226. vhost 1023 ethports test plan

This test plan test function of launch vhost with 1023 ethports. Note: Because the value of MAX_FDS is 1024 and there is an extra gobal fd, the number of vdev is limit to 1023. So when vhost-user ports number > 1023, it will report an error “failed to add listen fd”.

226.1. Test Case1: Basic test for launch vhost with 1023 ethports

1. SW preparation: change “CONFIG_RTE_MAX_ETHPORTS” to 1023 in DPDK configure file:

   vi ./config/common_base
   -CONFIG_RTE_MAX_ETHPORTS=32
   +CONFIG_RTE_MAX_ETHPORTS=1023
   

2. Launch vhost with 1023 vdev:

   ./testpmd -c 0x3000 -n 4 --file-prefix=vhost --vdev 'eth_vhost0,iface=vhost-net,queues=1' \
   --vdev 'eth_vhost1,iface=vhost-net1,queues=1' ... -- -i # only list two vdev, here ommit other 1021 vdevs, from eth_vhost2 to eth_vhost1022
   

3. Change “CONFIG_RTE_MAX_ETHPORTS” back to 32 in DPDK configure file:

   vi ./config/common_base
   +CONFIG_RTE_MAX_ETHPORTS=32
   -CONFIG_RTE_MAX_ETHPORTS=1023