netdev - Re: [PATCH 2/3] bridge: offload bridge port attributes to switch asic if feature flag set

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Date:	Fri, 05 Dec 2014 16:21:48 +0300
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	roopa@...ulusnetworks.com, jiri@...nulli.us, sfeldma@...il.com,
	jhs@...atatu.com, bcrl@...ck.org, tgraf@...g.ch,
	john.fastabend@...il.com, stephen@...workplumber.org,
	linville@...driver.com, nhorman@...driver.com,
	nicolas.dichtel@...nd.com, vyasevic@...hat.com,
	f.fainelli@...il.com, buytenh@...tstofly.org, aviadr@...lanox.com
CC:	netdev@...r.kernel.org, davem@...emloft.net,
	shm@...ulusnetworks.com, gospo@...ulusnetworks.com
Subject: Re: [PATCH 2/3] bridge: offload bridge port attributes to switch
 asic if feature flag set

Hello.

On 12/5/2014 5:26 AM, roopa@...ulusnetworks.com wrote:

> From: Roopa Prabhu <roopa@...ulusnetworks.com>

> This allows offloading to switch asic without having the user to set
> any flag. And this is done in the bridge driver to rollback kernel settings
> on hw offload failure if required in the future.

> With this, it also makes sure a notification goes out only after the
> attributes are set both in the kernel and hw.
> ---
>   net/bridge/br_netlink.c |   27 ++++++++++++++++++++++++++-
>   1 file changed, 26 insertions(+), 1 deletion(-)

> diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
> index 9f5eb55..ce173f0 100644
> --- a/net/bridge/br_netlink.c
> +++ b/net/bridge/br_netlink.c
> @@ -407,9 +407,21 @@ int br_setlink(struct net_device *dev, struct nlmsghdr *nlh)
>   				afspec, RTM_SETLINK);
>   	}
>
> +	if ((dev->features & NETIF_F_HW_SWITCH_OFFLOAD) &&
> +			dev->netdev_ops->ndo_bridge_setlink) {
> +		int ret = dev->netdev_ops->ndo_bridge_setlink(dev, nlh);

    Need empty line after declaration.

> +		if (ret && ret != -EOPNOTSUPP) {
> +			/* XXX Fix this in the future to rollback
> +			 * kernel settings and return error
> +			 */
> +			br_warn(p->br, "error offloading bridge attributes "
> +					"on port %u(%s)\n", (unsigned int) p->port_no,

    Don't break up the message strings. Also, your continuation lines should 
start under the next character after ( on the first line.

> +					p->dev->name);
> +		}
> +	}
> +
>   	if (err == 0)
>   		br_ifinfo_notify(RTM_NEWLINK, p);
> -

    Why?

>   out:
>   	return err;
>   }
> @@ -433,6 +445,19 @@ int br_dellink(struct net_device *dev, struct nlmsghdr *nlh)
>   	err = br_afspec((struct net_bridge *)netdev_priv(dev), p,
>   			afspec, RTM_DELLINK);
>
> +	if (dev->features & NETIF_F_HW_SWITCH_OFFLOAD
> +			&& dev->netdev_ops->ndo_bridge_setlink) {
> +		int ret = dev->netdev_ops->ndo_bridge_dellink(dev, nlh);
> +		if (ret && ret != -EOPNOTSUPP) {
> +			/* XXX Fix this in the future to rollback
> +			 * kernel settings and return error
> +			 */
> +			br_warn(p->br, "error offloading bridge attributes "
> +					"on port %u(%s)\n", (unsigned int) p->port_no,
> +					p->dev->name);

    Same comments here.

> +		}
> +	}
> +
>   	return err;
>   }
>   static int br_validate(struct nlattr *tb[], struct nlattr *data[])

WBR, Sergei

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