[dpdk-dev] [PATCH v2] net/liquidio fixes unable to update linfo var

[Ferruh Yigit]

On 5/22/2018 10:07 PM, Ferruh Yigit wrote:
> On 5/22/2018 3:33 PM, chuhong yao wrote:
>> When I was using VPP +dpdk-18.02+liqudio CN23xx,
>> I encountered such a bug.
>> When VPP called dpdk_device_start to initialize DPDK liqudio drive,
>> I found that initialization failed.
>> The reason for the failure is that VF MTU > PF MTU,
>> but PF MTU has been modified to 9600 (> VF MTU).
>> Finally, I am location that DPDK liqudio drive
>> cannot get the correct PF driver to liqudio network card.
>> It is due to the fact that when VPP calls dpdk_device_start to
>> initialize DPDK liqudio drive,this time,
>> lio_dev->linfo.Link var already exists in the old value, not empty.
>> Cause lio_dev->linfo.Link. Link_status64 != 0
>> statement is set up,
>> and the link info is stopped directly to liqudio card,
>> resulting in no get accurate pf mtu.
>> I did a test model to reproduce the bug,
>> which is to add rte_eth_dev_set_mtu(portid, vf_mtu)
>> to the rte_eth_dev_start function when using
>> dpdk-18.02+liqudio CN23xx+l2fwd.
>> You need to make sure that 1500 < vf_mtu < pf_mtu will be available.
>> At this time, you will have
>> net_liovf[04:00.3]ERROR: lio_dev_mtu_set()
>> VF MTU should be >= 68 and <= 1500. Such a mistake.
>>
>> Signed-off-by: chuhong yao <ych at panath.cn>
> 
> Will use commit log suggested by maintainer [1]. Thanks Shijith!
> 
> 
> [1]
>     net/liquidio: fix link state fetching during device start
> 
>     Clear link state information during device start for fetching new state
>     before function completion.
> 
>     Fixes: 605164c8e79d ("net/liquidio: add API to validate VF MTU")
>     Cc: stable at dpdk.org
> 
>     Signed-off-by: Chuhong Yao <ych at panath.cn>
>     Acked-by: Shijith Thotton <shijith.thotton at caviumnetworks.com>

Applied to dpdk-next-net/master, thanks.