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 # Argument parsing
  25 if [[ "$#" -lt "2" ]]; then
  26         echo "Usage: $0 [4|6] [tcp|udp|raw|raw_hdrincl|packet|packet_dgram] <args>"
  27         exit 1
  28 fi
  29
  30 readonly IP="$1"
  31 shift
  32 readonly TXMODE="$1"
  33 shift
  34 readonly EXTRA_ARGS="$@"
  35
  36 # Argument parsing: configure addresses
  37 if [[ "${IP}" == "4" ]]; then
  38         readonly SADDR="${SADDR4}"
  39         readonly DADDR="${DADDR4}"
  40 elif [[ "${IP}" == "6" ]]; then
  41         readonly SADDR="${SADDR6}"
  42         readonly DADDR="${DADDR6}"
  43 else
  44         echo "Invalid IP version ${IP}"
  45         exit 1
  46 fi
  47
  48 # Argument parsing: select receive mode
  49 #
  50 # This differs from send mode for
  51 # - packet:     use raw recv, because packet receives skb clones
  52 # - raw_hdrinc: use raw recv, because hdrincl is a tx-only option
  53 case "${TXMODE}" in
  54 'packet' | 'packet_dgram' | 'raw_hdrincl')
  55         RXMODE='raw'
  56         ;;
  57 *)
  58         RXMODE="${TXMODE}"
  59         ;;
  60 esac
  61
  62 # Start of state changes: install cleanup handler
  63 save_sysctl_mem="$(sysctl -n ${path_sysctl_mem})"
  64
  65 cleanup() {
  66         ip netns del "${NS2}"
  67         ip netns del "${NS1}"
  68         sysctl -w -q "${path_sysctl_mem}=${save_sysctl_mem}"
  69 }
  70
  71 trap cleanup EXIT
  72
  73 # Configure system settings
  74 sysctl -w -q "${path_sysctl_mem}=1000000"
  75
  76 # Create virtual ethernet pair between network namespaces
  77 ip netns add "${NS1}"
  78 ip netns add "${NS2}"
  79
  80 ip link add "${DEV}" mtu "${DEV_MTU}" netns "${NS1}" type veth \
  81   peer name "${DEV}" mtu "${DEV_MTU}" netns "${NS2}"
  82
  83 # Bring the devices up
  84 ip -netns "${NS1}" link set "${DEV}" up
  85 ip -netns "${NS2}" link set "${DEV}" up
  86
  87 # Set fixed MAC addresses on the devices
  88 ip -netns "${NS1}" link set dev "${DEV}" address 02:02:02:02:02:02
  89 ip -netns "${NS2}" link set dev "${DEV}" address 06:06:06:06:06:06
  90
  91 # Add fixed IP addresses to the devices
  92 ip -netns "${NS1}" addr add 192.168.1.1/24 dev "${DEV}"
  93 ip -netns "${NS2}" addr add 192.168.1.2/24 dev "${DEV}"
  94 ip -netns "${NS1}" addr add       fd::1/64 dev "${DEV}" nodad
  95 ip -netns "${NS2}" addr add       fd::2/64 dev "${DEV}" nodad
  96
  97 # Optionally disable sg or csum offload to test edge cases
  98 # ip netns exec "${NS1}" ethtool -K "${DEV}" sg off
  99
 100 do_test() {
 101         local readonly ARGS="$1"
 102
 103         echo "ipv${IP} ${TXMODE} ${ARGS}"
 104         ip netns exec "${NS2}" "${BIN}" "-${IP}" -i "${DEV}" -t 2 -C 2 -S "${SADDR}" -D "${DADDR}" ${ARGS} -r "${RXMODE}" &
 105         sleep 0.2
 106         ip netns exec "${NS1}" "${BIN}" "-${IP}" -i "${DEV}" -t 1 -C 3 -S "${SADDR}" -D "${DADDR}" ${ARGS} "${TXMODE}"
 107         wait
 108 }
 109
 110 do_test "${EXTRA_ARGS}"
 111 do_test "-z ${EXTRA_ARGS}"
 112 echo ok