Re: [dpdk-dev] [PATCH v3 2/4] net/vhost: delay vhost driver setup

["Wang, Yinan" <yinan.wang@intel.com>]

Hi Itsuro/Maxime,

Below patch (commit id:3d01b759d2679c216725689eabe44147d1737326)blocked vhost/virtio basic test: If re-config vhost port，testpmd will launch failed.

Reproduce steps:

./x86_64-native-linuxapp-gcc/app/testpmd -l 2-4 -n 4 --socket-mem 1024,1024  --legacy-mem --file-prefix=vhost --vdev 'net_vhost0,iface=vhost-net,queues=1,client=0' --no-pci -- -i --txd=1024 --rxd=1024
    testpmd>set fwd csum
    testpmd>stop
    testpmd>port stop 0
    testpmd>csum set tcp sw 0
    testpmd>port start 0

VHOST_CONFIG: vhost-user server: socket created, fd: 26
VHOST_CONFIG: failed to bind to vhost-net: Address already in use; remove it and try again
Failed to start driver for vhost-net
Port0 dev_configure = -1
Fail to configure port 0

BR,
Yinan
> -----Original Message-----
> From: dev <dev-bounces@dpdk.org> On Behalf Of Itsuro Oda
> Sent: 2020年2月6日 9:40
> To: dev@dpdk.org; maxime.coquelin@redhat.com; Bie, Tiwei
> <tiwei.bie@intel.com>; Wang, Zhihong <zhihong.wang@intel.com>; Burakov,
> Anatoly <anatoly.burakov@intel.com>
> Cc: stable@dpdk.org
> Subject: [dpdk-dev] [PATCH v3 2/4] net/vhost: delay vhost driver setup
> 
> Vhost driver setup is delayed at eth_dev configuration in order to be able to set
> it from a secondary process.
> 
> Fixes: 4852aa8f6e21 (drivers/net: enable hotplug on secondary process)
> Cc: stable@dpdk.org
> 
> Signed-off-by: Itsuro Oda <oda@valinux.co.jp>
> Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
> ---
>  drivers/net/vhost/rte_eth_vhost.c | 130 ++++++++++++++++++------------
>  1 file changed, 78 insertions(+), 52 deletions(-)
> 
> diff --git a/drivers/net/vhost/rte_eth_vhost.c
> b/drivers/net/vhost/rte_eth_vhost.c
> index cea2ead2d..d7bba5c6e 100644
> --- a/drivers/net/vhost/rte_eth_vhost.c
> +++ b/drivers/net/vhost/rte_eth_vhost.c
> @@ -97,6 +97,8 @@ struct pmd_internal {
>  	rte_atomic32_t dev_attached;
>  	char *dev_name;
>  	char *iface_name;
> +	uint64_t flags;
> +	uint64_t disable_flags;
>  	uint16_t max_queues;
>  	int vid;
>  	rte_atomic32_t started;
> @@ -491,17 +493,6 @@ eth_vhost_tx(void *q, struct rte_mbuf **bufs,
> uint16_t nb_bufs)
>  	return nb_tx;
>  }
> 
> -static int
> -eth_dev_configure(struct rte_eth_dev *dev __rte_unused) -{
> -	struct pmd_internal *internal = dev->data->dev_private;
> -	const struct rte_eth_rxmode *rxmode = &dev->data->dev_conf.rxmode;
> -
> -	internal->vlan_strip = !!(rxmode->offloads &
> DEV_RX_OFFLOAD_VLAN_STRIP);
> -
> -	return 0;
> -}
> -
>  static inline struct internal_list *
>  find_internal_resource(char *ifname)
>  {
> @@ -877,6 +868,62 @@ static struct vhost_device_ops vhost_ops = {
>  	.vring_state_changed = vring_state_changed,  };
> 
> +static int
> +vhost_driver_setup(struct rte_eth_dev *eth_dev) {
> +	struct pmd_internal *internal = eth_dev->data->dev_private;
> +	struct internal_list *list = NULL;
> +	struct rte_vhost_vring_state *vring_state = NULL;
> +	unsigned int numa_node = eth_dev->device->numa_node;
> +	const char *name = eth_dev->device->name;
> +
> +	list = rte_zmalloc_socket(name, sizeof(*list), 0, numa_node);
> +	if (list == NULL)
> +		goto error;
> +
> +	vring_state = rte_zmalloc_socket(name, sizeof(*vring_state),
> +					 0, numa_node);
> +	if (vring_state == NULL)
> +		goto error;
> +
> +	list->eth_dev = eth_dev;
> +	pthread_mutex_lock(&internal_list_lock);
> +	TAILQ_INSERT_TAIL(&internal_list, list, next);
> +	pthread_mutex_unlock(&internal_list_lock);
> +
> +	rte_spinlock_init(&vring_state->lock);
> +	vring_states[eth_dev->data->port_id] = vring_state;
> +
> +	if (rte_vhost_driver_register(internal->iface_name, internal->flags))
> +		goto error;
> +
> +	if (internal->disable_flags) {
> +		if (rte_vhost_driver_disable_features(internal->iface_name,
> +						      internal->disable_flags))
> +			goto error;
> +	}
> +
> +	if (rte_vhost_driver_callback_register(internal->iface_name,
> +					       &vhost_ops) < 0) {
