[dpdk-dev] [PATCH v2] net/ice: fix setting max frame size

[Min, JiaqiX]

Hi Xiaolong,

> -----Original Message-----
> From: Ye, Xiaolong
> Sent: Monday, October 28, 2019 4:46 PM
> To: Min, JiaqiX <jiaqix.min at intel.com>
> Cc: dev at dpdk.org; stable at dpdk.org
> Subject: Re: [dpdk-dev] [PATCH v2] net/ice: fix setting max frame size
> 
> On 10/28, Min JiaqiX wrote:
> >Max frame size is not set to HW, so packets above the MTU do not get
> >dropped by HW. The patch fixed the issue.
> >
> >Fixes: ae2bdd0219cb ("net/ice: support MTU setting")
> 
> We should set max frame size to HW in the beginning when the driver was
> introduced, so the fix commit should be 50370662b727 ("net/ice: support
> device and queue ops")
Modify commit message in patch v3.
> 
> Fix this while merging.
> 
> >Cc: stable at dpdk.org
> >
> >Signed-off-by: Min JiaqiX <jiaqix.min at intel.com>
> >---
> >v2:
> >* Changed commit message.
> >---
> > drivers/net/ice/ice_ethdev.c | 4 ++++
> > 1 file changed, 4 insertions(+)
> >
> >diff --git a/drivers/net/ice/ice_ethdev.c
> >b/drivers/net/ice/ice_ethdev.c index 022b58c01..403305cfb 100644
> >--- a/drivers/net/ice/ice_ethdev.c
> >+++ b/drivers/net/ice/ice_ethdev.c
> >@@ -2506,6 +2506,10 @@ ice_dev_start(struct rte_eth_dev *dev)
> >
> > 	pf->adapter_stopped = false;
> >
> >+	/* Set the max frame size */
> >+	ice_aq_set_mac_cfg(hw,
> >+		pf->dev_data->dev_conf.rxmode.max_rx_pkt_len, NULL);
> >+
> 
> Why set the max frame size to HW in start ops, not in init stage like in i40e?
> and what if max_rx_pkt_len hasn't been set?
> 
max_rx_pkt_len need to be set to HW when set mtu ,  init stage won't be called when open port again.

Appendix:
Steps for using Example/ethtool  to set mtu:
EthApp>stop 0
EthApp>mtu 0 200
EthApp>open 0

> 
> Thanks,
> Xiaolong
> 
> 
> > 	return 0;
> >
> > 	/* stop the started queues if failed to start all queues */
> >--
> >2.17.1
> >
> 
> Reviewed-by: Xiaolong Ye <xiaolong.ye at intel.com>
> 
> Applied to dpdk-next-net-intel. Thanks.