Re: [patch net-next v3 05/17] rtnl: expose physical switch id for particular device

Andy Gospodarek
2014-11-25T15:17:11Z

On Tue, Nov 25, 2014 at 11:28:36AM +0100, Jiri Pirko wrote:
> The netdevice represents a port in a switch, it will expose
> IFLA_PHYS_SWITCH_ID value via rtnl. Two netdevices with the same value
> belong to one physical switch.
>
> Signed-off-by: Jiri Pirko <jiri@resnulli.us>
> Reviewed-by: Thomas Graf <tgraf@suug.ch>
> Acked-by: John Fastabend <john.r.fastabend@intel.com>

Acked-by: Andy Gospodarek <gospo@cumulusnetworks.com>

> ---
> v2->v3:
> -changed "sw" string to "switch" to avoid confusion
> v1->v2:
> -no change
> ---
> include/uapi/linux/if_link.h | 1 +
> net/core/rtnetlink.c | 26 +++++++++++++++++++++++++-
> 2 files changed, 26 insertions(+), 1 deletion(-)
>
> diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h
> index 7072d83..4163753 100644
> --- a/include/uapi/linux/if_link.h
> +++ b/include/uapi/linux/if_link.h
> @@ -145,6 +145,7 @@ enum {
> IFLA_CARRIER,
> IFLA_PHYS_PORT_ID,
> IFLA_CARRIER_CHANGES,
> + IFLA_PHYS_SWITCH_ID,
> __IFLA_MAX
> };
>
> diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
> index 0fb3a68..bd5e783 100644
> --- a/net/core/rtnetlink.c
> +++ b/net/core/rtnetlink.c
> @@ -44,6 +44,7 @@
>
> #include <linux/inet.h>
> #include <linux/netdevice.h>
> +#include <net/switchdev.h>
> #include <net/ip.h>
> #include <net/protocol.h>
> #include <net/arp.h>
> @@ -869,7 +870,8 @@ static noinline size_t if_nlmsg_size(const struct net_device *dev,
> + rtnl_port_size(dev, ext_filter_mask) /* IFLA_VF_PORTS + IFLA_PORT_SELF */
> + rtnl_link_get_size(dev) /* IFLA_LINKINFO */
> + rtnl_link_get_af_size(dev) /* IFLA_AF_SPEC */
> - + nla_total_size(MAX_PHYS_ITEM_ID_LEN); /* IFLA_PHYS_PORT_ID */
> + + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_PORT_ID */
> + + nla_total_size(MAX_PHYS_ITEM_ID_LEN); /* IFLA_PHYS_SWITCH_ID */
> }
>
> static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev)
> @@ -968,6 +970,24 @@ static int rtnl_phys_port_id_fill(struct sk_buff *skb, struct net_device *dev)
> return 0;
> }
>
> +static int rtnl_phys_switch_id_fill(struct sk_buff *skb, struct net_device *dev)
> +{
> + int err;
> + struct netdev_phys_item_id psid;
> +
> + err = netdev_switch_parent_id_get(dev, &psid);
> + if (err) {
> + if (err == -EOPNOTSUPP)
> + return 0;
> + return err;
> + }
> +
> + if (nla_put(skb, IFLA_PHYS_SWITCH_ID, psid.id_len, psid.id))
> + return -EMSGSIZE;
> +
> + return 0;
> +}
> +
> static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
> int type, u32 pid, u32 seq, u32 change,
> unsigned int flags, u32 ext_filter_mask)
> @@ -1040,6 +1060,9 @@ static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
> if (rtnl_phys_port_id_fill(skb, dev))
> goto nla_put_failure;
>
> + if (rtnl_phys_switch_id_fill(skb, dev))
> + goto nla_put_failure;
> +
> attr = nla_reserve(skb, IFLA_STATS,
> sizeof(struct rtnl_link_stats));
> if (attr == NULL)
> @@ -1199,6 +1222,7 @@ static const struct nla_policy ifla_policy[IFLA_MAX+1] = {
> [IFLA_NUM_RX_QUEUES] = { .type = NLA_U32 },
> [IFLA_PHYS_PORT_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
> [IFLA_CARRIER_CHANGES] = { .type = NLA_U32 }, /* ignored */
> + [IFLA_PHYS_SWITCH_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
> };
>
> static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
> --
> 1.9.3
>
> --
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