Function rte_ipv6_phdr_cksum

dpdk/lib/net/rte_ip.h:585–606

* Process the pseudo-header checksum of an IPv6 header. * * Depending on the ol_flags, the pseudo-header checksum expected by the * drivers is not the same. For instance, when TSO is enabled, the IPv6 * payload length must not be included in the packet. * * When ol_flags is 0, it computes the standard pseudo-header checksum. * * @param ipv6_hdr * The pointer to the contiguous IPv6 heade

 *   The non-complemented checksum to set in the L4 header.
 */
static inline uint16_t
rte_ipv6_phdr_cksum(const struct rte_ipv6_hdr *ipv6_hdr, uint64_t ol_flags)
{
	uint32_t sum;
	struct {
		rte_be32_t len;   /* L4 length. */
		rte_be32_t proto; /* L4 protocol - top 3 bytes must be zero */
	} psd_hdr;

	psd_hdr.proto = (uint32_t)(ipv6_hdr->proto << 24);
	if (ol_flags & (RTE_MBUF_F_TX_TCP_SEG | RTE_MBUF_F_TX_UDP_SEG)) {
		psd_hdr.len = 0;
	} else {
		psd_hdr.len = ipv6_hdr->payload_len;
	}

	sum = __rte_raw_cksum(ipv6_hdr->src_addr,
		sizeof(ipv6_hdr->src_addr) + sizeof(ipv6_hdr->dst_addr),
		0);
	sum = __rte_raw_cksum(&psd_hdr, sizeof(psd_hdr), sum);
	return __rte_raw_cksum_reduce(sum);
}

/**
 * @internal Calculate the non-complemented IPv6 L4 checksum