[dpdk-dev] [PATCH 1/2] testpmd: add parameters buffersize-before-send and flush-timeout

[Jens Freimann <jfreimann@redhat.com>]

Create a fifo to buffer received packets. Once it flows over put
those packets into the actual tx queue. The fifo is created per tx
queue and its size can be set with the --buffersize-before-sending
commandline parameter.

A second commandline parameter is used to set a timeout in
milliseconds after which the fifo is flushed.

--buffersize-before-sending [packet numbers]
Keep the mbuf in a FIFO and forward the over flooding packets from the
FIFO. This queue is per TX-queue (after all other packet processing).

--flush-timer [delay]
Flush the packet queue if no packets have been seen during
[delay]. As long as packets are seen, the timer is reset.

Signed-off-by: Jens Freimann <jfreimann@redhat.com>
---
 app/test-pmd/fifo.h       | 43 ++++++++++++++++++++++++++++++++++
 app/test-pmd/iofwd.c      | 59 ++++++++++++++++++++++++++++++++++++++++++++++-
 app/test-pmd/parameters.c | 21 ++++++++++++++++-
 app/test-pmd/testpmd.c    | 48 ++++++++++++++++++++++++++++++++++++++
 app/test-pmd/testpmd.h    | 15 ++++++++++++
 config/common_base        |  1 +
 6 files changed, 185 insertions(+), 2 deletions(-)
 create mode 100644 app/test-pmd/fifo.h

diff --git a/app/test-pmd/fifo.h b/app/test-pmd/fifo.h
new file mode 100644
index 000000000..01415f98c
--- /dev/null
+++ b/app/test-pmd/fifo.h
@@ -0,0 +1,43 @@
+#ifndef __FIFO_H
+#define __FIFO_H
+#include <stdint.h>
+#include <rte_mbuf.h>
+#include <rte_ring.h>
+#include "testpmd.h"
+
+#define FIFO_COUNT_MAX 1024
+/**
+ * Add elements to fifo. Return number of written elements
+ */
+static inline unsigned
+fifo_put(struct rte_ring *r, struct rte_mbuf **data, unsigned num)
+{
+
+	return rte_ring_enqueue_burst(r, (void **)data, num, NULL);
+}
+
+/**
+ * Get elements from fifo. Return number of read elements
+ */
+static inline unsigned
+fifo_get(struct rte_ring *r, struct rte_mbuf **data, unsigned num)
+{
+	return rte_ring_dequeue_burst(r, (void **) data, num, NULL);
+}
+
+static inline unsigned
+fifo_count(struct rte_ring *r)
+{
+	return rte_ring_count(r);
+}
+
+static inline int
+fifo_full(struct rte_ring *r)
+{
+	return rte_ring_full(r);
+}
+
+
+struct rte_ring * fifo_init(uint32_t qi, uint32_t pi);
+
+#endif 
diff --git a/app/test-pmd/iofwd.c b/app/test-pmd/iofwd.c
index 9dce76efe..85fa000f7 100644
--- a/app/test-pmd/iofwd.c
+++ b/app/test-pmd/iofwd.c
@@ -36,6 +36,7 @@
 #include <rte_flow.h>
 
 #include "testpmd.h"
+#include "fifo.h"
 
 /*
  * Forwarding of packets in I/O mode.
@@ -48,7 +49,7 @@ pkt_burst_io_forward(struct fwd_stream *fs)
 {
 	struct rte_mbuf *pkts_burst[MAX_PKT_BURST];
 	uint16_t nb_rx;
-	uint16_t nb_tx;
+	uint16_t nb_tx = 0;
 	uint32_t retry;
 
 #ifdef RTE_TEST_PMD_RECORD_CORE_CYCLES
@@ -56,6 +57,15 @@ pkt_burst_io_forward(struct fwd_stream *fs)
 	uint64_t end_tsc;
 	uint64_t core_cycles;
 #endif
+#ifdef RTE_TEST_PMD_NOISY
+	const uint64_t freq_khz = rte_get_timer_hz() / 1000;
+	struct noisy_config *ncf = &noisy_cfg[fs->tx_queue];
+	struct rte_mbuf *tmp_pkts[MAX_PKT_BURST];
+	uint16_t nb_enqd;
+	uint16_t nb_deqd = 0;
+	uint64_t delta_ms;
+	uint64_t now;
+#endif
 
