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diff --git a/extras/libmemif/examples/icmp_responder/main.c b/extras/libmemif/examples/icmp_responder/main.c
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+/*
+ *------------------------------------------------------------------
+ * Copyright (c) 2017 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *------------------------------------------------------------------
+ */
+
+#include <stdlib.h>
+#include <stdint.h>
+#include <net/if.h>
+#include <sys/types.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <sys/uio.h>
+#include <sys/mman.h>
+#include <sys/prctl.h>
+#include <inttypes.h>
+#include <string.h>
+#include <stdio.h>
+#include <netdb.h>
+#include <linux/ip.h>
+#include <linux/icmp.h>
+#include <arpa/inet.h>
+#include <stdlib.h>
+#include <netinet/if_ether.h>
+#include <net/if_arp.h>
+#include <asm/byteorder.h>
+#include <byteswap.h>
+#include <string.h>
+#include <sys/epoll.h>
+#include <errno.h>
+#include <unistd.h>
+#include <signal.h>
+
+#include <libmemif.h>
+#include <icmp_proto.h>
+
+#define APP_NAME "ICMP_Responder"
+#define IF_NAME "memif_connection"
+
+
+#ifdef ICMP_DBG
+#define DBG(...) do { \
+ printf (APP_NAME":%s:%d: ", __func__, __LINE__); \
+ printf (__VA_ARGS__); \
+ printf ("\n"); \
+ } while (0)
+#else
+#define DBG(...)
+#endif
+
+#define INFO(...) do { \
+ printf ("INFO: "__VA_ARGS__); \
+ printf ("\n"); \
+ } while (0)
+
+/* maximum tx/rx memif buffers */
+#define MAX_MEMIF_BUFS 256
+
+typedef struct
+{
+ uint16_t index;
+ /* memif conenction handle */
+ memif_conn_handle_t conn;
+ /* transmit queue id */
+ uint16_t tx_qid;
+ /* tx buffers */
+ memif_buffer_t *tx_bufs;
+ /* allocated tx buffers counter */
+ /* number of tx buffers pointing to shared memory */
+ uint16_t tx_buf_num;
+ /* rx buffers */
+ memif_buffer_t *rx_bufs;
+ /* allcoated rx buffers counter */
+ /* number of rx buffers pointing to shared memory */
+ uint16_t rx_buf_num;
+ /* interface ip address */
+ uint8_t ip_addr[4];
+} memif_connection_t;
+
+memif_connection_t memif_connection;
+int epfd;
+
+static void
+print_memif_details ()
+{
+ memif_connection_t *c = &memif_connection;
+ printf ("MEMIF DETAILS\n");
+ printf ("==============================\n");
+
+
+ memif_details_t md;
+ memset (&md, 0, sizeof (md));
+ ssize_t buflen = 2048;
+ char *buf = malloc (buflen);
+ memset (buf, 0, buflen);
+ int err, e;
+
+ err = memif_get_details (c->conn, &md, buf, buflen);
+ if (err != MEMIF_ERR_SUCCESS)
+ {
+ INFO ("%s", memif_strerror (err));
+ if (err == MEMIF_ERR_NOCONN)
+ {
+ free (buf);
+ return;
+ }
+ }
+
+ printf ("\tinterface name: %s\n", (char *) md.if_name);
+ printf ("\tapp name: %s\n", (char *) md.inst_name);
+ printf ("\tremote interface name: %s\n", (char *) md.remote_if_name);
+ printf ("\tremote app name: %s\n", (char *) md.remote_inst_name);
+ printf ("\tid: %u\n", md.id);
+ printf ("\tsecret: %s\n", (char *) md.secret);
+ printf ("\trole: ");
+ if (md.role)
+ printf ("slave\n");
+ else
+ printf ("master\n");
+ printf ("\tmode: ");
+ switch (md.mode)
+ {
+ case 0:
+ printf ("ethernet\n");
+ break;
+ case 1:
+ printf ("ip\n");
+ break;
+ case 2:
+ printf ("punt/inject\n");
+ break;
+ default:
+ printf ("unknown\n");
+ break;
+ }
+ printf ("\tsocket filename: %s\n", (char *) md.socket_filename);
