[dpdk-dev] [PATCH v2 3/3] net/virtio_user: fix dev not freed after init error

[Jianfeng Tan]

Currently, when virtio_user device fails to be started (e.g., vhost
unix socket does not exit), the init function does not return struct
rte_eth_dev (and some other structs) back to ether layer. And what's
more, it does not report the error to upper layer.

The fix is to free those structs and report error when failing to
start virtio_user devices.

Fixes: ce2eabdd43ec ("net/virtio-user: add virtual device")

Signed-off-by: Jianfeng Tan <jianfeng.tan at intel.com>
---
 drivers/net/virtio/virtio_user_ethdev.c | 42 ++++++++++++++++++++-------------
 1 file changed, 26 insertions(+), 16 deletions(-)

diff --git a/drivers/net/virtio/virtio_user_ethdev.c b/drivers/net/virtio/virtio_user_ethdev.c
index daef09b..bba7402 100644
--- a/drivers/net/virtio/virtio_user_ethdev.c
+++ b/drivers/net/virtio/virtio_user_ethdev.c
@@ -313,6 +313,17 @@ virtio_user_eth_dev_alloc(const char *name)
 	return eth_dev;
 }
 
+static void
+virtio_user_eth_dev_free(struct rte_eth_dev *eth_dev)
+{
+	struct rte_eth_dev_data *data = eth_dev->data;
+	struct virtio_hw *hw = data->dev_private;
+
+	rte_free(hw->virtio_user_dev);
+	rte_free(hw);
+	rte_eth_dev_release_port(eth_dev);
+}
+
 /* Dev initialization routine. Invoked once for each virtio vdev at
  * EAL init time, see rte_eal_dev_init().
  * Returns 0 on success.
@@ -343,9 +354,8 @@ virtio_user_pmd_devinit(const char *name, const char *params)
 	}
 
 	if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_PATH) == 1) {
-		ret = rte_kvargs_process(kvlist, VIRTIO_USER_ARG_PATH,
-					 &get_string_arg, &path);
-		if (ret < 0) {
+		if (rte_kvargs_process(kvlist, VIRTIO_USER_ARG_PATH,
+				       &get_string_arg, &path) < 0) {
 			PMD_INIT_LOG(ERR, "error to parse %s",
 				     VIRTIO_USER_ARG_PATH);
 			goto end;
@@ -357,9 +367,8 @@ virtio_user_pmd_devinit(const char *name, const char *params)
 	}
 
 	if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_MAC) == 1) {
-		ret = rte_kvargs_process(kvlist, VIRTIO_USER_ARG_MAC,
-					 &get_string_arg, &mac_addr);
-		if (ret < 0) {
+		if (rte_kvargs_process(kvlist, VIRTIO_USER_ARG_MAC,
+				       &get_string_arg, &mac_addr) < 0) {
 			PMD_INIT_LOG(ERR, "error to parse %s",
 				     VIRTIO_USER_ARG_MAC);
 			goto end;
@@ -367,9 +376,8 @@ virtio_user_pmd_devinit(const char *name, const char *params)
 	}
 
 	if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_QUEUE_SIZE) == 1) {
-		ret = rte_kvargs_process(kvlist, VIRTIO_USER_ARG_QUEUE_SIZE,
-					 &get_integer_arg, &queue_size);
-		if (ret < 0) {
+		if (rte_kvargs_process(kvlist, VIRTIO_USER_ARG_QUEUE_SIZE,
+				       &get_integer_arg, &queue_size) < 0) {
 			PMD_INIT_LOG(ERR, "error to parse %s",
 				     VIRTIO_USER_ARG_QUEUE_SIZE);
 			goto end;
@@ -377,9 +385,8 @@ virtio_user_pmd_devinit(const char *name, const char *params)
 	}
 
 	if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_QUEUES_NUM) == 1) {
-		ret = rte_kvargs_process(kvlist, VIRTIO_USER_ARG_QUEUES_NUM,
-					 &get_integer_arg, &queues);
-		if (ret < 0) {
+		if (rte_kvargs_process(kvlist, VIRTIO_USER_ARG_QUEUES_NUM,
+				       &get_integer_arg, &queues) < 0) {
 			PMD_INIT_LOG(ERR, "error to parse %s",
 				     VIRTIO_USER_ARG_QUEUES_NUM);
 			goto end;
@@ -387,9 +394,8 @@ virtio_user_pmd_devinit(const char *name, const char *params)
 	}
 
 	if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_CQ_NUM) == 1) {
-		ret = rte_kvargs_process(kvlist, VIRTIO_USER_ARG_CQ_NUM,
-					 &get_integer_arg, &cq);
-		if (ret < 0) {
+		if (rte_kvargs_process(kvlist, VIRTIO_USER_ARG_CQ_NUM,
+				       &get_integer_arg, &cq) < 0) {
 			PMD_INIT_LOG(ERR, "error to parse %s",
 				     VIRTIO_USER_ARG_CQ_NUM);
 			goto end;
@@ -411,12 +417,16 @@ virtio_user_pmd_devinit(const char *name, const char *params)
 
 	hw = eth_dev->data->dev_private;
 	if (virtio_user_dev_init(hw->virtio_user_dev, path, queues, cq,
-				 queue_size, mac_addr) < 0)
+				 queue_size, mac_addr) < 0) {
+		PMD_INIT_LOG(ERR, "virtio_user_dev_init fails");
+		virtio_user_eth_dev_free(eth_dev);
 		goto end;
+	}
 
 	/* previously called by rte_eal_pci_probe() for physical dev */
 	if (eth_virtio_dev_init(eth_dev) < 0) {
 		PMD_INIT_LOG(ERR, "eth_virtio_dev_init fails");
+		virtio_user_eth_dev_free(eth_dev);
 		goto end;
 	}
 	ret = 0;
-- 
2.7.4