ixgbe: about ixgbe_clean_rx_irq

hi:
     I  am  learning  the codes of  ixgbe-3.3.8,  and  i wonder why
the packet is invalid  in ixgbe_main.c:1645 ,
     and  if no RSC nor Packet Split  is  configured ,  we receive
larage packet that may span several descriptors and  buffers,  what
will the code do in this scene.

thanks !


1645    if (ixgbe_close_active_frag_list(skb) && !pkt_is_rsc) {
1646    /* if we got here without RSC the packet is invalid */
1647    dev_kfree_skb_any(skb);
1648    goto next_desc;
1649   }