On 12/26/2013 10:46 PM, Wang, Shawn wrote: > Hi: > > Can anyone explain more details about the rte_mbuf ol_flag : > PKT_RX_IPV4_HDR_EXT? > The document said ?RX packet with extended IPv4 header.? > But what is the extended IPv4 header looks like? What is the difference with > normal IPv4 header? > Can anyone give me an example? > > Thanks a lot. > Wang, Shawn Hi,
A extended IPv4 header is a IPv4 header with additional options, whose total header size is greater than 20 bytes. Intel 1GbE and 10Gbe Ethernet controllers are able to recognize such packets, and, in this case,set a dedicated flag into the RX descriptor where they store the packet. Then, to supply this hardware-detected packet characteristics to the upper-level application, the RX functions of DPDK PollMode Drivers of the 1GbE and 10Gbe Ethernet controllers set the PKT_RX_IPV4_HDR_EXT generic flag into the mbuf that contains the packet. Best regards, Ivan -- Ivan Boule 6WIND Development Engineer
