netdev - Re: [patch net-next 2/7] ipv4: ipmr: Add the parent ID field to VIF struct

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Message-ID: <7618b2e8-e7f9-d2c6-b13c-53aef0f50de0@cumulusnetworks.com>
Date:   Fri, 29 Sep 2017 12:29:05 +0300
From:   Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
To:     Jiri Pirko <jiri@...nulli.us>, netdev@...r.kernel.org
Cc:     davem@...emloft.net, yotamg@...lanox.com, idosch@...lanox.com,
        mlxsw@...lanox.com, andrew@...n.ch, dsa@...ulusnetworks.com,
        edumazet@...gle.com, willemb@...gle.com, johannes.berg@...el.com,
        dcaratti@...hat.com, pabeni@...hat.com, daniel@...earbox.net,
        f.fainelli@...il.com, fw@...len.de, gfree.wind@....163.com
Subject: Re: [patch net-next 2/7] ipv4: ipmr: Add the parent ID field to VIF
 struct

On 28/09/17 20:34, Jiri Pirko wrote:
> From: Yotam Gigi <yotamg@...lanox.com>
> 
> In order to allow the ipmr module to do partial multicast forwarding
> according to the device parent ID, add the device parent ID field to the
> VIF struct. This way, the forwarding path can use the parent ID field
> without invoking switchdev calls, which requires the RTNL lock.
> 
> When a new VIF is added, set the device parent ID field in it by invoking
> the switchdev_port_attr_get call.
> 
> Signed-off-by: Yotam Gigi <yotamg@...lanox.com>
> Reviewed-by: Ido Schimmel <idosch@...lanox.com>
> Signed-off-by: Jiri Pirko <jiri@...lanox.com>
> ---
>  include/linux/mroute.h | 2 ++
>  net/ipv4/ipmr.c        | 9 +++++++++
>  2 files changed, 11 insertions(+)
> 
> diff --git a/include/linux/mroute.h b/include/linux/mroute.h
> index b072a84..a46577f 100644
> --- a/include/linux/mroute.h
> +++ b/include/linux/mroute.h
> @@ -57,6 +57,8 @@ static inline bool ipmr_rule_default(const struct fib_rule *rule)
>  
>  struct vif_device {
>  	struct net_device 	*dev;			/* Device we are using */
> +	struct netdev_phys_item_id dev_parent_id;	/* Device parent ID    */
> +	bool		dev_parent_id_valid;
>  	unsigned long	bytes_in,bytes_out;
>  	unsigned long	pkt_in,pkt_out;		/* Statistics 			*/
>  	unsigned long	rate_limit;		/* Traffic shaping (NI) 	*/
> diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c
> index 292a8e8..4566c54 100644
> --- a/net/ipv4/ipmr.c
> +++ b/net/ipv4/ipmr.c
> @@ -67,6 +67,7 @@
>  #include <net/fib_rules.h>
>  #include <linux/netconf.h>
>  #include <net/nexthop.h>
> +#include <net/switchdev.h>
>  
>  struct ipmr_rule {
>  	struct fib_rule		common;
> @@ -868,6 +869,9 @@ static int vif_add(struct net *net, struct mr_table *mrt,
>  		   struct vifctl *vifc, int mrtsock)
>  {
>  	int vifi = vifc->vifc_vifi;
> +	struct switchdev_attr attr = {
> +		.id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID,
> +	};
>  	struct vif_device *v = &mrt->vif_table[vifi];
>  	struct net_device *dev;
>  	struct in_device *in_dev;
> @@ -942,6 +946,11 @@ static int vif_add(struct net *net, struct mr_table *mrt,
>  
>  	/* Fill in the VIF structures */
>  
> +	attr.orig_dev = dev;
> +	if (!switchdev_port_attr_get(dev, &attr)) {
> +		v->dev_parent_id_valid = true;
> +		memcpy(v->dev_parent_id.id, attr.u.ppid.id, attr.u.ppid.id_len);

Hmm, shouldn't you set dev_parent_id.id_len too ? It would seem netdev_phys_item_id_same()
uses it in the comparison and without the len it would always look like they're the same
because memcmp will simply return 0 with count = 0.

> +	}
>  	v->rate_limit = vifc->vifc_rate_limit;
>  	v->local = vifc->vifc_lcl_addr.s_addr;
>  	v->remote = vifc->vifc_rmt_addr.s_addr;
>