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From: Jiri Pirko <jpirko@redhat.com>
Date: Fri, 20 Apr 2012 04:42:05 +0000
Subject: [22/23] team: allow to enable/disable ports
commit 19a0b58e506b06fd41659d8734bba6a3e87980f4 upstream.
This patch changes content of hashlist (used to get port struct by
computed index (0...en_port_count-1)). Now the hash list contains only
enabled ports so userspace will be able to say what ports can be used
for tx/rx. This becomes handy when userspace will need to disable ports
which does not belong to active aggregator. By default, newly added port
is enabled.
Signed-off-by: Jiri Pirko <jpirko@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
drivers/net/team/team.c | 51 ++++++++++++++++++++----------
drivers/net/team/team_mode_loadbalance.c | 2 +-
drivers/net/team/team_mode_roundrobin.c | 2 +-
include/linux/if_team.h | 15 +++++----
4 files changed, 45 insertions(+), 25 deletions(-)
diff --git a/drivers/net/team/team.c b/drivers/net/team/team.c
index 153a62d..fe7ca40 100644
--- a/drivers/net/team/team.c
+++ b/drivers/net/team/team.c
@@ -559,6 +559,8 @@ static int team_change_mode(struct team *team, const char *kind)
* Rx path frame handler
************************/
+static bool team_port_enabled(struct team_port *port);
+
/* note: already called with rcu_read_lock */
static rx_handler_result_t team_handle_frame(struct sk_buff **pskb)
{
@@ -575,8 +577,12 @@ static rx_handler_result_t team_handle_frame(struct sk_buff **pskb)
port = team_port_get_rcu(skb->dev);
team = port->team;
-
- res = team->ops.receive(team, port, skb);
+ if (!team_port_enabled(port)) {
+ /* allow exact match delivery for disabled ports */
+ res = RX_HANDLER_EXACT;
+ } else {
+ res = team->ops.receive(team, port, skb);
+ }
if (res == RX_HANDLER_ANOTHER) {
struct team_pcpu_stats *pcpu_stats;
@@ -612,17 +618,25 @@ static bool team_port_find(const struct team *team,
return false;
}
+static bool team_port_enabled(struct team_port *port)
+{
+ return port->index != -1;
+}
+
/*
- * Add/delete port to the team port list. Write guarded by rtnl_lock.
- * Takes care of correct port->index setup (might be racy).
+ * Enable/disable port by adding to enabled port hashlist and setting
+ * port->index (Might be racy so reader could see incorrect ifindex when
+ * processing a flying packet, but that is not a problem). Write guarded
+ * by team->lock.
*/
-static void team_port_list_add_port(struct team *team,
- struct team_port *port)
+static void team_port_enable(struct team *team,
+ struct team_port *port)
{
- port->index = team->port_count++;
+ if (team_port_enabled(port))
+ return;
+ port->index = team->en_port_count++;
hlist_add_head_rcu(&port->hlist,
team_port_index_hash(team, port->index));
- list_add_tail_rcu(&port->list, &team->port_list);
}
static void __reconstruct_port_hlist(struct team *team, int rm_index)
@@ -630,7 +644,7 @@ static void __reconstruct_port_hlist(struct team *team, int rm_index)
int i;
struct team_port *port;
- for (i = rm_index + 1; i < team->port_count; i++) {
+ for (i = rm_index + 1; i < team->en_port_count; i++) {
port = team_get_port_by_index(team, i);
hlist_del_rcu(&port->hlist);
port->index--;
@@ -639,15 +653,17 @@ static void __reconstruct_port_hlist(struct team *team, int rm_index)
}
}
-static void team_port_list_del_port(struct team *team,
- struct team_port *port)
+static void team_port_disable(struct team *team,
+ struct team_port *port)
{
int rm_index = port->index;
+ if (!team_port_enabled(port))
+ return;
hlist_del_rcu(&port->hlist);
- list_del_rcu(&port->list);
__reconstruct_port_hlist(team, rm_index);
- team->port_count--;
+ team->en_port_count--;
+ port->index = -1;
