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net/virtio: fix interrupt unregistering for listening socket

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virtio_user_dev_server_reconnect() is typically called from the
interrupt context while checking the link state:

  vhost_user_update_link_state()
  --> virtio_user_dev_server_reconnect()

Under this conditions callback unregistering always fails.  This means
that listenfd is never unregistered and continue to trigger interrupts.
For example, if second client will try to connect to the same socket,
the server will receive interrupts infinitely because it will not
accept them while listen fd is readable and generates epoll events.

Fix that by moving reconfiguration of interrupts out of the
interrupt context to alarm handler.

'virtio_user_dev_delayed_handler' renamed to
'virtio_user_dev_delayed_disconnect_handler' to better reflect its
purpose.

Additionally improved error logging around interrupt management.

Fixes: bd8f50a45d0f ("net/virtio-user: support server mode")
Cc: stable@dpdk.org

Signed-off-by: Ilya Maximets <i.maximets@ovn.org>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
This commit is contained in:
Ilya Maximets 2021-03-17 21:25:27 +01:00 committed by Chenbo Xia
parent 968bbc7e2e
commit 23abee9dea
3 changed files with 57 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/net/virtio/virtio_user/vhost_user.c
View File

@ -957,7 +957,9 @@ vhost_user_update_link_state(struct virtio_user_dev *dev)
* of interrupt handling, callback cannot be
* unregistered here, set an alarm to do it.
*/
rte_eal_alarm_set(1, virtio_user_dev_delayed_handler, (void *)dev);
rte_eal_alarm_set(1,
virtio_user_dev_delayed_disconnect_handler,
(void *)dev);
} else {
dev->net_status |= VIRTIO_NET_S_LINK_UP;
}

70
drivers/net/virtio/virtio_user/virtio_user_dev.c
View File

@ -13,6 +13,7 @@
#include <sys/types.h>
#include <sys/stat.h>
#include <rte_alarm.h>
#include <rte_string_fns.h>
#include <rte_eal_memconfig.h>
@ -885,7 +886,7 @@ virtio_user_dev_reset_queues_packed(struct rte_eth_dev *eth_dev)
}
void
virtio_user_dev_delayed_handler(void *param)
virtio_user_dev_delayed_disconnect_handler(void *param)
{
struct virtio_user_dev *dev = param;
struct rte_eth_dev *eth_dev = &rte_eth_devices[dev->hw.port_id];
@ -894,14 +895,27 @@ virtio_user_dev_delayed_handler(void *param)
PMD_DRV_LOG(ERR, "interrupt disable failed");
return;
}
rte_intr_callback_unregister(eth_dev->intr_handle,
virtio_interrupt_handler, eth_dev);
PMD_DRV_LOG(DEBUG, "Unregistering intr fd: %d",
eth_dev->intr_handle->fd);
if (rte_intr_callback_unregister(eth_dev->intr_handle,
virtio_interrupt_handler,
eth_dev) != 1)
PMD_DRV_LOG(ERR, "interrupt unregister failed");
if (dev->is_server) {
if (dev->ops->server_disconnect)
dev->ops->server_disconnect(dev);
eth_dev->intr_handle->fd = dev->ops->get_intr_fd(dev);
rte_intr_callback_register(eth_dev->intr_handle,
virtio_interrupt_handler, eth_dev);
PMD_DRV_LOG(DEBUG, "Registering intr fd: %d",
eth_dev->intr_handle->fd);
if (rte_intr_callback_register(eth_dev->intr_handle,
virtio_interrupt_handler,
eth_dev))
PMD_DRV_LOG(ERR, "interrupt register failed");
if (rte_intr_enable(eth_dev->intr_handle) < 0) {
PMD_DRV_LOG(ERR, "interrupt enable failed");
return;
@ -909,6 +923,32 @@ virtio_user_dev_delayed_handler(void *param)
}
}
static void
virtio_user_dev_delayed_intr_reconfig_handler(void *param)
{
struct virtio_user_dev *dev = param;
struct rte_eth_dev *eth_dev = &rte_eth_devices[dev->hw.port_id];
PMD_DRV_LOG(DEBUG, "Unregistering intr fd: %d",
eth_dev->intr_handle->fd);
if (rte_intr_callback_unregister(eth_dev->intr_handle,
virtio_interrupt_handler,
eth_dev) != 1)
PMD_DRV_LOG(ERR, "interrupt unregister failed");
eth_dev->intr_handle->fd = dev->ops->get_intr_fd(dev);
PMD_DRV_LOG(DEBUG, "Registering intr fd: %d", eth_dev->intr_handle->fd);
if (rte_intr_callback_register(eth_dev->intr_handle,
virtio_interrupt_handler, eth_dev))
PMD_DRV_LOG(ERR, "interrupt register failed");
if (rte_intr_enable(eth_dev->intr_handle) < 0)
PMD_DRV_LOG(ERR, "interrupt enable failed");
}
int
virtio_user_dev_server_reconnect(struct virtio_user_dev *dev)
{
@ -974,18 +1014,14 @@ virtio_user_dev_server_reconnect(struct virtio_user_dev *dev)
PMD_DRV_LOG(ERR, "interrupt disable failed");
return -1;
}
rte_intr_callback_unregister(eth_dev->intr_handle,
virtio_interrupt_handler,
eth_dev);
eth_dev->intr_handle->fd = dev->ops->get_intr_fd(dev);
rte_intr_callback_register(eth_dev->intr_handle,
virtio_interrupt_handler, eth_dev);
if (rte_intr_enable(eth_dev->intr_handle) < 0) {
PMD_DRV_LOG(ERR, "interrupt enable failed");
return -1;
}
/*
* This function can be called from the interrupt handler, so
* we can't unregister interrupt handler here. Setting
* alarm to do that later.
*/
rte_eal_alarm_set(1,
virtio_user_dev_delayed_intr_reconfig_handler,
(void *)dev);
}
PMD_INIT_LOG(NOTICE, "server mode virtio-user reconnection succeeds!");
return 0;

2
drivers/net/virtio/virtio_user/virtio_user_dev.h
View File

@ -77,7 +77,7 @@ uint8_t virtio_user_handle_mq(struct virtio_user_dev *dev, uint16_t q_pairs);
int virtio_user_dev_set_status(struct virtio_user_dev *dev, uint8_t status);
int virtio_user_dev_update_status(struct virtio_user_dev *dev);
int virtio_user_dev_update_link_state(struct virtio_user_dev *dev);
void virtio_user_dev_delayed_handler(void *param);
void virtio_user_dev_delayed_disconnect_handler(void *param);
int virtio_user_dev_server_reconnect(struct virtio_user_dev *dev);
extern const char * const virtio_user_backend_strings[];
#endif