[dpdk-dev] [Suspected-Phishing][PATCH] net/vhost: fix redundant queue state event
Noa Ezra
noae at mellanox.com
Tue Jun 25 09:04:26 CEST 2019
Hi,
What do you think about this patch?
Thanks,
Noa.
> -----Original Message-----
> From: Noa Ezra [mailto:noae at mellanox.com]
> Sent: Wednesday, June 19, 2019 9:16 AM
> To: maxime.coquelin at redhat.com
> Cc: Matan Azrad <matan at mellanox.com>; dev at dpdk.org; Noa Ezra
> <noae at mellanox.com>; stable at dpdk.org
> Subject: [Suspected-Phishing][PATCH] net/vhost: fix redundant queue state
> event
>
> In some situations, when a virtual machine is starting, vring_state_changed
> can be called while there was no change in the queue state. This fix makes
> sure that there was really a change in the queue state before calling the
> callback for EVENT_QUEUE_STATE.
>
> Fixes: ee584e9710b9 ("vhost: add driver on top of the library")
> Cc: stable at dpdk.org
> Reviewed-by: Matan Azrad <matan at mellanox.com>
> ---
> drivers/net/vhost/rte_eth_vhost.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/drivers/net/vhost/rte_eth_vhost.c
> b/drivers/net/vhost/rte_eth_vhost.c
> index cad1e5c..fbe7a37 100644
> --- a/drivers/net/vhost/rte_eth_vhost.c
> +++ b/drivers/net/vhost/rte_eth_vhost.c
> @@ -855,6 +855,10 @@ struct vhost_xstats_name_off {
> /* won't be NULL */
> state = vring_states[eth_dev->data->port_id];
> rte_spinlock_lock(&state->lock);
> + if (state->cur[vring] == enable) {
> + rte_spinlock_unlock(&state->lock);
> + return 0;
> + }
>
> state->cur[vring] = enable;
> state->max_vring = RTE_MAX(vring, state->max_vring);
> --
> 1.8.3.1
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