[PATCH v2] graph: fix pcapng file support

[Stephen Hemminger <stephen@networkplumber.org>]

The interface to rte_pcapng changed in last release
so that the interfaces used need to be added to the pcapng
file via the API. If this step is missing the pcapng
file will not be valid and can't be read by wireshark etc.

Fixes: d1da6d0d04c7 ("pcapng: require per-interface information")
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 lib/graph/graph_pcap.c | 25 ++++++++++++++++++++++---
 1 file changed, 22 insertions(+), 3 deletions(-)

diff --git a/lib/graph/graph_pcap.c b/lib/graph/graph_pcap.c
index 6c433300290b..db722c375fa7 100644
--- a/lib/graph/graph_pcap.c
+++ b/lib/graph/graph_pcap.c
@@ -7,6 +7,7 @@
 #include <stdlib.h>
 #include <unistd.h>
 
+#include <rte_ethdev.h>
 #include <rte_mbuf.h>
 #include <rte_pcapng.h>
 
@@ -80,7 +81,8 @@ graph_pcap_default_path_get(char **dir_path)
 int
 graph_pcap_file_open(const char *filename)
 {
-	int fd;
+	int fd, ret;
+	uint16_t portid;
 	char file_name[RTE_GRAPH_PCAP_FILE_SZ];
 	char *pcap_dir;
 
@@ -110,12 +112,29 @@ graph_pcap_file_open(const char *filename)
 				      NULL);
 	if (pcapng_fd == NULL) {
 		graph_err("Graph rte_pcapng_fdopen failed.");
-		close(fd);
-		return -1;
+		goto error;
+	}
+
+	/* Add the configured interfaces as possible capture ports */
+	RTE_ETH_FOREACH_DEV(portid) {
+		ret = rte_pcapng_add_interface(pcapng_fd, portid,
+					       NULL, NULL, NULL);
+		if (ret < 0) {
+			graph_err("Graph rte_pcapng_add_interface port %u failed: %d",
+				  portid, ret);
+			goto error;
+		}
 	}
 
 done:
 	return 0;
+error:
+	if (pcapng_fd != NULL) {
+		rte_pcapng_close(pcapng_fd);
+		pcapng_fd = NULL;
+	}
+	close(fd);
+	return -1;
 }
 
 int
-- 
2.39.2