Function gso_udp4_segment

dpdk/lib/gso/gso_udp4.c:37–82

}

int
gso_udp4_segment(struct rte_mbuf *pkt,
		uint16_t gso_size,
		struct rte_mempool *direct_pool,
		struct rte_mempool *indirect_pool,
		struct rte_mbuf **pkts_out,
		uint16_t nb_pkts_out)
{
	struct rte_ipv4_hdr *ipv4_hdr;
	uint16_t pyld_unit_size, hdr_offset;
	uint16_t frag_off;
	int ret;

	/* Don't process the fragmented packet */
	ipv4_hdr = rte_pktmbuf_mtod_offset(pkt, struct rte_ipv4_hdr *,
			pkt->l2_len);
	frag_off = rte_be_to_cpu_16(ipv4_hdr->fragment_offset);
	if (unlikely(IS_FRAGMENTED(frag_off))) {
		return 0;
	}

	/*
	 * UDP fragmentation is the same as IP fragmentation.
	 * Except the first one, other output packets just have l2
	 * and l3 headers.
	 */
	hdr_offset = pkt->l2_len + pkt->l3_len;

	/* Don't process the packet without data. */
	if (unlikely(hdr_offset + pkt->l4_len >= pkt->pkt_len)) {
		return 0;
	}

	/* pyld_unit_size must be a multiple of 8 because frag_off
	 * uses 8 bytes as unit.
	 */
	pyld_unit_size = (gso_size - hdr_offset) & ~7U;

	/* Segment the payload */
	ret = gso_do_segment(pkt, hdr_offset, pyld_unit_size, direct_pool,
			indirect_pool, pkts_out, nb_pkts_out);
	if (ret > 1)
		update_ipv4_udp_headers(pkt, pkts_out, ret);

	return ret;
}