[PATCH 08/12] examples/generator: import code from basicfwd.c

[Ronan Randles <ronan.randles@intel.com>]

From: Harry van Haaren <harry.van.haaren@intel.com>

Import files from basicfwd.c to act as starting point for
gen library sample app

Signed-off-by: Harry van Haaren <harry.van.haaren@intel.com>
Signed-off-by: Ronan Randles <ronan.randles@intel.com>
---
 examples/generator/main.c      | 226 +++++++++++++++++++++++++++++++++
 examples/generator/meson.build |  12 ++
 2 files changed, 238 insertions(+)
 create mode 100644 examples/generator/main.c
 create mode 100644 examples/generator/meson.build

diff --git a/examples/generator/main.c b/examples/generator/main.c
new file mode 100644
index 0000000000..0082f588b4
--- /dev/null
+++ b/examples/generator/main.c
@@ -0,0 +1,226 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2010-2015 Intel Corporation
+ */
+
+#include <stdint.h>
+#include <inttypes.h>
+#include <rte_eal.h>
+#include <rte_ethdev.h>
+#include <rte_cycles.h>
+#include <rte_lcore.h>
+#include <rte_mbuf.h>
+
+#define RX_RING_SIZE 1024
+#define TX_RING_SIZE 1024
+
+#define NUM_MBUFS 8191
+#define MBUF_CACHE_SIZE 256
+#define BURST_SIZE 32
+
+/* Configuration of ethernet ports. 8<  */
+static const struct rte_eth_conf port_conf_default = {
+	.rxmode = {
+		.max_lro_pkt_size = RTE_ETHER_MAX_LEN,
+	},
+};
+/* >8 End of configuration of ethernet ports. */
+
+/* basicfwd.c: Basic DPDK skeleton forwarding example. */
+
+/*
+ * Initializes a given port using global settings and with the RX buffers
+ * coming from the mbuf_pool passed as a parameter.
+ */
+
+/* Main functional part of port initialization. 8< */
+static inline int
+port_init(uint16_t port, struct rte_mempool *mbuf_pool)
+{
+	struct rte_eth_conf port_conf = port_conf_default;
+	const uint16_t rx_rings = 1, tx_rings = 1;
+	uint16_t nb_rxd = RX_RING_SIZE;
+	uint16_t nb_txd = TX_RING_SIZE;
+	int retval;
+	uint16_t q;
+	struct rte_eth_dev_info dev_info;
+	struct rte_eth_txconf txconf;
+
+	if (!rte_eth_dev_is_valid_port(port))
+		return -1;
+
+	retval = rte_eth_dev_info_get(port, &dev_info);
+	if (retval != 0) {
+		printf("Error during getting device (port %u) info: %s\n",
+				port, strerror(-retval));
+		return retval;
+	}
+
+	if (dev_info.tx_offload_capa & DEV_TX_OFFLOAD_MBUF_FAST_FREE)
+		port_conf.txmode.offloads |=
+			DEV_TX_OFFLOAD_MBUF_FAST_FREE;
+
+	/* Configure the Ethernet device. */
+	retval = rte_eth_dev_configure(port, rx_rings, tx_rings, &port_conf);
+	if (retval != 0)
+		return retval;
+
+	retval = rte_eth_dev_adjust_nb_rx_tx_desc(port, &nb_rxd, &nb_txd);
+	if (retval != 0)
+		return retval;
+
+	/* Allocate and set up 1 RX queue per Ethernet port. */
+	for (q = 0; q < rx_rings; q++) {
+		retval = rte_eth_rx_queue_setup(port, q, nb_rxd,
+				rte_eth_dev_socket_id(port), NULL, mbuf_pool);
+		if (retval < 0)
+			return retval;
+	}
+
+	txconf = dev_info.default_txconf;
+	txconf.offloads = port_conf.txmode.offloads;
+	/* Allocate and set up 1 TX queue per Ethernet port. */
+	for (q = 0; q < tx_rings; q++) {
+		retval = rte_eth_tx_queue_setup(port, q, nb_txd,
+				rte_eth_dev_socket_id(port), &txconf);
+		if (retval < 0)
+			return retval;
+	}
+
+	/* Starting Ethernet port. 8< */
+	retval = rte_eth_dev_start(port);
+	/* >8 End of starting of ethernet port. */
+	if (retval < 0)
+		return retval;
+
+	/* Display the port MAC address. */
+	struct rte_ether_addr addr;
+	retval = rte_eth_macaddr_get(port, &addr);
+	if (retval != 0)
+		return retval;
+
+	printf("Port %u MAC: %02" PRIx8 " %02" PRIx8 " %02" PRIx8
+			   " %02" PRIx8 " %02" PRIx8 " %02" PRIx8 "\n",
+			port, RTE_ETHER_ADDR_BYTES(&addr));
+
+	/* Enable RX in promiscuous mode for the Ethernet device. */
+	retval = rte_eth_promiscuous_enable(port);
+	/* End of setting RX port in promiscuous mode. */
+	if (retval != 0)
+		return retval;
