DPDK  20.11.3
examples/l2fwd-event/l2fwd_poll.c
/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(C) 2019 Marvell International Ltd.
*/
#include "l2fwd_poll.h"
static inline void
l2fwd_poll_simple_forward(struct l2fwd_resources *rsrc, struct rte_mbuf *m,
uint32_t portid)
{
struct rte_eth_dev_tx_buffer *buffer;
uint32_t dst_port;
int sent;
dst_port = rsrc->dst_ports[portid];
if (rsrc->mac_updating)
l2fwd_mac_updating(m, dst_port, &rsrc->eth_addr[dst_port]);
buffer = ((struct l2fwd_poll_resources *)rsrc->poll_rsrc)->tx_buffer[
dst_port];
sent = rte_eth_tx_buffer(dst_port, 0, buffer, m);
if (sent)
rsrc->port_stats[dst_port].tx += sent;
}
/* main poll mode processing loop */
static void
l2fwd_poll_main_loop(struct l2fwd_resources *rsrc)
{
uint64_t prev_tsc, diff_tsc, cur_tsc, drain_tsc;
struct l2fwd_poll_resources *poll_rsrc = rsrc->poll_rsrc;
struct rte_mbuf *pkts_burst[MAX_PKT_BURST];
struct rte_eth_dev_tx_buffer *buf;
struct lcore_queue_conf *qconf;
uint32_t i, j, port_id, nb_rx;
struct rte_mbuf *m;
uint32_t lcore_id;
int32_t sent;
drain_tsc = (rte_get_tsc_hz() + US_PER_S - 1) / US_PER_S *
BURST_TX_DRAIN_US;
prev_tsc = 0;
lcore_id = rte_lcore_id();
qconf = &poll_rsrc->lcore_queue_conf[lcore_id];
if (qconf->n_rx_port == 0) {
printf("lcore %u has nothing to do\n", lcore_id);
return;
}
printf("entering main loop on lcore %u\n", lcore_id);
for (i = 0; i < qconf->n_rx_port; i++) {
port_id = qconf->rx_port_list[i];
printf(" -- lcoreid=%u port_id=%u\n", lcore_id, port_id);
}
while (!rsrc->force_quit) {
cur_tsc = rte_rdtsc();
/*
* TX burst queue drain
*/
diff_tsc = cur_tsc - prev_tsc;
if (unlikely(diff_tsc > drain_tsc)) {
for (i = 0; i < qconf->n_rx_port; i++) {
port_id =
rsrc->dst_ports[qconf->rx_port_list[i]];
buf = poll_rsrc->tx_buffer[port_id];
sent = rte_eth_tx_buffer_flush(port_id, 0, buf);
if (sent)
rsrc->port_stats[port_id].tx += sent;
}
prev_tsc = cur_tsc;
}
/*
* Read packet from RX queues
*/
for (i = 0; i < qconf->n_rx_port; i++) {
port_id = qconf->rx_port_list[i];
nb_rx = rte_eth_rx_burst(port_id, 0, pkts_burst,
MAX_PKT_BURST);
rsrc->port_stats[port_id].rx += nb_rx;
for (j = 0; j < nb_rx; j++) {
m = pkts_burst[j];
l2fwd_poll_simple_forward(rsrc, m, port_id);
}
}
}
}
static void
l2fwd_poll_lcore_config(struct l2fwd_resources *rsrc)
{
struct l2fwd_poll_resources *poll_rsrc = rsrc->poll_rsrc;
struct lcore_queue_conf *qconf = NULL;
uint32_t rx_lcore_id = 0;
uint16_t port_id;
/* Initialize the port/queue configuration of each logical core */
/* skip ports that are not enabled */
if ((rsrc->enabled_port_mask & (1 << port_id)) == 0)
continue;
/* get the lcore_id for this port */
while (rte_lcore_is_enabled(rx_lcore_id) == 0 ||
rx_lcore_id == rte_get_main_lcore() ||
poll_rsrc->lcore_queue_conf[rx_lcore_id].n_rx_port ==
rsrc->rx_queue_per_lcore) {
rx_lcore_id++;
if (rx_lcore_id >= RTE_MAX_LCORE)
rte_panic("Not enough cores\n");
}
if (qconf != &poll_rsrc->lcore_queue_conf[rx_lcore_id]) {
/* Assigned a new logical core in the loop above. */
qconf = &poll_rsrc->lcore_queue_conf[rx_lcore_id];
}
qconf->rx_port_list[qconf->n_rx_port] = port_id;
qconf->n_rx_port++;
printf("Lcore %u: RX port %u\n", rx_lcore_id, port_id);
}
}
static void
l2fwd_poll_init_tx_buffers(struct l2fwd_resources *rsrc)
{
struct l2fwd_poll_resources *poll_rsrc = rsrc->poll_rsrc;
uint16_t port_id;
int ret;
/* Initialize TX buffers */
poll_rsrc->tx_buffer[port_id] = rte_zmalloc_socket("tx_buffer",
RTE_ETH_TX_BUFFER_SIZE(MAX_PKT_BURST), 0,
if (poll_rsrc->tx_buffer[port_id] == NULL)
rte_panic("Cannot allocate buffer for tx on port %u\n",
port_id);
rte_eth_tx_buffer_init(poll_rsrc->tx_buffer[port_id],
MAX_PKT_BURST);
poll_rsrc->tx_buffer[port_id],
&rsrc->port_stats[port_id].dropped);
if (ret < 0)
rte_panic("Cannot set error callback for tx buffer on port %u\n",
port_id);
}
}
void
l2fwd_poll_resource_setup(struct l2fwd_resources *rsrc)
{
struct l2fwd_poll_resources *poll_rsrc;
poll_rsrc = rte_zmalloc("l2fwd_poll_rsrc",
sizeof(struct l2fwd_poll_resources), 0);
if (poll_rsrc == NULL)
rte_panic("Failed to allocate resources for l2fwd poll mode\n");
rsrc->poll_rsrc = poll_rsrc;
l2fwd_poll_lcore_config(rsrc);
l2fwd_poll_init_tx_buffers(rsrc);
poll_rsrc->poll_main_loop = l2fwd_poll_main_loop;
}