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To: Thomas Monjalon <thomas@monjalon.net>, Ophir Munk <ophirmu@mellanox.com>
Cc: stable@dpdk.org, dev@dpdk.org, Pascal Mazon <pascal.mazon@6wind.com>,
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From: Ferruh Yigit <ferruh.yigit@intel.com>
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Message-ID: <37741ba9-bca4-0913-0578-7ad759ba5bcb@intel.com>
Date: Fri, 25 May 2018 09:37:53 +0100
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Subject: Re: [dpdk-stable] [PATCH v1] net/tap: fix keep-alive queue not
detached
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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.
>
>