net/softnic: add tap object

Add tap object implementation to the softnic.

Signed-off-by: Cristian Dumitrescu <cristian.dumitrescu@intel.com>
Signed-off-by: Jasvinder Singh <jasvinder.singh@intel.com>

drivers/net/softnic/Makefile

@@ -26,6 +26,7 @@ SRCS-$(CONFIG_RTE_LIBRTE_PMD_SOFTNIC) += rte_eth_softnic_mempool.c
 SRCS-$(CONFIG_RTE_LIBRTE_PMD_SOFTNIC) += rte_eth_softnic_swq.c
 SRCS-$(CONFIG_RTE_LIBRTE_PMD_SOFTNIC) += rte_eth_softnic_link.c
 SRCS-$(CONFIG_RTE_LIBRTE_PMD_SOFTNIC) += rte_eth_softnic_tm.c
+SRCS-$(CONFIG_RTE_LIBRTE_PMD_SOFTNIC) += rte_eth_softnic_tap.c
 
 #
 # Export include files

drivers/net/softnic/meson.build

@@ -6,5 +6,6 @@ sources = files('rte_eth_softnic_tm.c',
 	'rte_eth_softnic.c',
 	'rte_eth_softnic_mempool.c',
 	'rte_eth_softnic_swq.c',
-	'rte_eth_softnic_link.c')
+	'rte_eth_softnic_link.c',
+	'rte_eth_softnic_tap.c')
 deps += 'sched'

drivers/net/softnic/rte_eth_softnic.c

@@ -219,6 +219,7 @@ pmd_init(struct pmd_params *params)
 	softnic_mempool_init(p);
 	softnic_swq_init(p);
 	softnic_link_init(p);
+	softnic_tap_init(p);
 
 	return p;
 }
@@ -229,6 +230,7 @@ pmd_free(struct pmd_internals *p)
 	if (p == NULL)
 		return;
 
+	softnic_tap_free(p);
 	softnic_link_free(p);
 	softnic_swq_free(p);
 	softnic_mempool_free(p);

drivers/net/softnic/rte_eth_softnic_internals.h

@@ -200,6 +200,17 @@ struct tm_internals {
 	struct rte_sched_port *sched;
 };
 
+/**
+ * TAP
+ */
+struct softnic_tap {
+	TAILQ_ENTRY(softnic_tap) node;
+	char name[NAME_SIZE];
+	int fd;
+};
+
+TAILQ_HEAD(softnic_tap_list, softnic_tap);
+
 /**
  * PMD Internals
  */
@@ -215,6 +226,7 @@ struct pmd_internals {
 	struct softnic_mempool_list mempool_list;
 	struct softnic_swq_list swq_list;
 	struct softnic_link_list link_list;
+	struct softnic_tap_list tap_list;
 };
 
 /**
@@ -294,4 +306,21 @@ tm_used(struct rte_eth_dev *dev __rte_unused)
 	return 0;
 }
 
+/**
+ * TAP
+ */
+int
+softnic_tap_init(struct pmd_internals *p);
+
+void
+softnic_tap_free(struct pmd_internals *p);
+
+struct softnic_tap *
+softnic_tap_find(struct pmd_internals *p,
+	const char *name);
+
+struct softnic_tap *
+softnic_tap_create(struct pmd_internals *p,
+	const char *name);
+
 #endif /* __INCLUDE_RTE_ETH_SOFTNIC_INTERNALS_H__ */

drivers/net/softnic/rte_eth_softnic_tap.c

@@ -0,0 +1,118 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2010-2018 Intel Corporation
+ */
+
+#include <netinet/in.h>
+#ifdef RTE_EXEC_ENV_LINUXAPP
+#include <linux/if.h>
+#include <linux/if_tun.h>
+#endif
+#include <sys/ioctl.h>
+
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <rte_string_fns.h>
+
+#include "rte_eth_softnic_internals.h"
+
+#define TAP_DEV                                            "/dev/net/tun"
+
+int
+softnic_tap_init(struct pmd_internals *p)
+{
+	TAILQ_INIT(&p->tap_list);
+
+	return 0;
+}
+
+void
+softnic_tap_free(struct pmd_internals *p)
+{
+	for ( ; ; ) {
+		struct softnic_tap *tap;
+
+		tap = TAILQ_FIRST(&p->tap_list);
+		if (tap == NULL)
+			break;
+
+		TAILQ_REMOVE(&p->tap_list, tap, node);
+		free(tap);
+	}
+}
+
+struct softnic_tap *
+softnic_tap_find(struct pmd_internals *p,
+	const char *name)
+{
+	struct softnic_tap *tap;
+
+	if (name == NULL)
+		return NULL;
+
+	TAILQ_FOREACH(tap, &p->tap_list, node)
+		if (strcmp(tap->name, name) == 0)
+			return tap;
+
+	return NULL;
+}
+
+#ifndef RTE_EXEC_ENV_LINUXAPP
+
+struct softnic_tap *
+softnic_tap_create(struct pmd_internals *p __rte_unused,
+	const char *name __rte_unused)
+{
+	return NULL;
+}
+
+#else
+
+struct softnic_tap *
+softnic_tap_create(struct pmd_internals *p,
+	const char *name)
+{
+	struct softnic_tap *tap;
+	struct ifreq ifr;
+	int fd, status;
+
+	/* Check input params */
+	if (name == NULL ||
+		softnic_tap_find(p, name))
+		return NULL;
+
+	/* Resource create */
+	fd = open(TAP_DEV, O_RDWR | O_NONBLOCK);
+	if (fd < 0)
+		return NULL;
+
+	memset(&ifr, 0, sizeof(ifr));
+	ifr.ifr_flags = IFF_TAP | IFF_NO_PI; /* No packet information */
+	snprintf(ifr.ifr_name, IFNAMSIZ, "%s", name);
+
+	status = ioctl(fd, TUNSETIFF, (void *)&ifr);
+	if (status < 0) {
+		close(fd);
+		return NULL;
+	}
+
+	/* Node allocation */
+	tap = calloc(1, sizeof(struct softnic_tap));
+	if (tap == NULL) {
+		close(fd);
+		return NULL;
+	}
+	/* Node fill in */
+	strlcpy(tap->name, name, sizeof(tap->name));
+	tap->fd = fd;
+
+	/* Node add to list */
+	TAILQ_INSERT_TAIL(&p->tap_list, tap, node);
+
+	return tap;
+}
+
+#endif