New upstream version 17.11-rc3

[deb_dpdk.git] / lib / librte_gso / gso_tcp4.c

diff --git a/lib/librte_gso/gso_tcp4.c b/lib/librte_gso/gso_tcp4.c
new file mode 100644 (file)
index 0000000..0c628cb
--- /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;
+}