Subject: Re: [PATCH iwl-next v5 1/9] net: ethtool: mm: extract stmmac verification logic into common library

From: Furong Xu <[email-masked]>
Date: Fri, 21 Feb 2025 18:24:09 +0800

On Fri, 21 Feb 2025 11:56:51 +0200, Vladimir Oltean <[email-masked]> wrote:

> On Fri, Feb 21, 2025 at 05:42:49PM +0800, Furong Xu wrote:
> > > +void ethtool_mmsv_link_state_handle(struct ethtool_mmsv *mmsv, bool up)
> > > +{
> > > +	unsigned long flags;
> > > +
> > > +	ethtool_mmsv_stop(mmsv);
> > > +
> > > +	spin_lock_irqsave(&mmsv->lock, flags);
> > > +
> > > +	if (up && mmsv->pmac_enabled) {
> > > +		/* VERIFY process requires pMAC enabled when NIC comes up */
> > > +		ethtool_mmsv_configure_pmac(mmsv, true);
> > > +
> > > +		/* New link => maybe new partner => new verification process */
> > > +		ethtool_mmsv_apply(mmsv);
> > > +	} else {
> > > +		mmsv->status = ETHTOOL_MM_VERIFY_STATUS_INITIAL;  
> > 
> > Tested this patch on my side, everything works well, but the verify-status
> > is a little weird:
> > 
> > # kernel booted, check initial states:
> > ethtool --include-statistics --json --show-mm eth1
> > [ {
> >         "ifname": "eth1",
> >         "pmac-enabled": false,
> >         "tx-enabled": false,
> >         "tx-active": false,
> >         "tx-min-frag-size": 60,
> >         "rx-min-frag-size": 60,
> >         "verify-enabled": false,
> >         "verify-time": 128,
> >         "max-verify-time": 128,
> >         "verify-status": "INITIAL",
> >         "statistics": {
> >             "MACMergeFrameAssErrorCount": 0,
> >             "MACMergeFrameSmdErrorCount": 0,
> >             "MACMergeFrameAssOkCount": 0,
> >             "MACMergeFragCountRx": 0,
> >             "MACMergeFragCountTx": 0,
> >             "MACMergeHoldCount": 0
> >         }
> >     } ]
> > 
> > # Enable pMAC by: ethtool --set-mm eth1 pmac-enabled on
> > ethtool --include-statistics --json --show-mm eth1
> > [ {
> >         "ifname": "eth1",
> >         "pmac-enabled": true,
> >         "tx-enabled": false,
> >         "tx-active": false,
> >         "tx-min-frag-size": 60,
> >         "rx-min-frag-size": 60,
> >         "verify-enabled": false,
> >         "verify-time": 128,
> >         "max-verify-time": 128,
> >         "verify-status": "DISABLED",
> >         "statistics": {
> >             "MACMergeFrameAssErrorCount": 0,
> >             "MACMergeFrameSmdErrorCount": 0,
> >             "MACMergeFrameAssOkCount": 0,
> >             "MACMergeFragCountRx": 0,
> >             "MACMergeFragCountTx": 0,
> >             "MACMergeHoldCount": 0
> >         }
> >     } ]
> > 
> > # Disable pMAC by: ethtool --set-mm eth1 pmac-enabled off
> > ethtool --include-statistics --json --show-mm eth1
> > [ {
> >         "ifname": "eth1",
> >         "pmac-enabled": true,
> >         "tx-enabled": false,
> >         "tx-active": false,
> >         "tx-min-frag-size": 60,
> >         "rx-min-frag-size": 60,
> >         "verify-enabled": false,
> >         "verify-time": 128,
> >         "max-verify-time": 128,
> >         "verify-status": "DISABLED",
> >         "statistics": {
> >             "MACMergeFrameAssErrorCount": 0,
> >             "MACMergeFrameSmdErrorCount": 0,
> >             "MACMergeFrameAssOkCount": 0,
> >             "MACMergeFragCountRx": 0,
> >             "MACMergeFragCountTx": 0,
> >             "MACMergeHoldCount": 0
> >         }
> >     } ]
> > 
> > verify-status always normal on other cases.  
> 
> Thanks for testing and for reporting this inconsistency.
> 
> > @Vladimir, maybe we shouldn't update mmsv->status in ethtool_mmsv_link_state_handle()?
> > Or, update mmsv->status like below:
> > mmsv->status = mmsv->pmac_enabled ?
> > 		ETHTOOL_MM_VERIFY_STATUS_INITIAL :
> > 		ETHTOOL_MM_VERIFY_STATUS_DISABLED;  
> 
> You mean mmsv->status = mmsv->verify_enabled ? ETHTOOL_MM_VERIFY_STATUS_INITIAL :
>                         ~~~~~~~~~~~~~~~~~~~~   ETHTOOL_MM_VERIFY_STATUS_DISABLED?

Your fix is better when link is up/down, so I vote verify_enabled.