pif: Add helpers to get the name of a pif

Future debugging will want to identify a specific passt interface.  We make
a distinction in these helpers between the name of the *type* of pif, and
name of the pif itself.  For the time being these are always the same
thing, since we have at most instance of each type of pif.  However, that
might change in future.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

3 files changed, 42 insertions, 1 deletions

diff --git a/Makefile b/Makefile
index d14b029..af4fa87 100644
--- a/Makefile
+++ b/Makefile
@@ -46,7 +46,8 @@ FLAGS += -DDUAL_STACK_SOCKETS=$(DUAL_STACK_SOCKETS)
 
 PASST_SRCS = arch.c arp.c checksum.c conf.c dhcp.c dhcpv6.c flow.c icmp.c \
 	igmp.c isolation.c lineread.c log.c mld.c ndp.c netlink.c packet.c \
-	passt.c pasta.c pcap.c port_fwd.c tap.c tcp.c tcp_splice.c udp.c util.c
+	passt.c pasta.c pcap.c pif.c port_fwd.c tap.c tcp.c tcp_splice.c udp.c \
+	util.c
 QRAP_SRCS = qrap.c
 SRCS = $(PASST_SRCS) $(QRAP_SRCS)
 
diff --git a/pif.c b/pif.c
new file mode 100644
index 0000000..ebf01cc
--- /dev/null
+++ b/pif.c
@@ -0,0 +1,21 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later
+ * Copyright Red Hat
+ * Author: David Gibson <david@gibson.dropbear.id.au>
+ *
+ * Passt/pasta interface types and IDs
+ */
+
+#include <stdint.h>
+#include <assert.h>
+
+#include "util.h"
+#include "pif.h"
+
+const char *pif_type_str[] = {
+	[PIF_NONE]		= "<none>",
+	[PIF_HOST]		= "HOST",
+	[PIF_TAP]		= "TAP",
+	[PIF_SPLICE]		= "SPLICE",
+};
+static_assert(ARRAY_SIZE(pif_type_str) == PIF_NUM_TYPES,
+	      "pif_type_str[] doesn't match enum pif_type");
diff --git a/pif.h b/pif.h
index a705f2c..ca85b34 100644
--- a/pif.h
+++ b/pif.h
@@ -22,6 +22,25 @@ enum pif_type {
 	PIF_TAP,
 	/* Namespace socket interface for splicing */
 	PIF_SPLICE,
+
+	PIF_NUM_TYPES,
 };
 
+#define PIF_NAMELEN	8
+
+extern const char *pif_type_str[];
+
+static inline const char *pif_type(enum pif_type pt)
+{
+	if (pt < PIF_NUM_TYPES)
+		return pif_type_str[pt];
+	else
+		return "?";
+}
+
+static inline const char *pif_name(uint8_t pif)
+{
+	return pif_type(pif);
+}
+
 #endif /* PIF_H */