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userspace: Add support for NSH MD1 match fields

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This patch adds support for NSH packet header fields to the OVS
control plane and the userspace datapath. Initially we support the
fields of the NSH base header as defined in
https://www.ietf.org/id/draft-ietf-sfc-nsh-13.txt
and the fixed context headers specified for metadata format MD1.
The variable length MD2 format is parsed but the TLV context headers
are not yet available for matching.

The NSH fields are modelled as experimenter fields with the dedicated
experimenter class 0x005ad650 proposed for NSH in ONF. The following
fields are defined:

NXOXM code            ofctl name    Size      Comment
=====================================================================
NXOXM_NSH_FLAGS       nsh_flags       8       Bits 2-9 of 1st NSH word
(0x005ad650,1)
NXOXM_NSH_MDTYPE      nsh_mdtype      8       Bits 16-23
(0x005ad650,2)
NXOXM_NSH_NEXTPROTO   nsh_np          8       Bits 24-31
(0x005ad650,3)
NXOXM_NSH_SPI         nsh_spi         24      Bits 0-23 of 2nd NSH word
(0x005ad650,4)
NXOXM_NSH_SI          nsh_si          8       Bits 24-31
(0x005ad650,5)
NXOXM_NSH_C1          nsh_c1          32      Maskable, nsh_mdtype==1
(0x005ad650,6)
NXOXM_NSH_C2          nsh_c2          32      Maskable, nsh_mdtype==1
(0x005ad650,7)
NXOXM_NSH_C3          nsh_c3          32      Maskable, nsh_mdtype==1
(0x005ad650,8)
NXOXM_NSH_C4          nsh_c4          32      Maskable, nsh_mdtype==1
(0x005ad650,9)

Co-authored-by: Johnson Li <johnson.li@intel.com>
Signed-off-by: Yi Yang <yi.y.yang@intel.com>
Signed-off-by: Jan Scheurich <jan.scheurich@ericsson.com>
Signed-off-by: Ben Pfaff <blp@ovn.org>
This commit is contained in:
Jan Scheurich
2017-08-05 13:41:08 +08:00
committed by Ben Pfaff
parent 05f282c2e1
commit 3d2fbd70bd
24 changed files with 984 additions and 27 deletions
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3
lib/flow.h
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@@ -129,6 +129,7 @@ bool flow_compose(struct dp_packet *, const struct flow *, size_t);
bool parse_ipv6_ext_hdrs(const void **datap, size_t *sizep, uint8_t *nw_proto,
uint8_t *nw_frag);
ovs_be16 parse_dl_type(const struct eth_header *data_, size_t size);
bool parse_nsh(const void **datap, size_t *sizep, struct flow_nsh *key);
static inline uint64_t
flow_get_xreg(const struct flow *flow, int idx)
@@ -914,7 +915,7 @@ static inline void
pkt_metadata_from_flow(struct pkt_metadata *md, const struct flow *flow)
{
/* Update this function whenever struct flow changes. */
BUILD_ASSERT_DECL(FLOW_WC_SEQ == 39);
BUILD_ASSERT_DECL(FLOW_WC_SEQ == 40);
md->recirc_id = flow->recirc_id;
md->dp_hash = flow->dp_hash;