linux-kernel - Re: [PATCH net-next 2/2] bonding: combine netlink and console error messages

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Date:   Mon, 9 Aug 2021 09:03:53 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Jonathan Toppins <jtoppins@...hat.com>
Cc:     netdev@...r.kernel.org, Jay Vosburgh <j.vosburgh@...il.com>,
        Veaceslav Falico <vfalico@...il.com>,
        Andy Gospodarek <andy@...yhouse.net>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 2/2] bonding: combine netlink and console error
 messages

On Sun, Aug 08, 2021 at 09:42:46PM -0400, Jonathan Toppins wrote:
> On 8/8/21 6:16 AM, Leon Romanovsky wrote:
> > On Fri, Aug 06, 2021 at 11:30:55PM -0400, Jonathan Toppins wrote:
> > > There seems to be no reason to have different error messages between
> > > netlink and printk. It also cleans up the function slightly.
> > > 
> > > Signed-off-by: Jonathan Toppins <jtoppins@...hat.com>
> > > ---
> > >   drivers/net/bonding/bond_main.c | 45 ++++++++++++++++++---------------
> > >   1 file changed, 25 insertions(+), 20 deletions(-)
> > > 
> > > diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
> > > index 3ba5f4871162..46b95175690b 100644
> > > --- a/drivers/net/bonding/bond_main.c
> > > +++ b/drivers/net/bonding/bond_main.c
> > > @@ -1712,6 +1712,16 @@ void bond_lower_state_changed(struct slave *slave)
> > >   	netdev_lower_state_changed(slave->dev, &info);
> > >   }
> > > +#define BOND_NL_ERR(bond_dev, extack, errmsg) do {		\
> > > +	NL_SET_ERR_MSG(extack, errmsg);				\
> > > +	netdev_err(bond_dev, "Error: " errmsg "\n");		\
> > > +} while (0)
> > > +
> > > +#define SLAVE_NL_ERR(bond_dev, slave_dev, extack, errmsg) do {	\
> > > +	NL_SET_ERR_MSG(extack, errmsg);				\
> > > +	slave_err(bond_dev, slave_dev, "Error: " errmsg "\n");	\
> > > +} while (0)
> > 
> > I don't think that both extack messages and dmesg prints are needed.
> > 
> > They both will be caused by the same source, and both will be seen by
> > the caller, but duplicated.
> > 
> > IMHO, errors that came from the netlink, should be printed with NL_SET_ERR_MSG(),
> > other errors should use netdev_err/slave_err prints.
> > 
> 
> bond_enslave can be called from two places sysfs and netlink so reporting
> both a console message and netlink message makes sense to me. So I have to
> disagree in this case. I am simply making the two paths report the same
> error in the function so that when using sysfs the same information is
> reported. In the netlink case the information will be reported twice, once
> an an error response over netlink and once via printk.

There is no need to print any errors twice, just add "if (extack)" to you
macros, something like that:

+#define SLAVE_NL_ERR(bond_dev, slave_dev, extack, errmsg) do { 
*       if (extack) 						\
+       	NL_SET_ERR_MSG(extack, errmsg);                 \
+       else 							\
+       	slave_err(bond_dev, slave_dev, "Error: " errmsg "\n");  \
+} while (0)

Thanks

> 
> -Jon
>