70e737e448
This patch adds GSO support for GRE-tunneled packets. Supported GRE packets must contain an outer IPv4 header, and inner TCP/IPv4 headers. They may also contain a single VLAN tag. GRE GSO doesn't check if all input packets have correct checksums and doesn't update checksums for output packets. Additionally, it doesn't process IP fragmented packets. As with VxLAN GSO, GRE GSO uses a two-segment MBUF to organize each output packet, which requires multi-segment mbuf support in the TX functions of the NIC driver. Also, if a packet is GSOed, GRE GSO reduces its MBUF refcnt by 1. As a result, when all of its GSOed segments are freed, the packet is freed automatically. Signed-off-by: Mark Kavanagh <mark.b.kavanagh@intel.com> Signed-off-by: Jiayu Hu <jiayu.hu@intel.com> Acked-by: Konstantin Ananyev <konstantin.ananyev@intel.com>
127 lines
4.3 KiB
C
127 lines
4.3 KiB
C
/*-
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* BSD LICENSE
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*
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* Copyright(c) 2017 Intel Corporation. All rights reserved.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "gso_common.h"
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#include "gso_tunnel_tcp4.h"
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static void
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update_tunnel_ipv4_tcp_headers(struct rte_mbuf *pkt, uint8_t ipid_delta,
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struct rte_mbuf **segs, uint16_t nb_segs)
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{
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struct ipv4_hdr *ipv4_hdr;
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struct tcp_hdr *tcp_hdr;
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uint32_t sent_seq;
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uint16_t outer_id, inner_id, tail_idx, i;
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uint16_t outer_ipv4_offset, inner_ipv4_offset;
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uint16_t udp_gre_offset, tcp_offset;
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uint8_t update_udp_hdr;
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outer_ipv4_offset = pkt->outer_l2_len;
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udp_gre_offset = outer_ipv4_offset + pkt->outer_l3_len;
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inner_ipv4_offset = udp_gre_offset + pkt->l2_len;
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tcp_offset = inner_ipv4_offset + pkt->l3_len;
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/* Outer IPv4 header. */
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ipv4_hdr = (struct ipv4_hdr *)(rte_pktmbuf_mtod(pkt, char *) +
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outer_ipv4_offset);
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outer_id = rte_be_to_cpu_16(ipv4_hdr->packet_id);
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/* Inner IPv4 header. */
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ipv4_hdr = (struct ipv4_hdr *)(rte_pktmbuf_mtod(pkt, char *) +
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inner_ipv4_offset);
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inner_id = rte_be_to_cpu_16(ipv4_hdr->packet_id);
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tcp_hdr = (struct tcp_hdr *)((char *)ipv4_hdr + pkt->l3_len);
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sent_seq = rte_be_to_cpu_32(tcp_hdr->sent_seq);
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tail_idx = nb_segs - 1;
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/* Only update UDP header for VxLAN packets. */
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update_udp_hdr = (pkt->ol_flags & PKT_TX_TUNNEL_VXLAN) ? 1 : 0;
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for (i = 0; i < nb_segs; i++) {
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update_ipv4_header(segs[i], outer_ipv4_offset, outer_id);
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if (update_udp_hdr)
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update_udp_header(segs[i], udp_gre_offset);
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update_ipv4_header(segs[i], inner_ipv4_offset, inner_id);
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update_tcp_header(segs[i], tcp_offset, sent_seq, i < tail_idx);
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outer_id++;
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inner_id += ipid_delta;
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sent_seq += (segs[i]->pkt_len - segs[i]->data_len);
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}
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}
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int
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gso_tunnel_tcp4_segment(struct rte_mbuf *pkt,
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uint16_t gso_size,
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uint8_t ipid_delta,
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struct rte_mempool *direct_pool,
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struct rte_mempool *indirect_pool,
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struct rte_mbuf **pkts_out,
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uint16_t nb_pkts_out)
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{
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struct ipv4_hdr *inner_ipv4_hdr;
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uint16_t pyld_unit_size, hdr_offset, frag_off;
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int ret = 1;
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hdr_offset = pkt->outer_l2_len + pkt->outer_l3_len + pkt->l2_len;
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inner_ipv4_hdr = (struct ipv4_hdr *)(rte_pktmbuf_mtod(pkt, char *) +
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hdr_offset);
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/*
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* Don't process the packet whose MF bit or offset in the inner
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* IPv4 header are non-zero.
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*/
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frag_off = rte_be_to_cpu_16(inner_ipv4_hdr->fragment_offset);
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if (unlikely(IS_FRAGMENTED(frag_off))) {
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pkts_out[0] = pkt;
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return 1;
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}
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hdr_offset += pkt->l3_len + pkt->l4_len;
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/* Don't process the packet without data */
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if (hdr_offset >= pkt->pkt_len) {
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pkts_out[0] = pkt;
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return 1;
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}
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pyld_unit_size = gso_size - hdr_offset;
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/* Segment the payload */
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ret = gso_do_segment(pkt, hdr_offset, pyld_unit_size, direct_pool,
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indirect_pool, pkts_out, nb_pkts_out);
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if (ret <= 1)
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return ret;
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update_tunnel_ipv4_tcp_headers(pkt, ipid_delta, pkts_out, ret);
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return ret;
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}
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