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/*
* Copyright (c) 2016-2017 Intel Corporation.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef _TCP_RXQ_H_
#define _TCP_RXQ_H_
#include "tcp_ofo.h"
#ifdef __cplusplus
extern "C" {
#endif
struct rxq_objs {
struct rte_mbuf **mb;
uint32_t num;
};
static inline uint32_t
rx_ofo_enqueue(struct tle_tcp_stream *s, union seqlen *sl,
struct rte_mbuf *mb[], uint32_t num)
{
uint32_t i, n;
n = 0;
do {
i = _ofo_step(s->rx.ofo, sl, mb + n, num - n);
n += i;
} while (i != 0 && n != num);
_ofo_compact(s->rx.ofo);
return n;
}
static inline uint32_t
rx_ofo_reduce(struct tle_tcp_stream *s)
{
uint32_t i, n, end, seq;
struct ofo *ofo;
struct ofodb *db;
union seqlen sl;
seq = s->tcb.rcv.nxt;
ofo = s->rx.ofo;
n = 0;
for (i = 0; i != ofo->nb_elem; i++) {
db = ofo->db + i;
/* gap still present */
if (tcp_seq_lt(seq, db->sl.seq))
break;
end = db->sl.seq + db->sl.len;
/* this db is fully overlapped */
if (tcp_seq_leq(end, seq))
_ofodb_free(db);
else
n += _ofodb_enqueue(s->rx.q, db, &sl);
seq = sl.seq + sl.len;
}
s->tcb.rcv.nxt = seq;
_ofo_remove(ofo, 0, i);
return n;
}
static inline uint32_t
rx_ino_enqueue(struct tle_tcp_stream *s, union seqlen *sl,
struct rte_mbuf *mb[], uint32_t num)
{
uint32_t i, n;
n = _rte_ring_enqueue_burst(s->rx.q, (void * const *)mb, num);
/* error: can'queue some packets into receive buffer. */
for (i = n; i != num; i++)
sl->len -= mb[i]->pkt_len;
s->tcb.rcv.nxt = sl->seq + sl->len;
return n;
}
static inline uint32_t
rx_data_enqueue(struct tle_tcp_stream *s, uint32_t seq, uint32_t len,
struct rte_mbuf *mb[], uint32_t num)
{
uint32_t n, r, t;
union seqlen sl;
sl.seq = seq;
sl.len = len;
r = rte_ring_count(s->rx.q);
/* in order packets, ready to be delivered */
if (seq == s->tcb.rcv.nxt) {
t = rx_ino_enqueue(s, &sl, mb, num);
/* failed to queue all input in-order packets */
if (t != num)
TCP_LOG(DEBUG,
"%s(s=%p, seq=%u, len=%u, num=%u) failed to queue "
"%u packets;\n",
__func__, s, seq, len, num, num - t);
/* try to consume some out-of-order packets*/
else {
n = rx_ofo_reduce(s);
if (n != 0)
TCP_LOG(DEBUG,
"%s(s=%p, rcv.nxt=%u) failed to queue %u "
"OFO packets;\n",
__func__, s, s->tcb.rcv.nxt, n);
}
/* queue out of order packets */
} else {
t = rx_ofo_enqueue(s, &sl, mb, num);
}
n = rte_ring_count(s->rx.q);
if (r != n) {
/* raise RX event */
if (s->rx.ev != NULL)
tle_event_raise(s->rx.ev);
/* if RX queue was empty invoke RX notification callback. */
else if (s->rx.cb.func != NULL && r == 0)
s->rx.cb.func(s->rx.cb.data, &s->s);
}
return t;
}
static inline uint32_t
tcp_rxq_get_objs(struct tle_tcp_stream *s, struct rxq_objs obj[2])
{
struct rte_ring *r;
uint32_t n, head, sz;
r = s->rx.q;
n = _rte_ring_mcs_dequeue_start(r, UINT32_MAX);
if (n == 0)
return 0;
sz = _rte_ring_get_size(r);
head = (r->cons.head - n) & _rte_ring_get_mask(r);
obj[0].mb = (struct rte_mbuf **)(_rte_ring_get_data(r) + head);
obj[1].mb = (struct rte_mbuf **)_rte_ring_get_data(r);
if (head + n <= sz) {
obj[0].num = n;
obj[1].num = 0;
return 1;
} else {
obj[0].num = sz - head;
obj[1].num = n + head - sz;
return 2;
}
}
static inline void
tcp_rxq_consume(struct tle_tcp_stream *s, uint32_t num)
{
_rte_ring_mcs_dequeue_finish(s->rx.q, num);
}
#ifdef __cplusplus
}
#endif
#endif /* _TCP_RXQ_H_ */
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