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/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2018 Intel Corporation
*/
#include "gso_common.h"
#include "gso_udp4.h"
#define IPV4_HDR_MF_BIT (1U << 13)
static inline void
update_ipv4_udp_headers(struct rte_mbuf *pkt, struct rte_mbuf **segs,
uint16_t nb_segs)
{
struct ipv4_hdr *ipv4_hdr;
uint16_t frag_offset = 0, is_mf;
uint16_t l2_hdrlen = pkt->l2_len, l3_hdrlen = pkt->l3_len;
uint16_t tail_idx = nb_segs - 1, length, i;
/*
* Update IP header fields for output segments. Specifically,
* keep the same IP id, update fragment offset and total
* length.
*/
for (i = 0; i < nb_segs; i++) {
ipv4_hdr = rte_pktmbuf_mtod_offset(segs[i], struct ipv4_hdr *,
l2_hdrlen);
length = segs[i]->pkt_len - l2_hdrlen;
ipv4_hdr->total_length = rte_cpu_to_be_16(length);
is_mf = i < tail_idx ? IPV4_HDR_MF_BIT : 0;
ipv4_hdr->fragment_offset =
rte_cpu_to_be_16(frag_offset | is_mf);
frag_offset += ((length - l3_hdrlen) >> 3);
}
}
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 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 ipv4_hdr *,
pkt->l2_len);
frag_off = rte_be_to_cpu_16(ipv4_hdr->fragment_offset);
if (unlikely(IS_FRAGMENTED(frag_off))) {
pkts_out[0] = pkt;
return 1;
}
/*
* 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)) {
pkts_out[0] = pkt;
return 1;
}
pyld_unit_size = gso_size - hdr_offset;
/* 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;
}
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