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Allow adding tc filter for PFCP header. Add support for parsing TCA_FLOWER_KEY_ENC_OPTS_PFCP. Options are as follows: TYPE:SEID. TYPE is a 8-bit value represented in hex and can be 1 for session header and 0 for node header. In PFCP packet this is S flag in header. SEID is a 64-bit session id value represented in hex. This patch enables adding hardware filters using PFCP fields, see [1]. [1] https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git/commit/?id=d823265dd45bbf14bd67aa476057108feb4143ce Signed-off-by: Michal Swiatkowski <michal.swiatkowski@linux.intel.com> Signed-off-by: Wojciech Drewek <wojciech.drewek@intel.com> Signed-off-by: David Ahern <dsahern@kernel.org>