99a2dd955f
There is no reason for the DPDK libraries to all have 'librte_' prefix on the directory names. This prefix makes the directory names longer and also makes it awkward to add features referring to individual libraries in the build - should the lib names be specified with or without the prefix. Therefore, we can just remove the library prefix and use the library's unique name as the directory name, i.e. 'eal' rather than 'librte_eal' Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
83 lines
2.1 KiB
C
83 lines
2.1 KiB
C
/* SPDX-License-Identifier: BSD-3-Clause
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* Copyright(c) 2018 Intel Corporation
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*/
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#include "gso_common.h"
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#include "gso_udp4.h"
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#define IPV4_HDR_MF_BIT (1U << 13)
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static inline void
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update_ipv4_udp_headers(struct rte_mbuf *pkt, struct rte_mbuf **segs,
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uint16_t nb_segs)
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{
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struct rte_ipv4_hdr *ipv4_hdr;
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uint16_t frag_offset = 0, is_mf;
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uint16_t l2_hdrlen = pkt->l2_len, l3_hdrlen = pkt->l3_len;
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uint16_t tail_idx = nb_segs - 1, length, i;
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/*
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* Update IP header fields for output segments. Specifically,
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* keep the same IP id, update fragment offset and total
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* length.
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*/
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for (i = 0; i < nb_segs; i++) {
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ipv4_hdr = rte_pktmbuf_mtod_offset(segs[i],
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struct rte_ipv4_hdr *, l2_hdrlen);
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length = segs[i]->pkt_len - l2_hdrlen;
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ipv4_hdr->total_length = rte_cpu_to_be_16(length);
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is_mf = i < tail_idx ? IPV4_HDR_MF_BIT : 0;
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ipv4_hdr->fragment_offset =
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rte_cpu_to_be_16(frag_offset | is_mf);
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frag_offset += ((length - l3_hdrlen) >> 3);
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}
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}
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int
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gso_udp4_segment(struct rte_mbuf *pkt,
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uint16_t gso_size,
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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 rte_ipv4_hdr *ipv4_hdr;
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uint16_t pyld_unit_size, hdr_offset;
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uint16_t frag_off;
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int ret;
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/* Don't process the fragmented packet */
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ipv4_hdr = rte_pktmbuf_mtod_offset(pkt, struct rte_ipv4_hdr *,
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pkt->l2_len);
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frag_off = rte_be_to_cpu_16(ipv4_hdr->fragment_offset);
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if (unlikely(IS_FRAGMENTED(frag_off))) {
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return 0;
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}
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/*
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* UDP fragmentation is the same as IP fragmentation.
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* Except the first one, other output packets just have l2
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* and l3 headers.
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*/
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hdr_offset = pkt->l2_len + pkt->l3_len;
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/* Don't process the packet without data. */
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if (unlikely(hdr_offset + pkt->l4_len >= pkt->pkt_len)) {
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return 0;
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}
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/* pyld_unit_size must be a multiple of 8 because frag_off
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* uses 8 bytes as unit.
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*/
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pyld_unit_size = (gso_size - hdr_offset) & ~7U;
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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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update_ipv4_udp_headers(pkt, pkts_out, ret);
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return ret;
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}
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