netdev - Re: [patch 1/9] [PATCH] qeth: convert to hw

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Date:	Tue, 10 May 2011 16:09:36 +0200
From:	Frank Blaschka <blaschka@...ux.vnet.ibm.com>
To:	Michał Mirosław <mirqus@...il.com>
Cc:	davem@...emloft.net, netdev@...r.kernel.org,
	linux-s390@...r.kernel.org
Subject: Re: [patch 1/9] [PATCH] qeth: convert to hw_features part 2

On Tue, May 10, 2011 at 03:19:27PM +0200, Michał Mirosław wrote:
> > From: Frank Blaschka <frank.blaschka@...ibm.com>
> >
> > Set rx csum default to hw checksumming again.
> > Remove sysfs interface for rx csum (checksumming) and TSO (large_send).
> > With the new hw_features it does not work to keep the old sysfs
> > interface in parallel. Convert options.checksum_type to new hw_features.
> [...]
> > @@ -1482,32 +1476,28 @@ static int qeth_l3_start_ipa_checksum(st
> [...]
> > -       rc = qeth_l3_send_checksum_command(card);
> > -       if (!rc)
> > -               dev_info(&card->gdev->dev,
> > +                       card->dev->hw_features &= ~IPA_INBOUND_CHECKSUM;
> > +                       card->dev->features &= ~IPA_INBOUND_CHECKSUM;
> > +                       return 0;
> > +               }
> 
> Should be NETIF_F_RXCSUM probably.
>
Thx for reviewing the patch, yes should be NETIF_F_RXCSUM
 
> Don't modify hw_features. Limit currently available features in
> ndo_fix_features callback instead when checksumming is (temporarily)
> unavailable.
>
We have a recovery operation in our driver. What can we do in case this
recovery detects the checksumming is not available anymore (during runtime
of the device). ndo_fix_features callback does not come into play at this time.
How can we solve this?

> [...]
> >  static int qeth_l3_set_features(struct net_device *dev, u32 features)
> >  {
> > -       enum qeth_checksum_types csum_type;
> >        struct qeth_card *card = dev->ml_priv;
> >        u32 changed = dev->features ^ features;
> > +       int on;
> >
> >        if (!(changed & NETIF_F_RXCSUM))
> >                return 0;
> >
> >        if (features & NETIF_F_RXCSUM)
> > -               csum_type = HW_CHECKSUMMING;
> > +               on = 1;
> >        else
> > -               csum_type = SW_CHECKSUMMING;
> > +               on = 0;
> >
> >        dev->features = features ^ NETIF_F_RXCSUM;
> > -       return qeth_l3_set_rx_csum(card, csum_type);
> > +       return qeth_l3_set_rx_csum(card, on);
> >  }
> 
> Since you removed dev->features update from qeth_l3_set_rx_csum(), you
> should also modify this code to match. On exit from ndo_fix_features,
> dev->features should reflect what is currently set, even if part of
Do you mean qeth_l3_set_rx_csum should set dev->features dependent of
the result of the checksum hardware operation?
> the request failed.
> 
> >  static const struct ethtool_ops qeth_l3_ethtool_ops = {
> > @@ -3342,6 +3326,12 @@ static int qeth_l3_setup_netdev(struct q
> >                        if (!(card->info.unique_id & UNIQUE_ID_NOT_BY_CARD))
> >                                card->dev->dev_id = card->info.unique_id &
> >                                                         0xffff;
> > +                       if (!card->info.guestlan) {
> > +                               card->dev->hw_features = NETIF_F_SG |
> > +                                       NETIF_F_RXCSUM | NETIF_F_IP_CSUM |
> > +                                       NETIF_F_TSO;
> > +                               card->dev->features = NETIF_F_RXCSUM;
> > +                       }
> 
> All features except RXCSUM will be disabled by default. Is that the intent here?
Yes, it is.

> 
> Best Regards,
> Michał Mirosław
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