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/*
* Copyright (c) 2016 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.
*/
#include <rte_malloc.h>
#include <rte_errno.h>
#include "tcp_stream.h"
#include "tcp_rxq.h"
#define OFO_FRACTION 4
#define OFO_DB_MAX 0x20U
#define OFODB_OBJ_MIN 8U
#define OFODB_OBJ_MAX 0x20U
#define OFO_OBJ_MAX (OFODB_OBJ_MAX * OFO_DB_MAX)
void
tcp_ofo_free(struct ofo *ofo)
{
rte_free(ofo);
}
static void
calc_ofo_elems(uint32_t nbufs, uint32_t *nobj, uint32_t *ndb)
{
uint32_t n, nd, no;
n = nbufs / OFO_FRACTION;
n = RTE_MAX(n, OFODB_OBJ_MIN);
n = RTE_MIN(n, OFO_OBJ_MAX);
no = OFODB_OBJ_MIN / 2;
do {
no *= 2;
nd = n / no;
} while (nd > OFO_DB_MAX);
*nobj = no;
*ndb = nd;
}
struct ofo *
tcp_ofo_alloc(uint32_t nbufs, int32_t socket)
{
uint32_t i, ndb, nobj;
size_t dsz, osz, sz;
struct ofo *ofo;
struct rte_mbuf **obj;
calc_ofo_elems(nbufs, &nobj, &ndb);
osz = sizeof(*ofo) + sizeof(ofo->db[0]) * ndb;
dsz = sizeof(ofo->db[0].obj[0]) * nobj * ndb;
sz = osz + dsz;
ofo = rte_zmalloc_socket(NULL, sz, RTE_CACHE_LINE_SIZE, socket);
if (ofo == NULL) {
TCP_LOG(ERR, "%s: allocation of %zu bytes on socket %d "
"failed with error code: %d\n",
__func__, sz, socket, rte_errno);
return NULL;
}
obj = (struct rte_mbuf **)&ofo->db[ndb];
for (i = 0; i != ndb; i++) {
ofo->db[i].nb_max = nobj;
ofo->db[i].obj = obj + i * nobj;
}
ofo->nb_max = ndb;
return ofo;
}
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