? Perfect-mac-vlan match filters. The hardware checks a match between the masked fields
of the received packets and the programmed filters. The masked fields are for MAC VLAN
flow.
? Perfect-tunnel match filters. The hardware checks a match between the masked fields of
the received packets and the programmed filters. The masked fields are for tunnel flow.
testpmd测试过程
执行./testpmd -c0xff -n4 -- -i --portmask=0x3
执行flow_director_filter 0 mode IP add flow ipv4-other src 2.2.2.3 dst 3.3.3.5 tos 20 proto 20 ttl 40 vlan 0x01 flexbytes (0x88,0x48) fwd pf queue 1 fd_id 1
show port fdir 0
testpmd测试硬件cksum计算
执行./testpmd -c0xff -n4 -- -i --portmask=0x3
cfe和legarea更改了相关的checksum计算后结果不正确，调查后原因时：
要实现硬件tx checksum offload，除了需要再pkt_mbuf中将对应的标识位置上，并准备相应的环境，还需要在网卡初始化的时候，手工将tx_flags清零。因为默认网卡是不支持硬件offload的。
rte_eth_dev_info_get(portid, &dev_info);
txconf = &dev_info.default_txconf;
txconf->txq_flags = 0;