pair between network namespaces
96 ip link add "${DEV}" mtu "${DEV_MTU}" netns "${NS1}" type veth \
97 peer name "${DEV}" mtu "${DEV_MTU}" netns "${NS2}"
99 # Bring the devices up
100 ip -netns "${NS1}" link set "${DEV}" up
101 ip -netns "${NS2}" link set "${DEV}" up
103 # Set fixed MAC addresses on the devices
104 ip -netns "${NS1}" link set dev "${DEV}" address 02:02:02:02:02:02
105 ip -netns "${NS2}" link set dev "${DEV}" address 06:06:06:06:06:06
107 # Add fixed IP addresses to the devices
108 ip -netns "${NS1}" addr add 192.168.1.1/24 dev "${DEV}"
109 ip -netns "${NS2}" addr add 192.168.1.2/24 dev "${DEV}"
110 ip -netns "${NS1}" addr add fd::1/64 dev "${DEV}" nodad
111 ip -netns "${NS2}" addr add fd::2/64 dev "${DEV}" nodad
113 # Optionally disable sg or csum offload to test edge cases
114 # ip netns exec "${NS1}" ethtool -K "${DEV}" sg off
117 local readonly ARGS="$1"
119 echo "ipv${IP} ${TXMODE} ${ARGS}"
120 ip netns exec "${NS2}" "${BIN_RX}" "-${IP}" -t 2 -C 2 -S "${SADDR}" -D "${DADDR}" -r "${RXMODE}" &
122 ip netns exec "${NS1}" "${BIN_TX}" "-${IP}" -t 1 -D "${DADDR}" ${ARGS} "${TXMODE}"
126 do_test "${EXTRA_ARGS}"