1 files changed, 184 insertions, 0 deletions

diff --git a/sys/dev/netmap/netmap_null.c b/sys/dev/netmap/netmap_null.c
new file mode 100644
index 000000000000..b769ae7ed6e8
--- /dev/null
+++ b/sys/dev/netmap/netmap_null.c
@@ -0,0 +1,184 @@
+/*
+ * Copyright (C) 2018 Giuseppe Lettieri
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+/* $FreeBSD$ */
+
+#if defined(__FreeBSD__)
+#include <sys/cdefs.h> /* prerequisite */
+
+#include <sys/types.h>
+#include <sys/errno.h>
+#include <sys/param.h>	/* defines used in kernel.h */
+#include <sys/kernel.h>	/* types used in module initialization */
+#include <sys/malloc.h>
+#include <sys/poll.h>
+#include <sys/lock.h>
+#include <sys/rwlock.h>
+#include <sys/selinfo.h>
+#include <sys/sysctl.h>
+#include <sys/socket.h> /* sockaddrs */
+#include <net/if.h>
+#include <net/if_var.h>
+#include <machine/bus.h>	/* bus_dmamap_* */
+#include <sys/refcount.h>
+
+
+#elif defined(linux)
+
+#include "bsd_glue.h"
+
+#elif defined(__APPLE__)
+
+#warning OSX support is only partial
+#include "osx_glue.h"
+
+#elif defined(_WIN32)
+#include "win_glue.h"
+
+#else
+
+#error	Unsupported platform
+
+#endif /* unsupported */
+
+/*
+ * common headers
+ */
+
+#include <net/netmap.h>
+#include <dev/netmap/netmap_kern.h>
+#include <dev/netmap/netmap_mem2.h>
+
+#ifdef WITH_NMNULL
+
+static int
+netmap_null_txsync(struct netmap_kring *kring, int flags)
+{
+	(void)kring;
+	(void)flags;
+	return 0;
+}
+
+static int
+netmap_null_rxsync(struct netmap_kring *kring, int flags)
+{
+	(void)kring;
+	(void)flags;
+	return 0;
+}
+
+static int
+netmap_null_krings_create(struct netmap_adapter *na)
+{
+	return netmap_krings_create(na, 0);
+}
+
+static void
+netmap_null_krings_delete(struct netmap_adapter *na)
+{
+	netmap_krings_delete(na);
+}
+
+static int
+netmap_null_reg(struct netmap_adapter *na, int onoff)
+{
+	if (na->active_fds == 0) {
+		if (onoff)
+			na->na_flags |= NAF_NETMAP_ON;
+		else
+			na->na_flags &= ~NAF_NETMAP_ON;
+	}
+	return 0;
+}
+
+static int
+netmap_null_bdg_attach(const char *name, struct netmap_adapter *na,
+		struct nm_bridge *b)
+{
+	(void)name;
+	(void)na;
+	(void)b;
+	return EINVAL;
+}
+
+int
+netmap_get_null_na(struct nmreq_header *hdr, struct netmap_adapter **na,
+		struct netmap_mem_d *nmd, int create)
+{
+	struct nmreq_register *req = (struct nmreq_register *)(uintptr_t)hdr->nr_body;
+	struct netmap_null_adapter *nna;
+	int error;
+
+	if (req->nr_mode != NR_REG_NULL) {
+		nm_prdis("not a null port");
+		return 0;
+	}
+
+	if (!create) {
+		nm_prerr("null ports cannot be re-opened");
+		return EINVAL;
+	}
+
+	if (nmd == NULL) {
+		nm_prerr("null ports must use an existing allocator");
+		return EINVAL;
+	}
+
+	nna = nm_os_malloc(sizeof(*nna));
+	if (nna == NULL) {
+		error = ENOMEM;
+		goto err;
+	}
+	snprintf(nna->up.name, sizeof(nna->up.name), "null:%s", hdr->nr_name);
+
+	nna->up.nm_txsync = netmap_null_txsync;
+	nna->up.nm_rxsync = netmap_null_rxsync;
+	nna->up.nm_register = netmap_null_reg;
+	nna->up.nm_krings_create = netmap_null_krings_create;
+	nna->up.nm_krings_delete = netmap_null_krings_delete;
+	nna->up.nm_bdg_attach = netmap_null_bdg_attach;
+	nna->up.nm_mem = netmap_mem_get(nmd);
+
+	nna->up.num_tx_rings = req->nr_tx_rings;
+	nna->up.num_rx_rings = req->nr_rx_rings;
+	nna->up.num_tx_desc = req->nr_tx_slots;
+	nna->up.num_rx_desc = req->nr_rx_slots;
+	error = netmap_attach_common(&nna->up);
+	if (error)
+		goto free_nna;
+	*na = &nna->up;
+	netmap_adapter_get(*na);
+	nm_prdis("created null %s", nna->up.name);
+
+	return 0;
+
+free_nna:
+	nm_os_free(nna);
+err:
+	return error;
+}
+
+
+#endif /* WITH_NMNULL */