diff options
Diffstat (limited to 'lib/librte_gso/gso_tcp4.c')
| -rw-r--r-- | lib/librte_gso/gso_tcp4.c | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/lib/librte_gso/gso_tcp4.c b/lib/librte_gso/gso_tcp4.c new file mode 100644 index 00000000..0c628cb1 --- /dev/null +++ b/lib/librte_gso/gso_tcp4.c @@ -0,0 +1,102 @@ +/*- + * BSD LICENSE + * + * Copyright(c) 2017 Intel Corporation. All rights reserved. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * * Neither the name of Intel Corporation nor the names of its + * contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include "gso_common.h" +#include "gso_tcp4.h" + +static void +update_ipv4_tcp_headers(struct rte_mbuf *pkt, uint8_t ipid_delta, + struct rte_mbuf **segs, uint16_t nb_segs) +{ + struct ipv4_hdr *ipv4_hdr; + struct tcp_hdr *tcp_hdr; + uint32_t sent_seq; + uint16_t id, tail_idx, i; + uint16_t l3_offset = pkt->l2_len; + uint16_t l4_offset = l3_offset + pkt->l3_len; + + ipv4_hdr = (struct ipv4_hdr *)(rte_pktmbuf_mtod(pkt, char*) + + l3_offset); + tcp_hdr = (struct tcp_hdr *)((char *)ipv4_hdr + pkt->l3_len); + id = rte_be_to_cpu_16(ipv4_hdr->packet_id); + sent_seq = rte_be_to_cpu_32(tcp_hdr->sent_seq); + tail_idx = nb_segs - 1; + + for (i = 0; i < nb_segs; i++) { + update_ipv4_header(segs[i], l3_offset, id); + update_tcp_header(segs[i], l4_offset, sent_seq, i < tail_idx); + id += ipid_delta; + sent_seq += (segs[i]->pkt_len - segs[i]->data_len); + } +} + +int +gso_tcp4_segment(struct rte_mbuf *pkt, + uint16_t gso_size, + uint8_t ipid_delta, + 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 = (struct ipv4_hdr *)(rte_pktmbuf_mtod(pkt, char *) + + 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; + } + + /* Don't process the packet without data */ + hdr_offset = pkt->l2_len + pkt->l3_len + pkt->l4_len; + if (unlikely(hdr_offset >= 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_tcp_headers(pkt, ipid_delta, pkts_out, ret); + + return ret; +} |