57e852429d
This adds a new forwarding mode to testpmd, whereby it will forward packets, but on a transmit failure, it will wait a small amount of time before retrying the transmit again. This mode can be useful in some cases to set a zero-packet loss rate at the cost of overall throughput, especially in cases where TX ring size/buffering is constrained, such as with virtio. Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
166 lines
4.8 KiB
C
166 lines
4.8 KiB
C
/*-
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* BSD LICENSE
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*
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* Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <stdarg.h>
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#include <string.h>
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#include <stdio.h>
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#include <errno.h>
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#include <stdint.h>
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#include <unistd.h>
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#include <inttypes.h>
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#include <sys/queue.h>
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#include <sys/stat.h>
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#include <rte_common.h>
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#include <rte_byteorder.h>
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#include <rte_log.h>
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#include <rte_debug.h>
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#include <rte_cycles.h>
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#include <rte_memory.h>
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#include <rte_memcpy.h>
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#include <rte_memzone.h>
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#include <rte_launch.h>
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#include <rte_tailq.h>
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#include <rte_eal.h>
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#include <rte_per_lcore.h>
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#include <rte_lcore.h>
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#include <rte_atomic.h>
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#include <rte_branch_prediction.h>
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#include <rte_ring.h>
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#include <rte_memory.h>
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#include <rte_mempool.h>
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#include <rte_mbuf.h>
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#include <rte_interrupts.h>
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#include <rte_pci.h>
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#include <rte_ether.h>
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#include <rte_ethdev.h>
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#include <rte_ip.h>
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#include <rte_string_fns.h>
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#include "testpmd.h"
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#define BURST_TX_WAIT_US 10
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#define BURST_TX_RETRIES 5
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/*
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* Global variables that control number of retires and
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* timeout (in us) between retires.
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*/
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uint32_t burst_tx_delay_time = BURST_TX_WAIT_US;
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uint32_t burst_tx_retry_num = BURST_TX_RETRIES;
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/*
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* Forwarding of packets in MAC mode with a wait and retry on TX to reduce packet loss.
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* Change the source and the destination Ethernet addressed of packets
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* before forwarding them.
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*/
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static void
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pkt_burst_mac_retry_forward(struct fwd_stream *fs)
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{
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struct rte_mbuf *pkts_burst[MAX_PKT_BURST];
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struct rte_mbuf *mb;
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struct ether_hdr *eth_hdr;
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uint32_t retry;
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uint16_t nb_rx;
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uint16_t nb_tx;
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uint16_t i;
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#ifdef RTE_TEST_PMD_RECORD_CORE_CYCLES
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uint64_t start_tsc;
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uint64_t end_tsc;
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uint64_t core_cycles;
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#endif
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#ifdef RTE_TEST_PMD_RECORD_CORE_CYCLES
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start_tsc = rte_rdtsc();
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#endif
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/*
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* Receive a burst of packets and forward them.
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*/
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nb_rx = rte_eth_rx_burst(fs->rx_port, fs->rx_queue, pkts_burst,
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nb_pkt_per_burst);
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if (unlikely(nb_rx == 0))
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return;
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#ifdef RTE_TEST_PMD_RECORD_BURST_STATS
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fs->rx_burst_stats.pkt_burst_spread[nb_rx]++;
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#endif
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fs->rx_packets += nb_rx;
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for (i = 0; i < nb_rx; i++) {
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mb = pkts_burst[i];
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eth_hdr = (struct ether_hdr *) mb->pkt.data;
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ether_addr_copy(&peer_eth_addrs[fs->peer_addr],
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ð_hdr->d_addr);
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ether_addr_copy(&ports[fs->tx_port].eth_addr,
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ð_hdr->s_addr);
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}
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nb_tx = rte_eth_tx_burst(fs->tx_port, fs->tx_queue, pkts_burst, nb_rx);
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/*
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* If not all packets have been TX'd then wait and retry.
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*/
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if (unlikely(nb_tx < nb_rx)) {
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for (retry = 0; retry < burst_tx_retry_num; retry++) {
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rte_delay_us(burst_tx_delay_time);
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nb_tx += rte_eth_tx_burst(fs->tx_port, fs->tx_queue,
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&pkts_burst[nb_tx], nb_rx - nb_tx);
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if (nb_tx == nb_rx)
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break;
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}
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}
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fs->tx_packets += nb_tx;
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#ifdef RTE_TEST_PMD_RECORD_BURST_STATS
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fs->tx_burst_stats.pkt_burst_spread[nb_tx]++;
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#endif
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if (unlikely(nb_tx < nb_rx)) {
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fs->fwd_dropped += (nb_rx - nb_tx);
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do {
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rte_pktmbuf_free(pkts_burst[nb_tx]);
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} while (++nb_tx < nb_rx);
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}
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#ifdef RTE_TEST_PMD_RECORD_CORE_CYCLES
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end_tsc = rte_rdtsc();
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core_cycles = (end_tsc - start_tsc);
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fs->core_cycles = (uint64_t) (fs->core_cycles + core_cycles);
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#endif
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}
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struct fwd_engine mac_retry_fwd_engine = {
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.fwd_mode_name = "mac_retry",
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.port_fwd_begin = NULL,
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.port_fwd_end = NULL,
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.packet_fwd = pkt_burst_mac_retry_forward,
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};
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