About struct in C

something new:

to set value in struct can be

in case i cannot view picture.. i write the snippet here ..

static struct rte_eth_conf port_conf = {
    .rxmode = {
        .mq_mode = ETH_MQ_RX_NONE,
        .max_rx_pkt_len = ETHER_MAX_LEN,
        .split_hdr_size = ,
        .header_split = , /**< Header Split disabled */
        .hw_ip_checksum = , /**<IP checksum offload enabled */
        .hw_vlan_filter = , /**<VLAN filtering disabled */
        .jumbo_frame = , /**<Jumbo Frame Support disabled */
        .hw_strip_crc = , /**<CRC strip by hardware */
    },
    .rx_adv_conf = {
        .rss_conf = {
            .rss_key = NULL,
            .rss_hf = ETH_RSS_IP,
        },
    },
    .txmode = {
        .mq_mode = ETH_MQ_TX_NONE
    },
};

the dot punctuation means the member of the struct, that being used, member can be assigned without accordance to its order.