netdev - Re: [PATCH net-next 2/6] net: dcb: add new common function for set/del of app/rewr entries

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Date:   Mon, 16 Jan 2023 13:00:10 +0000
From:   <Daniel.Machon@...rochip.com>
To:     <petrm@...dia.com>
CC:     <netdev@...r.kernel.org>, <davem@...emloft.net>,
        <edumazet@...gle.com>, <kuba@...nel.org>, <pabeni@...hat.com>,
        <Lars.Povlsen@...rochip.com>, <Steen.Hegelund@...rochip.com>,
        <UNGLinuxDriver@...rochip.com>, <joe@...ches.com>,
        <error27@...il.com>, <Horatiu.Vultur@...rochip.com>,
        <Julia.Lawall@...ia.fr>, <vladimir.oltean@....com>,
        <maxime.chevallier@...tlin.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next 2/6] net: dcb: add new common function for
 set/del of app/rewr entries

> > Signed-off-by: Daniel Machon <daniel.machon@...rochip.com>
> > ---
> >  net/dcb/dcbnl.c | 104 +++++++++++++++++++++++-------------------------
> >  1 file changed, 49 insertions(+), 55 deletions(-)
> >
> > diff --git a/net/dcb/dcbnl.c b/net/dcb/dcbnl.c
> > index a76bdf6f0198..6d19564e19a8 100644
> > --- a/net/dcb/dcbnl.c
> > +++ b/net/dcb/dcbnl.c
> > @@ -1099,6 +1099,45 @@ static int dcbnl_getapptrust(struct net_device *netdev, struct sk_buff *skb)
> >       return err;
> >  }
> >
> > +/* Set or delete APP table or rewrite table entries. The APP struct is validated
> > + * and the appropriate callback function is called.
> > + */
> > +static int dcbnl_apprewr_setdel(struct nlattr *attr, struct net_device *netdev,
> > +                             int (*setdel)(struct net_device *dev,
> > +                                           struct dcb_app *app),
> > +                             int (*ops_setdel)(struct net_device *dev,
> > +                                               struct dcb_app *app))
> 
> The name makes it look like it's rewrite-specific. Maybe make it
> _app_table_? Given both DCB app and DCB rewrite use app table as the
> database... Dunno. Not a big deal.

Yeah, the other shared funcs are called _app_* too, so lets stick with
that naming. Agreed.

> >  /* Handle IEEE 802.1Qaz/802.1Qau/802.1Qbb GET commands. */
> >  static int dcbnl_ieee_fill(struct sk_buff *skb, struct net_device *netdev)
> >  {
> > @@ -1568,36 +1607,11 @@ static int dcbnl_ieee_set(struct net_device *netdev, struct nlmsghdr *nlh,
> >       }
> >
> >       if (ieee[DCB_ATTR_IEEE_APP_TABLE]) {
> > -             struct nlattr *attr;
> > -             int rem;
> > -
> > -             nla_for_each_nested(attr, ieee[DCB_ATTR_IEEE_APP_TABLE], rem) {
> > -                     enum ieee_attrs_app type = nla_type(attr);
> > -                     struct dcb_app *app_data;
> > -
> > -                     if (!dcbnl_app_attr_type_validate(type))
> > -                             continue;
> > -
> > -                     if (nla_len(attr) < sizeof(struct dcb_app)) {
> > -                             err = -ERANGE;
> > -                             goto err;
> > -                     }
> > -
> > -                     app_data = nla_data(attr);
> > -
> > -                     if (!dcbnl_app_selector_validate(type,
> > -                                                      app_data->selector)) {
> > -                             err = -EINVAL;
> > -                             goto err;
> > -                     }
> > -
> > -                     if (ops->ieee_setapp)
> > -                             err = ops->ieee_setapp(netdev, app_data);
> > -                     else
> > -                             err = dcb_ieee_setapp(netdev, app_data);
> > -                     if (err)
> > -                             goto err;
> > -             }
> > +             err = dcbnl_apprewr_setdel(ieee[DCB_ATTR_IEEE_APP_TABLE],
> > +                                        netdev, dcb_ieee_setapp,
> > +                                        ops->ieee_setapp);
> 
> This could pre-resolve the callback to use and pass one pointer:
> 
>                 err = dcbnl_apprewr_setdel(ieee[DCB_ATTR_IEEE_APP_TABLE], netdev,
>                                            ops->ieee_setapp ?: dcb_ieee_setapp);

Agreed. 

Will make the suggested changes in v2 - thank you Petr.

/Daniel