tools/testing/selftests/net/msg_zerocopy.sh

   1 #!/bin/bash
   2 #
   3 # Send data between two processes across namespaces
   4 # Run twice: once without and once with zerocopy
   5
   6 set -e
   7
   8 readonly DEV="veth0"
   9 readonly DEV_MTU=65535
  10 readonly BIN="./msg_zerocopy"
  11
  12 readonly RAND="$(mktemp -u XXXXXX)"
  13 readonly NSPREFIX="ns-${RAND}"
  14 readonly NS1="${NSPREFIX}1"
  15 readonly NS2="${NSPREFIX}2"
  16
  17 readonly SADDR4='192.168.1.1'
  18 readonly DADDR4='192.168.1.2'
  19 readonly SADDR6='fd::1'
  20 readonly DADDR6='fd::2'
  21
  22 readonly path_sysctl_mem="net.core.optmem_max"
  23
  24 # No arguments: automated test
  25 if [[ "$#" -eq "0" ]]; then
  26         $0 4 tcp -t 1
  27         $0 6 tcp -t 1
  28         echo "OK. All tests passed"
  29         exit 0
  30 fi
  31
  32 # Argument parsing
  33 if [[ "$#" -lt "2" ]]; then
  34         echo "Usage: $0 [4|6] [tcp|udp|raw|raw_hdrincl|packet|packet_dgram] <args>"
  35         exit 1
  36 fi
  37
  38 readonly IP="$1"
  39 shift
  40 readonly TXMODE="$1"
  41 shift
  42 readonly EXTRA_ARGS="$@"
  43
  44 # Argument parsing: configure addresses
  45 if [[ "${IP}" == "4" ]]; then
  46         readonly SADDR="${SADDR4}"
  47         readonly DADDR="${DADDR4}"
  48 elif [[ "${IP}" == "6" ]]; then
  49         readonly SADDR="${SADDR6}"
  50         readonly DADDR="${DADDR6}"
  51 else
  52         echo "Invalid IP version ${IP}"
  53         exit 1
  54 fi
  55
  56 # Argument parsing: select receive mode
  57 #
  58 # This differs from send mode for
  59 # - packet:     use raw recv, because packet receives skb clones
  60 # - raw_hdrinc: use raw recv, because hdrincl is a tx-only option
  61 case "${TXMODE}" in
  62 'packet' | 'packet_dgram' | 'raw_hdrincl')
  63         RXMODE='raw'
  64         ;;
  65 *)
  66         RXMODE="${TXMODE}"
  67         ;;
  68 esac
  69
  70 # Start of state changes: install cleanup handler
  71 save_sysctl_mem="$(sysctl -n ${path_sysctl_mem})"
  72
  73 cleanup() {
  74         ip netns del "${NS2}"
  75         ip netns del "${NS1}"
  76         sysctl -w -q "${path_sysctl_mem}=${save_sysctl_mem}"
  77 }
  78
  79 trap cleanup EXIT
  80
  81 # Configure system settings
  82 sysctl -w -q "${path_sysctl_mem}=1000000"
  83
  84 # Create virtual ethernet pair between network namespaces
  85 ip netns add "${NS1}"
  86 ip netns add "${NS2}"
  87
  88 ip link add "${DEV}" mtu "${DEV_MTU}" netns "${NS1}" type veth \
  89   peer name "${DEV}" mtu "${DEV_MTU}" netns "${NS2}"
  90
  91 # Bring the devices up
  92 ip -netns "${NS1}" link set "${DEV}" up
  93 ip -netns "${NS2}" link set "${DEV}" up
  94
  95 # Set fixed MAC addresses on the devices
  96 ip -netns "${NS1}" link set dev "${DEV}" address 02:02:02:02:02:02
  97 ip -netns "${NS2}" link set dev "${DEV}" address 06:06:06:06:06:06
  98
  99 # Add fixed IP addresses to the devices
 100 ip -netns "${NS1}" addr add 192.168.1.1/24 dev "${DEV}"
 101 ip -netns "${NS2}" addr add 192.168.1.2/24 dev "${DEV}"
 102 ip -netns "${NS1}" addr add       fd::1/64 dev "${DEV}" nodad
 103 ip -netns "${NS2}" addr add       fd::2/64 dev "${DEV}" nodad
 104
 105 # Optionally disable sg or csum offload to test edge cases
 106 # ip netns exec "${NS1}" ethtool -K "${DEV}" sg off
 107
 108 do_test() {
 109         local readonly ARGS="$1"
 110
 111         echo "ipv${IP} ${TXMODE} ${ARGS}"
 112         ip netns exec "${NS2}" "${BIN}" "-${IP}" -i "${DEV}" -t 2 -C 2 -S "${SADDR}" -D "${DADDR}" ${ARGS} -r "${RXMODE}" &
 113         sleep 0.2
 114         ip netns exec "${NS1}" "${BIN}" "-${IP}" -i "${DEV}" -t 1 -C 3 -S "${SADDR}" -D "${DADDR}" ${ARGS} "${TXMODE}"
 115         wait
 116 }
 117
 118 do_test "${EXTRA_ARGS}"
 119 do_test "-z ${EXTRA_ARGS}"
 120 echo ok