[dpdk-dev] [PATCH] net/virtio-user: specify the MAC of the tap

[Ning Li]

When using virtio-user with vhost-kernel to exchange
packet with kernel networking stack, application can
set the MAC of the tap interface via parameter.

Signed-off-by: Ning Li <muziding001 at 163.com>
---
 drivers/net/virtio/virtio_user/vhost_kernel.c     |  3 ++-
 drivers/net/virtio/virtio_user/vhost_kernel_tap.c | 14 +++++++++++++-
 drivers/net/virtio/virtio_user/vhost_kernel_tap.h |  3 ++-
 3 files changed, 17 insertions(+), 3 deletions(-)

diff --git a/drivers/net/virtio/virtio_user/vhost_kernel.c b/drivers/net/virtio/virtio_user/vhost_kernel.c
index 68d28b1..dd24b6b 100644
--- a/drivers/net/virtio/virtio_user/vhost_kernel.c
+++ b/drivers/net/virtio/virtio_user/vhost_kernel.c
@@ -380,7 +380,8 @@ struct vhost_memory_kernel {
 	else
 		hdr_size = sizeof(struct virtio_net_hdr);
 
-	tapfd = vhost_kernel_open_tap(&dev->ifname, hdr_size, req_mq);
+	tapfd = vhost_kernel_open_tap(&dev->ifname, hdr_size, req_mq,
+			 (char *)dev->mac_addr);
 	if (tapfd < 0) {
 		PMD_DRV_LOG(ERR, "fail to open tap for vhost kernel");
 		return -1;
diff --git a/drivers/net/virtio/virtio_user/vhost_kernel_tap.c b/drivers/net/virtio/virtio_user/vhost_kernel_tap.c
index 689a5cf..d036428 100644
--- a/drivers/net/virtio/virtio_user/vhost_kernel_tap.c
+++ b/drivers/net/virtio/virtio_user/vhost_kernel_tap.c
@@ -36,15 +36,19 @@
 #include <sys/stat.h>
 #include <fcntl.h>
 #include <net/if.h>
+#include <net/if_arp.h>
 #include <errno.h>
 #include <string.h>
 #include <limits.h>
 
+#include <rte_ether.h>
+
 #include "vhost_kernel_tap.h"
 #include "../virtio_logs.h"
 
 int
-vhost_kernel_open_tap(char **p_ifname, int hdr_size, int req_mq)
+vhost_kernel_open_tap(char **p_ifname, int hdr_size, int req_mq,
+			 const char *mac)
 {
 	unsigned int tap_features;
 	int sndbuf = INT_MAX;
@@ -123,6 +127,14 @@
 		PMD_DRV_LOG(ERR, "TUNSETOFFLOAD ioctl() failed: %s",
 			   strerror(errno));
 
+	memset(&ifr, 0, sizeof(ifr));
+	ifr.ifr_hwaddr.sa_family = ARPHRD_ETHER;
+	memcpy(ifr.ifr_hwaddr.sa_data, mac, ETHER_ADDR_LEN);
+	if (ioctl(tapfd, SIOCSIFHWADDR, (void *)&ifr) == -1) {
+		PMD_DRV_LOG(ERR, "SIOCSIFHWADDR failed: %s", strerror(errno));
+		goto error;
+	}
+
 	if (!(*p_ifname))
 		*p_ifname = strdup(ifr.ifr_name);
 
diff --git a/drivers/net/virtio/virtio_user/vhost_kernel_tap.h b/drivers/net/virtio/virtio_user/vhost_kernel_tap.h
index eae340c..402f964 100644
--- a/drivers/net/virtio/virtio_user/vhost_kernel_tap.h
+++ b/drivers/net/virtio/virtio_user/vhost_kernel_tap.h
@@ -64,4 +64,5 @@
 /* Constants */
 #define PATH_NET_TUN	"/dev/net/tun"
 
-int vhost_kernel_open_tap(char **p_ifname, int hdr_size, int req_mq);
+int vhost_kernel_open_tap(char **p_ifname, int hdr_size, int req_mq,
+			 const char *mac);
-- 
1.8.3.1