[dpdk-dev] [PATCH] net/virtio-user: fix multiqueue support with vhost kernel

[Tiwei Bie <tiwei.bie@intel.com>]

The multiqueue support in virtio-user with vhost kernel backend
is broken when tap name isn't specified by users explicitly,
because the tap name returned by ioctl(TUNSETIFF) isn't saved
properly, and multiple tap interfaces will be created in this
case. Fix this by saving the dynamically allocated tap name
first before reusing the ifr structure. Besides, also make it
possible to support the format string in tap name (e.g. foo%d)
specified by users explicitly.

Fixes: 791b43e08842 ("net/virtio-user: specify MAC of the tap")
Cc: stable@dpdk.org

Reported-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: Tiwei Bie <tiwei.bie@intel.com>
---
 drivers/net/virtio/virtio_user/vhost_kernel_tap.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/net/virtio/virtio_user/vhost_kernel_tap.c b/drivers/net/virtio/virtio_user/vhost_kernel_tap.c
index a3faf1d0c..fbd9e979d 100644
--- a/drivers/net/virtio/virtio_user/vhost_kernel_tap.c
+++ b/drivers/net/virtio/virtio_user/vhost_kernel_tap.c
@@ -62,6 +62,7 @@ vhost_kernel_open_tap(char **p_ifname, int hdr_size, int req_mq,
 			 const char *mac, uint64_t features)
 {
 	unsigned int tap_features;
+	char *tap_name = NULL;
 	int sndbuf = INT_MAX;
 	struct ifreq ifr;
 	int tapfd;
@@ -112,6 +113,12 @@ vhost_kernel_open_tap(char **p_ifname, int hdr_size, int req_mq,
 		goto error;
 	}
 
+	tap_name = strdup(ifr.ifr_name);
+	if (!tap_name) {
+		PMD_DRV_LOG(ERR, "strdup ifname failed: %s", strerror(errno));
+		goto error;
+	}
+
 	fcntl(tapfd, F_SETFL, O_NONBLOCK);
 
 	if (ioctl(tapfd, TUNSETVNETHDRSZ, &hdr_size) < 0) {
@@ -134,11 +141,12 @@ vhost_kernel_open_tap(char **p_ifname, int hdr_size, int req_mq,
 		goto error;
 	}
 
-	if (!(*p_ifname))
-		*p_ifname = strdup(ifr.ifr_name);
+	free(*p_ifname);
+	*p_ifname = tap_name;
 
 	return tapfd;
 error:
+	free(tap_name);
 	close(tapfd);
 	return -1;
 }
-- 
2.17.1