[dpdk-dev] i40e: disabling flow control makes XL710 NIC discard all packets

[Zhang, Helin]

Hi Martin

Thank you very much for reporting the issue!
Could you help to add more detailed steps and other information?
We will try to reproduce what have seen in our lab, and then debug.

Regards,
Helin

> -----Original Message-----
> From: Martin Weiser [mailto:martin.weiser at allegro-packets.com]
> Sent: Wednesday, November 4, 2015 6:17 PM
> To: Zhang, Helin; dev at dpdk.org
> Subject: i40e: disabling flow control makes XL710 NIC discard all packets
> 
> Hi Helin,
> 
> I have been doing some tests with the current DPDK master to see if the issues
> we had with performance and statistics have improved.
> In our own applications we usually disable flow control using the following code:
> 
> struct rte_eth_fc_conf fc_conf = { .mode = RTE_FC_NONE }; int ret =
> rte_eth_dev_flow_ctrl_set(port_id, &fc_conf);
> 
> In DPDK 2.1 this did not cause any problems with XL710 NICs but with the current
> master the NIC will not receive any packets and they are all counted in ierrors and
> imissed.
> The return value of rte_eth_dev_flow_ctrl_set does not indicate an error so it
> seems like something is going wrong here.

> 
> Regards,
> Martin