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struct ip_hdr: split u16_t _ttl_proto to u8_t _ttl and u8_t _proto to prevent unnecessary loading and htons

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This commit is contained in:
goldsimon 2010-02-14 11:42:08 +00:00
parent c858aa5686
commit 838c35acf6
2 changed files with 10 additions and 8 deletions
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3
src/core/ipv4/ip.c
View File

@ -555,7 +555,8 @@ err_t ip_output_if_opt(struct pbuf *p, ip_addr_t *src, ip_addr_t *dest,
LWIP_ASSERT("check that first pbuf can hold struct ip_hdr",
(p->len >= sizeof(struct ip_hdr)));
IPH_TTL_PROTO_SET(iphdr, ttl, proto);
IPH_TTL_SET(iphdr, ttl);
IPH_PROTO_SET(iphdr, proto);
ip_addr_set(&(iphdr->dest), dest);

15
src/include/ipv4/lwip/ip.h
View File

@ -123,8 +123,10 @@ struct ip_hdr {
#define IP_DF 0x4000 /* dont fragment flag */
#define IP_MF 0x2000 /* more fragments flag */
#define IP_OFFMASK 0x1fff /* mask for fragmenting bits */
/* time to live / protocol*/
PACK_STRUCT_FIELD(u16_t _ttl_proto);
/* time to live */
PACK_STRUCT_FIELD(u8_t _ttl);
/* protocol*/
PACK_STRUCT_FIELD(u8_t _proto);
/* checksum */
PACK_STRUCT_FIELD(u16_t _chksum);
/* source and destination IP addresses */
@ -142,17 +144,16 @@ PACK_STRUCT_END
#define IPH_LEN(hdr) ((hdr)->_len)
#define IPH_ID(hdr) ((hdr)->_id)
#define IPH_OFFSET(hdr) ((hdr)->_offset)
#define IPH_TTL(hdr) (ntohs((hdr)->_ttl_proto) >> 8)
#define IPH_PROTO(hdr) (ntohs((hdr)->_ttl_proto) & 0xff)
#define IPH_TTL(hdr) ((hdr)->_ttl)
#define IPH_PROTO(hdr) ((hdr)->_proto)
#define IPH_CHKSUM(hdr) ((hdr)->_chksum)
#define IPH_VHLTOS_SET(hdr, v, hl, tos) (hdr)->_v_hl_tos = (htons(((v) << 12) | ((hl) << 8) | (tos)))
#define IPH_LEN_SET(hdr, len) (hdr)->_len = (len)
#define IPH_ID_SET(hdr, id) (hdr)->_id = (id)
#define IPH_OFFSET_SET(hdr, off) (hdr)->_offset = (off)
#define IPH_TTL_PROTO_SET(hdr, ttl, proto) (hdr)->_ttl_proto = (htons((u8_t)(proto) | ((u16_t)(ttl) << 8)))
#define IPH_TTL_SET(hdr, ttl) (hdr)->_ttl_proto = (htons(IPH_PROTO(hdr) | ((u16_t)(ttl) << 8)))
#define IPH_PROTO_SET(hdr, proto) (hdr)->_ttl_proto = (htons((proto) | (IPH_TTL(hdr) << 8)))
#define IPH_TTL_SET(hdr, ttl) (hdr)->_ttl = (u8_t)(ttl)
#define IPH_PROTO_SET(hdr, proto) (hdr)->_proto = (u8_t)(proto)
#define IPH_CHKSUM_SET(hdr, chksum) (hdr)->_chksum = (chksum)
/** The interface that provided the packet for the current callback invocation. */