netdev - Re: [PATCH net-next 1/3] bonding: update the primary slave when slave's name changed

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Message-ID: <20140114063847.GB7798@redhat.com>
Date:	Tue, 14 Jan 2014 07:38:47 +0100
From:	Veaceslav Falico <vfalico@...hat.com>
To:	Ding Tianhong <dingtianhong@...wei.com>
Cc:	Jay Vosburgh <fubar@...ibm.com>,
	"David S. Miller" <davem@...emloft.net>,
	Netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next 1/3] bonding: update the primary slave when
 slave's name changed

On Tue, Jan 14, 2014 at 10:36:56AM +0800, Ding Tianhong wrote:
>If the slave's name changed, and the bond params primary is exist,
>the bond should deal with the situation in two ways:
>
>1) If the slave is the primary slave yet, clean the primary slave
>   and reselect active slave.
>2) If the slave's new name is as same as bond primary, set the slave
>   as primary slave and reselect active slave.
>
>Thanks for Veaceslav's suggestion.
>
>Suggested-by: Veaceslav Falico <vfalico@...hat.com>

As in my previous email - please, don't use my name until I say so.

I'll add my signed-off-by to any patch that I've worked enough on.

>Signed-off-by: Ding Tianhong <dingtianhong@...wei.com>
>---
> drivers/net/bonding/bond_main.c | 30 ++++++++++++++++++++++++++++--
> 1 file changed, 28 insertions(+), 2 deletions(-)
>
>diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
>index e06c445..63d6533 100644
>--- a/drivers/net/bonding/bond_main.c
>+++ b/drivers/net/bonding/bond_main.c
>@@ -2860,9 +2860,35 @@ static int bond_slave_netdev_event(unsigned long event,
> 		 */
> 		break;
> 	case NETDEV_CHANGENAME:
>-		/*
>-		 * TODO: handle changing the primary's name
>+		/* Handle changing the slave's name:
>+		 * 1) If the slave is primary save yet,
>+		 * clean the primary slave and reselect
>+		 * active slave.

I usually don't mind bad english (as I myself am speaking quite horrible
one), but I can't really understand what you've meant here. And given that
it's a comment in code - please, proof-read it first.

>+		 * 2) If the slave's new name is bond
>+		 * primary, set the slave as primary
>+		 * slave and reselect active slave.
> 		 */
>+		if (USES_PRIMARY(bond->params.mode) &&
>+		    bond->params.primary[0]) {

Too many indentions. Verify if we're not using primary or primary string
name is null and break, otherwise go further.

>+			if (bond->primary_slave &&
>+			    slave == bond->primary_slave) {

Useless verification, slave can't be NULL.

>+				pr_info("%s: Setting primary slave to None.\n",
>+					bond->dev->name);
>+				bond->primary_slave = NULL;
>+				write_lock_bh(&bond->curr_slave_lock);
>+				bond_select_active_slave(bond);

Get bond_select_active_slave() out of if()s, you use it twice here.

>+				write_unlock_bh(&bond->curr_slave_lock);
>+			} else if (!bond->primary_slave &&

Useless verification, if the name of a slave changed to our params.primary
- then it means that bond->primary_slave was NULL, as it can only be
not-null when we have a matching interface, and that would mean that we
have two interfaces with the same name.

>+				   !strcmp(bond->params.primary,
>+					  slave_dev->name)) {
>+				pr_info("%s: Setting %s as primary slave.\n",
>+					bond->dev->name, slave_dev->name);
>+				bond->primary_slave = slave;
>+				write_lock_bh(&bond->curr_slave_lock);
>+				bond_select_active_slave(bond);
>+				write_unlock_bh(&bond->curr_slave_lock);
>+			}
>+		}
> 		break;
> 	case NETDEV_FEAT_CHANGE:
> 		bond_compute_features(bond);
>-- 
>1.8.0
>
>
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