Re: [dpdk-dev] [v3] net/i40e: fix vlan packets drop

["Mattias Rönnblom" <mattias.ronnblom@ericsson.com>]

On 2019-11-09 04:01, Zhang, Qi Z wrote:
>
>> -----Original Message-----
>> From: Thomas Monjalon <thomas@monjalon.net>
>> Sent: Saturday, November 9, 2019 3:49 AM
>> To: Kevin Traynor <ktraynor@redhat.com>
>> Cc: Zhang, Xiao <xiao.zhang@intel.com>; dev@dpdk.org; Xing, Beilei
>> <beilei.xing@intel.com>; Zhang, Qi Z <qi.z.zhang@intel.com>; Stokes, Ian
>> <ian.stokes@intel.com>; stable@dpdk.org; Andrew Rybchenko
>> <arybchenko@solarflare.com>; Yigit, Ferruh <ferruh.yigit@intel.com>; Ye,
>> Xiaolong <xiaolong.ye@intel.com>
>> Subject: Re: [v3] net/i40e: fix vlan packets drop
>>
>> 08/11/2019 20:28, Kevin Traynor:
>>> Hi Xiao,
>>>
>>> On 29/10/2019 05:12, Xiao Zhang wrote:
>>>> VLAN packets with ip length bigger than 1496 will not be received by
>>>> i40e/i40evf due to wrong packets size checking. This patch fixes the
>>>> issue by correcting the maximum frame size during checking.
>>>>
>>>> Fixes: 43e5488c0ac6 ("net/i40e: support MTU configuration")
>>>> Cc: stable@dpdk.org
>>>>
>>>> Signed-off-by: Xiao Zhang <xiao.zhang@intel.com>
>>>> ---
>>>> v3
>>>> Checking more places using max packet len.
>>>> v2
>>>> Add fix for i40evf and correct the checking when using the max_pkt_len.
>>>> ---
>>>>   drivers/net/i40e/i40e_ethdev.c    |  2 +-
>>>>   drivers/net/i40e/i40e_ethdev_vf.c | 11 +++++++----
>>>>   drivers/net/i40e/i40e_fdir.c      |  2 +-
>>>>   drivers/net/i40e/i40e_rxtx.c      |  9 ++++++---
>>>>   lib/librte_ethdev/rte_ethdev.c    | 10 ++++++++--
>>>>   lib/librte_net/rte_ether.h        |  1 +
>>>>   6 files changed, 24 insertions(+), 11 deletions(-)
>>>>
>>>> --- a/lib/librte_ethdev/rte_ethdev.c
>>>> +++ b/lib/librte_ethdev/rte_ethdev.c
>>>> @@ -1257,11 +1257,17 @@ rte_eth_dev_configure(uint16_t port_id,
>> uint16_t nb_rx_q, uint16_t nb_tx_q,
>>>>   			goto rollback;
>>>>   		}
>>>>   	} else {
>>>> +		/**
>>>> +		 * The overhead from MTU to max frame size.
>>>> +		 * Considering VLAN and QinQ packet, the VLAN tag size
>>>> +		 * needs to be added to RTE_ETHER_MAX_LEN.
>>>> +		 */
>>>>   		if (dev_conf->rxmode.max_rx_pkt_len < RTE_ETHER_MIN_LEN
>> ||
>>>> -			dev_conf->rxmode.max_rx_pkt_len > RTE_ETHER_MAX_LEN)
>>>> +			dev_conf->rxmode.max_rx_pkt_len > RTE_ETHER_MAX_LEN
>>>> +				+ RTE_ETHER_VLAN_LEN * 2)
>>>>   			/* Use default value */
>>>>   			dev->data->dev_conf.rxmode.max_rx_pkt_len =
>>>> -							RTE_ETHER_MAX_LEN;
>>>> +				RTE_ETHER_MAX_LEN + RTE_ETHER_VLAN_LEN * 2;
>>> +cc ethdev maintainers
>>>
>>> This looks ok to me for i40e case, but I don't know if there is a
>>> consequence for other PMDs. It seems late to change this, so maybe you
>>> can live without this part for now.
>>>
>>> Even on the i40e parts, there can be some subtle bug and I requested
>>> i40e maintainers to review carefully but it has not happened, so for
>>> me it shouldn't be merged at present.
>> I would nack for another, simpler, reason:
>> No ethdev behaviour change should be submitted if title does not start with
>> "ethdev:" and if ethdev maintainers are not Cc'ed.
>>
>>
> Yes, the patch should be dropped even without the ethdev part change, the fix for i40e need more refine.
> Sorry for review this late.


 From what I can see, no fix for the bug this patch attempts to address 
has been merged yet. Correct?