[dpdk-dev] [PATCH v5] net/i40e: extend VF reset waiting time

[Zhang, Qi Z]

> -----Original Message-----
> From: dev <dev-bounces at dpdk.org> On Behalf Of Wenjun Wu
> Sent: Thursday, April 29, 2021 4:27 PM
> To: dev at dpdk.org; Xing, Beilei <beilei.xing at intel.com>
> Cc: Wu, Wenjun1 <wenjun1.wu at intel.com>
> Subject: [dpdk-dev] [PATCH v5] net/i40e: extend VF reset waiting time
> 
> When starting VF, VF will issue reset command to PF, wait a fixed amount of
> time, and assume VF reset is done on PF side. However, compared with kernel
> PF, DPDK PF needs more time to setup. If we run DPDK PF to support DPDK VF,
> the original delay will not be enough. When we first start VF after PF is
> launched, the execution time of the statement info.msg_buf =
> rte_zmalloc("msg_buffer", info.buf_len, 0); in the function
> i40e_dev_handle_aq_msg is more than 200ms. It may cause VF start error.
> 
> Since iavf can hardly triggle this issue and i40evf will be replaced by iavf in
> future DPDK versions, this patch provide a workaround.
> We extend VF reset waiting time from 200ms to 500ms so that VF can start
> normally when using DPDK PF and DPDK VF in most cases.
> 
> Signed-off-by: Wenjun Wu <wenjun1.wu at intel.com>

Acked-by: Qi Zhang <qi.z.zhang at intel.com>

Applied to dpdk-next-net-intel.

Thanks
Qi