[dpdk-stable] patch 'net/vhost: fix crash when creating vdev dynamically' has been queued to LTS release 17.11.2

[Yuanhan Liu]

Hi,

FYI, your patch has been queued to LTS release 17.11.2

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 04/29/18. So please
shout if anyone has objections.

Thanks.

	--yliu

---
>From f225e0f0b08de54ed5dd1fab6e4e410dd72a771f Mon Sep 17 00:00:00 2001
From: Junjie Chen <junjie.j.chen at intel.com>
Date: Fri, 30 Mar 2018 14:58:31 +0800
Subject: [PATCH] net/vhost: fix crash when creating vdev dynamically

[ upstream commit 30a701a53737a0b6f7953412cc3b3d36c1d49122 ]

When creating vdev dynamically, vhost pmd driver starts directly without
checking TX/RX queues are ready or not, and thus causes segmentation fault
when vhost library accesses queues. This patch adds a flag to check whether
queues are setup or not, and adds queues setup into dev_start function to
allow user to start them after setting up.

Fixes: aed0b12930b3 ("net/vhost: fix socket file deleted on stop")

Signed-off-by: Junjie Chen <junjie.j.chen at intel.com>
Tested-by: Zhiyong Yang <zhiyong.yang at intel.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin at redhat.com>
---
 drivers/net/vhost/rte_eth_vhost.c | 69 ++++++++++++++++++++++++++-------------
 1 file changed, 46 insertions(+), 23 deletions(-)

diff --git a/drivers/net/vhost/rte_eth_vhost.c b/drivers/net/vhost/rte_eth_vhost.c
index 2536ee4a2..2299ce877 100644
--- a/drivers/net/vhost/rte_eth_vhost.c
+++ b/drivers/net/vhost/rte_eth_vhost.c
@@ -117,6 +117,7 @@ struct pmd_internal {
 	char *dev_name;
 	char *iface_name;
 	uint16_t max_queues;
+	uint16_t vid;
 	rte_atomic32_t started;
 };
 
@@ -527,8 +528,10 @@ update_queuing_status(struct rte_eth_dev *dev)
 	unsigned int i;
 	int allow_queuing = 1;
 
-	if (rte_atomic32_read(&internal->started) == 0 ||
-	    rte_atomic32_read(&internal->dev_attached) == 0)
+	if (rte_atomic32_read(&internal->dev_attached) == 0)
+		return;
+
+	if (rte_atomic32_read(&internal->started) == 0)
 		allow_queuing = 0;
 
 	/* Wait until rx/tx_pkt_burst stops accessing vhost device */
@@ -551,13 +554,36 @@ update_queuing_status(struct rte_eth_dev *dev)
 	}
 }
 
+static void
+queue_setup(struct rte_eth_dev *eth_dev, struct pmd_internal *internal)
+{
+	struct vhost_queue *vq;
+	int i;
+
+	for (i = 0; i < eth_dev->data->nb_rx_queues; i++) {
+		vq = eth_dev->data->rx_queues[i];
+		if (!vq)
+			continue;
+		vq->vid = internal->vid;
+		vq->internal = internal;
+		vq->port = eth_dev->data->port_id;
+	}
+	for (i = 0; i < eth_dev->data->nb_tx_queues; i++) {
+		vq = eth_dev->data->tx_queues[i];
+		if (!vq)
+			continue;
+		vq->vid = internal->vid;
+		vq->internal = internal;
+		vq->port = eth_dev->data->port_id;
+	}
+}
+
 static int
 new_device(int vid)
 {
 	struct rte_eth_dev *eth_dev;
 	struct internal_list *list;
 	struct pmd_internal *internal;
-	struct vhost_queue *vq;
 	unsigned i;
 	char ifname[PATH_MAX];
 #ifdef RTE_LIBRTE_VHOST_NUMA
@@ -580,21 +606,13 @@ new_device(int vid)
 		eth_dev->data->numa_node = newnode;
 #endif
 
-	for (i = 0; i < eth_dev->data->nb_rx_queues; i++) {
-		vq = eth_dev->data->rx_queues[i];
-		if (vq == NULL)
-			continue;
-		vq->vid = vid;
-		vq->internal = internal;
-		vq->port = eth_dev->data->port_id;
-	}
-	for (i = 0; i < eth_dev->data->nb_tx_queues; i++) {
-		vq = eth_dev->data->tx_queues[i];
-		if (vq == NULL)
-			continue;
-		vq->vid = vid;
-		vq->internal = internal;
-		vq->port = eth_dev->data->port_id;
+	internal->vid = vid;
+	if (eth_dev->data->rx_queues && eth_dev->data->tx_queues) {
+		queue_setup(eth_dev, internal);
+		rte_atomic32_set(&internal->dev_attached, 1);
+	} else {
+		RTE_LOG(INFO, PMD, "RX/TX queues have not setup yet\n");
+		rte_atomic32_set(&internal->dev_attached, 0);
 	}
 
 	for (i = 0; i < rte_vhost_get_vring_num(vid); i++)
@@ -604,7 +622,6 @@ new_device(int vid)
 
 	eth_dev->data->dev_link.link_status = ETH_LINK_UP;
 
-	rte_atomic32_set(&internal->dev_attached, 1);
 	update_queuing_status(eth_dev);
 
 	RTE_LOG(INFO, PMD, "New connection established\n");
@@ -635,8 +652,9 @@ destroy_device(int vid)
 	eth_dev = list->eth_dev;
 	internal = eth_dev->data->dev_private;
 
-	rte_atomic32_set(&internal->dev_attached, 0);
+	rte_atomic32_set(&internal->started, 0);
 	update_queuing_status(eth_dev);
+	rte_atomic32_set(&internal->dev_attached, 0);
 
 	eth_dev->data->dev_link.link_status = ETH_LINK_DOWN;
 
@@ -773,12 +791,17 @@ rte_eth_vhost_get_vid_from_port_id(uint16_t port_id)
 }
 
 static int
-eth_dev_start(struct rte_eth_dev *dev)
+eth_dev_start(struct rte_eth_dev *eth_dev)
 {
-	struct pmd_internal *internal = dev->data->dev_private;
+	struct pmd_internal *internal = eth_dev->data->dev_private;
+
+	if (unlikely(rte_atomic32_read(&internal->dev_attached) == 0)) {
+		queue_setup(eth_dev, internal);
+		rte_atomic32_set(&internal->dev_attached, 1);
+	}
 
 	rte_atomic32_set(&internal->started, 1);
-	update_queuing_status(dev);
+	update_queuing_status(eth_dev);
 
 	return 0;
 }
-- 
2.11.0