gdb打印DPDK mbuf

gdb打印mbuf的方法：

vim ~/.gdbinit

handle SIGPIPE nostop noprint

define pmbuf

    set $m = (struct rte_mbuf *)$arg0

    printf "dump mbuf at %p, buf_addr:%p, buf_len=%hu, data_off=%u\n", $m, $m->buf_addr, $m->buf_len, $m->data_off

    printf "data_len=%hu, pkt_len=%d\n", $m->data_len, $m->pkt_len

    printf "ol_flags=0x%x, nb_segs=%u\n", $m->ol_flags, $m->nb_segs

    while $m

        set $data_len = $m->data_len

        set $data = $m->buf_addr + $m->data_off

        dump binary memory /tmp/dump.bin $data $data+$data_len

        shell hexdump -n 100 -C /tmp/dump.bin

        set $m = $m->next

    end

end

document pmbuf

    print mbuf

    usage: pmbuf batch->packets[0]

end

打印出的内容如下：

image.png

将数据部分保存到txt文件，打开wireshark，文件-> 从Hex转储导入既可

image.png