[dpdk-stable] [PATCH v1] net/tap: fix keep-alive queue not detached

[Thomas Monjalon]

25/05/2018 01:10, Ophir Munk:
> The TAP keep-alive queue was created in order to keep the TAP device
> in Linux even in case all of its Rx/Tx queues are released (in Linux
> terminology: even in case all of the TAP device file descriptors are
> closed), however, the keep-alive queue itself is attached to the TAP
> device like all other Rx/Tx queues and therefore the kernel will
> enqueue to it some Rx packets based on the kernel RSS distribution
> rules. Those packets are unknown to the application and will remain
> lost in the keep-alive queue.
> All queues are attached by default to the TAP device after they are
> created though TUNSETIFF ioctl call.
> The fix is to detach the keep-alive queue after its creation through
> TUNSETQUEUE ioctl call.
> 
> Fixes: 3101191c63ab ("net/tap: fix device removal when no queue exist")
> Cc: stable at dpdk.org
> 
> Signed-off-by: Ophir Munk <ophirmu at mellanox.com>
> ---
>  drivers/net/tap/rte_eth_tap.c | 33 +++++++++++++++++++++++++++------
>  1 file changed, 27 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/net/tap/rte_eth_tap.c b/drivers/net/tap/rte_eth_tap.c
> index 310c7d8..c3af608 100644
> --- a/drivers/net/tap/rte_eth_tap.c
> +++ b/drivers/net/tap/rte_eth_tap.c
> @@ -95,13 +95,20 @@ enum ioctl_mode {
>  
>  static int tap_intr_handle_set(struct rte_eth_dev *dev, int set);
>  
> -/* Tun/Tap allocation routine
> +/**
> + * Tun/Tap allocation routine
> + *
> + * @param[in] pmd
> + *   Pointer to private structure.
> + *
> + * @param[in] is_keepalive
> + *   Keepliave flag

Typo: Keepliave -> Keepalive
Ferruh, please can you fix it?
Or just remove all the doxygen comments?

Note: this fix is critical. Without it, some flows are lost.