netdev - Re: [PATCH v2] bonding: "primary_reselect" with "failure" is not working properly

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Date:	Mon, 6 Jul 2015 11:32:21 -0400
From:	Andy Gospodarek <gospo@...ulusnetworks.com>
To:	GMAIL <ranamazharp@...il.com>
Cc:	Jay Vosburgh <jay.vosburgh@...onical.com>, netdev@...r.kernel.org,
	vfalico@...il.com, davem@...emloft.net, sanket.shah@...eroam.com,
	mazhar.rana@...eroam.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] bonding: "primary_reselect" with "failure" is not
 working properly

On Mon, Jul 06, 2015 at 05:34:01PM +0530, GMAIL wrote:
> On Friday 03 July 2015 11:46 PM, Jay Vosburgh wrote:
> >GMAIL <ranamazharp@...il.com> wrote:
[...]
> 
> Looks good, added cosmetic changes for more readability,
> it might save some instructions :)
> 
> 
> diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
> index 19eb990..317a494 100644
> --- a/drivers/net/bonding/bond_main.c
> +++ b/drivers/net/bonding/bond_main.c
> @@ -689,40 +689,57 @@ out:
>  }
> -static bool bond_should_change_active(struct bonding *bond)
> +static struct slave *bond_choose_primary_or_current(struct bonding *bond)
>  {
>         struct slave *prim = rtnl_dereference(bond->primary_slave);
>         struct slave *curr = rtnl_dereference(bond->curr_active_slave);
Probably a good idea to add back a blank line here.

Otherwise this logic appears to be proper to resolve your issue and
Jay's additions appear to handle the case where primary_slave is NULL.

> -       if (!prim || !curr || curr->link != BOND_LINK_UP)
> -               return true;
> +       if (!prim || prim->link != BOND_LINK_UP) {
> +               if (!curr || curr->link != BOND_LINK_UP)
> +                       return NULL;
> +               return curr;
> +       }
> +
>         if (bond->force_primary) {
>                 bond->force_primary = false;
> -               return true;
> +               return prim;
> +       }
> +
> +       if (!curr || curr->link != BOND_LINK_UP)
> +               return prim;
> +
> +       /* At this point, prim and curr are both up */
> +       switch (bond->params.primary_reselect) {
> +       case BOND_PRI_RESELECT_ALWAYS:
> +               return prim;
> +       case BOND_PRI_RESELECT_BETTER:
> +               if (prim->speed < curr->speed)
> +                       return curr;
> +               if (prim->speed == curr->speed && prim->duplex <= curr->duplex)
> +                       return curr;
> +               return prim;
> +       case BOND_PRI_RESELECT_FAILURE:
> +               return curr;
> +       default:
> +               netdev_err(bond->dev, "impossible primary_reselect %d\n",
> +                          bond->params.primary_reselect);
> +               return curr;
>         }
> -       if (bond->params.primary_reselect == BOND_PRI_RESELECT_BETTER &&
> -           (prim->speed < curr->speed ||
> -            (prim->speed == curr->speed && prim->duplex <= curr->duplex)))
> -               return false;
> -       if (bond->params.primary_reselect == BOND_PRI_RESELECT_FAILURE)
> -               return false;
> -       return true;
>  }
> 
>  /**
> - * find_best_interface - select the best available slave to be the active one
> + * bond_find_best_slave - select the best available slave to be the active one
>   * @bond: our bonding struct
>   */
>  static struct slave *bond_find_best_slave(struct bonding *bond)
>  {
> -       struct slave *slave, *bestslave = NULL, *primary;
> +       struct slave *slave, *bestslave = NULL;
>         struct list_head *iter;
>         int mintime = bond->params.updelay;
> 
> -       primary = rtnl_dereference(bond->primary_slave);
> -       if (primary && primary->link == BOND_LINK_UP &&
> -           bond_should_change_active(bond))
> -               return primary;
> +       slave = bond_choose_primary_or_current(bond);
> +       if (slave)
> +               return slave;
> 
>         bond_for_each_slave(bond, slave, iter) {
>                 if (slave->link == BOND_LINK_UP)
> ---
> 
> Regards,
> Mazhar Rana
> 
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