[dpdk-dev] question about PKT_RX_IPV4_HDR_EXT
ivan.boule at 6wind.com
Mon Jan 6 16:27:04 CET 2014
On 12/26/2013 10:46 PM, Wang, Shawn wrote:
> 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
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
dedicated flag into the RX descriptor where they store the packet.
Then, to supply this hardware-detected packet characteristics to the
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.
6WIND Development Engineer
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