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Draft: xdp: checksum optimization #22

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Draft: xdp: checksum optimization #22

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a10b01f
xdp: checksum optimization
vjardin Feb 20, 2024
af25457
checksum: no need to initialize to 0
vjardin Feb 20, 2024
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8 changes: 4 additions & 4 deletions src/bpf/gtp_fwd.c
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Original file line number Diff line number Diff line change
Expand Up @@ -202,15 +202,15 @@ gtpu_ipencap(struct parse_pkt *pkt, struct gtp_iptnl_rule *iptnl_rule)
static __always_inline void
gtpu_xlat_iph(struct iphdr *iph, __be32 daddr)
{
__u32 csum = 0;
__u32 csum;

/* Phase 1 : rewrite IP header */
iph->saddr = iph->daddr;
iph->daddr = daddr;
--iph->ttl;
iph->check = 0;
ipv4_csum(iph, sizeof(struct iphdr), &csum);
iph->check = csum;
/* avoid doing ipv4_csum(iph, sizeof(struct iphdr), &csum); */
csum = iph->check + 0x100; /* RFC 1141: incremet checksum high byte */
iph->check = csum + (csum >> 16); /* add carry */
}

static __always_inline void
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