team: introduce random mode

As suggested by Eric Dumazet, allow user to select mode which chooses
TX port randomly. Functionality should be more of less similar to
round-robin mode with even lower overhead.

Signed-off-by: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 20 insertions, 0 deletions

diff --git a/include/linux/if_team.h b/include/linux/if_team.h
index 3283def74483..4474557904f6 100644
--- a/include/linux/if_team.h
+++ b/include/linux/if_team.h
@@ -240,6 +240,26 @@ static inline struct team_port *team_get_port_by_index_rcu(struct team *team,
         return NULL;
 }
 
+static inline struct team_port *
+team_get_first_port_txable_rcu(struct team *team, struct team_port *port)
+{
+        struct team_port *cur;
+
+        if (likely(team_port_txable(port)))
+                return port;
+        cur = port;
+        list_for_each_entry_continue_rcu(cur, &team->port_list, list)
+                if (team_port_txable(port))
+                        return cur;
+        list_for_each_entry_rcu(cur, &team->port_list, list) {
+                if (cur == port)
+                        break;
+                if (team_port_txable(port))
+                        return cur;
+        }
+        return NULL;
+}
+
 extern int team_options_register(struct team *team,
                                  const struct team_option *option,
                                  size_t option_count);