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

[Ferruh Yigit <ferruh.yigit@intel.com>]

On 5/25/2018 9:29 AM, Thomas Monjalon wrote:
> 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@dpdk.org
>>
>> Signed-off-by: Ophir Munk <ophirmu@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?

I will fix the typo while merging.

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