 #ifdef RTE_TEST_PMD_RECORD_CORE_CYCLES
 	start_tsc = rte_rdtsc();
@@ -73,8 +83,55 @@ pkt_burst_io_forward(struct fwd_stream *fs)
 #ifdef RTE_TEST_PMD_RECORD_BURST_STATS
 	fs->rx_burst_stats.pkt_burst_spread[nb_rx]++;
 #endif
+#ifdef RTE_TEST_PMD_NOISY
+	if (bsize_before_send > 0) {
+		if (rte_ring_free_count(ncf->f) >= nb_rx) {
+			/* enqueue into fifo */
+			nb_enqd = fifo_put(ncf->f, pkts_burst, nb_rx);
+			if (nb_enqd < nb_rx)
+				nb_rx = nb_enqd;
+		} else {
+			/* fifo is full, dequeue first */
+			nb_deqd = fifo_get(ncf->f, tmp_pkts, nb_rx);
+			/* enqueue into fifo */
+			nb_enqd = fifo_put(ncf->f, pkts_burst, nb_deqd);
+			if (nb_enqd < nb_rx)
+				nb_rx = nb_enqd;
+			if (nb_deqd > 0)
+				nb_tx = rte_eth_tx_burst(fs->tx_port,
+						fs->tx_queue, tmp_pkts,
+						nb_deqd);
+		}
+	} else {
+		nb_tx = rte_eth_tx_burst(fs->tx_port, fs->tx_queue,
+				pkts_burst, nb_rx);
+	}
+
+	/*
+	 * TX burst queue drain
+	 */
+	if (ncf->prev_time == 0) {
+		now = ncf->prev_time = rte_get_timer_cycles();
+	} else {
+		now = rte_get_timer_cycles();
+	}
+	delta_ms = (now - ncf->prev_time) / freq_khz;
+	if (unlikely(delta_ms >= flush_timer) && flush_timer > 0 && (nb_tx == 0)) {
+		while (fifo_count(ncf->f) > 0) {
+			nb_deqd = fifo_get(ncf->f, tmp_pkts, nb_rx);
+			nb_tx = rte_eth_tx_burst(fs->tx_port, fs->tx_queue,
+						 tmp_pkts, nb_deqd);
+			if(rte_ring_empty(ncf->f))
+				break;
+		}
+		ncf->prev_time = now;
+	}
+	if (nb_tx < nb_rx && fs->retry_enabled)
+		*pkts_burst = *tmp_pkts;
+#else
 	nb_tx = rte_eth_tx_burst(fs->tx_port, fs->tx_queue,
 			pkts_burst, nb_rx);
+#endif
 	/*
 	 * Retry if necessary
 	 */
diff --git a/app/test-pmd/parameters.c b/app/test-pmd/parameters.c
index 2192bdcdf..df0db933a 100644
--- a/app/test-pmd/parameters.c
+++ b/app/test-pmd/parameters.c
@@ -621,6 +621,8 @@ launch_args_parse(int argc, char** argv)
 		{ "print-event",		1, 0, 0 },
 		{ "mask-event",			1, 0, 0 },
 		{ "tx-offloads",		1, 0, 0 },
+		{ "buffersize-before-sending",  1, 0, 0 },
+		{ "flush-timer",                1, 0, 0 },
 		{ 0, 0, 0, 0 },
 	};
 
@@ -1101,7 +1103,24 @@ launch_args_parse(int argc, char** argv)
 					rte_exit(EXIT_FAILURE,
 						 "invalid mask-event argument\n");
 				}
-
+#ifdef RTE_TEST_PMD_NOISY
+			if (!strcmp(lgopts[opt_idx].name, "buffersize-before-sending")) {
+				n = atoi(optarg);
+				if (n > 0)
+					bsize_before_send = (uint16_t) n;
+				else
+					rte_exit(EXIT_FAILURE,
+						 "buffersize-before-sending must be > 0\n");
+			}
+			if (!strcmp(lgopts[opt_idx].name, "flush-timer")) {
+				n = atoi(optarg);
+				if (n >= 0)
+					flush_timer = (uint16_t) n;
+				else
+					rte_exit(EXIT_FAILURE,
+						 "flush-timer must be > 0\n");
+			}
+#endif
 			break;
 		case 'h':
 			usage(argv[0]);
diff --git a/app/test-pmd/testpmd.c b/app/test-pmd/testpmd.c
index 4c0e2586c..7b8ffdc9c 100644
--- a/app/test-pmd/testpmd.c
+++ b/app/test-pmd/testpmd.c
@@ -59,6 +59,9 @@
 #ifdef RTE_LIBRTE_LATENCY_STATS
 #include <rte_latencystats.h>
 #endif
+#ifdef RTE_TEST_PMD_NOISY
+#include "fifo.h"
+#endif
 
 #include "testpmd.h"
 
@@ -249,6 +252,18 @@ int16_t tx_free_thresh = RTE_PMD_PARAM_UNSET;
  */
 int16_t tx_rs_thresh = RTE_PMD_PARAM_UNSET;
 
+#ifdef RTE_TEST_PMD_NOISY
+/*
+ * Configurable value of buffered packed before sending.
+ */
+uint16_t bsize_before_send = 0;
+
+/*
+ * Configurable value of packet buffer timeout.
+ */
+uint16_t flush_timer = 0;
+#endif
+
 /*
  * Receive Side Scaling (RSS) configuration.
  */
@@ -401,6 +416,20 @@ static int all_ports_started(void);
 struct gso_status gso_ports[RTE_MAX_ETHPORTS];
 uint16_t gso_max_segment_size = ETHER_MAX_LEN - ETHER_CRC_LEN;
 
