- struct rte_mbuf *in_seg = NULL;
- struct ipv4_hdr *in_hdr;
- uint32_t out_pkt_pos, in_seg_data_pos;
- uint32_t more_in_segs;
- uint16_t fragment_offset, flag_offset, frag_size;
-
- frag_size = (uint16_t)(mtu_size - sizeof(struct ipv4_hdr));
-
- /* Fragment size should be a multiply of 8. */
- RTE_IPV4_FRAG_ASSERT((frag_size & IPV4_HDR_FO_MASK) == 0);
-
- /* Fragment size should be a multiply of 8. */
- RTE_IPV4_FRAG_ASSERT(IPV4_MAX_FRAGS_PER_PACKET * frag_size >=
- (uint16_t)(pkt_in->pkt.pkt_len - sizeof (struct ipv4_hdr)));
-
- in_hdr = (struct ipv4_hdr*) pkt_in->pkt.data;
- flag_offset = rte_cpu_to_be_16(in_hdr->fragment_offset);
-
- /* If Don't Fragment flag is set */
- if (unlikely ((flag_offset & IPV4_HDR_DF_MASK) != 0))
- return (-ENOTSUP);
-
- /* Check that pkts_out is big enough to hold all fragments */
- if (unlikely (frag_size * nb_pkts_out <
- (uint16_t)(pkt_in->pkt.pkt_len - sizeof (struct ipv4_hdr))))
- return (-EINVAL);
-
- in_seg = pkt_in;
- in_seg_data_pos = sizeof(struct ipv4_hdr);
- out_pkt_pos = 0;
- fragment_offset = 0;
-
- more_in_segs = 1;
- while (likely(more_in_segs)) {
- struct rte_mbuf *out_pkt = NULL, *out_seg_prev = NULL;
- uint32_t more_out_segs;
- struct ipv4_hdr *out_hdr;
-
- /* Allocate direct buffer */
- out_pkt = rte_pktmbuf_alloc(pool_direct);
- if (unlikely(out_pkt == NULL)) {
- __free_fragments(pkts_out, out_pkt_pos);
- return (-ENOMEM);
- }
-
- /* Reserve space for the IP header that will be built later */
- out_pkt->pkt.data_len = sizeof(struct ipv4_hdr);
- out_pkt->pkt.pkt_len = sizeof(struct ipv4_hdr);
-
- out_seg_prev = out_pkt;
- more_out_segs = 1;
- while (likely(more_out_segs && more_in_segs)) {
- struct rte_mbuf *out_seg = NULL;
- uint32_t len;
-
- /* Allocate indirect buffer */
- out_seg = rte_pktmbuf_alloc(pool_indirect);
- if (unlikely(out_seg == NULL)) {
- rte_pktmbuf_free(out_pkt);
- __free_fragments(pkts_out, out_pkt_pos);
- return (-ENOMEM);
- }
- out_seg_prev->pkt.next = out_seg;
- out_seg_prev = out_seg;
-
- /* Prepare indirect buffer */
- rte_pktmbuf_attach(out_seg, in_seg);
- len = mtu_size - out_pkt->pkt.pkt_len;
- if (len > (in_seg->pkt.data_len - in_seg_data_pos)) {
- len = in_seg->pkt.data_len - in_seg_data_pos;
- }
- out_seg->pkt.data = (char*) in_seg->pkt.data + (uint16_t)in_seg_data_pos;
- out_seg->pkt.data_len = (uint16_t)len;
- out_pkt->pkt.pkt_len = (uint16_t)(len +
- out_pkt->pkt.pkt_len);
- out_pkt->pkt.nb_segs += 1;
- in_seg_data_pos += len;
-
- /* Current output packet (i.e. fragment) done ? */
- if (unlikely(out_pkt->pkt.pkt_len >= mtu_size)) {
- more_out_segs = 0;
- }
-
- /* Current input segment done ? */
- if (unlikely(in_seg_data_pos == in_seg->pkt.data_len)) {
- in_seg = in_seg->pkt.next;
- in_seg_data_pos = 0;
-
- if (unlikely(in_seg == NULL)) {
- more_in_segs = 0;
- }
- }
- }
-
- /* Build the IP header */
-
- out_hdr = (struct ipv4_hdr*) out_pkt->pkt.data;
-
- __fill_ipv4hdr_frag(out_hdr, in_hdr,
- (uint16_t)out_pkt->pkt.pkt_len,
- flag_offset, fragment_offset, more_in_segs);
-
- fragment_offset = (uint16_t)(fragment_offset +
- out_pkt->pkt.pkt_len - sizeof(struct ipv4_hdr));
-
- out_pkt->ol_flags |= PKT_TX_IP_CKSUM;
- out_pkt->pkt.vlan_macip.f.l3_len = sizeof(struct ipv4_hdr);
-
- /* Write the fragment to the output list */
- pkts_out[out_pkt_pos] = out_pkt;
- out_pkt_pos ++;
- }