+ printf ("\tsocket filename: %s\n", (char *) md.socket_filename);
+ printf ("\trx queues:\n");
+ for (e = 0; e < md.rx_queues_num; e++)
+ {
+ printf ("\t\tqueue id: %u\n", md.rx_queues[e].qid);
+ printf ("\t\tring size: %u\n", md.rx_queues[e].ring_size);
+ printf ("\t\tbuffer size: %u\n", md.rx_queues[e].buffer_size);
+ }
+ printf ("\ttx queues:\n");
+ for (e = 0; e < md.tx_queues_num; e++)
+ {
+ printf ("\t\tqueue id: %u\n", md.tx_queues[e].qid);
+ printf ("\t\tring size: %u\n", md.tx_queues[e].ring_size);
+ printf ("\t\tbuffer size: %u\n", md.tx_queues[e].buffer_size);
+ }
+ printf ("\tlink: ");
+ if (md.link_up_down)
+ printf ("up\n");
+ else
+ printf ("down\n");
+
+ free (buf);
+}
+
+/* informs user about connected status. private_ctx is used by user to identify connection
+ (multiple connections WIP) */
+int
+on_connect (memif_conn_handle_t conn, void *private_ctx)
+{
+ INFO ("memif connected!");
+ return 0;
+}
+
+/* informs user about disconnected status. private_ctx is used by user to identify connection
+ (multiple connections WIP) */
+int
+on_disconnect (memif_conn_handle_t conn, void *private_ctx)
+{
+ INFO ("memif disconnected!");
+ return 0;
+}
+
+int
+icmpr_memif_delete ()
+{
+ int err;
+ /* disconenct then delete memif connection */
+ err = memif_delete (&(&memif_connection)->conn);
+ if (err != MEMIF_ERR_SUCCESS)
+ INFO ("memif_delete: %s", memif_strerror (err));
+ return 0;
+}
+
+void
+print_help ()
+{
+ printf ("LIBMEMIF EXAMPLE APP: %s", APP_NAME);
+#ifdef ICMP_DBG
+ printf (" (debug)");
+#endif
+ printf ("\n");
+ printf ("==============================\n");
+ printf ("libmemif version: %s", LIBMEMIF_VERSION);
+#ifdef MEMIF_DBG
+ printf (" (debug)");
+#endif
+ printf ("\n");
+ printf ("memif version: %d\n", MEMIF_VERSION);
+ printf ("\tuse CTRL+C to exit\n");
+}
+
+int
+icmpr_buffer_alloc (long n, uint16_t qid)
+{
+ memif_connection_t *c = &memif_connection;
+ int err;
+ uint16_t r;
+ /* set data pointer to shared memory and set buffer_len to shared mmeory buffer len */
+ err = memif_buffer_alloc (c->conn, qid, c->tx_bufs, n, &r);
+ if (err != MEMIF_ERR_SUCCESS)
+ {
+ INFO ("memif_buffer_alloc: %s", memif_strerror (err));
+ c->tx_buf_num += r;
+ return -1;
+ }
+ c->tx_buf_num += r;
+ DBG ("allocated %d/%ld buffers, %u free buffers", r, n,
+ MAX_MEMIF_BUFS - c->tx_buf_num);
+ return 0;
+}
+
+int
+icmpr_tx_burst (uint16_t qid)
+{
+ memif_connection_t *c = &memif_connection;
+ int err;
+ uint16_t r;
+ /* inform peer memif interface about data in shared memory buffers */
+ /* mark memif buffers as free */
+ err = memif_tx_burst (c->conn, qid, c->tx_bufs, c->tx_buf_num, &r);
+ if (err != MEMIF_ERR_SUCCESS)
+ INFO ("memif_tx_burst: %s", memif_strerror (err));
+ DBG ("tx: %d/%u", r, c->tx_buf_num);
+ c->tx_buf_num -= r;
+ return 0;
+}
+
+int
+icmpr_free ()
+{
+ /* application cleanup */
+ int err;
+ memif_connection_t *c = &memif_connection;
+ free (c->tx_bufs);
+ c->tx_bufs = NULL;
+ free (c->rx_bufs);
+ c->rx_bufs = NULL;
+
+ err = memif_cleanup ();
+ if (err != MEMIF_ERR_SUCCESS)
+ INFO ("memif_delete: %s", memif_strerror (err));
+
+ return 0;
+}
+
+void
+icmpr_exit (int sig)
+{
+ printf ("\n");
+ icmpr_memif_delete ();
+ icmpr_free ();
+ exit (EXIT_SUCCESS);
+}
+
+/* called when event is polled on interrupt file descriptor.