+#ifdef RTE_TEST_PMD_NOISY
+#define STRSIZE 256
+#define NOISY_RING "noisy_ring_%d:%d\n"
+struct rte_ring * fifo_init(uint32_t qi, uint32_t pi)
+{
+	struct noisy_config *n = &noisy_cfg[qi];
+	char name[STRSIZE];
+
+	snprintf(name, STRSIZE, NOISY_RING, pi, qi);
+	n->f = rte_ring_create(name, bsize_before_send, rte_socket_id(), 0);
+	return n->f;
+}
+#endif
+
 /*
  * Helper function to check if socket is already discovered.
  * If yes, return positive value. If not, return zero.
@@ -1584,6 +1613,16 @@ start_port(portid_t pid)
 				return -1;
 			}
 		}
+#ifdef RTE_TEST_PMD_NOISY
+		noisy_cfg = (struct noisy_config *) rte_zmalloc("testpmd noisy fifo and timers",
+					nb_txq * sizeof(struct noisy_config),
+					RTE_CACHE_LINE_SIZE);
+		if (noisy_cfg == NULL) {
+			rte_exit(EXIT_FAILURE,
+					"rte_zmalloc(%d struct noisy_config) failed\n",
+					(int)(nb_txq * sizeof(struct noisy_config)));
+		}
+#endif
 		if (port->need_reconfig_queues > 0) {
 			port->need_reconfig_queues = 0;
 			port->tx_conf.txq_flags = ETH_TXQ_FLAGS_IGNORE;
@@ -1591,6 +1630,11 @@ start_port(portid_t pid)
 			port->tx_conf.offloads = port->dev_conf.txmode.offloads;
 			/* setup tx queues */
 			for (qi = 0; qi < nb_txq; qi++) {
+#ifdef RTE_TEST_PMD_NOISY
+				if (!fifo_init(qi, pi) && bsize_before_send > 0)
+					rte_exit(EXIT_FAILURE, "%s\n",
+						 rte_strerror(rte_errno));
+#endif
 				if ((numa_support) &&
 					(txring_numa[pi] != NUMA_NO_CONFIG))
 					diag = rte_eth_tx_queue_setup(pi, qi,
@@ -1755,6 +1799,10 @@ stop_port(portid_t pid)
 			RTE_PORT_HANDLING, RTE_PORT_STOPPED) == 0)
 			printf("Port %d can not be set into stopped\n", pi);
 		need_check_link_status = 1;
+
+#ifdef  RTE_TEST_PMD_NOISY
+		rte_free(noisy_cfg);
+#endif
 	}
 	if (need_check_link_status && !no_link_check)
 		check_all_ports_link_status(RTE_PORT_ALL);
diff --git a/app/test-pmd/testpmd.h b/app/test-pmd/testpmd.h
index 153abea05..a6c1a17bb 100644
--- a/app/test-pmd/testpmd.h
+++ b/app/test-pmd/testpmd.h
@@ -9,6 +9,9 @@
 #include <rte_bus_pci.h>
 #include <rte_gro.h>
 #include <rte_gso.h>
+#ifdef RTE_TEST_PMD_NOISY
+#include "fifo.h"
+#endif
 
 #define RTE_PORT_ALL            (~(portid_t)0x0)
 
@@ -109,6 +112,15 @@ struct fwd_stream {
 #endif
 };
 
+#ifdef RTE_TEST_PMD_NOISY
+struct noisy_config {
+	struct rte_ring *f;
+	uint64_t prev_time;
+};
+struct noisy_config *noisy_cfg;
+#endif
+
+
 /** Descriptor for a single flow. */
 struct port_flow {
 	size_t size; /**< Allocated space including data[]. */
@@ -382,6 +394,9 @@ extern int8_t rx_drop_en;
 extern int16_t tx_free_thresh;
 extern int16_t tx_rs_thresh;
 
+extern uint16_t bsize_before_send;
+extern uint16_t flush_timer;
+
 extern uint8_t dcb_config;
 extern uint8_t dcb_test;
 
diff --git a/config/common_base b/config/common_base
index c09c7cf88..2fd17439b 100644
--- a/config/common_base
+++ b/config/common_base
@@ -806,6 +806,7 @@ CONFIG_RTE_PROC_INFO=n
 CONFIG_RTE_TEST_PMD=y
 CONFIG_RTE_TEST_PMD_RECORD_CORE_CYCLES=n
 CONFIG_RTE_TEST_PMD_RECORD_BURST_STATS=n
+CONFIG_RTE_TEST_PMD_NOISY=y
 
 #
 # Compile the bbdev test application
-- 
2.14.3