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/* SPDX-License-Identifier: BSD-3-Clause
* Copyright 2017 6WIND S.A.
* Copyright 2017 Mellanox Technologies, Ltd
*/
#include <rte_atomic.h>
#include <rte_debug.h>
#include <rte_mbuf.h>
#include <rte_ethdev_driver.h>
#include "failsafe_private.h"
static inline int
fs_rx_unsafe(struct sub_device *sdev)
{
return (ETH(sdev) == NULL) ||
(ETH(sdev)->rx_pkt_burst == NULL) ||
(sdev->state != DEV_STARTED) ||
(sdev->remove != 0);
}
static inline int
fs_tx_unsafe(struct sub_device *sdev)
{
return (sdev == NULL) ||
(ETH(sdev) == NULL) ||
(ETH(sdev)->tx_pkt_burst == NULL) ||
(sdev->state != DEV_STARTED);
}
void
failsafe_set_burst_fn(struct rte_eth_dev *dev, int force_safe)
{
struct sub_device *sdev;
uint8_t i;
int need_safe;
int safe_set;
need_safe = force_safe;
FOREACH_SUBDEV(sdev, i, dev)
need_safe |= fs_rx_unsafe(sdev);
safe_set = (dev->rx_pkt_burst == &failsafe_rx_burst);
if (need_safe && !safe_set) {
DEBUG("Using safe RX bursts%s",
(force_safe ? " (forced)" : ""));
dev->rx_pkt_burst = &failsafe_rx_burst;
} else if (!need_safe && safe_set) {
DEBUG("Using fast RX bursts");
dev->rx_pkt_burst = &failsafe_rx_burst_fast;
}
need_safe = force_safe || fs_tx_unsafe(TX_SUBDEV(dev));
safe_set = (dev->tx_pkt_burst == &failsafe_tx_burst);
if (need_safe && !safe_set) {
DEBUG("Using safe TX bursts%s",
(force_safe ? " (forced)" : ""));
dev->tx_pkt_burst = &failsafe_tx_burst;
} else if (!need_safe && safe_set) {
DEBUG("Using fast TX bursts");
dev->tx_pkt_burst = &failsafe_tx_burst_fast;
}
rte_wmb();
}
/*
* Override source port in Rx packets.
*
* Make Rx packets originate from this PMD instance instead of one of its
* sub-devices. This is mandatory to avoid breaking applications.
*/
static void
failsafe_rx_set_port(struct rte_mbuf **rx_pkts, uint16_t nb_pkts, uint16_t port)
{
unsigned int i;
for (i = 0; i != nb_pkts; ++i)
rx_pkts[i]->port = port;
}
uint16_t
failsafe_rx_burst(void *queue,
struct rte_mbuf **rx_pkts,
uint16_t nb_pkts)
{
struct sub_device *sdev;
struct rxq *rxq;
void *sub_rxq;
uint16_t nb_rx;
rxq = queue;
sdev = rxq->sdev;
do {
if (fs_rx_unsafe(sdev)) {
nb_rx = 0;
sdev = sdev->next;
continue;
}
sub_rxq = ETH(sdev)->data->rx_queues[rxq->qid];
FS_ATOMIC_P(rxq->refcnt[sdev->sid]);
nb_rx = ETH(sdev)->
rx_pkt_burst(sub_rxq, rx_pkts, nb_pkts);
FS_ATOMIC_V(rxq->refcnt[sdev->sid]);
sdev = sdev->next;
} while (nb_rx == 0 && sdev != rxq->sdev);
rxq->sdev = sdev;
if (nb_rx)
failsafe_rx_set_port(rx_pkts, nb_rx,
rxq->priv->data->port_id);
return nb_rx;
}
uint16_t
failsafe_rx_burst_fast(void *queue,
struct rte_mbuf **rx_pkts,
uint16_t nb_pkts)
{
struct sub_device *sdev;
struct rxq *rxq;
void *sub_rxq;
uint16_t nb_rx;
rxq = queue;
sdev = rxq->sdev;
do {
RTE_ASSERT(!fs_rx_unsafe(sdev));
sub_rxq = ETH(sdev)->data->rx_queues[rxq->qid];
FS_ATOMIC_P(rxq->refcnt[sdev->sid]);
nb_rx = ETH(sdev)->
rx_pkt_burst(sub_rxq, rx_pkts, nb_pkts);
FS_ATOMIC_V(rxq->refcnt[sdev->sid]);
sdev = sdev->next;
} while (nb_rx == 0 && sdev != rxq->sdev);
rxq->sdev = sdev;
if (nb_rx)
failsafe_rx_set_port(rx_pkts, nb_rx,
rxq->priv->data->port_id);
return nb_rx;
}
uint16_t
failsafe_tx_burst(void *queue,
struct rte_mbuf **tx_pkts,
uint16_t nb_pkts)
{
struct sub_device *sdev;
struct txq *txq;
void *sub_txq;
uint16_t nb_tx;
txq = queue;
sdev = TX_SUBDEV(&rte_eth_devices[txq->priv->data->port_id]);
if (unlikely(fs_tx_unsafe(sdev)))
return 0;
sub_txq = ETH(sdev)->data->tx_queues[txq->qid];
FS_ATOMIC_P(txq->refcnt[sdev->sid]);
nb_tx = ETH(sdev)->tx_pkt_burst(sub_txq, tx_pkts, nb_pkts);
FS_ATOMIC_V(txq->refcnt[sdev->sid]);
return nb_tx;
}
uint16_t
failsafe_tx_burst_fast(void *queue,
struct rte_mbuf **tx_pkts,
uint16_t nb_pkts)
{
struct sub_device *sdev;
struct txq *txq;
void *sub_txq;
uint16_t nb_tx;
txq = queue;
sdev = TX_SUBDEV(&rte_eth_devices[txq->priv->data->port_id]);
RTE_ASSERT(!fs_tx_unsafe(sdev));
sub_txq = ETH(sdev)->data->tx_queues[txq->qid];
FS_ATOMIC_P(txq->refcnt[sdev->sid]);
nb_tx = ETH(sdev)->tx_pkt_burst(sub_txq, tx_pkts, nb_pkts);
FS_ATOMIC_V(txq->refcnt[sdev->sid]);
return nb_tx;
}
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