On Wed, Dec 02, 2020 at 10:13:54AM +0100, Tobias Waldekranz wrote:
> Monitor the following events and notify the driver when:
>
> - A DSA port joins/leaves a LAG.
> - A LAG, made up of DSA ports, joins/leaves a bridge.
> - A DSA port in a LAG is enabled/disabled (enabled meaning
> "distributing" in 802.3ad LACP terms).
>
> Each LAG interface to which a DSA port is attached is represented by a
> `struct dsa_lag` which is globally reachable from the switch tree and
> from each associated port.
>
> When a LAG joins a bridge, the DSA subsystem will treat that as each
> individual port joining the bridge. The driver may look at the port's
> LAG pointer to see if it is associated with any LAG, if that is
> required. This is analogue to how switchdev events are replicated out
> to all lower devices when reaching e.g. a LAG.
>
> Signed-off-by: Tobias Waldekranz <tob...@waldekranz.com>
> ---
> include/net/dsa.h | 97 +++++++++++++++++++++++++++++++++
> net/dsa/dsa2.c | 51 ++++++++++++++++++
> net/dsa/dsa_priv.h | 31 +++++++++++
> net/dsa/port.c | 132 +++++++++++++++++++++++++++++++++++++++++++++
> net/dsa/slave.c | 83 +++++++++++++++++++++++++---
> net/dsa/switch.c | 49 +++++++++++++++++
> 6 files changed, 437 insertions(+), 6 deletions(-)
>
> diff --git a/include/net/dsa.h b/include/net/dsa.h
> index 4e60d2610f20..aaa350b78c55 100644
> --- a/include/net/dsa.h
> +++ b/include/net/dsa.h
> @@ -7,6 +7,7 @@
> #ifndef __LINUX_NET_DSA_H
> #define __LINUX_NET_DSA_H
>
> +#include <linux/bitmap.h>
> #include <linux/if.h>
> #include <linux/if_ether.h>
> #include <linux/list.h>
> @@ -71,6 +72,7 @@ enum dsa_tag_protocol {
>
> struct packet_type;
> struct dsa_switch;
> +struct dsa_lag;
>
> struct dsa_device_ops {
> struct sk_buff *(*xmit)(struct sk_buff *skb, struct net_device *dev);
> @@ -149,6 +151,13 @@ struct dsa_switch_tree {
>
> /* List of DSA links composing the routing table */
> struct list_head rtable;
> +
> + /* Link aggregates */
> + struct {
> + struct dsa_lag *pool;
> + unsigned long *busy;
> + unsigned int num;
Can we get rid of the busy array and just look at the refcounts?
Can we also get rid of the "num" variable?
> + } lags;
> };
