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-boun...@dpdk.org> On Behalf Of Itsuro Oda
> Sent: 2020年2月6日 9:40
> To: dev@dpdk.org; maxime.coque...@redhat.com; Bie, Tiwei
> <tiwei....@intel.com>; Wang, Zhihong <zhihong.w...@intel.com>; Burakov,
> Anatoly <anatoly.bura...@intel.com>
> Cc: sta...@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: sta...@dpdk.org
>
> Signed-off-by: Itsuro Oda <o...@valinux.co.jp>
> Reviewed-by: Maxime Coquelin <maxime.coque...@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