> +		VHOST_LOG(ERR, "Can't register callbacks\n");
> +		goto error;
> +	}
> +
> +	if (rte_vhost_driver_start(internal->iface_name) < 0) {
> +		VHOST_LOG(ERR, "Failed to start driver for %s\n",
> +			  internal->iface_name);
> +		goto error;
> +	}
> +
> +	return 0;
> +
> +error:
> +	rte_free(vring_state);
> +	rte_free(list);
> +
> +	return -1;
> +}
> +
>  int
>  rte_eth_vhost_get_queue_event(uint16_t port_id,
>  		struct rte_eth_vhost_queue_event *event) @@ -943,6 +990,24 @@
> rte_eth_vhost_get_vid_from_port_id(uint16_t port_id)
>  	return vid;
>  }
> 
> +static int
> +eth_dev_configure(struct rte_eth_dev *dev) {
> +	struct pmd_internal *internal = dev->data->dev_private;
> +	const struct rte_eth_rxmode *rxmode = &dev->data->dev_conf.rxmode;
> +
> +	/* NOTE: the same process has to operate a vhost interface
> +	 * from beginning to end (from eth_dev configure to eth_dev close).
> +	 * It is user's responsibility at the moment.
> +	 */
> +	if (vhost_driver_setup(dev) < 0)
> +		return -1;
> +
> +	internal->vlan_strip = !!(rxmode->offloads &
> +DEV_RX_OFFLOAD_VLAN_STRIP);
> +
> +	return 0;
> +}
> +
>  static int
>  eth_dev_start(struct rte_eth_dev *eth_dev)  { @@ -1219,16 +1284,10 @@
> eth_dev_vhost_create(struct rte_vdev_device *dev, char *iface_name,
>  	struct pmd_internal *internal = NULL;
>  	struct rte_eth_dev *eth_dev = NULL;
>  	struct rte_ether_addr *eth_addr = NULL;
> -	struct rte_vhost_vring_state *vring_state = NULL;
> -	struct internal_list *list = NULL;
> 
>  	VHOST_LOG(INFO, "Creating VHOST-USER backend on numa
> socket %u\n",
>  		numa_node);
> 
> -	list = rte_zmalloc_socket(name, sizeof(*list), 0, numa_node);
> -	if (list == NULL)
> -		goto error;
> -
>  	/* reserve an ethdev entry */
>  	eth_dev = rte_eth_vdev_allocate(dev, sizeof(*internal));
>  	if (eth_dev == NULL)
> @@ -1242,11 +1301,6 @@ eth_dev_vhost_create(struct rte_vdev_device *dev,
> char *iface_name,
>  	*eth_addr = base_eth_addr;
>  	eth_addr->addr_bytes[5] = eth_dev->data->port_id;
> 
> -	vring_state = rte_zmalloc_socket(name,
> -			sizeof(*vring_state), 0, numa_node);
> -	if (vring_state == NULL)
> -		goto error;
> -
>  	/* now put it all together
>  	 * - store queue data in internal,
>  	 * - point eth_dev_data to internals
> @@ -1262,18 +1316,12 @@ eth_dev_vhost_create(struct rte_vdev_device
> *dev, char *iface_name,
>  		goto error;
>  	strcpy(internal->iface_name, iface_name);
> 
> -	list->eth_dev = eth_dev;
> -	pthread_mutex_lock(&internal_list_lock);
> -	TAILQ_INSERT_TAIL(&internal_list, list, next);
> -	pthread_mutex_unlock(&internal_list_lock);
> -
> -	rte_spinlock_init(&vring_state->lock);
> -	vring_states[eth_dev->data->port_id] = vring_state;
> -
>  	data->nb_rx_queues = queues;
>  	data->nb_tx_queues = queues;
>  	internal->max_queues = queues;
>  	internal->vid = -1;
> +	internal->flags = flags;
> +	internal->disable_flags = disable_flags;
>  	data->dev_link = pmd_link;
>  	data->dev_flags = RTE_ETH_DEV_INTR_LSC |
> RTE_ETH_DEV_CLOSE_REMOVE;
> 
> @@ -1283,26 +1331,6 @@ eth_dev_vhost_create(struct rte_vdev_device *dev,
> char *iface_name,
>  	eth_dev->rx_pkt_burst = eth_vhost_rx;
>  	eth_dev->tx_pkt_burst = eth_vhost_tx;
> 
> -	if (rte_vhost_driver_register(iface_name, flags))
> -		goto error;
> -
> -	if (disable_flags) {
> -		if (rte_vhost_driver_disable_features(iface_name,
> -					disable_flags))
> -			goto error;
> -	}
> -
> -	if (rte_vhost_driver_callback_register(iface_name, &vhost_ops) < 0) {
> -		VHOST_LOG(ERR, "Can't register callbacks\n");
> -		goto error;
> -	}
> -
> -	if (rte_vhost_driver_start(iface_name) < 0) {
> -		VHOST_LOG(ERR, "Failed to start driver for %s\n",
> -			iface_name);
> -		goto error;
> -	}
> -
>  	rte_eth_dev_probing_finish(eth_dev);
>  	return 0;
> 
> @@ -1311,9 +1339,7 @@ eth_dev_vhost_create(struct rte_vdev_device *dev,
> char *iface_name,
>  		rte_free(internal->iface_name);
>  		free(internal->dev_name);
>  	}
> -	rte_free(vring_state);
>  	rte_eth_dev_release_port(eth_dev);
> -	rte_free(list);
> 
>  	return -1;
>  }
> --
> 2.17.0