+ there are packets in shared memory ready to be received */
+int
+on_interrupt (memif_conn_handle_t conn, void *private_ctx, uint16_t qid)
+{
+ DBG ("interrupted");
+ memif_connection_t *c = &memif_connection;
+ int err;
+ uint16_t rx;
+ /* receive data from shared memory buffers */
+ err = memif_rx_burst (c->conn, qid, c->rx_bufs, MAX_MEMIF_BUFS, &rx);
+ c->rx_buf_num += rx;
+
+ DBG ("received %d buffers. %u/%u alloc/free buffers",
+ rx, c->rx_buf_num, MAX_MEMIF_BUFS - c->rx_buf_num);
+
+ if (icmpr_buffer_alloc (rx, c->tx_qid) < 0)
+ {
+ INFO ("buffer_alloc error");
+ goto error;
+ }
+ int i;
+ for (i = 0; i < rx; i++)
+ {
+ resolve_packet ((void *) (c->rx_bufs + i)->data,
+ (c->rx_bufs + i)->data_len,
+ (void *) (c->tx_bufs + i)->data,
+ &(c->tx_bufs + i)->data_len, c->ip_addr);
+ }
+
+ uint16_t fb;
+ /* mark memif buffers and shared memory buffers as free */
+ err = memif_buffer_free (c->conn, qid, c->rx_bufs, rx, &fb);
+ c->rx_buf_num -= fb;
+
+ DBG ("freed %d buffers. %u/%u alloc/free buffers",
+ fb, c->rx_buf_num, MAX_MEMIF_BUFS - c->rx_buf_num);
+
+ icmpr_tx_burst (c->tx_qid);
+
+ return 0;
+
+error:
+ err = memif_buffer_free (c->conn, qid, c->rx_bufs, rx, &fb);
+ if (err != MEMIF_ERR_SUCCESS)
+ INFO ("memif_buffer_free: %s", memif_strerror (err));
+ c->rx_buf_num -= fb;
+ DBG ("freed %d buffers. %u/%u alloc/free buffers",
+ fb, c->rx_buf_num, MAX_MEMIF_BUFS - c->rx_buf_num);
+ return 0;
+}
+
+int
+icmpr_memif_create (int is_master)
+{
+ /* setting memif connection arguments */
+ memif_conn_args_t args;
+ int fd = -1;
+ memset (&args, 0, sizeof (args));
+ args.is_master = is_master;
+ args.log2_ring_size = 10;
+ args.buffer_size = 2048;
+ args.num_s2m_rings = 2;
+ args.num_m2s_rings = 2;
+ strncpy ((char *) args.interface_name, IF_NAME, strlen (IF_NAME));
+ strncpy ((char *) args.instance_name, APP_NAME, strlen (APP_NAME));
+ args.mode = 0;
+ /* socket filename is not specified, because this app is supposed to
+ connect to VPP over memif. so default socket filename will be used */
+ /* default socketfile = /run/vpp/memif.sock */
+
+ args.interface_id = 0;
+ /* last argument for memif_create (void * private_ctx) is used by user
+ to identify connection. this context is returned with callbacks */
+ int err = memif_create (&(&memif_connection)->conn,
+ &args, on_connect, on_disconnect, on_interrupt,
+ NULL);
+ if (err != MEMIF_ERR_SUCCESS)
+ INFO ("memif_create: %s", memif_strerror (err));
+ return 0;
+}
+
+int
+main (int argc, char *argv[])
+{
+ memif_connection_t *c = &memif_connection;
+
+ signal (SIGINT, icmpr_exit);
+
+ /* initialize global memif connection handle */
+ c->conn = NULL;
+ if (argc == 1)
+ c->tx_qid = 0;
+ else
+ {
+ char *end;
+ c->tx_qid = strtol (argv[1], &end, 10);
+ }
+ INFO ("tx qid: %u", c->tx_qid);
+ /* alloc memif buffers */
+ c->rx_buf_num = 0;
+ c->rx_bufs =
+ (memif_buffer_t *) malloc (sizeof (memif_buffer_t) * MAX_MEMIF_BUFS);
+ c->tx_buf_num = 0;
+ c->tx_bufs =
+ (memif_buffer_t *) malloc (sizeof (memif_buffer_t) * MAX_MEMIF_BUFS);
+ c->ip_addr[0] = 192;
+ c->ip_addr[1] = 168;
+ c->ip_addr[2] = 1;
+ c->ip_addr[3] = 2;
+ /* initialize memory interface */
+ int err;
+ /* if valid callback is passed as argument, fd event polling will be done by user
+ all file descriptors and events will be passed to user in this callback */
+ /* if callback is set to NULL libmemif will handle fd event polling */
+ err = memif_init (NULL, APP_NAME);
+ if (err != MEMIF_ERR_SUCCESS)
+ INFO ("memif_init: %s", memif_strerror (err));
+
+ print_help ();
+
+ icmpr_memif_create (0);
+ print_memif_details ();
+
+ /* main loop */
+ while (1)
+ {
+ if (memif_poll_event (-1) < 0)
+ {
+ DBG ("poll_event error!");
+ }
+ }
+}