}
#define TEAM_VLAN_FEATURES (NETIF_F_ALL_CSUM | NETIF_F_SG | \
@@ -800,7 +816,9 @@ static int team_port_add(struct team *team, struct net_device *port_dev)
goto err_option_port_add;
}
- team_port_list_add_port(team, port);
+ port->index = -1;
+ team_port_enable(team, port);
+ list_add_tail_rcu(&port->list, &team->port_list);
team_adjust_ops(team);
__team_compute_features(team);
__team_port_change_check(port, !!netif_carrier_ok(port_dev));
@@ -849,7 +867,8 @@ static int team_port_del(struct team *team, struct net_device *port_dev)
port->removed = true;
__team_port_change_check(port, false);
- team_port_list_del_port(team, port);
+ team_port_disable(team, port);
+ list_del_rcu(&port->list);
team_adjust_ops(team);
team_option_port_del(team, port);
netdev_rx_handler_unregister(port_dev);
@@ -956,7 +975,7 @@ static int team_init(struct net_device *dev)
return -ENOMEM;
for (i = 0; i < TEAM_PORT_HASHENTRIES; i++)
- INIT_HLIST_HEAD(&team->port_hlist[i]);
+ INIT_HLIST_HEAD(&team->en_port_hlist[i]);
INIT_LIST_HEAD(&team->port_list);
team_adjust_ops(team);
diff --git a/drivers/net/team/team_mode_loadbalance.c b/drivers/net/team/team_mode_loadbalance.c
index 438d5b8..86e8183 100644
--- a/drivers/net/team/team_mode_loadbalance.c
+++ b/drivers/net/team/team_mode_loadbalance.c
@@ -38,7 +38,7 @@ static bool lb_transmit(struct team *team, struct sk_buff *skb)
if (unlikely(!fp))
goto drop;
hash = SK_RUN_FILTER(fp, skb);
- port_index = hash % team->port_count;
+ port_index = hash % team->en_port_count;
port = team_get_port_by_index_rcu(team, port_index);
if (unlikely(!port))
goto drop;
diff --git a/drivers/net/team/team_mode_roundrobin.c b/drivers/net/team/team_mode_roundrobin.c
index a0e8f80..6abfbdc 100644
--- a/drivers/net/team/team_mode_roundrobin.c
+++ b/drivers/net/team/team_mode_roundrobin.c
@@ -50,7 +50,7 @@ static bool rr_transmit(struct team *team, struct sk_buff *skb)
struct team_port *port;
int port_index;
- port_index = rr_priv(team)->sent_packets++ % team->port_count;
+ port_index = rr_priv(team)->sent_packets++ % team->en_port_count;
port = team_get_port_by_index_rcu(team, port_index);
port = __get_first_port_up(team, port);
if (unlikely(!port))
diff --git a/include/linux/if_team.h b/include/linux/if_team.h
index 5fd5ab1..8185f57 100644
--- a/include/linux/if_team.h
+++ b/include/linux/if_team.h
@@ -28,10 +28,10 @@ struct team;
struct team_port {
struct net_device *dev;
- struct hlist_node hlist; /* node in hash list */
+ struct hlist_node hlist; /* node in enabled ports hash list */
struct list_head list; /* node in ordinary list */
struct team *team;
- int index;
+ int index; /* index of enabled port. If disabled, it's set to -1 */
bool linkup; /* either state.linkup or user.linkup */
@@ -125,11 +125,12 @@ struct team {
struct mutex lock; /* used for overall locking, e.g. port lists write */
/*
- * port lists with port count
+ * List of enabled ports and their count
*/
- int port_count;
- struct hlist_head port_hlist[TEAM_PORT_HASHENTRIES];
- struct list_head port_list;
+ int en_port_count;
+ struct hlist_head en_port_hlist[TEAM_PORT_HASHENTRIES];
+
+ struct list_head port_list; /* list of all ports */
struct list_head option_list;
struct list_head option_inst_list; /* list of option instances */
@@ -142,7 +143,7 @@ struct team {
static inline struct hlist_head *team_port_index_hash(struct team *team,
int port_index)
{
- return &team->port_hlist[port_index & (TEAM_PORT_HASHENTRIES - 1)];
+ return &team->en_port_hlist[port_index & (TEAM_PORT_HASHENTRIES - 1)];
}
static inline struct team_port *team_get_port_by_index(struct team *team,
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