2 * Copyright (c) 2016-2017 Intel Corporation.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
16 #ifndef _TCP_TX_SEG_H_
17 #define _TCP_TX_SEG_H_
24 tcp_segmentation(struct rte_mbuf *mbin, struct rte_mbuf *mbout[], uint16_t num,
25 const struct tle_dest *dst, uint16_t mss)
27 struct rte_mbuf *in_seg = NULL;
28 uint32_t nbseg, in_seg_data_pos;
29 uint32_t more_in_segs;
35 /* Check that pkts_out is big enough to hold all fragments */
36 if (mss * num < (uint16_t)mbin->pkt_len)
40 while (more_in_segs) {
41 struct rte_mbuf *out_pkt = NULL, *out_seg_prev = NULL;
42 uint32_t more_out_segs;
44 /* Allocate direct buffer */
45 out_pkt = rte_pktmbuf_alloc(dst->head_mp);
46 if (out_pkt == NULL) {
47 free_mbufs(mbout, nbseg);
51 out_seg_prev = out_pkt;
53 while (more_out_segs && more_in_segs) {
54 struct rte_mbuf *out_seg = NULL;
57 /* Allocate indirect buffer */
58 out_seg = rte_pktmbuf_alloc(dst->head_mp);
59 if (out_seg == NULL) {
60 rte_pktmbuf_free(out_pkt);
61 free_mbufs(mbout, nbseg);
64 out_seg_prev->next = out_seg;
65 out_seg_prev = out_seg;
67 /* Prepare indirect buffer */
68 rte_pktmbuf_attach(out_seg, in_seg);
70 if (len > (in_seg->data_len - in_seg_data_pos))
71 len = in_seg->data_len - in_seg_data_pos;
73 out_seg->data_off = in_seg->data_off + in_seg_data_pos;
74 out_seg->data_len = (uint16_t)len;
75 out_pkt->pkt_len = (uint16_t)(len + out_pkt->pkt_len);
76 out_pkt->nb_segs += 1;
77 in_seg_data_pos += len;
79 /* Current output packet (i.e. fragment) done ? */
80 if (out_pkt->pkt_len >= mss)
83 /* Current input segment done ? */
84 if (in_seg_data_pos == in_seg->data_len) {
85 in_seg = in_seg->next;
93 /* Write the segment to the output list */
94 mbout[nbseg] = out_pkt;
105 #endif /* _TCP_TX_SEG_H_ */