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/* SPDX-License-Identifier: BSD-3-Clause
* Copyright (c) 2013-2018 Linaro Limited
* Copyright (c) 2013 Nokia Solutions and Networks
*/
#include <odp_packet_io_internal.h>
#include <errno.h>
#include <inttypes.h>
static int sock_recv_mq_tmo_select(pktio_entry_t * const *entry,
const int index[],
uint32_t num_q, uint32_t *from,
odp_packet_t packets[], int num,
uint64_t usecs, fd_set *readfds,
int maxfd)
{
struct timeval timeout;
uint32_t i;
int ret;
for (i = 0; i < num_q; i++) {
ret = entry[i]->ops->recv(entry[i], index[i], packets, num);
if (ret > 0 && from)
*from = i;
if (ret != 0)
return ret;
}
timeout.tv_sec = usecs / (1000 * 1000);
timeout.tv_usec = usecs - timeout.tv_sec * (1000ULL * 1000ULL);
if (select(maxfd + 1, readfds, NULL, NULL, &timeout) == 0)
return 0;
for (i = 0; i < num_q; i++) {
ret = entry[i]->ops->recv(entry[i], index[i], packets, num);
if (ret > 0 && from)
*from = i;
if (ret != 0)
return ret;
}
return 0;
}
int _odp_sock_recv_mq_tmo_try_int_driven(const struct odp_pktin_queue_t queues[],
uint32_t num_q, uint32_t *from,
odp_packet_t packets[], int num,
uint64_t usecs, int *trial_successful)
{
uint32_t i;
pktio_entry_t *entry[num_q];
int index[num_q];
fd_set readfds;
int maxfd = -1;
int (*impl)(pktio_entry_t *entry[], int index[], uint32_t num_q,
odp_packet_t packets[], int num, uint32_t *from,
uint64_t wait_usecs) = NULL;
int impl_set = 0;
/* First, we get pktio entries and queue indices. We then see if the
implementation function pointers are the same. If they are the
same, impl will be set to non-NULL; otherwise it will be NULL. */
for (i = 0; i < num_q; i++) {
entry[i] = get_pktio_entry(queues[i].pktio);
index[i] = queues[i].index;
if (entry[i] == NULL) {
_ODP_DBG("pktio entry %" PRIuPTR " does not exist\n",
(uintptr_t)queues[i].pktio);
*trial_successful = 0;
return -1;
}
if (odp_unlikely(entry[i]->state != PKTIO_STATE_STARTED)) {
*trial_successful = 0;
return 0;
}
if (entry[i]->ops->recv_mq_tmo == NULL &&
entry[i]->ops->fd_set == NULL) {
*trial_successful = 0;
return 0;
}
if (!impl_set) {
impl = entry[i]->ops->recv_mq_tmo;
impl_set = 1;
} else {
if (impl != entry[i]->ops->recv_mq_tmo)
impl = NULL;
}
}
/* Check whether we can call the compatible implementation */
if (impl != NULL) {
*trial_successful = 1;
return impl(entry, index, num_q, packets, num, from, usecs);
}
/* Get file descriptor sets of devices. maxfd will be -1 if this
fails. */
FD_ZERO(&readfds);
for (i = 0; i < num_q; i++) {
if (entry[i]->ops->fd_set) {
int maxfd2;
maxfd2 = entry[i]->ops->fd_set(entry[i], queues[i].index, &readfds);
if (maxfd2 < 0) {
maxfd = -1;
break;
}
if (maxfd2 > maxfd)
maxfd = maxfd2;
} else {
maxfd = -1;
}
}
/* Check whether we can call the select() implementation */
if (maxfd >= 0) {
*trial_successful = 1;
return sock_recv_mq_tmo_select(entry, index, num_q, from,
packets, num, usecs,
&readfds, maxfd);
}
/* No mechanism worked. Set trial_successful to 0 so that polling will
be used by the main implementation. */
*trial_successful = 0;
return 0;
}
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