+
+	return 0;
+}
+/* >8 End of main functional part of port initialization. */
+
+/*
+ * The lcore main. This is the main thread that does the work, reading from
+ * an input port and writing to an output port.
+ */
+
+ /* Basic forwarding application lcore. 8< */
+static __rte_noreturn void
+lcore_main(void)
+{
+	uint16_t port;
+
+	/*
+	 * Check that the port is on the same NUMA node as the polling thread
+	 * for best performance.
+	 */
+	RTE_ETH_FOREACH_DEV(port)
+		if (rte_eth_dev_socket_id(port) >= 0 &&
+				rte_eth_dev_socket_id(port) !=
+						(int)rte_socket_id())
+			printf("WARNING, port %u is on remote NUMA node to "
+					"polling thread.\n\tPerformance will "
+					"not be optimal.\n", port);
+
+	printf("\nCore %u forwarding packets. [Ctrl+C to quit]\n",
+			rte_lcore_id());
+
+	/* Main work of application loop. 8< */
+	for (;;) {
+		/*
+		 * Receive packets on a port and forward them on the paired
+		 * port. The mapping is 0 -> 1, 1 -> 0, 2 -> 3, 3 -> 2, etc.
+		 */
+		RTE_ETH_FOREACH_DEV(port) {
+
+			/* Get burst of RX packets, from first port of pair. */
+			struct rte_mbuf *bufs[BURST_SIZE];
+			const uint16_t nb_rx = rte_eth_rx_burst(port, 0,
+					bufs, BURST_SIZE);
+
+			if (unlikely(nb_rx == 0))
+				continue;
+
+			/* Send burst of TX packets, to second port of pair. */
+			const uint16_t nb_tx = rte_eth_tx_burst(port ^ 1, 0,
+					bufs, nb_rx);
+
+			/* Free any unsent packets. */
+			if (unlikely(nb_tx < nb_rx)) {
+				uint16_t buf;
+				for (buf = nb_tx; buf < nb_rx; buf++)
+					rte_pktmbuf_free(bufs[buf]);
+			}
+		}
+	}
+	/* >8 End of loop. */
+}
+/* >8 End Basic forwarding application lcore. */
+
+/*
+ * The main function, which does initialization and calls the per-lcore
+ * functions.
+ */
+int
+main(int argc, char *argv[])
+{
+	struct rte_mempool *mbuf_pool;
+	unsigned int nb_ports;
+	uint16_t portid;
+
+	/* Initializion the Environment Abstraction Layer (EAL). 8< */
+	int ret = rte_eal_init(argc, argv);
+	if (ret < 0)
+		rte_exit(EXIT_FAILURE, "Error with EAL initialization\n");
+	/* >8 End of initializion the Environment Abstraction Layer (EAL). */
+
+	argc -= ret;
+	argv += ret;
+
+	/* Check that there is an even number of ports to send/receive on. */
+	nb_ports = rte_eth_dev_count_avail();
+	if (nb_ports < 2 || (nb_ports & 1))
+		rte_exit(EXIT_FAILURE, "Error: number of ports must be even\n");
+
+	/* Creates a new mempool in memory to hold the mbufs. */
+
+	/* Allocates mempool to hold the mbufs. 8< */
+	mbuf_pool = rte_pktmbuf_pool_create("MBUF_POOL", NUM_MBUFS * nb_ports,
+		MBUF_CACHE_SIZE, 0, RTE_MBUF_DEFAULT_BUF_SIZE, rte_socket_id());
+	/* >8 End of allocating mempool to hold mbuf. */
+
+	if (mbuf_pool == NULL)
+		rte_exit(EXIT_FAILURE, "Cannot create mbuf pool\n");
+
+	/* Initializing all ports. 8< */
+	RTE_ETH_FOREACH_DEV(portid)
+		if (port_init(portid, mbuf_pool) != 0)
+			rte_exit(EXIT_FAILURE, "Cannot init port %"PRIu16 "\n",
+					portid);
+	/* >8 End of initializing all ports. */
+
+	if (rte_lcore_count() > 1)
+		printf("\nWARNING: Too many lcores enabled. Only 1 used.\n");
+
+	/* Call lcore_main on the main core only. Called on single lcore. 8< */
+	lcore_main();
+	/* >8 End of called on single lcore. */
+
+	/* clean up the EAL */
+	rte_eal_cleanup();
+
+	return 0;
+}
diff --git a/examples/generator/meson.build b/examples/generator/meson.build
new file mode 100644
index 0000000000..441678bbe5
--- /dev/null
+++ b/examples/generator/meson.build
@@ -0,0 +1,12 @@
+# SPDX-License-Identifier: BSD-3-Clause
+# Copyright(c) 2017 Intel Corporation
+
+# meson file, for building this example as part of a main DPDK build.
+#
+# To build this example as a standalone application with an already-installed
+# DPDK instance, use 'make'
+
+allow_experimental_apis = true
+sources = files(
+        'main.c',
+)
-- 
2.25.1