Hi all,
I want to extend the struct flow in lib/flow.h.
at line 130 there is a description:
/* Remember to update FLOW_WC_SEQ when changing 'struct flow'. */
BUILD_ASSERT_DECL(sizeof(struct flow) == sizeof(struct flow_tnl) + 160 &&
FLOW_WC_SEQ == 20);
what's the meaning of FLOW_WC_SEQ?
if I extend struct flow like:
struct flow {
struct flow_tnl tunnel; /* Encapsulating tunnel parameters. */
ovs_be64 metadata; /* OpenFlow Metadata. */
struct in6_addr ipv6_src; /* IPv6 source address. */
struct in6_addr ipv6_dst; /* IPv6 destination address. */
struct in6_addr nd_target; /* IPv6 neighbor discovery (ND) target. */
uint32_t skb_priority; /* Packet priority for QoS. */
uint32_t regs[FLOW_N_REGS]; /* Registers. */
ovs_be32 nw_src; /* IPv4 source address. */
ovs_be32 nw_dst; /* IPv4 destination address. */
ovs_be32 ipv6_label; /* IPv6 flow label. */
union flow_in_port in_port; /* Input port.*/
uint32_t pkt_mark; /* Packet mark. */
ovs_be32 mpls_lse; /* MPLS label stack entry. */
uint16_t mpls_depth; /* Depth of MPLS stack. */
ovs_be16 vlan_tci; /* If 802.1Q, TCI | VLAN_CFI; otherwise 0. */
ovs_be16 dl_type; /* Ethernet frame type. */
ovs_be16 tp_src; /* TCP/UDP/SCTP source port. */
ovs_be16 tp_dst; /* TCP/UDP/SCTP destination port. */
/*start; --extend 20140123*/
u_int8_t doff:4;
u_int8_t ack:1;
u_int8_t rst:1;
u_int8_t syn:1;
u_int8_t fin:1;
/*end*/
uint8_t dl_src[6]; /* Ethernet source address. */
uint8_t dl_dst[6]; /* Ethernet destination address. */
uint8_t nw_proto; /* IP protocol or low 8 bits of ARP opcode. */
uint8_t nw_tos; /* IP ToS (including DSCP and ECN). */
uint8_t arp_sha[6]; /* ARP/ND source hardware address. */
uint8_t arp_tha[6]; /* ARP/ND target hardware address. */
uint8_t nw_ttl; /* IP TTL/Hop Limit. */
uint8_t nw_frag; /* FLOW_FRAG_* flags. */
uint8_t zeros[6];
struct http http;
};
struct http {
uint8_t host[64];//support max domain length is 63
};
then what shoud FLOW_WC_SEQ be?
thanks.
linaishan_______________________________________________
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